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Merge tag 'uml-for-linus-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / drivers / net / virtio_net.c
blob7646ddd9bef70cf2a0833c7db7c0491884fb7ab5
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* A network driver using virtio.
3 *
4 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
5 */
6 //#define DEBUG
7 #include <linux/netdevice.h>
8 #include <linux/etherdevice.h>
9 #include <linux/ethtool.h>
10 #include <linux/module.h>
11 #include <linux/virtio.h>
12 #include <linux/virtio_net.h>
13 #include <linux/bpf.h>
14 #include <linux/bpf_trace.h>
15 #include <linux/scatterlist.h>
16 #include <linux/if_vlan.h>
17 #include <linux/slab.h>
18 #include <linux/cpu.h>
19 #include <linux/average.h>
20 #include <linux/filter.h>
21 #include <linux/kernel.h>
22 #include <linux/dim.h>
23 #include <net/route.h>
24 #include <net/xdp.h>
25 #include <net/net_failover.h>
26 #include <net/netdev_rx_queue.h>
27 #include <net/netdev_queues.h>
28 #include <net/xdp_sock_drv.h>
29
30 static int napi_weight = NAPI_POLL_WEIGHT;
31 module_param(napi_weight, int, 0444);
32
33 static bool csum = true, gso = true, napi_tx = true;
34 module_param(csum, bool, 0444);
35 module_param(gso, bool, 0444);
36 module_param(napi_tx, bool, 0644);
37
38 /* FIXME: MTU in config. */
39 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
40 #define GOOD_COPY_LEN 128
41
42 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
43
44 /* Separating two types of XDP xmit */
45 #define VIRTIO_XDP_TX BIT(0)
46 #define VIRTIO_XDP_REDIR BIT(1)
47
48 /* RX packet size EWMA. The average packet size is used to determine the packet
49 * buffer size when refilling RX rings. As the entire RX ring may be refilled
50 * at once, the weight is chosen so that the EWMA will be insensitive to short-
51 * term, transient changes in packet size.
52 */
53 DECLARE_EWMA(pkt_len, 0, 64)
54
55 #define VIRTNET_DRIVER_VERSION "1.0.0"
56
57 static const unsigned long guest_offloads[] = {
58 VIRTIO_NET_F_GUEST_TSO4,
59 VIRTIO_NET_F_GUEST_TSO6,
60 VIRTIO_NET_F_GUEST_ECN,
61 VIRTIO_NET_F_GUEST_UFO,
62 VIRTIO_NET_F_GUEST_CSUM,
63 VIRTIO_NET_F_GUEST_USO4,
64 VIRTIO_NET_F_GUEST_USO6,
65 VIRTIO_NET_F_GUEST_HDRLEN
66 };
67
68 #define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
69 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
70 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
71 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \
72 (1ULL << VIRTIO_NET_F_GUEST_USO4) | \
73 (1ULL << VIRTIO_NET_F_GUEST_USO6))
74
75 struct virtnet_stat_desc {
76 char desc[ETH_GSTRING_LEN];
77 size_t offset;
78 size_t qstat_offset;
79 };
80
81 struct virtnet_sq_free_stats {
82 u64 packets;
83 u64 bytes;
84 u64 napi_packets;
85 u64 napi_bytes;
86 u64 xsk;
87 };
88
89 struct virtnet_sq_stats {
90 struct u64_stats_sync syncp;
91 u64_stats_t packets;
92 u64_stats_t bytes;
93 u64_stats_t xdp_tx;
94 u64_stats_t xdp_tx_drops;
95 u64_stats_t kicks;
96 u64_stats_t tx_timeouts;
97 u64_stats_t stop;
98 u64_stats_t wake;
99 };
100
101 struct virtnet_rq_stats {
102 struct u64_stats_sync syncp;
103 u64_stats_t packets;
104 u64_stats_t bytes;
105 u64_stats_t drops;
106 u64_stats_t xdp_packets;
107 u64_stats_t xdp_tx;
108 u64_stats_t xdp_redirects;
109 u64_stats_t xdp_drops;
110 u64_stats_t kicks;
111 };
112
113 #define VIRTNET_SQ_STAT(name, m) {name, offsetof(struct virtnet_sq_stats, m), -1}
114 #define VIRTNET_RQ_STAT(name, m) {name, offsetof(struct virtnet_rq_stats, m), -1}
115
116 #define VIRTNET_SQ_STAT_QSTAT(name, m) \
117 { \
118 name, \
119 offsetof(struct virtnet_sq_stats, m), \
120 offsetof(struct netdev_queue_stats_tx, m), \
121 }
122
123 #define VIRTNET_RQ_STAT_QSTAT(name, m) \
124 { \
125 name, \
126 offsetof(struct virtnet_rq_stats, m), \
127 offsetof(struct netdev_queue_stats_rx, m), \
128 }
129
130 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
131 VIRTNET_SQ_STAT("xdp_tx", xdp_tx),
132 VIRTNET_SQ_STAT("xdp_tx_drops", xdp_tx_drops),
133 VIRTNET_SQ_STAT("kicks", kicks),
134 VIRTNET_SQ_STAT("tx_timeouts", tx_timeouts),
135 };
136
137 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
138 VIRTNET_RQ_STAT("drops", drops),
139 VIRTNET_RQ_STAT("xdp_packets", xdp_packets),
140 VIRTNET_RQ_STAT("xdp_tx", xdp_tx),
141 VIRTNET_RQ_STAT("xdp_redirects", xdp_redirects),
142 VIRTNET_RQ_STAT("xdp_drops", xdp_drops),
143 VIRTNET_RQ_STAT("kicks", kicks),
144 };
145
146 static const struct virtnet_stat_desc virtnet_sq_stats_desc_qstat[] = {
147 VIRTNET_SQ_STAT_QSTAT("packets", packets),
148 VIRTNET_SQ_STAT_QSTAT("bytes", bytes),
149 VIRTNET_SQ_STAT_QSTAT("stop", stop),
150 VIRTNET_SQ_STAT_QSTAT("wake", wake),
151 };
152
153 static const struct virtnet_stat_desc virtnet_rq_stats_desc_qstat[] = {
154 VIRTNET_RQ_STAT_QSTAT("packets", packets),
155 VIRTNET_RQ_STAT_QSTAT("bytes", bytes),
156 };
157
158 #define VIRTNET_STATS_DESC_CQ(name) \
159 {#name, offsetof(struct virtio_net_stats_cvq, name), -1}
160
161 #define VIRTNET_STATS_DESC_RX(class, name) \
162 {#name, offsetof(struct virtio_net_stats_rx_ ## class, rx_ ## name), -1}
163
164 #define VIRTNET_STATS_DESC_TX(class, name) \
165 {#name, offsetof(struct virtio_net_stats_tx_ ## class, tx_ ## name), -1}
166
167
168 static const struct virtnet_stat_desc virtnet_stats_cvq_desc[] = {
169 VIRTNET_STATS_DESC_CQ(command_num),
170 VIRTNET_STATS_DESC_CQ(ok_num),
171 };
172
173 static const struct virtnet_stat_desc virtnet_stats_rx_basic_desc[] = {
174 VIRTNET_STATS_DESC_RX(basic, packets),
175 VIRTNET_STATS_DESC_RX(basic, bytes),
176
177 VIRTNET_STATS_DESC_RX(basic, notifications),
178 VIRTNET_STATS_DESC_RX(basic, interrupts),
179 };
180
181 static const struct virtnet_stat_desc virtnet_stats_tx_basic_desc[] = {
182 VIRTNET_STATS_DESC_TX(basic, packets),
183 VIRTNET_STATS_DESC_TX(basic, bytes),
184
185 VIRTNET_STATS_DESC_TX(basic, notifications),
186 VIRTNET_STATS_DESC_TX(basic, interrupts),
187 };
188
189 static const struct virtnet_stat_desc virtnet_stats_rx_csum_desc[] = {
190 VIRTNET_STATS_DESC_RX(csum, needs_csum),
191 };
192
193 static const struct virtnet_stat_desc virtnet_stats_tx_gso_desc[] = {
194 VIRTNET_STATS_DESC_TX(gso, gso_packets_noseg),
195 VIRTNET_STATS_DESC_TX(gso, gso_bytes_noseg),
196 };
197
198 static const struct virtnet_stat_desc virtnet_stats_rx_speed_desc[] = {
199 VIRTNET_STATS_DESC_RX(speed, ratelimit_bytes),
200 };
201
202 static const struct virtnet_stat_desc virtnet_stats_tx_speed_desc[] = {
203 VIRTNET_STATS_DESC_TX(speed, ratelimit_bytes),
204 };
205
206 #define VIRTNET_STATS_DESC_RX_QSTAT(class, name, qstat_field) \
207 { \
208 #name, \
209 offsetof(struct virtio_net_stats_rx_ ## class, rx_ ## name), \
210 offsetof(struct netdev_queue_stats_rx, qstat_field), \
211 }
212
213 #define VIRTNET_STATS_DESC_TX_QSTAT(class, name, qstat_field) \
214 { \
215 #name, \
216 offsetof(struct virtio_net_stats_tx_ ## class, tx_ ## name), \
217 offsetof(struct netdev_queue_stats_tx, qstat_field), \
218 }
219
220 static const struct virtnet_stat_desc virtnet_stats_rx_basic_desc_qstat[] = {
221 VIRTNET_STATS_DESC_RX_QSTAT(basic, drops, hw_drops),
222 VIRTNET_STATS_DESC_RX_QSTAT(basic, drop_overruns, hw_drop_overruns),
223 };
224
225 static const struct virtnet_stat_desc virtnet_stats_tx_basic_desc_qstat[] = {
226 VIRTNET_STATS_DESC_TX_QSTAT(basic, drops, hw_drops),
227 VIRTNET_STATS_DESC_TX_QSTAT(basic, drop_malformed, hw_drop_errors),
228 };
229
230 static const struct virtnet_stat_desc virtnet_stats_rx_csum_desc_qstat[] = {
231 VIRTNET_STATS_DESC_RX_QSTAT(csum, csum_valid, csum_unnecessary),
232 VIRTNET_STATS_DESC_RX_QSTAT(csum, csum_none, csum_none),
233 VIRTNET_STATS_DESC_RX_QSTAT(csum, csum_bad, csum_bad),
234 };
235
236 static const struct virtnet_stat_desc virtnet_stats_tx_csum_desc_qstat[] = {
237 VIRTNET_STATS_DESC_TX_QSTAT(csum, csum_none, csum_none),
238 VIRTNET_STATS_DESC_TX_QSTAT(csum, needs_csum, needs_csum),
239 };
240
241 static const struct virtnet_stat_desc virtnet_stats_rx_gso_desc_qstat[] = {
242 VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_packets, hw_gro_packets),
243 VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_bytes, hw_gro_bytes),
244 VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_packets_coalesced, hw_gro_wire_packets),
245 VIRTNET_STATS_DESC_RX_QSTAT(gso, gso_bytes_coalesced, hw_gro_wire_bytes),
246 };
247
248 static const struct virtnet_stat_desc virtnet_stats_tx_gso_desc_qstat[] = {
249 VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_packets, hw_gso_packets),
250 VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_bytes, hw_gso_bytes),
251 VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_segments, hw_gso_wire_packets),
252 VIRTNET_STATS_DESC_TX_QSTAT(gso, gso_segments_bytes, hw_gso_wire_bytes),
253 };
254
255 static const struct virtnet_stat_desc virtnet_stats_rx_speed_desc_qstat[] = {
256 VIRTNET_STATS_DESC_RX_QSTAT(speed, ratelimit_packets, hw_drop_ratelimits),
257 };
258
259 static const struct virtnet_stat_desc virtnet_stats_tx_speed_desc_qstat[] = {
260 VIRTNET_STATS_DESC_TX_QSTAT(speed, ratelimit_packets, hw_drop_ratelimits),
261 };
262
263 #define VIRTNET_Q_TYPE_RX 0
264 #define VIRTNET_Q_TYPE_TX 1
265 #define VIRTNET_Q_TYPE_CQ 2
266
267 struct virtnet_interrupt_coalesce {
268 u32 max_packets;
269 u32 max_usecs;
270 };
271
272 /* The dma information of pages allocated at a time. */
273 struct virtnet_rq_dma {
274 dma_addr_t addr;
275 u32 ref;
276 u16 len;
277 u16 need_sync;
278 };
279
280 /* Internal representation of a send virtqueue */
281 struct send_queue {
282 /* Virtqueue associated with this send _queue */
283 struct virtqueue *vq;
284
285 /* TX: fragments + linear part + virtio header */
286 struct scatterlist sg[MAX_SKB_FRAGS + 2];
287
288 /* Name of the send queue: output.$index */
289 char name[16];
290
291 struct virtnet_sq_stats stats;
292
293 struct virtnet_interrupt_coalesce intr_coal;
294
295 struct napi_struct napi;
296
297 /* Record whether sq is in reset state. */
298 bool reset;
299
300 struct xsk_buff_pool *xsk_pool;
301
302 dma_addr_t xsk_hdr_dma_addr;
303 };
304
305 /* Internal representation of a receive virtqueue */
306 struct receive_queue {
307 /* Virtqueue associated with this receive_queue */
308 struct virtqueue *vq;
309
310 struct napi_struct napi;
311
312 struct bpf_prog __rcu *xdp_prog;
313
314 struct virtnet_rq_stats stats;
315
316 /* The number of rx notifications */
317 u16 calls;
318
319 /* Is dynamic interrupt moderation enabled? */
320 bool dim_enabled;
321
322 /* Used to protect dim_enabled and inter_coal */
323 struct mutex dim_lock;
324
325 /* Dynamic Interrupt Moderation */
326 struct dim dim;
327
328 u32 packets_in_napi;
329
330 struct virtnet_interrupt_coalesce intr_coal;
331
332 /* Chain pages by the private ptr. */
333 struct page *pages;
334
335 /* Average packet length for mergeable receive buffers. */
336 struct ewma_pkt_len mrg_avg_pkt_len;
337
338 /* Page frag for packet buffer allocation. */
339 struct page_frag alloc_frag;
340
341 /* RX: fragments + linear part + virtio header */
342 struct scatterlist sg[MAX_SKB_FRAGS + 2];
343
344 /* Min single buffer size for mergeable buffers case. */
345 unsigned int min_buf_len;
346
347 /* Name of this receive queue: input.$index */
348 char name[16];
349
350 struct xdp_rxq_info xdp_rxq;
351
352 /* Record the last dma info to free after new pages is allocated. */
353 struct virtnet_rq_dma *last_dma;
354
355 struct xsk_buff_pool *xsk_pool;
356
357 /* xdp rxq used by xsk */
358 struct xdp_rxq_info xsk_rxq_info;
359
360 struct xdp_buff **xsk_buffs;
361 };
362
363 /* This structure can contain rss message with maximum settings for indirection table and keysize
364 * Note, that default structure that describes RSS configuration virtio_net_rss_config
365 * contains same info but can't handle table values.
366 * In any case, structure would be passed to virtio hw through sg_buf split by parts
367 * because table sizes may be differ according to the device configuration.
368 */
369 #define VIRTIO_NET_RSS_MAX_KEY_SIZE 40
370 struct virtio_net_ctrl_rss {
371 u32 hash_types;
372 u16 indirection_table_mask;
373 u16 unclassified_queue;
374 u16 hash_cfg_reserved; /* for HASH_CONFIG (see virtio_net_hash_config for details) */
375 u16 max_tx_vq;
376 u8 hash_key_length;
377 u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE];
378
379 u16 *indirection_table;
380 };
381
382 /* Control VQ buffers: protected by the rtnl lock */
383 struct control_buf {
384 struct virtio_net_ctrl_hdr hdr;
385 virtio_net_ctrl_ack status;
386 };
387
388 struct virtnet_info {
389 struct virtio_device *vdev;
390 struct virtqueue *cvq;
391 struct net_device *dev;
392 struct send_queue *sq;
393 struct receive_queue *rq;
394 unsigned int status;
395
396 /* Max # of queue pairs supported by the device */
397 u16 max_queue_pairs;
398
399 /* # of queue pairs currently used by the driver */
400 u16 curr_queue_pairs;
401
402 /* # of XDP queue pairs currently used by the driver */
403 u16 xdp_queue_pairs;
404
405 /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
406 bool xdp_enabled;
407
408 /* I like... big packets and I cannot lie! */
409 bool big_packets;
410
411 /* number of sg entries allocated for big packets */
412 unsigned int big_packets_num_skbfrags;
413
414 /* Host will merge rx buffers for big packets (shake it! shake it!) */
415 bool mergeable_rx_bufs;
416
417 /* Host supports rss and/or hash report */
418 bool has_rss;
419 bool has_rss_hash_report;
420 u8 rss_key_size;
421 u16 rss_indir_table_size;
422 u32 rss_hash_types_supported;
423 u32 rss_hash_types_saved;
424 struct virtio_net_ctrl_rss rss;
425
426 /* Has control virtqueue */
427 bool has_cvq;
428
429 /* Lock to protect the control VQ */
430 struct mutex cvq_lock;
431
432 /* Host can handle any s/g split between our header and packet data */
433 bool any_header_sg;
434
435 /* Packet virtio header size */
436 u8 hdr_len;
437
438 /* Work struct for delayed refilling if we run low on memory. */
439 struct delayed_work refill;
440
441 /* Is delayed refill enabled? */
442 bool refill_enabled;
443
444 /* The lock to synchronize the access to refill_enabled */
445 spinlock_t refill_lock;
446
447 /* Work struct for config space updates */
448 struct work_struct config_work;
449
450 /* Work struct for setting rx mode */
451 struct work_struct rx_mode_work;
452
453 /* OK to queue work setting RX mode? */
454 bool rx_mode_work_enabled;
455
456 /* Does the affinity hint is set for virtqueues? */
457 bool affinity_hint_set;
458
459 /* CPU hotplug instances for online & dead */
460 struct hlist_node node;
461 struct hlist_node node_dead;
462
463 struct control_buf *ctrl;
464
465 /* Ethtool settings */
466 u8 duplex;
467 u32 speed;
468
469 /* Is rx dynamic interrupt moderation enabled? */
470 bool rx_dim_enabled;
471
472 /* Interrupt coalescing settings */
473 struct virtnet_interrupt_coalesce intr_coal_tx;
474 struct virtnet_interrupt_coalesce intr_coal_rx;
475
476 unsigned long guest_offloads;
477 unsigned long guest_offloads_capable;
478
479 /* failover when STANDBY feature enabled */
480 struct failover *failover;
481
482 u64 device_stats_cap;
483 };
484
485 struct padded_vnet_hdr {
486 struct virtio_net_hdr_v1_hash hdr;
487 /*
488 * hdr is in a separate sg buffer, and data sg buffer shares same page
489 * with this header sg. This padding makes next sg 16 byte aligned
490 * after the header.
491 */
492 char padding[12];
493 };
494
495 struct virtio_net_common_hdr {
496 union {
497 struct virtio_net_hdr hdr;
498 struct virtio_net_hdr_mrg_rxbuf mrg_hdr;
499 struct virtio_net_hdr_v1_hash hash_v1_hdr;
500 };
501 };
502
503 static struct virtio_net_common_hdr xsk_hdr;
504
505 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
506 static void virtnet_sq_free_unused_buf_done(struct virtqueue *vq);
507 static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
508 struct net_device *dev,
509 unsigned int *xdp_xmit,
510 struct virtnet_rq_stats *stats);
511 static void virtnet_receive_done(struct virtnet_info *vi, struct receive_queue *rq,
512 struct sk_buff *skb, u8 flags);
513 static struct sk_buff *virtnet_skb_append_frag(struct sk_buff *head_skb,
514 struct sk_buff *curr_skb,
515 struct page *page, void *buf,
516 int len, int truesize);
517 static void virtnet_xsk_completed(struct send_queue *sq, int num);
518
519 enum virtnet_xmit_type {
520 VIRTNET_XMIT_TYPE_SKB,
521 VIRTNET_XMIT_TYPE_SKB_ORPHAN,
522 VIRTNET_XMIT_TYPE_XDP,
523 VIRTNET_XMIT_TYPE_XSK,
524 };
525
526 static int rss_indirection_table_alloc(struct virtio_net_ctrl_rss *rss, u16 indir_table_size)
527 {
528 if (!indir_table_size) {
529 rss->indirection_table = NULL;
530 return 0;
531 }
532
533 rss->indirection_table = kmalloc_array(indir_table_size, sizeof(u16), GFP_KERNEL);
534 if (!rss->indirection_table)
535 return -ENOMEM;
536
537 return 0;
538 }
539
540 static void rss_indirection_table_free(struct virtio_net_ctrl_rss *rss)
541 {
542 kfree(rss->indirection_table);
543 }
544
545 /* We use the last two bits of the pointer to distinguish the xmit type. */
546 #define VIRTNET_XMIT_TYPE_MASK (BIT(0) | BIT(1))
547
548 #define VIRTIO_XSK_FLAG_OFFSET 2
549
550 static enum virtnet_xmit_type virtnet_xmit_ptr_unpack(void **ptr)
551 {
552 unsigned long p = (unsigned long)*ptr;
553
554 *ptr = (void *)(p & ~VIRTNET_XMIT_TYPE_MASK);
555
556 return p & VIRTNET_XMIT_TYPE_MASK;
557 }
558
559 static void *virtnet_xmit_ptr_pack(void *ptr, enum virtnet_xmit_type type)
560 {
561 return (void *)((unsigned long)ptr | type);
562 }
563
564 static int virtnet_add_outbuf(struct send_queue *sq, int num, void *data,
565 enum virtnet_xmit_type type)
566 {
567 return virtqueue_add_outbuf(sq->vq, sq->sg, num,
568 virtnet_xmit_ptr_pack(data, type),
569 GFP_ATOMIC);
570 }
571
572 static u32 virtnet_ptr_to_xsk_buff_len(void *ptr)
573 {
574 return ((unsigned long)ptr) >> VIRTIO_XSK_FLAG_OFFSET;
575 }
576
577 static void sg_fill_dma(struct scatterlist *sg, dma_addr_t addr, u32 len)
578 {
579 sg_dma_address(sg) = addr;
580 sg_dma_len(sg) = len;
581 }
582
583 static void __free_old_xmit(struct send_queue *sq, struct netdev_queue *txq,
584 bool in_napi, struct virtnet_sq_free_stats *stats)
585 {
586 struct xdp_frame *frame;
587 struct sk_buff *skb;
588 unsigned int len;
589 void *ptr;
590
591 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
592 switch (virtnet_xmit_ptr_unpack(&ptr)) {
593 case VIRTNET_XMIT_TYPE_SKB:
594 skb = ptr;
595
596 pr_debug("Sent skb %p\n", skb);
597 stats->napi_packets++;
598 stats->napi_bytes += skb->len;
599 napi_consume_skb(skb, in_napi);
600 break;
601
602 case VIRTNET_XMIT_TYPE_SKB_ORPHAN:
603 skb = ptr;
604
605 stats->packets++;
606 stats->bytes += skb->len;
607 napi_consume_skb(skb, in_napi);
608 break;
609
610 case VIRTNET_XMIT_TYPE_XDP:
611 frame = ptr;
612
613 stats->packets++;
614 stats->bytes += xdp_get_frame_len(frame);
615 xdp_return_frame(frame);
616 break;
617
618 case VIRTNET_XMIT_TYPE_XSK:
619 stats->bytes += virtnet_ptr_to_xsk_buff_len(ptr);
620 stats->xsk++;
621 break;
622 }
623 }
624 netdev_tx_completed_queue(txq, stats->napi_packets, stats->napi_bytes);
625 }
626
627 static void virtnet_free_old_xmit(struct send_queue *sq,
628 struct netdev_queue *txq,
629 bool in_napi,
630 struct virtnet_sq_free_stats *stats)
631 {
632 __free_old_xmit(sq, txq, in_napi, stats);
633
634 if (stats->xsk)
635 virtnet_xsk_completed(sq, stats->xsk);
636 }
637
638 /* Converting between virtqueue no. and kernel tx/rx queue no.
639 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
640 */
641 static int vq2txq(struct virtqueue *vq)
642 {
643 return (vq->index - 1) / 2;
644 }
645
646 static int txq2vq(int txq)
647 {
648 return txq * 2 + 1;
649 }
650
651 static int vq2rxq(struct virtqueue *vq)
652 {
653 return vq->index / 2;
654 }
655
656 static int rxq2vq(int rxq)
657 {
658 return rxq * 2;
659 }
660
661 static int vq_type(struct virtnet_info *vi, int qid)
662 {
663 if (qid == vi->max_queue_pairs * 2)
664 return VIRTNET_Q_TYPE_CQ;
665
666 if (qid % 2)
667 return VIRTNET_Q_TYPE_TX;
668
669 return VIRTNET_Q_TYPE_RX;
670 }
671
672 static inline struct virtio_net_common_hdr *
673 skb_vnet_common_hdr(struct sk_buff *skb)
674 {
675 return (struct virtio_net_common_hdr *)skb->cb;
676 }
677
678 /*
679 * private is used to chain pages for big packets, put the whole
680 * most recent used list in the beginning for reuse
681 */
682 static void give_pages(struct receive_queue *rq, struct page *page)
683 {
684 struct page *end;
685
686 /* Find end of list, sew whole thing into vi->rq.pages. */
687 for (end = page; end->private; end = (struct page *)end->private);
688 end->private = (unsigned long)rq->pages;
689 rq->pages = page;
690 }
691
692 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
693 {
694 struct page *p = rq->pages;
695
696 if (p) {
697 rq->pages = (struct page *)p->private;
698 /* clear private here, it is used to chain pages */
699 p->private = 0;
700 } else
701 p = alloc_page(gfp_mask);
702 return p;
703 }
704
705 static void virtnet_rq_free_buf(struct virtnet_info *vi,
706 struct receive_queue *rq, void *buf)
707 {
708 if (vi->mergeable_rx_bufs)
709 put_page(virt_to_head_page(buf));
710 else if (vi->big_packets)
711 give_pages(rq, buf);
712 else
713 put_page(virt_to_head_page(buf));
714 }
715
716 static void enable_delayed_refill(struct virtnet_info *vi)
717 {
718 spin_lock_bh(&vi->refill_lock);
719 vi->refill_enabled = true;
720 spin_unlock_bh(&vi->refill_lock);
721 }
722
723 static void disable_delayed_refill(struct virtnet_info *vi)
724 {
725 spin_lock_bh(&vi->refill_lock);
726 vi->refill_enabled = false;
727 spin_unlock_bh(&vi->refill_lock);
728 }
729
730 static void enable_rx_mode_work(struct virtnet_info *vi)
731 {
732 rtnl_lock();
733 vi->rx_mode_work_enabled = true;
734 rtnl_unlock();
735 }
736
737 static void disable_rx_mode_work(struct virtnet_info *vi)
738 {
739 rtnl_lock();
740 vi->rx_mode_work_enabled = false;
741 rtnl_unlock();
742 }
743
744 static void virtqueue_napi_schedule(struct napi_struct *napi,
745 struct virtqueue *vq)
746 {
747 if (napi_schedule_prep(napi)) {
748 virtqueue_disable_cb(vq);
749 __napi_schedule(napi);
750 }
751 }
752
753 static bool virtqueue_napi_complete(struct napi_struct *napi,
754 struct virtqueue *vq, int processed)
755 {
756 int opaque;
757
758 opaque = virtqueue_enable_cb_prepare(vq);
759 if (napi_complete_done(napi, processed)) {
760 if (unlikely(virtqueue_poll(vq, opaque)))
761 virtqueue_napi_schedule(napi, vq);
762 else
763 return true;
764 } else {
765 virtqueue_disable_cb(vq);
766 }
767
768 return false;
769 }
770
771 static void skb_xmit_done(struct virtqueue *vq)
772 {
773 struct virtnet_info *vi = vq->vdev->priv;
774 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
775
776 /* Suppress further interrupts. */
777 virtqueue_disable_cb(vq);
778
779 if (napi->weight)
780 virtqueue_napi_schedule(napi, vq);
781 else
782 /* We were probably waiting for more output buffers. */
783 netif_wake_subqueue(vi->dev, vq2txq(vq));
784 }
785
786 #define MRG_CTX_HEADER_SHIFT 22
787 static void *mergeable_len_to_ctx(unsigned int truesize,
788 unsigned int headroom)
789 {
790 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
791 }
792
793 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
794 {
795 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
796 }
797
798 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
799 {
800 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
801 }
802
803 static struct sk_buff *virtnet_build_skb(void *buf, unsigned int buflen,
804 unsigned int headroom,
805 unsigned int len)
806 {
807 struct sk_buff *skb;
808
809 skb = build_skb(buf, buflen);
810 if (unlikely(!skb))
811 return NULL;
812
813 skb_reserve(skb, headroom);
814 skb_put(skb, len);
815
816 return skb;
817 }
818
819 /* Called from bottom half context */
820 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
821 struct receive_queue *rq,
822 struct page *page, unsigned int offset,
823 unsigned int len, unsigned int truesize,
824 unsigned int headroom)
825 {
826 struct sk_buff *skb;
827 struct virtio_net_common_hdr *hdr;
828 unsigned int copy, hdr_len, hdr_padded_len;
829 struct page *page_to_free = NULL;
830 int tailroom, shinfo_size;
831 char *p, *hdr_p, *buf;
832
833 p = page_address(page) + offset;
834 hdr_p = p;
835
836 hdr_len = vi->hdr_len;
837 if (vi->mergeable_rx_bufs)
838 hdr_padded_len = hdr_len;
839 else
840 hdr_padded_len = sizeof(struct padded_vnet_hdr);
841
842 buf = p - headroom;
843 len -= hdr_len;
844 offset += hdr_padded_len;
845 p += hdr_padded_len;
846 tailroom = truesize - headroom - hdr_padded_len - len;
847
848 shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
849
850 if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) {
851 skb = virtnet_build_skb(buf, truesize, p - buf, len);
852 if (unlikely(!skb))
853 return NULL;
854
855 page = (struct page *)page->private;
856 if (page)
857 give_pages(rq, page);
858 goto ok;
859 }
860
861 /* copy small packet so we can reuse these pages for small data */
862 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
863 if (unlikely(!skb))
864 return NULL;
865
866 /* Copy all frame if it fits skb->head, otherwise
867 * we let virtio_net_hdr_to_skb() and GRO pull headers as needed.
868 */
869 if (len <= skb_tailroom(skb))
870 copy = len;
871 else
872 copy = ETH_HLEN;
873 skb_put_data(skb, p, copy);
874
875 len -= copy;
876 offset += copy;
877
878 if (vi->mergeable_rx_bufs) {
879 if (len)
880 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
881 else
882 page_to_free = page;
883 goto ok;
884 }
885
886 /*
887 * Verify that we can indeed put this data into a skb.
888 * This is here to handle cases when the device erroneously
889 * tries to receive more than is possible. This is usually
890 * the case of a broken device.
891 */
892 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
893 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
894 dev_kfree_skb(skb);
895 return NULL;
896 }
897 BUG_ON(offset >= PAGE_SIZE);
898 while (len) {
899 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
900 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
901 frag_size, truesize);
902 len -= frag_size;
903 page = (struct page *)page->private;
904 offset = 0;
905 }
906
907 if (page)
908 give_pages(rq, page);
909
910 ok:
911 hdr = skb_vnet_common_hdr(skb);
912 memcpy(hdr, hdr_p, hdr_len);
913 if (page_to_free)
914 put_page(page_to_free);
915
916 return skb;
917 }
918
919 static void virtnet_rq_unmap(struct receive_queue *rq, void *buf, u32 len)
920 {
921 struct virtnet_info *vi = rq->vq->vdev->priv;
922 struct page *page = virt_to_head_page(buf);
923 struct virtnet_rq_dma *dma;
924 void *head;
925 int offset;
926
927 BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
928
929 head = page_address(page);
930
931 dma = head;
932
933 --dma->ref;
934
935 if (dma->need_sync && len) {
936 offset = buf - (head + sizeof(*dma));
937
938 virtqueue_dma_sync_single_range_for_cpu(rq->vq, dma->addr,
939 offset, len,
940 DMA_FROM_DEVICE);
941 }
942
943 if (dma->ref)
944 return;
945
946 virtqueue_dma_unmap_single_attrs(rq->vq, dma->addr, dma->len,
947 DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
948 put_page(page);
949 }
950
951 static void *virtnet_rq_get_buf(struct receive_queue *rq, u32 *len, void **ctx)
952 {
953 struct virtnet_info *vi = rq->vq->vdev->priv;
954 void *buf;
955
956 BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
957
958 buf = virtqueue_get_buf_ctx(rq->vq, len, ctx);
959 if (buf)
960 virtnet_rq_unmap(rq, buf, *len);
961
962 return buf;
963 }
964
965 static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len)
966 {
967 struct virtnet_info *vi = rq->vq->vdev->priv;
968 struct virtnet_rq_dma *dma;
969 dma_addr_t addr;
970 u32 offset;
971 void *head;
972
973 BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
974
975 head = page_address(rq->alloc_frag.page);
976
977 offset = buf - head;
978
979 dma = head;
980
981 addr = dma->addr - sizeof(*dma) + offset;
982
983 sg_init_table(rq->sg, 1);
984 sg_fill_dma(rq->sg, addr, len);
985 }
986
987 static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp)
988 {
989 struct page_frag *alloc_frag = &rq->alloc_frag;
990 struct virtnet_info *vi = rq->vq->vdev->priv;
991 struct virtnet_rq_dma *dma;
992 void *buf, *head;
993 dma_addr_t addr;
994
995 BUG_ON(vi->big_packets && !vi->mergeable_rx_bufs);
996
997 head = page_address(alloc_frag->page);
998
999 dma = head;
1000
1001 /* new pages */
1002 if (!alloc_frag->offset) {
1003 if (rq->last_dma) {
1004 /* Now, the new page is allocated, the last dma
1005 * will not be used. So the dma can be unmapped
1006 * if the ref is 0.
1007 */
1008 virtnet_rq_unmap(rq, rq->last_dma, 0);
1009 rq->last_dma = NULL;
1010 }
1011
1012 dma->len = alloc_frag->size - sizeof(*dma);
1013
1014 addr = virtqueue_dma_map_single_attrs(rq->vq, dma + 1,
1015 dma->len, DMA_FROM_DEVICE, 0);
1016 if (virtqueue_dma_mapping_error(rq->vq, addr))
1017 return NULL;
1018
1019 dma->addr = addr;
1020 dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr);
1021
1022 /* Add a reference to dma to prevent the entire dma from
1023 * being released during error handling. This reference
1024 * will be freed after the pages are no longer used.
1025 */
1026 get_page(alloc_frag->page);
1027 dma->ref = 1;
1028 alloc_frag->offset = sizeof(*dma);
1029
1030 rq->last_dma = dma;
1031 }
1032
1033 ++dma->ref;
1034
1035 buf = head + alloc_frag->offset;
1036
1037 get_page(alloc_frag->page);
1038 alloc_frag->offset += size;
1039
1040 return buf;
1041 }
1042
1043 static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
1044 {
1045 struct virtnet_info *vi = vq->vdev->priv;
1046 struct receive_queue *rq;
1047 int i = vq2rxq(vq);
1048
1049 rq = &vi->rq[i];
1050
1051 if (rq->xsk_pool) {
1052 xsk_buff_free((struct xdp_buff *)buf);
1053 return;
1054 }
1055
1056 if (!vi->big_packets || vi->mergeable_rx_bufs)
1057 virtnet_rq_unmap(rq, buf, 0);
1058
1059 virtnet_rq_free_buf(vi, rq, buf);
1060 }
1061
1062 static void free_old_xmit(struct send_queue *sq, struct netdev_queue *txq,
1063 bool in_napi)
1064 {
1065 struct virtnet_sq_free_stats stats = {0};
1066
1067 virtnet_free_old_xmit(sq, txq, in_napi, &stats);
1068
1069 /* Avoid overhead when no packets have been processed
1070 * happens when called speculatively from start_xmit.
1071 */
1072 if (!stats.packets && !stats.napi_packets)
1073 return;
1074
1075 u64_stats_update_begin(&sq->stats.syncp);
1076 u64_stats_add(&sq->stats.bytes, stats.bytes + stats.napi_bytes);
1077 u64_stats_add(&sq->stats.packets, stats.packets + stats.napi_packets);
1078 u64_stats_update_end(&sq->stats.syncp);
1079 }
1080
1081 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
1082 {
1083 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1084 return false;
1085 else if (q < vi->curr_queue_pairs)
1086 return true;
1087 else
1088 return false;
1089 }
1090
1091 static void check_sq_full_and_disable(struct virtnet_info *vi,
1092 struct net_device *dev,
1093 struct send_queue *sq)
1094 {
1095 bool use_napi = sq->napi.weight;
1096 int qnum;
1097
1098 qnum = sq - vi->sq;
1099
1100 /* If running out of space, stop queue to avoid getting packets that we
1101 * are then unable to transmit.
1102 * An alternative would be to force queuing layer to requeue the skb by
1103 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1104 * returned in a normal path of operation: it means that driver is not
1105 * maintaining the TX queue stop/start state properly, and causes
1106 * the stack to do a non-trivial amount of useless work.
1107 * Since most packets only take 1 or 2 ring slots, stopping the queue
1108 * early means 16 slots are typically wasted.
1109 */
1110 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1111 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1112
1113 netif_tx_stop_queue(txq);
1114 u64_stats_update_begin(&sq->stats.syncp);
1115 u64_stats_inc(&sq->stats.stop);
1116 u64_stats_update_end(&sq->stats.syncp);
1117 if (use_napi) {
1118 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq)))
1119 virtqueue_napi_schedule(&sq->napi, sq->vq);
1120 } else if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1121 /* More just got used, free them then recheck. */
1122 free_old_xmit(sq, txq, false);
1123 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1124 netif_start_subqueue(dev, qnum);
1125 u64_stats_update_begin(&sq->stats.syncp);
1126 u64_stats_inc(&sq->stats.wake);
1127 u64_stats_update_end(&sq->stats.syncp);
1128 virtqueue_disable_cb(sq->vq);
1129 }
1130 }
1131 }
1132 }
1133
1134 static struct xdp_buff *buf_to_xdp(struct virtnet_info *vi,
1135 struct receive_queue *rq, void *buf, u32 len)
1136 {
1137 struct xdp_buff *xdp;
1138 u32 bufsize;
1139
1140 xdp = (struct xdp_buff *)buf;
1141
1142 bufsize = xsk_pool_get_rx_frame_size(rq->xsk_pool) + vi->hdr_len;
1143
1144 if (unlikely(len > bufsize)) {
1145 pr_debug("%s: rx error: len %u exceeds truesize %u\n",
1146 vi->dev->name, len, bufsize);
1147 DEV_STATS_INC(vi->dev, rx_length_errors);
1148 xsk_buff_free(xdp);
1149 return NULL;
1150 }
1151
1152 xsk_buff_set_size(xdp, len);
1153 xsk_buff_dma_sync_for_cpu(xdp);
1154
1155 return xdp;
1156 }
1157
1158 static struct sk_buff *xsk_construct_skb(struct receive_queue *rq,
1159 struct xdp_buff *xdp)
1160 {
1161 unsigned int metasize = xdp->data - xdp->data_meta;
1162 struct sk_buff *skb;
1163 unsigned int size;
1164
1165 size = xdp->data_end - xdp->data_hard_start;
1166 skb = napi_alloc_skb(&rq->napi, size);
1167 if (unlikely(!skb)) {
1168 xsk_buff_free(xdp);
1169 return NULL;
1170 }
1171
1172 skb_reserve(skb, xdp->data_meta - xdp->data_hard_start);
1173
1174 size = xdp->data_end - xdp->data_meta;
1175 memcpy(__skb_put(skb, size), xdp->data_meta, size);
1176
1177 if (metasize) {
1178 __skb_pull(skb, metasize);
1179 skb_metadata_set(skb, metasize);
1180 }
1181
1182 xsk_buff_free(xdp);
1183
1184 return skb;
1185 }
1186
1187 static struct sk_buff *virtnet_receive_xsk_small(struct net_device *dev, struct virtnet_info *vi,
1188 struct receive_queue *rq, struct xdp_buff *xdp,
1189 unsigned int *xdp_xmit,
1190 struct virtnet_rq_stats *stats)
1191 {
1192 struct bpf_prog *prog;
1193 u32 ret;
1194
1195 ret = XDP_PASS;
1196 rcu_read_lock();
1197 prog = rcu_dereference(rq->xdp_prog);
1198 if (prog)
1199 ret = virtnet_xdp_handler(prog, xdp, dev, xdp_xmit, stats);
1200 rcu_read_unlock();
1201
1202 switch (ret) {
1203 case XDP_PASS:
1204 return xsk_construct_skb(rq, xdp);
1205
1206 case XDP_TX:
1207 case XDP_REDIRECT:
1208 return NULL;
1209
1210 default:
1211 /* drop packet */
1212 xsk_buff_free(xdp);
1213 u64_stats_inc(&stats->drops);
1214 return NULL;
1215 }
1216 }
1217
1218 static void xsk_drop_follow_bufs(struct net_device *dev,
1219 struct receive_queue *rq,
1220 u32 num_buf,
1221 struct virtnet_rq_stats *stats)
1222 {
1223 struct xdp_buff *xdp;
1224 u32 len;
1225
1226 while (num_buf-- > 1) {
1227 xdp = virtqueue_get_buf(rq->vq, &len);
1228 if (unlikely(!xdp)) {
1229 pr_debug("%s: rx error: %d buffers missing\n",
1230 dev->name, num_buf);
1231 DEV_STATS_INC(dev, rx_length_errors);
1232 break;
1233 }
1234 u64_stats_add(&stats->bytes, len);
1235 xsk_buff_free(xdp);
1236 }
1237 }
1238
1239 static int xsk_append_merge_buffer(struct virtnet_info *vi,
1240 struct receive_queue *rq,
1241 struct sk_buff *head_skb,
1242 u32 num_buf,
1243 struct virtio_net_hdr_mrg_rxbuf *hdr,
1244 struct virtnet_rq_stats *stats)
1245 {
1246 struct sk_buff *curr_skb;
1247 struct xdp_buff *xdp;
1248 u32 len, truesize;
1249 struct page *page;
1250 void *buf;
1251
1252 curr_skb = head_skb;
1253
1254 while (--num_buf) {
1255 buf = virtqueue_get_buf(rq->vq, &len);
1256 if (unlikely(!buf)) {
1257 pr_debug("%s: rx error: %d buffers out of %d missing\n",
1258 vi->dev->name, num_buf,
1259 virtio16_to_cpu(vi->vdev,
1260 hdr->num_buffers));
1261 DEV_STATS_INC(vi->dev, rx_length_errors);
1262 return -EINVAL;
1263 }
1264
1265 u64_stats_add(&stats->bytes, len);
1266
1267 xdp = buf_to_xdp(vi, rq, buf, len);
1268 if (!xdp)
1269 goto err;
1270
1271 buf = napi_alloc_frag(len);
1272 if (!buf) {
1273 xsk_buff_free(xdp);
1274 goto err;
1275 }
1276
1277 memcpy(buf, xdp->data - vi->hdr_len, len);
1278
1279 xsk_buff_free(xdp);
1280
1281 page = virt_to_page(buf);
1282
1283 truesize = len;
1284
1285 curr_skb = virtnet_skb_append_frag(head_skb, curr_skb, page,
1286 buf, len, truesize);
1287 if (!curr_skb) {
1288 put_page(page);
1289 goto err;
1290 }
1291 }
1292
1293 return 0;
1294
1295 err:
1296 xsk_drop_follow_bufs(vi->dev, rq, num_buf, stats);
1297 return -EINVAL;
1298 }
1299
1300 static struct sk_buff *virtnet_receive_xsk_merge(struct net_device *dev, struct virtnet_info *vi,
1301 struct receive_queue *rq, struct xdp_buff *xdp,
1302 unsigned int *xdp_xmit,
1303 struct virtnet_rq_stats *stats)
1304 {
1305 struct virtio_net_hdr_mrg_rxbuf *hdr;
1306 struct bpf_prog *prog;
1307 struct sk_buff *skb;
1308 u32 ret, num_buf;
1309
1310 hdr = xdp->data - vi->hdr_len;
1311 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
1312
1313 ret = XDP_PASS;
1314 rcu_read_lock();
1315 prog = rcu_dereference(rq->xdp_prog);
1316 /* TODO: support multi buffer. */
1317 if (prog && num_buf == 1)
1318 ret = virtnet_xdp_handler(prog, xdp, dev, xdp_xmit, stats);
1319 rcu_read_unlock();
1320
1321 switch (ret) {
1322 case XDP_PASS:
1323 skb = xsk_construct_skb(rq, xdp);
1324 if (!skb)
1325 goto drop_bufs;
1326
1327 if (xsk_append_merge_buffer(vi, rq, skb, num_buf, hdr, stats)) {
1328 dev_kfree_skb(skb);
1329 goto drop;
1330 }
1331
1332 return skb;
1333
1334 case XDP_TX:
1335 case XDP_REDIRECT:
1336 return NULL;
1337
1338 default:
1339 /* drop packet */
1340 xsk_buff_free(xdp);
1341 }
1342
1343 drop_bufs:
1344 xsk_drop_follow_bufs(dev, rq, num_buf, stats);
1345
1346 drop:
1347 u64_stats_inc(&stats->drops);
1348 return NULL;
1349 }
1350
1351 static void virtnet_receive_xsk_buf(struct virtnet_info *vi, struct receive_queue *rq,
1352 void *buf, u32 len,
1353 unsigned int *xdp_xmit,
1354 struct virtnet_rq_stats *stats)
1355 {
1356 struct net_device *dev = vi->dev;
1357 struct sk_buff *skb = NULL;
1358 struct xdp_buff *xdp;
1359 u8 flags;
1360
1361 len -= vi->hdr_len;
1362
1363 u64_stats_add(&stats->bytes, len);
1364
1365 xdp = buf_to_xdp(vi, rq, buf, len);
1366 if (!xdp)
1367 return;
1368
1369 if (unlikely(len < ETH_HLEN)) {
1370 pr_debug("%s: short packet %i\n", dev->name, len);
1371 DEV_STATS_INC(dev, rx_length_errors);
1372 xsk_buff_free(xdp);
1373 return;
1374 }
1375
1376 flags = ((struct virtio_net_common_hdr *)(xdp->data - vi->hdr_len))->hdr.flags;
1377
1378 if (!vi->mergeable_rx_bufs)
1379 skb = virtnet_receive_xsk_small(dev, vi, rq, xdp, xdp_xmit, stats);
1380 else
1381 skb = virtnet_receive_xsk_merge(dev, vi, rq, xdp, xdp_xmit, stats);
1382
1383 if (skb)
1384 virtnet_receive_done(vi, rq, skb, flags);
1385 }
1386
1387 static int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct receive_queue *rq,
1388 struct xsk_buff_pool *pool, gfp_t gfp)
1389 {
1390 struct xdp_buff **xsk_buffs;
1391 dma_addr_t addr;
1392 int err = 0;
1393 u32 len, i;
1394 int num;
1395
1396 xsk_buffs = rq->xsk_buffs;
1397
1398 num = xsk_buff_alloc_batch(pool, xsk_buffs, rq->vq->num_free);
1399 if (!num)
1400 return -ENOMEM;
1401
1402 len = xsk_pool_get_rx_frame_size(pool) + vi->hdr_len;
1403
1404 for (i = 0; i < num; ++i) {
1405 /* Use the part of XDP_PACKET_HEADROOM as the virtnet hdr space.
1406 * We assume XDP_PACKET_HEADROOM is larger than hdr->len.
1407 * (see function virtnet_xsk_pool_enable)
1408 */
1409 addr = xsk_buff_xdp_get_dma(xsk_buffs[i]) - vi->hdr_len;
1410
1411 sg_init_table(rq->sg, 1);
1412 sg_fill_dma(rq->sg, addr, len);
1413
1414 err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1,
1415 xsk_buffs[i], NULL, gfp);
1416 if (err)
1417 goto err;
1418 }
1419
1420 return num;
1421
1422 err:
1423 for (; i < num; ++i)
1424 xsk_buff_free(xsk_buffs[i]);
1425
1426 return err;
1427 }
1428
1429 static void *virtnet_xsk_to_ptr(u32 len)
1430 {
1431 unsigned long p;
1432
1433 p = len << VIRTIO_XSK_FLAG_OFFSET;
1434
1435 return virtnet_xmit_ptr_pack((void *)p, VIRTNET_XMIT_TYPE_XSK);
1436 }
1437
1438 static int virtnet_xsk_xmit_one(struct send_queue *sq,
1439 struct xsk_buff_pool *pool,
1440 struct xdp_desc *desc)
1441 {
1442 struct virtnet_info *vi;
1443 dma_addr_t addr;
1444
1445 vi = sq->vq->vdev->priv;
1446
1447 addr = xsk_buff_raw_get_dma(pool, desc->addr);
1448 xsk_buff_raw_dma_sync_for_device(pool, addr, desc->len);
1449
1450 sg_init_table(sq->sg, 2);
1451 sg_fill_dma(sq->sg, sq->xsk_hdr_dma_addr, vi->hdr_len);
1452 sg_fill_dma(sq->sg + 1, addr, desc->len);
1453
1454 return virtqueue_add_outbuf_premapped(sq->vq, sq->sg, 2,
1455 virtnet_xsk_to_ptr(desc->len),
1456 GFP_ATOMIC);
1457 }
1458
1459 static int virtnet_xsk_xmit_batch(struct send_queue *sq,
1460 struct xsk_buff_pool *pool,
1461 unsigned int budget,
1462 u64 *kicks)
1463 {
1464 struct xdp_desc *descs = pool->tx_descs;
1465 bool kick = false;
1466 u32 nb_pkts, i;
1467 int err;
1468
1469 budget = min_t(u32, budget, sq->vq->num_free);
1470
1471 nb_pkts = xsk_tx_peek_release_desc_batch(pool, budget);
1472 if (!nb_pkts)
1473 return 0;
1474
1475 for (i = 0; i < nb_pkts; i++) {
1476 err = virtnet_xsk_xmit_one(sq, pool, &descs[i]);
1477 if (unlikely(err)) {
1478 xsk_tx_completed(sq->xsk_pool, nb_pkts - i);
1479 break;
1480 }
1481
1482 kick = true;
1483 }
1484
1485 if (kick && virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
1486 (*kicks)++;
1487
1488 return i;
1489 }
1490
1491 static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
1492 int budget)
1493 {
1494 struct virtnet_info *vi = sq->vq->vdev->priv;
1495 struct virtnet_sq_free_stats stats = {};
1496 struct net_device *dev = vi->dev;
1497 u64 kicks = 0;
1498 int sent;
1499
1500 /* Avoid to wakeup napi meanless, so call __free_old_xmit instead of
1501 * free_old_xmit().
1502 */
1503 __free_old_xmit(sq, netdev_get_tx_queue(dev, sq - vi->sq), true, &stats);
1504
1505 if (stats.xsk)
1506 xsk_tx_completed(sq->xsk_pool, stats.xsk);
1507
1508 sent = virtnet_xsk_xmit_batch(sq, pool, budget, &kicks);
1509
1510 if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
1511 check_sq_full_and_disable(vi, vi->dev, sq);
1512
1513 if (sent) {
1514 struct netdev_queue *txq;
1515
1516 txq = netdev_get_tx_queue(vi->dev, sq - vi->sq);
1517 txq_trans_cond_update(txq);
1518 }
1519
1520 u64_stats_update_begin(&sq->stats.syncp);
1521 u64_stats_add(&sq->stats.packets, stats.packets);
1522 u64_stats_add(&sq->stats.bytes, stats.bytes);
1523 u64_stats_add(&sq->stats.kicks, kicks);
1524 u64_stats_add(&sq->stats.xdp_tx, sent);
1525 u64_stats_update_end(&sq->stats.syncp);
1526
1527 if (xsk_uses_need_wakeup(pool))
1528 xsk_set_tx_need_wakeup(pool);
1529
1530 return sent;
1531 }
1532
1533 static void xsk_wakeup(struct send_queue *sq)
1534 {
1535 if (napi_if_scheduled_mark_missed(&sq->napi))
1536 return;
1537
1538 local_bh_disable();
1539 virtqueue_napi_schedule(&sq->napi, sq->vq);
1540 local_bh_enable();
1541 }
1542
1543 static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag)
1544 {
1545 struct virtnet_info *vi = netdev_priv(dev);
1546 struct send_queue *sq;
1547
1548 if (!netif_running(dev))
1549 return -ENETDOWN;
1550
1551 if (qid >= vi->curr_queue_pairs)
1552 return -EINVAL;
1553
1554 sq = &vi->sq[qid];
1555
1556 xsk_wakeup(sq);
1557 return 0;
1558 }
1559
1560 static void virtnet_xsk_completed(struct send_queue *sq, int num)
1561 {
1562 xsk_tx_completed(sq->xsk_pool, num);
1563
1564 /* If this is called by rx poll, start_xmit and xdp xmit we should
1565 * wakeup the tx napi to consume the xsk tx queue, because the tx
1566 * interrupt may not be triggered.
1567 */
1568 xsk_wakeup(sq);
1569 }
1570
1571 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
1572 struct send_queue *sq,
1573 struct xdp_frame *xdpf)
1574 {
1575 struct virtio_net_hdr_mrg_rxbuf *hdr;
1576 struct skb_shared_info *shinfo;
1577 u8 nr_frags = 0;
1578 int err, i;
1579
1580 if (unlikely(xdpf->headroom < vi->hdr_len))
1581 return -EOVERFLOW;
1582
1583 if (unlikely(xdp_frame_has_frags(xdpf))) {
1584 shinfo = xdp_get_shared_info_from_frame(xdpf);
1585 nr_frags = shinfo->nr_frags;
1586 }
1587
1588 /* In wrapping function virtnet_xdp_xmit(), we need to free
1589 * up the pending old buffers, where we need to calculate the
1590 * position of skb_shared_info in xdp_get_frame_len() and
1591 * xdp_return_frame(), which will involve to xdpf->data and
1592 * xdpf->headroom. Therefore, we need to update the value of
1593 * headroom synchronously here.
1594 */
1595 xdpf->headroom -= vi->hdr_len;
1596 xdpf->data -= vi->hdr_len;
1597 /* Zero header and leave csum up to XDP layers */
1598 hdr = xdpf->data;
1599 memset(hdr, 0, vi->hdr_len);
1600 xdpf->len += vi->hdr_len;
1601
1602 sg_init_table(sq->sg, nr_frags + 1);
1603 sg_set_buf(sq->sg, xdpf->data, xdpf->len);
1604 for (i = 0; i < nr_frags; i++) {
1605 skb_frag_t *frag = &shinfo->frags[i];
1606
1607 sg_set_page(&sq->sg[i + 1], skb_frag_page(frag),
1608 skb_frag_size(frag), skb_frag_off(frag));
1609 }
1610
1611 err = virtnet_add_outbuf(sq, nr_frags + 1, xdpf, VIRTNET_XMIT_TYPE_XDP);
1612 if (unlikely(err))
1613 return -ENOSPC; /* Caller handle free/refcnt */
1614
1615 return 0;
1616 }
1617
1618 /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on
1619 * the current cpu, so it does not need to be locked.
1620 *
1621 * Here we use marco instead of inline functions because we have to deal with
1622 * three issues at the same time: 1. the choice of sq. 2. judge and execute the
1623 * lock/unlock of txq 3. make sparse happy. It is difficult for two inline
1624 * functions to perfectly solve these three problems at the same time.
1625 */
1626 #define virtnet_xdp_get_sq(vi) ({ \
1627 int cpu = smp_processor_id(); \
1628 struct netdev_queue *txq; \
1629 typeof(vi) v = (vi); \
1630 unsigned int qp; \
1631 \
1632 if (v->curr_queue_pairs > nr_cpu_ids) { \
1633 qp = v->curr_queue_pairs - v->xdp_queue_pairs; \
1634 qp += cpu; \
1635 txq = netdev_get_tx_queue(v->dev, qp); \
1636 __netif_tx_acquire(txq); \
1637 } else { \
1638 qp = cpu % v->curr_queue_pairs; \
1639 txq = netdev_get_tx_queue(v->dev, qp); \
1640 __netif_tx_lock(txq, cpu); \
1641 } \
1642 v->sq + qp; \
1643 })
1644
1645 #define virtnet_xdp_put_sq(vi, q) { \
1646 struct netdev_queue *txq; \
1647 typeof(vi) v = (vi); \
1648 \
1649 txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \
1650 if (v->curr_queue_pairs > nr_cpu_ids) \
1651 __netif_tx_release(txq); \
1652 else \
1653 __netif_tx_unlock(txq); \
1654 }
1655
1656 static int virtnet_xdp_xmit(struct net_device *dev,
1657 int n, struct xdp_frame **frames, u32 flags)
1658 {
1659 struct virtnet_info *vi = netdev_priv(dev);
1660 struct virtnet_sq_free_stats stats = {0};
1661 struct receive_queue *rq = vi->rq;
1662 struct bpf_prog *xdp_prog;
1663 struct send_queue *sq;
1664 int nxmit = 0;
1665 int kicks = 0;
1666 int ret;
1667 int i;
1668
1669 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
1670 * indicate XDP resources have been successfully allocated.
1671 */
1672 xdp_prog = rcu_access_pointer(rq->xdp_prog);
1673 if (!xdp_prog)
1674 return -ENXIO;
1675
1676 sq = virtnet_xdp_get_sq(vi);
1677
1678 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
1679 ret = -EINVAL;
1680 goto out;
1681 }
1682
1683 /* Free up any pending old buffers before queueing new ones. */
1684 virtnet_free_old_xmit(sq, netdev_get_tx_queue(dev, sq - vi->sq),
1685 false, &stats);
1686
1687 for (i = 0; i < n; i++) {
1688 struct xdp_frame *xdpf = frames[i];
1689
1690 if (__virtnet_xdp_xmit_one(vi, sq, xdpf))
1691 break;
1692 nxmit++;
1693 }
1694 ret = nxmit;
1695
1696 if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
1697 check_sq_full_and_disable(vi, dev, sq);
1698
1699 if (flags & XDP_XMIT_FLUSH) {
1700 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
1701 kicks = 1;
1702 }
1703 out:
1704 u64_stats_update_begin(&sq->stats.syncp);
1705 u64_stats_add(&sq->stats.bytes, stats.bytes);
1706 u64_stats_add(&sq->stats.packets, stats.packets);
1707 u64_stats_add(&sq->stats.xdp_tx, n);
1708 u64_stats_add(&sq->stats.xdp_tx_drops, n - nxmit);
1709 u64_stats_add(&sq->stats.kicks, kicks);
1710 u64_stats_update_end(&sq->stats.syncp);
1711
1712 virtnet_xdp_put_sq(vi, sq);
1713 return ret;
1714 }
1715
1716 static void put_xdp_frags(struct xdp_buff *xdp)
1717 {
1718 struct skb_shared_info *shinfo;
1719 struct page *xdp_page;
1720 int i;
1721
1722 if (xdp_buff_has_frags(xdp)) {
1723 shinfo = xdp_get_shared_info_from_buff(xdp);
1724 for (i = 0; i < shinfo->nr_frags; i++) {
1725 xdp_page = skb_frag_page(&shinfo->frags[i]);
1726 put_page(xdp_page);
1727 }
1728 }
1729 }
1730
1731 static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
1732 struct net_device *dev,
1733 unsigned int *xdp_xmit,
1734 struct virtnet_rq_stats *stats)
1735 {
1736 struct xdp_frame *xdpf;
1737 int err;
1738 u32 act;
1739
1740 act = bpf_prog_run_xdp(xdp_prog, xdp);
1741 u64_stats_inc(&stats->xdp_packets);
1742
1743 switch (act) {
1744 case XDP_PASS:
1745 return act;
1746
1747 case XDP_TX:
1748 u64_stats_inc(&stats->xdp_tx);
1749 xdpf = xdp_convert_buff_to_frame(xdp);
1750 if (unlikely(!xdpf)) {
1751 netdev_dbg(dev, "convert buff to frame failed for xdp\n");
1752 return XDP_DROP;
1753 }
1754
1755 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
1756 if (unlikely(!err)) {
1757 xdp_return_frame_rx_napi(xdpf);
1758 } else if (unlikely(err < 0)) {
1759 trace_xdp_exception(dev, xdp_prog, act);
1760 return XDP_DROP;
1761 }
1762 *xdp_xmit |= VIRTIO_XDP_TX;
1763 return act;
1764
1765 case XDP_REDIRECT:
1766 u64_stats_inc(&stats->xdp_redirects);
1767 err = xdp_do_redirect(dev, xdp, xdp_prog);
1768 if (err)
1769 return XDP_DROP;
1770
1771 *xdp_xmit |= VIRTIO_XDP_REDIR;
1772 return act;
1773
1774 default:
1775 bpf_warn_invalid_xdp_action(dev, xdp_prog, act);
1776 fallthrough;
1777 case XDP_ABORTED:
1778 trace_xdp_exception(dev, xdp_prog, act);
1779 fallthrough;
1780 case XDP_DROP:
1781 return XDP_DROP;
1782 }
1783 }
1784
1785 static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
1786 {
1787 return vi->xdp_enabled ? XDP_PACKET_HEADROOM : 0;
1788 }
1789
1790 /* We copy the packet for XDP in the following cases:
1791 *
1792 * 1) Packet is scattered across multiple rx buffers.
1793 * 2) Headroom space is insufficient.
1794 *
1795 * This is inefficient but it's a temporary condition that
1796 * we hit right after XDP is enabled and until queue is refilled
1797 * with large buffers with sufficient headroom - so it should affect
1798 * at most queue size packets.
1799 * Afterwards, the conditions to enable
1800 * XDP should preclude the underlying device from sending packets
1801 * across multiple buffers (num_buf > 1), and we make sure buffers
1802 * have enough headroom.
1803 */
1804 static struct page *xdp_linearize_page(struct receive_queue *rq,
1805 int *num_buf,
1806 struct page *p,
1807 int offset,
1808 int page_off,
1809 unsigned int *len)
1810 {
1811 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1812 struct page *page;
1813
1814 if (page_off + *len + tailroom > PAGE_SIZE)
1815 return NULL;
1816
1817 page = alloc_page(GFP_ATOMIC);
1818 if (!page)
1819 return NULL;
1820
1821 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
1822 page_off += *len;
1823
1824 while (--*num_buf) {
1825 unsigned int buflen;
1826 void *buf;
1827 int off;
1828
1829 buf = virtnet_rq_get_buf(rq, &buflen, NULL);
1830 if (unlikely(!buf))
1831 goto err_buf;
1832
1833 p = virt_to_head_page(buf);
1834 off = buf - page_address(p);
1835
1836 /* guard against a misconfigured or uncooperative backend that
1837 * is sending packet larger than the MTU.
1838 */
1839 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
1840 put_page(p);
1841 goto err_buf;
1842 }
1843
1844 memcpy(page_address(page) + page_off,
1845 page_address(p) + off, buflen);
1846 page_off += buflen;
1847 put_page(p);
1848 }
1849
1850 /* Headroom does not contribute to packet length */
1851 *len = page_off - XDP_PACKET_HEADROOM;
1852 return page;
1853 err_buf:
1854 __free_pages(page, 0);
1855 return NULL;
1856 }
1857
1858 static struct sk_buff *receive_small_build_skb(struct virtnet_info *vi,
1859 unsigned int xdp_headroom,
1860 void *buf,
1861 unsigned int len)
1862 {
1863 unsigned int header_offset;
1864 unsigned int headroom;
1865 unsigned int buflen;
1866 struct sk_buff *skb;
1867
1868 header_offset = VIRTNET_RX_PAD + xdp_headroom;
1869 headroom = vi->hdr_len + header_offset;
1870 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1871 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1872
1873 skb = virtnet_build_skb(buf, buflen, headroom, len);
1874 if (unlikely(!skb))
1875 return NULL;
1876
1877 buf += header_offset;
1878 memcpy(skb_vnet_common_hdr(skb), buf, vi->hdr_len);
1879
1880 return skb;
1881 }
1882
1883 static struct sk_buff *receive_small_xdp(struct net_device *dev,
1884 struct virtnet_info *vi,
1885 struct receive_queue *rq,
1886 struct bpf_prog *xdp_prog,
1887 void *buf,
1888 unsigned int xdp_headroom,
1889 unsigned int len,
1890 unsigned int *xdp_xmit,
1891 struct virtnet_rq_stats *stats)
1892 {
1893 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
1894 unsigned int headroom = vi->hdr_len + header_offset;
1895 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
1896 struct page *page = virt_to_head_page(buf);
1897 struct page *xdp_page;
1898 unsigned int buflen;
1899 struct xdp_buff xdp;
1900 struct sk_buff *skb;
1901 unsigned int metasize = 0;
1902 u32 act;
1903
1904 if (unlikely(hdr->hdr.gso_type))
1905 goto err_xdp;
1906
1907 /* Partially checksummed packets must be dropped. */
1908 if (unlikely(hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM))
1909 goto err_xdp;
1910
1911 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1912 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1913
1914 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
1915 int offset = buf - page_address(page) + header_offset;
1916 unsigned int tlen = len + vi->hdr_len;
1917 int num_buf = 1;
1918
1919 xdp_headroom = virtnet_get_headroom(vi);
1920 header_offset = VIRTNET_RX_PAD + xdp_headroom;
1921 headroom = vi->hdr_len + header_offset;
1922 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
1923 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1924 xdp_page = xdp_linearize_page(rq, &num_buf, page,
1925 offset, header_offset,
1926 &tlen);
1927 if (!xdp_page)
1928 goto err_xdp;
1929
1930 buf = page_address(xdp_page);
1931 put_page(page);
1932 page = xdp_page;
1933 }
1934
1935 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq);
1936 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len,
1937 xdp_headroom, len, true);
1938
1939 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
1940
1941 switch (act) {
1942 case XDP_PASS:
1943 /* Recalculate length in case bpf program changed it */
1944 len = xdp.data_end - xdp.data;
1945 metasize = xdp.data - xdp.data_meta;
1946 break;
1947
1948 case XDP_TX:
1949 case XDP_REDIRECT:
1950 goto xdp_xmit;
1951
1952 default:
1953 goto err_xdp;
1954 }
1955
1956 skb = virtnet_build_skb(buf, buflen, xdp.data - buf, len);
1957 if (unlikely(!skb))
1958 goto err;
1959
1960 if (metasize)
1961 skb_metadata_set(skb, metasize);
1962
1963 return skb;
1964
1965 err_xdp:
1966 u64_stats_inc(&stats->xdp_drops);
1967 err:
1968 u64_stats_inc(&stats->drops);
1969 put_page(page);
1970 xdp_xmit:
1971 return NULL;
1972 }
1973
1974 static struct sk_buff *receive_small(struct net_device *dev,
1975 struct virtnet_info *vi,
1976 struct receive_queue *rq,
1977 void *buf, void *ctx,
1978 unsigned int len,
1979 unsigned int *xdp_xmit,
1980 struct virtnet_rq_stats *stats)
1981 {
1982 unsigned int xdp_headroom = (unsigned long)ctx;
1983 struct page *page = virt_to_head_page(buf);
1984 struct sk_buff *skb;
1985
1986 /* We passed the address of virtnet header to virtio-core,
1987 * so truncate the padding.
1988 */
1989 buf -= VIRTNET_RX_PAD + xdp_headroom;
1990
1991 len -= vi->hdr_len;
1992 u64_stats_add(&stats->bytes, len);
1993
1994 if (unlikely(len > GOOD_PACKET_LEN)) {
1995 pr_debug("%s: rx error: len %u exceeds max size %d\n",
1996 dev->name, len, GOOD_PACKET_LEN);
1997 DEV_STATS_INC(dev, rx_length_errors);
1998 goto err;
1999 }
2000
2001 if (unlikely(vi->xdp_enabled)) {
2002 struct bpf_prog *xdp_prog;
2003
2004 rcu_read_lock();
2005 xdp_prog = rcu_dereference(rq->xdp_prog);
2006 if (xdp_prog) {
2007 skb = receive_small_xdp(dev, vi, rq, xdp_prog, buf,
2008 xdp_headroom, len, xdp_xmit,
2009 stats);
2010 rcu_read_unlock();
2011 return skb;
2012 }
2013 rcu_read_unlock();
2014 }
2015
2016 skb = receive_small_build_skb(vi, xdp_headroom, buf, len);
2017 if (likely(skb))
2018 return skb;
2019
2020 err:
2021 u64_stats_inc(&stats->drops);
2022 put_page(page);
2023 return NULL;
2024 }
2025
2026 static struct sk_buff *receive_big(struct net_device *dev,
2027 struct virtnet_info *vi,
2028 struct receive_queue *rq,
2029 void *buf,
2030 unsigned int len,
2031 struct virtnet_rq_stats *stats)
2032 {
2033 struct page *page = buf;
2034 struct sk_buff *skb =
2035 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0);
2036
2037 u64_stats_add(&stats->bytes, len - vi->hdr_len);
2038 if (unlikely(!skb))
2039 goto err;
2040
2041 return skb;
2042
2043 err:
2044 u64_stats_inc(&stats->drops);
2045 give_pages(rq, page);
2046 return NULL;
2047 }
2048
2049 static void mergeable_buf_free(struct receive_queue *rq, int num_buf,
2050 struct net_device *dev,
2051 struct virtnet_rq_stats *stats)
2052 {
2053 struct page *page;
2054 void *buf;
2055 int len;
2056
2057 while (num_buf-- > 1) {
2058 buf = virtnet_rq_get_buf(rq, &len, NULL);
2059 if (unlikely(!buf)) {
2060 pr_debug("%s: rx error: %d buffers missing\n",
2061 dev->name, num_buf);
2062 DEV_STATS_INC(dev, rx_length_errors);
2063 break;
2064 }
2065 u64_stats_add(&stats->bytes, len);
2066 page = virt_to_head_page(buf);
2067 put_page(page);
2068 }
2069 }
2070
2071 /* Why not use xdp_build_skb_from_frame() ?
2072 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in
2073 * virtio-net there are 2 points that do not match its requirements:
2074 * 1. The size of the prefilled buffer is not fixed before xdp is set.
2075 * 2. xdp_build_skb_from_frame() does more checks that we don't need,
2076 * like eth_type_trans() (which virtio-net does in receive_buf()).
2077 */
2078 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev,
2079 struct virtnet_info *vi,
2080 struct xdp_buff *xdp,
2081 unsigned int xdp_frags_truesz)
2082 {
2083 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
2084 unsigned int headroom, data_len;
2085 struct sk_buff *skb;
2086 int metasize;
2087 u8 nr_frags;
2088
2089 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) {
2090 pr_debug("Error building skb as missing reserved tailroom for xdp");
2091 return NULL;
2092 }
2093
2094 if (unlikely(xdp_buff_has_frags(xdp)))
2095 nr_frags = sinfo->nr_frags;
2096
2097 skb = build_skb(xdp->data_hard_start, xdp->frame_sz);
2098 if (unlikely(!skb))
2099 return NULL;
2100
2101 headroom = xdp->data - xdp->data_hard_start;
2102 data_len = xdp->data_end - xdp->data;
2103 skb_reserve(skb, headroom);
2104 __skb_put(skb, data_len);
2105
2106 metasize = xdp->data - xdp->data_meta;
2107 metasize = metasize > 0 ? metasize : 0;
2108 if (metasize)
2109 skb_metadata_set(skb, metasize);
2110
2111 if (unlikely(xdp_buff_has_frags(xdp)))
2112 xdp_update_skb_shared_info(skb, nr_frags,
2113 sinfo->xdp_frags_size,
2114 xdp_frags_truesz,
2115 xdp_buff_is_frag_pfmemalloc(xdp));
2116
2117 return skb;
2118 }
2119
2120 /* TODO: build xdp in big mode */
2121 static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
2122 struct virtnet_info *vi,
2123 struct receive_queue *rq,
2124 struct xdp_buff *xdp,
2125 void *buf,
2126 unsigned int len,
2127 unsigned int frame_sz,
2128 int *num_buf,
2129 unsigned int *xdp_frags_truesize,
2130 struct virtnet_rq_stats *stats)
2131 {
2132 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
2133 unsigned int headroom, tailroom, room;
2134 unsigned int truesize, cur_frag_size;
2135 struct skb_shared_info *shinfo;
2136 unsigned int xdp_frags_truesz = 0;
2137 struct page *page;
2138 skb_frag_t *frag;
2139 int offset;
2140 void *ctx;
2141
2142 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq);
2143 xdp_prepare_buff(xdp, buf - XDP_PACKET_HEADROOM,
2144 XDP_PACKET_HEADROOM + vi->hdr_len, len - vi->hdr_len, true);
2145
2146 if (!*num_buf)
2147 return 0;
2148
2149 if (*num_buf > 1) {
2150 /* If we want to build multi-buffer xdp, we need
2151 * to specify that the flags of xdp_buff have the
2152 * XDP_FLAGS_HAS_FRAG bit.
2153 */
2154 if (!xdp_buff_has_frags(xdp))
2155 xdp_buff_set_frags_flag(xdp);
2156
2157 shinfo = xdp_get_shared_info_from_buff(xdp);
2158 shinfo->nr_frags = 0;
2159 shinfo->xdp_frags_size = 0;
2160 }
2161
2162 if (*num_buf > MAX_SKB_FRAGS + 1)
2163 return -EINVAL;
2164
2165 while (--*num_buf > 0) {
2166 buf = virtnet_rq_get_buf(rq, &len, &ctx);
2167 if (unlikely(!buf)) {
2168 pr_debug("%s: rx error: %d buffers out of %d missing\n",
2169 dev->name, *num_buf,
2170 virtio16_to_cpu(vi->vdev, hdr->num_buffers));
2171 DEV_STATS_INC(dev, rx_length_errors);
2172 goto err;
2173 }
2174
2175 u64_stats_add(&stats->bytes, len);
2176 page = virt_to_head_page(buf);
2177 offset = buf - page_address(page);
2178
2179 truesize = mergeable_ctx_to_truesize(ctx);
2180 headroom = mergeable_ctx_to_headroom(ctx);
2181 tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2182 room = SKB_DATA_ALIGN(headroom + tailroom);
2183
2184 cur_frag_size = truesize;
2185 xdp_frags_truesz += cur_frag_size;
2186 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) {
2187 put_page(page);
2188 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
2189 dev->name, len, (unsigned long)(truesize - room));
2190 DEV_STATS_INC(dev, rx_length_errors);
2191 goto err;
2192 }
2193
2194 frag = &shinfo->frags[shinfo->nr_frags++];
2195 skb_frag_fill_page_desc(frag, page, offset, len);
2196 if (page_is_pfmemalloc(page))
2197 xdp_buff_set_frag_pfmemalloc(xdp);
2198
2199 shinfo->xdp_frags_size += len;
2200 }
2201
2202 *xdp_frags_truesize = xdp_frags_truesz;
2203 return 0;
2204
2205 err:
2206 put_xdp_frags(xdp);
2207 return -EINVAL;
2208 }
2209
2210 static void *mergeable_xdp_get_buf(struct virtnet_info *vi,
2211 struct receive_queue *rq,
2212 struct bpf_prog *xdp_prog,
2213 void *ctx,
2214 unsigned int *frame_sz,
2215 int *num_buf,
2216 struct page **page,
2217 int offset,
2218 unsigned int *len,
2219 struct virtio_net_hdr_mrg_rxbuf *hdr)
2220 {
2221 unsigned int truesize = mergeable_ctx_to_truesize(ctx);
2222 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
2223 struct page *xdp_page;
2224 unsigned int xdp_room;
2225
2226 /* Transient failure which in theory could occur if
2227 * in-flight packets from before XDP was enabled reach
2228 * the receive path after XDP is loaded.
2229 */
2230 if (unlikely(hdr->hdr.gso_type))
2231 return NULL;
2232
2233 /* Partially checksummed packets must be dropped. */
2234 if (unlikely(hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM))
2235 return NULL;
2236
2237 /* Now XDP core assumes frag size is PAGE_SIZE, but buffers
2238 * with headroom may add hole in truesize, which
2239 * make their length exceed PAGE_SIZE. So we disabled the
2240 * hole mechanism for xdp. See add_recvbuf_mergeable().
2241 */
2242 *frame_sz = truesize;
2243
2244 if (likely(headroom >= virtnet_get_headroom(vi) &&
2245 (*num_buf == 1 || xdp_prog->aux->xdp_has_frags))) {
2246 return page_address(*page) + offset;
2247 }
2248
2249 /* This happens when headroom is not enough because
2250 * of the buffer was prefilled before XDP is set.
2251 * This should only happen for the first several packets.
2252 * In fact, vq reset can be used here to help us clean up
2253 * the prefilled buffers, but many existing devices do not
2254 * support it, and we don't want to bother users who are
2255 * using xdp normally.
2256 */
2257 if (!xdp_prog->aux->xdp_has_frags) {
2258 /* linearize data for XDP */
2259 xdp_page = xdp_linearize_page(rq, num_buf,
2260 *page, offset,
2261 XDP_PACKET_HEADROOM,
2262 len);
2263 if (!xdp_page)
2264 return NULL;
2265 } else {
2266 xdp_room = SKB_DATA_ALIGN(XDP_PACKET_HEADROOM +
2267 sizeof(struct skb_shared_info));
2268 if (*len + xdp_room > PAGE_SIZE)
2269 return NULL;
2270
2271 xdp_page = alloc_page(GFP_ATOMIC);
2272 if (!xdp_page)
2273 return NULL;
2274
2275 memcpy(page_address(xdp_page) + XDP_PACKET_HEADROOM,
2276 page_address(*page) + offset, *len);
2277 }
2278
2279 *frame_sz = PAGE_SIZE;
2280
2281 put_page(*page);
2282
2283 *page = xdp_page;
2284
2285 return page_address(*page) + XDP_PACKET_HEADROOM;
2286 }
2287
2288 static struct sk_buff *receive_mergeable_xdp(struct net_device *dev,
2289 struct virtnet_info *vi,
2290 struct receive_queue *rq,
2291 struct bpf_prog *xdp_prog,
2292 void *buf,
2293 void *ctx,
2294 unsigned int len,
2295 unsigned int *xdp_xmit,
2296 struct virtnet_rq_stats *stats)
2297 {
2298 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
2299 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
2300 struct page *page = virt_to_head_page(buf);
2301 int offset = buf - page_address(page);
2302 unsigned int xdp_frags_truesz = 0;
2303 struct sk_buff *head_skb;
2304 unsigned int frame_sz;
2305 struct xdp_buff xdp;
2306 void *data;
2307 u32 act;
2308 int err;
2309
2310 data = mergeable_xdp_get_buf(vi, rq, xdp_prog, ctx, &frame_sz, &num_buf, &page,
2311 offset, &len, hdr);
2312 if (unlikely(!data))
2313 goto err_xdp;
2314
2315 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz,
2316 &num_buf, &xdp_frags_truesz, stats);
2317 if (unlikely(err))
2318 goto err_xdp;
2319
2320 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
2321
2322 switch (act) {
2323 case XDP_PASS:
2324 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
2325 if (unlikely(!head_skb))
2326 break;
2327 return head_skb;
2328
2329 case XDP_TX:
2330 case XDP_REDIRECT:
2331 return NULL;
2332
2333 default:
2334 break;
2335 }
2336
2337 put_xdp_frags(&xdp);
2338
2339 err_xdp:
2340 put_page(page);
2341 mergeable_buf_free(rq, num_buf, dev, stats);
2342
2343 u64_stats_inc(&stats->xdp_drops);
2344 u64_stats_inc(&stats->drops);
2345 return NULL;
2346 }
2347
2348 static struct sk_buff *virtnet_skb_append_frag(struct sk_buff *head_skb,
2349 struct sk_buff *curr_skb,
2350 struct page *page, void *buf,
2351 int len, int truesize)
2352 {
2353 int num_skb_frags;
2354 int offset;
2355
2356 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
2357 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
2358 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
2359
2360 if (unlikely(!nskb))
2361 return NULL;
2362
2363 if (curr_skb == head_skb)
2364 skb_shinfo(curr_skb)->frag_list = nskb;
2365 else
2366 curr_skb->next = nskb;
2367 curr_skb = nskb;
2368 head_skb->truesize += nskb->truesize;
2369 num_skb_frags = 0;
2370 }
2371
2372 if (curr_skb != head_skb) {
2373 head_skb->data_len += len;
2374 head_skb->len += len;
2375 head_skb->truesize += truesize;
2376 }
2377
2378 offset = buf - page_address(page);
2379 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
2380 put_page(page);
2381 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
2382 len, truesize);
2383 } else {
2384 skb_add_rx_frag(curr_skb, num_skb_frags, page,
2385 offset, len, truesize);
2386 }
2387
2388 return curr_skb;
2389 }
2390
2391 static struct sk_buff *receive_mergeable(struct net_device *dev,
2392 struct virtnet_info *vi,
2393 struct receive_queue *rq,
2394 void *buf,
2395 void *ctx,
2396 unsigned int len,
2397 unsigned int *xdp_xmit,
2398 struct virtnet_rq_stats *stats)
2399 {
2400 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
2401 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
2402 struct page *page = virt_to_head_page(buf);
2403 int offset = buf - page_address(page);
2404 struct sk_buff *head_skb, *curr_skb;
2405 unsigned int truesize = mergeable_ctx_to_truesize(ctx);
2406 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
2407 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2408 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
2409
2410 head_skb = NULL;
2411 u64_stats_add(&stats->bytes, len - vi->hdr_len);
2412
2413 if (unlikely(len > truesize - room)) {
2414 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
2415 dev->name, len, (unsigned long)(truesize - room));
2416 DEV_STATS_INC(dev, rx_length_errors);
2417 goto err_skb;
2418 }
2419
2420 if (unlikely(vi->xdp_enabled)) {
2421 struct bpf_prog *xdp_prog;
2422
2423 rcu_read_lock();
2424 xdp_prog = rcu_dereference(rq->xdp_prog);
2425 if (xdp_prog) {
2426 head_skb = receive_mergeable_xdp(dev, vi, rq, xdp_prog, buf, ctx,
2427 len, xdp_xmit, stats);
2428 rcu_read_unlock();
2429 return head_skb;
2430 }
2431 rcu_read_unlock();
2432 }
2433
2434 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom);
2435 curr_skb = head_skb;
2436
2437 if (unlikely(!curr_skb))
2438 goto err_skb;
2439 while (--num_buf) {
2440 buf = virtnet_rq_get_buf(rq, &len, &ctx);
2441 if (unlikely(!buf)) {
2442 pr_debug("%s: rx error: %d buffers out of %d missing\n",
2443 dev->name, num_buf,
2444 virtio16_to_cpu(vi->vdev,
2445 hdr->num_buffers));
2446 DEV_STATS_INC(dev, rx_length_errors);
2447 goto err_buf;
2448 }
2449
2450 u64_stats_add(&stats->bytes, len);
2451 page = virt_to_head_page(buf);
2452
2453 truesize = mergeable_ctx_to_truesize(ctx);
2454 headroom = mergeable_ctx_to_headroom(ctx);
2455 tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2456 room = SKB_DATA_ALIGN(headroom + tailroom);
2457 if (unlikely(len > truesize - room)) {
2458 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
2459 dev->name, len, (unsigned long)(truesize - room));
2460 DEV_STATS_INC(dev, rx_length_errors);
2461 goto err_skb;
2462 }
2463
2464 curr_skb = virtnet_skb_append_frag(head_skb, curr_skb, page,
2465 buf, len, truesize);
2466 if (!curr_skb)
2467 goto err_skb;
2468 }
2469
2470 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
2471 return head_skb;
2472
2473 err_skb:
2474 put_page(page);
2475 mergeable_buf_free(rq, num_buf, dev, stats);
2476
2477 err_buf:
2478 u64_stats_inc(&stats->drops);
2479 dev_kfree_skb(head_skb);
2480 return NULL;
2481 }
2482
2483 static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
2484 struct sk_buff *skb)
2485 {
2486 enum pkt_hash_types rss_hash_type;
2487
2488 if (!hdr_hash || !skb)
2489 return;
2490
2491 switch (__le16_to_cpu(hdr_hash->hash_report)) {
2492 case VIRTIO_NET_HASH_REPORT_TCPv4:
2493 case VIRTIO_NET_HASH_REPORT_UDPv4:
2494 case VIRTIO_NET_HASH_REPORT_TCPv6:
2495 case VIRTIO_NET_HASH_REPORT_UDPv6:
2496 case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
2497 case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
2498 rss_hash_type = PKT_HASH_TYPE_L4;
2499 break;
2500 case VIRTIO_NET_HASH_REPORT_IPv4:
2501 case VIRTIO_NET_HASH_REPORT_IPv6:
2502 case VIRTIO_NET_HASH_REPORT_IPv6_EX:
2503 rss_hash_type = PKT_HASH_TYPE_L3;
2504 break;
2505 case VIRTIO_NET_HASH_REPORT_NONE:
2506 default:
2507 rss_hash_type = PKT_HASH_TYPE_NONE;
2508 }
2509 skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type);
2510 }
2511
2512 static void virtnet_receive_done(struct virtnet_info *vi, struct receive_queue *rq,
2513 struct sk_buff *skb, u8 flags)
2514 {
2515 struct virtio_net_common_hdr *hdr;
2516 struct net_device *dev = vi->dev;
2517
2518 hdr = skb_vnet_common_hdr(skb);
2519 if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report)
2520 virtio_skb_set_hash(&hdr->hash_v1_hdr, skb);
2521
2522 if (flags & VIRTIO_NET_HDR_F_DATA_VALID)
2523 skb->ip_summed = CHECKSUM_UNNECESSARY;
2524
2525 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
2526 virtio_is_little_endian(vi->vdev))) {
2527 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
2528 dev->name, hdr->hdr.gso_type,
2529 hdr->hdr.gso_size);
2530 goto frame_err;
2531 }
2532
2533 skb_record_rx_queue(skb, vq2rxq(rq->vq));
2534 skb->protocol = eth_type_trans(skb, dev);
2535 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
2536 ntohs(skb->protocol), skb->len, skb->pkt_type);
2537
2538 napi_gro_receive(&rq->napi, skb);
2539 return;
2540
2541 frame_err:
2542 DEV_STATS_INC(dev, rx_frame_errors);
2543 dev_kfree_skb(skb);
2544 }
2545
2546 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
2547 void *buf, unsigned int len, void **ctx,
2548 unsigned int *xdp_xmit,
2549 struct virtnet_rq_stats *stats)
2550 {
2551 struct net_device *dev = vi->dev;
2552 struct sk_buff *skb;
2553 u8 flags;
2554
2555 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
2556 pr_debug("%s: short packet %i\n", dev->name, len);
2557 DEV_STATS_INC(dev, rx_length_errors);
2558 virtnet_rq_free_buf(vi, rq, buf);
2559 return;
2560 }
2561
2562 /* 1. Save the flags early, as the XDP program might overwrite them.
2563 * These flags ensure packets marked as VIRTIO_NET_HDR_F_DATA_VALID
2564 * stay valid after XDP processing.
2565 * 2. XDP doesn't work with partially checksummed packets (refer to
2566 * virtnet_xdp_set()), so packets marked as
2567 * VIRTIO_NET_HDR_F_NEEDS_CSUM get dropped during XDP processing.
2568 */
2569 flags = ((struct virtio_net_common_hdr *)buf)->hdr.flags;
2570
2571 if (vi->mergeable_rx_bufs)
2572 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
2573 stats);
2574 else if (vi->big_packets)
2575 skb = receive_big(dev, vi, rq, buf, len, stats);
2576 else
2577 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
2578
2579 if (unlikely(!skb))
2580 return;
2581
2582 virtnet_receive_done(vi, rq, skb, flags);
2583 }
2584
2585 /* Unlike mergeable buffers, all buffers are allocated to the
2586 * same size, except for the headroom. For this reason we do
2587 * not need to use mergeable_len_to_ctx here - it is enough
2588 * to store the headroom as the context ignoring the truesize.
2589 */
2590 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
2591 gfp_t gfp)
2592 {
2593 char *buf;
2594 unsigned int xdp_headroom = virtnet_get_headroom(vi);
2595 void *ctx = (void *)(unsigned long)xdp_headroom;
2596 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
2597 int err;
2598
2599 len = SKB_DATA_ALIGN(len) +
2600 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
2601
2602 if (unlikely(!skb_page_frag_refill(len, &rq->alloc_frag, gfp)))
2603 return -ENOMEM;
2604
2605 buf = virtnet_rq_alloc(rq, len, gfp);
2606 if (unlikely(!buf))
2607 return -ENOMEM;
2608
2609 buf += VIRTNET_RX_PAD + xdp_headroom;
2610
2611 virtnet_rq_init_one_sg(rq, buf, vi->hdr_len + GOOD_PACKET_LEN);
2612
2613 err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, buf, ctx, gfp);
2614 if (err < 0) {
2615 virtnet_rq_unmap(rq, buf, 0);
2616 put_page(virt_to_head_page(buf));
2617 }
2618
2619 return err;
2620 }
2621
2622 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
2623 gfp_t gfp)
2624 {
2625 struct page *first, *list = NULL;
2626 char *p;
2627 int i, err, offset;
2628
2629 sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2);
2630
2631 /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */
2632 for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) {
2633 first = get_a_page(rq, gfp);
2634 if (!first) {
2635 if (list)
2636 give_pages(rq, list);
2637 return -ENOMEM;
2638 }
2639 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
2640
2641 /* chain new page in list head to match sg */
2642 first->private = (unsigned long)list;
2643 list = first;
2644 }
2645
2646 first = get_a_page(rq, gfp);
2647 if (!first) {
2648 give_pages(rq, list);
2649 return -ENOMEM;
2650 }
2651 p = page_address(first);
2652
2653 /* rq->sg[0], rq->sg[1] share the same page */
2654 /* a separated rq->sg[0] for header - required in case !any_header_sg */
2655 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
2656
2657 /* rq->sg[1] for data packet, from offset */
2658 offset = sizeof(struct padded_vnet_hdr);
2659 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
2660
2661 /* chain first in list head */
2662 first->private = (unsigned long)list;
2663 err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2,
2664 first, gfp);
2665 if (err < 0)
2666 give_pages(rq, first);
2667
2668 return err;
2669 }
2670
2671 static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
2672 struct ewma_pkt_len *avg_pkt_len,
2673 unsigned int room)
2674 {
2675 struct virtnet_info *vi = rq->vq->vdev->priv;
2676 const size_t hdr_len = vi->hdr_len;
2677 unsigned int len;
2678
2679 if (room)
2680 return PAGE_SIZE - room;
2681
2682 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
2683 rq->min_buf_len, PAGE_SIZE - hdr_len);
2684
2685 return ALIGN(len, L1_CACHE_BYTES);
2686 }
2687
2688 static int add_recvbuf_mergeable(struct virtnet_info *vi,
2689 struct receive_queue *rq, gfp_t gfp)
2690 {
2691 struct page_frag *alloc_frag = &rq->alloc_frag;
2692 unsigned int headroom = virtnet_get_headroom(vi);
2693 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2694 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
2695 unsigned int len, hole;
2696 void *ctx;
2697 char *buf;
2698 int err;
2699
2700 /* Extra tailroom is needed to satisfy XDP's assumption. This
2701 * means rx frags coalescing won't work, but consider we've
2702 * disabled GSO for XDP, it won't be a big issue.
2703 */
2704 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
2705
2706 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
2707 return -ENOMEM;
2708
2709 if (!alloc_frag->offset && len + room + sizeof(struct virtnet_rq_dma) > alloc_frag->size)
2710 len -= sizeof(struct virtnet_rq_dma);
2711
2712 buf = virtnet_rq_alloc(rq, len + room, gfp);
2713 if (unlikely(!buf))
2714 return -ENOMEM;
2715
2716 buf += headroom; /* advance address leaving hole at front of pkt */
2717 hole = alloc_frag->size - alloc_frag->offset;
2718 if (hole < len + room) {
2719 /* To avoid internal fragmentation, if there is very likely not
2720 * enough space for another buffer, add the remaining space to
2721 * the current buffer.
2722 * XDP core assumes that frame_size of xdp_buff and the length
2723 * of the frag are PAGE_SIZE, so we disable the hole mechanism.
2724 */
2725 if (!headroom)
2726 len += hole;
2727 alloc_frag->offset += hole;
2728 }
2729
2730 virtnet_rq_init_one_sg(rq, buf, len);
2731
2732 ctx = mergeable_len_to_ctx(len + room, headroom);
2733 err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, buf, ctx, gfp);
2734 if (err < 0) {
2735 virtnet_rq_unmap(rq, buf, 0);
2736 put_page(virt_to_head_page(buf));
2737 }
2738
2739 return err;
2740 }
2741
2742 /*
2743 * Returns false if we couldn't fill entirely (OOM).
2744 *
2745 * Normally run in the receive path, but can also be run from ndo_open
2746 * before we're receiving packets, or from refill_work which is
2747 * careful to disable receiving (using napi_disable).
2748 */
2749 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
2750 gfp_t gfp)
2751 {
2752 int err;
2753
2754 if (rq->xsk_pool) {
2755 err = virtnet_add_recvbuf_xsk(vi, rq, rq->xsk_pool, gfp);
2756 goto kick;
2757 }
2758
2759 do {
2760 if (vi->mergeable_rx_bufs)
2761 err = add_recvbuf_mergeable(vi, rq, gfp);
2762 else if (vi->big_packets)
2763 err = add_recvbuf_big(vi, rq, gfp);
2764 else
2765 err = add_recvbuf_small(vi, rq, gfp);
2766
2767 if (err)
2768 break;
2769 } while (rq->vq->num_free);
2770
2771 kick:
2772 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
2773 unsigned long flags;
2774
2775 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
2776 u64_stats_inc(&rq->stats.kicks);
2777 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
2778 }
2779
2780 return err != -ENOMEM;
2781 }
2782
2783 static void skb_recv_done(struct virtqueue *rvq)
2784 {
2785 struct virtnet_info *vi = rvq->vdev->priv;
2786 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
2787
2788 rq->calls++;
2789 virtqueue_napi_schedule(&rq->napi, rvq);
2790 }
2791
2792 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
2793 {
2794 napi_enable(napi);
2795
2796 /* If all buffers were filled by other side before we napi_enabled, we
2797 * won't get another interrupt, so process any outstanding packets now.
2798 * Call local_bh_enable after to trigger softIRQ processing.
2799 */
2800 local_bh_disable();
2801 virtqueue_napi_schedule(napi, vq);
2802 local_bh_enable();
2803 }
2804
2805 static void virtnet_napi_tx_enable(struct virtnet_info *vi,
2806 struct virtqueue *vq,
2807 struct napi_struct *napi)
2808 {
2809 if (!napi->weight)
2810 return;
2811
2812 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only
2813 * enable the feature if this is likely affine with the transmit path.
2814 */
2815 if (!vi->affinity_hint_set) {
2816 napi->weight = 0;
2817 return;
2818 }
2819
2820 return virtnet_napi_enable(vq, napi);
2821 }
2822
2823 static void virtnet_napi_tx_disable(struct napi_struct *napi)
2824 {
2825 if (napi->weight)
2826 napi_disable(napi);
2827 }
2828
2829 static void refill_work(struct work_struct *work)
2830 {
2831 struct virtnet_info *vi =
2832 container_of(work, struct virtnet_info, refill.work);
2833 bool still_empty;
2834 int i;
2835
2836 for (i = 0; i < vi->curr_queue_pairs; i++) {
2837 struct receive_queue *rq = &vi->rq[i];
2838
2839 napi_disable(&rq->napi);
2840 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
2841 virtnet_napi_enable(rq->vq, &rq->napi);
2842
2843 /* In theory, this can happen: if we don't get any buffers in
2844 * we will *never* try to fill again.
2845 */
2846 if (still_empty)
2847 schedule_delayed_work(&vi->refill, HZ/2);
2848 }
2849 }
2850
2851 static int virtnet_receive_xsk_bufs(struct virtnet_info *vi,
2852 struct receive_queue *rq,
2853 int budget,
2854 unsigned int *xdp_xmit,
2855 struct virtnet_rq_stats *stats)
2856 {
2857 unsigned int len;
2858 int packets = 0;
2859 void *buf;
2860
2861 while (packets < budget) {
2862 buf = virtqueue_get_buf(rq->vq, &len);
2863 if (!buf)
2864 break;
2865
2866 virtnet_receive_xsk_buf(vi, rq, buf, len, xdp_xmit, stats);
2867 packets++;
2868 }
2869
2870 return packets;
2871 }
2872
2873 static int virtnet_receive_packets(struct virtnet_info *vi,
2874 struct receive_queue *rq,
2875 int budget,
2876 unsigned int *xdp_xmit,
2877 struct virtnet_rq_stats *stats)
2878 {
2879 unsigned int len;
2880 int packets = 0;
2881 void *buf;
2882
2883 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2884 void *ctx;
2885 while (packets < budget &&
2886 (buf = virtnet_rq_get_buf(rq, &len, &ctx))) {
2887 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, stats);
2888 packets++;
2889 }
2890 } else {
2891 while (packets < budget &&
2892 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
2893 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, stats);
2894 packets++;
2895 }
2896 }
2897
2898 return packets;
2899 }
2900
2901 static int virtnet_receive(struct receive_queue *rq, int budget,
2902 unsigned int *xdp_xmit)
2903 {
2904 struct virtnet_info *vi = rq->vq->vdev->priv;
2905 struct virtnet_rq_stats stats = {};
2906 int i, packets;
2907
2908 if (rq->xsk_pool)
2909 packets = virtnet_receive_xsk_bufs(vi, rq, budget, xdp_xmit, &stats);
2910 else
2911 packets = virtnet_receive_packets(vi, rq, budget, xdp_xmit, &stats);
2912
2913 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
2914 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) {
2915 spin_lock(&vi->refill_lock);
2916 if (vi->refill_enabled)
2917 schedule_delayed_work(&vi->refill, 0);
2918 spin_unlock(&vi->refill_lock);
2919 }
2920 }
2921
2922 u64_stats_set(&stats.packets, packets);
2923 u64_stats_update_begin(&rq->stats.syncp);
2924 for (i = 0; i < ARRAY_SIZE(virtnet_rq_stats_desc); i++) {
2925 size_t offset = virtnet_rq_stats_desc[i].offset;
2926 u64_stats_t *item, *src;
2927
2928 item = (u64_stats_t *)((u8 *)&rq->stats + offset);
2929 src = (u64_stats_t *)((u8 *)&stats + offset);
2930 u64_stats_add(item, u64_stats_read(src));
2931 }
2932
2933 u64_stats_add(&rq->stats.packets, u64_stats_read(&stats.packets));
2934 u64_stats_add(&rq->stats.bytes, u64_stats_read(&stats.bytes));
2935
2936 u64_stats_update_end(&rq->stats.syncp);
2937
2938 return packets;
2939 }
2940
2941 static void virtnet_poll_cleantx(struct receive_queue *rq, int budget)
2942 {
2943 struct virtnet_info *vi = rq->vq->vdev->priv;
2944 unsigned int index = vq2rxq(rq->vq);
2945 struct send_queue *sq = &vi->sq[index];
2946 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
2947
2948 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index))
2949 return;
2950
2951 if (__netif_tx_trylock(txq)) {
2952 if (sq->reset) {
2953 __netif_tx_unlock(txq);
2954 return;
2955 }
2956
2957 do {
2958 virtqueue_disable_cb(sq->vq);
2959 free_old_xmit(sq, txq, !!budget);
2960 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
2961
2962 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
2963 if (netif_tx_queue_stopped(txq)) {
2964 u64_stats_update_begin(&sq->stats.syncp);
2965 u64_stats_inc(&sq->stats.wake);
2966 u64_stats_update_end(&sq->stats.syncp);
2967 }
2968 netif_tx_wake_queue(txq);
2969 }
2970
2971 __netif_tx_unlock(txq);
2972 }
2973 }
2974
2975 static void virtnet_rx_dim_update(struct virtnet_info *vi, struct receive_queue *rq)
2976 {
2977 struct dim_sample cur_sample = {};
2978
2979 if (!rq->packets_in_napi)
2980 return;
2981
2982 /* Don't need protection when fetching stats, since fetcher and
2983 * updater of the stats are in same context
2984 */
2985 dim_update_sample(rq->calls,
2986 u64_stats_read(&rq->stats.packets),
2987 u64_stats_read(&rq->stats.bytes),
2988 &cur_sample);
2989
2990 net_dim(&rq->dim, &cur_sample);
2991 rq->packets_in_napi = 0;
2992 }
2993
2994 static int virtnet_poll(struct napi_struct *napi, int budget)
2995 {
2996 struct receive_queue *rq =
2997 container_of(napi, struct receive_queue, napi);
2998 struct virtnet_info *vi = rq->vq->vdev->priv;
2999 struct send_queue *sq;
3000 unsigned int received;
3001 unsigned int xdp_xmit = 0;
3002 bool napi_complete;
3003
3004 virtnet_poll_cleantx(rq, budget);
3005
3006 received = virtnet_receive(rq, budget, &xdp_xmit);
3007 rq->packets_in_napi += received;
3008
3009 if (xdp_xmit & VIRTIO_XDP_REDIR)
3010 xdp_do_flush();
3011
3012 /* Out of packets? */
3013 if (received < budget) {
3014 napi_complete = virtqueue_napi_complete(napi, rq->vq, received);
3015 /* Intentionally not taking dim_lock here. This may result in a
3016 * spurious net_dim call. But if that happens virtnet_rx_dim_work
3017 * will not act on the scheduled work.
3018 */
3019 if (napi_complete && rq->dim_enabled)
3020 virtnet_rx_dim_update(vi, rq);
3021 }
3022
3023 if (xdp_xmit & VIRTIO_XDP_TX) {
3024 sq = virtnet_xdp_get_sq(vi);
3025 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
3026 u64_stats_update_begin(&sq->stats.syncp);
3027 u64_stats_inc(&sq->stats.kicks);
3028 u64_stats_update_end(&sq->stats.syncp);
3029 }
3030 virtnet_xdp_put_sq(vi, sq);
3031 }
3032
3033 return received;
3034 }
3035
3036 static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
3037 {
3038 virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
3039 napi_disable(&vi->rq[qp_index].napi);
3040 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
3041 }
3042
3043 static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
3044 {
3045 struct net_device *dev = vi->dev;
3046 int err;
3047
3048 err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
3049 vi->rq[qp_index].napi.napi_id);
3050 if (err < 0)
3051 return err;
3052
3053 err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
3054 MEM_TYPE_PAGE_SHARED, NULL);
3055 if (err < 0)
3056 goto err_xdp_reg_mem_model;
3057
3058 virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
3059 virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
3060
3061 return 0;
3062
3063 err_xdp_reg_mem_model:
3064 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
3065 return err;
3066 }
3067
3068 static void virtnet_cancel_dim(struct virtnet_info *vi, struct dim *dim)
3069 {
3070 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3071 return;
3072 net_dim_work_cancel(dim);
3073 }
3074
3075 static void virtnet_update_settings(struct virtnet_info *vi)
3076 {
3077 u32 speed;
3078 u8 duplex;
3079
3080 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
3081 return;
3082
3083 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
3084
3085 if (ethtool_validate_speed(speed))
3086 vi->speed = speed;
3087
3088 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
3089
3090 if (ethtool_validate_duplex(duplex))
3091 vi->duplex = duplex;
3092 }
3093
3094 static int virtnet_open(struct net_device *dev)
3095 {
3096 struct virtnet_info *vi = netdev_priv(dev);
3097 int i, err;
3098
3099 enable_delayed_refill(vi);
3100
3101 for (i = 0; i < vi->max_queue_pairs; i++) {
3102 if (i < vi->curr_queue_pairs)
3103 /* Make sure we have some buffers: if oom use wq. */
3104 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
3105 schedule_delayed_work(&vi->refill, 0);
3106
3107 err = virtnet_enable_queue_pair(vi, i);
3108 if (err < 0)
3109 goto err_enable_qp;
3110 }
3111
3112 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
3113 if (vi->status & VIRTIO_NET_S_LINK_UP)
3114 netif_carrier_on(vi->dev);
3115 virtio_config_driver_enable(vi->vdev);
3116 } else {
3117 vi->status = VIRTIO_NET_S_LINK_UP;
3118 netif_carrier_on(dev);
3119 }
3120
3121 return 0;
3122
3123 err_enable_qp:
3124 disable_delayed_refill(vi);
3125 cancel_delayed_work_sync(&vi->refill);
3126
3127 for (i--; i >= 0; i--) {
3128 virtnet_disable_queue_pair(vi, i);
3129 virtnet_cancel_dim(vi, &vi->rq[i].dim);
3130 }
3131
3132 return err;
3133 }
3134
3135 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
3136 {
3137 struct send_queue *sq = container_of(napi, struct send_queue, napi);
3138 struct virtnet_info *vi = sq->vq->vdev->priv;
3139 unsigned int index = vq2txq(sq->vq);
3140 struct netdev_queue *txq;
3141 int opaque, xsk_done = 0;
3142 bool done;
3143
3144 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
3145 /* We don't need to enable cb for XDP */
3146 napi_complete_done(napi, 0);
3147 return 0;
3148 }
3149
3150 txq = netdev_get_tx_queue(vi->dev, index);
3151 __netif_tx_lock(txq, raw_smp_processor_id());
3152 virtqueue_disable_cb(sq->vq);
3153
3154 if (sq->xsk_pool)
3155 xsk_done = virtnet_xsk_xmit(sq, sq->xsk_pool, budget);
3156 else
3157 free_old_xmit(sq, txq, !!budget);
3158
3159 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
3160 if (netif_tx_queue_stopped(txq)) {
3161 u64_stats_update_begin(&sq->stats.syncp);
3162 u64_stats_inc(&sq->stats.wake);
3163 u64_stats_update_end(&sq->stats.syncp);
3164 }
3165 netif_tx_wake_queue(txq);
3166 }
3167
3168 if (xsk_done >= budget) {
3169 __netif_tx_unlock(txq);
3170 return budget;
3171 }
3172
3173 opaque = virtqueue_enable_cb_prepare(sq->vq);
3174
3175 done = napi_complete_done(napi, 0);
3176
3177 if (!done)
3178 virtqueue_disable_cb(sq->vq);
3179
3180 __netif_tx_unlock(txq);
3181
3182 if (done) {
3183 if (unlikely(virtqueue_poll(sq->vq, opaque))) {
3184 if (napi_schedule_prep(napi)) {
3185 __netif_tx_lock(txq, raw_smp_processor_id());
3186 virtqueue_disable_cb(sq->vq);
3187 __netif_tx_unlock(txq);
3188 __napi_schedule(napi);
3189 }
3190 }
3191 }
3192
3193 return 0;
3194 }
3195
3196 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb, bool orphan)
3197 {
3198 struct virtio_net_hdr_mrg_rxbuf *hdr;
3199 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
3200 struct virtnet_info *vi = sq->vq->vdev->priv;
3201 int num_sg;
3202 unsigned hdr_len = vi->hdr_len;
3203 bool can_push;
3204
3205 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
3206
3207 can_push = vi->any_header_sg &&
3208 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
3209 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
3210 /* Even if we can, don't push here yet as this would skew
3211 * csum_start offset below. */
3212 if (can_push)
3213 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
3214 else
3215 hdr = &skb_vnet_common_hdr(skb)->mrg_hdr;
3216
3217 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
3218 virtio_is_little_endian(vi->vdev), false,
3219 0))
3220 return -EPROTO;
3221
3222 if (vi->mergeable_rx_bufs)
3223 hdr->num_buffers = 0;
3224
3225 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
3226 if (can_push) {
3227 __skb_push(skb, hdr_len);
3228 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
3229 if (unlikely(num_sg < 0))
3230 return num_sg;
3231 /* Pull header back to avoid skew in tx bytes calculations. */
3232 __skb_pull(skb, hdr_len);
3233 } else {
3234 sg_set_buf(sq->sg, hdr, hdr_len);
3235 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
3236 if (unlikely(num_sg < 0))
3237 return num_sg;
3238 num_sg++;
3239 }
3240
3241 return virtnet_add_outbuf(sq, num_sg, skb,
3242 orphan ? VIRTNET_XMIT_TYPE_SKB_ORPHAN : VIRTNET_XMIT_TYPE_SKB);
3243 }
3244
3245 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
3246 {
3247 struct virtnet_info *vi = netdev_priv(dev);
3248 int qnum = skb_get_queue_mapping(skb);
3249 struct send_queue *sq = &vi->sq[qnum];
3250 int err;
3251 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
3252 bool xmit_more = netdev_xmit_more();
3253 bool use_napi = sq->napi.weight;
3254 bool kick;
3255
3256 /* Free up any pending old buffers before queueing new ones. */
3257 do {
3258 if (use_napi)
3259 virtqueue_disable_cb(sq->vq);
3260
3261 free_old_xmit(sq, txq, false);
3262
3263 } while (use_napi && !xmit_more &&
3264 unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
3265
3266 /* timestamp packet in software */
3267 skb_tx_timestamp(skb);
3268
3269 /* Try to transmit */
3270 err = xmit_skb(sq, skb, !use_napi);
3271
3272 /* This should not happen! */
3273 if (unlikely(err)) {
3274 DEV_STATS_INC(dev, tx_fifo_errors);
3275 if (net_ratelimit())
3276 dev_warn(&dev->dev,
3277 "Unexpected TXQ (%d) queue failure: %d\n",
3278 qnum, err);
3279 DEV_STATS_INC(dev, tx_dropped);
3280 dev_kfree_skb_any(skb);
3281 return NETDEV_TX_OK;
3282 }
3283
3284 /* Don't wait up for transmitted skbs to be freed. */
3285 if (!use_napi) {
3286 skb_orphan(skb);
3287 nf_reset_ct(skb);
3288 }
3289
3290 check_sq_full_and_disable(vi, dev, sq);
3291
3292 kick = use_napi ? __netdev_tx_sent_queue(txq, skb->len, xmit_more) :
3293 !xmit_more || netif_xmit_stopped(txq);
3294 if (kick) {
3295 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
3296 u64_stats_update_begin(&sq->stats.syncp);
3297 u64_stats_inc(&sq->stats.kicks);
3298 u64_stats_update_end(&sq->stats.syncp);
3299 }
3300 }
3301
3302 return NETDEV_TX_OK;
3303 }
3304
3305 static void virtnet_rx_pause(struct virtnet_info *vi, struct receive_queue *rq)
3306 {
3307 bool running = netif_running(vi->dev);
3308
3309 if (running) {
3310 napi_disable(&rq->napi);
3311 virtnet_cancel_dim(vi, &rq->dim);
3312 }
3313 }
3314
3315 static void virtnet_rx_resume(struct virtnet_info *vi, struct receive_queue *rq)
3316 {
3317 bool running = netif_running(vi->dev);
3318
3319 if (!try_fill_recv(vi, rq, GFP_KERNEL))
3320 schedule_delayed_work(&vi->refill, 0);
3321
3322 if (running)
3323 virtnet_napi_enable(rq->vq, &rq->napi);
3324 }
3325
3326 static int virtnet_rx_resize(struct virtnet_info *vi,
3327 struct receive_queue *rq, u32 ring_num)
3328 {
3329 int err, qindex;
3330
3331 qindex = rq - vi->rq;
3332
3333 virtnet_rx_pause(vi, rq);
3334
3335 err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_unmap_free_buf, NULL);
3336 if (err)
3337 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err);
3338
3339 virtnet_rx_resume(vi, rq);
3340 return err;
3341 }
3342
3343 static void virtnet_tx_pause(struct virtnet_info *vi, struct send_queue *sq)
3344 {
3345 bool running = netif_running(vi->dev);
3346 struct netdev_queue *txq;
3347 int qindex;
3348
3349 qindex = sq - vi->sq;
3350
3351 if (running)
3352 virtnet_napi_tx_disable(&sq->napi);
3353
3354 txq = netdev_get_tx_queue(vi->dev, qindex);
3355
3356 /* 1. wait all ximt complete
3357 * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue()
3358 */
3359 __netif_tx_lock_bh(txq);
3360
3361 /* Prevent rx poll from accessing sq. */
3362 sq->reset = true;
3363
3364 /* Prevent the upper layer from trying to send packets. */
3365 netif_stop_subqueue(vi->dev, qindex);
3366
3367 __netif_tx_unlock_bh(txq);
3368 }
3369
3370 static void virtnet_tx_resume(struct virtnet_info *vi, struct send_queue *sq)
3371 {
3372 bool running = netif_running(vi->dev);
3373 struct netdev_queue *txq;
3374 int qindex;
3375
3376 qindex = sq - vi->sq;
3377
3378 txq = netdev_get_tx_queue(vi->dev, qindex);
3379
3380 __netif_tx_lock_bh(txq);
3381 sq->reset = false;
3382 netif_tx_wake_queue(txq);
3383 __netif_tx_unlock_bh(txq);
3384
3385 if (running)
3386 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi);
3387 }
3388
3389 static int virtnet_tx_resize(struct virtnet_info *vi, struct send_queue *sq,
3390 u32 ring_num)
3391 {
3392 int qindex, err;
3393
3394 qindex = sq - vi->sq;
3395
3396 virtnet_tx_pause(vi, sq);
3397
3398 err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf,
3399 virtnet_sq_free_unused_buf_done);
3400 if (err)
3401 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
3402
3403 virtnet_tx_resume(vi, sq);
3404
3405 return err;
3406 }
3407
3408 /*
3409 * Send command via the control virtqueue and check status. Commands
3410 * supported by the hypervisor, as indicated by feature bits, should
3411 * never fail unless improperly formatted.
3412 */
3413 static bool virtnet_send_command_reply(struct virtnet_info *vi, u8 class, u8 cmd,
3414 struct scatterlist *out,
3415 struct scatterlist *in)
3416 {
3417 struct scatterlist *sgs[5], hdr, stat;
3418 u32 out_num = 0, tmp, in_num = 0;
3419 bool ok;
3420 int ret;
3421
3422 /* Caller should know better */
3423 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
3424
3425 mutex_lock(&vi->cvq_lock);
3426 vi->ctrl->status = ~0;
3427 vi->ctrl->hdr.class = class;
3428 vi->ctrl->hdr.cmd = cmd;
3429 /* Add header */
3430 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
3431 sgs[out_num++] = &hdr;
3432
3433 if (out)
3434 sgs[out_num++] = out;
3435
3436 /* Add return status. */
3437 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
3438 sgs[out_num + in_num++] = &stat;
3439
3440 if (in)
3441 sgs[out_num + in_num++] = in;
3442
3443 BUG_ON(out_num + in_num > ARRAY_SIZE(sgs));
3444 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC);
3445 if (ret < 0) {
3446 dev_warn(&vi->vdev->dev,
3447 "Failed to add sgs for command vq: %d\n.", ret);
3448 mutex_unlock(&vi->cvq_lock);
3449 return false;
3450 }
3451
3452 if (unlikely(!virtqueue_kick(vi->cvq)))
3453 goto unlock;
3454
3455 /* Spin for a response, the kick causes an ioport write, trapping
3456 * into the hypervisor, so the request should be handled immediately.
3457 */
3458 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
3459 !virtqueue_is_broken(vi->cvq)) {
3460 cond_resched();
3461 cpu_relax();
3462 }
3463
3464 unlock:
3465 ok = vi->ctrl->status == VIRTIO_NET_OK;
3466 mutex_unlock(&vi->cvq_lock);
3467 return ok;
3468 }
3469
3470 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
3471 struct scatterlist *out)
3472 {
3473 return virtnet_send_command_reply(vi, class, cmd, out, NULL);
3474 }
3475
3476 static int virtnet_set_mac_address(struct net_device *dev, void *p)
3477 {
3478 struct virtnet_info *vi = netdev_priv(dev);
3479 struct virtio_device *vdev = vi->vdev;
3480 int ret;
3481 struct sockaddr *addr;
3482 struct scatterlist sg;
3483
3484 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
3485 return -EOPNOTSUPP;
3486
3487 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
3488 if (!addr)
3489 return -ENOMEM;
3490
3491 ret = eth_prepare_mac_addr_change(dev, addr);
3492 if (ret)
3493 goto out;
3494
3495 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
3496 sg_init_one(&sg, addr->sa_data, dev->addr_len);
3497 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
3498 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
3499 dev_warn(&vdev->dev,
3500 "Failed to set mac address by vq command.\n");
3501 ret = -EINVAL;
3502 goto out;
3503 }
3504 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
3505 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
3506 unsigned int i;
3507
3508 /* Naturally, this has an atomicity problem. */
3509 for (i = 0; i < dev->addr_len; i++)
3510 virtio_cwrite8(vdev,
3511 offsetof(struct virtio_net_config, mac) +
3512 i, addr->sa_data[i]);
3513 }
3514
3515 eth_commit_mac_addr_change(dev, p);
3516 ret = 0;
3517
3518 out:
3519 kfree(addr);
3520 return ret;
3521 }
3522
3523 static void virtnet_stats(struct net_device *dev,
3524 struct rtnl_link_stats64 *tot)
3525 {
3526 struct virtnet_info *vi = netdev_priv(dev);
3527 unsigned int start;
3528 int i;
3529
3530 for (i = 0; i < vi->max_queue_pairs; i++) {
3531 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops;
3532 struct receive_queue *rq = &vi->rq[i];
3533 struct send_queue *sq = &vi->sq[i];
3534
3535 do {
3536 start = u64_stats_fetch_begin(&sq->stats.syncp);
3537 tpackets = u64_stats_read(&sq->stats.packets);
3538 tbytes = u64_stats_read(&sq->stats.bytes);
3539 terrors = u64_stats_read(&sq->stats.tx_timeouts);
3540 } while (u64_stats_fetch_retry(&sq->stats.syncp, start));
3541
3542 do {
3543 start = u64_stats_fetch_begin(&rq->stats.syncp);
3544 rpackets = u64_stats_read(&rq->stats.packets);
3545 rbytes = u64_stats_read(&rq->stats.bytes);
3546 rdrops = u64_stats_read(&rq->stats.drops);
3547 } while (u64_stats_fetch_retry(&rq->stats.syncp, start));
3548
3549 tot->rx_packets += rpackets;
3550 tot->tx_packets += tpackets;
3551 tot->rx_bytes += rbytes;
3552 tot->tx_bytes += tbytes;
3553 tot->rx_dropped += rdrops;
3554 tot->tx_errors += terrors;
3555 }
3556
3557 tot->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3558 tot->tx_fifo_errors = DEV_STATS_READ(dev, tx_fifo_errors);
3559 tot->rx_length_errors = DEV_STATS_READ(dev, rx_length_errors);
3560 tot->rx_frame_errors = DEV_STATS_READ(dev, rx_frame_errors);
3561 }
3562
3563 static void virtnet_ack_link_announce(struct virtnet_info *vi)
3564 {
3565 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
3566 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
3567 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
3568 }
3569
3570 static bool virtnet_commit_rss_command(struct virtnet_info *vi);
3571
3572 static void virtnet_rss_update_by_qpairs(struct virtnet_info *vi, u16 queue_pairs)
3573 {
3574 u32 indir_val = 0;
3575 int i = 0;
3576
3577 for (; i < vi->rss_indir_table_size; ++i) {
3578 indir_val = ethtool_rxfh_indir_default(i, queue_pairs);
3579 vi->rss.indirection_table[i] = indir_val;
3580 }
3581 vi->rss.max_tx_vq = queue_pairs;
3582 }
3583
3584 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
3585 {
3586 struct virtio_net_ctrl_mq *mq __free(kfree) = NULL;
3587 struct virtio_net_ctrl_rss old_rss;
3588 struct net_device *dev = vi->dev;
3589 struct scatterlist sg;
3590
3591 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
3592 return 0;
3593
3594 /* Firstly check if we need update rss. Do updating if both (1) rss enabled and
3595 * (2) no user configuration.
3596 *
3597 * During rss command processing, device updates queue_pairs using rss.max_tx_vq. That is,
3598 * the device updates queue_pairs together with rss, so we can skip the sperate queue_pairs
3599 * update (VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET below) and return directly.
3600 */
3601 if (vi->has_rss && !netif_is_rxfh_configured(dev)) {
3602 memcpy(&old_rss, &vi->rss, sizeof(old_rss));
3603 if (rss_indirection_table_alloc(&vi->rss, vi->rss_indir_table_size)) {
3604 vi->rss.indirection_table = old_rss.indirection_table;
3605 return -ENOMEM;
3606 }
3607
3608 virtnet_rss_update_by_qpairs(vi, queue_pairs);
3609
3610 if (!virtnet_commit_rss_command(vi)) {
3611 /* restore ctrl_rss if commit_rss_command failed */
3612 rss_indirection_table_free(&vi->rss);
3613 memcpy(&vi->rss, &old_rss, sizeof(old_rss));
3614
3615 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d, because committing RSS failed\n",
3616 queue_pairs);
3617 return -EINVAL;
3618 }
3619 rss_indirection_table_free(&old_rss);
3620 goto succ;
3621 }
3622
3623 mq = kzalloc(sizeof(*mq), GFP_KERNEL);
3624 if (!mq)
3625 return -ENOMEM;
3626
3627 mq->virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
3628 sg_init_one(&sg, mq, sizeof(*mq));
3629
3630 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
3631 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
3632 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
3633 queue_pairs);
3634 return -EINVAL;
3635 }
3636 succ:
3637 vi->curr_queue_pairs = queue_pairs;
3638 /* virtnet_open() will refill when device is going to up. */
3639 if (dev->flags & IFF_UP)
3640 schedule_delayed_work(&vi->refill, 0);
3641
3642 return 0;
3643 }
3644
3645 static int virtnet_close(struct net_device *dev)
3646 {
3647 struct virtnet_info *vi = netdev_priv(dev);
3648 int i;
3649
3650 /* Make sure NAPI doesn't schedule refill work */
3651 disable_delayed_refill(vi);
3652 /* Make sure refill_work doesn't re-enable napi! */
3653 cancel_delayed_work_sync(&vi->refill);
3654 /* Prevent the config change callback from changing carrier
3655 * after close
3656 */
3657 virtio_config_driver_disable(vi->vdev);
3658 /* Stop getting status/speed updates: we don't care until next
3659 * open
3660 */
3661 cancel_work_sync(&vi->config_work);
3662
3663 for (i = 0; i < vi->max_queue_pairs; i++) {
3664 virtnet_disable_queue_pair(vi, i);
3665 virtnet_cancel_dim(vi, &vi->rq[i].dim);
3666 }
3667
3668 netif_carrier_off(dev);
3669
3670 return 0;
3671 }
3672
3673 static void virtnet_rx_mode_work(struct work_struct *work)
3674 {
3675 struct virtnet_info *vi =
3676 container_of(work, struct virtnet_info, rx_mode_work);
3677 u8 *promisc_allmulti __free(kfree) = NULL;
3678 struct net_device *dev = vi->dev;
3679 struct scatterlist sg[2];
3680 struct virtio_net_ctrl_mac *mac_data;
3681 struct netdev_hw_addr *ha;
3682 int uc_count;
3683 int mc_count;
3684 void *buf;
3685 int i;
3686
3687 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
3688 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
3689 return;
3690
3691 promisc_allmulti = kzalloc(sizeof(*promisc_allmulti), GFP_KERNEL);
3692 if (!promisc_allmulti) {
3693 dev_warn(&dev->dev, "Failed to set RX mode, no memory.\n");
3694 return;
3695 }
3696
3697 rtnl_lock();
3698
3699 *promisc_allmulti = !!(dev->flags & IFF_PROMISC);
3700 sg_init_one(sg, promisc_allmulti, sizeof(*promisc_allmulti));
3701
3702 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
3703 VIRTIO_NET_CTRL_RX_PROMISC, sg))
3704 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
3705 *promisc_allmulti ? "en" : "dis");
3706
3707 *promisc_allmulti = !!(dev->flags & IFF_ALLMULTI);
3708 sg_init_one(sg, promisc_allmulti, sizeof(*promisc_allmulti));
3709
3710 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
3711 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
3712 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
3713 *promisc_allmulti ? "en" : "dis");
3714
3715 netif_addr_lock_bh(dev);
3716
3717 uc_count = netdev_uc_count(dev);
3718 mc_count = netdev_mc_count(dev);
3719 /* MAC filter - use one buffer for both lists */
3720 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
3721 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
3722 mac_data = buf;
3723 if (!buf) {
3724 netif_addr_unlock_bh(dev);
3725 rtnl_unlock();
3726 return;
3727 }
3728
3729 sg_init_table(sg, 2);
3730
3731 /* Store the unicast list and count in the front of the buffer */
3732 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
3733 i = 0;
3734 netdev_for_each_uc_addr(ha, dev)
3735 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
3736
3737 sg_set_buf(&sg[0], mac_data,
3738 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
3739
3740 /* multicast list and count fill the end */
3741 mac_data = (void *)&mac_data->macs[uc_count][0];
3742
3743 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
3744 i = 0;
3745 netdev_for_each_mc_addr(ha, dev)
3746 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
3747
3748 netif_addr_unlock_bh(dev);
3749
3750 sg_set_buf(&sg[1], mac_data,
3751 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
3752
3753 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
3754 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
3755 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
3756
3757 rtnl_unlock();
3758
3759 kfree(buf);
3760 }
3761
3762 static void virtnet_set_rx_mode(struct net_device *dev)
3763 {
3764 struct virtnet_info *vi = netdev_priv(dev);
3765
3766 if (vi->rx_mode_work_enabled)
3767 schedule_work(&vi->rx_mode_work);
3768 }
3769
3770 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
3771 __be16 proto, u16 vid)
3772 {
3773 struct virtnet_info *vi = netdev_priv(dev);
3774 __virtio16 *_vid __free(kfree) = NULL;
3775 struct scatterlist sg;
3776
3777 _vid = kzalloc(sizeof(*_vid), GFP_KERNEL);
3778 if (!_vid)
3779 return -ENOMEM;
3780
3781 *_vid = cpu_to_virtio16(vi->vdev, vid);
3782 sg_init_one(&sg, _vid, sizeof(*_vid));
3783
3784 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
3785 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
3786 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
3787 return 0;
3788 }
3789
3790 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
3791 __be16 proto, u16 vid)
3792 {
3793 struct virtnet_info *vi = netdev_priv(dev);
3794 __virtio16 *_vid __free(kfree) = NULL;
3795 struct scatterlist sg;
3796
3797 _vid = kzalloc(sizeof(*_vid), GFP_KERNEL);
3798 if (!_vid)
3799 return -ENOMEM;
3800
3801 *_vid = cpu_to_virtio16(vi->vdev, vid);
3802 sg_init_one(&sg, _vid, sizeof(*_vid));
3803
3804 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
3805 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
3806 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
3807 return 0;
3808 }
3809
3810 static void virtnet_clean_affinity(struct virtnet_info *vi)
3811 {
3812 int i;
3813
3814 if (vi->affinity_hint_set) {
3815 for (i = 0; i < vi->max_queue_pairs; i++) {
3816 virtqueue_set_affinity(vi->rq[i].vq, NULL);
3817 virtqueue_set_affinity(vi->sq[i].vq, NULL);
3818 }
3819
3820 vi->affinity_hint_set = false;
3821 }
3822 }
3823
3824 static void virtnet_set_affinity(struct virtnet_info *vi)
3825 {
3826 cpumask_var_t mask;
3827 int stragglers;
3828 int group_size;
3829 int i, j, cpu;
3830 int num_cpu;
3831 int stride;
3832
3833 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
3834 virtnet_clean_affinity(vi);
3835 return;
3836 }
3837
3838 num_cpu = num_online_cpus();
3839 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
3840 stragglers = num_cpu >= vi->curr_queue_pairs ?
3841 num_cpu % vi->curr_queue_pairs :
3842 0;
3843 cpu = cpumask_first(cpu_online_mask);
3844
3845 for (i = 0; i < vi->curr_queue_pairs; i++) {
3846 group_size = stride + (i < stragglers ? 1 : 0);
3847
3848 for (j = 0; j < group_size; j++) {
3849 cpumask_set_cpu(cpu, mask);
3850 cpu = cpumask_next_wrap(cpu, cpu_online_mask,
3851 nr_cpu_ids, false);
3852 }
3853 virtqueue_set_affinity(vi->rq[i].vq, mask);
3854 virtqueue_set_affinity(vi->sq[i].vq, mask);
3855 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS);
3856 cpumask_clear(mask);
3857 }
3858
3859 vi->affinity_hint_set = true;
3860 free_cpumask_var(mask);
3861 }
3862
3863 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
3864 {
3865 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
3866 node);
3867 virtnet_set_affinity(vi);
3868 return 0;
3869 }
3870
3871 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
3872 {
3873 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
3874 node_dead);
3875 virtnet_set_affinity(vi);
3876 return 0;
3877 }
3878
3879 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
3880 {
3881 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
3882 node);
3883
3884 virtnet_clean_affinity(vi);
3885 return 0;
3886 }
3887
3888 static enum cpuhp_state virtionet_online;
3889
3890 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
3891 {
3892 int ret;
3893
3894 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
3895 if (ret)
3896 return ret;
3897 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
3898 &vi->node_dead);
3899 if (!ret)
3900 return ret;
3901 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
3902 return ret;
3903 }
3904
3905 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
3906 {
3907 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
3908 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
3909 &vi->node_dead);
3910 }
3911
3912 static int virtnet_send_ctrl_coal_vq_cmd(struct virtnet_info *vi,
3913 u16 vqn, u32 max_usecs, u32 max_packets)
3914 {
3915 struct virtio_net_ctrl_coal_vq *coal_vq __free(kfree) = NULL;
3916 struct scatterlist sgs;
3917
3918 coal_vq = kzalloc(sizeof(*coal_vq), GFP_KERNEL);
3919 if (!coal_vq)
3920 return -ENOMEM;
3921
3922 coal_vq->vqn = cpu_to_le16(vqn);
3923 coal_vq->coal.max_usecs = cpu_to_le32(max_usecs);
3924 coal_vq->coal.max_packets = cpu_to_le32(max_packets);
3925 sg_init_one(&sgs, coal_vq, sizeof(*coal_vq));
3926
3927 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
3928 VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET,
3929 &sgs))
3930 return -EINVAL;
3931
3932 return 0;
3933 }
3934
3935 static int virtnet_send_rx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
3936 u16 queue, u32 max_usecs,
3937 u32 max_packets)
3938 {
3939 int err;
3940
3941 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3942 return -EOPNOTSUPP;
3943
3944 err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
3945 max_usecs, max_packets);
3946 if (err)
3947 return err;
3948
3949 vi->rq[queue].intr_coal.max_usecs = max_usecs;
3950 vi->rq[queue].intr_coal.max_packets = max_packets;
3951
3952 return 0;
3953 }
3954
3955 static int virtnet_send_tx_ctrl_coal_vq_cmd(struct virtnet_info *vi,
3956 u16 queue, u32 max_usecs,
3957 u32 max_packets)
3958 {
3959 int err;
3960
3961 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
3962 return -EOPNOTSUPP;
3963
3964 err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
3965 max_usecs, max_packets);
3966 if (err)
3967 return err;
3968
3969 vi->sq[queue].intr_coal.max_usecs = max_usecs;
3970 vi->sq[queue].intr_coal.max_packets = max_packets;
3971
3972 return 0;
3973 }
3974
3975 static void virtnet_get_ringparam(struct net_device *dev,
3976 struct ethtool_ringparam *ring,
3977 struct kernel_ethtool_ringparam *kernel_ring,
3978 struct netlink_ext_ack *extack)
3979 {
3980 struct virtnet_info *vi = netdev_priv(dev);
3981
3982 ring->rx_max_pending = vi->rq[0].vq->num_max;
3983 ring->tx_max_pending = vi->sq[0].vq->num_max;
3984 ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
3985 ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
3986 }
3987
3988 static int virtnet_set_ringparam(struct net_device *dev,
3989 struct ethtool_ringparam *ring,
3990 struct kernel_ethtool_ringparam *kernel_ring,
3991 struct netlink_ext_ack *extack)
3992 {
3993 struct virtnet_info *vi = netdev_priv(dev);
3994 u32 rx_pending, tx_pending;
3995 struct receive_queue *rq;
3996 struct send_queue *sq;
3997 int i, err;
3998
3999 if (ring->rx_mini_pending || ring->rx_jumbo_pending)
4000 return -EINVAL;
4001
4002 rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
4003 tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
4004
4005 if (ring->rx_pending == rx_pending &&
4006 ring->tx_pending == tx_pending)
4007 return 0;
4008
4009 if (ring->rx_pending > vi->rq[0].vq->num_max)
4010 return -EINVAL;
4011
4012 if (ring->tx_pending > vi->sq[0].vq->num_max)
4013 return -EINVAL;
4014
4015 for (i = 0; i < vi->max_queue_pairs; i++) {
4016 rq = vi->rq + i;
4017 sq = vi->sq + i;
4018
4019 if (ring->tx_pending != tx_pending) {
4020 err = virtnet_tx_resize(vi, sq, ring->tx_pending);
4021 if (err)
4022 return err;
4023
4024 /* Upon disabling and re-enabling a transmit virtqueue, the device must
4025 * set the coalescing parameters of the virtqueue to those configured
4026 * through the VIRTIO_NET_CTRL_NOTF_COAL_TX_SET command, or, if the driver
4027 * did not set any TX coalescing parameters, to 0.
4028 */
4029 err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, i,
4030 vi->intr_coal_tx.max_usecs,
4031 vi->intr_coal_tx.max_packets);
4032
4033 /* Don't break the tx resize action if the vq coalescing is not
4034 * supported. The same is true for rx resize below.
4035 */
4036 if (err && err != -EOPNOTSUPP)
4037 return err;
4038 }
4039
4040 if (ring->rx_pending != rx_pending) {
4041 err = virtnet_rx_resize(vi, rq, ring->rx_pending);
4042 if (err)
4043 return err;
4044
4045 /* The reason is same as the transmit virtqueue reset */
4046 mutex_lock(&vi->rq[i].dim_lock);
4047 err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, i,
4048 vi->intr_coal_rx.max_usecs,
4049 vi->intr_coal_rx.max_packets);
4050 mutex_unlock(&vi->rq[i].dim_lock);
4051 if (err && err != -EOPNOTSUPP)
4052 return err;
4053 }
4054 }
4055
4056 return 0;
4057 }
4058
4059 static bool virtnet_commit_rss_command(struct virtnet_info *vi)
4060 {
4061 struct net_device *dev = vi->dev;
4062 struct scatterlist sgs[4];
4063 unsigned int sg_buf_size;
4064
4065 /* prepare sgs */
4066 sg_init_table(sgs, 4);
4067
4068 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, hash_cfg_reserved);
4069 sg_set_buf(&sgs[0], &vi->rss, sg_buf_size);
4070
4071 if (vi->has_rss) {
4072 sg_buf_size = sizeof(uint16_t) * vi->rss_indir_table_size;
4073 sg_set_buf(&sgs[1], vi->rss.indirection_table, sg_buf_size);
4074 } else {
4075 sg_set_buf(&sgs[1], &vi->rss.hash_cfg_reserved, sizeof(uint16_t));
4076 }
4077
4078 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key)
4079 - offsetof(struct virtio_net_ctrl_rss, max_tx_vq);
4080 sg_set_buf(&sgs[2], &vi->rss.max_tx_vq, sg_buf_size);
4081
4082 sg_buf_size = vi->rss_key_size;
4083 sg_set_buf(&sgs[3], vi->rss.key, sg_buf_size);
4084
4085 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
4086 vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
4087 : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs))
4088 goto err;
4089
4090 return true;
4091
4092 err:
4093 dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
4094 return false;
4095
4096 }
4097
4098 static void virtnet_init_default_rss(struct virtnet_info *vi)
4099 {
4100 vi->rss.hash_types = vi->rss_hash_types_supported;
4101 vi->rss_hash_types_saved = vi->rss_hash_types_supported;
4102 vi->rss.indirection_table_mask = vi->rss_indir_table_size
4103 ? vi->rss_indir_table_size - 1 : 0;
4104 vi->rss.unclassified_queue = 0;
4105
4106 virtnet_rss_update_by_qpairs(vi, vi->curr_queue_pairs);
4107
4108 vi->rss.hash_key_length = vi->rss_key_size;
4109
4110 netdev_rss_key_fill(vi->rss.key, vi->rss_key_size);
4111 }
4112
4113 static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info)
4114 {
4115 info->data = 0;
4116 switch (info->flow_type) {
4117 case TCP_V4_FLOW:
4118 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
4119 info->data = RXH_IP_SRC | RXH_IP_DST |
4120 RXH_L4_B_0_1 | RXH_L4_B_2_3;
4121 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
4122 info->data = RXH_IP_SRC | RXH_IP_DST;
4123 }
4124 break;
4125 case TCP_V6_FLOW:
4126 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) {
4127 info->data = RXH_IP_SRC | RXH_IP_DST |
4128 RXH_L4_B_0_1 | RXH_L4_B_2_3;
4129 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
4130 info->data = RXH_IP_SRC | RXH_IP_DST;
4131 }
4132 break;
4133 case UDP_V4_FLOW:
4134 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) {
4135 info->data = RXH_IP_SRC | RXH_IP_DST |
4136 RXH_L4_B_0_1 | RXH_L4_B_2_3;
4137 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
4138 info->data = RXH_IP_SRC | RXH_IP_DST;
4139 }
4140 break;
4141 case UDP_V6_FLOW:
4142 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) {
4143 info->data = RXH_IP_SRC | RXH_IP_DST |
4144 RXH_L4_B_0_1 | RXH_L4_B_2_3;
4145 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
4146 info->data = RXH_IP_SRC | RXH_IP_DST;
4147 }
4148 break;
4149 case IPV4_FLOW:
4150 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4)
4151 info->data = RXH_IP_SRC | RXH_IP_DST;
4152
4153 break;
4154 case IPV6_FLOW:
4155 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6)
4156 info->data = RXH_IP_SRC | RXH_IP_DST;
4157
4158 break;
4159 default:
4160 info->data = 0;
4161 break;
4162 }
4163 }
4164
4165 static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info)
4166 {
4167 u32 new_hashtypes = vi->rss_hash_types_saved;
4168 bool is_disable = info->data & RXH_DISCARD;
4169 bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3);
4170
4171 /* supports only 'sd', 'sdfn' and 'r' */
4172 if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable))
4173 return false;
4174
4175 switch (info->flow_type) {
4176 case TCP_V4_FLOW:
4177 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4);
4178 if (!is_disable)
4179 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
4180 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0);
4181 break;
4182 case UDP_V4_FLOW:
4183 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4);
4184 if (!is_disable)
4185 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
4186 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0);
4187 break;
4188 case IPV4_FLOW:
4189 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4;
4190 if (!is_disable)
4191 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4;
4192 break;
4193 case TCP_V6_FLOW:
4194 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6);
4195 if (!is_disable)
4196 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
4197 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0);
4198 break;
4199 case UDP_V6_FLOW:
4200 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6);
4201 if (!is_disable)
4202 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
4203 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0);
4204 break;
4205 case IPV6_FLOW:
4206 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6;
4207 if (!is_disable)
4208 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6;
4209 break;
4210 default:
4211 /* unsupported flow */
4212 return false;
4213 }
4214
4215 /* if unsupported hashtype was set */
4216 if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported))
4217 return false;
4218
4219 if (new_hashtypes != vi->rss_hash_types_saved) {
4220 vi->rss_hash_types_saved = new_hashtypes;
4221 vi->rss.hash_types = vi->rss_hash_types_saved;
4222 if (vi->dev->features & NETIF_F_RXHASH)
4223 return virtnet_commit_rss_command(vi);
4224 }
4225
4226 return true;
4227 }
4228
4229 static void virtnet_get_drvinfo(struct net_device *dev,
4230 struct ethtool_drvinfo *info)
4231 {
4232 struct virtnet_info *vi = netdev_priv(dev);
4233 struct virtio_device *vdev = vi->vdev;
4234
4235 strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
4236 strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
4237 strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
4238
4239 }
4240
4241 /* TODO: Eliminate OOO packets during switching */
4242 static int virtnet_set_channels(struct net_device *dev,
4243 struct ethtool_channels *channels)
4244 {
4245 struct virtnet_info *vi = netdev_priv(dev);
4246 u16 queue_pairs = channels->combined_count;
4247 int err;
4248
4249 /* We don't support separate rx/tx channels.
4250 * We don't allow setting 'other' channels.
4251 */
4252 if (channels->rx_count || channels->tx_count || channels->other_count)
4253 return -EINVAL;
4254
4255 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
4256 return -EINVAL;
4257
4258 /* For now we don't support modifying channels while XDP is loaded
4259 * also when XDP is loaded all RX queues have XDP programs so we only
4260 * need to check a single RX queue.
4261 */
4262 if (vi->rq[0].xdp_prog)
4263 return -EINVAL;
4264
4265 cpus_read_lock();
4266 err = virtnet_set_queues(vi, queue_pairs);
4267 if (err) {
4268 cpus_read_unlock();
4269 goto err;
4270 }
4271 virtnet_set_affinity(vi);
4272 cpus_read_unlock();
4273
4274 netif_set_real_num_tx_queues(dev, queue_pairs);
4275 netif_set_real_num_rx_queues(dev, queue_pairs);
4276 err:
4277 return err;
4278 }
4279
4280 static void virtnet_stats_sprintf(u8 **p, const char *fmt, const char *noq_fmt,
4281 int num, int qid, const struct virtnet_stat_desc *desc)
4282 {
4283 int i;
4284
4285 if (qid < 0) {
4286 for (i = 0; i < num; ++i)
4287 ethtool_sprintf(p, noq_fmt, desc[i].desc);
4288 } else {
4289 for (i = 0; i < num; ++i)
4290 ethtool_sprintf(p, fmt, qid, desc[i].desc);
4291 }
4292 }
4293
4294 /* qid == -1: for rx/tx queue total field */
4295 static void virtnet_get_stats_string(struct virtnet_info *vi, int type, int qid, u8 **data)
4296 {
4297 const struct virtnet_stat_desc *desc;
4298 const char *fmt, *noq_fmt;
4299 u8 *p = *data;
4300 u32 num;
4301
4302 if (type == VIRTNET_Q_TYPE_CQ && qid >= 0) {
4303 noq_fmt = "cq_hw_%s";
4304
4305 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_CVQ) {
4306 desc = &virtnet_stats_cvq_desc[0];
4307 num = ARRAY_SIZE(virtnet_stats_cvq_desc);
4308
4309 virtnet_stats_sprintf(&p, NULL, noq_fmt, num, -1, desc);
4310 }
4311 }
4312
4313 if (type == VIRTNET_Q_TYPE_RX) {
4314 fmt = "rx%u_%s";
4315 noq_fmt = "rx_%s";
4316
4317 desc = &virtnet_rq_stats_desc[0];
4318 num = ARRAY_SIZE(virtnet_rq_stats_desc);
4319
4320 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4321
4322 fmt = "rx%u_hw_%s";
4323 noq_fmt = "rx_hw_%s";
4324
4325 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4326 desc = &virtnet_stats_rx_basic_desc[0];
4327 num = ARRAY_SIZE(virtnet_stats_rx_basic_desc);
4328
4329 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4330 }
4331
4332 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4333 desc = &virtnet_stats_rx_csum_desc[0];
4334 num = ARRAY_SIZE(virtnet_stats_rx_csum_desc);
4335
4336 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4337 }
4338
4339 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4340 desc = &virtnet_stats_rx_speed_desc[0];
4341 num = ARRAY_SIZE(virtnet_stats_rx_speed_desc);
4342
4343 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4344 }
4345 }
4346
4347 if (type == VIRTNET_Q_TYPE_TX) {
4348 fmt = "tx%u_%s";
4349 noq_fmt = "tx_%s";
4350
4351 desc = &virtnet_sq_stats_desc[0];
4352 num = ARRAY_SIZE(virtnet_sq_stats_desc);
4353
4354 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4355
4356 fmt = "tx%u_hw_%s";
4357 noq_fmt = "tx_hw_%s";
4358
4359 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4360 desc = &virtnet_stats_tx_basic_desc[0];
4361 num = ARRAY_SIZE(virtnet_stats_tx_basic_desc);
4362
4363 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4364 }
4365
4366 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4367 desc = &virtnet_stats_tx_gso_desc[0];
4368 num = ARRAY_SIZE(virtnet_stats_tx_gso_desc);
4369
4370 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4371 }
4372
4373 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4374 desc = &virtnet_stats_tx_speed_desc[0];
4375 num = ARRAY_SIZE(virtnet_stats_tx_speed_desc);
4376
4377 virtnet_stats_sprintf(&p, fmt, noq_fmt, num, qid, desc);
4378 }
4379 }
4380
4381 *data = p;
4382 }
4383
4384 struct virtnet_stats_ctx {
4385 /* The stats are write to qstats or ethtool -S */
4386 bool to_qstat;
4387
4388 /* Used to calculate the offset inside the output buffer. */
4389 u32 desc_num[3];
4390
4391 /* The actual supported stat types. */
4392 u64 bitmap[3];
4393
4394 /* Used to calculate the reply buffer size. */
4395 u32 size[3];
4396
4397 /* Record the output buffer. */
4398 u64 *data;
4399 };
4400
4401 static void virtnet_stats_ctx_init(struct virtnet_info *vi,
4402 struct virtnet_stats_ctx *ctx,
4403 u64 *data, bool to_qstat)
4404 {
4405 u32 queue_type;
4406
4407 ctx->data = data;
4408 ctx->to_qstat = to_qstat;
4409
4410 if (to_qstat) {
4411 ctx->desc_num[VIRTNET_Q_TYPE_RX] = ARRAY_SIZE(virtnet_rq_stats_desc_qstat);
4412 ctx->desc_num[VIRTNET_Q_TYPE_TX] = ARRAY_SIZE(virtnet_sq_stats_desc_qstat);
4413
4414 queue_type = VIRTNET_Q_TYPE_RX;
4415
4416 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4417 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_RX_BASIC;
4418 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_basic_desc_qstat);
4419 ctx->size[queue_type] += sizeof(struct virtio_net_stats_rx_basic);
4420 }
4421
4422 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4423 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_RX_CSUM;
4424 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_csum_desc_qstat);
4425 ctx->size[queue_type] += sizeof(struct virtio_net_stats_rx_csum);
4426 }
4427
4428 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_GSO) {
4429 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_RX_GSO;
4430 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_gso_desc_qstat);
4431 ctx->size[queue_type] += sizeof(struct virtio_net_stats_rx_gso);
4432 }
4433
4434 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4435 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_RX_SPEED;
4436 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_speed_desc_qstat);
4437 ctx->size[queue_type] += sizeof(struct virtio_net_stats_rx_speed);
4438 }
4439
4440 queue_type = VIRTNET_Q_TYPE_TX;
4441
4442 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4443 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_TX_BASIC;
4444 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_basic_desc_qstat);
4445 ctx->size[queue_type] += sizeof(struct virtio_net_stats_tx_basic);
4446 }
4447
4448 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_CSUM) {
4449 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_TX_CSUM;
4450 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_csum_desc_qstat);
4451 ctx->size[queue_type] += sizeof(struct virtio_net_stats_tx_csum);
4452 }
4453
4454 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4455 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_TX_GSO;
4456 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_gso_desc_qstat);
4457 ctx->size[queue_type] += sizeof(struct virtio_net_stats_tx_gso);
4458 }
4459
4460 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4461 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_TX_SPEED;
4462 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_speed_desc_qstat);
4463 ctx->size[queue_type] += sizeof(struct virtio_net_stats_tx_speed);
4464 }
4465
4466 return;
4467 }
4468
4469 ctx->desc_num[VIRTNET_Q_TYPE_RX] = ARRAY_SIZE(virtnet_rq_stats_desc);
4470 ctx->desc_num[VIRTNET_Q_TYPE_TX] = ARRAY_SIZE(virtnet_sq_stats_desc);
4471
4472 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_CVQ) {
4473 queue_type = VIRTNET_Q_TYPE_CQ;
4474
4475 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_CVQ;
4476 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_cvq_desc);
4477 ctx->size[queue_type] += sizeof(struct virtio_net_stats_cvq);
4478 }
4479
4480 queue_type = VIRTNET_Q_TYPE_RX;
4481
4482 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4483 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_RX_BASIC;
4484 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_basic_desc);
4485 ctx->size[queue_type] += sizeof(struct virtio_net_stats_rx_basic);
4486 }
4487
4488 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4489 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_RX_CSUM;
4490 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_csum_desc);
4491 ctx->size[queue_type] += sizeof(struct virtio_net_stats_rx_csum);
4492 }
4493
4494 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4495 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_RX_SPEED;
4496 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_rx_speed_desc);
4497 ctx->size[queue_type] += sizeof(struct virtio_net_stats_rx_speed);
4498 }
4499
4500 queue_type = VIRTNET_Q_TYPE_TX;
4501
4502 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4503 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_TX_BASIC;
4504 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_basic_desc);
4505 ctx->size[queue_type] += sizeof(struct virtio_net_stats_tx_basic);
4506 }
4507
4508 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4509 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_TX_GSO;
4510 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_gso_desc);
4511 ctx->size[queue_type] += sizeof(struct virtio_net_stats_tx_gso);
4512 }
4513
4514 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4515 ctx->bitmap[queue_type] |= VIRTIO_NET_STATS_TYPE_TX_SPEED;
4516 ctx->desc_num[queue_type] += ARRAY_SIZE(virtnet_stats_tx_speed_desc);
4517 ctx->size[queue_type] += sizeof(struct virtio_net_stats_tx_speed);
4518 }
4519 }
4520
4521 /* stats_sum_queue - Calculate the sum of the same fields in sq or rq.
4522 * @sum: the position to store the sum values
4523 * @num: field num
4524 * @q_value: the first queue fields
4525 * @q_num: number of the queues
4526 */
4527 static void stats_sum_queue(u64 *sum, u32 num, u64 *q_value, u32 q_num)
4528 {
4529 u32 step = num;
4530 int i, j;
4531 u64 *p;
4532
4533 for (i = 0; i < num; ++i) {
4534 p = sum + i;
4535 *p = 0;
4536
4537 for (j = 0; j < q_num; ++j)
4538 *p += *(q_value + i + j * step);
4539 }
4540 }
4541
4542 static void virtnet_fill_total_fields(struct virtnet_info *vi,
4543 struct virtnet_stats_ctx *ctx)
4544 {
4545 u64 *data, *first_rx_q, *first_tx_q;
4546 u32 num_cq, num_rx, num_tx;
4547
4548 num_cq = ctx->desc_num[VIRTNET_Q_TYPE_CQ];
4549 num_rx = ctx->desc_num[VIRTNET_Q_TYPE_RX];
4550 num_tx = ctx->desc_num[VIRTNET_Q_TYPE_TX];
4551
4552 first_rx_q = ctx->data + num_rx + num_tx + num_cq;
4553 first_tx_q = first_rx_q + vi->curr_queue_pairs * num_rx;
4554
4555 data = ctx->data;
4556
4557 stats_sum_queue(data, num_rx, first_rx_q, vi->curr_queue_pairs);
4558
4559 data = ctx->data + num_rx;
4560
4561 stats_sum_queue(data, num_tx, first_tx_q, vi->curr_queue_pairs);
4562 }
4563
4564 static void virtnet_fill_stats_qstat(struct virtnet_info *vi, u32 qid,
4565 struct virtnet_stats_ctx *ctx,
4566 const u8 *base, bool drv_stats, u8 reply_type)
4567 {
4568 const struct virtnet_stat_desc *desc;
4569 const u64_stats_t *v_stat;
4570 u64 offset, bitmap;
4571 const __le64 *v;
4572 u32 queue_type;
4573 int i, num;
4574
4575 queue_type = vq_type(vi, qid);
4576 bitmap = ctx->bitmap[queue_type];
4577
4578 if (drv_stats) {
4579 if (queue_type == VIRTNET_Q_TYPE_RX) {
4580 desc = &virtnet_rq_stats_desc_qstat[0];
4581 num = ARRAY_SIZE(virtnet_rq_stats_desc_qstat);
4582 } else {
4583 desc = &virtnet_sq_stats_desc_qstat[0];
4584 num = ARRAY_SIZE(virtnet_sq_stats_desc_qstat);
4585 }
4586
4587 for (i = 0; i < num; ++i) {
4588 offset = desc[i].qstat_offset / sizeof(*ctx->data);
4589 v_stat = (const u64_stats_t *)(base + desc[i].offset);
4590 ctx->data[offset] = u64_stats_read(v_stat);
4591 }
4592 return;
4593 }
4594
4595 if (bitmap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4596 desc = &virtnet_stats_rx_basic_desc_qstat[0];
4597 num = ARRAY_SIZE(virtnet_stats_rx_basic_desc_qstat);
4598 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_BASIC)
4599 goto found;
4600 }
4601
4602 if (bitmap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4603 desc = &virtnet_stats_rx_csum_desc_qstat[0];
4604 num = ARRAY_SIZE(virtnet_stats_rx_csum_desc_qstat);
4605 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_CSUM)
4606 goto found;
4607 }
4608
4609 if (bitmap & VIRTIO_NET_STATS_TYPE_RX_GSO) {
4610 desc = &virtnet_stats_rx_gso_desc_qstat[0];
4611 num = ARRAY_SIZE(virtnet_stats_rx_gso_desc_qstat);
4612 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_GSO)
4613 goto found;
4614 }
4615
4616 if (bitmap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4617 desc = &virtnet_stats_rx_speed_desc_qstat[0];
4618 num = ARRAY_SIZE(virtnet_stats_rx_speed_desc_qstat);
4619 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_SPEED)
4620 goto found;
4621 }
4622
4623 if (bitmap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4624 desc = &virtnet_stats_tx_basic_desc_qstat[0];
4625 num = ARRAY_SIZE(virtnet_stats_tx_basic_desc_qstat);
4626 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_BASIC)
4627 goto found;
4628 }
4629
4630 if (bitmap & VIRTIO_NET_STATS_TYPE_TX_CSUM) {
4631 desc = &virtnet_stats_tx_csum_desc_qstat[0];
4632 num = ARRAY_SIZE(virtnet_stats_tx_csum_desc_qstat);
4633 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_CSUM)
4634 goto found;
4635 }
4636
4637 if (bitmap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4638 desc = &virtnet_stats_tx_gso_desc_qstat[0];
4639 num = ARRAY_SIZE(virtnet_stats_tx_gso_desc_qstat);
4640 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_GSO)
4641 goto found;
4642 }
4643
4644 if (bitmap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4645 desc = &virtnet_stats_tx_speed_desc_qstat[0];
4646 num = ARRAY_SIZE(virtnet_stats_tx_speed_desc_qstat);
4647 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_SPEED)
4648 goto found;
4649 }
4650
4651 return;
4652
4653 found:
4654 for (i = 0; i < num; ++i) {
4655 offset = desc[i].qstat_offset / sizeof(*ctx->data);
4656 v = (const __le64 *)(base + desc[i].offset);
4657 ctx->data[offset] = le64_to_cpu(*v);
4658 }
4659 }
4660
4661 /* virtnet_fill_stats - copy the stats to qstats or ethtool -S
4662 * The stats source is the device or the driver.
4663 *
4664 * @vi: virtio net info
4665 * @qid: the vq id
4666 * @ctx: stats ctx (initiated by virtnet_stats_ctx_init())
4667 * @base: pointer to the device reply or the driver stats structure.
4668 * @drv_stats: designate the base type (device reply, driver stats)
4669 * @type: the type of the device reply (if drv_stats is true, this must be zero)
4670 */
4671 static void virtnet_fill_stats(struct virtnet_info *vi, u32 qid,
4672 struct virtnet_stats_ctx *ctx,
4673 const u8 *base, bool drv_stats, u8 reply_type)
4674 {
4675 u32 queue_type, num_rx, num_tx, num_cq;
4676 const struct virtnet_stat_desc *desc;
4677 const u64_stats_t *v_stat;
4678 u64 offset, bitmap;
4679 const __le64 *v;
4680 int i, num;
4681
4682 if (ctx->to_qstat)
4683 return virtnet_fill_stats_qstat(vi, qid, ctx, base, drv_stats, reply_type);
4684
4685 num_cq = ctx->desc_num[VIRTNET_Q_TYPE_CQ];
4686 num_rx = ctx->desc_num[VIRTNET_Q_TYPE_RX];
4687 num_tx = ctx->desc_num[VIRTNET_Q_TYPE_TX];
4688
4689 queue_type = vq_type(vi, qid);
4690 bitmap = ctx->bitmap[queue_type];
4691
4692 /* skip the total fields of pairs */
4693 offset = num_rx + num_tx;
4694
4695 if (queue_type == VIRTNET_Q_TYPE_TX) {
4696 offset += num_cq + num_rx * vi->curr_queue_pairs + num_tx * (qid / 2);
4697
4698 num = ARRAY_SIZE(virtnet_sq_stats_desc);
4699 if (drv_stats) {
4700 desc = &virtnet_sq_stats_desc[0];
4701 goto drv_stats;
4702 }
4703
4704 offset += num;
4705
4706 } else if (queue_type == VIRTNET_Q_TYPE_RX) {
4707 offset += num_cq + num_rx * (qid / 2);
4708
4709 num = ARRAY_SIZE(virtnet_rq_stats_desc);
4710 if (drv_stats) {
4711 desc = &virtnet_rq_stats_desc[0];
4712 goto drv_stats;
4713 }
4714
4715 offset += num;
4716 }
4717
4718 if (bitmap & VIRTIO_NET_STATS_TYPE_CVQ) {
4719 desc = &virtnet_stats_cvq_desc[0];
4720 num = ARRAY_SIZE(virtnet_stats_cvq_desc);
4721 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_CVQ)
4722 goto found;
4723
4724 offset += num;
4725 }
4726
4727 if (bitmap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
4728 desc = &virtnet_stats_rx_basic_desc[0];
4729 num = ARRAY_SIZE(virtnet_stats_rx_basic_desc);
4730 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_BASIC)
4731 goto found;
4732
4733 offset += num;
4734 }
4735
4736 if (bitmap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
4737 desc = &virtnet_stats_rx_csum_desc[0];
4738 num = ARRAY_SIZE(virtnet_stats_rx_csum_desc);
4739 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_CSUM)
4740 goto found;
4741
4742 offset += num;
4743 }
4744
4745 if (bitmap & VIRTIO_NET_STATS_TYPE_RX_SPEED) {
4746 desc = &virtnet_stats_rx_speed_desc[0];
4747 num = ARRAY_SIZE(virtnet_stats_rx_speed_desc);
4748 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_RX_SPEED)
4749 goto found;
4750
4751 offset += num;
4752 }
4753
4754 if (bitmap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
4755 desc = &virtnet_stats_tx_basic_desc[0];
4756 num = ARRAY_SIZE(virtnet_stats_tx_basic_desc);
4757 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_BASIC)
4758 goto found;
4759
4760 offset += num;
4761 }
4762
4763 if (bitmap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
4764 desc = &virtnet_stats_tx_gso_desc[0];
4765 num = ARRAY_SIZE(virtnet_stats_tx_gso_desc);
4766 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_GSO)
4767 goto found;
4768
4769 offset += num;
4770 }
4771
4772 if (bitmap & VIRTIO_NET_STATS_TYPE_TX_SPEED) {
4773 desc = &virtnet_stats_tx_speed_desc[0];
4774 num = ARRAY_SIZE(virtnet_stats_tx_speed_desc);
4775 if (reply_type == VIRTIO_NET_STATS_TYPE_REPLY_TX_SPEED)
4776 goto found;
4777
4778 offset += num;
4779 }
4780
4781 return;
4782
4783 found:
4784 for (i = 0; i < num; ++i) {
4785 v = (const __le64 *)(base + desc[i].offset);
4786 ctx->data[offset + i] = le64_to_cpu(*v);
4787 }
4788
4789 return;
4790
4791 drv_stats:
4792 for (i = 0; i < num; ++i) {
4793 v_stat = (const u64_stats_t *)(base + desc[i].offset);
4794 ctx->data[offset + i] = u64_stats_read(v_stat);
4795 }
4796 }
4797
4798 static int __virtnet_get_hw_stats(struct virtnet_info *vi,
4799 struct virtnet_stats_ctx *ctx,
4800 struct virtio_net_ctrl_queue_stats *req,
4801 int req_size, void *reply, int res_size)
4802 {
4803 struct virtio_net_stats_reply_hdr *hdr;
4804 struct scatterlist sgs_in, sgs_out;
4805 void *p;
4806 u32 qid;
4807 int ok;
4808
4809 sg_init_one(&sgs_out, req, req_size);
4810 sg_init_one(&sgs_in, reply, res_size);
4811
4812 ok = virtnet_send_command_reply(vi, VIRTIO_NET_CTRL_STATS,
4813 VIRTIO_NET_CTRL_STATS_GET,
4814 &sgs_out, &sgs_in);
4815
4816 if (!ok)
4817 return ok;
4818
4819 for (p = reply; p - reply < res_size; p += le16_to_cpu(hdr->size)) {
4820 hdr = p;
4821 qid = le16_to_cpu(hdr->vq_index);
4822 virtnet_fill_stats(vi, qid, ctx, p, false, hdr->type);
4823 }
4824
4825 return 0;
4826 }
4827
4828 static void virtnet_make_stat_req(struct virtnet_info *vi,
4829 struct virtnet_stats_ctx *ctx,
4830 struct virtio_net_ctrl_queue_stats *req,
4831 int qid, int *idx)
4832 {
4833 int qtype = vq_type(vi, qid);
4834 u64 bitmap = ctx->bitmap[qtype];
4835
4836 if (!bitmap)
4837 return;
4838
4839 req->stats[*idx].vq_index = cpu_to_le16(qid);
4840 req->stats[*idx].types_bitmap[0] = cpu_to_le64(bitmap);
4841 *idx += 1;
4842 }
4843
4844 /* qid: -1: get stats of all vq.
4845 * > 0: get the stats for the special vq. This must not be cvq.
4846 */
4847 static int virtnet_get_hw_stats(struct virtnet_info *vi,
4848 struct virtnet_stats_ctx *ctx, int qid)
4849 {
4850 int qnum, i, j, res_size, qtype, last_vq, first_vq;
4851 struct virtio_net_ctrl_queue_stats *req;
4852 bool enable_cvq;
4853 void *reply;
4854 int ok;
4855
4856 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS))
4857 return 0;
4858
4859 if (qid == -1) {
4860 last_vq = vi->curr_queue_pairs * 2 - 1;
4861 first_vq = 0;
4862 enable_cvq = true;
4863 } else {
4864 last_vq = qid;
4865 first_vq = qid;
4866 enable_cvq = false;
4867 }
4868
4869 qnum = 0;
4870 res_size = 0;
4871 for (i = first_vq; i <= last_vq ; ++i) {
4872 qtype = vq_type(vi, i);
4873 if (ctx->bitmap[qtype]) {
4874 ++qnum;
4875 res_size += ctx->size[qtype];
4876 }
4877 }
4878
4879 if (enable_cvq && ctx->bitmap[VIRTNET_Q_TYPE_CQ]) {
4880 res_size += ctx->size[VIRTNET_Q_TYPE_CQ];
4881 qnum += 1;
4882 }
4883
4884 req = kcalloc(qnum, sizeof(*req), GFP_KERNEL);
4885 if (!req)
4886 return -ENOMEM;
4887
4888 reply = kmalloc(res_size, GFP_KERNEL);
4889 if (!reply) {
4890 kfree(req);
4891 return -ENOMEM;
4892 }
4893
4894 j = 0;
4895 for (i = first_vq; i <= last_vq ; ++i)
4896 virtnet_make_stat_req(vi, ctx, req, i, &j);
4897
4898 if (enable_cvq)
4899 virtnet_make_stat_req(vi, ctx, req, vi->max_queue_pairs * 2, &j);
4900
4901 ok = __virtnet_get_hw_stats(vi, ctx, req, sizeof(*req) * j, reply, res_size);
4902
4903 kfree(req);
4904 kfree(reply);
4905
4906 return ok;
4907 }
4908
4909 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
4910 {
4911 struct virtnet_info *vi = netdev_priv(dev);
4912 unsigned int i;
4913 u8 *p = data;
4914
4915 switch (stringset) {
4916 case ETH_SS_STATS:
4917 /* Generate the total field names. */
4918 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_RX, -1, &p);
4919 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_TX, -1, &p);
4920
4921 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_CQ, 0, &p);
4922
4923 for (i = 0; i < vi->curr_queue_pairs; ++i)
4924 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_RX, i, &p);
4925
4926 for (i = 0; i < vi->curr_queue_pairs; ++i)
4927 virtnet_get_stats_string(vi, VIRTNET_Q_TYPE_TX, i, &p);
4928 break;
4929 }
4930 }
4931
4932 static int virtnet_get_sset_count(struct net_device *dev, int sset)
4933 {
4934 struct virtnet_info *vi = netdev_priv(dev);
4935 struct virtnet_stats_ctx ctx = {0};
4936 u32 pair_count;
4937
4938 switch (sset) {
4939 case ETH_SS_STATS:
4940 virtnet_stats_ctx_init(vi, &ctx, NULL, false);
4941
4942 pair_count = ctx.desc_num[VIRTNET_Q_TYPE_RX] + ctx.desc_num[VIRTNET_Q_TYPE_TX];
4943
4944 return pair_count + ctx.desc_num[VIRTNET_Q_TYPE_CQ] +
4945 vi->curr_queue_pairs * pair_count;
4946 default:
4947 return -EOPNOTSUPP;
4948 }
4949 }
4950
4951 static void virtnet_get_ethtool_stats(struct net_device *dev,
4952 struct ethtool_stats *stats, u64 *data)
4953 {
4954 struct virtnet_info *vi = netdev_priv(dev);
4955 struct virtnet_stats_ctx ctx = {0};
4956 unsigned int start, i;
4957 const u8 *stats_base;
4958
4959 virtnet_stats_ctx_init(vi, &ctx, data, false);
4960 if (virtnet_get_hw_stats(vi, &ctx, -1))
4961 dev_warn(&vi->dev->dev, "Failed to get hw stats.\n");
4962
4963 for (i = 0; i < vi->curr_queue_pairs; i++) {
4964 struct receive_queue *rq = &vi->rq[i];
4965 struct send_queue *sq = &vi->sq[i];
4966
4967 stats_base = (const u8 *)&rq->stats;
4968 do {
4969 start = u64_stats_fetch_begin(&rq->stats.syncp);
4970 virtnet_fill_stats(vi, i * 2, &ctx, stats_base, true, 0);
4971 } while (u64_stats_fetch_retry(&rq->stats.syncp, start));
4972
4973 stats_base = (const u8 *)&sq->stats;
4974 do {
4975 start = u64_stats_fetch_begin(&sq->stats.syncp);
4976 virtnet_fill_stats(vi, i * 2 + 1, &ctx, stats_base, true, 0);
4977 } while (u64_stats_fetch_retry(&sq->stats.syncp, start));
4978 }
4979
4980 virtnet_fill_total_fields(vi, &ctx);
4981 }
4982
4983 static void virtnet_get_channels(struct net_device *dev,
4984 struct ethtool_channels *channels)
4985 {
4986 struct virtnet_info *vi = netdev_priv(dev);
4987
4988 channels->combined_count = vi->curr_queue_pairs;
4989 channels->max_combined = vi->max_queue_pairs;
4990 channels->max_other = 0;
4991 channels->rx_count = 0;
4992 channels->tx_count = 0;
4993 channels->other_count = 0;
4994 }
4995
4996 static int virtnet_set_link_ksettings(struct net_device *dev,
4997 const struct ethtool_link_ksettings *cmd)
4998 {
4999 struct virtnet_info *vi = netdev_priv(dev);
5000
5001 return ethtool_virtdev_set_link_ksettings(dev, cmd,
5002 &vi->speed, &vi->duplex);
5003 }
5004
5005 static int virtnet_get_link_ksettings(struct net_device *dev,
5006 struct ethtool_link_ksettings *cmd)
5007 {
5008 struct virtnet_info *vi = netdev_priv(dev);
5009
5010 cmd->base.speed = vi->speed;
5011 cmd->base.duplex = vi->duplex;
5012 cmd->base.port = PORT_OTHER;
5013
5014 return 0;
5015 }
5016
5017 static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi,
5018 struct ethtool_coalesce *ec)
5019 {
5020 struct virtio_net_ctrl_coal_tx *coal_tx __free(kfree) = NULL;
5021 struct scatterlist sgs_tx;
5022 int i;
5023
5024 coal_tx = kzalloc(sizeof(*coal_tx), GFP_KERNEL);
5025 if (!coal_tx)
5026 return -ENOMEM;
5027
5028 coal_tx->tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
5029 coal_tx->tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
5030 sg_init_one(&sgs_tx, coal_tx, sizeof(*coal_tx));
5031
5032 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
5033 VIRTIO_NET_CTRL_NOTF_COAL_TX_SET,
5034 &sgs_tx))
5035 return -EINVAL;
5036
5037 vi->intr_coal_tx.max_usecs = ec->tx_coalesce_usecs;
5038 vi->intr_coal_tx.max_packets = ec->tx_max_coalesced_frames;
5039 for (i = 0; i < vi->max_queue_pairs; i++) {
5040 vi->sq[i].intr_coal.max_usecs = ec->tx_coalesce_usecs;
5041 vi->sq[i].intr_coal.max_packets = ec->tx_max_coalesced_frames;
5042 }
5043
5044 return 0;
5045 }
5046
5047 static int virtnet_send_rx_notf_coal_cmds(struct virtnet_info *vi,
5048 struct ethtool_coalesce *ec)
5049 {
5050 struct virtio_net_ctrl_coal_rx *coal_rx __free(kfree) = NULL;
5051 bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce;
5052 struct scatterlist sgs_rx;
5053 int i;
5054
5055 if (rx_ctrl_dim_on && !virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
5056 return -EOPNOTSUPP;
5057
5058 if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != vi->intr_coal_rx.max_usecs ||
5059 ec->rx_max_coalesced_frames != vi->intr_coal_rx.max_packets))
5060 return -EINVAL;
5061
5062 if (rx_ctrl_dim_on && !vi->rx_dim_enabled) {
5063 vi->rx_dim_enabled = true;
5064 for (i = 0; i < vi->max_queue_pairs; i++) {
5065 mutex_lock(&vi->rq[i].dim_lock);
5066 vi->rq[i].dim_enabled = true;
5067 mutex_unlock(&vi->rq[i].dim_lock);
5068 }
5069 return 0;
5070 }
5071
5072 coal_rx = kzalloc(sizeof(*coal_rx), GFP_KERNEL);
5073 if (!coal_rx)
5074 return -ENOMEM;
5075
5076 if (!rx_ctrl_dim_on && vi->rx_dim_enabled) {
5077 vi->rx_dim_enabled = false;
5078 for (i = 0; i < vi->max_queue_pairs; i++) {
5079 mutex_lock(&vi->rq[i].dim_lock);
5080 vi->rq[i].dim_enabled = false;
5081 mutex_unlock(&vi->rq[i].dim_lock);
5082 }
5083 }
5084
5085 /* Since the per-queue coalescing params can be set,
5086 * we need apply the global new params even if they
5087 * are not updated.
5088 */
5089 coal_rx->rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs);
5090 coal_rx->rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames);
5091 sg_init_one(&sgs_rx, coal_rx, sizeof(*coal_rx));
5092
5093 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
5094 VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
5095 &sgs_rx))
5096 return -EINVAL;
5097
5098 vi->intr_coal_rx.max_usecs = ec->rx_coalesce_usecs;
5099 vi->intr_coal_rx.max_packets = ec->rx_max_coalesced_frames;
5100 for (i = 0; i < vi->max_queue_pairs; i++) {
5101 mutex_lock(&vi->rq[i].dim_lock);
5102 vi->rq[i].intr_coal.max_usecs = ec->rx_coalesce_usecs;
5103 vi->rq[i].intr_coal.max_packets = ec->rx_max_coalesced_frames;
5104 mutex_unlock(&vi->rq[i].dim_lock);
5105 }
5106
5107 return 0;
5108 }
5109
5110 static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
5111 struct ethtool_coalesce *ec)
5112 {
5113 int err;
5114
5115 err = virtnet_send_tx_notf_coal_cmds(vi, ec);
5116 if (err)
5117 return err;
5118
5119 err = virtnet_send_rx_notf_coal_cmds(vi, ec);
5120 if (err)
5121 return err;
5122
5123 return 0;
5124 }
5125
5126 static int virtnet_send_rx_notf_coal_vq_cmds(struct virtnet_info *vi,
5127 struct ethtool_coalesce *ec,
5128 u16 queue)
5129 {
5130 bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce;
5131 u32 max_usecs, max_packets;
5132 bool cur_rx_dim;
5133 int err;
5134
5135 mutex_lock(&vi->rq[queue].dim_lock);
5136 cur_rx_dim = vi->rq[queue].dim_enabled;
5137 max_usecs = vi->rq[queue].intr_coal.max_usecs;
5138 max_packets = vi->rq[queue].intr_coal.max_packets;
5139
5140 if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != max_usecs ||
5141 ec->rx_max_coalesced_frames != max_packets)) {
5142 mutex_unlock(&vi->rq[queue].dim_lock);
5143 return -EINVAL;
5144 }
5145
5146 if (rx_ctrl_dim_on && !cur_rx_dim) {
5147 vi->rq[queue].dim_enabled = true;
5148 mutex_unlock(&vi->rq[queue].dim_lock);
5149 return 0;
5150 }
5151
5152 if (!rx_ctrl_dim_on && cur_rx_dim)
5153 vi->rq[queue].dim_enabled = false;
5154
5155 /* If no params are updated, userspace ethtool will
5156 * reject the modification.
5157 */
5158 err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, queue,
5159 ec->rx_coalesce_usecs,
5160 ec->rx_max_coalesced_frames);
5161 mutex_unlock(&vi->rq[queue].dim_lock);
5162 return err;
5163 }
5164
5165 static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
5166 struct ethtool_coalesce *ec,
5167 u16 queue)
5168 {
5169 int err;
5170
5171 err = virtnet_send_rx_notf_coal_vq_cmds(vi, ec, queue);
5172 if (err)
5173 return err;
5174
5175 err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue,
5176 ec->tx_coalesce_usecs,
5177 ec->tx_max_coalesced_frames);
5178 if (err)
5179 return err;
5180
5181 return 0;
5182 }
5183
5184 static void virtnet_rx_dim_work(struct work_struct *work)
5185 {
5186 struct dim *dim = container_of(work, struct dim, work);
5187 struct receive_queue *rq = container_of(dim,
5188 struct receive_queue, dim);
5189 struct virtnet_info *vi = rq->vq->vdev->priv;
5190 struct net_device *dev = vi->dev;
5191 struct dim_cq_moder update_moder;
5192 int qnum, err;
5193
5194 qnum = rq - vi->rq;
5195
5196 mutex_lock(&rq->dim_lock);
5197 if (!rq->dim_enabled)
5198 goto out;
5199
5200 update_moder = net_dim_get_rx_irq_moder(dev, dim);
5201 if (update_moder.usec != rq->intr_coal.max_usecs ||
5202 update_moder.pkts != rq->intr_coal.max_packets) {
5203 err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, qnum,
5204 update_moder.usec,
5205 update_moder.pkts);
5206 if (err)
5207 pr_debug("%s: Failed to send dim parameters on rxq%d\n",
5208 dev->name, qnum);
5209 }
5210 out:
5211 dim->state = DIM_START_MEASURE;
5212 mutex_unlock(&rq->dim_lock);
5213 }
5214
5215 static int virtnet_coal_params_supported(struct ethtool_coalesce *ec)
5216 {
5217 /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL
5218 * or VIRTIO_NET_F_VQ_NOTF_COAL feature is negotiated.
5219 */
5220 if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs)
5221 return -EOPNOTSUPP;
5222
5223 if (ec->tx_max_coalesced_frames > 1 ||
5224 ec->rx_max_coalesced_frames != 1)
5225 return -EINVAL;
5226
5227 return 0;
5228 }
5229
5230 static int virtnet_should_update_vq_weight(int dev_flags, int weight,
5231 int vq_weight, bool *should_update)
5232 {
5233 if (weight ^ vq_weight) {
5234 if (dev_flags & IFF_UP)
5235 return -EBUSY;
5236 *should_update = true;
5237 }
5238
5239 return 0;
5240 }
5241
5242 static int virtnet_set_coalesce(struct net_device *dev,
5243 struct ethtool_coalesce *ec,
5244 struct kernel_ethtool_coalesce *kernel_coal,
5245 struct netlink_ext_ack *extack)
5246 {
5247 struct virtnet_info *vi = netdev_priv(dev);
5248 int ret, queue_number, napi_weight, i;
5249 bool update_napi = false;
5250
5251 /* Can't change NAPI weight if the link is up */
5252 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
5253 for (queue_number = 0; queue_number < vi->max_queue_pairs; queue_number++) {
5254 ret = virtnet_should_update_vq_weight(dev->flags, napi_weight,
5255 vi->sq[queue_number].napi.weight,
5256 &update_napi);
5257 if (ret)
5258 return ret;
5259
5260 if (update_napi) {
5261 /* All queues that belong to [queue_number, vi->max_queue_pairs] will be
5262 * updated for the sake of simplicity, which might not be necessary
5263 */
5264 break;
5265 }
5266 }
5267
5268 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL))
5269 ret = virtnet_send_notf_coal_cmds(vi, ec);
5270 else
5271 ret = virtnet_coal_params_supported(ec);
5272
5273 if (ret)
5274 return ret;
5275
5276 if (update_napi) {
5277 /* xsk xmit depends on the tx napi. So if xsk is active,
5278 * prevent modifications to tx napi.
5279 */
5280 for (i = queue_number; i < vi->max_queue_pairs; i++) {
5281 if (vi->sq[i].xsk_pool)
5282 return -EBUSY;
5283 }
5284
5285 for (; queue_number < vi->max_queue_pairs; queue_number++)
5286 vi->sq[queue_number].napi.weight = napi_weight;
5287 }
5288
5289 return ret;
5290 }
5291
5292 static int virtnet_get_coalesce(struct net_device *dev,
5293 struct ethtool_coalesce *ec,
5294 struct kernel_ethtool_coalesce *kernel_coal,
5295 struct netlink_ext_ack *extack)
5296 {
5297 struct virtnet_info *vi = netdev_priv(dev);
5298
5299 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
5300 ec->rx_coalesce_usecs = vi->intr_coal_rx.max_usecs;
5301 ec->tx_coalesce_usecs = vi->intr_coal_tx.max_usecs;
5302 ec->tx_max_coalesced_frames = vi->intr_coal_tx.max_packets;
5303 ec->rx_max_coalesced_frames = vi->intr_coal_rx.max_packets;
5304 ec->use_adaptive_rx_coalesce = vi->rx_dim_enabled;
5305 } else {
5306 ec->rx_max_coalesced_frames = 1;
5307
5308 if (vi->sq[0].napi.weight)
5309 ec->tx_max_coalesced_frames = 1;
5310 }
5311
5312 return 0;
5313 }
5314
5315 static int virtnet_set_per_queue_coalesce(struct net_device *dev,
5316 u32 queue,
5317 struct ethtool_coalesce *ec)
5318 {
5319 struct virtnet_info *vi = netdev_priv(dev);
5320 int ret, napi_weight;
5321 bool update_napi = false;
5322
5323 if (queue >= vi->max_queue_pairs)
5324 return -EINVAL;
5325
5326 /* Can't change NAPI weight if the link is up */
5327 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
5328 ret = virtnet_should_update_vq_weight(dev->flags, napi_weight,
5329 vi->sq[queue].napi.weight,
5330 &update_napi);
5331 if (ret)
5332 return ret;
5333
5334 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
5335 ret = virtnet_send_notf_coal_vq_cmds(vi, ec, queue);
5336 else
5337 ret = virtnet_coal_params_supported(ec);
5338
5339 if (ret)
5340 return ret;
5341
5342 if (update_napi)
5343 vi->sq[queue].napi.weight = napi_weight;
5344
5345 return 0;
5346 }
5347
5348 static int virtnet_get_per_queue_coalesce(struct net_device *dev,
5349 u32 queue,
5350 struct ethtool_coalesce *ec)
5351 {
5352 struct virtnet_info *vi = netdev_priv(dev);
5353
5354 if (queue >= vi->max_queue_pairs)
5355 return -EINVAL;
5356
5357 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) {
5358 mutex_lock(&vi->rq[queue].dim_lock);
5359 ec->rx_coalesce_usecs = vi->rq[queue].intr_coal.max_usecs;
5360 ec->tx_coalesce_usecs = vi->sq[queue].intr_coal.max_usecs;
5361 ec->tx_max_coalesced_frames = vi->sq[queue].intr_coal.max_packets;
5362 ec->rx_max_coalesced_frames = vi->rq[queue].intr_coal.max_packets;
5363 ec->use_adaptive_rx_coalesce = vi->rq[queue].dim_enabled;
5364 mutex_unlock(&vi->rq[queue].dim_lock);
5365 } else {
5366 ec->rx_max_coalesced_frames = 1;
5367
5368 if (vi->sq[queue].napi.weight)
5369 ec->tx_max_coalesced_frames = 1;
5370 }
5371
5372 return 0;
5373 }
5374
5375 static void virtnet_init_settings(struct net_device *dev)
5376 {
5377 struct virtnet_info *vi = netdev_priv(dev);
5378
5379 vi->speed = SPEED_UNKNOWN;
5380 vi->duplex = DUPLEX_UNKNOWN;
5381 }
5382
5383 static u32 virtnet_get_rxfh_key_size(struct net_device *dev)
5384 {
5385 return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size;
5386 }
5387
5388 static u32 virtnet_get_rxfh_indir_size(struct net_device *dev)
5389 {
5390 return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size;
5391 }
5392
5393 static int virtnet_get_rxfh(struct net_device *dev,
5394 struct ethtool_rxfh_param *rxfh)
5395 {
5396 struct virtnet_info *vi = netdev_priv(dev);
5397 int i;
5398
5399 if (rxfh->indir) {
5400 for (i = 0; i < vi->rss_indir_table_size; ++i)
5401 rxfh->indir[i] = vi->rss.indirection_table[i];
5402 }
5403
5404 if (rxfh->key)
5405 memcpy(rxfh->key, vi->rss.key, vi->rss_key_size);
5406
5407 rxfh->hfunc = ETH_RSS_HASH_TOP;
5408
5409 return 0;
5410 }
5411
5412 static int virtnet_set_rxfh(struct net_device *dev,
5413 struct ethtool_rxfh_param *rxfh,
5414 struct netlink_ext_ack *extack)
5415 {
5416 struct virtnet_info *vi = netdev_priv(dev);
5417 bool update = false;
5418 int i;
5419
5420 if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
5421 rxfh->hfunc != ETH_RSS_HASH_TOP)
5422 return -EOPNOTSUPP;
5423
5424 if (rxfh->indir) {
5425 if (!vi->has_rss)
5426 return -EOPNOTSUPP;
5427
5428 for (i = 0; i < vi->rss_indir_table_size; ++i)
5429 vi->rss.indirection_table[i] = rxfh->indir[i];
5430 update = true;
5431 }
5432
5433 if (rxfh->key) {
5434 /* If either _F_HASH_REPORT or _F_RSS are negotiated, the
5435 * device provides hash calculation capabilities, that is,
5436 * hash_key is configured.
5437 */
5438 if (!vi->has_rss && !vi->has_rss_hash_report)
5439 return -EOPNOTSUPP;
5440
5441 memcpy(vi->rss.key, rxfh->key, vi->rss_key_size);
5442 update = true;
5443 }
5444
5445 if (update)
5446 virtnet_commit_rss_command(vi);
5447
5448 return 0;
5449 }
5450
5451 static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs)
5452 {
5453 struct virtnet_info *vi = netdev_priv(dev);
5454 int rc = 0;
5455
5456 switch (info->cmd) {
5457 case ETHTOOL_GRXRINGS:
5458 info->data = vi->curr_queue_pairs;
5459 break;
5460 case ETHTOOL_GRXFH:
5461 virtnet_get_hashflow(vi, info);
5462 break;
5463 default:
5464 rc = -EOPNOTSUPP;
5465 }
5466
5467 return rc;
5468 }
5469
5470 static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info)
5471 {
5472 struct virtnet_info *vi = netdev_priv(dev);
5473 int rc = 0;
5474
5475 switch (info->cmd) {
5476 case ETHTOOL_SRXFH:
5477 if (!virtnet_set_hashflow(vi, info))
5478 rc = -EINVAL;
5479
5480 break;
5481 default:
5482 rc = -EOPNOTSUPP;
5483 }
5484
5485 return rc;
5486 }
5487
5488 static const struct ethtool_ops virtnet_ethtool_ops = {
5489 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
5490 ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
5491 .get_drvinfo = virtnet_get_drvinfo,
5492 .get_link = ethtool_op_get_link,
5493 .get_ringparam = virtnet_get_ringparam,
5494 .set_ringparam = virtnet_set_ringparam,
5495 .get_strings = virtnet_get_strings,
5496 .get_sset_count = virtnet_get_sset_count,
5497 .get_ethtool_stats = virtnet_get_ethtool_stats,
5498 .set_channels = virtnet_set_channels,
5499 .get_channels = virtnet_get_channels,
5500 .get_ts_info = ethtool_op_get_ts_info,
5501 .get_link_ksettings = virtnet_get_link_ksettings,
5502 .set_link_ksettings = virtnet_set_link_ksettings,
5503 .set_coalesce = virtnet_set_coalesce,
5504 .get_coalesce = virtnet_get_coalesce,
5505 .set_per_queue_coalesce = virtnet_set_per_queue_coalesce,
5506 .get_per_queue_coalesce = virtnet_get_per_queue_coalesce,
5507 .get_rxfh_key_size = virtnet_get_rxfh_key_size,
5508 .get_rxfh_indir_size = virtnet_get_rxfh_indir_size,
5509 .get_rxfh = virtnet_get_rxfh,
5510 .set_rxfh = virtnet_set_rxfh,
5511 .get_rxnfc = virtnet_get_rxnfc,
5512 .set_rxnfc = virtnet_set_rxnfc,
5513 };
5514
5515 static void virtnet_get_queue_stats_rx(struct net_device *dev, int i,
5516 struct netdev_queue_stats_rx *stats)
5517 {
5518 struct virtnet_info *vi = netdev_priv(dev);
5519 struct receive_queue *rq = &vi->rq[i];
5520 struct virtnet_stats_ctx ctx = {0};
5521
5522 virtnet_stats_ctx_init(vi, &ctx, (void *)stats, true);
5523
5524 virtnet_get_hw_stats(vi, &ctx, i * 2);
5525 virtnet_fill_stats(vi, i * 2, &ctx, (void *)&rq->stats, true, 0);
5526 }
5527
5528 static void virtnet_get_queue_stats_tx(struct net_device *dev, int i,
5529 struct netdev_queue_stats_tx *stats)
5530 {
5531 struct virtnet_info *vi = netdev_priv(dev);
5532 struct send_queue *sq = &vi->sq[i];
5533 struct virtnet_stats_ctx ctx = {0};
5534
5535 virtnet_stats_ctx_init(vi, &ctx, (void *)stats, true);
5536
5537 virtnet_get_hw_stats(vi, &ctx, i * 2 + 1);
5538 virtnet_fill_stats(vi, i * 2 + 1, &ctx, (void *)&sq->stats, true, 0);
5539 }
5540
5541 static void virtnet_get_base_stats(struct net_device *dev,
5542 struct netdev_queue_stats_rx *rx,
5543 struct netdev_queue_stats_tx *tx)
5544 {
5545 struct virtnet_info *vi = netdev_priv(dev);
5546
5547 /* The queue stats of the virtio-net will not be reset. So here we
5548 * return 0.
5549 */
5550 rx->bytes = 0;
5551 rx->packets = 0;
5552
5553 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_BASIC) {
5554 rx->hw_drops = 0;
5555 rx->hw_drop_overruns = 0;
5556 }
5557
5558 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_CSUM) {
5559 rx->csum_unnecessary = 0;
5560 rx->csum_none = 0;
5561 rx->csum_bad = 0;
5562 }
5563
5564 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_GSO) {
5565 rx->hw_gro_packets = 0;
5566 rx->hw_gro_bytes = 0;
5567 rx->hw_gro_wire_packets = 0;
5568 rx->hw_gro_wire_bytes = 0;
5569 }
5570
5571 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_RX_SPEED)
5572 rx->hw_drop_ratelimits = 0;
5573
5574 tx->bytes = 0;
5575 tx->packets = 0;
5576 tx->stop = 0;
5577 tx->wake = 0;
5578
5579 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_BASIC) {
5580 tx->hw_drops = 0;
5581 tx->hw_drop_errors = 0;
5582 }
5583
5584 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_CSUM) {
5585 tx->csum_none = 0;
5586 tx->needs_csum = 0;
5587 }
5588
5589 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_GSO) {
5590 tx->hw_gso_packets = 0;
5591 tx->hw_gso_bytes = 0;
5592 tx->hw_gso_wire_packets = 0;
5593 tx->hw_gso_wire_bytes = 0;
5594 }
5595
5596 if (vi->device_stats_cap & VIRTIO_NET_STATS_TYPE_TX_SPEED)
5597 tx->hw_drop_ratelimits = 0;
5598 }
5599
5600 static const struct netdev_stat_ops virtnet_stat_ops = {
5601 .get_queue_stats_rx = virtnet_get_queue_stats_rx,
5602 .get_queue_stats_tx = virtnet_get_queue_stats_tx,
5603 .get_base_stats = virtnet_get_base_stats,
5604 };
5605
5606 static void virtnet_freeze_down(struct virtio_device *vdev)
5607 {
5608 struct virtnet_info *vi = vdev->priv;
5609
5610 /* Make sure no work handler is accessing the device */
5611 flush_work(&vi->config_work);
5612 disable_rx_mode_work(vi);
5613 flush_work(&vi->rx_mode_work);
5614
5615 netif_tx_lock_bh(vi->dev);
5616 netif_device_detach(vi->dev);
5617 netif_tx_unlock_bh(vi->dev);
5618 if (netif_running(vi->dev))
5619 virtnet_close(vi->dev);
5620 }
5621
5622 static int init_vqs(struct virtnet_info *vi);
5623
5624 static int virtnet_restore_up(struct virtio_device *vdev)
5625 {
5626 struct virtnet_info *vi = vdev->priv;
5627 int err;
5628
5629 err = init_vqs(vi);
5630 if (err)
5631 return err;
5632
5633 virtio_device_ready(vdev);
5634
5635 enable_delayed_refill(vi);
5636 enable_rx_mode_work(vi);
5637
5638 if (netif_running(vi->dev)) {
5639 err = virtnet_open(vi->dev);
5640 if (err)
5641 return err;
5642 }
5643
5644 netif_tx_lock_bh(vi->dev);
5645 netif_device_attach(vi->dev);
5646 netif_tx_unlock_bh(vi->dev);
5647 return err;
5648 }
5649
5650 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
5651 {
5652 __virtio64 *_offloads __free(kfree) = NULL;
5653 struct scatterlist sg;
5654
5655 _offloads = kzalloc(sizeof(*_offloads), GFP_KERNEL);
5656 if (!_offloads)
5657 return -ENOMEM;
5658
5659 *_offloads = cpu_to_virtio64(vi->vdev, offloads);
5660
5661 sg_init_one(&sg, _offloads, sizeof(*_offloads));
5662
5663 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
5664 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
5665 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
5666 return -EINVAL;
5667 }
5668
5669 return 0;
5670 }
5671
5672 static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
5673 {
5674 u64 offloads = 0;
5675
5676 if (!vi->guest_offloads)
5677 return 0;
5678
5679 return virtnet_set_guest_offloads(vi, offloads);
5680 }
5681
5682 static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
5683 {
5684 u64 offloads = vi->guest_offloads;
5685
5686 if (!vi->guest_offloads)
5687 return 0;
5688
5689 return virtnet_set_guest_offloads(vi, offloads);
5690 }
5691
5692 static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queue *rq,
5693 struct xsk_buff_pool *pool)
5694 {
5695 int err, qindex;
5696
5697 qindex = rq - vi->rq;
5698
5699 if (pool) {
5700 err = xdp_rxq_info_reg(&rq->xsk_rxq_info, vi->dev, qindex, rq->napi.napi_id);
5701 if (err < 0)
5702 return err;
5703
5704 err = xdp_rxq_info_reg_mem_model(&rq->xsk_rxq_info,
5705 MEM_TYPE_XSK_BUFF_POOL, NULL);
5706 if (err < 0)
5707 goto unreg;
5708
5709 xsk_pool_set_rxq_info(pool, &rq->xsk_rxq_info);
5710 }
5711
5712 virtnet_rx_pause(vi, rq);
5713
5714 err = virtqueue_reset(rq->vq, virtnet_rq_unmap_free_buf, NULL);
5715 if (err) {
5716 netdev_err(vi->dev, "reset rx fail: rx queue index: %d err: %d\n", qindex, err);
5717
5718 pool = NULL;
5719 }
5720
5721 rq->xsk_pool = pool;
5722
5723 virtnet_rx_resume(vi, rq);
5724
5725 if (pool)
5726 return 0;
5727
5728 unreg:
5729 xdp_rxq_info_unreg(&rq->xsk_rxq_info);
5730 return err;
5731 }
5732
5733 static int virtnet_sq_bind_xsk_pool(struct virtnet_info *vi,
5734 struct send_queue *sq,
5735 struct xsk_buff_pool *pool)
5736 {
5737 int err, qindex;
5738
5739 qindex = sq - vi->sq;
5740
5741 virtnet_tx_pause(vi, sq);
5742
5743 err = virtqueue_reset(sq->vq, virtnet_sq_free_unused_buf,
5744 virtnet_sq_free_unused_buf_done);
5745 if (err) {
5746 netdev_err(vi->dev, "reset tx fail: tx queue index: %d err: %d\n", qindex, err);
5747 pool = NULL;
5748 }
5749
5750 sq->xsk_pool = pool;
5751
5752 virtnet_tx_resume(vi, sq);
5753
5754 return err;
5755 }
5756
5757 static int virtnet_xsk_pool_enable(struct net_device *dev,
5758 struct xsk_buff_pool *pool,
5759 u16 qid)
5760 {
5761 struct virtnet_info *vi = netdev_priv(dev);
5762 struct receive_queue *rq;
5763 struct device *dma_dev;
5764 struct send_queue *sq;
5765 dma_addr_t hdr_dma;
5766 int err, size;
5767
5768 if (vi->hdr_len > xsk_pool_get_headroom(pool))
5769 return -EINVAL;
5770
5771 /* In big_packets mode, xdp cannot work, so there is no need to
5772 * initialize xsk of rq.
5773 */
5774 if (vi->big_packets && !vi->mergeable_rx_bufs)
5775 return -ENOENT;
5776
5777 if (qid >= vi->curr_queue_pairs)
5778 return -EINVAL;
5779
5780 sq = &vi->sq[qid];
5781 rq = &vi->rq[qid];
5782
5783 /* xsk assumes that tx and rx must have the same dma device. The af-xdp
5784 * may use one buffer to receive from the rx and reuse this buffer to
5785 * send by the tx. So the dma dev of sq and rq must be the same one.
5786 *
5787 * But vq->dma_dev allows every vq has the respective dma dev. So I
5788 * check the dma dev of vq and sq is the same dev.
5789 */
5790 if (virtqueue_dma_dev(rq->vq) != virtqueue_dma_dev(sq->vq))
5791 return -EINVAL;
5792
5793 dma_dev = virtqueue_dma_dev(rq->vq);
5794 if (!dma_dev)
5795 return -EINVAL;
5796
5797 size = virtqueue_get_vring_size(rq->vq);
5798
5799 rq->xsk_buffs = kvcalloc(size, sizeof(*rq->xsk_buffs), GFP_KERNEL);
5800 if (!rq->xsk_buffs)
5801 return -ENOMEM;
5802
5803 hdr_dma = virtqueue_dma_map_single_attrs(sq->vq, &xsk_hdr, vi->hdr_len,
5804 DMA_TO_DEVICE, 0);
5805 if (virtqueue_dma_mapping_error(sq->vq, hdr_dma))
5806 return -ENOMEM;
5807
5808 err = xsk_pool_dma_map(pool, dma_dev, 0);
5809 if (err)
5810 goto err_xsk_map;
5811
5812 err = virtnet_rq_bind_xsk_pool(vi, rq, pool);
5813 if (err)
5814 goto err_rq;
5815
5816 err = virtnet_sq_bind_xsk_pool(vi, sq, pool);
5817 if (err)
5818 goto err_sq;
5819
5820 /* Now, we do not support tx offload(such as tx csum), so all the tx
5821 * virtnet hdr is zero. So all the tx packets can share a single hdr.
5822 */
5823 sq->xsk_hdr_dma_addr = hdr_dma;
5824
5825 return 0;
5826
5827 err_sq:
5828 virtnet_rq_bind_xsk_pool(vi, rq, NULL);
5829 err_rq:
5830 xsk_pool_dma_unmap(pool, 0);
5831 err_xsk_map:
5832 virtqueue_dma_unmap_single_attrs(rq->vq, hdr_dma, vi->hdr_len,
5833 DMA_TO_DEVICE, 0);
5834 return err;
5835 }
5836
5837 static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
5838 {
5839 struct virtnet_info *vi = netdev_priv(dev);
5840 struct xsk_buff_pool *pool;
5841 struct receive_queue *rq;
5842 struct send_queue *sq;
5843 int err;
5844
5845 if (qid >= vi->curr_queue_pairs)
5846 return -EINVAL;
5847
5848 sq = &vi->sq[qid];
5849 rq = &vi->rq[qid];
5850
5851 pool = rq->xsk_pool;
5852
5853 err = virtnet_rq_bind_xsk_pool(vi, rq, NULL);
5854 err |= virtnet_sq_bind_xsk_pool(vi, sq, NULL);
5855
5856 xsk_pool_dma_unmap(pool, 0);
5857
5858 virtqueue_dma_unmap_single_attrs(sq->vq, sq->xsk_hdr_dma_addr,
5859 vi->hdr_len, DMA_TO_DEVICE, 0);
5860 kvfree(rq->xsk_buffs);
5861
5862 return err;
5863 }
5864
5865 static int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp)
5866 {
5867 if (xdp->xsk.pool)
5868 return virtnet_xsk_pool_enable(dev, xdp->xsk.pool,
5869 xdp->xsk.queue_id);
5870 else
5871 return virtnet_xsk_pool_disable(dev, xdp->xsk.queue_id);
5872 }
5873
5874 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
5875 struct netlink_ext_ack *extack)
5876 {
5877 unsigned int room = SKB_DATA_ALIGN(XDP_PACKET_HEADROOM +
5878 sizeof(struct skb_shared_info));
5879 unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN;
5880 struct virtnet_info *vi = netdev_priv(dev);
5881 struct bpf_prog *old_prog;
5882 u16 xdp_qp = 0, curr_qp;
5883 int i, err;
5884
5885 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
5886 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
5887 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
5888 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
5889 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
5890 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) ||
5891 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) ||
5892 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) {
5893 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first");
5894 return -EOPNOTSUPP;
5895 }
5896
5897 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
5898 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
5899 return -EINVAL;
5900 }
5901
5902 if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) {
5903 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags");
5904 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz);
5905 return -EINVAL;
5906 }
5907
5908 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
5909 if (prog)
5910 xdp_qp = nr_cpu_ids;
5911
5912 /* XDP requires extra queues for XDP_TX */
5913 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
5914 netdev_warn_once(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n",
5915 curr_qp + xdp_qp, vi->max_queue_pairs);
5916 xdp_qp = 0;
5917 }
5918
5919 old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
5920 if (!prog && !old_prog)
5921 return 0;
5922
5923 if (prog)
5924 bpf_prog_add(prog, vi->max_queue_pairs - 1);
5925
5926 /* Make sure NAPI is not using any XDP TX queues for RX. */
5927 if (netif_running(dev)) {
5928 for (i = 0; i < vi->max_queue_pairs; i++) {
5929 napi_disable(&vi->rq[i].napi);
5930 virtnet_napi_tx_disable(&vi->sq[i].napi);
5931 }
5932 }
5933
5934 if (!prog) {
5935 for (i = 0; i < vi->max_queue_pairs; i++) {
5936 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
5937 if (i == 0)
5938 virtnet_restore_guest_offloads(vi);
5939 }
5940 synchronize_net();
5941 }
5942
5943 err = virtnet_set_queues(vi, curr_qp + xdp_qp);
5944 if (err)
5945 goto err;
5946 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
5947 vi->xdp_queue_pairs = xdp_qp;
5948
5949 if (prog) {
5950 vi->xdp_enabled = true;
5951 for (i = 0; i < vi->max_queue_pairs; i++) {
5952 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
5953 if (i == 0 && !old_prog)
5954 virtnet_clear_guest_offloads(vi);
5955 }
5956 if (!old_prog)
5957 xdp_features_set_redirect_target(dev, true);
5958 } else {
5959 xdp_features_clear_redirect_target(dev);
5960 vi->xdp_enabled = false;
5961 }
5962
5963 for (i = 0; i < vi->max_queue_pairs; i++) {
5964 if (old_prog)
5965 bpf_prog_put(old_prog);
5966 if (netif_running(dev)) {
5967 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
5968 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
5969 &vi->sq[i].napi);
5970 }
5971 }
5972
5973 return 0;
5974
5975 err:
5976 if (!prog) {
5977 virtnet_clear_guest_offloads(vi);
5978 for (i = 0; i < vi->max_queue_pairs; i++)
5979 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
5980 }
5981
5982 if (netif_running(dev)) {
5983 for (i = 0; i < vi->max_queue_pairs; i++) {
5984 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
5985 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
5986 &vi->sq[i].napi);
5987 }
5988 }
5989 if (prog)
5990 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
5991 return err;
5992 }
5993
5994 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
5995 {
5996 switch (xdp->command) {
5997 case XDP_SETUP_PROG:
5998 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
5999 case XDP_SETUP_XSK_POOL:
6000 return virtnet_xsk_pool_setup(dev, xdp);
6001 default:
6002 return -EINVAL;
6003 }
6004 }
6005
6006 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
6007 size_t len)
6008 {
6009 struct virtnet_info *vi = netdev_priv(dev);
6010 int ret;
6011
6012 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
6013 return -EOPNOTSUPP;
6014
6015 ret = snprintf(buf, len, "sby");
6016 if (ret >= len)
6017 return -EOPNOTSUPP;
6018
6019 return 0;
6020 }
6021
6022 static int virtnet_set_features(struct net_device *dev,
6023 netdev_features_t features)
6024 {
6025 struct virtnet_info *vi = netdev_priv(dev);
6026 u64 offloads;
6027 int err;
6028
6029 if ((dev->features ^ features) & NETIF_F_GRO_HW) {
6030 if (vi->xdp_enabled)
6031 return -EBUSY;
6032
6033 if (features & NETIF_F_GRO_HW)
6034 offloads = vi->guest_offloads_capable;
6035 else
6036 offloads = vi->guest_offloads_capable &
6037 ~GUEST_OFFLOAD_GRO_HW_MASK;
6038
6039 err = virtnet_set_guest_offloads(vi, offloads);
6040 if (err)
6041 return err;
6042 vi->guest_offloads = offloads;
6043 }
6044
6045 if ((dev->features ^ features) & NETIF_F_RXHASH) {
6046 if (features & NETIF_F_RXHASH)
6047 vi->rss.hash_types = vi->rss_hash_types_saved;
6048 else
6049 vi->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE;
6050
6051 if (!virtnet_commit_rss_command(vi))
6052 return -EINVAL;
6053 }
6054
6055 return 0;
6056 }
6057
6058 static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue)
6059 {
6060 struct virtnet_info *priv = netdev_priv(dev);
6061 struct send_queue *sq = &priv->sq[txqueue];
6062 struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue);
6063
6064 u64_stats_update_begin(&sq->stats.syncp);
6065 u64_stats_inc(&sq->stats.tx_timeouts);
6066 u64_stats_update_end(&sq->stats.syncp);
6067
6068 netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n",
6069 txqueue, sq->name, sq->vq->index, sq->vq->name,
6070 jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start)));
6071 }
6072
6073 static int virtnet_init_irq_moder(struct virtnet_info *vi)
6074 {
6075 u8 profile_flags = 0, coal_flags = 0;
6076 int ret, i;
6077
6078 profile_flags |= DIM_PROFILE_RX;
6079 coal_flags |= DIM_COALESCE_USEC | DIM_COALESCE_PKTS;
6080 ret = net_dim_init_irq_moder(vi->dev, profile_flags, coal_flags,
6081 DIM_CQ_PERIOD_MODE_START_FROM_EQE,
6082 0, virtnet_rx_dim_work, NULL);
6083
6084 if (ret)
6085 return ret;
6086
6087 for (i = 0; i < vi->max_queue_pairs; i++)
6088 net_dim_setting(vi->dev, &vi->rq[i].dim, false);
6089
6090 return 0;
6091 }
6092
6093 static void virtnet_free_irq_moder(struct virtnet_info *vi)
6094 {
6095 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
6096 return;
6097
6098 rtnl_lock();
6099 net_dim_free_irq_moder(vi->dev);
6100 rtnl_unlock();
6101 }
6102
6103 static const struct net_device_ops virtnet_netdev = {
6104 .ndo_open = virtnet_open,
6105 .ndo_stop = virtnet_close,
6106 .ndo_start_xmit = start_xmit,
6107 .ndo_validate_addr = eth_validate_addr,
6108 .ndo_set_mac_address = virtnet_set_mac_address,
6109 .ndo_set_rx_mode = virtnet_set_rx_mode,
6110 .ndo_get_stats64 = virtnet_stats,
6111 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
6112 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
6113 .ndo_bpf = virtnet_xdp,
6114 .ndo_xdp_xmit = virtnet_xdp_xmit,
6115 .ndo_xsk_wakeup = virtnet_xsk_wakeup,
6116 .ndo_features_check = passthru_features_check,
6117 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
6118 .ndo_set_features = virtnet_set_features,
6119 .ndo_tx_timeout = virtnet_tx_timeout,
6120 };
6121
6122 static void virtnet_config_changed_work(struct work_struct *work)
6123 {
6124 struct virtnet_info *vi =
6125 container_of(work, struct virtnet_info, config_work);
6126 u16 v;
6127
6128 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
6129 struct virtio_net_config, status, &v) < 0)
6130 return;
6131
6132 if (v & VIRTIO_NET_S_ANNOUNCE) {
6133 netdev_notify_peers(vi->dev);
6134 virtnet_ack_link_announce(vi);
6135 }
6136
6137 /* Ignore unknown (future) status bits */
6138 v &= VIRTIO_NET_S_LINK_UP;
6139
6140 if (vi->status == v)
6141 return;
6142
6143 vi->status = v;
6144
6145 if (vi->status & VIRTIO_NET_S_LINK_UP) {
6146 virtnet_update_settings(vi);
6147 netif_carrier_on(vi->dev);
6148 netif_tx_wake_all_queues(vi->dev);
6149 } else {
6150 netif_carrier_off(vi->dev);
6151 netif_tx_stop_all_queues(vi->dev);
6152 }
6153 }
6154
6155 static void virtnet_config_changed(struct virtio_device *vdev)
6156 {
6157 struct virtnet_info *vi = vdev->priv;
6158
6159 schedule_work(&vi->config_work);
6160 }
6161
6162 static void virtnet_free_queues(struct virtnet_info *vi)
6163 {
6164 int i;
6165
6166 for (i = 0; i < vi->max_queue_pairs; i++) {
6167 __netif_napi_del(&vi->rq[i].napi);
6168 __netif_napi_del(&vi->sq[i].napi);
6169 }
6170
6171 /* We called __netif_napi_del(),
6172 * we need to respect an RCU grace period before freeing vi->rq
6173 */
6174 synchronize_net();
6175
6176 kfree(vi->rq);
6177 kfree(vi->sq);
6178 kfree(vi->ctrl);
6179 }
6180
6181 static void _free_receive_bufs(struct virtnet_info *vi)
6182 {
6183 struct bpf_prog *old_prog;
6184 int i;
6185
6186 for (i = 0; i < vi->max_queue_pairs; i++) {
6187 while (vi->rq[i].pages)
6188 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
6189
6190 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
6191 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
6192 if (old_prog)
6193 bpf_prog_put(old_prog);
6194 }
6195 }
6196
6197 static void free_receive_bufs(struct virtnet_info *vi)
6198 {
6199 rtnl_lock();
6200 _free_receive_bufs(vi);
6201 rtnl_unlock();
6202 }
6203
6204 static void free_receive_page_frags(struct virtnet_info *vi)
6205 {
6206 int i;
6207 for (i = 0; i < vi->max_queue_pairs; i++)
6208 if (vi->rq[i].alloc_frag.page) {
6209 if (vi->rq[i].last_dma)
6210 virtnet_rq_unmap(&vi->rq[i], vi->rq[i].last_dma, 0);
6211 put_page(vi->rq[i].alloc_frag.page);
6212 }
6213 }
6214
6215 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
6216 {
6217 struct virtnet_info *vi = vq->vdev->priv;
6218 struct send_queue *sq;
6219 int i = vq2txq(vq);
6220
6221 sq = &vi->sq[i];
6222
6223 switch (virtnet_xmit_ptr_unpack(&buf)) {
6224 case VIRTNET_XMIT_TYPE_SKB:
6225 case VIRTNET_XMIT_TYPE_SKB_ORPHAN:
6226 dev_kfree_skb(buf);
6227 break;
6228
6229 case VIRTNET_XMIT_TYPE_XDP:
6230 xdp_return_frame(buf);
6231 break;
6232
6233 case VIRTNET_XMIT_TYPE_XSK:
6234 xsk_tx_completed(sq->xsk_pool, 1);
6235 break;
6236 }
6237 }
6238
6239 static void virtnet_sq_free_unused_buf_done(struct virtqueue *vq)
6240 {
6241 struct virtnet_info *vi = vq->vdev->priv;
6242 int i = vq2txq(vq);
6243
6244 netdev_tx_reset_queue(netdev_get_tx_queue(vi->dev, i));
6245 }
6246
6247 static void free_unused_bufs(struct virtnet_info *vi)
6248 {
6249 void *buf;
6250 int i;
6251
6252 for (i = 0; i < vi->max_queue_pairs; i++) {
6253 struct virtqueue *vq = vi->sq[i].vq;
6254 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
6255 virtnet_sq_free_unused_buf(vq, buf);
6256 cond_resched();
6257 }
6258
6259 for (i = 0; i < vi->max_queue_pairs; i++) {
6260 struct virtqueue *vq = vi->rq[i].vq;
6261
6262 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
6263 virtnet_rq_unmap_free_buf(vq, buf);
6264 cond_resched();
6265 }
6266 }
6267
6268 static void virtnet_del_vqs(struct virtnet_info *vi)
6269 {
6270 struct virtio_device *vdev = vi->vdev;
6271
6272 virtnet_clean_affinity(vi);
6273
6274 vdev->config->del_vqs(vdev);
6275
6276 virtnet_free_queues(vi);
6277 }
6278
6279 /* How large should a single buffer be so a queue full of these can fit at
6280 * least one full packet?
6281 * Logic below assumes the mergeable buffer header is used.
6282 */
6283 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
6284 {
6285 const unsigned int hdr_len = vi->hdr_len;
6286 unsigned int rq_size = virtqueue_get_vring_size(vq);
6287 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
6288 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
6289 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
6290
6291 return max(max(min_buf_len, hdr_len) - hdr_len,
6292 (unsigned int)GOOD_PACKET_LEN);
6293 }
6294
6295 static int virtnet_find_vqs(struct virtnet_info *vi)
6296 {
6297 struct virtqueue_info *vqs_info;
6298 struct virtqueue **vqs;
6299 int ret = -ENOMEM;
6300 int total_vqs;
6301 bool *ctx;
6302 u16 i;
6303
6304 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
6305 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
6306 * possible control vq.
6307 */
6308 total_vqs = vi->max_queue_pairs * 2 +
6309 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
6310
6311 /* Allocate space for find_vqs parameters */
6312 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
6313 if (!vqs)
6314 goto err_vq;
6315 vqs_info = kcalloc(total_vqs, sizeof(*vqs_info), GFP_KERNEL);
6316 if (!vqs_info)
6317 goto err_vqs_info;
6318 if (!vi->big_packets || vi->mergeable_rx_bufs) {
6319 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
6320 if (!ctx)
6321 goto err_ctx;
6322 } else {
6323 ctx = NULL;
6324 }
6325
6326 /* Parameters for control virtqueue, if any */
6327 if (vi->has_cvq) {
6328 vqs_info[total_vqs - 1].name = "control";
6329 }
6330
6331 /* Allocate/initialize parameters for send/receive virtqueues */
6332 for (i = 0; i < vi->max_queue_pairs; i++) {
6333 vqs_info[rxq2vq(i)].callback = skb_recv_done;
6334 vqs_info[txq2vq(i)].callback = skb_xmit_done;
6335 sprintf(vi->rq[i].name, "input.%u", i);
6336 sprintf(vi->sq[i].name, "output.%u", i);
6337 vqs_info[rxq2vq(i)].name = vi->rq[i].name;
6338 vqs_info[txq2vq(i)].name = vi->sq[i].name;
6339 if (ctx)
6340 vqs_info[rxq2vq(i)].ctx = true;
6341 }
6342
6343 ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, vqs_info, NULL);
6344 if (ret)
6345 goto err_find;
6346
6347 if (vi->has_cvq) {
6348 vi->cvq = vqs[total_vqs - 1];
6349 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
6350 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
6351 }
6352
6353 for (i = 0; i < vi->max_queue_pairs; i++) {
6354 vi->rq[i].vq = vqs[rxq2vq(i)];
6355 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
6356 vi->sq[i].vq = vqs[txq2vq(i)];
6357 }
6358
6359 /* run here: ret == 0. */
6360
6361
6362 err_find:
6363 kfree(ctx);
6364 err_ctx:
6365 kfree(vqs_info);
6366 err_vqs_info:
6367 kfree(vqs);
6368 err_vq:
6369 return ret;
6370 }
6371
6372 static int virtnet_alloc_queues(struct virtnet_info *vi)
6373 {
6374 int i;
6375
6376 if (vi->has_cvq) {
6377 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
6378 if (!vi->ctrl)
6379 goto err_ctrl;
6380 } else {
6381 vi->ctrl = NULL;
6382 }
6383 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
6384 if (!vi->sq)
6385 goto err_sq;
6386 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
6387 if (!vi->rq)
6388 goto err_rq;
6389
6390 INIT_DELAYED_WORK(&vi->refill, refill_work);
6391 for (i = 0; i < vi->max_queue_pairs; i++) {
6392 vi->rq[i].pages = NULL;
6393 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll,
6394 napi_weight);
6395 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi,
6396 virtnet_poll_tx,
6397 napi_tx ? napi_weight : 0);
6398
6399 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
6400 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
6401 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
6402
6403 u64_stats_init(&vi->rq[i].stats.syncp);
6404 u64_stats_init(&vi->sq[i].stats.syncp);
6405 mutex_init(&vi->rq[i].dim_lock);
6406 }
6407
6408 return 0;
6409
6410 err_rq:
6411 kfree(vi->sq);
6412 err_sq:
6413 kfree(vi->ctrl);
6414 err_ctrl:
6415 return -ENOMEM;
6416 }
6417
6418 static int init_vqs(struct virtnet_info *vi)
6419 {
6420 int ret;
6421
6422 /* Allocate send & receive queues */
6423 ret = virtnet_alloc_queues(vi);
6424 if (ret)
6425 goto err;
6426
6427 ret = virtnet_find_vqs(vi);
6428 if (ret)
6429 goto err_free;
6430
6431 cpus_read_lock();
6432 virtnet_set_affinity(vi);
6433 cpus_read_unlock();
6434
6435 return 0;
6436
6437 err_free:
6438 virtnet_free_queues(vi);
6439 err:
6440 return ret;
6441 }
6442
6443 #ifdef CONFIG_SYSFS
6444 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
6445 char *buf)
6446 {
6447 struct virtnet_info *vi = netdev_priv(queue->dev);
6448 unsigned int queue_index = get_netdev_rx_queue_index(queue);
6449 unsigned int headroom = virtnet_get_headroom(vi);
6450 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
6451 struct ewma_pkt_len *avg;
6452
6453 BUG_ON(queue_index >= vi->max_queue_pairs);
6454 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
6455 return sprintf(buf, "%u\n",
6456 get_mergeable_buf_len(&vi->rq[queue_index], avg,
6457 SKB_DATA_ALIGN(headroom + tailroom)));
6458 }
6459
6460 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
6461 __ATTR_RO(mergeable_rx_buffer_size);
6462
6463 static struct attribute *virtio_net_mrg_rx_attrs[] = {
6464 &mergeable_rx_buffer_size_attribute.attr,
6465 NULL
6466 };
6467
6468 static const struct attribute_group virtio_net_mrg_rx_group = {
6469 .name = "virtio_net",
6470 .attrs = virtio_net_mrg_rx_attrs
6471 };
6472 #endif
6473
6474 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
6475 unsigned int fbit,
6476 const char *fname, const char *dname)
6477 {
6478 if (!virtio_has_feature(vdev, fbit))
6479 return false;
6480
6481 dev_err(&vdev->dev, "device advertises feature %s but not %s",
6482 fname, dname);
6483
6484 return true;
6485 }
6486
6487 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
6488 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
6489
6490 static bool virtnet_validate_features(struct virtio_device *vdev)
6491 {
6492 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
6493 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
6494 "VIRTIO_NET_F_CTRL_VQ") ||
6495 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
6496 "VIRTIO_NET_F_CTRL_VQ") ||
6497 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
6498 "VIRTIO_NET_F_CTRL_VQ") ||
6499 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
6500 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
6501 "VIRTIO_NET_F_CTRL_VQ") ||
6502 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS,
6503 "VIRTIO_NET_F_CTRL_VQ") ||
6504 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
6505 "VIRTIO_NET_F_CTRL_VQ") ||
6506 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL,
6507 "VIRTIO_NET_F_CTRL_VQ") ||
6508 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_VQ_NOTF_COAL,
6509 "VIRTIO_NET_F_CTRL_VQ"))) {
6510 return false;
6511 }
6512
6513 return true;
6514 }
6515
6516 #define MIN_MTU ETH_MIN_MTU
6517 #define MAX_MTU ETH_MAX_MTU
6518
6519 static int virtnet_validate(struct virtio_device *vdev)
6520 {
6521 if (!vdev->config->get) {
6522 dev_err(&vdev->dev, "%s failure: config access disabled\n",
6523 __func__);
6524 return -EINVAL;
6525 }
6526
6527 if (!virtnet_validate_features(vdev))
6528 return -EINVAL;
6529
6530 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
6531 int mtu = virtio_cread16(vdev,
6532 offsetof(struct virtio_net_config,
6533 mtu));
6534 if (mtu < MIN_MTU)
6535 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
6536 }
6537
6538 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) &&
6539 !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
6540 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby");
6541 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY);
6542 }
6543
6544 return 0;
6545 }
6546
6547 static bool virtnet_check_guest_gso(const struct virtnet_info *vi)
6548 {
6549 return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
6550 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
6551 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
6552 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
6553 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) &&
6554 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6));
6555 }
6556
6557 static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu)
6558 {
6559 bool guest_gso = virtnet_check_guest_gso(vi);
6560
6561 /* If device can receive ANY guest GSO packets, regardless of mtu,
6562 * allocate packets of maximum size, otherwise limit it to only
6563 * mtu size worth only.
6564 */
6565 if (mtu > ETH_DATA_LEN || guest_gso) {
6566 vi->big_packets = true;
6567 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE);
6568 }
6569 }
6570
6571 #define VIRTIO_NET_HASH_REPORT_MAX_TABLE 10
6572 static enum xdp_rss_hash_type
6573 virtnet_xdp_rss_type[VIRTIO_NET_HASH_REPORT_MAX_TABLE] = {
6574 [VIRTIO_NET_HASH_REPORT_NONE] = XDP_RSS_TYPE_NONE,
6575 [VIRTIO_NET_HASH_REPORT_IPv4] = XDP_RSS_TYPE_L3_IPV4,
6576 [VIRTIO_NET_HASH_REPORT_TCPv4] = XDP_RSS_TYPE_L4_IPV4_TCP,
6577 [VIRTIO_NET_HASH_REPORT_UDPv4] = XDP_RSS_TYPE_L4_IPV4_UDP,
6578 [VIRTIO_NET_HASH_REPORT_IPv6] = XDP_RSS_TYPE_L3_IPV6,
6579 [VIRTIO_NET_HASH_REPORT_TCPv6] = XDP_RSS_TYPE_L4_IPV6_TCP,
6580 [VIRTIO_NET_HASH_REPORT_UDPv6] = XDP_RSS_TYPE_L4_IPV6_UDP,
6581 [VIRTIO_NET_HASH_REPORT_IPv6_EX] = XDP_RSS_TYPE_L3_IPV6_EX,
6582 [VIRTIO_NET_HASH_REPORT_TCPv6_EX] = XDP_RSS_TYPE_L4_IPV6_TCP_EX,
6583 [VIRTIO_NET_HASH_REPORT_UDPv6_EX] = XDP_RSS_TYPE_L4_IPV6_UDP_EX
6584 };
6585
6586 static int virtnet_xdp_rx_hash(const struct xdp_md *_ctx, u32 *hash,
6587 enum xdp_rss_hash_type *rss_type)
6588 {
6589 const struct xdp_buff *xdp = (void *)_ctx;
6590 struct virtio_net_hdr_v1_hash *hdr_hash;
6591 struct virtnet_info *vi;
6592 u16 hash_report;
6593
6594 if (!(xdp->rxq->dev->features & NETIF_F_RXHASH))
6595 return -ENODATA;
6596
6597 vi = netdev_priv(xdp->rxq->dev);
6598 hdr_hash = (struct virtio_net_hdr_v1_hash *)(xdp->data - vi->hdr_len);
6599 hash_report = __le16_to_cpu(hdr_hash->hash_report);
6600
6601 if (hash_report >= VIRTIO_NET_HASH_REPORT_MAX_TABLE)
6602 hash_report = VIRTIO_NET_HASH_REPORT_NONE;
6603
6604 *rss_type = virtnet_xdp_rss_type[hash_report];
6605 *hash = __le32_to_cpu(hdr_hash->hash_value);
6606 return 0;
6607 }
6608
6609 static const struct xdp_metadata_ops virtnet_xdp_metadata_ops = {
6610 .xmo_rx_hash = virtnet_xdp_rx_hash,
6611 };
6612
6613 static int virtnet_probe(struct virtio_device *vdev)
6614 {
6615 int i, err = -ENOMEM;
6616 struct net_device *dev;
6617 struct virtnet_info *vi;
6618 u16 max_queue_pairs;
6619 int mtu = 0;
6620
6621 /* Find if host supports multiqueue/rss virtio_net device */
6622 max_queue_pairs = 1;
6623 if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS))
6624 max_queue_pairs =
6625 virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs));
6626
6627 /* We need at least 2 queue's */
6628 if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
6629 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
6630 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
6631 max_queue_pairs = 1;
6632
6633 /* Allocate ourselves a network device with room for our info */
6634 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
6635 if (!dev)
6636 return -ENOMEM;
6637
6638 /* Set up network device as normal. */
6639 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE |
6640 IFF_TX_SKB_NO_LINEAR;
6641 dev->netdev_ops = &virtnet_netdev;
6642 dev->stat_ops = &virtnet_stat_ops;
6643 dev->features = NETIF_F_HIGHDMA;
6644
6645 dev->ethtool_ops = &virtnet_ethtool_ops;
6646 SET_NETDEV_DEV(dev, &vdev->dev);
6647
6648 /* Do we support "hardware" checksums? */
6649 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
6650 /* This opens up the world of extra features. */
6651 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
6652 if (csum)
6653 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
6654
6655 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
6656 dev->hw_features |= NETIF_F_TSO
6657 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
6658 }
6659 /* Individual feature bits: what can host handle? */
6660 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
6661 dev->hw_features |= NETIF_F_TSO;
6662 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
6663 dev->hw_features |= NETIF_F_TSO6;
6664 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
6665 dev->hw_features |= NETIF_F_TSO_ECN;
6666 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO))
6667 dev->hw_features |= NETIF_F_GSO_UDP_L4;
6668
6669 dev->features |= NETIF_F_GSO_ROBUST;
6670
6671 if (gso)
6672 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
6673 /* (!csum && gso) case will be fixed by register_netdev() */
6674 }
6675
6676 /* 1. With VIRTIO_NET_F_GUEST_CSUM negotiation, the driver doesn't
6677 * need to calculate checksums for partially checksummed packets,
6678 * as they're considered valid by the upper layer.
6679 * 2. Without VIRTIO_NET_F_GUEST_CSUM negotiation, the driver only
6680 * receives fully checksummed packets. The device may assist in
6681 * validating these packets' checksums, so the driver won't have to.
6682 */
6683 dev->features |= NETIF_F_RXCSUM;
6684
6685 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
6686 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
6687 dev->features |= NETIF_F_GRO_HW;
6688 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
6689 dev->hw_features |= NETIF_F_GRO_HW;
6690
6691 dev->vlan_features = dev->features;
6692 dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
6693 NETDEV_XDP_ACT_XSK_ZEROCOPY;
6694
6695 /* MTU range: 68 - 65535 */
6696 dev->min_mtu = MIN_MTU;
6697 dev->max_mtu = MAX_MTU;
6698
6699 /* Configuration may specify what MAC to use. Otherwise random. */
6700 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
6701 u8 addr[ETH_ALEN];
6702
6703 virtio_cread_bytes(vdev,
6704 offsetof(struct virtio_net_config, mac),
6705 addr, ETH_ALEN);
6706 eth_hw_addr_set(dev, addr);
6707 } else {
6708 eth_hw_addr_random(dev);
6709 dev_info(&vdev->dev, "Assigned random MAC address %pM\n",
6710 dev->dev_addr);
6711 }
6712
6713 /* Set up our device-specific information */
6714 vi = netdev_priv(dev);
6715 vi->dev = dev;
6716 vi->vdev = vdev;
6717 vdev->priv = vi;
6718
6719 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
6720 INIT_WORK(&vi->rx_mode_work, virtnet_rx_mode_work);
6721 spin_lock_init(&vi->refill_lock);
6722
6723 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) {
6724 vi->mergeable_rx_bufs = true;
6725 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG;
6726 }
6727
6728 if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT))
6729 vi->has_rss_hash_report = true;
6730
6731 if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
6732 vi->has_rss = true;
6733
6734 vi->rss_indir_table_size =
6735 virtio_cread16(vdev, offsetof(struct virtio_net_config,
6736 rss_max_indirection_table_length));
6737 }
6738 err = rss_indirection_table_alloc(&vi->rss, vi->rss_indir_table_size);
6739 if (err)
6740 goto free;
6741
6742 if (vi->has_rss || vi->has_rss_hash_report) {
6743 vi->rss_key_size =
6744 virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
6745 if (vi->rss_key_size > VIRTIO_NET_RSS_MAX_KEY_SIZE) {
6746 dev_err(&vdev->dev, "rss_max_key_size=%u exceeds the limit %u.\n",
6747 vi->rss_key_size, VIRTIO_NET_RSS_MAX_KEY_SIZE);
6748 err = -EINVAL;
6749 goto free;
6750 }
6751
6752 vi->rss_hash_types_supported =
6753 virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
6754 vi->rss_hash_types_supported &=
6755 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX |
6756 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
6757 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX);
6758
6759 dev->hw_features |= NETIF_F_RXHASH;
6760 dev->xdp_metadata_ops = &virtnet_xdp_metadata_ops;
6761 }
6762
6763 if (vi->has_rss_hash_report)
6764 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
6765 else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
6766 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
6767 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
6768 else
6769 vi->hdr_len = sizeof(struct virtio_net_hdr);
6770
6771 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
6772 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
6773 vi->any_header_sg = true;
6774
6775 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
6776 vi->has_cvq = true;
6777
6778 mutex_init(&vi->cvq_lock);
6779
6780 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
6781 mtu = virtio_cread16(vdev,
6782 offsetof(struct virtio_net_config,
6783 mtu));
6784 if (mtu < dev->min_mtu) {
6785 /* Should never trigger: MTU was previously validated
6786 * in virtnet_validate.
6787 */
6788 dev_err(&vdev->dev,
6789 "device MTU appears to have changed it is now %d < %d",
6790 mtu, dev->min_mtu);
6791 err = -EINVAL;
6792 goto free;
6793 }
6794
6795 dev->mtu = mtu;
6796 dev->max_mtu = mtu;
6797 }
6798
6799 virtnet_set_big_packets(vi, mtu);
6800
6801 if (vi->any_header_sg)
6802 dev->needed_headroom = vi->hdr_len;
6803
6804 /* Enable multiqueue by default */
6805 if (num_online_cpus() >= max_queue_pairs)
6806 vi->curr_queue_pairs = max_queue_pairs;
6807 else
6808 vi->curr_queue_pairs = num_online_cpus();
6809 vi->max_queue_pairs = max_queue_pairs;
6810
6811 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
6812 err = init_vqs(vi);
6813 if (err)
6814 goto free;
6815
6816 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
6817 vi->intr_coal_rx.max_usecs = 0;
6818 vi->intr_coal_tx.max_usecs = 0;
6819 vi->intr_coal_rx.max_packets = 0;
6820
6821 /* Keep the default values of the coalescing parameters
6822 * aligned with the default napi_tx state.
6823 */
6824 if (vi->sq[0].napi.weight)
6825 vi->intr_coal_tx.max_packets = 1;
6826 else
6827 vi->intr_coal_tx.max_packets = 0;
6828 }
6829
6830 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) {
6831 /* The reason is the same as VIRTIO_NET_F_NOTF_COAL. */
6832 for (i = 0; i < vi->max_queue_pairs; i++)
6833 if (vi->sq[i].napi.weight)
6834 vi->sq[i].intr_coal.max_packets = 1;
6835
6836 err = virtnet_init_irq_moder(vi);
6837 if (err)
6838 goto free;
6839 }
6840
6841 #ifdef CONFIG_SYSFS
6842 if (vi->mergeable_rx_bufs)
6843 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
6844 #endif
6845 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
6846 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
6847
6848 virtnet_init_settings(dev);
6849
6850 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
6851 vi->failover = net_failover_create(vi->dev);
6852 if (IS_ERR(vi->failover)) {
6853 err = PTR_ERR(vi->failover);
6854 goto free_vqs;
6855 }
6856 }
6857
6858 if (vi->has_rss || vi->has_rss_hash_report)
6859 virtnet_init_default_rss(vi);
6860
6861 enable_rx_mode_work(vi);
6862
6863 /* serialize netdev register + virtio_device_ready() with ndo_open() */
6864 rtnl_lock();
6865
6866 err = register_netdevice(dev);
6867 if (err) {
6868 pr_debug("virtio_net: registering device failed\n");
6869 rtnl_unlock();
6870 goto free_failover;
6871 }
6872
6873 /* Disable config change notification until ndo_open. */
6874 virtio_config_driver_disable(vi->vdev);
6875
6876 virtio_device_ready(vdev);
6877
6878 if (vi->has_rss || vi->has_rss_hash_report) {
6879 if (!virtnet_commit_rss_command(vi)) {
6880 dev_warn(&vdev->dev, "RSS disabled because committing failed.\n");
6881 dev->hw_features &= ~NETIF_F_RXHASH;
6882 vi->has_rss_hash_report = false;
6883 vi->has_rss = false;
6884 }
6885 }
6886
6887 virtnet_set_queues(vi, vi->curr_queue_pairs);
6888
6889 /* a random MAC address has been assigned, notify the device.
6890 * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there
6891 * because many devices work fine without getting MAC explicitly
6892 */
6893 if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
6894 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
6895 struct scatterlist sg;
6896
6897 sg_init_one(&sg, dev->dev_addr, dev->addr_len);
6898 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
6899 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
6900 pr_debug("virtio_net: setting MAC address failed\n");
6901 rtnl_unlock();
6902 err = -EINVAL;
6903 goto free_unregister_netdev;
6904 }
6905 }
6906
6907 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS)) {
6908 struct virtio_net_stats_capabilities *stats_cap __free(kfree) = NULL;
6909 struct scatterlist sg;
6910 __le64 v;
6911
6912 stats_cap = kzalloc(sizeof(*stats_cap), GFP_KERNEL);
6913 if (!stats_cap) {
6914 rtnl_unlock();
6915 err = -ENOMEM;
6916 goto free_unregister_netdev;
6917 }
6918
6919 sg_init_one(&sg, stats_cap, sizeof(*stats_cap));
6920
6921 if (!virtnet_send_command_reply(vi, VIRTIO_NET_CTRL_STATS,
6922 VIRTIO_NET_CTRL_STATS_QUERY,
6923 NULL, &sg)) {
6924 pr_debug("virtio_net: fail to get stats capability\n");
6925 rtnl_unlock();
6926 err = -EINVAL;
6927 goto free_unregister_netdev;
6928 }
6929
6930 v = stats_cap->supported_stats_types[0];
6931 vi->device_stats_cap = le64_to_cpu(v);
6932 }
6933
6934 /* Assume link up if device can't report link status,
6935 otherwise get link status from config. */
6936 netif_carrier_off(dev);
6937 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
6938 virtnet_config_changed_work(&vi->config_work);
6939 } else {
6940 vi->status = VIRTIO_NET_S_LINK_UP;
6941 virtnet_update_settings(vi);
6942 netif_carrier_on(dev);
6943 }
6944
6945 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
6946 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
6947 set_bit(guest_offloads[i], &vi->guest_offloads);
6948 vi->guest_offloads_capable = vi->guest_offloads;
6949
6950 rtnl_unlock();
6951
6952 err = virtnet_cpu_notif_add(vi);
6953 if (err) {
6954 pr_debug("virtio_net: registering cpu notifier failed\n");
6955 goto free_unregister_netdev;
6956 }
6957
6958 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
6959 dev->name, max_queue_pairs);
6960
6961 return 0;
6962
6963 free_unregister_netdev:
6964 unregister_netdev(dev);
6965 free_failover:
6966 net_failover_destroy(vi->failover);
6967 free_vqs:
6968 virtio_reset_device(vdev);
6969 cancel_delayed_work_sync(&vi->refill);
6970 free_receive_page_frags(vi);
6971 virtnet_del_vqs(vi);
6972 free:
6973 free_netdev(dev);
6974 return err;
6975 }
6976
6977 static void remove_vq_common(struct virtnet_info *vi)
6978 {
6979 int i;
6980
6981 virtio_reset_device(vi->vdev);
6982
6983 /* Free unused buffers in both send and recv, if any. */
6984 free_unused_bufs(vi);
6985
6986 /*
6987 * Rule of thumb is netdev_tx_reset_queue() should follow any
6988 * skb freeing not followed by netdev_tx_completed_queue()
6989 */
6990 for (i = 0; i < vi->max_queue_pairs; i++)
6991 netdev_tx_reset_queue(netdev_get_tx_queue(vi->dev, i));
6992
6993 free_receive_bufs(vi);
6994
6995 free_receive_page_frags(vi);
6996
6997 virtnet_del_vqs(vi);
6998 }
6999
7000 static void virtnet_remove(struct virtio_device *vdev)
7001 {
7002 struct virtnet_info *vi = vdev->priv;
7003
7004 virtnet_cpu_notif_remove(vi);
7005
7006 /* Make sure no work handler is accessing the device. */
7007 flush_work(&vi->config_work);
7008 disable_rx_mode_work(vi);
7009 flush_work(&vi->rx_mode_work);
7010
7011 virtnet_free_irq_moder(vi);
7012
7013 unregister_netdev(vi->dev);
7014
7015 net_failover_destroy(vi->failover);
7016
7017 remove_vq_common(vi);
7018
7019 rss_indirection_table_free(&vi->rss);
7020
7021 free_netdev(vi->dev);
7022 }
7023
7024 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
7025 {
7026 struct virtnet_info *vi = vdev->priv;
7027
7028 virtnet_cpu_notif_remove(vi);
7029 virtnet_freeze_down(vdev);
7030 remove_vq_common(vi);
7031
7032 return 0;
7033 }
7034
7035 static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
7036 {
7037 struct virtnet_info *vi = vdev->priv;
7038 int err;
7039
7040 err = virtnet_restore_up(vdev);
7041 if (err)
7042 return err;
7043 virtnet_set_queues(vi, vi->curr_queue_pairs);
7044
7045 err = virtnet_cpu_notif_add(vi);
7046 if (err) {
7047 virtnet_freeze_down(vdev);
7048 remove_vq_common(vi);
7049 return err;
7050 }
7051
7052 return 0;
7053 }
7054
7055 static struct virtio_device_id id_table[] = {
7056 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
7057 { 0 },
7058 };
7059
7060 #define VIRTNET_FEATURES \
7061 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
7062 VIRTIO_NET_F_MAC, \
7063 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
7064 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
7065 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
7066 VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \
7067 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
7068 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
7069 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
7070 VIRTIO_NET_F_CTRL_MAC_ADDR, \
7071 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
7072 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
7073 VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \
7074 VIRTIO_NET_F_VQ_NOTF_COAL, \
7075 VIRTIO_NET_F_GUEST_HDRLEN, VIRTIO_NET_F_DEVICE_STATS
7076
7077 static unsigned int features[] = {
7078 VIRTNET_FEATURES,
7079 };
7080
7081 static unsigned int features_legacy[] = {
7082 VIRTNET_FEATURES,
7083 VIRTIO_NET_F_GSO,
7084 VIRTIO_F_ANY_LAYOUT,
7085 };
7086
7087 static struct virtio_driver virtio_net_driver = {
7088 .feature_table = features,
7089 .feature_table_size = ARRAY_SIZE(features),
7090 .feature_table_legacy = features_legacy,
7091 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
7092 .driver.name = KBUILD_MODNAME,
7093 .id_table = id_table,
7094 .validate = virtnet_validate,
7095 .probe = virtnet_probe,
7096 .remove = virtnet_remove,
7097 .config_changed = virtnet_config_changed,
7098 #ifdef CONFIG_PM_SLEEP
7099 .freeze = virtnet_freeze,
7100 .restore = virtnet_restore,
7101 #endif
7102 };
7103
7104 static __init int virtio_net_driver_init(void)
7105 {
7106 int ret;
7107
7108 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
7109 virtnet_cpu_online,
7110 virtnet_cpu_down_prep);
7111 if (ret < 0)
7112 goto out;
7113 virtionet_online = ret;
7114 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
7115 NULL, virtnet_cpu_dead);
7116 if (ret)
7117 goto err_dead;
7118 ret = register_virtio_driver(&virtio_net_driver);
7119 if (ret)
7120 goto err_virtio;
7121 return 0;
7122 err_virtio:
7123 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
7124 err_dead:
7125 cpuhp_remove_multi_state(virtionet_online);
7126 out:
7127 return ret;
7128 }
7129 module_init(virtio_net_driver_init);
7130
7131 static __exit void virtio_net_driver_exit(void)
7132 {
7133 unregister_virtio_driver(&virtio_net_driver);
7134 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
7135 cpuhp_remove_multi_state(virtionet_online);
7136 }
7137 module_exit(virtio_net_driver_exit);
7138
7139 MODULE_DEVICE_TABLE(virtio, id_table);
7140 MODULE_DESCRIPTION("Virtio network driver");
7141 MODULE_LICENSE("GPL");
Linux Kernel