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udl-kms: avoid prefetch
[linux/fpc-iii.git] / drivers / net / hyperv / netvsc_drv.c
blobdd1d6e115145d4c14fb25d1883d1e42614e211a9
1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authors:
17 * Haiyang Zhang <haiyangz@microsoft.com>
18 * Hank Janssen <hjanssen@microsoft.com>
19 */
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/init.h>
23 #include <linux/atomic.h>
24 #include <linux/module.h>
25 #include <linux/highmem.h>
26 #include <linux/device.h>
27 #include <linux/io.h>
28 #include <linux/delay.h>
29 #include <linux/netdevice.h>
30 #include <linux/inetdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/skbuff.h>
33 #include <linux/if_vlan.h>
34 #include <linux/in.h>
35 #include <linux/slab.h>
36 #include <linux/rtnetlink.h>
37 #include <linux/netpoll.h>
38
39 #include <net/arp.h>
40 #include <net/route.h>
41 #include <net/sock.h>
42 #include <net/pkt_sched.h>
43 #include <net/checksum.h>
44 #include <net/ip6_checksum.h>
45
46 #include "hyperv_net.h"
47
48 #define RING_SIZE_MIN 64
49 #define RETRY_US_LO 5000
50 #define RETRY_US_HI 10000
51 #define RETRY_MAX 2000 /* >10 sec */
52
53 #define LINKCHANGE_INT (2 * HZ)
54 #define VF_TAKEOVER_INT (HZ / 10)
55
56 static unsigned int ring_size __ro_after_init = 128;
57 module_param(ring_size, uint, 0444);
58 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
59 unsigned int netvsc_ring_bytes __ro_after_init;
60
61 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
62 NETIF_MSG_LINK | NETIF_MSG_IFUP |
63 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
64 NETIF_MSG_TX_ERR;
65
66 static int debug = -1;
67 module_param(debug, int, 0444);
68 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
69
70 static LIST_HEAD(netvsc_dev_list);
71
72 static void netvsc_change_rx_flags(struct net_device *net, int change)
73 {
74 struct net_device_context *ndev_ctx = netdev_priv(net);
75 struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
76 int inc;
77
78 if (!vf_netdev)
79 return;
80
81 if (change & IFF_PROMISC) {
82 inc = (net->flags & IFF_PROMISC) ? 1 : -1;
83 dev_set_promiscuity(vf_netdev, inc);
84 }
85
86 if (change & IFF_ALLMULTI) {
87 inc = (net->flags & IFF_ALLMULTI) ? 1 : -1;
88 dev_set_allmulti(vf_netdev, inc);
89 }
90 }
91
92 static void netvsc_set_rx_mode(struct net_device *net)
93 {
94 struct net_device_context *ndev_ctx = netdev_priv(net);
95 struct net_device *vf_netdev;
96 struct netvsc_device *nvdev;
97
98 rcu_read_lock();
99 vf_netdev = rcu_dereference(ndev_ctx->vf_netdev);
100 if (vf_netdev) {
101 dev_uc_sync(vf_netdev, net);
102 dev_mc_sync(vf_netdev, net);
103 }
104
105 nvdev = rcu_dereference(ndev_ctx->nvdev);
106 if (nvdev)
107 rndis_filter_update(nvdev);
108 rcu_read_unlock();
109 }
110
111 static int netvsc_open(struct net_device *net)
112 {
113 struct net_device_context *ndev_ctx = netdev_priv(net);
114 struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
115 struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);
116 struct rndis_device *rdev;
117 int ret = 0;
118
119 netif_carrier_off(net);
120
121 /* Open up the device */
122 ret = rndis_filter_open(nvdev);
123 if (ret != 0) {
124 netdev_err(net, "unable to open device (ret %d).\n", ret);
125 return ret;
126 }
127
128 rdev = nvdev->extension;
129 if (!rdev->link_state) {
130 netif_carrier_on(net);
131 netif_tx_wake_all_queues(net);
132 }
133
134 if (vf_netdev) {
135 /* Setting synthetic device up transparently sets
136 * slave as up. If open fails, then slave will be
137 * still be offline (and not used).
138 */
139 ret = dev_open(vf_netdev);
140 if (ret)
141 netdev_warn(net,
142 "unable to open slave: %s: %d\n",
143 vf_netdev->name, ret);
144 }
145 return 0;
146 }
147
148 static int netvsc_wait_until_empty(struct netvsc_device *nvdev)
149 {
150 unsigned int retry = 0;
151 int i;
152
153 /* Ensure pending bytes in ring are read */
154 for (;;) {
155 u32 aread = 0;
156
157 for (i = 0; i < nvdev->num_chn; i++) {
158 struct vmbus_channel *chn
159 = nvdev->chan_table[i].channel;
160
161 if (!chn)
162 continue;
163
164 /* make sure receive not running now */
165 napi_synchronize(&nvdev->chan_table[i].napi);
166
167 aread = hv_get_bytes_to_read(&chn->inbound);
168 if (aread)
169 break;
170
171 aread = hv_get_bytes_to_read(&chn->outbound);
172 if (aread)
173 break;
174 }
175
176 if (aread == 0)
177 return 0;
178
179 if (++retry > RETRY_MAX)
180 return -ETIMEDOUT;
181
182 usleep_range(RETRY_US_LO, RETRY_US_HI);
183 }
184 }
185
186 static int netvsc_close(struct net_device *net)
187 {
188 struct net_device_context *net_device_ctx = netdev_priv(net);
189 struct net_device *vf_netdev
190 = rtnl_dereference(net_device_ctx->vf_netdev);
191 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
192 int ret;
193
194 netif_tx_disable(net);
195
196 /* No need to close rndis filter if it is removed already */
197 if (!nvdev)
198 return 0;
199
200 ret = rndis_filter_close(nvdev);
201 if (ret != 0) {
202 netdev_err(net, "unable to close device (ret %d).\n", ret);
203 return ret;
204 }
205
206 ret = netvsc_wait_until_empty(nvdev);
207 if (ret)
208 netdev_err(net, "Ring buffer not empty after closing rndis\n");
209
210 if (vf_netdev)
211 dev_close(vf_netdev);
212
213 return ret;
214 }
215
216 static inline void *init_ppi_data(struct rndis_message *msg,
217 u32 ppi_size, u32 pkt_type)
218 {
219 struct rndis_packet *rndis_pkt = &msg->msg.pkt;
220 struct rndis_per_packet_info *ppi;
221
222 rndis_pkt->data_offset += ppi_size;
223 ppi = (void *)rndis_pkt + rndis_pkt->per_pkt_info_offset
224 + rndis_pkt->per_pkt_info_len;
225
226 ppi->size = ppi_size;
227 ppi->type = pkt_type;
228 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
229
230 rndis_pkt->per_pkt_info_len += ppi_size;
231
232 return ppi + 1;
233 }
234
235 /* Azure hosts don't support non-TCP port numbers in hashing for fragmented
236 * packets. We can use ethtool to change UDP hash level when necessary.
237 */
238 static inline u32 netvsc_get_hash(
239 struct sk_buff *skb,
240 const struct net_device_context *ndc)
241 {
242 struct flow_keys flow;
243 u32 hash, pkt_proto = 0;
244 static u32 hashrnd __read_mostly;
245
246 net_get_random_once(&hashrnd, sizeof(hashrnd));
247
248 if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
249 return 0;
250
251 switch (flow.basic.ip_proto) {
252 case IPPROTO_TCP:
253 if (flow.basic.n_proto == htons(ETH_P_IP))
254 pkt_proto = HV_TCP4_L4HASH;
255 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
256 pkt_proto = HV_TCP6_L4HASH;
257
258 break;
259
260 case IPPROTO_UDP:
261 if (flow.basic.n_proto == htons(ETH_P_IP))
262 pkt_proto = HV_UDP4_L4HASH;
263 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
264 pkt_proto = HV_UDP6_L4HASH;
265
266 break;
267 }
268
269 if (pkt_proto & ndc->l4_hash) {
270 return skb_get_hash(skb);
271 } else {
272 if (flow.basic.n_proto == htons(ETH_P_IP))
273 hash = jhash2((u32 *)&flow.addrs.v4addrs, 2, hashrnd);
274 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
275 hash = jhash2((u32 *)&flow.addrs.v6addrs, 8, hashrnd);
276 else
277 hash = 0;
278
279 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
280 }
281
282 return hash;
283 }
284
285 static inline int netvsc_get_tx_queue(struct net_device *ndev,
286 struct sk_buff *skb, int old_idx)
287 {
288 const struct net_device_context *ndc = netdev_priv(ndev);
289 struct sock *sk = skb->sk;
290 int q_idx;
291
292 q_idx = ndc->tx_table[netvsc_get_hash(skb, ndc) &
293 (VRSS_SEND_TAB_SIZE - 1)];
294
295 /* If queue index changed record the new value */
296 if (q_idx != old_idx &&
297 sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
298 sk_tx_queue_set(sk, q_idx);
299
300 return q_idx;
301 }
302
303 /*
304 * Select queue for transmit.
305 *
306 * If a valid queue has already been assigned, then use that.
307 * Otherwise compute tx queue based on hash and the send table.
308 *
309 * This is basically similar to default (__netdev_pick_tx) with the added step
310 * of using the host send_table when no other queue has been assigned.
311 *
312 * TODO support XPS - but get_xps_queue not exported
313 */
314 static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)
315 {
316 int q_idx = sk_tx_queue_get(skb->sk);
317
318 if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {
319 /* If forwarding a packet, we use the recorded queue when
320 * available for better cache locality.
321 */
322 if (skb_rx_queue_recorded(skb))
323 q_idx = skb_get_rx_queue(skb);
324 else
325 q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);
326 }
327
328 return q_idx;
329 }
330
331 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
332 void *accel_priv,
333 select_queue_fallback_t fallback)
334 {
335 struct net_device_context *ndc = netdev_priv(ndev);
336 struct net_device *vf_netdev;
337 u16 txq;
338
339 rcu_read_lock();
340 vf_netdev = rcu_dereference(ndc->vf_netdev);
341 if (vf_netdev) {
342 const struct net_device_ops *vf_ops = vf_netdev->netdev_ops;
343
344 if (vf_ops->ndo_select_queue)
345 txq = vf_ops->ndo_select_queue(vf_netdev, skb,
346 accel_priv, fallback);
347 else
348 txq = fallback(vf_netdev, skb);
349
350 /* Record the queue selected by VF so that it can be
351 * used for common case where VF has more queues than
352 * the synthetic device.
353 */
354 qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq;
355 } else {
356 txq = netvsc_pick_tx(ndev, skb);
357 }
358 rcu_read_unlock();
359
360 while (unlikely(txq >= ndev->real_num_tx_queues))
361 txq -= ndev->real_num_tx_queues;
362
363 return txq;
364 }
365
366 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
367 struct hv_page_buffer *pb)
368 {
369 int j = 0;
370
371 /* Deal with compund pages by ignoring unused part
372 * of the page.
373 */
374 page += (offset >> PAGE_SHIFT);
375 offset &= ~PAGE_MASK;
376
377 while (len > 0) {
378 unsigned long bytes;
379
380 bytes = PAGE_SIZE - offset;
381 if (bytes > len)
382 bytes = len;
383 pb[j].pfn = page_to_pfn(page);
384 pb[j].offset = offset;
385 pb[j].len = bytes;
386
387 offset += bytes;
388 len -= bytes;
389
390 if (offset == PAGE_SIZE && len) {
391 page++;
392 offset = 0;
393 j++;
394 }
395 }
396
397 return j + 1;
398 }
399
400 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
401 struct hv_netvsc_packet *packet,
402 struct hv_page_buffer *pb)
403 {
404 u32 slots_used = 0;
405 char *data = skb->data;
406 int frags = skb_shinfo(skb)->nr_frags;
407 int i;
408
409 /* The packet is laid out thus:
410 * 1. hdr: RNDIS header and PPI
411 * 2. skb linear data
412 * 3. skb fragment data
413 */
414 slots_used += fill_pg_buf(virt_to_page(hdr),
415 offset_in_page(hdr),
416 len, &pb[slots_used]);
417
418 packet->rmsg_size = len;
419 packet->rmsg_pgcnt = slots_used;
420
421 slots_used += fill_pg_buf(virt_to_page(data),
422 offset_in_page(data),
423 skb_headlen(skb), &pb[slots_used]);
424
425 for (i = 0; i < frags; i++) {
426 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
427
428 slots_used += fill_pg_buf(skb_frag_page(frag),
429 frag->page_offset,
430 skb_frag_size(frag), &pb[slots_used]);
431 }
432 return slots_used;
433 }
434
435 static int count_skb_frag_slots(struct sk_buff *skb)
436 {
437 int i, frags = skb_shinfo(skb)->nr_frags;
438 int pages = 0;
439
440 for (i = 0; i < frags; i++) {
441 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
442 unsigned long size = skb_frag_size(frag);
443 unsigned long offset = frag->page_offset;
444
445 /* Skip unused frames from start of page */
446 offset &= ~PAGE_MASK;
447 pages += PFN_UP(offset + size);
448 }
449 return pages;
450 }
451
452 static int netvsc_get_slots(struct sk_buff *skb)
453 {
454 char *data = skb->data;
455 unsigned int offset = offset_in_page(data);
456 unsigned int len = skb_headlen(skb);
457 int slots;
458 int frag_slots;
459
460 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
461 frag_slots = count_skb_frag_slots(skb);
462 return slots + frag_slots;
463 }
464
465 static u32 net_checksum_info(struct sk_buff *skb)
466 {
467 if (skb->protocol == htons(ETH_P_IP)) {
468 struct iphdr *ip = ip_hdr(skb);
469
470 if (ip->protocol == IPPROTO_TCP)
471 return TRANSPORT_INFO_IPV4_TCP;
472 else if (ip->protocol == IPPROTO_UDP)
473 return TRANSPORT_INFO_IPV4_UDP;
474 } else {
475 struct ipv6hdr *ip6 = ipv6_hdr(skb);
476
477 if (ip6->nexthdr == IPPROTO_TCP)
478 return TRANSPORT_INFO_IPV6_TCP;
479 else if (ip6->nexthdr == IPPROTO_UDP)
480 return TRANSPORT_INFO_IPV6_UDP;
481 }
482
483 return TRANSPORT_INFO_NOT_IP;
484 }
485
486 /* Send skb on the slave VF device. */
487 static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
488 struct sk_buff *skb)
489 {
490 struct net_device_context *ndev_ctx = netdev_priv(net);
491 unsigned int len = skb->len;
492 int rc;
493
494 skb->dev = vf_netdev;
495 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
496
497 rc = dev_queue_xmit(skb);
498 if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {
499 struct netvsc_vf_pcpu_stats *pcpu_stats
500 = this_cpu_ptr(ndev_ctx->vf_stats);
501
502 u64_stats_update_begin(&pcpu_stats->syncp);
503 pcpu_stats->tx_packets++;
504 pcpu_stats->tx_bytes += len;
505 u64_stats_update_end(&pcpu_stats->syncp);
506 } else {
507 this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);
508 }
509
510 return rc;
511 }
512
513 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
514 {
515 struct net_device_context *net_device_ctx = netdev_priv(net);
516 struct hv_netvsc_packet *packet = NULL;
517 int ret;
518 unsigned int num_data_pgs;
519 struct rndis_message *rndis_msg;
520 struct net_device *vf_netdev;
521 u32 rndis_msg_size;
522 u32 hash;
523 struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
524
525 /* if VF is present and up then redirect packets
526 * already called with rcu_read_lock_bh
527 */
528 vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
529 if (vf_netdev && netif_running(vf_netdev) &&
530 !netpoll_tx_running(net))
531 return netvsc_vf_xmit(net, vf_netdev, skb);
532
533 /* We will atmost need two pages to describe the rndis
534 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
535 * of pages in a single packet. If skb is scattered around
536 * more pages we try linearizing it.
537 */
538
539 num_data_pgs = netvsc_get_slots(skb) + 2;
540
541 if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
542 ++net_device_ctx->eth_stats.tx_scattered;
543
544 if (skb_linearize(skb))
545 goto no_memory;
546
547 num_data_pgs = netvsc_get_slots(skb) + 2;
548 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
549 ++net_device_ctx->eth_stats.tx_too_big;
550 goto drop;
551 }
552 }
553
554 /*
555 * Place the rndis header in the skb head room and
556 * the skb->cb will be used for hv_netvsc_packet
557 * structure.
558 */
559 ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
560 if (ret)
561 goto no_memory;
562
563 /* Use the skb control buffer for building up the packet */
564 BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
565 FIELD_SIZEOF(struct sk_buff, cb));
566 packet = (struct hv_netvsc_packet *)skb->cb;
567
568 packet->q_idx = skb_get_queue_mapping(skb);
569
570 packet->total_data_buflen = skb->len;
571 packet->total_bytes = skb->len;
572 packet->total_packets = 1;
573
574 rndis_msg = (struct rndis_message *)skb->head;
575
576 /* Add the rndis header */
577 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
578 rndis_msg->msg_len = packet->total_data_buflen;
579
580 rndis_msg->msg.pkt = (struct rndis_packet) {
581 .data_offset = sizeof(struct rndis_packet),
582 .data_len = packet->total_data_buflen,
583 .per_pkt_info_offset = sizeof(struct rndis_packet),
584 };
585
586 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
587
588 hash = skb_get_hash_raw(skb);
589 if (hash != 0 && net->real_num_tx_queues > 1) {
590 u32 *hash_info;
591
592 rndis_msg_size += NDIS_HASH_PPI_SIZE;
593 hash_info = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
594 NBL_HASH_VALUE);
595 *hash_info = hash;
596 }
597
598 if (skb_vlan_tag_present(skb)) {
599 struct ndis_pkt_8021q_info *vlan;
600
601 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
602 vlan = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
603 IEEE_8021Q_INFO);
604
605 vlan->value = 0;
606 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
607 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
608 VLAN_PRIO_SHIFT;
609 }
610
611 if (skb_is_gso(skb)) {
612 struct ndis_tcp_lso_info *lso_info;
613
614 rndis_msg_size += NDIS_LSO_PPI_SIZE;
615 lso_info = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
616 TCP_LARGESEND_PKTINFO);
617
618 lso_info->value = 0;
619 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
620 if (skb->protocol == htons(ETH_P_IP)) {
621 lso_info->lso_v2_transmit.ip_version =
622 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
623 ip_hdr(skb)->tot_len = 0;
624 ip_hdr(skb)->check = 0;
625 tcp_hdr(skb)->check =
626 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
627 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
628 } else {
629 lso_info->lso_v2_transmit.ip_version =
630 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
631 ipv6_hdr(skb)->payload_len = 0;
632 tcp_hdr(skb)->check =
633 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
634 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
635 }
636 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
637 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
638 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
639 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
640 struct ndis_tcp_ip_checksum_info *csum_info;
641
642 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
643 csum_info = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
644 TCPIP_CHKSUM_PKTINFO);
645
646 csum_info->value = 0;
647 csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
648
649 if (skb->protocol == htons(ETH_P_IP)) {
650 csum_info->transmit.is_ipv4 = 1;
651
652 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
653 csum_info->transmit.tcp_checksum = 1;
654 else
655 csum_info->transmit.udp_checksum = 1;
656 } else {
657 csum_info->transmit.is_ipv6 = 1;
658
659 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
660 csum_info->transmit.tcp_checksum = 1;
661 else
662 csum_info->transmit.udp_checksum = 1;
663 }
664 } else {
665 /* Can't do offload of this type of checksum */
666 if (skb_checksum_help(skb))
667 goto drop;
668 }
669 }
670
671 /* Start filling in the page buffers with the rndis hdr */
672 rndis_msg->msg_len += rndis_msg_size;
673 packet->total_data_buflen = rndis_msg->msg_len;
674 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
675 skb, packet, pb);
676
677 /* timestamp packet in software */
678 skb_tx_timestamp(skb);
679
680 ret = netvsc_send(net, packet, rndis_msg, pb, skb);
681 if (likely(ret == 0))
682 return NETDEV_TX_OK;
683
684 if (ret == -EAGAIN) {
685 ++net_device_ctx->eth_stats.tx_busy;
686 return NETDEV_TX_BUSY;
687 }
688
689 if (ret == -ENOSPC)
690 ++net_device_ctx->eth_stats.tx_no_space;
691
692 drop:
693 dev_kfree_skb_any(skb);
694 net->stats.tx_dropped++;
695
696 return NETDEV_TX_OK;
697
698 no_memory:
699 ++net_device_ctx->eth_stats.tx_no_memory;
700 goto drop;
701 }
702
703 /*
704 * netvsc_linkstatus_callback - Link up/down notification
705 */
706 void netvsc_linkstatus_callback(struct net_device *net,
707 struct rndis_message *resp)
708 {
709 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
710 struct net_device_context *ndev_ctx = netdev_priv(net);
711 struct netvsc_reconfig *event;
712 unsigned long flags;
713
714 /* Update the physical link speed when changing to another vSwitch */
715 if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
716 u32 speed;
717
718 speed = *(u32 *)((void *)indicate
719 + indicate->status_buf_offset) / 10000;
720 ndev_ctx->speed = speed;
721 return;
722 }
723
724 /* Handle these link change statuses below */
725 if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
726 indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
727 indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
728 return;
729
730 if (net->reg_state != NETREG_REGISTERED)
731 return;
732
733 event = kzalloc(sizeof(*event), GFP_ATOMIC);
734 if (!event)
735 return;
736 event->event = indicate->status;
737
738 spin_lock_irqsave(&ndev_ctx->lock, flags);
739 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
740 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
741
742 schedule_delayed_work(&ndev_ctx->dwork, 0);
743 }
744
745 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
746 struct napi_struct *napi,
747 const struct ndis_tcp_ip_checksum_info *csum_info,
748 const struct ndis_pkt_8021q_info *vlan,
749 void *data, u32 buflen)
750 {
751 struct sk_buff *skb;
752
753 skb = napi_alloc_skb(napi, buflen);
754 if (!skb)
755 return skb;
756
757 /*
758 * Copy to skb. This copy is needed here since the memory pointed by
759 * hv_netvsc_packet cannot be deallocated
760 */
761 skb_put_data(skb, data, buflen);
762
763 skb->protocol = eth_type_trans(skb, net);
764
765 /* skb is already created with CHECKSUM_NONE */
766 skb_checksum_none_assert(skb);
767
768 /*
769 * In Linux, the IP checksum is always checked.
770 * Do L4 checksum offload if enabled and present.
771 */
772 if (csum_info && (net->features & NETIF_F_RXCSUM)) {
773 if (csum_info->receive.tcp_checksum_succeeded ||
774 csum_info->receive.udp_checksum_succeeded)
775 skb->ip_summed = CHECKSUM_UNNECESSARY;
776 }
777
778 if (vlan) {
779 u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
780
781 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
782 vlan_tci);
783 }
784
785 return skb;
786 }
787
788 /*
789 * netvsc_recv_callback - Callback when we receive a packet from the
790 * "wire" on the specified device.
791 */
792 int netvsc_recv_callback(struct net_device *net,
793 struct netvsc_device *net_device,
794 struct vmbus_channel *channel,
795 void *data, u32 len,
796 const struct ndis_tcp_ip_checksum_info *csum_info,
797 const struct ndis_pkt_8021q_info *vlan)
798 {
799 struct net_device_context *net_device_ctx = netdev_priv(net);
800 u16 q_idx = channel->offermsg.offer.sub_channel_index;
801 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
802 struct sk_buff *skb;
803 struct netvsc_stats *rx_stats;
804
805 if (net->reg_state != NETREG_REGISTERED)
806 return NVSP_STAT_FAIL;
807
808 /* Allocate a skb - TODO direct I/O to pages? */
809 skb = netvsc_alloc_recv_skb(net, &nvchan->napi,
810 csum_info, vlan, data, len);
811 if (unlikely(!skb)) {
812 ++net_device_ctx->eth_stats.rx_no_memory;
813 rcu_read_unlock();
814 return NVSP_STAT_FAIL;
815 }
816
817 skb_record_rx_queue(skb, q_idx);
818
819 /*
820 * Even if injecting the packet, record the statistics
821 * on the synthetic device because modifying the VF device
822 * statistics will not work correctly.
823 */
824 rx_stats = &nvchan->rx_stats;
825 u64_stats_update_begin(&rx_stats->syncp);
826 rx_stats->packets++;
827 rx_stats->bytes += len;
828
829 if (skb->pkt_type == PACKET_BROADCAST)
830 ++rx_stats->broadcast;
831 else if (skb->pkt_type == PACKET_MULTICAST)
832 ++rx_stats->multicast;
833 u64_stats_update_end(&rx_stats->syncp);
834
835 napi_gro_receive(&nvchan->napi, skb);
836 return NVSP_STAT_SUCCESS;
837 }
838
839 static void netvsc_get_drvinfo(struct net_device *net,
840 struct ethtool_drvinfo *info)
841 {
842 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
843 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
844 }
845
846 static void netvsc_get_channels(struct net_device *net,
847 struct ethtool_channels *channel)
848 {
849 struct net_device_context *net_device_ctx = netdev_priv(net);
850 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
851
852 if (nvdev) {
853 channel->max_combined = nvdev->max_chn;
854 channel->combined_count = nvdev->num_chn;
855 }
856 }
857
858 static int netvsc_detach(struct net_device *ndev,
859 struct netvsc_device *nvdev)
860 {
861 struct net_device_context *ndev_ctx = netdev_priv(ndev);
862 struct hv_device *hdev = ndev_ctx->device_ctx;
863 int ret;
864
865 /* Don't try continuing to try and setup sub channels */
866 if (cancel_work_sync(&nvdev->subchan_work))
867 nvdev->num_chn = 1;
868
869 /* If device was up (receiving) then shutdown */
870 if (netif_running(ndev)) {
871 netif_tx_disable(ndev);
872
873 ret = rndis_filter_close(nvdev);
874 if (ret) {
875 netdev_err(ndev,
876 "unable to close device (ret %d).\n", ret);
877 return ret;
878 }
879
880 ret = netvsc_wait_until_empty(nvdev);
881 if (ret) {
882 netdev_err(ndev,
883 "Ring buffer not empty after closing rndis\n");
884 return ret;
885 }
886 }
887
888 netif_device_detach(ndev);
889
890 rndis_filter_device_remove(hdev, nvdev);
891
892 return 0;
893 }
894
895 static int netvsc_attach(struct net_device *ndev,
896 struct netvsc_device_info *dev_info)
897 {
898 struct net_device_context *ndev_ctx = netdev_priv(ndev);
899 struct hv_device *hdev = ndev_ctx->device_ctx;
900 struct netvsc_device *nvdev;
901 struct rndis_device *rdev;
902 int ret;
903
904 nvdev = rndis_filter_device_add(hdev, dev_info);
905 if (IS_ERR(nvdev))
906 return PTR_ERR(nvdev);
907
908 if (nvdev->num_chn > 1) {
909 ret = rndis_set_subchannel(ndev, nvdev);
910
911 /* if unavailable, just proceed with one queue */
912 if (ret) {
913 nvdev->max_chn = 1;
914 nvdev->num_chn = 1;
915 }
916 }
917
918 /* In any case device is now ready */
919 netif_device_attach(ndev);
920
921 /* Note: enable and attach happen when sub-channels setup */
922 netif_carrier_off(ndev);
923
924 if (netif_running(ndev)) {
925 ret = rndis_filter_open(nvdev);
926 if (ret)
927 return ret;
928
929 rdev = nvdev->extension;
930 if (!rdev->link_state)
931 netif_carrier_on(ndev);
932 }
933
934 return 0;
935 }
936
937 static int netvsc_set_channels(struct net_device *net,
938 struct ethtool_channels *channels)
939 {
940 struct net_device_context *net_device_ctx = netdev_priv(net);
941 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
942 unsigned int orig, count = channels->combined_count;
943 struct netvsc_device_info device_info;
944 int ret;
945
946 /* We do not support separate count for rx, tx, or other */
947 if (count == 0 ||
948 channels->rx_count || channels->tx_count || channels->other_count)
949 return -EINVAL;
950
951 if (!nvdev || nvdev->destroy)
952 return -ENODEV;
953
954 if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
955 return -EINVAL;
956
957 if (count > nvdev->max_chn)
958 return -EINVAL;
959
960 orig = nvdev->num_chn;
961
962 memset(&device_info, 0, sizeof(device_info));
963 device_info.num_chn = count;
964 device_info.send_sections = nvdev->send_section_cnt;
965 device_info.send_section_size = nvdev->send_section_size;
966 device_info.recv_sections = nvdev->recv_section_cnt;
967 device_info.recv_section_size = nvdev->recv_section_size;
968
969 ret = netvsc_detach(net, nvdev);
970 if (ret)
971 return ret;
972
973 ret = netvsc_attach(net, &device_info);
974 if (ret) {
975 device_info.num_chn = orig;
976 if (netvsc_attach(net, &device_info))
977 netdev_err(net, "restoring channel setting failed\n");
978 }
979
980 return ret;
981 }
982
983 static bool
984 netvsc_validate_ethtool_ss_cmd(const struct ethtool_link_ksettings *cmd)
985 {
986 struct ethtool_link_ksettings diff1 = *cmd;
987 struct ethtool_link_ksettings diff2 = {};
988
989 diff1.base.speed = 0;
990 diff1.base.duplex = 0;
991 /* advertising and cmd are usually set */
992 ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
993 diff1.base.cmd = 0;
994 /* We set port to PORT_OTHER */
995 diff2.base.port = PORT_OTHER;
996
997 return !memcmp(&diff1, &diff2, sizeof(diff1));
998 }
999
1000 static void netvsc_init_settings(struct net_device *dev)
1001 {
1002 struct net_device_context *ndc = netdev_priv(dev);
1003
1004 ndc->l4_hash = HV_DEFAULT_L4HASH;
1005
1006 ndc->speed = SPEED_UNKNOWN;
1007 ndc->duplex = DUPLEX_FULL;
1008 }
1009
1010 static int netvsc_get_link_ksettings(struct net_device *dev,
1011 struct ethtool_link_ksettings *cmd)
1012 {
1013 struct net_device_context *ndc = netdev_priv(dev);
1014
1015 cmd->base.speed = ndc->speed;
1016 cmd->base.duplex = ndc->duplex;
1017 cmd->base.port = PORT_OTHER;
1018
1019 return 0;
1020 }
1021
1022 static int netvsc_set_link_ksettings(struct net_device *dev,
1023 const struct ethtool_link_ksettings *cmd)
1024 {
1025 struct net_device_context *ndc = netdev_priv(dev);
1026 u32 speed;
1027
1028 speed = cmd->base.speed;
1029 if (!ethtool_validate_speed(speed) ||
1030 !ethtool_validate_duplex(cmd->base.duplex) ||
1031 !netvsc_validate_ethtool_ss_cmd(cmd))
1032 return -EINVAL;
1033
1034 ndc->speed = speed;
1035 ndc->duplex = cmd->base.duplex;
1036
1037 return 0;
1038 }
1039
1040 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
1041 {
1042 struct net_device_context *ndevctx = netdev_priv(ndev);
1043 struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
1044 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1045 int orig_mtu = ndev->mtu;
1046 struct netvsc_device_info device_info;
1047 int ret = 0;
1048
1049 if (!nvdev || nvdev->destroy)
1050 return -ENODEV;
1051
1052 /* Change MTU of underlying VF netdev first. */
1053 if (vf_netdev) {
1054 ret = dev_set_mtu(vf_netdev, mtu);
1055 if (ret)
1056 return ret;
1057 }
1058
1059 memset(&device_info, 0, sizeof(device_info));
1060 device_info.num_chn = nvdev->num_chn;
1061 device_info.send_sections = nvdev->send_section_cnt;
1062 device_info.send_section_size = nvdev->send_section_size;
1063 device_info.recv_sections = nvdev->recv_section_cnt;
1064 device_info.recv_section_size = nvdev->recv_section_size;
1065
1066 ret = netvsc_detach(ndev, nvdev);
1067 if (ret)
1068 goto rollback_vf;
1069
1070 ndev->mtu = mtu;
1071
1072 ret = netvsc_attach(ndev, &device_info);
1073 if (ret)
1074 goto rollback;
1075
1076 return 0;
1077
1078 rollback:
1079 /* Attempt rollback to original MTU */
1080 ndev->mtu = orig_mtu;
1081
1082 if (netvsc_attach(ndev, &device_info))
1083 netdev_err(ndev, "restoring mtu failed\n");
1084 rollback_vf:
1085 if (vf_netdev)
1086 dev_set_mtu(vf_netdev, orig_mtu);
1087
1088 return ret;
1089 }
1090
1091 static void netvsc_get_vf_stats(struct net_device *net,
1092 struct netvsc_vf_pcpu_stats *tot)
1093 {
1094 struct net_device_context *ndev_ctx = netdev_priv(net);
1095 int i;
1096
1097 memset(tot, 0, sizeof(*tot));
1098
1099 for_each_possible_cpu(i) {
1100 const struct netvsc_vf_pcpu_stats *stats
1101 = per_cpu_ptr(ndev_ctx->vf_stats, i);
1102 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1103 unsigned int start;
1104
1105 do {
1106 start = u64_stats_fetch_begin_irq(&stats->syncp);
1107 rx_packets = stats->rx_packets;
1108 tx_packets = stats->tx_packets;
1109 rx_bytes = stats->rx_bytes;
1110 tx_bytes = stats->tx_bytes;
1111 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1112
1113 tot->rx_packets += rx_packets;
1114 tot->tx_packets += tx_packets;
1115 tot->rx_bytes += rx_bytes;
1116 tot->tx_bytes += tx_bytes;
1117 tot->tx_dropped += stats->tx_dropped;
1118 }
1119 }
1120
1121 static void netvsc_get_stats64(struct net_device *net,
1122 struct rtnl_link_stats64 *t)
1123 {
1124 struct net_device_context *ndev_ctx = netdev_priv(net);
1125 struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev);
1126 struct netvsc_vf_pcpu_stats vf_tot;
1127 int i;
1128
1129 if (!nvdev)
1130 return;
1131
1132 netdev_stats_to_stats64(t, &net->stats);
1133
1134 netvsc_get_vf_stats(net, &vf_tot);
1135 t->rx_packets += vf_tot.rx_packets;
1136 t->tx_packets += vf_tot.tx_packets;
1137 t->rx_bytes += vf_tot.rx_bytes;
1138 t->tx_bytes += vf_tot.tx_bytes;
1139 t->tx_dropped += vf_tot.tx_dropped;
1140
1141 for (i = 0; i < nvdev->num_chn; i++) {
1142 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1143 const struct netvsc_stats *stats;
1144 u64 packets, bytes, multicast;
1145 unsigned int start;
1146
1147 stats = &nvchan->tx_stats;
1148 do {
1149 start = u64_stats_fetch_begin_irq(&stats->syncp);
1150 packets = stats->packets;
1151 bytes = stats->bytes;
1152 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1153
1154 t->tx_bytes += bytes;
1155 t->tx_packets += packets;
1156
1157 stats = &nvchan->rx_stats;
1158 do {
1159 start = u64_stats_fetch_begin_irq(&stats->syncp);
1160 packets = stats->packets;
1161 bytes = stats->bytes;
1162 multicast = stats->multicast + stats->broadcast;
1163 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1164
1165 t->rx_bytes += bytes;
1166 t->rx_packets += packets;
1167 t->multicast += multicast;
1168 }
1169 }
1170
1171 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
1172 {
1173 struct net_device_context *ndc = netdev_priv(ndev);
1174 struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
1175 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1176 struct sockaddr *addr = p;
1177 int err;
1178
1179 err = eth_prepare_mac_addr_change(ndev, p);
1180 if (err)
1181 return err;
1182
1183 if (!nvdev)
1184 return -ENODEV;
1185
1186 if (vf_netdev) {
1187 err = dev_set_mac_address(vf_netdev, addr);
1188 if (err)
1189 return err;
1190 }
1191
1192 err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
1193 if (!err) {
1194 eth_commit_mac_addr_change(ndev, p);
1195 } else if (vf_netdev) {
1196 /* rollback change on VF */
1197 memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
1198 dev_set_mac_address(vf_netdev, addr);
1199 }
1200
1201 return err;
1202 }
1203
1204 static const struct {
1205 char name[ETH_GSTRING_LEN];
1206 u16 offset;
1207 } netvsc_stats[] = {
1208 { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
1209 { "tx_no_memory", offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
1210 { "tx_no_space", offsetof(struct netvsc_ethtool_stats, tx_no_space) },
1211 { "tx_too_big", offsetof(struct netvsc_ethtool_stats, tx_too_big) },
1212 { "tx_busy", offsetof(struct netvsc_ethtool_stats, tx_busy) },
1213 { "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },
1214 { "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },
1215 { "rx_no_memory", offsetof(struct netvsc_ethtool_stats, rx_no_memory) },
1216 { "stop_queue", offsetof(struct netvsc_ethtool_stats, stop_queue) },
1217 { "wake_queue", offsetof(struct netvsc_ethtool_stats, wake_queue) },
1218 }, vf_stats[] = {
1219 { "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },
1220 { "vf_rx_bytes", offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },
1221 { "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },
1222 { "vf_tx_bytes", offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },
1223 { "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },
1224 };
1225
1226 #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats)
1227 #define NETVSC_VF_STATS_LEN ARRAY_SIZE(vf_stats)
1228
1229 /* 4 statistics per queue (rx/tx packets/bytes) */
1230 #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4)
1231
1232 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
1233 {
1234 struct net_device_context *ndc = netdev_priv(dev);
1235 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1236
1237 if (!nvdev)
1238 return -ENODEV;
1239
1240 switch (string_set) {
1241 case ETH_SS_STATS:
1242 return NETVSC_GLOBAL_STATS_LEN
1243 + NETVSC_VF_STATS_LEN
1244 + NETVSC_QUEUE_STATS_LEN(nvdev);
1245 default:
1246 return -EINVAL;
1247 }
1248 }
1249
1250 static void netvsc_get_ethtool_stats(struct net_device *dev,
1251 struct ethtool_stats *stats, u64 *data)
1252 {
1253 struct net_device_context *ndc = netdev_priv(dev);
1254 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1255 const void *nds = &ndc->eth_stats;
1256 const struct netvsc_stats *qstats;
1257 struct netvsc_vf_pcpu_stats sum;
1258 unsigned int start;
1259 u64 packets, bytes;
1260 int i, j;
1261
1262 if (!nvdev)
1263 return;
1264
1265 for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
1266 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1267
1268 netvsc_get_vf_stats(dev, &sum);
1269 for (j = 0; j < NETVSC_VF_STATS_LEN; j++)
1270 data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);
1271
1272 for (j = 0; j < nvdev->num_chn; j++) {
1273 qstats = &nvdev->chan_table[j].tx_stats;
1274
1275 do {
1276 start = u64_stats_fetch_begin_irq(&qstats->syncp);
1277 packets = qstats->packets;
1278 bytes = qstats->bytes;
1279 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1280 data[i++] = packets;
1281 data[i++] = bytes;
1282
1283 qstats = &nvdev->chan_table[j].rx_stats;
1284 do {
1285 start = u64_stats_fetch_begin_irq(&qstats->syncp);
1286 packets = qstats->packets;
1287 bytes = qstats->bytes;
1288 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1289 data[i++] = packets;
1290 data[i++] = bytes;
1291 }
1292 }
1293
1294 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1295 {
1296 struct net_device_context *ndc = netdev_priv(dev);
1297 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1298 u8 *p = data;
1299 int i;
1300
1301 if (!nvdev)
1302 return;
1303
1304 switch (stringset) {
1305 case ETH_SS_STATS:
1306 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) {
1307 memcpy(p, netvsc_stats[i].name, ETH_GSTRING_LEN);
1308 p += ETH_GSTRING_LEN;
1309 }
1310
1311 for (i = 0; i < ARRAY_SIZE(vf_stats); i++) {
1312 memcpy(p, vf_stats[i].name, ETH_GSTRING_LEN);
1313 p += ETH_GSTRING_LEN;
1314 }
1315
1316 for (i = 0; i < nvdev->num_chn; i++) {
1317 sprintf(p, "tx_queue_%u_packets", i);
1318 p += ETH_GSTRING_LEN;
1319 sprintf(p, "tx_queue_%u_bytes", i);
1320 p += ETH_GSTRING_LEN;
1321 sprintf(p, "rx_queue_%u_packets", i);
1322 p += ETH_GSTRING_LEN;
1323 sprintf(p, "rx_queue_%u_bytes", i);
1324 p += ETH_GSTRING_LEN;
1325 }
1326
1327 break;
1328 }
1329 }
1330
1331 static int
1332 netvsc_get_rss_hash_opts(struct net_device_context *ndc,
1333 struct ethtool_rxnfc *info)
1334 {
1335 const u32 l4_flag = RXH_L4_B_0_1 | RXH_L4_B_2_3;
1336
1337 info->data = RXH_IP_SRC | RXH_IP_DST;
1338
1339 switch (info->flow_type) {
1340 case TCP_V4_FLOW:
1341 if (ndc->l4_hash & HV_TCP4_L4HASH)
1342 info->data |= l4_flag;
1343
1344 break;
1345
1346 case TCP_V6_FLOW:
1347 if (ndc->l4_hash & HV_TCP6_L4HASH)
1348 info->data |= l4_flag;
1349
1350 break;
1351
1352 case UDP_V4_FLOW:
1353 if (ndc->l4_hash & HV_UDP4_L4HASH)
1354 info->data |= l4_flag;
1355
1356 break;
1357
1358 case UDP_V6_FLOW:
1359 if (ndc->l4_hash & HV_UDP6_L4HASH)
1360 info->data |= l4_flag;
1361
1362 break;
1363
1364 case IPV4_FLOW:
1365 case IPV6_FLOW:
1366 break;
1367 default:
1368 info->data = 0;
1369 break;
1370 }
1371
1372 return 0;
1373 }
1374
1375 static int
1376 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1377 u32 *rules)
1378 {
1379 struct net_device_context *ndc = netdev_priv(dev);
1380 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1381
1382 if (!nvdev)
1383 return -ENODEV;
1384
1385 switch (info->cmd) {
1386 case ETHTOOL_GRXRINGS:
1387 info->data = nvdev->num_chn;
1388 return 0;
1389
1390 case ETHTOOL_GRXFH:
1391 return netvsc_get_rss_hash_opts(ndc, info);
1392 }
1393 return -EOPNOTSUPP;
1394 }
1395
1396 static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
1397 struct ethtool_rxnfc *info)
1398 {
1399 if (info->data == (RXH_IP_SRC | RXH_IP_DST |
1400 RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
1401 switch (info->flow_type) {
1402 case TCP_V4_FLOW:
1403 ndc->l4_hash |= HV_TCP4_L4HASH;
1404 break;
1405
1406 case TCP_V6_FLOW:
1407 ndc->l4_hash |= HV_TCP6_L4HASH;
1408 break;
1409
1410 case UDP_V4_FLOW:
1411 ndc->l4_hash |= HV_UDP4_L4HASH;
1412 break;
1413
1414 case UDP_V6_FLOW:
1415 ndc->l4_hash |= HV_UDP6_L4HASH;
1416 break;
1417
1418 default:
1419 return -EOPNOTSUPP;
1420 }
1421
1422 return 0;
1423 }
1424
1425 if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {
1426 switch (info->flow_type) {
1427 case TCP_V4_FLOW:
1428 ndc->l4_hash &= ~HV_TCP4_L4HASH;
1429 break;
1430
1431 case TCP_V6_FLOW:
1432 ndc->l4_hash &= ~HV_TCP6_L4HASH;
1433 break;
1434
1435 case UDP_V4_FLOW:
1436 ndc->l4_hash &= ~HV_UDP4_L4HASH;
1437 break;
1438
1439 case UDP_V6_FLOW:
1440 ndc->l4_hash &= ~HV_UDP6_L4HASH;
1441 break;
1442
1443 default:
1444 return -EOPNOTSUPP;
1445 }
1446
1447 return 0;
1448 }
1449
1450 return -EOPNOTSUPP;
1451 }
1452
1453 static int
1454 netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
1455 {
1456 struct net_device_context *ndc = netdev_priv(ndev);
1457
1458 if (info->cmd == ETHTOOL_SRXFH)
1459 return netvsc_set_rss_hash_opts(ndc, info);
1460
1461 return -EOPNOTSUPP;
1462 }
1463
1464 #ifdef CONFIG_NET_POLL_CONTROLLER
1465 static void netvsc_poll_controller(struct net_device *dev)
1466 {
1467 struct net_device_context *ndc = netdev_priv(dev);
1468 struct netvsc_device *ndev;
1469 int i;
1470
1471 rcu_read_lock();
1472 ndev = rcu_dereference(ndc->nvdev);
1473 if (ndev) {
1474 for (i = 0; i < ndev->num_chn; i++) {
1475 struct netvsc_channel *nvchan = &ndev->chan_table[i];
1476
1477 napi_schedule(&nvchan->napi);
1478 }
1479 }
1480 rcu_read_unlock();
1481 }
1482 #endif
1483
1484 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1485 {
1486 return NETVSC_HASH_KEYLEN;
1487 }
1488
1489 static u32 netvsc_rss_indir_size(struct net_device *dev)
1490 {
1491 return ITAB_NUM;
1492 }
1493
1494 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1495 u8 *hfunc)
1496 {
1497 struct net_device_context *ndc = netdev_priv(dev);
1498 struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1499 struct rndis_device *rndis_dev;
1500 int i;
1501
1502 if (!ndev)
1503 return -ENODEV;
1504
1505 if (hfunc)
1506 *hfunc = ETH_RSS_HASH_TOP; /* Toeplitz */
1507
1508 rndis_dev = ndev->extension;
1509 if (indir) {
1510 for (i = 0; i < ITAB_NUM; i++)
1511 indir[i] = rndis_dev->rx_table[i];
1512 }
1513
1514 if (key)
1515 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1516
1517 return 0;
1518 }
1519
1520 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1521 const u8 *key, const u8 hfunc)
1522 {
1523 struct net_device_context *ndc = netdev_priv(dev);
1524 struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1525 struct rndis_device *rndis_dev;
1526 int i;
1527
1528 if (!ndev)
1529 return -ENODEV;
1530
1531 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1532 return -EOPNOTSUPP;
1533
1534 rndis_dev = ndev->extension;
1535 if (indir) {
1536 for (i = 0; i < ITAB_NUM; i++)
1537 if (indir[i] >= ndev->num_chn)
1538 return -EINVAL;
1539
1540 for (i = 0; i < ITAB_NUM; i++)
1541 rndis_dev->rx_table[i] = indir[i];
1542 }
1543
1544 if (!key) {
1545 if (!indir)
1546 return 0;
1547
1548 key = rndis_dev->rss_key;
1549 }
1550
1551 return rndis_filter_set_rss_param(rndis_dev, key);
1552 }
1553
1554 /* Hyper-V RNDIS protocol does not have ring in the HW sense.
1555 * It does have pre-allocated receive area which is divided into sections.
1556 */
1557 static void __netvsc_get_ringparam(struct netvsc_device *nvdev,
1558 struct ethtool_ringparam *ring)
1559 {
1560 u32 max_buf_size;
1561
1562 ring->rx_pending = nvdev->recv_section_cnt;
1563 ring->tx_pending = nvdev->send_section_cnt;
1564
1565 if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
1566 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
1567 else
1568 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
1569
1570 ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;
1571 ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE
1572 / nvdev->send_section_size;
1573 }
1574
1575 static void netvsc_get_ringparam(struct net_device *ndev,
1576 struct ethtool_ringparam *ring)
1577 {
1578 struct net_device_context *ndevctx = netdev_priv(ndev);
1579 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1580
1581 if (!nvdev)
1582 return;
1583
1584 __netvsc_get_ringparam(nvdev, ring);
1585 }
1586
1587 static int netvsc_set_ringparam(struct net_device *ndev,
1588 struct ethtool_ringparam *ring)
1589 {
1590 struct net_device_context *ndevctx = netdev_priv(ndev);
1591 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1592 struct netvsc_device_info device_info;
1593 struct ethtool_ringparam orig;
1594 u32 new_tx, new_rx;
1595 int ret = 0;
1596
1597 if (!nvdev || nvdev->destroy)
1598 return -ENODEV;
1599
1600 memset(&orig, 0, sizeof(orig));
1601 __netvsc_get_ringparam(nvdev, &orig);
1602
1603 new_tx = clamp_t(u32, ring->tx_pending,
1604 NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);
1605 new_rx = clamp_t(u32, ring->rx_pending,
1606 NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);
1607
1608 if (new_tx == orig.tx_pending &&
1609 new_rx == orig.rx_pending)
1610 return 0; /* no change */
1611
1612 memset(&device_info, 0, sizeof(device_info));
1613 device_info.num_chn = nvdev->num_chn;
1614 device_info.send_sections = new_tx;
1615 device_info.send_section_size = nvdev->send_section_size;
1616 device_info.recv_sections = new_rx;
1617 device_info.recv_section_size = nvdev->recv_section_size;
1618
1619 ret = netvsc_detach(ndev, nvdev);
1620 if (ret)
1621 return ret;
1622
1623 ret = netvsc_attach(ndev, &device_info);
1624 if (ret) {
1625 device_info.send_sections = orig.tx_pending;
1626 device_info.recv_sections = orig.rx_pending;
1627
1628 if (netvsc_attach(ndev, &device_info))
1629 netdev_err(ndev, "restoring ringparam failed");
1630 }
1631
1632 return ret;
1633 }
1634
1635 static u32 netvsc_get_msglevel(struct net_device *ndev)
1636 {
1637 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1638
1639 return ndev_ctx->msg_enable;
1640 }
1641
1642 static void netvsc_set_msglevel(struct net_device *ndev, u32 val)
1643 {
1644 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1645
1646 ndev_ctx->msg_enable = val;
1647 }
1648
1649 static const struct ethtool_ops ethtool_ops = {
1650 .get_drvinfo = netvsc_get_drvinfo,
1651 .get_msglevel = netvsc_get_msglevel,
1652 .set_msglevel = netvsc_set_msglevel,
1653 .get_link = ethtool_op_get_link,
1654 .get_ethtool_stats = netvsc_get_ethtool_stats,
1655 .get_sset_count = netvsc_get_sset_count,
1656 .get_strings = netvsc_get_strings,
1657 .get_channels = netvsc_get_channels,
1658 .set_channels = netvsc_set_channels,
1659 .get_ts_info = ethtool_op_get_ts_info,
1660 .get_rxnfc = netvsc_get_rxnfc,
1661 .set_rxnfc = netvsc_set_rxnfc,
1662 .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1663 .get_rxfh_indir_size = netvsc_rss_indir_size,
1664 .get_rxfh = netvsc_get_rxfh,
1665 .set_rxfh = netvsc_set_rxfh,
1666 .get_link_ksettings = netvsc_get_link_ksettings,
1667 .set_link_ksettings = netvsc_set_link_ksettings,
1668 .get_ringparam = netvsc_get_ringparam,
1669 .set_ringparam = netvsc_set_ringparam,
1670 };
1671
1672 static const struct net_device_ops device_ops = {
1673 .ndo_open = netvsc_open,
1674 .ndo_stop = netvsc_close,
1675 .ndo_start_xmit = netvsc_start_xmit,
1676 .ndo_change_rx_flags = netvsc_change_rx_flags,
1677 .ndo_set_rx_mode = netvsc_set_rx_mode,
1678 .ndo_change_mtu = netvsc_change_mtu,
1679 .ndo_validate_addr = eth_validate_addr,
1680 .ndo_set_mac_address = netvsc_set_mac_addr,
1681 .ndo_select_queue = netvsc_select_queue,
1682 .ndo_get_stats64 = netvsc_get_stats64,
1683 #ifdef CONFIG_NET_POLL_CONTROLLER
1684 .ndo_poll_controller = netvsc_poll_controller,
1685 #endif
1686 };
1687
1688 /*
1689 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1690 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1691 * present send GARP packet to network peers with netif_notify_peers().
1692 */
1693 static void netvsc_link_change(struct work_struct *w)
1694 {
1695 struct net_device_context *ndev_ctx =
1696 container_of(w, struct net_device_context, dwork.work);
1697 struct hv_device *device_obj = ndev_ctx->device_ctx;
1698 struct net_device *net = hv_get_drvdata(device_obj);
1699 struct netvsc_device *net_device;
1700 struct rndis_device *rdev;
1701 struct netvsc_reconfig *event = NULL;
1702 bool notify = false, reschedule = false;
1703 unsigned long flags, next_reconfig, delay;
1704
1705 /* if changes are happening, comeback later */
1706 if (!rtnl_trylock()) {
1707 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1708 return;
1709 }
1710
1711 net_device = rtnl_dereference(ndev_ctx->nvdev);
1712 if (!net_device)
1713 goto out_unlock;
1714
1715 rdev = net_device->extension;
1716
1717 next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1718 if (time_is_after_jiffies(next_reconfig)) {
1719 /* link_watch only sends one notification with current state
1720 * per second, avoid doing reconfig more frequently. Handle
1721 * wrap around.
1722 */
1723 delay = next_reconfig - jiffies;
1724 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1725 schedule_delayed_work(&ndev_ctx->dwork, delay);
1726 goto out_unlock;
1727 }
1728 ndev_ctx->last_reconfig = jiffies;
1729
1730 spin_lock_irqsave(&ndev_ctx->lock, flags);
1731 if (!list_empty(&ndev_ctx->reconfig_events)) {
1732 event = list_first_entry(&ndev_ctx->reconfig_events,
1733 struct netvsc_reconfig, list);
1734 list_del(&event->list);
1735 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1736 }
1737 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1738
1739 if (!event)
1740 goto out_unlock;
1741
1742 switch (event->event) {
1743 /* Only the following events are possible due to the check in
1744 * netvsc_linkstatus_callback()
1745 */
1746 case RNDIS_STATUS_MEDIA_CONNECT:
1747 if (rdev->link_state) {
1748 rdev->link_state = false;
1749 netif_carrier_on(net);
1750 netif_tx_wake_all_queues(net);
1751 } else {
1752 notify = true;
1753 }
1754 kfree(event);
1755 break;
1756 case RNDIS_STATUS_MEDIA_DISCONNECT:
1757 if (!rdev->link_state) {
1758 rdev->link_state = true;
1759 netif_carrier_off(net);
1760 netif_tx_stop_all_queues(net);
1761 }
1762 kfree(event);
1763 break;
1764 case RNDIS_STATUS_NETWORK_CHANGE:
1765 /* Only makes sense if carrier is present */
1766 if (!rdev->link_state) {
1767 rdev->link_state = true;
1768 netif_carrier_off(net);
1769 netif_tx_stop_all_queues(net);
1770 event->event = RNDIS_STATUS_MEDIA_CONNECT;
1771 spin_lock_irqsave(&ndev_ctx->lock, flags);
1772 list_add(&event->list, &ndev_ctx->reconfig_events);
1773 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1774 reschedule = true;
1775 }
1776 break;
1777 }
1778
1779 rtnl_unlock();
1780
1781 if (notify)
1782 netdev_notify_peers(net);
1783
1784 /* link_watch only sends one notification with current state per
1785 * second, handle next reconfig event in 2 seconds.
1786 */
1787 if (reschedule)
1788 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1789
1790 return;
1791
1792 out_unlock:
1793 rtnl_unlock();
1794 }
1795
1796 static struct net_device *get_netvsc_bymac(const u8 *mac)
1797 {
1798 struct net_device_context *ndev_ctx;
1799
1800 list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
1801 struct net_device *dev = hv_get_drvdata(ndev_ctx->device_ctx);
1802
1803 if (ether_addr_equal(mac, dev->perm_addr))
1804 return dev;
1805 }
1806
1807 return NULL;
1808 }
1809
1810 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1811 {
1812 struct net_device_context *net_device_ctx;
1813 struct net_device *dev;
1814
1815 dev = netdev_master_upper_dev_get(vf_netdev);
1816 if (!dev || dev->netdev_ops != &device_ops)
1817 return NULL; /* not a netvsc device */
1818
1819 net_device_ctx = netdev_priv(dev);
1820 if (!rtnl_dereference(net_device_ctx->nvdev))
1821 return NULL; /* device is removed */
1822
1823 return dev;
1824 }
1825
1826 /* Called when VF is injecting data into network stack.
1827 * Change the associated network device from VF to netvsc.
1828 * note: already called with rcu_read_lock
1829 */
1830 static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
1831 {
1832 struct sk_buff *skb = *pskb;
1833 struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);
1834 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1835 struct netvsc_vf_pcpu_stats *pcpu_stats
1836 = this_cpu_ptr(ndev_ctx->vf_stats);
1837
1838 skb->dev = ndev;
1839
1840 u64_stats_update_begin(&pcpu_stats->syncp);
1841 pcpu_stats->rx_packets++;
1842 pcpu_stats->rx_bytes += skb->len;
1843 u64_stats_update_end(&pcpu_stats->syncp);
1844
1845 return RX_HANDLER_ANOTHER;
1846 }
1847
1848 static int netvsc_vf_join(struct net_device *vf_netdev,
1849 struct net_device *ndev)
1850 {
1851 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1852 int ret;
1853
1854 ret = netdev_rx_handler_register(vf_netdev,
1855 netvsc_vf_handle_frame, ndev);
1856 if (ret != 0) {
1857 netdev_err(vf_netdev,
1858 "can not register netvsc VF receive handler (err = %d)\n",
1859 ret);
1860 goto rx_handler_failed;
1861 }
1862
1863 ret = netdev_master_upper_dev_link(vf_netdev, ndev,
1864 NULL, NULL, NULL);
1865 if (ret != 0) {
1866 netdev_err(vf_netdev,
1867 "can not set master device %s (err = %d)\n",
1868 ndev->name, ret);
1869 goto upper_link_failed;
1870 }
1871
1872 /* set slave flag before open to prevent IPv6 addrconf */
1873 vf_netdev->flags |= IFF_SLAVE;
1874
1875 schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
1876
1877 call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
1878
1879 netdev_info(vf_netdev, "joined to %s\n", ndev->name);
1880 return 0;
1881
1882 upper_link_failed:
1883 netdev_rx_handler_unregister(vf_netdev);
1884 rx_handler_failed:
1885 return ret;
1886 }
1887
1888 static void __netvsc_vf_setup(struct net_device *ndev,
1889 struct net_device *vf_netdev)
1890 {
1891 int ret;
1892
1893 /* Align MTU of VF with master */
1894 ret = dev_set_mtu(vf_netdev, ndev->mtu);
1895 if (ret)
1896 netdev_warn(vf_netdev,
1897 "unable to change mtu to %u\n", ndev->mtu);
1898
1899 /* set multicast etc flags on VF */
1900 dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE);
1901
1902 /* sync address list from ndev to VF */
1903 netif_addr_lock_bh(ndev);
1904 dev_uc_sync(vf_netdev, ndev);
1905 dev_mc_sync(vf_netdev, ndev);
1906 netif_addr_unlock_bh(ndev);
1907
1908 if (netif_running(ndev)) {
1909 ret = dev_open(vf_netdev);
1910 if (ret)
1911 netdev_warn(vf_netdev,
1912 "unable to open: %d\n", ret);
1913 }
1914 }
1915
1916 /* Setup VF as slave of the synthetic device.
1917 * Runs in workqueue to avoid recursion in netlink callbacks.
1918 */
1919 static void netvsc_vf_setup(struct work_struct *w)
1920 {
1921 struct net_device_context *ndev_ctx
1922 = container_of(w, struct net_device_context, vf_takeover.work);
1923 struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
1924 struct net_device *vf_netdev;
1925
1926 if (!rtnl_trylock()) {
1927 schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
1928 return;
1929 }
1930
1931 vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
1932 if (vf_netdev)
1933 __netvsc_vf_setup(ndev, vf_netdev);
1934
1935 rtnl_unlock();
1936 }
1937
1938 static int netvsc_register_vf(struct net_device *vf_netdev)
1939 {
1940 struct net_device *ndev;
1941 struct net_device_context *net_device_ctx;
1942 struct netvsc_device *netvsc_dev;
1943 int ret;
1944
1945 if (vf_netdev->addr_len != ETH_ALEN)
1946 return NOTIFY_DONE;
1947
1948 /*
1949 * We will use the MAC address to locate the synthetic interface to
1950 * associate with the VF interface. If we don't find a matching
1951 * synthetic interface, move on.
1952 */
1953 ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1954 if (!ndev)
1955 return NOTIFY_DONE;
1956
1957 net_device_ctx = netdev_priv(ndev);
1958 netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1959 if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1960 return NOTIFY_DONE;
1961
1962 /* if syntihetic interface is a different namespace,
1963 * then move the VF to that namespace; join will be
1964 * done again in that context.
1965 */
1966 if (!net_eq(dev_net(ndev), dev_net(vf_netdev))) {
1967 ret = dev_change_net_namespace(vf_netdev,
1968 dev_net(ndev), "eth%d");
1969 if (ret)
1970 netdev_err(vf_netdev,
1971 "could not move to same namespace as %s: %d\n",
1972 ndev->name, ret);
1973 else
1974 netdev_info(vf_netdev,
1975 "VF moved to namespace with: %s\n",
1976 ndev->name);
1977 return NOTIFY_DONE;
1978 }
1979
1980 netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1981
1982 if (netvsc_vf_join(vf_netdev, ndev) != 0)
1983 return NOTIFY_DONE;
1984
1985 dev_hold(vf_netdev);
1986 rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1987 return NOTIFY_OK;
1988 }
1989
1990 /* VF up/down change detected, schedule to change data path */
1991 static int netvsc_vf_changed(struct net_device *vf_netdev)
1992 {
1993 struct net_device_context *net_device_ctx;
1994 struct netvsc_device *netvsc_dev;
1995 struct net_device *ndev;
1996 bool vf_is_up = netif_running(vf_netdev);
1997
1998 ndev = get_netvsc_byref(vf_netdev);
1999 if (!ndev)
2000 return NOTIFY_DONE;
2001
2002 net_device_ctx = netdev_priv(ndev);
2003 netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
2004 if (!netvsc_dev)
2005 return NOTIFY_DONE;
2006
2007 netvsc_switch_datapath(ndev, vf_is_up);
2008 netdev_info(ndev, "Data path switched %s VF: %s\n",
2009 vf_is_up ? "to" : "from", vf_netdev->name);
2010
2011 return NOTIFY_OK;
2012 }
2013
2014 static int netvsc_unregister_vf(struct net_device *vf_netdev)
2015 {
2016 struct net_device *ndev;
2017 struct net_device_context *net_device_ctx;
2018
2019 ndev = get_netvsc_byref(vf_netdev);
2020 if (!ndev)
2021 return NOTIFY_DONE;
2022
2023 net_device_ctx = netdev_priv(ndev);
2024 cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
2025
2026 netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
2027
2028 netdev_rx_handler_unregister(vf_netdev);
2029 netdev_upper_dev_unlink(vf_netdev, ndev);
2030 RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
2031 dev_put(vf_netdev);
2032
2033 return NOTIFY_OK;
2034 }
2035
2036 static int netvsc_probe(struct hv_device *dev,
2037 const struct hv_vmbus_device_id *dev_id)
2038 {
2039 struct net_device *net = NULL;
2040 struct net_device_context *net_device_ctx;
2041 struct netvsc_device_info device_info;
2042 struct netvsc_device *nvdev;
2043 int ret = -ENOMEM;
2044
2045 net = alloc_etherdev_mq(sizeof(struct net_device_context),
2046 VRSS_CHANNEL_MAX);
2047 if (!net)
2048 goto no_net;
2049
2050 netif_carrier_off(net);
2051
2052 netvsc_init_settings(net);
2053
2054 net_device_ctx = netdev_priv(net);
2055 net_device_ctx->device_ctx = dev;
2056 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
2057 if (netif_msg_probe(net_device_ctx))
2058 netdev_dbg(net, "netvsc msg_enable: %d\n",
2059 net_device_ctx->msg_enable);
2060
2061 hv_set_drvdata(dev, net);
2062
2063 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
2064
2065 spin_lock_init(&net_device_ctx->lock);
2066 INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
2067 INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
2068
2069 net_device_ctx->vf_stats
2070 = netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
2071 if (!net_device_ctx->vf_stats)
2072 goto no_stats;
2073
2074 net->netdev_ops = &device_ops;
2075 net->ethtool_ops = &ethtool_ops;
2076 SET_NETDEV_DEV(net, &dev->device);
2077
2078 /* We always need headroom for rndis header */
2079 net->needed_headroom = RNDIS_AND_PPI_SIZE;
2080
2081 /* Initialize the number of queues to be 1, we may change it if more
2082 * channels are offered later.
2083 */
2084 netif_set_real_num_tx_queues(net, 1);
2085 netif_set_real_num_rx_queues(net, 1);
2086
2087 /* Notify the netvsc driver of the new device */
2088 memset(&device_info, 0, sizeof(device_info));
2089 device_info.num_chn = VRSS_CHANNEL_DEFAULT;
2090 device_info.send_sections = NETVSC_DEFAULT_TX;
2091 device_info.send_section_size = NETVSC_SEND_SECTION_SIZE;
2092 device_info.recv_sections = NETVSC_DEFAULT_RX;
2093 device_info.recv_section_size = NETVSC_RECV_SECTION_SIZE;
2094
2095 nvdev = rndis_filter_device_add(dev, &device_info);
2096 if (IS_ERR(nvdev)) {
2097 ret = PTR_ERR(nvdev);
2098 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
2099 goto rndis_failed;
2100 }
2101
2102 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
2103
2104 if (nvdev->num_chn > 1)
2105 schedule_work(&nvdev->subchan_work);
2106
2107 /* hw_features computed in rndis_netdev_set_hwcaps() */
2108 net->features = net->hw_features |
2109 NETIF_F_HIGHDMA | NETIF_F_SG |
2110 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2111 net->vlan_features = net->features;
2112
2113 netdev_lockdep_set_classes(net);
2114
2115 /* MTU range: 68 - 1500 or 65521 */
2116 net->min_mtu = NETVSC_MTU_MIN;
2117 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
2118 net->max_mtu = NETVSC_MTU - ETH_HLEN;
2119 else
2120 net->max_mtu = ETH_DATA_LEN;
2121
2122 rtnl_lock();
2123 ret = register_netdevice(net);
2124 if (ret != 0) {
2125 pr_err("Unable to register netdev.\n");
2126 goto register_failed;
2127 }
2128
2129 list_add(&net_device_ctx->list, &netvsc_dev_list);
2130 rtnl_unlock();
2131 return 0;
2132
2133 register_failed:
2134 rtnl_unlock();
2135 rndis_filter_device_remove(dev, nvdev);
2136 rndis_failed:
2137 free_percpu(net_device_ctx->vf_stats);
2138 no_stats:
2139 hv_set_drvdata(dev, NULL);
2140 free_netdev(net);
2141 no_net:
2142 return ret;
2143 }
2144
2145 static int netvsc_remove(struct hv_device *dev)
2146 {
2147 struct net_device_context *ndev_ctx;
2148 struct net_device *vf_netdev, *net;
2149 struct netvsc_device *nvdev;
2150
2151 net = hv_get_drvdata(dev);
2152 if (net == NULL) {
2153 dev_err(&dev->device, "No net device to remove\n");
2154 return 0;
2155 }
2156
2157 ndev_ctx = netdev_priv(net);
2158
2159 cancel_delayed_work_sync(&ndev_ctx->dwork);
2160
2161 rcu_read_lock();
2162 nvdev = rcu_dereference(ndev_ctx->nvdev);
2163
2164 if (nvdev)
2165 cancel_work_sync(&nvdev->subchan_work);
2166
2167 /*
2168 * Call to the vsc driver to let it know that the device is being
2169 * removed. Also blocks mtu and channel changes.
2170 */
2171 rtnl_lock();
2172 vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
2173 if (vf_netdev)
2174 netvsc_unregister_vf(vf_netdev);
2175
2176 if (nvdev)
2177 rndis_filter_device_remove(dev, nvdev);
2178
2179 unregister_netdevice(net);
2180 list_del(&ndev_ctx->list);
2181
2182 rtnl_unlock();
2183 rcu_read_unlock();
2184
2185 hv_set_drvdata(dev, NULL);
2186
2187 free_percpu(ndev_ctx->vf_stats);
2188 free_netdev(net);
2189 return 0;
2190 }
2191
2192 static const struct hv_vmbus_device_id id_table[] = {
2193 /* Network guid */
2194 { HV_NIC_GUID, },
2195 { },
2196 };
2197
2198 MODULE_DEVICE_TABLE(vmbus, id_table);
2199
2200 /* The one and only one */
2201 static struct hv_driver netvsc_drv = {
2202 .name = KBUILD_MODNAME,
2203 .id_table = id_table,
2204 .probe = netvsc_probe,
2205 .remove = netvsc_remove,
2206 };
2207
2208 /*
2209 * On Hyper-V, every VF interface is matched with a corresponding
2210 * synthetic interface. The synthetic interface is presented first
2211 * to the guest. When the corresponding VF instance is registered,
2212 * we will take care of switching the data path.
2213 */
2214 static int netvsc_netdev_event(struct notifier_block *this,
2215 unsigned long event, void *ptr)
2216 {
2217 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2218
2219 /* Skip our own events */
2220 if (event_dev->netdev_ops == &device_ops)
2221 return NOTIFY_DONE;
2222
2223 /* Avoid non-Ethernet type devices */
2224 if (event_dev->type != ARPHRD_ETHER)
2225 return NOTIFY_DONE;
2226
2227 /* Avoid Vlan dev with same MAC registering as VF */
2228 if (is_vlan_dev(event_dev))
2229 return NOTIFY_DONE;
2230
2231 /* Avoid Bonding master dev with same MAC registering as VF */
2232 if ((event_dev->priv_flags & IFF_BONDING) &&
2233 (event_dev->flags & IFF_MASTER))
2234 return NOTIFY_DONE;
2235
2236 switch (event) {
2237 case NETDEV_REGISTER:
2238 return netvsc_register_vf(event_dev);
2239 case NETDEV_UNREGISTER:
2240 return netvsc_unregister_vf(event_dev);
2241 case NETDEV_UP:
2242 case NETDEV_DOWN:
2243 return netvsc_vf_changed(event_dev);
2244 default:
2245 return NOTIFY_DONE;
2246 }
2247 }
2248
2249 static struct notifier_block netvsc_netdev_notifier = {
2250 .notifier_call = netvsc_netdev_event,
2251 };
2252
2253 static void __exit netvsc_drv_exit(void)
2254 {
2255 unregister_netdevice_notifier(&netvsc_netdev_notifier);
2256 vmbus_driver_unregister(&netvsc_drv);
2257 }
2258
2259 static int __init netvsc_drv_init(void)
2260 {
2261 int ret;
2262
2263 if (ring_size < RING_SIZE_MIN) {
2264 ring_size = RING_SIZE_MIN;
2265 pr_info("Increased ring_size to %u (min allowed)\n",
2266 ring_size);
2267 }
2268 netvsc_ring_bytes = ring_size * PAGE_SIZE;
2269
2270 ret = vmbus_driver_register(&netvsc_drv);
2271 if (ret)
2272 return ret;
2273
2274 register_netdevice_notifier(&netvsc_netdev_notifier);
2275 return 0;
2276 }
2277
2278 MODULE_LICENSE("GPL");
2279 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
2280
2281 module_init(netvsc_drv_init);
2282 module_exit(netvsc_drv_exit);
Linux with added FPC-III support