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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / net / hyperv / netvsc_drv.c
blobcdb78eefab671496d5b6c406c34b25e95278d14b
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 #include <linux/reciprocal_div.h>
39
40 #include <net/arp.h>
41 #include <net/route.h>
42 #include <net/sock.h>
43 #include <net/pkt_sched.h>
44 #include <net/checksum.h>
45 #include <net/ip6_checksum.h>
46
47 #include "hyperv_net.h"
48
49 #define RING_SIZE_MIN 64
50
51 #define LINKCHANGE_INT (2 * HZ)
52 #define VF_TAKEOVER_INT (HZ / 10)
53
54 static unsigned int ring_size __ro_after_init = 128;
55 module_param(ring_size, uint, S_IRUGO);
56 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
57 unsigned int netvsc_ring_bytes __ro_after_init;
58 struct reciprocal_value netvsc_ring_reciprocal __ro_after_init;
59
60 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
61 NETIF_MSG_LINK | NETIF_MSG_IFUP |
62 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
63 NETIF_MSG_TX_ERR;
64
65 static int debug = -1;
66 module_param(debug, int, S_IRUGO);
67 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
68
69 static void netvsc_change_rx_flags(struct net_device *net, int change)
70 {
71 struct net_device_context *ndev_ctx = netdev_priv(net);
72 struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
73 int inc;
74
75 if (!vf_netdev)
76 return;
77
78 if (change & IFF_PROMISC) {
79 inc = (net->flags & IFF_PROMISC) ? 1 : -1;
80 dev_set_promiscuity(vf_netdev, inc);
81 }
82
83 if (change & IFF_ALLMULTI) {
84 inc = (net->flags & IFF_ALLMULTI) ? 1 : -1;
85 dev_set_allmulti(vf_netdev, inc);
86 }
87 }
88
89 static void netvsc_set_rx_mode(struct net_device *net)
90 {
91 struct net_device_context *ndev_ctx = netdev_priv(net);
92 struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
93 struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);
94
95 if (vf_netdev) {
96 dev_uc_sync(vf_netdev, net);
97 dev_mc_sync(vf_netdev, net);
98 }
99
100 rndis_filter_update(nvdev);
101 }
102
103 static int netvsc_open(struct net_device *net)
104 {
105 struct net_device_context *ndev_ctx = netdev_priv(net);
106 struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
107 struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);
108 struct rndis_device *rdev;
109 int ret = 0;
110
111 netif_carrier_off(net);
112
113 /* Open up the device */
114 ret = rndis_filter_open(nvdev);
115 if (ret != 0) {
116 netdev_err(net, "unable to open device (ret %d).\n", ret);
117 return ret;
118 }
119
120 rdev = nvdev->extension;
121 if (!rdev->link_state) {
122 netif_carrier_on(net);
123 netif_tx_wake_all_queues(net);
124 }
125
126 if (vf_netdev) {
127 /* Setting synthetic device up transparently sets
128 * slave as up. If open fails, then slave will be
129 * still be offline (and not used).
130 */
131 ret = dev_open(vf_netdev);
132 if (ret)
133 netdev_warn(net,
134 "unable to open slave: %s: %d\n",
135 vf_netdev->name, ret);
136 }
137 return 0;
138 }
139
140 static int netvsc_close(struct net_device *net)
141 {
142 struct net_device_context *net_device_ctx = netdev_priv(net);
143 struct net_device *vf_netdev
144 = rtnl_dereference(net_device_ctx->vf_netdev);
145 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
146 int ret = 0;
147 u32 aread, i, msec = 10, retry = 0, retry_max = 20;
148 struct vmbus_channel *chn;
149
150 netif_tx_disable(net);
151
152 /* No need to close rndis filter if it is removed already */
153 if (!nvdev)
154 goto out;
155
156 ret = rndis_filter_close(nvdev);
157 if (ret != 0) {
158 netdev_err(net, "unable to close device (ret %d).\n", ret);
159 return ret;
160 }
161
162 /* Ensure pending bytes in ring are read */
163 while (true) {
164 aread = 0;
165 for (i = 0; i < nvdev->num_chn; i++) {
166 chn = nvdev->chan_table[i].channel;
167 if (!chn)
168 continue;
169
170 aread = hv_get_bytes_to_read(&chn->inbound);
171 if (aread)
172 break;
173
174 aread = hv_get_bytes_to_read(&chn->outbound);
175 if (aread)
176 break;
177 }
178
179 retry++;
180 if (retry > retry_max || aread == 0)
181 break;
182
183 msleep(msec);
184
185 if (msec < 1000)
186 msec *= 2;
187 }
188
189 if (aread) {
190 netdev_err(net, "Ring buffer not empty after closing rndis\n");
191 ret = -ETIMEDOUT;
192 }
193
194 out:
195 if (vf_netdev)
196 dev_close(vf_netdev);
197
198 return ret;
199 }
200
201 static inline void *init_ppi_data(struct rndis_message *msg,
202 u32 ppi_size, u32 pkt_type)
203 {
204 struct rndis_packet *rndis_pkt = &msg->msg.pkt;
205 struct rndis_per_packet_info *ppi;
206
207 rndis_pkt->data_offset += ppi_size;
208 ppi = (void *)rndis_pkt + rndis_pkt->per_pkt_info_offset
209 + rndis_pkt->per_pkt_info_len;
210
211 ppi->size = ppi_size;
212 ppi->type = pkt_type;
213 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
214
215 rndis_pkt->per_pkt_info_len += ppi_size;
216
217 return ppi + 1;
218 }
219
220 /* Azure hosts don't support non-TCP port numbers in hashing for fragmented
221 * packets. We can use ethtool to change UDP hash level when necessary.
222 */
223 static inline u32 netvsc_get_hash(
224 struct sk_buff *skb,
225 const struct net_device_context *ndc)
226 {
227 struct flow_keys flow;
228 u32 hash, pkt_proto = 0;
229 static u32 hashrnd __read_mostly;
230
231 net_get_random_once(&hashrnd, sizeof(hashrnd));
232
233 if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
234 return 0;
235
236 switch (flow.basic.ip_proto) {
237 case IPPROTO_TCP:
238 if (flow.basic.n_proto == htons(ETH_P_IP))
239 pkt_proto = HV_TCP4_L4HASH;
240 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
241 pkt_proto = HV_TCP6_L4HASH;
242
243 break;
244
245 case IPPROTO_UDP:
246 if (flow.basic.n_proto == htons(ETH_P_IP))
247 pkt_proto = HV_UDP4_L4HASH;
248 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
249 pkt_proto = HV_UDP6_L4HASH;
250
251 break;
252 }
253
254 if (pkt_proto & ndc->l4_hash) {
255 return skb_get_hash(skb);
256 } else {
257 if (flow.basic.n_proto == htons(ETH_P_IP))
258 hash = jhash2((u32 *)&flow.addrs.v4addrs, 2, hashrnd);
259 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
260 hash = jhash2((u32 *)&flow.addrs.v6addrs, 8, hashrnd);
261 else
262 hash = 0;
263
264 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
265 }
266
267 return hash;
268 }
269
270 static inline int netvsc_get_tx_queue(struct net_device *ndev,
271 struct sk_buff *skb, int old_idx)
272 {
273 const struct net_device_context *ndc = netdev_priv(ndev);
274 struct sock *sk = skb->sk;
275 int q_idx;
276
277 q_idx = ndc->tx_table[netvsc_get_hash(skb, ndc) &
278 (VRSS_SEND_TAB_SIZE - 1)];
279
280 /* If queue index changed record the new value */
281 if (q_idx != old_idx &&
282 sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
283 sk_tx_queue_set(sk, q_idx);
284
285 return q_idx;
286 }
287
288 /*
289 * Select queue for transmit.
290 *
291 * If a valid queue has already been assigned, then use that.
292 * Otherwise compute tx queue based on hash and the send table.
293 *
294 * This is basically similar to default (__netdev_pick_tx) with the added step
295 * of using the host send_table when no other queue has been assigned.
296 *
297 * TODO support XPS - but get_xps_queue not exported
298 */
299 static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)
300 {
301 int q_idx = sk_tx_queue_get(skb->sk);
302
303 if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {
304 /* If forwarding a packet, we use the recorded queue when
305 * available for better cache locality.
306 */
307 if (skb_rx_queue_recorded(skb))
308 q_idx = skb_get_rx_queue(skb);
309 else
310 q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);
311 }
312
313 return q_idx;
314 }
315
316 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
317 void *accel_priv,
318 select_queue_fallback_t fallback)
319 {
320 struct net_device_context *ndc = netdev_priv(ndev);
321 struct net_device *vf_netdev;
322 u16 txq;
323
324 rcu_read_lock();
325 vf_netdev = rcu_dereference(ndc->vf_netdev);
326 if (vf_netdev) {
327 const struct net_device_ops *vf_ops = vf_netdev->netdev_ops;
328
329 if (vf_ops->ndo_select_queue)
330 txq = vf_ops->ndo_select_queue(vf_netdev, skb,
331 accel_priv, fallback);
332 else
333 txq = fallback(vf_netdev, skb);
334
335 /* Record the queue selected by VF so that it can be
336 * used for common case where VF has more queues than
337 * the synthetic device.
338 */
339 qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq;
340 } else {
341 txq = netvsc_pick_tx(ndev, skb);
342 }
343 rcu_read_unlock();
344
345 while (unlikely(txq >= ndev->real_num_tx_queues))
346 txq -= ndev->real_num_tx_queues;
347
348 return txq;
349 }
350
351 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
352 struct hv_page_buffer *pb)
353 {
354 int j = 0;
355
356 /* Deal with compund pages by ignoring unused part
357 * of the page.
358 */
359 page += (offset >> PAGE_SHIFT);
360 offset &= ~PAGE_MASK;
361
362 while (len > 0) {
363 unsigned long bytes;
364
365 bytes = PAGE_SIZE - offset;
366 if (bytes > len)
367 bytes = len;
368 pb[j].pfn = page_to_pfn(page);
369 pb[j].offset = offset;
370 pb[j].len = bytes;
371
372 offset += bytes;
373 len -= bytes;
374
375 if (offset == PAGE_SIZE && len) {
376 page++;
377 offset = 0;
378 j++;
379 }
380 }
381
382 return j + 1;
383 }
384
385 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
386 struct hv_netvsc_packet *packet,
387 struct hv_page_buffer *pb)
388 {
389 u32 slots_used = 0;
390 char *data = skb->data;
391 int frags = skb_shinfo(skb)->nr_frags;
392 int i;
393
394 /* The packet is laid out thus:
395 * 1. hdr: RNDIS header and PPI
396 * 2. skb linear data
397 * 3. skb fragment data
398 */
399 slots_used += fill_pg_buf(virt_to_page(hdr),
400 offset_in_page(hdr),
401 len, &pb[slots_used]);
402
403 packet->rmsg_size = len;
404 packet->rmsg_pgcnt = slots_used;
405
406 slots_used += fill_pg_buf(virt_to_page(data),
407 offset_in_page(data),
408 skb_headlen(skb), &pb[slots_used]);
409
410 for (i = 0; i < frags; i++) {
411 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
412
413 slots_used += fill_pg_buf(skb_frag_page(frag),
414 frag->page_offset,
415 skb_frag_size(frag), &pb[slots_used]);
416 }
417 return slots_used;
418 }
419
420 static int count_skb_frag_slots(struct sk_buff *skb)
421 {
422 int i, frags = skb_shinfo(skb)->nr_frags;
423 int pages = 0;
424
425 for (i = 0; i < frags; i++) {
426 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
427 unsigned long size = skb_frag_size(frag);
428 unsigned long offset = frag->page_offset;
429
430 /* Skip unused frames from start of page */
431 offset &= ~PAGE_MASK;
432 pages += PFN_UP(offset + size);
433 }
434 return pages;
435 }
436
437 static int netvsc_get_slots(struct sk_buff *skb)
438 {
439 char *data = skb->data;
440 unsigned int offset = offset_in_page(data);
441 unsigned int len = skb_headlen(skb);
442 int slots;
443 int frag_slots;
444
445 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
446 frag_slots = count_skb_frag_slots(skb);
447 return slots + frag_slots;
448 }
449
450 static u32 net_checksum_info(struct sk_buff *skb)
451 {
452 if (skb->protocol == htons(ETH_P_IP)) {
453 struct iphdr *ip = ip_hdr(skb);
454
455 if (ip->protocol == IPPROTO_TCP)
456 return TRANSPORT_INFO_IPV4_TCP;
457 else if (ip->protocol == IPPROTO_UDP)
458 return TRANSPORT_INFO_IPV4_UDP;
459 } else {
460 struct ipv6hdr *ip6 = ipv6_hdr(skb);
461
462 if (ip6->nexthdr == IPPROTO_TCP)
463 return TRANSPORT_INFO_IPV6_TCP;
464 else if (ip6->nexthdr == IPPROTO_UDP)
465 return TRANSPORT_INFO_IPV6_UDP;
466 }
467
468 return TRANSPORT_INFO_NOT_IP;
469 }
470
471 /* Send skb on the slave VF device. */
472 static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
473 struct sk_buff *skb)
474 {
475 struct net_device_context *ndev_ctx = netdev_priv(net);
476 unsigned int len = skb->len;
477 int rc;
478
479 skb->dev = vf_netdev;
480 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
481
482 rc = dev_queue_xmit(skb);
483 if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {
484 struct netvsc_vf_pcpu_stats *pcpu_stats
485 = this_cpu_ptr(ndev_ctx->vf_stats);
486
487 u64_stats_update_begin(&pcpu_stats->syncp);
488 pcpu_stats->tx_packets++;
489 pcpu_stats->tx_bytes += len;
490 u64_stats_update_end(&pcpu_stats->syncp);
491 } else {
492 this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);
493 }
494
495 return rc;
496 }
497
498 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
499 {
500 struct net_device_context *net_device_ctx = netdev_priv(net);
501 struct hv_netvsc_packet *packet = NULL;
502 int ret;
503 unsigned int num_data_pgs;
504 struct rndis_message *rndis_msg;
505 struct net_device *vf_netdev;
506 u32 rndis_msg_size;
507 u32 hash;
508 struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
509
510 /* if VF is present and up then redirect packets
511 * already called with rcu_read_lock_bh
512 */
513 vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
514 if (vf_netdev && netif_running(vf_netdev) &&
515 !netpoll_tx_running(net))
516 return netvsc_vf_xmit(net, vf_netdev, skb);
517
518 /* We will atmost need two pages to describe the rndis
519 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
520 * of pages in a single packet. If skb is scattered around
521 * more pages we try linearizing it.
522 */
523
524 num_data_pgs = netvsc_get_slots(skb) + 2;
525
526 if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
527 ++net_device_ctx->eth_stats.tx_scattered;
528
529 if (skb_linearize(skb))
530 goto no_memory;
531
532 num_data_pgs = netvsc_get_slots(skb) + 2;
533 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
534 ++net_device_ctx->eth_stats.tx_too_big;
535 goto drop;
536 }
537 }
538
539 /*
540 * Place the rndis header in the skb head room and
541 * the skb->cb will be used for hv_netvsc_packet
542 * structure.
543 */
544 ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
545 if (ret)
546 goto no_memory;
547
548 /* Use the skb control buffer for building up the packet */
549 BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
550 FIELD_SIZEOF(struct sk_buff, cb));
551 packet = (struct hv_netvsc_packet *)skb->cb;
552
553 packet->q_idx = skb_get_queue_mapping(skb);
554
555 packet->total_data_buflen = skb->len;
556 packet->total_bytes = skb->len;
557 packet->total_packets = 1;
558
559 rndis_msg = (struct rndis_message *)skb->head;
560
561 /* Add the rndis header */
562 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
563 rndis_msg->msg_len = packet->total_data_buflen;
564
565 rndis_msg->msg.pkt = (struct rndis_packet) {
566 .data_offset = sizeof(struct rndis_packet),
567 .data_len = packet->total_data_buflen,
568 .per_pkt_info_offset = sizeof(struct rndis_packet),
569 };
570
571 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
572
573 hash = skb_get_hash_raw(skb);
574 if (hash != 0 && net->real_num_tx_queues > 1) {
575 u32 *hash_info;
576
577 rndis_msg_size += NDIS_HASH_PPI_SIZE;
578 hash_info = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
579 NBL_HASH_VALUE);
580 *hash_info = hash;
581 }
582
583 if (skb_vlan_tag_present(skb)) {
584 struct ndis_pkt_8021q_info *vlan;
585
586 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
587 vlan = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
588 IEEE_8021Q_INFO);
589
590 vlan->value = 0;
591 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
592 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
593 VLAN_PRIO_SHIFT;
594 }
595
596 if (skb_is_gso(skb)) {
597 struct ndis_tcp_lso_info *lso_info;
598
599 rndis_msg_size += NDIS_LSO_PPI_SIZE;
600 lso_info = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
601 TCP_LARGESEND_PKTINFO);
602
603 lso_info->value = 0;
604 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
605 if (skb->protocol == htons(ETH_P_IP)) {
606 lso_info->lso_v2_transmit.ip_version =
607 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
608 ip_hdr(skb)->tot_len = 0;
609 ip_hdr(skb)->check = 0;
610 tcp_hdr(skb)->check =
611 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
612 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
613 } else {
614 lso_info->lso_v2_transmit.ip_version =
615 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
616 ipv6_hdr(skb)->payload_len = 0;
617 tcp_hdr(skb)->check =
618 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
619 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
620 }
621 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
622 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
623 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
624 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
625 struct ndis_tcp_ip_checksum_info *csum_info;
626
627 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
628 csum_info = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
629 TCPIP_CHKSUM_PKTINFO);
630
631 csum_info->value = 0;
632 csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
633
634 if (skb->protocol == htons(ETH_P_IP)) {
635 csum_info->transmit.is_ipv4 = 1;
636
637 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
638 csum_info->transmit.tcp_checksum = 1;
639 else
640 csum_info->transmit.udp_checksum = 1;
641 } else {
642 csum_info->transmit.is_ipv6 = 1;
643
644 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
645 csum_info->transmit.tcp_checksum = 1;
646 else
647 csum_info->transmit.udp_checksum = 1;
648 }
649 } else {
650 /* Can't do offload of this type of checksum */
651 if (skb_checksum_help(skb))
652 goto drop;
653 }
654 }
655
656 /* Start filling in the page buffers with the rndis hdr */
657 rndis_msg->msg_len += rndis_msg_size;
658 packet->total_data_buflen = rndis_msg->msg_len;
659 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
660 skb, packet, pb);
661
662 /* timestamp packet in software */
663 skb_tx_timestamp(skb);
664
665 ret = netvsc_send(net, packet, rndis_msg, pb, skb);
666 if (likely(ret == 0))
667 return NETDEV_TX_OK;
668
669 if (ret == -EAGAIN) {
670 ++net_device_ctx->eth_stats.tx_busy;
671 return NETDEV_TX_BUSY;
672 }
673
674 if (ret == -ENOSPC)
675 ++net_device_ctx->eth_stats.tx_no_space;
676
677 drop:
678 dev_kfree_skb_any(skb);
679 net->stats.tx_dropped++;
680
681 return NETDEV_TX_OK;
682
683 no_memory:
684 ++net_device_ctx->eth_stats.tx_no_memory;
685 goto drop;
686 }
687
688 /*
689 * netvsc_linkstatus_callback - Link up/down notification
690 */
691 void netvsc_linkstatus_callback(struct net_device *net,
692 struct rndis_message *resp)
693 {
694 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
695 struct net_device_context *ndev_ctx = netdev_priv(net);
696 struct netvsc_reconfig *event;
697 unsigned long flags;
698
699 /* Update the physical link speed when changing to another vSwitch */
700 if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
701 u32 speed;
702
703 speed = *(u32 *)((void *)indicate
704 + indicate->status_buf_offset) / 10000;
705 ndev_ctx->speed = speed;
706 return;
707 }
708
709 /* Handle these link change statuses below */
710 if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
711 indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
712 indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
713 return;
714
715 if (net->reg_state != NETREG_REGISTERED)
716 return;
717
718 event = kzalloc(sizeof(*event), GFP_ATOMIC);
719 if (!event)
720 return;
721 event->event = indicate->status;
722
723 spin_lock_irqsave(&ndev_ctx->lock, flags);
724 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
725 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
726
727 schedule_delayed_work(&ndev_ctx->dwork, 0);
728 }
729
730 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
731 struct napi_struct *napi,
732 const struct ndis_tcp_ip_checksum_info *csum_info,
733 const struct ndis_pkt_8021q_info *vlan,
734 void *data, u32 buflen)
735 {
736 struct sk_buff *skb;
737
738 skb = napi_alloc_skb(napi, buflen);
739 if (!skb)
740 return skb;
741
742 /*
743 * Copy to skb. This copy is needed here since the memory pointed by
744 * hv_netvsc_packet cannot be deallocated
745 */
746 skb_put_data(skb, data, buflen);
747
748 skb->protocol = eth_type_trans(skb, net);
749
750 /* skb is already created with CHECKSUM_NONE */
751 skb_checksum_none_assert(skb);
752
753 /*
754 * In Linux, the IP checksum is always checked.
755 * Do L4 checksum offload if enabled and present.
756 */
757 if (csum_info && (net->features & NETIF_F_RXCSUM)) {
758 if (csum_info->receive.tcp_checksum_succeeded ||
759 csum_info->receive.udp_checksum_succeeded)
760 skb->ip_summed = CHECKSUM_UNNECESSARY;
761 }
762
763 if (vlan) {
764 u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
765
766 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
767 vlan_tci);
768 }
769
770 return skb;
771 }
772
773 /*
774 * netvsc_recv_callback - Callback when we receive a packet from the
775 * "wire" on the specified device.
776 */
777 int netvsc_recv_callback(struct net_device *net,
778 struct netvsc_device *net_device,
779 struct vmbus_channel *channel,
780 void *data, u32 len,
781 const struct ndis_tcp_ip_checksum_info *csum_info,
782 const struct ndis_pkt_8021q_info *vlan)
783 {
784 struct net_device_context *net_device_ctx = netdev_priv(net);
785 u16 q_idx = channel->offermsg.offer.sub_channel_index;
786 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
787 struct sk_buff *skb;
788 struct netvsc_stats *rx_stats;
789
790 if (net->reg_state != NETREG_REGISTERED)
791 return NVSP_STAT_FAIL;
792
793 /* Allocate a skb - TODO direct I/O to pages? */
794 skb = netvsc_alloc_recv_skb(net, &nvchan->napi,
795 csum_info, vlan, data, len);
796 if (unlikely(!skb)) {
797 ++net_device_ctx->eth_stats.rx_no_memory;
798 rcu_read_unlock();
799 return NVSP_STAT_FAIL;
800 }
801
802 skb_record_rx_queue(skb, q_idx);
803
804 /*
805 * Even if injecting the packet, record the statistics
806 * on the synthetic device because modifying the VF device
807 * statistics will not work correctly.
808 */
809 rx_stats = &nvchan->rx_stats;
810 u64_stats_update_begin(&rx_stats->syncp);
811 rx_stats->packets++;
812 rx_stats->bytes += len;
813
814 if (skb->pkt_type == PACKET_BROADCAST)
815 ++rx_stats->broadcast;
816 else if (skb->pkt_type == PACKET_MULTICAST)
817 ++rx_stats->multicast;
818 u64_stats_update_end(&rx_stats->syncp);
819
820 napi_gro_receive(&nvchan->napi, skb);
821 return 0;
822 }
823
824 static void netvsc_get_drvinfo(struct net_device *net,
825 struct ethtool_drvinfo *info)
826 {
827 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
828 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
829 }
830
831 static void netvsc_get_channels(struct net_device *net,
832 struct ethtool_channels *channel)
833 {
834 struct net_device_context *net_device_ctx = netdev_priv(net);
835 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
836
837 if (nvdev) {
838 channel->max_combined = nvdev->max_chn;
839 channel->combined_count = nvdev->num_chn;
840 }
841 }
842
843 static int netvsc_set_channels(struct net_device *net,
844 struct ethtool_channels *channels)
845 {
846 struct net_device_context *net_device_ctx = netdev_priv(net);
847 struct hv_device *dev = net_device_ctx->device_ctx;
848 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
849 unsigned int orig, count = channels->combined_count;
850 struct netvsc_device_info device_info;
851 bool was_opened;
852 int ret = 0;
853
854 /* We do not support separate count for rx, tx, or other */
855 if (count == 0 ||
856 channels->rx_count || channels->tx_count || channels->other_count)
857 return -EINVAL;
858
859 if (!nvdev || nvdev->destroy)
860 return -ENODEV;
861
862 if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
863 return -EINVAL;
864
865 if (count > nvdev->max_chn)
866 return -EINVAL;
867
868 orig = nvdev->num_chn;
869 was_opened = rndis_filter_opened(nvdev);
870 if (was_opened)
871 rndis_filter_close(nvdev);
872
873 memset(&device_info, 0, sizeof(device_info));
874 device_info.num_chn = count;
875 device_info.send_sections = nvdev->send_section_cnt;
876 device_info.send_section_size = nvdev->send_section_size;
877 device_info.recv_sections = nvdev->recv_section_cnt;
878 device_info.recv_section_size = nvdev->recv_section_size;
879
880 rndis_filter_device_remove(dev, nvdev);
881
882 nvdev = rndis_filter_device_add(dev, &device_info);
883 if (IS_ERR(nvdev)) {
884 ret = PTR_ERR(nvdev);
885 device_info.num_chn = orig;
886 nvdev = rndis_filter_device_add(dev, &device_info);
887
888 if (IS_ERR(nvdev)) {
889 netdev_err(net, "restoring channel setting failed: %ld\n",
890 PTR_ERR(nvdev));
891 return ret;
892 }
893 }
894
895 if (was_opened)
896 rndis_filter_open(nvdev);
897
898 /* We may have missed link change notifications */
899 net_device_ctx->last_reconfig = 0;
900 schedule_delayed_work(&net_device_ctx->dwork, 0);
901
902 return ret;
903 }
904
905 static bool
906 netvsc_validate_ethtool_ss_cmd(const struct ethtool_link_ksettings *cmd)
907 {
908 struct ethtool_link_ksettings diff1 = *cmd;
909 struct ethtool_link_ksettings diff2 = {};
910
911 diff1.base.speed = 0;
912 diff1.base.duplex = 0;
913 /* advertising and cmd are usually set */
914 ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
915 diff1.base.cmd = 0;
916 /* We set port to PORT_OTHER */
917 diff2.base.port = PORT_OTHER;
918
919 return !memcmp(&diff1, &diff2, sizeof(diff1));
920 }
921
922 static void netvsc_init_settings(struct net_device *dev)
923 {
924 struct net_device_context *ndc = netdev_priv(dev);
925
926 ndc->l4_hash = HV_DEFAULT_L4HASH;
927
928 ndc->speed = SPEED_UNKNOWN;
929 ndc->duplex = DUPLEX_FULL;
930 }
931
932 static int netvsc_get_link_ksettings(struct net_device *dev,
933 struct ethtool_link_ksettings *cmd)
934 {
935 struct net_device_context *ndc = netdev_priv(dev);
936
937 cmd->base.speed = ndc->speed;
938 cmd->base.duplex = ndc->duplex;
939 cmd->base.port = PORT_OTHER;
940
941 return 0;
942 }
943
944 static int netvsc_set_link_ksettings(struct net_device *dev,
945 const struct ethtool_link_ksettings *cmd)
946 {
947 struct net_device_context *ndc = netdev_priv(dev);
948 u32 speed;
949
950 speed = cmd->base.speed;
951 if (!ethtool_validate_speed(speed) ||
952 !ethtool_validate_duplex(cmd->base.duplex) ||
953 !netvsc_validate_ethtool_ss_cmd(cmd))
954 return -EINVAL;
955
956 ndc->speed = speed;
957 ndc->duplex = cmd->base.duplex;
958
959 return 0;
960 }
961
962 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
963 {
964 struct net_device_context *ndevctx = netdev_priv(ndev);
965 struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
966 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
967 struct hv_device *hdev = ndevctx->device_ctx;
968 int orig_mtu = ndev->mtu;
969 struct netvsc_device_info device_info;
970 bool was_opened;
971 int ret = 0;
972
973 if (!nvdev || nvdev->destroy)
974 return -ENODEV;
975
976 /* Change MTU of underlying VF netdev first. */
977 if (vf_netdev) {
978 ret = dev_set_mtu(vf_netdev, mtu);
979 if (ret)
980 return ret;
981 }
982
983 netif_device_detach(ndev);
984 was_opened = rndis_filter_opened(nvdev);
985 if (was_opened)
986 rndis_filter_close(nvdev);
987
988 memset(&device_info, 0, sizeof(device_info));
989 device_info.num_chn = nvdev->num_chn;
990 device_info.send_sections = nvdev->send_section_cnt;
991 device_info.send_section_size = nvdev->send_section_size;
992 device_info.recv_sections = nvdev->recv_section_cnt;
993 device_info.recv_section_size = nvdev->recv_section_size;
994
995 rndis_filter_device_remove(hdev, nvdev);
996
997 ndev->mtu = mtu;
998
999 nvdev = rndis_filter_device_add(hdev, &device_info);
1000 if (IS_ERR(nvdev)) {
1001 ret = PTR_ERR(nvdev);
1002
1003 /* Attempt rollback to original MTU */
1004 ndev->mtu = orig_mtu;
1005 nvdev = rndis_filter_device_add(hdev, &device_info);
1006
1007 if (vf_netdev)
1008 dev_set_mtu(vf_netdev, orig_mtu);
1009
1010 if (IS_ERR(nvdev)) {
1011 netdev_err(ndev, "restoring mtu failed: %ld\n",
1012 PTR_ERR(nvdev));
1013 return ret;
1014 }
1015 }
1016
1017 if (was_opened)
1018 rndis_filter_open(nvdev);
1019
1020 netif_device_attach(ndev);
1021
1022 /* We may have missed link change notifications */
1023 schedule_delayed_work(&ndevctx->dwork, 0);
1024
1025 return ret;
1026 }
1027
1028 static void netvsc_get_vf_stats(struct net_device *net,
1029 struct netvsc_vf_pcpu_stats *tot)
1030 {
1031 struct net_device_context *ndev_ctx = netdev_priv(net);
1032 int i;
1033
1034 memset(tot, 0, sizeof(*tot));
1035
1036 for_each_possible_cpu(i) {
1037 const struct netvsc_vf_pcpu_stats *stats
1038 = per_cpu_ptr(ndev_ctx->vf_stats, i);
1039 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1040 unsigned int start;
1041
1042 do {
1043 start = u64_stats_fetch_begin_irq(&stats->syncp);
1044 rx_packets = stats->rx_packets;
1045 tx_packets = stats->tx_packets;
1046 rx_bytes = stats->rx_bytes;
1047 tx_bytes = stats->tx_bytes;
1048 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1049
1050 tot->rx_packets += rx_packets;
1051 tot->tx_packets += tx_packets;
1052 tot->rx_bytes += rx_bytes;
1053 tot->tx_bytes += tx_bytes;
1054 tot->tx_dropped += stats->tx_dropped;
1055 }
1056 }
1057
1058 static void netvsc_get_stats64(struct net_device *net,
1059 struct rtnl_link_stats64 *t)
1060 {
1061 struct net_device_context *ndev_ctx = netdev_priv(net);
1062 struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev);
1063 struct netvsc_vf_pcpu_stats vf_tot;
1064 int i;
1065
1066 if (!nvdev)
1067 return;
1068
1069 netdev_stats_to_stats64(t, &net->stats);
1070
1071 netvsc_get_vf_stats(net, &vf_tot);
1072 t->rx_packets += vf_tot.rx_packets;
1073 t->tx_packets += vf_tot.tx_packets;
1074 t->rx_bytes += vf_tot.rx_bytes;
1075 t->tx_bytes += vf_tot.tx_bytes;
1076 t->tx_dropped += vf_tot.tx_dropped;
1077
1078 for (i = 0; i < nvdev->num_chn; i++) {
1079 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1080 const struct netvsc_stats *stats;
1081 u64 packets, bytes, multicast;
1082 unsigned int start;
1083
1084 stats = &nvchan->tx_stats;
1085 do {
1086 start = u64_stats_fetch_begin_irq(&stats->syncp);
1087 packets = stats->packets;
1088 bytes = stats->bytes;
1089 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1090
1091 t->tx_bytes += bytes;
1092 t->tx_packets += packets;
1093
1094 stats = &nvchan->rx_stats;
1095 do {
1096 start = u64_stats_fetch_begin_irq(&stats->syncp);
1097 packets = stats->packets;
1098 bytes = stats->bytes;
1099 multicast = stats->multicast + stats->broadcast;
1100 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1101
1102 t->rx_bytes += bytes;
1103 t->rx_packets += packets;
1104 t->multicast += multicast;
1105 }
1106 }
1107
1108 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
1109 {
1110 struct net_device_context *ndc = netdev_priv(ndev);
1111 struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
1112 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1113 struct sockaddr *addr = p;
1114 int err;
1115
1116 err = eth_prepare_mac_addr_change(ndev, p);
1117 if (err)
1118 return err;
1119
1120 if (!nvdev)
1121 return -ENODEV;
1122
1123 if (vf_netdev) {
1124 err = dev_set_mac_address(vf_netdev, addr);
1125 if (err)
1126 return err;
1127 }
1128
1129 err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
1130 if (!err) {
1131 eth_commit_mac_addr_change(ndev, p);
1132 } else if (vf_netdev) {
1133 /* rollback change on VF */
1134 memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
1135 dev_set_mac_address(vf_netdev, addr);
1136 }
1137
1138 return err;
1139 }
1140
1141 static const struct {
1142 char name[ETH_GSTRING_LEN];
1143 u16 offset;
1144 } netvsc_stats[] = {
1145 { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
1146 { "tx_no_memory", offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
1147 { "tx_no_space", offsetof(struct netvsc_ethtool_stats, tx_no_space) },
1148 { "tx_too_big", offsetof(struct netvsc_ethtool_stats, tx_too_big) },
1149 { "tx_busy", offsetof(struct netvsc_ethtool_stats, tx_busy) },
1150 { "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },
1151 { "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },
1152 { "rx_no_memory", offsetof(struct netvsc_ethtool_stats, rx_no_memory) },
1153 { "stop_queue", offsetof(struct netvsc_ethtool_stats, stop_queue) },
1154 { "wake_queue", offsetof(struct netvsc_ethtool_stats, wake_queue) },
1155 }, vf_stats[] = {
1156 { "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },
1157 { "vf_rx_bytes", offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },
1158 { "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },
1159 { "vf_tx_bytes", offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },
1160 { "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },
1161 };
1162
1163 #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats)
1164 #define NETVSC_VF_STATS_LEN ARRAY_SIZE(vf_stats)
1165
1166 /* 4 statistics per queue (rx/tx packets/bytes) */
1167 #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4)
1168
1169 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
1170 {
1171 struct net_device_context *ndc = netdev_priv(dev);
1172 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1173
1174 if (!nvdev)
1175 return -ENODEV;
1176
1177 switch (string_set) {
1178 case ETH_SS_STATS:
1179 return NETVSC_GLOBAL_STATS_LEN
1180 + NETVSC_VF_STATS_LEN
1181 + NETVSC_QUEUE_STATS_LEN(nvdev);
1182 default:
1183 return -EINVAL;
1184 }
1185 }
1186
1187 static void netvsc_get_ethtool_stats(struct net_device *dev,
1188 struct ethtool_stats *stats, u64 *data)
1189 {
1190 struct net_device_context *ndc = netdev_priv(dev);
1191 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1192 const void *nds = &ndc->eth_stats;
1193 const struct netvsc_stats *qstats;
1194 struct netvsc_vf_pcpu_stats sum;
1195 unsigned int start;
1196 u64 packets, bytes;
1197 int i, j;
1198
1199 if (!nvdev)
1200 return;
1201
1202 for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
1203 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1204
1205 netvsc_get_vf_stats(dev, &sum);
1206 for (j = 0; j < NETVSC_VF_STATS_LEN; j++)
1207 data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);
1208
1209 for (j = 0; j < nvdev->num_chn; j++) {
1210 qstats = &nvdev->chan_table[j].tx_stats;
1211
1212 do {
1213 start = u64_stats_fetch_begin_irq(&qstats->syncp);
1214 packets = qstats->packets;
1215 bytes = qstats->bytes;
1216 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1217 data[i++] = packets;
1218 data[i++] = bytes;
1219
1220 qstats = &nvdev->chan_table[j].rx_stats;
1221 do {
1222 start = u64_stats_fetch_begin_irq(&qstats->syncp);
1223 packets = qstats->packets;
1224 bytes = qstats->bytes;
1225 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1226 data[i++] = packets;
1227 data[i++] = bytes;
1228 }
1229 }
1230
1231 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1232 {
1233 struct net_device_context *ndc = netdev_priv(dev);
1234 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1235 u8 *p = data;
1236 int i;
1237
1238 if (!nvdev)
1239 return;
1240
1241 switch (stringset) {
1242 case ETH_SS_STATS:
1243 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) {
1244 memcpy(p, netvsc_stats[i].name, ETH_GSTRING_LEN);
1245 p += ETH_GSTRING_LEN;
1246 }
1247
1248 for (i = 0; i < ARRAY_SIZE(vf_stats); i++) {
1249 memcpy(p, vf_stats[i].name, ETH_GSTRING_LEN);
1250 p += ETH_GSTRING_LEN;
1251 }
1252
1253 for (i = 0; i < nvdev->num_chn; i++) {
1254 sprintf(p, "tx_queue_%u_packets", i);
1255 p += ETH_GSTRING_LEN;
1256 sprintf(p, "tx_queue_%u_bytes", i);
1257 p += ETH_GSTRING_LEN;
1258 sprintf(p, "rx_queue_%u_packets", i);
1259 p += ETH_GSTRING_LEN;
1260 sprintf(p, "rx_queue_%u_bytes", i);
1261 p += ETH_GSTRING_LEN;
1262 }
1263
1264 break;
1265 }
1266 }
1267
1268 static int
1269 netvsc_get_rss_hash_opts(struct net_device_context *ndc,
1270 struct ethtool_rxnfc *info)
1271 {
1272 const u32 l4_flag = RXH_L4_B_0_1 | RXH_L4_B_2_3;
1273
1274 info->data = RXH_IP_SRC | RXH_IP_DST;
1275
1276 switch (info->flow_type) {
1277 case TCP_V4_FLOW:
1278 if (ndc->l4_hash & HV_TCP4_L4HASH)
1279 info->data |= l4_flag;
1280
1281 break;
1282
1283 case TCP_V6_FLOW:
1284 if (ndc->l4_hash & HV_TCP6_L4HASH)
1285 info->data |= l4_flag;
1286
1287 break;
1288
1289 case UDP_V4_FLOW:
1290 if (ndc->l4_hash & HV_UDP4_L4HASH)
1291 info->data |= l4_flag;
1292
1293 break;
1294
1295 case UDP_V6_FLOW:
1296 if (ndc->l4_hash & HV_UDP6_L4HASH)
1297 info->data |= l4_flag;
1298
1299 break;
1300
1301 case IPV4_FLOW:
1302 case IPV6_FLOW:
1303 break;
1304 default:
1305 info->data = 0;
1306 break;
1307 }
1308
1309 return 0;
1310 }
1311
1312 static int
1313 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1314 u32 *rules)
1315 {
1316 struct net_device_context *ndc = netdev_priv(dev);
1317 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1318
1319 if (!nvdev)
1320 return -ENODEV;
1321
1322 switch (info->cmd) {
1323 case ETHTOOL_GRXRINGS:
1324 info->data = nvdev->num_chn;
1325 return 0;
1326
1327 case ETHTOOL_GRXFH:
1328 return netvsc_get_rss_hash_opts(ndc, info);
1329 }
1330 return -EOPNOTSUPP;
1331 }
1332
1333 static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
1334 struct ethtool_rxnfc *info)
1335 {
1336 if (info->data == (RXH_IP_SRC | RXH_IP_DST |
1337 RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
1338 switch (info->flow_type) {
1339 case TCP_V4_FLOW:
1340 ndc->l4_hash |= HV_TCP4_L4HASH;
1341 break;
1342
1343 case TCP_V6_FLOW:
1344 ndc->l4_hash |= HV_TCP6_L4HASH;
1345 break;
1346
1347 case UDP_V4_FLOW:
1348 ndc->l4_hash |= HV_UDP4_L4HASH;
1349 break;
1350
1351 case UDP_V6_FLOW:
1352 ndc->l4_hash |= HV_UDP6_L4HASH;
1353 break;
1354
1355 default:
1356 return -EOPNOTSUPP;
1357 }
1358
1359 return 0;
1360 }
1361
1362 if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {
1363 switch (info->flow_type) {
1364 case TCP_V4_FLOW:
1365 ndc->l4_hash &= ~HV_TCP4_L4HASH;
1366 break;
1367
1368 case TCP_V6_FLOW:
1369 ndc->l4_hash &= ~HV_TCP6_L4HASH;
1370 break;
1371
1372 case UDP_V4_FLOW:
1373 ndc->l4_hash &= ~HV_UDP4_L4HASH;
1374 break;
1375
1376 case UDP_V6_FLOW:
1377 ndc->l4_hash &= ~HV_UDP6_L4HASH;
1378 break;
1379
1380 default:
1381 return -EOPNOTSUPP;
1382 }
1383
1384 return 0;
1385 }
1386
1387 return -EOPNOTSUPP;
1388 }
1389
1390 static int
1391 netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
1392 {
1393 struct net_device_context *ndc = netdev_priv(ndev);
1394
1395 if (info->cmd == ETHTOOL_SRXFH)
1396 return netvsc_set_rss_hash_opts(ndc, info);
1397
1398 return -EOPNOTSUPP;
1399 }
1400
1401 #ifdef CONFIG_NET_POLL_CONTROLLER
1402 static void netvsc_poll_controller(struct net_device *dev)
1403 {
1404 struct net_device_context *ndc = netdev_priv(dev);
1405 struct netvsc_device *ndev;
1406 int i;
1407
1408 rcu_read_lock();
1409 ndev = rcu_dereference(ndc->nvdev);
1410 if (ndev) {
1411 for (i = 0; i < ndev->num_chn; i++) {
1412 struct netvsc_channel *nvchan = &ndev->chan_table[i];
1413
1414 napi_schedule(&nvchan->napi);
1415 }
1416 }
1417 rcu_read_unlock();
1418 }
1419 #endif
1420
1421 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1422 {
1423 return NETVSC_HASH_KEYLEN;
1424 }
1425
1426 static u32 netvsc_rss_indir_size(struct net_device *dev)
1427 {
1428 return ITAB_NUM;
1429 }
1430
1431 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1432 u8 *hfunc)
1433 {
1434 struct net_device_context *ndc = netdev_priv(dev);
1435 struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1436 struct rndis_device *rndis_dev;
1437 int i;
1438
1439 if (!ndev)
1440 return -ENODEV;
1441
1442 if (hfunc)
1443 *hfunc = ETH_RSS_HASH_TOP; /* Toeplitz */
1444
1445 rndis_dev = ndev->extension;
1446 if (indir) {
1447 for (i = 0; i < ITAB_NUM; i++)
1448 indir[i] = rndis_dev->rx_table[i];
1449 }
1450
1451 if (key)
1452 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1453
1454 return 0;
1455 }
1456
1457 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1458 const u8 *key, const u8 hfunc)
1459 {
1460 struct net_device_context *ndc = netdev_priv(dev);
1461 struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1462 struct rndis_device *rndis_dev;
1463 int i;
1464
1465 if (!ndev)
1466 return -ENODEV;
1467
1468 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1469 return -EOPNOTSUPP;
1470
1471 rndis_dev = ndev->extension;
1472 if (indir) {
1473 for (i = 0; i < ITAB_NUM; i++)
1474 if (indir[i] >= ndev->num_chn)
1475 return -EINVAL;
1476
1477 for (i = 0; i < ITAB_NUM; i++)
1478 rndis_dev->rx_table[i] = indir[i];
1479 }
1480
1481 if (!key) {
1482 if (!indir)
1483 return 0;
1484
1485 key = rndis_dev->rss_key;
1486 }
1487
1488 return rndis_filter_set_rss_param(rndis_dev, key);
1489 }
1490
1491 /* Hyper-V RNDIS protocol does not have ring in the HW sense.
1492 * It does have pre-allocated receive area which is divided into sections.
1493 */
1494 static void __netvsc_get_ringparam(struct netvsc_device *nvdev,
1495 struct ethtool_ringparam *ring)
1496 {
1497 u32 max_buf_size;
1498
1499 ring->rx_pending = nvdev->recv_section_cnt;
1500 ring->tx_pending = nvdev->send_section_cnt;
1501
1502 if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
1503 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
1504 else
1505 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
1506
1507 ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;
1508 ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE
1509 / nvdev->send_section_size;
1510 }
1511
1512 static void netvsc_get_ringparam(struct net_device *ndev,
1513 struct ethtool_ringparam *ring)
1514 {
1515 struct net_device_context *ndevctx = netdev_priv(ndev);
1516 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1517
1518 if (!nvdev)
1519 return;
1520
1521 __netvsc_get_ringparam(nvdev, ring);
1522 }
1523
1524 static int netvsc_set_ringparam(struct net_device *ndev,
1525 struct ethtool_ringparam *ring)
1526 {
1527 struct net_device_context *ndevctx = netdev_priv(ndev);
1528 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1529 struct hv_device *hdev = ndevctx->device_ctx;
1530 struct netvsc_device_info device_info;
1531 struct ethtool_ringparam orig;
1532 u32 new_tx, new_rx;
1533 bool was_opened;
1534 int ret = 0;
1535
1536 if (!nvdev || nvdev->destroy)
1537 return -ENODEV;
1538
1539 memset(&orig, 0, sizeof(orig));
1540 __netvsc_get_ringparam(nvdev, &orig);
1541
1542 new_tx = clamp_t(u32, ring->tx_pending,
1543 NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);
1544 new_rx = clamp_t(u32, ring->rx_pending,
1545 NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);
1546
1547 if (new_tx == orig.tx_pending &&
1548 new_rx == orig.rx_pending)
1549 return 0; /* no change */
1550
1551 memset(&device_info, 0, sizeof(device_info));
1552 device_info.num_chn = nvdev->num_chn;
1553 device_info.send_sections = new_tx;
1554 device_info.send_section_size = nvdev->send_section_size;
1555 device_info.recv_sections = new_rx;
1556 device_info.recv_section_size = nvdev->recv_section_size;
1557
1558 netif_device_detach(ndev);
1559 was_opened = rndis_filter_opened(nvdev);
1560 if (was_opened)
1561 rndis_filter_close(nvdev);
1562
1563 rndis_filter_device_remove(hdev, nvdev);
1564
1565 nvdev = rndis_filter_device_add(hdev, &device_info);
1566 if (IS_ERR(nvdev)) {
1567 ret = PTR_ERR(nvdev);
1568
1569 device_info.send_sections = orig.tx_pending;
1570 device_info.recv_sections = orig.rx_pending;
1571 nvdev = rndis_filter_device_add(hdev, &device_info);
1572 if (IS_ERR(nvdev)) {
1573 netdev_err(ndev, "restoring ringparam failed: %ld\n",
1574 PTR_ERR(nvdev));
1575 return ret;
1576 }
1577 }
1578
1579 if (was_opened)
1580 rndis_filter_open(nvdev);
1581 netif_device_attach(ndev);
1582
1583 /* We may have missed link change notifications */
1584 ndevctx->last_reconfig = 0;
1585 schedule_delayed_work(&ndevctx->dwork, 0);
1586
1587 return ret;
1588 }
1589
1590 static const struct ethtool_ops ethtool_ops = {
1591 .get_drvinfo = netvsc_get_drvinfo,
1592 .get_link = ethtool_op_get_link,
1593 .get_ethtool_stats = netvsc_get_ethtool_stats,
1594 .get_sset_count = netvsc_get_sset_count,
1595 .get_strings = netvsc_get_strings,
1596 .get_channels = netvsc_get_channels,
1597 .set_channels = netvsc_set_channels,
1598 .get_ts_info = ethtool_op_get_ts_info,
1599 .get_rxnfc = netvsc_get_rxnfc,
1600 .set_rxnfc = netvsc_set_rxnfc,
1601 .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1602 .get_rxfh_indir_size = netvsc_rss_indir_size,
1603 .get_rxfh = netvsc_get_rxfh,
1604 .set_rxfh = netvsc_set_rxfh,
1605 .get_link_ksettings = netvsc_get_link_ksettings,
1606 .set_link_ksettings = netvsc_set_link_ksettings,
1607 .get_ringparam = netvsc_get_ringparam,
1608 .set_ringparam = netvsc_set_ringparam,
1609 };
1610
1611 static const struct net_device_ops device_ops = {
1612 .ndo_open = netvsc_open,
1613 .ndo_stop = netvsc_close,
1614 .ndo_start_xmit = netvsc_start_xmit,
1615 .ndo_change_rx_flags = netvsc_change_rx_flags,
1616 .ndo_set_rx_mode = netvsc_set_rx_mode,
1617 .ndo_change_mtu = netvsc_change_mtu,
1618 .ndo_validate_addr = eth_validate_addr,
1619 .ndo_set_mac_address = netvsc_set_mac_addr,
1620 .ndo_select_queue = netvsc_select_queue,
1621 .ndo_get_stats64 = netvsc_get_stats64,
1622 #ifdef CONFIG_NET_POLL_CONTROLLER
1623 .ndo_poll_controller = netvsc_poll_controller,
1624 #endif
1625 };
1626
1627 /*
1628 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1629 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1630 * present send GARP packet to network peers with netif_notify_peers().
1631 */
1632 static void netvsc_link_change(struct work_struct *w)
1633 {
1634 struct net_device_context *ndev_ctx =
1635 container_of(w, struct net_device_context, dwork.work);
1636 struct hv_device *device_obj = ndev_ctx->device_ctx;
1637 struct net_device *net = hv_get_drvdata(device_obj);
1638 struct netvsc_device *net_device;
1639 struct rndis_device *rdev;
1640 struct netvsc_reconfig *event = NULL;
1641 bool notify = false, reschedule = false;
1642 unsigned long flags, next_reconfig, delay;
1643
1644 /* if changes are happening, comeback later */
1645 if (!rtnl_trylock()) {
1646 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1647 return;
1648 }
1649
1650 net_device = rtnl_dereference(ndev_ctx->nvdev);
1651 if (!net_device)
1652 goto out_unlock;
1653
1654 rdev = net_device->extension;
1655
1656 next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1657 if (time_is_after_jiffies(next_reconfig)) {
1658 /* link_watch only sends one notification with current state
1659 * per second, avoid doing reconfig more frequently. Handle
1660 * wrap around.
1661 */
1662 delay = next_reconfig - jiffies;
1663 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1664 schedule_delayed_work(&ndev_ctx->dwork, delay);
1665 goto out_unlock;
1666 }
1667 ndev_ctx->last_reconfig = jiffies;
1668
1669 spin_lock_irqsave(&ndev_ctx->lock, flags);
1670 if (!list_empty(&ndev_ctx->reconfig_events)) {
1671 event = list_first_entry(&ndev_ctx->reconfig_events,
1672 struct netvsc_reconfig, list);
1673 list_del(&event->list);
1674 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1675 }
1676 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1677
1678 if (!event)
1679 goto out_unlock;
1680
1681 switch (event->event) {
1682 /* Only the following events are possible due to the check in
1683 * netvsc_linkstatus_callback()
1684 */
1685 case RNDIS_STATUS_MEDIA_CONNECT:
1686 if (rdev->link_state) {
1687 rdev->link_state = false;
1688 netif_carrier_on(net);
1689 netif_tx_wake_all_queues(net);
1690 } else {
1691 notify = true;
1692 }
1693 kfree(event);
1694 break;
1695 case RNDIS_STATUS_MEDIA_DISCONNECT:
1696 if (!rdev->link_state) {
1697 rdev->link_state = true;
1698 netif_carrier_off(net);
1699 netif_tx_stop_all_queues(net);
1700 }
1701 kfree(event);
1702 break;
1703 case RNDIS_STATUS_NETWORK_CHANGE:
1704 /* Only makes sense if carrier is present */
1705 if (!rdev->link_state) {
1706 rdev->link_state = true;
1707 netif_carrier_off(net);
1708 netif_tx_stop_all_queues(net);
1709 event->event = RNDIS_STATUS_MEDIA_CONNECT;
1710 spin_lock_irqsave(&ndev_ctx->lock, flags);
1711 list_add(&event->list, &ndev_ctx->reconfig_events);
1712 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1713 reschedule = true;
1714 }
1715 break;
1716 }
1717
1718 rtnl_unlock();
1719
1720 if (notify)
1721 netdev_notify_peers(net);
1722
1723 /* link_watch only sends one notification with current state per
1724 * second, handle next reconfig event in 2 seconds.
1725 */
1726 if (reschedule)
1727 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1728
1729 return;
1730
1731 out_unlock:
1732 rtnl_unlock();
1733 }
1734
1735 static struct net_device *get_netvsc_bymac(const u8 *mac)
1736 {
1737 struct net_device *dev;
1738
1739 ASSERT_RTNL();
1740
1741 for_each_netdev(&init_net, dev) {
1742 if (dev->netdev_ops != &device_ops)
1743 continue; /* not a netvsc device */
1744
1745 if (ether_addr_equal(mac, dev->perm_addr))
1746 return dev;
1747 }
1748
1749 return NULL;
1750 }
1751
1752 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1753 {
1754 struct net_device *dev;
1755
1756 ASSERT_RTNL();
1757
1758 for_each_netdev(&init_net, dev) {
1759 struct net_device_context *net_device_ctx;
1760
1761 if (dev->netdev_ops != &device_ops)
1762 continue; /* not a netvsc device */
1763
1764 net_device_ctx = netdev_priv(dev);
1765 if (!rtnl_dereference(net_device_ctx->nvdev))
1766 continue; /* device is removed */
1767
1768 if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev)
1769 return dev; /* a match */
1770 }
1771
1772 return NULL;
1773 }
1774
1775 /* Called when VF is injecting data into network stack.
1776 * Change the associated network device from VF to netvsc.
1777 * note: already called with rcu_read_lock
1778 */
1779 static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
1780 {
1781 struct sk_buff *skb = *pskb;
1782 struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);
1783 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1784 struct netvsc_vf_pcpu_stats *pcpu_stats
1785 = this_cpu_ptr(ndev_ctx->vf_stats);
1786
1787 skb->dev = ndev;
1788
1789 u64_stats_update_begin(&pcpu_stats->syncp);
1790 pcpu_stats->rx_packets++;
1791 pcpu_stats->rx_bytes += skb->len;
1792 u64_stats_update_end(&pcpu_stats->syncp);
1793
1794 return RX_HANDLER_ANOTHER;
1795 }
1796
1797 static int netvsc_vf_join(struct net_device *vf_netdev,
1798 struct net_device *ndev)
1799 {
1800 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1801 int ret;
1802
1803 ret = netdev_rx_handler_register(vf_netdev,
1804 netvsc_vf_handle_frame, ndev);
1805 if (ret != 0) {
1806 netdev_err(vf_netdev,
1807 "can not register netvsc VF receive handler (err = %d)\n",
1808 ret);
1809 goto rx_handler_failed;
1810 }
1811
1812 ret = netdev_upper_dev_link(vf_netdev, ndev, NULL);
1813 if (ret != 0) {
1814 netdev_err(vf_netdev,
1815 "can not set master device %s (err = %d)\n",
1816 ndev->name, ret);
1817 goto upper_link_failed;
1818 }
1819
1820 /* set slave flag before open to prevent IPv6 addrconf */
1821 vf_netdev->flags |= IFF_SLAVE;
1822
1823 schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
1824
1825 call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
1826
1827 netdev_info(vf_netdev, "joined to %s\n", ndev->name);
1828 return 0;
1829
1830 upper_link_failed:
1831 netdev_rx_handler_unregister(vf_netdev);
1832 rx_handler_failed:
1833 return ret;
1834 }
1835
1836 static void __netvsc_vf_setup(struct net_device *ndev,
1837 struct net_device *vf_netdev)
1838 {
1839 int ret;
1840
1841 /* Align MTU of VF with master */
1842 ret = dev_set_mtu(vf_netdev, ndev->mtu);
1843 if (ret)
1844 netdev_warn(vf_netdev,
1845 "unable to change mtu to %u\n", ndev->mtu);
1846
1847 /* set multicast etc flags on VF */
1848 dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE);
1849 dev_uc_sync(vf_netdev, ndev);
1850 dev_mc_sync(vf_netdev, ndev);
1851
1852 if (netif_running(ndev)) {
1853 ret = dev_open(vf_netdev);
1854 if (ret)
1855 netdev_warn(vf_netdev,
1856 "unable to open: %d\n", ret);
1857 }
1858 }
1859
1860 /* Setup VF as slave of the synthetic device.
1861 * Runs in workqueue to avoid recursion in netlink callbacks.
1862 */
1863 static void netvsc_vf_setup(struct work_struct *w)
1864 {
1865 struct net_device_context *ndev_ctx
1866 = container_of(w, struct net_device_context, vf_takeover.work);
1867 struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
1868 struct net_device *vf_netdev;
1869
1870 if (!rtnl_trylock()) {
1871 schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
1872 return;
1873 }
1874
1875 vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
1876 if (vf_netdev)
1877 __netvsc_vf_setup(ndev, vf_netdev);
1878
1879 rtnl_unlock();
1880 }
1881
1882 static int netvsc_register_vf(struct net_device *vf_netdev)
1883 {
1884 struct net_device *ndev;
1885 struct net_device_context *net_device_ctx;
1886 struct netvsc_device *netvsc_dev;
1887
1888 if (vf_netdev->addr_len != ETH_ALEN)
1889 return NOTIFY_DONE;
1890
1891 /*
1892 * We will use the MAC address to locate the synthetic interface to
1893 * associate with the VF interface. If we don't find a matching
1894 * synthetic interface, move on.
1895 */
1896 ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1897 if (!ndev)
1898 return NOTIFY_DONE;
1899
1900 net_device_ctx = netdev_priv(ndev);
1901 netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1902 if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1903 return NOTIFY_DONE;
1904
1905 if (netvsc_vf_join(vf_netdev, ndev) != 0)
1906 return NOTIFY_DONE;
1907
1908 netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1909
1910 dev_hold(vf_netdev);
1911 rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1912 return NOTIFY_OK;
1913 }
1914
1915 /* VF up/down change detected, schedule to change data path */
1916 static int netvsc_vf_changed(struct net_device *vf_netdev)
1917 {
1918 struct net_device_context *net_device_ctx;
1919 struct netvsc_device *netvsc_dev;
1920 struct net_device *ndev;
1921 bool vf_is_up = netif_running(vf_netdev);
1922
1923 ndev = get_netvsc_byref(vf_netdev);
1924 if (!ndev)
1925 return NOTIFY_DONE;
1926
1927 net_device_ctx = netdev_priv(ndev);
1928 netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1929 if (!netvsc_dev)
1930 return NOTIFY_DONE;
1931
1932 netvsc_switch_datapath(ndev, vf_is_up);
1933 netdev_info(ndev, "Data path switched %s VF: %s\n",
1934 vf_is_up ? "to" : "from", vf_netdev->name);
1935
1936 return NOTIFY_OK;
1937 }
1938
1939 static int netvsc_unregister_vf(struct net_device *vf_netdev)
1940 {
1941 struct net_device *ndev;
1942 struct net_device_context *net_device_ctx;
1943
1944 ndev = get_netvsc_byref(vf_netdev);
1945 if (!ndev)
1946 return NOTIFY_DONE;
1947
1948 net_device_ctx = netdev_priv(ndev);
1949 cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
1950
1951 netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
1952
1953 netdev_rx_handler_unregister(vf_netdev);
1954 netdev_upper_dev_unlink(vf_netdev, ndev);
1955 RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
1956 dev_put(vf_netdev);
1957
1958 return NOTIFY_OK;
1959 }
1960
1961 static int netvsc_probe(struct hv_device *dev,
1962 const struct hv_vmbus_device_id *dev_id)
1963 {
1964 struct net_device *net = NULL;
1965 struct net_device_context *net_device_ctx;
1966 struct netvsc_device_info device_info;
1967 struct netvsc_device *nvdev;
1968 int ret = -ENOMEM;
1969
1970 net = alloc_etherdev_mq(sizeof(struct net_device_context),
1971 VRSS_CHANNEL_MAX);
1972 if (!net)
1973 goto no_net;
1974
1975 netif_carrier_off(net);
1976
1977 netvsc_init_settings(net);
1978
1979 net_device_ctx = netdev_priv(net);
1980 net_device_ctx->device_ctx = dev;
1981 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1982 if (netif_msg_probe(net_device_ctx))
1983 netdev_dbg(net, "netvsc msg_enable: %d\n",
1984 net_device_ctx->msg_enable);
1985
1986 hv_set_drvdata(dev, net);
1987
1988 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1989
1990 spin_lock_init(&net_device_ctx->lock);
1991 INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1992 INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
1993
1994 net_device_ctx->vf_stats
1995 = netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
1996 if (!net_device_ctx->vf_stats)
1997 goto no_stats;
1998
1999 net->netdev_ops = &device_ops;
2000 net->ethtool_ops = &ethtool_ops;
2001 SET_NETDEV_DEV(net, &dev->device);
2002
2003 /* We always need headroom for rndis header */
2004 net->needed_headroom = RNDIS_AND_PPI_SIZE;
2005
2006 /* Initialize the number of queues to be 1, we may change it if more
2007 * channels are offered later.
2008 */
2009 netif_set_real_num_tx_queues(net, 1);
2010 netif_set_real_num_rx_queues(net, 1);
2011
2012 /* Notify the netvsc driver of the new device */
2013 memset(&device_info, 0, sizeof(device_info));
2014 device_info.num_chn = VRSS_CHANNEL_DEFAULT;
2015 device_info.send_sections = NETVSC_DEFAULT_TX;
2016 device_info.send_section_size = NETVSC_SEND_SECTION_SIZE;
2017 device_info.recv_sections = NETVSC_DEFAULT_RX;
2018 device_info.recv_section_size = NETVSC_RECV_SECTION_SIZE;
2019
2020 nvdev = rndis_filter_device_add(dev, &device_info);
2021 if (IS_ERR(nvdev)) {
2022 ret = PTR_ERR(nvdev);
2023 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
2024 goto rndis_failed;
2025 }
2026
2027 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
2028
2029 /* hw_features computed in rndis_netdev_set_hwcaps() */
2030 net->features = net->hw_features |
2031 NETIF_F_HIGHDMA | NETIF_F_SG |
2032 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2033 net->vlan_features = net->features;
2034
2035 netdev_lockdep_set_classes(net);
2036
2037 /* MTU range: 68 - 1500 or 65521 */
2038 net->min_mtu = NETVSC_MTU_MIN;
2039 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
2040 net->max_mtu = NETVSC_MTU - ETH_HLEN;
2041 else
2042 net->max_mtu = ETH_DATA_LEN;
2043
2044 ret = register_netdev(net);
2045 if (ret != 0) {
2046 pr_err("Unable to register netdev.\n");
2047 goto register_failed;
2048 }
2049
2050 return ret;
2051
2052 register_failed:
2053 rndis_filter_device_remove(dev, nvdev);
2054 rndis_failed:
2055 free_percpu(net_device_ctx->vf_stats);
2056 no_stats:
2057 hv_set_drvdata(dev, NULL);
2058 free_netdev(net);
2059 no_net:
2060 return ret;
2061 }
2062
2063 static int netvsc_remove(struct hv_device *dev)
2064 {
2065 struct net_device_context *ndev_ctx;
2066 struct net_device *vf_netdev;
2067 struct net_device *net;
2068
2069 net = hv_get_drvdata(dev);
2070 if (net == NULL) {
2071 dev_err(&dev->device, "No net device to remove\n");
2072 return 0;
2073 }
2074
2075 ndev_ctx = netdev_priv(net);
2076
2077 netif_device_detach(net);
2078
2079 cancel_delayed_work_sync(&ndev_ctx->dwork);
2080
2081 /*
2082 * Call to the vsc driver to let it know that the device is being
2083 * removed. Also blocks mtu and channel changes.
2084 */
2085 rtnl_lock();
2086 vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
2087 if (vf_netdev)
2088 netvsc_unregister_vf(vf_netdev);
2089
2090 unregister_netdevice(net);
2091
2092 rndis_filter_device_remove(dev,
2093 rtnl_dereference(ndev_ctx->nvdev));
2094 rtnl_unlock();
2095
2096 hv_set_drvdata(dev, NULL);
2097
2098 free_percpu(ndev_ctx->vf_stats);
2099 free_netdev(net);
2100 return 0;
2101 }
2102
2103 static const struct hv_vmbus_device_id id_table[] = {
2104 /* Network guid */
2105 { HV_NIC_GUID, },
2106 { },
2107 };
2108
2109 MODULE_DEVICE_TABLE(vmbus, id_table);
2110
2111 /* The one and only one */
2112 static struct hv_driver netvsc_drv = {
2113 .name = KBUILD_MODNAME,
2114 .id_table = id_table,
2115 .probe = netvsc_probe,
2116 .remove = netvsc_remove,
2117 };
2118
2119 /*
2120 * On Hyper-V, every VF interface is matched with a corresponding
2121 * synthetic interface. The synthetic interface is presented first
2122 * to the guest. When the corresponding VF instance is registered,
2123 * we will take care of switching the data path.
2124 */
2125 static int netvsc_netdev_event(struct notifier_block *this,
2126 unsigned long event, void *ptr)
2127 {
2128 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2129
2130 /* Skip our own events */
2131 if (event_dev->netdev_ops == &device_ops)
2132 return NOTIFY_DONE;
2133
2134 /* Avoid non-Ethernet type devices */
2135 if (event_dev->type != ARPHRD_ETHER)
2136 return NOTIFY_DONE;
2137
2138 /* Avoid Vlan dev with same MAC registering as VF */
2139 if (is_vlan_dev(event_dev))
2140 return NOTIFY_DONE;
2141
2142 /* Avoid Bonding master dev with same MAC registering as VF */
2143 if ((event_dev->priv_flags & IFF_BONDING) &&
2144 (event_dev->flags & IFF_MASTER))
2145 return NOTIFY_DONE;
2146
2147 switch (event) {
2148 case NETDEV_REGISTER:
2149 return netvsc_register_vf(event_dev);
2150 case NETDEV_UNREGISTER:
2151 return netvsc_unregister_vf(event_dev);
2152 case NETDEV_UP:
2153 case NETDEV_DOWN:
2154 return netvsc_vf_changed(event_dev);
2155 default:
2156 return NOTIFY_DONE;
2157 }
2158 }
2159
2160 static struct notifier_block netvsc_netdev_notifier = {
2161 .notifier_call = netvsc_netdev_event,
2162 };
2163
2164 static void __exit netvsc_drv_exit(void)
2165 {
2166 unregister_netdevice_notifier(&netvsc_netdev_notifier);
2167 vmbus_driver_unregister(&netvsc_drv);
2168 }
2169
2170 static int __init netvsc_drv_init(void)
2171 {
2172 int ret;
2173
2174 if (ring_size < RING_SIZE_MIN) {
2175 ring_size = RING_SIZE_MIN;
2176 pr_info("Increased ring_size to %u (min allowed)\n",
2177 ring_size);
2178 }
2179 netvsc_ring_bytes = ring_size * PAGE_SIZE;
2180 netvsc_ring_reciprocal = reciprocal_value(netvsc_ring_bytes);
2181
2182 ret = vmbus_driver_register(&netvsc_drv);
2183 if (ret)
2184 return ret;
2185
2186 register_netdevice_notifier(&netvsc_netdev_notifier);
2187 return 0;
2188 }
2189
2190 MODULE_LICENSE("GPL");
2191 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
2192
2193 module_init(netvsc_drv_init);
2194 module_exit(netvsc_drv_exit);
CRIS linux kernel tree