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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 <net/arp.h>
37#include <net/route.h>
38#include <net/sock.h>
39#include <net/pkt_sched.h>
40
41#include "hyperv_net.h"
42
43struct net_device_context {
44 /* point back to our device context */
45 struct hv_device *device_ctx;
46 struct delayed_work dwork;
47 struct work_struct work;
48};
49
50#define RING_SIZE_MIN 64
51static int ring_size = 128;
52module_param(ring_size, int, S_IRUGO);
53MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
54
55static void do_set_multicast(struct work_struct *w)
56{
57 struct net_device_context *ndevctx =
58 container_of(w, struct net_device_context, work);
59 struct netvsc_device *nvdev;
60 struct rndis_device *rdev;
61
62 nvdev = hv_get_drvdata(ndevctx->device_ctx);
63 if (nvdev == NULL || nvdev->ndev == NULL)
64 return;
65
66 rdev = nvdev->extension;
67 if (rdev == NULL)
68 return;
69
70 if (nvdev->ndev->flags & IFF_PROMISC)
71 rndis_filter_set_packet_filter(rdev,
72 NDIS_PACKET_TYPE_PROMISCUOUS);
73 else
74 rndis_filter_set_packet_filter(rdev,
75 NDIS_PACKET_TYPE_BROADCAST |
76 NDIS_PACKET_TYPE_ALL_MULTICAST |
77 NDIS_PACKET_TYPE_DIRECTED);
78}
79
80static void netvsc_set_multicast_list(struct net_device *net)
81{
82 struct net_device_context *net_device_ctx = netdev_priv(net);
83
84 schedule_work(&net_device_ctx->work);
85}
86
87static int netvsc_open(struct net_device *net)
88{
89 struct net_device_context *net_device_ctx = netdev_priv(net);
90 struct hv_device *device_obj = net_device_ctx->device_ctx;
91 struct netvsc_device *nvdev;
92 struct rndis_device *rdev;
93 int ret = 0;
94
95 netif_carrier_off(net);
96
97 /* Open up the device */
98 ret = rndis_filter_open(device_obj);
99 if (ret != 0) {
100 netdev_err(net, "unable to open device (ret %d).\n", ret);
101 return ret;
102 }
103
104 netif_start_queue(net);
105
106 nvdev = hv_get_drvdata(device_obj);
107 rdev = nvdev->extension;
108 if (!rdev->link_state)
109 netif_carrier_on(net);
110
111 return ret;
112}
113
114static int netvsc_close(struct net_device *net)
115{
116 struct net_device_context *net_device_ctx = netdev_priv(net);
117 struct hv_device *device_obj = net_device_ctx->device_ctx;
118 int ret;
119
120 netif_tx_disable(net);
121
122 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
123 cancel_work_sync(&net_device_ctx->work);
124 ret = rndis_filter_close(device_obj);
125 if (ret != 0)
126 netdev_err(net, "unable to close device (ret %d).\n", ret);
127
128 return ret;
129}
130
131static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
132 int pkt_type)
133{
134 struct rndis_packet *rndis_pkt;
135 struct rndis_per_packet_info *ppi;
136
137 rndis_pkt = &msg->msg.pkt;
138 rndis_pkt->data_offset += ppi_size;
139
140 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
141 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
142
143 ppi->size = ppi_size;
144 ppi->type = pkt_type;
145 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
146
147 rndis_pkt->per_pkt_info_len += ppi_size;
148
149 return ppi;
150}
151
152static void netvsc_xmit_completion(void *context)
153{
154 struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
155 struct sk_buff *skb = (struct sk_buff *)
156 (unsigned long)packet->completion.send.send_completion_tid;
157
158 kfree(packet);
159
160 if (skb)
161 dev_kfree_skb_any(skb);
162}
163
164static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
165 struct hv_page_buffer *pb)
166{
167 int j = 0;
168
169 /* Deal with compund pages by ignoring unused part
170 * of the page.
171 */
172 page += (offset >> PAGE_SHIFT);
173 offset &= ~PAGE_MASK;
174
175 while (len > 0) {
176 unsigned long bytes;
177
178 bytes = PAGE_SIZE - offset;
179 if (bytes > len)
180 bytes = len;
181 pb[j].pfn = page_to_pfn(page);
182 pb[j].offset = offset;
183 pb[j].len = bytes;
184
185 offset += bytes;
186 len -= bytes;
187
188 if (offset == PAGE_SIZE && len) {
189 page++;
190 offset = 0;
191 j++;
192 }
193 }
194
195 return j + 1;
196}
197
198static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
199 struct hv_page_buffer *pb)
200{
201 u32 slots_used = 0;
202 char *data = skb->data;
203 int frags = skb_shinfo(skb)->nr_frags;
204 int i;
205
206 /* The packet is laid out thus:
207 * 1. hdr
208 * 2. skb linear data
209 * 3. skb fragment data
210 */
211 if (hdr != NULL)
212 slots_used += fill_pg_buf(virt_to_page(hdr),
213 offset_in_page(hdr),
214 len, &pb[slots_used]);
215
216 slots_used += fill_pg_buf(virt_to_page(data),
217 offset_in_page(data),
218 skb_headlen(skb), &pb[slots_used]);
219
220 for (i = 0; i < frags; i++) {
221 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
222
223 slots_used += fill_pg_buf(skb_frag_page(frag),
224 frag->page_offset,
225 skb_frag_size(frag), &pb[slots_used]);
226 }
227 return slots_used;
228}
229
230static int count_skb_frag_slots(struct sk_buff *skb)
231{
232 int i, frags = skb_shinfo(skb)->nr_frags;
233 int pages = 0;
234
235 for (i = 0; i < frags; i++) {
236 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
237 unsigned long size = skb_frag_size(frag);
238 unsigned long offset = frag->page_offset;
239
240 /* Skip unused frames from start of page */
241 offset &= ~PAGE_MASK;
242 pages += PFN_UP(offset + size);
243 }
244 return pages;
245}
246
247static int netvsc_get_slots(struct sk_buff *skb)
248{
249 char *data = skb->data;
250 unsigned int offset = offset_in_page(data);
251 unsigned int len = skb_headlen(skb);
252 int slots;
253 int frag_slots;
254
255 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
256 frag_slots = count_skb_frag_slots(skb);
257 return slots + frag_slots;
258}
259
260static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
261{
262 u32 ret_val = TRANSPORT_INFO_NOT_IP;
263
264 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
265 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
266 goto not_ip;
267 }
268
269 *trans_off = skb_transport_offset(skb);
270
271 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
272 struct iphdr *iphdr = ip_hdr(skb);
273
274 if (iphdr->protocol == IPPROTO_TCP)
275 ret_val = TRANSPORT_INFO_IPV4_TCP;
276 else if (iphdr->protocol == IPPROTO_UDP)
277 ret_val = TRANSPORT_INFO_IPV4_UDP;
278 } else {
279 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
280 ret_val = TRANSPORT_INFO_IPV6_TCP;
281 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
282 ret_val = TRANSPORT_INFO_IPV6_UDP;
283 }
284
285not_ip:
286 return ret_val;
287}
288
289static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
290{
291 struct net_device_context *net_device_ctx = netdev_priv(net);
292 struct hv_netvsc_packet *packet;
293 int ret;
294 unsigned int num_data_pgs;
295 struct rndis_message *rndis_msg;
296 struct rndis_packet *rndis_pkt;
297 u32 rndis_msg_size;
298 bool isvlan;
299 struct rndis_per_packet_info *ppi;
300 struct ndis_tcp_ip_checksum_info *csum_info;
301 struct ndis_tcp_lso_info *lso_info;
302 int hdr_offset;
303 u32 net_trans_info;
304
305
306 /* We will atmost need two pages to describe the rndis
307 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
308 * of pages in a single packet.
309 */
310 num_data_pgs = netvsc_get_slots(skb) + 2;
311 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
312 netdev_err(net, "Packet too big: %u\n", skb->len);
313 dev_kfree_skb(skb);
314 net->stats.tx_dropped++;
315 return NETDEV_TX_OK;
316 }
317
318 /* Allocate a netvsc packet based on # of frags. */
319 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
320 (num_data_pgs * sizeof(struct hv_page_buffer)) +
321 sizeof(struct rndis_message) +
322 NDIS_VLAN_PPI_SIZE +
323 NDIS_CSUM_PPI_SIZE +
324 NDIS_LSO_PPI_SIZE, GFP_ATOMIC);
325 if (!packet) {
326 /* out of memory, drop packet */
327 netdev_err(net, "unable to allocate hv_netvsc_packet\n");
328
329 dev_kfree_skb(skb);
330 net->stats.tx_dropped++;
331 return NETDEV_TX_OK;
332 }
333
334 packet->vlan_tci = skb->vlan_tci;
335
336 packet->is_data_pkt = true;
337 packet->total_data_buflen = skb->len;
338
339 packet->rndis_msg = (struct rndis_message *)((unsigned long)packet +
340 sizeof(struct hv_netvsc_packet) +
341 (num_data_pgs * sizeof(struct hv_page_buffer)));
342
343 /* Set the completion routine */
344 packet->completion.send.send_completion = netvsc_xmit_completion;
345 packet->completion.send.send_completion_ctx = packet;
346 packet->completion.send.send_completion_tid = (unsigned long)skb;
347
348 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT;
349
350 /* Add the rndis header */
351 rndis_msg = packet->rndis_msg;
352 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
353 rndis_msg->msg_len = packet->total_data_buflen;
354 rndis_pkt = &rndis_msg->msg.pkt;
355 rndis_pkt->data_offset = sizeof(struct rndis_packet);
356 rndis_pkt->data_len = packet->total_data_buflen;
357 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
358
359 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
360
361 if (isvlan) {
362 struct ndis_pkt_8021q_info *vlan;
363
364 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
365 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
366 IEEE_8021Q_INFO);
367 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
368 ppi->ppi_offset);
369 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK;
370 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >>
371 VLAN_PRIO_SHIFT;
372 }
373
374 net_trans_info = get_net_transport_info(skb, &hdr_offset);
375 if (net_trans_info == TRANSPORT_INFO_NOT_IP)
376 goto do_send;
377
378 /*
379 * Setup the sendside checksum offload only if this is not a
380 * GSO packet.
381 */
382 if (skb_is_gso(skb))
383 goto do_lso;
384
385 if ((skb->ip_summed == CHECKSUM_NONE) ||
386 (skb->ip_summed == CHECKSUM_UNNECESSARY))
387 goto do_send;
388
389 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
390 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
391 TCPIP_CHKSUM_PKTINFO);
392
393 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
394 ppi->ppi_offset);
395
396 if (net_trans_info & (INFO_IPV4 << 16))
397 csum_info->transmit.is_ipv4 = 1;
398 else
399 csum_info->transmit.is_ipv6 = 1;
400
401 if (net_trans_info & INFO_TCP) {
402 csum_info->transmit.tcp_checksum = 1;
403 csum_info->transmit.tcp_header_offset = hdr_offset;
404 } else if (net_trans_info & INFO_UDP) {
405 /* UDP checksum offload is not supported on ws2008r2.
406 * Furthermore, on ws2012 and ws2012r2, there are some
407 * issues with udp checksum offload from Linux guests.
408 * (these are host issues).
409 * For now compute the checksum here.
410 */
411 struct udphdr *uh;
412 u16 udp_len;
413
414 ret = skb_cow_head(skb, 0);
415 if (ret)
416 goto drop;
417
418 uh = udp_hdr(skb);
419 udp_len = ntohs(uh->len);
420 uh->check = 0;
421 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
422 ip_hdr(skb)->daddr,
423 udp_len, IPPROTO_UDP,
424 csum_partial(uh, udp_len, 0));
425 if (uh->check == 0)
426 uh->check = CSUM_MANGLED_0;
427
428 csum_info->transmit.udp_checksum = 0;
429 }
430 goto do_send;
431
432do_lso:
433 rndis_msg_size += NDIS_LSO_PPI_SIZE;
434 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
435 TCP_LARGESEND_PKTINFO);
436
437 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
438 ppi->ppi_offset);
439
440 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
441 if (net_trans_info & (INFO_IPV4 << 16)) {
442 lso_info->lso_v2_transmit.ip_version =
443 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
444 ip_hdr(skb)->tot_len = 0;
445 ip_hdr(skb)->check = 0;
446 tcp_hdr(skb)->check =
447 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
448 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
449 } else {
450 lso_info->lso_v2_transmit.ip_version =
451 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
452 ipv6_hdr(skb)->payload_len = 0;
453 tcp_hdr(skb)->check =
454 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
455 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
456 }
457 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
458 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
459
460do_send:
461 /* Start filling in the page buffers with the rndis hdr */
462 rndis_msg->msg_len += rndis_msg_size;
463 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
464 skb, &packet->page_buf[0]);
465
466 ret = netvsc_send(net_device_ctx->device_ctx, packet);
467
468drop:
469 if (ret == 0) {
470 net->stats.tx_bytes += skb->len;
471 net->stats.tx_packets++;
472 } else {
473 kfree(packet);
474 if (ret != -EAGAIN) {
475 dev_kfree_skb_any(skb);
476 net->stats.tx_dropped++;
477 }
478 }
479
480 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
481}
482
483/*
484 * netvsc_linkstatus_callback - Link up/down notification
485 */
486void netvsc_linkstatus_callback(struct hv_device *device_obj,
487 unsigned int status)
488{
489 struct net_device *net;
490 struct net_device_context *ndev_ctx;
491 struct netvsc_device *net_device;
492 struct rndis_device *rdev;
493
494 net_device = hv_get_drvdata(device_obj);
495 rdev = net_device->extension;
496
497 rdev->link_state = status != 1;
498
499 net = net_device->ndev;
500
501 if (!net || net->reg_state != NETREG_REGISTERED)
502 return;
503
504 ndev_ctx = netdev_priv(net);
505 if (status == 1) {
506 schedule_delayed_work(&ndev_ctx->dwork, 0);
507 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
508 } else {
509 schedule_delayed_work(&ndev_ctx->dwork, 0);
510 }
511}
512
513/*
514 * netvsc_recv_callback - Callback when we receive a packet from the
515 * "wire" on the specified device.
516 */
517int netvsc_recv_callback(struct hv_device *device_obj,
518 struct hv_netvsc_packet *packet,
519 struct ndis_tcp_ip_checksum_info *csum_info)
520{
521 struct net_device *net;
522 struct sk_buff *skb;
523
524 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
525 if (!net || net->reg_state != NETREG_REGISTERED) {
526 packet->status = NVSP_STAT_FAIL;
527 return 0;
528 }
529
530 /* Allocate a skb - TODO direct I/O to pages? */
531 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
532 if (unlikely(!skb)) {
533 ++net->stats.rx_dropped;
534 packet->status = NVSP_STAT_FAIL;
535 return 0;
536 }
537
538 /*
539 * Copy to skb. This copy is needed here since the memory pointed by
540 * hv_netvsc_packet cannot be deallocated
541 */
542 memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
543 packet->total_data_buflen);
544
545 skb->protocol = eth_type_trans(skb, net);
546 if (csum_info) {
547 /* We only look at the IP checksum here.
548 * Should we be dropping the packet if checksum
549 * failed? How do we deal with other checksums - TCP/UDP?
550 */
551 if (csum_info->receive.ip_checksum_succeeded)
552 skb->ip_summed = CHECKSUM_UNNECESSARY;
553 else
554 skb->ip_summed = CHECKSUM_NONE;
555 }
556
557 if (packet->vlan_tci & VLAN_TAG_PRESENT)
558 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
559 packet->vlan_tci);
560
561 net->stats.rx_packets++;
562 net->stats.rx_bytes += packet->total_data_buflen;
563
564 /*
565 * Pass the skb back up. Network stack will deallocate the skb when it
566 * is done.
567 * TODO - use NAPI?
568 */
569 netif_rx(skb);
570
571 return 0;
572}
573
574static void netvsc_get_drvinfo(struct net_device *net,
575 struct ethtool_drvinfo *info)
576{
577 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
578 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
579}
580
581static int netvsc_change_mtu(struct net_device *ndev, int mtu)
582{
583 struct net_device_context *ndevctx = netdev_priv(ndev);
584 struct hv_device *hdev = ndevctx->device_ctx;
585 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
586 struct netvsc_device_info device_info;
587 int limit = ETH_DATA_LEN;
588
589 if (nvdev == NULL || nvdev->destroy)
590 return -ENODEV;
591
592 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
593 limit = NETVSC_MTU;
594
595 if (mtu < 68 || mtu > limit)
596 return -EINVAL;
597
598 nvdev->start_remove = true;
599 cancel_work_sync(&ndevctx->work);
600 netif_tx_disable(ndev);
601 rndis_filter_device_remove(hdev);
602
603 ndev->mtu = mtu;
604
605 ndevctx->device_ctx = hdev;
606 hv_set_drvdata(hdev, ndev);
607 device_info.ring_size = ring_size;
608 rndis_filter_device_add(hdev, &device_info);
609 netif_wake_queue(ndev);
610
611 return 0;
612}
613
614
615static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
616{
617 struct net_device_context *ndevctx = netdev_priv(ndev);
618 struct hv_device *hdev = ndevctx->device_ctx;
619 struct sockaddr *addr = p;
620 char save_adr[ETH_ALEN];
621 unsigned char save_aatype;
622 int err;
623
624 memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
625 save_aatype = ndev->addr_assign_type;
626
627 err = eth_mac_addr(ndev, p);
628 if (err != 0)
629 return err;
630
631 err = rndis_filter_set_device_mac(hdev, addr->sa_data);
632 if (err != 0) {
633 /* roll back to saved MAC */
634 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
635 ndev->addr_assign_type = save_aatype;
636 }
637
638 return err;
639}
640
641
642static const struct ethtool_ops ethtool_ops = {
643 .get_drvinfo = netvsc_get_drvinfo,
644 .get_link = ethtool_op_get_link,
645};
646
647static const struct net_device_ops device_ops = {
648 .ndo_open = netvsc_open,
649 .ndo_stop = netvsc_close,
650 .ndo_start_xmit = netvsc_start_xmit,
651 .ndo_set_rx_mode = netvsc_set_multicast_list,
652 .ndo_change_mtu = netvsc_change_mtu,
653 .ndo_validate_addr = eth_validate_addr,
654 .ndo_set_mac_address = netvsc_set_mac_addr,
655};
656
657/*
658 * Send GARP packet to network peers after migrations.
659 * After Quick Migration, the network is not immediately operational in the
660 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
661 * another netif_notify_peers() into a delayed work, otherwise GARP packet
662 * will not be sent after quick migration, and cause network disconnection.
663 * Also, we update the carrier status here.
664 */
665static void netvsc_link_change(struct work_struct *w)
666{
667 struct net_device_context *ndev_ctx;
668 struct net_device *net;
669 struct netvsc_device *net_device;
670 struct rndis_device *rdev;
671 bool notify;
672
673 rtnl_lock();
674
675 ndev_ctx = container_of(w, struct net_device_context, dwork.work);
676 net_device = hv_get_drvdata(ndev_ctx->device_ctx);
677 rdev = net_device->extension;
678 net = net_device->ndev;
679
680 if (rdev->link_state) {
681 netif_carrier_off(net);
682 notify = false;
683 } else {
684 netif_carrier_on(net);
685 notify = true;
686 }
687
688 rtnl_unlock();
689
690 if (notify)
691 netdev_notify_peers(net);
692}
693
694
695static int netvsc_probe(struct hv_device *dev,
696 const struct hv_vmbus_device_id *dev_id)
697{
698 struct net_device *net = NULL;
699 struct net_device_context *net_device_ctx;
700 struct netvsc_device_info device_info;
701 int ret;
702
703 net = alloc_etherdev(sizeof(struct net_device_context));
704 if (!net)
705 return -ENOMEM;
706
707 netif_carrier_off(net);
708
709 net_device_ctx = netdev_priv(net);
710 net_device_ctx->device_ctx = dev;
711 hv_set_drvdata(dev, net);
712 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
713 INIT_WORK(&net_device_ctx->work, do_set_multicast);
714
715 net->netdev_ops = &device_ops;
716
717 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
718 NETIF_F_TSO;
719 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
720 NETIF_F_IP_CSUM | NETIF_F_TSO;
721
722 SET_ETHTOOL_OPS(net, ðtool_ops);
723 SET_NETDEV_DEV(net, &dev->device);
724
725 /* Notify the netvsc driver of the new device */
726 device_info.ring_size = ring_size;
727 ret = rndis_filter_device_add(dev, &device_info);
728 if (ret != 0) {
729 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
730 free_netdev(net);
731 hv_set_drvdata(dev, NULL);
732 return ret;
733 }
734 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
735
736 ret = register_netdev(net);
737 if (ret != 0) {
738 pr_err("Unable to register netdev.\n");
739 rndis_filter_device_remove(dev);
740 free_netdev(net);
741 } else {
742 schedule_delayed_work(&net_device_ctx->dwork, 0);
743 }
744
745 return ret;
746}
747
748static int netvsc_remove(struct hv_device *dev)
749{
750 struct net_device *net;
751 struct net_device_context *ndev_ctx;
752 struct netvsc_device *net_device;
753
754 net_device = hv_get_drvdata(dev);
755 net = net_device->ndev;
756
757 if (net == NULL) {
758 dev_err(&dev->device, "No net device to remove\n");
759 return 0;
760 }
761
762 net_device->start_remove = true;
763
764 ndev_ctx = netdev_priv(net);
765 cancel_delayed_work_sync(&ndev_ctx->dwork);
766 cancel_work_sync(&ndev_ctx->work);
767
768 /* Stop outbound asap */
769 netif_tx_disable(net);
770
771 unregister_netdev(net);
772
773 /*
774 * Call to the vsc driver to let it know that the device is being
775 * removed
776 */
777 rndis_filter_device_remove(dev);
778
779 free_netdev(net);
780 return 0;
781}
782
783static const struct hv_vmbus_device_id id_table[] = {
784 /* Network guid */
785 { HV_NIC_GUID, },
786 { },
787};
788
789MODULE_DEVICE_TABLE(vmbus, id_table);
790
791/* The one and only one */
792static struct hv_driver netvsc_drv = {
793 .name = KBUILD_MODNAME,
794 .id_table = id_table,
795 .probe = netvsc_probe,
796 .remove = netvsc_remove,
797};
798
799static void __exit netvsc_drv_exit(void)
800{
801 vmbus_driver_unregister(&netvsc_drv);
802}
803
804static int __init netvsc_drv_init(void)
805{
806 if (ring_size < RING_SIZE_MIN) {
807 ring_size = RING_SIZE_MIN;
808 pr_info("Increased ring_size to %d (min allowed)\n",
809 ring_size);
810 }
811 return vmbus_driver_register(&netvsc_drv);
812}
813
814MODULE_LICENSE("GPL");
815MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
816
817module_init(netvsc_drv_init);
818module_exit(netvsc_drv_exit);
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 <net/arp.h>
37#include <net/route.h>
38#include <net/sock.h>
39#include <net/pkt_sched.h>
40
41#include "hyperv_net.h"
42
43
44#define RING_SIZE_MIN 64
45#define LINKCHANGE_INT (2 * HZ)
46#define NETVSC_HW_FEATURES (NETIF_F_RXCSUM | \
47 NETIF_F_SG | \
48 NETIF_F_TSO | \
49 NETIF_F_TSO6 | \
50 NETIF_F_HW_CSUM)
51static int ring_size = 128;
52module_param(ring_size, int, S_IRUGO);
53MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
54
55static int max_num_vrss_chns = 8;
56
57static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
58 NETIF_MSG_LINK | NETIF_MSG_IFUP |
59 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
60 NETIF_MSG_TX_ERR;
61
62static int debug = -1;
63module_param(debug, int, S_IRUGO);
64MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
65
66static void do_set_multicast(struct work_struct *w)
67{
68 struct net_device_context *ndevctx =
69 container_of(w, struct net_device_context, work);
70 struct netvsc_device *nvdev;
71 struct rndis_device *rdev;
72
73 nvdev = hv_get_drvdata(ndevctx->device_ctx);
74 if (nvdev == NULL || nvdev->ndev == NULL)
75 return;
76
77 rdev = nvdev->extension;
78 if (rdev == NULL)
79 return;
80
81 if (nvdev->ndev->flags & IFF_PROMISC)
82 rndis_filter_set_packet_filter(rdev,
83 NDIS_PACKET_TYPE_PROMISCUOUS);
84 else
85 rndis_filter_set_packet_filter(rdev,
86 NDIS_PACKET_TYPE_BROADCAST |
87 NDIS_PACKET_TYPE_ALL_MULTICAST |
88 NDIS_PACKET_TYPE_DIRECTED);
89}
90
91static void netvsc_set_multicast_list(struct net_device *net)
92{
93 struct net_device_context *net_device_ctx = netdev_priv(net);
94
95 schedule_work(&net_device_ctx->work);
96}
97
98static int netvsc_open(struct net_device *net)
99{
100 struct net_device_context *net_device_ctx = netdev_priv(net);
101 struct hv_device *device_obj = net_device_ctx->device_ctx;
102 struct netvsc_device *nvdev;
103 struct rndis_device *rdev;
104 int ret = 0;
105
106 netif_carrier_off(net);
107
108 /* Open up the device */
109 ret = rndis_filter_open(device_obj);
110 if (ret != 0) {
111 netdev_err(net, "unable to open device (ret %d).\n", ret);
112 return ret;
113 }
114
115 netif_tx_wake_all_queues(net);
116
117 nvdev = hv_get_drvdata(device_obj);
118 rdev = nvdev->extension;
119 if (!rdev->link_state)
120 netif_carrier_on(net);
121
122 return ret;
123}
124
125static int netvsc_close(struct net_device *net)
126{
127 struct net_device_context *net_device_ctx = netdev_priv(net);
128 struct hv_device *device_obj = net_device_ctx->device_ctx;
129 struct netvsc_device *nvdev = hv_get_drvdata(device_obj);
130 int ret;
131 u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
132 struct vmbus_channel *chn;
133
134 netif_tx_disable(net);
135
136 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
137 cancel_work_sync(&net_device_ctx->work);
138 ret = rndis_filter_close(device_obj);
139 if (ret != 0) {
140 netdev_err(net, "unable to close device (ret %d).\n", ret);
141 return ret;
142 }
143
144 /* Ensure pending bytes in ring are read */
145 while (true) {
146 aread = 0;
147 for (i = 0; i < nvdev->num_chn; i++) {
148 chn = nvdev->chn_table[i];
149 if (!chn)
150 continue;
151
152 hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
153 &awrite);
154
155 if (aread)
156 break;
157
158 hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
159 &awrite);
160
161 if (aread)
162 break;
163 }
164
165 retry++;
166 if (retry > retry_max || aread == 0)
167 break;
168
169 msleep(msec);
170
171 if (msec < 1000)
172 msec *= 2;
173 }
174
175 if (aread) {
176 netdev_err(net, "Ring buffer not empty after closing rndis\n");
177 ret = -ETIMEDOUT;
178 }
179
180 return ret;
181}
182
183static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
184 int pkt_type)
185{
186 struct rndis_packet *rndis_pkt;
187 struct rndis_per_packet_info *ppi;
188
189 rndis_pkt = &msg->msg.pkt;
190 rndis_pkt->data_offset += ppi_size;
191
192 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
193 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
194
195 ppi->size = ppi_size;
196 ppi->type = pkt_type;
197 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
198
199 rndis_pkt->per_pkt_info_len += ppi_size;
200
201 return ppi;
202}
203
204static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
205 void *accel_priv, select_queue_fallback_t fallback)
206{
207 struct net_device_context *net_device_ctx = netdev_priv(ndev);
208 struct hv_device *hdev = net_device_ctx->device_ctx;
209 struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev);
210 u32 hash;
211 u16 q_idx = 0;
212
213 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
214 return 0;
215
216 hash = skb_get_hash(skb);
217 q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
218 ndev->real_num_tx_queues;
219
220 if (!nvsc_dev->chn_table[q_idx])
221 q_idx = 0;
222
223 return q_idx;
224}
225
226static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
227 struct hv_page_buffer *pb)
228{
229 int j = 0;
230
231 /* Deal with compund pages by ignoring unused part
232 * of the page.
233 */
234 page += (offset >> PAGE_SHIFT);
235 offset &= ~PAGE_MASK;
236
237 while (len > 0) {
238 unsigned long bytes;
239
240 bytes = PAGE_SIZE - offset;
241 if (bytes > len)
242 bytes = len;
243 pb[j].pfn = page_to_pfn(page);
244 pb[j].offset = offset;
245 pb[j].len = bytes;
246
247 offset += bytes;
248 len -= bytes;
249
250 if (offset == PAGE_SIZE && len) {
251 page++;
252 offset = 0;
253 j++;
254 }
255 }
256
257 return j + 1;
258}
259
260static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
261 struct hv_netvsc_packet *packet,
262 struct hv_page_buffer **page_buf)
263{
264 struct hv_page_buffer *pb = *page_buf;
265 u32 slots_used = 0;
266 char *data = skb->data;
267 int frags = skb_shinfo(skb)->nr_frags;
268 int i;
269
270 /* The packet is laid out thus:
271 * 1. hdr: RNDIS header and PPI
272 * 2. skb linear data
273 * 3. skb fragment data
274 */
275 if (hdr != NULL)
276 slots_used += fill_pg_buf(virt_to_page(hdr),
277 offset_in_page(hdr),
278 len, &pb[slots_used]);
279
280 packet->rmsg_size = len;
281 packet->rmsg_pgcnt = slots_used;
282
283 slots_used += fill_pg_buf(virt_to_page(data),
284 offset_in_page(data),
285 skb_headlen(skb), &pb[slots_used]);
286
287 for (i = 0; i < frags; i++) {
288 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
289
290 slots_used += fill_pg_buf(skb_frag_page(frag),
291 frag->page_offset,
292 skb_frag_size(frag), &pb[slots_used]);
293 }
294 return slots_used;
295}
296
297static int count_skb_frag_slots(struct sk_buff *skb)
298{
299 int i, frags = skb_shinfo(skb)->nr_frags;
300 int pages = 0;
301
302 for (i = 0; i < frags; i++) {
303 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
304 unsigned long size = skb_frag_size(frag);
305 unsigned long offset = frag->page_offset;
306
307 /* Skip unused frames from start of page */
308 offset &= ~PAGE_MASK;
309 pages += PFN_UP(offset + size);
310 }
311 return pages;
312}
313
314static int netvsc_get_slots(struct sk_buff *skb)
315{
316 char *data = skb->data;
317 unsigned int offset = offset_in_page(data);
318 unsigned int len = skb_headlen(skb);
319 int slots;
320 int frag_slots;
321
322 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
323 frag_slots = count_skb_frag_slots(skb);
324 return slots + frag_slots;
325}
326
327static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
328{
329 u32 ret_val = TRANSPORT_INFO_NOT_IP;
330
331 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
332 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
333 goto not_ip;
334 }
335
336 *trans_off = skb_transport_offset(skb);
337
338 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
339 struct iphdr *iphdr = ip_hdr(skb);
340
341 if (iphdr->protocol == IPPROTO_TCP)
342 ret_val = TRANSPORT_INFO_IPV4_TCP;
343 else if (iphdr->protocol == IPPROTO_UDP)
344 ret_val = TRANSPORT_INFO_IPV4_UDP;
345 } else {
346 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
347 ret_val = TRANSPORT_INFO_IPV6_TCP;
348 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
349 ret_val = TRANSPORT_INFO_IPV6_UDP;
350 }
351
352not_ip:
353 return ret_val;
354}
355
356static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
357{
358 struct net_device_context *net_device_ctx = netdev_priv(net);
359 struct hv_netvsc_packet *packet = NULL;
360 int ret;
361 unsigned int num_data_pgs;
362 struct rndis_message *rndis_msg;
363 struct rndis_packet *rndis_pkt;
364 u32 rndis_msg_size;
365 bool isvlan;
366 bool linear = false;
367 struct rndis_per_packet_info *ppi;
368 struct ndis_tcp_ip_checksum_info *csum_info;
369 struct ndis_tcp_lso_info *lso_info;
370 int hdr_offset;
371 u32 net_trans_info;
372 u32 hash;
373 u32 skb_length;
374 struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
375 struct hv_page_buffer *pb = page_buf;
376 struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats);
377
378 /* We will atmost need two pages to describe the rndis
379 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
380 * of pages in a single packet. If skb is scattered around
381 * more pages we try linearizing it.
382 */
383
384check_size:
385 skb_length = skb->len;
386 num_data_pgs = netvsc_get_slots(skb) + 2;
387 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) {
388 net_alert_ratelimited("packet too big: %u pages (%u bytes)\n",
389 num_data_pgs, skb->len);
390 ret = -EFAULT;
391 goto drop;
392 } else if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
393 if (skb_linearize(skb)) {
394 net_alert_ratelimited("failed to linearize skb\n");
395 ret = -ENOMEM;
396 goto drop;
397 }
398 linear = true;
399 goto check_size;
400 }
401
402 /*
403 * Place the rndis header in the skb head room and
404 * the skb->cb will be used for hv_netvsc_packet
405 * structure.
406 */
407 ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
408 if (ret) {
409 netdev_err(net, "unable to alloc hv_netvsc_packet\n");
410 ret = -ENOMEM;
411 goto drop;
412 }
413 /* Use the skb control buffer for building up the packet */
414 BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
415 FIELD_SIZEOF(struct sk_buff, cb));
416 packet = (struct hv_netvsc_packet *)skb->cb;
417
418
419 packet->q_idx = skb_get_queue_mapping(skb);
420
421 packet->total_data_buflen = skb->len;
422
423 rndis_msg = (struct rndis_message *)skb->head;
424
425 memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
426
427 isvlan = skb->vlan_tci & VLAN_TAG_PRESENT;
428
429 /* Add the rndis header */
430 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
431 rndis_msg->msg_len = packet->total_data_buflen;
432 rndis_pkt = &rndis_msg->msg.pkt;
433 rndis_pkt->data_offset = sizeof(struct rndis_packet);
434 rndis_pkt->data_len = packet->total_data_buflen;
435 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
436
437 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
438
439 hash = skb_get_hash_raw(skb);
440 if (hash != 0 && net->real_num_tx_queues > 1) {
441 rndis_msg_size += NDIS_HASH_PPI_SIZE;
442 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
443 NBL_HASH_VALUE);
444 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
445 }
446
447 if (isvlan) {
448 struct ndis_pkt_8021q_info *vlan;
449
450 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
451 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
452 IEEE_8021Q_INFO);
453 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
454 ppi->ppi_offset);
455 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
456 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
457 VLAN_PRIO_SHIFT;
458 }
459
460 net_trans_info = get_net_transport_info(skb, &hdr_offset);
461 if (net_trans_info == TRANSPORT_INFO_NOT_IP)
462 goto do_send;
463
464 /*
465 * Setup the sendside checksum offload only if this is not a
466 * GSO packet.
467 */
468 if (skb_is_gso(skb))
469 goto do_lso;
470
471 if ((skb->ip_summed == CHECKSUM_NONE) ||
472 (skb->ip_summed == CHECKSUM_UNNECESSARY))
473 goto do_send;
474
475 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
476 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
477 TCPIP_CHKSUM_PKTINFO);
478
479 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
480 ppi->ppi_offset);
481
482 if (net_trans_info & (INFO_IPV4 << 16))
483 csum_info->transmit.is_ipv4 = 1;
484 else
485 csum_info->transmit.is_ipv6 = 1;
486
487 if (net_trans_info & INFO_TCP) {
488 csum_info->transmit.tcp_checksum = 1;
489 csum_info->transmit.tcp_header_offset = hdr_offset;
490 } else if (net_trans_info & INFO_UDP) {
491 /* UDP checksum offload is not supported on ws2008r2.
492 * Furthermore, on ws2012 and ws2012r2, there are some
493 * issues with udp checksum offload from Linux guests.
494 * (these are host issues).
495 * For now compute the checksum here.
496 */
497 struct udphdr *uh;
498 u16 udp_len;
499
500 ret = skb_cow_head(skb, 0);
501 if (ret)
502 goto drop;
503
504 uh = udp_hdr(skb);
505 udp_len = ntohs(uh->len);
506 uh->check = 0;
507 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
508 ip_hdr(skb)->daddr,
509 udp_len, IPPROTO_UDP,
510 csum_partial(uh, udp_len, 0));
511 if (uh->check == 0)
512 uh->check = CSUM_MANGLED_0;
513
514 csum_info->transmit.udp_checksum = 0;
515 }
516 goto do_send;
517
518do_lso:
519 rndis_msg_size += NDIS_LSO_PPI_SIZE;
520 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
521 TCP_LARGESEND_PKTINFO);
522
523 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
524 ppi->ppi_offset);
525
526 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
527 if (net_trans_info & (INFO_IPV4 << 16)) {
528 lso_info->lso_v2_transmit.ip_version =
529 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
530 ip_hdr(skb)->tot_len = 0;
531 ip_hdr(skb)->check = 0;
532 tcp_hdr(skb)->check =
533 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
534 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
535 } else {
536 lso_info->lso_v2_transmit.ip_version =
537 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
538 ipv6_hdr(skb)->payload_len = 0;
539 tcp_hdr(skb)->check =
540 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
541 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
542 }
543 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
544 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
545
546do_send:
547 /* Start filling in the page buffers with the rndis hdr */
548 rndis_msg->msg_len += rndis_msg_size;
549 packet->total_data_buflen = rndis_msg->msg_len;
550 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
551 skb, packet, &pb);
552
553 /* timestamp packet in software */
554 skb_tx_timestamp(skb);
555 ret = netvsc_send(net_device_ctx->device_ctx, packet,
556 rndis_msg, &pb, skb);
557
558drop:
559 if (ret == 0) {
560 u64_stats_update_begin(&tx_stats->syncp);
561 tx_stats->packets++;
562 tx_stats->bytes += skb_length;
563 u64_stats_update_end(&tx_stats->syncp);
564 } else {
565 if (ret != -EAGAIN) {
566 dev_kfree_skb_any(skb);
567 net->stats.tx_dropped++;
568 }
569 }
570
571 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
572}
573
574/*
575 * netvsc_linkstatus_callback - Link up/down notification
576 */
577void netvsc_linkstatus_callback(struct hv_device *device_obj,
578 struct rndis_message *resp)
579{
580 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
581 struct net_device *net;
582 struct net_device_context *ndev_ctx;
583 struct netvsc_device *net_device;
584 struct netvsc_reconfig *event;
585 unsigned long flags;
586
587 /* Handle link change statuses only */
588 if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
589 indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
590 indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
591 return;
592
593 net_device = hv_get_drvdata(device_obj);
594 net = net_device->ndev;
595
596 if (!net || net->reg_state != NETREG_REGISTERED)
597 return;
598
599 ndev_ctx = netdev_priv(net);
600
601 event = kzalloc(sizeof(*event), GFP_ATOMIC);
602 if (!event)
603 return;
604 event->event = indicate->status;
605
606 spin_lock_irqsave(&ndev_ctx->lock, flags);
607 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
608 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
609
610 schedule_delayed_work(&ndev_ctx->dwork, 0);
611}
612
613/*
614 * netvsc_recv_callback - Callback when we receive a packet from the
615 * "wire" on the specified device.
616 */
617int netvsc_recv_callback(struct hv_device *device_obj,
618 struct hv_netvsc_packet *packet,
619 void **data,
620 struct ndis_tcp_ip_checksum_info *csum_info,
621 struct vmbus_channel *channel,
622 u16 vlan_tci)
623{
624 struct net_device *net;
625 struct net_device_context *net_device_ctx;
626 struct sk_buff *skb;
627 struct netvsc_stats *rx_stats;
628
629 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
630 if (!net || net->reg_state != NETREG_REGISTERED) {
631 return NVSP_STAT_FAIL;
632 }
633 net_device_ctx = netdev_priv(net);
634 rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
635
636 /* Allocate a skb - TODO direct I/O to pages? */
637 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
638 if (unlikely(!skb)) {
639 ++net->stats.rx_dropped;
640 return NVSP_STAT_FAIL;
641 }
642
643 /*
644 * Copy to skb. This copy is needed here since the memory pointed by
645 * hv_netvsc_packet cannot be deallocated
646 */
647 memcpy(skb_put(skb, packet->total_data_buflen), *data,
648 packet->total_data_buflen);
649
650 skb->protocol = eth_type_trans(skb, net);
651 if (csum_info) {
652 /* We only look at the IP checksum here.
653 * Should we be dropping the packet if checksum
654 * failed? How do we deal with other checksums - TCP/UDP?
655 */
656 if (csum_info->receive.ip_checksum_succeeded)
657 skb->ip_summed = CHECKSUM_UNNECESSARY;
658 else
659 skb->ip_summed = CHECKSUM_NONE;
660 }
661
662 if (vlan_tci & VLAN_TAG_PRESENT)
663 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
664 vlan_tci);
665
666 skb_record_rx_queue(skb, channel->
667 offermsg.offer.sub_channel_index);
668
669 u64_stats_update_begin(&rx_stats->syncp);
670 rx_stats->packets++;
671 rx_stats->bytes += packet->total_data_buflen;
672 u64_stats_update_end(&rx_stats->syncp);
673
674 /*
675 * Pass the skb back up. Network stack will deallocate the skb when it
676 * is done.
677 * TODO - use NAPI?
678 */
679 netif_rx(skb);
680
681 return 0;
682}
683
684static void netvsc_get_drvinfo(struct net_device *net,
685 struct ethtool_drvinfo *info)
686{
687 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
688 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
689}
690
691static void netvsc_get_channels(struct net_device *net,
692 struct ethtool_channels *channel)
693{
694 struct net_device_context *net_device_ctx = netdev_priv(net);
695 struct hv_device *dev = net_device_ctx->device_ctx;
696 struct netvsc_device *nvdev = hv_get_drvdata(dev);
697
698 if (nvdev) {
699 channel->max_combined = nvdev->max_chn;
700 channel->combined_count = nvdev->num_chn;
701 }
702}
703
704static int netvsc_set_channels(struct net_device *net,
705 struct ethtool_channels *channels)
706{
707 struct net_device_context *net_device_ctx = netdev_priv(net);
708 struct hv_device *dev = net_device_ctx->device_ctx;
709 struct netvsc_device *nvdev = hv_get_drvdata(dev);
710 struct netvsc_device_info device_info;
711 u32 num_chn;
712 u32 max_chn;
713 int ret = 0;
714 bool recovering = false;
715
716 if (!nvdev || nvdev->destroy)
717 return -ENODEV;
718
719 num_chn = nvdev->num_chn;
720 max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
721
722 if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) {
723 pr_info("vRSS unsupported before NVSP Version 5\n");
724 return -EINVAL;
725 }
726
727 /* We do not support rx, tx, or other */
728 if (!channels ||
729 channels->rx_count ||
730 channels->tx_count ||
731 channels->other_count ||
732 (channels->combined_count < 1))
733 return -EINVAL;
734
735 if (channels->combined_count > max_chn) {
736 pr_info("combined channels too high, using %d\n", max_chn);
737 channels->combined_count = max_chn;
738 }
739
740 ret = netvsc_close(net);
741 if (ret)
742 goto out;
743
744 do_set:
745 nvdev->start_remove = true;
746 rndis_filter_device_remove(dev);
747
748 nvdev->num_chn = channels->combined_count;
749
750 net_device_ctx->device_ctx = dev;
751 hv_set_drvdata(dev, net);
752
753 memset(&device_info, 0, sizeof(device_info));
754 device_info.num_chn = nvdev->num_chn; /* passed to RNDIS */
755 device_info.ring_size = ring_size;
756 device_info.max_num_vrss_chns = max_num_vrss_chns;
757
758 ret = rndis_filter_device_add(dev, &device_info);
759 if (ret) {
760 if (recovering) {
761 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
762 return ret;
763 }
764 goto recover;
765 }
766
767 nvdev = hv_get_drvdata(dev);
768
769 ret = netif_set_real_num_tx_queues(net, nvdev->num_chn);
770 if (ret) {
771 if (recovering) {
772 netdev_err(net, "could not set tx queue count (ret %d)\n", ret);
773 return ret;
774 }
775 goto recover;
776 }
777
778 ret = netif_set_real_num_rx_queues(net, nvdev->num_chn);
779 if (ret) {
780 if (recovering) {
781 netdev_err(net, "could not set rx queue count (ret %d)\n", ret);
782 return ret;
783 }
784 goto recover;
785 }
786
787 out:
788 netvsc_open(net);
789
790 return ret;
791
792 recover:
793 /* If the above failed, we attempt to recover through the same
794 * process but with the original number of channels.
795 */
796 netdev_err(net, "could not set channels, recovering\n");
797 recovering = true;
798 channels->combined_count = num_chn;
799 goto do_set;
800}
801
802static bool netvsc_validate_ethtool_ss_cmd(const struct ethtool_cmd *cmd)
803{
804 struct ethtool_cmd diff1 = *cmd;
805 struct ethtool_cmd diff2 = {};
806
807 ethtool_cmd_speed_set(&diff1, 0);
808 diff1.duplex = 0;
809 /* advertising and cmd are usually set */
810 diff1.advertising = 0;
811 diff1.cmd = 0;
812 /* We set port to PORT_OTHER */
813 diff2.port = PORT_OTHER;
814
815 return !memcmp(&diff1, &diff2, sizeof(diff1));
816}
817
818static void netvsc_init_settings(struct net_device *dev)
819{
820 struct net_device_context *ndc = netdev_priv(dev);
821
822 ndc->speed = SPEED_UNKNOWN;
823 ndc->duplex = DUPLEX_UNKNOWN;
824}
825
826static int netvsc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
827{
828 struct net_device_context *ndc = netdev_priv(dev);
829
830 ethtool_cmd_speed_set(cmd, ndc->speed);
831 cmd->duplex = ndc->duplex;
832 cmd->port = PORT_OTHER;
833
834 return 0;
835}
836
837static int netvsc_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
838{
839 struct net_device_context *ndc = netdev_priv(dev);
840 u32 speed;
841
842 speed = ethtool_cmd_speed(cmd);
843 if (!ethtool_validate_speed(speed) ||
844 !ethtool_validate_duplex(cmd->duplex) ||
845 !netvsc_validate_ethtool_ss_cmd(cmd))
846 return -EINVAL;
847
848 ndc->speed = speed;
849 ndc->duplex = cmd->duplex;
850
851 return 0;
852}
853
854static int netvsc_change_mtu(struct net_device *ndev, int mtu)
855{
856 struct net_device_context *ndevctx = netdev_priv(ndev);
857 struct hv_device *hdev = ndevctx->device_ctx;
858 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
859 struct netvsc_device_info device_info;
860 int limit = ETH_DATA_LEN;
861 u32 num_chn;
862 int ret = 0;
863
864 if (nvdev == NULL || nvdev->destroy)
865 return -ENODEV;
866
867 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
868 limit = NETVSC_MTU - ETH_HLEN;
869
870 if (mtu < NETVSC_MTU_MIN || mtu > limit)
871 return -EINVAL;
872
873 ret = netvsc_close(ndev);
874 if (ret)
875 goto out;
876
877 num_chn = nvdev->num_chn;
878
879 nvdev->start_remove = true;
880 rndis_filter_device_remove(hdev);
881
882 ndev->mtu = mtu;
883
884 ndevctx->device_ctx = hdev;
885 hv_set_drvdata(hdev, ndev);
886
887 memset(&device_info, 0, sizeof(device_info));
888 device_info.ring_size = ring_size;
889 device_info.num_chn = num_chn;
890 device_info.max_num_vrss_chns = max_num_vrss_chns;
891 rndis_filter_device_add(hdev, &device_info);
892
893out:
894 netvsc_open(ndev);
895
896 return ret;
897}
898
899static struct rtnl_link_stats64 *netvsc_get_stats64(struct net_device *net,
900 struct rtnl_link_stats64 *t)
901{
902 struct net_device_context *ndev_ctx = netdev_priv(net);
903 int cpu;
904
905 for_each_possible_cpu(cpu) {
906 struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats,
907 cpu);
908 struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats,
909 cpu);
910 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
911 unsigned int start;
912
913 do {
914 start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
915 tx_packets = tx_stats->packets;
916 tx_bytes = tx_stats->bytes;
917 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
918
919 do {
920 start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
921 rx_packets = rx_stats->packets;
922 rx_bytes = rx_stats->bytes;
923 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
924
925 t->tx_bytes += tx_bytes;
926 t->tx_packets += tx_packets;
927 t->rx_bytes += rx_bytes;
928 t->rx_packets += rx_packets;
929 }
930
931 t->tx_dropped = net->stats.tx_dropped;
932 t->tx_errors = net->stats.tx_dropped;
933
934 t->rx_dropped = net->stats.rx_dropped;
935 t->rx_errors = net->stats.rx_errors;
936
937 return t;
938}
939
940static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
941{
942 struct net_device_context *ndevctx = netdev_priv(ndev);
943 struct hv_device *hdev = ndevctx->device_ctx;
944 struct sockaddr *addr = p;
945 char save_adr[ETH_ALEN];
946 unsigned char save_aatype;
947 int err;
948
949 memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
950 save_aatype = ndev->addr_assign_type;
951
952 err = eth_mac_addr(ndev, p);
953 if (err != 0)
954 return err;
955
956 err = rndis_filter_set_device_mac(hdev, addr->sa_data);
957 if (err != 0) {
958 /* roll back to saved MAC */
959 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
960 ndev->addr_assign_type = save_aatype;
961 }
962
963 return err;
964}
965
966#ifdef CONFIG_NET_POLL_CONTROLLER
967static void netvsc_poll_controller(struct net_device *net)
968{
969 /* As netvsc_start_xmit() works synchronous we don't have to
970 * trigger anything here.
971 */
972}
973#endif
974
975static const struct ethtool_ops ethtool_ops = {
976 .get_drvinfo = netvsc_get_drvinfo,
977 .get_link = ethtool_op_get_link,
978 .get_channels = netvsc_get_channels,
979 .set_channels = netvsc_set_channels,
980 .get_ts_info = ethtool_op_get_ts_info,
981 .get_settings = netvsc_get_settings,
982 .set_settings = netvsc_set_settings,
983};
984
985static const struct net_device_ops device_ops = {
986 .ndo_open = netvsc_open,
987 .ndo_stop = netvsc_close,
988 .ndo_start_xmit = netvsc_start_xmit,
989 .ndo_set_rx_mode = netvsc_set_multicast_list,
990 .ndo_change_mtu = netvsc_change_mtu,
991 .ndo_validate_addr = eth_validate_addr,
992 .ndo_set_mac_address = netvsc_set_mac_addr,
993 .ndo_select_queue = netvsc_select_queue,
994 .ndo_get_stats64 = netvsc_get_stats64,
995#ifdef CONFIG_NET_POLL_CONTROLLER
996 .ndo_poll_controller = netvsc_poll_controller,
997#endif
998};
999
1000/*
1001 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1002 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1003 * present send GARP packet to network peers with netif_notify_peers().
1004 */
1005static void netvsc_link_change(struct work_struct *w)
1006{
1007 struct net_device_context *ndev_ctx;
1008 struct net_device *net;
1009 struct netvsc_device *net_device;
1010 struct rndis_device *rdev;
1011 struct netvsc_reconfig *event = NULL;
1012 bool notify = false, reschedule = false;
1013 unsigned long flags, next_reconfig, delay;
1014
1015 ndev_ctx = container_of(w, struct net_device_context, dwork.work);
1016 net_device = hv_get_drvdata(ndev_ctx->device_ctx);
1017 rdev = net_device->extension;
1018 net = net_device->ndev;
1019
1020 next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1021 if (time_is_after_jiffies(next_reconfig)) {
1022 /* link_watch only sends one notification with current state
1023 * per second, avoid doing reconfig more frequently. Handle
1024 * wrap around.
1025 */
1026 delay = next_reconfig - jiffies;
1027 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1028 schedule_delayed_work(&ndev_ctx->dwork, delay);
1029 return;
1030 }
1031 ndev_ctx->last_reconfig = jiffies;
1032
1033 spin_lock_irqsave(&ndev_ctx->lock, flags);
1034 if (!list_empty(&ndev_ctx->reconfig_events)) {
1035 event = list_first_entry(&ndev_ctx->reconfig_events,
1036 struct netvsc_reconfig, list);
1037 list_del(&event->list);
1038 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1039 }
1040 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1041
1042 if (!event)
1043 return;
1044
1045 rtnl_lock();
1046
1047 switch (event->event) {
1048 /* Only the following events are possible due to the check in
1049 * netvsc_linkstatus_callback()
1050 */
1051 case RNDIS_STATUS_MEDIA_CONNECT:
1052 if (rdev->link_state) {
1053 rdev->link_state = false;
1054 netif_carrier_on(net);
1055 netif_tx_wake_all_queues(net);
1056 } else {
1057 notify = true;
1058 }
1059 kfree(event);
1060 break;
1061 case RNDIS_STATUS_MEDIA_DISCONNECT:
1062 if (!rdev->link_state) {
1063 rdev->link_state = true;
1064 netif_carrier_off(net);
1065 netif_tx_stop_all_queues(net);
1066 }
1067 kfree(event);
1068 break;
1069 case RNDIS_STATUS_NETWORK_CHANGE:
1070 /* Only makes sense if carrier is present */
1071 if (!rdev->link_state) {
1072 rdev->link_state = true;
1073 netif_carrier_off(net);
1074 netif_tx_stop_all_queues(net);
1075 event->event = RNDIS_STATUS_MEDIA_CONNECT;
1076 spin_lock_irqsave(&ndev_ctx->lock, flags);
1077 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
1078 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1079 reschedule = true;
1080 }
1081 break;
1082 }
1083
1084 rtnl_unlock();
1085
1086 if (notify)
1087 netdev_notify_peers(net);
1088
1089 /* link_watch only sends one notification with current state per
1090 * second, handle next reconfig event in 2 seconds.
1091 */
1092 if (reschedule)
1093 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1094}
1095
1096static void netvsc_free_netdev(struct net_device *netdev)
1097{
1098 struct net_device_context *net_device_ctx = netdev_priv(netdev);
1099
1100 free_percpu(net_device_ctx->tx_stats);
1101 free_percpu(net_device_ctx->rx_stats);
1102 free_netdev(netdev);
1103}
1104
1105static int netvsc_probe(struct hv_device *dev,
1106 const struct hv_vmbus_device_id *dev_id)
1107{
1108 struct net_device *net = NULL;
1109 struct net_device_context *net_device_ctx;
1110 struct netvsc_device_info device_info;
1111 struct netvsc_device *nvdev;
1112 int ret;
1113
1114 net = alloc_etherdev_mq(sizeof(struct net_device_context),
1115 num_online_cpus());
1116 if (!net)
1117 return -ENOMEM;
1118
1119 netif_carrier_off(net);
1120
1121 net_device_ctx = netdev_priv(net);
1122 net_device_ctx->device_ctx = dev;
1123 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1124 if (netif_msg_probe(net_device_ctx))
1125 netdev_dbg(net, "netvsc msg_enable: %d\n",
1126 net_device_ctx->msg_enable);
1127
1128 net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1129 if (!net_device_ctx->tx_stats) {
1130 free_netdev(net);
1131 return -ENOMEM;
1132 }
1133 net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1134 if (!net_device_ctx->rx_stats) {
1135 free_percpu(net_device_ctx->tx_stats);
1136 free_netdev(net);
1137 return -ENOMEM;
1138 }
1139
1140 hv_set_drvdata(dev, net);
1141 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1142 INIT_WORK(&net_device_ctx->work, do_set_multicast);
1143
1144 spin_lock_init(&net_device_ctx->lock);
1145 INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1146
1147 net->netdev_ops = &device_ops;
1148
1149 net->hw_features = NETVSC_HW_FEATURES;
1150 net->features = NETVSC_HW_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
1151
1152 net->ethtool_ops = ðtool_ops;
1153 SET_NETDEV_DEV(net, &dev->device);
1154
1155 /* We always need headroom for rndis header */
1156 net->needed_headroom = RNDIS_AND_PPI_SIZE;
1157
1158 /* Notify the netvsc driver of the new device */
1159 memset(&device_info, 0, sizeof(device_info));
1160 device_info.ring_size = ring_size;
1161 device_info.max_num_vrss_chns = max_num_vrss_chns;
1162 ret = rndis_filter_device_add(dev, &device_info);
1163 if (ret != 0) {
1164 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1165 netvsc_free_netdev(net);
1166 hv_set_drvdata(dev, NULL);
1167 return ret;
1168 }
1169 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1170
1171 nvdev = hv_get_drvdata(dev);
1172 netif_set_real_num_tx_queues(net, nvdev->num_chn);
1173 netif_set_real_num_rx_queues(net, nvdev->num_chn);
1174
1175 netvsc_init_settings(net);
1176
1177 ret = register_netdev(net);
1178 if (ret != 0) {
1179 pr_err("Unable to register netdev.\n");
1180 rndis_filter_device_remove(dev);
1181 netvsc_free_netdev(net);
1182 }
1183
1184 return ret;
1185}
1186
1187static int netvsc_remove(struct hv_device *dev)
1188{
1189 struct net_device *net;
1190 struct net_device_context *ndev_ctx;
1191 struct netvsc_device *net_device;
1192
1193 net_device = hv_get_drvdata(dev);
1194 net = net_device->ndev;
1195
1196 if (net == NULL) {
1197 dev_err(&dev->device, "No net device to remove\n");
1198 return 0;
1199 }
1200
1201 net_device->start_remove = true;
1202
1203 ndev_ctx = netdev_priv(net);
1204 cancel_delayed_work_sync(&ndev_ctx->dwork);
1205 cancel_work_sync(&ndev_ctx->work);
1206
1207 /* Stop outbound asap */
1208 netif_tx_disable(net);
1209
1210 unregister_netdev(net);
1211
1212 /*
1213 * Call to the vsc driver to let it know that the device is being
1214 * removed
1215 */
1216 rndis_filter_device_remove(dev);
1217
1218 netvsc_free_netdev(net);
1219 return 0;
1220}
1221
1222static const struct hv_vmbus_device_id id_table[] = {
1223 /* Network guid */
1224 { HV_NIC_GUID, },
1225 { },
1226};
1227
1228MODULE_DEVICE_TABLE(vmbus, id_table);
1229
1230/* The one and only one */
1231static struct hv_driver netvsc_drv = {
1232 .name = KBUILD_MODNAME,
1233 .id_table = id_table,
1234 .probe = netvsc_probe,
1235 .remove = netvsc_remove,
1236};
1237
1238static void __exit netvsc_drv_exit(void)
1239{
1240 vmbus_driver_unregister(&netvsc_drv);
1241}
1242
1243static int __init netvsc_drv_init(void)
1244{
1245 if (ring_size < RING_SIZE_MIN) {
1246 ring_size = RING_SIZE_MIN;
1247 pr_info("Increased ring_size to %d (min allowed)\n",
1248 ring_size);
1249 }
1250 return vmbus_driver_register(&netvsc_drv);
1251}
1252
1253MODULE_LICENSE("GPL");
1254MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1255
1256module_init(netvsc_drv_init);
1257module_exit(netvsc_drv_exit);