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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);