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mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereference
[linux/fpc-iii.git] / drivers / net / hyperv / netvsc_drv.c
blob7b36d5fecc1f24b95c87477ebd43a06ec5a4f914
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 static int ring_size = 128;
46 module_param(ring_size, int, S_IRUGO);
47 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
48
49 static int max_num_vrss_chns = 8;
50
51 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
52 NETIF_MSG_LINK | NETIF_MSG_IFUP |
53 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
54 NETIF_MSG_TX_ERR;
55
56 static int debug = -1;
57 module_param(debug, int, S_IRUGO);
58 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
59
60 static void do_set_multicast(struct work_struct *w)
61 {
62 struct net_device_context *ndevctx =
63 container_of(w, struct net_device_context, work);
64 struct netvsc_device *nvdev;
65 struct rndis_device *rdev;
66
67 nvdev = hv_get_drvdata(ndevctx->device_ctx);
68 if (nvdev == NULL || nvdev->ndev == NULL)
69 return;
70
71 rdev = nvdev->extension;
72 if (rdev == NULL)
73 return;
74
75 if (nvdev->ndev->flags & IFF_PROMISC)
76 rndis_filter_set_packet_filter(rdev,
77 NDIS_PACKET_TYPE_PROMISCUOUS);
78 else
79 rndis_filter_set_packet_filter(rdev,
80 NDIS_PACKET_TYPE_BROADCAST |
81 NDIS_PACKET_TYPE_ALL_MULTICAST |
82 NDIS_PACKET_TYPE_DIRECTED);
83 }
84
85 static void netvsc_set_multicast_list(struct net_device *net)
86 {
87 struct net_device_context *net_device_ctx = netdev_priv(net);
88
89 schedule_work(&net_device_ctx->work);
90 }
91
92 static int netvsc_open(struct net_device *net)
93 {
94 struct net_device_context *net_device_ctx = netdev_priv(net);
95 struct hv_device *device_obj = net_device_ctx->device_ctx;
96 struct netvsc_device *nvdev;
97 struct rndis_device *rdev;
98 int ret = 0;
99
100 netif_carrier_off(net);
101
102 /* Open up the device */
103 ret = rndis_filter_open(device_obj);
104 if (ret != 0) {
105 netdev_err(net, "unable to open device (ret %d).\n", ret);
106 return ret;
107 }
108
109 netif_tx_wake_all_queues(net);
110
111 nvdev = hv_get_drvdata(device_obj);
112 rdev = nvdev->extension;
113 if (!rdev->link_state)
114 netif_carrier_on(net);
115
116 return ret;
117 }
118
119 static int netvsc_close(struct net_device *net)
120 {
121 struct net_device_context *net_device_ctx = netdev_priv(net);
122 struct hv_device *device_obj = net_device_ctx->device_ctx;
123 struct netvsc_device *nvdev = hv_get_drvdata(device_obj);
124 int ret;
125 u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
126 struct vmbus_channel *chn;
127
128 netif_tx_disable(net);
129
130 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
131 cancel_work_sync(&net_device_ctx->work);
132 ret = rndis_filter_close(device_obj);
133 if (ret != 0) {
134 netdev_err(net, "unable to close device (ret %d).\n", ret);
135 return ret;
136 }
137
138 /* Ensure pending bytes in ring are read */
139 while (true) {
140 aread = 0;
141 for (i = 0; i < nvdev->num_chn; i++) {
142 chn = nvdev->chn_table[i];
143 if (!chn)
144 continue;
145
146 hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
147 &awrite);
148
149 if (aread)
150 break;
151
152 hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
153 &awrite);
154
155 if (aread)
156 break;
157 }
158
159 retry++;
160 if (retry > retry_max || aread == 0)
161 break;
162
163 msleep(msec);
164
165 if (msec < 1000)
166 msec *= 2;
167 }
168
169 if (aread) {
170 netdev_err(net, "Ring buffer not empty after closing rndis\n");
171 ret = -ETIMEDOUT;
172 }
173
174 return ret;
175 }
176
177 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
178 int pkt_type)
179 {
180 struct rndis_packet *rndis_pkt;
181 struct rndis_per_packet_info *ppi;
182
183 rndis_pkt = &msg->msg.pkt;
184 rndis_pkt->data_offset += ppi_size;
185
186 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
187 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
188
189 ppi->size = ppi_size;
190 ppi->type = pkt_type;
191 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
192
193 rndis_pkt->per_pkt_info_len += ppi_size;
194
195 return ppi;
196 }
197
198 union sub_key {
199 u64 k;
200 struct {
201 u8 pad[3];
202 u8 kb;
203 u32 ka;
204 };
205 };
206
207 /* Toeplitz hash function
208 * data: network byte order
209 * return: host byte order
210 */
211 static u32 comp_hash(u8 *key, int klen, void *data, int dlen)
212 {
213 union sub_key subk;
214 int k_next = 4;
215 u8 dt;
216 int i, j;
217 u32 ret = 0;
218
219 subk.k = 0;
220 subk.ka = ntohl(*(u32 *)key);
221
222 for (i = 0; i < dlen; i++) {
223 subk.kb = key[k_next];
224 k_next = (k_next + 1) % klen;
225 dt = ((u8 *)data)[i];
226 for (j = 0; j < 8; j++) {
227 if (dt & 0x80)
228 ret ^= subk.ka;
229 dt <<= 1;
230 subk.k <<= 1;
231 }
232 }
233
234 return ret;
235 }
236
237 static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
238 {
239 struct flow_keys flow;
240 int data_len;
241
242 if (!skb_flow_dissect_flow_keys(skb, &flow) ||
243 !(flow.basic.n_proto == htons(ETH_P_IP) ||
244 flow.basic.n_proto == htons(ETH_P_IPV6)))
245 return false;
246
247 if (flow.basic.ip_proto == IPPROTO_TCP)
248 data_len = 12;
249 else
250 data_len = 8;
251
252 *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len);
253
254 return true;
255 }
256
257 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
258 void *accel_priv, select_queue_fallback_t fallback)
259 {
260 struct net_device_context *net_device_ctx = netdev_priv(ndev);
261 struct hv_device *hdev = net_device_ctx->device_ctx;
262 struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev);
263 u32 hash;
264 u16 q_idx = 0;
265
266 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
267 return 0;
268
269 if (netvsc_set_hash(&hash, skb)) {
270 q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
271 ndev->real_num_tx_queues;
272 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
273 }
274
275 return q_idx;
276 }
277
278 void netvsc_xmit_completion(void *context)
279 {
280 struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
281 struct sk_buff *skb = (struct sk_buff *)
282 (unsigned long)packet->send_completion_tid;
283
284 if (skb)
285 dev_kfree_skb_any(skb);
286 }
287
288 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
289 struct hv_page_buffer *pb)
290 {
291 int j = 0;
292
293 /* Deal with compund pages by ignoring unused part
294 * of the page.
295 */
296 page += (offset >> PAGE_SHIFT);
297 offset &= ~PAGE_MASK;
298
299 while (len > 0) {
300 unsigned long bytes;
301
302 bytes = PAGE_SIZE - offset;
303 if (bytes > len)
304 bytes = len;
305 pb[j].pfn = page_to_pfn(page);
306 pb[j].offset = offset;
307 pb[j].len = bytes;
308
309 offset += bytes;
310 len -= bytes;
311
312 if (offset == PAGE_SIZE && len) {
313 page++;
314 offset = 0;
315 j++;
316 }
317 }
318
319 return j + 1;
320 }
321
322 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
323 struct hv_netvsc_packet *packet)
324 {
325 struct hv_page_buffer *pb = packet->page_buf;
326 u32 slots_used = 0;
327 char *data = skb->data;
328 int frags = skb_shinfo(skb)->nr_frags;
329 int i;
330
331 /* The packet is laid out thus:
332 * 1. hdr: RNDIS header and PPI
333 * 2. skb linear data
334 * 3. skb fragment data
335 */
336 if (hdr != NULL)
337 slots_used += fill_pg_buf(virt_to_page(hdr),
338 offset_in_page(hdr),
339 len, &pb[slots_used]);
340
341 packet->rmsg_size = len;
342 packet->rmsg_pgcnt = slots_used;
343
344 slots_used += fill_pg_buf(virt_to_page(data),
345 offset_in_page(data),
346 skb_headlen(skb), &pb[slots_used]);
347
348 for (i = 0; i < frags; i++) {
349 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
350
351 slots_used += fill_pg_buf(skb_frag_page(frag),
352 frag->page_offset,
353 skb_frag_size(frag), &pb[slots_used]);
354 }
355 return slots_used;
356 }
357
358 static int count_skb_frag_slots(struct sk_buff *skb)
359 {
360 int i, frags = skb_shinfo(skb)->nr_frags;
361 int pages = 0;
362
363 for (i = 0; i < frags; i++) {
364 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
365 unsigned long size = skb_frag_size(frag);
366 unsigned long offset = frag->page_offset;
367
368 /* Skip unused frames from start of page */
369 offset &= ~PAGE_MASK;
370 pages += PFN_UP(offset + size);
371 }
372 return pages;
373 }
374
375 static int netvsc_get_slots(struct sk_buff *skb)
376 {
377 char *data = skb->data;
378 unsigned int offset = offset_in_page(data);
379 unsigned int len = skb_headlen(skb);
380 int slots;
381 int frag_slots;
382
383 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
384 frag_slots = count_skb_frag_slots(skb);
385 return slots + frag_slots;
386 }
387
388 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
389 {
390 u32 ret_val = TRANSPORT_INFO_NOT_IP;
391
392 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
393 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
394 goto not_ip;
395 }
396
397 *trans_off = skb_transport_offset(skb);
398
399 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
400 struct iphdr *iphdr = ip_hdr(skb);
401
402 if (iphdr->protocol == IPPROTO_TCP)
403 ret_val = TRANSPORT_INFO_IPV4_TCP;
404 else if (iphdr->protocol == IPPROTO_UDP)
405 ret_val = TRANSPORT_INFO_IPV4_UDP;
406 } else {
407 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
408 ret_val = TRANSPORT_INFO_IPV6_TCP;
409 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
410 ret_val = TRANSPORT_INFO_IPV6_UDP;
411 }
412
413 not_ip:
414 return ret_val;
415 }
416
417 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
418 {
419 struct net_device_context *net_device_ctx = netdev_priv(net);
420 struct hv_netvsc_packet *packet = NULL;
421 int ret;
422 unsigned int num_data_pgs;
423 struct rndis_message *rndis_msg;
424 struct rndis_packet *rndis_pkt;
425 u32 rndis_msg_size;
426 bool isvlan;
427 bool linear = false;
428 struct rndis_per_packet_info *ppi;
429 struct ndis_tcp_ip_checksum_info *csum_info;
430 struct ndis_tcp_lso_info *lso_info;
431 int hdr_offset;
432 u32 net_trans_info;
433 u32 hash;
434 u32 skb_length;
435 u32 pkt_sz;
436 struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
437 struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats);
438
439 /* We will atmost need two pages to describe the rndis
440 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
441 * of pages in a single packet. If skb is scattered around
442 * more pages we try linearizing it.
443 */
444
445 check_size:
446 skb_length = skb->len;
447 num_data_pgs = netvsc_get_slots(skb) + 2;
448 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) {
449 net_alert_ratelimited("packet too big: %u pages (%u bytes)\n",
450 num_data_pgs, skb->len);
451 ret = -EFAULT;
452 goto drop;
453 } else if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
454 if (skb_linearize(skb)) {
455 net_alert_ratelimited("failed to linearize skb\n");
456 ret = -ENOMEM;
457 goto drop;
458 }
459 linear = true;
460 goto check_size;
461 }
462
463 pkt_sz = sizeof(struct hv_netvsc_packet) + RNDIS_AND_PPI_SIZE;
464
465 ret = skb_cow_head(skb, pkt_sz);
466 if (ret) {
467 netdev_err(net, "unable to alloc hv_netvsc_packet\n");
468 ret = -ENOMEM;
469 goto drop;
470 }
471 /* Use the headroom for building up the packet */
472 packet = (struct hv_netvsc_packet *)skb->head;
473
474 packet->status = 0;
475 packet->xmit_more = skb->xmit_more;
476
477 packet->vlan_tci = skb->vlan_tci;
478 packet->page_buf = page_buf;
479
480 packet->q_idx = skb_get_queue_mapping(skb);
481
482 packet->is_data_pkt = true;
483 packet->total_data_buflen = skb->len;
484
485 packet->rndis_msg = (struct rndis_message *)((unsigned long)packet +
486 sizeof(struct hv_netvsc_packet));
487
488 memset(packet->rndis_msg, 0, RNDIS_AND_PPI_SIZE);
489
490 /* Set the completion routine */
491 packet->send_completion = netvsc_xmit_completion;
492 packet->send_completion_ctx = packet;
493 packet->send_completion_tid = (unsigned long)skb;
494
495 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT;
496
497 /* Add the rndis header */
498 rndis_msg = packet->rndis_msg;
499 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
500 rndis_msg->msg_len = packet->total_data_buflen;
501 rndis_pkt = &rndis_msg->msg.pkt;
502 rndis_pkt->data_offset = sizeof(struct rndis_packet);
503 rndis_pkt->data_len = packet->total_data_buflen;
504 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
505
506 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
507
508 hash = skb_get_hash_raw(skb);
509 if (hash != 0 && net->real_num_tx_queues > 1) {
510 rndis_msg_size += NDIS_HASH_PPI_SIZE;
511 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
512 NBL_HASH_VALUE);
513 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
514 }
515
516 if (isvlan) {
517 struct ndis_pkt_8021q_info *vlan;
518
519 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
520 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
521 IEEE_8021Q_INFO);
522 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
523 ppi->ppi_offset);
524 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK;
525 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >>
526 VLAN_PRIO_SHIFT;
527 }
528
529 net_trans_info = get_net_transport_info(skb, &hdr_offset);
530 if (net_trans_info == TRANSPORT_INFO_NOT_IP)
531 goto do_send;
532
533 /*
534 * Setup the sendside checksum offload only if this is not a
535 * GSO packet.
536 */
537 if (skb_is_gso(skb))
538 goto do_lso;
539
540 if ((skb->ip_summed == CHECKSUM_NONE) ||
541 (skb->ip_summed == CHECKSUM_UNNECESSARY))
542 goto do_send;
543
544 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
545 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
546 TCPIP_CHKSUM_PKTINFO);
547
548 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
549 ppi->ppi_offset);
550
551 if (net_trans_info & (INFO_IPV4 << 16))
552 csum_info->transmit.is_ipv4 = 1;
553 else
554 csum_info->transmit.is_ipv6 = 1;
555
556 if (net_trans_info & INFO_TCP) {
557 csum_info->transmit.tcp_checksum = 1;
558 csum_info->transmit.tcp_header_offset = hdr_offset;
559 } else if (net_trans_info & INFO_UDP) {
560 /* UDP checksum offload is not supported on ws2008r2.
561 * Furthermore, on ws2012 and ws2012r2, there are some
562 * issues with udp checksum offload from Linux guests.
563 * (these are host issues).
564 * For now compute the checksum here.
565 */
566 struct udphdr *uh;
567 u16 udp_len;
568
569 ret = skb_cow_head(skb, 0);
570 if (ret)
571 goto drop;
572
573 uh = udp_hdr(skb);
574 udp_len = ntohs(uh->len);
575 uh->check = 0;
576 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
577 ip_hdr(skb)->daddr,
578 udp_len, IPPROTO_UDP,
579 csum_partial(uh, udp_len, 0));
580 if (uh->check == 0)
581 uh->check = CSUM_MANGLED_0;
582
583 csum_info->transmit.udp_checksum = 0;
584 }
585 goto do_send;
586
587 do_lso:
588 rndis_msg_size += NDIS_LSO_PPI_SIZE;
589 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
590 TCP_LARGESEND_PKTINFO);
591
592 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
593 ppi->ppi_offset);
594
595 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
596 if (net_trans_info & (INFO_IPV4 << 16)) {
597 lso_info->lso_v2_transmit.ip_version =
598 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
599 ip_hdr(skb)->tot_len = 0;
600 ip_hdr(skb)->check = 0;
601 tcp_hdr(skb)->check =
602 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
603 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
604 } else {
605 lso_info->lso_v2_transmit.ip_version =
606 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
607 ipv6_hdr(skb)->payload_len = 0;
608 tcp_hdr(skb)->check =
609 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
610 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
611 }
612 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
613 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
614
615 do_send:
616 /* Start filling in the page buffers with the rndis hdr */
617 rndis_msg->msg_len += rndis_msg_size;
618 packet->total_data_buflen = rndis_msg->msg_len;
619 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
620 skb, packet);
621
622 ret = netvsc_send(net_device_ctx->device_ctx, packet);
623
624 drop:
625 if (ret == 0) {
626 u64_stats_update_begin(&tx_stats->syncp);
627 tx_stats->packets++;
628 tx_stats->bytes += skb_length;
629 u64_stats_update_end(&tx_stats->syncp);
630 } else {
631 if (ret != -EAGAIN) {
632 dev_kfree_skb_any(skb);
633 net->stats.tx_dropped++;
634 }
635 }
636
637 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
638 }
639
640 /*
641 * netvsc_linkstatus_callback - Link up/down notification
642 */
643 void netvsc_linkstatus_callback(struct hv_device *device_obj,
644 struct rndis_message *resp)
645 {
646 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
647 struct net_device *net;
648 struct net_device_context *ndev_ctx;
649 struct netvsc_device *net_device;
650 struct rndis_device *rdev;
651
652 net_device = hv_get_drvdata(device_obj);
653 rdev = net_device->extension;
654
655 switch (indicate->status) {
656 case RNDIS_STATUS_MEDIA_CONNECT:
657 rdev->link_state = false;
658 break;
659 case RNDIS_STATUS_MEDIA_DISCONNECT:
660 rdev->link_state = true;
661 break;
662 case RNDIS_STATUS_NETWORK_CHANGE:
663 rdev->link_change = true;
664 break;
665 default:
666 return;
667 }
668
669 net = net_device->ndev;
670
671 if (!net || net->reg_state != NETREG_REGISTERED)
672 return;
673
674 ndev_ctx = netdev_priv(net);
675 if (!rdev->link_state) {
676 schedule_delayed_work(&ndev_ctx->dwork, 0);
677 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
678 } else {
679 schedule_delayed_work(&ndev_ctx->dwork, 0);
680 }
681 }
682
683 /*
684 * netvsc_recv_callback - Callback when we receive a packet from the
685 * "wire" on the specified device.
686 */
687 int netvsc_recv_callback(struct hv_device *device_obj,
688 struct hv_netvsc_packet *packet,
689 struct ndis_tcp_ip_checksum_info *csum_info)
690 {
691 struct net_device *net;
692 struct net_device_context *net_device_ctx;
693 struct sk_buff *skb;
694 struct netvsc_stats *rx_stats;
695
696 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
697 if (!net || net->reg_state != NETREG_REGISTERED) {
698 packet->status = NVSP_STAT_FAIL;
699 return 0;
700 }
701 net_device_ctx = netdev_priv(net);
702 rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
703
704 /* Allocate a skb - TODO direct I/O to pages? */
705 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
706 if (unlikely(!skb)) {
707 ++net->stats.rx_dropped;
708 packet->status = NVSP_STAT_FAIL;
709 return 0;
710 }
711
712 /*
713 * Copy to skb. This copy is needed here since the memory pointed by
714 * hv_netvsc_packet cannot be deallocated
715 */
716 memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
717 packet->total_data_buflen);
718
719 skb->protocol = eth_type_trans(skb, net);
720 if (csum_info) {
721 /* We only look at the IP checksum here.
722 * Should we be dropping the packet if checksum
723 * failed? How do we deal with other checksums - TCP/UDP?
724 */
725 if (csum_info->receive.ip_checksum_succeeded)
726 skb->ip_summed = CHECKSUM_UNNECESSARY;
727 else
728 skb->ip_summed = CHECKSUM_NONE;
729 }
730
731 if (packet->vlan_tci & VLAN_TAG_PRESENT)
732 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
733 packet->vlan_tci);
734
735 skb_record_rx_queue(skb, packet->channel->
736 offermsg.offer.sub_channel_index);
737
738 u64_stats_update_begin(&rx_stats->syncp);
739 rx_stats->packets++;
740 rx_stats->bytes += packet->total_data_buflen;
741 u64_stats_update_end(&rx_stats->syncp);
742
743 /*
744 * Pass the skb back up. Network stack will deallocate the skb when it
745 * is done.
746 * TODO - use NAPI?
747 */
748 netif_rx(skb);
749
750 return 0;
751 }
752
753 static void netvsc_get_drvinfo(struct net_device *net,
754 struct ethtool_drvinfo *info)
755 {
756 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
757 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
758 }
759
760 static void netvsc_get_channels(struct net_device *net,
761 struct ethtool_channels *channel)
762 {
763 struct net_device_context *net_device_ctx = netdev_priv(net);
764 struct hv_device *dev = net_device_ctx->device_ctx;
765 struct netvsc_device *nvdev = hv_get_drvdata(dev);
766
767 if (nvdev) {
768 channel->max_combined = nvdev->max_chn;
769 channel->combined_count = nvdev->num_chn;
770 }
771 }
772
773 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
774 {
775 struct net_device_context *ndevctx = netdev_priv(ndev);
776 struct hv_device *hdev = ndevctx->device_ctx;
777 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
778 struct netvsc_device_info device_info;
779 int limit = ETH_DATA_LEN;
780 int ret = 0;
781
782 if (nvdev == NULL || nvdev->destroy)
783 return -ENODEV;
784
785 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
786 limit = NETVSC_MTU - ETH_HLEN;
787
788 if (mtu < NETVSC_MTU_MIN || mtu > limit)
789 return -EINVAL;
790
791 ret = netvsc_close(ndev);
792 if (ret)
793 goto out;
794
795 nvdev->start_remove = true;
796 rndis_filter_device_remove(hdev);
797
798 ndev->mtu = mtu;
799
800 ndevctx->device_ctx = hdev;
801 hv_set_drvdata(hdev, ndev);
802 device_info.ring_size = ring_size;
803 device_info.max_num_vrss_chns = max_num_vrss_chns;
804 rndis_filter_device_add(hdev, &device_info);
805
806 out:
807 netvsc_open(ndev);
808
809 return ret;
810 }
811
812 static struct rtnl_link_stats64 *netvsc_get_stats64(struct net_device *net,
813 struct rtnl_link_stats64 *t)
814 {
815 struct net_device_context *ndev_ctx = netdev_priv(net);
816 int cpu;
817
818 for_each_possible_cpu(cpu) {
819 struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats,
820 cpu);
821 struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats,
822 cpu);
823 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
824 unsigned int start;
825
826 do {
827 start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
828 tx_packets = tx_stats->packets;
829 tx_bytes = tx_stats->bytes;
830 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
831
832 do {
833 start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
834 rx_packets = rx_stats->packets;
835 rx_bytes = rx_stats->bytes;
836 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
837
838 t->tx_bytes += tx_bytes;
839 t->tx_packets += tx_packets;
840 t->rx_bytes += rx_bytes;
841 t->rx_packets += rx_packets;
842 }
843
844 t->tx_dropped = net->stats.tx_dropped;
845 t->tx_errors = net->stats.tx_dropped;
846
847 t->rx_dropped = net->stats.rx_dropped;
848 t->rx_errors = net->stats.rx_errors;
849
850 return t;
851 }
852
853 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
854 {
855 struct net_device_context *ndevctx = netdev_priv(ndev);
856 struct hv_device *hdev = ndevctx->device_ctx;
857 struct sockaddr *addr = p;
858 char save_adr[ETH_ALEN];
859 unsigned char save_aatype;
860 int err;
861
862 memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
863 save_aatype = ndev->addr_assign_type;
864
865 err = eth_mac_addr(ndev, p);
866 if (err != 0)
867 return err;
868
869 err = rndis_filter_set_device_mac(hdev, addr->sa_data);
870 if (err != 0) {
871 /* roll back to saved MAC */
872 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
873 ndev->addr_assign_type = save_aatype;
874 }
875
876 return err;
877 }
878
879 #ifdef CONFIG_NET_POLL_CONTROLLER
880 static void netvsc_poll_controller(struct net_device *net)
881 {
882 /* As netvsc_start_xmit() works synchronous we don't have to
883 * trigger anything here.
884 */
885 }
886 #endif
887
888 static const struct ethtool_ops ethtool_ops = {
889 .get_drvinfo = netvsc_get_drvinfo,
890 .get_link = ethtool_op_get_link,
891 .get_channels = netvsc_get_channels,
892 };
893
894 static const struct net_device_ops device_ops = {
895 .ndo_open = netvsc_open,
896 .ndo_stop = netvsc_close,
897 .ndo_start_xmit = netvsc_start_xmit,
898 .ndo_set_rx_mode = netvsc_set_multicast_list,
899 .ndo_change_mtu = netvsc_change_mtu,
900 .ndo_validate_addr = eth_validate_addr,
901 .ndo_set_mac_address = netvsc_set_mac_addr,
902 .ndo_select_queue = netvsc_select_queue,
903 .ndo_get_stats64 = netvsc_get_stats64,
904 #ifdef CONFIG_NET_POLL_CONTROLLER
905 .ndo_poll_controller = netvsc_poll_controller,
906 #endif
907 };
908
909 /*
910 * Send GARP packet to network peers after migrations.
911 * After Quick Migration, the network is not immediately operational in the
912 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
913 * another netif_notify_peers() into a delayed work, otherwise GARP packet
914 * will not be sent after quick migration, and cause network disconnection.
915 * Also, we update the carrier status here.
916 */
917 static void netvsc_link_change(struct work_struct *w)
918 {
919 struct net_device_context *ndev_ctx;
920 struct net_device *net;
921 struct netvsc_device *net_device;
922 struct rndis_device *rdev;
923 bool notify, refresh = false;
924 char *argv[] = { "/etc/init.d/network", "restart", NULL };
925 char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
926
927 rtnl_lock();
928
929 ndev_ctx = container_of(w, struct net_device_context, dwork.work);
930 net_device = hv_get_drvdata(ndev_ctx->device_ctx);
931 rdev = net_device->extension;
932 net = net_device->ndev;
933
934 if (rdev->link_state) {
935 netif_carrier_off(net);
936 notify = false;
937 } else {
938 netif_carrier_on(net);
939 notify = true;
940 if (rdev->link_change) {
941 rdev->link_change = false;
942 refresh = true;
943 }
944 }
945
946 rtnl_unlock();
947
948 if (refresh)
949 call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
950
951 if (notify)
952 netdev_notify_peers(net);
953 }
954
955 static void netvsc_free_netdev(struct net_device *netdev)
956 {
957 struct net_device_context *net_device_ctx = netdev_priv(netdev);
958
959 free_percpu(net_device_ctx->tx_stats);
960 free_percpu(net_device_ctx->rx_stats);
961 free_netdev(netdev);
962 }
963
964 static int netvsc_probe(struct hv_device *dev,
965 const struct hv_vmbus_device_id *dev_id)
966 {
967 struct net_device *net = NULL;
968 struct net_device_context *net_device_ctx;
969 struct netvsc_device_info device_info;
970 struct netvsc_device *nvdev;
971 int ret;
972 u32 max_needed_headroom;
973
974 net = alloc_etherdev_mq(sizeof(struct net_device_context),
975 num_online_cpus());
976 if (!net)
977 return -ENOMEM;
978
979 max_needed_headroom = sizeof(struct hv_netvsc_packet) +
980 RNDIS_AND_PPI_SIZE;
981
982 netif_carrier_off(net);
983
984 net_device_ctx = netdev_priv(net);
985 net_device_ctx->device_ctx = dev;
986 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
987 if (netif_msg_probe(net_device_ctx))
988 netdev_dbg(net, "netvsc msg_enable: %d\n",
989 net_device_ctx->msg_enable);
990
991 net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
992 if (!net_device_ctx->tx_stats) {
993 free_netdev(net);
994 return -ENOMEM;
995 }
996 net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
997 if (!net_device_ctx->rx_stats) {
998 free_percpu(net_device_ctx->tx_stats);
999 free_netdev(net);
1000 return -ENOMEM;
1001 }
1002
1003 hv_set_drvdata(dev, net);
1004 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1005 INIT_WORK(&net_device_ctx->work, do_set_multicast);
1006
1007 net->netdev_ops = &device_ops;
1008
1009 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
1010 NETIF_F_TSO;
1011 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
1012 NETIF_F_IP_CSUM | NETIF_F_TSO;
1013
1014 net->ethtool_ops = &ethtool_ops;
1015 SET_NETDEV_DEV(net, &dev->device);
1016
1017 /*
1018 * Request additional head room in the skb.
1019 * We will use this space to build the rndis
1020 * heaser and other state we need to maintain.
1021 */
1022 net->needed_headroom = max_needed_headroom;
1023
1024 /* Notify the netvsc driver of the new device */
1025 device_info.ring_size = ring_size;
1026 device_info.max_num_vrss_chns = max_num_vrss_chns;
1027 ret = rndis_filter_device_add(dev, &device_info);
1028 if (ret != 0) {
1029 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1030 netvsc_free_netdev(net);
1031 hv_set_drvdata(dev, NULL);
1032 return ret;
1033 }
1034 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1035
1036 nvdev = hv_get_drvdata(dev);
1037 netif_set_real_num_tx_queues(net, nvdev->num_chn);
1038 netif_set_real_num_rx_queues(net, nvdev->num_chn);
1039
1040 ret = register_netdev(net);
1041 if (ret != 0) {
1042 pr_err("Unable to register netdev.\n");
1043 rndis_filter_device_remove(dev);
1044 netvsc_free_netdev(net);
1045 } else {
1046 schedule_delayed_work(&net_device_ctx->dwork, 0);
1047 }
1048
1049 return ret;
1050 }
1051
1052 static int netvsc_remove(struct hv_device *dev)
1053 {
1054 struct net_device *net;
1055 struct net_device_context *ndev_ctx;
1056 struct netvsc_device *net_device;
1057
1058 net_device = hv_get_drvdata(dev);
1059 net = net_device->ndev;
1060
1061 if (net == NULL) {
1062 dev_err(&dev->device, "No net device to remove\n");
1063 return 0;
1064 }
1065
1066 net_device->start_remove = true;
1067
1068 ndev_ctx = netdev_priv(net);
1069 cancel_delayed_work_sync(&ndev_ctx->dwork);
1070 cancel_work_sync(&ndev_ctx->work);
1071
1072 /* Stop outbound asap */
1073 netif_tx_disable(net);
1074
1075 unregister_netdev(net);
1076
1077 /*
1078 * Call to the vsc driver to let it know that the device is being
1079 * removed
1080 */
1081 rndis_filter_device_remove(dev);
1082
1083 netvsc_free_netdev(net);
1084 return 0;
1085 }
1086
1087 static const struct hv_vmbus_device_id id_table[] = {
1088 /* Network guid */
1089 { HV_NIC_GUID, },
1090 { },
1091 };
1092
1093 MODULE_DEVICE_TABLE(vmbus, id_table);
1094
1095 /* The one and only one */
1096 static struct hv_driver netvsc_drv = {
1097 .name = KBUILD_MODNAME,
1098 .id_table = id_table,
1099 .probe = netvsc_probe,
1100 .remove = netvsc_remove,
1101 };
1102
1103 static void __exit netvsc_drv_exit(void)
1104 {
1105 vmbus_driver_unregister(&netvsc_drv);
1106 }
1107
1108 static int __init netvsc_drv_init(void)
1109 {
1110 if (ring_size < RING_SIZE_MIN) {
1111 ring_size = RING_SIZE_MIN;
1112 pr_info("Increased ring_size to %d (min allowed)\n",
1113 ring_size);
1114 }
1115 return vmbus_driver_register(&netvsc_drv);
1116 }
1117
1118 MODULE_LICENSE("GPL");
1119 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1120
1121 module_init(netvsc_drv_init);
1122 module_exit(netvsc_drv_exit);
Linux with added FPC-III support