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[deliverable/linux.git] / drivers / net / hyperv / netvsc_drv.c
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 static int ring_size = 128;
47 module_param(ring_size, int, S_IRUGO);
48 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
49
50 static int max_num_vrss_chns = 8;
51
52 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
53 NETIF_MSG_LINK | NETIF_MSG_IFUP |
54 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
55 NETIF_MSG_TX_ERR;
56
57 static int debug = -1;
58 module_param(debug, int, S_IRUGO);
59 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
60
61 static void do_set_multicast(struct work_struct *w)
62 {
63 struct net_device_context *ndevctx =
64 container_of(w, struct net_device_context, work);
65 struct netvsc_device *nvdev;
66 struct rndis_device *rdev;
67
68 nvdev = hv_get_drvdata(ndevctx->device_ctx);
69 if (nvdev == NULL || nvdev->ndev == NULL)
70 return;
71
72 rdev = nvdev->extension;
73 if (rdev == NULL)
74 return;
75
76 if (nvdev->ndev->flags & IFF_PROMISC)
77 rndis_filter_set_packet_filter(rdev,
78 NDIS_PACKET_TYPE_PROMISCUOUS);
79 else
80 rndis_filter_set_packet_filter(rdev,
81 NDIS_PACKET_TYPE_BROADCAST |
82 NDIS_PACKET_TYPE_ALL_MULTICAST |
83 NDIS_PACKET_TYPE_DIRECTED);
84 }
85
86 static void netvsc_set_multicast_list(struct net_device *net)
87 {
88 struct net_device_context *net_device_ctx = netdev_priv(net);
89
90 schedule_work(&net_device_ctx->work);
91 }
92
93 static int netvsc_open(struct net_device *net)
94 {
95 struct net_device_context *net_device_ctx = netdev_priv(net);
96 struct hv_device *device_obj = net_device_ctx->device_ctx;
97 struct netvsc_device *nvdev;
98 struct rndis_device *rdev;
99 int ret = 0;
100
101 netif_carrier_off(net);
102
103 /* Open up the device */
104 ret = rndis_filter_open(device_obj);
105 if (ret != 0) {
106 netdev_err(net, "unable to open device (ret %d).\n", ret);
107 return ret;
108 }
109
110 netif_tx_wake_all_queues(net);
111
112 nvdev = hv_get_drvdata(device_obj);
113 rdev = nvdev->extension;
114 if (!rdev->link_state)
115 netif_carrier_on(net);
116
117 return ret;
118 }
119
120 static int netvsc_close(struct net_device *net)
121 {
122 struct net_device_context *net_device_ctx = netdev_priv(net);
123 struct hv_device *device_obj = net_device_ctx->device_ctx;
124 struct netvsc_device *nvdev = hv_get_drvdata(device_obj);
125 int ret;
126 u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
127 struct vmbus_channel *chn;
128
129 netif_tx_disable(net);
130
131 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
132 cancel_work_sync(&net_device_ctx->work);
133 ret = rndis_filter_close(device_obj);
134 if (ret != 0) {
135 netdev_err(net, "unable to close device (ret %d).\n", ret);
136 return ret;
137 }
138
139 /* Ensure pending bytes in ring are read */
140 while (true) {
141 aread = 0;
142 for (i = 0; i < nvdev->num_chn; i++) {
143 chn = nvdev->chn_table[i];
144 if (!chn)
145 continue;
146
147 hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
148 &awrite);
149
150 if (aread)
151 break;
152
153 hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
154 &awrite);
155
156 if (aread)
157 break;
158 }
159
160 retry++;
161 if (retry > retry_max || aread == 0)
162 break;
163
164 msleep(msec);
165
166 if (msec < 1000)
167 msec *= 2;
168 }
169
170 if (aread) {
171 netdev_err(net, "Ring buffer not empty after closing rndis\n");
172 ret = -ETIMEDOUT;
173 }
174
175 return ret;
176 }
177
178 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
179 int pkt_type)
180 {
181 struct rndis_packet *rndis_pkt;
182 struct rndis_per_packet_info *ppi;
183
184 rndis_pkt = &msg->msg.pkt;
185 rndis_pkt->data_offset += ppi_size;
186
187 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
188 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
189
190 ppi->size = ppi_size;
191 ppi->type = pkt_type;
192 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
193
194 rndis_pkt->per_pkt_info_len += ppi_size;
195
196 return ppi;
197 }
198
199 union sub_key {
200 u64 k;
201 struct {
202 u8 pad[3];
203 u8 kb;
204 u32 ka;
205 };
206 };
207
208 /* Toeplitz hash function
209 * data: network byte order
210 * return: host byte order
211 */
212 static u32 comp_hash(u8 *key, int klen, void *data, int dlen)
213 {
214 union sub_key subk;
215 int k_next = 4;
216 u8 dt;
217 int i, j;
218 u32 ret = 0;
219
220 subk.k = 0;
221 subk.ka = ntohl(*(u32 *)key);
222
223 for (i = 0; i < dlen; i++) {
224 subk.kb = key[k_next];
225 k_next = (k_next + 1) % klen;
226 dt = ((u8 *)data)[i];
227 for (j = 0; j < 8; j++) {
228 if (dt & 0x80)
229 ret ^= subk.ka;
230 dt <<= 1;
231 subk.k <<= 1;
232 }
233 }
234
235 return ret;
236 }
237
238 static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
239 {
240 struct flow_keys flow;
241 int data_len;
242
243 if (!skb_flow_dissect_flow_keys(skb, &flow, 0) ||
244 !(flow.basic.n_proto == htons(ETH_P_IP) ||
245 flow.basic.n_proto == htons(ETH_P_IPV6)))
246 return false;
247
248 if (flow.basic.ip_proto == IPPROTO_TCP)
249 data_len = 12;
250 else
251 data_len = 8;
252
253 *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len);
254
255 return true;
256 }
257
258 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
259 void *accel_priv, select_queue_fallback_t fallback)
260 {
261 struct net_device_context *net_device_ctx = netdev_priv(ndev);
262 struct hv_device *hdev = net_device_ctx->device_ctx;
263 struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev);
264 u32 hash;
265 u16 q_idx = 0;
266
267 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
268 return 0;
269
270 if (netvsc_set_hash(&hash, skb)) {
271 q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
272 ndev->real_num_tx_queues;
273 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
274 }
275
276 if (!nvsc_dev->chn_table[q_idx])
277 q_idx = 0;
278
279 return q_idx;
280 }
281
282 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
283 struct hv_page_buffer *pb)
284 {
285 int j = 0;
286
287 /* Deal with compund pages by ignoring unused part
288 * of the page.
289 */
290 page += (offset >> PAGE_SHIFT);
291 offset &= ~PAGE_MASK;
292
293 while (len > 0) {
294 unsigned long bytes;
295
296 bytes = PAGE_SIZE - offset;
297 if (bytes > len)
298 bytes = len;
299 pb[j].pfn = page_to_pfn(page);
300 pb[j].offset = offset;
301 pb[j].len = bytes;
302
303 offset += bytes;
304 len -= bytes;
305
306 if (offset == PAGE_SIZE && len) {
307 page++;
308 offset = 0;
309 j++;
310 }
311 }
312
313 return j + 1;
314 }
315
316 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
317 struct hv_netvsc_packet *packet,
318 struct hv_page_buffer **page_buf)
319 {
320 struct hv_page_buffer *pb = *page_buf;
321 u32 slots_used = 0;
322 char *data = skb->data;
323 int frags = skb_shinfo(skb)->nr_frags;
324 int i;
325
326 /* The packet is laid out thus:
327 * 1. hdr: RNDIS header and PPI
328 * 2. skb linear data
329 * 3. skb fragment data
330 */
331 if (hdr != NULL)
332 slots_used += fill_pg_buf(virt_to_page(hdr),
333 offset_in_page(hdr),
334 len, &pb[slots_used]);
335
336 packet->rmsg_size = len;
337 packet->rmsg_pgcnt = slots_used;
338
339 slots_used += fill_pg_buf(virt_to_page(data),
340 offset_in_page(data),
341 skb_headlen(skb), &pb[slots_used]);
342
343 for (i = 0; i < frags; i++) {
344 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
345
346 slots_used += fill_pg_buf(skb_frag_page(frag),
347 frag->page_offset,
348 skb_frag_size(frag), &pb[slots_used]);
349 }
350 return slots_used;
351 }
352
353 static int count_skb_frag_slots(struct sk_buff *skb)
354 {
355 int i, frags = skb_shinfo(skb)->nr_frags;
356 int pages = 0;
357
358 for (i = 0; i < frags; i++) {
359 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
360 unsigned long size = skb_frag_size(frag);
361 unsigned long offset = frag->page_offset;
362
363 /* Skip unused frames from start of page */
364 offset &= ~PAGE_MASK;
365 pages += PFN_UP(offset + size);
366 }
367 return pages;
368 }
369
370 static int netvsc_get_slots(struct sk_buff *skb)
371 {
372 char *data = skb->data;
373 unsigned int offset = offset_in_page(data);
374 unsigned int len = skb_headlen(skb);
375 int slots;
376 int frag_slots;
377
378 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
379 frag_slots = count_skb_frag_slots(skb);
380 return slots + frag_slots;
381 }
382
383 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
384 {
385 u32 ret_val = TRANSPORT_INFO_NOT_IP;
386
387 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
388 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
389 goto not_ip;
390 }
391
392 *trans_off = skb_transport_offset(skb);
393
394 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
395 struct iphdr *iphdr = ip_hdr(skb);
396
397 if (iphdr->protocol == IPPROTO_TCP)
398 ret_val = TRANSPORT_INFO_IPV4_TCP;
399 else if (iphdr->protocol == IPPROTO_UDP)
400 ret_val = TRANSPORT_INFO_IPV4_UDP;
401 } else {
402 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
403 ret_val = TRANSPORT_INFO_IPV6_TCP;
404 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
405 ret_val = TRANSPORT_INFO_IPV6_UDP;
406 }
407
408 not_ip:
409 return ret_val;
410 }
411
412 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
413 {
414 struct net_device_context *net_device_ctx = netdev_priv(net);
415 struct hv_netvsc_packet *packet = NULL;
416 int ret;
417 unsigned int num_data_pgs;
418 struct rndis_message *rndis_msg;
419 struct rndis_packet *rndis_pkt;
420 u32 rndis_msg_size;
421 bool isvlan;
422 bool linear = false;
423 struct rndis_per_packet_info *ppi;
424 struct ndis_tcp_ip_checksum_info *csum_info;
425 struct ndis_tcp_lso_info *lso_info;
426 int hdr_offset;
427 u32 net_trans_info;
428 u32 hash;
429 u32 skb_length;
430 struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
431 struct hv_page_buffer *pb = page_buf;
432 struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats);
433
434 /* We will atmost need two pages to describe the rndis
435 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
436 * of pages in a single packet. If skb is scattered around
437 * more pages we try linearizing it.
438 */
439
440 check_size:
441 skb_length = skb->len;
442 num_data_pgs = netvsc_get_slots(skb) + 2;
443 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) {
444 net_alert_ratelimited("packet too big: %u pages (%u bytes)\n",
445 num_data_pgs, skb->len);
446 ret = -EFAULT;
447 goto drop;
448 } else if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
449 if (skb_linearize(skb)) {
450 net_alert_ratelimited("failed to linearize skb\n");
451 ret = -ENOMEM;
452 goto drop;
453 }
454 linear = true;
455 goto check_size;
456 }
457
458 /*
459 * Place the rndis header in the skb head room and
460 * the skb->cb will be used for hv_netvsc_packet
461 * structure.
462 */
463 ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
464 if (ret) {
465 netdev_err(net, "unable to alloc hv_netvsc_packet\n");
466 ret = -ENOMEM;
467 goto drop;
468 }
469 /* Use the skb control buffer for building up the packet */
470 BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
471 FIELD_SIZEOF(struct sk_buff, cb));
472 packet = (struct hv_netvsc_packet *)skb->cb;
473
474 packet->status = 0;
475 packet->xmit_more = skb->xmit_more;
476
477 packet->vlan_tci = skb->vlan_tci;
478
479 packet->q_idx = skb_get_queue_mapping(skb);
480
481 packet->is_data_pkt = true;
482 packet->total_data_buflen = skb->len;
483
484 rndis_msg = (struct rndis_message *)skb->head;
485
486 memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
487
488 /* Set the completion routine */
489 packet->completion_func = 1;
490
491 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT;
492
493 /* Add the rndis header */
494 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
495 rndis_msg->msg_len = packet->total_data_buflen;
496 rndis_pkt = &rndis_msg->msg.pkt;
497 rndis_pkt->data_offset = sizeof(struct rndis_packet);
498 rndis_pkt->data_len = packet->total_data_buflen;
499 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
500
501 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
502
503 hash = skb_get_hash_raw(skb);
504 if (hash != 0 && net->real_num_tx_queues > 1) {
505 rndis_msg_size += NDIS_HASH_PPI_SIZE;
506 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
507 NBL_HASH_VALUE);
508 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
509 }
510
511 if (isvlan) {
512 struct ndis_pkt_8021q_info *vlan;
513
514 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
515 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
516 IEEE_8021Q_INFO);
517 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
518 ppi->ppi_offset);
519 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK;
520 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >>
521 VLAN_PRIO_SHIFT;
522 }
523
524 net_trans_info = get_net_transport_info(skb, &hdr_offset);
525 if (net_trans_info == TRANSPORT_INFO_NOT_IP)
526 goto do_send;
527
528 /*
529 * Setup the sendside checksum offload only if this is not a
530 * GSO packet.
531 */
532 if (skb_is_gso(skb))
533 goto do_lso;
534
535 if ((skb->ip_summed == CHECKSUM_NONE) ||
536 (skb->ip_summed == CHECKSUM_UNNECESSARY))
537 goto do_send;
538
539 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
540 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
541 TCPIP_CHKSUM_PKTINFO);
542
543 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
544 ppi->ppi_offset);
545
546 if (net_trans_info & (INFO_IPV4 << 16))
547 csum_info->transmit.is_ipv4 = 1;
548 else
549 csum_info->transmit.is_ipv6 = 1;
550
551 if (net_trans_info & INFO_TCP) {
552 csum_info->transmit.tcp_checksum = 1;
553 csum_info->transmit.tcp_header_offset = hdr_offset;
554 } else if (net_trans_info & INFO_UDP) {
555 /* UDP checksum offload is not supported on ws2008r2.
556 * Furthermore, on ws2012 and ws2012r2, there are some
557 * issues with udp checksum offload from Linux guests.
558 * (these are host issues).
559 * For now compute the checksum here.
560 */
561 struct udphdr *uh;
562 u16 udp_len;
563
564 ret = skb_cow_head(skb, 0);
565 if (ret)
566 goto drop;
567
568 uh = udp_hdr(skb);
569 udp_len = ntohs(uh->len);
570 uh->check = 0;
571 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
572 ip_hdr(skb)->daddr,
573 udp_len, IPPROTO_UDP,
574 csum_partial(uh, udp_len, 0));
575 if (uh->check == 0)
576 uh->check = CSUM_MANGLED_0;
577
578 csum_info->transmit.udp_checksum = 0;
579 }
580 goto do_send;
581
582 do_lso:
583 rndis_msg_size += NDIS_LSO_PPI_SIZE;
584 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
585 TCP_LARGESEND_PKTINFO);
586
587 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
588 ppi->ppi_offset);
589
590 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
591 if (net_trans_info & (INFO_IPV4 << 16)) {
592 lso_info->lso_v2_transmit.ip_version =
593 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
594 ip_hdr(skb)->tot_len = 0;
595 ip_hdr(skb)->check = 0;
596 tcp_hdr(skb)->check =
597 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
598 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
599 } else {
600 lso_info->lso_v2_transmit.ip_version =
601 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
602 ipv6_hdr(skb)->payload_len = 0;
603 tcp_hdr(skb)->check =
604 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
605 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
606 }
607 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
608 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
609
610 do_send:
611 /* Start filling in the page buffers with the rndis hdr */
612 rndis_msg->msg_len += rndis_msg_size;
613 packet->total_data_buflen = rndis_msg->msg_len;
614 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
615 skb, packet, &pb);
616
617 ret = netvsc_send(net_device_ctx->device_ctx, packet,
618 rndis_msg, &pb, skb);
619
620 drop:
621 if (ret == 0) {
622 u64_stats_update_begin(&tx_stats->syncp);
623 tx_stats->packets++;
624 tx_stats->bytes += skb_length;
625 u64_stats_update_end(&tx_stats->syncp);
626 } else {
627 if (ret != -EAGAIN) {
628 dev_kfree_skb_any(skb);
629 net->stats.tx_dropped++;
630 }
631 }
632
633 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
634 }
635
636 /*
637 * netvsc_linkstatus_callback - Link up/down notification
638 */
639 void netvsc_linkstatus_callback(struct hv_device *device_obj,
640 struct rndis_message *resp)
641 {
642 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
643 struct net_device *net;
644 struct net_device_context *ndev_ctx;
645 struct netvsc_device *net_device;
646 struct netvsc_reconfig *event;
647 unsigned long flags;
648
649 /* Handle link change statuses only */
650 if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
651 indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
652 indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
653 return;
654
655 net_device = hv_get_drvdata(device_obj);
656 net = net_device->ndev;
657
658 if (!net || net->reg_state != NETREG_REGISTERED)
659 return;
660
661 ndev_ctx = netdev_priv(net);
662
663 event = kzalloc(sizeof(*event), GFP_ATOMIC);
664 if (!event)
665 return;
666 event->event = indicate->status;
667
668 spin_lock_irqsave(&ndev_ctx->lock, flags);
669 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
670 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
671
672 schedule_delayed_work(&ndev_ctx->dwork, 0);
673 }
674
675 /*
676 * netvsc_recv_callback - Callback when we receive a packet from the
677 * "wire" on the specified device.
678 */
679 int netvsc_recv_callback(struct hv_device *device_obj,
680 struct hv_netvsc_packet *packet,
681 void **data,
682 struct ndis_tcp_ip_checksum_info *csum_info,
683 struct vmbus_channel *channel)
684 {
685 struct net_device *net;
686 struct net_device_context *net_device_ctx;
687 struct sk_buff *skb;
688 struct netvsc_stats *rx_stats;
689
690 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
691 if (!net || net->reg_state != NETREG_REGISTERED) {
692 packet->status = NVSP_STAT_FAIL;
693 return 0;
694 }
695 net_device_ctx = netdev_priv(net);
696 rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
697
698 /* Allocate a skb - TODO direct I/O to pages? */
699 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
700 if (unlikely(!skb)) {
701 ++net->stats.rx_dropped;
702 packet->status = NVSP_STAT_FAIL;
703 return 0;
704 }
705
706 /*
707 * Copy to skb. This copy is needed here since the memory pointed by
708 * hv_netvsc_packet cannot be deallocated
709 */
710 memcpy(skb_put(skb, packet->total_data_buflen), *data,
711 packet->total_data_buflen);
712
713 skb->protocol = eth_type_trans(skb, net);
714 if (csum_info) {
715 /* We only look at the IP checksum here.
716 * Should we be dropping the packet if checksum
717 * failed? How do we deal with other checksums - TCP/UDP?
718 */
719 if (csum_info->receive.ip_checksum_succeeded)
720 skb->ip_summed = CHECKSUM_UNNECESSARY;
721 else
722 skb->ip_summed = CHECKSUM_NONE;
723 }
724
725 if (packet->vlan_tci & VLAN_TAG_PRESENT)
726 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
727 packet->vlan_tci);
728
729 skb_record_rx_queue(skb, channel->
730 offermsg.offer.sub_channel_index);
731
732 u64_stats_update_begin(&rx_stats->syncp);
733 rx_stats->packets++;
734 rx_stats->bytes += packet->total_data_buflen;
735 u64_stats_update_end(&rx_stats->syncp);
736
737 /*
738 * Pass the skb back up. Network stack will deallocate the skb when it
739 * is done.
740 * TODO - use NAPI?
741 */
742 netif_rx(skb);
743
744 return 0;
745 }
746
747 static void netvsc_get_drvinfo(struct net_device *net,
748 struct ethtool_drvinfo *info)
749 {
750 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
751 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
752 }
753
754 static void netvsc_get_channels(struct net_device *net,
755 struct ethtool_channels *channel)
756 {
757 struct net_device_context *net_device_ctx = netdev_priv(net);
758 struct hv_device *dev = net_device_ctx->device_ctx;
759 struct netvsc_device *nvdev = hv_get_drvdata(dev);
760
761 if (nvdev) {
762 channel->max_combined = nvdev->max_chn;
763 channel->combined_count = nvdev->num_chn;
764 }
765 }
766
767 static int netvsc_set_channels(struct net_device *net,
768 struct ethtool_channels *channels)
769 {
770 struct net_device_context *net_device_ctx = netdev_priv(net);
771 struct hv_device *dev = net_device_ctx->device_ctx;
772 struct netvsc_device *nvdev = hv_get_drvdata(dev);
773 struct netvsc_device_info device_info;
774 u32 num_chn;
775 u32 max_chn;
776 int ret = 0;
777 bool recovering = false;
778
779 if (!nvdev || nvdev->destroy)
780 return -ENODEV;
781
782 num_chn = nvdev->num_chn;
783 max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
784
785 if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) {
786 pr_info("vRSS unsupported before NVSP Version 5\n");
787 return -EINVAL;
788 }
789
790 /* We do not support rx, tx, or other */
791 if (!channels ||
792 channels->rx_count ||
793 channels->tx_count ||
794 channels->other_count ||
795 (channels->combined_count < 1))
796 return -EINVAL;
797
798 if (channels->combined_count > max_chn) {
799 pr_info("combined channels too high, using %d\n", max_chn);
800 channels->combined_count = max_chn;
801 }
802
803 ret = netvsc_close(net);
804 if (ret)
805 goto out;
806
807 do_set:
808 nvdev->start_remove = true;
809 rndis_filter_device_remove(dev);
810
811 nvdev->num_chn = channels->combined_count;
812
813 net_device_ctx->device_ctx = dev;
814 hv_set_drvdata(dev, net);
815
816 memset(&device_info, 0, sizeof(device_info));
817 device_info.num_chn = nvdev->num_chn; /* passed to RNDIS */
818 device_info.ring_size = ring_size;
819 device_info.max_num_vrss_chns = max_num_vrss_chns;
820
821 ret = rndis_filter_device_add(dev, &device_info);
822 if (ret) {
823 if (recovering) {
824 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
825 return ret;
826 }
827 goto recover;
828 }
829
830 nvdev = hv_get_drvdata(dev);
831
832 ret = netif_set_real_num_tx_queues(net, nvdev->num_chn);
833 if (ret) {
834 if (recovering) {
835 netdev_err(net, "could not set tx queue count (ret %d)\n", ret);
836 return ret;
837 }
838 goto recover;
839 }
840
841 ret = netif_set_real_num_rx_queues(net, nvdev->num_chn);
842 if (ret) {
843 if (recovering) {
844 netdev_err(net, "could not set rx queue count (ret %d)\n", ret);
845 return ret;
846 }
847 goto recover;
848 }
849
850 out:
851 netvsc_open(net);
852
853 return ret;
854
855 recover:
856 /* If the above failed, we attempt to recover through the same
857 * process but with the original number of channels.
858 */
859 netdev_err(net, "could not set channels, recovering\n");
860 recovering = true;
861 channels->combined_count = num_chn;
862 goto do_set;
863 }
864
865 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
866 {
867 struct net_device_context *ndevctx = netdev_priv(ndev);
868 struct hv_device *hdev = ndevctx->device_ctx;
869 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
870 struct netvsc_device_info device_info;
871 int limit = ETH_DATA_LEN;
872 int ret = 0;
873
874 if (nvdev == NULL || nvdev->destroy)
875 return -ENODEV;
876
877 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
878 limit = NETVSC_MTU - ETH_HLEN;
879
880 if (mtu < NETVSC_MTU_MIN || mtu > limit)
881 return -EINVAL;
882
883 ret = netvsc_close(ndev);
884 if (ret)
885 goto out;
886
887 nvdev->start_remove = true;
888 rndis_filter_device_remove(hdev);
889
890 ndev->mtu = mtu;
891
892 ndevctx->device_ctx = hdev;
893 hv_set_drvdata(hdev, ndev);
894
895 memset(&device_info, 0, sizeof(device_info));
896 device_info.ring_size = ring_size;
897 device_info.num_chn = nvdev->num_chn;
898 device_info.max_num_vrss_chns = max_num_vrss_chns;
899 rndis_filter_device_add(hdev, &device_info);
900
901 out:
902 netvsc_open(ndev);
903
904 return ret;
905 }
906
907 static struct rtnl_link_stats64 *netvsc_get_stats64(struct net_device *net,
908 struct rtnl_link_stats64 *t)
909 {
910 struct net_device_context *ndev_ctx = netdev_priv(net);
911 int cpu;
912
913 for_each_possible_cpu(cpu) {
914 struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats,
915 cpu);
916 struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats,
917 cpu);
918 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
919 unsigned int start;
920
921 do {
922 start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
923 tx_packets = tx_stats->packets;
924 tx_bytes = tx_stats->bytes;
925 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
926
927 do {
928 start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
929 rx_packets = rx_stats->packets;
930 rx_bytes = rx_stats->bytes;
931 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
932
933 t->tx_bytes += tx_bytes;
934 t->tx_packets += tx_packets;
935 t->rx_bytes += rx_bytes;
936 t->rx_packets += rx_packets;
937 }
938
939 t->tx_dropped = net->stats.tx_dropped;
940 t->tx_errors = net->stats.tx_dropped;
941
942 t->rx_dropped = net->stats.rx_dropped;
943 t->rx_errors = net->stats.rx_errors;
944
945 return t;
946 }
947
948 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
949 {
950 struct net_device_context *ndevctx = netdev_priv(ndev);
951 struct hv_device *hdev = ndevctx->device_ctx;
952 struct sockaddr *addr = p;
953 char save_adr[ETH_ALEN];
954 unsigned char save_aatype;
955 int err;
956
957 memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
958 save_aatype = ndev->addr_assign_type;
959
960 err = eth_mac_addr(ndev, p);
961 if (err != 0)
962 return err;
963
964 err = rndis_filter_set_device_mac(hdev, addr->sa_data);
965 if (err != 0) {
966 /* roll back to saved MAC */
967 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
968 ndev->addr_assign_type = save_aatype;
969 }
970
971 return err;
972 }
973
974 #ifdef CONFIG_NET_POLL_CONTROLLER
975 static void netvsc_poll_controller(struct net_device *net)
976 {
977 /* As netvsc_start_xmit() works synchronous we don't have to
978 * trigger anything here.
979 */
980 }
981 #endif
982
983 static const struct ethtool_ops ethtool_ops = {
984 .get_drvinfo = netvsc_get_drvinfo,
985 .get_link = ethtool_op_get_link,
986 .get_channels = netvsc_get_channels,
987 .set_channels = netvsc_set_channels,
988 };
989
990 static const struct net_device_ops device_ops = {
991 .ndo_open = netvsc_open,
992 .ndo_stop = netvsc_close,
993 .ndo_start_xmit = netvsc_start_xmit,
994 .ndo_set_rx_mode = netvsc_set_multicast_list,
995 .ndo_change_mtu = netvsc_change_mtu,
996 .ndo_validate_addr = eth_validate_addr,
997 .ndo_set_mac_address = netvsc_set_mac_addr,
998 .ndo_select_queue = netvsc_select_queue,
999 .ndo_get_stats64 = netvsc_get_stats64,
1000 #ifdef CONFIG_NET_POLL_CONTROLLER
1001 .ndo_poll_controller = netvsc_poll_controller,
1002 #endif
1003 };
1004
1005 /*
1006 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1007 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1008 * present send GARP packet to network peers with netif_notify_peers().
1009 */
1010 static void netvsc_link_change(struct work_struct *w)
1011 {
1012 struct net_device_context *ndev_ctx;
1013 struct net_device *net;
1014 struct netvsc_device *net_device;
1015 struct rndis_device *rdev;
1016 struct netvsc_reconfig *event = NULL;
1017 bool notify = false, reschedule = false;
1018 unsigned long flags, next_reconfig, delay;
1019
1020 ndev_ctx = container_of(w, struct net_device_context, dwork.work);
1021 net_device = hv_get_drvdata(ndev_ctx->device_ctx);
1022 rdev = net_device->extension;
1023 net = net_device->ndev;
1024
1025 next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1026 if (time_is_after_jiffies(next_reconfig)) {
1027 /* link_watch only sends one notification with current state
1028 * per second, avoid doing reconfig more frequently. Handle
1029 * wrap around.
1030 */
1031 delay = next_reconfig - jiffies;
1032 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1033 schedule_delayed_work(&ndev_ctx->dwork, delay);
1034 return;
1035 }
1036 ndev_ctx->last_reconfig = jiffies;
1037
1038 spin_lock_irqsave(&ndev_ctx->lock, flags);
1039 if (!list_empty(&ndev_ctx->reconfig_events)) {
1040 event = list_first_entry(&ndev_ctx->reconfig_events,
1041 struct netvsc_reconfig, list);
1042 list_del(&event->list);
1043 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1044 }
1045 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1046
1047 if (!event)
1048 return;
1049
1050 rtnl_lock();
1051
1052 switch (event->event) {
1053 /* Only the following events are possible due to the check in
1054 * netvsc_linkstatus_callback()
1055 */
1056 case RNDIS_STATUS_MEDIA_CONNECT:
1057 if (rdev->link_state) {
1058 rdev->link_state = false;
1059 netif_carrier_on(net);
1060 netif_tx_wake_all_queues(net);
1061 } else {
1062 notify = true;
1063 }
1064 kfree(event);
1065 break;
1066 case RNDIS_STATUS_MEDIA_DISCONNECT:
1067 if (!rdev->link_state) {
1068 rdev->link_state = true;
1069 netif_carrier_off(net);
1070 netif_tx_stop_all_queues(net);
1071 }
1072 kfree(event);
1073 break;
1074 case RNDIS_STATUS_NETWORK_CHANGE:
1075 /* Only makes sense if carrier is present */
1076 if (!rdev->link_state) {
1077 rdev->link_state = true;
1078 netif_carrier_off(net);
1079 netif_tx_stop_all_queues(net);
1080 event->event = RNDIS_STATUS_MEDIA_CONNECT;
1081 spin_lock_irqsave(&ndev_ctx->lock, flags);
1082 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
1083 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1084 reschedule = true;
1085 }
1086 break;
1087 }
1088
1089 rtnl_unlock();
1090
1091 if (notify)
1092 netdev_notify_peers(net);
1093
1094 /* link_watch only sends one notification with current state per
1095 * second, handle next reconfig event in 2 seconds.
1096 */
1097 if (reschedule)
1098 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1099 }
1100
1101 static void netvsc_free_netdev(struct net_device *netdev)
1102 {
1103 struct net_device_context *net_device_ctx = netdev_priv(netdev);
1104
1105 free_percpu(net_device_ctx->tx_stats);
1106 free_percpu(net_device_ctx->rx_stats);
1107 free_netdev(netdev);
1108 }
1109
1110 static int netvsc_probe(struct hv_device *dev,
1111 const struct hv_vmbus_device_id *dev_id)
1112 {
1113 struct net_device *net = NULL;
1114 struct net_device_context *net_device_ctx;
1115 struct netvsc_device_info device_info;
1116 struct netvsc_device *nvdev;
1117 int ret;
1118
1119 net = alloc_etherdev_mq(sizeof(struct net_device_context),
1120 num_online_cpus());
1121 if (!net)
1122 return -ENOMEM;
1123
1124 netif_carrier_off(net);
1125
1126 net_device_ctx = netdev_priv(net);
1127 net_device_ctx->device_ctx = dev;
1128 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1129 if (netif_msg_probe(net_device_ctx))
1130 netdev_dbg(net, "netvsc msg_enable: %d\n",
1131 net_device_ctx->msg_enable);
1132
1133 net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1134 if (!net_device_ctx->tx_stats) {
1135 free_netdev(net);
1136 return -ENOMEM;
1137 }
1138 net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1139 if (!net_device_ctx->rx_stats) {
1140 free_percpu(net_device_ctx->tx_stats);
1141 free_netdev(net);
1142 return -ENOMEM;
1143 }
1144
1145 hv_set_drvdata(dev, net);
1146 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1147 INIT_WORK(&net_device_ctx->work, do_set_multicast);
1148
1149 spin_lock_init(&net_device_ctx->lock);
1150 INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1151
1152 net->netdev_ops = &device_ops;
1153
1154 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
1155 NETIF_F_TSO;
1156 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
1157 NETIF_F_IP_CSUM | NETIF_F_TSO;
1158
1159 net->ethtool_ops = &ethtool_ops;
1160 SET_NETDEV_DEV(net, &dev->device);
1161
1162 /* Notify the netvsc driver of the new device */
1163 memset(&device_info, 0, sizeof(device_info));
1164 device_info.ring_size = ring_size;
1165 device_info.max_num_vrss_chns = max_num_vrss_chns;
1166 ret = rndis_filter_device_add(dev, &device_info);
1167 if (ret != 0) {
1168 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1169 netvsc_free_netdev(net);
1170 hv_set_drvdata(dev, NULL);
1171 return ret;
1172 }
1173 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1174
1175 nvdev = hv_get_drvdata(dev);
1176 netif_set_real_num_tx_queues(net, nvdev->num_chn);
1177 netif_set_real_num_rx_queues(net, nvdev->num_chn);
1178
1179 ret = register_netdev(net);
1180 if (ret != 0) {
1181 pr_err("Unable to register netdev.\n");
1182 rndis_filter_device_remove(dev);
1183 netvsc_free_netdev(net);
1184 }
1185
1186 return ret;
1187 }
1188
1189 static int netvsc_remove(struct hv_device *dev)
1190 {
1191 struct net_device *net;
1192 struct net_device_context *ndev_ctx;
1193 struct netvsc_device *net_device;
1194
1195 net_device = hv_get_drvdata(dev);
1196 net = net_device->ndev;
1197
1198 if (net == NULL) {
1199 dev_err(&dev->device, "No net device to remove\n");
1200 return 0;
1201 }
1202
1203 net_device->start_remove = true;
1204
1205 ndev_ctx = netdev_priv(net);
1206 cancel_delayed_work_sync(&ndev_ctx->dwork);
1207 cancel_work_sync(&ndev_ctx->work);
1208
1209 /* Stop outbound asap */
1210 netif_tx_disable(net);
1211
1212 unregister_netdev(net);
1213
1214 /*
1215 * Call to the vsc driver to let it know that the device is being
1216 * removed
1217 */
1218 rndis_filter_device_remove(dev);
1219
1220 netvsc_free_netdev(net);
1221 return 0;
1222 }
1223
1224 static const struct hv_vmbus_device_id id_table[] = {
1225 /* Network guid */
1226 { HV_NIC_GUID, },
1227 { },
1228 };
1229
1230 MODULE_DEVICE_TABLE(vmbus, id_table);
1231
1232 /* The one and only one */
1233 static struct hv_driver netvsc_drv = {
1234 .name = KBUILD_MODNAME,
1235 .id_table = id_table,
1236 .probe = netvsc_probe,
1237 .remove = netvsc_remove,
1238 };
1239
1240 static void __exit netvsc_drv_exit(void)
1241 {
1242 vmbus_driver_unregister(&netvsc_drv);
1243 }
1244
1245 static int __init netvsc_drv_init(void)
1246 {
1247 if (ring_size < RING_SIZE_MIN) {
1248 ring_size = RING_SIZE_MIN;
1249 pr_info("Increased ring_size to %d (min allowed)\n",
1250 ring_size);
1251 }
1252 return vmbus_driver_register(&netvsc_drv);
1253 }
1254
1255 MODULE_LICENSE("GPL");
1256 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1257
1258 module_init(netvsc_drv_init);
1259 module_exit(netvsc_drv_exit);
Linux kernel - Deliverables
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