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