blob: 3c7991717da0c66ffd6b5d653ce2ccbbd2831dcf [file] [log] [blame]
Rusty Russell48925e32009-09-24 09:59:20 -06001/* A network driver using virtio.
Rusty Russell296f96f2007-10-22 11:03:37 +10002 *
3 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19//#define DEBUG
20#include <linux/netdevice.h>
21#include <linux/etherdevice.h>
Herbert Xua9ea3fc2008-04-18 11:21:42 +080022#include <linux/ethtool.h>
Rusty Russell296f96f2007-10-22 11:03:37 +100023#include <linux/module.h>
24#include <linux/virtio.h>
25#include <linux/virtio_net.h>
26#include <linux/scatterlist.h>
Alex Williamsone918085a2009-01-25 18:06:26 -080027#include <linux/if_vlan.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Rusty Russell296f96f2007-10-22 11:03:37 +100029
Dor Laor6c0cd7c2007-12-16 15:19:43 +020030static int napi_weight = 128;
31module_param(napi_weight, int, 0444);
32
Rusty Russelleb939922011-12-19 14:08:01 +000033static bool csum = true, gso = true;
Rusty Russell34a48572008-02-04 23:50:02 -050034module_param(csum, bool, 0444);
35module_param(gso, bool, 0444);
36
Rusty Russell296f96f2007-10-22 11:03:37 +100037/* FIXME: MTU in config. */
Alex Williamsone918085a2009-01-25 18:06:26 -080038#define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -080039#define GOOD_COPY_LEN 128
Rusty Russell296f96f2007-10-22 11:03:37 +100040
Alex Williamsonf565a7c2009-02-04 09:02:45 +000041#define VIRTNET_SEND_COMMAND_SG_MAX 2
Rick Jones66846042011-11-14 14:17:08 +000042#define VIRTNET_DRIVER_VERSION "1.0.0"
Alex Williamson2a41f712009-02-04 09:02:34 +000043
stephen hemminger3fa2a1d2011-06-15 06:36:29 +000044struct virtnet_stats {
45 struct u64_stats_sync syncp;
46 u64 tx_bytes;
47 u64 tx_packets;
48
49 u64 rx_bytes;
50 u64 rx_packets;
51};
52
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -070053struct virtnet_info {
Rusty Russell296f96f2007-10-22 11:03:37 +100054 struct virtio_device *vdev;
Alex Williamson2a41f712009-02-04 09:02:34 +000055 struct virtqueue *rvq, *svq, *cvq;
Rusty Russell296f96f2007-10-22 11:03:37 +100056 struct net_device *dev;
57 struct napi_struct napi;
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -080058 unsigned int status;
Rusty Russell296f96f2007-10-22 11:03:37 +100059
60 /* Number of input buffers, and max we've ever had. */
61 unsigned int num, max;
62
Herbert Xu97402b92008-04-18 11:24:27 +080063 /* I like... big packets and I cannot lie! */
64 bool big_packets;
65
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -080066 /* Host will merge rx buffers for big packets (shake it! shake it!) */
67 bool mergeable_rx_bufs;
68
stephen hemminger3fa2a1d2011-06-15 06:36:29 +000069 /* Active statistics */
70 struct virtnet_stats __percpu *stats;
71
Rusty Russell3161e452009-08-26 12:22:32 -070072 /* Work struct for refilling if we run low on memory. */
73 struct delayed_work refill;
74
Rusty Russellfb6813f2008-07-25 12:06:01 -050075 /* Chain pages by the private ptr. */
76 struct page *pages;
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -070077
78 /* fragments + linear part + virtio header */
79 struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
80 struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
Rusty Russell296f96f2007-10-22 11:03:37 +100081};
82
Rusty Russellb3f24692009-09-24 09:59:19 -060083struct skb_vnet_hdr {
84 union {
85 struct virtio_net_hdr hdr;
86 struct virtio_net_hdr_mrg_rxbuf mhdr;
87 };
Rusty Russell48925e32009-09-24 09:59:20 -060088 unsigned int num_sg;
Rusty Russellb3f24692009-09-24 09:59:19 -060089};
90
Shirley Ma9ab86bb2010-01-29 03:20:04 +000091struct padded_vnet_hdr {
92 struct virtio_net_hdr hdr;
93 /*
94 * virtio_net_hdr should be in a separated sg buffer because of a
95 * QEMU bug, and data sg buffer shares same page with this header sg.
96 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
97 */
98 char padding[6];
99};
100
Rusty Russellb3f24692009-09-24 09:59:19 -0600101static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
Rusty Russell296f96f2007-10-22 11:03:37 +1000102{
Rusty Russellb3f24692009-09-24 09:59:19 -0600103 return (struct skb_vnet_hdr *)skb->cb;
Rusty Russell296f96f2007-10-22 11:03:37 +1000104}
105
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000106/*
107 * private is used to chain pages for big packets, put the whole
108 * most recent used list in the beginning for reuse
109 */
110static void give_pages(struct virtnet_info *vi, struct page *page)
Rusty Russellfb6813f2008-07-25 12:06:01 -0500111{
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000112 struct page *end;
113
114 /* Find end of list, sew whole thing into vi->pages. */
115 for (end = page; end->private; end = (struct page *)end->private);
116 end->private = (unsigned long)vi->pages;
Rusty Russellfb6813f2008-07-25 12:06:01 -0500117 vi->pages = page;
118}
119
120static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
121{
122 struct page *p = vi->pages;
123
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000124 if (p) {
Rusty Russellfb6813f2008-07-25 12:06:01 -0500125 vi->pages = (struct page *)p->private;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000126 /* clear private here, it is used to chain pages */
127 p->private = 0;
128 } else
Rusty Russellfb6813f2008-07-25 12:06:01 -0500129 p = alloc_page(gfp_mask);
130 return p;
131}
132
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500133static void skb_xmit_done(struct virtqueue *svq)
Rusty Russell296f96f2007-10-22 11:03:37 +1000134{
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500135 struct virtnet_info *vi = svq->vdev->priv;
Rusty Russell296f96f2007-10-22 11:03:37 +1000136
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500137 /* Suppress further interrupts. */
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300138 virtqueue_disable_cb(svq);
Rusty Russell11a3a152008-05-26 17:48:13 +1000139
Rusty Russell363f1512008-06-08 20:51:55 +1000140 /* We were probably waiting for more output buffers. */
Rusty Russell296f96f2007-10-22 11:03:37 +1000141 netif_wake_queue(vi->dev);
Rusty Russell296f96f2007-10-22 11:03:37 +1000142}
143
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000144static void set_skb_frag(struct sk_buff *skb, struct page *page,
145 unsigned int offset, unsigned int *len)
146{
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000147 int size = min((unsigned)PAGE_SIZE - offset, *len);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000148 int i = skb_shinfo(skb)->nr_frags;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000149
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000150 __skb_fill_page_desc(skb, i, page, offset, size);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000151
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000152 skb->data_len += size;
153 skb->len += size;
Eric Dumazet4b727362011-10-19 23:14:46 +0000154 skb->truesize += PAGE_SIZE;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000155 skb_shinfo(skb)->nr_frags++;
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000156 *len -= size;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000157}
158
Mike Waychison34646452012-01-04 12:52:32 +0000159/* Called from bottom half context */
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000160static struct sk_buff *page_to_skb(struct virtnet_info *vi,
161 struct page *page, unsigned int len)
162{
163 struct sk_buff *skb;
164 struct skb_vnet_hdr *hdr;
165 unsigned int copy, hdr_len, offset;
166 char *p;
167
168 p = page_address(page);
169
170 /* copy small packet so we can reuse these pages for small data */
171 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
172 if (unlikely(!skb))
173 return NULL;
174
175 hdr = skb_vnet_hdr(skb);
176
177 if (vi->mergeable_rx_bufs) {
178 hdr_len = sizeof hdr->mhdr;
179 offset = hdr_len;
180 } else {
181 hdr_len = sizeof hdr->hdr;
182 offset = sizeof(struct padded_vnet_hdr);
183 }
184
185 memcpy(hdr, p, hdr_len);
186
187 len -= hdr_len;
188 p += offset;
189
190 copy = len;
191 if (copy > skb_tailroom(skb))
192 copy = skb_tailroom(skb);
193 memcpy(skb_put(skb, copy), p, copy);
194
195 len -= copy;
196 offset += copy;
197
Sasha Levine878d782011-09-28 04:40:54 +0000198 /*
199 * Verify that we can indeed put this data into a skb.
200 * This is here to handle cases when the device erroneously
201 * tries to receive more than is possible. This is usually
202 * the case of a broken device.
203 */
204 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
205 if (net_ratelimit())
206 pr_debug("%s: too much data\n", skb->dev->name);
207 dev_kfree_skb(skb);
208 return NULL;
209 }
210
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000211 while (len) {
212 set_skb_frag(skb, page, offset, &len);
213 page = (struct page *)page->private;
214 offset = 0;
215 }
216
217 if (page)
218 give_pages(vi, page);
219
220 return skb;
221}
222
223static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
224{
225 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
226 struct page *page;
227 int num_buf, i, len;
228
229 num_buf = hdr->mhdr.num_buffers;
230 while (--num_buf) {
231 i = skb_shinfo(skb)->nr_frags;
232 if (i >= MAX_SKB_FRAGS) {
233 pr_debug("%s: packet too long\n", skb->dev->name);
234 skb->dev->stats.rx_length_errors++;
235 return -EINVAL;
236 }
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300237 page = virtqueue_get_buf(vi->rvq, &len);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000238 if (!page) {
239 pr_debug("%s: rx error: %d buffers missing\n",
240 skb->dev->name, hdr->mhdr.num_buffers);
241 skb->dev->stats.rx_length_errors++;
242 return -EINVAL;
243 }
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000244
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000245 if (len > PAGE_SIZE)
246 len = PAGE_SIZE;
247
248 set_skb_frag(skb, page, 0, &len);
249
250 --vi->num;
251 }
252 return 0;
253}
254
255static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
Rusty Russell296f96f2007-10-22 11:03:37 +1000256{
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800257 struct virtnet_info *vi = netdev_priv(dev);
Eric Dumazet58472a72012-02-13 06:53:41 +0000258 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000259 struct sk_buff *skb;
260 struct page *page;
261 struct skb_vnet_hdr *hdr;
Rusty Russell296f96f2007-10-22 11:03:37 +1000262
263 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
264 pr_debug("%s: short packet %i\n", dev->name, len);
265 dev->stats.rx_length_errors++;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000266 if (vi->mergeable_rx_bufs || vi->big_packets)
267 give_pages(vi, buf);
268 else
269 dev_kfree_skb(buf);
270 return;
Rusty Russell296f96f2007-10-22 11:03:37 +1000271 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000272
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000273 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
274 skb = buf;
275 len -= sizeof(struct virtio_net_hdr);
276 skb_trim(skb, len);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800277 } else {
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000278 page = buf;
279 skb = page_to_skb(vi, page, len);
280 if (unlikely(!skb)) {
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800281 dev->stats.rx_dropped++;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000282 give_pages(vi, page);
283 return;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800284 }
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000285 if (vi->mergeable_rx_bufs)
286 if (receive_mergeable(vi, skb)) {
287 dev_kfree_skb(skb);
288 return;
289 }
Herbert Xu97402b92008-04-18 11:24:27 +0800290 }
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800291
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000292 hdr = skb_vnet_hdr(skb);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000293
294 u64_stats_update_begin(&stats->syncp);
295 stats->rx_bytes += skb->len;
296 stats->rx_packets++;
297 u64_stats_update_end(&stats->syncp);
Rusty Russell296f96f2007-10-22 11:03:37 +1000298
Rusty Russellb3f24692009-09-24 09:59:19 -0600299 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000300 pr_debug("Needs csum!\n");
Rusty Russellb3f24692009-09-24 09:59:19 -0600301 if (!skb_partial_csum_set(skb,
302 hdr->hdr.csum_start,
303 hdr->hdr.csum_offset))
Rusty Russell296f96f2007-10-22 11:03:37 +1000304 goto frame_err;
Jason Wang10a8d942011-06-10 00:56:17 +0000305 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
306 skb->ip_summed = CHECKSUM_UNNECESSARY;
Rusty Russell296f96f2007-10-22 11:03:37 +1000307 }
308
Mark McLoughlin23cde762008-06-08 20:49:00 +1000309 skb->protocol = eth_type_trans(skb, dev);
310 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
311 ntohs(skb->protocol), skb->len, skb->pkt_type);
312
Rusty Russellb3f24692009-09-24 09:59:19 -0600313 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000314 pr_debug("GSO!\n");
Rusty Russellb3f24692009-09-24 09:59:19 -0600315 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000316 case VIRTIO_NET_HDR_GSO_TCPV4:
317 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
318 break;
Rusty Russell296f96f2007-10-22 11:03:37 +1000319 case VIRTIO_NET_HDR_GSO_UDP:
320 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
321 break;
322 case VIRTIO_NET_HDR_GSO_TCPV6:
323 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
324 break;
325 default:
326 if (net_ratelimit())
327 printk(KERN_WARNING "%s: bad gso type %u.\n",
Rusty Russellb3f24692009-09-24 09:59:19 -0600328 dev->name, hdr->hdr.gso_type);
Rusty Russell296f96f2007-10-22 11:03:37 +1000329 goto frame_err;
330 }
331
Rusty Russellb3f24692009-09-24 09:59:19 -0600332 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
Rusty Russell34a48572008-02-04 23:50:02 -0500333 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
334
Rusty Russellb3f24692009-09-24 09:59:19 -0600335 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
Rusty Russell296f96f2007-10-22 11:03:37 +1000336 if (skb_shinfo(skb)->gso_size == 0) {
337 if (net_ratelimit())
338 printk(KERN_WARNING "%s: zero gso size.\n",
339 dev->name);
340 goto frame_err;
341 }
342
343 /* Header must be checked, and gso_segs computed. */
344 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
345 skb_shinfo(skb)->gso_segs = 0;
346 }
347
348 netif_receive_skb(skb);
349 return;
350
351frame_err:
352 dev->stats.rx_frame_errors++;
Rusty Russell296f96f2007-10-22 11:03:37 +1000353 dev_kfree_skb(skb);
354}
355
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000356static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
Rusty Russell296f96f2007-10-22 11:03:37 +1000357{
358 struct sk_buff *skb;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000359 struct skb_vnet_hdr *hdr;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000360 int err;
Rusty Russell296f96f2007-10-22 11:03:37 +1000361
Mike Waychison34646452012-01-04 12:52:32 +0000362 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000363 if (unlikely(!skb))
364 return -ENOMEM;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800365
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000366 skb_put(skb, MAX_PACKET_LEN);
367
368 hdr = skb_vnet_hdr(skb);
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700369 sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000370
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700371 skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000372
Rusty Russellf96fde42012-01-12 15:44:42 +1030373 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000374 if (err < 0)
375 dev_kfree_skb(skb);
376
377 return err;
378}
379
380static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
381{
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000382 struct page *first, *list = NULL;
383 char *p;
384 int i, err, offset;
385
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700386 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000387 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
388 first = get_a_page(vi, gfp);
389 if (!first) {
390 if (list)
391 give_pages(vi, list);
392 return -ENOMEM;
Rusty Russell3161e452009-08-26 12:22:32 -0700393 }
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700394 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
Rusty Russell296f96f2007-10-22 11:03:37 +1000395
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000396 /* chain new page in list head to match sg */
397 first->private = (unsigned long)list;
398 list = first;
399 }
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800400
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000401 first = get_a_page(vi, gfp);
402 if (!first) {
403 give_pages(vi, list);
404 return -ENOMEM;
405 }
406 p = page_address(first);
Herbert Xu97402b92008-04-18 11:24:27 +0800407
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700408 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
409 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
410 sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
Herbert Xu97402b92008-04-18 11:24:27 +0800411
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700412 /* vi->rx_sg[1] for data packet, from offset */
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000413 offset = sizeof(struct padded_vnet_hdr);
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700414 sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
Herbert Xu97402b92008-04-18 11:24:27 +0800415
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000416 /* chain first in list head */
417 first->private = (unsigned long)list;
Rusty Russellf96fde42012-01-12 15:44:42 +1030418 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
419 first, gfp);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000420 if (err < 0)
421 give_pages(vi, first);
Herbert Xu97402b92008-04-18 11:24:27 +0800422
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000423 return err;
424}
Herbert Xu97402b92008-04-18 11:24:27 +0800425
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000426static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
427{
428 struct page *page;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000429 int err;
Rusty Russell296f96f2007-10-22 11:03:37 +1000430
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000431 page = get_a_page(vi, gfp);
432 if (!page)
433 return -ENOMEM;
434
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700435 sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000436
Rusty Russellf96fde42012-01-12 15:44:42 +1030437 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000438 if (err < 0)
439 give_pages(vi, page);
440
441 return err;
Rusty Russell296f96f2007-10-22 11:03:37 +1000442}
443
Rusty Russellb2baed62011-12-29 00:42:38 +0000444/*
445 * Returns false if we couldn't fill entirely (OOM).
446 *
447 * Normally run in the receive path, but can also be run from ndo_open
448 * before we're receiving packets, or from refill_work which is
449 * careful to disable receiving (using napi_disable).
450 */
Rusty Russell3161e452009-08-26 12:22:32 -0700451static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800452{
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800453 int err;
Michael S. Tsirkin1788f492010-07-02 16:32:55 +0000454 bool oom;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800455
Amit Shah0aea51c2009-08-26 14:58:28 +0530456 do {
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000457 if (vi->mergeable_rx_bufs)
458 err = add_recvbuf_mergeable(vi, gfp);
459 else if (vi->big_packets)
460 err = add_recvbuf_big(vi, gfp);
461 else
462 err = add_recvbuf_small(vi, gfp);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800463
Michael S. Tsirkin1788f492010-07-02 16:32:55 +0000464 oom = err == -ENOMEM;
465 if (err < 0)
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800466 break;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000467 ++vi->num;
Amit Shah0aea51c2009-08-26 14:58:28 +0530468 } while (err > 0);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800469 if (unlikely(vi->num > vi->max))
470 vi->max = vi->num;
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300471 virtqueue_kick(vi->rvq);
Rusty Russell3161e452009-08-26 12:22:32 -0700472 return !oom;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800473}
474
Rusty Russell18445c42008-02-04 23:49:57 -0500475static void skb_recv_done(struct virtqueue *rvq)
Rusty Russell296f96f2007-10-22 11:03:37 +1000476{
477 struct virtnet_info *vi = rvq->vdev->priv;
Rusty Russell18445c42008-02-04 23:49:57 -0500478 /* Schedule NAPI, Suppress further interrupts if successful. */
Ben Hutchings288379f2009-01-19 16:43:59 -0800479 if (napi_schedule_prep(&vi->napi)) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300480 virtqueue_disable_cb(rvq);
Ben Hutchings288379f2009-01-19 16:43:59 -0800481 __napi_schedule(&vi->napi);
Rusty Russell18445c42008-02-04 23:49:57 -0500482 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000483}
484
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800485static void virtnet_napi_enable(struct virtnet_info *vi)
486{
487 napi_enable(&vi->napi);
488
489 /* If all buffers were filled by other side before we napi_enabled, we
490 * won't get another interrupt, so process any outstanding packets
491 * now. virtnet_poll wants re-enable the queue, so we disable here.
492 * We synchronize against interrupts via NAPI_STATE_SCHED */
493 if (napi_schedule_prep(&vi->napi)) {
494 virtqueue_disable_cb(vi->rvq);
Michael S. Tsirkinec13ee82012-05-16 10:57:12 +0300495 local_bh_disable();
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800496 __napi_schedule(&vi->napi);
Michael S. Tsirkinec13ee82012-05-16 10:57:12 +0300497 local_bh_enable();
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800498 }
499}
500
Rusty Russell3161e452009-08-26 12:22:32 -0700501static void refill_work(struct work_struct *work)
502{
503 struct virtnet_info *vi;
504 bool still_empty;
505
506 vi = container_of(work, struct virtnet_info, refill.work);
507 napi_disable(&vi->napi);
Herbert Xu39d32152010-01-25 15:51:01 -0800508 still_empty = !try_fill_recv(vi, GFP_KERNEL);
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800509 virtnet_napi_enable(vi);
Rusty Russell3161e452009-08-26 12:22:32 -0700510
511 /* In theory, this can happen: if we don't get any buffers in
512 * we will *never* try to fill again. */
513 if (still_empty)
Rusty Russellf1776da2011-12-29 00:43:15 +0000514 queue_delayed_work(system_nrt_wq, &vi->refill, HZ/2);
Rusty Russell3161e452009-08-26 12:22:32 -0700515}
516
Rusty Russell296f96f2007-10-22 11:03:37 +1000517static int virtnet_poll(struct napi_struct *napi, int budget)
518{
519 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000520 void *buf;
Rusty Russell296f96f2007-10-22 11:03:37 +1000521 unsigned int len, received = 0;
522
523again:
524 while (received < budget &&
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300525 (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000526 receive_buf(vi->dev, buf, len);
527 --vi->num;
Rusty Russell296f96f2007-10-22 11:03:37 +1000528 received++;
529 }
530
Rusty Russell3161e452009-08-26 12:22:32 -0700531 if (vi->num < vi->max / 2) {
532 if (!try_fill_recv(vi, GFP_ATOMIC))
Rusty Russellf1776da2011-12-29 00:43:15 +0000533 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
Rusty Russell3161e452009-08-26 12:22:32 -0700534 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000535
Rusty Russell8329d982007-11-19 11:20:43 -0500536 /* Out of packets? */
537 if (received < budget) {
Ben Hutchings288379f2009-01-19 16:43:59 -0800538 napi_complete(napi);
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300539 if (unlikely(!virtqueue_enable_cb(vi->rvq)) &&
Joe Perches8e95a202009-12-03 07:58:21 +0000540 napi_schedule_prep(napi)) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300541 virtqueue_disable_cb(vi->rvq);
Ben Hutchings288379f2009-01-19 16:43:59 -0800542 __napi_schedule(napi);
Rusty Russell296f96f2007-10-22 11:03:37 +1000543 goto again;
Christian Borntraeger4265f162008-03-14 14:17:05 +0100544 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000545 }
546
547 return received;
548}
549
Rusty Russell48925e32009-09-24 09:59:20 -0600550static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
Rusty Russell296f96f2007-10-22 11:03:37 +1000551{
552 struct sk_buff *skb;
Rusty Russell48925e32009-09-24 09:59:20 -0600553 unsigned int len, tot_sgs = 0;
Eric Dumazet58472a72012-02-13 06:53:41 +0000554 struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
Rusty Russell296f96f2007-10-22 11:03:37 +1000555
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300556 while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000557 pr_debug("Sent skb %p\n", skb);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000558
559 u64_stats_update_begin(&stats->syncp);
560 stats->tx_bytes += skb->len;
561 stats->tx_packets++;
562 u64_stats_update_end(&stats->syncp);
563
Rusty Russell48925e32009-09-24 09:59:20 -0600564 tot_sgs += skb_vnet_hdr(skb)->num_sg;
Eric Dumazeted79bab2009-10-14 14:36:43 +0000565 dev_kfree_skb_any(skb);
Rusty Russell296f96f2007-10-22 11:03:37 +1000566 }
Rusty Russell48925e32009-09-24 09:59:20 -0600567 return tot_sgs;
Rusty Russell296f96f2007-10-22 11:03:37 +1000568}
569
Rusty Russell99ffc692008-05-02 21:50:46 -0500570static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
Rusty Russell296f96f2007-10-22 11:03:37 +1000571{
Rusty Russellb3f24692009-09-24 09:59:19 -0600572 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
Rusty Russell296f96f2007-10-22 11:03:37 +1000573 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
Rusty Russell296f96f2007-10-22 11:03:37 +1000574
Johannes Berge1749612008-10-27 15:59:26 -0700575 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
Rusty Russell296f96f2007-10-22 11:03:37 +1000576
Rusty Russell296f96f2007-10-22 11:03:37 +1000577 if (skb->ip_summed == CHECKSUM_PARTIAL) {
Rusty Russellb3f24692009-09-24 09:59:19 -0600578 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
Michał Mirosław55508d62010-12-14 15:24:08 +0000579 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
Rusty Russellb3f24692009-09-24 09:59:19 -0600580 hdr->hdr.csum_offset = skb->csum_offset;
Rusty Russell296f96f2007-10-22 11:03:37 +1000581 } else {
Rusty Russellb3f24692009-09-24 09:59:19 -0600582 hdr->hdr.flags = 0;
583 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
Rusty Russell296f96f2007-10-22 11:03:37 +1000584 }
585
586 if (skb_is_gso(skb)) {
Rusty Russellb3f24692009-09-24 09:59:19 -0600587 hdr->hdr.hdr_len = skb_headlen(skb);
588 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
Rusty Russell34a48572008-02-04 23:50:02 -0500589 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
Rusty Russellb3f24692009-09-24 09:59:19 -0600590 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
Rusty Russell296f96f2007-10-22 11:03:37 +1000591 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
Rusty Russellb3f24692009-09-24 09:59:19 -0600592 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
Rusty Russell296f96f2007-10-22 11:03:37 +1000593 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
Rusty Russellb3f24692009-09-24 09:59:19 -0600594 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
Rusty Russell296f96f2007-10-22 11:03:37 +1000595 else
596 BUG();
Rusty Russell34a48572008-02-04 23:50:02 -0500597 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
Rusty Russellb3f24692009-09-24 09:59:19 -0600598 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
Rusty Russell296f96f2007-10-22 11:03:37 +1000599 } else {
Rusty Russellb3f24692009-09-24 09:59:19 -0600600 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
601 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
Rusty Russell296f96f2007-10-22 11:03:37 +1000602 }
603
Rusty Russellb3f24692009-09-24 09:59:19 -0600604 hdr->mhdr.num_buffers = 0;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800605
606 /* Encode metadata header at front. */
607 if (vi->mergeable_rx_bufs)
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700608 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800609 else
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700610 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800611
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700612 hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
Linus Torvalds1756ac32010-05-21 17:22:52 -0700613 return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
Rusty Russellf96fde42012-01-12 15:44:42 +1030614 0, skb, GFP_ATOMIC);
Rusty Russell11a3a152008-05-26 17:48:13 +1000615}
616
Stephen Hemminger424efe92009-08-31 19:50:51 +0000617static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
Rusty Russell99ffc692008-05-02 21:50:46 -0500618{
619 struct virtnet_info *vi = netdev_priv(dev);
Rusty Russell48925e32009-09-24 09:59:20 -0600620 int capacity;
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500621
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500622 /* Free up any pending old buffers before queueing new ones. */
623 free_old_xmit_skbs(vi);
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500624
Michael S. Tsirkin03f191b2009-10-28 04:03:38 -0700625 /* Try to transmit */
Rusty Russell48925e32009-09-24 09:59:20 -0600626 capacity = xmit_skb(vi, skb);
627
628 /* This can happen with OOM and indirect buffers. */
629 if (unlikely(capacity < 0)) {
Rick Jones2e57b792012-03-27 07:28:09 +0000630 if (likely(capacity == -ENOMEM)) {
Torsten Kaiser31304162012-04-09 05:14:15 +0000631 if (net_ratelimit())
Rusty Russell58eba972010-07-02 16:34:01 +0000632 dev_warn(&dev->dev,
633 "TX queue failure: out of memory\n");
Torsten Kaiser31304162012-04-09 05:14:15 +0000634 } else {
Rick Jones2e57b792012-03-27 07:28:09 +0000635 dev->stats.tx_fifo_errors++;
636 if (net_ratelimit())
Rusty Russell58eba972010-07-02 16:34:01 +0000637 dev_warn(&dev->dev,
638 "Unexpected TX queue failure: %d\n",
639 capacity);
Rusty Russell48925e32009-09-24 09:59:20 -0600640 }
Rusty Russell58eba972010-07-02 16:34:01 +0000641 dev->stats.tx_dropped++;
642 kfree_skb(skb);
643 return NETDEV_TX_OK;
Rusty Russell99ffc692008-05-02 21:50:46 -0500644 }
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300645 virtqueue_kick(vi->svq);
Michael S. Tsirkin03f191b2009-10-28 04:03:38 -0700646
Rusty Russell48925e32009-09-24 09:59:20 -0600647 /* Don't wait up for transmitted skbs to be freed. */
648 skb_orphan(skb);
649 nf_reset(skb);
Rusty Russell99ffc692008-05-02 21:50:46 -0500650
Rusty Russell48925e32009-09-24 09:59:20 -0600651 /* Apparently nice girls don't return TX_BUSY; stop the queue
652 * before it gets out of hand. Naturally, this wastes entries. */
653 if (capacity < 2+MAX_SKB_FRAGS) {
654 netif_stop_queue(dev);
Michael S. Tsirkin7a66f782011-05-20 02:11:23 +0300655 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
Rusty Russell48925e32009-09-24 09:59:20 -0600656 /* More just got used, free them then recheck. */
657 capacity += free_old_xmit_skbs(vi);
658 if (capacity >= 2+MAX_SKB_FRAGS) {
659 netif_start_queue(dev);
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300660 virtqueue_disable_cb(vi->svq);
Rusty Russell48925e32009-09-24 09:59:20 -0600661 }
662 }
Rusty Russell99ffc692008-05-02 21:50:46 -0500663 }
Rusty Russell48925e32009-09-24 09:59:20 -0600664
665 return NETDEV_TX_OK;
Rusty Russell296f96f2007-10-22 11:03:37 +1000666}
667
Alex Williamson9c46f6d2009-02-04 16:36:34 -0800668static int virtnet_set_mac_address(struct net_device *dev, void *p)
669{
670 struct virtnet_info *vi = netdev_priv(dev);
671 struct virtio_device *vdev = vi->vdev;
672 int ret;
673
674 ret = eth_mac_addr(dev, p);
675 if (ret)
676 return ret;
677
Alex Williamson62994b22009-04-04 16:40:19 -0700678 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
679 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
680 dev->dev_addr, dev->addr_len);
Alex Williamson9c46f6d2009-02-04 16:36:34 -0800681
682 return 0;
683}
684
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000685static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
686 struct rtnl_link_stats64 *tot)
687{
688 struct virtnet_info *vi = netdev_priv(dev);
689 int cpu;
690 unsigned int start;
691
692 for_each_possible_cpu(cpu) {
Eric Dumazet58472a72012-02-13 06:53:41 +0000693 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000694 u64 tpackets, tbytes, rpackets, rbytes;
695
696 do {
697 start = u64_stats_fetch_begin(&stats->syncp);
698 tpackets = stats->tx_packets;
699 tbytes = stats->tx_bytes;
700 rpackets = stats->rx_packets;
701 rbytes = stats->rx_bytes;
702 } while (u64_stats_fetch_retry(&stats->syncp, start));
703
704 tot->rx_packets += rpackets;
705 tot->tx_packets += tpackets;
706 tot->rx_bytes += rbytes;
707 tot->tx_bytes += tbytes;
708 }
709
710 tot->tx_dropped = dev->stats.tx_dropped;
Rick Jones021ac8d2011-11-21 09:28:17 +0000711 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000712 tot->rx_dropped = dev->stats.rx_dropped;
713 tot->rx_length_errors = dev->stats.rx_length_errors;
714 tot->rx_frame_errors = dev->stats.rx_frame_errors;
715
716 return tot;
717}
718
Amit Shahda74e892008-02-29 16:24:50 +0530719#ifdef CONFIG_NET_POLL_CONTROLLER
720static void virtnet_netpoll(struct net_device *dev)
721{
722 struct virtnet_info *vi = netdev_priv(dev);
723
724 napi_schedule(&vi->napi);
725}
726#endif
727
Rusty Russell296f96f2007-10-22 11:03:37 +1000728static int virtnet_open(struct net_device *dev)
729{
730 struct virtnet_info *vi = netdev_priv(dev);
731
Rusty Russellb2baed62011-12-29 00:42:38 +0000732 /* Make sure we have some buffers: if oom use wq. */
733 if (!try_fill_recv(vi, GFP_KERNEL))
Rusty Russellf1776da2011-12-29 00:43:15 +0000734 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
Rusty Russellb2baed62011-12-29 00:42:38 +0000735
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800736 virtnet_napi_enable(vi);
Rusty Russell296f96f2007-10-22 11:03:37 +1000737 return 0;
738}
739
Alex Williamson2a41f712009-02-04 09:02:34 +0000740/*
741 * Send command via the control virtqueue and check status. Commands
742 * supported by the hypervisor, as indicated by feature bits, should
743 * never fail unless improperly formated.
744 */
745static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
746 struct scatterlist *data, int out, int in)
747{
Alex Williamson23e258e2009-05-01 17:27:56 +0000748 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
Alex Williamson2a41f712009-02-04 09:02:34 +0000749 struct virtio_net_ctrl_hdr ctrl;
750 virtio_net_ctrl_ack status = ~0;
751 unsigned int tmp;
Alex Williamson23e258e2009-05-01 17:27:56 +0000752 int i;
Alex Williamson2a41f712009-02-04 09:02:34 +0000753
Alexander Beregalov0ee904c2009-04-11 14:50:23 +0000754 /* Caller should know better */
755 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
756 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
Alex Williamson2a41f712009-02-04 09:02:34 +0000757
758 out++; /* Add header */
759 in++; /* Add return status */
760
761 ctrl.class = class;
762 ctrl.cmd = cmd;
763
764 sg_init_table(sg, out + in);
765
766 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
Alex Williamson23e258e2009-05-01 17:27:56 +0000767 for_each_sg(data, s, out + in - 2, i)
768 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
Alex Williamson2a41f712009-02-04 09:02:34 +0000769 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
770
Rusty Russellf96fde42012-01-12 15:44:42 +1030771 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
Alex Williamson2a41f712009-02-04 09:02:34 +0000772
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300773 virtqueue_kick(vi->cvq);
Alex Williamson2a41f712009-02-04 09:02:34 +0000774
775 /*
776 * Spin for a response, the kick causes an ioport write, trapping
777 * into the hypervisor, so the request should be handled immediately.
778 */
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300779 while (!virtqueue_get_buf(vi->cvq, &tmp))
Alex Williamson2a41f712009-02-04 09:02:34 +0000780 cpu_relax();
781
782 return status == VIRTIO_NET_OK;
783}
784
Rusty Russell296f96f2007-10-22 11:03:37 +1000785static int virtnet_close(struct net_device *dev)
786{
787 struct virtnet_info *vi = netdev_priv(dev);
Rusty Russell296f96f2007-10-22 11:03:37 +1000788
Rusty Russellb2baed62011-12-29 00:42:38 +0000789 /* Make sure refill_work doesn't re-enable napi! */
790 cancel_delayed_work_sync(&vi->refill);
Rusty Russell296f96f2007-10-22 11:03:37 +1000791 napi_disable(&vi->napi);
792
Rusty Russell296f96f2007-10-22 11:03:37 +1000793 return 0;
794}
795
Alex Williamson2af76982009-02-04 09:02:40 +0000796static void virtnet_set_rx_mode(struct net_device *dev)
797{
798 struct virtnet_info *vi = netdev_priv(dev);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000799 struct scatterlist sg[2];
Alex Williamson2af76982009-02-04 09:02:40 +0000800 u8 promisc, allmulti;
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000801 struct virtio_net_ctrl_mac *mac_data;
Jiri Pirkoccffad22009-05-22 23:22:17 +0000802 struct netdev_hw_addr *ha;
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800803 int uc_count;
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000804 int mc_count;
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000805 void *buf;
806 int i;
Alex Williamson2af76982009-02-04 09:02:40 +0000807
808 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
809 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
810 return;
811
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000812 promisc = ((dev->flags & IFF_PROMISC) != 0);
813 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
Alex Williamson2af76982009-02-04 09:02:40 +0000814
Alex Williamson23e258e2009-05-01 17:27:56 +0000815 sg_init_one(sg, &promisc, sizeof(promisc));
Alex Williamson2af76982009-02-04 09:02:40 +0000816
817 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
818 VIRTIO_NET_CTRL_RX_PROMISC,
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000819 sg, 1, 0))
Alex Williamson2af76982009-02-04 09:02:40 +0000820 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
821 promisc ? "en" : "dis");
822
Alex Williamson23e258e2009-05-01 17:27:56 +0000823 sg_init_one(sg, &allmulti, sizeof(allmulti));
Alex Williamson2af76982009-02-04 09:02:40 +0000824
825 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
826 VIRTIO_NET_CTRL_RX_ALLMULTI,
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000827 sg, 1, 0))
Alex Williamson2af76982009-02-04 09:02:40 +0000828 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
829 allmulti ? "en" : "dis");
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000830
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800831 uc_count = netdev_uc_count(dev);
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000832 mc_count = netdev_mc_count(dev);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000833 /* MAC filter - use one buffer for both lists */
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000834 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
835 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
836 mac_data = buf;
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000837 if (!buf) {
838 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
839 return;
840 }
841
Alex Williamson23e258e2009-05-01 17:27:56 +0000842 sg_init_table(sg, 2);
843
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000844 /* Store the unicast list and count in the front of the buffer */
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800845 mac_data->entries = uc_count;
Jiri Pirkoccffad22009-05-22 23:22:17 +0000846 i = 0;
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800847 netdev_for_each_uc_addr(ha, dev)
Jiri Pirkoccffad22009-05-22 23:22:17 +0000848 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000849
850 sg_set_buf(&sg[0], mac_data,
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800851 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000852
853 /* multicast list and count fill the end */
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800854 mac_data = (void *)&mac_data->macs[uc_count][0];
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000855
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000856 mac_data->entries = mc_count;
Jiri Pirko567ec872010-02-23 23:17:07 +0000857 i = 0;
Jiri Pirko22bedad2010-04-01 21:22:57 +0000858 netdev_for_each_mc_addr(ha, dev)
859 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000860
861 sg_set_buf(&sg[1], mac_data,
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000862 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000863
864 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
865 VIRTIO_NET_CTRL_MAC_TABLE_SET,
866 sg, 2, 0))
867 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
868
869 kfree(buf);
Alex Williamson2af76982009-02-04 09:02:40 +0000870}
871
Jiri Pirko8e586132011-12-08 19:52:37 -0500872static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
Alex Williamson0bde95692009-02-04 09:02:50 +0000873{
874 struct virtnet_info *vi = netdev_priv(dev);
875 struct scatterlist sg;
876
Alex Williamson23e258e2009-05-01 17:27:56 +0000877 sg_init_one(&sg, &vid, sizeof(vid));
Alex Williamson0bde95692009-02-04 09:02:50 +0000878
879 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
880 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
881 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
Jiri Pirko8e586132011-12-08 19:52:37 -0500882 return 0;
Alex Williamson0bde95692009-02-04 09:02:50 +0000883}
884
Jiri Pirko8e586132011-12-08 19:52:37 -0500885static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
Alex Williamson0bde95692009-02-04 09:02:50 +0000886{
887 struct virtnet_info *vi = netdev_priv(dev);
888 struct scatterlist sg;
889
Alex Williamson23e258e2009-05-01 17:27:56 +0000890 sg_init_one(&sg, &vid, sizeof(vid));
Alex Williamson0bde95692009-02-04 09:02:50 +0000891
892 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
893 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
894 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
Jiri Pirko8e586132011-12-08 19:52:37 -0500895 return 0;
Alex Williamson0bde95692009-02-04 09:02:50 +0000896}
897
Rick Jones8f9f4662011-10-19 08:10:59 +0000898static void virtnet_get_ringparam(struct net_device *dev,
899 struct ethtool_ringparam *ring)
900{
901 struct virtnet_info *vi = netdev_priv(dev);
902
Yatin Manerkarc89a2d02012-06-12 15:27:41 -0700903 ring->rx_max_pending = virtqueue_get_impl_size(vi->rvq);
904 ring->tx_max_pending = virtqueue_get_impl_size(vi->svq);
Rick Jones8f9f4662011-10-19 08:10:59 +0000905 ring->rx_pending = ring->rx_max_pending;
906 ring->tx_pending = ring->tx_max_pending;
907
908}
909
Rick Jones66846042011-11-14 14:17:08 +0000910
911static void virtnet_get_drvinfo(struct net_device *dev,
912 struct ethtool_drvinfo *info)
913{
914 struct virtnet_info *vi = netdev_priv(dev);
915 struct virtio_device *vdev = vi->vdev;
916
917 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
918 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
919 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
920
921}
922
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700923static const struct ethtool_ops virtnet_ethtool_ops = {
Rick Jones66846042011-11-14 14:17:08 +0000924 .get_drvinfo = virtnet_get_drvinfo,
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800925 .get_link = ethtool_op_get_link,
Rick Jones8f9f4662011-10-19 08:10:59 +0000926 .get_ringparam = virtnet_get_ringparam,
Herbert Xua9ea3fc2008-04-18 11:21:42 +0800927};
928
Mark McLoughlin39da5812008-11-26 13:58:11 +0000929#define MIN_MTU 68
930#define MAX_MTU 65535
931
932static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
933{
934 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
935 return -EINVAL;
936 dev->mtu = new_mtu;
937 return 0;
938}
939
Stephen Hemminger76288b42009-01-06 10:44:22 -0800940static const struct net_device_ops virtnet_netdev = {
941 .ndo_open = virtnet_open,
942 .ndo_stop = virtnet_close,
943 .ndo_start_xmit = start_xmit,
944 .ndo_validate_addr = eth_validate_addr,
Alex Williamson9c46f6d2009-02-04 16:36:34 -0800945 .ndo_set_mac_address = virtnet_set_mac_address,
Alex Williamson2af76982009-02-04 09:02:40 +0000946 .ndo_set_rx_mode = virtnet_set_rx_mode,
Stephen Hemminger76288b42009-01-06 10:44:22 -0800947 .ndo_change_mtu = virtnet_change_mtu,
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000948 .ndo_get_stats64 = virtnet_stats,
Alex Williamson1824a982009-05-01 17:31:10 +0000949 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
950 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
Stephen Hemminger76288b42009-01-06 10:44:22 -0800951#ifdef CONFIG_NET_POLL_CONTROLLER
952 .ndo_poll_controller = virtnet_netpoll,
953#endif
954};
955
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800956static void virtnet_update_status(struct virtnet_info *vi)
957{
958 u16 v;
959
Sasha Levin77dd7692011-08-14 17:52:33 +0300960 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800961 offsetof(struct virtio_net_config, status),
Sasha Levin77dd7692011-08-14 17:52:33 +0300962 &v) < 0)
963 return;
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800964
965 /* Ignore unknown (future) status bits */
966 v &= VIRTIO_NET_S_LINK_UP;
967
968 if (vi->status == v)
969 return;
970
971 vi->status = v;
972
973 if (vi->status & VIRTIO_NET_S_LINK_UP) {
974 netif_carrier_on(vi->dev);
975 netif_wake_queue(vi->dev);
976 } else {
977 netif_carrier_off(vi->dev);
978 netif_stop_queue(vi->dev);
979 }
980}
981
982static void virtnet_config_changed(struct virtio_device *vdev)
983{
984 struct virtnet_info *vi = vdev->priv;
985
986 virtnet_update_status(vi);
987}
988
Amit Shah3f9c10b2011-12-22 16:58:31 +0530989static int init_vqs(struct virtnet_info *vi)
990{
991 struct virtqueue *vqs[3];
992 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
993 const char *names[] = { "input", "output", "control" };
994 int nvqs, err;
995
996 /* We expect two virtqueues, receive then send,
997 * and optionally control. */
998 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
999
1000 err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
1001 if (err)
1002 return err;
1003
1004 vi->rvq = vqs[0];
1005 vi->svq = vqs[1];
1006
1007 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
1008 vi->cvq = vqs[2];
1009
1010 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1011 vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1012 }
1013 return 0;
1014}
1015
Rusty Russell296f96f2007-10-22 11:03:37 +10001016static int virtnet_probe(struct virtio_device *vdev)
1017{
1018 int err;
Rusty Russell296f96f2007-10-22 11:03:37 +10001019 struct net_device *dev;
1020 struct virtnet_info *vi;
Rusty Russell296f96f2007-10-22 11:03:37 +10001021
1022 /* Allocate ourselves a network device with room for our info */
1023 dev = alloc_etherdev(sizeof(struct virtnet_info));
1024 if (!dev)
1025 return -ENOMEM;
1026
1027 /* Set up network device as normal. */
Jiri Pirko01789342011-08-16 06:29:00 +00001028 dev->priv_flags |= IFF_UNICAST_FLT;
Stephen Hemminger76288b42009-01-06 10:44:22 -08001029 dev->netdev_ops = &virtnet_netdev;
Rusty Russell296f96f2007-10-22 11:03:37 +10001030 dev->features = NETIF_F_HIGHDMA;
stephen hemminger3fa2a1d2011-06-15 06:36:29 +00001031
Herbert Xua9ea3fc2008-04-18 11:21:42 +08001032 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
Rusty Russell296f96f2007-10-22 11:03:37 +10001033 SET_NETDEV_DEV(dev, &vdev->dev);
1034
1035 /* Do we support "hardware" checksums? */
Michał Mirosław98e778c2011-03-31 01:01:35 +00001036 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
Rusty Russell296f96f2007-10-22 11:03:37 +10001037 /* This opens up the world of extra features. */
Michał Mirosław98e778c2011-03-31 01:01:35 +00001038 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1039 if (csum)
1040 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1041
1042 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1043 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
Rusty Russell34a48572008-02-04 23:50:02 -05001044 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1045 }
Rusty Russell5539ae92008-05-02 21:50:46 -05001046 /* Individual feature bits: what can host handle? */
Michał Mirosław98e778c2011-03-31 01:01:35 +00001047 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1048 dev->hw_features |= NETIF_F_TSO;
1049 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1050 dev->hw_features |= NETIF_F_TSO6;
1051 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1052 dev->hw_features |= NETIF_F_TSO_ECN;
1053 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1054 dev->hw_features |= NETIF_F_UFO;
1055
1056 if (gso)
1057 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1058 /* (!csum && gso) case will be fixed by register_netdev() */
Rusty Russell296f96f2007-10-22 11:03:37 +10001059 }
1060
1061 /* Configuration may specify what MAC to use. Otherwise random. */
Sasha Levin77dd7692011-08-14 17:52:33 +03001062 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
Rusty Russella586d4f2008-02-04 23:49:56 -05001063 offsetof(struct virtio_net_config, mac),
Sasha Levin77dd7692011-08-14 17:52:33 +03001064 dev->dev_addr, dev->addr_len) < 0)
Danny Kukawkaf2cedb62012-02-15 06:45:39 +00001065 eth_hw_addr_random(dev);
Rusty Russell296f96f2007-10-22 11:03:37 +10001066
1067 /* Set up our device-specific information */
1068 vi = netdev_priv(dev);
Dor Laor6c0cd7c2007-12-16 15:19:43 +02001069 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
Rusty Russell296f96f2007-10-22 11:03:37 +10001070 vi->dev = dev;
1071 vi->vdev = vdev;
Christian Borntraegerd9d5dcc2008-02-18 10:02:51 +01001072 vdev->priv = vi;
Rusty Russellfb6813f2008-07-25 12:06:01 -05001073 vi->pages = NULL;
stephen hemminger3fa2a1d2011-06-15 06:36:29 +00001074 vi->stats = alloc_percpu(struct virtnet_stats);
1075 err = -ENOMEM;
1076 if (vi->stats == NULL)
1077 goto free;
1078
Rusty Russell3161e452009-08-26 12:22:32 -07001079 INIT_DELAYED_WORK(&vi->refill, refill_work);
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -07001080 sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
1081 sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
Rusty Russell296f96f2007-10-22 11:03:37 +10001082
Herbert Xu97402b92008-04-18 11:24:27 +08001083 /* If we can receive ANY GSO packets, we must allocate large ones. */
Joe Perches8e95a202009-12-03 07:58:21 +00001084 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1085 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1086 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
Herbert Xu97402b92008-04-18 11:24:27 +08001087 vi->big_packets = true;
1088
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -08001089 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1090 vi->mergeable_rx_bufs = true;
1091
Amit Shah3f9c10b2011-12-22 16:58:31 +05301092 err = init_vqs(vi);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001093 if (err)
stephen hemminger3fa2a1d2011-06-15 06:36:29 +00001094 goto free_stats;
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001095
Rusty Russell296f96f2007-10-22 11:03:37 +10001096 err = register_netdev(dev);
1097 if (err) {
1098 pr_debug("virtio_net: registering device failed\n");
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001099 goto free_vqs;
Rusty Russell296f96f2007-10-22 11:03:37 +10001100 }
Rusty Russellb3369c12008-02-04 23:50:02 -05001101
1102 /* Last of all, set up some receive buffers. */
Rusty Russell3161e452009-08-26 12:22:32 -07001103 try_fill_recv(vi, GFP_KERNEL);
Rusty Russellb3369c12008-02-04 23:50:02 -05001104
1105 /* If we didn't even get one input buffer, we're useless. */
1106 if (vi->num == 0) {
1107 err = -ENOMEM;
1108 goto unregister;
1109 }
1110
Jason Wang167c25e2010-11-10 14:45:41 +00001111 /* Assume link up if device can't report link status,
1112 otherwise get link status from config. */
1113 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1114 netif_carrier_off(dev);
1115 virtnet_update_status(vi);
1116 } else {
1117 vi->status = VIRTIO_NET_S_LINK_UP;
1118 netif_carrier_on(dev);
1119 }
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -08001120
Rusty Russell296f96f2007-10-22 11:03:37 +10001121 pr_debug("virtnet: registered device %s\n", dev->name);
Rusty Russell296f96f2007-10-22 11:03:37 +10001122 return 0;
1123
Rusty Russellb3369c12008-02-04 23:50:02 -05001124unregister:
1125 unregister_netdev(dev);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001126free_vqs:
1127 vdev->config->del_vqs(vdev);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +00001128free_stats:
1129 free_percpu(vi->stats);
Rusty Russell296f96f2007-10-22 11:03:37 +10001130free:
1131 free_netdev(dev);
1132 return err;
1133}
1134
Shirley Ma9ab86bb2010-01-29 03:20:04 +00001135static void free_unused_bufs(struct virtnet_info *vi)
1136{
1137 void *buf;
1138 while (1) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +03001139 buf = virtqueue_detach_unused_buf(vi->svq);
Shirley Ma830a8a92010-02-08 14:14:42 +00001140 if (!buf)
1141 break;
1142 dev_kfree_skb(buf);
1143 }
1144 while (1) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +03001145 buf = virtqueue_detach_unused_buf(vi->rvq);
Shirley Ma9ab86bb2010-01-29 03:20:04 +00001146 if (!buf)
1147 break;
1148 if (vi->mergeable_rx_bufs || vi->big_packets)
1149 give_pages(vi, buf);
1150 else
1151 dev_kfree_skb(buf);
1152 --vi->num;
1153 }
1154 BUG_ON(vi->num != 0);
1155}
1156
Amit Shah04486ed2011-12-22 16:58:32 +05301157static void remove_vq_common(struct virtnet_info *vi)
Rusty Russell296f96f2007-10-22 11:03:37 +10001158{
Amit Shah04486ed2011-12-22 16:58:32 +05301159 vi->vdev->config->reset(vi->vdev);
Shirley Ma830a8a92010-02-08 14:14:42 +00001160
1161 /* Free unused buffers in both send and recv, if any. */
Shirley Ma9ab86bb2010-01-29 03:20:04 +00001162 free_unused_bufs(vi);
Rusty Russellfb6813f2008-07-25 12:06:01 -05001163
Amit Shah04486ed2011-12-22 16:58:32 +05301164 vi->vdev->config->del_vqs(vi->vdev);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001165
Rusty Russellfb6813f2008-07-25 12:06:01 -05001166 while (vi->pages)
1167 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
Amit Shah04486ed2011-12-22 16:58:32 +05301168}
1169
1170static void __devexit virtnet_remove(struct virtio_device *vdev)
1171{
1172 struct virtnet_info *vi = vdev->priv;
1173
1174 unregister_netdev(vi->dev);
1175
1176 remove_vq_common(vi);
Rusty Russellfb6813f2008-07-25 12:06:01 -05001177
Krishna Kumar2e66f552011-07-20 03:56:02 +00001178 free_percpu(vi->stats);
Rusty Russell74b25532007-11-19 11:20:42 -05001179 free_netdev(vi->dev);
Rusty Russell296f96f2007-10-22 11:03:37 +10001180}
1181
Amit Shah0741bcb2011-12-22 16:58:33 +05301182#ifdef CONFIG_PM
1183static int virtnet_freeze(struct virtio_device *vdev)
1184{
1185 struct virtnet_info *vi = vdev->priv;
1186
1187 virtqueue_disable_cb(vi->rvq);
1188 virtqueue_disable_cb(vi->svq);
1189 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ))
1190 virtqueue_disable_cb(vi->cvq);
1191
1192 netif_device_detach(vi->dev);
1193 cancel_delayed_work_sync(&vi->refill);
1194
1195 if (netif_running(vi->dev))
1196 napi_disable(&vi->napi);
1197
1198 remove_vq_common(vi);
1199
1200 return 0;
1201}
1202
1203static int virtnet_restore(struct virtio_device *vdev)
1204{
1205 struct virtnet_info *vi = vdev->priv;
1206 int err;
1207
1208 err = init_vqs(vi);
1209 if (err)
1210 return err;
1211
1212 if (netif_running(vi->dev))
1213 virtnet_napi_enable(vi);
1214
1215 netif_device_attach(vi->dev);
1216
1217 if (!try_fill_recv(vi, GFP_KERNEL))
1218 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
1219
1220 return 0;
1221}
1222#endif
1223
Rusty Russell296f96f2007-10-22 11:03:37 +10001224static struct virtio_device_id id_table[] = {
1225 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1226 { 0 },
1227};
1228
Rusty Russellc45a6812008-05-02 21:50:50 -05001229static unsigned int features[] = {
Mark McLoughlin5e4fe5c2008-07-08 17:10:42 +10001230 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1231 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
Rusty Russellc45a6812008-05-02 21:50:50 -05001232 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
Herbert Xu97402b92008-04-18 11:24:27 +08001233 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
Sridhar Samudrala5c516752009-07-14 14:21:02 +00001234 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
Alex Williamson2a41f712009-02-04 09:02:34 +00001235 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
Alex Williamson0bde95692009-02-04 09:02:50 +00001236 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
Rusty Russellc45a6812008-05-02 21:50:50 -05001237};
1238
Uwe Kleine-König22402522009-11-05 01:32:44 -08001239static struct virtio_driver virtio_net_driver = {
Rusty Russellc45a6812008-05-02 21:50:50 -05001240 .feature_table = features,
1241 .feature_table_size = ARRAY_SIZE(features),
Rusty Russell296f96f2007-10-22 11:03:37 +10001242 .driver.name = KBUILD_MODNAME,
1243 .driver.owner = THIS_MODULE,
1244 .id_table = id_table,
1245 .probe = virtnet_probe,
1246 .remove = __devexit_p(virtnet_remove),
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -08001247 .config_changed = virtnet_config_changed,
Amit Shah0741bcb2011-12-22 16:58:33 +05301248#ifdef CONFIG_PM
1249 .freeze = virtnet_freeze,
1250 .restore = virtnet_restore,
1251#endif
Rusty Russell296f96f2007-10-22 11:03:37 +10001252};
1253
1254static int __init init(void)
1255{
Uwe Kleine-König22402522009-11-05 01:32:44 -08001256 return register_virtio_driver(&virtio_net_driver);
Rusty Russell296f96f2007-10-22 11:03:37 +10001257}
1258
1259static void __exit fini(void)
1260{
Uwe Kleine-König22402522009-11-05 01:32:44 -08001261 unregister_virtio_driver(&virtio_net_driver);
Rusty Russell296f96f2007-10-22 11:03:37 +10001262}
1263module_init(init);
1264module_exit(fini);
1265
1266MODULE_DEVICE_TABLE(virtio, id_table);
1267MODULE_DESCRIPTION("Virtio network driver");
1268MODULE_LICENSE("GPL");