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Commit | Line | Data |
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48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
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> | |
a9ea3fc6 | 22 | #include <linux/ethtool.h> |
296f96fc RR |
23 | #include <linux/module.h> |
24 | #include <linux/virtio.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/scatterlist.h> | |
e918085a | 27 | #include <linux/if_vlan.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
296f96fc | 29 | |
6c0cd7c0 DL |
30 | static int napi_weight = 128; |
31 | module_param(napi_weight, int, 0444); | |
32 | ||
eb939922 | 33 | static bool csum = true, gso = true; |
34a48579 RR |
34 | module_param(csum, bool, 0444); |
35 | module_param(gso, bool, 0444); | |
36 | ||
296f96fc | 37 | /* FIXME: MTU in config. */ |
e918085a | 38 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 39 | #define GOOD_COPY_LEN 128 |
296f96fc | 40 | |
f565a7c2 | 41 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
66846048 | 42 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 43 | |
3fa2a1df | 44 | struct virtnet_stats { |
83a27052 ED |
45 | struct u64_stats_sync tx_syncp; |
46 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 47 | u64 tx_bytes; |
48 | u64 tx_packets; | |
49 | ||
50 | u64 rx_bytes; | |
51 | u64 rx_packets; | |
52 | }; | |
53 | ||
e9d7417b JW |
54 | /* Internal representation of a send virtqueue */ |
55 | struct send_queue { | |
56 | /* Virtqueue associated with this send _queue */ | |
57 | struct virtqueue *vq; | |
58 | ||
59 | /* TX: fragments + linear part + virtio header */ | |
60 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
61 | }; | |
62 | ||
63 | /* Internal representation of a receive virtqueue */ | |
64 | struct receive_queue { | |
65 | /* Virtqueue associated with this receive_queue */ | |
66 | struct virtqueue *vq; | |
67 | ||
296f96fc RR |
68 | struct napi_struct napi; |
69 | ||
70 | /* Number of input buffers, and max we've ever had. */ | |
71 | unsigned int num, max; | |
72 | ||
e9d7417b JW |
73 | /* Chain pages by the private ptr. */ |
74 | struct page *pages; | |
75 | ||
76 | /* RX: fragments + linear part + virtio header */ | |
77 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
78 | }; | |
79 | ||
80 | struct virtnet_info { | |
81 | struct virtio_device *vdev; | |
82 | struct virtqueue *cvq; | |
83 | struct net_device *dev; | |
84 | struct send_queue sq; | |
85 | struct receive_queue rq; | |
86 | unsigned int status; | |
87 | ||
97402b96 HX |
88 | /* I like... big packets and I cannot lie! */ |
89 | bool big_packets; | |
90 | ||
3f2c31d9 MM |
91 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
92 | bool mergeable_rx_bufs; | |
93 | ||
586d17c5 JW |
94 | /* enable config space updates */ |
95 | bool config_enable; | |
96 | ||
3fa2a1df | 97 | /* Active statistics */ |
98 | struct virtnet_stats __percpu *stats; | |
99 | ||
3161e453 RR |
100 | /* Work struct for refilling if we run low on memory. */ |
101 | struct delayed_work refill; | |
102 | ||
586d17c5 JW |
103 | /* Work struct for config space updates */ |
104 | struct work_struct config_work; | |
105 | ||
106 | /* Lock for config space updates */ | |
107 | struct mutex config_lock; | |
296f96fc RR |
108 | }; |
109 | ||
b3f24698 RR |
110 | struct skb_vnet_hdr { |
111 | union { | |
112 | struct virtio_net_hdr hdr; | |
113 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
114 | }; | |
48925e37 | 115 | unsigned int num_sg; |
b3f24698 RR |
116 | }; |
117 | ||
9ab86bbc SM |
118 | struct padded_vnet_hdr { |
119 | struct virtio_net_hdr hdr; | |
120 | /* | |
121 | * virtio_net_hdr should be in a separated sg buffer because of a | |
122 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
123 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
124 | */ | |
125 | char padding[6]; | |
126 | }; | |
127 | ||
b3f24698 | 128 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 129 | { |
b3f24698 | 130 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
131 | } |
132 | ||
9ab86bbc SM |
133 | /* |
134 | * private is used to chain pages for big packets, put the whole | |
135 | * most recent used list in the beginning for reuse | |
136 | */ | |
e9d7417b | 137 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 138 | { |
9ab86bbc | 139 | struct page *end; |
0a888fd1 | 140 | |
e9d7417b | 141 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 142 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
143 | end->private = (unsigned long)rq->pages; |
144 | rq->pages = page; | |
0a888fd1 MM |
145 | } |
146 | ||
e9d7417b | 147 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 148 | { |
e9d7417b | 149 | struct page *p = rq->pages; |
fb6813f4 | 150 | |
9ab86bbc | 151 | if (p) { |
e9d7417b | 152 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
153 | /* clear private here, it is used to chain pages */ |
154 | p->private = 0; | |
155 | } else | |
fb6813f4 RR |
156 | p = alloc_page(gfp_mask); |
157 | return p; | |
158 | } | |
159 | ||
e9d7417b | 160 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 161 | { |
e9d7417b | 162 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 163 | |
2cb9c6ba | 164 | /* Suppress further interrupts. */ |
e9d7417b | 165 | virtqueue_disable_cb(vq); |
11a3a154 | 166 | |
363f1514 | 167 | /* We were probably waiting for more output buffers. */ |
296f96fc | 168 | netif_wake_queue(vi->dev); |
296f96fc RR |
169 | } |
170 | ||
9ab86bbc SM |
171 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
172 | unsigned int offset, unsigned int *len) | |
296f96fc | 173 | { |
8a59a7b9 | 174 | int size = min((unsigned)PAGE_SIZE - offset, *len); |
9ab86bbc | 175 | int i = skb_shinfo(skb)->nr_frags; |
9ab86bbc | 176 | |
8a59a7b9 | 177 | __skb_fill_page_desc(skb, i, page, offset, size); |
9ab86bbc | 178 | |
8a59a7b9 KK |
179 | skb->data_len += size; |
180 | skb->len += size; | |
4b727361 | 181 | skb->truesize += PAGE_SIZE; |
9ab86bbc | 182 | skb_shinfo(skb)->nr_frags++; |
8a59a7b9 | 183 | *len -= size; |
9ab86bbc | 184 | } |
23cde76d | 185 | |
3464645a | 186 | /* Called from bottom half context */ |
e9d7417b | 187 | static struct sk_buff *page_to_skb(struct receive_queue *rq, |
9ab86bbc SM |
188 | struct page *page, unsigned int len) |
189 | { | |
e9d7417b | 190 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc SM |
191 | struct sk_buff *skb; |
192 | struct skb_vnet_hdr *hdr; | |
193 | unsigned int copy, hdr_len, offset; | |
194 | char *p; | |
fb6813f4 | 195 | |
9ab86bbc | 196 | p = page_address(page); |
3f2c31d9 | 197 | |
9ab86bbc SM |
198 | /* copy small packet so we can reuse these pages for small data */ |
199 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
200 | if (unlikely(!skb)) | |
201 | return NULL; | |
3f2c31d9 | 202 | |
9ab86bbc | 203 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 204 | |
9ab86bbc SM |
205 | if (vi->mergeable_rx_bufs) { |
206 | hdr_len = sizeof hdr->mhdr; | |
207 | offset = hdr_len; | |
208 | } else { | |
209 | hdr_len = sizeof hdr->hdr; | |
210 | offset = sizeof(struct padded_vnet_hdr); | |
211 | } | |
3f2c31d9 | 212 | |
9ab86bbc | 213 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 214 | |
9ab86bbc SM |
215 | len -= hdr_len; |
216 | p += offset; | |
3f2c31d9 | 217 | |
9ab86bbc SM |
218 | copy = len; |
219 | if (copy > skb_tailroom(skb)) | |
220 | copy = skb_tailroom(skb); | |
221 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 222 | |
9ab86bbc SM |
223 | len -= copy; |
224 | offset += copy; | |
3f2c31d9 | 225 | |
e878d78b SL |
226 | /* |
227 | * Verify that we can indeed put this data into a skb. | |
228 | * This is here to handle cases when the device erroneously | |
229 | * tries to receive more than is possible. This is usually | |
230 | * the case of a broken device. | |
231 | */ | |
232 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 233 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
234 | dev_kfree_skb(skb); |
235 | return NULL; | |
236 | } | |
237 | ||
9ab86bbc SM |
238 | while (len) { |
239 | set_skb_frag(skb, page, offset, &len); | |
240 | page = (struct page *)page->private; | |
241 | offset = 0; | |
242 | } | |
3f2c31d9 | 243 | |
9ab86bbc | 244 | if (page) |
e9d7417b | 245 | give_pages(rq, page); |
3f2c31d9 | 246 | |
9ab86bbc SM |
247 | return skb; |
248 | } | |
3f2c31d9 | 249 | |
e9d7417b | 250 | static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb) |
9ab86bbc SM |
251 | { |
252 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
253 | struct page *page; | |
254 | int num_buf, i, len; | |
255 | ||
256 | num_buf = hdr->mhdr.num_buffers; | |
257 | while (--num_buf) { | |
258 | i = skb_shinfo(skb)->nr_frags; | |
259 | if (i >= MAX_SKB_FRAGS) { | |
260 | pr_debug("%s: packet too long\n", skb->dev->name); | |
261 | skb->dev->stats.rx_length_errors++; | |
262 | return -EINVAL; | |
263 | } | |
e9d7417b | 264 | page = virtqueue_get_buf(rq->vq, &len); |
9ab86bbc SM |
265 | if (!page) { |
266 | pr_debug("%s: rx error: %d buffers missing\n", | |
267 | skb->dev->name, hdr->mhdr.num_buffers); | |
268 | skb->dev->stats.rx_length_errors++; | |
269 | return -EINVAL; | |
3f2c31d9 | 270 | } |
3fa2a1df | 271 | |
9ab86bbc SM |
272 | if (len > PAGE_SIZE) |
273 | len = PAGE_SIZE; | |
274 | ||
275 | set_skb_frag(skb, page, 0, &len); | |
276 | ||
e9d7417b | 277 | --rq->num; |
9ab86bbc SM |
278 | } |
279 | return 0; | |
280 | } | |
281 | ||
e9d7417b | 282 | static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) |
9ab86bbc | 283 | { |
e9d7417b JW |
284 | struct virtnet_info *vi = rq->vq->vdev->priv; |
285 | struct net_device *dev = vi->dev; | |
58472a76 | 286 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
287 | struct sk_buff *skb; |
288 | struct page *page; | |
289 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 290 | |
9ab86bbc SM |
291 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
292 | pr_debug("%s: short packet %i\n", dev->name, len); | |
293 | dev->stats.rx_length_errors++; | |
294 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
e9d7417b | 295 | give_pages(rq, buf); |
9ab86bbc SM |
296 | else |
297 | dev_kfree_skb(buf); | |
298 | return; | |
299 | } | |
3f2c31d9 | 300 | |
9ab86bbc SM |
301 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
302 | skb = buf; | |
303 | len -= sizeof(struct virtio_net_hdr); | |
304 | skb_trim(skb, len); | |
305 | } else { | |
306 | page = buf; | |
e9d7417b | 307 | skb = page_to_skb(rq, page, len); |
9ab86bbc | 308 | if (unlikely(!skb)) { |
3f2c31d9 | 309 | dev->stats.rx_dropped++; |
e9d7417b | 310 | give_pages(rq, page); |
9ab86bbc | 311 | return; |
3f2c31d9 | 312 | } |
9ab86bbc | 313 | if (vi->mergeable_rx_bufs) |
e9d7417b | 314 | if (receive_mergeable(rq, skb)) { |
9ab86bbc SM |
315 | dev_kfree_skb(skb); |
316 | return; | |
317 | } | |
97402b96 | 318 | } |
3f2c31d9 | 319 | |
9ab86bbc | 320 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 321 | |
83a27052 | 322 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 323 | stats->rx_bytes += skb->len; |
324 | stats->rx_packets++; | |
83a27052 | 325 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 326 | |
b3f24698 | 327 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 328 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
329 | if (!skb_partial_csum_set(skb, |
330 | hdr->hdr.csum_start, | |
331 | hdr->hdr.csum_offset)) | |
296f96fc | 332 | goto frame_err; |
10a8d94a JW |
333 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
334 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
335 | } |
336 | ||
23cde76d MM |
337 | skb->protocol = eth_type_trans(skb, dev); |
338 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
339 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
340 | ||
b3f24698 | 341 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 342 | pr_debug("GSO!\n"); |
b3f24698 | 343 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
344 | case VIRTIO_NET_HDR_GSO_TCPV4: |
345 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
346 | break; | |
296f96fc RR |
347 | case VIRTIO_NET_HDR_GSO_UDP: |
348 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
349 | break; | |
350 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
351 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
352 | break; | |
353 | default: | |
be443899 AW |
354 | net_warn_ratelimited("%s: bad gso type %u.\n", |
355 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
356 | goto frame_err; |
357 | } | |
358 | ||
b3f24698 | 359 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
360 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
361 | ||
b3f24698 | 362 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 363 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 364 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
365 | goto frame_err; |
366 | } | |
367 | ||
368 | /* Header must be checked, and gso_segs computed. */ | |
369 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
370 | skb_shinfo(skb)->gso_segs = 0; | |
371 | } | |
372 | ||
373 | netif_receive_skb(skb); | |
374 | return; | |
375 | ||
376 | frame_err: | |
377 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
378 | dev_kfree_skb(skb); |
379 | } | |
380 | ||
e9d7417b | 381 | static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) |
296f96fc | 382 | { |
e9d7417b | 383 | struct virtnet_info *vi = rq->vq->vdev->priv; |
296f96fc | 384 | struct sk_buff *skb; |
9ab86bbc | 385 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 386 | int err; |
3f2c31d9 | 387 | |
3464645a | 388 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
389 | if (unlikely(!skb)) |
390 | return -ENOMEM; | |
296f96fc | 391 | |
9ab86bbc | 392 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 393 | |
9ab86bbc | 394 | hdr = skb_vnet_hdr(skb); |
e9d7417b | 395 | sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 396 | |
e9d7417b | 397 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 398 | |
e9d7417b | 399 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp); |
9ab86bbc SM |
400 | if (err < 0) |
401 | dev_kfree_skb(skb); | |
97402b96 | 402 | |
9ab86bbc SM |
403 | return err; |
404 | } | |
97402b96 | 405 | |
e9d7417b | 406 | static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 407 | { |
9ab86bbc SM |
408 | struct page *first, *list = NULL; |
409 | char *p; | |
410 | int i, err, offset; | |
411 | ||
e9d7417b | 412 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 413 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 414 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
415 | if (!first) { |
416 | if (list) | |
e9d7417b | 417 | give_pages(rq, list); |
9ab86bbc | 418 | return -ENOMEM; |
97402b96 | 419 | } |
e9d7417b | 420 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 421 | |
9ab86bbc SM |
422 | /* chain new page in list head to match sg */ |
423 | first->private = (unsigned long)list; | |
424 | list = first; | |
425 | } | |
296f96fc | 426 | |
e9d7417b | 427 | first = get_a_page(rq, gfp); |
9ab86bbc | 428 | if (!first) { |
e9d7417b | 429 | give_pages(rq, list); |
9ab86bbc SM |
430 | return -ENOMEM; |
431 | } | |
432 | p = page_address(first); | |
433 | ||
e9d7417b JW |
434 | /* rq->sg[0], rq->sg[1] share the same page */ |
435 | /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ | |
436 | sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 437 | |
e9d7417b | 438 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 439 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 440 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
441 | |
442 | /* chain first in list head */ | |
443 | first->private = (unsigned long)list; | |
e9d7417b | 444 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2, |
f96fde41 | 445 | first, gfp); |
9ab86bbc | 446 | if (err < 0) |
e9d7417b | 447 | give_pages(rq, first); |
9ab86bbc SM |
448 | |
449 | return err; | |
296f96fc RR |
450 | } |
451 | ||
e9d7417b | 452 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) |
3f2c31d9 | 453 | { |
9ab86bbc | 454 | struct page *page; |
3f2c31d9 | 455 | int err; |
3f2c31d9 | 456 | |
e9d7417b | 457 | page = get_a_page(rq, gfp); |
9ab86bbc SM |
458 | if (!page) |
459 | return -ENOMEM; | |
3f2c31d9 | 460 | |
e9d7417b | 461 | sg_init_one(rq->sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 462 | |
e9d7417b | 463 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp); |
9ab86bbc | 464 | if (err < 0) |
e9d7417b | 465 | give_pages(rq, page); |
3f2c31d9 | 466 | |
9ab86bbc SM |
467 | return err; |
468 | } | |
3f2c31d9 | 469 | |
b2baed69 RR |
470 | /* |
471 | * Returns false if we couldn't fill entirely (OOM). | |
472 | * | |
473 | * Normally run in the receive path, but can also be run from ndo_open | |
474 | * before we're receiving packets, or from refill_work which is | |
475 | * careful to disable receiving (using napi_disable). | |
476 | */ | |
e9d7417b | 477 | static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 478 | { |
e9d7417b | 479 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc | 480 | int err; |
1788f495 | 481 | bool oom; |
3f2c31d9 | 482 | |
9ab86bbc SM |
483 | do { |
484 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 485 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 486 | else if (vi->big_packets) |
e9d7417b | 487 | err = add_recvbuf_big(rq, gfp); |
9ab86bbc | 488 | else |
e9d7417b | 489 | err = add_recvbuf_small(rq, gfp); |
3f2c31d9 | 490 | |
1788f495 MT |
491 | oom = err == -ENOMEM; |
492 | if (err < 0) | |
3f2c31d9 | 493 | break; |
e9d7417b | 494 | ++rq->num; |
0aea51c3 | 495 | } while (err > 0); |
e9d7417b JW |
496 | if (unlikely(rq->num > rq->max)) |
497 | rq->max = rq->num; | |
498 | virtqueue_kick(rq->vq); | |
3161e453 | 499 | return !oom; |
3f2c31d9 MM |
500 | } |
501 | ||
18445c4d | 502 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
503 | { |
504 | struct virtnet_info *vi = rvq->vdev->priv; | |
e9d7417b JW |
505 | struct receive_queue *rq = &vi->rq; |
506 | ||
18445c4d | 507 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 508 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 509 | virtqueue_disable_cb(rvq); |
e9d7417b | 510 | __napi_schedule(&rq->napi); |
18445c4d | 511 | } |
296f96fc RR |
512 | } |
513 | ||
e9d7417b | 514 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 515 | { |
e9d7417b | 516 | napi_enable(&rq->napi); |
3e9d08ec BR |
517 | |
518 | /* If all buffers were filled by other side before we napi_enabled, we | |
519 | * won't get another interrupt, so process any outstanding packets | |
520 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
521 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
522 | if (napi_schedule_prep(&rq->napi)) { |
523 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 524 | local_bh_disable(); |
e9d7417b | 525 | __napi_schedule(&rq->napi); |
ec13ee80 | 526 | local_bh_enable(); |
3e9d08ec BR |
527 | } |
528 | } | |
529 | ||
3161e453 RR |
530 | static void refill_work(struct work_struct *work) |
531 | { | |
e9d7417b JW |
532 | struct virtnet_info *vi = |
533 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 RR |
534 | bool still_empty; |
535 | ||
e9d7417b JW |
536 | napi_disable(&vi->rq.napi); |
537 | still_empty = !try_fill_recv(&vi->rq, GFP_KERNEL); | |
538 | virtnet_napi_enable(&vi->rq); | |
3161e453 RR |
539 | |
540 | /* In theory, this can happen: if we don't get any buffers in | |
541 | * we will *never* try to fill again. */ | |
542 | if (still_empty) | |
3b07e9ca | 543 | schedule_delayed_work(&vi->refill, HZ/2); |
3161e453 RR |
544 | } |
545 | ||
296f96fc RR |
546 | static int virtnet_poll(struct napi_struct *napi, int budget) |
547 | { | |
e9d7417b JW |
548 | struct receive_queue *rq = |
549 | container_of(napi, struct receive_queue, napi); | |
550 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
9ab86bbc | 551 | void *buf; |
296f96fc RR |
552 | unsigned int len, received = 0; |
553 | ||
554 | again: | |
555 | while (received < budget && | |
e9d7417b JW |
556 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
557 | receive_buf(rq, buf, len); | |
558 | --rq->num; | |
296f96fc RR |
559 | received++; |
560 | } | |
561 | ||
e9d7417b JW |
562 | if (rq->num < rq->max / 2) { |
563 | if (!try_fill_recv(rq, GFP_ATOMIC)) | |
3b07e9ca | 564 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 565 | } |
296f96fc | 566 | |
8329d98e RR |
567 | /* Out of packets? */ |
568 | if (received < budget) { | |
288379f0 | 569 | napi_complete(napi); |
e9d7417b | 570 | if (unlikely(!virtqueue_enable_cb(rq->vq)) && |
8e95a202 | 571 | napi_schedule_prep(napi)) { |
e9d7417b | 572 | virtqueue_disable_cb(rq->vq); |
288379f0 | 573 | __napi_schedule(napi); |
296f96fc | 574 | goto again; |
4265f161 | 575 | } |
296f96fc RR |
576 | } |
577 | ||
578 | return received; | |
579 | } | |
580 | ||
e9d7417b | 581 | static unsigned int free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
582 | { |
583 | struct sk_buff *skb; | |
48925e37 | 584 | unsigned int len, tot_sgs = 0; |
e9d7417b | 585 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 586 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 587 | |
e9d7417b | 588 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 589 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 590 | |
83a27052 | 591 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 592 | stats->tx_bytes += skb->len; |
593 | stats->tx_packets++; | |
83a27052 | 594 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 595 | |
48925e37 | 596 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
ed79bab8 | 597 | dev_kfree_skb_any(skb); |
296f96fc | 598 | } |
48925e37 | 599 | return tot_sgs; |
296f96fc RR |
600 | } |
601 | ||
e9d7417b | 602 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 603 | { |
b3f24698 | 604 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 605 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 606 | struct virtnet_info *vi = sq->vq->vdev->priv; |
296f96fc | 607 | |
e174961c | 608 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 609 | |
296f96fc | 610 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 611 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 612 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 613 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 614 | } else { |
b3f24698 RR |
615 | hdr->hdr.flags = 0; |
616 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
617 | } |
618 | ||
619 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
620 | hdr->hdr.hdr_len = skb_headlen(skb); |
621 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 622 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 623 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 624 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 625 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 626 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 627 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
628 | else |
629 | BUG(); | |
34a48579 | 630 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 631 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 632 | } else { |
b3f24698 RR |
633 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
634 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
635 | } |
636 | ||
b3f24698 | 637 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
638 | |
639 | /* Encode metadata header at front. */ | |
640 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 641 | sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 642 | else |
e9d7417b | 643 | sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 644 | |
e9d7417b JW |
645 | hdr->num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; |
646 | return virtqueue_add_buf(sq->vq, sq->sg, hdr->num_sg, | |
f96fde41 | 647 | 0, skb, GFP_ATOMIC); |
11a3a154 RR |
648 | } |
649 | ||
424efe9c | 650 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
651 | { |
652 | struct virtnet_info *vi = netdev_priv(dev); | |
e9d7417b | 653 | struct send_queue *sq = &vi->sq; |
48925e37 | 654 | int capacity; |
2cb9c6ba | 655 | |
2cb9c6ba | 656 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 657 | free_old_xmit_skbs(sq); |
99ffc696 | 658 | |
03f191ba | 659 | /* Try to transmit */ |
e9d7417b | 660 | capacity = xmit_skb(sq, skb); |
48925e37 RR |
661 | |
662 | /* This can happen with OOM and indirect buffers. */ | |
663 | if (unlikely(capacity < 0)) { | |
2e57b79c | 664 | if (likely(capacity == -ENOMEM)) { |
31304165 | 665 | if (net_ratelimit()) |
58eba97d RR |
666 | dev_warn(&dev->dev, |
667 | "TX queue failure: out of memory\n"); | |
31304165 | 668 | } else { |
2e57b79c RJ |
669 | dev->stats.tx_fifo_errors++; |
670 | if (net_ratelimit()) | |
58eba97d RR |
671 | dev_warn(&dev->dev, |
672 | "Unexpected TX queue failure: %d\n", | |
673 | capacity); | |
48925e37 | 674 | } |
58eba97d RR |
675 | dev->stats.tx_dropped++; |
676 | kfree_skb(skb); | |
677 | return NETDEV_TX_OK; | |
296f96fc | 678 | } |
e9d7417b | 679 | virtqueue_kick(sq->vq); |
03f191ba | 680 | |
48925e37 RR |
681 | /* Don't wait up for transmitted skbs to be freed. */ |
682 | skb_orphan(skb); | |
683 | nf_reset(skb); | |
684 | ||
685 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
686 | * before it gets out of hand. Naturally, this wastes entries. */ | |
687 | if (capacity < 2+MAX_SKB_FRAGS) { | |
688 | netif_stop_queue(dev); | |
e9d7417b | 689 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 690 | /* More just got used, free them then recheck. */ |
e9d7417b | 691 | capacity += free_old_xmit_skbs(sq); |
48925e37 RR |
692 | if (capacity >= 2+MAX_SKB_FRAGS) { |
693 | netif_start_queue(dev); | |
e9d7417b | 694 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
695 | } |
696 | } | |
99ffc696 | 697 | } |
48925e37 RR |
698 | |
699 | return NETDEV_TX_OK; | |
296f96fc RR |
700 | } |
701 | ||
9c46f6d4 AW |
702 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
703 | { | |
704 | struct virtnet_info *vi = netdev_priv(dev); | |
705 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 706 | int ret; |
9c46f6d4 | 707 | |
f2f2c8b4 JP |
708 | ret = eth_mac_addr(dev, p); |
709 | if (ret) | |
710 | return ret; | |
9c46f6d4 | 711 | |
62994b2d AW |
712 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
713 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
714 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
3fa2a1df | 719 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
720 | struct rtnl_link_stats64 *tot) | |
721 | { | |
722 | struct virtnet_info *vi = netdev_priv(dev); | |
723 | int cpu; | |
724 | unsigned int start; | |
725 | ||
726 | for_each_possible_cpu(cpu) { | |
58472a76 | 727 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 728 | u64 tpackets, tbytes, rpackets, rbytes; |
729 | ||
730 | do { | |
e3906486 | 731 | start = u64_stats_fetch_begin_bh(&stats->tx_syncp); |
3fa2a1df | 732 | tpackets = stats->tx_packets; |
733 | tbytes = stats->tx_bytes; | |
e3906486 | 734 | } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); |
83a27052 ED |
735 | |
736 | do { | |
e3906486 | 737 | start = u64_stats_fetch_begin_bh(&stats->rx_syncp); |
3fa2a1df | 738 | rpackets = stats->rx_packets; |
739 | rbytes = stats->rx_bytes; | |
e3906486 | 740 | } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); |
3fa2a1df | 741 | |
742 | tot->rx_packets += rpackets; | |
743 | tot->tx_packets += tpackets; | |
744 | tot->rx_bytes += rbytes; | |
745 | tot->tx_bytes += tbytes; | |
746 | } | |
747 | ||
748 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 749 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 750 | tot->rx_dropped = dev->stats.rx_dropped; |
751 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
752 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
753 | ||
754 | return tot; | |
755 | } | |
756 | ||
da74e89d AS |
757 | #ifdef CONFIG_NET_POLL_CONTROLLER |
758 | static void virtnet_netpoll(struct net_device *dev) | |
759 | { | |
760 | struct virtnet_info *vi = netdev_priv(dev); | |
761 | ||
e9d7417b | 762 | napi_schedule(&vi->rq.napi); |
da74e89d AS |
763 | } |
764 | #endif | |
765 | ||
296f96fc RR |
766 | static int virtnet_open(struct net_device *dev) |
767 | { | |
768 | struct virtnet_info *vi = netdev_priv(dev); | |
769 | ||
b2baed69 | 770 | /* Make sure we have some buffers: if oom use wq. */ |
e9d7417b | 771 | if (!try_fill_recv(&vi->rq, GFP_KERNEL)) |
3b07e9ca | 772 | schedule_delayed_work(&vi->refill, 0); |
b2baed69 | 773 | |
e9d7417b | 774 | virtnet_napi_enable(&vi->rq); |
296f96fc RR |
775 | return 0; |
776 | } | |
777 | ||
2a41f71d AW |
778 | /* |
779 | * Send command via the control virtqueue and check status. Commands | |
780 | * supported by the hypervisor, as indicated by feature bits, should | |
781 | * never fail unless improperly formated. | |
782 | */ | |
783 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
784 | struct scatterlist *data, int out, int in) | |
785 | { | |
23e258e1 | 786 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
787 | struct virtio_net_ctrl_hdr ctrl; |
788 | virtio_net_ctrl_ack status = ~0; | |
789 | unsigned int tmp; | |
23e258e1 | 790 | int i; |
2a41f71d | 791 | |
0ee904c3 AB |
792 | /* Caller should know better */ |
793 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
794 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
795 | |
796 | out++; /* Add header */ | |
797 | in++; /* Add return status */ | |
798 | ||
799 | ctrl.class = class; | |
800 | ctrl.cmd = cmd; | |
801 | ||
802 | sg_init_table(sg, out + in); | |
803 | ||
804 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
805 | for_each_sg(data, s, out + in - 2, i) |
806 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
807 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
808 | ||
f96fde41 | 809 | BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); |
2a41f71d | 810 | |
1915a712 | 811 | virtqueue_kick(vi->cvq); |
2a41f71d AW |
812 | |
813 | /* | |
814 | * Spin for a response, the kick causes an ioport write, trapping | |
815 | * into the hypervisor, so the request should be handled immediately. | |
816 | */ | |
1915a712 | 817 | while (!virtqueue_get_buf(vi->cvq, &tmp)) |
2a41f71d AW |
818 | cpu_relax(); |
819 | ||
820 | return status == VIRTIO_NET_OK; | |
821 | } | |
822 | ||
586d17c5 JW |
823 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
824 | { | |
825 | rtnl_lock(); | |
826 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
827 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, | |
828 | 0, 0)) | |
829 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); | |
830 | rtnl_unlock(); | |
831 | } | |
832 | ||
296f96fc RR |
833 | static int virtnet_close(struct net_device *dev) |
834 | { | |
835 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc | 836 | |
b2baed69 RR |
837 | /* Make sure refill_work doesn't re-enable napi! */ |
838 | cancel_delayed_work_sync(&vi->refill); | |
e9d7417b | 839 | napi_disable(&vi->rq.napi); |
296f96fc | 840 | |
296f96fc RR |
841 | return 0; |
842 | } | |
843 | ||
2af7698e AW |
844 | static void virtnet_set_rx_mode(struct net_device *dev) |
845 | { | |
846 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 847 | struct scatterlist sg[2]; |
2af7698e | 848 | u8 promisc, allmulti; |
f565a7c2 | 849 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 850 | struct netdev_hw_addr *ha; |
32e7bfc4 | 851 | int uc_count; |
4cd24eaf | 852 | int mc_count; |
f565a7c2 AW |
853 | void *buf; |
854 | int i; | |
2af7698e AW |
855 | |
856 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
857 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
858 | return; | |
859 | ||
f565a7c2 AW |
860 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
861 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 862 | |
23e258e1 | 863 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
864 | |
865 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
866 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 867 | sg, 1, 0)) |
2af7698e AW |
868 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
869 | promisc ? "en" : "dis"); | |
870 | ||
23e258e1 | 871 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
872 | |
873 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
874 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 875 | sg, 1, 0)) |
2af7698e AW |
876 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
877 | allmulti ? "en" : "dis"); | |
f565a7c2 | 878 | |
32e7bfc4 | 879 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 880 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 881 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
882 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
883 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
884 | mac_data = buf; | |
f565a7c2 AW |
885 | if (!buf) { |
886 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
887 | return; | |
888 | } | |
889 | ||
23e258e1 AW |
890 | sg_init_table(sg, 2); |
891 | ||
f565a7c2 | 892 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 893 | mac_data->entries = uc_count; |
ccffad25 | 894 | i = 0; |
32e7bfc4 | 895 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 896 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
897 | |
898 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 899 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
900 | |
901 | /* multicast list and count fill the end */ | |
32e7bfc4 | 902 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 903 | |
4cd24eaf | 904 | mac_data->entries = mc_count; |
567ec874 | 905 | i = 0; |
22bedad3 JP |
906 | netdev_for_each_mc_addr(ha, dev) |
907 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
908 | |
909 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 910 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
911 | |
912 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
913 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
914 | sg, 2, 0)) | |
915 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
916 | ||
917 | kfree(buf); | |
2af7698e AW |
918 | } |
919 | ||
8e586137 | 920 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
921 | { |
922 | struct virtnet_info *vi = netdev_priv(dev); | |
923 | struct scatterlist sg; | |
924 | ||
23e258e1 | 925 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
926 | |
927 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
928 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
929 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
8e586137 | 930 | return 0; |
0bde9569 AW |
931 | } |
932 | ||
8e586137 | 933 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
934 | { |
935 | struct virtnet_info *vi = netdev_priv(dev); | |
936 | struct scatterlist sg; | |
937 | ||
23e258e1 | 938 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
939 | |
940 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
941 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
942 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
8e586137 | 943 | return 0; |
0bde9569 AW |
944 | } |
945 | ||
8f9f4668 RJ |
946 | static void virtnet_get_ringparam(struct net_device *dev, |
947 | struct ethtool_ringparam *ring) | |
948 | { | |
949 | struct virtnet_info *vi = netdev_priv(dev); | |
950 | ||
e9d7417b JW |
951 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq.vq); |
952 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq.vq); | |
8f9f4668 RJ |
953 | ring->rx_pending = ring->rx_max_pending; |
954 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
955 | } |
956 | ||
66846048 RJ |
957 | |
958 | static void virtnet_get_drvinfo(struct net_device *dev, | |
959 | struct ethtool_drvinfo *info) | |
960 | { | |
961 | struct virtnet_info *vi = netdev_priv(dev); | |
962 | struct virtio_device *vdev = vi->vdev; | |
963 | ||
964 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
965 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
966 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
967 | ||
968 | } | |
969 | ||
0fc0b732 | 970 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 971 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 972 | .get_link = ethtool_op_get_link, |
8f9f4668 | 973 | .get_ringparam = virtnet_get_ringparam, |
a9ea3fc6 HX |
974 | }; |
975 | ||
39da5814 MM |
976 | #define MIN_MTU 68 |
977 | #define MAX_MTU 65535 | |
978 | ||
979 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
980 | { | |
981 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
982 | return -EINVAL; | |
983 | dev->mtu = new_mtu; | |
984 | return 0; | |
985 | } | |
986 | ||
76288b4e SH |
987 | static const struct net_device_ops virtnet_netdev = { |
988 | .ndo_open = virtnet_open, | |
989 | .ndo_stop = virtnet_close, | |
990 | .ndo_start_xmit = start_xmit, | |
991 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 992 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 993 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 994 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 995 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
996 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
997 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
998 | #ifdef CONFIG_NET_POLL_CONTROLLER |
999 | .ndo_poll_controller = virtnet_netpoll, | |
1000 | #endif | |
1001 | }; | |
1002 | ||
586d17c5 | 1003 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1004 | { |
586d17c5 JW |
1005 | struct virtnet_info *vi = |
1006 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1007 | u16 v; |
1008 | ||
586d17c5 JW |
1009 | mutex_lock(&vi->config_lock); |
1010 | if (!vi->config_enable) | |
1011 | goto done; | |
1012 | ||
77dd7693 | 1013 | if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, |
9f4d26d0 | 1014 | offsetof(struct virtio_net_config, status), |
77dd7693 | 1015 | &v) < 0) |
586d17c5 JW |
1016 | goto done; |
1017 | ||
1018 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1019 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1020 | virtnet_ack_link_announce(vi); |
1021 | } | |
9f4d26d0 MM |
1022 | |
1023 | /* Ignore unknown (future) status bits */ | |
1024 | v &= VIRTIO_NET_S_LINK_UP; | |
1025 | ||
1026 | if (vi->status == v) | |
586d17c5 | 1027 | goto done; |
9f4d26d0 MM |
1028 | |
1029 | vi->status = v; | |
1030 | ||
1031 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1032 | netif_carrier_on(vi->dev); | |
1033 | netif_wake_queue(vi->dev); | |
1034 | } else { | |
1035 | netif_carrier_off(vi->dev); | |
1036 | netif_stop_queue(vi->dev); | |
1037 | } | |
586d17c5 JW |
1038 | done: |
1039 | mutex_unlock(&vi->config_lock); | |
9f4d26d0 MM |
1040 | } |
1041 | ||
1042 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1043 | { | |
1044 | struct virtnet_info *vi = vdev->priv; | |
1045 | ||
3b07e9ca | 1046 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1047 | } |
1048 | ||
e9d7417b JW |
1049 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1050 | { | |
1051 | struct virtio_device *vdev = vi->vdev; | |
1052 | ||
1053 | vdev->config->del_vqs(vdev); | |
1054 | } | |
1055 | ||
3f9c10b0 AS |
1056 | static int init_vqs(struct virtnet_info *vi) |
1057 | { | |
1058 | struct virtqueue *vqs[3]; | |
1059 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; | |
1060 | const char *names[] = { "input", "output", "control" }; | |
1061 | int nvqs, err; | |
1062 | ||
1063 | /* We expect two virtqueues, receive then send, | |
1064 | * and optionally control. */ | |
1065 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; | |
1066 | ||
1067 | err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names); | |
1068 | if (err) | |
1069 | return err; | |
1070 | ||
e9d7417b JW |
1071 | vi->rq.vq = vqs[0]; |
1072 | vi->sq.vq = vqs[1]; | |
3f9c10b0 AS |
1073 | |
1074 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { | |
1075 | vi->cvq = vqs[2]; | |
1076 | ||
1077 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) | |
1078 | vi->dev->features |= NETIF_F_HW_VLAN_FILTER; | |
1079 | } | |
1080 | return 0; | |
1081 | } | |
1082 | ||
296f96fc RR |
1083 | static int virtnet_probe(struct virtio_device *vdev) |
1084 | { | |
1085 | int err; | |
296f96fc RR |
1086 | struct net_device *dev; |
1087 | struct virtnet_info *vi; | |
296f96fc RR |
1088 | |
1089 | /* Allocate ourselves a network device with room for our info */ | |
1090 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
1091 | if (!dev) | |
1092 | return -ENOMEM; | |
1093 | ||
1094 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1095 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1096 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1097 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1098 | |
a9ea3fc6 | 1099 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1100 | SET_NETDEV_DEV(dev, &vdev->dev); |
1101 | ||
1102 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1103 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1104 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1105 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1106 | if (csum) | |
1107 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1108 | ||
1109 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1110 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1111 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1112 | } | |
5539ae96 | 1113 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1114 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1115 | dev->hw_features |= NETIF_F_TSO; | |
1116 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1117 | dev->hw_features |= NETIF_F_TSO6; | |
1118 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1119 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1120 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1121 | dev->hw_features |= NETIF_F_UFO; | |
1122 | ||
1123 | if (gso) | |
1124 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1125 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
1126 | } |
1127 | ||
1128 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
77dd7693 | 1129 | if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, |
a586d4f6 | 1130 | offsetof(struct virtio_net_config, mac), |
77dd7693 | 1131 | dev->dev_addr, dev->addr_len) < 0) |
f2cedb63 | 1132 | eth_hw_addr_random(dev); |
296f96fc RR |
1133 | |
1134 | /* Set up our device-specific information */ | |
1135 | vi = netdev_priv(dev); | |
e9d7417b | 1136 | netif_napi_add(dev, &vi->rq.napi, virtnet_poll, napi_weight); |
296f96fc RR |
1137 | vi->dev = dev; |
1138 | vi->vdev = vdev; | |
d9d5dcc8 | 1139 | vdev->priv = vi; |
e9d7417b | 1140 | vi->rq.pages = NULL; |
3fa2a1df | 1141 | vi->stats = alloc_percpu(struct virtnet_stats); |
1142 | err = -ENOMEM; | |
1143 | if (vi->stats == NULL) | |
1144 | goto free; | |
1145 | ||
3161e453 | 1146 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
586d17c5 JW |
1147 | mutex_init(&vi->config_lock); |
1148 | vi->config_enable = true; | |
1149 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); | |
e9d7417b JW |
1150 | sg_init_table(vi->rq.sg, ARRAY_SIZE(vi->rq.sg)); |
1151 | sg_init_table(vi->sq.sg, ARRAY_SIZE(vi->sq.sg)); | |
296f96fc | 1152 | |
97402b96 | 1153 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1154 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1155 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1156 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1157 | vi->big_packets = true; |
1158 | ||
3f2c31d9 MM |
1159 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1160 | vi->mergeable_rx_bufs = true; | |
1161 | ||
3f9c10b0 | 1162 | err = init_vqs(vi); |
d2a7ddda | 1163 | if (err) |
3fa2a1df | 1164 | goto free_stats; |
296f96fc | 1165 | |
296f96fc RR |
1166 | err = register_netdev(dev); |
1167 | if (err) { | |
1168 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1169 | goto free_vqs; |
296f96fc | 1170 | } |
b3369c1f RR |
1171 | |
1172 | /* Last of all, set up some receive buffers. */ | |
e9d7417b | 1173 | try_fill_recv(&vi->rq, GFP_KERNEL); |
b3369c1f RR |
1174 | |
1175 | /* If we didn't even get one input buffer, we're useless. */ | |
e9d7417b | 1176 | if (vi->rq.num == 0) { |
b3369c1f RR |
1177 | err = -ENOMEM; |
1178 | goto unregister; | |
1179 | } | |
1180 | ||
167c25e4 JW |
1181 | /* Assume link up if device can't report link status, |
1182 | otherwise get link status from config. */ | |
1183 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1184 | netif_carrier_off(dev); | |
3b07e9ca | 1185 | schedule_work(&vi->config_work); |
167c25e4 JW |
1186 | } else { |
1187 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1188 | netif_carrier_on(dev); | |
1189 | } | |
9f4d26d0 | 1190 | |
296f96fc | 1191 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
1192 | return 0; |
1193 | ||
b3369c1f RR |
1194 | unregister: |
1195 | unregister_netdev(dev); | |
d2a7ddda | 1196 | free_vqs: |
e9d7417b | 1197 | virtnet_del_vqs(vi); |
3fa2a1df | 1198 | free_stats: |
1199 | free_percpu(vi->stats); | |
296f96fc RR |
1200 | free: |
1201 | free_netdev(dev); | |
1202 | return err; | |
1203 | } | |
1204 | ||
9ab86bbc SM |
1205 | static void free_unused_bufs(struct virtnet_info *vi) |
1206 | { | |
1207 | void *buf; | |
830a8a97 | 1208 | while (1) { |
e9d7417b | 1209 | buf = virtqueue_detach_unused_buf(vi->sq.vq); |
830a8a97 SM |
1210 | if (!buf) |
1211 | break; | |
1212 | dev_kfree_skb(buf); | |
1213 | } | |
9ab86bbc | 1214 | while (1) { |
e9d7417b | 1215 | buf = virtqueue_detach_unused_buf(vi->rq.vq); |
9ab86bbc SM |
1216 | if (!buf) |
1217 | break; | |
1218 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
e9d7417b | 1219 | give_pages(&vi->rq, buf); |
9ab86bbc SM |
1220 | else |
1221 | dev_kfree_skb(buf); | |
e9d7417b | 1222 | --vi->rq.num; |
9ab86bbc | 1223 | } |
e9d7417b | 1224 | BUG_ON(vi->rq.num != 0); |
9ab86bbc SM |
1225 | } |
1226 | ||
04486ed0 | 1227 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1228 | { |
04486ed0 | 1229 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1230 | |
1231 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1232 | free_unused_bufs(vi); |
fb6813f4 | 1233 | |
e9d7417b | 1234 | virtnet_del_vqs(vi); |
d2a7ddda | 1235 | |
e9d7417b JW |
1236 | while (vi->rq.pages) |
1237 | __free_pages(get_a_page(&vi->rq, GFP_KERNEL), 0); | |
04486ed0 AS |
1238 | } |
1239 | ||
8cc085d6 | 1240 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1241 | { |
1242 | struct virtnet_info *vi = vdev->priv; | |
1243 | ||
586d17c5 JW |
1244 | /* Prevent config work handler from accessing the device. */ |
1245 | mutex_lock(&vi->config_lock); | |
1246 | vi->config_enable = false; | |
1247 | mutex_unlock(&vi->config_lock); | |
1248 | ||
04486ed0 AS |
1249 | unregister_netdev(vi->dev); |
1250 | ||
1251 | remove_vq_common(vi); | |
fb6813f4 | 1252 | |
586d17c5 JW |
1253 | flush_work(&vi->config_work); |
1254 | ||
2e66f55b | 1255 | free_percpu(vi->stats); |
74b2553f | 1256 | free_netdev(vi->dev); |
296f96fc RR |
1257 | } |
1258 | ||
0741bcb5 AS |
1259 | #ifdef CONFIG_PM |
1260 | static int virtnet_freeze(struct virtio_device *vdev) | |
1261 | { | |
1262 | struct virtnet_info *vi = vdev->priv; | |
1263 | ||
586d17c5 JW |
1264 | /* Prevent config work handler from accessing the device */ |
1265 | mutex_lock(&vi->config_lock); | |
1266 | vi->config_enable = false; | |
1267 | mutex_unlock(&vi->config_lock); | |
1268 | ||
0741bcb5 AS |
1269 | netif_device_detach(vi->dev); |
1270 | cancel_delayed_work_sync(&vi->refill); | |
1271 | ||
1272 | if (netif_running(vi->dev)) | |
e9d7417b | 1273 | napi_disable(&vi->rq.napi); |
0741bcb5 AS |
1274 | |
1275 | remove_vq_common(vi); | |
1276 | ||
586d17c5 JW |
1277 | flush_work(&vi->config_work); |
1278 | ||
0741bcb5 AS |
1279 | return 0; |
1280 | } | |
1281 | ||
1282 | static int virtnet_restore(struct virtio_device *vdev) | |
1283 | { | |
1284 | struct virtnet_info *vi = vdev->priv; | |
1285 | int err; | |
1286 | ||
1287 | err = init_vqs(vi); | |
1288 | if (err) | |
1289 | return err; | |
1290 | ||
1291 | if (netif_running(vi->dev)) | |
e9d7417b | 1292 | virtnet_napi_enable(&vi->rq); |
0741bcb5 AS |
1293 | |
1294 | netif_device_attach(vi->dev); | |
1295 | ||
e9d7417b | 1296 | if (!try_fill_recv(&vi->rq, GFP_KERNEL)) |
3b07e9ca | 1297 | schedule_delayed_work(&vi->refill, 0); |
0741bcb5 | 1298 | |
586d17c5 JW |
1299 | mutex_lock(&vi->config_lock); |
1300 | vi->config_enable = true; | |
1301 | mutex_unlock(&vi->config_lock); | |
1302 | ||
0741bcb5 AS |
1303 | return 0; |
1304 | } | |
1305 | #endif | |
1306 | ||
296f96fc RR |
1307 | static struct virtio_device_id id_table[] = { |
1308 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1309 | { 0 }, | |
1310 | }; | |
1311 | ||
c45a6816 | 1312 | static unsigned int features[] = { |
5e4fe5c4 MM |
1313 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1314 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1315 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1316 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1317 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1318 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1319 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
586d17c5 | 1320 | VIRTIO_NET_F_GUEST_ANNOUNCE, |
c45a6816 RR |
1321 | }; |
1322 | ||
22402529 | 1323 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1324 | .feature_table = features, |
1325 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1326 | .driver.name = KBUILD_MODNAME, |
1327 | .driver.owner = THIS_MODULE, | |
1328 | .id_table = id_table, | |
1329 | .probe = virtnet_probe, | |
8cc085d6 | 1330 | .remove = virtnet_remove, |
9f4d26d0 | 1331 | .config_changed = virtnet_config_changed, |
0741bcb5 AS |
1332 | #ifdef CONFIG_PM |
1333 | .freeze = virtnet_freeze, | |
1334 | .restore = virtnet_restore, | |
1335 | #endif | |
296f96fc RR |
1336 | }; |
1337 | ||
1338 | static int __init init(void) | |
1339 | { | |
22402529 | 1340 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1341 | } |
1342 | ||
1343 | static void __exit fini(void) | |
1344 | { | |
22402529 | 1345 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1346 | } |
1347 | module_init(init); | |
1348 | module_exit(fini); | |
1349 | ||
1350 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1351 | MODULE_DESCRIPTION("Virtio network driver"); | |
1352 | MODULE_LICENSE("GPL"); |