Commit | Line | Data |
---|---|---|
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> |
296f96fc | 28 | |
6c0cd7c0 DL |
29 | static int napi_weight = 128; |
30 | module_param(napi_weight, int, 0444); | |
31 | ||
34a48579 RR |
32 | static int csum = 1, gso = 1; |
33 | module_param(csum, bool, 0444); | |
34 | module_param(gso, bool, 0444); | |
35 | ||
296f96fc | 36 | /* FIXME: MTU in config. */ |
e918085a | 37 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 38 | #define GOOD_COPY_LEN 128 |
296f96fc | 39 | |
f565a7c2 | 40 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
2a41f71d | 41 | |
296f96fc RR |
42 | struct virtnet_info |
43 | { | |
44 | struct virtio_device *vdev; | |
2a41f71d | 45 | struct virtqueue *rvq, *svq, *cvq; |
296f96fc RR |
46 | struct net_device *dev; |
47 | struct napi_struct napi; | |
9f4d26d0 | 48 | unsigned int status; |
296f96fc RR |
49 | |
50 | /* Number of input buffers, and max we've ever had. */ | |
51 | unsigned int num, max; | |
52 | ||
97402b96 HX |
53 | /* I like... big packets and I cannot lie! */ |
54 | bool big_packets; | |
55 | ||
3f2c31d9 MM |
56 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
57 | bool mergeable_rx_bufs; | |
58 | ||
3161e453 RR |
59 | /* Work struct for refilling if we run low on memory. */ |
60 | struct delayed_work refill; | |
61 | ||
fb6813f4 RR |
62 | /* Chain pages by the private ptr. */ |
63 | struct page *pages; | |
296f96fc RR |
64 | }; |
65 | ||
b3f24698 RR |
66 | struct skb_vnet_hdr { |
67 | union { | |
68 | struct virtio_net_hdr hdr; | |
69 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
70 | }; | |
48925e37 | 71 | unsigned int num_sg; |
b3f24698 RR |
72 | }; |
73 | ||
9ab86bbc SM |
74 | struct padded_vnet_hdr { |
75 | struct virtio_net_hdr hdr; | |
76 | /* | |
77 | * virtio_net_hdr should be in a separated sg buffer because of a | |
78 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
79 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
80 | */ | |
81 | char padding[6]; | |
82 | }; | |
83 | ||
b3f24698 | 84 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 85 | { |
b3f24698 | 86 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
87 | } |
88 | ||
9ab86bbc SM |
89 | /* |
90 | * private is used to chain pages for big packets, put the whole | |
91 | * most recent used list in the beginning for reuse | |
92 | */ | |
93 | static void give_pages(struct virtnet_info *vi, struct page *page) | |
0a888fd1 | 94 | { |
9ab86bbc | 95 | struct page *end; |
0a888fd1 | 96 | |
9ab86bbc SM |
97 | /* Find end of list, sew whole thing into vi->pages. */ |
98 | for (end = page; end->private; end = (struct page *)end->private); | |
99 | end->private = (unsigned long)vi->pages; | |
100 | vi->pages = page; | |
0a888fd1 MM |
101 | } |
102 | ||
fb6813f4 RR |
103 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
104 | { | |
105 | struct page *p = vi->pages; | |
106 | ||
9ab86bbc | 107 | if (p) { |
fb6813f4 | 108 | vi->pages = (struct page *)p->private; |
9ab86bbc SM |
109 | /* clear private here, it is used to chain pages */ |
110 | p->private = 0; | |
111 | } else | |
fb6813f4 RR |
112 | p = alloc_page(gfp_mask); |
113 | return p; | |
114 | } | |
115 | ||
2cb9c6ba | 116 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 117 | { |
2cb9c6ba | 118 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 119 | |
2cb9c6ba RR |
120 | /* Suppress further interrupts. */ |
121 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 122 | |
363f1514 | 123 | /* We were probably waiting for more output buffers. */ |
296f96fc | 124 | netif_wake_queue(vi->dev); |
296f96fc RR |
125 | } |
126 | ||
9ab86bbc SM |
127 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
128 | unsigned int offset, unsigned int *len) | |
296f96fc | 129 | { |
9ab86bbc SM |
130 | int i = skb_shinfo(skb)->nr_frags; |
131 | skb_frag_t *f; | |
132 | ||
133 | f = &skb_shinfo(skb)->frags[i]; | |
134 | f->size = min((unsigned)PAGE_SIZE - offset, *len); | |
135 | f->page_offset = offset; | |
136 | f->page = page; | |
137 | ||
138 | skb->data_len += f->size; | |
139 | skb->len += f->size; | |
140 | skb_shinfo(skb)->nr_frags++; | |
141 | *len -= f->size; | |
142 | } | |
23cde76d | 143 | |
9ab86bbc SM |
144 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
145 | struct page *page, unsigned int len) | |
146 | { | |
147 | struct sk_buff *skb; | |
148 | struct skb_vnet_hdr *hdr; | |
149 | unsigned int copy, hdr_len, offset; | |
150 | char *p; | |
fb6813f4 | 151 | |
9ab86bbc | 152 | p = page_address(page); |
3f2c31d9 | 153 | |
9ab86bbc SM |
154 | /* copy small packet so we can reuse these pages for small data */ |
155 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
156 | if (unlikely(!skb)) | |
157 | return NULL; | |
3f2c31d9 | 158 | |
9ab86bbc | 159 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 160 | |
9ab86bbc SM |
161 | if (vi->mergeable_rx_bufs) { |
162 | hdr_len = sizeof hdr->mhdr; | |
163 | offset = hdr_len; | |
164 | } else { | |
165 | hdr_len = sizeof hdr->hdr; | |
166 | offset = sizeof(struct padded_vnet_hdr); | |
167 | } | |
3f2c31d9 | 168 | |
9ab86bbc | 169 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 170 | |
9ab86bbc SM |
171 | len -= hdr_len; |
172 | p += offset; | |
3f2c31d9 | 173 | |
9ab86bbc SM |
174 | copy = len; |
175 | if (copy > skb_tailroom(skb)) | |
176 | copy = skb_tailroom(skb); | |
177 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 178 | |
9ab86bbc SM |
179 | len -= copy; |
180 | offset += copy; | |
3f2c31d9 | 181 | |
9ab86bbc SM |
182 | while (len) { |
183 | set_skb_frag(skb, page, offset, &len); | |
184 | page = (struct page *)page->private; | |
185 | offset = 0; | |
186 | } | |
3f2c31d9 | 187 | |
9ab86bbc SM |
188 | if (page) |
189 | give_pages(vi, page); | |
3f2c31d9 | 190 | |
9ab86bbc SM |
191 | return skb; |
192 | } | |
3f2c31d9 | 193 | |
9ab86bbc SM |
194 | static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) |
195 | { | |
196 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
197 | struct page *page; | |
198 | int num_buf, i, len; | |
199 | ||
200 | num_buf = hdr->mhdr.num_buffers; | |
201 | while (--num_buf) { | |
202 | i = skb_shinfo(skb)->nr_frags; | |
203 | if (i >= MAX_SKB_FRAGS) { | |
204 | pr_debug("%s: packet too long\n", skb->dev->name); | |
205 | skb->dev->stats.rx_length_errors++; | |
206 | return -EINVAL; | |
207 | } | |
3f2c31d9 | 208 | |
9ab86bbc SM |
209 | page = vi->rvq->vq_ops->get_buf(vi->rvq, &len); |
210 | if (!page) { | |
211 | pr_debug("%s: rx error: %d buffers missing\n", | |
212 | skb->dev->name, hdr->mhdr.num_buffers); | |
213 | skb->dev->stats.rx_length_errors++; | |
214 | return -EINVAL; | |
3f2c31d9 | 215 | } |
9ab86bbc SM |
216 | if (len > PAGE_SIZE) |
217 | len = PAGE_SIZE; | |
218 | ||
219 | set_skb_frag(skb, page, 0, &len); | |
220 | ||
221 | --vi->num; | |
222 | } | |
223 | return 0; | |
224 | } | |
225 | ||
226 | static void receive_buf(struct net_device *dev, void *buf, unsigned int len) | |
227 | { | |
228 | struct virtnet_info *vi = netdev_priv(dev); | |
229 | struct sk_buff *skb; | |
230 | struct page *page; | |
231 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 232 | |
9ab86bbc SM |
233 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
234 | pr_debug("%s: short packet %i\n", dev->name, len); | |
235 | dev->stats.rx_length_errors++; | |
236 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
237 | give_pages(vi, buf); | |
238 | else | |
239 | dev_kfree_skb(buf); | |
240 | return; | |
241 | } | |
3f2c31d9 | 242 | |
9ab86bbc SM |
243 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
244 | skb = buf; | |
245 | len -= sizeof(struct virtio_net_hdr); | |
246 | skb_trim(skb, len); | |
247 | } else { | |
248 | page = buf; | |
249 | skb = page_to_skb(vi, page, len); | |
250 | if (unlikely(!skb)) { | |
3f2c31d9 | 251 | dev->stats.rx_dropped++; |
9ab86bbc SM |
252 | give_pages(vi, page); |
253 | return; | |
3f2c31d9 | 254 | } |
9ab86bbc SM |
255 | if (vi->mergeable_rx_bufs) |
256 | if (receive_mergeable(vi, skb)) { | |
257 | dev_kfree_skb(skb); | |
258 | return; | |
259 | } | |
97402b96 | 260 | } |
3f2c31d9 | 261 | |
9ab86bbc | 262 | hdr = skb_vnet_hdr(skb); |
97402b96 | 263 | skb->truesize += skb->data_len; |
296f96fc RR |
264 | dev->stats.rx_bytes += skb->len; |
265 | dev->stats.rx_packets++; | |
266 | ||
b3f24698 | 267 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 268 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
269 | if (!skb_partial_csum_set(skb, |
270 | hdr->hdr.csum_start, | |
271 | hdr->hdr.csum_offset)) | |
296f96fc | 272 | goto frame_err; |
296f96fc RR |
273 | } |
274 | ||
23cde76d MM |
275 | skb->protocol = eth_type_trans(skb, dev); |
276 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
277 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
278 | ||
b3f24698 | 279 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 280 | pr_debug("GSO!\n"); |
b3f24698 | 281 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
282 | case VIRTIO_NET_HDR_GSO_TCPV4: |
283 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
284 | break; | |
296f96fc RR |
285 | case VIRTIO_NET_HDR_GSO_UDP: |
286 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
287 | break; | |
288 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
289 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
290 | break; | |
291 | default: | |
292 | if (net_ratelimit()) | |
293 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
b3f24698 | 294 | dev->name, hdr->hdr.gso_type); |
296f96fc RR |
295 | goto frame_err; |
296 | } | |
297 | ||
b3f24698 | 298 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
299 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
300 | ||
b3f24698 | 301 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc RR |
302 | if (skb_shinfo(skb)->gso_size == 0) { |
303 | if (net_ratelimit()) | |
304 | printk(KERN_WARNING "%s: zero gso size.\n", | |
305 | dev->name); | |
306 | goto frame_err; | |
307 | } | |
308 | ||
309 | /* Header must be checked, and gso_segs computed. */ | |
310 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
311 | skb_shinfo(skb)->gso_segs = 0; | |
312 | } | |
313 | ||
314 | netif_receive_skb(skb); | |
315 | return; | |
316 | ||
317 | frame_err: | |
318 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
319 | dev_kfree_skb(skb); |
320 | } | |
321 | ||
9ab86bbc | 322 | static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) |
296f96fc RR |
323 | { |
324 | struct sk_buff *skb; | |
9ab86bbc SM |
325 | struct skb_vnet_hdr *hdr; |
326 | struct scatterlist sg[2]; | |
327 | int err; | |
3f2c31d9 | 328 | |
2c45cd43 | 329 | sg_init_table(sg, 2); |
9ab86bbc SM |
330 | skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN); |
331 | if (unlikely(!skb)) | |
332 | return -ENOMEM; | |
296f96fc | 333 | |
9ab86bbc | 334 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 335 | |
9ab86bbc SM |
336 | hdr = skb_vnet_hdr(skb); |
337 | sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr); | |
97402b96 | 338 | |
9ab86bbc | 339 | skb_to_sgvec(skb, sg + 1, 0, skb->len); |
97402b96 | 340 | |
9ab86bbc SM |
341 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 2, skb); |
342 | if (err < 0) | |
343 | dev_kfree_skb(skb); | |
97402b96 | 344 | |
9ab86bbc SM |
345 | return err; |
346 | } | |
97402b96 | 347 | |
9ab86bbc SM |
348 | static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) |
349 | { | |
350 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
351 | struct page *first, *list = NULL; | |
352 | char *p; | |
353 | int i, err, offset; | |
354 | ||
2c45cd43 | 355 | sg_init_table(sg, MAX_SKB_FRAGS + 2); |
9ab86bbc SM |
356 | /* page in sg[MAX_SKB_FRAGS + 1] is list tail */ |
357 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { | |
358 | first = get_a_page(vi, gfp); | |
359 | if (!first) { | |
360 | if (list) | |
361 | give_pages(vi, list); | |
362 | return -ENOMEM; | |
97402b96 | 363 | } |
9ab86bbc | 364 | sg_set_buf(&sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 365 | |
9ab86bbc SM |
366 | /* chain new page in list head to match sg */ |
367 | first->private = (unsigned long)list; | |
368 | list = first; | |
369 | } | |
296f96fc | 370 | |
9ab86bbc SM |
371 | first = get_a_page(vi, gfp); |
372 | if (!first) { | |
373 | give_pages(vi, list); | |
374 | return -ENOMEM; | |
375 | } | |
376 | p = page_address(first); | |
377 | ||
378 | /* sg[0], sg[1] share the same page */ | |
379 | /* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/ | |
380 | sg_set_buf(&sg[0], p, sizeof(struct virtio_net_hdr)); | |
381 | ||
382 | /* sg[1] for data packet, from offset */ | |
383 | offset = sizeof(struct padded_vnet_hdr); | |
384 | sg_set_buf(&sg[1], p + offset, PAGE_SIZE - offset); | |
385 | ||
386 | /* chain first in list head */ | |
387 | first->private = (unsigned long)list; | |
388 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, MAX_SKB_FRAGS + 2, | |
389 | first); | |
390 | if (err < 0) | |
391 | give_pages(vi, first); | |
392 | ||
393 | return err; | |
296f96fc RR |
394 | } |
395 | ||
9ab86bbc | 396 | static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) |
3f2c31d9 | 397 | { |
9ab86bbc SM |
398 | struct page *page; |
399 | struct scatterlist sg; | |
3f2c31d9 | 400 | int err; |
3f2c31d9 | 401 | |
9ab86bbc SM |
402 | page = get_a_page(vi, gfp); |
403 | if (!page) | |
404 | return -ENOMEM; | |
3f2c31d9 | 405 | |
9ab86bbc | 406 | sg_init_one(&sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 407 | |
9ab86bbc SM |
408 | err = vi->rvq->vq_ops->add_buf(vi->rvq, &sg, 0, 1, page); |
409 | if (err < 0) | |
410 | give_pages(vi, page); | |
3f2c31d9 | 411 | |
9ab86bbc SM |
412 | return err; |
413 | } | |
3f2c31d9 | 414 | |
9ab86bbc SM |
415 | /* Returns false if we couldn't fill entirely (OOM). */ |
416 | static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) | |
417 | { | |
418 | int err; | |
419 | bool oom = false; | |
3f2c31d9 | 420 | |
9ab86bbc SM |
421 | do { |
422 | if (vi->mergeable_rx_bufs) | |
423 | err = add_recvbuf_mergeable(vi, gfp); | |
424 | else if (vi->big_packets) | |
425 | err = add_recvbuf_big(vi, gfp); | |
426 | else | |
427 | err = add_recvbuf_small(vi, gfp); | |
3f2c31d9 | 428 | |
3c1b27d5 | 429 | if (err < 0) { |
9ab86bbc | 430 | oom = true; |
3f2c31d9 MM |
431 | break; |
432 | } | |
9ab86bbc | 433 | ++vi->num; |
0aea51c3 | 434 | } while (err > 0); |
3f2c31d9 MM |
435 | if (unlikely(vi->num > vi->max)) |
436 | vi->max = vi->num; | |
437 | vi->rvq->vq_ops->kick(vi->rvq); | |
3161e453 | 438 | return !oom; |
3f2c31d9 MM |
439 | } |
440 | ||
18445c4d | 441 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
442 | { |
443 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d | 444 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
288379f0 | 445 | if (napi_schedule_prep(&vi->napi)) { |
18445c4d | 446 | rvq->vq_ops->disable_cb(rvq); |
288379f0 | 447 | __napi_schedule(&vi->napi); |
18445c4d | 448 | } |
296f96fc RR |
449 | } |
450 | ||
3161e453 RR |
451 | static void refill_work(struct work_struct *work) |
452 | { | |
453 | struct virtnet_info *vi; | |
454 | bool still_empty; | |
455 | ||
456 | vi = container_of(work, struct virtnet_info, refill.work); | |
457 | napi_disable(&vi->napi); | |
39d32157 | 458 | still_empty = !try_fill_recv(vi, GFP_KERNEL); |
3161e453 RR |
459 | napi_enable(&vi->napi); |
460 | ||
461 | /* In theory, this can happen: if we don't get any buffers in | |
462 | * we will *never* try to fill again. */ | |
463 | if (still_empty) | |
464 | schedule_delayed_work(&vi->refill, HZ/2); | |
465 | } | |
466 | ||
296f96fc RR |
467 | static int virtnet_poll(struct napi_struct *napi, int budget) |
468 | { | |
469 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
9ab86bbc | 470 | void *buf; |
296f96fc RR |
471 | unsigned int len, received = 0; |
472 | ||
473 | again: | |
474 | while (received < budget && | |
9ab86bbc SM |
475 | (buf = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { |
476 | receive_buf(vi->dev, buf, len); | |
477 | --vi->num; | |
296f96fc RR |
478 | received++; |
479 | } | |
480 | ||
3161e453 RR |
481 | if (vi->num < vi->max / 2) { |
482 | if (!try_fill_recv(vi, GFP_ATOMIC)) | |
483 | schedule_delayed_work(&vi->refill, 0); | |
484 | } | |
296f96fc | 485 | |
8329d98e RR |
486 | /* Out of packets? */ |
487 | if (received < budget) { | |
288379f0 | 488 | napi_complete(napi); |
8e95a202 JP |
489 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) && |
490 | napi_schedule_prep(napi)) { | |
4265f161 | 491 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
288379f0 | 492 | __napi_schedule(napi); |
296f96fc | 493 | goto again; |
4265f161 | 494 | } |
296f96fc RR |
495 | } |
496 | ||
497 | return received; | |
498 | } | |
499 | ||
48925e37 | 500 | static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) |
296f96fc RR |
501 | { |
502 | struct sk_buff *skb; | |
48925e37 | 503 | unsigned int len, tot_sgs = 0; |
296f96fc RR |
504 | |
505 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
506 | pr_debug("Sent skb %p\n", skb); | |
655aa31f | 507 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc | 508 | vi->dev->stats.tx_packets++; |
48925e37 | 509 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
ed79bab8 | 510 | dev_kfree_skb_any(skb); |
296f96fc | 511 | } |
48925e37 | 512 | return tot_sgs; |
296f96fc RR |
513 | } |
514 | ||
99ffc696 | 515 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 516 | { |
05271685 | 517 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
b3f24698 | 518 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 519 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
296f96fc | 520 | |
05271685 | 521 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 522 | |
e174961c | 523 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 524 | |
296f96fc | 525 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 RR |
526 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
527 | hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb); | |
528 | hdr->hdr.csum_offset = skb->csum_offset; | |
296f96fc | 529 | } else { |
b3f24698 RR |
530 | hdr->hdr.flags = 0; |
531 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
532 | } |
533 | ||
534 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
535 | hdr->hdr.hdr_len = skb_headlen(skb); |
536 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 537 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 538 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 539 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 540 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 541 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 542 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
543 | else |
544 | BUG(); | |
34a48579 | 545 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 546 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 547 | } else { |
b3f24698 RR |
548 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
549 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
550 | } |
551 | ||
b3f24698 | 552 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
553 | |
554 | /* Encode metadata header at front. */ | |
555 | if (vi->mergeable_rx_bufs) | |
9ab86bbc | 556 | sg_set_buf(sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 557 | else |
9ab86bbc | 558 | sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 559 | |
48925e37 RR |
560 | hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
561 | return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb); | |
11a3a154 RR |
562 | } |
563 | ||
424efe9c | 564 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
565 | { |
566 | struct virtnet_info *vi = netdev_priv(dev); | |
48925e37 | 567 | int capacity; |
2cb9c6ba RR |
568 | |
569 | again: | |
570 | /* Free up any pending old buffers before queueing new ones. */ | |
571 | free_old_xmit_skbs(vi); | |
99ffc696 | 572 | |
03f191ba | 573 | /* Try to transmit */ |
48925e37 RR |
574 | capacity = xmit_skb(vi, skb); |
575 | ||
576 | /* This can happen with OOM and indirect buffers. */ | |
577 | if (unlikely(capacity < 0)) { | |
578 | netif_stop_queue(dev); | |
579 | dev_warn(&dev->dev, "Unexpected full queue\n"); | |
580 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
581 | vi->svq->vq_ops->disable_cb(vi->svq); | |
582 | netif_start_queue(dev); | |
583 | goto again; | |
584 | } | |
585 | return NETDEV_TX_BUSY; | |
296f96fc | 586 | } |
48925e37 | 587 | vi->svq->vq_ops->kick(vi->svq); |
03f191ba | 588 | |
48925e37 RR |
589 | /* Don't wait up for transmitted skbs to be freed. */ |
590 | skb_orphan(skb); | |
591 | nf_reset(skb); | |
592 | ||
593 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
594 | * before it gets out of hand. Naturally, this wastes entries. */ | |
595 | if (capacity < 2+MAX_SKB_FRAGS) { | |
596 | netif_stop_queue(dev); | |
597 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
598 | /* More just got used, free them then recheck. */ | |
599 | capacity += free_old_xmit_skbs(vi); | |
600 | if (capacity >= 2+MAX_SKB_FRAGS) { | |
601 | netif_start_queue(dev); | |
602 | vi->svq->vq_ops->disable_cb(vi->svq); | |
603 | } | |
604 | } | |
99ffc696 | 605 | } |
48925e37 RR |
606 | |
607 | return NETDEV_TX_OK; | |
296f96fc RR |
608 | } |
609 | ||
9c46f6d4 AW |
610 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
611 | { | |
612 | struct virtnet_info *vi = netdev_priv(dev); | |
613 | struct virtio_device *vdev = vi->vdev; | |
614 | int ret; | |
615 | ||
616 | ret = eth_mac_addr(dev, p); | |
617 | if (ret) | |
618 | return ret; | |
619 | ||
62994b2d AW |
620 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
621 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
622 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
623 | |
624 | return 0; | |
625 | } | |
626 | ||
da74e89d AS |
627 | #ifdef CONFIG_NET_POLL_CONTROLLER |
628 | static void virtnet_netpoll(struct net_device *dev) | |
629 | { | |
630 | struct virtnet_info *vi = netdev_priv(dev); | |
631 | ||
632 | napi_schedule(&vi->napi); | |
633 | } | |
634 | #endif | |
635 | ||
296f96fc RR |
636 | static int virtnet_open(struct net_device *dev) |
637 | { | |
638 | struct virtnet_info *vi = netdev_priv(dev); | |
639 | ||
296f96fc | 640 | napi_enable(&vi->napi); |
a48bd8f6 RR |
641 | |
642 | /* If all buffers were filled by other side before we napi_enabled, we | |
643 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
644 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
645 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
288379f0 | 646 | if (napi_schedule_prep(&vi->napi)) { |
370076d9 | 647 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
288379f0 | 648 | __napi_schedule(&vi->napi); |
370076d9 | 649 | } |
296f96fc RR |
650 | return 0; |
651 | } | |
652 | ||
2a41f71d AW |
653 | /* |
654 | * Send command via the control virtqueue and check status. Commands | |
655 | * supported by the hypervisor, as indicated by feature bits, should | |
656 | * never fail unless improperly formated. | |
657 | */ | |
658 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
659 | struct scatterlist *data, int out, int in) | |
660 | { | |
23e258e1 | 661 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
662 | struct virtio_net_ctrl_hdr ctrl; |
663 | virtio_net_ctrl_ack status = ~0; | |
664 | unsigned int tmp; | |
23e258e1 | 665 | int i; |
2a41f71d | 666 | |
0ee904c3 AB |
667 | /* Caller should know better */ |
668 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
669 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
670 | |
671 | out++; /* Add header */ | |
672 | in++; /* Add return status */ | |
673 | ||
674 | ctrl.class = class; | |
675 | ctrl.cmd = cmd; | |
676 | ||
677 | sg_init_table(sg, out + in); | |
678 | ||
679 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
680 | for_each_sg(data, s, out + in - 2, i) |
681 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
682 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
683 | ||
3c1b27d5 | 684 | BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0); |
2a41f71d AW |
685 | |
686 | vi->cvq->vq_ops->kick(vi->cvq); | |
687 | ||
688 | /* | |
689 | * Spin for a response, the kick causes an ioport write, trapping | |
690 | * into the hypervisor, so the request should be handled immediately. | |
691 | */ | |
692 | while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp)) | |
693 | cpu_relax(); | |
694 | ||
695 | return status == VIRTIO_NET_OK; | |
696 | } | |
697 | ||
296f96fc RR |
698 | static int virtnet_close(struct net_device *dev) |
699 | { | |
700 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
701 | |
702 | napi_disable(&vi->napi); | |
703 | ||
296f96fc RR |
704 | return 0; |
705 | } | |
706 | ||
a9ea3fc6 HX |
707 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
708 | { | |
709 | struct virtnet_info *vi = netdev_priv(dev); | |
710 | struct virtio_device *vdev = vi->vdev; | |
711 | ||
712 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) | |
713 | return -ENOSYS; | |
714 | ||
715 | return ethtool_op_set_tx_hw_csum(dev, data); | |
716 | } | |
717 | ||
2af7698e AW |
718 | static void virtnet_set_rx_mode(struct net_device *dev) |
719 | { | |
720 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 721 | struct scatterlist sg[2]; |
2af7698e | 722 | u8 promisc, allmulti; |
f565a7c2 | 723 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 724 | struct netdev_hw_addr *ha; |
32e7bfc4 | 725 | int uc_count; |
4cd24eaf | 726 | int mc_count; |
f565a7c2 AW |
727 | void *buf; |
728 | int i; | |
2af7698e AW |
729 | |
730 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
731 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
732 | return; | |
733 | ||
f565a7c2 AW |
734 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
735 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 736 | |
23e258e1 | 737 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
738 | |
739 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
740 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 741 | sg, 1, 0)) |
2af7698e AW |
742 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
743 | promisc ? "en" : "dis"); | |
744 | ||
23e258e1 | 745 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
746 | |
747 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
748 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 749 | sg, 1, 0)) |
2af7698e AW |
750 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
751 | allmulti ? "en" : "dis"); | |
f565a7c2 | 752 | |
32e7bfc4 | 753 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 754 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 755 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
756 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
757 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
758 | mac_data = buf; | |
f565a7c2 AW |
759 | if (!buf) { |
760 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
761 | return; | |
762 | } | |
763 | ||
23e258e1 AW |
764 | sg_init_table(sg, 2); |
765 | ||
f565a7c2 | 766 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 767 | mac_data->entries = uc_count; |
ccffad25 | 768 | i = 0; |
32e7bfc4 | 769 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 770 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
771 | |
772 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 773 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
774 | |
775 | /* multicast list and count fill the end */ | |
32e7bfc4 | 776 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 777 | |
4cd24eaf | 778 | mac_data->entries = mc_count; |
567ec874 | 779 | i = 0; |
22bedad3 JP |
780 | netdev_for_each_mc_addr(ha, dev) |
781 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
782 | |
783 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 784 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
785 | |
786 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
787 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
788 | sg, 2, 0)) | |
789 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
790 | ||
791 | kfree(buf); | |
2af7698e AW |
792 | } |
793 | ||
1824a989 | 794 | static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
795 | { |
796 | struct virtnet_info *vi = netdev_priv(dev); | |
797 | struct scatterlist sg; | |
798 | ||
23e258e1 | 799 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
800 | |
801 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
802 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
803 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
804 | } | |
805 | ||
1824a989 | 806 | static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
807 | { |
808 | struct virtnet_info *vi = netdev_priv(dev); | |
809 | struct scatterlist sg; | |
810 | ||
23e258e1 | 811 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
812 | |
813 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
814 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
815 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
816 | } | |
817 | ||
0fc0b732 | 818 | static const struct ethtool_ops virtnet_ethtool_ops = { |
a9ea3fc6 HX |
819 | .set_tx_csum = virtnet_set_tx_csum, |
820 | .set_sg = ethtool_op_set_sg, | |
0276b497 | 821 | .set_tso = ethtool_op_set_tso, |
5c516751 | 822 | .set_ufo = ethtool_op_set_ufo, |
9f4d26d0 | 823 | .get_link = ethtool_op_get_link, |
a9ea3fc6 HX |
824 | }; |
825 | ||
39da5814 MM |
826 | #define MIN_MTU 68 |
827 | #define MAX_MTU 65535 | |
828 | ||
829 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
830 | { | |
831 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
832 | return -EINVAL; | |
833 | dev->mtu = new_mtu; | |
834 | return 0; | |
835 | } | |
836 | ||
76288b4e SH |
837 | static const struct net_device_ops virtnet_netdev = { |
838 | .ndo_open = virtnet_open, | |
839 | .ndo_stop = virtnet_close, | |
840 | .ndo_start_xmit = start_xmit, | |
841 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 842 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 843 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 844 | .ndo_change_mtu = virtnet_change_mtu, |
1824a989 AW |
845 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
846 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
847 | #ifdef CONFIG_NET_POLL_CONTROLLER |
848 | .ndo_poll_controller = virtnet_netpoll, | |
849 | #endif | |
850 | }; | |
851 | ||
9f4d26d0 MM |
852 | static void virtnet_update_status(struct virtnet_info *vi) |
853 | { | |
854 | u16 v; | |
855 | ||
856 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) | |
857 | return; | |
858 | ||
859 | vi->vdev->config->get(vi->vdev, | |
860 | offsetof(struct virtio_net_config, status), | |
861 | &v, sizeof(v)); | |
862 | ||
863 | /* Ignore unknown (future) status bits */ | |
864 | v &= VIRTIO_NET_S_LINK_UP; | |
865 | ||
866 | if (vi->status == v) | |
867 | return; | |
868 | ||
869 | vi->status = v; | |
870 | ||
871 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
872 | netif_carrier_on(vi->dev); | |
873 | netif_wake_queue(vi->dev); | |
874 | } else { | |
875 | netif_carrier_off(vi->dev); | |
876 | netif_stop_queue(vi->dev); | |
877 | } | |
878 | } | |
879 | ||
880 | static void virtnet_config_changed(struct virtio_device *vdev) | |
881 | { | |
882 | struct virtnet_info *vi = vdev->priv; | |
883 | ||
884 | virtnet_update_status(vi); | |
885 | } | |
886 | ||
296f96fc RR |
887 | static int virtnet_probe(struct virtio_device *vdev) |
888 | { | |
889 | int err; | |
296f96fc RR |
890 | struct net_device *dev; |
891 | struct virtnet_info *vi; | |
d2a7ddda MT |
892 | struct virtqueue *vqs[3]; |
893 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; | |
894 | const char *names[] = { "input", "output", "control" }; | |
895 | int nvqs; | |
296f96fc RR |
896 | |
897 | /* Allocate ourselves a network device with room for our info */ | |
898 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
899 | if (!dev) | |
900 | return -ENOMEM; | |
901 | ||
902 | /* Set up network device as normal. */ | |
76288b4e | 903 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 904 | dev->features = NETIF_F_HIGHDMA; |
a9ea3fc6 | 905 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
906 | SET_NETDEV_DEV(dev, &vdev->dev); |
907 | ||
908 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 909 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
910 | /* This opens up the world of extra features. */ |
911 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 912 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
913 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
914 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
915 | } | |
5539ae96 | 916 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 917 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 918 | dev->features |= NETIF_F_TSO; |
c45a6816 | 919 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 920 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 921 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 922 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 923 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 924 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
925 | } |
926 | ||
927 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 928 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
929 | vdev->config->get(vdev, |
930 | offsetof(struct virtio_net_config, mac), | |
931 | dev->dev_addr, dev->addr_len); | |
62994b2d | 932 | } else |
296f96fc RR |
933 | random_ether_addr(dev->dev_addr); |
934 | ||
935 | /* Set up our device-specific information */ | |
936 | vi = netdev_priv(dev); | |
6c0cd7c0 | 937 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
938 | vi->dev = dev; |
939 | vi->vdev = vdev; | |
d9d5dcc8 | 940 | vdev->priv = vi; |
fb6813f4 | 941 | vi->pages = NULL; |
3161e453 | 942 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
296f96fc | 943 | |
97402b96 | 944 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
945 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
946 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
947 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
948 | vi->big_packets = true; |
949 | ||
3f2c31d9 MM |
950 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
951 | vi->mergeable_rx_bufs = true; | |
952 | ||
d2a7ddda MT |
953 | /* We expect two virtqueues, receive then send, |
954 | * and optionally control. */ | |
955 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; | |
956 | ||
957 | err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names); | |
958 | if (err) | |
296f96fc | 959 | goto free; |
296f96fc | 960 | |
d2a7ddda MT |
961 | vi->rvq = vqs[0]; |
962 | vi->svq = vqs[1]; | |
296f96fc | 963 | |
2a41f71d | 964 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { |
d2a7ddda | 965 | vi->cvq = vqs[2]; |
0bde9569 AW |
966 | |
967 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) | |
968 | dev->features |= NETIF_F_HW_VLAN_FILTER; | |
2a41f71d AW |
969 | } |
970 | ||
296f96fc RR |
971 | err = register_netdev(dev); |
972 | if (err) { | |
973 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 974 | goto free_vqs; |
296f96fc | 975 | } |
b3369c1f RR |
976 | |
977 | /* Last of all, set up some receive buffers. */ | |
3161e453 | 978 | try_fill_recv(vi, GFP_KERNEL); |
b3369c1f RR |
979 | |
980 | /* If we didn't even get one input buffer, we're useless. */ | |
981 | if (vi->num == 0) { | |
982 | err = -ENOMEM; | |
983 | goto unregister; | |
984 | } | |
985 | ||
9f4d26d0 MM |
986 | vi->status = VIRTIO_NET_S_LINK_UP; |
987 | virtnet_update_status(vi); | |
4783256e | 988 | netif_carrier_on(dev); |
9f4d26d0 | 989 | |
296f96fc | 990 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
991 | return 0; |
992 | ||
b3369c1f RR |
993 | unregister: |
994 | unregister_netdev(dev); | |
3161e453 | 995 | cancel_delayed_work_sync(&vi->refill); |
d2a7ddda MT |
996 | free_vqs: |
997 | vdev->config->del_vqs(vdev); | |
296f96fc RR |
998 | free: |
999 | free_netdev(dev); | |
1000 | return err; | |
1001 | } | |
1002 | ||
9ab86bbc SM |
1003 | static void free_unused_bufs(struct virtnet_info *vi) |
1004 | { | |
1005 | void *buf; | |
830a8a97 SM |
1006 | while (1) { |
1007 | buf = vi->svq->vq_ops->detach_unused_buf(vi->svq); | |
1008 | if (!buf) | |
1009 | break; | |
1010 | dev_kfree_skb(buf); | |
1011 | } | |
9ab86bbc SM |
1012 | while (1) { |
1013 | buf = vi->rvq->vq_ops->detach_unused_buf(vi->rvq); | |
1014 | if (!buf) | |
1015 | break; | |
1016 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1017 | give_pages(vi, buf); | |
1018 | else | |
1019 | dev_kfree_skb(buf); | |
1020 | --vi->num; | |
1021 | } | |
1022 | BUG_ON(vi->num != 0); | |
1023 | } | |
1024 | ||
3d1285be | 1025 | static void __devexit virtnet_remove(struct virtio_device *vdev) |
296f96fc | 1026 | { |
74b2553f | 1027 | struct virtnet_info *vi = vdev->priv; |
b3369c1f | 1028 | |
6e5aa7ef RR |
1029 | /* Stop all the virtqueues. */ |
1030 | vdev->config->reset(vdev); | |
1031 | ||
b3369c1f | 1032 | |
74b2553f | 1033 | unregister_netdev(vi->dev); |
3161e453 | 1034 | cancel_delayed_work_sync(&vi->refill); |
830a8a97 SM |
1035 | |
1036 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1037 | free_unused_bufs(vi); |
fb6813f4 | 1038 | |
d2a7ddda MT |
1039 | vdev->config->del_vqs(vi->vdev); |
1040 | ||
fb6813f4 RR |
1041 | while (vi->pages) |
1042 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
1043 | ||
74b2553f | 1044 | free_netdev(vi->dev); |
296f96fc RR |
1045 | } |
1046 | ||
1047 | static struct virtio_device_id id_table[] = { | |
1048 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1049 | { 0 }, | |
1050 | }; | |
1051 | ||
c45a6816 | 1052 | static unsigned int features[] = { |
5e4fe5c4 MM |
1053 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1054 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1055 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1056 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1057 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1058 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1059 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
c45a6816 RR |
1060 | }; |
1061 | ||
22402529 | 1062 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1063 | .feature_table = features, |
1064 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1065 | .driver.name = KBUILD_MODNAME, |
1066 | .driver.owner = THIS_MODULE, | |
1067 | .id_table = id_table, | |
1068 | .probe = virtnet_probe, | |
1069 | .remove = __devexit_p(virtnet_remove), | |
9f4d26d0 | 1070 | .config_changed = virtnet_config_changed, |
296f96fc RR |
1071 | }; |
1072 | ||
1073 | static int __init init(void) | |
1074 | { | |
22402529 | 1075 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1076 | } |
1077 | ||
1078 | static void __exit fini(void) | |
1079 | { | |
22402529 | 1080 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1081 | } |
1082 | module_init(init); | |
1083 | module_exit(fini); | |
1084 | ||
1085 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1086 | MODULE_DESCRIPTION("Virtio network driver"); | |
1087 | MODULE_LICENSE("GPL"); |