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296f96fc RR |
1 | /* A simple network driver using virtio. |
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> | |
27 | ||
6c0cd7c0 DL |
28 | static int napi_weight = 128; |
29 | module_param(napi_weight, int, 0444); | |
30 | ||
34a48579 RR |
31 | static int csum = 1, gso = 1; |
32 | module_param(csum, bool, 0444); | |
33 | module_param(gso, bool, 0444); | |
34 | ||
296f96fc RR |
35 | /* FIXME: MTU in config. */ |
36 | #define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN) | |
37 | ||
38 | struct virtnet_info | |
39 | { | |
40 | struct virtio_device *vdev; | |
41 | struct virtqueue *rvq, *svq; | |
42 | struct net_device *dev; | |
43 | struct napi_struct napi; | |
44 | ||
99ffc696 RR |
45 | /* The skb we couldn't send because buffers were full. */ |
46 | struct sk_buff *last_xmit_skb; | |
47 | ||
363f1514 | 48 | /* If we need to free in a timer, this is it. */ |
14c998f0 MM |
49 | struct timer_list xmit_free_timer; |
50 | ||
296f96fc RR |
51 | /* Number of input buffers, and max we've ever had. */ |
52 | unsigned int num, max; | |
53 | ||
11a3a154 RR |
54 | /* For cleaning up after transmission. */ |
55 | struct tasklet_struct tasklet; | |
363f1514 | 56 | bool free_in_tasklet; |
11a3a154 | 57 | |
97402b96 HX |
58 | /* I like... big packets and I cannot lie! */ |
59 | bool big_packets; | |
60 | ||
296f96fc RR |
61 | /* Receive & send queues. */ |
62 | struct sk_buff_head recv; | |
63 | struct sk_buff_head send; | |
fb6813f4 RR |
64 | |
65 | /* Chain pages by the private ptr. */ | |
66 | struct page *pages; | |
296f96fc RR |
67 | }; |
68 | ||
69 | static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb) | |
70 | { | |
71 | return (struct virtio_net_hdr *)skb->cb; | |
72 | } | |
73 | ||
74 | static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb) | |
75 | { | |
76 | sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr)); | |
77 | } | |
78 | ||
fb6813f4 RR |
79 | static void give_a_page(struct virtnet_info *vi, struct page *page) |
80 | { | |
81 | page->private = (unsigned long)vi->pages; | |
82 | vi->pages = page; | |
83 | } | |
84 | ||
85 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) | |
86 | { | |
87 | struct page *p = vi->pages; | |
88 | ||
89 | if (p) | |
90 | vi->pages = (struct page *)p->private; | |
91 | else | |
92 | p = alloc_page(gfp_mask); | |
93 | return p; | |
94 | } | |
95 | ||
2cb9c6ba | 96 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 97 | { |
2cb9c6ba | 98 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 99 | |
2cb9c6ba RR |
100 | /* Suppress further interrupts. */ |
101 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 102 | |
363f1514 | 103 | /* We were probably waiting for more output buffers. */ |
296f96fc | 104 | netif_wake_queue(vi->dev); |
11a3a154 RR |
105 | |
106 | /* Make sure we re-xmit last_xmit_skb: if there are no more packets | |
107 | * queued, start_xmit won't be called. */ | |
108 | tasklet_schedule(&vi->tasklet); | |
296f96fc RR |
109 | } |
110 | ||
111 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, | |
112 | unsigned len) | |
113 | { | |
114 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | |
97402b96 | 115 | int err; |
296f96fc RR |
116 | |
117 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | |
118 | pr_debug("%s: short packet %i\n", dev->name, len); | |
119 | dev->stats.rx_length_errors++; | |
120 | goto drop; | |
121 | } | |
122 | len -= sizeof(struct virtio_net_hdr); | |
23cde76d | 123 | |
fb6813f4 RR |
124 | if (len <= MAX_PACKET_LEN) { |
125 | unsigned int i; | |
126 | ||
127 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
8f15ea42 WC |
128 | give_a_page(netdev_priv(dev), |
129 | skb_shinfo(skb)->frags[i].page); | |
fb6813f4 RR |
130 | skb->data_len = 0; |
131 | skb_shinfo(skb)->nr_frags = 0; | |
132 | } | |
133 | ||
97402b96 HX |
134 | err = pskb_trim(skb, len); |
135 | if (err) { | |
136 | pr_debug("%s: pskb_trim failed %i %d\n", dev->name, len, err); | |
137 | dev->stats.rx_dropped++; | |
138 | goto drop; | |
139 | } | |
140 | skb->truesize += skb->data_len; | |
296f96fc RR |
141 | dev->stats.rx_bytes += skb->len; |
142 | dev->stats.rx_packets++; | |
143 | ||
144 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
145 | pr_debug("Needs csum!\n"); | |
f35d9d8a | 146 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
296f96fc | 147 | goto frame_err; |
296f96fc RR |
148 | } |
149 | ||
23cde76d MM |
150 | skb->protocol = eth_type_trans(skb, dev); |
151 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
152 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
153 | ||
296f96fc RR |
154 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
155 | pr_debug("GSO!\n"); | |
34a48579 | 156 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
157 | case VIRTIO_NET_HDR_GSO_TCPV4: |
158 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
159 | break; | |
296f96fc RR |
160 | case VIRTIO_NET_HDR_GSO_UDP: |
161 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
162 | break; | |
163 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
164 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
165 | break; | |
166 | default: | |
167 | if (net_ratelimit()) | |
168 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
169 | dev->name, hdr->gso_type); | |
170 | goto frame_err; | |
171 | } | |
172 | ||
34a48579 RR |
173 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
174 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
175 | ||
296f96fc RR |
176 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
177 | if (skb_shinfo(skb)->gso_size == 0) { | |
178 | if (net_ratelimit()) | |
179 | printk(KERN_WARNING "%s: zero gso size.\n", | |
180 | dev->name); | |
181 | goto frame_err; | |
182 | } | |
183 | ||
184 | /* Header must be checked, and gso_segs computed. */ | |
185 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
186 | skb_shinfo(skb)->gso_segs = 0; | |
187 | } | |
188 | ||
189 | netif_receive_skb(skb); | |
190 | return; | |
191 | ||
192 | frame_err: | |
193 | dev->stats.rx_frame_errors++; | |
194 | drop: | |
195 | dev_kfree_skb(skb); | |
196 | } | |
197 | ||
198 | static void try_fill_recv(struct virtnet_info *vi) | |
199 | { | |
200 | struct sk_buff *skb; | |
05271685 | 201 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
97402b96 | 202 | int num, err, i; |
296f96fc | 203 | |
05271685 | 204 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
296f96fc RR |
205 | for (;;) { |
206 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); | |
207 | if (unlikely(!skb)) | |
208 | break; | |
209 | ||
210 | skb_put(skb, MAX_PACKET_LEN); | |
211 | vnet_hdr_to_sg(sg, skb); | |
97402b96 HX |
212 | |
213 | if (vi->big_packets) { | |
214 | for (i = 0; i < MAX_SKB_FRAGS; i++) { | |
215 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
fb6813f4 | 216 | f->page = get_a_page(vi, GFP_ATOMIC); |
97402b96 HX |
217 | if (!f->page) |
218 | break; | |
219 | ||
220 | f->page_offset = 0; | |
221 | f->size = PAGE_SIZE; | |
222 | ||
223 | skb->data_len += PAGE_SIZE; | |
224 | skb->len += PAGE_SIZE; | |
225 | ||
226 | skb_shinfo(skb)->nr_frags++; | |
227 | } | |
228 | } | |
229 | ||
296f96fc RR |
230 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
231 | skb_queue_head(&vi->recv, skb); | |
232 | ||
233 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | |
234 | if (err) { | |
235 | skb_unlink(skb, &vi->recv); | |
236 | kfree_skb(skb); | |
237 | break; | |
238 | } | |
239 | vi->num++; | |
240 | } | |
241 | if (unlikely(vi->num > vi->max)) | |
242 | vi->max = vi->num; | |
243 | vi->rvq->vq_ops->kick(vi->rvq); | |
244 | } | |
245 | ||
18445c4d | 246 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
247 | { |
248 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d RR |
249 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
250 | if (netif_rx_schedule_prep(vi->dev, &vi->napi)) { | |
251 | rvq->vq_ops->disable_cb(rvq); | |
252 | __netif_rx_schedule(vi->dev, &vi->napi); | |
253 | } | |
296f96fc RR |
254 | } |
255 | ||
256 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
257 | { | |
258 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
259 | struct sk_buff *skb = NULL; | |
260 | unsigned int len, received = 0; | |
261 | ||
262 | again: | |
263 | while (received < budget && | |
264 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | |
265 | __skb_unlink(skb, &vi->recv); | |
266 | receive_skb(vi->dev, skb, len); | |
267 | vi->num--; | |
268 | received++; | |
269 | } | |
270 | ||
271 | /* FIXME: If we oom and completely run out of inbufs, we need | |
272 | * to start a timer trying to fill more. */ | |
273 | if (vi->num < vi->max / 2) | |
274 | try_fill_recv(vi); | |
275 | ||
8329d98e RR |
276 | /* Out of packets? */ |
277 | if (received < budget) { | |
296f96fc | 278 | netif_rx_complete(vi->dev, napi); |
18445c4d | 279 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
4265f161 CB |
280 | && napi_schedule_prep(napi)) { |
281 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
282 | __netif_rx_schedule(vi->dev, napi); | |
296f96fc | 283 | goto again; |
4265f161 | 284 | } |
296f96fc RR |
285 | } |
286 | ||
287 | return received; | |
288 | } | |
289 | ||
290 | static void free_old_xmit_skbs(struct virtnet_info *vi) | |
291 | { | |
292 | struct sk_buff *skb; | |
293 | unsigned int len; | |
294 | ||
295 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
296 | pr_debug("Sent skb %p\n", skb); | |
297 | __skb_unlink(skb, &vi->send); | |
655aa31f | 298 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc RR |
299 | vi->dev->stats.tx_packets++; |
300 | kfree_skb(skb); | |
301 | } | |
302 | } | |
303 | ||
363f1514 RR |
304 | /* If the virtio transport doesn't always notify us when all in-flight packets |
305 | * are consumed, we fall back to using this function on a timer to free them. */ | |
14c998f0 MM |
306 | static void xmit_free(unsigned long data) |
307 | { | |
308 | struct virtnet_info *vi = (void *)data; | |
309 | ||
310 | netif_tx_lock(vi->dev); | |
311 | ||
312 | free_old_xmit_skbs(vi); | |
313 | ||
314 | if (!skb_queue_empty(&vi->send)) | |
315 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); | |
316 | ||
317 | netif_tx_unlock(vi->dev); | |
318 | } | |
319 | ||
99ffc696 | 320 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 321 | { |
14c998f0 | 322 | int num, err; |
05271685 | 323 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
296f96fc RR |
324 | struct virtio_net_hdr *hdr; |
325 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; | |
296f96fc | 326 | |
05271685 | 327 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 328 | |
e174961c | 329 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 330 | |
296f96fc RR |
331 | /* Encode metadata header at front. */ |
332 | hdr = skb_vnet_hdr(skb); | |
333 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
334 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
335 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | |
336 | hdr->csum_offset = skb->csum_offset; | |
337 | } else { | |
338 | hdr->flags = 0; | |
339 | hdr->csum_offset = hdr->csum_start = 0; | |
340 | } | |
341 | ||
342 | if (skb_is_gso(skb)) { | |
50c8ea80 | 343 | hdr->hdr_len = skb_transport_header(skb) - skb->data; |
296f96fc | 344 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
34a48579 | 345 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
296f96fc RR |
346 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
347 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
348 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
349 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
350 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
351 | else | |
352 | BUG(); | |
34a48579 RR |
353 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
354 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
296f96fc RR |
355 | } else { |
356 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
50c8ea80 | 357 | hdr->gso_size = hdr->hdr_len = 0; |
296f96fc RR |
358 | } |
359 | ||
360 | vnet_hdr_to_sg(sg, skb); | |
361 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | |
99ffc696 | 362 | |
14c998f0 | 363 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); |
363f1514 | 364 | if (!err && !vi->free_in_tasklet) |
14c998f0 MM |
365 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
366 | ||
367 | return err; | |
99ffc696 RR |
368 | } |
369 | ||
11a3a154 RR |
370 | static void xmit_tasklet(unsigned long data) |
371 | { | |
372 | struct virtnet_info *vi = (void *)data; | |
373 | ||
374 | netif_tx_lock_bh(vi->dev); | |
375 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { | |
376 | vi->svq->vq_ops->kick(vi->svq); | |
377 | vi->last_xmit_skb = NULL; | |
378 | } | |
363f1514 RR |
379 | if (vi->free_in_tasklet) |
380 | free_old_xmit_skbs(vi); | |
11a3a154 RR |
381 | netif_tx_unlock_bh(vi->dev); |
382 | } | |
383 | ||
99ffc696 RR |
384 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) |
385 | { | |
386 | struct virtnet_info *vi = netdev_priv(dev); | |
2cb9c6ba RR |
387 | |
388 | again: | |
389 | /* Free up any pending old buffers before queueing new ones. */ | |
390 | free_old_xmit_skbs(vi); | |
99ffc696 RR |
391 | |
392 | /* If we has a buffer left over from last time, send it now. */ | |
9953ca6c MM |
393 | if (unlikely(vi->last_xmit_skb) && |
394 | xmit_skb(vi, vi->last_xmit_skb) != 0) | |
395 | goto stop_queue; | |
396 | ||
397 | vi->last_xmit_skb = NULL; | |
2cb9c6ba | 398 | |
99ffc696 | 399 | /* Put new one in send queue and do transmit */ |
7eb2e251 RR |
400 | if (likely(skb)) { |
401 | __skb_queue_head(&vi->send, skb); | |
402 | if (xmit_skb(vi, skb) != 0) { | |
403 | vi->last_xmit_skb = skb; | |
404 | skb = NULL; | |
405 | goto stop_queue; | |
406 | } | |
296f96fc | 407 | } |
99ffc696 | 408 | done: |
296f96fc | 409 | vi->svq->vq_ops->kick(vi->svq); |
99ffc696 RR |
410 | return NETDEV_TX_OK; |
411 | ||
412 | stop_queue: | |
413 | pr_debug("%s: virtio not prepared to send\n", dev->name); | |
414 | netif_stop_queue(dev); | |
415 | ||
416 | /* Activate callback for using skbs: if this returns false it | |
417 | * means some were used in the meantime. */ | |
418 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
419 | vi->svq->vq_ops->disable_cb(vi->svq); | |
420 | netif_start_queue(dev); | |
421 | goto again; | |
422 | } | |
9953ca6c MM |
423 | if (skb) { |
424 | /* Drop this skb: we only queue one. */ | |
425 | vi->dev->stats.tx_dropped++; | |
426 | kfree_skb(skb); | |
427 | } | |
99ffc696 | 428 | goto done; |
296f96fc RR |
429 | } |
430 | ||
da74e89d AS |
431 | #ifdef CONFIG_NET_POLL_CONTROLLER |
432 | static void virtnet_netpoll(struct net_device *dev) | |
433 | { | |
434 | struct virtnet_info *vi = netdev_priv(dev); | |
435 | ||
436 | napi_schedule(&vi->napi); | |
437 | } | |
438 | #endif | |
439 | ||
296f96fc RR |
440 | static int virtnet_open(struct net_device *dev) |
441 | { | |
442 | struct virtnet_info *vi = netdev_priv(dev); | |
443 | ||
296f96fc | 444 | napi_enable(&vi->napi); |
a48bd8f6 RR |
445 | |
446 | /* If all buffers were filled by other side before we napi_enabled, we | |
447 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
448 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
449 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
450 | if (netif_rx_schedule_prep(dev, &vi->napi)) { | |
451 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
452 | __netif_rx_schedule(dev, &vi->napi); | |
453 | } | |
296f96fc RR |
454 | return 0; |
455 | } | |
456 | ||
457 | static int virtnet_close(struct net_device *dev) | |
458 | { | |
459 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
460 | |
461 | napi_disable(&vi->napi); | |
462 | ||
296f96fc RR |
463 | return 0; |
464 | } | |
465 | ||
a9ea3fc6 HX |
466 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
467 | { | |
468 | struct virtnet_info *vi = netdev_priv(dev); | |
469 | struct virtio_device *vdev = vi->vdev; | |
470 | ||
471 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) | |
472 | return -ENOSYS; | |
473 | ||
474 | return ethtool_op_set_tx_hw_csum(dev, data); | |
475 | } | |
476 | ||
477 | static struct ethtool_ops virtnet_ethtool_ops = { | |
478 | .set_tx_csum = virtnet_set_tx_csum, | |
479 | .set_sg = ethtool_op_set_sg, | |
480 | }; | |
481 | ||
296f96fc RR |
482 | static int virtnet_probe(struct virtio_device *vdev) |
483 | { | |
484 | int err; | |
296f96fc RR |
485 | struct net_device *dev; |
486 | struct virtnet_info *vi; | |
296f96fc RR |
487 | |
488 | /* Allocate ourselves a network device with room for our info */ | |
489 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
490 | if (!dev) | |
491 | return -ENOMEM; | |
492 | ||
493 | /* Set up network device as normal. */ | |
296f96fc RR |
494 | dev->open = virtnet_open; |
495 | dev->stop = virtnet_close; | |
496 | dev->hard_start_xmit = start_xmit; | |
497 | dev->features = NETIF_F_HIGHDMA; | |
da74e89d AS |
498 | #ifdef CONFIG_NET_POLL_CONTROLLER |
499 | dev->poll_controller = virtnet_netpoll; | |
500 | #endif | |
a9ea3fc6 | 501 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
502 | SET_NETDEV_DEV(dev, &vdev->dev); |
503 | ||
504 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 505 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
506 | /* This opens up the world of extra features. */ |
507 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 508 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
509 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
510 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
511 | } | |
5539ae96 | 512 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 513 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 514 | dev->features |= NETIF_F_TSO; |
c45a6816 | 515 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 516 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 517 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 518 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 519 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 520 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
521 | } |
522 | ||
523 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 524 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
525 | vdev->config->get(vdev, |
526 | offsetof(struct virtio_net_config, mac), | |
527 | dev->dev_addr, dev->addr_len); | |
296f96fc RR |
528 | } else |
529 | random_ether_addr(dev->dev_addr); | |
530 | ||
531 | /* Set up our device-specific information */ | |
532 | vi = netdev_priv(dev); | |
6c0cd7c0 | 533 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
534 | vi->dev = dev; |
535 | vi->vdev = vdev; | |
d9d5dcc8 | 536 | vdev->priv = vi; |
fb6813f4 | 537 | vi->pages = NULL; |
296f96fc | 538 | |
363f1514 RR |
539 | /* If they give us a callback when all buffers are done, we don't need |
540 | * the timer. */ | |
541 | vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); | |
542 | ||
97402b96 HX |
543 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
544 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) | |
545 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) | |
546 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
547 | vi->big_packets = true; | |
548 | ||
296f96fc | 549 | /* We expect two virtqueues, receive then send. */ |
a586d4f6 | 550 | vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); |
296f96fc RR |
551 | if (IS_ERR(vi->rvq)) { |
552 | err = PTR_ERR(vi->rvq); | |
553 | goto free; | |
554 | } | |
555 | ||
a586d4f6 | 556 | vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done); |
296f96fc RR |
557 | if (IS_ERR(vi->svq)) { |
558 | err = PTR_ERR(vi->svq); | |
559 | goto free_recv; | |
560 | } | |
561 | ||
562 | /* Initialize our empty receive and send queues. */ | |
563 | skb_queue_head_init(&vi->recv); | |
564 | skb_queue_head_init(&vi->send); | |
565 | ||
11a3a154 RR |
566 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
567 | ||
363f1514 RR |
568 | if (!vi->free_in_tasklet) |
569 | setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); | |
14c998f0 | 570 | |
296f96fc RR |
571 | err = register_netdev(dev); |
572 | if (err) { | |
573 | pr_debug("virtio_net: registering device failed\n"); | |
574 | goto free_send; | |
575 | } | |
b3369c1f RR |
576 | |
577 | /* Last of all, set up some receive buffers. */ | |
578 | try_fill_recv(vi); | |
579 | ||
580 | /* If we didn't even get one input buffer, we're useless. */ | |
581 | if (vi->num == 0) { | |
582 | err = -ENOMEM; | |
583 | goto unregister; | |
584 | } | |
585 | ||
296f96fc | 586 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
587 | return 0; |
588 | ||
b3369c1f RR |
589 | unregister: |
590 | unregister_netdev(dev); | |
296f96fc RR |
591 | free_send: |
592 | vdev->config->del_vq(vi->svq); | |
593 | free_recv: | |
594 | vdev->config->del_vq(vi->rvq); | |
595 | free: | |
596 | free_netdev(dev); | |
597 | return err; | |
598 | } | |
599 | ||
600 | static void virtnet_remove(struct virtio_device *vdev) | |
601 | { | |
74b2553f | 602 | struct virtnet_info *vi = vdev->priv; |
b3369c1f RR |
603 | struct sk_buff *skb; |
604 | ||
6e5aa7ef RR |
605 | /* Stop all the virtqueues. */ |
606 | vdev->config->reset(vdev); | |
607 | ||
363f1514 RR |
608 | if (!vi->free_in_tasklet) |
609 | del_timer_sync(&vi->xmit_free_timer); | |
14c998f0 | 610 | |
b3369c1f | 611 | /* Free our skbs in send and recv queues, if any. */ |
b3369c1f RR |
612 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
613 | kfree_skb(skb); | |
614 | vi->num--; | |
615 | } | |
288369cc | 616 | __skb_queue_purge(&vi->send); |
b3369c1f RR |
617 | |
618 | BUG_ON(vi->num != 0); | |
74b2553f RR |
619 | |
620 | vdev->config->del_vq(vi->svq); | |
621 | vdev->config->del_vq(vi->rvq); | |
622 | unregister_netdev(vi->dev); | |
fb6813f4 RR |
623 | |
624 | while (vi->pages) | |
625 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
626 | ||
74b2553f | 627 | free_netdev(vi->dev); |
296f96fc RR |
628 | } |
629 | ||
630 | static struct virtio_device_id id_table[] = { | |
631 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
632 | { 0 }, | |
633 | }; | |
634 | ||
c45a6816 | 635 | static unsigned int features[] = { |
5e4fe5c4 MM |
636 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
637 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 638 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 HX |
639 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
640 | VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */ | |
641 | VIRTIO_F_NOTIFY_ON_EMPTY, | |
c45a6816 RR |
642 | }; |
643 | ||
296f96fc | 644 | static struct virtio_driver virtio_net = { |
c45a6816 RR |
645 | .feature_table = features, |
646 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
647 | .driver.name = KBUILD_MODNAME, |
648 | .driver.owner = THIS_MODULE, | |
649 | .id_table = id_table, | |
650 | .probe = virtnet_probe, | |
651 | .remove = __devexit_p(virtnet_remove), | |
652 | }; | |
653 | ||
654 | static int __init init(void) | |
655 | { | |
656 | return register_virtio_driver(&virtio_net); | |
657 | } | |
658 | ||
659 | static void __exit fini(void) | |
660 | { | |
661 | unregister_virtio_driver(&virtio_net); | |
662 | } | |
663 | module_init(init); | |
664 | module_exit(fini); | |
665 | ||
666 | MODULE_DEVICE_TABLE(virtio, id_table); | |
667 | MODULE_DESCRIPTION("Virtio network driver"); | |
668 | MODULE_LICENSE("GPL"); |