diff options
author | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-21 21:03:37 -0400 |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 01:49:54 -0400 |
commit | 296f96fcfc160e29c01819c0c7b20c2dc8320edd (patch) | |
tree | ad9c11fe2f60ca37c4bf736f919c3332cffebd9f | |
parent | ec3d41c4db4c21164332826ea8d812f94f2f6886 (diff) |
Net driver using virtio
The network driver uses two virtqueues: one for input packets and one
for output packets. This has nice locking properties (ie. we don't do
any for recv vs send).
TODO:
1) Big packets.
2) Multi-client devices (maybe separate driver?).
3) Resolve freeing of old xmit skbs (Christian Borntraeger)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: netdev@vger.kernel.org
-rw-r--r-- | drivers/net/Kconfig | 6 | ||||
-rw-r--r-- | drivers/net/Makefile | 1 | ||||
-rw-r--r-- | drivers/net/virtio_net.c | 435 | ||||
-rw-r--r-- | include/linux/Kbuild | 1 | ||||
-rw-r--r-- | include/linux/virtio_net.h | 36 |
5 files changed, 479 insertions, 0 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index ce34b539bf38..2538816817aa 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig | |||
@@ -3100,4 +3100,10 @@ config NETPOLL_TRAP | |||
3100 | config NET_POLL_CONTROLLER | 3100 | config NET_POLL_CONTROLLER |
3101 | def_bool NETPOLL | 3101 | def_bool NETPOLL |
3102 | 3102 | ||
3103 | config VIRTIO_NET | ||
3104 | tristate "Virtio network driver (EXPERIMENTAL)" | ||
3105 | depends on EXPERIMENTAL && VIRTIO | ||
3106 | ---help--- | ||
3107 | This is the virtual network driver for lguest. Say Y or M. | ||
3108 | |||
3103 | endif # NETDEVICES | 3109 | endif # NETDEVICES |
diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 22f78cbd126b..6745feb690ff 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile | |||
@@ -243,3 +243,4 @@ obj-$(CONFIG_FS_ENET) += fs_enet/ | |||
243 | 243 | ||
244 | obj-$(CONFIG_NETXEN_NIC) += netxen/ | 244 | obj-$(CONFIG_NETXEN_NIC) += netxen/ |
245 | obj-$(CONFIG_NIU) += niu.o | 245 | obj-$(CONFIG_NIU) += niu.o |
246 | obj-$(CONFIG_VIRTIO_NET) += virtio_net.o | ||
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c new file mode 100644 index 000000000000..e396c9d2af8d --- /dev/null +++ b/drivers/net/virtio_net.c | |||
@@ -0,0 +1,435 @@ | |||
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> | ||
22 | #include <linux/module.h> | ||
23 | #include <linux/virtio.h> | ||
24 | #include <linux/virtio_net.h> | ||
25 | #include <linux/scatterlist.h> | ||
26 | |||
27 | /* FIXME: MTU in config. */ | ||
28 | #define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN) | ||
29 | |||
30 | struct virtnet_info | ||
31 | { | ||
32 | struct virtio_device *vdev; | ||
33 | struct virtqueue *rvq, *svq; | ||
34 | struct net_device *dev; | ||
35 | struct napi_struct napi; | ||
36 | |||
37 | /* Number of input buffers, and max we've ever had. */ | ||
38 | unsigned int num, max; | ||
39 | |||
40 | /* Receive & send queues. */ | ||
41 | struct sk_buff_head recv; | ||
42 | struct sk_buff_head send; | ||
43 | }; | ||
44 | |||
45 | static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb) | ||
46 | { | ||
47 | return (struct virtio_net_hdr *)skb->cb; | ||
48 | } | ||
49 | |||
50 | static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb) | ||
51 | { | ||
52 | sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr)); | ||
53 | } | ||
54 | |||
55 | static bool skb_xmit_done(struct virtqueue *rvq) | ||
56 | { | ||
57 | struct virtnet_info *vi = rvq->vdev->priv; | ||
58 | |||
59 | /* In case we were waiting for output buffers. */ | ||
60 | netif_wake_queue(vi->dev); | ||
61 | return true; | ||
62 | } | ||
63 | |||
64 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, | ||
65 | unsigned len) | ||
66 | { | ||
67 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | ||
68 | |||
69 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | ||
70 | pr_debug("%s: short packet %i\n", dev->name, len); | ||
71 | dev->stats.rx_length_errors++; | ||
72 | goto drop; | ||
73 | } | ||
74 | len -= sizeof(struct virtio_net_hdr); | ||
75 | BUG_ON(len > MAX_PACKET_LEN); | ||
76 | |||
77 | skb_trim(skb, len); | ||
78 | skb->protocol = eth_type_trans(skb, dev); | ||
79 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | ||
80 | ntohs(skb->protocol), skb->len, skb->pkt_type); | ||
81 | dev->stats.rx_bytes += skb->len; | ||
82 | dev->stats.rx_packets++; | ||
83 | |||
84 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | ||
85 | pr_debug("Needs csum!\n"); | ||
86 | skb->ip_summed = CHECKSUM_PARTIAL; | ||
87 | skb->csum_start = hdr->csum_start; | ||
88 | skb->csum_offset = hdr->csum_offset; | ||
89 | if (skb->csum_start > skb->len - 2 | ||
90 | || skb->csum_offset > skb->len - 2) { | ||
91 | if (net_ratelimit()) | ||
92 | printk(KERN_WARNING "%s: csum=%u/%u len=%u\n", | ||
93 | dev->name, skb->csum_start, | ||
94 | skb->csum_offset, skb->len); | ||
95 | goto frame_err; | ||
96 | } | ||
97 | } | ||
98 | |||
99 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | ||
100 | pr_debug("GSO!\n"); | ||
101 | switch (hdr->gso_type) { | ||
102 | case VIRTIO_NET_HDR_GSO_TCPV4: | ||
103 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | ||
104 | break; | ||
105 | case VIRTIO_NET_HDR_GSO_TCPV4_ECN: | ||
106 | skb_shinfo(skb)->gso_type = SKB_GSO_TCP_ECN; | ||
107 | break; | ||
108 | case VIRTIO_NET_HDR_GSO_UDP: | ||
109 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | ||
110 | break; | ||
111 | case VIRTIO_NET_HDR_GSO_TCPV6: | ||
112 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | ||
113 | break; | ||
114 | default: | ||
115 | if (net_ratelimit()) | ||
116 | printk(KERN_WARNING "%s: bad gso type %u.\n", | ||
117 | dev->name, hdr->gso_type); | ||
118 | goto frame_err; | ||
119 | } | ||
120 | |||
121 | skb_shinfo(skb)->gso_size = hdr->gso_size; | ||
122 | if (skb_shinfo(skb)->gso_size == 0) { | ||
123 | if (net_ratelimit()) | ||
124 | printk(KERN_WARNING "%s: zero gso size.\n", | ||
125 | dev->name); | ||
126 | goto frame_err; | ||
127 | } | ||
128 | |||
129 | /* Header must be checked, and gso_segs computed. */ | ||
130 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | ||
131 | skb_shinfo(skb)->gso_segs = 0; | ||
132 | } | ||
133 | |||
134 | netif_receive_skb(skb); | ||
135 | return; | ||
136 | |||
137 | frame_err: | ||
138 | dev->stats.rx_frame_errors++; | ||
139 | drop: | ||
140 | dev_kfree_skb(skb); | ||
141 | } | ||
142 | |||
143 | static void try_fill_recv(struct virtnet_info *vi) | ||
144 | { | ||
145 | struct sk_buff *skb; | ||
146 | struct scatterlist sg[1+MAX_SKB_FRAGS]; | ||
147 | int num, err; | ||
148 | |||
149 | for (;;) { | ||
150 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); | ||
151 | if (unlikely(!skb)) | ||
152 | break; | ||
153 | |||
154 | skb_put(skb, MAX_PACKET_LEN); | ||
155 | vnet_hdr_to_sg(sg, skb); | ||
156 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | ||
157 | skb_queue_head(&vi->recv, skb); | ||
158 | |||
159 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | ||
160 | if (err) { | ||
161 | skb_unlink(skb, &vi->recv); | ||
162 | kfree_skb(skb); | ||
163 | break; | ||
164 | } | ||
165 | vi->num++; | ||
166 | } | ||
167 | if (unlikely(vi->num > vi->max)) | ||
168 | vi->max = vi->num; | ||
169 | vi->rvq->vq_ops->kick(vi->rvq); | ||
170 | } | ||
171 | |||
172 | static bool skb_recv_done(struct virtqueue *rvq) | ||
173 | { | ||
174 | struct virtnet_info *vi = rvq->vdev->priv; | ||
175 | netif_rx_schedule(vi->dev, &vi->napi); | ||
176 | /* Suppress further interrupts. */ | ||
177 | return false; | ||
178 | } | ||
179 | |||
180 | static int virtnet_poll(struct napi_struct *napi, int budget) | ||
181 | { | ||
182 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | ||
183 | struct sk_buff *skb = NULL; | ||
184 | unsigned int len, received = 0; | ||
185 | |||
186 | again: | ||
187 | while (received < budget && | ||
188 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | ||
189 | __skb_unlink(skb, &vi->recv); | ||
190 | receive_skb(vi->dev, skb, len); | ||
191 | vi->num--; | ||
192 | received++; | ||
193 | } | ||
194 | |||
195 | /* FIXME: If we oom and completely run out of inbufs, we need | ||
196 | * to start a timer trying to fill more. */ | ||
197 | if (vi->num < vi->max / 2) | ||
198 | try_fill_recv(vi); | ||
199 | |||
200 | /* All done? */ | ||
201 | if (!skb) { | ||
202 | netif_rx_complete(vi->dev, napi); | ||
203 | if (unlikely(!vi->rvq->vq_ops->restart(vi->rvq)) | ||
204 | && netif_rx_reschedule(vi->dev, napi)) | ||
205 | goto again; | ||
206 | } | ||
207 | |||
208 | return received; | ||
209 | } | ||
210 | |||
211 | static void free_old_xmit_skbs(struct virtnet_info *vi) | ||
212 | { | ||
213 | struct sk_buff *skb; | ||
214 | unsigned int len; | ||
215 | |||
216 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | ||
217 | pr_debug("Sent skb %p\n", skb); | ||
218 | __skb_unlink(skb, &vi->send); | ||
219 | vi->dev->stats.tx_bytes += len; | ||
220 | vi->dev->stats.tx_packets++; | ||
221 | kfree_skb(skb); | ||
222 | } | ||
223 | } | ||
224 | |||
225 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) | ||
226 | { | ||
227 | struct virtnet_info *vi = netdev_priv(dev); | ||
228 | int num, err; | ||
229 | struct scatterlist sg[1+MAX_SKB_FRAGS]; | ||
230 | struct virtio_net_hdr *hdr; | ||
231 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; | ||
232 | DECLARE_MAC_BUF(mac); | ||
233 | |||
234 | pr_debug("%s: xmit %p %s\n", dev->name, skb, print_mac(mac, dest)); | ||
235 | |||
236 | free_old_xmit_skbs(vi); | ||
237 | |||
238 | /* Encode metadata header at front. */ | ||
239 | hdr = skb_vnet_hdr(skb); | ||
240 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | ||
241 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | ||
242 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | ||
243 | hdr->csum_offset = skb->csum_offset; | ||
244 | } else { | ||
245 | hdr->flags = 0; | ||
246 | hdr->csum_offset = hdr->csum_start = 0; | ||
247 | } | ||
248 | |||
249 | if (skb_is_gso(skb)) { | ||
250 | hdr->gso_size = skb_shinfo(skb)->gso_size; | ||
251 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) | ||
252 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4_ECN; | ||
253 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) | ||
254 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | ||
255 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | ||
256 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | ||
257 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | ||
258 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | ||
259 | else | ||
260 | BUG(); | ||
261 | } else { | ||
262 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | ||
263 | hdr->gso_size = 0; | ||
264 | } | ||
265 | |||
266 | vnet_hdr_to_sg(sg, skb); | ||
267 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | ||
268 | __skb_queue_head(&vi->send, skb); | ||
269 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); | ||
270 | if (err) { | ||
271 | pr_debug("%s: virtio not prepared to send\n", dev->name); | ||
272 | skb_unlink(skb, &vi->send); | ||
273 | netif_stop_queue(dev); | ||
274 | return NETDEV_TX_BUSY; | ||
275 | } | ||
276 | vi->svq->vq_ops->kick(vi->svq); | ||
277 | |||
278 | return 0; | ||
279 | } | ||
280 | |||
281 | static int virtnet_open(struct net_device *dev) | ||
282 | { | ||
283 | struct virtnet_info *vi = netdev_priv(dev); | ||
284 | |||
285 | try_fill_recv(vi); | ||
286 | |||
287 | /* If we didn't even get one input buffer, we're useless. */ | ||
288 | if (vi->num == 0) | ||
289 | return -ENOMEM; | ||
290 | |||
291 | napi_enable(&vi->napi); | ||
292 | return 0; | ||
293 | } | ||
294 | |||
295 | static int virtnet_close(struct net_device *dev) | ||
296 | { | ||
297 | struct virtnet_info *vi = netdev_priv(dev); | ||
298 | struct sk_buff *skb; | ||
299 | |||
300 | napi_disable(&vi->napi); | ||
301 | |||
302 | /* networking core has neutered skb_xmit_done/skb_recv_done, so don't | ||
303 | * worry about races vs. get(). */ | ||
304 | vi->rvq->vq_ops->shutdown(vi->rvq); | ||
305 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { | ||
306 | kfree_skb(skb); | ||
307 | vi->num--; | ||
308 | } | ||
309 | vi->svq->vq_ops->shutdown(vi->svq); | ||
310 | while ((skb = __skb_dequeue(&vi->send)) != NULL) | ||
311 | kfree_skb(skb); | ||
312 | |||
313 | BUG_ON(vi->num != 0); | ||
314 | return 0; | ||
315 | } | ||
316 | |||
317 | static int virtnet_probe(struct virtio_device *vdev) | ||
318 | { | ||
319 | int err; | ||
320 | unsigned int len; | ||
321 | struct net_device *dev; | ||
322 | struct virtnet_info *vi; | ||
323 | void *token; | ||
324 | |||
325 | /* Allocate ourselves a network device with room for our info */ | ||
326 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | ||
327 | if (!dev) | ||
328 | return -ENOMEM; | ||
329 | |||
330 | /* Set up network device as normal. */ | ||
331 | ether_setup(dev); | ||
332 | dev->open = virtnet_open; | ||
333 | dev->stop = virtnet_close; | ||
334 | dev->hard_start_xmit = start_xmit; | ||
335 | dev->features = NETIF_F_HIGHDMA; | ||
336 | SET_NETDEV_DEV(dev, &vdev->dev); | ||
337 | |||
338 | /* Do we support "hardware" checksums? */ | ||
339 | token = vdev->config->find(vdev, VIRTIO_CONFIG_NET_F, &len); | ||
340 | if (virtio_use_bit(vdev, token, len, VIRTIO_NET_F_NO_CSUM)) { | ||
341 | /* This opens up the world of extra features. */ | ||
342 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | ||
343 | if (virtio_use_bit(vdev, token, len, VIRTIO_NET_F_TSO4)) | ||
344 | dev->features |= NETIF_F_TSO; | ||
345 | if (virtio_use_bit(vdev, token, len, VIRTIO_NET_F_UFO)) | ||
346 | dev->features |= NETIF_F_UFO; | ||
347 | if (virtio_use_bit(vdev, token, len, VIRTIO_NET_F_TSO4_ECN)) | ||
348 | dev->features |= NETIF_F_TSO_ECN; | ||
349 | if (virtio_use_bit(vdev, token, len, VIRTIO_NET_F_TSO6)) | ||
350 | dev->features |= NETIF_F_TSO6; | ||
351 | } | ||
352 | |||
353 | /* Configuration may specify what MAC to use. Otherwise random. */ | ||
354 | token = vdev->config->find(vdev, VIRTIO_CONFIG_NET_MAC_F, &len); | ||
355 | if (token) { | ||
356 | dev->addr_len = len; | ||
357 | vdev->config->get(vdev, token, dev->dev_addr, len); | ||
358 | } else | ||
359 | random_ether_addr(dev->dev_addr); | ||
360 | |||
361 | /* Set up our device-specific information */ | ||
362 | vi = netdev_priv(dev); | ||
363 | netif_napi_add(dev, &vi->napi, virtnet_poll, 16); | ||
364 | vi->dev = dev; | ||
365 | vi->vdev = vdev; | ||
366 | |||
367 | /* We expect two virtqueues, receive then send. */ | ||
368 | vi->rvq = vdev->config->find_vq(vdev, skb_recv_done); | ||
369 | if (IS_ERR(vi->rvq)) { | ||
370 | err = PTR_ERR(vi->rvq); | ||
371 | goto free; | ||
372 | } | ||
373 | |||
374 | vi->svq = vdev->config->find_vq(vdev, skb_xmit_done); | ||
375 | if (IS_ERR(vi->svq)) { | ||
376 | err = PTR_ERR(vi->svq); | ||
377 | goto free_recv; | ||
378 | } | ||
379 | |||
380 | /* Initialize our empty receive and send queues. */ | ||
381 | skb_queue_head_init(&vi->recv); | ||
382 | skb_queue_head_init(&vi->send); | ||
383 | |||
384 | err = register_netdev(dev); | ||
385 | if (err) { | ||
386 | pr_debug("virtio_net: registering device failed\n"); | ||
387 | goto free_send; | ||
388 | } | ||
389 | pr_debug("virtnet: registered device %s\n", dev->name); | ||
390 | vdev->priv = vi; | ||
391 | return 0; | ||
392 | |||
393 | free_send: | ||
394 | vdev->config->del_vq(vi->svq); | ||
395 | free_recv: | ||
396 | vdev->config->del_vq(vi->rvq); | ||
397 | free: | ||
398 | free_netdev(dev); | ||
399 | return err; | ||
400 | } | ||
401 | |||
402 | static void virtnet_remove(struct virtio_device *vdev) | ||
403 | { | ||
404 | unregister_netdev(vdev->priv); | ||
405 | free_netdev(vdev->priv); | ||
406 | } | ||
407 | |||
408 | static struct virtio_device_id id_table[] = { | ||
409 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | ||
410 | { 0 }, | ||
411 | }; | ||
412 | |||
413 | static struct virtio_driver virtio_net = { | ||
414 | .driver.name = KBUILD_MODNAME, | ||
415 | .driver.owner = THIS_MODULE, | ||
416 | .id_table = id_table, | ||
417 | .probe = virtnet_probe, | ||
418 | .remove = __devexit_p(virtnet_remove), | ||
419 | }; | ||
420 | |||
421 | static int __init init(void) | ||
422 | { | ||
423 | return register_virtio_driver(&virtio_net); | ||
424 | } | ||
425 | |||
426 | static void __exit fini(void) | ||
427 | { | ||
428 | unregister_virtio_driver(&virtio_net); | ||
429 | } | ||
430 | module_init(init); | ||
431 | module_exit(fini); | ||
432 | |||
433 | MODULE_DEVICE_TABLE(virtio, id_table); | ||
434 | MODULE_DESCRIPTION("Virtio network driver"); | ||
435 | MODULE_LICENSE("GPL"); | ||
diff --git a/include/linux/Kbuild b/include/linux/Kbuild index e5208f283a67..b101588a4b5a 100644 --- a/include/linux/Kbuild +++ b/include/linux/Kbuild | |||
@@ -344,6 +344,7 @@ unifdef-y += utsname.h | |||
344 | unifdef-y += videodev2.h | 344 | unifdef-y += videodev2.h |
345 | unifdef-y += videodev.h | 345 | unifdef-y += videodev.h |
346 | unifdef-y += virtio_config.h | 346 | unifdef-y += virtio_config.h |
347 | unifdef-y += virtio_net.h | ||
347 | unifdef-y += wait.h | 348 | unifdef-y += wait.h |
348 | unifdef-y += wanrouter.h | 349 | unifdef-y += wanrouter.h |
349 | unifdef-y += watchdog.h | 350 | unifdef-y += watchdog.h |
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h new file mode 100644 index 000000000000..ae469ae55d36 --- /dev/null +++ b/include/linux/virtio_net.h | |||
@@ -0,0 +1,36 @@ | |||
1 | #ifndef _LINUX_VIRTIO_NET_H | ||
2 | #define _LINUX_VIRTIO_NET_H | ||
3 | #include <linux/virtio_config.h> | ||
4 | |||
5 | /* The ID for virtio_net */ | ||
6 | #define VIRTIO_ID_NET 1 | ||
7 | |||
8 | /* The bitmap of config for virtio net */ | ||
9 | #define VIRTIO_CONFIG_NET_F 0x40 | ||
10 | #define VIRTIO_NET_F_NO_CSUM 0 | ||
11 | #define VIRTIO_NET_F_TSO4 1 | ||
12 | #define VIRTIO_NET_F_UFO 2 | ||
13 | #define VIRTIO_NET_F_TSO4_ECN 3 | ||
14 | #define VIRTIO_NET_F_TSO6 4 | ||
15 | |||
16 | /* The config defining mac address. */ | ||
17 | #define VIRTIO_CONFIG_NET_MAC_F 0x41 | ||
18 | |||
19 | /* This is the first element of the scatter-gather list. If you don't | ||
20 | * specify GSO or CSUM features, you can simply ignore the header. */ | ||
21 | struct virtio_net_hdr | ||
22 | { | ||
23 | #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset | ||
24 | __u8 flags; | ||
25 | #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame | ||
26 | #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) | ||
27 | /* FIXME: Do we need this? If they said they can handle ECN, do they care? */ | ||
28 | #define VIRTIO_NET_HDR_GSO_TCPV4_ECN 2 // GSO frame, IPv4 TCP w/ ECN | ||
29 | #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) | ||
30 | #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP | ||
31 | __u8 gso_type; | ||
32 | __u16 gso_size; | ||
33 | __u16 csum_start; | ||
34 | __u16 csum_offset; | ||
35 | }; | ||
36 | #endif /* _LINUX_VIRTIO_NET_H */ | ||