| 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/ethtool.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/virtio.h> |
| 25 | #include <linux/virtio_net.h> |
| 26 | #include <linux/scatterlist.h> |
| 27 | #include <linux/if_vlan.h> |
| 28 | |
| 29 | static int napi_weight = 128; |
| 30 | module_param(napi_weight, int, 0444); |
| 31 | |
| 32 | static int csum = 1, gso = 1; |
| 33 | module_param(csum, bool, 0444); |
| 34 | module_param(gso, bool, 0444); |
| 35 | |
| 36 | /* FIXME: MTU in config. */ |
| 37 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
| 38 | #define GOOD_COPY_LEN 128 |
| 39 | |
| 40 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
| 41 | |
| 42 | struct virtnet_info |
| 43 | { |
| 44 | struct virtio_device *vdev; |
| 45 | struct virtqueue *rvq, *svq, *cvq; |
| 46 | struct net_device *dev; |
| 47 | struct napi_struct napi; |
| 48 | unsigned int status; |
| 49 | |
| 50 | /* The skb we couldn't send because buffers were full. */ |
| 51 | struct sk_buff *last_xmit_skb; |
| 52 | |
| 53 | /* If we need to free in a timer, this is it. */ |
| 54 | struct timer_list xmit_free_timer; |
| 55 | |
| 56 | /* Number of input buffers, and max we've ever had. */ |
| 57 | unsigned int num, max; |
| 58 | |
| 59 | /* For cleaning up after transmission. */ |
| 60 | struct tasklet_struct tasklet; |
| 61 | bool free_in_tasklet; |
| 62 | |
| 63 | /* I like... big packets and I cannot lie! */ |
| 64 | bool big_packets; |
| 65 | |
| 66 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
| 67 | bool mergeable_rx_bufs; |
| 68 | |
| 69 | /* Receive & send queues. */ |
| 70 | struct sk_buff_head recv; |
| 71 | struct sk_buff_head send; |
| 72 | |
| 73 | /* Work struct for refilling if we run low on memory. */ |
| 74 | struct delayed_work refill; |
| 75 | |
| 76 | /* Chain pages by the private ptr. */ |
| 77 | struct page *pages; |
| 78 | }; |
| 79 | |
| 80 | static inline void *skb_vnet_hdr(struct sk_buff *skb) |
| 81 | { |
| 82 | return (struct virtio_net_hdr *)skb->cb; |
| 83 | } |
| 84 | |
| 85 | static void give_a_page(struct virtnet_info *vi, struct page *page) |
| 86 | { |
| 87 | page->private = (unsigned long)vi->pages; |
| 88 | vi->pages = page; |
| 89 | } |
| 90 | |
| 91 | static void trim_pages(struct virtnet_info *vi, struct sk_buff *skb) |
| 92 | { |
| 93 | unsigned int i; |
| 94 | |
| 95 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) |
| 96 | give_a_page(vi, skb_shinfo(skb)->frags[i].page); |
| 97 | skb_shinfo(skb)->nr_frags = 0; |
| 98 | skb->data_len = 0; |
| 99 | } |
| 100 | |
| 101 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
| 102 | { |
| 103 | struct page *p = vi->pages; |
| 104 | |
| 105 | if (p) |
| 106 | vi->pages = (struct page *)p->private; |
| 107 | else |
| 108 | p = alloc_page(gfp_mask); |
| 109 | return p; |
| 110 | } |
| 111 | |
| 112 | static void skb_xmit_done(struct virtqueue *svq) |
| 113 | { |
| 114 | struct virtnet_info *vi = svq->vdev->priv; |
| 115 | |
| 116 | /* Suppress further interrupts. */ |
| 117 | svq->vq_ops->disable_cb(svq); |
| 118 | |
| 119 | /* We were probably waiting for more output buffers. */ |
| 120 | netif_wake_queue(vi->dev); |
| 121 | |
| 122 | /* Make sure we re-xmit last_xmit_skb: if there are no more packets |
| 123 | * queued, start_xmit won't be called. */ |
| 124 | tasklet_schedule(&vi->tasklet); |
| 125 | } |
| 126 | |
| 127 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, |
| 128 | unsigned len) |
| 129 | { |
| 130 | struct virtnet_info *vi = netdev_priv(dev); |
| 131 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); |
| 132 | int err; |
| 133 | int i; |
| 134 | |
| 135 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
| 136 | pr_debug("%s: short packet %i\n", dev->name, len); |
| 137 | dev->stats.rx_length_errors++; |
| 138 | goto drop; |
| 139 | } |
| 140 | |
| 141 | if (vi->mergeable_rx_bufs) { |
| 142 | struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); |
| 143 | unsigned int copy; |
| 144 | char *p = page_address(skb_shinfo(skb)->frags[0].page); |
| 145 | |
| 146 | if (len > PAGE_SIZE) |
| 147 | len = PAGE_SIZE; |
| 148 | len -= sizeof(struct virtio_net_hdr_mrg_rxbuf); |
| 149 | |
| 150 | memcpy(hdr, p, sizeof(*mhdr)); |
| 151 | p += sizeof(*mhdr); |
| 152 | |
| 153 | copy = len; |
| 154 | if (copy > skb_tailroom(skb)) |
| 155 | copy = skb_tailroom(skb); |
| 156 | |
| 157 | memcpy(skb_put(skb, copy), p, copy); |
| 158 | |
| 159 | len -= copy; |
| 160 | |
| 161 | if (!len) { |
| 162 | give_a_page(vi, skb_shinfo(skb)->frags[0].page); |
| 163 | skb_shinfo(skb)->nr_frags--; |
| 164 | } else { |
| 165 | skb_shinfo(skb)->frags[0].page_offset += |
| 166 | sizeof(*mhdr) + copy; |
| 167 | skb_shinfo(skb)->frags[0].size = len; |
| 168 | skb->data_len += len; |
| 169 | skb->len += len; |
| 170 | } |
| 171 | |
| 172 | while (--mhdr->num_buffers) { |
| 173 | struct sk_buff *nskb; |
| 174 | |
| 175 | i = skb_shinfo(skb)->nr_frags; |
| 176 | if (i >= MAX_SKB_FRAGS) { |
| 177 | pr_debug("%s: packet too long %d\n", dev->name, |
| 178 | len); |
| 179 | dev->stats.rx_length_errors++; |
| 180 | goto drop; |
| 181 | } |
| 182 | |
| 183 | nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len); |
| 184 | if (!nskb) { |
| 185 | pr_debug("%s: rx error: %d buffers missing\n", |
| 186 | dev->name, mhdr->num_buffers); |
| 187 | dev->stats.rx_length_errors++; |
| 188 | goto drop; |
| 189 | } |
| 190 | |
| 191 | __skb_unlink(nskb, &vi->recv); |
| 192 | vi->num--; |
| 193 | |
| 194 | skb_shinfo(skb)->frags[i] = skb_shinfo(nskb)->frags[0]; |
| 195 | skb_shinfo(nskb)->nr_frags = 0; |
| 196 | kfree_skb(nskb); |
| 197 | |
| 198 | if (len > PAGE_SIZE) |
| 199 | len = PAGE_SIZE; |
| 200 | |
| 201 | skb_shinfo(skb)->frags[i].size = len; |
| 202 | skb_shinfo(skb)->nr_frags++; |
| 203 | skb->data_len += len; |
| 204 | skb->len += len; |
| 205 | } |
| 206 | } else { |
| 207 | len -= sizeof(struct virtio_net_hdr); |
| 208 | |
| 209 | if (len <= MAX_PACKET_LEN) |
| 210 | trim_pages(vi, skb); |
| 211 | |
| 212 | err = pskb_trim(skb, len); |
| 213 | if (err) { |
| 214 | pr_debug("%s: pskb_trim failed %i %d\n", dev->name, |
| 215 | len, err); |
| 216 | dev->stats.rx_dropped++; |
| 217 | goto drop; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | skb->truesize += skb->data_len; |
| 222 | dev->stats.rx_bytes += skb->len; |
| 223 | dev->stats.rx_packets++; |
| 224 | |
| 225 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 226 | pr_debug("Needs csum!\n"); |
| 227 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
| 228 | goto frame_err; |
| 229 | } |
| 230 | |
| 231 | skb->protocol = eth_type_trans(skb, dev); |
| 232 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", |
| 233 | ntohs(skb->protocol), skb->len, skb->pkt_type); |
| 234 | |
| 235 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 236 | pr_debug("GSO!\n"); |
| 237 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 238 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 239 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 240 | break; |
| 241 | case VIRTIO_NET_HDR_GSO_UDP: |
| 242 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
| 243 | break; |
| 244 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 245 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 246 | break; |
| 247 | default: |
| 248 | if (net_ratelimit()) |
| 249 | printk(KERN_WARNING "%s: bad gso type %u.\n", |
| 250 | dev->name, hdr->gso_type); |
| 251 | goto frame_err; |
| 252 | } |
| 253 | |
| 254 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 255 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
| 256 | |
| 257 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
| 258 | if (skb_shinfo(skb)->gso_size == 0) { |
| 259 | if (net_ratelimit()) |
| 260 | printk(KERN_WARNING "%s: zero gso size.\n", |
| 261 | dev->name); |
| 262 | goto frame_err; |
| 263 | } |
| 264 | |
| 265 | /* Header must be checked, and gso_segs computed. */ |
| 266 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 267 | skb_shinfo(skb)->gso_segs = 0; |
| 268 | } |
| 269 | |
| 270 | netif_receive_skb(skb); |
| 271 | return; |
| 272 | |
| 273 | frame_err: |
| 274 | dev->stats.rx_frame_errors++; |
| 275 | drop: |
| 276 | dev_kfree_skb(skb); |
| 277 | } |
| 278 | |
| 279 | static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp) |
| 280 | { |
| 281 | struct sk_buff *skb; |
| 282 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
| 283 | int num, err, i; |
| 284 | bool oom = false; |
| 285 | |
| 286 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
| 287 | for (;;) { |
| 288 | struct virtio_net_hdr *hdr; |
| 289 | |
| 290 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN + NET_IP_ALIGN); |
| 291 | if (unlikely(!skb)) { |
| 292 | oom = true; |
| 293 | break; |
| 294 | } |
| 295 | |
| 296 | skb_reserve(skb, NET_IP_ALIGN); |
| 297 | skb_put(skb, MAX_PACKET_LEN); |
| 298 | |
| 299 | hdr = skb_vnet_hdr(skb); |
| 300 | sg_set_buf(sg, hdr, sizeof(*hdr)); |
| 301 | |
| 302 | if (vi->big_packets) { |
| 303 | for (i = 0; i < MAX_SKB_FRAGS; i++) { |
| 304 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; |
| 305 | f->page = get_a_page(vi, gfp); |
| 306 | if (!f->page) |
| 307 | break; |
| 308 | |
| 309 | f->page_offset = 0; |
| 310 | f->size = PAGE_SIZE; |
| 311 | |
| 312 | skb->data_len += PAGE_SIZE; |
| 313 | skb->len += PAGE_SIZE; |
| 314 | |
| 315 | skb_shinfo(skb)->nr_frags++; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
| 320 | skb_queue_head(&vi->recv, skb); |
| 321 | |
| 322 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); |
| 323 | if (err) { |
| 324 | skb_unlink(skb, &vi->recv); |
| 325 | trim_pages(vi, skb); |
| 326 | kfree_skb(skb); |
| 327 | break; |
| 328 | } |
| 329 | vi->num++; |
| 330 | } |
| 331 | if (unlikely(vi->num > vi->max)) |
| 332 | vi->max = vi->num; |
| 333 | vi->rvq->vq_ops->kick(vi->rvq); |
| 334 | return !oom; |
| 335 | } |
| 336 | |
| 337 | /* Returns false if we couldn't fill entirely (OOM). */ |
| 338 | static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) |
| 339 | { |
| 340 | struct sk_buff *skb; |
| 341 | struct scatterlist sg[1]; |
| 342 | int err; |
| 343 | bool oom = false; |
| 344 | |
| 345 | if (!vi->mergeable_rx_bufs) |
| 346 | return try_fill_recv_maxbufs(vi, gfp); |
| 347 | |
| 348 | for (;;) { |
| 349 | skb_frag_t *f; |
| 350 | |
| 351 | skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN); |
| 352 | if (unlikely(!skb)) { |
| 353 | oom = true; |
| 354 | break; |
| 355 | } |
| 356 | |
| 357 | skb_reserve(skb, NET_IP_ALIGN); |
| 358 | |
| 359 | f = &skb_shinfo(skb)->frags[0]; |
| 360 | f->page = get_a_page(vi, gfp); |
| 361 | if (!f->page) { |
| 362 | oom = true; |
| 363 | kfree_skb(skb); |
| 364 | break; |
| 365 | } |
| 366 | |
| 367 | f->page_offset = 0; |
| 368 | f->size = PAGE_SIZE; |
| 369 | |
| 370 | skb_shinfo(skb)->nr_frags++; |
| 371 | |
| 372 | sg_init_one(sg, page_address(f->page), PAGE_SIZE); |
| 373 | skb_queue_head(&vi->recv, skb); |
| 374 | |
| 375 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb); |
| 376 | if (err) { |
| 377 | skb_unlink(skb, &vi->recv); |
| 378 | kfree_skb(skb); |
| 379 | break; |
| 380 | } |
| 381 | vi->num++; |
| 382 | } |
| 383 | if (unlikely(vi->num > vi->max)) |
| 384 | vi->max = vi->num; |
| 385 | vi->rvq->vq_ops->kick(vi->rvq); |
| 386 | return !oom; |
| 387 | } |
| 388 | |
| 389 | static void skb_recv_done(struct virtqueue *rvq) |
| 390 | { |
| 391 | struct virtnet_info *vi = rvq->vdev->priv; |
| 392 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
| 393 | if (napi_schedule_prep(&vi->napi)) { |
| 394 | rvq->vq_ops->disable_cb(rvq); |
| 395 | __napi_schedule(&vi->napi); |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | static void refill_work(struct work_struct *work) |
| 400 | { |
| 401 | struct virtnet_info *vi; |
| 402 | bool still_empty; |
| 403 | |
| 404 | vi = container_of(work, struct virtnet_info, refill.work); |
| 405 | napi_disable(&vi->napi); |
| 406 | try_fill_recv(vi, GFP_KERNEL); |
| 407 | still_empty = (vi->num == 0); |
| 408 | napi_enable(&vi->napi); |
| 409 | |
| 410 | /* In theory, this can happen: if we don't get any buffers in |
| 411 | * we will *never* try to fill again. */ |
| 412 | if (still_empty) |
| 413 | schedule_delayed_work(&vi->refill, HZ/2); |
| 414 | } |
| 415 | |
| 416 | static int virtnet_poll(struct napi_struct *napi, int budget) |
| 417 | { |
| 418 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); |
| 419 | struct sk_buff *skb = NULL; |
| 420 | unsigned int len, received = 0; |
| 421 | |
| 422 | again: |
| 423 | while (received < budget && |
| 424 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { |
| 425 | __skb_unlink(skb, &vi->recv); |
| 426 | receive_skb(vi->dev, skb, len); |
| 427 | vi->num--; |
| 428 | received++; |
| 429 | } |
| 430 | |
| 431 | if (vi->num < vi->max / 2) { |
| 432 | if (!try_fill_recv(vi, GFP_ATOMIC)) |
| 433 | schedule_delayed_work(&vi->refill, 0); |
| 434 | } |
| 435 | |
| 436 | /* Out of packets? */ |
| 437 | if (received < budget) { |
| 438 | napi_complete(napi); |
| 439 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
| 440 | && napi_schedule_prep(napi)) { |
| 441 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
| 442 | __napi_schedule(napi); |
| 443 | goto again; |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | return received; |
| 448 | } |
| 449 | |
| 450 | static void free_old_xmit_skbs(struct virtnet_info *vi) |
| 451 | { |
| 452 | struct sk_buff *skb; |
| 453 | unsigned int len; |
| 454 | |
| 455 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { |
| 456 | pr_debug("Sent skb %p\n", skb); |
| 457 | __skb_unlink(skb, &vi->send); |
| 458 | vi->dev->stats.tx_bytes += skb->len; |
| 459 | vi->dev->stats.tx_packets++; |
| 460 | kfree_skb(skb); |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | /* If the virtio transport doesn't always notify us when all in-flight packets |
| 465 | * are consumed, we fall back to using this function on a timer to free them. */ |
| 466 | static void xmit_free(unsigned long data) |
| 467 | { |
| 468 | struct virtnet_info *vi = (void *)data; |
| 469 | |
| 470 | netif_tx_lock(vi->dev); |
| 471 | |
| 472 | free_old_xmit_skbs(vi); |
| 473 | |
| 474 | if (!skb_queue_empty(&vi->send)) |
| 475 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
| 476 | |
| 477 | netif_tx_unlock(vi->dev); |
| 478 | } |
| 479 | |
| 480 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
| 481 | { |
| 482 | int num, err; |
| 483 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
| 484 | struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); |
| 485 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); |
| 486 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
| 487 | |
| 488 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
| 489 | |
| 490 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
| 491 | |
| 492 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 493 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 494 | hdr->csum_start = skb->csum_start - skb_headroom(skb); |
| 495 | hdr->csum_offset = skb->csum_offset; |
| 496 | } else { |
| 497 | hdr->flags = 0; |
| 498 | hdr->csum_offset = hdr->csum_start = 0; |
| 499 | } |
| 500 | |
| 501 | if (skb_is_gso(skb)) { |
| 502 | hdr->hdr_len = skb_headlen(skb); |
| 503 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
| 504 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
| 505 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 506 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
| 507 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| 508 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
| 509 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; |
| 510 | else |
| 511 | BUG(); |
| 512 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
| 513 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 514 | } else { |
| 515 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 516 | hdr->gso_size = hdr->hdr_len = 0; |
| 517 | } |
| 518 | |
| 519 | mhdr->num_buffers = 0; |
| 520 | |
| 521 | /* Encode metadata header at front. */ |
| 522 | if (vi->mergeable_rx_bufs) |
| 523 | sg_set_buf(sg, mhdr, sizeof(*mhdr)); |
| 524 | else |
| 525 | sg_set_buf(sg, hdr, sizeof(*hdr)); |
| 526 | |
| 527 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
| 528 | |
| 529 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); |
| 530 | if (!err && !vi->free_in_tasklet) |
| 531 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
| 532 | |
| 533 | return err; |
| 534 | } |
| 535 | |
| 536 | static void xmit_tasklet(unsigned long data) |
| 537 | { |
| 538 | struct virtnet_info *vi = (void *)data; |
| 539 | |
| 540 | netif_tx_lock_bh(vi->dev); |
| 541 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { |
| 542 | vi->svq->vq_ops->kick(vi->svq); |
| 543 | vi->last_xmit_skb = NULL; |
| 544 | } |
| 545 | if (vi->free_in_tasklet) |
| 546 | free_old_xmit_skbs(vi); |
| 547 | netif_tx_unlock_bh(vi->dev); |
| 548 | } |
| 549 | |
| 550 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 551 | { |
| 552 | struct virtnet_info *vi = netdev_priv(dev); |
| 553 | |
| 554 | again: |
| 555 | /* Free up any pending old buffers before queueing new ones. */ |
| 556 | free_old_xmit_skbs(vi); |
| 557 | |
| 558 | /* If we has a buffer left over from last time, send it now. */ |
| 559 | if (unlikely(vi->last_xmit_skb) && |
| 560 | xmit_skb(vi, vi->last_xmit_skb) != 0) |
| 561 | goto stop_queue; |
| 562 | |
| 563 | vi->last_xmit_skb = NULL; |
| 564 | |
| 565 | /* Put new one in send queue and do transmit */ |
| 566 | if (likely(skb)) { |
| 567 | __skb_queue_head(&vi->send, skb); |
| 568 | if (xmit_skb(vi, skb) != 0) { |
| 569 | vi->last_xmit_skb = skb; |
| 570 | skb = NULL; |
| 571 | goto stop_queue; |
| 572 | } |
| 573 | } |
| 574 | done: |
| 575 | vi->svq->vq_ops->kick(vi->svq); |
| 576 | return NETDEV_TX_OK; |
| 577 | |
| 578 | stop_queue: |
| 579 | pr_debug("%s: virtio not prepared to send\n", dev->name); |
| 580 | netif_stop_queue(dev); |
| 581 | |
| 582 | /* Activate callback for using skbs: if this returns false it |
| 583 | * means some were used in the meantime. */ |
| 584 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { |
| 585 | vi->svq->vq_ops->disable_cb(vi->svq); |
| 586 | netif_start_queue(dev); |
| 587 | goto again; |
| 588 | } |
| 589 | if (skb) { |
| 590 | /* Drop this skb: we only queue one. */ |
| 591 | vi->dev->stats.tx_dropped++; |
| 592 | kfree_skb(skb); |
| 593 | } |
| 594 | goto done; |
| 595 | } |
| 596 | |
| 597 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
| 598 | { |
| 599 | struct virtnet_info *vi = netdev_priv(dev); |
| 600 | struct virtio_device *vdev = vi->vdev; |
| 601 | int ret; |
| 602 | |
| 603 | ret = eth_mac_addr(dev, p); |
| 604 | if (ret) |
| 605 | return ret; |
| 606 | |
| 607 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
| 608 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), |
| 609 | dev->dev_addr, dev->addr_len); |
| 610 | |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 615 | static void virtnet_netpoll(struct net_device *dev) |
| 616 | { |
| 617 | struct virtnet_info *vi = netdev_priv(dev); |
| 618 | |
| 619 | napi_schedule(&vi->napi); |
| 620 | } |
| 621 | #endif |
| 622 | |
| 623 | static int virtnet_open(struct net_device *dev) |
| 624 | { |
| 625 | struct virtnet_info *vi = netdev_priv(dev); |
| 626 | |
| 627 | napi_enable(&vi->napi); |
| 628 | |
| 629 | /* If all buffers were filled by other side before we napi_enabled, we |
| 630 | * won't get another interrupt, so process any outstanding packets |
| 631 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
| 632 | * We synchronize against interrupts via NAPI_STATE_SCHED */ |
| 633 | if (napi_schedule_prep(&vi->napi)) { |
| 634 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
| 635 | __napi_schedule(&vi->napi); |
| 636 | } |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * Send command via the control virtqueue and check status. Commands |
| 642 | * supported by the hypervisor, as indicated by feature bits, should |
| 643 | * never fail unless improperly formated. |
| 644 | */ |
| 645 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, |
| 646 | struct scatterlist *data, int out, int in) |
| 647 | { |
| 648 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
| 649 | struct virtio_net_ctrl_hdr ctrl; |
| 650 | virtio_net_ctrl_ack status = ~0; |
| 651 | unsigned int tmp; |
| 652 | int i; |
| 653 | |
| 654 | /* Caller should know better */ |
| 655 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || |
| 656 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); |
| 657 | |
| 658 | out++; /* Add header */ |
| 659 | in++; /* Add return status */ |
| 660 | |
| 661 | ctrl.class = class; |
| 662 | ctrl.cmd = cmd; |
| 663 | |
| 664 | sg_init_table(sg, out + in); |
| 665 | |
| 666 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); |
| 667 | for_each_sg(data, s, out + in - 2, i) |
| 668 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); |
| 669 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
| 670 | |
| 671 | BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi)); |
| 672 | |
| 673 | vi->cvq->vq_ops->kick(vi->cvq); |
| 674 | |
| 675 | /* |
| 676 | * Spin for a response, the kick causes an ioport write, trapping |
| 677 | * into the hypervisor, so the request should be handled immediately. |
| 678 | */ |
| 679 | while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp)) |
| 680 | cpu_relax(); |
| 681 | |
| 682 | return status == VIRTIO_NET_OK; |
| 683 | } |
| 684 | |
| 685 | static int virtnet_close(struct net_device *dev) |
| 686 | { |
| 687 | struct virtnet_info *vi = netdev_priv(dev); |
| 688 | |
| 689 | napi_disable(&vi->napi); |
| 690 | |
| 691 | return 0; |
| 692 | } |
| 693 | |
| 694 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
| 695 | { |
| 696 | struct virtnet_info *vi = netdev_priv(dev); |
| 697 | struct virtio_device *vdev = vi->vdev; |
| 698 | |
| 699 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) |
| 700 | return -ENOSYS; |
| 701 | |
| 702 | return ethtool_op_set_tx_hw_csum(dev, data); |
| 703 | } |
| 704 | |
| 705 | static void virtnet_set_rx_mode(struct net_device *dev) |
| 706 | { |
| 707 | struct virtnet_info *vi = netdev_priv(dev); |
| 708 | struct scatterlist sg[2]; |
| 709 | u8 promisc, allmulti; |
| 710 | struct virtio_net_ctrl_mac *mac_data; |
| 711 | struct dev_addr_list *addr; |
| 712 | struct netdev_hw_addr *ha; |
| 713 | void *buf; |
| 714 | int i; |
| 715 | |
| 716 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ |
| 717 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
| 718 | return; |
| 719 | |
| 720 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
| 721 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); |
| 722 | |
| 723 | sg_init_one(sg, &promisc, sizeof(promisc)); |
| 724 | |
| 725 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, |
| 726 | VIRTIO_NET_CTRL_RX_PROMISC, |
| 727 | sg, 1, 0)) |
| 728 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
| 729 | promisc ? "en" : "dis"); |
| 730 | |
| 731 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
| 732 | |
| 733 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, |
| 734 | VIRTIO_NET_CTRL_RX_ALLMULTI, |
| 735 | sg, 1, 0)) |
| 736 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
| 737 | allmulti ? "en" : "dis"); |
| 738 | |
| 739 | /* MAC filter - use one buffer for both lists */ |
| 740 | mac_data = buf = kzalloc(((dev->uc.count + dev->mc_count) * ETH_ALEN) + |
| 741 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); |
| 742 | if (!buf) { |
| 743 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); |
| 744 | return; |
| 745 | } |
| 746 | |
| 747 | sg_init_table(sg, 2); |
| 748 | |
| 749 | /* Store the unicast list and count in the front of the buffer */ |
| 750 | mac_data->entries = dev->uc.count; |
| 751 | i = 0; |
| 752 | list_for_each_entry(ha, &dev->uc.list, list) |
| 753 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
| 754 | |
| 755 | sg_set_buf(&sg[0], mac_data, |
| 756 | sizeof(mac_data->entries) + (dev->uc.count * ETH_ALEN)); |
| 757 | |
| 758 | /* multicast list and count fill the end */ |
| 759 | mac_data = (void *)&mac_data->macs[dev->uc.count][0]; |
| 760 | |
| 761 | mac_data->entries = dev->mc_count; |
| 762 | addr = dev->mc_list; |
| 763 | for (i = 0; i < dev->mc_count; i++, addr = addr->next) |
| 764 | memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); |
| 765 | |
| 766 | sg_set_buf(&sg[1], mac_data, |
| 767 | sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN)); |
| 768 | |
| 769 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, |
| 770 | VIRTIO_NET_CTRL_MAC_TABLE_SET, |
| 771 | sg, 2, 0)) |
| 772 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); |
| 773 | |
| 774 | kfree(buf); |
| 775 | } |
| 776 | |
| 777 | static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
| 778 | { |
| 779 | struct virtnet_info *vi = netdev_priv(dev); |
| 780 | struct scatterlist sg; |
| 781 | |
| 782 | sg_init_one(&sg, &vid, sizeof(vid)); |
| 783 | |
| 784 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, |
| 785 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) |
| 786 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
| 787 | } |
| 788 | |
| 789 | static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
| 790 | { |
| 791 | struct virtnet_info *vi = netdev_priv(dev); |
| 792 | struct scatterlist sg; |
| 793 | |
| 794 | sg_init_one(&sg, &vid, sizeof(vid)); |
| 795 | |
| 796 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, |
| 797 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) |
| 798 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
| 799 | } |
| 800 | |
| 801 | static const struct ethtool_ops virtnet_ethtool_ops = { |
| 802 | .set_tx_csum = virtnet_set_tx_csum, |
| 803 | .set_sg = ethtool_op_set_sg, |
| 804 | .set_tso = ethtool_op_set_tso, |
| 805 | .set_ufo = ethtool_op_set_ufo, |
| 806 | .get_link = ethtool_op_get_link, |
| 807 | }; |
| 808 | |
| 809 | #define MIN_MTU 68 |
| 810 | #define MAX_MTU 65535 |
| 811 | |
| 812 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) |
| 813 | { |
| 814 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) |
| 815 | return -EINVAL; |
| 816 | dev->mtu = new_mtu; |
| 817 | return 0; |
| 818 | } |
| 819 | |
| 820 | static const struct net_device_ops virtnet_netdev = { |
| 821 | .ndo_open = virtnet_open, |
| 822 | .ndo_stop = virtnet_close, |
| 823 | .ndo_start_xmit = start_xmit, |
| 824 | .ndo_validate_addr = eth_validate_addr, |
| 825 | .ndo_set_mac_address = virtnet_set_mac_address, |
| 826 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
| 827 | .ndo_change_mtu = virtnet_change_mtu, |
| 828 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
| 829 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, |
| 830 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 831 | .ndo_poll_controller = virtnet_netpoll, |
| 832 | #endif |
| 833 | }; |
| 834 | |
| 835 | static void virtnet_update_status(struct virtnet_info *vi) |
| 836 | { |
| 837 | u16 v; |
| 838 | |
| 839 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) |
| 840 | return; |
| 841 | |
| 842 | vi->vdev->config->get(vi->vdev, |
| 843 | offsetof(struct virtio_net_config, status), |
| 844 | &v, sizeof(v)); |
| 845 | |
| 846 | /* Ignore unknown (future) status bits */ |
| 847 | v &= VIRTIO_NET_S_LINK_UP; |
| 848 | |
| 849 | if (vi->status == v) |
| 850 | return; |
| 851 | |
| 852 | vi->status = v; |
| 853 | |
| 854 | if (vi->status & VIRTIO_NET_S_LINK_UP) { |
| 855 | netif_carrier_on(vi->dev); |
| 856 | netif_wake_queue(vi->dev); |
| 857 | } else { |
| 858 | netif_carrier_off(vi->dev); |
| 859 | netif_stop_queue(vi->dev); |
| 860 | } |
| 861 | } |
| 862 | |
| 863 | static void virtnet_config_changed(struct virtio_device *vdev) |
| 864 | { |
| 865 | struct virtnet_info *vi = vdev->priv; |
| 866 | |
| 867 | virtnet_update_status(vi); |
| 868 | } |
| 869 | |
| 870 | static int virtnet_probe(struct virtio_device *vdev) |
| 871 | { |
| 872 | int err; |
| 873 | struct net_device *dev; |
| 874 | struct virtnet_info *vi; |
| 875 | struct virtqueue *vqs[3]; |
| 876 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; |
| 877 | const char *names[] = { "input", "output", "control" }; |
| 878 | int nvqs; |
| 879 | |
| 880 | /* Allocate ourselves a network device with room for our info */ |
| 881 | dev = alloc_etherdev(sizeof(struct virtnet_info)); |
| 882 | if (!dev) |
| 883 | return -ENOMEM; |
| 884 | |
| 885 | /* Set up network device as normal. */ |
| 886 | dev->netdev_ops = &virtnet_netdev; |
| 887 | dev->features = NETIF_F_HIGHDMA; |
| 888 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
| 889 | SET_NETDEV_DEV(dev, &vdev->dev); |
| 890 | |
| 891 | /* Do we support "hardware" checksums? */ |
| 892 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
| 893 | /* This opens up the world of extra features. */ |
| 894 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
| 895 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
| 896 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
| 897 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
| 898 | } |
| 899 | /* Individual feature bits: what can host handle? */ |
| 900 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
| 901 | dev->features |= NETIF_F_TSO; |
| 902 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
| 903 | dev->features |= NETIF_F_TSO6; |
| 904 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
| 905 | dev->features |= NETIF_F_TSO_ECN; |
| 906 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
| 907 | dev->features |= NETIF_F_UFO; |
| 908 | } |
| 909 | |
| 910 | /* Configuration may specify what MAC to use. Otherwise random. */ |
| 911 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
| 912 | vdev->config->get(vdev, |
| 913 | offsetof(struct virtio_net_config, mac), |
| 914 | dev->dev_addr, dev->addr_len); |
| 915 | } else |
| 916 | random_ether_addr(dev->dev_addr); |
| 917 | |
| 918 | /* Set up our device-specific information */ |
| 919 | vi = netdev_priv(dev); |
| 920 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
| 921 | vi->dev = dev; |
| 922 | vi->vdev = vdev; |
| 923 | vdev->priv = vi; |
| 924 | vi->pages = NULL; |
| 925 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
| 926 | |
| 927 | /* If they give us a callback when all buffers are done, we don't need |
| 928 | * the timer. */ |
| 929 | vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); |
| 930 | |
| 931 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
| 932 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) |
| 933 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) |
| 934 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) |
| 935 | vi->big_packets = true; |
| 936 | |
| 937 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
| 938 | vi->mergeable_rx_bufs = true; |
| 939 | |
| 940 | /* We expect two virtqueues, receive then send, |
| 941 | * and optionally control. */ |
| 942 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; |
| 943 | |
| 944 | err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names); |
| 945 | if (err) |
| 946 | goto free; |
| 947 | |
| 948 | vi->rvq = vqs[0]; |
| 949 | vi->svq = vqs[1]; |
| 950 | |
| 951 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { |
| 952 | vi->cvq = vqs[2]; |
| 953 | |
| 954 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
| 955 | dev->features |= NETIF_F_HW_VLAN_FILTER; |
| 956 | } |
| 957 | |
| 958 | /* Initialize our empty receive and send queues. */ |
| 959 | skb_queue_head_init(&vi->recv); |
| 960 | skb_queue_head_init(&vi->send); |
| 961 | |
| 962 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
| 963 | |
| 964 | if (!vi->free_in_tasklet) |
| 965 | setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); |
| 966 | |
| 967 | err = register_netdev(dev); |
| 968 | if (err) { |
| 969 | pr_debug("virtio_net: registering device failed\n"); |
| 970 | goto free_vqs; |
| 971 | } |
| 972 | |
| 973 | /* Last of all, set up some receive buffers. */ |
| 974 | try_fill_recv(vi, GFP_KERNEL); |
| 975 | |
| 976 | /* If we didn't even get one input buffer, we're useless. */ |
| 977 | if (vi->num == 0) { |
| 978 | err = -ENOMEM; |
| 979 | goto unregister; |
| 980 | } |
| 981 | |
| 982 | vi->status = VIRTIO_NET_S_LINK_UP; |
| 983 | virtnet_update_status(vi); |
| 984 | netif_carrier_on(dev); |
| 985 | |
| 986 | pr_debug("virtnet: registered device %s\n", dev->name); |
| 987 | return 0; |
| 988 | |
| 989 | unregister: |
| 990 | unregister_netdev(dev); |
| 991 | cancel_delayed_work_sync(&vi->refill); |
| 992 | free_vqs: |
| 993 | vdev->config->del_vqs(vdev); |
| 994 | free: |
| 995 | free_netdev(dev); |
| 996 | return err; |
| 997 | } |
| 998 | |
| 999 | static void virtnet_remove(struct virtio_device *vdev) |
| 1000 | { |
| 1001 | struct virtnet_info *vi = vdev->priv; |
| 1002 | struct sk_buff *skb; |
| 1003 | |
| 1004 | /* Stop all the virtqueues. */ |
| 1005 | vdev->config->reset(vdev); |
| 1006 | |
| 1007 | if (!vi->free_in_tasklet) |
| 1008 | del_timer_sync(&vi->xmit_free_timer); |
| 1009 | |
| 1010 | /* Free our skbs in send and recv queues, if any. */ |
| 1011 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
| 1012 | kfree_skb(skb); |
| 1013 | vi->num--; |
| 1014 | } |
| 1015 | __skb_queue_purge(&vi->send); |
| 1016 | |
| 1017 | BUG_ON(vi->num != 0); |
| 1018 | |
| 1019 | unregister_netdev(vi->dev); |
| 1020 | cancel_delayed_work_sync(&vi->refill); |
| 1021 | |
| 1022 | vdev->config->del_vqs(vi->vdev); |
| 1023 | |
| 1024 | while (vi->pages) |
| 1025 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); |
| 1026 | |
| 1027 | free_netdev(vi->dev); |
| 1028 | } |
| 1029 | |
| 1030 | static struct virtio_device_id id_table[] = { |
| 1031 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, |
| 1032 | { 0 }, |
| 1033 | }; |
| 1034 | |
| 1035 | static unsigned int features[] = { |
| 1036 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
| 1037 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, |
| 1038 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
| 1039 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
| 1040 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
| 1041 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
| 1042 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
| 1043 | VIRTIO_F_NOTIFY_ON_EMPTY, |
| 1044 | }; |
| 1045 | |
| 1046 | static struct virtio_driver virtio_net = { |
| 1047 | .feature_table = features, |
| 1048 | .feature_table_size = ARRAY_SIZE(features), |
| 1049 | .driver.name = KBUILD_MODNAME, |
| 1050 | .driver.owner = THIS_MODULE, |
| 1051 | .id_table = id_table, |
| 1052 | .probe = virtnet_probe, |
| 1053 | .remove = __devexit_p(virtnet_remove), |
| 1054 | .config_changed = virtnet_config_changed, |
| 1055 | }; |
| 1056 | |
| 1057 | static int __init init(void) |
| 1058 | { |
| 1059 | return register_virtio_driver(&virtio_net); |
| 1060 | } |
| 1061 | |
| 1062 | static void __exit fini(void) |
| 1063 | { |
| 1064 | unregister_virtio_driver(&virtio_net); |
| 1065 | } |
| 1066 | module_init(init); |
| 1067 | module_exit(fini); |
| 1068 | |
| 1069 | MODULE_DEVICE_TABLE(virtio, id_table); |
| 1070 | MODULE_DESCRIPTION("Virtio network driver"); |
| 1071 | MODULE_LICENSE("GPL"); |