| 1 | /* A 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, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | //#define DEBUG |
| 19 | #include <linux/netdevice.h> |
| 20 | #include <linux/etherdevice.h> |
| 21 | #include <linux/ethtool.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/virtio.h> |
| 24 | #include <linux/virtio_net.h> |
| 25 | #include <linux/scatterlist.h> |
| 26 | #include <linux/if_vlan.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/cpu.h> |
| 29 | #include <linux/average.h> |
| 30 | #include <net/busy_poll.h> |
| 31 | |
| 32 | static int napi_weight = NAPI_POLL_WEIGHT; |
| 33 | module_param(napi_weight, int, 0444); |
| 34 | |
| 35 | static bool csum = true, gso = true; |
| 36 | module_param(csum, bool, 0444); |
| 37 | module_param(gso, bool, 0444); |
| 38 | |
| 39 | /* FIXME: MTU in config. */ |
| 40 | #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
| 41 | #define GOOD_COPY_LEN 128 |
| 42 | |
| 43 | /* Weight used for the RX packet size EWMA. The average packet size is used to |
| 44 | * determine the packet buffer size when refilling RX rings. As the entire RX |
| 45 | * ring may be refilled at once, the weight is chosen so that the EWMA will be |
| 46 | * insensitive to short-term, transient changes in packet size. |
| 47 | */ |
| 48 | #define RECEIVE_AVG_WEIGHT 64 |
| 49 | |
| 50 | /* Minimum alignment for mergeable packet buffers. */ |
| 51 | #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256) |
| 52 | |
| 53 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
| 54 | |
| 55 | struct virtnet_stats { |
| 56 | struct u64_stats_sync tx_syncp; |
| 57 | struct u64_stats_sync rx_syncp; |
| 58 | u64 tx_bytes; |
| 59 | u64 tx_packets; |
| 60 | |
| 61 | u64 rx_bytes; |
| 62 | u64 rx_packets; |
| 63 | }; |
| 64 | |
| 65 | /* Internal representation of a send virtqueue */ |
| 66 | struct send_queue { |
| 67 | /* Virtqueue associated with this send _queue */ |
| 68 | struct virtqueue *vq; |
| 69 | |
| 70 | /* TX: fragments + linear part + virtio header */ |
| 71 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; |
| 72 | |
| 73 | /* Name of the send queue: output.$index */ |
| 74 | char name[40]; |
| 75 | }; |
| 76 | |
| 77 | /* Internal representation of a receive virtqueue */ |
| 78 | struct receive_queue { |
| 79 | /* Virtqueue associated with this receive_queue */ |
| 80 | struct virtqueue *vq; |
| 81 | |
| 82 | struct napi_struct napi; |
| 83 | |
| 84 | /* Chain pages by the private ptr. */ |
| 85 | struct page *pages; |
| 86 | |
| 87 | /* Average packet length for mergeable receive buffers. */ |
| 88 | struct ewma mrg_avg_pkt_len; |
| 89 | |
| 90 | /* Page frag for packet buffer allocation. */ |
| 91 | struct page_frag alloc_frag; |
| 92 | |
| 93 | /* RX: fragments + linear part + virtio header */ |
| 94 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; |
| 95 | |
| 96 | /* Name of this receive queue: input.$index */ |
| 97 | char name[40]; |
| 98 | }; |
| 99 | |
| 100 | struct virtnet_info { |
| 101 | struct virtio_device *vdev; |
| 102 | struct virtqueue *cvq; |
| 103 | struct net_device *dev; |
| 104 | struct send_queue *sq; |
| 105 | struct receive_queue *rq; |
| 106 | unsigned int status; |
| 107 | |
| 108 | /* Max # of queue pairs supported by the device */ |
| 109 | u16 max_queue_pairs; |
| 110 | |
| 111 | /* # of queue pairs currently used by the driver */ |
| 112 | u16 curr_queue_pairs; |
| 113 | |
| 114 | /* I like... big packets and I cannot lie! */ |
| 115 | bool big_packets; |
| 116 | |
| 117 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
| 118 | bool mergeable_rx_bufs; |
| 119 | |
| 120 | /* Has control virtqueue */ |
| 121 | bool has_cvq; |
| 122 | |
| 123 | /* Host can handle any s/g split between our header and packet data */ |
| 124 | bool any_header_sg; |
| 125 | |
| 126 | /* Packet virtio header size */ |
| 127 | u8 hdr_len; |
| 128 | |
| 129 | /* Active statistics */ |
| 130 | struct virtnet_stats __percpu *stats; |
| 131 | |
| 132 | /* Work struct for refilling if we run low on memory. */ |
| 133 | struct delayed_work refill; |
| 134 | |
| 135 | /* Work struct for config space updates */ |
| 136 | struct work_struct config_work; |
| 137 | |
| 138 | /* Does the affinity hint is set for virtqueues? */ |
| 139 | bool affinity_hint_set; |
| 140 | |
| 141 | /* CPU hot plug notifier */ |
| 142 | struct notifier_block nb; |
| 143 | }; |
| 144 | |
| 145 | struct padded_vnet_hdr { |
| 146 | struct virtio_net_hdr_mrg_rxbuf hdr; |
| 147 | /* |
| 148 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
| 149 | * with this header sg. This padding makes next sg 16 byte aligned |
| 150 | * after the header. |
| 151 | */ |
| 152 | char padding[4]; |
| 153 | }; |
| 154 | |
| 155 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
| 156 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq |
| 157 | */ |
| 158 | static int vq2txq(struct virtqueue *vq) |
| 159 | { |
| 160 | return (vq->index - 1) / 2; |
| 161 | } |
| 162 | |
| 163 | static int txq2vq(int txq) |
| 164 | { |
| 165 | return txq * 2 + 1; |
| 166 | } |
| 167 | |
| 168 | static int vq2rxq(struct virtqueue *vq) |
| 169 | { |
| 170 | return vq->index / 2; |
| 171 | } |
| 172 | |
| 173 | static int rxq2vq(int rxq) |
| 174 | { |
| 175 | return rxq * 2; |
| 176 | } |
| 177 | |
| 178 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
| 179 | { |
| 180 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * private is used to chain pages for big packets, put the whole |
| 185 | * most recent used list in the beginning for reuse |
| 186 | */ |
| 187 | static void give_pages(struct receive_queue *rq, struct page *page) |
| 188 | { |
| 189 | struct page *end; |
| 190 | |
| 191 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
| 192 | for (end = page; end->private; end = (struct page *)end->private); |
| 193 | end->private = (unsigned long)rq->pages; |
| 194 | rq->pages = page; |
| 195 | } |
| 196 | |
| 197 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
| 198 | { |
| 199 | struct page *p = rq->pages; |
| 200 | |
| 201 | if (p) { |
| 202 | rq->pages = (struct page *)p->private; |
| 203 | /* clear private here, it is used to chain pages */ |
| 204 | p->private = 0; |
| 205 | } else |
| 206 | p = alloc_page(gfp_mask); |
| 207 | return p; |
| 208 | } |
| 209 | |
| 210 | static void skb_xmit_done(struct virtqueue *vq) |
| 211 | { |
| 212 | struct virtnet_info *vi = vq->vdev->priv; |
| 213 | |
| 214 | /* Suppress further interrupts. */ |
| 215 | virtqueue_disable_cb(vq); |
| 216 | |
| 217 | /* We were probably waiting for more output buffers. */ |
| 218 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
| 219 | } |
| 220 | |
| 221 | static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) |
| 222 | { |
| 223 | unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); |
| 224 | return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; |
| 225 | } |
| 226 | |
| 227 | static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) |
| 228 | { |
| 229 | return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); |
| 230 | |
| 231 | } |
| 232 | |
| 233 | static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) |
| 234 | { |
| 235 | unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; |
| 236 | return (unsigned long)buf | (size - 1); |
| 237 | } |
| 238 | |
| 239 | /* Called from bottom half context */ |
| 240 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
| 241 | struct receive_queue *rq, |
| 242 | struct page *page, unsigned int offset, |
| 243 | unsigned int len, unsigned int truesize) |
| 244 | { |
| 245 | struct sk_buff *skb; |
| 246 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
| 247 | unsigned int copy, hdr_len, hdr_padded_len; |
| 248 | char *p; |
| 249 | |
| 250 | p = page_address(page) + offset; |
| 251 | |
| 252 | /* copy small packet so we can reuse these pages for small data */ |
| 253 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); |
| 254 | if (unlikely(!skb)) |
| 255 | return NULL; |
| 256 | |
| 257 | hdr = skb_vnet_hdr(skb); |
| 258 | |
| 259 | hdr_len = vi->hdr_len; |
| 260 | if (vi->mergeable_rx_bufs) |
| 261 | hdr_padded_len = sizeof *hdr; |
| 262 | else |
| 263 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
| 264 | |
| 265 | memcpy(hdr, p, hdr_len); |
| 266 | |
| 267 | len -= hdr_len; |
| 268 | offset += hdr_padded_len; |
| 269 | p += hdr_padded_len; |
| 270 | |
| 271 | copy = len; |
| 272 | if (copy > skb_tailroom(skb)) |
| 273 | copy = skb_tailroom(skb); |
| 274 | memcpy(skb_put(skb, copy), p, copy); |
| 275 | |
| 276 | len -= copy; |
| 277 | offset += copy; |
| 278 | |
| 279 | if (vi->mergeable_rx_bufs) { |
| 280 | if (len) |
| 281 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); |
| 282 | else |
| 283 | put_page(page); |
| 284 | return skb; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Verify that we can indeed put this data into a skb. |
| 289 | * This is here to handle cases when the device erroneously |
| 290 | * tries to receive more than is possible. This is usually |
| 291 | * the case of a broken device. |
| 292 | */ |
| 293 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { |
| 294 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
| 295 | dev_kfree_skb(skb); |
| 296 | return NULL; |
| 297 | } |
| 298 | BUG_ON(offset >= PAGE_SIZE); |
| 299 | while (len) { |
| 300 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
| 301 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, |
| 302 | frag_size, truesize); |
| 303 | len -= frag_size; |
| 304 | page = (struct page *)page->private; |
| 305 | offset = 0; |
| 306 | } |
| 307 | |
| 308 | if (page) |
| 309 | give_pages(rq, page); |
| 310 | |
| 311 | return skb; |
| 312 | } |
| 313 | |
| 314 | static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len) |
| 315 | { |
| 316 | struct sk_buff * skb = buf; |
| 317 | |
| 318 | len -= vi->hdr_len; |
| 319 | skb_trim(skb, len); |
| 320 | |
| 321 | return skb; |
| 322 | } |
| 323 | |
| 324 | static struct sk_buff *receive_big(struct net_device *dev, |
| 325 | struct virtnet_info *vi, |
| 326 | struct receive_queue *rq, |
| 327 | void *buf, |
| 328 | unsigned int len) |
| 329 | { |
| 330 | struct page *page = buf; |
| 331 | struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); |
| 332 | |
| 333 | if (unlikely(!skb)) |
| 334 | goto err; |
| 335 | |
| 336 | return skb; |
| 337 | |
| 338 | err: |
| 339 | dev->stats.rx_dropped++; |
| 340 | give_pages(rq, page); |
| 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
| 345 | struct virtnet_info *vi, |
| 346 | struct receive_queue *rq, |
| 347 | unsigned long ctx, |
| 348 | unsigned int len) |
| 349 | { |
| 350 | void *buf = mergeable_ctx_to_buf_address(ctx); |
| 351 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
| 352 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); |
| 353 | struct page *page = virt_to_head_page(buf); |
| 354 | int offset = buf - page_address(page); |
| 355 | unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
| 356 | |
| 357 | struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len, |
| 358 | truesize); |
| 359 | struct sk_buff *curr_skb = head_skb; |
| 360 | |
| 361 | if (unlikely(!curr_skb)) |
| 362 | goto err_skb; |
| 363 | while (--num_buf) { |
| 364 | int num_skb_frags; |
| 365 | |
| 366 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
| 367 | if (unlikely(!ctx)) { |
| 368 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
| 369 | dev->name, num_buf, |
| 370 | virtio16_to_cpu(vi->vdev, |
| 371 | hdr->num_buffers)); |
| 372 | dev->stats.rx_length_errors++; |
| 373 | goto err_buf; |
| 374 | } |
| 375 | |
| 376 | buf = mergeable_ctx_to_buf_address(ctx); |
| 377 | page = virt_to_head_page(buf); |
| 378 | |
| 379 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; |
| 380 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
| 381 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); |
| 382 | |
| 383 | if (unlikely(!nskb)) |
| 384 | goto err_skb; |
| 385 | if (curr_skb == head_skb) |
| 386 | skb_shinfo(curr_skb)->frag_list = nskb; |
| 387 | else |
| 388 | curr_skb->next = nskb; |
| 389 | curr_skb = nskb; |
| 390 | head_skb->truesize += nskb->truesize; |
| 391 | num_skb_frags = 0; |
| 392 | } |
| 393 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
| 394 | if (curr_skb != head_skb) { |
| 395 | head_skb->data_len += len; |
| 396 | head_skb->len += len; |
| 397 | head_skb->truesize += truesize; |
| 398 | } |
| 399 | offset = buf - page_address(page); |
| 400 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
| 401 | put_page(page); |
| 402 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, |
| 403 | len, truesize); |
| 404 | } else { |
| 405 | skb_add_rx_frag(curr_skb, num_skb_frags, page, |
| 406 | offset, len, truesize); |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | ewma_add(&rq->mrg_avg_pkt_len, head_skb->len); |
| 411 | return head_skb; |
| 412 | |
| 413 | err_skb: |
| 414 | put_page(page); |
| 415 | while (--num_buf) { |
| 416 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
| 417 | if (unlikely(!ctx)) { |
| 418 | pr_debug("%s: rx error: %d buffers missing\n", |
| 419 | dev->name, num_buf); |
| 420 | dev->stats.rx_length_errors++; |
| 421 | break; |
| 422 | } |
| 423 | page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); |
| 424 | put_page(page); |
| 425 | } |
| 426 | err_buf: |
| 427 | dev->stats.rx_dropped++; |
| 428 | dev_kfree_skb(head_skb); |
| 429 | return NULL; |
| 430 | } |
| 431 | |
| 432 | static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
| 433 | void *buf, unsigned int len) |
| 434 | { |
| 435 | struct net_device *dev = vi->dev; |
| 436 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
| 437 | struct sk_buff *skb; |
| 438 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
| 439 | |
| 440 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
| 441 | pr_debug("%s: short packet %i\n", dev->name, len); |
| 442 | dev->stats.rx_length_errors++; |
| 443 | if (vi->mergeable_rx_bufs) { |
| 444 | unsigned long ctx = (unsigned long)buf; |
| 445 | void *base = mergeable_ctx_to_buf_address(ctx); |
| 446 | put_page(virt_to_head_page(base)); |
| 447 | } else if (vi->big_packets) { |
| 448 | give_pages(rq, buf); |
| 449 | } else { |
| 450 | dev_kfree_skb(buf); |
| 451 | } |
| 452 | return; |
| 453 | } |
| 454 | |
| 455 | if (vi->mergeable_rx_bufs) |
| 456 | skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len); |
| 457 | else if (vi->big_packets) |
| 458 | skb = receive_big(dev, vi, rq, buf, len); |
| 459 | else |
| 460 | skb = receive_small(vi, buf, len); |
| 461 | |
| 462 | if (unlikely(!skb)) |
| 463 | return; |
| 464 | |
| 465 | hdr = skb_vnet_hdr(skb); |
| 466 | |
| 467 | u64_stats_update_begin(&stats->rx_syncp); |
| 468 | stats->rx_bytes += skb->len; |
| 469 | stats->rx_packets++; |
| 470 | u64_stats_update_end(&stats->rx_syncp); |
| 471 | |
| 472 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 473 | pr_debug("Needs csum!\n"); |
| 474 | if (!skb_partial_csum_set(skb, |
| 475 | virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start), |
| 476 | virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset))) |
| 477 | goto frame_err; |
| 478 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
| 479 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 480 | } |
| 481 | |
| 482 | skb->protocol = eth_type_trans(skb, dev); |
| 483 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", |
| 484 | ntohs(skb->protocol), skb->len, skb->pkt_type); |
| 485 | |
| 486 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 487 | pr_debug("GSO!\n"); |
| 488 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 489 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 490 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 491 | break; |
| 492 | case VIRTIO_NET_HDR_GSO_UDP: |
| 493 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
| 494 | break; |
| 495 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 496 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 497 | break; |
| 498 | default: |
| 499 | net_warn_ratelimited("%s: bad gso type %u.\n", |
| 500 | dev->name, hdr->hdr.gso_type); |
| 501 | goto frame_err; |
| 502 | } |
| 503 | |
| 504 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 505 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
| 506 | |
| 507 | skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev, |
| 508 | hdr->hdr.gso_size); |
| 509 | if (skb_shinfo(skb)->gso_size == 0) { |
| 510 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
| 511 | goto frame_err; |
| 512 | } |
| 513 | |
| 514 | /* Header must be checked, and gso_segs computed. */ |
| 515 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 516 | skb_shinfo(skb)->gso_segs = 0; |
| 517 | } |
| 518 | |
| 519 | skb_mark_napi_id(skb, &rq->napi); |
| 520 | |
| 521 | netif_receive_skb(skb); |
| 522 | return; |
| 523 | |
| 524 | frame_err: |
| 525 | dev->stats.rx_frame_errors++; |
| 526 | dev_kfree_skb(skb); |
| 527 | } |
| 528 | |
| 529 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
| 530 | gfp_t gfp) |
| 531 | { |
| 532 | struct sk_buff *skb; |
| 533 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
| 534 | int err; |
| 535 | |
| 536 | skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); |
| 537 | if (unlikely(!skb)) |
| 538 | return -ENOMEM; |
| 539 | |
| 540 | skb_put(skb, GOOD_PACKET_LEN); |
| 541 | |
| 542 | hdr = skb_vnet_hdr(skb); |
| 543 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
| 544 | sg_set_buf(rq->sg, hdr, vi->hdr_len); |
| 545 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
| 546 | |
| 547 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); |
| 548 | if (err < 0) |
| 549 | dev_kfree_skb(skb); |
| 550 | |
| 551 | return err; |
| 552 | } |
| 553 | |
| 554 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
| 555 | gfp_t gfp) |
| 556 | { |
| 557 | struct page *first, *list = NULL; |
| 558 | char *p; |
| 559 | int i, err, offset; |
| 560 | |
| 561 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
| 562 | |
| 563 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
| 564 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
| 565 | first = get_a_page(rq, gfp); |
| 566 | if (!first) { |
| 567 | if (list) |
| 568 | give_pages(rq, list); |
| 569 | return -ENOMEM; |
| 570 | } |
| 571 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
| 572 | |
| 573 | /* chain new page in list head to match sg */ |
| 574 | first->private = (unsigned long)list; |
| 575 | list = first; |
| 576 | } |
| 577 | |
| 578 | first = get_a_page(rq, gfp); |
| 579 | if (!first) { |
| 580 | give_pages(rq, list); |
| 581 | return -ENOMEM; |
| 582 | } |
| 583 | p = page_address(first); |
| 584 | |
| 585 | /* rq->sg[0], rq->sg[1] share the same page */ |
| 586 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
| 587 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); |
| 588 | |
| 589 | /* rq->sg[1] for data packet, from offset */ |
| 590 | offset = sizeof(struct padded_vnet_hdr); |
| 591 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
| 592 | |
| 593 | /* chain first in list head */ |
| 594 | first->private = (unsigned long)list; |
| 595 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
| 596 | first, gfp); |
| 597 | if (err < 0) |
| 598 | give_pages(rq, first); |
| 599 | |
| 600 | return err; |
| 601 | } |
| 602 | |
| 603 | static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len) |
| 604 | { |
| 605 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
| 606 | unsigned int len; |
| 607 | |
| 608 | len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len), |
| 609 | GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); |
| 610 | return ALIGN(len, MERGEABLE_BUFFER_ALIGN); |
| 611 | } |
| 612 | |
| 613 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) |
| 614 | { |
| 615 | struct page_frag *alloc_frag = &rq->alloc_frag; |
| 616 | char *buf; |
| 617 | unsigned long ctx; |
| 618 | int err; |
| 619 | unsigned int len, hole; |
| 620 | |
| 621 | len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); |
| 622 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) |
| 623 | return -ENOMEM; |
| 624 | |
| 625 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
| 626 | ctx = mergeable_buf_to_ctx(buf, len); |
| 627 | get_page(alloc_frag->page); |
| 628 | alloc_frag->offset += len; |
| 629 | hole = alloc_frag->size - alloc_frag->offset; |
| 630 | if (hole < len) { |
| 631 | /* To avoid internal fragmentation, if there is very likely not |
| 632 | * enough space for another buffer, add the remaining space to |
| 633 | * the current buffer. This extra space is not included in |
| 634 | * the truesize stored in ctx. |
| 635 | */ |
| 636 | len += hole; |
| 637 | alloc_frag->offset += hole; |
| 638 | } |
| 639 | |
| 640 | sg_init_one(rq->sg, buf, len); |
| 641 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); |
| 642 | if (err < 0) |
| 643 | put_page(virt_to_head_page(buf)); |
| 644 | |
| 645 | return err; |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Returns false if we couldn't fill entirely (OOM). |
| 650 | * |
| 651 | * Normally run in the receive path, but can also be run from ndo_open |
| 652 | * before we're receiving packets, or from refill_work which is |
| 653 | * careful to disable receiving (using napi_disable). |
| 654 | */ |
| 655 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
| 656 | gfp_t gfp) |
| 657 | { |
| 658 | int err; |
| 659 | bool oom; |
| 660 | |
| 661 | gfp |= __GFP_COLD; |
| 662 | do { |
| 663 | if (vi->mergeable_rx_bufs) |
| 664 | err = add_recvbuf_mergeable(rq, gfp); |
| 665 | else if (vi->big_packets) |
| 666 | err = add_recvbuf_big(vi, rq, gfp); |
| 667 | else |
| 668 | err = add_recvbuf_small(vi, rq, gfp); |
| 669 | |
| 670 | oom = err == -ENOMEM; |
| 671 | if (err) |
| 672 | break; |
| 673 | } while (rq->vq->num_free); |
| 674 | virtqueue_kick(rq->vq); |
| 675 | return !oom; |
| 676 | } |
| 677 | |
| 678 | static void skb_recv_done(struct virtqueue *rvq) |
| 679 | { |
| 680 | struct virtnet_info *vi = rvq->vdev->priv; |
| 681 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
| 682 | |
| 683 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
| 684 | if (napi_schedule_prep(&rq->napi)) { |
| 685 | virtqueue_disable_cb(rvq); |
| 686 | __napi_schedule(&rq->napi); |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | static void virtnet_napi_enable(struct receive_queue *rq) |
| 691 | { |
| 692 | napi_enable(&rq->napi); |
| 693 | |
| 694 | /* If all buffers were filled by other side before we napi_enabled, we |
| 695 | * won't get another interrupt, so process any outstanding packets |
| 696 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
| 697 | * We synchronize against interrupts via NAPI_STATE_SCHED */ |
| 698 | if (napi_schedule_prep(&rq->napi)) { |
| 699 | virtqueue_disable_cb(rq->vq); |
| 700 | local_bh_disable(); |
| 701 | __napi_schedule(&rq->napi); |
| 702 | local_bh_enable(); |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | static void refill_work(struct work_struct *work) |
| 707 | { |
| 708 | struct virtnet_info *vi = |
| 709 | container_of(work, struct virtnet_info, refill.work); |
| 710 | bool still_empty; |
| 711 | int i; |
| 712 | |
| 713 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
| 714 | struct receive_queue *rq = &vi->rq[i]; |
| 715 | |
| 716 | napi_disable(&rq->napi); |
| 717 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
| 718 | virtnet_napi_enable(rq); |
| 719 | |
| 720 | /* In theory, this can happen: if we don't get any buffers in |
| 721 | * we will *never* try to fill again. |
| 722 | */ |
| 723 | if (still_empty) |
| 724 | schedule_delayed_work(&vi->refill, HZ/2); |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | static int virtnet_receive(struct receive_queue *rq, int budget) |
| 729 | { |
| 730 | struct virtnet_info *vi = rq->vq->vdev->priv; |
| 731 | unsigned int len, received = 0; |
| 732 | void *buf; |
| 733 | |
| 734 | while (received < budget && |
| 735 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
| 736 | receive_buf(vi, rq, buf, len); |
| 737 | received++; |
| 738 | } |
| 739 | |
| 740 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
| 741 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
| 742 | schedule_delayed_work(&vi->refill, 0); |
| 743 | } |
| 744 | |
| 745 | return received; |
| 746 | } |
| 747 | |
| 748 | static int virtnet_poll(struct napi_struct *napi, int budget) |
| 749 | { |
| 750 | struct receive_queue *rq = |
| 751 | container_of(napi, struct receive_queue, napi); |
| 752 | unsigned int r, received; |
| 753 | |
| 754 | received = virtnet_receive(rq, budget); |
| 755 | |
| 756 | /* Out of packets? */ |
| 757 | if (received < budget) { |
| 758 | r = virtqueue_enable_cb_prepare(rq->vq); |
| 759 | napi_complete(napi); |
| 760 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
| 761 | napi_schedule_prep(napi)) { |
| 762 | virtqueue_disable_cb(rq->vq); |
| 763 | __napi_schedule(napi); |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | return received; |
| 768 | } |
| 769 | |
| 770 | #ifdef CONFIG_NET_RX_BUSY_POLL |
| 771 | /* must be called with local_bh_disable()d */ |
| 772 | static int virtnet_busy_poll(struct napi_struct *napi) |
| 773 | { |
| 774 | struct receive_queue *rq = |
| 775 | container_of(napi, struct receive_queue, napi); |
| 776 | struct virtnet_info *vi = rq->vq->vdev->priv; |
| 777 | int r, received = 0, budget = 4; |
| 778 | |
| 779 | if (!(vi->status & VIRTIO_NET_S_LINK_UP)) |
| 780 | return LL_FLUSH_FAILED; |
| 781 | |
| 782 | if (!napi_schedule_prep(napi)) |
| 783 | return LL_FLUSH_BUSY; |
| 784 | |
| 785 | virtqueue_disable_cb(rq->vq); |
| 786 | |
| 787 | again: |
| 788 | received += virtnet_receive(rq, budget); |
| 789 | |
| 790 | r = virtqueue_enable_cb_prepare(rq->vq); |
| 791 | clear_bit(NAPI_STATE_SCHED, &napi->state); |
| 792 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
| 793 | napi_schedule_prep(napi)) { |
| 794 | virtqueue_disable_cb(rq->vq); |
| 795 | if (received < budget) { |
| 796 | budget -= received; |
| 797 | goto again; |
| 798 | } else { |
| 799 | __napi_schedule(napi); |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | return received; |
| 804 | } |
| 805 | #endif /* CONFIG_NET_RX_BUSY_POLL */ |
| 806 | |
| 807 | static int virtnet_open(struct net_device *dev) |
| 808 | { |
| 809 | struct virtnet_info *vi = netdev_priv(dev); |
| 810 | int i; |
| 811 | |
| 812 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 813 | if (i < vi->curr_queue_pairs) |
| 814 | /* Make sure we have some buffers: if oom use wq. */ |
| 815 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
| 816 | schedule_delayed_work(&vi->refill, 0); |
| 817 | virtnet_napi_enable(&vi->rq[i]); |
| 818 | } |
| 819 | |
| 820 | return 0; |
| 821 | } |
| 822 | |
| 823 | static void free_old_xmit_skbs(struct send_queue *sq) |
| 824 | { |
| 825 | struct sk_buff *skb; |
| 826 | unsigned int len; |
| 827 | struct virtnet_info *vi = sq->vq->vdev->priv; |
| 828 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
| 829 | |
| 830 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
| 831 | pr_debug("Sent skb %p\n", skb); |
| 832 | |
| 833 | u64_stats_update_begin(&stats->tx_syncp); |
| 834 | stats->tx_bytes += skb->len; |
| 835 | stats->tx_packets++; |
| 836 | u64_stats_update_end(&stats->tx_syncp); |
| 837 | |
| 838 | dev_kfree_skb_any(skb); |
| 839 | } |
| 840 | } |
| 841 | |
| 842 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
| 843 | { |
| 844 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
| 845 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
| 846 | struct virtnet_info *vi = sq->vq->vdev->priv; |
| 847 | unsigned num_sg; |
| 848 | unsigned hdr_len = vi->hdr_len; |
| 849 | bool can_push; |
| 850 | |
| 851 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
| 852 | |
| 853 | can_push = vi->any_header_sg && |
| 854 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && |
| 855 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; |
| 856 | /* Even if we can, don't push here yet as this would skew |
| 857 | * csum_start offset below. */ |
| 858 | if (can_push) |
| 859 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
| 860 | else |
| 861 | hdr = skb_vnet_hdr(skb); |
| 862 | |
| 863 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 864 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 865 | hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev, |
| 866 | skb_checksum_start_offset(skb)); |
| 867 | hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev, |
| 868 | skb->csum_offset); |
| 869 | } else { |
| 870 | hdr->hdr.flags = 0; |
| 871 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; |
| 872 | } |
| 873 | |
| 874 | if (skb_is_gso(skb)) { |
| 875 | hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb)); |
| 876 | hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev, |
| 877 | skb_shinfo(skb)->gso_size); |
| 878 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
| 879 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 880 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
| 881 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| 882 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
| 883 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
| 884 | else |
| 885 | BUG(); |
| 886 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
| 887 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 888 | } else { |
| 889 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 890 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; |
| 891 | } |
| 892 | |
| 893 | if (vi->mergeable_rx_bufs) |
| 894 | hdr->num_buffers = 0; |
| 895 | |
| 896 | sg_init_table(sq->sg, MAX_SKB_FRAGS + 2); |
| 897 | if (can_push) { |
| 898 | __skb_push(skb, hdr_len); |
| 899 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); |
| 900 | /* Pull header back to avoid skew in tx bytes calculations. */ |
| 901 | __skb_pull(skb, hdr_len); |
| 902 | } else { |
| 903 | sg_set_buf(sq->sg, hdr, hdr_len); |
| 904 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; |
| 905 | } |
| 906 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
| 907 | } |
| 908 | |
| 909 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 910 | { |
| 911 | struct virtnet_info *vi = netdev_priv(dev); |
| 912 | int qnum = skb_get_queue_mapping(skb); |
| 913 | struct send_queue *sq = &vi->sq[qnum]; |
| 914 | int err; |
| 915 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
| 916 | bool kick = !skb->xmit_more; |
| 917 | |
| 918 | /* Free up any pending old buffers before queueing new ones. */ |
| 919 | free_old_xmit_skbs(sq); |
| 920 | |
| 921 | /* timestamp packet in software */ |
| 922 | skb_tx_timestamp(skb); |
| 923 | |
| 924 | /* Try to transmit */ |
| 925 | err = xmit_skb(sq, skb); |
| 926 | |
| 927 | /* This should not happen! */ |
| 928 | if (unlikely(err)) { |
| 929 | dev->stats.tx_fifo_errors++; |
| 930 | if (net_ratelimit()) |
| 931 | dev_warn(&dev->dev, |
| 932 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
| 933 | dev->stats.tx_dropped++; |
| 934 | dev_kfree_skb_any(skb); |
| 935 | return NETDEV_TX_OK; |
| 936 | } |
| 937 | |
| 938 | /* Don't wait up for transmitted skbs to be freed. */ |
| 939 | skb_orphan(skb); |
| 940 | nf_reset(skb); |
| 941 | |
| 942 | /* If running out of space, stop queue to avoid getting packets that we |
| 943 | * are then unable to transmit. |
| 944 | * An alternative would be to force queuing layer to requeue the skb by |
| 945 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be |
| 946 | * returned in a normal path of operation: it means that driver is not |
| 947 | * maintaining the TX queue stop/start state properly, and causes |
| 948 | * the stack to do a non-trivial amount of useless work. |
| 949 | * Since most packets only take 1 or 2 ring slots, stopping the queue |
| 950 | * early means 16 slots are typically wasted. |
| 951 | */ |
| 952 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
| 953 | netif_stop_subqueue(dev, qnum); |
| 954 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
| 955 | /* More just got used, free them then recheck. */ |
| 956 | free_old_xmit_skbs(sq); |
| 957 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { |
| 958 | netif_start_subqueue(dev, qnum); |
| 959 | virtqueue_disable_cb(sq->vq); |
| 960 | } |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | if (kick || netif_xmit_stopped(txq)) |
| 965 | virtqueue_kick(sq->vq); |
| 966 | |
| 967 | return NETDEV_TX_OK; |
| 968 | } |
| 969 | |
| 970 | /* |
| 971 | * Send command via the control virtqueue and check status. Commands |
| 972 | * supported by the hypervisor, as indicated by feature bits, should |
| 973 | * never fail unless improperly formatted. |
| 974 | */ |
| 975 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, |
| 976 | struct scatterlist *out) |
| 977 | { |
| 978 | struct scatterlist *sgs[4], hdr, stat; |
| 979 | struct virtio_net_ctrl_hdr ctrl; |
| 980 | virtio_net_ctrl_ack status = ~0; |
| 981 | unsigned out_num = 0, tmp; |
| 982 | |
| 983 | /* Caller should know better */ |
| 984 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
| 985 | |
| 986 | ctrl.class = class; |
| 987 | ctrl.cmd = cmd; |
| 988 | /* Add header */ |
| 989 | sg_init_one(&hdr, &ctrl, sizeof(ctrl)); |
| 990 | sgs[out_num++] = &hdr; |
| 991 | |
| 992 | if (out) |
| 993 | sgs[out_num++] = out; |
| 994 | |
| 995 | /* Add return status. */ |
| 996 | sg_init_one(&stat, &status, sizeof(status)); |
| 997 | sgs[out_num] = &stat; |
| 998 | |
| 999 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
| 1000 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
| 1001 | |
| 1002 | if (unlikely(!virtqueue_kick(vi->cvq))) |
| 1003 | return status == VIRTIO_NET_OK; |
| 1004 | |
| 1005 | /* Spin for a response, the kick causes an ioport write, trapping |
| 1006 | * into the hypervisor, so the request should be handled immediately. |
| 1007 | */ |
| 1008 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
| 1009 | !virtqueue_is_broken(vi->cvq)) |
| 1010 | cpu_relax(); |
| 1011 | |
| 1012 | return status == VIRTIO_NET_OK; |
| 1013 | } |
| 1014 | |
| 1015 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
| 1016 | { |
| 1017 | struct virtnet_info *vi = netdev_priv(dev); |
| 1018 | struct virtio_device *vdev = vi->vdev; |
| 1019 | int ret; |
| 1020 | struct sockaddr *addr = p; |
| 1021 | struct scatterlist sg; |
| 1022 | |
| 1023 | ret = eth_prepare_mac_addr_change(dev, p); |
| 1024 | if (ret) |
| 1025 | return ret; |
| 1026 | |
| 1027 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
| 1028 | sg_init_one(&sg, addr->sa_data, dev->addr_len); |
| 1029 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, |
| 1030 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
| 1031 | dev_warn(&vdev->dev, |
| 1032 | "Failed to set mac address by vq command.\n"); |
| 1033 | return -EINVAL; |
| 1034 | } |
| 1035 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
| 1036 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
| 1037 | unsigned int i; |
| 1038 | |
| 1039 | /* Naturally, this has an atomicity problem. */ |
| 1040 | for (i = 0; i < dev->addr_len; i++) |
| 1041 | virtio_cwrite8(vdev, |
| 1042 | offsetof(struct virtio_net_config, mac) + |
| 1043 | i, addr->sa_data[i]); |
| 1044 | } |
| 1045 | |
| 1046 | eth_commit_mac_addr_change(dev, p); |
| 1047 | |
| 1048 | return 0; |
| 1049 | } |
| 1050 | |
| 1051 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
| 1052 | struct rtnl_link_stats64 *tot) |
| 1053 | { |
| 1054 | struct virtnet_info *vi = netdev_priv(dev); |
| 1055 | int cpu; |
| 1056 | unsigned int start; |
| 1057 | |
| 1058 | for_each_possible_cpu(cpu) { |
| 1059 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
| 1060 | u64 tpackets, tbytes, rpackets, rbytes; |
| 1061 | |
| 1062 | do { |
| 1063 | start = u64_stats_fetch_begin_irq(&stats->tx_syncp); |
| 1064 | tpackets = stats->tx_packets; |
| 1065 | tbytes = stats->tx_bytes; |
| 1066 | } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); |
| 1067 | |
| 1068 | do { |
| 1069 | start = u64_stats_fetch_begin_irq(&stats->rx_syncp); |
| 1070 | rpackets = stats->rx_packets; |
| 1071 | rbytes = stats->rx_bytes; |
| 1072 | } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); |
| 1073 | |
| 1074 | tot->rx_packets += rpackets; |
| 1075 | tot->tx_packets += tpackets; |
| 1076 | tot->rx_bytes += rbytes; |
| 1077 | tot->tx_bytes += tbytes; |
| 1078 | } |
| 1079 | |
| 1080 | tot->tx_dropped = dev->stats.tx_dropped; |
| 1081 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
| 1082 | tot->rx_dropped = dev->stats.rx_dropped; |
| 1083 | tot->rx_length_errors = dev->stats.rx_length_errors; |
| 1084 | tot->rx_frame_errors = dev->stats.rx_frame_errors; |
| 1085 | |
| 1086 | return tot; |
| 1087 | } |
| 1088 | |
| 1089 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1090 | static void virtnet_netpoll(struct net_device *dev) |
| 1091 | { |
| 1092 | struct virtnet_info *vi = netdev_priv(dev); |
| 1093 | int i; |
| 1094 | |
| 1095 | for (i = 0; i < vi->curr_queue_pairs; i++) |
| 1096 | napi_schedule(&vi->rq[i].napi); |
| 1097 | } |
| 1098 | #endif |
| 1099 | |
| 1100 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
| 1101 | { |
| 1102 | rtnl_lock(); |
| 1103 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, |
| 1104 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
| 1105 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
| 1106 | rtnl_unlock(); |
| 1107 | } |
| 1108 | |
| 1109 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
| 1110 | { |
| 1111 | struct scatterlist sg; |
| 1112 | struct virtio_net_ctrl_mq s; |
| 1113 | struct net_device *dev = vi->dev; |
| 1114 | |
| 1115 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) |
| 1116 | return 0; |
| 1117 | |
| 1118 | s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
| 1119 | sg_init_one(&sg, &s, sizeof(s)); |
| 1120 | |
| 1121 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, |
| 1122 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
| 1123 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
| 1124 | queue_pairs); |
| 1125 | return -EINVAL; |
| 1126 | } else { |
| 1127 | vi->curr_queue_pairs = queue_pairs; |
| 1128 | /* virtnet_open() will refill when device is going to up. */ |
| 1129 | if (dev->flags & IFF_UP) |
| 1130 | schedule_delayed_work(&vi->refill, 0); |
| 1131 | } |
| 1132 | |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
| 1136 | static int virtnet_close(struct net_device *dev) |
| 1137 | { |
| 1138 | struct virtnet_info *vi = netdev_priv(dev); |
| 1139 | int i; |
| 1140 | |
| 1141 | /* Make sure refill_work doesn't re-enable napi! */ |
| 1142 | cancel_delayed_work_sync(&vi->refill); |
| 1143 | |
| 1144 | for (i = 0; i < vi->max_queue_pairs; i++) |
| 1145 | napi_disable(&vi->rq[i].napi); |
| 1146 | |
| 1147 | return 0; |
| 1148 | } |
| 1149 | |
| 1150 | static void virtnet_set_rx_mode(struct net_device *dev) |
| 1151 | { |
| 1152 | struct virtnet_info *vi = netdev_priv(dev); |
| 1153 | struct scatterlist sg[2]; |
| 1154 | u8 promisc, allmulti; |
| 1155 | struct virtio_net_ctrl_mac *mac_data; |
| 1156 | struct netdev_hw_addr *ha; |
| 1157 | int uc_count; |
| 1158 | int mc_count; |
| 1159 | void *buf; |
| 1160 | int i; |
| 1161 | |
| 1162 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
| 1163 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
| 1164 | return; |
| 1165 | |
| 1166 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
| 1167 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); |
| 1168 | |
| 1169 | sg_init_one(sg, &promisc, sizeof(promisc)); |
| 1170 | |
| 1171 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, |
| 1172 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
| 1173 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
| 1174 | promisc ? "en" : "dis"); |
| 1175 | |
| 1176 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
| 1177 | |
| 1178 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, |
| 1179 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
| 1180 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
| 1181 | allmulti ? "en" : "dis"); |
| 1182 | |
| 1183 | uc_count = netdev_uc_count(dev); |
| 1184 | mc_count = netdev_mc_count(dev); |
| 1185 | /* MAC filter - use one buffer for both lists */ |
| 1186 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
| 1187 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); |
| 1188 | mac_data = buf; |
| 1189 | if (!buf) |
| 1190 | return; |
| 1191 | |
| 1192 | sg_init_table(sg, 2); |
| 1193 | |
| 1194 | /* Store the unicast list and count in the front of the buffer */ |
| 1195 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
| 1196 | i = 0; |
| 1197 | netdev_for_each_uc_addr(ha, dev) |
| 1198 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
| 1199 | |
| 1200 | sg_set_buf(&sg[0], mac_data, |
| 1201 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
| 1202 | |
| 1203 | /* multicast list and count fill the end */ |
| 1204 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
| 1205 | |
| 1206 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
| 1207 | i = 0; |
| 1208 | netdev_for_each_mc_addr(ha, dev) |
| 1209 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
| 1210 | |
| 1211 | sg_set_buf(&sg[1], mac_data, |
| 1212 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
| 1213 | |
| 1214 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, |
| 1215 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
| 1216 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
| 1217 | |
| 1218 | kfree(buf); |
| 1219 | } |
| 1220 | |
| 1221 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
| 1222 | __be16 proto, u16 vid) |
| 1223 | { |
| 1224 | struct virtnet_info *vi = netdev_priv(dev); |
| 1225 | struct scatterlist sg; |
| 1226 | |
| 1227 | sg_init_one(&sg, &vid, sizeof(vid)); |
| 1228 | |
| 1229 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, |
| 1230 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
| 1231 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
| 1232 | return 0; |
| 1233 | } |
| 1234 | |
| 1235 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
| 1236 | __be16 proto, u16 vid) |
| 1237 | { |
| 1238 | struct virtnet_info *vi = netdev_priv(dev); |
| 1239 | struct scatterlist sg; |
| 1240 | |
| 1241 | sg_init_one(&sg, &vid, sizeof(vid)); |
| 1242 | |
| 1243 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, |
| 1244 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
| 1245 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
| 1246 | return 0; |
| 1247 | } |
| 1248 | |
| 1249 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
| 1250 | { |
| 1251 | int i; |
| 1252 | |
| 1253 | if (vi->affinity_hint_set) { |
| 1254 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1255 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
| 1256 | virtqueue_set_affinity(vi->sq[i].vq, -1); |
| 1257 | } |
| 1258 | |
| 1259 | vi->affinity_hint_set = false; |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | static void virtnet_set_affinity(struct virtnet_info *vi) |
| 1264 | { |
| 1265 | int i; |
| 1266 | int cpu; |
| 1267 | |
| 1268 | /* In multiqueue mode, when the number of cpu is equal to the number of |
| 1269 | * queue pairs, we let the queue pairs to be private to one cpu by |
| 1270 | * setting the affinity hint to eliminate the contention. |
| 1271 | */ |
| 1272 | if (vi->curr_queue_pairs == 1 || |
| 1273 | vi->max_queue_pairs != num_online_cpus()) { |
| 1274 | virtnet_clean_affinity(vi, -1); |
| 1275 | return; |
| 1276 | } |
| 1277 | |
| 1278 | i = 0; |
| 1279 | for_each_online_cpu(cpu) { |
| 1280 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
| 1281 | virtqueue_set_affinity(vi->sq[i].vq, cpu); |
| 1282 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
| 1283 | i++; |
| 1284 | } |
| 1285 | |
| 1286 | vi->affinity_hint_set = true; |
| 1287 | } |
| 1288 | |
| 1289 | static int virtnet_cpu_callback(struct notifier_block *nfb, |
| 1290 | unsigned long action, void *hcpu) |
| 1291 | { |
| 1292 | struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); |
| 1293 | |
| 1294 | switch(action & ~CPU_TASKS_FROZEN) { |
| 1295 | case CPU_ONLINE: |
| 1296 | case CPU_DOWN_FAILED: |
| 1297 | case CPU_DEAD: |
| 1298 | virtnet_set_affinity(vi); |
| 1299 | break; |
| 1300 | case CPU_DOWN_PREPARE: |
| 1301 | virtnet_clean_affinity(vi, (long)hcpu); |
| 1302 | break; |
| 1303 | default: |
| 1304 | break; |
| 1305 | } |
| 1306 | |
| 1307 | return NOTIFY_OK; |
| 1308 | } |
| 1309 | |
| 1310 | static void virtnet_get_ringparam(struct net_device *dev, |
| 1311 | struct ethtool_ringparam *ring) |
| 1312 | { |
| 1313 | struct virtnet_info *vi = netdev_priv(dev); |
| 1314 | |
| 1315 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
| 1316 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); |
| 1317 | ring->rx_pending = ring->rx_max_pending; |
| 1318 | ring->tx_pending = ring->tx_max_pending; |
| 1319 | } |
| 1320 | |
| 1321 | |
| 1322 | static void virtnet_get_drvinfo(struct net_device *dev, |
| 1323 | struct ethtool_drvinfo *info) |
| 1324 | { |
| 1325 | struct virtnet_info *vi = netdev_priv(dev); |
| 1326 | struct virtio_device *vdev = vi->vdev; |
| 1327 | |
| 1328 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); |
| 1329 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); |
| 1330 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); |
| 1331 | |
| 1332 | } |
| 1333 | |
| 1334 | /* TODO: Eliminate OOO packets during switching */ |
| 1335 | static int virtnet_set_channels(struct net_device *dev, |
| 1336 | struct ethtool_channels *channels) |
| 1337 | { |
| 1338 | struct virtnet_info *vi = netdev_priv(dev); |
| 1339 | u16 queue_pairs = channels->combined_count; |
| 1340 | int err; |
| 1341 | |
| 1342 | /* We don't support separate rx/tx channels. |
| 1343 | * We don't allow setting 'other' channels. |
| 1344 | */ |
| 1345 | if (channels->rx_count || channels->tx_count || channels->other_count) |
| 1346 | return -EINVAL; |
| 1347 | |
| 1348 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
| 1349 | return -EINVAL; |
| 1350 | |
| 1351 | get_online_cpus(); |
| 1352 | err = virtnet_set_queues(vi, queue_pairs); |
| 1353 | if (!err) { |
| 1354 | netif_set_real_num_tx_queues(dev, queue_pairs); |
| 1355 | netif_set_real_num_rx_queues(dev, queue_pairs); |
| 1356 | |
| 1357 | virtnet_set_affinity(vi); |
| 1358 | } |
| 1359 | put_online_cpus(); |
| 1360 | |
| 1361 | return err; |
| 1362 | } |
| 1363 | |
| 1364 | static void virtnet_get_channels(struct net_device *dev, |
| 1365 | struct ethtool_channels *channels) |
| 1366 | { |
| 1367 | struct virtnet_info *vi = netdev_priv(dev); |
| 1368 | |
| 1369 | channels->combined_count = vi->curr_queue_pairs; |
| 1370 | channels->max_combined = vi->max_queue_pairs; |
| 1371 | channels->max_other = 0; |
| 1372 | channels->rx_count = 0; |
| 1373 | channels->tx_count = 0; |
| 1374 | channels->other_count = 0; |
| 1375 | } |
| 1376 | |
| 1377 | static const struct ethtool_ops virtnet_ethtool_ops = { |
| 1378 | .get_drvinfo = virtnet_get_drvinfo, |
| 1379 | .get_link = ethtool_op_get_link, |
| 1380 | .get_ringparam = virtnet_get_ringparam, |
| 1381 | .set_channels = virtnet_set_channels, |
| 1382 | .get_channels = virtnet_get_channels, |
| 1383 | .get_ts_info = ethtool_op_get_ts_info, |
| 1384 | }; |
| 1385 | |
| 1386 | #define MIN_MTU 68 |
| 1387 | #define MAX_MTU 65535 |
| 1388 | |
| 1389 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) |
| 1390 | { |
| 1391 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) |
| 1392 | return -EINVAL; |
| 1393 | dev->mtu = new_mtu; |
| 1394 | return 0; |
| 1395 | } |
| 1396 | |
| 1397 | static const struct net_device_ops virtnet_netdev = { |
| 1398 | .ndo_open = virtnet_open, |
| 1399 | .ndo_stop = virtnet_close, |
| 1400 | .ndo_start_xmit = start_xmit, |
| 1401 | .ndo_validate_addr = eth_validate_addr, |
| 1402 | .ndo_set_mac_address = virtnet_set_mac_address, |
| 1403 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
| 1404 | .ndo_change_mtu = virtnet_change_mtu, |
| 1405 | .ndo_get_stats64 = virtnet_stats, |
| 1406 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
| 1407 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, |
| 1408 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1409 | .ndo_poll_controller = virtnet_netpoll, |
| 1410 | #endif |
| 1411 | #ifdef CONFIG_NET_RX_BUSY_POLL |
| 1412 | .ndo_busy_poll = virtnet_busy_poll, |
| 1413 | #endif |
| 1414 | }; |
| 1415 | |
| 1416 | static void virtnet_config_changed_work(struct work_struct *work) |
| 1417 | { |
| 1418 | struct virtnet_info *vi = |
| 1419 | container_of(work, struct virtnet_info, config_work); |
| 1420 | u16 v; |
| 1421 | |
| 1422 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
| 1423 | struct virtio_net_config, status, &v) < 0) |
| 1424 | return; |
| 1425 | |
| 1426 | if (v & VIRTIO_NET_S_ANNOUNCE) { |
| 1427 | netdev_notify_peers(vi->dev); |
| 1428 | virtnet_ack_link_announce(vi); |
| 1429 | } |
| 1430 | |
| 1431 | /* Ignore unknown (future) status bits */ |
| 1432 | v &= VIRTIO_NET_S_LINK_UP; |
| 1433 | |
| 1434 | if (vi->status == v) |
| 1435 | return; |
| 1436 | |
| 1437 | vi->status = v; |
| 1438 | |
| 1439 | if (vi->status & VIRTIO_NET_S_LINK_UP) { |
| 1440 | netif_carrier_on(vi->dev); |
| 1441 | netif_tx_wake_all_queues(vi->dev); |
| 1442 | } else { |
| 1443 | netif_carrier_off(vi->dev); |
| 1444 | netif_tx_stop_all_queues(vi->dev); |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | static void virtnet_config_changed(struct virtio_device *vdev) |
| 1449 | { |
| 1450 | struct virtnet_info *vi = vdev->priv; |
| 1451 | |
| 1452 | schedule_work(&vi->config_work); |
| 1453 | } |
| 1454 | |
| 1455 | static void virtnet_free_queues(struct virtnet_info *vi) |
| 1456 | { |
| 1457 | int i; |
| 1458 | |
| 1459 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1460 | napi_hash_del(&vi->rq[i].napi); |
| 1461 | netif_napi_del(&vi->rq[i].napi); |
| 1462 | } |
| 1463 | |
| 1464 | kfree(vi->rq); |
| 1465 | kfree(vi->sq); |
| 1466 | } |
| 1467 | |
| 1468 | static void free_receive_bufs(struct virtnet_info *vi) |
| 1469 | { |
| 1470 | int i; |
| 1471 | |
| 1472 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1473 | while (vi->rq[i].pages) |
| 1474 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); |
| 1475 | } |
| 1476 | } |
| 1477 | |
| 1478 | static void free_receive_page_frags(struct virtnet_info *vi) |
| 1479 | { |
| 1480 | int i; |
| 1481 | for (i = 0; i < vi->max_queue_pairs; i++) |
| 1482 | if (vi->rq[i].alloc_frag.page) |
| 1483 | put_page(vi->rq[i].alloc_frag.page); |
| 1484 | } |
| 1485 | |
| 1486 | static void free_unused_bufs(struct virtnet_info *vi) |
| 1487 | { |
| 1488 | void *buf; |
| 1489 | int i; |
| 1490 | |
| 1491 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1492 | struct virtqueue *vq = vi->sq[i].vq; |
| 1493 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) |
| 1494 | dev_kfree_skb(buf); |
| 1495 | } |
| 1496 | |
| 1497 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1498 | struct virtqueue *vq = vi->rq[i].vq; |
| 1499 | |
| 1500 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { |
| 1501 | if (vi->mergeable_rx_bufs) { |
| 1502 | unsigned long ctx = (unsigned long)buf; |
| 1503 | void *base = mergeable_ctx_to_buf_address(ctx); |
| 1504 | put_page(virt_to_head_page(base)); |
| 1505 | } else if (vi->big_packets) { |
| 1506 | give_pages(&vi->rq[i], buf); |
| 1507 | } else { |
| 1508 | dev_kfree_skb(buf); |
| 1509 | } |
| 1510 | } |
| 1511 | } |
| 1512 | } |
| 1513 | |
| 1514 | static void virtnet_del_vqs(struct virtnet_info *vi) |
| 1515 | { |
| 1516 | struct virtio_device *vdev = vi->vdev; |
| 1517 | |
| 1518 | virtnet_clean_affinity(vi, -1); |
| 1519 | |
| 1520 | vdev->config->del_vqs(vdev); |
| 1521 | |
| 1522 | virtnet_free_queues(vi); |
| 1523 | } |
| 1524 | |
| 1525 | static int virtnet_find_vqs(struct virtnet_info *vi) |
| 1526 | { |
| 1527 | vq_callback_t **callbacks; |
| 1528 | struct virtqueue **vqs; |
| 1529 | int ret = -ENOMEM; |
| 1530 | int i, total_vqs; |
| 1531 | const char **names; |
| 1532 | |
| 1533 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by |
| 1534 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by |
| 1535 | * possible control vq. |
| 1536 | */ |
| 1537 | total_vqs = vi->max_queue_pairs * 2 + |
| 1538 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); |
| 1539 | |
| 1540 | /* Allocate space for find_vqs parameters */ |
| 1541 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); |
| 1542 | if (!vqs) |
| 1543 | goto err_vq; |
| 1544 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); |
| 1545 | if (!callbacks) |
| 1546 | goto err_callback; |
| 1547 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); |
| 1548 | if (!names) |
| 1549 | goto err_names; |
| 1550 | |
| 1551 | /* Parameters for control virtqueue, if any */ |
| 1552 | if (vi->has_cvq) { |
| 1553 | callbacks[total_vqs - 1] = NULL; |
| 1554 | names[total_vqs - 1] = "control"; |
| 1555 | } |
| 1556 | |
| 1557 | /* Allocate/initialize parameters for send/receive virtqueues */ |
| 1558 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1559 | callbacks[rxq2vq(i)] = skb_recv_done; |
| 1560 | callbacks[txq2vq(i)] = skb_xmit_done; |
| 1561 | sprintf(vi->rq[i].name, "input.%d", i); |
| 1562 | sprintf(vi->sq[i].name, "output.%d", i); |
| 1563 | names[rxq2vq(i)] = vi->rq[i].name; |
| 1564 | names[txq2vq(i)] = vi->sq[i].name; |
| 1565 | } |
| 1566 | |
| 1567 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
| 1568 | names); |
| 1569 | if (ret) |
| 1570 | goto err_find; |
| 1571 | |
| 1572 | if (vi->has_cvq) { |
| 1573 | vi->cvq = vqs[total_vqs - 1]; |
| 1574 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
| 1575 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
| 1576 | } |
| 1577 | |
| 1578 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1579 | vi->rq[i].vq = vqs[rxq2vq(i)]; |
| 1580 | vi->sq[i].vq = vqs[txq2vq(i)]; |
| 1581 | } |
| 1582 | |
| 1583 | kfree(names); |
| 1584 | kfree(callbacks); |
| 1585 | kfree(vqs); |
| 1586 | |
| 1587 | return 0; |
| 1588 | |
| 1589 | err_find: |
| 1590 | kfree(names); |
| 1591 | err_names: |
| 1592 | kfree(callbacks); |
| 1593 | err_callback: |
| 1594 | kfree(vqs); |
| 1595 | err_vq: |
| 1596 | return ret; |
| 1597 | } |
| 1598 | |
| 1599 | static int virtnet_alloc_queues(struct virtnet_info *vi) |
| 1600 | { |
| 1601 | int i; |
| 1602 | |
| 1603 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); |
| 1604 | if (!vi->sq) |
| 1605 | goto err_sq; |
| 1606 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); |
| 1607 | if (!vi->rq) |
| 1608 | goto err_rq; |
| 1609 | |
| 1610 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
| 1611 | for (i = 0; i < vi->max_queue_pairs; i++) { |
| 1612 | vi->rq[i].pages = NULL; |
| 1613 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, |
| 1614 | napi_weight); |
| 1615 | napi_hash_add(&vi->rq[i].napi); |
| 1616 | |
| 1617 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); |
| 1618 | ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); |
| 1619 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
| 1620 | } |
| 1621 | |
| 1622 | return 0; |
| 1623 | |
| 1624 | err_rq: |
| 1625 | kfree(vi->sq); |
| 1626 | err_sq: |
| 1627 | return -ENOMEM; |
| 1628 | } |
| 1629 | |
| 1630 | static int init_vqs(struct virtnet_info *vi) |
| 1631 | { |
| 1632 | int ret; |
| 1633 | |
| 1634 | /* Allocate send & receive queues */ |
| 1635 | ret = virtnet_alloc_queues(vi); |
| 1636 | if (ret) |
| 1637 | goto err; |
| 1638 | |
| 1639 | ret = virtnet_find_vqs(vi); |
| 1640 | if (ret) |
| 1641 | goto err_free; |
| 1642 | |
| 1643 | get_online_cpus(); |
| 1644 | virtnet_set_affinity(vi); |
| 1645 | put_online_cpus(); |
| 1646 | |
| 1647 | return 0; |
| 1648 | |
| 1649 | err_free: |
| 1650 | virtnet_free_queues(vi); |
| 1651 | err: |
| 1652 | return ret; |
| 1653 | } |
| 1654 | |
| 1655 | #ifdef CONFIG_SYSFS |
| 1656 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, |
| 1657 | struct rx_queue_attribute *attribute, char *buf) |
| 1658 | { |
| 1659 | struct virtnet_info *vi = netdev_priv(queue->dev); |
| 1660 | unsigned int queue_index = get_netdev_rx_queue_index(queue); |
| 1661 | struct ewma *avg; |
| 1662 | |
| 1663 | BUG_ON(queue_index >= vi->max_queue_pairs); |
| 1664 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; |
| 1665 | return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); |
| 1666 | } |
| 1667 | |
| 1668 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = |
| 1669 | __ATTR_RO(mergeable_rx_buffer_size); |
| 1670 | |
| 1671 | static struct attribute *virtio_net_mrg_rx_attrs[] = { |
| 1672 | &mergeable_rx_buffer_size_attribute.attr, |
| 1673 | NULL |
| 1674 | }; |
| 1675 | |
| 1676 | static const struct attribute_group virtio_net_mrg_rx_group = { |
| 1677 | .name = "virtio_net", |
| 1678 | .attrs = virtio_net_mrg_rx_attrs |
| 1679 | }; |
| 1680 | #endif |
| 1681 | |
| 1682 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
| 1683 | unsigned int fbit, |
| 1684 | const char *fname, const char *dname) |
| 1685 | { |
| 1686 | if (!virtio_has_feature(vdev, fbit)) |
| 1687 | return false; |
| 1688 | |
| 1689 | dev_err(&vdev->dev, "device advertises feature %s but not %s", |
| 1690 | fname, dname); |
| 1691 | |
| 1692 | return true; |
| 1693 | } |
| 1694 | |
| 1695 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ |
| 1696 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) |
| 1697 | |
| 1698 | static bool virtnet_validate_features(struct virtio_device *vdev) |
| 1699 | { |
| 1700 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && |
| 1701 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, |
| 1702 | "VIRTIO_NET_F_CTRL_VQ") || |
| 1703 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, |
| 1704 | "VIRTIO_NET_F_CTRL_VQ") || |
| 1705 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, |
| 1706 | "VIRTIO_NET_F_CTRL_VQ") || |
| 1707 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || |
| 1708 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, |
| 1709 | "VIRTIO_NET_F_CTRL_VQ"))) { |
| 1710 | return false; |
| 1711 | } |
| 1712 | |
| 1713 | return true; |
| 1714 | } |
| 1715 | |
| 1716 | static int virtnet_probe(struct virtio_device *vdev) |
| 1717 | { |
| 1718 | int i, err; |
| 1719 | struct net_device *dev; |
| 1720 | struct virtnet_info *vi; |
| 1721 | u16 max_queue_pairs; |
| 1722 | |
| 1723 | if (!vdev->config->get) { |
| 1724 | dev_err(&vdev->dev, "%s failure: config access disabled\n", |
| 1725 | __func__); |
| 1726 | return -EINVAL; |
| 1727 | } |
| 1728 | |
| 1729 | if (!virtnet_validate_features(vdev)) |
| 1730 | return -EINVAL; |
| 1731 | |
| 1732 | /* Find if host supports multiqueue virtio_net device */ |
| 1733 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
| 1734 | struct virtio_net_config, |
| 1735 | max_virtqueue_pairs, &max_queue_pairs); |
| 1736 | |
| 1737 | /* We need at least 2 queue's */ |
| 1738 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || |
| 1739 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || |
| 1740 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
| 1741 | max_queue_pairs = 1; |
| 1742 | |
| 1743 | /* Allocate ourselves a network device with room for our info */ |
| 1744 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
| 1745 | if (!dev) |
| 1746 | return -ENOMEM; |
| 1747 | |
| 1748 | /* Set up network device as normal. */ |
| 1749 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
| 1750 | dev->netdev_ops = &virtnet_netdev; |
| 1751 | dev->features = NETIF_F_HIGHDMA; |
| 1752 | |
| 1753 | dev->ethtool_ops = &virtnet_ethtool_ops; |
| 1754 | SET_NETDEV_DEV(dev, &vdev->dev); |
| 1755 | |
| 1756 | /* Do we support "hardware" checksums? */ |
| 1757 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
| 1758 | /* This opens up the world of extra features. */ |
| 1759 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
| 1760 | if (csum) |
| 1761 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
| 1762 | |
| 1763 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
| 1764 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO |
| 1765 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
| 1766 | } |
| 1767 | /* Individual feature bits: what can host handle? */ |
| 1768 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
| 1769 | dev->hw_features |= NETIF_F_TSO; |
| 1770 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
| 1771 | dev->hw_features |= NETIF_F_TSO6; |
| 1772 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
| 1773 | dev->hw_features |= NETIF_F_TSO_ECN; |
| 1774 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
| 1775 | dev->hw_features |= NETIF_F_UFO; |
| 1776 | |
| 1777 | dev->features |= NETIF_F_GSO_ROBUST; |
| 1778 | |
| 1779 | if (gso) |
| 1780 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); |
| 1781 | /* (!csum && gso) case will be fixed by register_netdev() */ |
| 1782 | } |
| 1783 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
| 1784 | dev->features |= NETIF_F_RXCSUM; |
| 1785 | |
| 1786 | dev->vlan_features = dev->features; |
| 1787 | |
| 1788 | /* Configuration may specify what MAC to use. Otherwise random. */ |
| 1789 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
| 1790 | virtio_cread_bytes(vdev, |
| 1791 | offsetof(struct virtio_net_config, mac), |
| 1792 | dev->dev_addr, dev->addr_len); |
| 1793 | else |
| 1794 | eth_hw_addr_random(dev); |
| 1795 | |
| 1796 | /* Set up our device-specific information */ |
| 1797 | vi = netdev_priv(dev); |
| 1798 | vi->dev = dev; |
| 1799 | vi->vdev = vdev; |
| 1800 | vdev->priv = vi; |
| 1801 | vi->stats = alloc_percpu(struct virtnet_stats); |
| 1802 | err = -ENOMEM; |
| 1803 | if (vi->stats == NULL) |
| 1804 | goto free; |
| 1805 | |
| 1806 | for_each_possible_cpu(i) { |
| 1807 | struct virtnet_stats *virtnet_stats; |
| 1808 | virtnet_stats = per_cpu_ptr(vi->stats, i); |
| 1809 | u64_stats_init(&virtnet_stats->tx_syncp); |
| 1810 | u64_stats_init(&virtnet_stats->rx_syncp); |
| 1811 | } |
| 1812 | |
| 1813 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
| 1814 | |
| 1815 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
| 1816 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
| 1817 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || |
| 1818 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
| 1819 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) |
| 1820 | vi->big_packets = true; |
| 1821 | |
| 1822 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
| 1823 | vi->mergeable_rx_bufs = true; |
| 1824 | |
| 1825 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
| 1826 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) |
| 1827 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
| 1828 | else |
| 1829 | vi->hdr_len = sizeof(struct virtio_net_hdr); |
| 1830 | |
| 1831 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) |
| 1832 | vi->any_header_sg = true; |
| 1833 | |
| 1834 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
| 1835 | vi->has_cvq = true; |
| 1836 | |
| 1837 | if (vi->any_header_sg) |
| 1838 | dev->needed_headroom = vi->hdr_len; |
| 1839 | |
| 1840 | /* Use single tx/rx queue pair as default */ |
| 1841 | vi->curr_queue_pairs = 1; |
| 1842 | vi->max_queue_pairs = max_queue_pairs; |
| 1843 | |
| 1844 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ |
| 1845 | err = init_vqs(vi); |
| 1846 | if (err) |
| 1847 | goto free_stats; |
| 1848 | |
| 1849 | #ifdef CONFIG_SYSFS |
| 1850 | if (vi->mergeable_rx_bufs) |
| 1851 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; |
| 1852 | #endif |
| 1853 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
| 1854 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); |
| 1855 | |
| 1856 | err = register_netdev(dev); |
| 1857 | if (err) { |
| 1858 | pr_debug("virtio_net: registering device failed\n"); |
| 1859 | goto free_vqs; |
| 1860 | } |
| 1861 | |
| 1862 | virtio_device_ready(vdev); |
| 1863 | |
| 1864 | /* Last of all, set up some receive buffers. */ |
| 1865 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
| 1866 | try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); |
| 1867 | |
| 1868 | /* If we didn't even get one input buffer, we're useless. */ |
| 1869 | if (vi->rq[i].vq->num_free == |
| 1870 | virtqueue_get_vring_size(vi->rq[i].vq)) { |
| 1871 | free_unused_bufs(vi); |
| 1872 | err = -ENOMEM; |
| 1873 | goto free_recv_bufs; |
| 1874 | } |
| 1875 | } |
| 1876 | |
| 1877 | vi->nb.notifier_call = &virtnet_cpu_callback; |
| 1878 | err = register_hotcpu_notifier(&vi->nb); |
| 1879 | if (err) { |
| 1880 | pr_debug("virtio_net: registering cpu notifier failed\n"); |
| 1881 | goto free_recv_bufs; |
| 1882 | } |
| 1883 | |
| 1884 | /* Assume link up if device can't report link status, |
| 1885 | otherwise get link status from config. */ |
| 1886 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { |
| 1887 | netif_carrier_off(dev); |
| 1888 | schedule_work(&vi->config_work); |
| 1889 | } else { |
| 1890 | vi->status = VIRTIO_NET_S_LINK_UP; |
| 1891 | netif_carrier_on(dev); |
| 1892 | } |
| 1893 | |
| 1894 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
| 1895 | dev->name, max_queue_pairs); |
| 1896 | |
| 1897 | return 0; |
| 1898 | |
| 1899 | free_recv_bufs: |
| 1900 | vi->vdev->config->reset(vdev); |
| 1901 | |
| 1902 | free_receive_bufs(vi); |
| 1903 | unregister_netdev(dev); |
| 1904 | free_vqs: |
| 1905 | cancel_delayed_work_sync(&vi->refill); |
| 1906 | free_receive_page_frags(vi); |
| 1907 | virtnet_del_vqs(vi); |
| 1908 | free_stats: |
| 1909 | free_percpu(vi->stats); |
| 1910 | free: |
| 1911 | free_netdev(dev); |
| 1912 | return err; |
| 1913 | } |
| 1914 | |
| 1915 | static void remove_vq_common(struct virtnet_info *vi) |
| 1916 | { |
| 1917 | vi->vdev->config->reset(vi->vdev); |
| 1918 | |
| 1919 | /* Free unused buffers in both send and recv, if any. */ |
| 1920 | free_unused_bufs(vi); |
| 1921 | |
| 1922 | free_receive_bufs(vi); |
| 1923 | |
| 1924 | free_receive_page_frags(vi); |
| 1925 | |
| 1926 | virtnet_del_vqs(vi); |
| 1927 | } |
| 1928 | |
| 1929 | static void virtnet_remove(struct virtio_device *vdev) |
| 1930 | { |
| 1931 | struct virtnet_info *vi = vdev->priv; |
| 1932 | |
| 1933 | unregister_hotcpu_notifier(&vi->nb); |
| 1934 | |
| 1935 | /* Make sure no work handler is accessing the device. */ |
| 1936 | flush_work(&vi->config_work); |
| 1937 | |
| 1938 | unregister_netdev(vi->dev); |
| 1939 | |
| 1940 | remove_vq_common(vi); |
| 1941 | |
| 1942 | free_percpu(vi->stats); |
| 1943 | free_netdev(vi->dev); |
| 1944 | } |
| 1945 | |
| 1946 | #ifdef CONFIG_PM_SLEEP |
| 1947 | static int virtnet_freeze(struct virtio_device *vdev) |
| 1948 | { |
| 1949 | struct virtnet_info *vi = vdev->priv; |
| 1950 | int i; |
| 1951 | |
| 1952 | unregister_hotcpu_notifier(&vi->nb); |
| 1953 | |
| 1954 | /* Make sure no work handler is accessing the device */ |
| 1955 | flush_work(&vi->config_work); |
| 1956 | |
| 1957 | netif_device_detach(vi->dev); |
| 1958 | cancel_delayed_work_sync(&vi->refill); |
| 1959 | |
| 1960 | if (netif_running(vi->dev)) { |
| 1961 | for (i = 0; i < vi->max_queue_pairs; i++) |
| 1962 | napi_disable(&vi->rq[i].napi); |
| 1963 | } |
| 1964 | |
| 1965 | remove_vq_common(vi); |
| 1966 | |
| 1967 | return 0; |
| 1968 | } |
| 1969 | |
| 1970 | static int virtnet_restore(struct virtio_device *vdev) |
| 1971 | { |
| 1972 | struct virtnet_info *vi = vdev->priv; |
| 1973 | int err, i; |
| 1974 | |
| 1975 | err = init_vqs(vi); |
| 1976 | if (err) |
| 1977 | return err; |
| 1978 | |
| 1979 | virtio_device_ready(vdev); |
| 1980 | |
| 1981 | if (netif_running(vi->dev)) { |
| 1982 | for (i = 0; i < vi->curr_queue_pairs; i++) |
| 1983 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
| 1984 | schedule_delayed_work(&vi->refill, 0); |
| 1985 | |
| 1986 | for (i = 0; i < vi->max_queue_pairs; i++) |
| 1987 | virtnet_napi_enable(&vi->rq[i]); |
| 1988 | } |
| 1989 | |
| 1990 | netif_device_attach(vi->dev); |
| 1991 | |
| 1992 | rtnl_lock(); |
| 1993 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
| 1994 | rtnl_unlock(); |
| 1995 | |
| 1996 | err = register_hotcpu_notifier(&vi->nb); |
| 1997 | if (err) |
| 1998 | return err; |
| 1999 | |
| 2000 | return 0; |
| 2001 | } |
| 2002 | #endif |
| 2003 | |
| 2004 | static struct virtio_device_id id_table[] = { |
| 2005 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, |
| 2006 | { 0 }, |
| 2007 | }; |
| 2008 | |
| 2009 | static unsigned int features[] = { |
| 2010 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
| 2011 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, |
| 2012 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
| 2013 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
| 2014 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
| 2015 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
| 2016 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
| 2017 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
| 2018 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
| 2019 | VIRTIO_F_ANY_LAYOUT, |
| 2020 | }; |
| 2021 | |
| 2022 | static struct virtio_driver virtio_net_driver = { |
| 2023 | .feature_table = features, |
| 2024 | .feature_table_size = ARRAY_SIZE(features), |
| 2025 | .driver.name = KBUILD_MODNAME, |
| 2026 | .driver.owner = THIS_MODULE, |
| 2027 | .id_table = id_table, |
| 2028 | .probe = virtnet_probe, |
| 2029 | .remove = virtnet_remove, |
| 2030 | .config_changed = virtnet_config_changed, |
| 2031 | #ifdef CONFIG_PM_SLEEP |
| 2032 | .freeze = virtnet_freeze, |
| 2033 | .restore = virtnet_restore, |
| 2034 | #endif |
| 2035 | }; |
| 2036 | |
| 2037 | module_virtio_driver(virtio_net_driver); |
| 2038 | |
| 2039 | MODULE_DEVICE_TABLE(virtio, id_table); |
| 2040 | MODULE_DESCRIPTION("Virtio network driver"); |
| 2041 | MODULE_LICENSE("GPL"); |