1 /* 2 * Copyright (c) 2009, Microsoft Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, see <http://www.gnu.org/licenses/>. 15 * 16 * Authors: 17 * Haiyang Zhang <haiyangz@microsoft.com> 18 * Hank Janssen <hjanssen@microsoft.com> 19 */ 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/init.h> 23 #include <linux/atomic.h> 24 #include <linux/module.h> 25 #include <linux/highmem.h> 26 #include <linux/device.h> 27 #include <linux/io.h> 28 #include <linux/delay.h> 29 #include <linux/netdevice.h> 30 #include <linux/inetdevice.h> 31 #include <linux/etherdevice.h> 32 #include <linux/skbuff.h> 33 #include <linux/if_vlan.h> 34 #include <linux/in.h> 35 #include <linux/slab.h> 36 #include <net/arp.h> 37 #include <net/route.h> 38 #include <net/sock.h> 39 #include <net/pkt_sched.h> 40 41 #include "hyperv_net.h" 42 43 struct net_device_context { 44 /* point back to our device context */ 45 struct hv_device *device_ctx; 46 struct delayed_work dwork; 47 struct work_struct work; 48 }; 49 50 #define RING_SIZE_MIN 64 51 static int ring_size = 128; 52 module_param(ring_size, int, S_IRUGO); 53 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); 54 55 static void do_set_multicast(struct work_struct *w) 56 { 57 struct net_device_context *ndevctx = 58 container_of(w, struct net_device_context, work); 59 struct netvsc_device *nvdev; 60 struct rndis_device *rdev; 61 62 nvdev = hv_get_drvdata(ndevctx->device_ctx); 63 if (nvdev == NULL || nvdev->ndev == NULL) 64 return; 65 66 rdev = nvdev->extension; 67 if (rdev == NULL) 68 return; 69 70 if (nvdev->ndev->flags & IFF_PROMISC) 71 rndis_filter_set_packet_filter(rdev, 72 NDIS_PACKET_TYPE_PROMISCUOUS); 73 else 74 rndis_filter_set_packet_filter(rdev, 75 NDIS_PACKET_TYPE_BROADCAST | 76 NDIS_PACKET_TYPE_ALL_MULTICAST | 77 NDIS_PACKET_TYPE_DIRECTED); 78 } 79 80 static void netvsc_set_multicast_list(struct net_device *net) 81 { 82 struct net_device_context *net_device_ctx = netdev_priv(net); 83 84 schedule_work(&net_device_ctx->work); 85 } 86 87 static int netvsc_open(struct net_device *net) 88 { 89 struct net_device_context *net_device_ctx = netdev_priv(net); 90 struct hv_device *device_obj = net_device_ctx->device_ctx; 91 struct netvsc_device *nvdev; 92 struct rndis_device *rdev; 93 int ret = 0; 94 95 netif_carrier_off(net); 96 97 /* Open up the device */ 98 ret = rndis_filter_open(device_obj); 99 if (ret != 0) { 100 netdev_err(net, "unable to open device (ret %d).\n", ret); 101 return ret; 102 } 103 104 netif_start_queue(net); 105 106 nvdev = hv_get_drvdata(device_obj); 107 rdev = nvdev->extension; 108 if (!rdev->link_state) 109 netif_carrier_on(net); 110 111 return ret; 112 } 113 114 static int netvsc_close(struct net_device *net) 115 { 116 struct net_device_context *net_device_ctx = netdev_priv(net); 117 struct hv_device *device_obj = net_device_ctx->device_ctx; 118 int ret; 119 120 netif_tx_disable(net); 121 122 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */ 123 cancel_work_sync(&net_device_ctx->work); 124 ret = rndis_filter_close(device_obj); 125 if (ret != 0) 126 netdev_err(net, "unable to close device (ret %d).\n", ret); 127 128 return ret; 129 } 130 131 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size, 132 int pkt_type) 133 { 134 struct rndis_packet *rndis_pkt; 135 struct rndis_per_packet_info *ppi; 136 137 rndis_pkt = &msg->msg.pkt; 138 rndis_pkt->data_offset += ppi_size; 139 140 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt + 141 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len); 142 143 ppi->size = ppi_size; 144 ppi->type = pkt_type; 145 ppi->ppi_offset = sizeof(struct rndis_per_packet_info); 146 147 rndis_pkt->per_pkt_info_len += ppi_size; 148 149 return ppi; 150 } 151 152 static void netvsc_xmit_completion(void *context) 153 { 154 struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context; 155 struct sk_buff *skb = (struct sk_buff *) 156 (unsigned long)packet->completion.send.send_completion_tid; 157 158 kfree(packet); 159 160 if (skb) 161 dev_kfree_skb_any(skb); 162 } 163 164 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len, 165 struct hv_page_buffer *pb) 166 { 167 int j = 0; 168 169 /* Deal with compund pages by ignoring unused part 170 * of the page. 171 */ 172 page += (offset >> PAGE_SHIFT); 173 offset &= ~PAGE_MASK; 174 175 while (len > 0) { 176 unsigned long bytes; 177 178 bytes = PAGE_SIZE - offset; 179 if (bytes > len) 180 bytes = len; 181 pb[j].pfn = page_to_pfn(page); 182 pb[j].offset = offset; 183 pb[j].len = bytes; 184 185 offset += bytes; 186 len -= bytes; 187 188 if (offset == PAGE_SIZE && len) { 189 page++; 190 offset = 0; 191 j++; 192 } 193 } 194 195 return j + 1; 196 } 197 198 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb, 199 struct hv_page_buffer *pb) 200 { 201 u32 slots_used = 0; 202 char *data = skb->data; 203 int frags = skb_shinfo(skb)->nr_frags; 204 int i; 205 206 /* The packet is laid out thus: 207 * 1. hdr 208 * 2. skb linear data 209 * 3. skb fragment data 210 */ 211 if (hdr != NULL) 212 slots_used += fill_pg_buf(virt_to_page(hdr), 213 offset_in_page(hdr), 214 len, &pb[slots_used]); 215 216 slots_used += fill_pg_buf(virt_to_page(data), 217 offset_in_page(data), 218 skb_headlen(skb), &pb[slots_used]); 219 220 for (i = 0; i < frags; i++) { 221 skb_frag_t *frag = skb_shinfo(skb)->frags + i; 222 223 slots_used += fill_pg_buf(skb_frag_page(frag), 224 frag->page_offset, 225 skb_frag_size(frag), &pb[slots_used]); 226 } 227 return slots_used; 228 } 229 230 static int count_skb_frag_slots(struct sk_buff *skb) 231 { 232 int i, frags = skb_shinfo(skb)->nr_frags; 233 int pages = 0; 234 235 for (i = 0; i < frags; i++) { 236 skb_frag_t *frag = skb_shinfo(skb)->frags + i; 237 unsigned long size = skb_frag_size(frag); 238 unsigned long offset = frag->page_offset; 239 240 /* Skip unused frames from start of page */ 241 offset &= ~PAGE_MASK; 242 pages += PFN_UP(offset + size); 243 } 244 return pages; 245 } 246 247 static int netvsc_get_slots(struct sk_buff *skb) 248 { 249 char *data = skb->data; 250 unsigned int offset = offset_in_page(data); 251 unsigned int len = skb_headlen(skb); 252 int slots; 253 int frag_slots; 254 255 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE); 256 frag_slots = count_skb_frag_slots(skb); 257 return slots + frag_slots; 258 } 259 260 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off) 261 { 262 u32 ret_val = TRANSPORT_INFO_NOT_IP; 263 264 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) && 265 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) { 266 goto not_ip; 267 } 268 269 *trans_off = skb_transport_offset(skb); 270 271 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) { 272 struct iphdr *iphdr = ip_hdr(skb); 273 274 if (iphdr->protocol == IPPROTO_TCP) 275 ret_val = TRANSPORT_INFO_IPV4_TCP; 276 else if (iphdr->protocol == IPPROTO_UDP) 277 ret_val = TRANSPORT_INFO_IPV4_UDP; 278 } else { 279 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) 280 ret_val = TRANSPORT_INFO_IPV6_TCP; 281 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) 282 ret_val = TRANSPORT_INFO_IPV6_UDP; 283 } 284 285 not_ip: 286 return ret_val; 287 } 288 289 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) 290 { 291 struct net_device_context *net_device_ctx = netdev_priv(net); 292 struct hv_netvsc_packet *packet; 293 int ret; 294 unsigned int num_data_pgs; 295 struct rndis_message *rndis_msg; 296 struct rndis_packet *rndis_pkt; 297 u32 rndis_msg_size; 298 bool isvlan; 299 struct rndis_per_packet_info *ppi; 300 struct ndis_tcp_ip_checksum_info *csum_info; 301 struct ndis_tcp_lso_info *lso_info; 302 int hdr_offset; 303 u32 net_trans_info; 304 305 306 /* We will atmost need two pages to describe the rndis 307 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number 308 * of pages in a single packet. 309 */ 310 num_data_pgs = netvsc_get_slots(skb) + 2; 311 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { 312 netdev_err(net, "Packet too big: %u\n", skb->len); 313 dev_kfree_skb(skb); 314 net->stats.tx_dropped++; 315 return NETDEV_TX_OK; 316 } 317 318 /* Allocate a netvsc packet based on # of frags. */ 319 packet = kzalloc(sizeof(struct hv_netvsc_packet) + 320 (num_data_pgs * sizeof(struct hv_page_buffer)) + 321 sizeof(struct rndis_message) + 322 NDIS_VLAN_PPI_SIZE + 323 NDIS_CSUM_PPI_SIZE + 324 NDIS_LSO_PPI_SIZE, GFP_ATOMIC); 325 if (!packet) { 326 /* out of memory, drop packet */ 327 netdev_err(net, "unable to allocate hv_netvsc_packet\n"); 328 329 dev_kfree_skb(skb); 330 net->stats.tx_dropped++; 331 return NETDEV_TX_OK; 332 } 333 334 packet->vlan_tci = skb->vlan_tci; 335 336 packet->is_data_pkt = true; 337 packet->total_data_buflen = skb->len; 338 339 packet->rndis_msg = (struct rndis_message *)((unsigned long)packet + 340 sizeof(struct hv_netvsc_packet) + 341 (num_data_pgs * sizeof(struct hv_page_buffer))); 342 343 /* Set the completion routine */ 344 packet->completion.send.send_completion = netvsc_xmit_completion; 345 packet->completion.send.send_completion_ctx = packet; 346 packet->completion.send.send_completion_tid = (unsigned long)skb; 347 348 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT; 349 350 /* Add the rndis header */ 351 rndis_msg = packet->rndis_msg; 352 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET; 353 rndis_msg->msg_len = packet->total_data_buflen; 354 rndis_pkt = &rndis_msg->msg.pkt; 355 rndis_pkt->data_offset = sizeof(struct rndis_packet); 356 rndis_pkt->data_len = packet->total_data_buflen; 357 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet); 358 359 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet); 360 361 if (isvlan) { 362 struct ndis_pkt_8021q_info *vlan; 363 364 rndis_msg_size += NDIS_VLAN_PPI_SIZE; 365 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE, 366 IEEE_8021Q_INFO); 367 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi + 368 ppi->ppi_offset); 369 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK; 370 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >> 371 VLAN_PRIO_SHIFT; 372 } 373 374 net_trans_info = get_net_transport_info(skb, &hdr_offset); 375 if (net_trans_info == TRANSPORT_INFO_NOT_IP) 376 goto do_send; 377 378 /* 379 * Setup the sendside checksum offload only if this is not a 380 * GSO packet. 381 */ 382 if (skb_is_gso(skb)) 383 goto do_lso; 384 385 rndis_msg_size += NDIS_CSUM_PPI_SIZE; 386 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE, 387 TCPIP_CHKSUM_PKTINFO); 388 389 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi + 390 ppi->ppi_offset); 391 392 if (net_trans_info & (INFO_IPV4 << 16)) 393 csum_info->transmit.is_ipv4 = 1; 394 else 395 csum_info->transmit.is_ipv6 = 1; 396 397 if (net_trans_info & INFO_TCP) { 398 csum_info->transmit.tcp_checksum = 1; 399 csum_info->transmit.tcp_header_offset = hdr_offset; 400 } else if (net_trans_info & INFO_UDP) { 401 /* UDP checksum offload is not supported on ws2008r2. 402 * Furthermore, on ws2012 and ws2012r2, there are some 403 * issues with udp checksum offload from Linux guests. 404 * (these are host issues). 405 * For now compute the checksum here. 406 */ 407 struct udphdr *uh; 408 u16 udp_len; 409 410 ret = skb_cow_head(skb, 0); 411 if (ret) 412 goto drop; 413 414 uh = udp_hdr(skb); 415 udp_len = ntohs(uh->len); 416 uh->check = 0; 417 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr, 418 ip_hdr(skb)->daddr, 419 udp_len, IPPROTO_UDP, 420 csum_partial(uh, udp_len, 0)); 421 if (uh->check == 0) 422 uh->check = CSUM_MANGLED_0; 423 424 csum_info->transmit.udp_checksum = 0; 425 } 426 goto do_send; 427 428 do_lso: 429 rndis_msg_size += NDIS_LSO_PPI_SIZE; 430 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE, 431 TCP_LARGESEND_PKTINFO); 432 433 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi + 434 ppi->ppi_offset); 435 436 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE; 437 if (net_trans_info & (INFO_IPV4 << 16)) { 438 lso_info->lso_v2_transmit.ip_version = 439 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4; 440 ip_hdr(skb)->tot_len = 0; 441 ip_hdr(skb)->check = 0; 442 tcp_hdr(skb)->check = 443 ~csum_tcpudp_magic(ip_hdr(skb)->saddr, 444 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 445 } else { 446 lso_info->lso_v2_transmit.ip_version = 447 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6; 448 ipv6_hdr(skb)->payload_len = 0; 449 tcp_hdr(skb)->check = 450 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 451 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 452 } 453 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset; 454 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size; 455 456 do_send: 457 /* Start filling in the page buffers with the rndis hdr */ 458 rndis_msg->msg_len += rndis_msg_size; 459 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size, 460 skb, &packet->page_buf[0]); 461 462 ret = netvsc_send(net_device_ctx->device_ctx, packet); 463 464 drop: 465 if (ret == 0) { 466 net->stats.tx_bytes += skb->len; 467 net->stats.tx_packets++; 468 } else { 469 kfree(packet); 470 if (ret != -EAGAIN) { 471 dev_kfree_skb_any(skb); 472 net->stats.tx_dropped++; 473 } 474 } 475 476 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK; 477 } 478 479 /* 480 * netvsc_linkstatus_callback - Link up/down notification 481 */ 482 void netvsc_linkstatus_callback(struct hv_device *device_obj, 483 unsigned int status) 484 { 485 struct net_device *net; 486 struct net_device_context *ndev_ctx; 487 struct netvsc_device *net_device; 488 struct rndis_device *rdev; 489 490 net_device = hv_get_drvdata(device_obj); 491 rdev = net_device->extension; 492 493 rdev->link_state = status != 1; 494 495 net = net_device->ndev; 496 497 if (!net || net->reg_state != NETREG_REGISTERED) 498 return; 499 500 ndev_ctx = netdev_priv(net); 501 if (status == 1) { 502 schedule_delayed_work(&ndev_ctx->dwork, 0); 503 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); 504 } else { 505 schedule_delayed_work(&ndev_ctx->dwork, 0); 506 } 507 } 508 509 /* 510 * netvsc_recv_callback - Callback when we receive a packet from the 511 * "wire" on the specified device. 512 */ 513 int netvsc_recv_callback(struct hv_device *device_obj, 514 struct hv_netvsc_packet *packet, 515 struct ndis_tcp_ip_checksum_info *csum_info) 516 { 517 struct net_device *net; 518 struct sk_buff *skb; 519 520 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev; 521 if (!net || net->reg_state != NETREG_REGISTERED) { 522 packet->status = NVSP_STAT_FAIL; 523 return 0; 524 } 525 526 /* Allocate a skb - TODO direct I/O to pages? */ 527 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); 528 if (unlikely(!skb)) { 529 ++net->stats.rx_dropped; 530 packet->status = NVSP_STAT_FAIL; 531 return 0; 532 } 533 534 /* 535 * Copy to skb. This copy is needed here since the memory pointed by 536 * hv_netvsc_packet cannot be deallocated 537 */ 538 memcpy(skb_put(skb, packet->total_data_buflen), packet->data, 539 packet->total_data_buflen); 540 541 skb->protocol = eth_type_trans(skb, net); 542 if (csum_info) { 543 /* We only look at the IP checksum here. 544 * Should we be dropping the packet if checksum 545 * failed? How do we deal with other checksums - TCP/UDP? 546 */ 547 if (csum_info->receive.ip_checksum_succeeded) 548 skb->ip_summed = CHECKSUM_UNNECESSARY; 549 else 550 skb->ip_summed = CHECKSUM_NONE; 551 } 552 553 if (packet->vlan_tci & VLAN_TAG_PRESENT) 554 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 555 packet->vlan_tci); 556 557 net->stats.rx_packets++; 558 net->stats.rx_bytes += packet->total_data_buflen; 559 560 /* 561 * Pass the skb back up. Network stack will deallocate the skb when it 562 * is done. 563 * TODO - use NAPI? 564 */ 565 netif_rx(skb); 566 567 return 0; 568 } 569 570 static void netvsc_get_drvinfo(struct net_device *net, 571 struct ethtool_drvinfo *info) 572 { 573 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 574 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 575 } 576 577 static int netvsc_change_mtu(struct net_device *ndev, int mtu) 578 { 579 struct net_device_context *ndevctx = netdev_priv(ndev); 580 struct hv_device *hdev = ndevctx->device_ctx; 581 struct netvsc_device *nvdev = hv_get_drvdata(hdev); 582 struct netvsc_device_info device_info; 583 int limit = ETH_DATA_LEN; 584 585 if (nvdev == NULL || nvdev->destroy) 586 return -ENODEV; 587 588 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) 589 limit = NETVSC_MTU; 590 591 if (mtu < 68 || mtu > limit) 592 return -EINVAL; 593 594 nvdev->start_remove = true; 595 cancel_work_sync(&ndevctx->work); 596 netif_tx_disable(ndev); 597 rndis_filter_device_remove(hdev); 598 599 ndev->mtu = mtu; 600 601 ndevctx->device_ctx = hdev; 602 hv_set_drvdata(hdev, ndev); 603 device_info.ring_size = ring_size; 604 rndis_filter_device_add(hdev, &device_info); 605 netif_wake_queue(ndev); 606 607 return 0; 608 } 609 610 611 static int netvsc_set_mac_addr(struct net_device *ndev, void *p) 612 { 613 struct net_device_context *ndevctx = netdev_priv(ndev); 614 struct hv_device *hdev = ndevctx->device_ctx; 615 struct sockaddr *addr = p; 616 char save_adr[ETH_ALEN]; 617 unsigned char save_aatype; 618 int err; 619 620 memcpy(save_adr, ndev->dev_addr, ETH_ALEN); 621 save_aatype = ndev->addr_assign_type; 622 623 err = eth_mac_addr(ndev, p); 624 if (err != 0) 625 return err; 626 627 err = rndis_filter_set_device_mac(hdev, addr->sa_data); 628 if (err != 0) { 629 /* roll back to saved MAC */ 630 memcpy(ndev->dev_addr, save_adr, ETH_ALEN); 631 ndev->addr_assign_type = save_aatype; 632 } 633 634 return err; 635 } 636 637 638 static const struct ethtool_ops ethtool_ops = { 639 .get_drvinfo = netvsc_get_drvinfo, 640 .get_link = ethtool_op_get_link, 641 }; 642 643 static const struct net_device_ops device_ops = { 644 .ndo_open = netvsc_open, 645 .ndo_stop = netvsc_close, 646 .ndo_start_xmit = netvsc_start_xmit, 647 .ndo_set_rx_mode = netvsc_set_multicast_list, 648 .ndo_change_mtu = netvsc_change_mtu, 649 .ndo_validate_addr = eth_validate_addr, 650 .ndo_set_mac_address = netvsc_set_mac_addr, 651 }; 652 653 /* 654 * Send GARP packet to network peers after migrations. 655 * After Quick Migration, the network is not immediately operational in the 656 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add 657 * another netif_notify_peers() into a delayed work, otherwise GARP packet 658 * will not be sent after quick migration, and cause network disconnection. 659 * Also, we update the carrier status here. 660 */ 661 static void netvsc_link_change(struct work_struct *w) 662 { 663 struct net_device_context *ndev_ctx; 664 struct net_device *net; 665 struct netvsc_device *net_device; 666 struct rndis_device *rdev; 667 bool notify; 668 669 rtnl_lock(); 670 671 ndev_ctx = container_of(w, struct net_device_context, dwork.work); 672 net_device = hv_get_drvdata(ndev_ctx->device_ctx); 673 rdev = net_device->extension; 674 net = net_device->ndev; 675 676 if (rdev->link_state) { 677 netif_carrier_off(net); 678 notify = false; 679 } else { 680 netif_carrier_on(net); 681 notify = true; 682 } 683 684 rtnl_unlock(); 685 686 if (notify) 687 netdev_notify_peers(net); 688 } 689 690 691 static int netvsc_probe(struct hv_device *dev, 692 const struct hv_vmbus_device_id *dev_id) 693 { 694 struct net_device *net = NULL; 695 struct net_device_context *net_device_ctx; 696 struct netvsc_device_info device_info; 697 int ret; 698 699 net = alloc_etherdev(sizeof(struct net_device_context)); 700 if (!net) 701 return -ENOMEM; 702 703 netif_carrier_off(net); 704 705 net_device_ctx = netdev_priv(net); 706 net_device_ctx->device_ctx = dev; 707 hv_set_drvdata(dev, net); 708 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); 709 INIT_WORK(&net_device_ctx->work, do_set_multicast); 710 711 net->netdev_ops = &device_ops; 712 713 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM | 714 NETIF_F_TSO; 715 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM | 716 NETIF_F_IP_CSUM | NETIF_F_TSO; 717 718 SET_ETHTOOL_OPS(net, ðtool_ops); 719 SET_NETDEV_DEV(net, &dev->device); 720 721 /* Notify the netvsc driver of the new device */ 722 device_info.ring_size = ring_size; 723 ret = rndis_filter_device_add(dev, &device_info); 724 if (ret != 0) { 725 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); 726 free_netdev(net); 727 hv_set_drvdata(dev, NULL); 728 return ret; 729 } 730 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); 731 732 ret = register_netdev(net); 733 if (ret != 0) { 734 pr_err("Unable to register netdev.\n"); 735 rndis_filter_device_remove(dev); 736 free_netdev(net); 737 } else { 738 schedule_delayed_work(&net_device_ctx->dwork, 0); 739 } 740 741 return ret; 742 } 743 744 static int netvsc_remove(struct hv_device *dev) 745 { 746 struct net_device *net; 747 struct net_device_context *ndev_ctx; 748 struct netvsc_device *net_device; 749 750 net_device = hv_get_drvdata(dev); 751 net = net_device->ndev; 752 753 if (net == NULL) { 754 dev_err(&dev->device, "No net device to remove\n"); 755 return 0; 756 } 757 758 net_device->start_remove = true; 759 760 ndev_ctx = netdev_priv(net); 761 cancel_delayed_work_sync(&ndev_ctx->dwork); 762 cancel_work_sync(&ndev_ctx->work); 763 764 /* Stop outbound asap */ 765 netif_tx_disable(net); 766 767 unregister_netdev(net); 768 769 /* 770 * Call to the vsc driver to let it know that the device is being 771 * removed 772 */ 773 rndis_filter_device_remove(dev); 774 775 free_netdev(net); 776 return 0; 777 } 778 779 static const struct hv_vmbus_device_id id_table[] = { 780 /* Network guid */ 781 { HV_NIC_GUID, }, 782 { }, 783 }; 784 785 MODULE_DEVICE_TABLE(vmbus, id_table); 786 787 /* The one and only one */ 788 static struct hv_driver netvsc_drv = { 789 .name = KBUILD_MODNAME, 790 .id_table = id_table, 791 .probe = netvsc_probe, 792 .remove = netvsc_remove, 793 }; 794 795 static void __exit netvsc_drv_exit(void) 796 { 797 vmbus_driver_unregister(&netvsc_drv); 798 } 799 800 static int __init netvsc_drv_init(void) 801 { 802 if (ring_size < RING_SIZE_MIN) { 803 ring_size = RING_SIZE_MIN; 804 pr_info("Increased ring_size to %d (min allowed)\n", 805 ring_size); 806 } 807 return vmbus_driver_register(&netvsc_drv); 808 } 809 810 MODULE_LICENSE("GPL"); 811 MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); 812 813 module_init(netvsc_drv_init); 814 module_exit(netvsc_drv_exit); 815