drivers/net/hyperv/netvsc_drv.c

   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, GFP_ATOMIC);
 323         if (!packet) {
 324                 /* out of memory, drop packet */
 325                 netdev_err(net, "unable to allocate hv_netvsc_packet\n");
 326
 327                 dev_kfree_skb(skb);
 328                 net->stats.tx_dropped++;
 329                 return NETDEV_TX_OK;
 330         }
 331
 332         packet->vlan_tci = skb->vlan_tci;
 333
 334         packet->is_data_pkt = true;
 335         packet->total_data_buflen = skb->len;
 336
 337         packet->rndis_msg = (struct rndis_message *)((unsigned long)packet +
 338                                 sizeof(struct hv_netvsc_packet) +
 339                                 (num_data_pgs * sizeof(struct hv_page_buffer)));
 340
 341         /* Set the completion routine */
 342         packet->completion.send.send_completion = netvsc_xmit_completion;
 343         packet->completion.send.send_completion_ctx = packet;
 344         packet->completion.send.send_completion_tid = (unsigned long)skb;
 345
 346         isvlan = packet->vlan_tci & VLAN_TAG_PRESENT;
 347
 348         /* Add the rndis header */
 349         rndis_msg = packet->rndis_msg;
 350         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 351         rndis_msg->msg_len = packet->total_data_buflen;
 352         rndis_pkt = &rndis_msg->msg.pkt;
 353         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 354         rndis_pkt->data_len = packet->total_data_buflen;
 355         rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 356
 357         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 358
 359         if (isvlan) {
 360                 struct ndis_pkt_8021q_info *vlan;
 361
 362                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 363                 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
 364                                         IEEE_8021Q_INFO);
 365                 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
 366                                                 ppi->ppi_offset);
 367                 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK;
 368                 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >>
 369                                 VLAN_PRIO_SHIFT;
 370         }
 371
 372         net_trans_info = get_net_transport_info(skb, &hdr_offset);
 373         if (net_trans_info == TRANSPORT_INFO_NOT_IP)
 374                 goto do_send;
 375
 376         /*
 377          * Setup the sendside checksum offload only if this is not a
 378          * GSO packet.
 379          */
 380         if (skb_is_gso(skb))
 381                 goto do_lso;
 382
 383         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 384         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 385                             TCPIP_CHKSUM_PKTINFO);
 386
 387         csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 388                         ppi->ppi_offset);
 389
 390         if (net_trans_info & (INFO_IPV4 << 16))
 391                 csum_info->transmit.is_ipv4 = 1;
 392         else
 393                 csum_info->transmit.is_ipv6 = 1;
 394
 395         if (net_trans_info & INFO_TCP) {
 396                 csum_info->transmit.tcp_checksum = 1;
 397                 csum_info->transmit.tcp_header_offset = hdr_offset;
 398         } else if (net_trans_info & INFO_UDP) {
 399                 csum_info->transmit.udp_checksum = 1;
 400         }
 401         goto do_send;
 402
 403 do_lso:
 404         rndis_msg_size += NDIS_LSO_PPI_SIZE;
 405         ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
 406                             TCP_LARGESEND_PKTINFO);
 407
 408         lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
 409                         ppi->ppi_offset);
 410
 411         lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
 412         if (net_trans_info & (INFO_IPV4 << 16)) {
 413                 lso_info->lso_v2_transmit.ip_version =
 414                         NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
 415                 ip_hdr(skb)->tot_len = 0;
 416                 ip_hdr(skb)->check = 0;
 417                 tcp_hdr(skb)->check =
 418                 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 419                                    ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 420         } else {
 421                 lso_info->lso_v2_transmit.ip_version =
 422                         NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
 423                 ipv6_hdr(skb)->payload_len = 0;
 424                 tcp_hdr(skb)->check =
 425                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 426                                 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 427         }
 428         lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
 429         lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 430
 431 do_send:
 432         /* Start filling in the page buffers with the rndis hdr */
 433         rndis_msg->msg_len += rndis_msg_size;
 434         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 435                                         skb, &packet->page_buf[0]);
 436
 437         ret = netvsc_send(net_device_ctx->device_ctx, packet);
 438
 439         if (ret == 0) {
 440                 net->stats.tx_bytes += skb->len;
 441                 net->stats.tx_packets++;
 442         } else {
 443                 kfree(packet);
 444                 if (ret != -EAGAIN) {
 445                         dev_kfree_skb_any(skb);
 446                         net->stats.tx_dropped++;
 447                 }
 448         }
 449
 450         return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
 451 }
 452
 453 /*
 454  * netvsc_linkstatus_callback - Link up/down notification
 455  */
 456 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 457                                        unsigned int status)
 458 {
 459         struct net_device *net;
 460         struct net_device_context *ndev_ctx;
 461         struct netvsc_device *net_device;
 462         struct rndis_device *rdev;
 463
 464         net_device = hv_get_drvdata(device_obj);
 465         rdev = net_device->extension;
 466
 467         rdev->link_state = status != 1;
 468
 469         net = net_device->ndev;
 470
 471         if (!net || net->reg_state != NETREG_REGISTERED)
 472                 return;
 473
 474         ndev_ctx = netdev_priv(net);
 475         if (status == 1) {
 476                 schedule_delayed_work(&ndev_ctx->dwork, 0);
 477                 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
 478         } else {
 479                 schedule_delayed_work(&ndev_ctx->dwork, 0);
 480         }
 481 }
 482
 483 /*
 484  * netvsc_recv_callback -  Callback when we receive a packet from the
 485  * "wire" on the specified device.
 486  */
 487 int netvsc_recv_callback(struct hv_device *device_obj,
 488                                 struct hv_netvsc_packet *packet,
 489                                 struct ndis_tcp_ip_checksum_info *csum_info)
 490 {
 491         struct net_device *net;
 492         struct sk_buff *skb;
 493
 494         net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
 495         if (!net || net->reg_state != NETREG_REGISTERED) {
 496                 packet->status = NVSP_STAT_FAIL;
 497                 return 0;
 498         }
 499
 500         /* Allocate a skb - TODO direct I/O to pages? */
 501         skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
 502         if (unlikely(!skb)) {
 503                 ++net->stats.rx_dropped;
 504                 packet->status = NVSP_STAT_FAIL;
 505                 return 0;
 506         }
 507
 508         /*
 509          * Copy to skb. This copy is needed here since the memory pointed by
 510          * hv_netvsc_packet cannot be deallocated
 511          */
 512         memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
 513                 packet->total_data_buflen);
 514
 515         skb->protocol = eth_type_trans(skb, net);
 516         if (csum_info) {
 517                 /* We only look at the IP checksum here.
 518                  * Should we be dropping the packet if checksum
 519                  * failed? How do we deal with other checksums - TCP/UDP?
 520                  */
 521                 if (csum_info->receive.ip_checksum_succeeded)
 522                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 523                 else
 524                         skb->ip_summed = CHECKSUM_NONE;
 525         }
 526
 527         if (packet->vlan_tci & VLAN_TAG_PRESENT)
 528                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 529                                        packet->vlan_tci);
 530
 531         net->stats.rx_packets++;
 532         net->stats.rx_bytes += packet->total_data_buflen;
 533
 534         /*
 535          * Pass the skb back up. Network stack will deallocate the skb when it
 536          * is done.
 537          * TODO - use NAPI?
 538          */
 539         netif_rx(skb);
 540
 541         return 0;
 542 }
 543
 544 static void netvsc_get_drvinfo(struct net_device *net,
 545                                struct ethtool_drvinfo *info)
 546 {
 547         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 548         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 549 }
 550
 551 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 552 {
 553         struct net_device_context *ndevctx = netdev_priv(ndev);
 554         struct hv_device *hdev =  ndevctx->device_ctx;
 555         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 556         struct netvsc_device_info device_info;
 557         int limit = ETH_DATA_LEN;
 558
 559         if (nvdev == NULL || nvdev->destroy)
 560                 return -ENODEV;
 561
 562         if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
 563                 limit = NETVSC_MTU;
 564
 565         if (mtu < 68 || mtu > limit)
 566                 return -EINVAL;
 567
 568         nvdev->start_remove = true;
 569         cancel_work_sync(&ndevctx->work);
 570         netif_tx_disable(ndev);
 571         rndis_filter_device_remove(hdev);
 572
 573         ndev->mtu = mtu;
 574
 575         ndevctx->device_ctx = hdev;
 576         hv_set_drvdata(hdev, ndev);
 577         device_info.ring_size = ring_size;
 578         rndis_filter_device_add(hdev, &device_info);
 579         netif_wake_queue(ndev);
 580
 581         return 0;
 582 }
 583
 584
 585 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
 586 {
 587         struct net_device_context *ndevctx = netdev_priv(ndev);
 588         struct hv_device *hdev =  ndevctx->device_ctx;
 589         struct sockaddr *addr = p;
 590         char save_adr[ETH_ALEN];
 591         unsigned char save_aatype;
 592         int err;
 593
 594         memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
 595         save_aatype = ndev->addr_assign_type;
 596
 597         err = eth_mac_addr(ndev, p);
 598         if (err != 0)
 599                 return err;
 600
 601         err = rndis_filter_set_device_mac(hdev, addr->sa_data);
 602         if (err != 0) {
 603                 /* roll back to saved MAC */
 604                 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
 605                 ndev->addr_assign_type = save_aatype;
 606         }
 607
 608         return err;
 609 }
 610
 611
 612 static const struct ethtool_ops ethtool_ops = {
 613         .get_drvinfo    = netvsc_get_drvinfo,
 614         .get_link       = ethtool_op_get_link,
 615 };
 616
 617 static const struct net_device_ops device_ops = {
 618         .ndo_open =                     netvsc_open,
 619         .ndo_stop =                     netvsc_close,
 620         .ndo_start_xmit =               netvsc_start_xmit,
 621         .ndo_set_rx_mode =              netvsc_set_multicast_list,
 622         .ndo_change_mtu =               netvsc_change_mtu,
 623         .ndo_validate_addr =            eth_validate_addr,
 624         .ndo_set_mac_address =          netvsc_set_mac_addr,
 625 };
 626
 627 /*
 628  * Send GARP packet to network peers after migrations.
 629  * After Quick Migration, the network is not immediately operational in the
 630  * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
 631  * another netif_notify_peers() into a delayed work, otherwise GARP packet
 632  * will not be sent after quick migration, and cause network disconnection.
 633  * Also, we update the carrier status here.
 634  */
 635 static void netvsc_link_change(struct work_struct *w)
 636 {
 637         struct net_device_context *ndev_ctx;
 638         struct net_device *net;
 639         struct netvsc_device *net_device;
 640         struct rndis_device *rdev;
 641         bool notify;
 642
 643         rtnl_lock();
 644
 645         ndev_ctx = container_of(w, struct net_device_context, dwork.work);
 646         net_device = hv_get_drvdata(ndev_ctx->device_ctx);
 647         rdev = net_device->extension;
 648         net = net_device->ndev;
 649
 650         if (rdev->link_state) {
 651                 netif_carrier_off(net);
 652                 notify = false;
 653         } else {
 654                 netif_carrier_on(net);
 655                 notify = true;
 656         }
 657
 658         rtnl_unlock();
 659
 660         if (notify)
 661                 netdev_notify_peers(net);
 662 }
 663
 664
 665 static int netvsc_probe(struct hv_device *dev,
 666                         const struct hv_vmbus_device_id *dev_id)
 667 {
 668         struct net_device *net = NULL;
 669         struct net_device_context *net_device_ctx;
 670         struct netvsc_device_info device_info;
 671         int ret;
 672
 673         net = alloc_etherdev(sizeof(struct net_device_context));
 674         if (!net)
 675                 return -ENOMEM;
 676
 677         netif_carrier_off(net);
 678
 679         net_device_ctx = netdev_priv(net);
 680         net_device_ctx->device_ctx = dev;
 681         hv_set_drvdata(dev, net);
 682         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
 683         INIT_WORK(&net_device_ctx->work, do_set_multicast);
 684
 685         net->netdev_ops = &device_ops;
 686
 687         net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
 688                                 NETIF_F_TSO;
 689         net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
 690                         NETIF_F_IP_CSUM | NETIF_F_TSO;
 691
 692         SET_ETHTOOL_OPS(net, &ethtool_ops);
 693         SET_NETDEV_DEV(net, &dev->device);
 694
 695         /* Notify the netvsc driver of the new device */
 696         device_info.ring_size = ring_size;
 697         ret = rndis_filter_device_add(dev, &device_info);
 698         if (ret != 0) {
 699                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
 700                 free_netdev(net);
 701                 hv_set_drvdata(dev, NULL);
 702                 return ret;
 703         }
 704         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
 705
 706         ret = register_netdev(net);
 707         if (ret != 0) {
 708                 pr_err("Unable to register netdev.\n");
 709                 rndis_filter_device_remove(dev);
 710                 free_netdev(net);
 711         } else {
 712                 schedule_delayed_work(&net_device_ctx->dwork, 0);
 713         }
 714
 715         return ret;
 716 }
 717
 718 static int netvsc_remove(struct hv_device *dev)
 719 {
 720         struct net_device *net;
 721         struct net_device_context *ndev_ctx;
 722         struct netvsc_device *net_device;
 723
 724         net_device = hv_get_drvdata(dev);
 725         net = net_device->ndev;
 726
 727         if (net == NULL) {
 728                 dev_err(&dev->device, "No net device to remove\n");
 729                 return 0;
 730         }
 731
 732         net_device->start_remove = true;
 733
 734         ndev_ctx = netdev_priv(net);
 735         cancel_delayed_work_sync(&ndev_ctx->dwork);
 736         cancel_work_sync(&ndev_ctx->work);
 737
 738         /* Stop outbound asap */
 739         netif_tx_disable(net);
 740
 741         unregister_netdev(net);
 742
 743         /*
 744          * Call to the vsc driver to let it know that the device is being
 745          * removed
 746          */
 747         rndis_filter_device_remove(dev);
 748
 749         free_netdev(net);
 750         return 0;
 751 }
 752
 753 static const struct hv_vmbus_device_id id_table[] = {
 754         /* Network guid */
 755         { HV_NIC_GUID, },
 756         { },
 757 };
 758
 759 MODULE_DEVICE_TABLE(vmbus, id_table);
 760
 761 /* The one and only one */
 762 static struct  hv_driver netvsc_drv = {
 763         .name = KBUILD_MODNAME,
 764         .id_table = id_table,
 765         .probe = netvsc_probe,
 766         .remove = netvsc_remove,
 767 };
 768
 769 static void __exit netvsc_drv_exit(void)
 770 {
 771         vmbus_driver_unregister(&netvsc_drv);
 772 }
 773
 774 static int __init netvsc_drv_init(void)
 775 {
 776         if (ring_size < RING_SIZE_MIN) {
 777                 ring_size = RING_SIZE_MIN;
 778                 pr_info("Increased ring_size to %d (min allowed)\n",
 779                         ring_size);
 780         }
 781         return vmbus_driver_register(&netvsc_drv);
 782 }
 783
 784 MODULE_LICENSE("GPL");
 785 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
 786
 787 module_init(netvsc_drv_init);
 788 module_exit(netvsc_drv_exit);