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 +
 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, &ethtool_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);