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/pci.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/if_vlan.h>
  35 #include <linux/in.h>
  36 #include <linux/slab.h>
  37 #include <net/arp.h>
  38 #include <net/route.h>
  39 #include <net/sock.h>
  40 #include <net/pkt_sched.h>
  41
  42 #include "hyperv_net.h"
  43
  44 #define RING_SIZE_MIN 64
  45 #define LINKCHANGE_INT (2 * HZ)
  46 #define NETVSC_HW_FEATURES      (NETIF_F_RXCSUM | \
  47                                  NETIF_F_SG | \
  48                                  NETIF_F_TSO | \
  49                                  NETIF_F_TSO6 | \
  50                                  NETIF_F_HW_CSUM)
  51
  52 /* Restrict GSO size to account for NVGRE */
  53 #define NETVSC_GSO_MAX_SIZE     62768
  54
  55 static int ring_size = 128;
  56 module_param(ring_size, int, S_IRUGO);
  57 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
  58
  59 static int max_num_vrss_chns = 8;
  60
  61 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
  62                                 NETIF_MSG_LINK | NETIF_MSG_IFUP |
  63                                 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
  64                                 NETIF_MSG_TX_ERR;
  65
  66 static int debug = -1;
  67 module_param(debug, int, S_IRUGO);
  68 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  69
  70 static void do_set_multicast(struct work_struct *w)
  71 {
  72         struct net_device_context *ndevctx =
  73                 container_of(w, struct net_device_context, work);
  74         struct hv_device *device_obj = ndevctx->device_ctx;
  75         struct net_device *ndev = hv_get_drvdata(device_obj);
  76         struct netvsc_device *nvdev = ndevctx->nvdev;
  77         struct rndis_device *rdev;
  78
  79         if (!nvdev)
  80                 return;
  81
  82         rdev = nvdev->extension;
  83         if (rdev == NULL)
  84                 return;
  85
  86         if (ndev->flags & IFF_PROMISC)
  87                 rndis_filter_set_packet_filter(rdev,
  88                         NDIS_PACKET_TYPE_PROMISCUOUS);
  89         else
  90                 rndis_filter_set_packet_filter(rdev,
  91                         NDIS_PACKET_TYPE_BROADCAST |
  92                         NDIS_PACKET_TYPE_ALL_MULTICAST |
  93                         NDIS_PACKET_TYPE_DIRECTED);
  94 }
  95
  96 static void netvsc_set_multicast_list(struct net_device *net)
  97 {
  98         struct net_device_context *net_device_ctx = netdev_priv(net);
  99
 100         schedule_work(&net_device_ctx->work);
 101 }
 102
 103 static int netvsc_open(struct net_device *net)
 104 {
 105         struct netvsc_device *nvdev = net_device_to_netvsc_device(net);
 106         struct rndis_device *rdev;
 107         int ret = 0;
 108
 109         netif_carrier_off(net);
 110
 111         /* Open up the device */
 112         ret = rndis_filter_open(nvdev);
 113         if (ret != 0) {
 114                 netdev_err(net, "unable to open device (ret %d).\n", ret);
 115                 return ret;
 116         }
 117
 118         netif_tx_wake_all_queues(net);
 119
 120         rdev = nvdev->extension;
 121         if (!rdev->link_state)
 122                 netif_carrier_on(net);
 123
 124         return ret;
 125 }
 126
 127 static int netvsc_close(struct net_device *net)
 128 {
 129         struct net_device_context *net_device_ctx = netdev_priv(net);
 130         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 131         int ret;
 132         u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
 133         struct vmbus_channel *chn;
 134
 135         netif_tx_disable(net);
 136
 137         /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
 138         cancel_work_sync(&net_device_ctx->work);
 139         ret = rndis_filter_close(nvdev);
 140         if (ret != 0) {
 141                 netdev_err(net, "unable to close device (ret %d).\n", ret);
 142                 return ret;
 143         }
 144
 145         /* Ensure pending bytes in ring are read */
 146         while (true) {
 147                 aread = 0;
 148                 for (i = 0; i < nvdev->num_chn; i++) {
 149                         chn = nvdev->chn_table[i];
 150                         if (!chn)
 151                                 continue;
 152
 153                         hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
 154                                                      &awrite);
 155
 156                         if (aread)
 157                                 break;
 158
 159                         hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
 160                                                      &awrite);
 161
 162                         if (aread)
 163                                 break;
 164                 }
 165
 166                 retry++;
 167                 if (retry > retry_max || aread == 0)
 168                         break;
 169
 170                 msleep(msec);
 171
 172                 if (msec < 1000)
 173                         msec *= 2;
 174         }
 175
 176         if (aread) {
 177                 netdev_err(net, "Ring buffer not empty after closing rndis\n");
 178                 ret = -ETIMEDOUT;
 179         }
 180
 181         return ret;
 182 }
 183
 184 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
 185                                 int pkt_type)
 186 {
 187         struct rndis_packet *rndis_pkt;
 188         struct rndis_per_packet_info *ppi;
 189
 190         rndis_pkt = &msg->msg.pkt;
 191         rndis_pkt->data_offset += ppi_size;
 192
 193         ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
 194                 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
 195
 196         ppi->size = ppi_size;
 197         ppi->type = pkt_type;
 198         ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 199
 200         rndis_pkt->per_pkt_info_len += ppi_size;
 201
 202         return ppi;
 203 }
 204
 205 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
 206                         void *accel_priv, select_queue_fallback_t fallback)
 207 {
 208         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 209         struct netvsc_device *nvsc_dev = net_device_ctx->nvdev;
 210         u32 hash;
 211         u16 q_idx = 0;
 212
 213         if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
 214                 return 0;
 215
 216         hash = skb_get_hash(skb);
 217         q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
 218                 ndev->real_num_tx_queues;
 219
 220         if (!nvsc_dev->chn_table[q_idx])
 221                 q_idx = 0;
 222
 223         return q_idx;
 224 }
 225
 226 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
 227                         struct hv_page_buffer *pb)
 228 {
 229         int j = 0;
 230
 231         /* Deal with compund pages by ignoring unused part
 232          * of the page.
 233          */
 234         page += (offset >> PAGE_SHIFT);
 235         offset &= ~PAGE_MASK;
 236
 237         while (len > 0) {
 238                 unsigned long bytes;
 239
 240                 bytes = PAGE_SIZE - offset;
 241                 if (bytes > len)
 242                         bytes = len;
 243                 pb[j].pfn = page_to_pfn(page);
 244                 pb[j].offset = offset;
 245                 pb[j].len = bytes;
 246
 247                 offset += bytes;
 248                 len -= bytes;
 249
 250                 if (offset == PAGE_SIZE && len) {
 251                         page++;
 252                         offset = 0;
 253                         j++;
 254                 }
 255         }
 256
 257         return j + 1;
 258 }
 259
 260 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
 261                            struct hv_netvsc_packet *packet,
 262                            struct hv_page_buffer **page_buf)
 263 {
 264         struct hv_page_buffer *pb = *page_buf;
 265         u32 slots_used = 0;
 266         char *data = skb->data;
 267         int frags = skb_shinfo(skb)->nr_frags;
 268         int i;
 269
 270         /* The packet is laid out thus:
 271          * 1. hdr: RNDIS header and PPI
 272          * 2. skb linear data
 273          * 3. skb fragment data
 274          */
 275         if (hdr != NULL)
 276                 slots_used += fill_pg_buf(virt_to_page(hdr),
 277                                         offset_in_page(hdr),
 278                                         len, &pb[slots_used]);
 279
 280         packet->rmsg_size = len;
 281         packet->rmsg_pgcnt = slots_used;
 282
 283         slots_used += fill_pg_buf(virt_to_page(data),
 284                                 offset_in_page(data),
 285                                 skb_headlen(skb), &pb[slots_used]);
 286
 287         for (i = 0; i < frags; i++) {
 288                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 289
 290                 slots_used += fill_pg_buf(skb_frag_page(frag),
 291                                         frag->page_offset,
 292                                         skb_frag_size(frag), &pb[slots_used]);
 293         }
 294         return slots_used;
 295 }
 296
 297 static int count_skb_frag_slots(struct sk_buff *skb)
 298 {
 299         int i, frags = skb_shinfo(skb)->nr_frags;
 300         int pages = 0;
 301
 302         for (i = 0; i < frags; i++) {
 303                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 304                 unsigned long size = skb_frag_size(frag);
 305                 unsigned long offset = frag->page_offset;
 306
 307                 /* Skip unused frames from start of page */
 308                 offset &= ~PAGE_MASK;
 309                 pages += PFN_UP(offset + size);
 310         }
 311         return pages;
 312 }
 313
 314 static int netvsc_get_slots(struct sk_buff *skb)
 315 {
 316         char *data = skb->data;
 317         unsigned int offset = offset_in_page(data);
 318         unsigned int len = skb_headlen(skb);
 319         int slots;
 320         int frag_slots;
 321
 322         slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
 323         frag_slots = count_skb_frag_slots(skb);
 324         return slots + frag_slots;
 325 }
 326
 327 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
 328 {
 329         u32 ret_val = TRANSPORT_INFO_NOT_IP;
 330
 331         if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
 332                 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
 333                 goto not_ip;
 334         }
 335
 336         *trans_off = skb_transport_offset(skb);
 337
 338         if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
 339                 struct iphdr *iphdr = ip_hdr(skb);
 340
 341                 if (iphdr->protocol == IPPROTO_TCP)
 342                         ret_val = TRANSPORT_INFO_IPV4_TCP;
 343                 else if (iphdr->protocol == IPPROTO_UDP)
 344                         ret_val = TRANSPORT_INFO_IPV4_UDP;
 345         } else {
 346                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
 347                         ret_val = TRANSPORT_INFO_IPV6_TCP;
 348                 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
 349                         ret_val = TRANSPORT_INFO_IPV6_UDP;
 350         }
 351
 352 not_ip:
 353         return ret_val;
 354 }
 355
 356 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 357 {
 358         struct net_device_context *net_device_ctx = netdev_priv(net);
 359         struct hv_netvsc_packet *packet = NULL;
 360         int ret;
 361         unsigned int num_data_pgs;
 362         struct rndis_message *rndis_msg;
 363         struct rndis_packet *rndis_pkt;
 364         u32 rndis_msg_size;
 365         struct rndis_per_packet_info *ppi;
 366         struct ndis_tcp_ip_checksum_info *csum_info;
 367         int  hdr_offset;
 368         u32 net_trans_info;
 369         u32 hash;
 370         u32 skb_length;
 371         struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
 372         struct hv_page_buffer *pb = page_buf;
 373
 374         /* We will atmost need two pages to describe the rndis
 375          * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
 376          * of pages in a single packet. If skb is scattered around
 377          * more pages we try linearizing it.
 378          */
 379
 380         skb_length = skb->len;
 381         num_data_pgs = netvsc_get_slots(skb) + 2;
 382
 383         if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
 384                 ++net_device_ctx->eth_stats.tx_scattered;
 385
 386                 if (skb_linearize(skb))
 387                         goto no_memory;
 388
 389                 num_data_pgs = netvsc_get_slots(skb) + 2;
 390                 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
 391                         ++net_device_ctx->eth_stats.tx_too_big;
 392                         goto drop;
 393                 }
 394         }
 395
 396         /*
 397          * Place the rndis header in the skb head room and
 398          * the skb->cb will be used for hv_netvsc_packet
 399          * structure.
 400          */
 401         ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
 402         if (ret)
 403                 goto no_memory;
 404
 405         /* Use the skb control buffer for building up the packet */
 406         BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
 407                         FIELD_SIZEOF(struct sk_buff, cb));
 408         packet = (struct hv_netvsc_packet *)skb->cb;
 409
 410         packet->q_idx = skb_get_queue_mapping(skb);
 411
 412         packet->total_data_buflen = skb->len;
 413
 414         rndis_msg = (struct rndis_message *)skb->head;
 415
 416         memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
 417
 418         /* Add the rndis header */
 419         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 420         rndis_msg->msg_len = packet->total_data_buflen;
 421         rndis_pkt = &rndis_msg->msg.pkt;
 422         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 423         rndis_pkt->data_len = packet->total_data_buflen;
 424         rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 425
 426         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 427
 428         hash = skb_get_hash_raw(skb);
 429         if (hash != 0 && net->real_num_tx_queues > 1) {
 430                 rndis_msg_size += NDIS_HASH_PPI_SIZE;
 431                 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
 432                                     NBL_HASH_VALUE);
 433                 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
 434         }
 435
 436         if (skb_vlan_tag_present(skb)) {
 437                 struct ndis_pkt_8021q_info *vlan;
 438
 439                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 440                 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
 441                                         IEEE_8021Q_INFO);
 442                 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
 443                                                 ppi->ppi_offset);
 444                 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
 445                 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
 446                                 VLAN_PRIO_SHIFT;
 447         }
 448
 449         net_trans_info = get_net_transport_info(skb, &hdr_offset);
 450
 451         /*
 452          * Setup the sendside checksum offload only if this is not a
 453          * GSO packet.
 454          */
 455         if ((net_trans_info & (INFO_TCP | INFO_UDP)) && skb_is_gso(skb)) {
 456                 struct ndis_tcp_lso_info *lso_info;
 457
 458                 rndis_msg_size += NDIS_LSO_PPI_SIZE;
 459                 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
 460                                     TCP_LARGESEND_PKTINFO);
 461
 462                 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
 463                                                         ppi->ppi_offset);
 464
 465                 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
 466                 if (net_trans_info & (INFO_IPV4 << 16)) {
 467                         lso_info->lso_v2_transmit.ip_version =
 468                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
 469                         ip_hdr(skb)->tot_len = 0;
 470                         ip_hdr(skb)->check = 0;
 471                         tcp_hdr(skb)->check =
 472                                 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 473                                                    ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 474                 } else {
 475                         lso_info->lso_v2_transmit.ip_version =
 476                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
 477                         ipv6_hdr(skb)->payload_len = 0;
 478                         tcp_hdr(skb)->check =
 479                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 480                                                  &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 481                 }
 482                 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
 483                 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 484         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 485                 if (net_trans_info & INFO_TCP) {
 486                         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 487                         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 488                                             TCPIP_CHKSUM_PKTINFO);
 489
 490                         csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 491                                                                          ppi->ppi_offset);
 492
 493                         if (net_trans_info & (INFO_IPV4 << 16))
 494                                 csum_info->transmit.is_ipv4 = 1;
 495                         else
 496                                 csum_info->transmit.is_ipv6 = 1;
 497
 498                         csum_info->transmit.tcp_checksum = 1;
 499                         csum_info->transmit.tcp_header_offset = hdr_offset;
 500                 } else {
 501                         /* UDP checksum (and other) offload is not supported. */
 502                         if (skb_checksum_help(skb))
 503                                 goto drop;
 504                 }
 505         }
 506
 507         /* Start filling in the page buffers with the rndis hdr */
 508         rndis_msg->msg_len += rndis_msg_size;
 509         packet->total_data_buflen = rndis_msg->msg_len;
 510         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 511                                                skb, packet, &pb);
 512
 513         /* timestamp packet in software */
 514         skb_tx_timestamp(skb);
 515         ret = netvsc_send(net_device_ctx->device_ctx, packet,
 516                           rndis_msg, &pb, skb);
 517         if (likely(ret == 0)) {
 518                 struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats);
 519
 520                 u64_stats_update_begin(&tx_stats->syncp);
 521                 tx_stats->packets++;
 522                 tx_stats->bytes += skb_length;
 523                 u64_stats_update_end(&tx_stats->syncp);
 524                 return NETDEV_TX_OK;
 525         }
 526
 527         if (ret == -EAGAIN) {
 528                 ++net_device_ctx->eth_stats.tx_busy;
 529                 return NETDEV_TX_BUSY;
 530         }
 531
 532         if (ret == -ENOSPC)
 533                 ++net_device_ctx->eth_stats.tx_no_space;
 534
 535 drop:
 536         dev_kfree_skb_any(skb);
 537         net->stats.tx_dropped++;
 538
 539         return NETDEV_TX_OK;
 540
 541 no_memory:
 542         ++net_device_ctx->eth_stats.tx_no_memory;
 543         goto drop;
 544 }
 545
 546 /*
 547  * netvsc_linkstatus_callback - Link up/down notification
 548  */
 549 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 550                                 struct rndis_message *resp)
 551 {
 552         struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
 553         struct net_device *net;
 554         struct net_device_context *ndev_ctx;
 555         struct netvsc_reconfig *event;
 556         unsigned long flags;
 557
 558         net = hv_get_drvdata(device_obj);
 559
 560         if (!net)
 561                 return;
 562
 563         ndev_ctx = netdev_priv(net);
 564
 565         /* Update the physical link speed when changing to another vSwitch */
 566         if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
 567                 u32 speed;
 568
 569                 speed = *(u32 *)((void *)indicate + indicate->
 570                                  status_buf_offset) / 10000;
 571                 ndev_ctx->speed = speed;
 572                 return;
 573         }
 574
 575         /* Handle these link change statuses below */
 576         if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
 577             indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
 578             indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
 579                 return;
 580
 581         if (net->reg_state != NETREG_REGISTERED)
 582                 return;
 583
 584         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 585         if (!event)
 586                 return;
 587         event->event = indicate->status;
 588
 589         spin_lock_irqsave(&ndev_ctx->lock, flags);
 590         list_add_tail(&event->list, &ndev_ctx->reconfig_events);
 591         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
 592
 593         schedule_delayed_work(&ndev_ctx->dwork, 0);
 594 }
 595
 596 static void netvsc_comp_ipcsum(struct sk_buff *skb)
 597 {
 598         struct iphdr *iph = (struct iphdr *)skb->data;
 599
 600         iph->check = 0;
 601         iph->check = ip_fast_csum(iph, iph->ihl);
 602 }
 603
 604 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 605                                 struct hv_netvsc_packet *packet,
 606                                 struct ndis_tcp_ip_checksum_info *csum_info,
 607                                 void *data, u16 vlan_tci)
 608 {
 609         struct sk_buff *skb;
 610
 611         skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
 612         if (!skb)
 613                 return skb;
 614
 615         /*
 616          * Copy to skb. This copy is needed here since the memory pointed by
 617          * hv_netvsc_packet cannot be deallocated
 618          */
 619         memcpy(skb_put(skb, packet->total_data_buflen), data,
 620                packet->total_data_buflen);
 621
 622         skb->protocol = eth_type_trans(skb, net);
 623
 624         /* skb is already created with CHECKSUM_NONE */
 625         skb_checksum_none_assert(skb);
 626
 627         /* Incoming packets may have IP header checksum verified by the host.
 628          * They may not have IP header checksum computed after coalescing.
 629          * We compute it here if the flags are set, because on Linux, the IP
 630          * checksum is always checked.
 631          */
 632         if (csum_info && csum_info->receive.ip_checksum_value_invalid &&
 633             csum_info->receive.ip_checksum_succeeded &&
 634             skb->protocol == htons(ETH_P_IP))
 635                 netvsc_comp_ipcsum(skb);
 636
 637         /* Do L4 checksum offload if enabled and present.
 638          */
 639         if (csum_info && (net->features & NETIF_F_RXCSUM)) {
 640                 if (csum_info->receive.tcp_checksum_succeeded ||
 641                     csum_info->receive.udp_checksum_succeeded)
 642                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 643         }
 644
 645         if (vlan_tci & VLAN_TAG_PRESENT)
 646                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 647                                        vlan_tci);
 648
 649         return skb;
 650 }
 651
 652 /*
 653  * netvsc_recv_callback -  Callback when we receive a packet from the
 654  * "wire" on the specified device.
 655  */
 656 int netvsc_recv_callback(struct hv_device *device_obj,
 657                                 struct hv_netvsc_packet *packet,
 658                                 void **data,
 659                                 struct ndis_tcp_ip_checksum_info *csum_info,
 660                                 struct vmbus_channel *channel,
 661                                 u16 vlan_tci)
 662 {
 663         struct net_device *net = hv_get_drvdata(device_obj);
 664         struct net_device_context *net_device_ctx = netdev_priv(net);
 665         struct net_device *vf_netdev;
 666         struct sk_buff *skb;
 667         struct netvsc_stats *rx_stats;
 668
 669         if (net->reg_state != NETREG_REGISTERED)
 670                 return NVSP_STAT_FAIL;
 671
 672         /*
 673          * If necessary, inject this packet into the VF interface.
 674          * On Hyper-V, multicast and brodcast packets are only delivered
 675          * to the synthetic interface (after subjecting these to
 676          * policy filters on the host). Deliver these via the VF
 677          * interface in the guest.
 678          */
 679         rcu_read_lock();
 680         vf_netdev = rcu_dereference(net_device_ctx->vf_netdev);
 681         if (vf_netdev && (vf_netdev->flags & IFF_UP))
 682                 net = vf_netdev;
 683
 684         /* Allocate a skb - TODO direct I/O to pages? */
 685         skb = netvsc_alloc_recv_skb(net, packet, csum_info, *data, vlan_tci);
 686         if (unlikely(!skb)) {
 687                 ++net->stats.rx_dropped;
 688                 rcu_read_unlock();
 689                 return NVSP_STAT_FAIL;
 690         }
 691
 692         if (net != vf_netdev)
 693                 skb_record_rx_queue(skb,
 694                                     channel->offermsg.offer.sub_channel_index);
 695
 696         /*
 697          * Even if injecting the packet, record the statistics
 698          * on the synthetic device because modifying the VF device
 699          * statistics will not work correctly.
 700          */
 701         rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
 702         u64_stats_update_begin(&rx_stats->syncp);
 703         rx_stats->packets++;
 704         rx_stats->bytes += packet->total_data_buflen;
 705
 706         if (skb->pkt_type == PACKET_BROADCAST)
 707                 ++rx_stats->broadcast;
 708         else if (skb->pkt_type == PACKET_MULTICAST)
 709                 ++rx_stats->multicast;
 710         u64_stats_update_end(&rx_stats->syncp);
 711
 712         /*
 713          * Pass the skb back up. Network stack will deallocate the skb when it
 714          * is done.
 715          * TODO - use NAPI?
 716          */
 717         netif_rx(skb);
 718         rcu_read_unlock();
 719
 720         return 0;
 721 }
 722
 723 static void netvsc_get_drvinfo(struct net_device *net,
 724                                struct ethtool_drvinfo *info)
 725 {
 726         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 727         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 728 }
 729
 730 static void netvsc_get_channels(struct net_device *net,
 731                                 struct ethtool_channels *channel)
 732 {
 733         struct net_device_context *net_device_ctx = netdev_priv(net);
 734         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 735
 736         if (nvdev) {
 737                 channel->max_combined   = nvdev->max_chn;
 738                 channel->combined_count = nvdev->num_chn;
 739         }
 740 }
 741
 742 static int netvsc_set_channels(struct net_device *net,
 743                                struct ethtool_channels *channels)
 744 {
 745         struct net_device_context *net_device_ctx = netdev_priv(net);
 746         struct hv_device *dev = net_device_ctx->device_ctx;
 747         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 748         struct netvsc_device_info device_info;
 749         u32 num_chn;
 750         u32 max_chn;
 751         int ret = 0;
 752         bool recovering = false;
 753
 754         if (net_device_ctx->start_remove || !nvdev || nvdev->destroy)
 755                 return -ENODEV;
 756
 757         num_chn = nvdev->num_chn;
 758         max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
 759
 760         if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) {
 761                 pr_info("vRSS unsupported before NVSP Version 5\n");
 762                 return -EINVAL;
 763         }
 764
 765         /* We do not support rx, tx, or other */
 766         if (!channels ||
 767             channels->rx_count ||
 768             channels->tx_count ||
 769             channels->other_count ||
 770             (channels->combined_count < 1))
 771                 return -EINVAL;
 772
 773         if (channels->combined_count > max_chn) {
 774                 pr_info("combined channels too high, using %d\n", max_chn);
 775                 channels->combined_count = max_chn;
 776         }
 777
 778         ret = netvsc_close(net);
 779         if (ret)
 780                 goto out;
 781
 782  do_set:
 783         net_device_ctx->start_remove = true;
 784         rndis_filter_device_remove(dev);
 785
 786         nvdev->num_chn = channels->combined_count;
 787
 788         memset(&device_info, 0, sizeof(device_info));
 789         device_info.num_chn = nvdev->num_chn; /* passed to RNDIS */
 790         device_info.ring_size = ring_size;
 791         device_info.max_num_vrss_chns = max_num_vrss_chns;
 792
 793         ret = rndis_filter_device_add(dev, &device_info);
 794         if (ret) {
 795                 if (recovering) {
 796                         netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
 797                         return ret;
 798                 }
 799                 goto recover;
 800         }
 801
 802         nvdev = net_device_ctx->nvdev;
 803
 804         ret = netif_set_real_num_tx_queues(net, nvdev->num_chn);
 805         if (ret) {
 806                 if (recovering) {
 807                         netdev_err(net, "could not set tx queue count (ret %d)\n", ret);
 808                         return ret;
 809                 }
 810                 goto recover;
 811         }
 812
 813         ret = netif_set_real_num_rx_queues(net, nvdev->num_chn);
 814         if (ret) {
 815                 if (recovering) {
 816                         netdev_err(net, "could not set rx queue count (ret %d)\n", ret);
 817                         return ret;
 818                 }
 819                 goto recover;
 820         }
 821
 822  out:
 823         netvsc_open(net);
 824         net_device_ctx->start_remove = false;
 825         /* We may have missed link change notifications */
 826         schedule_delayed_work(&net_device_ctx->dwork, 0);
 827
 828         return ret;
 829
 830  recover:
 831         /* If the above failed, we attempt to recover through the same
 832          * process but with the original number of channels.
 833          */
 834         netdev_err(net, "could not set channels, recovering\n");
 835         recovering = true;
 836         channels->combined_count = num_chn;
 837         goto do_set;
 838 }
 839
 840 static bool netvsc_validate_ethtool_ss_cmd(const struct ethtool_cmd *cmd)
 841 {
 842         struct ethtool_cmd diff1 = *cmd;
 843         struct ethtool_cmd diff2 = {};
 844
 845         ethtool_cmd_speed_set(&diff1, 0);
 846         diff1.duplex = 0;
 847         /* advertising and cmd are usually set */
 848         diff1.advertising = 0;
 849         diff1.cmd = 0;
 850         /* We set port to PORT_OTHER */
 851         diff2.port = PORT_OTHER;
 852
 853         return !memcmp(&diff1, &diff2, sizeof(diff1));
 854 }
 855
 856 static void netvsc_init_settings(struct net_device *dev)
 857 {
 858         struct net_device_context *ndc = netdev_priv(dev);
 859
 860         ndc->speed = SPEED_UNKNOWN;
 861         ndc->duplex = DUPLEX_UNKNOWN;
 862 }
 863
 864 static int netvsc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 865 {
 866         struct net_device_context *ndc = netdev_priv(dev);
 867
 868         ethtool_cmd_speed_set(cmd, ndc->speed);
 869         cmd->duplex = ndc->duplex;
 870         cmd->port = PORT_OTHER;
 871
 872         return 0;
 873 }
 874
 875 static int netvsc_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 876 {
 877         struct net_device_context *ndc = netdev_priv(dev);
 878         u32 speed;
 879
 880         speed = ethtool_cmd_speed(cmd);
 881         if (!ethtool_validate_speed(speed) ||
 882             !ethtool_validate_duplex(cmd->duplex) ||
 883             !netvsc_validate_ethtool_ss_cmd(cmd))
 884                 return -EINVAL;
 885
 886         ndc->speed = speed;
 887         ndc->duplex = cmd->duplex;
 888
 889         return 0;
 890 }
 891
 892 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 893 {
 894         struct net_device_context *ndevctx = netdev_priv(ndev);
 895         struct netvsc_device *nvdev = ndevctx->nvdev;
 896         struct hv_device *hdev = ndevctx->device_ctx;
 897         struct netvsc_device_info device_info;
 898         int limit = ETH_DATA_LEN;
 899         u32 num_chn;
 900         int ret = 0;
 901
 902         if (ndevctx->start_remove || !nvdev || nvdev->destroy)
 903                 return -ENODEV;
 904
 905         if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
 906                 limit = NETVSC_MTU - ETH_HLEN;
 907
 908         if (mtu < NETVSC_MTU_MIN || mtu > limit)
 909                 return -EINVAL;
 910
 911         ret = netvsc_close(ndev);
 912         if (ret)
 913                 goto out;
 914
 915         num_chn = nvdev->num_chn;
 916
 917         ndevctx->start_remove = true;
 918         rndis_filter_device_remove(hdev);
 919
 920         ndev->mtu = mtu;
 921
 922         memset(&device_info, 0, sizeof(device_info));
 923         device_info.ring_size = ring_size;
 924         device_info.num_chn = num_chn;
 925         device_info.max_num_vrss_chns = max_num_vrss_chns;
 926         rndis_filter_device_add(hdev, &device_info);
 927
 928 out:
 929         netvsc_open(ndev);
 930         ndevctx->start_remove = false;
 931
 932         /* We may have missed link change notifications */
 933         schedule_delayed_work(&ndevctx->dwork, 0);
 934
 935         return ret;
 936 }
 937
 938 static struct rtnl_link_stats64 *netvsc_get_stats64(struct net_device *net,
 939                                                     struct rtnl_link_stats64 *t)
 940 {
 941         struct net_device_context *ndev_ctx = netdev_priv(net);
 942         int cpu;
 943
 944         for_each_possible_cpu(cpu) {
 945                 struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats,
 946                                                             cpu);
 947                 struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats,
 948                                                             cpu);
 949                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes, rx_multicast;
 950                 unsigned int start;
 951
 952                 do {
 953                         start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
 954                         tx_packets = tx_stats->packets;
 955                         tx_bytes = tx_stats->bytes;
 956                 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
 957
 958                 do {
 959                         start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
 960                         rx_packets = rx_stats->packets;
 961                         rx_bytes = rx_stats->bytes;
 962                         rx_multicast = rx_stats->multicast + rx_stats->broadcast;
 963                 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
 964
 965                 t->tx_bytes     += tx_bytes;
 966                 t->tx_packets   += tx_packets;
 967                 t->rx_bytes     += rx_bytes;
 968                 t->rx_packets   += rx_packets;
 969                 t->multicast    += rx_multicast;
 970         }
 971
 972         t->tx_dropped   = net->stats.tx_dropped;
 973         t->tx_errors    = net->stats.tx_dropped;
 974
 975         t->rx_dropped   = net->stats.rx_dropped;
 976         t->rx_errors    = net->stats.rx_errors;
 977
 978         return t;
 979 }
 980
 981 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
 982 {
 983         struct sockaddr *addr = p;
 984         char save_adr[ETH_ALEN];
 985         unsigned char save_aatype;
 986         int err;
 987
 988         memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
 989         save_aatype = ndev->addr_assign_type;
 990
 991         err = eth_mac_addr(ndev, p);
 992         if (err != 0)
 993                 return err;
 994
 995         err = rndis_filter_set_device_mac(ndev, addr->sa_data);
 996         if (err != 0) {
 997                 /* roll back to saved MAC */
 998                 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
 999                 ndev->addr_assign_type = save_aatype;
1000         }
1001
1002         return err;
1003 }
1004
1005 static const struct {
1006         char name[ETH_GSTRING_LEN];
1007         u16 offset;
1008 } netvsc_stats[] = {
1009         { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
1010         { "tx_no_memory",  offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
1011         { "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },
1012         { "tx_too_big",   offsetof(struct netvsc_ethtool_stats, tx_too_big) },
1013         { "tx_busy",      offsetof(struct netvsc_ethtool_stats, tx_busy) },
1014 };
1015
1016 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
1017 {
1018         switch (string_set) {
1019         case ETH_SS_STATS:
1020                 return ARRAY_SIZE(netvsc_stats);
1021         default:
1022                 return -EINVAL;
1023         }
1024 }
1025
1026 static void netvsc_get_ethtool_stats(struct net_device *dev,
1027                                      struct ethtool_stats *stats, u64 *data)
1028 {
1029         struct net_device_context *ndc = netdev_priv(dev);
1030         const void *nds = &ndc->eth_stats;
1031         int i;
1032
1033         for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)
1034                 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1035 }
1036
1037 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1038 {
1039         int i;
1040
1041         switch (stringset) {
1042         case ETH_SS_STATS:
1043                 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)
1044                         memcpy(data + i * ETH_GSTRING_LEN,
1045                                netvsc_stats[i].name, ETH_GSTRING_LEN);
1046                 break;
1047         }
1048 }
1049
1050 #ifdef CONFIG_NET_POLL_CONTROLLER
1051 static void netvsc_poll_controller(struct net_device *net)
1052 {
1053         /* As netvsc_start_xmit() works synchronous we don't have to
1054          * trigger anything here.
1055          */
1056 }
1057 #endif
1058
1059 static const struct ethtool_ops ethtool_ops = {
1060         .get_drvinfo    = netvsc_get_drvinfo,
1061         .get_link       = ethtool_op_get_link,
1062         .get_ethtool_stats = netvsc_get_ethtool_stats,
1063         .get_sset_count = netvsc_get_sset_count,
1064         .get_strings    = netvsc_get_strings,
1065         .get_channels   = netvsc_get_channels,
1066         .set_channels   = netvsc_set_channels,
1067         .get_ts_info    = ethtool_op_get_ts_info,
1068         .get_settings   = netvsc_get_settings,
1069         .set_settings   = netvsc_set_settings,
1070 };
1071
1072 static const struct net_device_ops device_ops = {
1073         .ndo_open =                     netvsc_open,
1074         .ndo_stop =                     netvsc_close,
1075         .ndo_start_xmit =               netvsc_start_xmit,
1076         .ndo_set_rx_mode =              netvsc_set_multicast_list,
1077         .ndo_change_mtu =               netvsc_change_mtu,
1078         .ndo_validate_addr =            eth_validate_addr,
1079         .ndo_set_mac_address =          netvsc_set_mac_addr,
1080         .ndo_select_queue =             netvsc_select_queue,
1081         .ndo_get_stats64 =              netvsc_get_stats64,
1082 #ifdef CONFIG_NET_POLL_CONTROLLER
1083         .ndo_poll_controller =          netvsc_poll_controller,
1084 #endif
1085 };
1086
1087 /*
1088  * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1089  * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1090  * present send GARP packet to network peers with netif_notify_peers().
1091  */
1092 static void netvsc_link_change(struct work_struct *w)
1093 {
1094         struct net_device_context *ndev_ctx =
1095                 container_of(w, struct net_device_context, dwork.work);
1096         struct hv_device *device_obj = ndev_ctx->device_ctx;
1097         struct net_device *net = hv_get_drvdata(device_obj);
1098         struct netvsc_device *net_device;
1099         struct rndis_device *rdev;
1100         struct netvsc_reconfig *event = NULL;
1101         bool notify = false, reschedule = false;
1102         unsigned long flags, next_reconfig, delay;
1103
1104         /* if changes are happening, comeback later */
1105         if (!rtnl_trylock()) {
1106                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1107                 return;
1108         }
1109
1110         if (ndev_ctx->start_remove)
1111                 goto out_unlock;
1112
1113         net_device = ndev_ctx->nvdev;
1114         rdev = net_device->extension;
1115
1116         next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1117         if (time_is_after_jiffies(next_reconfig)) {
1118                 /* link_watch only sends one notification with current state
1119                  * per second, avoid doing reconfig more frequently. Handle
1120                  * wrap around.
1121                  */
1122                 delay = next_reconfig - jiffies;
1123                 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1124                 schedule_delayed_work(&ndev_ctx->dwork, delay);
1125                 goto out_unlock;
1126         }
1127         ndev_ctx->last_reconfig = jiffies;
1128
1129         spin_lock_irqsave(&ndev_ctx->lock, flags);
1130         if (!list_empty(&ndev_ctx->reconfig_events)) {
1131                 event = list_first_entry(&ndev_ctx->reconfig_events,
1132                                          struct netvsc_reconfig, list);
1133                 list_del(&event->list);
1134                 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1135         }
1136         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1137
1138         if (!event)
1139                 goto out_unlock;
1140
1141         switch (event->event) {
1142                 /* Only the following events are possible due to the check in
1143                  * netvsc_linkstatus_callback()
1144                  */
1145         case RNDIS_STATUS_MEDIA_CONNECT:
1146                 if (rdev->link_state) {
1147                         rdev->link_state = false;
1148                         netif_carrier_on(net);
1149                         netif_tx_wake_all_queues(net);
1150                 } else {
1151                         notify = true;
1152                 }
1153                 kfree(event);
1154                 break;
1155         case RNDIS_STATUS_MEDIA_DISCONNECT:
1156                 if (!rdev->link_state) {
1157                         rdev->link_state = true;
1158                         netif_carrier_off(net);
1159                         netif_tx_stop_all_queues(net);
1160                 }
1161                 kfree(event);
1162                 break;
1163         case RNDIS_STATUS_NETWORK_CHANGE:
1164                 /* Only makes sense if carrier is present */
1165                 if (!rdev->link_state) {
1166                         rdev->link_state = true;
1167                         netif_carrier_off(net);
1168                         netif_tx_stop_all_queues(net);
1169                         event->event = RNDIS_STATUS_MEDIA_CONNECT;
1170                         spin_lock_irqsave(&ndev_ctx->lock, flags);
1171                         list_add(&event->list, &ndev_ctx->reconfig_events);
1172                         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1173                         reschedule = true;
1174                 }
1175                 break;
1176         }
1177
1178         rtnl_unlock();
1179
1180         if (notify)
1181                 netdev_notify_peers(net);
1182
1183         /* link_watch only sends one notification with current state per
1184          * second, handle next reconfig event in 2 seconds.
1185          */
1186         if (reschedule)
1187                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1188
1189         return;
1190
1191 out_unlock:
1192         rtnl_unlock();
1193 }
1194
1195 static void netvsc_free_netdev(struct net_device *netdev)
1196 {
1197         struct net_device_context *net_device_ctx = netdev_priv(netdev);
1198
1199         free_percpu(net_device_ctx->tx_stats);
1200         free_percpu(net_device_ctx->rx_stats);
1201         free_netdev(netdev);
1202 }
1203
1204 static struct net_device *get_netvsc_bymac(const u8 *mac)
1205 {
1206         struct net_device *dev;
1207
1208         ASSERT_RTNL();
1209
1210         for_each_netdev(&init_net, dev) {
1211                 if (dev->netdev_ops != &device_ops)
1212                         continue;       /* not a netvsc device */
1213
1214                 if (ether_addr_equal(mac, dev->perm_addr))
1215                         return dev;
1216         }
1217
1218         return NULL;
1219 }
1220
1221 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1222 {
1223         struct net_device *dev;
1224
1225         ASSERT_RTNL();
1226
1227         for_each_netdev(&init_net, dev) {
1228                 struct net_device_context *net_device_ctx;
1229
1230                 if (dev->netdev_ops != &device_ops)
1231                         continue;       /* not a netvsc device */
1232
1233                 net_device_ctx = netdev_priv(dev);
1234                 if (net_device_ctx->nvdev == NULL)
1235                         continue;       /* device is removed */
1236
1237                 if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev)
1238                         return dev;     /* a match */
1239         }
1240
1241         return NULL;
1242 }
1243
1244 static int netvsc_register_vf(struct net_device *vf_netdev)
1245 {
1246         struct net_device *ndev;
1247         struct net_device_context *net_device_ctx;
1248         struct device *pdev = vf_netdev->dev.parent;
1249         struct netvsc_device *netvsc_dev;
1250
1251         if (vf_netdev->addr_len != ETH_ALEN)
1252                 return NOTIFY_DONE;
1253
1254         if (!pdev || !dev_is_pci(pdev) || dev_is_pf(pdev))
1255                 return NOTIFY_DONE;
1256
1257         /*
1258          * We will use the MAC address to locate the synthetic interface to
1259          * associate with the VF interface. If we don't find a matching
1260          * synthetic interface, move on.
1261          */
1262         ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1263         if (!ndev)
1264                 return NOTIFY_DONE;
1265
1266         net_device_ctx = netdev_priv(ndev);
1267         netvsc_dev = net_device_ctx->nvdev;
1268         if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1269                 return NOTIFY_DONE;
1270
1271         netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1272         /*
1273          * Take a reference on the module.
1274          */
1275         try_module_get(THIS_MODULE);
1276
1277         dev_hold(vf_netdev);
1278         rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1279         return NOTIFY_OK;
1280 }
1281
1282 static int netvsc_vf_up(struct net_device *vf_netdev)
1283 {
1284         struct net_device *ndev;
1285         struct netvsc_device *netvsc_dev;
1286         struct net_device_context *net_device_ctx;
1287
1288         ndev = get_netvsc_byref(vf_netdev);
1289         if (!ndev)
1290                 return NOTIFY_DONE;
1291
1292         net_device_ctx = netdev_priv(ndev);
1293         netvsc_dev = net_device_ctx->nvdev;
1294
1295         netdev_info(ndev, "VF up: %s\n", vf_netdev->name);
1296
1297         /*
1298          * Open the device before switching data path.
1299          */
1300         rndis_filter_open(netvsc_dev);
1301
1302         /*
1303          * notify the host to switch the data path.
1304          */
1305         netvsc_switch_datapath(ndev, true);
1306         netdev_info(ndev, "Data path switched to VF: %s\n", vf_netdev->name);
1307
1308         netif_carrier_off(ndev);
1309
1310         /* Now notify peers through VF device. */
1311         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, vf_netdev);
1312
1313         return NOTIFY_OK;
1314 }
1315
1316 static int netvsc_vf_down(struct net_device *vf_netdev)
1317 {
1318         struct net_device *ndev;
1319         struct netvsc_device *netvsc_dev;
1320         struct net_device_context *net_device_ctx;
1321
1322         ndev = get_netvsc_byref(vf_netdev);
1323         if (!ndev)
1324                 return NOTIFY_DONE;
1325
1326         net_device_ctx = netdev_priv(ndev);
1327         netvsc_dev = net_device_ctx->nvdev;
1328
1329         netdev_info(ndev, "VF down: %s\n", vf_netdev->name);
1330         netvsc_switch_datapath(ndev, false);
1331         netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
1332         rndis_filter_close(netvsc_dev);
1333         netif_carrier_on(ndev);
1334
1335         /* Now notify peers through netvsc device. */
1336         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, ndev);
1337
1338         return NOTIFY_OK;
1339 }
1340
1341 static int netvsc_unregister_vf(struct net_device *vf_netdev)
1342 {
1343         struct net_device *ndev;
1344         struct netvsc_device *netvsc_dev;
1345         struct net_device_context *net_device_ctx;
1346
1347         ndev = get_netvsc_byref(vf_netdev);
1348         if (!ndev)
1349                 return NOTIFY_DONE;
1350
1351         net_device_ctx = netdev_priv(ndev);
1352         netvsc_dev = net_device_ctx->nvdev;
1353
1354         netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
1355
1356         RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
1357         dev_put(vf_netdev);
1358         module_put(THIS_MODULE);
1359         return NOTIFY_OK;
1360 }
1361
1362 static int netvsc_probe(struct hv_device *dev,
1363                         const struct hv_vmbus_device_id *dev_id)
1364 {
1365         struct net_device *net = NULL;
1366         struct net_device_context *net_device_ctx;
1367         struct netvsc_device_info device_info;
1368         struct netvsc_device *nvdev;
1369         int ret;
1370
1371         net = alloc_etherdev_mq(sizeof(struct net_device_context),
1372                                 num_online_cpus());
1373         if (!net)
1374                 return -ENOMEM;
1375
1376         netif_carrier_off(net);
1377
1378         netvsc_init_settings(net);
1379
1380         net_device_ctx = netdev_priv(net);
1381         net_device_ctx->device_ctx = dev;
1382         net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1383         if (netif_msg_probe(net_device_ctx))
1384                 netdev_dbg(net, "netvsc msg_enable: %d\n",
1385                            net_device_ctx->msg_enable);
1386
1387         net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1388         if (!net_device_ctx->tx_stats) {
1389                 free_netdev(net);
1390                 return -ENOMEM;
1391         }
1392         net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1393         if (!net_device_ctx->rx_stats) {
1394                 free_percpu(net_device_ctx->tx_stats);
1395                 free_netdev(net);
1396                 return -ENOMEM;
1397         }
1398
1399         hv_set_drvdata(dev, net);
1400
1401         net_device_ctx->start_remove = false;
1402
1403         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1404         INIT_WORK(&net_device_ctx->work, do_set_multicast);
1405
1406         spin_lock_init(&net_device_ctx->lock);
1407         INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1408
1409         net->netdev_ops = &device_ops;
1410
1411         net->hw_features = NETVSC_HW_FEATURES;
1412         net->features = NETVSC_HW_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
1413
1414         net->ethtool_ops = &ethtool_ops;
1415         SET_NETDEV_DEV(net, &dev->device);
1416
1417         /* We always need headroom for rndis header */
1418         net->needed_headroom = RNDIS_AND_PPI_SIZE;
1419
1420         /* Notify the netvsc driver of the new device */
1421         memset(&device_info, 0, sizeof(device_info));
1422         device_info.ring_size = ring_size;
1423         device_info.max_num_vrss_chns = max_num_vrss_chns;
1424         ret = rndis_filter_device_add(dev, &device_info);
1425         if (ret != 0) {
1426                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1427                 netvsc_free_netdev(net);
1428                 hv_set_drvdata(dev, NULL);
1429                 return ret;
1430         }
1431         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1432
1433         nvdev = net_device_ctx->nvdev;
1434         netif_set_real_num_tx_queues(net, nvdev->num_chn);
1435         netif_set_real_num_rx_queues(net, nvdev->num_chn);
1436         netif_set_gso_max_size(net, NETVSC_GSO_MAX_SIZE);
1437
1438         ret = register_netdev(net);
1439         if (ret != 0) {
1440                 pr_err("Unable to register netdev.\n");
1441                 rndis_filter_device_remove(dev);
1442                 netvsc_free_netdev(net);
1443         }
1444
1445         return ret;
1446 }
1447
1448 static int netvsc_remove(struct hv_device *dev)
1449 {
1450         struct net_device *net;
1451         struct net_device_context *ndev_ctx;
1452         struct netvsc_device *net_device;
1453
1454         net = hv_get_drvdata(dev);
1455
1456         if (net == NULL) {
1457                 dev_err(&dev->device, "No net device to remove\n");
1458                 return 0;
1459         }
1460
1461         ndev_ctx = netdev_priv(net);
1462         net_device = ndev_ctx->nvdev;
1463
1464         /* Avoid racing with netvsc_change_mtu()/netvsc_set_channels()
1465          * removing the device.
1466          */
1467         rtnl_lock();
1468         ndev_ctx->start_remove = true;
1469         rtnl_unlock();
1470
1471         cancel_delayed_work_sync(&ndev_ctx->dwork);
1472         cancel_work_sync(&ndev_ctx->work);
1473
1474         /* Stop outbound asap */
1475         netif_tx_disable(net);
1476
1477         unregister_netdev(net);
1478
1479         /*
1480          * Call to the vsc driver to let it know that the device is being
1481          * removed
1482          */
1483         rndis_filter_device_remove(dev);
1484
1485         hv_set_drvdata(dev, NULL);
1486
1487         netvsc_free_netdev(net);
1488         return 0;
1489 }
1490
1491 static const struct hv_vmbus_device_id id_table[] = {
1492         /* Network guid */
1493         { HV_NIC_GUID, },
1494         { },
1495 };
1496
1497 MODULE_DEVICE_TABLE(vmbus, id_table);
1498
1499 /* The one and only one */
1500 static struct  hv_driver netvsc_drv = {
1501         .name = KBUILD_MODNAME,
1502         .id_table = id_table,
1503         .probe = netvsc_probe,
1504         .remove = netvsc_remove,
1505 };
1506
1507 /*
1508  * On Hyper-V, every VF interface is matched with a corresponding
1509  * synthetic interface. The synthetic interface is presented first
1510  * to the guest. When the corresponding VF instance is registered,
1511  * we will take care of switching the data path.
1512  */
1513 static int netvsc_netdev_event(struct notifier_block *this,
1514                                unsigned long event, void *ptr)
1515 {
1516         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
1517
1518         /* Skip our own events */
1519         if (event_dev->netdev_ops == &device_ops)
1520                 return NOTIFY_DONE;
1521
1522         /* Avoid non-Ethernet type devices */
1523         if (event_dev->type != ARPHRD_ETHER)
1524                 return NOTIFY_DONE;
1525
1526         /* Avoid Vlan dev with same MAC registering as VF */
1527         if (event_dev->priv_flags & IFF_802_1Q_VLAN)
1528                 return NOTIFY_DONE;
1529
1530         /* Avoid Bonding master dev with same MAC registering as VF */
1531         if ((event_dev->priv_flags & IFF_BONDING) &&
1532             (event_dev->flags & IFF_MASTER))
1533                 return NOTIFY_DONE;
1534
1535         switch (event) {
1536         case NETDEV_REGISTER:
1537                 return netvsc_register_vf(event_dev);
1538         case NETDEV_UNREGISTER:
1539                 return netvsc_unregister_vf(event_dev);
1540         case NETDEV_UP:
1541                 return netvsc_vf_up(event_dev);
1542         case NETDEV_DOWN:
1543                 return netvsc_vf_down(event_dev);
1544         default:
1545                 return NOTIFY_DONE;
1546         }
1547 }
1548
1549 static struct notifier_block netvsc_netdev_notifier = {
1550         .notifier_call = netvsc_netdev_event,
1551 };
1552
1553 static void __exit netvsc_drv_exit(void)
1554 {
1555         unregister_netdevice_notifier(&netvsc_netdev_notifier);
1556         vmbus_driver_unregister(&netvsc_drv);
1557 }
1558
1559 static int __init netvsc_drv_init(void)
1560 {
1561         int ret;
1562
1563         if (ring_size < RING_SIZE_MIN) {
1564                 ring_size = RING_SIZE_MIN;
1565                 pr_info("Increased ring_size to %d (min allowed)\n",
1566                         ring_size);
1567         }
1568         ret = vmbus_driver_register(&netvsc_drv);
1569
1570         if (ret)
1571                 return ret;
1572
1573         register_netdevice_notifier(&netvsc_netdev_notifier);
1574         return 0;
1575 }
1576
1577 MODULE_LICENSE("GPL");
1578 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1579
1580 module_init(netvsc_drv_init);
1581 module_exit(netvsc_drv_exit);