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 #define RING_SIZE_MIN 64
  44 #define LINKCHANGE_INT (2 * HZ)
  45
  46 static int ring_size = 128;
  47 module_param(ring_size, int, S_IRUGO);
  48 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
  49
  50 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
  51                                 NETIF_MSG_LINK | NETIF_MSG_IFUP |
  52                                 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
  53                                 NETIF_MSG_TX_ERR;
  54
  55 static int debug = -1;
  56 module_param(debug, int, S_IRUGO);
  57 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  58
  59 static void do_set_multicast(struct work_struct *w)
  60 {
  61         struct net_device_context *ndevctx =
  62                 container_of(w, struct net_device_context, work);
  63         struct hv_device *device_obj = ndevctx->device_ctx;
  64         struct net_device *ndev = hv_get_drvdata(device_obj);
  65         struct netvsc_device *nvdev = ndevctx->nvdev;
  66         struct rndis_device *rdev;
  67
  68         if (!nvdev)
  69                 return;
  70
  71         rdev = nvdev->extension;
  72         if (rdev == NULL)
  73                 return;
  74
  75         if (ndev->flags & IFF_PROMISC)
  76                 rndis_filter_set_packet_filter(rdev,
  77                         NDIS_PACKET_TYPE_PROMISCUOUS);
  78         else
  79                 rndis_filter_set_packet_filter(rdev,
  80                         NDIS_PACKET_TYPE_BROADCAST |
  81                         NDIS_PACKET_TYPE_ALL_MULTICAST |
  82                         NDIS_PACKET_TYPE_DIRECTED);
  83 }
  84
  85 static void netvsc_set_multicast_list(struct net_device *net)
  86 {
  87         struct net_device_context *net_device_ctx = netdev_priv(net);
  88
  89         schedule_work(&net_device_ctx->work);
  90 }
  91
  92 static int netvsc_open(struct net_device *net)
  93 {
  94         struct netvsc_device *nvdev = net_device_to_netvsc_device(net);
  95         struct rndis_device *rdev;
  96         int ret = 0;
  97
  98         netif_carrier_off(net);
  99
 100         /* Open up the device */
 101         ret = rndis_filter_open(nvdev);
 102         if (ret != 0) {
 103                 netdev_err(net, "unable to open device (ret %d).\n", ret);
 104                 return ret;
 105         }
 106
 107         netif_tx_wake_all_queues(net);
 108
 109         rdev = nvdev->extension;
 110         if (!rdev->link_state)
 111                 netif_carrier_on(net);
 112
 113         return ret;
 114 }
 115
 116 static int netvsc_close(struct net_device *net)
 117 {
 118         struct net_device_context *net_device_ctx = netdev_priv(net);
 119         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 120         int ret;
 121         u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
 122         struct vmbus_channel *chn;
 123
 124         netif_tx_disable(net);
 125
 126         /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
 127         cancel_work_sync(&net_device_ctx->work);
 128         ret = rndis_filter_close(nvdev);
 129         if (ret != 0) {
 130                 netdev_err(net, "unable to close device (ret %d).\n", ret);
 131                 return ret;
 132         }
 133
 134         /* Ensure pending bytes in ring are read */
 135         while (true) {
 136                 aread = 0;
 137                 for (i = 0; i < nvdev->num_chn; i++) {
 138                         chn = nvdev->chn_table[i];
 139                         if (!chn)
 140                                 continue;
 141
 142                         hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
 143                                                      &awrite);
 144
 145                         if (aread)
 146                                 break;
 147
 148                         hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
 149                                                      &awrite);
 150
 151                         if (aread)
 152                                 break;
 153                 }
 154
 155                 retry++;
 156                 if (retry > retry_max || aread == 0)
 157                         break;
 158
 159                 msleep(msec);
 160
 161                 if (msec < 1000)
 162                         msec *= 2;
 163         }
 164
 165         if (aread) {
 166                 netdev_err(net, "Ring buffer not empty after closing rndis\n");
 167                 ret = -ETIMEDOUT;
 168         }
 169
 170         return ret;
 171 }
 172
 173 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
 174                                 int pkt_type)
 175 {
 176         struct rndis_packet *rndis_pkt;
 177         struct rndis_per_packet_info *ppi;
 178
 179         rndis_pkt = &msg->msg.pkt;
 180         rndis_pkt->data_offset += ppi_size;
 181
 182         ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
 183                 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
 184
 185         ppi->size = ppi_size;
 186         ppi->type = pkt_type;
 187         ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 188
 189         rndis_pkt->per_pkt_info_len += ppi_size;
 190
 191         return ppi;
 192 }
 193
 194 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
 195                         void *accel_priv, select_queue_fallback_t fallback)
 196 {
 197         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 198         struct netvsc_device *nvsc_dev = net_device_ctx->nvdev;
 199         u32 hash;
 200         u16 q_idx = 0;
 201
 202         if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
 203                 return 0;
 204
 205         hash = skb_get_hash(skb);
 206         q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
 207                 ndev->real_num_tx_queues;
 208
 209         if (!nvsc_dev->chn_table[q_idx])
 210                 q_idx = 0;
 211
 212         return q_idx;
 213 }
 214
 215 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
 216                         struct hv_page_buffer *pb)
 217 {
 218         int j = 0;
 219
 220         /* Deal with compund pages by ignoring unused part
 221          * of the page.
 222          */
 223         page += (offset >> PAGE_SHIFT);
 224         offset &= ~PAGE_MASK;
 225
 226         while (len > 0) {
 227                 unsigned long bytes;
 228
 229                 bytes = PAGE_SIZE - offset;
 230                 if (bytes > len)
 231                         bytes = len;
 232                 pb[j].pfn = page_to_pfn(page);
 233                 pb[j].offset = offset;
 234                 pb[j].len = bytes;
 235
 236                 offset += bytes;
 237                 len -= bytes;
 238
 239                 if (offset == PAGE_SIZE && len) {
 240                         page++;
 241                         offset = 0;
 242                         j++;
 243                 }
 244         }
 245
 246         return j + 1;
 247 }
 248
 249 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
 250                            struct hv_netvsc_packet *packet,
 251                            struct hv_page_buffer **page_buf)
 252 {
 253         struct hv_page_buffer *pb = *page_buf;
 254         u32 slots_used = 0;
 255         char *data = skb->data;
 256         int frags = skb_shinfo(skb)->nr_frags;
 257         int i;
 258
 259         /* The packet is laid out thus:
 260          * 1. hdr: RNDIS header and PPI
 261          * 2. skb linear data
 262          * 3. skb fragment data
 263          */
 264         if (hdr != NULL)
 265                 slots_used += fill_pg_buf(virt_to_page(hdr),
 266                                         offset_in_page(hdr),
 267                                         len, &pb[slots_used]);
 268
 269         packet->rmsg_size = len;
 270         packet->rmsg_pgcnt = slots_used;
 271
 272         slots_used += fill_pg_buf(virt_to_page(data),
 273                                 offset_in_page(data),
 274                                 skb_headlen(skb), &pb[slots_used]);
 275
 276         for (i = 0; i < frags; i++) {
 277                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 278
 279                 slots_used += fill_pg_buf(skb_frag_page(frag),
 280                                         frag->page_offset,
 281                                         skb_frag_size(frag), &pb[slots_used]);
 282         }
 283         return slots_used;
 284 }
 285
 286 static int count_skb_frag_slots(struct sk_buff *skb)
 287 {
 288         int i, frags = skb_shinfo(skb)->nr_frags;
 289         int pages = 0;
 290
 291         for (i = 0; i < frags; i++) {
 292                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 293                 unsigned long size = skb_frag_size(frag);
 294                 unsigned long offset = frag->page_offset;
 295
 296                 /* Skip unused frames from start of page */
 297                 offset &= ~PAGE_MASK;
 298                 pages += PFN_UP(offset + size);
 299         }
 300         return pages;
 301 }
 302
 303 static int netvsc_get_slots(struct sk_buff *skb)
 304 {
 305         char *data = skb->data;
 306         unsigned int offset = offset_in_page(data);
 307         unsigned int len = skb_headlen(skb);
 308         int slots;
 309         int frag_slots;
 310
 311         slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
 312         frag_slots = count_skb_frag_slots(skb);
 313         return slots + frag_slots;
 314 }
 315
 316 static u32 net_checksum_info(struct sk_buff *skb)
 317 {
 318         if (skb->protocol == htons(ETH_P_IP)) {
 319                 struct iphdr *ip = ip_hdr(skb);
 320
 321                 if (ip->protocol == IPPROTO_TCP)
 322                         return TRANSPORT_INFO_IPV4_TCP;
 323                 else if (ip->protocol == IPPROTO_UDP)
 324                         return TRANSPORT_INFO_IPV4_UDP;
 325         } else {
 326                 struct ipv6hdr *ip6 = ipv6_hdr(skb);
 327
 328                 if (ip6->nexthdr == IPPROTO_TCP)
 329                         return TRANSPORT_INFO_IPV6_TCP;
 330                 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
 331                         return TRANSPORT_INFO_IPV6_UDP;
 332         }
 333
 334         return TRANSPORT_INFO_NOT_IP;
 335 }
 336
 337 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 338 {
 339         struct net_device_context *net_device_ctx = netdev_priv(net);
 340         struct hv_netvsc_packet *packet = NULL;
 341         int ret;
 342         unsigned int num_data_pgs;
 343         struct rndis_message *rndis_msg;
 344         struct rndis_packet *rndis_pkt;
 345         u32 rndis_msg_size;
 346         struct rndis_per_packet_info *ppi;
 347         u32 hash;
 348         u32 skb_length;
 349         struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
 350         struct hv_page_buffer *pb = page_buf;
 351
 352         /* We will atmost need two pages to describe the rndis
 353          * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
 354          * of pages in a single packet. If skb is scattered around
 355          * more pages we try linearizing it.
 356          */
 357
 358         skb_length = skb->len;
 359         num_data_pgs = netvsc_get_slots(skb) + 2;
 360
 361         if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
 362                 ++net_device_ctx->eth_stats.tx_scattered;
 363
 364                 if (skb_linearize(skb))
 365                         goto no_memory;
 366
 367                 num_data_pgs = netvsc_get_slots(skb) + 2;
 368                 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
 369                         ++net_device_ctx->eth_stats.tx_too_big;
 370                         goto drop;
 371                 }
 372         }
 373
 374         /*
 375          * Place the rndis header in the skb head room and
 376          * the skb->cb will be used for hv_netvsc_packet
 377          * structure.
 378          */
 379         ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
 380         if (ret)
 381                 goto no_memory;
 382
 383         /* Use the skb control buffer for building up the packet */
 384         BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
 385                         FIELD_SIZEOF(struct sk_buff, cb));
 386         packet = (struct hv_netvsc_packet *)skb->cb;
 387
 388         packet->q_idx = skb_get_queue_mapping(skb);
 389
 390         packet->total_data_buflen = skb->len;
 391
 392         rndis_msg = (struct rndis_message *)skb->head;
 393
 394         memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
 395
 396         /* Add the rndis header */
 397         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 398         rndis_msg->msg_len = packet->total_data_buflen;
 399         rndis_pkt = &rndis_msg->msg.pkt;
 400         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 401         rndis_pkt->data_len = packet->total_data_buflen;
 402         rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 403
 404         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 405
 406         hash = skb_get_hash_raw(skb);
 407         if (hash != 0 && net->real_num_tx_queues > 1) {
 408                 rndis_msg_size += NDIS_HASH_PPI_SIZE;
 409                 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
 410                                     NBL_HASH_VALUE);
 411                 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
 412         }
 413
 414         if (skb_vlan_tag_present(skb)) {
 415                 struct ndis_pkt_8021q_info *vlan;
 416
 417                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 418                 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
 419                                         IEEE_8021Q_INFO);
 420                 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
 421                                                 ppi->ppi_offset);
 422                 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
 423                 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
 424                                 VLAN_PRIO_SHIFT;
 425         }
 426
 427         if (skb_is_gso(skb)) {
 428                 struct ndis_tcp_lso_info *lso_info;
 429
 430                 rndis_msg_size += NDIS_LSO_PPI_SIZE;
 431                 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
 432                                     TCP_LARGESEND_PKTINFO);
 433
 434                 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
 435                                                         ppi->ppi_offset);
 436
 437                 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
 438                 if (skb->protocol == htons(ETH_P_IP)) {
 439                         lso_info->lso_v2_transmit.ip_version =
 440                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
 441                         ip_hdr(skb)->tot_len = 0;
 442                         ip_hdr(skb)->check = 0;
 443                         tcp_hdr(skb)->check =
 444                                 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 445                                                    ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 446                 } else {
 447                         lso_info->lso_v2_transmit.ip_version =
 448                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
 449                         ipv6_hdr(skb)->payload_len = 0;
 450                         tcp_hdr(skb)->check =
 451                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 452                                                  &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 453                 }
 454                 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
 455                 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 456         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 457                 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
 458                         struct ndis_tcp_ip_checksum_info *csum_info;
 459
 460                         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 461                         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 462                                             TCPIP_CHKSUM_PKTINFO);
 463
 464                         csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 465                                                                          ppi->ppi_offset);
 466
 467                         csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
 468
 469                         if (skb->protocol == htons(ETH_P_IP)) {
 470                                 csum_info->transmit.is_ipv4 = 1;
 471
 472                                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 473                                         csum_info->transmit.tcp_checksum = 1;
 474                                 else
 475                                         csum_info->transmit.udp_checksum = 1;
 476                         } else {
 477                                 csum_info->transmit.is_ipv6 = 1;
 478
 479                                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
 480                                         csum_info->transmit.tcp_checksum = 1;
 481                                 else
 482                                         csum_info->transmit.udp_checksum = 1;
 483                         }
 484                 } else {
 485                         /* Can't do offload of this type of checksum */
 486                         if (skb_checksum_help(skb))
 487                                 goto drop;
 488                 }
 489         }
 490
 491         /* Start filling in the page buffers with the rndis hdr */
 492         rndis_msg->msg_len += rndis_msg_size;
 493         packet->total_data_buflen = rndis_msg->msg_len;
 494         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 495                                                skb, packet, &pb);
 496
 497         /* timestamp packet in software */
 498         skb_tx_timestamp(skb);
 499         ret = netvsc_send(net_device_ctx->device_ctx, packet,
 500                           rndis_msg, &pb, skb);
 501         if (likely(ret == 0)) {
 502                 struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats);
 503
 504                 u64_stats_update_begin(&tx_stats->syncp);
 505                 tx_stats->packets++;
 506                 tx_stats->bytes += skb_length;
 507                 u64_stats_update_end(&tx_stats->syncp);
 508                 return NETDEV_TX_OK;
 509         }
 510
 511         if (ret == -EAGAIN) {
 512                 ++net_device_ctx->eth_stats.tx_busy;
 513                 return NETDEV_TX_BUSY;
 514         }
 515
 516         if (ret == -ENOSPC)
 517                 ++net_device_ctx->eth_stats.tx_no_space;
 518
 519 drop:
 520         dev_kfree_skb_any(skb);
 521         net->stats.tx_dropped++;
 522
 523         return NETDEV_TX_OK;
 524
 525 no_memory:
 526         ++net_device_ctx->eth_stats.tx_no_memory;
 527         goto drop;
 528 }
 529
 530 /*
 531  * netvsc_linkstatus_callback - Link up/down notification
 532  */
 533 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 534                                 struct rndis_message *resp)
 535 {
 536         struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
 537         struct net_device *net;
 538         struct net_device_context *ndev_ctx;
 539         struct netvsc_reconfig *event;
 540         unsigned long flags;
 541
 542         net = hv_get_drvdata(device_obj);
 543
 544         if (!net)
 545                 return;
 546
 547         ndev_ctx = netdev_priv(net);
 548
 549         /* Update the physical link speed when changing to another vSwitch */
 550         if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
 551                 u32 speed;
 552
 553                 speed = *(u32 *)((void *)indicate + indicate->
 554                                  status_buf_offset) / 10000;
 555                 ndev_ctx->speed = speed;
 556                 return;
 557         }
 558
 559         /* Handle these link change statuses below */
 560         if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
 561             indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
 562             indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
 563                 return;
 564
 565         if (net->reg_state != NETREG_REGISTERED)
 566                 return;
 567
 568         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 569         if (!event)
 570                 return;
 571         event->event = indicate->status;
 572
 573         spin_lock_irqsave(&ndev_ctx->lock, flags);
 574         list_add_tail(&event->list, &ndev_ctx->reconfig_events);
 575         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
 576
 577         schedule_delayed_work(&ndev_ctx->dwork, 0);
 578 }
 579
 580 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 581                                 struct hv_netvsc_packet *packet,
 582                                 struct ndis_tcp_ip_checksum_info *csum_info,
 583                                 void *data, u16 vlan_tci)
 584 {
 585         struct sk_buff *skb;
 586
 587         skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
 588         if (!skb)
 589                 return skb;
 590
 591         /*
 592          * Copy to skb. This copy is needed here since the memory pointed by
 593          * hv_netvsc_packet cannot be deallocated
 594          */
 595         memcpy(skb_put(skb, packet->total_data_buflen), data,
 596                packet->total_data_buflen);
 597
 598         skb->protocol = eth_type_trans(skb, net);
 599
 600         /* skb is already created with CHECKSUM_NONE */
 601         skb_checksum_none_assert(skb);
 602
 603         /*
 604          * In Linux, the IP checksum is always checked.
 605          * Do L4 checksum offload if enabled and present.
 606          */
 607         if (csum_info && (net->features & NETIF_F_RXCSUM)) {
 608                 if (csum_info->receive.tcp_checksum_succeeded ||
 609                     csum_info->receive.udp_checksum_succeeded)
 610                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 611         }
 612
 613         if (vlan_tci & VLAN_TAG_PRESENT)
 614                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 615                                        vlan_tci);
 616
 617         return skb;
 618 }
 619
 620 /*
 621  * netvsc_recv_callback -  Callback when we receive a packet from the
 622  * "wire" on the specified device.
 623  */
 624 int netvsc_recv_callback(struct hv_device *device_obj,
 625                                 struct hv_netvsc_packet *packet,
 626                                 void **data,
 627                                 struct ndis_tcp_ip_checksum_info *csum_info,
 628                                 struct vmbus_channel *channel,
 629                                 u16 vlan_tci)
 630 {
 631         struct net_device *net = hv_get_drvdata(device_obj);
 632         struct net_device_context *net_device_ctx = netdev_priv(net);
 633         struct net_device *vf_netdev;
 634         struct sk_buff *skb;
 635         struct netvsc_stats *rx_stats;
 636
 637         if (net->reg_state != NETREG_REGISTERED)
 638                 return NVSP_STAT_FAIL;
 639
 640         /*
 641          * If necessary, inject this packet into the VF interface.
 642          * On Hyper-V, multicast and brodcast packets are only delivered
 643          * to the synthetic interface (after subjecting these to
 644          * policy filters on the host). Deliver these via the VF
 645          * interface in the guest.
 646          */
 647         rcu_read_lock();
 648         vf_netdev = rcu_dereference(net_device_ctx->vf_netdev);
 649         if (vf_netdev && (vf_netdev->flags & IFF_UP))
 650                 net = vf_netdev;
 651
 652         /* Allocate a skb - TODO direct I/O to pages? */
 653         skb = netvsc_alloc_recv_skb(net, packet, csum_info, *data, vlan_tci);
 654         if (unlikely(!skb)) {
 655                 ++net->stats.rx_dropped;
 656                 rcu_read_unlock();
 657                 return NVSP_STAT_FAIL;
 658         }
 659
 660         if (net != vf_netdev)
 661                 skb_record_rx_queue(skb,
 662                                     channel->offermsg.offer.sub_channel_index);
 663
 664         /*
 665          * Even if injecting the packet, record the statistics
 666          * on the synthetic device because modifying the VF device
 667          * statistics will not work correctly.
 668          */
 669         rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
 670         u64_stats_update_begin(&rx_stats->syncp);
 671         rx_stats->packets++;
 672         rx_stats->bytes += packet->total_data_buflen;
 673
 674         if (skb->pkt_type == PACKET_BROADCAST)
 675                 ++rx_stats->broadcast;
 676         else if (skb->pkt_type == PACKET_MULTICAST)
 677                 ++rx_stats->multicast;
 678         u64_stats_update_end(&rx_stats->syncp);
 679
 680         /*
 681          * Pass the skb back up. Network stack will deallocate the skb when it
 682          * is done.
 683          * TODO - use NAPI?
 684          */
 685         netif_rx(skb);
 686         rcu_read_unlock();
 687
 688         return 0;
 689 }
 690
 691 static void netvsc_get_drvinfo(struct net_device *net,
 692                                struct ethtool_drvinfo *info)
 693 {
 694         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 695         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 696 }
 697
 698 static void netvsc_get_channels(struct net_device *net,
 699                                 struct ethtool_channels *channel)
 700 {
 701         struct net_device_context *net_device_ctx = netdev_priv(net);
 702         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 703
 704         if (nvdev) {
 705                 channel->max_combined   = nvdev->max_chn;
 706                 channel->combined_count = nvdev->num_chn;
 707         }
 708 }
 709
 710 static int netvsc_set_queues(struct net_device *net, struct hv_device *dev,
 711                              u32 num_chn)
 712 {
 713         struct netvsc_device_info device_info;
 714         int ret;
 715
 716         memset(&device_info, 0, sizeof(device_info));
 717         device_info.num_chn = num_chn;
 718         device_info.ring_size = ring_size;
 719         device_info.max_num_vrss_chns = num_chn;
 720
 721         ret = rndis_filter_device_add(dev, &device_info);
 722         if (ret)
 723                 return ret;
 724
 725         ret = netif_set_real_num_tx_queues(net, num_chn);
 726         if (ret)
 727                 return ret;
 728
 729         ret = netif_set_real_num_rx_queues(net, num_chn);
 730
 731         return ret;
 732 }
 733
 734 static int netvsc_set_channels(struct net_device *net,
 735                                struct ethtool_channels *channels)
 736 {
 737         struct net_device_context *net_device_ctx = netdev_priv(net);
 738         struct hv_device *dev = net_device_ctx->device_ctx;
 739         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 740         unsigned int count = channels->combined_count;
 741         int ret;
 742
 743         /* We do not support separate count for rx, tx, or other */
 744         if (count == 0 ||
 745             channels->rx_count || channels->tx_count || channels->other_count)
 746                 return -EINVAL;
 747
 748         if (count > net->num_tx_queues || count > net->num_rx_queues)
 749                 return -EINVAL;
 750
 751         if (net_device_ctx->start_remove || !nvdev || nvdev->destroy)
 752                 return -ENODEV;
 753
 754         if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
 755                 return -EINVAL;
 756
 757         if (count > nvdev->max_chn)
 758                 return -EINVAL;
 759
 760         ret = netvsc_close(net);
 761         if (ret)
 762                 return ret;
 763
 764         net_device_ctx->start_remove = true;
 765         rndis_filter_device_remove(dev);
 766
 767         ret = netvsc_set_queues(net, dev, count);
 768         if (ret == 0)
 769                 nvdev->num_chn = count;
 770         else
 771                 netvsc_set_queues(net, dev, nvdev->num_chn);
 772
 773         netvsc_open(net);
 774         net_device_ctx->start_remove = false;
 775
 776         /* We may have missed link change notifications */
 777         schedule_delayed_work(&net_device_ctx->dwork, 0);
 778
 779         return ret;
 780 }
 781
 782 static bool netvsc_validate_ethtool_ss_cmd(const struct ethtool_cmd *cmd)
 783 {
 784         struct ethtool_cmd diff1 = *cmd;
 785         struct ethtool_cmd diff2 = {};
 786
 787         ethtool_cmd_speed_set(&diff1, 0);
 788         diff1.duplex = 0;
 789         /* advertising and cmd are usually set */
 790         diff1.advertising = 0;
 791         diff1.cmd = 0;
 792         /* We set port to PORT_OTHER */
 793         diff2.port = PORT_OTHER;
 794
 795         return !memcmp(&diff1, &diff2, sizeof(diff1));
 796 }
 797
 798 static void netvsc_init_settings(struct net_device *dev)
 799 {
 800         struct net_device_context *ndc = netdev_priv(dev);
 801
 802         ndc->speed = SPEED_UNKNOWN;
 803         ndc->duplex = DUPLEX_UNKNOWN;
 804 }
 805
 806 static int netvsc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 807 {
 808         struct net_device_context *ndc = netdev_priv(dev);
 809
 810         ethtool_cmd_speed_set(cmd, ndc->speed);
 811         cmd->duplex = ndc->duplex;
 812         cmd->port = PORT_OTHER;
 813
 814         return 0;
 815 }
 816
 817 static int netvsc_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 818 {
 819         struct net_device_context *ndc = netdev_priv(dev);
 820         u32 speed;
 821
 822         speed = ethtool_cmd_speed(cmd);
 823         if (!ethtool_validate_speed(speed) ||
 824             !ethtool_validate_duplex(cmd->duplex) ||
 825             !netvsc_validate_ethtool_ss_cmd(cmd))
 826                 return -EINVAL;
 827
 828         ndc->speed = speed;
 829         ndc->duplex = cmd->duplex;
 830
 831         return 0;
 832 }
 833
 834 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 835 {
 836         struct net_device_context *ndevctx = netdev_priv(ndev);
 837         struct netvsc_device *nvdev = ndevctx->nvdev;
 838         struct hv_device *hdev = ndevctx->device_ctx;
 839         struct netvsc_device_info device_info;
 840         int ret;
 841
 842         if (ndevctx->start_remove || !nvdev || nvdev->destroy)
 843                 return -ENODEV;
 844
 845         ret = netvsc_close(ndev);
 846         if (ret)
 847                 goto out;
 848
 849         ndevctx->start_remove = true;
 850         rndis_filter_device_remove(hdev);
 851
 852         ndev->mtu = mtu;
 853
 854         memset(&device_info, 0, sizeof(device_info));
 855         device_info.ring_size = ring_size;
 856         device_info.num_chn = nvdev->num_chn;
 857         device_info.max_num_vrss_chns = nvdev->num_chn;
 858         rndis_filter_device_add(hdev, &device_info);
 859
 860 out:
 861         netvsc_open(ndev);
 862         ndevctx->start_remove = false;
 863
 864         /* We may have missed link change notifications */
 865         schedule_delayed_work(&ndevctx->dwork, 0);
 866
 867         return ret;
 868 }
 869
 870 static void netvsc_get_stats64(struct net_device *net,
 871                                struct rtnl_link_stats64 *t)
 872 {
 873         struct net_device_context *ndev_ctx = netdev_priv(net);
 874         int cpu;
 875
 876         for_each_possible_cpu(cpu) {
 877                 struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats,
 878                                                             cpu);
 879                 struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats,
 880                                                             cpu);
 881                 u64 tx_packets, tx_bytes, rx_packets, rx_bytes, rx_multicast;
 882                 unsigned int start;
 883
 884                 do {
 885                         start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
 886                         tx_packets = tx_stats->packets;
 887                         tx_bytes = tx_stats->bytes;
 888                 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
 889
 890                 do {
 891                         start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
 892                         rx_packets = rx_stats->packets;
 893                         rx_bytes = rx_stats->bytes;
 894                         rx_multicast = rx_stats->multicast + rx_stats->broadcast;
 895                 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
 896
 897                 t->tx_bytes     += tx_bytes;
 898                 t->tx_packets   += tx_packets;
 899                 t->rx_bytes     += rx_bytes;
 900                 t->rx_packets   += rx_packets;
 901                 t->multicast    += rx_multicast;
 902         }
 903
 904         t->tx_dropped   = net->stats.tx_dropped;
 905         t->tx_errors    = net->stats.tx_dropped;
 906
 907         t->rx_dropped   = net->stats.rx_dropped;
 908         t->rx_errors    = net->stats.rx_errors;
 909 }
 910
 911 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
 912 {
 913         struct sockaddr *addr = p;
 914         char save_adr[ETH_ALEN];
 915         unsigned char save_aatype;
 916         int err;
 917
 918         memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
 919         save_aatype = ndev->addr_assign_type;
 920
 921         err = eth_mac_addr(ndev, p);
 922         if (err != 0)
 923                 return err;
 924
 925         err = rndis_filter_set_device_mac(ndev, addr->sa_data);
 926         if (err != 0) {
 927                 /* roll back to saved MAC */
 928                 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
 929                 ndev->addr_assign_type = save_aatype;
 930         }
 931
 932         return err;
 933 }
 934
 935 static const struct {
 936         char name[ETH_GSTRING_LEN];
 937         u16 offset;
 938 } netvsc_stats[] = {
 939         { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
 940         { "tx_no_memory",  offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
 941         { "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },
 942         { "tx_too_big",   offsetof(struct netvsc_ethtool_stats, tx_too_big) },
 943         { "tx_busy",      offsetof(struct netvsc_ethtool_stats, tx_busy) },
 944 };
 945
 946 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
 947 {
 948         switch (string_set) {
 949         case ETH_SS_STATS:
 950                 return ARRAY_SIZE(netvsc_stats);
 951         default:
 952                 return -EINVAL;
 953         }
 954 }
 955
 956 static void netvsc_get_ethtool_stats(struct net_device *dev,
 957                                      struct ethtool_stats *stats, u64 *data)
 958 {
 959         struct net_device_context *ndc = netdev_priv(dev);
 960         const void *nds = &ndc->eth_stats;
 961         int i;
 962
 963         for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)
 964                 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
 965 }
 966
 967 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 968 {
 969         int i;
 970
 971         switch (stringset) {
 972         case ETH_SS_STATS:
 973                 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)
 974                         memcpy(data + i * ETH_GSTRING_LEN,
 975                                netvsc_stats[i].name, ETH_GSTRING_LEN);
 976                 break;
 977         }
 978 }
 979
 980 static int
 981 netvsc_get_rss_hash_opts(struct netvsc_device *nvdev,
 982                          struct ethtool_rxnfc *info)
 983 {
 984         info->data = RXH_IP_SRC | RXH_IP_DST;
 985
 986         switch (info->flow_type) {
 987         case TCP_V4_FLOW:
 988         case TCP_V6_FLOW:
 989                 info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
 990                 /* fallthrough */
 991         case UDP_V4_FLOW:
 992         case UDP_V6_FLOW:
 993         case IPV4_FLOW:
 994         case IPV6_FLOW:
 995                 break;
 996         default:
 997                 info->data = 0;
 998                 break;
 999         }
1000
1001         return 0;
1002 }
1003
1004 static int
1005 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1006                  u32 *rules)
1007 {
1008         struct net_device_context *ndc = netdev_priv(dev);
1009         struct netvsc_device *nvdev = ndc->nvdev;
1010
1011         switch (info->cmd) {
1012         case ETHTOOL_GRXRINGS:
1013                 info->data = nvdev->num_chn;
1014                 return 0;
1015
1016         case ETHTOOL_GRXFH:
1017                 return netvsc_get_rss_hash_opts(nvdev, info);
1018         }
1019         return -EOPNOTSUPP;
1020 }
1021
1022 #ifdef CONFIG_NET_POLL_CONTROLLER
1023 static void netvsc_poll_controller(struct net_device *net)
1024 {
1025         /* As netvsc_start_xmit() works synchronous we don't have to
1026          * trigger anything here.
1027          */
1028 }
1029 #endif
1030
1031 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1032 {
1033         return NETVSC_HASH_KEYLEN;
1034 }
1035
1036 static u32 netvsc_rss_indir_size(struct net_device *dev)
1037 {
1038         return ITAB_NUM;
1039 }
1040
1041 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1042                            u8 *hfunc)
1043 {
1044         struct net_device_context *ndc = netdev_priv(dev);
1045         struct netvsc_device *ndev = ndc->nvdev;
1046         struct rndis_device *rndis_dev = ndev->extension;
1047         int i;
1048
1049         if (hfunc)
1050                 *hfunc = ETH_RSS_HASH_TOP;      /* Toeplitz */
1051
1052         if (indir) {
1053                 for (i = 0; i < ITAB_NUM; i++)
1054                         indir[i] = rndis_dev->ind_table[i];
1055         }
1056
1057         if (key)
1058                 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1059
1060         return 0;
1061 }
1062
1063 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1064                            const u8 *key, const u8 hfunc)
1065 {
1066         struct net_device_context *ndc = netdev_priv(dev);
1067         struct netvsc_device *ndev = ndc->nvdev;
1068         struct rndis_device *rndis_dev = ndev->extension;
1069         int i;
1070
1071         if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1072                 return -EOPNOTSUPP;
1073
1074         if (indir) {
1075                 for (i = 0; i < ITAB_NUM; i++)
1076                         if (indir[i] >= dev->num_rx_queues)
1077                                 return -EINVAL;
1078
1079                 for (i = 0; i < ITAB_NUM; i++)
1080                         rndis_dev->ind_table[i] = indir[i];
1081         }
1082
1083         if (!key) {
1084                 if (!indir)
1085                         return 0;
1086
1087                 key = rndis_dev->rss_key;
1088         }
1089
1090         return rndis_filter_set_rss_param(rndis_dev, key, ndev->num_chn);
1091 }
1092
1093 static const struct ethtool_ops ethtool_ops = {
1094         .get_drvinfo    = netvsc_get_drvinfo,
1095         .get_link       = ethtool_op_get_link,
1096         .get_ethtool_stats = netvsc_get_ethtool_stats,
1097         .get_sset_count = netvsc_get_sset_count,
1098         .get_strings    = netvsc_get_strings,
1099         .get_channels   = netvsc_get_channels,
1100         .set_channels   = netvsc_set_channels,
1101         .get_ts_info    = ethtool_op_get_ts_info,
1102         .get_settings   = netvsc_get_settings,
1103         .set_settings   = netvsc_set_settings,
1104         .get_rxnfc      = netvsc_get_rxnfc,
1105         .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1106         .get_rxfh_indir_size = netvsc_rss_indir_size,
1107         .get_rxfh       = netvsc_get_rxfh,
1108         .set_rxfh       = netvsc_set_rxfh,
1109 };
1110
1111 static const struct net_device_ops device_ops = {
1112         .ndo_open =                     netvsc_open,
1113         .ndo_stop =                     netvsc_close,
1114         .ndo_start_xmit =               netvsc_start_xmit,
1115         .ndo_set_rx_mode =              netvsc_set_multicast_list,
1116         .ndo_change_mtu =               netvsc_change_mtu,
1117         .ndo_validate_addr =            eth_validate_addr,
1118         .ndo_set_mac_address =          netvsc_set_mac_addr,
1119         .ndo_select_queue =             netvsc_select_queue,
1120         .ndo_get_stats64 =              netvsc_get_stats64,
1121 #ifdef CONFIG_NET_POLL_CONTROLLER
1122         .ndo_poll_controller =          netvsc_poll_controller,
1123 #endif
1124 };
1125
1126 /*
1127  * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1128  * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1129  * present send GARP packet to network peers with netif_notify_peers().
1130  */
1131 static void netvsc_link_change(struct work_struct *w)
1132 {
1133         struct net_device_context *ndev_ctx =
1134                 container_of(w, struct net_device_context, dwork.work);
1135         struct hv_device *device_obj = ndev_ctx->device_ctx;
1136         struct net_device *net = hv_get_drvdata(device_obj);
1137         struct netvsc_device *net_device;
1138         struct rndis_device *rdev;
1139         struct netvsc_reconfig *event = NULL;
1140         bool notify = false, reschedule = false;
1141         unsigned long flags, next_reconfig, delay;
1142
1143         rtnl_lock();
1144         if (ndev_ctx->start_remove)
1145                 goto out_unlock;
1146
1147         net_device = ndev_ctx->nvdev;
1148         rdev = net_device->extension;
1149
1150         next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1151         if (time_is_after_jiffies(next_reconfig)) {
1152                 /* link_watch only sends one notification with current state
1153                  * per second, avoid doing reconfig more frequently. Handle
1154                  * wrap around.
1155                  */
1156                 delay = next_reconfig - jiffies;
1157                 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1158                 schedule_delayed_work(&ndev_ctx->dwork, delay);
1159                 goto out_unlock;
1160         }
1161         ndev_ctx->last_reconfig = jiffies;
1162
1163         spin_lock_irqsave(&ndev_ctx->lock, flags);
1164         if (!list_empty(&ndev_ctx->reconfig_events)) {
1165                 event = list_first_entry(&ndev_ctx->reconfig_events,
1166                                          struct netvsc_reconfig, list);
1167                 list_del(&event->list);
1168                 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1169         }
1170         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1171
1172         if (!event)
1173                 goto out_unlock;
1174
1175         switch (event->event) {
1176                 /* Only the following events are possible due to the check in
1177                  * netvsc_linkstatus_callback()
1178                  */
1179         case RNDIS_STATUS_MEDIA_CONNECT:
1180                 if (rdev->link_state) {
1181                         rdev->link_state = false;
1182                         netif_carrier_on(net);
1183                         netif_tx_wake_all_queues(net);
1184                 } else {
1185                         notify = true;
1186                 }
1187                 kfree(event);
1188                 break;
1189         case RNDIS_STATUS_MEDIA_DISCONNECT:
1190                 if (!rdev->link_state) {
1191                         rdev->link_state = true;
1192                         netif_carrier_off(net);
1193                         netif_tx_stop_all_queues(net);
1194                 }
1195                 kfree(event);
1196                 break;
1197         case RNDIS_STATUS_NETWORK_CHANGE:
1198                 /* Only makes sense if carrier is present */
1199                 if (!rdev->link_state) {
1200                         rdev->link_state = true;
1201                         netif_carrier_off(net);
1202                         netif_tx_stop_all_queues(net);
1203                         event->event = RNDIS_STATUS_MEDIA_CONNECT;
1204                         spin_lock_irqsave(&ndev_ctx->lock, flags);
1205                         list_add(&event->list, &ndev_ctx->reconfig_events);
1206                         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1207                         reschedule = true;
1208                 }
1209                 break;
1210         }
1211
1212         rtnl_unlock();
1213
1214         if (notify)
1215                 netdev_notify_peers(net);
1216
1217         /* link_watch only sends one notification with current state per
1218          * second, handle next reconfig event in 2 seconds.
1219          */
1220         if (reschedule)
1221                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1222
1223         return;
1224
1225 out_unlock:
1226         rtnl_unlock();
1227 }
1228
1229 static void netvsc_free_netdev(struct net_device *netdev)
1230 {
1231         struct net_device_context *net_device_ctx = netdev_priv(netdev);
1232
1233         free_percpu(net_device_ctx->tx_stats);
1234         free_percpu(net_device_ctx->rx_stats);
1235         free_netdev(netdev);
1236 }
1237
1238 static struct net_device *get_netvsc_bymac(const u8 *mac)
1239 {
1240         struct net_device *dev;
1241
1242         ASSERT_RTNL();
1243
1244         for_each_netdev(&init_net, dev) {
1245                 if (dev->netdev_ops != &device_ops)
1246                         continue;       /* not a netvsc device */
1247
1248                 if (ether_addr_equal(mac, dev->perm_addr))
1249                         return dev;
1250         }
1251
1252         return NULL;
1253 }
1254
1255 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1256 {
1257         struct net_device *dev;
1258
1259         ASSERT_RTNL();
1260
1261         for_each_netdev(&init_net, dev) {
1262                 struct net_device_context *net_device_ctx;
1263
1264                 if (dev->netdev_ops != &device_ops)
1265                         continue;       /* not a netvsc device */
1266
1267                 net_device_ctx = netdev_priv(dev);
1268                 if (net_device_ctx->nvdev == NULL)
1269                         continue;       /* device is removed */
1270
1271                 if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev)
1272                         return dev;     /* a match */
1273         }
1274
1275         return NULL;
1276 }
1277
1278 static int netvsc_register_vf(struct net_device *vf_netdev)
1279 {
1280         struct net_device *ndev;
1281         struct net_device_context *net_device_ctx;
1282         struct netvsc_device *netvsc_dev;
1283
1284         if (vf_netdev->addr_len != ETH_ALEN)
1285                 return NOTIFY_DONE;
1286
1287         /*
1288          * We will use the MAC address to locate the synthetic interface to
1289          * associate with the VF interface. If we don't find a matching
1290          * synthetic interface, move on.
1291          */
1292         ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1293         if (!ndev)
1294                 return NOTIFY_DONE;
1295
1296         net_device_ctx = netdev_priv(ndev);
1297         netvsc_dev = net_device_ctx->nvdev;
1298         if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1299                 return NOTIFY_DONE;
1300
1301         netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1302         /*
1303          * Take a reference on the module.
1304          */
1305         try_module_get(THIS_MODULE);
1306
1307         dev_hold(vf_netdev);
1308         rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1309         return NOTIFY_OK;
1310 }
1311
1312 static int netvsc_vf_up(struct net_device *vf_netdev)
1313 {
1314         struct net_device *ndev;
1315         struct netvsc_device *netvsc_dev;
1316         struct net_device_context *net_device_ctx;
1317
1318         ndev = get_netvsc_byref(vf_netdev);
1319         if (!ndev)
1320                 return NOTIFY_DONE;
1321
1322         net_device_ctx = netdev_priv(ndev);
1323         netvsc_dev = net_device_ctx->nvdev;
1324
1325         netdev_info(ndev, "VF up: %s\n", vf_netdev->name);
1326
1327         /*
1328          * Open the device before switching data path.
1329          */
1330         rndis_filter_open(netvsc_dev);
1331
1332         /*
1333          * notify the host to switch the data path.
1334          */
1335         netvsc_switch_datapath(ndev, true);
1336         netdev_info(ndev, "Data path switched to VF: %s\n", vf_netdev->name);
1337
1338         netif_carrier_off(ndev);
1339
1340         /* Now notify peers through VF device. */
1341         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, vf_netdev);
1342
1343         return NOTIFY_OK;
1344 }
1345
1346 static int netvsc_vf_down(struct net_device *vf_netdev)
1347 {
1348         struct net_device *ndev;
1349         struct netvsc_device *netvsc_dev;
1350         struct net_device_context *net_device_ctx;
1351
1352         ndev = get_netvsc_byref(vf_netdev);
1353         if (!ndev)
1354                 return NOTIFY_DONE;
1355
1356         net_device_ctx = netdev_priv(ndev);
1357         netvsc_dev = net_device_ctx->nvdev;
1358
1359         netdev_info(ndev, "VF down: %s\n", vf_netdev->name);
1360         netvsc_switch_datapath(ndev, false);
1361         netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
1362         rndis_filter_close(netvsc_dev);
1363         netif_carrier_on(ndev);
1364
1365         /* Now notify peers through netvsc device. */
1366         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, ndev);
1367
1368         return NOTIFY_OK;
1369 }
1370
1371 static int netvsc_unregister_vf(struct net_device *vf_netdev)
1372 {
1373         struct net_device *ndev;
1374         struct netvsc_device *netvsc_dev;
1375         struct net_device_context *net_device_ctx;
1376
1377         ndev = get_netvsc_byref(vf_netdev);
1378         if (!ndev)
1379                 return NOTIFY_DONE;
1380
1381         net_device_ctx = netdev_priv(ndev);
1382         netvsc_dev = net_device_ctx->nvdev;
1383
1384         netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
1385
1386         RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
1387         dev_put(vf_netdev);
1388         module_put(THIS_MODULE);
1389         return NOTIFY_OK;
1390 }
1391
1392 static int netvsc_probe(struct hv_device *dev,
1393                         const struct hv_vmbus_device_id *dev_id)
1394 {
1395         struct net_device *net = NULL;
1396         struct net_device_context *net_device_ctx;
1397         struct netvsc_device_info device_info;
1398         struct netvsc_device *nvdev;
1399         int ret;
1400
1401         net = alloc_etherdev_mq(sizeof(struct net_device_context),
1402                                 VRSS_CHANNEL_MAX);
1403         if (!net)
1404                 return -ENOMEM;
1405
1406         netif_carrier_off(net);
1407
1408         netvsc_init_settings(net);
1409
1410         net_device_ctx = netdev_priv(net);
1411         net_device_ctx->device_ctx = dev;
1412         net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1413         if (netif_msg_probe(net_device_ctx))
1414                 netdev_dbg(net, "netvsc msg_enable: %d\n",
1415                            net_device_ctx->msg_enable);
1416
1417         net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1418         if (!net_device_ctx->tx_stats) {
1419                 free_netdev(net);
1420                 return -ENOMEM;
1421         }
1422         net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1423         if (!net_device_ctx->rx_stats) {
1424                 free_percpu(net_device_ctx->tx_stats);
1425                 free_netdev(net);
1426                 return -ENOMEM;
1427         }
1428
1429         hv_set_drvdata(dev, net);
1430
1431         net_device_ctx->start_remove = false;
1432
1433         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1434         INIT_WORK(&net_device_ctx->work, do_set_multicast);
1435
1436         spin_lock_init(&net_device_ctx->lock);
1437         INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1438
1439         net->netdev_ops = &device_ops;
1440         net->ethtool_ops = &ethtool_ops;
1441         SET_NETDEV_DEV(net, &dev->device);
1442
1443         /* We always need headroom for rndis header */
1444         net->needed_headroom = RNDIS_AND_PPI_SIZE;
1445
1446         /* Notify the netvsc driver of the new device */
1447         memset(&device_info, 0, sizeof(device_info));
1448         device_info.ring_size = ring_size;
1449         device_info.max_num_vrss_chns = min_t(u32, VRSS_CHANNEL_DEFAULT,
1450                                               num_online_cpus());
1451         ret = rndis_filter_device_add(dev, &device_info);
1452         if (ret != 0) {
1453                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1454                 netvsc_free_netdev(net);
1455                 hv_set_drvdata(dev, NULL);
1456                 return ret;
1457         }
1458         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1459
1460         /* hw_features computed in rndis_filter_device_add */
1461         net->features = net->hw_features |
1462                 NETIF_F_HIGHDMA | NETIF_F_SG |
1463                 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
1464         net->vlan_features = net->features;
1465
1466         nvdev = net_device_ctx->nvdev;
1467         netif_set_real_num_tx_queues(net, nvdev->num_chn);
1468         netif_set_real_num_rx_queues(net, nvdev->num_chn);
1469
1470         /* MTU range: 68 - 1500 or 65521 */
1471         net->min_mtu = NETVSC_MTU_MIN;
1472         if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
1473                 net->max_mtu = NETVSC_MTU - ETH_HLEN;
1474         else
1475                 net->max_mtu = ETH_DATA_LEN;
1476
1477         ret = register_netdev(net);
1478         if (ret != 0) {
1479                 pr_err("Unable to register netdev.\n");
1480                 rndis_filter_device_remove(dev);
1481                 netvsc_free_netdev(net);
1482         }
1483
1484         return ret;
1485 }
1486
1487 static int netvsc_remove(struct hv_device *dev)
1488 {
1489         struct net_device *net;
1490         struct net_device_context *ndev_ctx;
1491         struct netvsc_device *net_device;
1492
1493         net = hv_get_drvdata(dev);
1494
1495         if (net == NULL) {
1496                 dev_err(&dev->device, "No net device to remove\n");
1497                 return 0;
1498         }
1499
1500         ndev_ctx = netdev_priv(net);
1501         net_device = ndev_ctx->nvdev;
1502
1503         /* Avoid racing with netvsc_change_mtu()/netvsc_set_channels()
1504          * removing the device.
1505          */
1506         rtnl_lock();
1507         ndev_ctx->start_remove = true;
1508         rtnl_unlock();
1509
1510         cancel_delayed_work_sync(&ndev_ctx->dwork);
1511         cancel_work_sync(&ndev_ctx->work);
1512
1513         /* Stop outbound asap */
1514         netif_tx_disable(net);
1515
1516         unregister_netdev(net);
1517
1518         /*
1519          * Call to the vsc driver to let it know that the device is being
1520          * removed
1521          */
1522         rndis_filter_device_remove(dev);
1523
1524         hv_set_drvdata(dev, NULL);
1525
1526         netvsc_free_netdev(net);
1527         return 0;
1528 }
1529
1530 static const struct hv_vmbus_device_id id_table[] = {
1531         /* Network guid */
1532         { HV_NIC_GUID, },
1533         { },
1534 };
1535
1536 MODULE_DEVICE_TABLE(vmbus, id_table);
1537
1538 /* The one and only one */
1539 static struct  hv_driver netvsc_drv = {
1540         .name = KBUILD_MODNAME,
1541         .id_table = id_table,
1542         .probe = netvsc_probe,
1543         .remove = netvsc_remove,
1544 };
1545
1546 /*
1547  * On Hyper-V, every VF interface is matched with a corresponding
1548  * synthetic interface. The synthetic interface is presented first
1549  * to the guest. When the corresponding VF instance is registered,
1550  * we will take care of switching the data path.
1551  */
1552 static int netvsc_netdev_event(struct notifier_block *this,
1553                                unsigned long event, void *ptr)
1554 {
1555         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
1556
1557         /* Skip our own events */
1558         if (event_dev->netdev_ops == &device_ops)
1559                 return NOTIFY_DONE;
1560
1561         /* Avoid non-Ethernet type devices */
1562         if (event_dev->type != ARPHRD_ETHER)
1563                 return NOTIFY_DONE;
1564
1565         /* Avoid Vlan dev with same MAC registering as VF */
1566         if (event_dev->priv_flags & IFF_802_1Q_VLAN)
1567                 return NOTIFY_DONE;
1568
1569         /* Avoid Bonding master dev with same MAC registering as VF */
1570         if ((event_dev->priv_flags & IFF_BONDING) &&
1571             (event_dev->flags & IFF_MASTER))
1572                 return NOTIFY_DONE;
1573
1574         switch (event) {
1575         case NETDEV_REGISTER:
1576                 return netvsc_register_vf(event_dev);
1577         case NETDEV_UNREGISTER:
1578                 return netvsc_unregister_vf(event_dev);
1579         case NETDEV_UP:
1580                 return netvsc_vf_up(event_dev);
1581         case NETDEV_DOWN:
1582                 return netvsc_vf_down(event_dev);
1583         default:
1584                 return NOTIFY_DONE;
1585         }
1586 }
1587
1588 static struct notifier_block netvsc_netdev_notifier = {
1589         .notifier_call = netvsc_netdev_event,
1590 };
1591
1592 static void __exit netvsc_drv_exit(void)
1593 {
1594         unregister_netdevice_notifier(&netvsc_netdev_notifier);
1595         vmbus_driver_unregister(&netvsc_drv);
1596 }
1597
1598 static int __init netvsc_drv_init(void)
1599 {
1600         int ret;
1601
1602         if (ring_size < RING_SIZE_MIN) {
1603                 ring_size = RING_SIZE_MIN;
1604                 pr_info("Increased ring_size to %d (min allowed)\n",
1605                         ring_size);
1606         }
1607         ret = vmbus_driver_register(&netvsc_drv);
1608
1609         if (ret)
1610                 return ret;
1611
1612         register_netdevice_notifier(&netvsc_netdev_notifier);
1613         return 0;
1614 }
1615
1616 MODULE_LICENSE("GPL");
1617 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1618
1619 module_init(netvsc_drv_init);
1620 module_exit(netvsc_drv_exit);