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->chan_table[i].channel;
 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 /*
 195  * Select queue for transmit.
 196  *
 197  * If a valid queue has already been assigned, then use that.
 198  * Otherwise compute tx queue based on hash and the send table.
 199  *
 200  * This is basically similar to default (__netdev_pick_tx) with the added step
 201  * of using the host send_table when no other queue has been assigned.
 202  *
 203  * TODO support XPS - but get_xps_queue not exported
 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         struct sock *sk = skb->sk;
 211         int q_idx = sk_tx_queue_get(sk);
 212
 213         if (q_idx < 0 || skb->ooo_okay ||
 214             q_idx >= ndev->real_num_tx_queues) {
 215                 u16 hash = __skb_tx_hash(ndev, skb, VRSS_SEND_TAB_SIZE);
 216                 int new_idx;
 217
 218                 new_idx = nvsc_dev->send_table[hash]
 219                         % nvsc_dev->num_chn;
 220
 221                 if (q_idx != new_idx && sk &&
 222                     sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
 223                         sk_tx_queue_set(sk, new_idx);
 224
 225                 q_idx = new_idx;
 226         }
 227
 228         if (unlikely(!nvsc_dev->chan_table[q_idx].channel))
 229                 q_idx = 0;
 230
 231         return q_idx;
 232 }
 233
 234 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
 235                         struct hv_page_buffer *pb)
 236 {
 237         int j = 0;
 238
 239         /* Deal with compund pages by ignoring unused part
 240          * of the page.
 241          */
 242         page += (offset >> PAGE_SHIFT);
 243         offset &= ~PAGE_MASK;
 244
 245         while (len > 0) {
 246                 unsigned long bytes;
 247
 248                 bytes = PAGE_SIZE - offset;
 249                 if (bytes > len)
 250                         bytes = len;
 251                 pb[j].pfn = page_to_pfn(page);
 252                 pb[j].offset = offset;
 253                 pb[j].len = bytes;
 254
 255                 offset += bytes;
 256                 len -= bytes;
 257
 258                 if (offset == PAGE_SIZE && len) {
 259                         page++;
 260                         offset = 0;
 261                         j++;
 262                 }
 263         }
 264
 265         return j + 1;
 266 }
 267
 268 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
 269                            struct hv_netvsc_packet *packet,
 270                            struct hv_page_buffer **page_buf)
 271 {
 272         struct hv_page_buffer *pb = *page_buf;
 273         u32 slots_used = 0;
 274         char *data = skb->data;
 275         int frags = skb_shinfo(skb)->nr_frags;
 276         int i;
 277
 278         /* The packet is laid out thus:
 279          * 1. hdr: RNDIS header and PPI
 280          * 2. skb linear data
 281          * 3. skb fragment data
 282          */
 283         if (hdr != NULL)
 284                 slots_used += fill_pg_buf(virt_to_page(hdr),
 285                                         offset_in_page(hdr),
 286                                         len, &pb[slots_used]);
 287
 288         packet->rmsg_size = len;
 289         packet->rmsg_pgcnt = slots_used;
 290
 291         slots_used += fill_pg_buf(virt_to_page(data),
 292                                 offset_in_page(data),
 293                                 skb_headlen(skb), &pb[slots_used]);
 294
 295         for (i = 0; i < frags; i++) {
 296                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 297
 298                 slots_used += fill_pg_buf(skb_frag_page(frag),
 299                                         frag->page_offset,
 300                                         skb_frag_size(frag), &pb[slots_used]);
 301         }
 302         return slots_used;
 303 }
 304
 305 static int count_skb_frag_slots(struct sk_buff *skb)
 306 {
 307         int i, frags = skb_shinfo(skb)->nr_frags;
 308         int pages = 0;
 309
 310         for (i = 0; i < frags; i++) {
 311                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 312                 unsigned long size = skb_frag_size(frag);
 313                 unsigned long offset = frag->page_offset;
 314
 315                 /* Skip unused frames from start of page */
 316                 offset &= ~PAGE_MASK;
 317                 pages += PFN_UP(offset + size);
 318         }
 319         return pages;
 320 }
 321
 322 static int netvsc_get_slots(struct sk_buff *skb)
 323 {
 324         char *data = skb->data;
 325         unsigned int offset = offset_in_page(data);
 326         unsigned int len = skb_headlen(skb);
 327         int slots;
 328         int frag_slots;
 329
 330         slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
 331         frag_slots = count_skb_frag_slots(skb);
 332         return slots + frag_slots;
 333 }
 334
 335 static u32 net_checksum_info(struct sk_buff *skb)
 336 {
 337         if (skb->protocol == htons(ETH_P_IP)) {
 338                 struct iphdr *ip = ip_hdr(skb);
 339
 340                 if (ip->protocol == IPPROTO_TCP)
 341                         return TRANSPORT_INFO_IPV4_TCP;
 342                 else if (ip->protocol == IPPROTO_UDP)
 343                         return TRANSPORT_INFO_IPV4_UDP;
 344         } else {
 345                 struct ipv6hdr *ip6 = ipv6_hdr(skb);
 346
 347                 if (ip6->nexthdr == IPPROTO_TCP)
 348                         return TRANSPORT_INFO_IPV6_TCP;
 349                 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
 350                         return TRANSPORT_INFO_IPV6_UDP;
 351         }
 352
 353         return TRANSPORT_INFO_NOT_IP;
 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         u32 hash;
 367         struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
 368         struct hv_page_buffer *pb = page_buf;
 369
 370         /* We will atmost need two pages to describe the rndis
 371          * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
 372          * of pages in a single packet. If skb is scattered around
 373          * more pages we try linearizing it.
 374          */
 375
 376         num_data_pgs = netvsc_get_slots(skb) + 2;
 377
 378         if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
 379                 ++net_device_ctx->eth_stats.tx_scattered;
 380
 381                 if (skb_linearize(skb))
 382                         goto no_memory;
 383
 384                 num_data_pgs = netvsc_get_slots(skb) + 2;
 385                 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
 386                         ++net_device_ctx->eth_stats.tx_too_big;
 387                         goto drop;
 388                 }
 389         }
 390
 391         /*
 392          * Place the rndis header in the skb head room and
 393          * the skb->cb will be used for hv_netvsc_packet
 394          * structure.
 395          */
 396         ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
 397         if (ret)
 398                 goto no_memory;
 399
 400         /* Use the skb control buffer for building up the packet */
 401         BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
 402                         FIELD_SIZEOF(struct sk_buff, cb));
 403         packet = (struct hv_netvsc_packet *)skb->cb;
 404
 405         packet->q_idx = skb_get_queue_mapping(skb);
 406
 407         packet->total_data_buflen = skb->len;
 408         packet->total_bytes = skb->len;
 409         packet->total_packets = 1;
 410
 411         rndis_msg = (struct rndis_message *)skb->head;
 412
 413         memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
 414
 415         /* Add the rndis header */
 416         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 417         rndis_msg->msg_len = packet->total_data_buflen;
 418         rndis_pkt = &rndis_msg->msg.pkt;
 419         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 420         rndis_pkt->data_len = packet->total_data_buflen;
 421         rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 422
 423         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 424
 425         hash = skb_get_hash_raw(skb);
 426         if (hash != 0 && net->real_num_tx_queues > 1) {
 427                 rndis_msg_size += NDIS_HASH_PPI_SIZE;
 428                 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
 429                                     NBL_HASH_VALUE);
 430                 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
 431         }
 432
 433         if (skb_vlan_tag_present(skb)) {
 434                 struct ndis_pkt_8021q_info *vlan;
 435
 436                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 437                 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
 438                                         IEEE_8021Q_INFO);
 439                 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
 440                                                 ppi->ppi_offset);
 441                 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
 442                 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
 443                                 VLAN_PRIO_SHIFT;
 444         }
 445
 446         if (skb_is_gso(skb)) {
 447                 struct ndis_tcp_lso_info *lso_info;
 448
 449                 rndis_msg_size += NDIS_LSO_PPI_SIZE;
 450                 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
 451                                     TCP_LARGESEND_PKTINFO);
 452
 453                 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
 454                                                         ppi->ppi_offset);
 455
 456                 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
 457                 if (skb->protocol == htons(ETH_P_IP)) {
 458                         lso_info->lso_v2_transmit.ip_version =
 459                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
 460                         ip_hdr(skb)->tot_len = 0;
 461                         ip_hdr(skb)->check = 0;
 462                         tcp_hdr(skb)->check =
 463                                 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 464                                                    ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 465                 } else {
 466                         lso_info->lso_v2_transmit.ip_version =
 467                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
 468                         ipv6_hdr(skb)->payload_len = 0;
 469                         tcp_hdr(skb)->check =
 470                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 471                                                  &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 472                 }
 473                 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
 474                 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 475         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 476                 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
 477                         struct ndis_tcp_ip_checksum_info *csum_info;
 478
 479                         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 480                         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 481                                             TCPIP_CHKSUM_PKTINFO);
 482
 483                         csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 484                                                                          ppi->ppi_offset);
 485
 486                         csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
 487
 488                         if (skb->protocol == htons(ETH_P_IP)) {
 489                                 csum_info->transmit.is_ipv4 = 1;
 490
 491                                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 492                                         csum_info->transmit.tcp_checksum = 1;
 493                                 else
 494                                         csum_info->transmit.udp_checksum = 1;
 495                         } else {
 496                                 csum_info->transmit.is_ipv6 = 1;
 497
 498                                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
 499                                         csum_info->transmit.tcp_checksum = 1;
 500                                 else
 501                                         csum_info->transmit.udp_checksum = 1;
 502                         }
 503                 } else {
 504                         /* Can't do offload of this type of checksum */
 505                         if (skb_checksum_help(skb))
 506                                 goto drop;
 507                 }
 508         }
 509
 510         /* Start filling in the page buffers with the rndis hdr */
 511         rndis_msg->msg_len += rndis_msg_size;
 512         packet->total_data_buflen = rndis_msg->msg_len;
 513         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 514                                                skb, packet, &pb);
 515
 516         /* timestamp packet in software */
 517         skb_tx_timestamp(skb);
 518         ret = netvsc_send(net_device_ctx->device_ctx, packet,
 519                           rndis_msg, &pb, skb);
 520         if (likely(ret == 0))
 521                 return NETDEV_TX_OK;
 522
 523         if (ret == -EAGAIN) {
 524                 ++net_device_ctx->eth_stats.tx_busy;
 525                 return NETDEV_TX_BUSY;
 526         }
 527
 528         if (ret == -ENOSPC)
 529                 ++net_device_ctx->eth_stats.tx_no_space;
 530
 531 drop:
 532         dev_kfree_skb_any(skb);
 533         net->stats.tx_dropped++;
 534
 535         return NETDEV_TX_OK;
 536
 537 no_memory:
 538         ++net_device_ctx->eth_stats.tx_no_memory;
 539         goto drop;
 540 }
 541 /*
 542  * netvsc_linkstatus_callback - Link up/down notification
 543  */
 544 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 545                                 struct rndis_message *resp)
 546 {
 547         struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
 548         struct net_device *net;
 549         struct net_device_context *ndev_ctx;
 550         struct netvsc_reconfig *event;
 551         unsigned long flags;
 552
 553         net = hv_get_drvdata(device_obj);
 554
 555         if (!net)
 556                 return;
 557
 558         ndev_ctx = netdev_priv(net);
 559
 560         /* Update the physical link speed when changing to another vSwitch */
 561         if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
 562                 u32 speed;
 563
 564                 speed = *(u32 *)((void *)indicate + indicate->
 565                                  status_buf_offset) / 10000;
 566                 ndev_ctx->speed = speed;
 567                 return;
 568         }
 569
 570         /* Handle these link change statuses below */
 571         if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
 572             indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
 573             indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
 574                 return;
 575
 576         if (net->reg_state != NETREG_REGISTERED)
 577                 return;
 578
 579         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 580         if (!event)
 581                 return;
 582         event->event = indicate->status;
 583
 584         spin_lock_irqsave(&ndev_ctx->lock, flags);
 585         list_add_tail(&event->list, &ndev_ctx->reconfig_events);
 586         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
 587
 588         schedule_delayed_work(&ndev_ctx->dwork, 0);
 589 }
 590
 591 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 592                                              const struct ndis_tcp_ip_checksum_info *csum_info,
 593                                              const struct ndis_pkt_8021q_info *vlan,
 594                                              void *data, u32 buflen)
 595 {
 596         struct sk_buff *skb;
 597
 598         skb = netdev_alloc_skb_ip_align(net, buflen);
 599         if (!skb)
 600                 return skb;
 601
 602         /*
 603          * Copy to skb. This copy is needed here since the memory pointed by
 604          * hv_netvsc_packet cannot be deallocated
 605          */
 606         memcpy(skb_put(skb, buflen), data, buflen);
 607
 608         skb->protocol = eth_type_trans(skb, net);
 609
 610         /* skb is already created with CHECKSUM_NONE */
 611         skb_checksum_none_assert(skb);
 612
 613         /*
 614          * In Linux, the IP checksum is always checked.
 615          * Do L4 checksum offload if enabled and present.
 616          */
 617         if (csum_info && (net->features & NETIF_F_RXCSUM)) {
 618                 if (csum_info->receive.tcp_checksum_succeeded ||
 619                     csum_info->receive.udp_checksum_succeeded)
 620                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 621         }
 622
 623         if (vlan) {
 624                 u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
 625
 626                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 627                                        vlan_tci);
 628         }
 629
 630         return skb;
 631 }
 632
 633 /*
 634  * netvsc_recv_callback -  Callback when we receive a packet from the
 635  * "wire" on the specified device.
 636  */
 637 int netvsc_recv_callback(struct net_device *net,
 638                          struct vmbus_channel *channel,
 639                          void  *data, u32 len,
 640                          const struct ndis_tcp_ip_checksum_info *csum_info,
 641                          const struct ndis_pkt_8021q_info *vlan)
 642 {
 643         struct net_device_context *net_device_ctx = netdev_priv(net);
 644         struct netvsc_device *net_device = net_device_ctx->nvdev;
 645         struct net_device *vf_netdev;
 646         struct sk_buff *skb;
 647         struct netvsc_stats *rx_stats;
 648         u16 q_idx = channel->offermsg.offer.sub_channel_index;
 649
 650
 651         if (net->reg_state != NETREG_REGISTERED)
 652                 return NVSP_STAT_FAIL;
 653
 654         /*
 655          * If necessary, inject this packet into the VF interface.
 656          * On Hyper-V, multicast and brodcast packets are only delivered
 657          * to the synthetic interface (after subjecting these to
 658          * policy filters on the host). Deliver these via the VF
 659          * interface in the guest.
 660          */
 661         rcu_read_lock();
 662         vf_netdev = rcu_dereference(net_device_ctx->vf_netdev);
 663         if (vf_netdev && (vf_netdev->flags & IFF_UP))
 664                 net = vf_netdev;
 665
 666         /* Allocate a skb - TODO direct I/O to pages? */
 667         skb = netvsc_alloc_recv_skb(net, csum_info, vlan, data, len);
 668         if (unlikely(!skb)) {
 669                 ++net->stats.rx_dropped;
 670                 rcu_read_unlock();
 671                 return NVSP_STAT_FAIL;
 672         }
 673
 674         if (net != vf_netdev)
 675                 skb_record_rx_queue(skb, q_idx);
 676
 677         /*
 678          * Even if injecting the packet, record the statistics
 679          * on the synthetic device because modifying the VF device
 680          * statistics will not work correctly.
 681          */
 682         rx_stats = &net_device->chan_table[q_idx].rx_stats;
 683         u64_stats_update_begin(&rx_stats->syncp);
 684         rx_stats->packets++;
 685         rx_stats->bytes += len;
 686
 687         if (skb->pkt_type == PACKET_BROADCAST)
 688                 ++rx_stats->broadcast;
 689         else if (skb->pkt_type == PACKET_MULTICAST)
 690                 ++rx_stats->multicast;
 691         u64_stats_update_end(&rx_stats->syncp);
 692
 693         /*
 694          * Pass the skb back up. Network stack will deallocate the skb when it
 695          * is done.
 696          * TODO - use NAPI?
 697          */
 698         netif_receive_skb(skb);
 699         rcu_read_unlock();
 700
 701         return 0;
 702 }
 703
 704 static void netvsc_get_drvinfo(struct net_device *net,
 705                                struct ethtool_drvinfo *info)
 706 {
 707         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 708         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 709 }
 710
 711 static void netvsc_get_channels(struct net_device *net,
 712                                 struct ethtool_channels *channel)
 713 {
 714         struct net_device_context *net_device_ctx = netdev_priv(net);
 715         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 716
 717         if (nvdev) {
 718                 channel->max_combined   = nvdev->max_chn;
 719                 channel->combined_count = nvdev->num_chn;
 720         }
 721 }
 722
 723 static int netvsc_set_queues(struct net_device *net, struct hv_device *dev,
 724                              u32 num_chn)
 725 {
 726         struct netvsc_device_info device_info;
 727         int ret;
 728
 729         memset(&device_info, 0, sizeof(device_info));
 730         device_info.num_chn = num_chn;
 731         device_info.ring_size = ring_size;
 732         device_info.max_num_vrss_chns = num_chn;
 733
 734         ret = rndis_filter_device_add(dev, &device_info);
 735         if (ret)
 736                 return ret;
 737
 738         ret = netif_set_real_num_tx_queues(net, num_chn);
 739         if (ret)
 740                 return ret;
 741
 742         ret = netif_set_real_num_rx_queues(net, num_chn);
 743
 744         return ret;
 745 }
 746
 747 static int netvsc_set_channels(struct net_device *net,
 748                                struct ethtool_channels *channels)
 749 {
 750         struct net_device_context *net_device_ctx = netdev_priv(net);
 751         struct hv_device *dev = net_device_ctx->device_ctx;
 752         struct netvsc_device *nvdev = net_device_ctx->nvdev;
 753         unsigned int count = channels->combined_count;
 754         int ret;
 755
 756         /* We do not support separate count for rx, tx, or other */
 757         if (count == 0 ||
 758             channels->rx_count || channels->tx_count || channels->other_count)
 759                 return -EINVAL;
 760
 761         if (count > net->num_tx_queues || count > net->num_rx_queues)
 762                 return -EINVAL;
 763
 764         if (net_device_ctx->start_remove || !nvdev || nvdev->destroy)
 765                 return -ENODEV;
 766
 767         if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
 768                 return -EINVAL;
 769
 770         if (count > nvdev->max_chn)
 771                 return -EINVAL;
 772
 773         ret = netvsc_close(net);
 774         if (ret)
 775                 return ret;
 776
 777         net_device_ctx->start_remove = true;
 778         rndis_filter_device_remove(dev, nvdev);
 779
 780         ret = netvsc_set_queues(net, dev, count);
 781         if (ret == 0)
 782                 nvdev->num_chn = count;
 783         else
 784                 netvsc_set_queues(net, dev, nvdev->num_chn);
 785
 786         netvsc_open(net);
 787         net_device_ctx->start_remove = false;
 788
 789         /* We may have missed link change notifications */
 790         schedule_delayed_work(&net_device_ctx->dwork, 0);
 791
 792         return ret;
 793 }
 794
 795 static bool netvsc_validate_ethtool_ss_cmd(const struct ethtool_cmd *cmd)
 796 {
 797         struct ethtool_cmd diff1 = *cmd;
 798         struct ethtool_cmd diff2 = {};
 799
 800         ethtool_cmd_speed_set(&diff1, 0);
 801         diff1.duplex = 0;
 802         /* advertising and cmd are usually set */
 803         diff1.advertising = 0;
 804         diff1.cmd = 0;
 805         /* We set port to PORT_OTHER */
 806         diff2.port = PORT_OTHER;
 807
 808         return !memcmp(&diff1, &diff2, sizeof(diff1));
 809 }
 810
 811 static void netvsc_init_settings(struct net_device *dev)
 812 {
 813         struct net_device_context *ndc = netdev_priv(dev);
 814
 815         ndc->speed = SPEED_UNKNOWN;
 816         ndc->duplex = DUPLEX_UNKNOWN;
 817 }
 818
 819 static int netvsc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 820 {
 821         struct net_device_context *ndc = netdev_priv(dev);
 822
 823         ethtool_cmd_speed_set(cmd, ndc->speed);
 824         cmd->duplex = ndc->duplex;
 825         cmd->port = PORT_OTHER;
 826
 827         return 0;
 828 }
 829
 830 static int netvsc_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 831 {
 832         struct net_device_context *ndc = netdev_priv(dev);
 833         u32 speed;
 834
 835         speed = ethtool_cmd_speed(cmd);
 836         if (!ethtool_validate_speed(speed) ||
 837             !ethtool_validate_duplex(cmd->duplex) ||
 838             !netvsc_validate_ethtool_ss_cmd(cmd))
 839                 return -EINVAL;
 840
 841         ndc->speed = speed;
 842         ndc->duplex = cmd->duplex;
 843
 844         return 0;
 845 }
 846
 847 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 848 {
 849         struct net_device_context *ndevctx = netdev_priv(ndev);
 850         struct netvsc_device *nvdev = ndevctx->nvdev;
 851         struct hv_device *hdev = ndevctx->device_ctx;
 852         struct netvsc_device_info device_info;
 853         int ret;
 854
 855         if (ndevctx->start_remove || !nvdev || nvdev->destroy)
 856                 return -ENODEV;
 857
 858         ret = netvsc_close(ndev);
 859         if (ret)
 860                 goto out;
 861
 862         memset(&device_info, 0, sizeof(device_info));
 863         device_info.ring_size = ring_size;
 864         device_info.num_chn = nvdev->num_chn;
 865         device_info.max_num_vrss_chns = nvdev->num_chn;
 866
 867         ndevctx->start_remove = true;
 868         rndis_filter_device_remove(hdev, nvdev);
 869
 870         /* 'nvdev' has been freed in rndis_filter_device_remove() ->
 871          * netvsc_device_remove () -> free_netvsc_device().
 872          * We mustn't access it before it's re-created in
 873          * rndis_filter_device_add() -> netvsc_device_add().
 874          */
 875
 876         ndev->mtu = mtu;
 877
 878         rndis_filter_device_add(hdev, &device_info);
 879
 880 out:
 881         netvsc_open(ndev);
 882         ndevctx->start_remove = false;
 883
 884         /* We may have missed link change notifications */
 885         schedule_delayed_work(&ndevctx->dwork, 0);
 886
 887         return ret;
 888 }
 889
 890 static void netvsc_get_stats64(struct net_device *net,
 891                                struct rtnl_link_stats64 *t)
 892 {
 893         struct net_device_context *ndev_ctx = netdev_priv(net);
 894         struct netvsc_device *nvdev = ndev_ctx->nvdev;
 895         int i;
 896
 897         if (!nvdev)
 898                 return;
 899
 900         for (i = 0; i < nvdev->num_chn; i++) {
 901                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
 902                 const struct netvsc_stats *stats;
 903                 u64 packets, bytes, multicast;
 904                 unsigned int start;
 905
 906                 stats = &nvchan->tx_stats;
 907                 do {
 908                         start = u64_stats_fetch_begin_irq(&stats->syncp);
 909                         packets = stats->packets;
 910                         bytes = stats->bytes;
 911                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
 912
 913                 t->tx_bytes     += bytes;
 914                 t->tx_packets   += packets;
 915
 916                 stats = &nvchan->rx_stats;
 917                 do {
 918                         start = u64_stats_fetch_begin_irq(&stats->syncp);
 919                         packets = stats->packets;
 920                         bytes = stats->bytes;
 921                         multicast = stats->multicast + stats->broadcast;
 922                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
 923
 924                 t->rx_bytes     += bytes;
 925                 t->rx_packets   += packets;
 926                 t->multicast    += multicast;
 927         }
 928
 929         t->tx_dropped   = net->stats.tx_dropped;
 930         t->tx_errors    = net->stats.tx_errors;
 931
 932         t->rx_dropped   = net->stats.rx_dropped;
 933         t->rx_errors    = net->stats.rx_errors;
 934 }
 935
 936 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
 937 {
 938         struct sockaddr *addr = p;
 939         char save_adr[ETH_ALEN];
 940         unsigned char save_aatype;
 941         int err;
 942
 943         memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
 944         save_aatype = ndev->addr_assign_type;
 945
 946         err = eth_mac_addr(ndev, p);
 947         if (err != 0)
 948                 return err;
 949
 950         err = rndis_filter_set_device_mac(ndev, addr->sa_data);
 951         if (err != 0) {
 952                 /* roll back to saved MAC */
 953                 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
 954                 ndev->addr_assign_type = save_aatype;
 955         }
 956
 957         return err;
 958 }
 959
 960 static const struct {
 961         char name[ETH_GSTRING_LEN];
 962         u16 offset;
 963 } netvsc_stats[] = {
 964         { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
 965         { "tx_no_memory",  offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
 966         { "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },
 967         { "tx_too_big",   offsetof(struct netvsc_ethtool_stats, tx_too_big) },
 968         { "tx_busy",      offsetof(struct netvsc_ethtool_stats, tx_busy) },
 969 };
 970
 971 #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats)
 972
 973 /* 4 statistics per queue (rx/tx packets/bytes) */
 974 #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4)
 975
 976 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
 977 {
 978         struct net_device_context *ndc = netdev_priv(dev);
 979         struct netvsc_device *nvdev = ndc->nvdev;
 980
 981         switch (string_set) {
 982         case ETH_SS_STATS:
 983                 return NETVSC_GLOBAL_STATS_LEN + NETVSC_QUEUE_STATS_LEN(nvdev);
 984         default:
 985                 return -EINVAL;
 986         }
 987 }
 988
 989 static void netvsc_get_ethtool_stats(struct net_device *dev,
 990                                      struct ethtool_stats *stats, u64 *data)
 991 {
 992         struct net_device_context *ndc = netdev_priv(dev);
 993         struct netvsc_device *nvdev = ndc->nvdev;
 994         const void *nds = &ndc->eth_stats;
 995         const struct netvsc_stats *qstats;
 996         unsigned int start;
 997         u64 packets, bytes;
 998         int i, j;
 999
1000         for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
1001                 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1002
1003         for (j = 0; j < nvdev->num_chn; j++) {
1004                 qstats = &nvdev->chan_table[j].tx_stats;
1005
1006                 do {
1007                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1008                         packets = qstats->packets;
1009                         bytes = qstats->bytes;
1010                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1011                 data[i++] = packets;
1012                 data[i++] = bytes;
1013
1014                 qstats = &nvdev->chan_table[j].rx_stats;
1015                 do {
1016                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1017                         packets = qstats->packets;
1018                         bytes = qstats->bytes;
1019                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1020                 data[i++] = packets;
1021                 data[i++] = bytes;
1022         }
1023 }
1024
1025 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1026 {
1027         struct net_device_context *ndc = netdev_priv(dev);
1028         struct netvsc_device *nvdev = ndc->nvdev;
1029         u8 *p = data;
1030         int i;
1031
1032         switch (stringset) {
1033         case ETH_SS_STATS:
1034                 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)
1035                         memcpy(p + i * ETH_GSTRING_LEN,
1036                                netvsc_stats[i].name, ETH_GSTRING_LEN);
1037
1038                 p += i * ETH_GSTRING_LEN;
1039                 for (i = 0; i < nvdev->num_chn; i++) {
1040                         sprintf(p, "tx_queue_%u_packets", i);
1041                         p += ETH_GSTRING_LEN;
1042                         sprintf(p, "tx_queue_%u_bytes", i);
1043                         p += ETH_GSTRING_LEN;
1044                         sprintf(p, "rx_queue_%u_packets", i);
1045                         p += ETH_GSTRING_LEN;
1046                         sprintf(p, "rx_queue_%u_bytes", i);
1047                         p += ETH_GSTRING_LEN;
1048                 }
1049
1050                 break;
1051         }
1052 }
1053
1054 static int
1055 netvsc_get_rss_hash_opts(struct netvsc_device *nvdev,
1056                          struct ethtool_rxnfc *info)
1057 {
1058         info->data = RXH_IP_SRC | RXH_IP_DST;
1059
1060         switch (info->flow_type) {
1061         case TCP_V4_FLOW:
1062         case TCP_V6_FLOW:
1063                 info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
1064                 /* fallthrough */
1065         case UDP_V4_FLOW:
1066         case UDP_V6_FLOW:
1067         case IPV4_FLOW:
1068         case IPV6_FLOW:
1069                 break;
1070         default:
1071                 info->data = 0;
1072                 break;
1073         }
1074
1075         return 0;
1076 }
1077
1078 static int
1079 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1080                  u32 *rules)
1081 {
1082         struct net_device_context *ndc = netdev_priv(dev);
1083         struct netvsc_device *nvdev = ndc->nvdev;
1084
1085         switch (info->cmd) {
1086         case ETHTOOL_GRXRINGS:
1087                 info->data = nvdev->num_chn;
1088                 return 0;
1089
1090         case ETHTOOL_GRXFH:
1091                 return netvsc_get_rss_hash_opts(nvdev, info);
1092         }
1093         return -EOPNOTSUPP;
1094 }
1095
1096 #ifdef CONFIG_NET_POLL_CONTROLLER
1097 static void netvsc_poll_controller(struct net_device *net)
1098 {
1099         /* As netvsc_start_xmit() works synchronous we don't have to
1100          * trigger anything here.
1101          */
1102 }
1103 #endif
1104
1105 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1106 {
1107         return NETVSC_HASH_KEYLEN;
1108 }
1109
1110 static u32 netvsc_rss_indir_size(struct net_device *dev)
1111 {
1112         return ITAB_NUM;
1113 }
1114
1115 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1116                            u8 *hfunc)
1117 {
1118         struct net_device_context *ndc = netdev_priv(dev);
1119         struct netvsc_device *ndev = ndc->nvdev;
1120         struct rndis_device *rndis_dev = ndev->extension;
1121         int i;
1122
1123         if (hfunc)
1124                 *hfunc = ETH_RSS_HASH_TOP;      /* Toeplitz */
1125
1126         if (indir) {
1127                 for (i = 0; i < ITAB_NUM; i++)
1128                         indir[i] = rndis_dev->ind_table[i];
1129         }
1130
1131         if (key)
1132                 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1133
1134         return 0;
1135 }
1136
1137 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1138                            const u8 *key, const u8 hfunc)
1139 {
1140         struct net_device_context *ndc = netdev_priv(dev);
1141         struct netvsc_device *ndev = ndc->nvdev;
1142         struct rndis_device *rndis_dev = ndev->extension;
1143         int i;
1144
1145         if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1146                 return -EOPNOTSUPP;
1147
1148         if (indir) {
1149                 for (i = 0; i < ITAB_NUM; i++)
1150                         if (indir[i] >= dev->num_rx_queues)
1151                                 return -EINVAL;
1152
1153                 for (i = 0; i < ITAB_NUM; i++)
1154                         rndis_dev->ind_table[i] = indir[i];
1155         }
1156
1157         if (!key) {
1158                 if (!indir)
1159                         return 0;
1160
1161                 key = rndis_dev->rss_key;
1162         }
1163
1164         return rndis_filter_set_rss_param(rndis_dev, key, ndev->num_chn);
1165 }
1166
1167 static const struct ethtool_ops ethtool_ops = {
1168         .get_drvinfo    = netvsc_get_drvinfo,
1169         .get_link       = ethtool_op_get_link,
1170         .get_ethtool_stats = netvsc_get_ethtool_stats,
1171         .get_sset_count = netvsc_get_sset_count,
1172         .get_strings    = netvsc_get_strings,
1173         .get_channels   = netvsc_get_channels,
1174         .set_channels   = netvsc_set_channels,
1175         .get_ts_info    = ethtool_op_get_ts_info,
1176         .get_settings   = netvsc_get_settings,
1177         .set_settings   = netvsc_set_settings,
1178         .get_rxnfc      = netvsc_get_rxnfc,
1179         .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1180         .get_rxfh_indir_size = netvsc_rss_indir_size,
1181         .get_rxfh       = netvsc_get_rxfh,
1182         .set_rxfh       = netvsc_set_rxfh,
1183 };
1184
1185 static const struct net_device_ops device_ops = {
1186         .ndo_open =                     netvsc_open,
1187         .ndo_stop =                     netvsc_close,
1188         .ndo_start_xmit =               netvsc_start_xmit,
1189         .ndo_set_rx_mode =              netvsc_set_multicast_list,
1190         .ndo_change_mtu =               netvsc_change_mtu,
1191         .ndo_validate_addr =            eth_validate_addr,
1192         .ndo_set_mac_address =          netvsc_set_mac_addr,
1193         .ndo_select_queue =             netvsc_select_queue,
1194         .ndo_get_stats64 =              netvsc_get_stats64,
1195 #ifdef CONFIG_NET_POLL_CONTROLLER
1196         .ndo_poll_controller =          netvsc_poll_controller,
1197 #endif
1198 };
1199
1200 /*
1201  * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1202  * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1203  * present send GARP packet to network peers with netif_notify_peers().
1204  */
1205 static void netvsc_link_change(struct work_struct *w)
1206 {
1207         struct net_device_context *ndev_ctx =
1208                 container_of(w, struct net_device_context, dwork.work);
1209         struct hv_device *device_obj = ndev_ctx->device_ctx;
1210         struct net_device *net = hv_get_drvdata(device_obj);
1211         struct netvsc_device *net_device;
1212         struct rndis_device *rdev;
1213         struct netvsc_reconfig *event = NULL;
1214         bool notify = false, reschedule = false;
1215         unsigned long flags, next_reconfig, delay;
1216
1217         rtnl_lock();
1218         if (ndev_ctx->start_remove)
1219                 goto out_unlock;
1220
1221         net_device = ndev_ctx->nvdev;
1222         rdev = net_device->extension;
1223
1224         next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1225         if (time_is_after_jiffies(next_reconfig)) {
1226                 /* link_watch only sends one notification with current state
1227                  * per second, avoid doing reconfig more frequently. Handle
1228                  * wrap around.
1229                  */
1230                 delay = next_reconfig - jiffies;
1231                 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1232                 schedule_delayed_work(&ndev_ctx->dwork, delay);
1233                 goto out_unlock;
1234         }
1235         ndev_ctx->last_reconfig = jiffies;
1236
1237         spin_lock_irqsave(&ndev_ctx->lock, flags);
1238         if (!list_empty(&ndev_ctx->reconfig_events)) {
1239                 event = list_first_entry(&ndev_ctx->reconfig_events,
1240                                          struct netvsc_reconfig, list);
1241                 list_del(&event->list);
1242                 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1243         }
1244         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1245
1246         if (!event)
1247                 goto out_unlock;
1248
1249         switch (event->event) {
1250                 /* Only the following events are possible due to the check in
1251                  * netvsc_linkstatus_callback()
1252                  */
1253         case RNDIS_STATUS_MEDIA_CONNECT:
1254                 if (rdev->link_state) {
1255                         rdev->link_state = false;
1256                         netif_carrier_on(net);
1257                         netif_tx_wake_all_queues(net);
1258                 } else {
1259                         notify = true;
1260                 }
1261                 kfree(event);
1262                 break;
1263         case RNDIS_STATUS_MEDIA_DISCONNECT:
1264                 if (!rdev->link_state) {
1265                         rdev->link_state = true;
1266                         netif_carrier_off(net);
1267                         netif_tx_stop_all_queues(net);
1268                 }
1269                 kfree(event);
1270                 break;
1271         case RNDIS_STATUS_NETWORK_CHANGE:
1272                 /* Only makes sense if carrier is present */
1273                 if (!rdev->link_state) {
1274                         rdev->link_state = true;
1275                         netif_carrier_off(net);
1276                         netif_tx_stop_all_queues(net);
1277                         event->event = RNDIS_STATUS_MEDIA_CONNECT;
1278                         spin_lock_irqsave(&ndev_ctx->lock, flags);
1279                         list_add(&event->list, &ndev_ctx->reconfig_events);
1280                         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1281                         reschedule = true;
1282                 }
1283                 break;
1284         }
1285
1286         rtnl_unlock();
1287
1288         if (notify)
1289                 netdev_notify_peers(net);
1290
1291         /* link_watch only sends one notification with current state per
1292          * second, handle next reconfig event in 2 seconds.
1293          */
1294         if (reschedule)
1295                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1296
1297         return;
1298
1299 out_unlock:
1300         rtnl_unlock();
1301 }
1302
1303 static struct net_device *get_netvsc_bymac(const u8 *mac)
1304 {
1305         struct net_device *dev;
1306
1307         ASSERT_RTNL();
1308
1309         for_each_netdev(&init_net, dev) {
1310                 if (dev->netdev_ops != &device_ops)
1311                         continue;       /* not a netvsc device */
1312
1313                 if (ether_addr_equal(mac, dev->perm_addr))
1314                         return dev;
1315         }
1316
1317         return NULL;
1318 }
1319
1320 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1321 {
1322         struct net_device *dev;
1323
1324         ASSERT_RTNL();
1325
1326         for_each_netdev(&init_net, dev) {
1327                 struct net_device_context *net_device_ctx;
1328
1329                 if (dev->netdev_ops != &device_ops)
1330                         continue;       /* not a netvsc device */
1331
1332                 net_device_ctx = netdev_priv(dev);
1333                 if (net_device_ctx->nvdev == NULL)
1334                         continue;       /* device is removed */
1335
1336                 if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev)
1337                         return dev;     /* a match */
1338         }
1339
1340         return NULL;
1341 }
1342
1343 static int netvsc_register_vf(struct net_device *vf_netdev)
1344 {
1345         struct net_device *ndev;
1346         struct net_device_context *net_device_ctx;
1347         struct netvsc_device *netvsc_dev;
1348
1349         if (vf_netdev->addr_len != ETH_ALEN)
1350                 return NOTIFY_DONE;
1351
1352         /*
1353          * We will use the MAC address to locate the synthetic interface to
1354          * associate with the VF interface. If we don't find a matching
1355          * synthetic interface, move on.
1356          */
1357         ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1358         if (!ndev)
1359                 return NOTIFY_DONE;
1360
1361         net_device_ctx = netdev_priv(ndev);
1362         netvsc_dev = net_device_ctx->nvdev;
1363         if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1364                 return NOTIFY_DONE;
1365
1366         netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1367         /*
1368          * Take a reference on the module.
1369          */
1370         try_module_get(THIS_MODULE);
1371
1372         dev_hold(vf_netdev);
1373         rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1374         return NOTIFY_OK;
1375 }
1376
1377 static int netvsc_vf_up(struct net_device *vf_netdev)
1378 {
1379         struct net_device *ndev;
1380         struct netvsc_device *netvsc_dev;
1381         struct net_device_context *net_device_ctx;
1382
1383         ndev = get_netvsc_byref(vf_netdev);
1384         if (!ndev)
1385                 return NOTIFY_DONE;
1386
1387         net_device_ctx = netdev_priv(ndev);
1388         netvsc_dev = net_device_ctx->nvdev;
1389
1390         netdev_info(ndev, "VF up: %s\n", vf_netdev->name);
1391
1392         /*
1393          * Open the device before switching data path.
1394          */
1395         rndis_filter_open(netvsc_dev);
1396
1397         /*
1398          * notify the host to switch the data path.
1399          */
1400         netvsc_switch_datapath(ndev, true);
1401         netdev_info(ndev, "Data path switched to VF: %s\n", vf_netdev->name);
1402
1403         netif_carrier_off(ndev);
1404
1405         /* Now notify peers through VF device. */
1406         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, vf_netdev);
1407
1408         return NOTIFY_OK;
1409 }
1410
1411 static int netvsc_vf_down(struct net_device *vf_netdev)
1412 {
1413         struct net_device *ndev;
1414         struct netvsc_device *netvsc_dev;
1415         struct net_device_context *net_device_ctx;
1416
1417         ndev = get_netvsc_byref(vf_netdev);
1418         if (!ndev)
1419                 return NOTIFY_DONE;
1420
1421         net_device_ctx = netdev_priv(ndev);
1422         netvsc_dev = net_device_ctx->nvdev;
1423
1424         netdev_info(ndev, "VF down: %s\n", vf_netdev->name);
1425         netvsc_switch_datapath(ndev, false);
1426         netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
1427         rndis_filter_close(netvsc_dev);
1428         netif_carrier_on(ndev);
1429
1430         /* Now notify peers through netvsc device. */
1431         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, ndev);
1432
1433         return NOTIFY_OK;
1434 }
1435
1436 static int netvsc_unregister_vf(struct net_device *vf_netdev)
1437 {
1438         struct net_device *ndev;
1439         struct net_device_context *net_device_ctx;
1440
1441         ndev = get_netvsc_byref(vf_netdev);
1442         if (!ndev)
1443                 return NOTIFY_DONE;
1444
1445         net_device_ctx = netdev_priv(ndev);
1446
1447         netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
1448
1449         RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
1450         dev_put(vf_netdev);
1451         module_put(THIS_MODULE);
1452         return NOTIFY_OK;
1453 }
1454
1455 static int netvsc_probe(struct hv_device *dev,
1456                         const struct hv_vmbus_device_id *dev_id)
1457 {
1458         struct net_device *net = NULL;
1459         struct net_device_context *net_device_ctx;
1460         struct netvsc_device_info device_info;
1461         struct netvsc_device *nvdev;
1462         int ret;
1463
1464         net = alloc_etherdev_mq(sizeof(struct net_device_context),
1465                                 VRSS_CHANNEL_MAX);
1466         if (!net)
1467                 return -ENOMEM;
1468
1469         netif_carrier_off(net);
1470
1471         netvsc_init_settings(net);
1472
1473         net_device_ctx = netdev_priv(net);
1474         net_device_ctx->device_ctx = dev;
1475         net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1476         if (netif_msg_probe(net_device_ctx))
1477                 netdev_dbg(net, "netvsc msg_enable: %d\n",
1478                            net_device_ctx->msg_enable);
1479
1480         hv_set_drvdata(dev, net);
1481
1482         net_device_ctx->start_remove = false;
1483
1484         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1485         INIT_WORK(&net_device_ctx->work, do_set_multicast);
1486
1487         spin_lock_init(&net_device_ctx->lock);
1488         INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1489
1490         net->netdev_ops = &device_ops;
1491         net->ethtool_ops = &ethtool_ops;
1492         SET_NETDEV_DEV(net, &dev->device);
1493
1494         /* We always need headroom for rndis header */
1495         net->needed_headroom = RNDIS_AND_PPI_SIZE;
1496
1497         /* Notify the netvsc driver of the new device */
1498         memset(&device_info, 0, sizeof(device_info));
1499         device_info.ring_size = ring_size;
1500         device_info.max_num_vrss_chns = min_t(u32, VRSS_CHANNEL_DEFAULT,
1501                                               num_online_cpus());
1502         ret = rndis_filter_device_add(dev, &device_info);
1503         if (ret != 0) {
1504                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1505                 free_netdev(net);
1506                 hv_set_drvdata(dev, NULL);
1507                 return ret;
1508         }
1509         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1510
1511         /* hw_features computed in rndis_filter_device_add */
1512         net->features = net->hw_features |
1513                 NETIF_F_HIGHDMA | NETIF_F_SG |
1514                 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
1515         net->vlan_features = net->features;
1516
1517         nvdev = net_device_ctx->nvdev;
1518         netif_set_real_num_tx_queues(net, nvdev->num_chn);
1519         netif_set_real_num_rx_queues(net, nvdev->num_chn);
1520
1521         /* MTU range: 68 - 1500 or 65521 */
1522         net->min_mtu = NETVSC_MTU_MIN;
1523         if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
1524                 net->max_mtu = NETVSC_MTU - ETH_HLEN;
1525         else
1526                 net->max_mtu = ETH_DATA_LEN;
1527
1528         ret = register_netdev(net);
1529         if (ret != 0) {
1530                 pr_err("Unable to register netdev.\n");
1531                 rndis_filter_device_remove(dev, nvdev);
1532                 free_netdev(net);
1533         }
1534
1535         return ret;
1536 }
1537
1538 static int netvsc_remove(struct hv_device *dev)
1539 {
1540         struct net_device *net;
1541         struct net_device_context *ndev_ctx;
1542
1543         net = hv_get_drvdata(dev);
1544
1545         if (net == NULL) {
1546                 dev_err(&dev->device, "No net device to remove\n");
1547                 return 0;
1548         }
1549
1550         ndev_ctx = netdev_priv(net);
1551
1552         /* Avoid racing with netvsc_change_mtu()/netvsc_set_channels()
1553          * removing the device.
1554          */
1555         rtnl_lock();
1556         ndev_ctx->start_remove = true;
1557         rtnl_unlock();
1558
1559         cancel_delayed_work_sync(&ndev_ctx->dwork);
1560         cancel_work_sync(&ndev_ctx->work);
1561
1562         /* Stop outbound asap */
1563         netif_tx_disable(net);
1564
1565         unregister_netdev(net);
1566
1567         /*
1568          * Call to the vsc driver to let it know that the device is being
1569          * removed
1570          */
1571         rndis_filter_device_remove(dev, ndev_ctx->nvdev);
1572
1573         hv_set_drvdata(dev, NULL);
1574
1575         free_netdev(net);
1576         return 0;
1577 }
1578
1579 static const struct hv_vmbus_device_id id_table[] = {
1580         /* Network guid */
1581         { HV_NIC_GUID, },
1582         { },
1583 };
1584
1585 MODULE_DEVICE_TABLE(vmbus, id_table);
1586
1587 /* The one and only one */
1588 static struct  hv_driver netvsc_drv = {
1589         .name = KBUILD_MODNAME,
1590         .id_table = id_table,
1591         .probe = netvsc_probe,
1592         .remove = netvsc_remove,
1593 };
1594
1595 /*
1596  * On Hyper-V, every VF interface is matched with a corresponding
1597  * synthetic interface. The synthetic interface is presented first
1598  * to the guest. When the corresponding VF instance is registered,
1599  * we will take care of switching the data path.
1600  */
1601 static int netvsc_netdev_event(struct notifier_block *this,
1602                                unsigned long event, void *ptr)
1603 {
1604         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
1605
1606         /* Skip our own events */
1607         if (event_dev->netdev_ops == &device_ops)
1608                 return NOTIFY_DONE;
1609
1610         /* Avoid non-Ethernet type devices */
1611         if (event_dev->type != ARPHRD_ETHER)
1612                 return NOTIFY_DONE;
1613
1614         /* Avoid Vlan dev with same MAC registering as VF */
1615         if (is_vlan_dev(event_dev))
1616                 return NOTIFY_DONE;
1617
1618         /* Avoid Bonding master dev with same MAC registering as VF */
1619         if ((event_dev->priv_flags & IFF_BONDING) &&
1620             (event_dev->flags & IFF_MASTER))
1621                 return NOTIFY_DONE;
1622
1623         switch (event) {
1624         case NETDEV_REGISTER:
1625                 return netvsc_register_vf(event_dev);
1626         case NETDEV_UNREGISTER:
1627                 return netvsc_unregister_vf(event_dev);
1628         case NETDEV_UP:
1629                 return netvsc_vf_up(event_dev);
1630         case NETDEV_DOWN:
1631                 return netvsc_vf_down(event_dev);
1632         default:
1633                 return NOTIFY_DONE;
1634         }
1635 }
1636
1637 static struct notifier_block netvsc_netdev_notifier = {
1638         .notifier_call = netvsc_netdev_event,
1639 };
1640
1641 static void __exit netvsc_drv_exit(void)
1642 {
1643         unregister_netdevice_notifier(&netvsc_netdev_notifier);
1644         vmbus_driver_unregister(&netvsc_drv);
1645 }
1646
1647 static int __init netvsc_drv_init(void)
1648 {
1649         int ret;
1650
1651         if (ring_size < RING_SIZE_MIN) {
1652                 ring_size = RING_SIZE_MIN;
1653                 pr_info("Increased ring_size to %d (min allowed)\n",
1654                         ring_size);
1655         }
1656         ret = vmbus_driver_register(&netvsc_drv);
1657
1658         if (ret)
1659                 return ret;
1660
1661         register_netdevice_notifier(&netvsc_netdev_notifier);
1662         return 0;
1663 }
1664
1665 MODULE_LICENSE("GPL");
1666 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1667
1668 module_init(netvsc_drv_init);
1669 module_exit(netvsc_drv_exit);