drivers/net/hyperv/netvsc_drv.c

   1 /*
   2  * Copyright (c) 2009, Microsoft Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Authors:
  17  *   Haiyang Zhang <haiyangz@microsoft.com>
  18  *   Hank Janssen  <hjanssen@microsoft.com>
  19  */
  20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22 #include <linux/init.h>
  23 #include <linux/atomic.h>
  24 #include <linux/module.h>
  25 #include <linux/highmem.h>
  26 #include <linux/device.h>
  27 #include <linux/io.h>
  28 #include <linux/delay.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/inetdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/pci.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/if_vlan.h>
  35 #include <linux/in.h>
  36 #include <linux/slab.h>
  37 #include <linux/rtnetlink.h>
  38 #include <linux/netpoll.h>
  39
  40 #include <net/arp.h>
  41 #include <net/route.h>
  42 #include <net/sock.h>
  43 #include <net/pkt_sched.h>
  44 #include <net/checksum.h>
  45 #include <net/ip6_checksum.h>
  46
  47 #include "hyperv_net.h"
  48
  49 #define RING_SIZE_MIN   64
  50 #define RETRY_US_LO     5000
  51 #define RETRY_US_HI     10000
  52 #define RETRY_MAX       2000    /* >10 sec */
  53
  54 #define LINKCHANGE_INT (2 * HZ)
  55 #define VF_TAKEOVER_INT (HZ / 10)
  56
  57 static int ring_size = 128;
  58 module_param(ring_size, int, S_IRUGO);
  59 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
  60
  61 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
  62                                 NETIF_MSG_LINK | NETIF_MSG_IFUP |
  63                                 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
  64                                 NETIF_MSG_TX_ERR;
  65
  66 static int debug = -1;
  67 module_param(debug, int, S_IRUGO);
  68 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  69
  70 static LIST_HEAD(netvsc_dev_list);
  71
  72 static void netvsc_change_rx_flags(struct net_device *net, int change)
  73 {
  74         struct net_device_context *ndev_ctx = netdev_priv(net);
  75         struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
  76         int inc;
  77
  78         if (!vf_netdev)
  79                 return;
  80
  81         if (change & IFF_PROMISC) {
  82                 inc = (net->flags & IFF_PROMISC) ? 1 : -1;
  83                 dev_set_promiscuity(vf_netdev, inc);
  84         }
  85
  86         if (change & IFF_ALLMULTI) {
  87                 inc = (net->flags & IFF_ALLMULTI) ? 1 : -1;
  88                 dev_set_allmulti(vf_netdev, inc);
  89         }
  90 }
  91
  92 static void netvsc_set_rx_mode(struct net_device *net)
  93 {
  94         struct net_device_context *ndev_ctx = netdev_priv(net);
  95         struct net_device *vf_netdev;
  96         struct netvsc_device *nvdev;
  97
  98         rcu_read_lock();
  99         vf_netdev = rcu_dereference(ndev_ctx->vf_netdev);
 100         if (vf_netdev) {
 101                 dev_uc_sync(vf_netdev, net);
 102                 dev_mc_sync(vf_netdev, net);
 103         }
 104
 105         nvdev = rcu_dereference(ndev_ctx->nvdev);
 106         if (nvdev)
 107                 rndis_filter_update(nvdev);
 108         rcu_read_unlock();
 109 }
 110
 111 static void netvsc_tx_enable(struct netvsc_device *nvscdev,
 112                              struct net_device *ndev)
 113 {
 114         nvscdev->tx_disable = false;
 115         virt_wmb(); /* ensure queue wake up mechanism is on */
 116
 117         netif_tx_wake_all_queues(ndev);
 118 }
 119
 120 static int netvsc_open(struct net_device *net)
 121 {
 122         struct net_device_context *ndev_ctx = netdev_priv(net);
 123         struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
 124         struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);
 125         struct rndis_device *rdev;
 126         int ret = 0;
 127
 128         netif_carrier_off(net);
 129
 130         /* Open up the device */
 131         ret = rndis_filter_open(nvdev);
 132         if (ret != 0) {
 133                 netdev_err(net, "unable to open device (ret %d).\n", ret);
 134                 return ret;
 135         }
 136
 137         rdev = nvdev->extension;
 138         if (!rdev->link_state) {
 139                 netif_carrier_on(net);
 140                 netvsc_tx_enable(nvdev, net);
 141         }
 142
 143         if (vf_netdev) {
 144                 /* Setting synthetic device up transparently sets
 145                  * slave as up. If open fails, then slave will be
 146                  * still be offline (and not used).
 147                  */
 148                 ret = dev_open(vf_netdev);
 149                 if (ret)
 150                         netdev_warn(net,
 151                                     "unable to open slave: %s: %d\n",
 152                                     vf_netdev->name, ret);
 153         }
 154         return 0;
 155 }
 156
 157 static int netvsc_wait_until_empty(struct netvsc_device *nvdev)
 158 {
 159         unsigned int retry = 0;
 160         int i;
 161
 162         /* Ensure pending bytes in ring are read */
 163         for (;;) {
 164                 u32 aread = 0;
 165
 166                 for (i = 0; i < nvdev->num_chn; i++) {
 167                         struct vmbus_channel *chn
 168                                 = nvdev->chan_table[i].channel;
 169
 170                         if (!chn)
 171                                 continue;
 172
 173                         /* make sure receive not running now */
 174                         napi_synchronize(&nvdev->chan_table[i].napi);
 175
 176                         aread = hv_get_bytes_to_read(&chn->inbound);
 177                         if (aread)
 178                                 break;
 179
 180                         aread = hv_get_bytes_to_read(&chn->outbound);
 181                         if (aread)
 182                                 break;
 183                 }
 184
 185                 if (aread == 0)
 186                         return 0;
 187
 188                 if (++retry > RETRY_MAX)
 189                         return -ETIMEDOUT;
 190
 191                 usleep_range(RETRY_US_LO, RETRY_US_HI);
 192         }
 193 }
 194
 195 static void netvsc_tx_disable(struct netvsc_device *nvscdev,
 196                               struct net_device *ndev)
 197 {
 198         if (nvscdev) {
 199                 nvscdev->tx_disable = true;
 200                 virt_wmb(); /* ensure txq will not wake up after stop */
 201         }
 202
 203         netif_tx_disable(ndev);
 204 }
 205
 206 static int netvsc_close(struct net_device *net)
 207 {
 208         struct net_device_context *net_device_ctx = netdev_priv(net);
 209         struct net_device *vf_netdev
 210                 = rtnl_dereference(net_device_ctx->vf_netdev);
 211         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 212         int ret;
 213
 214         netvsc_tx_disable(nvdev, net);
 215
 216         /* No need to close rndis filter if it is removed already */
 217         if (!nvdev)
 218                 return 0;
 219
 220         ret = rndis_filter_close(nvdev);
 221         if (ret != 0) {
 222                 netdev_err(net, "unable to close device (ret %d).\n", ret);
 223                 return ret;
 224         }
 225
 226         ret = netvsc_wait_until_empty(nvdev);
 227         if (ret)
 228                 netdev_err(net, "Ring buffer not empty after closing rndis\n");
 229
 230         if (vf_netdev)
 231                 dev_close(vf_netdev);
 232
 233         return ret;
 234 }
 235
 236 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
 237                            int pkt_type)
 238 {
 239         struct rndis_packet *rndis_pkt;
 240         struct rndis_per_packet_info *ppi;
 241
 242         rndis_pkt = &msg->msg.pkt;
 243         rndis_pkt->data_offset += ppi_size;
 244
 245         ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
 246                 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
 247
 248         ppi->size = ppi_size;
 249         ppi->type = pkt_type;
 250         ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 251
 252         rndis_pkt->per_pkt_info_len += ppi_size;
 253
 254         return ppi;
 255 }
 256
 257 /* Azure hosts don't support non-TCP port numbers in hashing for fragmented
 258  * packets. We can use ethtool to change UDP hash level when necessary.
 259  */
 260 static inline u32 netvsc_get_hash(
 261         struct sk_buff *skb,
 262         const struct net_device_context *ndc)
 263 {
 264         struct flow_keys flow;
 265         u32 hash;
 266         static u32 hashrnd __read_mostly;
 267
 268         net_get_random_once(&hashrnd, sizeof(hashrnd));
 269
 270         if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
 271                 return 0;
 272
 273         if (flow.basic.ip_proto == IPPROTO_TCP ||
 274             (flow.basic.ip_proto == IPPROTO_UDP &&
 275              ((flow.basic.n_proto == htons(ETH_P_IP) && ndc->udp4_l4_hash) ||
 276               (flow.basic.n_proto == htons(ETH_P_IPV6) &&
 277                ndc->udp6_l4_hash)))) {
 278                 return skb_get_hash(skb);
 279         } else {
 280                 if (flow.basic.n_proto == htons(ETH_P_IP))
 281                         hash = jhash2((u32 *)&flow.addrs.v4addrs, 2, hashrnd);
 282                 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
 283                         hash = jhash2((u32 *)&flow.addrs.v6addrs, 8, hashrnd);
 284                 else
 285                         return 0;
 286
 287                 __skb_set_sw_hash(skb, hash, false);
 288         }
 289
 290         return hash;
 291 }
 292
 293 static inline int netvsc_get_tx_queue(struct net_device *ndev,
 294                                       struct sk_buff *skb, int old_idx)
 295 {
 296         const struct net_device_context *ndc = netdev_priv(ndev);
 297         struct sock *sk = skb->sk;
 298         int q_idx;
 299
 300         q_idx = ndc->tx_table[netvsc_get_hash(skb, ndc) &
 301                               (VRSS_SEND_TAB_SIZE - 1)];
 302
 303         /* If queue index changed record the new value */
 304         if (q_idx != old_idx &&
 305             sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
 306                 sk_tx_queue_set(sk, q_idx);
 307
 308         return q_idx;
 309 }
 310
 311 /*
 312  * Select queue for transmit.
 313  *
 314  * If a valid queue has already been assigned, then use that.
 315  * Otherwise compute tx queue based on hash and the send table.
 316  *
 317  * This is basically similar to default (__netdev_pick_tx) with the added step
 318  * of using the host send_table when no other queue has been assigned.
 319  *
 320  * TODO support XPS - but get_xps_queue not exported
 321  */
 322 static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)
 323 {
 324         int q_idx = sk_tx_queue_get(skb->sk);
 325
 326         if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {
 327                 /* If forwarding a packet, we use the recorded queue when
 328                  * available for better cache locality.
 329                  */
 330                 if (skb_rx_queue_recorded(skb))
 331                         q_idx = skb_get_rx_queue(skb);
 332                 else
 333                         q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);
 334         }
 335
 336         return q_idx;
 337 }
 338
 339 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
 340                                void *accel_priv,
 341                                select_queue_fallback_t fallback)
 342 {
 343         struct net_device_context *ndc = netdev_priv(ndev);
 344         struct net_device *vf_netdev;
 345         u16 txq;
 346
 347         rcu_read_lock();
 348         vf_netdev = rcu_dereference(ndc->vf_netdev);
 349         if (vf_netdev) {
 350                 const struct net_device_ops *vf_ops = vf_netdev->netdev_ops;
 351
 352                 if (vf_ops->ndo_select_queue)
 353                         txq = vf_ops->ndo_select_queue(vf_netdev, skb,
 354                                                        accel_priv, fallback);
 355                 else
 356                         txq = fallback(vf_netdev, skb);
 357
 358                 /* Record the queue selected by VF so that it can be
 359                  * used for common case where VF has more queues than
 360                  * the synthetic device.
 361                  */
 362                 qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq;
 363         } else {
 364                 txq = netvsc_pick_tx(ndev, skb);
 365         }
 366         rcu_read_unlock();
 367
 368         while (txq >= ndev->real_num_tx_queues)
 369                 txq -= ndev->real_num_tx_queues;
 370
 371         return txq;
 372 }
 373
 374 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
 375                        struct hv_page_buffer *pb)
 376 {
 377         int j = 0;
 378
 379         /* Deal with compund pages by ignoring unused part
 380          * of the page.
 381          */
 382         page += (offset >> PAGE_SHIFT);
 383         offset &= ~PAGE_MASK;
 384
 385         while (len > 0) {
 386                 unsigned long bytes;
 387
 388                 bytes = PAGE_SIZE - offset;
 389                 if (bytes > len)
 390                         bytes = len;
 391                 pb[j].pfn = page_to_pfn(page);
 392                 pb[j].offset = offset;
 393                 pb[j].len = bytes;
 394
 395                 offset += bytes;
 396                 len -= bytes;
 397
 398                 if (offset == PAGE_SIZE && len) {
 399                         page++;
 400                         offset = 0;
 401                         j++;
 402                 }
 403         }
 404
 405         return j + 1;
 406 }
 407
 408 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
 409                            struct hv_netvsc_packet *packet,
 410                            struct hv_page_buffer *pb)
 411 {
 412         u32 slots_used = 0;
 413         char *data = skb->data;
 414         int frags = skb_shinfo(skb)->nr_frags;
 415         int i;
 416
 417         /* The packet is laid out thus:
 418          * 1. hdr: RNDIS header and PPI
 419          * 2. skb linear data
 420          * 3. skb fragment data
 421          */
 422         slots_used += fill_pg_buf(virt_to_page(hdr),
 423                                   offset_in_page(hdr),
 424                                   len, &pb[slots_used]);
 425
 426         packet->rmsg_size = len;
 427         packet->rmsg_pgcnt = slots_used;
 428
 429         slots_used += fill_pg_buf(virt_to_page(data),
 430                                 offset_in_page(data),
 431                                 skb_headlen(skb), &pb[slots_used]);
 432
 433         for (i = 0; i < frags; i++) {
 434                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 435
 436                 slots_used += fill_pg_buf(skb_frag_page(frag),
 437                                         frag->page_offset,
 438                                         skb_frag_size(frag), &pb[slots_used]);
 439         }
 440         return slots_used;
 441 }
 442
 443 static int count_skb_frag_slots(struct sk_buff *skb)
 444 {
 445         int i, frags = skb_shinfo(skb)->nr_frags;
 446         int pages = 0;
 447
 448         for (i = 0; i < frags; i++) {
 449                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 450                 unsigned long size = skb_frag_size(frag);
 451                 unsigned long offset = frag->page_offset;
 452
 453                 /* Skip unused frames from start of page */
 454                 offset &= ~PAGE_MASK;
 455                 pages += PFN_UP(offset + size);
 456         }
 457         return pages;
 458 }
 459
 460 static int netvsc_get_slots(struct sk_buff *skb)
 461 {
 462         char *data = skb->data;
 463         unsigned int offset = offset_in_page(data);
 464         unsigned int len = skb_headlen(skb);
 465         int slots;
 466         int frag_slots;
 467
 468         slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
 469         frag_slots = count_skb_frag_slots(skb);
 470         return slots + frag_slots;
 471 }
 472
 473 static u32 net_checksum_info(struct sk_buff *skb)
 474 {
 475         if (skb->protocol == htons(ETH_P_IP)) {
 476                 struct iphdr *ip = ip_hdr(skb);
 477
 478                 if (ip->protocol == IPPROTO_TCP)
 479                         return TRANSPORT_INFO_IPV4_TCP;
 480                 else if (ip->protocol == IPPROTO_UDP)
 481                         return TRANSPORT_INFO_IPV4_UDP;
 482         } else {
 483                 struct ipv6hdr *ip6 = ipv6_hdr(skb);
 484
 485                 if (ip6->nexthdr == IPPROTO_TCP)
 486                         return TRANSPORT_INFO_IPV6_TCP;
 487                 else if (ip6->nexthdr == IPPROTO_UDP)
 488                         return TRANSPORT_INFO_IPV6_UDP;
 489         }
 490
 491         return TRANSPORT_INFO_NOT_IP;
 492 }
 493
 494 /* Send skb on the slave VF device. */
 495 static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
 496                           struct sk_buff *skb)
 497 {
 498         struct net_device_context *ndev_ctx = netdev_priv(net);
 499         unsigned int len = skb->len;
 500         int rc;
 501
 502         skb->dev = vf_netdev;
 503         skb_record_rx_queue(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 504
 505         rc = dev_queue_xmit(skb);
 506         if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {
 507                 struct netvsc_vf_pcpu_stats *pcpu_stats
 508                         = this_cpu_ptr(ndev_ctx->vf_stats);
 509
 510                 u64_stats_update_begin(&pcpu_stats->syncp);
 511                 pcpu_stats->tx_packets++;
 512                 pcpu_stats->tx_bytes += len;
 513                 u64_stats_update_end(&pcpu_stats->syncp);
 514         } else {
 515                 this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);
 516         }
 517
 518         return rc;
 519 }
 520
 521 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 522 {
 523         struct net_device_context *net_device_ctx = netdev_priv(net);
 524         struct hv_netvsc_packet *packet = NULL;
 525         int ret;
 526         unsigned int num_data_pgs;
 527         struct rndis_message *rndis_msg;
 528         struct rndis_packet *rndis_pkt;
 529         struct net_device *vf_netdev;
 530         u32 rndis_msg_size;
 531         struct rndis_per_packet_info *ppi;
 532         u32 hash;
 533         struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
 534
 535         /* If VF is present and up then redirect packets to it.
 536          * Skip the VF if it is marked down or has no carrier.
 537          * If netpoll is in uses, then VF can not be used either.
 538          */
 539         vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
 540         if (vf_netdev && netif_running(vf_netdev) &&
 541             netif_carrier_ok(vf_netdev) && !netpoll_tx_running(net))
 542                 return netvsc_vf_xmit(net, vf_netdev, skb);
 543
 544         /* We will atmost need two pages to describe the rndis
 545          * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
 546          * of pages in a single packet. If skb is scattered around
 547          * more pages we try linearizing it.
 548          */
 549
 550         num_data_pgs = netvsc_get_slots(skb) + 2;
 551
 552         if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
 553                 ++net_device_ctx->eth_stats.tx_scattered;
 554
 555                 if (skb_linearize(skb))
 556                         goto no_memory;
 557
 558                 num_data_pgs = netvsc_get_slots(skb) + 2;
 559                 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
 560                         ++net_device_ctx->eth_stats.tx_too_big;
 561                         goto drop;
 562                 }
 563         }
 564
 565         /*
 566          * Place the rndis header in the skb head room and
 567          * the skb->cb will be used for hv_netvsc_packet
 568          * structure.
 569          */
 570         ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
 571         if (ret)
 572                 goto no_memory;
 573
 574         /* Use the skb control buffer for building up the packet */
 575         BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
 576                         FIELD_SIZEOF(struct sk_buff, cb));
 577         packet = (struct hv_netvsc_packet *)skb->cb;
 578
 579         packet->q_idx = skb_get_queue_mapping(skb);
 580
 581         packet->total_data_buflen = skb->len;
 582         packet->total_bytes = skb->len;
 583         packet->total_packets = 1;
 584
 585         rndis_msg = (struct rndis_message *)skb->head;
 586
 587         memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
 588
 589         /* Add the rndis header */
 590         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 591         rndis_msg->msg_len = packet->total_data_buflen;
 592         rndis_pkt = &rndis_msg->msg.pkt;
 593         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 594         rndis_pkt->data_len = packet->total_data_buflen;
 595         rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 596
 597         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 598
 599         hash = skb_get_hash_raw(skb);
 600         if (hash != 0 && net->real_num_tx_queues > 1) {
 601                 rndis_msg_size += NDIS_HASH_PPI_SIZE;
 602                 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
 603                                     NBL_HASH_VALUE);
 604                 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
 605         }
 606
 607         if (skb_vlan_tag_present(skb)) {
 608                 struct ndis_pkt_8021q_info *vlan;
 609
 610                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 611                 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
 612                                     IEEE_8021Q_INFO);
 613
 614                 vlan = (void *)ppi + ppi->ppi_offset;
 615                 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
 616                 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
 617                                 VLAN_PRIO_SHIFT;
 618         }
 619
 620         if (skb_is_gso(skb)) {
 621                 struct ndis_tcp_lso_info *lso_info;
 622
 623                 rndis_msg_size += NDIS_LSO_PPI_SIZE;
 624                 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
 625                                     TCP_LARGESEND_PKTINFO);
 626
 627                 lso_info = (void *)ppi + ppi->ppi_offset;
 628
 629                 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
 630                 if (skb->protocol == htons(ETH_P_IP)) {
 631                         lso_info->lso_v2_transmit.ip_version =
 632                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
 633                         ip_hdr(skb)->tot_len = 0;
 634                         ip_hdr(skb)->check = 0;
 635                         tcp_hdr(skb)->check =
 636                                 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 637                                                    ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 638                 } else {
 639                         lso_info->lso_v2_transmit.ip_version =
 640                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
 641                         ipv6_hdr(skb)->payload_len = 0;
 642                         tcp_hdr(skb)->check =
 643                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 644                                                  &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 645                 }
 646                 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
 647                 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 648         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 649                 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
 650                         struct ndis_tcp_ip_checksum_info *csum_info;
 651
 652                         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 653                         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 654                                             TCPIP_CHKSUM_PKTINFO);
 655
 656                         csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 657                                                                          ppi->ppi_offset);
 658
 659                         csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
 660
 661                         if (skb->protocol == htons(ETH_P_IP)) {
 662                                 csum_info->transmit.is_ipv4 = 1;
 663
 664                                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 665                                         csum_info->transmit.tcp_checksum = 1;
 666                                 else
 667                                         csum_info->transmit.udp_checksum = 1;
 668                         } else {
 669                                 csum_info->transmit.is_ipv6 = 1;
 670
 671                                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
 672                                         csum_info->transmit.tcp_checksum = 1;
 673                                 else
 674                                         csum_info->transmit.udp_checksum = 1;
 675                         }
 676                 } else {
 677                         /* Can't do offload of this type of checksum */
 678                         if (skb_checksum_help(skb))
 679                                 goto drop;
 680                 }
 681         }
 682
 683         /* Start filling in the page buffers with the rndis hdr */
 684         rndis_msg->msg_len += rndis_msg_size;
 685         packet->total_data_buflen = rndis_msg->msg_len;
 686         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 687                                                skb, packet, pb);
 688
 689         /* timestamp packet in software */
 690         skb_tx_timestamp(skb);
 691
 692         ret = netvsc_send(net, packet, rndis_msg, pb, skb);
 693         if (likely(ret == 0))
 694                 return NETDEV_TX_OK;
 695
 696         if (ret == -EAGAIN) {
 697                 ++net_device_ctx->eth_stats.tx_busy;
 698                 return NETDEV_TX_BUSY;
 699         }
 700
 701         if (ret == -ENOSPC)
 702                 ++net_device_ctx->eth_stats.tx_no_space;
 703
 704 drop:
 705         dev_kfree_skb_any(skb);
 706         net->stats.tx_dropped++;
 707
 708         return NETDEV_TX_OK;
 709
 710 no_memory:
 711         ++net_device_ctx->eth_stats.tx_no_memory;
 712         goto drop;
 713 }
 714
 715 /*
 716  * netvsc_linkstatus_callback - Link up/down notification
 717  */
 718 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 719                                 struct rndis_message *resp)
 720 {
 721         struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
 722         struct net_device *net;
 723         struct net_device_context *ndev_ctx;
 724         struct netvsc_reconfig *event;
 725         unsigned long flags;
 726
 727         net = hv_get_drvdata(device_obj);
 728
 729         if (!net)
 730                 return;
 731
 732         ndev_ctx = netdev_priv(net);
 733
 734         /* Update the physical link speed when changing to another vSwitch */
 735         if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
 736                 u32 speed;
 737
 738                 speed = *(u32 *)((void *)indicate
 739                                  + indicate->status_buf_offset) / 10000;
 740                 ndev_ctx->speed = speed;
 741                 return;
 742         }
 743
 744         /* Handle these link change statuses below */
 745         if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
 746             indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
 747             indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
 748                 return;
 749
 750         if (net->reg_state != NETREG_REGISTERED)
 751                 return;
 752
 753         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 754         if (!event)
 755                 return;
 756         event->event = indicate->status;
 757
 758         spin_lock_irqsave(&ndev_ctx->lock, flags);
 759         list_add_tail(&event->list, &ndev_ctx->reconfig_events);
 760         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
 761
 762         schedule_delayed_work(&ndev_ctx->dwork, 0);
 763 }
 764
 765 static void netvsc_comp_ipcsum(struct sk_buff *skb)
 766 {
 767         struct iphdr *iph = (struct iphdr *)skb->data;
 768
 769         iph->check = 0;
 770         iph->check = ip_fast_csum(iph, iph->ihl);
 771 }
 772
 773 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 774                                              struct napi_struct *napi,
 775                                              const struct ndis_tcp_ip_checksum_info *csum_info,
 776                                              const struct ndis_pkt_8021q_info *vlan,
 777                                              void *data, u32 buflen)
 778 {
 779         struct sk_buff *skb;
 780
 781         skb = napi_alloc_skb(napi, buflen);
 782         if (!skb)
 783                 return skb;
 784
 785         /*
 786          * Copy to skb. This copy is needed here since the memory pointed by
 787          * hv_netvsc_packet cannot be deallocated
 788          */
 789         skb_put_data(skb, data, buflen);
 790
 791         skb->protocol = eth_type_trans(skb, net);
 792
 793         /* skb is already created with CHECKSUM_NONE */
 794         skb_checksum_none_assert(skb);
 795
 796         /* Incoming packets may have IP header checksum verified by the host.
 797          * They may not have IP header checksum computed after coalescing.
 798          * We compute it here if the flags are set, because on Linux, the IP
 799          * checksum is always checked.
 800          */
 801         if (csum_info && csum_info->receive.ip_checksum_value_invalid &&
 802             csum_info->receive.ip_checksum_succeeded &&
 803             skb->protocol == htons(ETH_P_IP))
 804                 netvsc_comp_ipcsum(skb);
 805
 806         /* Do L4 checksum offload if enabled and present. */
 807         if (csum_info && (net->features & NETIF_F_RXCSUM)) {
 808                 if (csum_info->receive.tcp_checksum_succeeded ||
 809                     csum_info->receive.udp_checksum_succeeded)
 810                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 811         }
 812
 813         if (vlan) {
 814                 u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
 815
 816                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 817                                        vlan_tci);
 818         }
 819
 820         return skb;
 821 }
 822
 823 /*
 824  * netvsc_recv_callback -  Callback when we receive a packet from the
 825  * "wire" on the specified device.
 826  */
 827 int netvsc_recv_callback(struct net_device *net,
 828                          struct vmbus_channel *channel,
 829                          void  *data, u32 len,
 830                          const struct ndis_tcp_ip_checksum_info *csum_info,
 831                          const struct ndis_pkt_8021q_info *vlan)
 832 {
 833         struct net_device_context *net_device_ctx = netdev_priv(net);
 834         struct netvsc_device *net_device;
 835         u16 q_idx = channel->offermsg.offer.sub_channel_index;
 836         struct netvsc_channel *nvchan;
 837         struct sk_buff *skb;
 838         struct netvsc_stats *rx_stats;
 839
 840         if (net->reg_state != NETREG_REGISTERED)
 841                 return NVSP_STAT_FAIL;
 842
 843         rcu_read_lock();
 844         net_device = rcu_dereference(net_device_ctx->nvdev);
 845         if (unlikely(!net_device))
 846                 goto drop;
 847
 848         nvchan = &net_device->chan_table[q_idx];
 849
 850         /* Allocate a skb - TODO direct I/O to pages? */
 851         skb = netvsc_alloc_recv_skb(net, &nvchan->napi,
 852                                     csum_info, vlan, data, len);
 853         if (unlikely(!skb)) {
 854 drop:
 855                 ++net->stats.rx_dropped;
 856                 rcu_read_unlock();
 857                 return NVSP_STAT_FAIL;
 858         }
 859
 860         skb_record_rx_queue(skb, q_idx);
 861
 862         /*
 863          * Even if injecting the packet, record the statistics
 864          * on the synthetic device because modifying the VF device
 865          * statistics will not work correctly.
 866          */
 867         rx_stats = &nvchan->rx_stats;
 868         u64_stats_update_begin(&rx_stats->syncp);
 869         rx_stats->packets++;
 870         rx_stats->bytes += len;
 871
 872         if (skb->pkt_type == PACKET_BROADCAST)
 873                 ++rx_stats->broadcast;
 874         else if (skb->pkt_type == PACKET_MULTICAST)
 875                 ++rx_stats->multicast;
 876         u64_stats_update_end(&rx_stats->syncp);
 877
 878         napi_gro_receive(&nvchan->napi, skb);
 879         rcu_read_unlock();
 880
 881         return 0;
 882 }
 883
 884 static void netvsc_get_drvinfo(struct net_device *net,
 885                                struct ethtool_drvinfo *info)
 886 {
 887         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 888         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 889 }
 890
 891 static void netvsc_get_channels(struct net_device *net,
 892                                 struct ethtool_channels *channel)
 893 {
 894         struct net_device_context *net_device_ctx = netdev_priv(net);
 895         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 896
 897         if (nvdev) {
 898                 channel->max_combined   = nvdev->max_chn;
 899                 channel->combined_count = nvdev->num_chn;
 900         }
 901 }
 902
 903 static int netvsc_detach(struct net_device *ndev,
 904                          struct netvsc_device *nvdev)
 905 {
 906         struct net_device_context *ndev_ctx = netdev_priv(ndev);
 907         struct hv_device *hdev = ndev_ctx->device_ctx;
 908         int ret;
 909
 910         /* Don't try continuing to try and setup sub channels */
 911         if (cancel_work_sync(&nvdev->subchan_work))
 912                 nvdev->num_chn = 1;
 913
 914         /* If device was up (receiving) then shutdown */
 915         if (netif_running(ndev)) {
 916                 netvsc_tx_disable(nvdev, ndev);
 917
 918                 ret = rndis_filter_close(nvdev);
 919                 if (ret) {
 920                         netdev_err(ndev,
 921                                    "unable to close device (ret %d).\n", ret);
 922                         return ret;
 923                 }
 924
 925                 ret = netvsc_wait_until_empty(nvdev);
 926                 if (ret) {
 927                         netdev_err(ndev,
 928                                    "Ring buffer not empty after closing rndis\n");
 929                         return ret;
 930                 }
 931         }
 932
 933         netif_device_detach(ndev);
 934
 935         rndis_filter_device_remove(hdev, nvdev);
 936
 937         return 0;
 938 }
 939
 940 static int netvsc_attach(struct net_device *ndev,
 941                          struct netvsc_device_info *dev_info)
 942 {
 943         struct net_device_context *ndev_ctx = netdev_priv(ndev);
 944         struct hv_device *hdev = ndev_ctx->device_ctx;
 945         struct netvsc_device *nvdev;
 946         struct rndis_device *rdev;
 947         int ret;
 948
 949         nvdev = rndis_filter_device_add(hdev, dev_info);
 950         if (IS_ERR(nvdev))
 951                 return PTR_ERR(nvdev);
 952
 953         if (nvdev->num_chn > 1) {
 954                 ret = rndis_set_subchannel(ndev, nvdev);
 955
 956                 /* if unavailable, just proceed with one queue */
 957                 if (ret) {
 958                         nvdev->max_chn = 1;
 959                         nvdev->num_chn = 1;
 960                 }
 961         }
 962
 963         /* In any case device is now ready */
 964         netif_device_attach(ndev);
 965
 966         /* Note: enable and attach happen when sub-channels setup */
 967         netif_carrier_off(ndev);
 968
 969         if (netif_running(ndev)) {
 970                 ret = rndis_filter_open(nvdev);
 971                 if (ret)
 972                         goto err;
 973
 974                 rdev = nvdev->extension;
 975                 if (!rdev->link_state)
 976                         netif_carrier_on(ndev);
 977         }
 978
 979         return 0;
 980
 981 err:
 982         netif_device_detach(ndev);
 983
 984         rndis_filter_device_remove(hdev, nvdev);
 985
 986         return ret;
 987 }
 988
 989 static int netvsc_set_channels(struct net_device *net,
 990                                struct ethtool_channels *channels)
 991 {
 992         struct net_device_context *net_device_ctx = netdev_priv(net);
 993         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 994         unsigned int orig, count = channels->combined_count;
 995         struct netvsc_device_info device_info;
 996         int ret;
 997
 998         /* We do not support separate count for rx, tx, or other */
 999         if (count == 0 ||
1000             channels->rx_count || channels->tx_count || channels->other_count)
1001                 return -EINVAL;
1002
1003         if (!nvdev || nvdev->destroy)
1004                 return -ENODEV;
1005
1006         if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1007                 return -EINVAL;
1008
1009         if (count > nvdev->max_chn)
1010                 return -EINVAL;
1011
1012         orig = nvdev->num_chn;
1013
1014         memset(&device_info, 0, sizeof(device_info));
1015         device_info.num_chn = count;
1016         device_info.ring_size = ring_size;
1017         device_info.send_sections = nvdev->send_section_cnt;
1018         device_info.send_section_size = nvdev->send_section_size;
1019         device_info.recv_sections = nvdev->recv_section_cnt;
1020         device_info.recv_section_size = nvdev->recv_section_size;
1021
1022         ret = netvsc_detach(net, nvdev);
1023         if (ret)
1024                 return ret;
1025
1026         ret = netvsc_attach(net, &device_info);
1027         if (ret) {
1028                 device_info.num_chn = orig;
1029                 if (netvsc_attach(net, &device_info))
1030                         netdev_err(net, "restoring channel setting failed\n");
1031         }
1032
1033         return ret;
1034 }
1035
1036 static bool
1037 netvsc_validate_ethtool_ss_cmd(const struct ethtool_link_ksettings *cmd)
1038 {
1039         struct ethtool_link_ksettings diff1 = *cmd;
1040         struct ethtool_link_ksettings diff2 = {};
1041
1042         diff1.base.speed = 0;
1043         diff1.base.duplex = 0;
1044         /* advertising and cmd are usually set */
1045         ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
1046         diff1.base.cmd = 0;
1047         /* We set port to PORT_OTHER */
1048         diff2.base.port = PORT_OTHER;
1049
1050         return !memcmp(&diff1, &diff2, sizeof(diff1));
1051 }
1052
1053 static void netvsc_init_settings(struct net_device *dev)
1054 {
1055         struct net_device_context *ndc = netdev_priv(dev);
1056
1057         ndc->udp4_l4_hash = true;
1058         ndc->udp6_l4_hash = true;
1059
1060         ndc->speed = SPEED_UNKNOWN;
1061         ndc->duplex = DUPLEX_FULL;
1062 }
1063
1064 static int netvsc_get_link_ksettings(struct net_device *dev,
1065                                      struct ethtool_link_ksettings *cmd)
1066 {
1067         struct net_device_context *ndc = netdev_priv(dev);
1068
1069         cmd->base.speed = ndc->speed;
1070         cmd->base.duplex = ndc->duplex;
1071         cmd->base.port = PORT_OTHER;
1072
1073         return 0;
1074 }
1075
1076 static int netvsc_set_link_ksettings(struct net_device *dev,
1077                                      const struct ethtool_link_ksettings *cmd)
1078 {
1079         struct net_device_context *ndc = netdev_priv(dev);
1080         u32 speed;
1081
1082         speed = cmd->base.speed;
1083         if (!ethtool_validate_speed(speed) ||
1084             !ethtool_validate_duplex(cmd->base.duplex) ||
1085             !netvsc_validate_ethtool_ss_cmd(cmd))
1086                 return -EINVAL;
1087
1088         ndc->speed = speed;
1089         ndc->duplex = cmd->base.duplex;
1090
1091         return 0;
1092 }
1093
1094 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
1095 {
1096         struct net_device_context *ndevctx = netdev_priv(ndev);
1097         struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
1098         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1099         int orig_mtu = ndev->mtu;
1100         struct netvsc_device_info device_info;
1101         int ret = 0;
1102
1103         if (!nvdev || nvdev->destroy)
1104                 return -ENODEV;
1105
1106         /* Change MTU of underlying VF netdev first. */
1107         if (vf_netdev) {
1108                 ret = dev_set_mtu(vf_netdev, mtu);
1109                 if (ret)
1110                         return ret;
1111         }
1112
1113         memset(&device_info, 0, sizeof(device_info));
1114         device_info.ring_size = ring_size;
1115         device_info.num_chn = nvdev->num_chn;
1116         device_info.send_sections = nvdev->send_section_cnt;
1117         device_info.send_section_size = nvdev->send_section_size;
1118         device_info.recv_sections = nvdev->recv_section_cnt;
1119         device_info.recv_section_size = nvdev->recv_section_size;
1120
1121         ret = netvsc_detach(ndev, nvdev);
1122         if (ret)
1123                 goto rollback_vf;
1124
1125         ndev->mtu = mtu;
1126
1127         ret = netvsc_attach(ndev, &device_info);
1128         if (ret)
1129                 goto rollback;
1130
1131         return 0;
1132
1133 rollback:
1134         /* Attempt rollback to original MTU */
1135         ndev->mtu = orig_mtu;
1136
1137         if (netvsc_attach(ndev, &device_info))
1138                 netdev_err(ndev, "restoring mtu failed\n");
1139 rollback_vf:
1140         if (vf_netdev)
1141                 dev_set_mtu(vf_netdev, orig_mtu);
1142
1143         return ret;
1144 }
1145
1146 static void netvsc_get_vf_stats(struct net_device *net,
1147                                 struct netvsc_vf_pcpu_stats *tot)
1148 {
1149         struct net_device_context *ndev_ctx = netdev_priv(net);
1150         int i;
1151
1152         memset(tot, 0, sizeof(*tot));
1153
1154         for_each_possible_cpu(i) {
1155                 const struct netvsc_vf_pcpu_stats *stats
1156                         = per_cpu_ptr(ndev_ctx->vf_stats, i);
1157                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1158                 unsigned int start;
1159
1160                 do {
1161                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1162                         rx_packets = stats->rx_packets;
1163                         tx_packets = stats->tx_packets;
1164                         rx_bytes = stats->rx_bytes;
1165                         tx_bytes = stats->tx_bytes;
1166                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1167
1168                 tot->rx_packets += rx_packets;
1169                 tot->tx_packets += tx_packets;
1170                 tot->rx_bytes   += rx_bytes;
1171                 tot->tx_bytes   += tx_bytes;
1172                 tot->tx_dropped += stats->tx_dropped;
1173         }
1174 }
1175
1176 static void netvsc_get_stats64(struct net_device *net,
1177                                struct rtnl_link_stats64 *t)
1178 {
1179         struct net_device_context *ndev_ctx = netdev_priv(net);
1180         struct netvsc_device *nvdev;
1181         struct netvsc_vf_pcpu_stats vf_tot;
1182         int i;
1183
1184         rcu_read_lock();
1185
1186         nvdev = rcu_dereference(ndev_ctx->nvdev);
1187         if (!nvdev)
1188                 goto out;
1189
1190         netdev_stats_to_stats64(t, &net->stats);
1191
1192         netvsc_get_vf_stats(net, &vf_tot);
1193         t->rx_packets += vf_tot.rx_packets;
1194         t->tx_packets += vf_tot.tx_packets;
1195         t->rx_bytes   += vf_tot.rx_bytes;
1196         t->tx_bytes   += vf_tot.tx_bytes;
1197         t->tx_dropped += vf_tot.tx_dropped;
1198
1199         for (i = 0; i < nvdev->num_chn; i++) {
1200                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1201                 const struct netvsc_stats *stats;
1202                 u64 packets, bytes, multicast;
1203                 unsigned int start;
1204
1205                 stats = &nvchan->tx_stats;
1206                 do {
1207                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1208                         packets = stats->packets;
1209                         bytes = stats->bytes;
1210                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1211
1212                 t->tx_bytes     += bytes;
1213                 t->tx_packets   += packets;
1214
1215                 stats = &nvchan->rx_stats;
1216                 do {
1217                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1218                         packets = stats->packets;
1219                         bytes = stats->bytes;
1220                         multicast = stats->multicast + stats->broadcast;
1221                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1222
1223                 t->rx_bytes     += bytes;
1224                 t->rx_packets   += packets;
1225                 t->multicast    += multicast;
1226         }
1227 out:
1228         rcu_read_unlock();
1229 }
1230
1231 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
1232 {
1233         struct net_device_context *ndc = netdev_priv(ndev);
1234         struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
1235         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1236         struct sockaddr *addr = p;
1237         int err;
1238
1239         err = eth_prepare_mac_addr_change(ndev, p);
1240         if (err)
1241                 return err;
1242
1243         if (!nvdev)
1244                 return -ENODEV;
1245
1246         if (vf_netdev) {
1247                 err = dev_set_mac_address(vf_netdev, addr);
1248                 if (err)
1249                         return err;
1250         }
1251
1252         err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
1253         if (!err) {
1254                 eth_commit_mac_addr_change(ndev, p);
1255         } else if (vf_netdev) {
1256                 /* rollback change on VF */
1257                 memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
1258                 dev_set_mac_address(vf_netdev, addr);
1259         }
1260
1261         return err;
1262 }
1263
1264 static const struct {
1265         char name[ETH_GSTRING_LEN];
1266         u16 offset;
1267 } netvsc_stats[] = {
1268         { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
1269         { "tx_no_memory",  offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
1270         { "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },
1271         { "tx_too_big",   offsetof(struct netvsc_ethtool_stats, tx_too_big) },
1272         { "tx_busy",      offsetof(struct netvsc_ethtool_stats, tx_busy) },
1273         { "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },
1274         { "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },
1275 }, vf_stats[] = {
1276         { "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },
1277         { "vf_rx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },
1278         { "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },
1279         { "vf_tx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },
1280         { "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },
1281 };
1282
1283 #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats)
1284 #define NETVSC_VF_STATS_LEN     ARRAY_SIZE(vf_stats)
1285
1286 /* 4 statistics per queue (rx/tx packets/bytes) */
1287 #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4)
1288
1289 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
1290 {
1291         struct net_device_context *ndc = netdev_priv(dev);
1292         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1293
1294         if (!nvdev)
1295                 return -ENODEV;
1296
1297         switch (string_set) {
1298         case ETH_SS_STATS:
1299                 return NETVSC_GLOBAL_STATS_LEN
1300                         + NETVSC_VF_STATS_LEN
1301                         + NETVSC_QUEUE_STATS_LEN(nvdev);
1302         default:
1303                 return -EINVAL;
1304         }
1305 }
1306
1307 static void netvsc_get_ethtool_stats(struct net_device *dev,
1308                                      struct ethtool_stats *stats, u64 *data)
1309 {
1310         struct net_device_context *ndc = netdev_priv(dev);
1311         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1312         const void *nds = &ndc->eth_stats;
1313         const struct netvsc_stats *qstats;
1314         struct netvsc_vf_pcpu_stats sum;
1315         unsigned int start;
1316         u64 packets, bytes;
1317         int i, j;
1318
1319         if (!nvdev)
1320                 return;
1321
1322         for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
1323                 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1324
1325         netvsc_get_vf_stats(dev, &sum);
1326         for (j = 0; j < NETVSC_VF_STATS_LEN; j++)
1327                 data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);
1328
1329         for (j = 0; j < nvdev->num_chn; j++) {
1330                 qstats = &nvdev->chan_table[j].tx_stats;
1331
1332                 do {
1333                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1334                         packets = qstats->packets;
1335                         bytes = qstats->bytes;
1336                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1337                 data[i++] = packets;
1338                 data[i++] = bytes;
1339
1340                 qstats = &nvdev->chan_table[j].rx_stats;
1341                 do {
1342                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1343                         packets = qstats->packets;
1344                         bytes = qstats->bytes;
1345                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1346                 data[i++] = packets;
1347                 data[i++] = bytes;
1348         }
1349 }
1350
1351 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1352 {
1353         struct net_device_context *ndc = netdev_priv(dev);
1354         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1355         u8 *p = data;
1356         int i;
1357
1358         if (!nvdev)
1359                 return;
1360
1361         switch (stringset) {
1362         case ETH_SS_STATS:
1363                 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) {
1364                         memcpy(p, netvsc_stats[i].name, ETH_GSTRING_LEN);
1365                         p += ETH_GSTRING_LEN;
1366                 }
1367
1368                 for (i = 0; i < ARRAY_SIZE(vf_stats); i++) {
1369                         memcpy(p, vf_stats[i].name, ETH_GSTRING_LEN);
1370                         p += ETH_GSTRING_LEN;
1371                 }
1372
1373                 for (i = 0; i < nvdev->num_chn; i++) {
1374                         sprintf(p, "tx_queue_%u_packets", i);
1375                         p += ETH_GSTRING_LEN;
1376                         sprintf(p, "tx_queue_%u_bytes", i);
1377                         p += ETH_GSTRING_LEN;
1378                         sprintf(p, "rx_queue_%u_packets", i);
1379                         p += ETH_GSTRING_LEN;
1380                         sprintf(p, "rx_queue_%u_bytes", i);
1381                         p += ETH_GSTRING_LEN;
1382                 }
1383
1384                 break;
1385         }
1386 }
1387
1388 static int
1389 netvsc_get_rss_hash_opts(struct net_device_context *ndc,
1390                          struct ethtool_rxnfc *info)
1391 {
1392         info->data = RXH_IP_SRC | RXH_IP_DST;
1393
1394         switch (info->flow_type) {
1395         case TCP_V4_FLOW:
1396         case TCP_V6_FLOW:
1397                 info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
1398                 break;
1399
1400         case UDP_V4_FLOW:
1401                 if (ndc->udp4_l4_hash)
1402                         info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
1403
1404                 break;
1405
1406         case UDP_V6_FLOW:
1407                 if (ndc->udp6_l4_hash)
1408                         info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
1409
1410                 break;
1411
1412         case IPV4_FLOW:
1413         case IPV6_FLOW:
1414                 break;
1415         default:
1416                 info->data = 0;
1417                 break;
1418         }
1419
1420         return 0;
1421 }
1422
1423 static int
1424 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1425                  u32 *rules)
1426 {
1427         struct net_device_context *ndc = netdev_priv(dev);
1428         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1429
1430         if (!nvdev)
1431                 return -ENODEV;
1432
1433         switch (info->cmd) {
1434         case ETHTOOL_GRXRINGS:
1435                 info->data = nvdev->num_chn;
1436                 return 0;
1437
1438         case ETHTOOL_GRXFH:
1439                 return netvsc_get_rss_hash_opts(ndc, info);
1440         }
1441         return -EOPNOTSUPP;
1442 }
1443
1444 static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
1445                                     struct ethtool_rxnfc *info)
1446 {
1447         if (info->data == (RXH_IP_SRC | RXH_IP_DST |
1448                            RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
1449                 if (info->flow_type == UDP_V4_FLOW)
1450                         ndc->udp4_l4_hash = true;
1451                 else if (info->flow_type == UDP_V6_FLOW)
1452                         ndc->udp6_l4_hash = true;
1453                 else
1454                         return -EOPNOTSUPP;
1455
1456                 return 0;
1457         }
1458
1459         if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {
1460                 if (info->flow_type == UDP_V4_FLOW)
1461                         ndc->udp4_l4_hash = false;
1462                 else if (info->flow_type == UDP_V6_FLOW)
1463                         ndc->udp6_l4_hash = false;
1464                 else
1465                         return -EOPNOTSUPP;
1466
1467                 return 0;
1468         }
1469
1470         return -EOPNOTSUPP;
1471 }
1472
1473 static int
1474 netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
1475 {
1476         struct net_device_context *ndc = netdev_priv(ndev);
1477
1478         if (info->cmd == ETHTOOL_SRXFH)
1479                 return netvsc_set_rss_hash_opts(ndc, info);
1480
1481         return -EOPNOTSUPP;
1482 }
1483
1484 #ifdef CONFIG_NET_POLL_CONTROLLER
1485 static void netvsc_poll_controller(struct net_device *dev)
1486 {
1487         struct net_device_context *ndc = netdev_priv(dev);
1488         struct netvsc_device *ndev;
1489         int i;
1490
1491         rcu_read_lock();
1492         ndev = rcu_dereference(ndc->nvdev);
1493         if (ndev) {
1494                 for (i = 0; i < ndev->num_chn; i++) {
1495                         struct netvsc_channel *nvchan = &ndev->chan_table[i];
1496
1497                         napi_schedule(&nvchan->napi);
1498                 }
1499         }
1500         rcu_read_unlock();
1501 }
1502 #endif
1503
1504 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1505 {
1506         return NETVSC_HASH_KEYLEN;
1507 }
1508
1509 static u32 netvsc_rss_indir_size(struct net_device *dev)
1510 {
1511         return ITAB_NUM;
1512 }
1513
1514 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1515                            u8 *hfunc)
1516 {
1517         struct net_device_context *ndc = netdev_priv(dev);
1518         struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1519         struct rndis_device *rndis_dev;
1520         int i;
1521
1522         if (!ndev)
1523                 return -ENODEV;
1524
1525         if (hfunc)
1526                 *hfunc = ETH_RSS_HASH_TOP;      /* Toeplitz */
1527
1528         rndis_dev = ndev->extension;
1529         if (indir) {
1530                 for (i = 0; i < ITAB_NUM; i++)
1531                         indir[i] = ndc->rx_table[i];
1532         }
1533
1534         if (key)
1535                 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1536
1537         return 0;
1538 }
1539
1540 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1541                            const u8 *key, const u8 hfunc)
1542 {
1543         struct net_device_context *ndc = netdev_priv(dev);
1544         struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1545         struct rndis_device *rndis_dev;
1546         int i;
1547
1548         if (!ndev)
1549                 return -ENODEV;
1550
1551         if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1552                 return -EOPNOTSUPP;
1553
1554         rndis_dev = ndev->extension;
1555         if (indir) {
1556                 for (i = 0; i < ITAB_NUM; i++)
1557                         if (indir[i] >= ndev->num_chn)
1558                                 return -EINVAL;
1559
1560                 for (i = 0; i < ITAB_NUM; i++)
1561                         ndc->rx_table[i] = indir[i];
1562         }
1563
1564         if (!key) {
1565                 if (!indir)
1566                         return 0;
1567
1568                 key = rndis_dev->rss_key;
1569         }
1570
1571         return rndis_filter_set_rss_param(rndis_dev, key);
1572 }
1573
1574 /* Hyper-V RNDIS protocol does not have ring in the HW sense.
1575  * It does have pre-allocated receive area which is divided into sections.
1576  */
1577 static void __netvsc_get_ringparam(struct netvsc_device *nvdev,
1578                                    struct ethtool_ringparam *ring)
1579 {
1580         u32 max_buf_size;
1581
1582         ring->rx_pending = nvdev->recv_section_cnt;
1583         ring->tx_pending = nvdev->send_section_cnt;
1584
1585         if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
1586                 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
1587         else
1588                 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
1589
1590         ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;
1591         ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE
1592                 / nvdev->send_section_size;
1593 }
1594
1595 static void netvsc_get_ringparam(struct net_device *ndev,
1596                                  struct ethtool_ringparam *ring)
1597 {
1598         struct net_device_context *ndevctx = netdev_priv(ndev);
1599         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1600
1601         if (!nvdev)
1602                 return;
1603
1604         __netvsc_get_ringparam(nvdev, ring);
1605 }
1606
1607 static int netvsc_set_ringparam(struct net_device *ndev,
1608                                 struct ethtool_ringparam *ring)
1609 {
1610         struct net_device_context *ndevctx = netdev_priv(ndev);
1611         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1612         struct netvsc_device_info device_info;
1613         struct ethtool_ringparam orig;
1614         u32 new_tx, new_rx;
1615         int ret = 0;
1616
1617         if (!nvdev || nvdev->destroy)
1618                 return -ENODEV;
1619
1620         memset(&orig, 0, sizeof(orig));
1621         __netvsc_get_ringparam(nvdev, &orig);
1622
1623         new_tx = clamp_t(u32, ring->tx_pending,
1624                          NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);
1625         new_rx = clamp_t(u32, ring->rx_pending,
1626                          NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);
1627
1628         if (new_tx == orig.tx_pending &&
1629             new_rx == orig.rx_pending)
1630                 return 0;        /* no change */
1631
1632         memset(&device_info, 0, sizeof(device_info));
1633         device_info.num_chn = nvdev->num_chn;
1634         device_info.ring_size = ring_size;
1635         device_info.send_sections = new_tx;
1636         device_info.send_section_size = nvdev->send_section_size;
1637         device_info.recv_sections = new_rx;
1638         device_info.recv_section_size = nvdev->recv_section_size;
1639
1640         ret = netvsc_detach(ndev, nvdev);
1641         if (ret)
1642                 return ret;
1643
1644         ret = netvsc_attach(ndev, &device_info);
1645         if (ret) {
1646                 device_info.send_sections = orig.tx_pending;
1647                 device_info.recv_sections = orig.rx_pending;
1648
1649                 if (netvsc_attach(ndev, &device_info))
1650                         netdev_err(ndev, "restoring ringparam failed");
1651         }
1652
1653         return ret;
1654 }
1655
1656 static const struct ethtool_ops ethtool_ops = {
1657         .get_drvinfo    = netvsc_get_drvinfo,
1658         .get_link       = ethtool_op_get_link,
1659         .get_ethtool_stats = netvsc_get_ethtool_stats,
1660         .get_sset_count = netvsc_get_sset_count,
1661         .get_strings    = netvsc_get_strings,
1662         .get_channels   = netvsc_get_channels,
1663         .set_channels   = netvsc_set_channels,
1664         .get_ts_info    = ethtool_op_get_ts_info,
1665         .get_rxnfc      = netvsc_get_rxnfc,
1666         .set_rxnfc      = netvsc_set_rxnfc,
1667         .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1668         .get_rxfh_indir_size = netvsc_rss_indir_size,
1669         .get_rxfh       = netvsc_get_rxfh,
1670         .set_rxfh       = netvsc_set_rxfh,
1671         .get_link_ksettings = netvsc_get_link_ksettings,
1672         .set_link_ksettings = netvsc_set_link_ksettings,
1673         .get_ringparam  = netvsc_get_ringparam,
1674         .set_ringparam  = netvsc_set_ringparam,
1675 };
1676
1677 static const struct net_device_ops device_ops = {
1678         .ndo_open =                     netvsc_open,
1679         .ndo_stop =                     netvsc_close,
1680         .ndo_start_xmit =               netvsc_start_xmit,
1681         .ndo_change_rx_flags =          netvsc_change_rx_flags,
1682         .ndo_set_rx_mode =              netvsc_set_rx_mode,
1683         .ndo_change_mtu =               netvsc_change_mtu,
1684         .ndo_validate_addr =            eth_validate_addr,
1685         .ndo_set_mac_address =          netvsc_set_mac_addr,
1686         .ndo_select_queue =             netvsc_select_queue,
1687         .ndo_get_stats64 =              netvsc_get_stats64,
1688 #ifdef CONFIG_NET_POLL_CONTROLLER
1689         .ndo_poll_controller =          netvsc_poll_controller,
1690 #endif
1691 };
1692
1693 /*
1694  * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1695  * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1696  * present send GARP packet to network peers with netif_notify_peers().
1697  */
1698 static void netvsc_link_change(struct work_struct *w)
1699 {
1700         struct net_device_context *ndev_ctx =
1701                 container_of(w, struct net_device_context, dwork.work);
1702         struct hv_device *device_obj = ndev_ctx->device_ctx;
1703         struct net_device *net = hv_get_drvdata(device_obj);
1704         struct netvsc_device *net_device;
1705         struct rndis_device *rdev;
1706         struct netvsc_reconfig *event = NULL;
1707         bool notify = false, reschedule = false;
1708         unsigned long flags, next_reconfig, delay;
1709
1710         /* if changes are happening, comeback later */
1711         if (!rtnl_trylock()) {
1712                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1713                 return;
1714         }
1715
1716         net_device = rtnl_dereference(ndev_ctx->nvdev);
1717         if (!net_device)
1718                 goto out_unlock;
1719
1720         rdev = net_device->extension;
1721
1722         next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1723         if (time_is_after_jiffies(next_reconfig)) {
1724                 /* link_watch only sends one notification with current state
1725                  * per second, avoid doing reconfig more frequently. Handle
1726                  * wrap around.
1727                  */
1728                 delay = next_reconfig - jiffies;
1729                 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1730                 schedule_delayed_work(&ndev_ctx->dwork, delay);
1731                 goto out_unlock;
1732         }
1733         ndev_ctx->last_reconfig = jiffies;
1734
1735         spin_lock_irqsave(&ndev_ctx->lock, flags);
1736         if (!list_empty(&ndev_ctx->reconfig_events)) {
1737                 event = list_first_entry(&ndev_ctx->reconfig_events,
1738                                          struct netvsc_reconfig, list);
1739                 list_del(&event->list);
1740                 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1741         }
1742         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1743
1744         if (!event)
1745                 goto out_unlock;
1746
1747         switch (event->event) {
1748                 /* Only the following events are possible due to the check in
1749                  * netvsc_linkstatus_callback()
1750                  */
1751         case RNDIS_STATUS_MEDIA_CONNECT:
1752                 if (rdev->link_state) {
1753                         rdev->link_state = false;
1754                         netif_carrier_on(net);
1755                         netvsc_tx_enable(net_device, net);
1756                 } else {
1757                         notify = true;
1758                 }
1759                 kfree(event);
1760                 break;
1761         case RNDIS_STATUS_MEDIA_DISCONNECT:
1762                 if (!rdev->link_state) {
1763                         rdev->link_state = true;
1764                         netif_carrier_off(net);
1765                         netvsc_tx_disable(net_device, net);
1766                 }
1767                 kfree(event);
1768                 break;
1769         case RNDIS_STATUS_NETWORK_CHANGE:
1770                 /* Only makes sense if carrier is present */
1771                 if (!rdev->link_state) {
1772                         rdev->link_state = true;
1773                         netif_carrier_off(net);
1774                         netvsc_tx_disable(net_device, net);
1775                         event->event = RNDIS_STATUS_MEDIA_CONNECT;
1776                         spin_lock_irqsave(&ndev_ctx->lock, flags);
1777                         list_add(&event->list, &ndev_ctx->reconfig_events);
1778                         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1779                         reschedule = true;
1780                 }
1781                 break;
1782         }
1783
1784         rtnl_unlock();
1785
1786         if (notify)
1787                 netdev_notify_peers(net);
1788
1789         /* link_watch only sends one notification with current state per
1790          * second, handle next reconfig event in 2 seconds.
1791          */
1792         if (reschedule)
1793                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1794
1795         return;
1796
1797 out_unlock:
1798         rtnl_unlock();
1799 }
1800
1801 static struct net_device *get_netvsc_bymac(const u8 *mac)
1802 {
1803         struct net_device_context *ndev_ctx;
1804
1805         list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
1806                 struct net_device *dev = hv_get_drvdata(ndev_ctx->device_ctx);
1807
1808                 if (ether_addr_equal(mac, dev->perm_addr))
1809                         return dev;
1810         }
1811
1812         return NULL;
1813 }
1814
1815 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1816 {
1817         struct net_device_context *net_device_ctx;
1818         struct net_device *dev;
1819
1820         dev = netdev_master_upper_dev_get(vf_netdev);
1821         if (!dev || dev->netdev_ops != &device_ops)
1822                 return NULL;    /* not a netvsc device */
1823
1824         net_device_ctx = netdev_priv(dev);
1825         if (!rtnl_dereference(net_device_ctx->nvdev))
1826                 return NULL;    /* device is removed */
1827
1828         return dev;
1829 }
1830
1831 /* Called when VF is injecting data into network stack.
1832  * Change the associated network device from VF to netvsc.
1833  * note: already called with rcu_read_lock
1834  */
1835 static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
1836 {
1837         struct sk_buff *skb = *pskb;
1838         struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);
1839         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1840         struct netvsc_vf_pcpu_stats *pcpu_stats
1841                  = this_cpu_ptr(ndev_ctx->vf_stats);
1842
1843         skb = skb_share_check(skb, GFP_ATOMIC);
1844         if (unlikely(!skb))
1845                 return RX_HANDLER_CONSUMED;
1846
1847         *pskb = skb;
1848
1849         skb->dev = ndev;
1850
1851         u64_stats_update_begin(&pcpu_stats->syncp);
1852         pcpu_stats->rx_packets++;
1853         pcpu_stats->rx_bytes += skb->len;
1854         u64_stats_update_end(&pcpu_stats->syncp);
1855
1856         return RX_HANDLER_ANOTHER;
1857 }
1858
1859 static int netvsc_vf_join(struct net_device *vf_netdev,
1860                           struct net_device *ndev)
1861 {
1862         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1863         int ret;
1864
1865         ret = netdev_rx_handler_register(vf_netdev,
1866                                          netvsc_vf_handle_frame, ndev);
1867         if (ret != 0) {
1868                 netdev_err(vf_netdev,
1869                            "can not register netvsc VF receive handler (err = %d)\n",
1870                            ret);
1871                 goto rx_handler_failed;
1872         }
1873
1874         ret = netdev_master_upper_dev_link(vf_netdev, ndev,
1875                                            NULL, NULL);
1876         if (ret != 0) {
1877                 netdev_err(vf_netdev,
1878                            "can not set master device %s (err = %d)\n",
1879                            ndev->name, ret);
1880                 goto upper_link_failed;
1881         }
1882
1883         /* set slave flag before open to prevent IPv6 addrconf */
1884         vf_netdev->flags |= IFF_SLAVE;
1885
1886         schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
1887
1888         call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
1889
1890         netdev_info(vf_netdev, "joined to %s\n", ndev->name);
1891         return 0;
1892
1893 upper_link_failed:
1894         netdev_rx_handler_unregister(vf_netdev);
1895 rx_handler_failed:
1896         return ret;
1897 }
1898
1899 static void __netvsc_vf_setup(struct net_device *ndev,
1900                               struct net_device *vf_netdev)
1901 {
1902         int ret;
1903
1904         /* Align MTU of VF with master */
1905         ret = dev_set_mtu(vf_netdev, ndev->mtu);
1906         if (ret)
1907                 netdev_warn(vf_netdev,
1908                             "unable to change mtu to %u\n", ndev->mtu);
1909
1910         /* set multicast etc flags on VF */
1911         dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE);
1912
1913         /* sync address list from ndev to VF */
1914         netif_addr_lock_bh(ndev);
1915         dev_uc_sync(vf_netdev, ndev);
1916         dev_mc_sync(vf_netdev, ndev);
1917         netif_addr_unlock_bh(ndev);
1918
1919         if (netif_running(ndev)) {
1920                 ret = dev_open(vf_netdev);
1921                 if (ret)
1922                         netdev_warn(vf_netdev,
1923                                     "unable to open: %d\n", ret);
1924         }
1925 }
1926
1927 /* Setup VF as slave of the synthetic device.
1928  * Runs in workqueue to avoid recursion in netlink callbacks.
1929  */
1930 static void netvsc_vf_setup(struct work_struct *w)
1931 {
1932         struct net_device_context *ndev_ctx
1933                 = container_of(w, struct net_device_context, vf_takeover.work);
1934         struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
1935         struct net_device *vf_netdev;
1936
1937         if (!rtnl_trylock()) {
1938                 schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
1939                 return;
1940         }
1941
1942         vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
1943         if (vf_netdev)
1944                 __netvsc_vf_setup(ndev, vf_netdev);
1945
1946         rtnl_unlock();
1947 }
1948
1949 static int netvsc_register_vf(struct net_device *vf_netdev)
1950 {
1951         struct net_device *ndev;
1952         struct net_device_context *net_device_ctx;
1953         struct device *pdev = vf_netdev->dev.parent;
1954         struct netvsc_device *netvsc_dev;
1955
1956         if (vf_netdev->addr_len != ETH_ALEN)
1957                 return NOTIFY_DONE;
1958
1959         if (!pdev || !dev_is_pci(pdev) || dev_is_pf(pdev))
1960                 return NOTIFY_DONE;
1961
1962         /*
1963          * We will use the MAC address to locate the synthetic interface to
1964          * associate with the VF interface. If we don't find a matching
1965          * synthetic interface, move on.
1966          */
1967         ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1968         if (!ndev)
1969                 return NOTIFY_DONE;
1970
1971         net_device_ctx = netdev_priv(ndev);
1972         netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1973         if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1974                 return NOTIFY_DONE;
1975
1976         if (netvsc_vf_join(vf_netdev, ndev) != 0)
1977                 return NOTIFY_DONE;
1978
1979         netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1980
1981         dev_hold(vf_netdev);
1982         rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1983         return NOTIFY_OK;
1984 }
1985
1986 /* VF up/down change detected, schedule to change data path */
1987 static int netvsc_vf_changed(struct net_device *vf_netdev)
1988 {
1989         struct net_device_context *net_device_ctx;
1990         struct netvsc_device *netvsc_dev;
1991         struct net_device *ndev;
1992         bool vf_is_up = netif_running(vf_netdev);
1993
1994         ndev = get_netvsc_byref(vf_netdev);
1995         if (!ndev)
1996                 return NOTIFY_DONE;
1997
1998         net_device_ctx = netdev_priv(ndev);
1999         netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
2000         if (!netvsc_dev)
2001                 return NOTIFY_DONE;
2002
2003         netvsc_switch_datapath(ndev, vf_is_up);
2004         netdev_info(ndev, "Data path switched %s VF: %s\n",
2005                     vf_is_up ? "to" : "from", vf_netdev->name);
2006
2007         return NOTIFY_OK;
2008 }
2009
2010 static int netvsc_unregister_vf(struct net_device *vf_netdev)
2011 {
2012         struct net_device *ndev;
2013         struct net_device_context *net_device_ctx;
2014
2015         ndev = get_netvsc_byref(vf_netdev);
2016         if (!ndev)
2017                 return NOTIFY_DONE;
2018
2019         net_device_ctx = netdev_priv(ndev);
2020         cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
2021
2022         netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
2023
2024         netdev_rx_handler_unregister(vf_netdev);
2025         netdev_upper_dev_unlink(vf_netdev, ndev);
2026         RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
2027         dev_put(vf_netdev);
2028
2029         return NOTIFY_OK;
2030 }
2031
2032 static int netvsc_probe(struct hv_device *dev,
2033                         const struct hv_vmbus_device_id *dev_id)
2034 {
2035         struct net_device *net = NULL;
2036         struct net_device_context *net_device_ctx;
2037         struct netvsc_device_info device_info;
2038         struct netvsc_device *nvdev;
2039         int ret = -ENOMEM;
2040
2041         net = alloc_etherdev_mq(sizeof(struct net_device_context),
2042                                 VRSS_CHANNEL_MAX);
2043         if (!net)
2044                 goto no_net;
2045
2046         netif_carrier_off(net);
2047
2048         netvsc_init_settings(net);
2049
2050         net_device_ctx = netdev_priv(net);
2051         net_device_ctx->device_ctx = dev;
2052         net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
2053         if (netif_msg_probe(net_device_ctx))
2054                 netdev_dbg(net, "netvsc msg_enable: %d\n",
2055                            net_device_ctx->msg_enable);
2056
2057         hv_set_drvdata(dev, net);
2058
2059         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
2060
2061         spin_lock_init(&net_device_ctx->lock);
2062         INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
2063         INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
2064
2065         net_device_ctx->vf_stats
2066                 = netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
2067         if (!net_device_ctx->vf_stats)
2068                 goto no_stats;
2069
2070         net->netdev_ops = &device_ops;
2071         net->ethtool_ops = &ethtool_ops;
2072         SET_NETDEV_DEV(net, &dev->device);
2073
2074         /* We always need headroom for rndis header */
2075         net->needed_headroom = RNDIS_AND_PPI_SIZE;
2076
2077         /* Initialize the number of queues to be 1, we may change it if more
2078          * channels are offered later.
2079          */
2080         netif_set_real_num_tx_queues(net, 1);
2081         netif_set_real_num_rx_queues(net, 1);
2082
2083         /* Notify the netvsc driver of the new device */
2084         memset(&device_info, 0, sizeof(device_info));
2085         device_info.ring_size = ring_size;
2086         device_info.num_chn = VRSS_CHANNEL_DEFAULT;
2087         device_info.send_sections = NETVSC_DEFAULT_TX;
2088         device_info.send_section_size = NETVSC_SEND_SECTION_SIZE;
2089         device_info.recv_sections = NETVSC_DEFAULT_RX;
2090         device_info.recv_section_size = NETVSC_RECV_SECTION_SIZE;
2091
2092         nvdev = rndis_filter_device_add(dev, &device_info);
2093         if (IS_ERR(nvdev)) {
2094                 ret = PTR_ERR(nvdev);
2095                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
2096                 goto rndis_failed;
2097         }
2098
2099         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
2100
2101         /* We must get rtnl lock before scheduling nvdev->subchan_work,
2102          * otherwise netvsc_subchan_work() can get rtnl lock first and wait
2103          * all subchannels to show up, but that may not happen because
2104          * netvsc_probe() can't get rtnl lock and as a result vmbus_onoffer()
2105          * -> ... -> device_add() -> ... -> __device_attach() can't get
2106          * the device lock, so all the subchannels can't be processed --
2107          * finally netvsc_subchan_work() hangs for ever.
2108          */
2109         rtnl_lock();
2110
2111         if (nvdev->num_chn > 1)
2112                 schedule_work(&nvdev->subchan_work);
2113
2114         /* hw_features computed in rndis_netdev_set_hwcaps() */
2115         net->features = net->hw_features |
2116                 NETIF_F_HIGHDMA | NETIF_F_SG |
2117                 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2118         net->vlan_features = net->features;
2119
2120         netdev_lockdep_set_classes(net);
2121
2122         /* MTU range: 68 - 1500 or 65521 */
2123         net->min_mtu = NETVSC_MTU_MIN;
2124         if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
2125                 net->max_mtu = NETVSC_MTU - ETH_HLEN;
2126         else
2127                 net->max_mtu = ETH_DATA_LEN;
2128
2129         ret = register_netdevice(net);
2130         if (ret != 0) {
2131                 pr_err("Unable to register netdev.\n");
2132                 goto register_failed;
2133         }
2134
2135         list_add(&net_device_ctx->list, &netvsc_dev_list);
2136         rtnl_unlock();
2137         return 0;
2138
2139 register_failed:
2140         rtnl_unlock();
2141         rndis_filter_device_remove(dev, nvdev);
2142 rndis_failed:
2143         free_percpu(net_device_ctx->vf_stats);
2144 no_stats:
2145         hv_set_drvdata(dev, NULL);
2146         free_netdev(net);
2147 no_net:
2148         return ret;
2149 }
2150
2151 static int netvsc_remove(struct hv_device *dev)
2152 {
2153         struct net_device_context *ndev_ctx;
2154         struct net_device *vf_netdev, *net;
2155         struct netvsc_device *nvdev;
2156
2157         net = hv_get_drvdata(dev);
2158         if (net == NULL) {
2159                 dev_err(&dev->device, "No net device to remove\n");
2160                 return 0;
2161         }
2162
2163         ndev_ctx = netdev_priv(net);
2164
2165         cancel_delayed_work_sync(&ndev_ctx->dwork);
2166
2167         rtnl_lock();
2168         nvdev = rtnl_dereference(ndev_ctx->nvdev);
2169         if (nvdev)
2170                 cancel_work_sync(&nvdev->subchan_work);
2171
2172         /*
2173          * Call to the vsc driver to let it know that the device is being
2174          * removed. Also blocks mtu and channel changes.
2175          */
2176         vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
2177         if (vf_netdev)
2178                 netvsc_unregister_vf(vf_netdev);
2179
2180         if (nvdev)
2181                 rndis_filter_device_remove(dev, nvdev);
2182
2183         unregister_netdevice(net);
2184         list_del(&ndev_ctx->list);
2185
2186         rtnl_unlock();
2187
2188         hv_set_drvdata(dev, NULL);
2189
2190         free_percpu(ndev_ctx->vf_stats);
2191         free_netdev(net);
2192         return 0;
2193 }
2194
2195 static const struct hv_vmbus_device_id id_table[] = {
2196         /* Network guid */
2197         { HV_NIC_GUID, },
2198         { },
2199 };
2200
2201 MODULE_DEVICE_TABLE(vmbus, id_table);
2202
2203 /* The one and only one */
2204 static struct  hv_driver netvsc_drv = {
2205         .name = KBUILD_MODNAME,
2206         .id_table = id_table,
2207         .probe = netvsc_probe,
2208         .remove = netvsc_remove,
2209 };
2210
2211 /*
2212  * On Hyper-V, every VF interface is matched with a corresponding
2213  * synthetic interface. The synthetic interface is presented first
2214  * to the guest. When the corresponding VF instance is registered,
2215  * we will take care of switching the data path.
2216  */
2217 static int netvsc_netdev_event(struct notifier_block *this,
2218                                unsigned long event, void *ptr)
2219 {
2220         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2221
2222         /* Skip our own events */
2223         if (event_dev->netdev_ops == &device_ops)
2224                 return NOTIFY_DONE;
2225
2226         /* Avoid non-Ethernet type devices */
2227         if (event_dev->type != ARPHRD_ETHER)
2228                 return NOTIFY_DONE;
2229
2230         /* Avoid Vlan dev with same MAC registering as VF */
2231         if (is_vlan_dev(event_dev))
2232                 return NOTIFY_DONE;
2233
2234         /* Avoid Bonding master dev with same MAC registering as VF */
2235         if ((event_dev->priv_flags & IFF_BONDING) &&
2236             (event_dev->flags & IFF_MASTER))
2237                 return NOTIFY_DONE;
2238
2239         switch (event) {
2240         case NETDEV_REGISTER:
2241                 return netvsc_register_vf(event_dev);
2242         case NETDEV_UNREGISTER:
2243                 return netvsc_unregister_vf(event_dev);
2244         case NETDEV_UP:
2245         case NETDEV_DOWN:
2246                 return netvsc_vf_changed(event_dev);
2247         default:
2248                 return NOTIFY_DONE;
2249         }
2250 }
2251
2252 static struct notifier_block netvsc_netdev_notifier = {
2253         .notifier_call = netvsc_netdev_event,
2254 };
2255
2256 static void __exit netvsc_drv_exit(void)
2257 {
2258         unregister_netdevice_notifier(&netvsc_netdev_notifier);
2259         vmbus_driver_unregister(&netvsc_drv);
2260 }
2261
2262 static int __init netvsc_drv_init(void)
2263 {
2264         int ret;
2265
2266         if (ring_size < RING_SIZE_MIN) {
2267                 ring_size = RING_SIZE_MIN;
2268                 pr_info("Increased ring_size to %d (min allowed)\n",
2269                         ring_size);
2270         }
2271         ret = vmbus_driver_register(&netvsc_drv);
2272
2273         if (ret)
2274                 return ret;
2275
2276         register_netdevice_notifier(&netvsc_netdev_notifier);
2277         return 0;
2278 }
2279
2280 MODULE_LICENSE("GPL");
2281 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
2282
2283 module_init(netvsc_drv_init);
2284 module_exit(netvsc_drv_exit);