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 <linux/rtnetlink.h>
  37 #include <linux/netpoll.h>
  38
  39 #include <net/arp.h>
  40 #include <net/route.h>
  41 #include <net/sock.h>
  42 #include <net/pkt_sched.h>
  43 #include <net/checksum.h>
  44 #include <net/ip6_checksum.h>
  45
  46 #include "hyperv_net.h"
  47
  48 #define RING_SIZE_MIN           64
  49 #define NETVSC_MIN_TX_SECTIONS  10
  50 #define NETVSC_DEFAULT_TX       192     /* ~1M */
  51 #define NETVSC_MIN_RX_SECTIONS  10      /* ~64K */
  52 #define NETVSC_DEFAULT_RX       2048    /* ~4M */
  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 void netvsc_set_multicast_list(struct net_device *net)
  71 {
  72         struct net_device_context *net_device_ctx = netdev_priv(net);
  73         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
  74
  75         rndis_filter_update(nvdev);
  76 }
  77
  78 static int netvsc_open(struct net_device *net)
  79 {
  80         struct net_device_context *ndev_ctx = netdev_priv(net);
  81         struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
  82         struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);
  83         struct rndis_device *rdev;
  84         int ret = 0;
  85
  86         netif_carrier_off(net);
  87
  88         /* Open up the device */
  89         ret = rndis_filter_open(nvdev);
  90         if (ret != 0) {
  91                 netdev_err(net, "unable to open device (ret %d).\n", ret);
  92                 return ret;
  93         }
  94
  95         netif_tx_wake_all_queues(net);
  96
  97         rdev = nvdev->extension;
  98
  99         if (!rdev->link_state)
 100                 netif_carrier_on(net);
 101
 102         if (vf_netdev) {
 103                 /* Setting synthetic device up transparently sets
 104                  * slave as up. If open fails, then slave will be
 105                  * still be offline (and not used).
 106                  */
 107                 ret = dev_open(vf_netdev);
 108                 if (ret)
 109                         netdev_warn(net,
 110                                     "unable to open slave: %s: %d\n",
 111                                     vf_netdev->name, ret);
 112         }
 113         return 0;
 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 net_device *vf_netdev
 120                 = rtnl_dereference(net_device_ctx->vf_netdev);
 121         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 122         int ret = 0;
 123         u32 aread, i, msec = 10, retry = 0, retry_max = 20;
 124         struct vmbus_channel *chn;
 125
 126         netif_tx_disable(net);
 127
 128         /* No need to close rndis filter if it is removed already */
 129         if (!nvdev)
 130                 goto out;
 131
 132         ret = rndis_filter_close(nvdev);
 133         if (ret != 0) {
 134                 netdev_err(net, "unable to close device (ret %d).\n", ret);
 135                 return ret;
 136         }
 137
 138         /* Ensure pending bytes in ring are read */
 139         while (true) {
 140                 aread = 0;
 141                 for (i = 0; i < nvdev->num_chn; i++) {
 142                         chn = nvdev->chan_table[i].channel;
 143                         if (!chn)
 144                                 continue;
 145
 146                         aread = hv_get_bytes_to_read(&chn->inbound);
 147                         if (aread)
 148                                 break;
 149
 150                         aread = hv_get_bytes_to_read(&chn->outbound);
 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 out:
 171         if (vf_netdev)
 172                 dev_close(vf_netdev);
 173
 174         return ret;
 175 }
 176
 177 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
 178                            int pkt_type)
 179 {
 180         struct rndis_packet *rndis_pkt;
 181         struct rndis_per_packet_info *ppi;
 182
 183         rndis_pkt = &msg->msg.pkt;
 184         rndis_pkt->data_offset += ppi_size;
 185
 186         ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
 187                 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
 188
 189         ppi->size = ppi_size;
 190         ppi->type = pkt_type;
 191         ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
 192
 193         rndis_pkt->per_pkt_info_len += ppi_size;
 194
 195         return ppi;
 196 }
 197
 198 /* Azure hosts don't support non-TCP port numbers in hashing for fragmented
 199  * packets. We can use ethtool to change UDP hash level when necessary.
 200  */
 201 static inline u32 netvsc_get_hash(
 202         struct sk_buff *skb,
 203         const struct net_device_context *ndc)
 204 {
 205         struct flow_keys flow;
 206         u32 hash;
 207         static u32 hashrnd __read_mostly;
 208
 209         net_get_random_once(&hashrnd, sizeof(hashrnd));
 210
 211         if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
 212                 return 0;
 213
 214         if (flow.basic.ip_proto == IPPROTO_TCP ||
 215             (flow.basic.ip_proto == IPPROTO_UDP &&
 216              ((flow.basic.n_proto == htons(ETH_P_IP) && ndc->udp4_l4_hash) ||
 217               (flow.basic.n_proto == htons(ETH_P_IPV6) &&
 218                ndc->udp6_l4_hash)))) {
 219                 return skb_get_hash(skb);
 220         } else {
 221                 if (flow.basic.n_proto == htons(ETH_P_IP))
 222                         hash = jhash2((u32 *)&flow.addrs.v4addrs, 2, hashrnd);
 223                 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
 224                         hash = jhash2((u32 *)&flow.addrs.v6addrs, 8, hashrnd);
 225                 else
 226                         hash = 0;
 227
 228                 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
 229         }
 230
 231         return hash;
 232 }
 233
 234 static inline int netvsc_get_tx_queue(struct net_device *ndev,
 235                                       struct sk_buff *skb, int old_idx)
 236 {
 237         const struct net_device_context *ndc = netdev_priv(ndev);
 238         struct sock *sk = skb->sk;
 239         int q_idx;
 240
 241         q_idx = ndc->tx_send_table[netvsc_get_hash(skb, ndc) &
 242                                    (VRSS_SEND_TAB_SIZE - 1)];
 243
 244         /* If queue index changed record the new value */
 245         if (q_idx != old_idx &&
 246             sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
 247                 sk_tx_queue_set(sk, q_idx);
 248
 249         return q_idx;
 250 }
 251
 252 /*
 253  * Select queue for transmit.
 254  *
 255  * If a valid queue has already been assigned, then use that.
 256  * Otherwise compute tx queue based on hash and the send table.
 257  *
 258  * This is basically similar to default (__netdev_pick_tx) with the added step
 259  * of using the host send_table when no other queue has been assigned.
 260  *
 261  * TODO support XPS - but get_xps_queue not exported
 262  */
 263 static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)
 264 {
 265         int q_idx = sk_tx_queue_get(skb->sk);
 266
 267         if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {
 268                 /* If forwarding a packet, we use the recorded queue when
 269                  * available for better cache locality.
 270                  */
 271                 if (skb_rx_queue_recorded(skb))
 272                         q_idx = skb_get_rx_queue(skb);
 273                 else
 274                         q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);
 275         }
 276
 277         return q_idx;
 278 }
 279
 280 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
 281                                void *accel_priv,
 282                                select_queue_fallback_t fallback)
 283 {
 284         struct net_device_context *ndc = netdev_priv(ndev);
 285         struct net_device *vf_netdev;
 286         u16 txq;
 287
 288         rcu_read_lock();
 289         vf_netdev = rcu_dereference(ndc->vf_netdev);
 290         if (vf_netdev) {
 291                 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
 292                 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
 293         } else {
 294                 txq = netvsc_pick_tx(ndev, skb);
 295         }
 296         rcu_read_unlock();
 297
 298         while (unlikely(txq >= ndev->real_num_tx_queues))
 299                 txq -= ndev->real_num_tx_queues;
 300
 301         return txq;
 302 }
 303
 304 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
 305                        struct hv_page_buffer *pb)
 306 {
 307         int j = 0;
 308
 309         /* Deal with compund pages by ignoring unused part
 310          * of the page.
 311          */
 312         page += (offset >> PAGE_SHIFT);
 313         offset &= ~PAGE_MASK;
 314
 315         while (len > 0) {
 316                 unsigned long bytes;
 317
 318                 bytes = PAGE_SIZE - offset;
 319                 if (bytes > len)
 320                         bytes = len;
 321                 pb[j].pfn = page_to_pfn(page);
 322                 pb[j].offset = offset;
 323                 pb[j].len = bytes;
 324
 325                 offset += bytes;
 326                 len -= bytes;
 327
 328                 if (offset == PAGE_SIZE && len) {
 329                         page++;
 330                         offset = 0;
 331                         j++;
 332                 }
 333         }
 334
 335         return j + 1;
 336 }
 337
 338 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
 339                            struct hv_netvsc_packet *packet,
 340                            struct hv_page_buffer *pb)
 341 {
 342         u32 slots_used = 0;
 343         char *data = skb->data;
 344         int frags = skb_shinfo(skb)->nr_frags;
 345         int i;
 346
 347         /* The packet is laid out thus:
 348          * 1. hdr: RNDIS header and PPI
 349          * 2. skb linear data
 350          * 3. skb fragment data
 351          */
 352         slots_used += fill_pg_buf(virt_to_page(hdr),
 353                                   offset_in_page(hdr),
 354                                   len, &pb[slots_used]);
 355
 356         packet->rmsg_size = len;
 357         packet->rmsg_pgcnt = slots_used;
 358
 359         slots_used += fill_pg_buf(virt_to_page(data),
 360                                 offset_in_page(data),
 361                                 skb_headlen(skb), &pb[slots_used]);
 362
 363         for (i = 0; i < frags; i++) {
 364                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 365
 366                 slots_used += fill_pg_buf(skb_frag_page(frag),
 367                                         frag->page_offset,
 368                                         skb_frag_size(frag), &pb[slots_used]);
 369         }
 370         return slots_used;
 371 }
 372
 373 static int count_skb_frag_slots(struct sk_buff *skb)
 374 {
 375         int i, frags = skb_shinfo(skb)->nr_frags;
 376         int pages = 0;
 377
 378         for (i = 0; i < frags; i++) {
 379                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 380                 unsigned long size = skb_frag_size(frag);
 381                 unsigned long offset = frag->page_offset;
 382
 383                 /* Skip unused frames from start of page */
 384                 offset &= ~PAGE_MASK;
 385                 pages += PFN_UP(offset + size);
 386         }
 387         return pages;
 388 }
 389
 390 static int netvsc_get_slots(struct sk_buff *skb)
 391 {
 392         char *data = skb->data;
 393         unsigned int offset = offset_in_page(data);
 394         unsigned int len = skb_headlen(skb);
 395         int slots;
 396         int frag_slots;
 397
 398         slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
 399         frag_slots = count_skb_frag_slots(skb);
 400         return slots + frag_slots;
 401 }
 402
 403 static u32 net_checksum_info(struct sk_buff *skb)
 404 {
 405         if (skb->protocol == htons(ETH_P_IP)) {
 406                 struct iphdr *ip = ip_hdr(skb);
 407
 408                 if (ip->protocol == IPPROTO_TCP)
 409                         return TRANSPORT_INFO_IPV4_TCP;
 410                 else if (ip->protocol == IPPROTO_UDP)
 411                         return TRANSPORT_INFO_IPV4_UDP;
 412         } else {
 413                 struct ipv6hdr *ip6 = ipv6_hdr(skb);
 414
 415                 if (ip6->nexthdr == IPPROTO_TCP)
 416                         return TRANSPORT_INFO_IPV6_TCP;
 417                 else if (ip6->nexthdr == IPPROTO_UDP)
 418                         return TRANSPORT_INFO_IPV6_UDP;
 419         }
 420
 421         return TRANSPORT_INFO_NOT_IP;
 422 }
 423
 424 /* Send skb on the slave VF device. */
 425 static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
 426                           struct sk_buff *skb)
 427 {
 428         struct net_device_context *ndev_ctx = netdev_priv(net);
 429         unsigned int len = skb->len;
 430         int rc;
 431
 432         skb->dev = vf_netdev;
 433         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 434
 435         rc = dev_queue_xmit(skb);
 436         if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {
 437                 struct netvsc_vf_pcpu_stats *pcpu_stats
 438                         = this_cpu_ptr(ndev_ctx->vf_stats);
 439
 440                 u64_stats_update_begin(&pcpu_stats->syncp);
 441                 pcpu_stats->tx_packets++;
 442                 pcpu_stats->tx_bytes += len;
 443                 u64_stats_update_end(&pcpu_stats->syncp);
 444         } else {
 445                 this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);
 446         }
 447
 448         return rc;
 449 }
 450
 451 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 452 {
 453         struct net_device_context *net_device_ctx = netdev_priv(net);
 454         struct hv_netvsc_packet *packet = NULL;
 455         int ret;
 456         unsigned int num_data_pgs;
 457         struct rndis_message *rndis_msg;
 458         struct rndis_packet *rndis_pkt;
 459         struct net_device *vf_netdev;
 460         u32 rndis_msg_size;
 461         struct rndis_per_packet_info *ppi;
 462         u32 hash;
 463         struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
 464
 465         /* if VF is present and up then redirect packets
 466          * already called with rcu_read_lock_bh
 467          */
 468         vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
 469         if (vf_netdev && netif_running(vf_netdev) &&
 470             !netpoll_tx_running(net))
 471                 return netvsc_vf_xmit(net, vf_netdev, skb);
 472
 473         /* We will atmost need two pages to describe the rndis
 474          * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
 475          * of pages in a single packet. If skb is scattered around
 476          * more pages we try linearizing it.
 477          */
 478
 479         num_data_pgs = netvsc_get_slots(skb) + 2;
 480
 481         if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
 482                 ++net_device_ctx->eth_stats.tx_scattered;
 483
 484                 if (skb_linearize(skb))
 485                         goto no_memory;
 486
 487                 num_data_pgs = netvsc_get_slots(skb) + 2;
 488                 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
 489                         ++net_device_ctx->eth_stats.tx_too_big;
 490                         goto drop;
 491                 }
 492         }
 493
 494         /*
 495          * Place the rndis header in the skb head room and
 496          * the skb->cb will be used for hv_netvsc_packet
 497          * structure.
 498          */
 499         ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
 500         if (ret)
 501                 goto no_memory;
 502
 503         /* Use the skb control buffer for building up the packet */
 504         BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
 505                         FIELD_SIZEOF(struct sk_buff, cb));
 506         packet = (struct hv_netvsc_packet *)skb->cb;
 507
 508         packet->q_idx = skb_get_queue_mapping(skb);
 509
 510         packet->total_data_buflen = skb->len;
 511         packet->total_bytes = skb->len;
 512         packet->total_packets = 1;
 513
 514         rndis_msg = (struct rndis_message *)skb->head;
 515
 516         memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
 517
 518         /* Add the rndis header */
 519         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 520         rndis_msg->msg_len = packet->total_data_buflen;
 521         rndis_pkt = &rndis_msg->msg.pkt;
 522         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 523         rndis_pkt->data_len = packet->total_data_buflen;
 524         rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 525
 526         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 527
 528         hash = skb_get_hash_raw(skb);
 529         if (hash != 0 && net->real_num_tx_queues > 1) {
 530                 rndis_msg_size += NDIS_HASH_PPI_SIZE;
 531                 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
 532                                     NBL_HASH_VALUE);
 533                 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
 534         }
 535
 536         if (skb_vlan_tag_present(skb)) {
 537                 struct ndis_pkt_8021q_info *vlan;
 538
 539                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 540                 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
 541                                     IEEE_8021Q_INFO);
 542
 543                 vlan = (void *)ppi + ppi->ppi_offset;
 544                 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
 545                 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
 546                                 VLAN_PRIO_SHIFT;
 547         }
 548
 549         if (skb_is_gso(skb)) {
 550                 struct ndis_tcp_lso_info *lso_info;
 551
 552                 rndis_msg_size += NDIS_LSO_PPI_SIZE;
 553                 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
 554                                     TCP_LARGESEND_PKTINFO);
 555
 556                 lso_info = (void *)ppi + ppi->ppi_offset;
 557
 558                 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
 559                 if (skb->protocol == htons(ETH_P_IP)) {
 560                         lso_info->lso_v2_transmit.ip_version =
 561                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
 562                         ip_hdr(skb)->tot_len = 0;
 563                         ip_hdr(skb)->check = 0;
 564                         tcp_hdr(skb)->check =
 565                                 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 566                                                    ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 567                 } else {
 568                         lso_info->lso_v2_transmit.ip_version =
 569                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
 570                         ipv6_hdr(skb)->payload_len = 0;
 571                         tcp_hdr(skb)->check =
 572                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 573                                                  &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 574                 }
 575                 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
 576                 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 577         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 578                 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
 579                         struct ndis_tcp_ip_checksum_info *csum_info;
 580
 581                         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 582                         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 583                                             TCPIP_CHKSUM_PKTINFO);
 584
 585                         csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 586                                                                          ppi->ppi_offset);
 587
 588                         csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
 589
 590                         if (skb->protocol == htons(ETH_P_IP)) {
 591                                 csum_info->transmit.is_ipv4 = 1;
 592
 593                                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 594                                         csum_info->transmit.tcp_checksum = 1;
 595                                 else
 596                                         csum_info->transmit.udp_checksum = 1;
 597                         } else {
 598                                 csum_info->transmit.is_ipv6 = 1;
 599
 600                                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
 601                                         csum_info->transmit.tcp_checksum = 1;
 602                                 else
 603                                         csum_info->transmit.udp_checksum = 1;
 604                         }
 605                 } else {
 606                         /* Can't do offload of this type of checksum */
 607                         if (skb_checksum_help(skb))
 608                                 goto drop;
 609                 }
 610         }
 611
 612         /* Start filling in the page buffers with the rndis hdr */
 613         rndis_msg->msg_len += rndis_msg_size;
 614         packet->total_data_buflen = rndis_msg->msg_len;
 615         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 616                                                skb, packet, pb);
 617
 618         /* timestamp packet in software */
 619         skb_tx_timestamp(skb);
 620
 621         ret = netvsc_send(net_device_ctx, packet, rndis_msg, pb, skb);
 622         if (likely(ret == 0))
 623                 return NETDEV_TX_OK;
 624
 625         if (ret == -EAGAIN) {
 626                 ++net_device_ctx->eth_stats.tx_busy;
 627                 return NETDEV_TX_BUSY;
 628         }
 629
 630         if (ret == -ENOSPC)
 631                 ++net_device_ctx->eth_stats.tx_no_space;
 632
 633 drop:
 634         dev_kfree_skb_any(skb);
 635         net->stats.tx_dropped++;
 636
 637         return NETDEV_TX_OK;
 638
 639 no_memory:
 640         ++net_device_ctx->eth_stats.tx_no_memory;
 641         goto drop;
 642 }
 643
 644 /*
 645  * netvsc_linkstatus_callback - Link up/down notification
 646  */
 647 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 648                                 struct rndis_message *resp)
 649 {
 650         struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
 651         struct net_device *net;
 652         struct net_device_context *ndev_ctx;
 653         struct netvsc_reconfig *event;
 654         unsigned long flags;
 655
 656         net = hv_get_drvdata(device_obj);
 657
 658         if (!net)
 659                 return;
 660
 661         ndev_ctx = netdev_priv(net);
 662
 663         /* Update the physical link speed when changing to another vSwitch */
 664         if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
 665                 u32 speed;
 666
 667                 speed = *(u32 *)((void *)indicate
 668                                  + indicate->status_buf_offset) / 10000;
 669                 ndev_ctx->speed = speed;
 670                 return;
 671         }
 672
 673         /* Handle these link change statuses below */
 674         if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
 675             indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
 676             indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
 677                 return;
 678
 679         if (net->reg_state != NETREG_REGISTERED)
 680                 return;
 681
 682         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 683         if (!event)
 684                 return;
 685         event->event = indicate->status;
 686
 687         spin_lock_irqsave(&ndev_ctx->lock, flags);
 688         list_add_tail(&event->list, &ndev_ctx->reconfig_events);
 689         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
 690
 691         schedule_delayed_work(&ndev_ctx->dwork, 0);
 692 }
 693
 694 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 695                                              struct napi_struct *napi,
 696                                              const struct ndis_tcp_ip_checksum_info *csum_info,
 697                                              const struct ndis_pkt_8021q_info *vlan,
 698                                              void *data, u32 buflen)
 699 {
 700         struct sk_buff *skb;
 701
 702         skb = napi_alloc_skb(napi, buflen);
 703         if (!skb)
 704                 return skb;
 705
 706         /*
 707          * Copy to skb. This copy is needed here since the memory pointed by
 708          * hv_netvsc_packet cannot be deallocated
 709          */
 710         skb_put_data(skb, data, buflen);
 711
 712         skb->protocol = eth_type_trans(skb, net);
 713
 714         /* skb is already created with CHECKSUM_NONE */
 715         skb_checksum_none_assert(skb);
 716
 717         /*
 718          * In Linux, the IP checksum is always checked.
 719          * Do L4 checksum offload if enabled and present.
 720          */
 721         if (csum_info && (net->features & NETIF_F_RXCSUM)) {
 722                 if (csum_info->receive.tcp_checksum_succeeded ||
 723                     csum_info->receive.udp_checksum_succeeded)
 724                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 725         }
 726
 727         if (vlan) {
 728                 u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
 729
 730                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 731                                        vlan_tci);
 732         }
 733
 734         return skb;
 735 }
 736
 737 /*
 738  * netvsc_recv_callback -  Callback when we receive a packet from the
 739  * "wire" on the specified device.
 740  */
 741 int netvsc_recv_callback(struct net_device *net,
 742                          struct vmbus_channel *channel,
 743                          void  *data, u32 len,
 744                          const struct ndis_tcp_ip_checksum_info *csum_info,
 745                          const struct ndis_pkt_8021q_info *vlan)
 746 {
 747         struct net_device_context *net_device_ctx = netdev_priv(net);
 748         struct netvsc_device *net_device;
 749         u16 q_idx = channel->offermsg.offer.sub_channel_index;
 750         struct netvsc_channel *nvchan;
 751         struct sk_buff *skb;
 752         struct netvsc_stats *rx_stats;
 753
 754         if (net->reg_state != NETREG_REGISTERED)
 755                 return NVSP_STAT_FAIL;
 756
 757         rcu_read_lock();
 758         net_device = rcu_dereference(net_device_ctx->nvdev);
 759         if (unlikely(!net_device))
 760                 goto drop;
 761
 762         nvchan = &net_device->chan_table[q_idx];
 763
 764         /* Allocate a skb - TODO direct I/O to pages? */
 765         skb = netvsc_alloc_recv_skb(net, &nvchan->napi,
 766                                     csum_info, vlan, data, len);
 767         if (unlikely(!skb)) {
 768 drop:
 769                 ++net->stats.rx_dropped;
 770                 rcu_read_unlock();
 771                 return NVSP_STAT_FAIL;
 772         }
 773
 774         skb_record_rx_queue(skb, q_idx);
 775
 776         /*
 777          * Even if injecting the packet, record the statistics
 778          * on the synthetic device because modifying the VF device
 779          * statistics will not work correctly.
 780          */
 781         rx_stats = &nvchan->rx_stats;
 782         u64_stats_update_begin(&rx_stats->syncp);
 783         rx_stats->packets++;
 784         rx_stats->bytes += len;
 785
 786         if (skb->pkt_type == PACKET_BROADCAST)
 787                 ++rx_stats->broadcast;
 788         else if (skb->pkt_type == PACKET_MULTICAST)
 789                 ++rx_stats->multicast;
 790         u64_stats_update_end(&rx_stats->syncp);
 791
 792         napi_gro_receive(&nvchan->napi, skb);
 793         rcu_read_unlock();
 794
 795         return 0;
 796 }
 797
 798 static void netvsc_get_drvinfo(struct net_device *net,
 799                                struct ethtool_drvinfo *info)
 800 {
 801         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 802         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 803 }
 804
 805 static void netvsc_get_channels(struct net_device *net,
 806                                 struct ethtool_channels *channel)
 807 {
 808         struct net_device_context *net_device_ctx = netdev_priv(net);
 809         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 810
 811         if (nvdev) {
 812                 channel->max_combined   = nvdev->max_chn;
 813                 channel->combined_count = nvdev->num_chn;
 814         }
 815 }
 816
 817 static int netvsc_set_channels(struct net_device *net,
 818                                struct ethtool_channels *channels)
 819 {
 820         struct net_device_context *net_device_ctx = netdev_priv(net);
 821         struct hv_device *dev = net_device_ctx->device_ctx;
 822         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 823         unsigned int orig, count = channels->combined_count;
 824         struct netvsc_device_info device_info;
 825         bool was_opened;
 826         int ret = 0;
 827
 828         /* We do not support separate count for rx, tx, or other */
 829         if (count == 0 ||
 830             channels->rx_count || channels->tx_count || channels->other_count)
 831                 return -EINVAL;
 832
 833         if (count > net->num_tx_queues || count > VRSS_CHANNEL_MAX)
 834                 return -EINVAL;
 835
 836         if (!nvdev || nvdev->destroy)
 837                 return -ENODEV;
 838
 839         if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
 840                 return -EINVAL;
 841
 842         if (count > nvdev->max_chn)
 843                 return -EINVAL;
 844
 845         orig = nvdev->num_chn;
 846         was_opened = rndis_filter_opened(nvdev);
 847         if (was_opened)
 848                 rndis_filter_close(nvdev);
 849
 850         memset(&device_info, 0, sizeof(device_info));
 851         device_info.num_chn = count;
 852         device_info.ring_size = ring_size;
 853         device_info.send_sections = nvdev->send_section_cnt;
 854         device_info.recv_sections = nvdev->recv_section_cnt;
 855
 856         rndis_filter_device_remove(dev, nvdev);
 857
 858         nvdev = rndis_filter_device_add(dev, &device_info);
 859         if (!IS_ERR(nvdev)) {
 860                 netif_set_real_num_tx_queues(net, nvdev->num_chn);
 861                 netif_set_real_num_rx_queues(net, nvdev->num_chn);
 862         } else {
 863                 ret = PTR_ERR(nvdev);
 864                 device_info.num_chn = orig;
 865                 nvdev = rndis_filter_device_add(dev, &device_info);
 866
 867                 if (IS_ERR(nvdev)) {
 868                         netdev_err(net, "restoring channel setting failed: %ld\n",
 869                                    PTR_ERR(nvdev));
 870                         return ret;
 871                 }
 872         }
 873
 874         if (was_opened)
 875                 rndis_filter_open(nvdev);
 876
 877         /* We may have missed link change notifications */
 878         net_device_ctx->last_reconfig = 0;
 879         schedule_delayed_work(&net_device_ctx->dwork, 0);
 880
 881         return ret;
 882 }
 883
 884 static bool
 885 netvsc_validate_ethtool_ss_cmd(const struct ethtool_link_ksettings *cmd)
 886 {
 887         struct ethtool_link_ksettings diff1 = *cmd;
 888         struct ethtool_link_ksettings diff2 = {};
 889
 890         diff1.base.speed = 0;
 891         diff1.base.duplex = 0;
 892         /* advertising and cmd are usually set */
 893         ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
 894         diff1.base.cmd = 0;
 895         /* We set port to PORT_OTHER */
 896         diff2.base.port = PORT_OTHER;
 897
 898         return !memcmp(&diff1, &diff2, sizeof(diff1));
 899 }
 900
 901 static void netvsc_init_settings(struct net_device *dev)
 902 {
 903         struct net_device_context *ndc = netdev_priv(dev);
 904
 905         ndc->udp4_l4_hash = true;
 906         ndc->udp6_l4_hash = true;
 907
 908         ndc->speed = SPEED_UNKNOWN;
 909         ndc->duplex = DUPLEX_FULL;
 910 }
 911
 912 static int netvsc_get_link_ksettings(struct net_device *dev,
 913                                      struct ethtool_link_ksettings *cmd)
 914 {
 915         struct net_device_context *ndc = netdev_priv(dev);
 916
 917         cmd->base.speed = ndc->speed;
 918         cmd->base.duplex = ndc->duplex;
 919         cmd->base.port = PORT_OTHER;
 920
 921         return 0;
 922 }
 923
 924 static int netvsc_set_link_ksettings(struct net_device *dev,
 925                                      const struct ethtool_link_ksettings *cmd)
 926 {
 927         struct net_device_context *ndc = netdev_priv(dev);
 928         u32 speed;
 929
 930         speed = cmd->base.speed;
 931         if (!ethtool_validate_speed(speed) ||
 932             !ethtool_validate_duplex(cmd->base.duplex) ||
 933             !netvsc_validate_ethtool_ss_cmd(cmd))
 934                 return -EINVAL;
 935
 936         ndc->speed = speed;
 937         ndc->duplex = cmd->base.duplex;
 938
 939         return 0;
 940 }
 941
 942 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 943 {
 944         struct net_device_context *ndevctx = netdev_priv(ndev);
 945         struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
 946         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
 947         struct hv_device *hdev = ndevctx->device_ctx;
 948         int orig_mtu = ndev->mtu;
 949         struct netvsc_device_info device_info;
 950         bool was_opened;
 951         int ret = 0;
 952
 953         if (!nvdev || nvdev->destroy)
 954                 return -ENODEV;
 955
 956         /* Change MTU of underlying VF netdev first. */
 957         if (vf_netdev) {
 958                 ret = dev_set_mtu(vf_netdev, mtu);
 959                 if (ret)
 960                         return ret;
 961         }
 962
 963         netif_device_detach(ndev);
 964         was_opened = rndis_filter_opened(nvdev);
 965         if (was_opened)
 966                 rndis_filter_close(nvdev);
 967
 968         memset(&device_info, 0, sizeof(device_info));
 969         device_info.ring_size = ring_size;
 970         device_info.num_chn = nvdev->num_chn;
 971         device_info.send_sections = nvdev->send_section_cnt;
 972         device_info.recv_sections = nvdev->recv_section_cnt;
 973
 974         rndis_filter_device_remove(hdev, nvdev);
 975
 976         ndev->mtu = mtu;
 977
 978         nvdev = rndis_filter_device_add(hdev, &device_info);
 979         if (IS_ERR(nvdev)) {
 980                 ret = PTR_ERR(nvdev);
 981
 982                 /* Attempt rollback to original MTU */
 983                 ndev->mtu = orig_mtu;
 984                 nvdev = rndis_filter_device_add(hdev, &device_info);
 985
 986                 if (vf_netdev)
 987                         dev_set_mtu(vf_netdev, orig_mtu);
 988
 989                 if (IS_ERR(nvdev)) {
 990                         netdev_err(ndev, "restoring mtu failed: %ld\n",
 991                                    PTR_ERR(nvdev));
 992                         return ret;
 993                 }
 994         }
 995
 996         if (was_opened)
 997                 rndis_filter_open(nvdev);
 998
 999         netif_device_attach(ndev);
1000
1001         /* We may have missed link change notifications */
1002         schedule_delayed_work(&ndevctx->dwork, 0);
1003
1004         return ret;
1005 }
1006
1007 static void netvsc_get_vf_stats(struct net_device *net,
1008                                 struct netvsc_vf_pcpu_stats *tot)
1009 {
1010         struct net_device_context *ndev_ctx = netdev_priv(net);
1011         int i;
1012
1013         memset(tot, 0, sizeof(*tot));
1014
1015         for_each_possible_cpu(i) {
1016                 const struct netvsc_vf_pcpu_stats *stats
1017                         = per_cpu_ptr(ndev_ctx->vf_stats, i);
1018                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1019                 unsigned int start;
1020
1021                 do {
1022                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1023                         rx_packets = stats->rx_packets;
1024                         tx_packets = stats->tx_packets;
1025                         rx_bytes = stats->rx_bytes;
1026                         tx_bytes = stats->tx_bytes;
1027                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1028
1029                 tot->rx_packets += rx_packets;
1030                 tot->tx_packets += tx_packets;
1031                 tot->rx_bytes   += rx_bytes;
1032                 tot->tx_bytes   += tx_bytes;
1033                 tot->tx_dropped += stats->tx_dropped;
1034         }
1035 }
1036
1037 static void netvsc_get_stats64(struct net_device *net,
1038                                struct rtnl_link_stats64 *t)
1039 {
1040         struct net_device_context *ndev_ctx = netdev_priv(net);
1041         struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev);
1042         struct netvsc_vf_pcpu_stats vf_tot;
1043         int i;
1044
1045         if (!nvdev)
1046                 return;
1047
1048         netdev_stats_to_stats64(t, &net->stats);
1049
1050         netvsc_get_vf_stats(net, &vf_tot);
1051         t->rx_packets += vf_tot.rx_packets;
1052         t->tx_packets += vf_tot.tx_packets;
1053         t->rx_bytes   += vf_tot.rx_bytes;
1054         t->tx_bytes   += vf_tot.tx_bytes;
1055         t->tx_dropped += vf_tot.tx_dropped;
1056
1057         for (i = 0; i < nvdev->num_chn; i++) {
1058                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1059                 const struct netvsc_stats *stats;
1060                 u64 packets, bytes, multicast;
1061                 unsigned int start;
1062
1063                 stats = &nvchan->tx_stats;
1064                 do {
1065                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1066                         packets = stats->packets;
1067                         bytes = stats->bytes;
1068                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1069
1070                 t->tx_bytes     += bytes;
1071                 t->tx_packets   += packets;
1072
1073                 stats = &nvchan->rx_stats;
1074                 do {
1075                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1076                         packets = stats->packets;
1077                         bytes = stats->bytes;
1078                         multicast = stats->multicast + stats->broadcast;
1079                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1080
1081                 t->rx_bytes     += bytes;
1082                 t->rx_packets   += packets;
1083                 t->multicast    += multicast;
1084         }
1085 }
1086
1087 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
1088 {
1089         struct net_device_context *ndc = netdev_priv(ndev);
1090         struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
1091         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1092         struct sockaddr *addr = p;
1093         int err;
1094
1095         err = eth_prepare_mac_addr_change(ndev, p);
1096         if (err)
1097                 return err;
1098
1099         if (!nvdev)
1100                 return -ENODEV;
1101
1102         if (vf_netdev) {
1103                 err = dev_set_mac_address(vf_netdev, addr);
1104                 if (err)
1105                         return err;
1106         }
1107
1108         err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
1109         if (!err) {
1110                 eth_commit_mac_addr_change(ndev, p);
1111         } else if (vf_netdev) {
1112                 /* rollback change on VF */
1113                 memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
1114                 dev_set_mac_address(vf_netdev, addr);
1115         }
1116
1117         return err;
1118 }
1119
1120 static const struct {
1121         char name[ETH_GSTRING_LEN];
1122         u16 offset;
1123 } netvsc_stats[] = {
1124         { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
1125         { "tx_no_memory",  offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
1126         { "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },
1127         { "tx_too_big",   offsetof(struct netvsc_ethtool_stats, tx_too_big) },
1128         { "tx_busy",      offsetof(struct netvsc_ethtool_stats, tx_busy) },
1129         { "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },
1130         { "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },
1131 }, vf_stats[] = {
1132         { "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },
1133         { "vf_rx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },
1134         { "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },
1135         { "vf_tx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },
1136         { "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },
1137 };
1138
1139 #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats)
1140 #define NETVSC_VF_STATS_LEN     ARRAY_SIZE(vf_stats)
1141
1142 /* 4 statistics per queue (rx/tx packets/bytes) */
1143 #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4)
1144
1145 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
1146 {
1147         struct net_device_context *ndc = netdev_priv(dev);
1148         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1149
1150         if (!nvdev)
1151                 return -ENODEV;
1152
1153         switch (string_set) {
1154         case ETH_SS_STATS:
1155                 return NETVSC_GLOBAL_STATS_LEN
1156                         + NETVSC_VF_STATS_LEN
1157                         + NETVSC_QUEUE_STATS_LEN(nvdev);
1158         default:
1159                 return -EINVAL;
1160         }
1161 }
1162
1163 static void netvsc_get_ethtool_stats(struct net_device *dev,
1164                                      struct ethtool_stats *stats, u64 *data)
1165 {
1166         struct net_device_context *ndc = netdev_priv(dev);
1167         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1168         const void *nds = &ndc->eth_stats;
1169         const struct netvsc_stats *qstats;
1170         struct netvsc_vf_pcpu_stats sum;
1171         unsigned int start;
1172         u64 packets, bytes;
1173         int i, j;
1174
1175         if (!nvdev)
1176                 return;
1177
1178         for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
1179                 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1180
1181         netvsc_get_vf_stats(dev, &sum);
1182         for (j = 0; j < NETVSC_VF_STATS_LEN; j++)
1183                 data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);
1184
1185         for (j = 0; j < nvdev->num_chn; j++) {
1186                 qstats = &nvdev->chan_table[j].tx_stats;
1187
1188                 do {
1189                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1190                         packets = qstats->packets;
1191                         bytes = qstats->bytes;
1192                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1193                 data[i++] = packets;
1194                 data[i++] = bytes;
1195
1196                 qstats = &nvdev->chan_table[j].rx_stats;
1197                 do {
1198                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1199                         packets = qstats->packets;
1200                         bytes = qstats->bytes;
1201                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1202                 data[i++] = packets;
1203                 data[i++] = bytes;
1204         }
1205 }
1206
1207 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1208 {
1209         struct net_device_context *ndc = netdev_priv(dev);
1210         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1211         u8 *p = data;
1212         int i;
1213
1214         if (!nvdev)
1215                 return;
1216
1217         switch (stringset) {
1218         case ETH_SS_STATS:
1219                 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) {
1220                         memcpy(p, netvsc_stats[i].name, ETH_GSTRING_LEN);
1221                         p += ETH_GSTRING_LEN;
1222                 }
1223
1224                 for (i = 0; i < ARRAY_SIZE(vf_stats); i++) {
1225                         memcpy(p, vf_stats[i].name, ETH_GSTRING_LEN);
1226                         p += ETH_GSTRING_LEN;
1227                 }
1228
1229                 for (i = 0; i < nvdev->num_chn; i++) {
1230                         sprintf(p, "tx_queue_%u_packets", i);
1231                         p += ETH_GSTRING_LEN;
1232                         sprintf(p, "tx_queue_%u_bytes", i);
1233                         p += ETH_GSTRING_LEN;
1234                         sprintf(p, "rx_queue_%u_packets", i);
1235                         p += ETH_GSTRING_LEN;
1236                         sprintf(p, "rx_queue_%u_bytes", i);
1237                         p += ETH_GSTRING_LEN;
1238                 }
1239
1240                 break;
1241         }
1242 }
1243
1244 static int
1245 netvsc_get_rss_hash_opts(struct net_device_context *ndc,
1246                          struct ethtool_rxnfc *info)
1247 {
1248         info->data = RXH_IP_SRC | RXH_IP_DST;
1249
1250         switch (info->flow_type) {
1251         case TCP_V4_FLOW:
1252         case TCP_V6_FLOW:
1253                 info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
1254                 break;
1255
1256         case UDP_V4_FLOW:
1257                 if (ndc->udp4_l4_hash)
1258                         info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
1259
1260                 break;
1261
1262         case UDP_V6_FLOW:
1263                 if (ndc->udp6_l4_hash)
1264                         info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
1265
1266                 break;
1267
1268         case IPV4_FLOW:
1269         case IPV6_FLOW:
1270                 break;
1271         default:
1272                 info->data = 0;
1273                 break;
1274         }
1275
1276         return 0;
1277 }
1278
1279 static int
1280 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1281                  u32 *rules)
1282 {
1283         struct net_device_context *ndc = netdev_priv(dev);
1284         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1285
1286         if (!nvdev)
1287                 return -ENODEV;
1288
1289         switch (info->cmd) {
1290         case ETHTOOL_GRXRINGS:
1291                 info->data = nvdev->num_chn;
1292                 return 0;
1293
1294         case ETHTOOL_GRXFH:
1295                 return netvsc_get_rss_hash_opts(ndc, info);
1296         }
1297         return -EOPNOTSUPP;
1298 }
1299
1300 static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
1301                                     struct ethtool_rxnfc *info)
1302 {
1303         if (info->data == (RXH_IP_SRC | RXH_IP_DST |
1304                            RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
1305                 if (info->flow_type == UDP_V4_FLOW)
1306                         ndc->udp4_l4_hash = true;
1307                 else if (info->flow_type == UDP_V6_FLOW)
1308                         ndc->udp6_l4_hash = true;
1309                 else
1310                         return -EOPNOTSUPP;
1311
1312                 return 0;
1313         }
1314
1315         if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {
1316                 if (info->flow_type == UDP_V4_FLOW)
1317                         ndc->udp4_l4_hash = false;
1318                 else if (info->flow_type == UDP_V6_FLOW)
1319                         ndc->udp6_l4_hash = false;
1320                 else
1321                         return -EOPNOTSUPP;
1322
1323                 return 0;
1324         }
1325
1326         return -EOPNOTSUPP;
1327 }
1328
1329 static int
1330 netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
1331 {
1332         struct net_device_context *ndc = netdev_priv(ndev);
1333
1334         if (info->cmd == ETHTOOL_SRXFH)
1335                 return netvsc_set_rss_hash_opts(ndc, info);
1336
1337         return -EOPNOTSUPP;
1338 }
1339
1340 #ifdef CONFIG_NET_POLL_CONTROLLER
1341 static void netvsc_poll_controller(struct net_device *dev)
1342 {
1343         struct net_device_context *ndc = netdev_priv(dev);
1344         struct netvsc_device *ndev;
1345         int i;
1346
1347         rcu_read_lock();
1348         ndev = rcu_dereference(ndc->nvdev);
1349         if (ndev) {
1350                 for (i = 0; i < ndev->num_chn; i++) {
1351                         struct netvsc_channel *nvchan = &ndev->chan_table[i];
1352
1353                         napi_schedule(&nvchan->napi);
1354                 }
1355         }
1356         rcu_read_unlock();
1357 }
1358 #endif
1359
1360 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1361 {
1362         return NETVSC_HASH_KEYLEN;
1363 }
1364
1365 static u32 netvsc_rss_indir_size(struct net_device *dev)
1366 {
1367         return ITAB_NUM;
1368 }
1369
1370 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1371                            u8 *hfunc)
1372 {
1373         struct net_device_context *ndc = netdev_priv(dev);
1374         struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1375         struct rndis_device *rndis_dev;
1376         int i;
1377
1378         if (!ndev)
1379                 return -ENODEV;
1380
1381         if (hfunc)
1382                 *hfunc = ETH_RSS_HASH_TOP;      /* Toeplitz */
1383
1384         rndis_dev = ndev->extension;
1385         if (indir) {
1386                 for (i = 0; i < ITAB_NUM; i++)
1387                         indir[i] = rndis_dev->ind_table[i];
1388         }
1389
1390         if (key)
1391                 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1392
1393         return 0;
1394 }
1395
1396 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1397                            const u8 *key, const u8 hfunc)
1398 {
1399         struct net_device_context *ndc = netdev_priv(dev);
1400         struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1401         struct rndis_device *rndis_dev;
1402         int i;
1403
1404         if (!ndev)
1405                 return -ENODEV;
1406
1407         if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1408                 return -EOPNOTSUPP;
1409
1410         rndis_dev = ndev->extension;
1411         if (indir) {
1412                 for (i = 0; i < ITAB_NUM; i++)
1413                         if (indir[i] >= VRSS_CHANNEL_MAX)
1414                                 return -EINVAL;
1415
1416                 for (i = 0; i < ITAB_NUM; i++)
1417                         rndis_dev->ind_table[i] = indir[i];
1418         }
1419
1420         if (!key) {
1421                 if (!indir)
1422                         return 0;
1423
1424                 key = rndis_dev->rss_key;
1425         }
1426
1427         return rndis_filter_set_rss_param(rndis_dev, key, ndev->num_chn);
1428 }
1429
1430 /* Hyper-V RNDIS protocol does not have ring in the HW sense.
1431  * It does have pre-allocated receive area which is divided into sections.
1432  */
1433 static void __netvsc_get_ringparam(struct netvsc_device *nvdev,
1434                                    struct ethtool_ringparam *ring)
1435 {
1436         u32 max_buf_size;
1437
1438         ring->rx_pending = nvdev->recv_section_cnt;
1439         ring->tx_pending = nvdev->send_section_cnt;
1440
1441         if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
1442                 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
1443         else
1444                 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
1445
1446         ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;
1447         ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE
1448                 / nvdev->send_section_size;
1449 }
1450
1451 static void netvsc_get_ringparam(struct net_device *ndev,
1452                                  struct ethtool_ringparam *ring)
1453 {
1454         struct net_device_context *ndevctx = netdev_priv(ndev);
1455         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1456
1457         if (!nvdev)
1458                 return;
1459
1460         __netvsc_get_ringparam(nvdev, ring);
1461 }
1462
1463 static int netvsc_set_ringparam(struct net_device *ndev,
1464                                 struct ethtool_ringparam *ring)
1465 {
1466         struct net_device_context *ndevctx = netdev_priv(ndev);
1467         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1468         struct hv_device *hdev = ndevctx->device_ctx;
1469         struct netvsc_device_info device_info;
1470         struct ethtool_ringparam orig;
1471         u32 new_tx, new_rx;
1472         bool was_opened;
1473         int ret = 0;
1474
1475         if (!nvdev || nvdev->destroy)
1476                 return -ENODEV;
1477
1478         memset(&orig, 0, sizeof(orig));
1479         __netvsc_get_ringparam(nvdev, &orig);
1480
1481         new_tx = clamp_t(u32, ring->tx_pending,
1482                          NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);
1483         new_rx = clamp_t(u32, ring->rx_pending,
1484                          NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);
1485
1486         if (new_tx == orig.tx_pending &&
1487             new_rx == orig.rx_pending)
1488                 return 0;        /* no change */
1489
1490         memset(&device_info, 0, sizeof(device_info));
1491         device_info.num_chn = nvdev->num_chn;
1492         device_info.ring_size = ring_size;
1493         device_info.send_sections = new_tx;
1494         device_info.recv_sections = new_rx;
1495
1496         netif_device_detach(ndev);
1497         was_opened = rndis_filter_opened(nvdev);
1498         if (was_opened)
1499                 rndis_filter_close(nvdev);
1500
1501         rndis_filter_device_remove(hdev, nvdev);
1502
1503         nvdev = rndis_filter_device_add(hdev, &device_info);
1504         if (IS_ERR(nvdev)) {
1505                 ret = PTR_ERR(nvdev);
1506
1507                 device_info.send_sections = orig.tx_pending;
1508                 device_info.recv_sections = orig.rx_pending;
1509                 nvdev = rndis_filter_device_add(hdev, &device_info);
1510                 if (IS_ERR(nvdev)) {
1511                         netdev_err(ndev, "restoring ringparam failed: %ld\n",
1512                                    PTR_ERR(nvdev));
1513                         return ret;
1514                 }
1515         }
1516
1517         if (was_opened)
1518                 rndis_filter_open(nvdev);
1519         netif_device_attach(ndev);
1520
1521         /* We may have missed link change notifications */
1522         ndevctx->last_reconfig = 0;
1523         schedule_delayed_work(&ndevctx->dwork, 0);
1524
1525         return ret;
1526 }
1527
1528 static const struct ethtool_ops ethtool_ops = {
1529         .get_drvinfo    = netvsc_get_drvinfo,
1530         .get_link       = ethtool_op_get_link,
1531         .get_ethtool_stats = netvsc_get_ethtool_stats,
1532         .get_sset_count = netvsc_get_sset_count,
1533         .get_strings    = netvsc_get_strings,
1534         .get_channels   = netvsc_get_channels,
1535         .set_channels   = netvsc_set_channels,
1536         .get_ts_info    = ethtool_op_get_ts_info,
1537         .get_rxnfc      = netvsc_get_rxnfc,
1538         .set_rxnfc      = netvsc_set_rxnfc,
1539         .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1540         .get_rxfh_indir_size = netvsc_rss_indir_size,
1541         .get_rxfh       = netvsc_get_rxfh,
1542         .set_rxfh       = netvsc_set_rxfh,
1543         .get_link_ksettings = netvsc_get_link_ksettings,
1544         .set_link_ksettings = netvsc_set_link_ksettings,
1545         .get_ringparam  = netvsc_get_ringparam,
1546         .set_ringparam  = netvsc_set_ringparam,
1547 };
1548
1549 static const struct net_device_ops device_ops = {
1550         .ndo_open =                     netvsc_open,
1551         .ndo_stop =                     netvsc_close,
1552         .ndo_start_xmit =               netvsc_start_xmit,
1553         .ndo_set_rx_mode =              netvsc_set_multicast_list,
1554         .ndo_change_mtu =               netvsc_change_mtu,
1555         .ndo_validate_addr =            eth_validate_addr,
1556         .ndo_set_mac_address =          netvsc_set_mac_addr,
1557         .ndo_select_queue =             netvsc_select_queue,
1558         .ndo_get_stats64 =              netvsc_get_stats64,
1559 #ifdef CONFIG_NET_POLL_CONTROLLER
1560         .ndo_poll_controller =          netvsc_poll_controller,
1561 #endif
1562 };
1563
1564 /*
1565  * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1566  * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1567  * present send GARP packet to network peers with netif_notify_peers().
1568  */
1569 static void netvsc_link_change(struct work_struct *w)
1570 {
1571         struct net_device_context *ndev_ctx =
1572                 container_of(w, struct net_device_context, dwork.work);
1573         struct hv_device *device_obj = ndev_ctx->device_ctx;
1574         struct net_device *net = hv_get_drvdata(device_obj);
1575         struct netvsc_device *net_device;
1576         struct rndis_device *rdev;
1577         struct netvsc_reconfig *event = NULL;
1578         bool notify = false, reschedule = false;
1579         unsigned long flags, next_reconfig, delay;
1580
1581         /* if changes are happening, comeback later */
1582         if (!rtnl_trylock()) {
1583                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1584                 return;
1585         }
1586
1587         net_device = rtnl_dereference(ndev_ctx->nvdev);
1588         if (!net_device)
1589                 goto out_unlock;
1590
1591         rdev = net_device->extension;
1592
1593         next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1594         if (time_is_after_jiffies(next_reconfig)) {
1595                 /* link_watch only sends one notification with current state
1596                  * per second, avoid doing reconfig more frequently. Handle
1597                  * wrap around.
1598                  */
1599                 delay = next_reconfig - jiffies;
1600                 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1601                 schedule_delayed_work(&ndev_ctx->dwork, delay);
1602                 goto out_unlock;
1603         }
1604         ndev_ctx->last_reconfig = jiffies;
1605
1606         spin_lock_irqsave(&ndev_ctx->lock, flags);
1607         if (!list_empty(&ndev_ctx->reconfig_events)) {
1608                 event = list_first_entry(&ndev_ctx->reconfig_events,
1609                                          struct netvsc_reconfig, list);
1610                 list_del(&event->list);
1611                 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1612         }
1613         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1614
1615         if (!event)
1616                 goto out_unlock;
1617
1618         switch (event->event) {
1619                 /* Only the following events are possible due to the check in
1620                  * netvsc_linkstatus_callback()
1621                  */
1622         case RNDIS_STATUS_MEDIA_CONNECT:
1623                 if (rdev->link_state) {
1624                         rdev->link_state = false;
1625                         netif_carrier_on(net);
1626                         netif_tx_wake_all_queues(net);
1627                 } else {
1628                         notify = true;
1629                 }
1630                 kfree(event);
1631                 break;
1632         case RNDIS_STATUS_MEDIA_DISCONNECT:
1633                 if (!rdev->link_state) {
1634                         rdev->link_state = true;
1635                         netif_carrier_off(net);
1636                         netif_tx_stop_all_queues(net);
1637                 }
1638                 kfree(event);
1639                 break;
1640         case RNDIS_STATUS_NETWORK_CHANGE:
1641                 /* Only makes sense if carrier is present */
1642                 if (!rdev->link_state) {
1643                         rdev->link_state = true;
1644                         netif_carrier_off(net);
1645                         netif_tx_stop_all_queues(net);
1646                         event->event = RNDIS_STATUS_MEDIA_CONNECT;
1647                         spin_lock_irqsave(&ndev_ctx->lock, flags);
1648                         list_add(&event->list, &ndev_ctx->reconfig_events);
1649                         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1650                         reschedule = true;
1651                 }
1652                 break;
1653         }
1654
1655         rtnl_unlock();
1656
1657         if (notify)
1658                 netdev_notify_peers(net);
1659
1660         /* link_watch only sends one notification with current state per
1661          * second, handle next reconfig event in 2 seconds.
1662          */
1663         if (reschedule)
1664                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1665
1666         return;
1667
1668 out_unlock:
1669         rtnl_unlock();
1670 }
1671
1672 static struct net_device *get_netvsc_bymac(const u8 *mac)
1673 {
1674         struct net_device *dev;
1675
1676         ASSERT_RTNL();
1677
1678         for_each_netdev(&init_net, dev) {
1679                 if (dev->netdev_ops != &device_ops)
1680                         continue;       /* not a netvsc device */
1681
1682                 if (ether_addr_equal(mac, dev->perm_addr))
1683                         return dev;
1684         }
1685
1686         return NULL;
1687 }
1688
1689 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1690 {
1691         struct net_device *dev;
1692
1693         ASSERT_RTNL();
1694
1695         for_each_netdev(&init_net, dev) {
1696                 struct net_device_context *net_device_ctx;
1697
1698                 if (dev->netdev_ops != &device_ops)
1699                         continue;       /* not a netvsc device */
1700
1701                 net_device_ctx = netdev_priv(dev);
1702                 if (!rtnl_dereference(net_device_ctx->nvdev))
1703                         continue;       /* device is removed */
1704
1705                 if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev)
1706                         return dev;     /* a match */
1707         }
1708
1709         return NULL;
1710 }
1711
1712 /* Called when VF is injecting data into network stack.
1713  * Change the associated network device from VF to netvsc.
1714  * note: already called with rcu_read_lock
1715  */
1716 static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
1717 {
1718         struct sk_buff *skb = *pskb;
1719         struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);
1720         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1721         struct netvsc_vf_pcpu_stats *pcpu_stats
1722                  = this_cpu_ptr(ndev_ctx->vf_stats);
1723
1724         skb->dev = ndev;
1725
1726         u64_stats_update_begin(&pcpu_stats->syncp);
1727         pcpu_stats->rx_packets++;
1728         pcpu_stats->rx_bytes += skb->len;
1729         u64_stats_update_end(&pcpu_stats->syncp);
1730
1731         return RX_HANDLER_ANOTHER;
1732 }
1733
1734 static int netvsc_vf_join(struct net_device *vf_netdev,
1735                           struct net_device *ndev)
1736 {
1737         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1738         int ret;
1739
1740         ret = netdev_rx_handler_register(vf_netdev,
1741                                          netvsc_vf_handle_frame, ndev);
1742         if (ret != 0) {
1743                 netdev_err(vf_netdev,
1744                            "can not register netvsc VF receive handler (err = %d)\n",
1745                            ret);
1746                 goto rx_handler_failed;
1747         }
1748
1749         ret = netdev_upper_dev_link(vf_netdev, ndev);
1750         if (ret != 0) {
1751                 netdev_err(vf_netdev,
1752                            "can not set master device %s (err = %d)\n",
1753                            ndev->name, ret);
1754                 goto upper_link_failed;
1755         }
1756
1757         /* set slave flag before open to prevent IPv6 addrconf */
1758         vf_netdev->flags |= IFF_SLAVE;
1759
1760         schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
1761
1762         call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
1763
1764         netdev_info(vf_netdev, "joined to %s\n", ndev->name);
1765         return 0;
1766
1767 upper_link_failed:
1768         netdev_rx_handler_unregister(vf_netdev);
1769 rx_handler_failed:
1770         return ret;
1771 }
1772
1773 static void __netvsc_vf_setup(struct net_device *ndev,
1774                               struct net_device *vf_netdev)
1775 {
1776         int ret;
1777
1778         /* Align MTU of VF with master */
1779         ret = dev_set_mtu(vf_netdev, ndev->mtu);
1780         if (ret)
1781                 netdev_warn(vf_netdev,
1782                             "unable to change mtu to %u\n", ndev->mtu);
1783
1784         if (netif_running(ndev)) {
1785                 ret = dev_open(vf_netdev);
1786                 if (ret)
1787                         netdev_warn(vf_netdev,
1788                                     "unable to open: %d\n", ret);
1789         }
1790 }
1791
1792 /* Setup VF as slave of the synthetic device.
1793  * Runs in workqueue to avoid recursion in netlink callbacks.
1794  */
1795 static void netvsc_vf_setup(struct work_struct *w)
1796 {
1797         struct net_device_context *ndev_ctx
1798                 = container_of(w, struct net_device_context, vf_takeover.work);
1799         struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
1800         struct net_device *vf_netdev;
1801
1802         if (!rtnl_trylock()) {
1803                 schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
1804                 return;
1805         }
1806
1807         vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
1808         if (vf_netdev)
1809                 __netvsc_vf_setup(ndev, vf_netdev);
1810
1811         rtnl_unlock();
1812 }
1813
1814 static int netvsc_register_vf(struct net_device *vf_netdev)
1815 {
1816         struct net_device *ndev;
1817         struct net_device_context *net_device_ctx;
1818         struct netvsc_device *netvsc_dev;
1819
1820         if (vf_netdev->addr_len != ETH_ALEN)
1821                 return NOTIFY_DONE;
1822
1823         /*
1824          * We will use the MAC address to locate the synthetic interface to
1825          * associate with the VF interface. If we don't find a matching
1826          * synthetic interface, move on.
1827          */
1828         ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1829         if (!ndev)
1830                 return NOTIFY_DONE;
1831
1832         net_device_ctx = netdev_priv(ndev);
1833         netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1834         if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1835                 return NOTIFY_DONE;
1836
1837         if (netvsc_vf_join(vf_netdev, ndev) != 0)
1838                 return NOTIFY_DONE;
1839
1840         netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1841
1842         /* Prevent this module from being unloaded while VF is registered */
1843         try_module_get(THIS_MODULE);
1844
1845         dev_hold(vf_netdev);
1846         rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1847         return NOTIFY_OK;
1848 }
1849
1850 static int netvsc_vf_up(struct net_device *vf_netdev)
1851 {
1852         struct net_device_context *net_device_ctx;
1853         struct netvsc_device *netvsc_dev;
1854         struct net_device *ndev;
1855
1856         ndev = get_netvsc_byref(vf_netdev);
1857         if (!ndev)
1858                 return NOTIFY_DONE;
1859
1860         net_device_ctx = netdev_priv(ndev);
1861         netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1862         if (!netvsc_dev)
1863                 return NOTIFY_DONE;
1864
1865         /* Bump refcount when datapath is acvive - Why? */
1866         rndis_filter_open(netvsc_dev);
1867
1868         /* notify the host to switch the data path. */
1869         netvsc_switch_datapath(ndev, true);
1870         netdev_info(ndev, "Data path switched to VF: %s\n", vf_netdev->name);
1871
1872         return NOTIFY_OK;
1873 }
1874
1875 static int netvsc_vf_down(struct net_device *vf_netdev)
1876 {
1877         struct net_device_context *net_device_ctx;
1878         struct netvsc_device *netvsc_dev;
1879         struct net_device *ndev;
1880
1881         ndev = get_netvsc_byref(vf_netdev);
1882         if (!ndev)
1883                 return NOTIFY_DONE;
1884
1885         net_device_ctx = netdev_priv(ndev);
1886         netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1887         if (!netvsc_dev)
1888                 return NOTIFY_DONE;
1889
1890         netvsc_switch_datapath(ndev, false);
1891         netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
1892         rndis_filter_close(netvsc_dev);
1893
1894         return NOTIFY_OK;
1895 }
1896
1897 static int netvsc_unregister_vf(struct net_device *vf_netdev)
1898 {
1899         struct net_device *ndev;
1900         struct net_device_context *net_device_ctx;
1901
1902         ndev = get_netvsc_byref(vf_netdev);
1903         if (!ndev)
1904                 return NOTIFY_DONE;
1905
1906         net_device_ctx = netdev_priv(ndev);
1907         cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
1908
1909         netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
1910
1911         netdev_upper_dev_unlink(vf_netdev, ndev);
1912         RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
1913         dev_put(vf_netdev);
1914         module_put(THIS_MODULE);
1915         return NOTIFY_OK;
1916 }
1917
1918 static int netvsc_probe(struct hv_device *dev,
1919                         const struct hv_vmbus_device_id *dev_id)
1920 {
1921         struct net_device *net = NULL;
1922         struct net_device_context *net_device_ctx;
1923         struct netvsc_device_info device_info;
1924         struct netvsc_device *nvdev;
1925         int ret = -ENOMEM;
1926
1927         net = alloc_etherdev_mq(sizeof(struct net_device_context),
1928                                 VRSS_CHANNEL_MAX);
1929         if (!net)
1930                 goto no_net;
1931
1932         netif_carrier_off(net);
1933
1934         netvsc_init_settings(net);
1935
1936         net_device_ctx = netdev_priv(net);
1937         net_device_ctx->device_ctx = dev;
1938         net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1939         if (netif_msg_probe(net_device_ctx))
1940                 netdev_dbg(net, "netvsc msg_enable: %d\n",
1941                            net_device_ctx->msg_enable);
1942
1943         hv_set_drvdata(dev, net);
1944
1945         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1946
1947         spin_lock_init(&net_device_ctx->lock);
1948         INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1949         INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
1950
1951         net_device_ctx->vf_stats
1952                 = netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
1953         if (!net_device_ctx->vf_stats)
1954                 goto no_stats;
1955
1956         net->netdev_ops = &device_ops;
1957         net->ethtool_ops = &ethtool_ops;
1958         SET_NETDEV_DEV(net, &dev->device);
1959
1960         /* We always need headroom for rndis header */
1961         net->needed_headroom = RNDIS_AND_PPI_SIZE;
1962
1963         /* Notify the netvsc driver of the new device */
1964         memset(&device_info, 0, sizeof(device_info));
1965         device_info.ring_size = ring_size;
1966         device_info.num_chn = VRSS_CHANNEL_DEFAULT;
1967         device_info.send_sections = NETVSC_DEFAULT_TX;
1968         device_info.recv_sections = NETVSC_DEFAULT_RX;
1969
1970         nvdev = rndis_filter_device_add(dev, &device_info);
1971         if (IS_ERR(nvdev)) {
1972                 ret = PTR_ERR(nvdev);
1973                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1974                 goto rndis_failed;
1975         }
1976
1977         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1978
1979         /* hw_features computed in rndis_filter_device_add */
1980         net->features = net->hw_features |
1981                 NETIF_F_HIGHDMA | NETIF_F_SG |
1982                 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
1983         net->vlan_features = net->features;
1984
1985         netif_set_real_num_tx_queues(net, nvdev->num_chn);
1986         netif_set_real_num_rx_queues(net, nvdev->num_chn);
1987
1988         netdev_lockdep_set_classes(net);
1989
1990         /* MTU range: 68 - 1500 or 65521 */
1991         net->min_mtu = NETVSC_MTU_MIN;
1992         if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
1993                 net->max_mtu = NETVSC_MTU - ETH_HLEN;
1994         else
1995                 net->max_mtu = ETH_DATA_LEN;
1996
1997         ret = register_netdev(net);
1998         if (ret != 0) {
1999                 pr_err("Unable to register netdev.\n");
2000                 goto register_failed;
2001         }
2002
2003         return ret;
2004
2005 register_failed:
2006         rndis_filter_device_remove(dev, nvdev);
2007 rndis_failed:
2008         free_percpu(net_device_ctx->vf_stats);
2009 no_stats:
2010         hv_set_drvdata(dev, NULL);
2011         free_netdev(net);
2012 no_net:
2013         return ret;
2014 }
2015
2016 static int netvsc_remove(struct hv_device *dev)
2017 {
2018         struct net_device *net;
2019         struct net_device_context *ndev_ctx;
2020
2021         net = hv_get_drvdata(dev);
2022
2023         if (net == NULL) {
2024                 dev_err(&dev->device, "No net device to remove\n");
2025                 return 0;
2026         }
2027
2028         ndev_ctx = netdev_priv(net);
2029
2030         netif_device_detach(net);
2031
2032         cancel_delayed_work_sync(&ndev_ctx->dwork);
2033
2034         /*
2035          * Call to the vsc driver to let it know that the device is being
2036          * removed. Also blocks mtu and channel changes.
2037          */
2038         rtnl_lock();
2039         rndis_filter_device_remove(dev,
2040                                    rtnl_dereference(ndev_ctx->nvdev));
2041         rtnl_unlock();
2042
2043         unregister_netdev(net);
2044
2045         hv_set_drvdata(dev, NULL);
2046
2047         free_percpu(ndev_ctx->vf_stats);
2048         free_netdev(net);
2049         return 0;
2050 }
2051
2052 static const struct hv_vmbus_device_id id_table[] = {
2053         /* Network guid */
2054         { HV_NIC_GUID, },
2055         { },
2056 };
2057
2058 MODULE_DEVICE_TABLE(vmbus, id_table);
2059
2060 /* The one and only one */
2061 static struct  hv_driver netvsc_drv = {
2062         .name = KBUILD_MODNAME,
2063         .id_table = id_table,
2064         .probe = netvsc_probe,
2065         .remove = netvsc_remove,
2066 };
2067
2068 /*
2069  * On Hyper-V, every VF interface is matched with a corresponding
2070  * synthetic interface. The synthetic interface is presented first
2071  * to the guest. When the corresponding VF instance is registered,
2072  * we will take care of switching the data path.
2073  */
2074 static int netvsc_netdev_event(struct notifier_block *this,
2075                                unsigned long event, void *ptr)
2076 {
2077         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2078
2079         /* Skip our own events */
2080         if (event_dev->netdev_ops == &device_ops)
2081                 return NOTIFY_DONE;
2082
2083         /* Avoid non-Ethernet type devices */
2084         if (event_dev->type != ARPHRD_ETHER)
2085                 return NOTIFY_DONE;
2086
2087         /* Avoid Vlan dev with same MAC registering as VF */
2088         if (is_vlan_dev(event_dev))
2089                 return NOTIFY_DONE;
2090
2091         /* Avoid Bonding master dev with same MAC registering as VF */
2092         if ((event_dev->priv_flags & IFF_BONDING) &&
2093             (event_dev->flags & IFF_MASTER))
2094                 return NOTIFY_DONE;
2095
2096         switch (event) {
2097         case NETDEV_REGISTER:
2098                 return netvsc_register_vf(event_dev);
2099         case NETDEV_UNREGISTER:
2100                 return netvsc_unregister_vf(event_dev);
2101         case NETDEV_UP:
2102                 return netvsc_vf_up(event_dev);
2103         case NETDEV_DOWN:
2104                 return netvsc_vf_down(event_dev);
2105         default:
2106                 return NOTIFY_DONE;
2107         }
2108 }
2109
2110 static struct notifier_block netvsc_netdev_notifier = {
2111         .notifier_call = netvsc_netdev_event,
2112 };
2113
2114 static void __exit netvsc_drv_exit(void)
2115 {
2116         unregister_netdevice_notifier(&netvsc_netdev_notifier);
2117         vmbus_driver_unregister(&netvsc_drv);
2118 }
2119
2120 static int __init netvsc_drv_init(void)
2121 {
2122         int ret;
2123
2124         if (ring_size < RING_SIZE_MIN) {
2125                 ring_size = RING_SIZE_MIN;
2126                 pr_info("Increased ring_size to %d (min allowed)\n",
2127                         ring_size);
2128         }
2129         ret = vmbus_driver_register(&netvsc_drv);
2130
2131         if (ret)
2132                 return ret;
2133
2134         register_netdevice_notifier(&netvsc_netdev_notifier);
2135         return 0;
2136 }
2137
2138 MODULE_LICENSE("GPL");
2139 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
2140
2141 module_init(netvsc_drv_init);
2142 module_exit(netvsc_drv_exit);