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       10485   /* Max ~16M */
  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, pkt_proto = 0;
 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         switch (flow.basic.ip_proto) {
 215         case IPPROTO_TCP:
 216                 if (flow.basic.n_proto == htons(ETH_P_IP))
 217                         pkt_proto = HV_TCP4_L4HASH;
 218                 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
 219                         pkt_proto = HV_TCP6_L4HASH;
 220
 221                 break;
 222
 223         case IPPROTO_UDP:
 224                 if (flow.basic.n_proto == htons(ETH_P_IP))
 225                         pkt_proto = HV_UDP4_L4HASH;
 226                 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
 227                         pkt_proto = HV_UDP6_L4HASH;
 228
 229                 break;
 230         }
 231
 232         if (pkt_proto & ndc->l4_hash) {
 233                 return skb_get_hash(skb);
 234         } else {
 235                 if (flow.basic.n_proto == htons(ETH_P_IP))
 236                         hash = jhash2((u32 *)&flow.addrs.v4addrs, 2, hashrnd);
 237                 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
 238                         hash = jhash2((u32 *)&flow.addrs.v6addrs, 8, hashrnd);
 239                 else
 240                         hash = 0;
 241
 242                 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3);
 243         }
 244
 245         return hash;
 246 }
 247
 248 static inline int netvsc_get_tx_queue(struct net_device *ndev,
 249                                       struct sk_buff *skb, int old_idx)
 250 {
 251         const struct net_device_context *ndc = netdev_priv(ndev);
 252         struct sock *sk = skb->sk;
 253         int q_idx;
 254
 255         q_idx = ndc->tx_table[netvsc_get_hash(skb, ndc) &
 256                               (VRSS_SEND_TAB_SIZE - 1)];
 257
 258         /* If queue index changed record the new value */
 259         if (q_idx != old_idx &&
 260             sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
 261                 sk_tx_queue_set(sk, q_idx);
 262
 263         return q_idx;
 264 }
 265
 266 /*
 267  * Select queue for transmit.
 268  *
 269  * If a valid queue has already been assigned, then use that.
 270  * Otherwise compute tx queue based on hash and the send table.
 271  *
 272  * This is basically similar to default (__netdev_pick_tx) with the added step
 273  * of using the host send_table when no other queue has been assigned.
 274  *
 275  * TODO support XPS - but get_xps_queue not exported
 276  */
 277 static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)
 278 {
 279         int q_idx = sk_tx_queue_get(skb->sk);
 280
 281         if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {
 282                 /* If forwarding a packet, we use the recorded queue when
 283                  * available for better cache locality.
 284                  */
 285                 if (skb_rx_queue_recorded(skb))
 286                         q_idx = skb_get_rx_queue(skb);
 287                 else
 288                         q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);
 289         }
 290
 291         return q_idx;
 292 }
 293
 294 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
 295                                void *accel_priv,
 296                                select_queue_fallback_t fallback)
 297 {
 298         struct net_device_context *ndc = netdev_priv(ndev);
 299         struct net_device *vf_netdev;
 300         u16 txq;
 301
 302         rcu_read_lock();
 303         vf_netdev = rcu_dereference(ndc->vf_netdev);
 304         if (vf_netdev) {
 305                 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
 306                 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
 307         } else {
 308                 txq = netvsc_pick_tx(ndev, skb);
 309         }
 310         rcu_read_unlock();
 311
 312         while (unlikely(txq >= ndev->real_num_tx_queues))
 313                 txq -= ndev->real_num_tx_queues;
 314
 315         return txq;
 316 }
 317
 318 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
 319                        struct hv_page_buffer *pb)
 320 {
 321         int j = 0;
 322
 323         /* Deal with compund pages by ignoring unused part
 324          * of the page.
 325          */
 326         page += (offset >> PAGE_SHIFT);
 327         offset &= ~PAGE_MASK;
 328
 329         while (len > 0) {
 330                 unsigned long bytes;
 331
 332                 bytes = PAGE_SIZE - offset;
 333                 if (bytes > len)
 334                         bytes = len;
 335                 pb[j].pfn = page_to_pfn(page);
 336                 pb[j].offset = offset;
 337                 pb[j].len = bytes;
 338
 339                 offset += bytes;
 340                 len -= bytes;
 341
 342                 if (offset == PAGE_SIZE && len) {
 343                         page++;
 344                         offset = 0;
 345                         j++;
 346                 }
 347         }
 348
 349         return j + 1;
 350 }
 351
 352 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
 353                            struct hv_netvsc_packet *packet,
 354                            struct hv_page_buffer *pb)
 355 {
 356         u32 slots_used = 0;
 357         char *data = skb->data;
 358         int frags = skb_shinfo(skb)->nr_frags;
 359         int i;
 360
 361         /* The packet is laid out thus:
 362          * 1. hdr: RNDIS header and PPI
 363          * 2. skb linear data
 364          * 3. skb fragment data
 365          */
 366         slots_used += fill_pg_buf(virt_to_page(hdr),
 367                                   offset_in_page(hdr),
 368                                   len, &pb[slots_used]);
 369
 370         packet->rmsg_size = len;
 371         packet->rmsg_pgcnt = slots_used;
 372
 373         slots_used += fill_pg_buf(virt_to_page(data),
 374                                 offset_in_page(data),
 375                                 skb_headlen(skb), &pb[slots_used]);
 376
 377         for (i = 0; i < frags; i++) {
 378                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 379
 380                 slots_used += fill_pg_buf(skb_frag_page(frag),
 381                                         frag->page_offset,
 382                                         skb_frag_size(frag), &pb[slots_used]);
 383         }
 384         return slots_used;
 385 }
 386
 387 static int count_skb_frag_slots(struct sk_buff *skb)
 388 {
 389         int i, frags = skb_shinfo(skb)->nr_frags;
 390         int pages = 0;
 391
 392         for (i = 0; i < frags; i++) {
 393                 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
 394                 unsigned long size = skb_frag_size(frag);
 395                 unsigned long offset = frag->page_offset;
 396
 397                 /* Skip unused frames from start of page */
 398                 offset &= ~PAGE_MASK;
 399                 pages += PFN_UP(offset + size);
 400         }
 401         return pages;
 402 }
 403
 404 static int netvsc_get_slots(struct sk_buff *skb)
 405 {
 406         char *data = skb->data;
 407         unsigned int offset = offset_in_page(data);
 408         unsigned int len = skb_headlen(skb);
 409         int slots;
 410         int frag_slots;
 411
 412         slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
 413         frag_slots = count_skb_frag_slots(skb);
 414         return slots + frag_slots;
 415 }
 416
 417 static u32 net_checksum_info(struct sk_buff *skb)
 418 {
 419         if (skb->protocol == htons(ETH_P_IP)) {
 420                 struct iphdr *ip = ip_hdr(skb);
 421
 422                 if (ip->protocol == IPPROTO_TCP)
 423                         return TRANSPORT_INFO_IPV4_TCP;
 424                 else if (ip->protocol == IPPROTO_UDP)
 425                         return TRANSPORT_INFO_IPV4_UDP;
 426         } else {
 427                 struct ipv6hdr *ip6 = ipv6_hdr(skb);
 428
 429                 if (ip6->nexthdr == IPPROTO_TCP)
 430                         return TRANSPORT_INFO_IPV6_TCP;
 431                 else if (ip6->nexthdr == IPPROTO_UDP)
 432                         return TRANSPORT_INFO_IPV6_UDP;
 433         }
 434
 435         return TRANSPORT_INFO_NOT_IP;
 436 }
 437
 438 /* Send skb on the slave VF device. */
 439 static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
 440                           struct sk_buff *skb)
 441 {
 442         struct net_device_context *ndev_ctx = netdev_priv(net);
 443         unsigned int len = skb->len;
 444         int rc;
 445
 446         skb->dev = vf_netdev;
 447         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 448
 449         rc = dev_queue_xmit(skb);
 450         if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {
 451                 struct netvsc_vf_pcpu_stats *pcpu_stats
 452                         = this_cpu_ptr(ndev_ctx->vf_stats);
 453
 454                 u64_stats_update_begin(&pcpu_stats->syncp);
 455                 pcpu_stats->tx_packets++;
 456                 pcpu_stats->tx_bytes += len;
 457                 u64_stats_update_end(&pcpu_stats->syncp);
 458         } else {
 459                 this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);
 460         }
 461
 462         return rc;
 463 }
 464
 465 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 466 {
 467         struct net_device_context *net_device_ctx = netdev_priv(net);
 468         struct hv_netvsc_packet *packet = NULL;
 469         int ret;
 470         unsigned int num_data_pgs;
 471         struct rndis_message *rndis_msg;
 472         struct rndis_packet *rndis_pkt;
 473         struct net_device *vf_netdev;
 474         u32 rndis_msg_size;
 475         struct rndis_per_packet_info *ppi;
 476         u32 hash;
 477         struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
 478
 479         /* if VF is present and up then redirect packets
 480          * already called with rcu_read_lock_bh
 481          */
 482         vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
 483         if (vf_netdev && netif_running(vf_netdev) &&
 484             !netpoll_tx_running(net))
 485                 return netvsc_vf_xmit(net, vf_netdev, skb);
 486
 487         /* We will atmost need two pages to describe the rndis
 488          * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
 489          * of pages in a single packet. If skb is scattered around
 490          * more pages we try linearizing it.
 491          */
 492
 493         num_data_pgs = netvsc_get_slots(skb) + 2;
 494
 495         if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
 496                 ++net_device_ctx->eth_stats.tx_scattered;
 497
 498                 if (skb_linearize(skb))
 499                         goto no_memory;
 500
 501                 num_data_pgs = netvsc_get_slots(skb) + 2;
 502                 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
 503                         ++net_device_ctx->eth_stats.tx_too_big;
 504                         goto drop;
 505                 }
 506         }
 507
 508         /*
 509          * Place the rndis header in the skb head room and
 510          * the skb->cb will be used for hv_netvsc_packet
 511          * structure.
 512          */
 513         ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
 514         if (ret)
 515                 goto no_memory;
 516
 517         /* Use the skb control buffer for building up the packet */
 518         BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
 519                         FIELD_SIZEOF(struct sk_buff, cb));
 520         packet = (struct hv_netvsc_packet *)skb->cb;
 521
 522         packet->q_idx = skb_get_queue_mapping(skb);
 523
 524         packet->total_data_buflen = skb->len;
 525         packet->total_bytes = skb->len;
 526         packet->total_packets = 1;
 527
 528         rndis_msg = (struct rndis_message *)skb->head;
 529
 530         memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
 531
 532         /* Add the rndis header */
 533         rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
 534         rndis_msg->msg_len = packet->total_data_buflen;
 535         rndis_pkt = &rndis_msg->msg.pkt;
 536         rndis_pkt->data_offset = sizeof(struct rndis_packet);
 537         rndis_pkt->data_len = packet->total_data_buflen;
 538         rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
 539
 540         rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
 541
 542         hash = skb_get_hash_raw(skb);
 543         if (hash != 0 && net->real_num_tx_queues > 1) {
 544                 rndis_msg_size += NDIS_HASH_PPI_SIZE;
 545                 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
 546                                     NBL_HASH_VALUE);
 547                 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
 548         }
 549
 550         if (skb_vlan_tag_present(skb)) {
 551                 struct ndis_pkt_8021q_info *vlan;
 552
 553                 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
 554                 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
 555                                     IEEE_8021Q_INFO);
 556
 557                 vlan = (void *)ppi + ppi->ppi_offset;
 558                 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
 559                 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
 560                                 VLAN_PRIO_SHIFT;
 561         }
 562
 563         if (skb_is_gso(skb)) {
 564                 struct ndis_tcp_lso_info *lso_info;
 565
 566                 rndis_msg_size += NDIS_LSO_PPI_SIZE;
 567                 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
 568                                     TCP_LARGESEND_PKTINFO);
 569
 570                 lso_info = (void *)ppi + ppi->ppi_offset;
 571
 572                 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
 573                 if (skb->protocol == htons(ETH_P_IP)) {
 574                         lso_info->lso_v2_transmit.ip_version =
 575                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
 576                         ip_hdr(skb)->tot_len = 0;
 577                         ip_hdr(skb)->check = 0;
 578                         tcp_hdr(skb)->check =
 579                                 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 580                                                    ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 581                 } else {
 582                         lso_info->lso_v2_transmit.ip_version =
 583                                 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
 584                         ipv6_hdr(skb)->payload_len = 0;
 585                         tcp_hdr(skb)->check =
 586                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 587                                                  &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 588                 }
 589                 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
 590                 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
 591         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 592                 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
 593                         struct ndis_tcp_ip_checksum_info *csum_info;
 594
 595                         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 596                         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 597                                             TCPIP_CHKSUM_PKTINFO);
 598
 599                         csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 600                                                                          ppi->ppi_offset);
 601
 602                         csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
 603
 604                         if (skb->protocol == htons(ETH_P_IP)) {
 605                                 csum_info->transmit.is_ipv4 = 1;
 606
 607                                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 608                                         csum_info->transmit.tcp_checksum = 1;
 609                                 else
 610                                         csum_info->transmit.udp_checksum = 1;
 611                         } else {
 612                                 csum_info->transmit.is_ipv6 = 1;
 613
 614                                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
 615                                         csum_info->transmit.tcp_checksum = 1;
 616                                 else
 617                                         csum_info->transmit.udp_checksum = 1;
 618                         }
 619                 } else {
 620                         /* Can't do offload of this type of checksum */
 621                         if (skb_checksum_help(skb))
 622                                 goto drop;
 623                 }
 624         }
 625
 626         /* Start filling in the page buffers with the rndis hdr */
 627         rndis_msg->msg_len += rndis_msg_size;
 628         packet->total_data_buflen = rndis_msg->msg_len;
 629         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 630                                                skb, packet, pb);
 631
 632         /* timestamp packet in software */
 633         skb_tx_timestamp(skb);
 634
 635         ret = netvsc_send(net_device_ctx, packet, rndis_msg, pb, skb);
 636         if (likely(ret == 0))
 637                 return NETDEV_TX_OK;
 638
 639         if (ret == -EAGAIN) {
 640                 ++net_device_ctx->eth_stats.tx_busy;
 641                 return NETDEV_TX_BUSY;
 642         }
 643
 644         if (ret == -ENOSPC)
 645                 ++net_device_ctx->eth_stats.tx_no_space;
 646
 647 drop:
 648         dev_kfree_skb_any(skb);
 649         net->stats.tx_dropped++;
 650
 651         return NETDEV_TX_OK;
 652
 653 no_memory:
 654         ++net_device_ctx->eth_stats.tx_no_memory;
 655         goto drop;
 656 }
 657
 658 /*
 659  * netvsc_linkstatus_callback - Link up/down notification
 660  */
 661 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 662                                 struct rndis_message *resp)
 663 {
 664         struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
 665         struct net_device *net;
 666         struct net_device_context *ndev_ctx;
 667         struct netvsc_reconfig *event;
 668         unsigned long flags;
 669
 670         net = hv_get_drvdata(device_obj);
 671
 672         if (!net)
 673                 return;
 674
 675         ndev_ctx = netdev_priv(net);
 676
 677         /* Update the physical link speed when changing to another vSwitch */
 678         if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
 679                 u32 speed;
 680
 681                 speed = *(u32 *)((void *)indicate
 682                                  + indicate->status_buf_offset) / 10000;
 683                 ndev_ctx->speed = speed;
 684                 return;
 685         }
 686
 687         /* Handle these link change statuses below */
 688         if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
 689             indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
 690             indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
 691                 return;
 692
 693         if (net->reg_state != NETREG_REGISTERED)
 694                 return;
 695
 696         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 697         if (!event)
 698                 return;
 699         event->event = indicate->status;
 700
 701         spin_lock_irqsave(&ndev_ctx->lock, flags);
 702         list_add_tail(&event->list, &ndev_ctx->reconfig_events);
 703         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
 704
 705         schedule_delayed_work(&ndev_ctx->dwork, 0);
 706 }
 707
 708 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 709                                              struct napi_struct *napi,
 710                                              const struct ndis_tcp_ip_checksum_info *csum_info,
 711                                              const struct ndis_pkt_8021q_info *vlan,
 712                                              void *data, u32 buflen)
 713 {
 714         struct sk_buff *skb;
 715
 716         skb = napi_alloc_skb(napi, buflen);
 717         if (!skb)
 718                 return skb;
 719
 720         /*
 721          * Copy to skb. This copy is needed here since the memory pointed by
 722          * hv_netvsc_packet cannot be deallocated
 723          */
 724         skb_put_data(skb, data, buflen);
 725
 726         skb->protocol = eth_type_trans(skb, net);
 727
 728         /* skb is already created with CHECKSUM_NONE */
 729         skb_checksum_none_assert(skb);
 730
 731         /*
 732          * In Linux, the IP checksum is always checked.
 733          * Do L4 checksum offload if enabled and present.
 734          */
 735         if (csum_info && (net->features & NETIF_F_RXCSUM)) {
 736                 if (csum_info->receive.tcp_checksum_succeeded ||
 737                     csum_info->receive.udp_checksum_succeeded)
 738                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 739         }
 740
 741         if (vlan) {
 742                 u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
 743
 744                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 745                                        vlan_tci);
 746         }
 747
 748         return skb;
 749 }
 750
 751 /*
 752  * netvsc_recv_callback -  Callback when we receive a packet from the
 753  * "wire" on the specified device.
 754  */
 755 int netvsc_recv_callback(struct net_device *net,
 756                          struct vmbus_channel *channel,
 757                          void  *data, u32 len,
 758                          const struct ndis_tcp_ip_checksum_info *csum_info,
 759                          const struct ndis_pkt_8021q_info *vlan)
 760 {
 761         struct net_device_context *net_device_ctx = netdev_priv(net);
 762         struct netvsc_device *net_device;
 763         u16 q_idx = channel->offermsg.offer.sub_channel_index;
 764         struct netvsc_channel *nvchan;
 765         struct sk_buff *skb;
 766         struct netvsc_stats *rx_stats;
 767
 768         if (net->reg_state != NETREG_REGISTERED)
 769                 return NVSP_STAT_FAIL;
 770
 771         rcu_read_lock();
 772         net_device = rcu_dereference(net_device_ctx->nvdev);
 773         if (unlikely(!net_device))
 774                 goto drop;
 775
 776         nvchan = &net_device->chan_table[q_idx];
 777
 778         /* Allocate a skb - TODO direct I/O to pages? */
 779         skb = netvsc_alloc_recv_skb(net, &nvchan->napi,
 780                                     csum_info, vlan, data, len);
 781         if (unlikely(!skb)) {
 782 drop:
 783                 ++net->stats.rx_dropped;
 784                 rcu_read_unlock();
 785                 return NVSP_STAT_FAIL;
 786         }
 787
 788         skb_record_rx_queue(skb, q_idx);
 789
 790         /*
 791          * Even if injecting the packet, record the statistics
 792          * on the synthetic device because modifying the VF device
 793          * statistics will not work correctly.
 794          */
 795         rx_stats = &nvchan->rx_stats;
 796         u64_stats_update_begin(&rx_stats->syncp);
 797         rx_stats->packets++;
 798         rx_stats->bytes += len;
 799
 800         if (skb->pkt_type == PACKET_BROADCAST)
 801                 ++rx_stats->broadcast;
 802         else if (skb->pkt_type == PACKET_MULTICAST)
 803                 ++rx_stats->multicast;
 804         u64_stats_update_end(&rx_stats->syncp);
 805
 806         napi_gro_receive(&nvchan->napi, skb);
 807         rcu_read_unlock();
 808
 809         return 0;
 810 }
 811
 812 static void netvsc_get_drvinfo(struct net_device *net,
 813                                struct ethtool_drvinfo *info)
 814 {
 815         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 816         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 817 }
 818
 819 static void netvsc_get_channels(struct net_device *net,
 820                                 struct ethtool_channels *channel)
 821 {
 822         struct net_device_context *net_device_ctx = netdev_priv(net);
 823         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 824
 825         if (nvdev) {
 826                 channel->max_combined   = nvdev->max_chn;
 827                 channel->combined_count = nvdev->num_chn;
 828         }
 829 }
 830
 831 static int netvsc_set_channels(struct net_device *net,
 832                                struct ethtool_channels *channels)
 833 {
 834         struct net_device_context *net_device_ctx = netdev_priv(net);
 835         struct hv_device *dev = net_device_ctx->device_ctx;
 836         struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 837         unsigned int orig, count = channels->combined_count;
 838         struct netvsc_device_info device_info;
 839         bool was_opened;
 840         int ret = 0;
 841
 842         /* We do not support separate count for rx, tx, or other */
 843         if (count == 0 ||
 844             channels->rx_count || channels->tx_count || channels->other_count)
 845                 return -EINVAL;
 846
 847         if (!nvdev || nvdev->destroy)
 848                 return -ENODEV;
 849
 850         if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
 851                 return -EINVAL;
 852
 853         if (count > nvdev->max_chn)
 854                 return -EINVAL;
 855
 856         orig = nvdev->num_chn;
 857         was_opened = rndis_filter_opened(nvdev);
 858         if (was_opened)
 859                 rndis_filter_close(nvdev);
 860
 861         memset(&device_info, 0, sizeof(device_info));
 862         device_info.num_chn = count;
 863         device_info.ring_size = ring_size;
 864         device_info.send_sections = nvdev->send_section_cnt;
 865         device_info.send_section_size = nvdev->send_section_size;
 866         device_info.recv_sections = nvdev->recv_section_cnt;
 867         device_info.recv_section_size = nvdev->recv_section_size;
 868
 869         rndis_filter_device_remove(dev, nvdev);
 870
 871         nvdev = rndis_filter_device_add(dev, &device_info);
 872         if (IS_ERR(nvdev)) {
 873                 ret = PTR_ERR(nvdev);
 874                 device_info.num_chn = orig;
 875                 nvdev = rndis_filter_device_add(dev, &device_info);
 876
 877                 if (IS_ERR(nvdev)) {
 878                         netdev_err(net, "restoring channel setting failed: %ld\n",
 879                                    PTR_ERR(nvdev));
 880                         return ret;
 881                 }
 882         }
 883
 884         if (was_opened)
 885                 rndis_filter_open(nvdev);
 886
 887         /* We may have missed link change notifications */
 888         net_device_ctx->last_reconfig = 0;
 889         schedule_delayed_work(&net_device_ctx->dwork, 0);
 890
 891         return ret;
 892 }
 893
 894 static bool
 895 netvsc_validate_ethtool_ss_cmd(const struct ethtool_link_ksettings *cmd)
 896 {
 897         struct ethtool_link_ksettings diff1 = *cmd;
 898         struct ethtool_link_ksettings diff2 = {};
 899
 900         diff1.base.speed = 0;
 901         diff1.base.duplex = 0;
 902         /* advertising and cmd are usually set */
 903         ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
 904         diff1.base.cmd = 0;
 905         /* We set port to PORT_OTHER */
 906         diff2.base.port = PORT_OTHER;
 907
 908         return !memcmp(&diff1, &diff2, sizeof(diff1));
 909 }
 910
 911 static void netvsc_init_settings(struct net_device *dev)
 912 {
 913         struct net_device_context *ndc = netdev_priv(dev);
 914
 915         ndc->l4_hash = HV_DEFAULT_L4HASH;
 916
 917         ndc->speed = SPEED_UNKNOWN;
 918         ndc->duplex = DUPLEX_FULL;
 919 }
 920
 921 static int netvsc_get_link_ksettings(struct net_device *dev,
 922                                      struct ethtool_link_ksettings *cmd)
 923 {
 924         struct net_device_context *ndc = netdev_priv(dev);
 925
 926         cmd->base.speed = ndc->speed;
 927         cmd->base.duplex = ndc->duplex;
 928         cmd->base.port = PORT_OTHER;
 929
 930         return 0;
 931 }
 932
 933 static int netvsc_set_link_ksettings(struct net_device *dev,
 934                                      const struct ethtool_link_ksettings *cmd)
 935 {
 936         struct net_device_context *ndc = netdev_priv(dev);
 937         u32 speed;
 938
 939         speed = cmd->base.speed;
 940         if (!ethtool_validate_speed(speed) ||
 941             !ethtool_validate_duplex(cmd->base.duplex) ||
 942             !netvsc_validate_ethtool_ss_cmd(cmd))
 943                 return -EINVAL;
 944
 945         ndc->speed = speed;
 946         ndc->duplex = cmd->base.duplex;
 947
 948         return 0;
 949 }
 950
 951 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 952 {
 953         struct net_device_context *ndevctx = netdev_priv(ndev);
 954         struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
 955         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
 956         struct hv_device *hdev = ndevctx->device_ctx;
 957         int orig_mtu = ndev->mtu;
 958         struct netvsc_device_info device_info;
 959         bool was_opened;
 960         int ret = 0;
 961
 962         if (!nvdev || nvdev->destroy)
 963                 return -ENODEV;
 964
 965         /* Change MTU of underlying VF netdev first. */
 966         if (vf_netdev) {
 967                 ret = dev_set_mtu(vf_netdev, mtu);
 968                 if (ret)
 969                         return ret;
 970         }
 971
 972         netif_device_detach(ndev);
 973         was_opened = rndis_filter_opened(nvdev);
 974         if (was_opened)
 975                 rndis_filter_close(nvdev);
 976
 977         memset(&device_info, 0, sizeof(device_info));
 978         device_info.ring_size = ring_size;
 979         device_info.num_chn = nvdev->num_chn;
 980         device_info.send_sections = nvdev->send_section_cnt;
 981         device_info.send_section_size = nvdev->send_section_size;
 982         device_info.recv_sections = nvdev->recv_section_cnt;
 983         device_info.recv_section_size = nvdev->recv_section_size;
 984
 985         rndis_filter_device_remove(hdev, nvdev);
 986
 987         ndev->mtu = mtu;
 988
 989         nvdev = rndis_filter_device_add(hdev, &device_info);
 990         if (IS_ERR(nvdev)) {
 991                 ret = PTR_ERR(nvdev);
 992
 993                 /* Attempt rollback to original MTU */
 994                 ndev->mtu = orig_mtu;
 995                 nvdev = rndis_filter_device_add(hdev, &device_info);
 996
 997                 if (vf_netdev)
 998                         dev_set_mtu(vf_netdev, orig_mtu);
 999
1000                 if (IS_ERR(nvdev)) {
1001                         netdev_err(ndev, "restoring mtu failed: %ld\n",
1002                                    PTR_ERR(nvdev));
1003                         return ret;
1004                 }
1005         }
1006
1007         if (was_opened)
1008                 rndis_filter_open(nvdev);
1009
1010         netif_device_attach(ndev);
1011
1012         /* We may have missed link change notifications */
1013         schedule_delayed_work(&ndevctx->dwork, 0);
1014
1015         return ret;
1016 }
1017
1018 static void netvsc_get_vf_stats(struct net_device *net,
1019                                 struct netvsc_vf_pcpu_stats *tot)
1020 {
1021         struct net_device_context *ndev_ctx = netdev_priv(net);
1022         int i;
1023
1024         memset(tot, 0, sizeof(*tot));
1025
1026         for_each_possible_cpu(i) {
1027                 const struct netvsc_vf_pcpu_stats *stats
1028                         = per_cpu_ptr(ndev_ctx->vf_stats, i);
1029                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1030                 unsigned int start;
1031
1032                 do {
1033                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1034                         rx_packets = stats->rx_packets;
1035                         tx_packets = stats->tx_packets;
1036                         rx_bytes = stats->rx_bytes;
1037                         tx_bytes = stats->tx_bytes;
1038                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1039
1040                 tot->rx_packets += rx_packets;
1041                 tot->tx_packets += tx_packets;
1042                 tot->rx_bytes   += rx_bytes;
1043                 tot->tx_bytes   += tx_bytes;
1044                 tot->tx_dropped += stats->tx_dropped;
1045         }
1046 }
1047
1048 static void netvsc_get_stats64(struct net_device *net,
1049                                struct rtnl_link_stats64 *t)
1050 {
1051         struct net_device_context *ndev_ctx = netdev_priv(net);
1052         struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev);
1053         struct netvsc_vf_pcpu_stats vf_tot;
1054         int i;
1055
1056         if (!nvdev)
1057                 return;
1058
1059         netdev_stats_to_stats64(t, &net->stats);
1060
1061         netvsc_get_vf_stats(net, &vf_tot);
1062         t->rx_packets += vf_tot.rx_packets;
1063         t->tx_packets += vf_tot.tx_packets;
1064         t->rx_bytes   += vf_tot.rx_bytes;
1065         t->tx_bytes   += vf_tot.tx_bytes;
1066         t->tx_dropped += vf_tot.tx_dropped;
1067
1068         for (i = 0; i < nvdev->num_chn; i++) {
1069                 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1070                 const struct netvsc_stats *stats;
1071                 u64 packets, bytes, multicast;
1072                 unsigned int start;
1073
1074                 stats = &nvchan->tx_stats;
1075                 do {
1076                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1077                         packets = stats->packets;
1078                         bytes = stats->bytes;
1079                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1080
1081                 t->tx_bytes     += bytes;
1082                 t->tx_packets   += packets;
1083
1084                 stats = &nvchan->rx_stats;
1085                 do {
1086                         start = u64_stats_fetch_begin_irq(&stats->syncp);
1087                         packets = stats->packets;
1088                         bytes = stats->bytes;
1089                         multicast = stats->multicast + stats->broadcast;
1090                 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1091
1092                 t->rx_bytes     += bytes;
1093                 t->rx_packets   += packets;
1094                 t->multicast    += multicast;
1095         }
1096 }
1097
1098 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
1099 {
1100         struct net_device_context *ndc = netdev_priv(ndev);
1101         struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
1102         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1103         struct sockaddr *addr = p;
1104         int err;
1105
1106         err = eth_prepare_mac_addr_change(ndev, p);
1107         if (err)
1108                 return err;
1109
1110         if (!nvdev)
1111                 return -ENODEV;
1112
1113         if (vf_netdev) {
1114                 err = dev_set_mac_address(vf_netdev, addr);
1115                 if (err)
1116                         return err;
1117         }
1118
1119         err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
1120         if (!err) {
1121                 eth_commit_mac_addr_change(ndev, p);
1122         } else if (vf_netdev) {
1123                 /* rollback change on VF */
1124                 memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
1125                 dev_set_mac_address(vf_netdev, addr);
1126         }
1127
1128         return err;
1129 }
1130
1131 static const struct {
1132         char name[ETH_GSTRING_LEN];
1133         u16 offset;
1134 } netvsc_stats[] = {
1135         { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
1136         { "tx_no_memory",  offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
1137         { "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },
1138         { "tx_too_big",   offsetof(struct netvsc_ethtool_stats, tx_too_big) },
1139         { "tx_busy",      offsetof(struct netvsc_ethtool_stats, tx_busy) },
1140         { "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },
1141         { "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },
1142         { "stop_queue", offsetof(struct netvsc_ethtool_stats, stop_queue) },
1143         { "wake_queue", offsetof(struct netvsc_ethtool_stats, wake_queue) },
1144 }, vf_stats[] = {
1145         { "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },
1146         { "vf_rx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },
1147         { "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },
1148         { "vf_tx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },
1149         { "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },
1150 };
1151
1152 #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats)
1153 #define NETVSC_VF_STATS_LEN     ARRAY_SIZE(vf_stats)
1154
1155 /* 4 statistics per queue (rx/tx packets/bytes) */
1156 #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4)
1157
1158 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
1159 {
1160         struct net_device_context *ndc = netdev_priv(dev);
1161         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1162
1163         if (!nvdev)
1164                 return -ENODEV;
1165
1166         switch (string_set) {
1167         case ETH_SS_STATS:
1168                 return NETVSC_GLOBAL_STATS_LEN
1169                         + NETVSC_VF_STATS_LEN
1170                         + NETVSC_QUEUE_STATS_LEN(nvdev);
1171         default:
1172                 return -EINVAL;
1173         }
1174 }
1175
1176 static void netvsc_get_ethtool_stats(struct net_device *dev,
1177                                      struct ethtool_stats *stats, u64 *data)
1178 {
1179         struct net_device_context *ndc = netdev_priv(dev);
1180         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1181         const void *nds = &ndc->eth_stats;
1182         const struct netvsc_stats *qstats;
1183         struct netvsc_vf_pcpu_stats sum;
1184         unsigned int start;
1185         u64 packets, bytes;
1186         int i, j;
1187
1188         if (!nvdev)
1189                 return;
1190
1191         for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
1192                 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1193
1194         netvsc_get_vf_stats(dev, &sum);
1195         for (j = 0; j < NETVSC_VF_STATS_LEN; j++)
1196                 data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);
1197
1198         for (j = 0; j < nvdev->num_chn; j++) {
1199                 qstats = &nvdev->chan_table[j].tx_stats;
1200
1201                 do {
1202                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1203                         packets = qstats->packets;
1204                         bytes = qstats->bytes;
1205                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1206                 data[i++] = packets;
1207                 data[i++] = bytes;
1208
1209                 qstats = &nvdev->chan_table[j].rx_stats;
1210                 do {
1211                         start = u64_stats_fetch_begin_irq(&qstats->syncp);
1212                         packets = qstats->packets;
1213                         bytes = qstats->bytes;
1214                 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1215                 data[i++] = packets;
1216                 data[i++] = bytes;
1217         }
1218 }
1219
1220 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1221 {
1222         struct net_device_context *ndc = netdev_priv(dev);
1223         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1224         u8 *p = data;
1225         int i;
1226
1227         if (!nvdev)
1228                 return;
1229
1230         switch (stringset) {
1231         case ETH_SS_STATS:
1232                 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) {
1233                         memcpy(p, netvsc_stats[i].name, ETH_GSTRING_LEN);
1234                         p += ETH_GSTRING_LEN;
1235                 }
1236
1237                 for (i = 0; i < ARRAY_SIZE(vf_stats); i++) {
1238                         memcpy(p, vf_stats[i].name, ETH_GSTRING_LEN);
1239                         p += ETH_GSTRING_LEN;
1240                 }
1241
1242                 for (i = 0; i < nvdev->num_chn; i++) {
1243                         sprintf(p, "tx_queue_%u_packets", i);
1244                         p += ETH_GSTRING_LEN;
1245                         sprintf(p, "tx_queue_%u_bytes", i);
1246                         p += ETH_GSTRING_LEN;
1247                         sprintf(p, "rx_queue_%u_packets", i);
1248                         p += ETH_GSTRING_LEN;
1249                         sprintf(p, "rx_queue_%u_bytes", i);
1250                         p += ETH_GSTRING_LEN;
1251                 }
1252
1253                 break;
1254         }
1255 }
1256
1257 static int
1258 netvsc_get_rss_hash_opts(struct net_device_context *ndc,
1259                          struct ethtool_rxnfc *info)
1260 {
1261         const u32 l4_flag = RXH_L4_B_0_1 | RXH_L4_B_2_3;
1262
1263         info->data = RXH_IP_SRC | RXH_IP_DST;
1264
1265         switch (info->flow_type) {
1266         case TCP_V4_FLOW:
1267                 if (ndc->l4_hash & HV_TCP4_L4HASH)
1268                         info->data |= l4_flag;
1269
1270                 break;
1271
1272         case TCP_V6_FLOW:
1273                 if (ndc->l4_hash & HV_TCP6_L4HASH)
1274                         info->data |= l4_flag;
1275
1276                 break;
1277
1278         case UDP_V4_FLOW:
1279                 if (ndc->l4_hash & HV_UDP4_L4HASH)
1280                         info->data |= l4_flag;
1281
1282                 break;
1283
1284         case UDP_V6_FLOW:
1285                 if (ndc->l4_hash & HV_UDP6_L4HASH)
1286                         info->data |= l4_flag;
1287
1288                 break;
1289
1290         case IPV4_FLOW:
1291         case IPV6_FLOW:
1292                 break;
1293         default:
1294                 info->data = 0;
1295                 break;
1296         }
1297
1298         return 0;
1299 }
1300
1301 static int
1302 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1303                  u32 *rules)
1304 {
1305         struct net_device_context *ndc = netdev_priv(dev);
1306         struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1307
1308         if (!nvdev)
1309                 return -ENODEV;
1310
1311         switch (info->cmd) {
1312         case ETHTOOL_GRXRINGS:
1313                 info->data = nvdev->num_chn;
1314                 return 0;
1315
1316         case ETHTOOL_GRXFH:
1317                 return netvsc_get_rss_hash_opts(ndc, info);
1318         }
1319         return -EOPNOTSUPP;
1320 }
1321
1322 static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
1323                                     struct ethtool_rxnfc *info)
1324 {
1325         if (info->data == (RXH_IP_SRC | RXH_IP_DST |
1326                            RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
1327                 switch (info->flow_type) {
1328                 case TCP_V4_FLOW:
1329                         ndc->l4_hash |= HV_TCP4_L4HASH;
1330                         break;
1331
1332                 case TCP_V6_FLOW:
1333                         ndc->l4_hash |= HV_TCP6_L4HASH;
1334                         break;
1335
1336                 case UDP_V4_FLOW:
1337                         ndc->l4_hash |= HV_UDP4_L4HASH;
1338                         break;
1339
1340                 case UDP_V6_FLOW:
1341                         ndc->l4_hash |= HV_UDP6_L4HASH;
1342                         break;
1343
1344                 default:
1345                         return -EOPNOTSUPP;
1346                 }
1347
1348                 return 0;
1349         }
1350
1351         if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {
1352                 switch (info->flow_type) {
1353                 case TCP_V4_FLOW:
1354                         ndc->l4_hash &= ~HV_TCP4_L4HASH;
1355                         break;
1356
1357                 case TCP_V6_FLOW:
1358                         ndc->l4_hash &= ~HV_TCP6_L4HASH;
1359                         break;
1360
1361                 case UDP_V4_FLOW:
1362                         ndc->l4_hash &= ~HV_UDP4_L4HASH;
1363                         break;
1364
1365                 case UDP_V6_FLOW:
1366                         ndc->l4_hash &= ~HV_UDP6_L4HASH;
1367                         break;
1368
1369                 default:
1370                         return -EOPNOTSUPP;
1371                 }
1372
1373                 return 0;
1374         }
1375
1376         return -EOPNOTSUPP;
1377 }
1378
1379 static int
1380 netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
1381 {
1382         struct net_device_context *ndc = netdev_priv(ndev);
1383
1384         if (info->cmd == ETHTOOL_SRXFH)
1385                 return netvsc_set_rss_hash_opts(ndc, info);
1386
1387         return -EOPNOTSUPP;
1388 }
1389
1390 #ifdef CONFIG_NET_POLL_CONTROLLER
1391 static void netvsc_poll_controller(struct net_device *dev)
1392 {
1393         struct net_device_context *ndc = netdev_priv(dev);
1394         struct netvsc_device *ndev;
1395         int i;
1396
1397         rcu_read_lock();
1398         ndev = rcu_dereference(ndc->nvdev);
1399         if (ndev) {
1400                 for (i = 0; i < ndev->num_chn; i++) {
1401                         struct netvsc_channel *nvchan = &ndev->chan_table[i];
1402
1403                         napi_schedule(&nvchan->napi);
1404                 }
1405         }
1406         rcu_read_unlock();
1407 }
1408 #endif
1409
1410 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1411 {
1412         return NETVSC_HASH_KEYLEN;
1413 }
1414
1415 static u32 netvsc_rss_indir_size(struct net_device *dev)
1416 {
1417         return ITAB_NUM;
1418 }
1419
1420 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1421                            u8 *hfunc)
1422 {
1423         struct net_device_context *ndc = netdev_priv(dev);
1424         struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1425         struct rndis_device *rndis_dev;
1426         int i;
1427
1428         if (!ndev)
1429                 return -ENODEV;
1430
1431         if (hfunc)
1432                 *hfunc = ETH_RSS_HASH_TOP;      /* Toeplitz */
1433
1434         rndis_dev = ndev->extension;
1435         if (indir) {
1436                 for (i = 0; i < ITAB_NUM; i++)
1437                         indir[i] = rndis_dev->rx_table[i];
1438         }
1439
1440         if (key)
1441                 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1442
1443         return 0;
1444 }
1445
1446 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1447                            const u8 *key, const u8 hfunc)
1448 {
1449         struct net_device_context *ndc = netdev_priv(dev);
1450         struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1451         struct rndis_device *rndis_dev;
1452         int i;
1453
1454         if (!ndev)
1455                 return -ENODEV;
1456
1457         if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1458                 return -EOPNOTSUPP;
1459
1460         rndis_dev = ndev->extension;
1461         if (indir) {
1462                 for (i = 0; i < ITAB_NUM; i++)
1463                         if (indir[i] >= ndev->num_chn)
1464                                 return -EINVAL;
1465
1466                 for (i = 0; i < ITAB_NUM; i++)
1467                         rndis_dev->rx_table[i] = indir[i];
1468         }
1469
1470         if (!key) {
1471                 if (!indir)
1472                         return 0;
1473
1474                 key = rndis_dev->rss_key;
1475         }
1476
1477         return rndis_filter_set_rss_param(rndis_dev, key);
1478 }
1479
1480 /* Hyper-V RNDIS protocol does not have ring in the HW sense.
1481  * It does have pre-allocated receive area which is divided into sections.
1482  */
1483 static void __netvsc_get_ringparam(struct netvsc_device *nvdev,
1484                                    struct ethtool_ringparam *ring)
1485 {
1486         u32 max_buf_size;
1487
1488         ring->rx_pending = nvdev->recv_section_cnt;
1489         ring->tx_pending = nvdev->send_section_cnt;
1490
1491         if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
1492                 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
1493         else
1494                 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
1495
1496         ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;
1497         ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE
1498                 / nvdev->send_section_size;
1499 }
1500
1501 static void netvsc_get_ringparam(struct net_device *ndev,
1502                                  struct ethtool_ringparam *ring)
1503 {
1504         struct net_device_context *ndevctx = netdev_priv(ndev);
1505         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1506
1507         if (!nvdev)
1508                 return;
1509
1510         __netvsc_get_ringparam(nvdev, ring);
1511 }
1512
1513 static int netvsc_set_ringparam(struct net_device *ndev,
1514                                 struct ethtool_ringparam *ring)
1515 {
1516         struct net_device_context *ndevctx = netdev_priv(ndev);
1517         struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1518         struct hv_device *hdev = ndevctx->device_ctx;
1519         struct netvsc_device_info device_info;
1520         struct ethtool_ringparam orig;
1521         u32 new_tx, new_rx;
1522         bool was_opened;
1523         int ret = 0;
1524
1525         if (!nvdev || nvdev->destroy)
1526                 return -ENODEV;
1527
1528         memset(&orig, 0, sizeof(orig));
1529         __netvsc_get_ringparam(nvdev, &orig);
1530
1531         new_tx = clamp_t(u32, ring->tx_pending,
1532                          NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);
1533         new_rx = clamp_t(u32, ring->rx_pending,
1534                          NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);
1535
1536         if (new_tx == orig.tx_pending &&
1537             new_rx == orig.rx_pending)
1538                 return 0;        /* no change */
1539
1540         memset(&device_info, 0, sizeof(device_info));
1541         device_info.num_chn = nvdev->num_chn;
1542         device_info.ring_size = ring_size;
1543         device_info.send_sections = new_tx;
1544         device_info.send_section_size = nvdev->send_section_size;
1545         device_info.recv_sections = new_rx;
1546         device_info.recv_section_size = nvdev->recv_section_size;
1547
1548         netif_device_detach(ndev);
1549         was_opened = rndis_filter_opened(nvdev);
1550         if (was_opened)
1551                 rndis_filter_close(nvdev);
1552
1553         rndis_filter_device_remove(hdev, nvdev);
1554
1555         nvdev = rndis_filter_device_add(hdev, &device_info);
1556         if (IS_ERR(nvdev)) {
1557                 ret = PTR_ERR(nvdev);
1558
1559                 device_info.send_sections = orig.tx_pending;
1560                 device_info.recv_sections = orig.rx_pending;
1561                 nvdev = rndis_filter_device_add(hdev, &device_info);
1562                 if (IS_ERR(nvdev)) {
1563                         netdev_err(ndev, "restoring ringparam failed: %ld\n",
1564                                    PTR_ERR(nvdev));
1565                         return ret;
1566                 }
1567         }
1568
1569         if (was_opened)
1570                 rndis_filter_open(nvdev);
1571         netif_device_attach(ndev);
1572
1573         /* We may have missed link change notifications */
1574         ndevctx->last_reconfig = 0;
1575         schedule_delayed_work(&ndevctx->dwork, 0);
1576
1577         return ret;
1578 }
1579
1580 static const struct ethtool_ops ethtool_ops = {
1581         .get_drvinfo    = netvsc_get_drvinfo,
1582         .get_link       = ethtool_op_get_link,
1583         .get_ethtool_stats = netvsc_get_ethtool_stats,
1584         .get_sset_count = netvsc_get_sset_count,
1585         .get_strings    = netvsc_get_strings,
1586         .get_channels   = netvsc_get_channels,
1587         .set_channels   = netvsc_set_channels,
1588         .get_ts_info    = ethtool_op_get_ts_info,
1589         .get_rxnfc      = netvsc_get_rxnfc,
1590         .set_rxnfc      = netvsc_set_rxnfc,
1591         .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1592         .get_rxfh_indir_size = netvsc_rss_indir_size,
1593         .get_rxfh       = netvsc_get_rxfh,
1594         .set_rxfh       = netvsc_set_rxfh,
1595         .get_link_ksettings = netvsc_get_link_ksettings,
1596         .set_link_ksettings = netvsc_set_link_ksettings,
1597         .get_ringparam  = netvsc_get_ringparam,
1598         .set_ringparam  = netvsc_set_ringparam,
1599 };
1600
1601 static const struct net_device_ops device_ops = {
1602         .ndo_open =                     netvsc_open,
1603         .ndo_stop =                     netvsc_close,
1604         .ndo_start_xmit =               netvsc_start_xmit,
1605         .ndo_set_rx_mode =              netvsc_set_multicast_list,
1606         .ndo_change_mtu =               netvsc_change_mtu,
1607         .ndo_validate_addr =            eth_validate_addr,
1608         .ndo_set_mac_address =          netvsc_set_mac_addr,
1609         .ndo_select_queue =             netvsc_select_queue,
1610         .ndo_get_stats64 =              netvsc_get_stats64,
1611 #ifdef CONFIG_NET_POLL_CONTROLLER
1612         .ndo_poll_controller =          netvsc_poll_controller,
1613 #endif
1614 };
1615
1616 /*
1617  * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1618  * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1619  * present send GARP packet to network peers with netif_notify_peers().
1620  */
1621 static void netvsc_link_change(struct work_struct *w)
1622 {
1623         struct net_device_context *ndev_ctx =
1624                 container_of(w, struct net_device_context, dwork.work);
1625         struct hv_device *device_obj = ndev_ctx->device_ctx;
1626         struct net_device *net = hv_get_drvdata(device_obj);
1627         struct netvsc_device *net_device;
1628         struct rndis_device *rdev;
1629         struct netvsc_reconfig *event = NULL;
1630         bool notify = false, reschedule = false;
1631         unsigned long flags, next_reconfig, delay;
1632
1633         /* if changes are happening, comeback later */
1634         if (!rtnl_trylock()) {
1635                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1636                 return;
1637         }
1638
1639         net_device = rtnl_dereference(ndev_ctx->nvdev);
1640         if (!net_device)
1641                 goto out_unlock;
1642
1643         rdev = net_device->extension;
1644
1645         next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1646         if (time_is_after_jiffies(next_reconfig)) {
1647                 /* link_watch only sends one notification with current state
1648                  * per second, avoid doing reconfig more frequently. Handle
1649                  * wrap around.
1650                  */
1651                 delay = next_reconfig - jiffies;
1652                 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1653                 schedule_delayed_work(&ndev_ctx->dwork, delay);
1654                 goto out_unlock;
1655         }
1656         ndev_ctx->last_reconfig = jiffies;
1657
1658         spin_lock_irqsave(&ndev_ctx->lock, flags);
1659         if (!list_empty(&ndev_ctx->reconfig_events)) {
1660                 event = list_first_entry(&ndev_ctx->reconfig_events,
1661                                          struct netvsc_reconfig, list);
1662                 list_del(&event->list);
1663                 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1664         }
1665         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1666
1667         if (!event)
1668                 goto out_unlock;
1669
1670         switch (event->event) {
1671                 /* Only the following events are possible due to the check in
1672                  * netvsc_linkstatus_callback()
1673                  */
1674         case RNDIS_STATUS_MEDIA_CONNECT:
1675                 if (rdev->link_state) {
1676                         rdev->link_state = false;
1677                         netif_carrier_on(net);
1678                         netif_tx_wake_all_queues(net);
1679                 } else {
1680                         notify = true;
1681                 }
1682                 kfree(event);
1683                 break;
1684         case RNDIS_STATUS_MEDIA_DISCONNECT:
1685                 if (!rdev->link_state) {
1686                         rdev->link_state = true;
1687                         netif_carrier_off(net);
1688                         netif_tx_stop_all_queues(net);
1689                 }
1690                 kfree(event);
1691                 break;
1692         case RNDIS_STATUS_NETWORK_CHANGE:
1693                 /* Only makes sense if carrier is present */
1694                 if (!rdev->link_state) {
1695                         rdev->link_state = true;
1696                         netif_carrier_off(net);
1697                         netif_tx_stop_all_queues(net);
1698                         event->event = RNDIS_STATUS_MEDIA_CONNECT;
1699                         spin_lock_irqsave(&ndev_ctx->lock, flags);
1700                         list_add(&event->list, &ndev_ctx->reconfig_events);
1701                         spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1702                         reschedule = true;
1703                 }
1704                 break;
1705         }
1706
1707         rtnl_unlock();
1708
1709         if (notify)
1710                 netdev_notify_peers(net);
1711
1712         /* link_watch only sends one notification with current state per
1713          * second, handle next reconfig event in 2 seconds.
1714          */
1715         if (reschedule)
1716                 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1717
1718         return;
1719
1720 out_unlock:
1721         rtnl_unlock();
1722 }
1723
1724 static struct net_device *get_netvsc_bymac(const u8 *mac)
1725 {
1726         struct net_device *dev;
1727
1728         ASSERT_RTNL();
1729
1730         for_each_netdev(&init_net, dev) {
1731                 if (dev->netdev_ops != &device_ops)
1732                         continue;       /* not a netvsc device */
1733
1734                 if (ether_addr_equal(mac, dev->perm_addr))
1735                         return dev;
1736         }
1737
1738         return NULL;
1739 }
1740
1741 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1742 {
1743         struct net_device *dev;
1744
1745         ASSERT_RTNL();
1746
1747         for_each_netdev(&init_net, dev) {
1748                 struct net_device_context *net_device_ctx;
1749
1750                 if (dev->netdev_ops != &device_ops)
1751                         continue;       /* not a netvsc device */
1752
1753                 net_device_ctx = netdev_priv(dev);
1754                 if (!rtnl_dereference(net_device_ctx->nvdev))
1755                         continue;       /* device is removed */
1756
1757                 if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev)
1758                         return dev;     /* a match */
1759         }
1760
1761         return NULL;
1762 }
1763
1764 /* Called when VF is injecting data into network stack.
1765  * Change the associated network device from VF to netvsc.
1766  * note: already called with rcu_read_lock
1767  */
1768 static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
1769 {
1770         struct sk_buff *skb = *pskb;
1771         struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);
1772         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1773         struct netvsc_vf_pcpu_stats *pcpu_stats
1774                  = this_cpu_ptr(ndev_ctx->vf_stats);
1775
1776         skb->dev = ndev;
1777
1778         u64_stats_update_begin(&pcpu_stats->syncp);
1779         pcpu_stats->rx_packets++;
1780         pcpu_stats->rx_bytes += skb->len;
1781         u64_stats_update_end(&pcpu_stats->syncp);
1782
1783         return RX_HANDLER_ANOTHER;
1784 }
1785
1786 static int netvsc_vf_join(struct net_device *vf_netdev,
1787                           struct net_device *ndev)
1788 {
1789         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1790         int ret;
1791
1792         ret = netdev_rx_handler_register(vf_netdev,
1793                                          netvsc_vf_handle_frame, ndev);
1794         if (ret != 0) {
1795                 netdev_err(vf_netdev,
1796                            "can not register netvsc VF receive handler (err = %d)\n",
1797                            ret);
1798                 goto rx_handler_failed;
1799         }
1800
1801         ret = netdev_upper_dev_link(vf_netdev, ndev, NULL);
1802         if (ret != 0) {
1803                 netdev_err(vf_netdev,
1804                            "can not set master device %s (err = %d)\n",
1805                            ndev->name, ret);
1806                 goto upper_link_failed;
1807         }
1808
1809         /* set slave flag before open to prevent IPv6 addrconf */
1810         vf_netdev->flags |= IFF_SLAVE;
1811
1812         schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
1813
1814         call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
1815
1816         netdev_info(vf_netdev, "joined to %s\n", ndev->name);
1817         return 0;
1818
1819 upper_link_failed:
1820         netdev_rx_handler_unregister(vf_netdev);
1821 rx_handler_failed:
1822         return ret;
1823 }
1824
1825 static void __netvsc_vf_setup(struct net_device *ndev,
1826                               struct net_device *vf_netdev)
1827 {
1828         int ret;
1829
1830         /* Align MTU of VF with master */
1831         ret = dev_set_mtu(vf_netdev, ndev->mtu);
1832         if (ret)
1833                 netdev_warn(vf_netdev,
1834                             "unable to change mtu to %u\n", ndev->mtu);
1835
1836         if (netif_running(ndev)) {
1837                 ret = dev_open(vf_netdev);
1838                 if (ret)
1839                         netdev_warn(vf_netdev,
1840                                     "unable to open: %d\n", ret);
1841         }
1842 }
1843
1844 /* Setup VF as slave of the synthetic device.
1845  * Runs in workqueue to avoid recursion in netlink callbacks.
1846  */
1847 static void netvsc_vf_setup(struct work_struct *w)
1848 {
1849         struct net_device_context *ndev_ctx
1850                 = container_of(w, struct net_device_context, vf_takeover.work);
1851         struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
1852         struct net_device *vf_netdev;
1853
1854         if (!rtnl_trylock()) {
1855                 schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
1856                 return;
1857         }
1858
1859         vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
1860         if (vf_netdev)
1861                 __netvsc_vf_setup(ndev, vf_netdev);
1862
1863         rtnl_unlock();
1864 }
1865
1866 static int netvsc_register_vf(struct net_device *vf_netdev)
1867 {
1868         struct net_device *ndev;
1869         struct net_device_context *net_device_ctx;
1870         struct netvsc_device *netvsc_dev;
1871
1872         if (vf_netdev->addr_len != ETH_ALEN)
1873                 return NOTIFY_DONE;
1874
1875         /*
1876          * We will use the MAC address to locate the synthetic interface to
1877          * associate with the VF interface. If we don't find a matching
1878          * synthetic interface, move on.
1879          */
1880         ndev = get_netvsc_bymac(vf_netdev->perm_addr);
1881         if (!ndev)
1882                 return NOTIFY_DONE;
1883
1884         net_device_ctx = netdev_priv(ndev);
1885         netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1886         if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
1887                 return NOTIFY_DONE;
1888
1889         if (netvsc_vf_join(vf_netdev, ndev) != 0)
1890                 return NOTIFY_DONE;
1891
1892         netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
1893
1894         dev_hold(vf_netdev);
1895         rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
1896         return NOTIFY_OK;
1897 }
1898
1899 /* VF up/down change detected, schedule to change data path */
1900 static int netvsc_vf_changed(struct net_device *vf_netdev)
1901 {
1902         struct net_device_context *net_device_ctx;
1903         struct netvsc_device *netvsc_dev;
1904         struct net_device *ndev;
1905         bool vf_is_up = netif_running(vf_netdev);
1906
1907         ndev = get_netvsc_byref(vf_netdev);
1908         if (!ndev)
1909                 return NOTIFY_DONE;
1910
1911         net_device_ctx = netdev_priv(ndev);
1912         netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
1913         if (!netvsc_dev)
1914                 return NOTIFY_DONE;
1915
1916         netvsc_switch_datapath(ndev, vf_is_up);
1917         netdev_info(ndev, "Data path switched %s VF: %s\n",
1918                     vf_is_up ? "to" : "from", vf_netdev->name);
1919
1920         return NOTIFY_OK;
1921 }
1922
1923 static int netvsc_unregister_vf(struct net_device *vf_netdev)
1924 {
1925         struct net_device *ndev;
1926         struct net_device_context *net_device_ctx;
1927
1928         ndev = get_netvsc_byref(vf_netdev);
1929         if (!ndev)
1930                 return NOTIFY_DONE;
1931
1932         net_device_ctx = netdev_priv(ndev);
1933         cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
1934
1935         netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
1936
1937         netdev_rx_handler_unregister(vf_netdev);
1938         netdev_upper_dev_unlink(vf_netdev, ndev);
1939         RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
1940         dev_put(vf_netdev);
1941
1942         return NOTIFY_OK;
1943 }
1944
1945 static int netvsc_probe(struct hv_device *dev,
1946                         const struct hv_vmbus_device_id *dev_id)
1947 {
1948         struct net_device *net = NULL;
1949         struct net_device_context *net_device_ctx;
1950         struct netvsc_device_info device_info;
1951         struct netvsc_device *nvdev;
1952         int ret = -ENOMEM;
1953
1954         net = alloc_etherdev_mq(sizeof(struct net_device_context),
1955                                 VRSS_CHANNEL_MAX);
1956         if (!net)
1957                 goto no_net;
1958
1959         netif_carrier_off(net);
1960
1961         netvsc_init_settings(net);
1962
1963         net_device_ctx = netdev_priv(net);
1964         net_device_ctx->device_ctx = dev;
1965         net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1966         if (netif_msg_probe(net_device_ctx))
1967                 netdev_dbg(net, "netvsc msg_enable: %d\n",
1968                            net_device_ctx->msg_enable);
1969
1970         hv_set_drvdata(dev, net);
1971
1972         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1973
1974         spin_lock_init(&net_device_ctx->lock);
1975         INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1976         INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
1977
1978         net_device_ctx->vf_stats
1979                 = netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
1980         if (!net_device_ctx->vf_stats)
1981                 goto no_stats;
1982
1983         net->netdev_ops = &device_ops;
1984         net->ethtool_ops = &ethtool_ops;
1985         SET_NETDEV_DEV(net, &dev->device);
1986
1987         /* We always need headroom for rndis header */
1988         net->needed_headroom = RNDIS_AND_PPI_SIZE;
1989
1990         /* Initialize the number of queues to be 1, we may change it if more
1991          * channels are offered later.
1992          */
1993         netif_set_real_num_tx_queues(net, 1);
1994         netif_set_real_num_rx_queues(net, 1);
1995
1996         /* Notify the netvsc driver of the new device */
1997         memset(&device_info, 0, sizeof(device_info));
1998         device_info.ring_size = ring_size;
1999         device_info.num_chn = VRSS_CHANNEL_DEFAULT;
2000         device_info.send_sections = NETVSC_DEFAULT_TX;
2001         device_info.send_section_size = NETVSC_SEND_SECTION_SIZE;
2002         device_info.recv_sections = NETVSC_DEFAULT_RX;
2003         device_info.recv_section_size = NETVSC_RECV_SECTION_SIZE;
2004
2005         nvdev = rndis_filter_device_add(dev, &device_info);
2006         if (IS_ERR(nvdev)) {
2007                 ret = PTR_ERR(nvdev);
2008                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
2009                 goto rndis_failed;
2010         }
2011
2012         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
2013
2014         /* hw_features computed in rndis_filter_device_add */
2015         net->features = net->hw_features |
2016                 NETIF_F_HIGHDMA | NETIF_F_SG |
2017                 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2018         net->vlan_features = net->features;
2019
2020         netdev_lockdep_set_classes(net);
2021
2022         /* MTU range: 68 - 1500 or 65521 */
2023         net->min_mtu = NETVSC_MTU_MIN;
2024         if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
2025                 net->max_mtu = NETVSC_MTU - ETH_HLEN;
2026         else
2027                 net->max_mtu = ETH_DATA_LEN;
2028
2029         ret = register_netdev(net);
2030         if (ret != 0) {
2031                 pr_err("Unable to register netdev.\n");
2032                 goto register_failed;
2033         }
2034
2035         return ret;
2036
2037 register_failed:
2038         rndis_filter_device_remove(dev, nvdev);
2039 rndis_failed:
2040         free_percpu(net_device_ctx->vf_stats);
2041 no_stats:
2042         hv_set_drvdata(dev, NULL);
2043         free_netdev(net);
2044 no_net:
2045         return ret;
2046 }
2047
2048 static int netvsc_remove(struct hv_device *dev)
2049 {
2050         struct net_device_context *ndev_ctx;
2051         struct net_device *vf_netdev;
2052         struct net_device *net;
2053
2054         net = hv_get_drvdata(dev);
2055         if (net == NULL) {
2056                 dev_err(&dev->device, "No net device to remove\n");
2057                 return 0;
2058         }
2059
2060         ndev_ctx = netdev_priv(net);
2061
2062         netif_device_detach(net);
2063
2064         cancel_delayed_work_sync(&ndev_ctx->dwork);
2065
2066         /*
2067          * Call to the vsc driver to let it know that the device is being
2068          * removed. Also blocks mtu and channel changes.
2069          */
2070         rtnl_lock();
2071         vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
2072         if (vf_netdev)
2073                 netvsc_unregister_vf(vf_netdev);
2074
2075         unregister_netdevice(net);
2076
2077         rndis_filter_device_remove(dev,
2078                                    rtnl_dereference(ndev_ctx->nvdev));
2079         rtnl_unlock();
2080
2081         hv_set_drvdata(dev, NULL);
2082
2083         free_percpu(ndev_ctx->vf_stats);
2084         free_netdev(net);
2085         return 0;
2086 }
2087
2088 static const struct hv_vmbus_device_id id_table[] = {
2089         /* Network guid */
2090         { HV_NIC_GUID, },
2091         { },
2092 };
2093
2094 MODULE_DEVICE_TABLE(vmbus, id_table);
2095
2096 /* The one and only one */
2097 static struct  hv_driver netvsc_drv = {
2098         .name = KBUILD_MODNAME,
2099         .id_table = id_table,
2100         .probe = netvsc_probe,
2101         .remove = netvsc_remove,
2102 };
2103
2104 /*
2105  * On Hyper-V, every VF interface is matched with a corresponding
2106  * synthetic interface. The synthetic interface is presented first
2107  * to the guest. When the corresponding VF instance is registered,
2108  * we will take care of switching the data path.
2109  */
2110 static int netvsc_netdev_event(struct notifier_block *this,
2111                                unsigned long event, void *ptr)
2112 {
2113         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2114
2115         /* Skip our own events */
2116         if (event_dev->netdev_ops == &device_ops)
2117                 return NOTIFY_DONE;
2118
2119         /* Avoid non-Ethernet type devices */
2120         if (event_dev->type != ARPHRD_ETHER)
2121                 return NOTIFY_DONE;
2122
2123         /* Avoid Vlan dev with same MAC registering as VF */
2124         if (is_vlan_dev(event_dev))
2125                 return NOTIFY_DONE;
2126
2127         /* Avoid Bonding master dev with same MAC registering as VF */
2128         if ((event_dev->priv_flags & IFF_BONDING) &&
2129             (event_dev->flags & IFF_MASTER))
2130                 return NOTIFY_DONE;
2131
2132         switch (event) {
2133         case NETDEV_REGISTER:
2134                 return netvsc_register_vf(event_dev);
2135         case NETDEV_UNREGISTER:
2136                 return netvsc_unregister_vf(event_dev);
2137         case NETDEV_UP:
2138         case NETDEV_DOWN:
2139                 return netvsc_vf_changed(event_dev);
2140         default:
2141                 return NOTIFY_DONE;
2142         }
2143 }
2144
2145 static struct notifier_block netvsc_netdev_notifier = {
2146         .notifier_call = netvsc_netdev_event,
2147 };
2148
2149 static void __exit netvsc_drv_exit(void)
2150 {
2151         unregister_netdevice_notifier(&netvsc_netdev_notifier);
2152         vmbus_driver_unregister(&netvsc_drv);
2153 }
2154
2155 static int __init netvsc_drv_init(void)
2156 {
2157         int ret;
2158
2159         if (ring_size < RING_SIZE_MIN) {
2160                 ring_size = RING_SIZE_MIN;
2161                 pr_info("Increased ring_size to %d (min allowed)\n",
2162                         ring_size);
2163         }
2164         ret = vmbus_driver_register(&netvsc_drv);
2165
2166         if (ret)
2167                 return ret;
2168
2169         register_netdevice_notifier(&netvsc_netdev_notifier);
2170         return 0;
2171 }
2172
2173 MODULE_LICENSE("GPL");
2174 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
2175
2176 module_init(netvsc_drv_init);
2177 module_exit(netvsc_drv_exit);