drivers/net/hyperv/netvsc.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/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/wait.h>
  25 #include <linux/mm.h>
  26 #include <linux/delay.h>
  27 #include <linux/io.h>
  28 #include <linux/slab.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/vmalloc.h>
  32 #include <asm/sync_bitops.h>
  33
  34 #include "hyperv_net.h"
  35
  36 /*
  37  * An API to support in-place processing of incoming VMBUS packets.
  38  */
  39 #define VMBUS_PKT_TRAILER       8
  40
  41 static struct vmpacket_descriptor *
  42 get_next_pkt_raw(struct vmbus_channel *channel)
  43 {
  44         struct hv_ring_buffer_info *ring_info = &channel->inbound;
  45         u32 read_loc = ring_info->priv_read_index;
  46         void *ring_buffer = hv_get_ring_buffer(ring_info);
  47         struct vmpacket_descriptor *cur_desc;
  48         u32 packetlen;
  49         u32 dsize = ring_info->ring_datasize;
  50         u32 delta = read_loc - ring_info->ring_buffer->read_index;
  51         u32 bytes_avail_toread = (hv_get_bytes_to_read(ring_info) - delta);
  52
  53         if (bytes_avail_toread < sizeof(struct vmpacket_descriptor))
  54                 return NULL;
  55
  56         if ((read_loc + sizeof(*cur_desc)) > dsize)
  57                 return NULL;
  58
  59         cur_desc = ring_buffer + read_loc;
  60         packetlen = cur_desc->len8 << 3;
  61
  62         /*
  63          * If the packet under consideration is wrapping around,
  64          * return failure.
  65          */
  66         if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > (dsize - 1))
  67                 return NULL;
  68
  69         return cur_desc;
  70 }
  71
  72 /*
  73  * A helper function to step through packets "in-place"
  74  * This API is to be called after each successful call
  75  * get_next_pkt_raw().
  76  */
  77 static void put_pkt_raw(struct vmbus_channel *channel,
  78                         struct vmpacket_descriptor *desc)
  79 {
  80         struct hv_ring_buffer_info *ring_info = &channel->inbound;
  81         u32 read_loc = ring_info->priv_read_index;
  82         u32 packetlen = desc->len8 << 3;
  83         u32 dsize = ring_info->ring_datasize;
  84
  85         BUG_ON((read_loc + packetlen + VMBUS_PKT_TRAILER) > dsize);
  86
  87         /*
  88          * Include the packet trailer.
  89          */
  90         ring_info->priv_read_index += packetlen + VMBUS_PKT_TRAILER;
  91 }
  92
  93 /*
  94  * This call commits the read index and potentially signals the host.
  95  * Here is the pattern for using the "in-place" consumption APIs:
  96  *
  97  * while (get_next_pkt_raw() {
  98  *      process the packet "in-place";
  99  *      put_pkt_raw();
 100  * }
 101  * if (packets processed in place)
 102  *      commit_rd_index();
 103  */
 104 static void commit_rd_index(struct vmbus_channel *channel)
 105 {
 106         struct hv_ring_buffer_info *ring_info = &channel->inbound;
 107         /*
 108          * Make sure all reads are done before we update the read index since
 109          * the writer may start writing to the read area once the read index
 110          * is updated.
 111          */
 112         virt_rmb();
 113         ring_info->ring_buffer->read_index = ring_info->priv_read_index;
 114
 115         if (hv_need_to_signal_on_read(ring_info))
 116                 vmbus_set_event(channel);
 117 }
 118
 119 /*
 120  * Switch the data path from the synthetic interface to the VF
 121  * interface.
 122  */
 123 void netvsc_switch_datapath(struct net_device *ndev, bool vf)
 124 {
 125         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 126         struct hv_device *dev = net_device_ctx->device_ctx;
 127         struct netvsc_device *nv_dev = net_device_ctx->nvdev;
 128         struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
 129
 130         memset(init_pkt, 0, sizeof(struct nvsp_message));
 131         init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
 132         if (vf)
 133                 init_pkt->msg.v4_msg.active_dp.active_datapath =
 134                         NVSP_DATAPATH_VF;
 135         else
 136                 init_pkt->msg.v4_msg.active_dp.active_datapath =
 137                         NVSP_DATAPATH_SYNTHETIC;
 138
 139         vmbus_sendpacket(dev->channel, init_pkt,
 140                                sizeof(struct nvsp_message),
 141                                (unsigned long)init_pkt,
 142                                VM_PKT_DATA_INBAND, 0);
 143 }
 144
 145 static struct netvsc_device *alloc_net_device(void)
 146 {
 147         struct netvsc_device *net_device;
 148
 149         net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
 150         if (!net_device)
 151                 return NULL;
 152
 153         net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL);
 154         if (!net_device->cb_buffer) {
 155                 kfree(net_device);
 156                 return NULL;
 157         }
 158
 159         net_device->mrc[0].buf = vzalloc(NETVSC_RECVSLOT_MAX *
 160                                          sizeof(struct recv_comp_data));
 161
 162         init_waitqueue_head(&net_device->wait_drain);
 163         net_device->destroy = false;
 164         atomic_set(&net_device->open_cnt, 0);
 165         net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
 166         net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
 167         init_completion(&net_device->channel_init_wait);
 168
 169         return net_device;
 170 }
 171
 172 static void free_netvsc_device(struct netvsc_device *nvdev)
 173 {
 174         int i;
 175
 176         for (i = 0; i < VRSS_CHANNEL_MAX; i++)
 177                 vfree(nvdev->mrc[i].buf);
 178
 179         kfree(nvdev->cb_buffer);
 180         kfree(nvdev);
 181 }
 182
 183 static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
 184 {
 185         struct netvsc_device *net_device = hv_device_to_netvsc_device(device);
 186
 187         if (net_device && net_device->destroy)
 188                 net_device = NULL;
 189
 190         return net_device;
 191 }
 192
 193 static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
 194 {
 195         struct netvsc_device *net_device = hv_device_to_netvsc_device(device);
 196
 197         if (!net_device)
 198                 goto get_in_err;
 199
 200         if (net_device->destroy &&
 201             atomic_read(&net_device->num_outstanding_sends) == 0 &&
 202             atomic_read(&net_device->num_outstanding_recvs) == 0)
 203                 net_device = NULL;
 204
 205 get_in_err:
 206         return net_device;
 207 }
 208
 209 static int netvsc_destroy_buf(struct hv_device *device)
 210 {
 211         struct nvsp_message *revoke_packet;
 212         int ret = 0;
 213         struct net_device *ndev = hv_get_drvdata(device);
 214         struct netvsc_device *net_device = net_device_to_netvsc_device(ndev);
 215
 216         /*
 217          * If we got a section count, it means we received a
 218          * SendReceiveBufferComplete msg (ie sent
 219          * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 220          * to send a revoke msg here
 221          */
 222         if (net_device->recv_section_cnt) {
 223                 /* Send the revoke receive buffer */
 224                 revoke_packet = &net_device->revoke_packet;
 225                 memset(revoke_packet, 0, sizeof(struct nvsp_message));
 226
 227                 revoke_packet->hdr.msg_type =
 228                         NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
 229                 revoke_packet->msg.v1_msg.
 230                 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
 231
 232                 ret = vmbus_sendpacket(device->channel,
 233                                        revoke_packet,
 234                                        sizeof(struct nvsp_message),
 235                                        (unsigned long)revoke_packet,
 236                                        VM_PKT_DATA_INBAND, 0);
 237                 /*
 238                  * If we failed here, we might as well return and
 239                  * have a leak rather than continue and a bugchk
 240                  */
 241                 if (ret != 0) {
 242                         netdev_err(ndev, "unable to send "
 243                                 "revoke receive buffer to netvsp\n");
 244                         return ret;
 245                 }
 246         }
 247
 248         /* Teardown the gpadl on the vsp end */
 249         if (net_device->recv_buf_gpadl_handle) {
 250                 ret = vmbus_teardown_gpadl(device->channel,
 251                                            net_device->recv_buf_gpadl_handle);
 252
 253                 /* If we failed here, we might as well return and have a leak
 254                  * rather than continue and a bugchk
 255                  */
 256                 if (ret != 0) {
 257                         netdev_err(ndev,
 258                                    "unable to teardown receive buffer's gpadl\n");
 259                         return ret;
 260                 }
 261                 net_device->recv_buf_gpadl_handle = 0;
 262         }
 263
 264         if (net_device->recv_buf) {
 265                 /* Free up the receive buffer */
 266                 vfree(net_device->recv_buf);
 267                 net_device->recv_buf = NULL;
 268         }
 269
 270         if (net_device->recv_section) {
 271                 net_device->recv_section_cnt = 0;
 272                 kfree(net_device->recv_section);
 273                 net_device->recv_section = NULL;
 274         }
 275
 276         /* Deal with the send buffer we may have setup.
 277          * If we got a  send section size, it means we received a
 278          * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
 279          * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
 280          * to send a revoke msg here
 281          */
 282         if (net_device->send_section_size) {
 283                 /* Send the revoke receive buffer */
 284                 revoke_packet = &net_device->revoke_packet;
 285                 memset(revoke_packet, 0, sizeof(struct nvsp_message));
 286
 287                 revoke_packet->hdr.msg_type =
 288                         NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
 289                 revoke_packet->msg.v1_msg.revoke_send_buf.id =
 290                         NETVSC_SEND_BUFFER_ID;
 291
 292                 ret = vmbus_sendpacket(device->channel,
 293                                        revoke_packet,
 294                                        sizeof(struct nvsp_message),
 295                                        (unsigned long)revoke_packet,
 296                                        VM_PKT_DATA_INBAND, 0);
 297                 /* If we failed here, we might as well return and
 298                  * have a leak rather than continue and a bugchk
 299                  */
 300                 if (ret != 0) {
 301                         netdev_err(ndev, "unable to send "
 302                                    "revoke send buffer to netvsp\n");
 303                         return ret;
 304                 }
 305         }
 306         /* Teardown the gpadl on the vsp end */
 307         if (net_device->send_buf_gpadl_handle) {
 308                 ret = vmbus_teardown_gpadl(device->channel,
 309                                            net_device->send_buf_gpadl_handle);
 310
 311                 /* If we failed here, we might as well return and have a leak
 312                  * rather than continue and a bugchk
 313                  */
 314                 if (ret != 0) {
 315                         netdev_err(ndev,
 316                                    "unable to teardown send buffer's gpadl\n");
 317                         return ret;
 318                 }
 319                 net_device->send_buf_gpadl_handle = 0;
 320         }
 321         if (net_device->send_buf) {
 322                 /* Free up the send buffer */
 323                 vfree(net_device->send_buf);
 324                 net_device->send_buf = NULL;
 325         }
 326         kfree(net_device->send_section_map);
 327
 328         return ret;
 329 }
 330
 331 static int netvsc_init_buf(struct hv_device *device)
 332 {
 333         int ret = 0;
 334         struct netvsc_device *net_device;
 335         struct nvsp_message *init_packet;
 336         struct net_device *ndev;
 337         int node;
 338
 339         net_device = get_outbound_net_device(device);
 340         if (!net_device)
 341                 return -ENODEV;
 342         ndev = hv_get_drvdata(device);
 343
 344         node = cpu_to_node(device->channel->target_cpu);
 345         net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node);
 346         if (!net_device->recv_buf)
 347                 net_device->recv_buf = vzalloc(net_device->recv_buf_size);
 348
 349         if (!net_device->recv_buf) {
 350                 netdev_err(ndev, "unable to allocate receive "
 351                         "buffer of size %d\n", net_device->recv_buf_size);
 352                 ret = -ENOMEM;
 353                 goto cleanup;
 354         }
 355
 356         /*
 357          * Establish the gpadl handle for this buffer on this
 358          * channel.  Note: This call uses the vmbus connection rather
 359          * than the channel to establish the gpadl handle.
 360          */
 361         ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
 362                                     net_device->recv_buf_size,
 363                                     &net_device->recv_buf_gpadl_handle);
 364         if (ret != 0) {
 365                 netdev_err(ndev,
 366                         "unable to establish receive buffer's gpadl\n");
 367                 goto cleanup;
 368         }
 369
 370         /* Notify the NetVsp of the gpadl handle */
 371         init_packet = &net_device->channel_init_pkt;
 372
 373         memset(init_packet, 0, sizeof(struct nvsp_message));
 374
 375         init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
 376         init_packet->msg.v1_msg.send_recv_buf.
 377                 gpadl_handle = net_device->recv_buf_gpadl_handle;
 378         init_packet->msg.v1_msg.
 379                 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
 380
 381         /* Send the gpadl notification request */
 382         ret = vmbus_sendpacket(device->channel, init_packet,
 383                                sizeof(struct nvsp_message),
 384                                (unsigned long)init_packet,
 385                                VM_PKT_DATA_INBAND,
 386                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 387         if (ret != 0) {
 388                 netdev_err(ndev,
 389                         "unable to send receive buffer's gpadl to netvsp\n");
 390                 goto cleanup;
 391         }
 392
 393         wait_for_completion(&net_device->channel_init_wait);
 394
 395         /* Check the response */
 396         if (init_packet->msg.v1_msg.
 397             send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
 398                 netdev_err(ndev, "Unable to complete receive buffer "
 399                            "initialization with NetVsp - status %d\n",
 400                            init_packet->msg.v1_msg.
 401                            send_recv_buf_complete.status);
 402                 ret = -EINVAL;
 403                 goto cleanup;
 404         }
 405
 406         /* Parse the response */
 407
 408         net_device->recv_section_cnt = init_packet->msg.
 409                 v1_msg.send_recv_buf_complete.num_sections;
 410
 411         net_device->recv_section = kmemdup(
 412                 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
 413                 net_device->recv_section_cnt *
 414                 sizeof(struct nvsp_1_receive_buffer_section),
 415                 GFP_KERNEL);
 416         if (net_device->recv_section == NULL) {
 417                 ret = -EINVAL;
 418                 goto cleanup;
 419         }
 420
 421         /*
 422          * For 1st release, there should only be 1 section that represents the
 423          * entire receive buffer
 424          */
 425         if (net_device->recv_section_cnt != 1 ||
 426             net_device->recv_section->offset != 0) {
 427                 ret = -EINVAL;
 428                 goto cleanup;
 429         }
 430
 431         /* Now setup the send buffer.
 432          */
 433         net_device->send_buf = vzalloc_node(net_device->send_buf_size, node);
 434         if (!net_device->send_buf)
 435                 net_device->send_buf = vzalloc(net_device->send_buf_size);
 436         if (!net_device->send_buf) {
 437                 netdev_err(ndev, "unable to allocate send "
 438                            "buffer of size %d\n", net_device->send_buf_size);
 439                 ret = -ENOMEM;
 440                 goto cleanup;
 441         }
 442
 443         /* Establish the gpadl handle for this buffer on this
 444          * channel.  Note: This call uses the vmbus connection rather
 445          * than the channel to establish the gpadl handle.
 446          */
 447         ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
 448                                     net_device->send_buf_size,
 449                                     &net_device->send_buf_gpadl_handle);
 450         if (ret != 0) {
 451                 netdev_err(ndev,
 452                            "unable to establish send buffer's gpadl\n");
 453                 goto cleanup;
 454         }
 455
 456         /* Notify the NetVsp of the gpadl handle */
 457         init_packet = &net_device->channel_init_pkt;
 458         memset(init_packet, 0, sizeof(struct nvsp_message));
 459         init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
 460         init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
 461                 net_device->send_buf_gpadl_handle;
 462         init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
 463
 464         /* Send the gpadl notification request */
 465         ret = vmbus_sendpacket(device->channel, init_packet,
 466                                sizeof(struct nvsp_message),
 467                                (unsigned long)init_packet,
 468                                VM_PKT_DATA_INBAND,
 469                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 470         if (ret != 0) {
 471                 netdev_err(ndev,
 472                            "unable to send send buffer's gpadl to netvsp\n");
 473                 goto cleanup;
 474         }
 475
 476         wait_for_completion(&net_device->channel_init_wait);
 477
 478         /* Check the response */
 479         if (init_packet->msg.v1_msg.
 480             send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
 481                 netdev_err(ndev, "Unable to complete send buffer "
 482                            "initialization with NetVsp - status %d\n",
 483                            init_packet->msg.v1_msg.
 484                            send_send_buf_complete.status);
 485                 ret = -EINVAL;
 486                 goto cleanup;
 487         }
 488
 489         /* Parse the response */
 490         net_device->send_section_size = init_packet->msg.
 491                                 v1_msg.send_send_buf_complete.section_size;
 492
 493         /* Section count is simply the size divided by the section size.
 494          */
 495         net_device->send_section_cnt =
 496                 net_device->send_buf_size / net_device->send_section_size;
 497
 498         dev_info(&device->device, "Send section size: %d, Section count:%d\n",
 499                  net_device->send_section_size, net_device->send_section_cnt);
 500
 501         /* Setup state for managing the send buffer. */
 502         net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
 503                                              BITS_PER_LONG);
 504
 505         net_device->send_section_map = kcalloc(net_device->map_words,
 506                                                sizeof(ulong), GFP_KERNEL);
 507         if (net_device->send_section_map == NULL) {
 508                 ret = -ENOMEM;
 509                 goto cleanup;
 510         }
 511
 512         goto exit;
 513
 514 cleanup:
 515         netvsc_destroy_buf(device);
 516
 517 exit:
 518         return ret;
 519 }
 520
 521 /* Negotiate NVSP protocol version */
 522 static int negotiate_nvsp_ver(struct hv_device *device,
 523                               struct netvsc_device *net_device,
 524                               struct nvsp_message *init_packet,
 525                               u32 nvsp_ver)
 526 {
 527         struct net_device *ndev = hv_get_drvdata(device);
 528         int ret;
 529
 530         memset(init_packet, 0, sizeof(struct nvsp_message));
 531         init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
 532         init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
 533         init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
 534
 535         /* Send the init request */
 536         ret = vmbus_sendpacket(device->channel, init_packet,
 537                                sizeof(struct nvsp_message),
 538                                (unsigned long)init_packet,
 539                                VM_PKT_DATA_INBAND,
 540                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 541
 542         if (ret != 0)
 543                 return ret;
 544
 545         wait_for_completion(&net_device->channel_init_wait);
 546
 547         if (init_packet->msg.init_msg.init_complete.status !=
 548             NVSP_STAT_SUCCESS)
 549                 return -EINVAL;
 550
 551         if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
 552                 return 0;
 553
 554         /* NVSPv2 or later: Send NDIS config */
 555         memset(init_packet, 0, sizeof(struct nvsp_message));
 556         init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
 557         init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
 558         init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
 559
 560         if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
 561                 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
 562
 563                 /* Teaming bit is needed to receive link speed updates */
 564                 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
 565         }
 566
 567         ret = vmbus_sendpacket(device->channel, init_packet,
 568                                 sizeof(struct nvsp_message),
 569                                 (unsigned long)init_packet,
 570                                 VM_PKT_DATA_INBAND, 0);
 571
 572         return ret;
 573 }
 574
 575 static int netvsc_connect_vsp(struct hv_device *device)
 576 {
 577         int ret;
 578         struct netvsc_device *net_device;
 579         struct nvsp_message *init_packet;
 580         int ndis_version;
 581         const u32 ver_list[] = {
 582                 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
 583                 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
 584         int i;
 585
 586         net_device = get_outbound_net_device(device);
 587         if (!net_device)
 588                 return -ENODEV;
 589
 590         init_packet = &net_device->channel_init_pkt;
 591
 592         /* Negotiate the latest NVSP protocol supported */
 593         for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
 594                 if (negotiate_nvsp_ver(device, net_device, init_packet,
 595                                        ver_list[i])  == 0) {
 596                         net_device->nvsp_version = ver_list[i];
 597                         break;
 598                 }
 599
 600         if (i < 0) {
 601                 ret = -EPROTO;
 602                 goto cleanup;
 603         }
 604
 605         pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
 606
 607         /* Send the ndis version */
 608         memset(init_packet, 0, sizeof(struct nvsp_message));
 609
 610         if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
 611                 ndis_version = 0x00060001;
 612         else
 613                 ndis_version = 0x0006001e;
 614
 615         init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
 616         init_packet->msg.v1_msg.
 617                 send_ndis_ver.ndis_major_ver =
 618                                 (ndis_version & 0xFFFF0000) >> 16;
 619         init_packet->msg.v1_msg.
 620                 send_ndis_ver.ndis_minor_ver =
 621                                 ndis_version & 0xFFFF;
 622
 623         /* Send the init request */
 624         ret = vmbus_sendpacket(device->channel, init_packet,
 625                                 sizeof(struct nvsp_message),
 626                                 (unsigned long)init_packet,
 627                                 VM_PKT_DATA_INBAND, 0);
 628         if (ret != 0)
 629                 goto cleanup;
 630
 631         /* Post the big receive buffer to NetVSP */
 632         if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
 633                 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
 634         else
 635                 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
 636         net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
 637
 638         ret = netvsc_init_buf(device);
 639
 640 cleanup:
 641         return ret;
 642 }
 643
 644 static void netvsc_disconnect_vsp(struct hv_device *device)
 645 {
 646         netvsc_destroy_buf(device);
 647 }
 648
 649 /*
 650  * netvsc_device_remove - Callback when the root bus device is removed
 651  */
 652 void netvsc_device_remove(struct hv_device *device)
 653 {
 654         struct net_device *ndev = hv_get_drvdata(device);
 655         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 656         struct netvsc_device *net_device = net_device_ctx->nvdev;
 657
 658         netvsc_disconnect_vsp(device);
 659
 660         net_device_ctx->nvdev = NULL;
 661
 662         /*
 663          * At this point, no one should be accessing net_device
 664          * except in here
 665          */
 666         dev_notice(&device->device, "net device safe to remove\n");
 667
 668         /* Now, we can close the channel safely */
 669         vmbus_close(device->channel);
 670
 671         /* Release all resources */
 672         vfree(net_device->sub_cb_buf);
 673         free_netvsc_device(net_device);
 674 }
 675
 676 #define RING_AVAIL_PERCENT_HIWATER 20
 677 #define RING_AVAIL_PERCENT_LOWATER 10
 678
 679 /*
 680  * Get the percentage of available bytes to write in the ring.
 681  * The return value is in range from 0 to 100.
 682  */
 683 static inline u32 hv_ringbuf_avail_percent(
 684                 struct hv_ring_buffer_info *ring_info)
 685 {
 686         u32 avail_read, avail_write;
 687
 688         hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
 689
 690         return avail_write * 100 / ring_info->ring_datasize;
 691 }
 692
 693 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
 694                                          u32 index)
 695 {
 696         sync_change_bit(index, net_device->send_section_map);
 697 }
 698
 699 static void netvsc_send_completion(struct netvsc_device *net_device,
 700                                    struct vmbus_channel *incoming_channel,
 701                                    struct hv_device *device,
 702                                    struct vmpacket_descriptor *packet)
 703 {
 704         struct nvsp_message *nvsp_packet;
 705         struct hv_netvsc_packet *nvsc_packet;
 706         struct net_device *ndev = hv_get_drvdata(device);
 707         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 708         u32 send_index;
 709         struct sk_buff *skb;
 710
 711         nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
 712                         (packet->offset8 << 3));
 713
 714         if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
 715             (nvsp_packet->hdr.msg_type ==
 716              NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
 717             (nvsp_packet->hdr.msg_type ==
 718              NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) ||
 719             (nvsp_packet->hdr.msg_type ==
 720              NVSP_MSG5_TYPE_SUBCHANNEL)) {
 721                 /* Copy the response back */
 722                 memcpy(&net_device->channel_init_pkt, nvsp_packet,
 723                        sizeof(struct nvsp_message));
 724                 complete(&net_device->channel_init_wait);
 725         } else if (nvsp_packet->hdr.msg_type ==
 726                    NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
 727                 int num_outstanding_sends;
 728                 u16 q_idx = 0;
 729                 struct vmbus_channel *channel = device->channel;
 730                 int queue_sends;
 731
 732                 /* Get the send context */
 733                 skb = (struct sk_buff *)(unsigned long)packet->trans_id;
 734
 735                 /* Notify the layer above us */
 736                 if (skb) {
 737                         nvsc_packet = (struct hv_netvsc_packet *) skb->cb;
 738                         send_index = nvsc_packet->send_buf_index;
 739                         if (send_index != NETVSC_INVALID_INDEX)
 740                                 netvsc_free_send_slot(net_device, send_index);
 741                         q_idx = nvsc_packet->q_idx;
 742                         channel = incoming_channel;
 743                         dev_kfree_skb_any(skb);
 744                 }
 745
 746                 num_outstanding_sends =
 747                         atomic_dec_return(&net_device->num_outstanding_sends);
 748                 queue_sends = atomic_dec_return(&net_device->
 749                                                 queue_sends[q_idx]);
 750
 751                 if (net_device->destroy && num_outstanding_sends == 0)
 752                         wake_up(&net_device->wait_drain);
 753
 754                 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
 755                     !net_device_ctx->start_remove &&
 756                     (hv_ringbuf_avail_percent(&channel->outbound) >
 757                      RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
 758                         netif_tx_wake_queue(netdev_get_tx_queue(ndev, q_idx));
 759         } else {
 760                 netdev_err(ndev, "Unknown send completion packet type- "
 761                            "%d received!!\n", nvsp_packet->hdr.msg_type);
 762         }
 763 }
 764
 765 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
 766 {
 767         unsigned long index;
 768         u32 max_words = net_device->map_words;
 769         unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
 770         u32 section_cnt = net_device->send_section_cnt;
 771         int ret_val = NETVSC_INVALID_INDEX;
 772         int i;
 773         int prev_val;
 774
 775         for (i = 0; i < max_words; i++) {
 776                 if (!~(map_addr[i]))
 777                         continue;
 778                 index = ffz(map_addr[i]);
 779                 prev_val = sync_test_and_set_bit(index, &map_addr[i]);
 780                 if (prev_val)
 781                         continue;
 782                 if ((index + (i * BITS_PER_LONG)) >= section_cnt)
 783                         break;
 784                 ret_val = (index + (i * BITS_PER_LONG));
 785                 break;
 786         }
 787         return ret_val;
 788 }
 789
 790 static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
 791                                    unsigned int section_index,
 792                                    u32 pend_size,
 793                                    struct hv_netvsc_packet *packet,
 794                                    struct rndis_message *rndis_msg,
 795                                    struct hv_page_buffer **pb,
 796                                    struct sk_buff *skb)
 797 {
 798         char *start = net_device->send_buf;
 799         char *dest = start + (section_index * net_device->send_section_size)
 800                      + pend_size;
 801         int i;
 802         bool is_data_pkt = (skb != NULL) ? true : false;
 803         bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
 804         u32 msg_size = 0;
 805         u32 padding = 0;
 806         u32 remain = packet->total_data_buflen % net_device->pkt_align;
 807         u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
 808                 packet->page_buf_cnt;
 809
 810         /* Add padding */
 811         if (is_data_pkt && xmit_more && remain &&
 812             !packet->cp_partial) {
 813                 padding = net_device->pkt_align - remain;
 814                 rndis_msg->msg_len += padding;
 815                 packet->total_data_buflen += padding;
 816         }
 817
 818         for (i = 0; i < page_count; i++) {
 819                 char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT);
 820                 u32 offset = (*pb)[i].offset;
 821                 u32 len = (*pb)[i].len;
 822
 823                 memcpy(dest, (src + offset), len);
 824                 msg_size += len;
 825                 dest += len;
 826         }
 827
 828         if (padding) {
 829                 memset(dest, 0, padding);
 830                 msg_size += padding;
 831         }
 832
 833         return msg_size;
 834 }
 835
 836 static int netvsc_send_pkt(
 837         struct hv_device *device,
 838         struct hv_netvsc_packet *packet,
 839         struct netvsc_device *net_device,
 840         struct hv_page_buffer **pb,
 841         struct sk_buff *skb)
 842 {
 843         struct nvsp_message nvmsg;
 844         u16 q_idx = packet->q_idx;
 845         struct vmbus_channel *out_channel = net_device->chn_table[q_idx];
 846         struct net_device *ndev = hv_get_drvdata(device);
 847         u64 req_id;
 848         int ret;
 849         struct hv_page_buffer *pgbuf;
 850         u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
 851         bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
 852
 853         nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
 854         if (skb != NULL) {
 855                 /* 0 is RMC_DATA; */
 856                 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0;
 857         } else {
 858                 /* 1 is RMC_CONTROL; */
 859                 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1;
 860         }
 861
 862         nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
 863                 packet->send_buf_index;
 864         if (packet->send_buf_index == NETVSC_INVALID_INDEX)
 865                 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
 866         else
 867                 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size =
 868                         packet->total_data_buflen;
 869
 870         req_id = (ulong)skb;
 871
 872         if (out_channel->rescind)
 873                 return -ENODEV;
 874
 875         /*
 876          * It is possible that once we successfully place this packet
 877          * on the ringbuffer, we may stop the queue. In that case, we want
 878          * to notify the host independent of the xmit_more flag. We don't
 879          * need to be precise here; in the worst case we may signal the host
 880          * unnecessarily.
 881          */
 882         if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1))
 883                 xmit_more = false;
 884
 885         if (packet->page_buf_cnt) {
 886                 pgbuf = packet->cp_partial ? (*pb) +
 887                         packet->rmsg_pgcnt : (*pb);
 888                 ret = vmbus_sendpacket_pagebuffer_ctl(out_channel,
 889                                                       pgbuf,
 890                                                       packet->page_buf_cnt,
 891                                                       &nvmsg,
 892                                                       sizeof(struct nvsp_message),
 893                                                       req_id,
 894                                                       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
 895                                                       !xmit_more);
 896         } else {
 897                 ret = vmbus_sendpacket_ctl(out_channel, &nvmsg,
 898                                            sizeof(struct nvsp_message),
 899                                            req_id,
 900                                            VM_PKT_DATA_INBAND,
 901                                            VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
 902                                            !xmit_more);
 903         }
 904
 905         if (ret == 0) {
 906                 atomic_inc(&net_device->num_outstanding_sends);
 907                 atomic_inc(&net_device->queue_sends[q_idx]);
 908
 909                 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
 910                         netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx));
 911
 912                         if (atomic_read(&net_device->
 913                                 queue_sends[q_idx]) < 1)
 914                                 netif_tx_wake_queue(netdev_get_tx_queue(
 915                                                     ndev, q_idx));
 916                 }
 917         } else if (ret == -EAGAIN) {
 918                 netif_tx_stop_queue(netdev_get_tx_queue(
 919                                     ndev, q_idx));
 920                 if (atomic_read(&net_device->queue_sends[q_idx]) < 1) {
 921                         netif_tx_wake_queue(netdev_get_tx_queue(
 922                                             ndev, q_idx));
 923                         ret = -ENOSPC;
 924                 }
 925         } else {
 926                 netdev_err(ndev, "Unable to send packet %p ret %d\n",
 927                            packet, ret);
 928         }
 929
 930         return ret;
 931 }
 932
 933 /* Move packet out of multi send data (msd), and clear msd */
 934 static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
 935                                 struct sk_buff **msd_skb,
 936                                 struct multi_send_data *msdp)
 937 {
 938         *msd_skb = msdp->skb;
 939         *msd_send = msdp->pkt;
 940         msdp->skb = NULL;
 941         msdp->pkt = NULL;
 942         msdp->count = 0;
 943 }
 944
 945 int netvsc_send(struct hv_device *device,
 946                 struct hv_netvsc_packet *packet,
 947                 struct rndis_message *rndis_msg,
 948                 struct hv_page_buffer **pb,
 949                 struct sk_buff *skb)
 950 {
 951         struct netvsc_device *net_device;
 952         int ret = 0, m_ret = 0;
 953         struct vmbus_channel *out_channel;
 954         u16 q_idx = packet->q_idx;
 955         u32 pktlen = packet->total_data_buflen, msd_len = 0;
 956         unsigned int section_index = NETVSC_INVALID_INDEX;
 957         struct multi_send_data *msdp;
 958         struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
 959         struct sk_buff *msd_skb = NULL;
 960         bool try_batch;
 961         bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
 962
 963         net_device = get_outbound_net_device(device);
 964         if (!net_device)
 965                 return -ENODEV;
 966
 967         out_channel = net_device->chn_table[q_idx];
 968
 969         packet->send_buf_index = NETVSC_INVALID_INDEX;
 970         packet->cp_partial = false;
 971
 972         /* Send control message directly without accessing msd (Multi-Send
 973          * Data) field which may be changed during data packet processing.
 974          */
 975         if (!skb) {
 976                 cur_send = packet;
 977                 goto send_now;
 978         }
 979
 980         msdp = &net_device->msd[q_idx];
 981
 982         /* batch packets in send buffer if possible */
 983         if (msdp->pkt)
 984                 msd_len = msdp->pkt->total_data_buflen;
 985
 986         try_batch = (skb != NULL) && msd_len > 0 && msdp->count <
 987                     net_device->max_pkt;
 988
 989         if (try_batch && msd_len + pktlen + net_device->pkt_align <
 990             net_device->send_section_size) {
 991                 section_index = msdp->pkt->send_buf_index;
 992
 993         } else if (try_batch && msd_len + packet->rmsg_size <
 994                    net_device->send_section_size) {
 995                 section_index = msdp->pkt->send_buf_index;
 996                 packet->cp_partial = true;
 997
 998         } else if ((skb != NULL) && pktlen + net_device->pkt_align <
 999                    net_device->send_section_size) {
1000                 section_index = netvsc_get_next_send_section(net_device);
1001                 if (section_index != NETVSC_INVALID_INDEX) {
1002                         move_pkt_msd(&msd_send, &msd_skb, msdp);
1003                         msd_len = 0;
1004                 }
1005         }
1006
1007         if (section_index != NETVSC_INVALID_INDEX) {
1008                 netvsc_copy_to_send_buf(net_device,
1009                                         section_index, msd_len,
1010                                         packet, rndis_msg, pb, skb);
1011
1012                 packet->send_buf_index = section_index;
1013
1014                 if (packet->cp_partial) {
1015                         packet->page_buf_cnt -= packet->rmsg_pgcnt;
1016                         packet->total_data_buflen = msd_len + packet->rmsg_size;
1017                 } else {
1018                         packet->page_buf_cnt = 0;
1019                         packet->total_data_buflen += msd_len;
1020                 }
1021
1022                 if (msdp->skb)
1023                         dev_kfree_skb_any(msdp->skb);
1024
1025                 if (xmit_more && !packet->cp_partial) {
1026                         msdp->skb = skb;
1027                         msdp->pkt = packet;
1028                         msdp->count++;
1029                 } else {
1030                         cur_send = packet;
1031                         msdp->skb = NULL;
1032                         msdp->pkt = NULL;
1033                         msdp->count = 0;
1034                 }
1035         } else {
1036                 move_pkt_msd(&msd_send, &msd_skb, msdp);
1037                 cur_send = packet;
1038         }
1039
1040         if (msd_send) {
1041                 m_ret = netvsc_send_pkt(device, msd_send, net_device,
1042                                         NULL, msd_skb);
1043
1044                 if (m_ret != 0) {
1045                         netvsc_free_send_slot(net_device,
1046                                               msd_send->send_buf_index);
1047                         dev_kfree_skb_any(msd_skb);
1048                 }
1049         }
1050
1051 send_now:
1052         if (cur_send)
1053                 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1054
1055         if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1056                 netvsc_free_send_slot(net_device, section_index);
1057
1058         return ret;
1059 }
1060
1061 static int netvsc_send_recv_completion(struct vmbus_channel *channel,
1062                                        u64 transaction_id, u32 status)
1063 {
1064         struct nvsp_message recvcompMessage;
1065         int ret;
1066
1067         recvcompMessage.hdr.msg_type =
1068                                 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
1069
1070         recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
1071
1072         /* Send the completion */
1073         ret = vmbus_sendpacket(channel, &recvcompMessage,
1074                                sizeof(struct nvsp_message_header) + sizeof(u32),
1075                                transaction_id, VM_PKT_COMP, 0);
1076
1077         return ret;
1078 }
1079
1080 static inline void count_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx,
1081                                         u32 *filled, u32 *avail)
1082 {
1083         u32 first = nvdev->mrc[q_idx].first;
1084         u32 next = nvdev->mrc[q_idx].next;
1085
1086         *filled = (first > next) ? NETVSC_RECVSLOT_MAX - first + next :
1087                   next - first;
1088
1089         *avail = NETVSC_RECVSLOT_MAX - *filled - 1;
1090 }
1091
1092 /* Read the first filled slot, no change to index */
1093 static inline struct recv_comp_data *read_recv_comp_slot(struct netvsc_device
1094                                                          *nvdev, u16 q_idx)
1095 {
1096         u32 filled, avail;
1097
1098         if (!nvdev->mrc[q_idx].buf)
1099                 return NULL;
1100
1101         count_recv_comp_slot(nvdev, q_idx, &filled, &avail);
1102         if (!filled)
1103                 return NULL;
1104
1105         return nvdev->mrc[q_idx].buf + nvdev->mrc[q_idx].first *
1106                sizeof(struct recv_comp_data);
1107 }
1108
1109 /* Put the first filled slot back to available pool */
1110 static inline void put_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx)
1111 {
1112         int num_recv;
1113
1114         nvdev->mrc[q_idx].first = (nvdev->mrc[q_idx].first + 1) %
1115                                   NETVSC_RECVSLOT_MAX;
1116
1117         num_recv = atomic_dec_return(&nvdev->num_outstanding_recvs);
1118
1119         if (nvdev->destroy && num_recv == 0)
1120                 wake_up(&nvdev->wait_drain);
1121 }
1122
1123 /* Check and send pending recv completions */
1124 static void netvsc_chk_recv_comp(struct netvsc_device *nvdev,
1125                                  struct vmbus_channel *channel, u16 q_idx)
1126 {
1127         struct recv_comp_data *rcd;
1128         int ret;
1129
1130         while (true) {
1131                 rcd = read_recv_comp_slot(nvdev, q_idx);
1132                 if (!rcd)
1133                         break;
1134
1135                 ret = netvsc_send_recv_completion(channel, rcd->tid,
1136                                                   rcd->status);
1137                 if (ret)
1138                         break;
1139
1140                 put_recv_comp_slot(nvdev, q_idx);
1141         }
1142 }
1143
1144 #define NETVSC_RCD_WATERMARK 80
1145
1146 /* Get next available slot */
1147 static inline struct recv_comp_data *get_recv_comp_slot(
1148         struct netvsc_device *nvdev, struct vmbus_channel *channel, u16 q_idx)
1149 {
1150         u32 filled, avail, next;
1151         struct recv_comp_data *rcd;
1152
1153         if (!nvdev->recv_section)
1154                 return NULL;
1155
1156         if (!nvdev->mrc[q_idx].buf)
1157                 return NULL;
1158
1159         if (atomic_read(&nvdev->num_outstanding_recvs) >
1160             nvdev->recv_section->num_sub_allocs * NETVSC_RCD_WATERMARK / 100)
1161                 netvsc_chk_recv_comp(nvdev, channel, q_idx);
1162
1163         count_recv_comp_slot(nvdev, q_idx, &filled, &avail);
1164         if (!avail)
1165                 return NULL;
1166
1167         next = nvdev->mrc[q_idx].next;
1168         rcd = nvdev->mrc[q_idx].buf + next * sizeof(struct recv_comp_data);
1169         nvdev->mrc[q_idx].next = (next + 1) % NETVSC_RECVSLOT_MAX;
1170
1171         atomic_inc(&nvdev->num_outstanding_recvs);
1172
1173         return rcd;
1174 }
1175
1176 static void netvsc_receive(struct netvsc_device *net_device,
1177                         struct vmbus_channel *channel,
1178                         struct hv_device *device,
1179                         struct vmpacket_descriptor *packet)
1180 {
1181         struct vmtransfer_page_packet_header *vmxferpage_packet;
1182         struct nvsp_message *nvsp_packet;
1183         struct hv_netvsc_packet nv_pkt;
1184         struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
1185         u32 status = NVSP_STAT_SUCCESS;
1186         int i;
1187         int count = 0;
1188         struct net_device *ndev = hv_get_drvdata(device);
1189         void *data;
1190         int ret;
1191         struct recv_comp_data *rcd;
1192         u16 q_idx = channel->offermsg.offer.sub_channel_index;
1193
1194         /*
1195          * All inbound packets other than send completion should be xfer page
1196          * packet
1197          */
1198         if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
1199                 netdev_err(ndev, "Unknown packet type received - %d\n",
1200                            packet->type);
1201                 return;
1202         }
1203
1204         nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
1205                         (packet->offset8 << 3));
1206
1207         /* Make sure this is a valid nvsp packet */
1208         if (nvsp_packet->hdr.msg_type !=
1209             NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
1210                 netdev_err(ndev, "Unknown nvsp packet type received-"
1211                         " %d\n", nvsp_packet->hdr.msg_type);
1212                 return;
1213         }
1214
1215         vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
1216
1217         if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
1218                 netdev_err(ndev, "Invalid xfer page set id - "
1219                            "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
1220                            vmxferpage_packet->xfer_pageset_id);
1221                 return;
1222         }
1223
1224         count = vmxferpage_packet->range_cnt;
1225
1226         /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1227         for (i = 0; i < count; i++) {
1228                 /* Initialize the netvsc packet */
1229                 data = (void *)((unsigned long)net_device->
1230                         recv_buf + vmxferpage_packet->ranges[i].byte_offset);
1231                 netvsc_packet->total_data_buflen =
1232                                         vmxferpage_packet->ranges[i].byte_count;
1233
1234                 /* Pass it to the upper layer */
1235                 status = rndis_filter_receive(device, netvsc_packet, &data,
1236                                               channel);
1237         }
1238
1239         if (!net_device->mrc[q_idx].buf) {
1240                 ret = netvsc_send_recv_completion(channel,
1241                                                   vmxferpage_packet->d.trans_id,
1242                                                   status);
1243                 if (ret)
1244                         netdev_err(ndev, "Recv_comp q:%hd, tid:%llx, err:%d\n",
1245                                    q_idx, vmxferpage_packet->d.trans_id, ret);
1246                 return;
1247         }
1248
1249         rcd = get_recv_comp_slot(net_device, channel, q_idx);
1250
1251         if (!rcd) {
1252                 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1253                            q_idx, vmxferpage_packet->d.trans_id);
1254                 return;
1255         }
1256
1257         rcd->tid = vmxferpage_packet->d.trans_id;
1258         rcd->status = status;
1259 }
1260
1261 static void netvsc_send_table(struct hv_device *hdev,
1262                               struct nvsp_message *nvmsg)
1263 {
1264         struct netvsc_device *nvscdev;
1265         struct net_device *ndev = hv_get_drvdata(hdev);
1266         int i;
1267         u32 count, *tab;
1268
1269         nvscdev = get_outbound_net_device(hdev);
1270         if (!nvscdev)
1271                 return;
1272
1273         count = nvmsg->msg.v5_msg.send_table.count;
1274         if (count != VRSS_SEND_TAB_SIZE) {
1275                 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1276                 return;
1277         }
1278
1279         tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
1280                       nvmsg->msg.v5_msg.send_table.offset);
1281
1282         for (i = 0; i < count; i++)
1283                 nvscdev->send_table[i] = tab[i];
1284 }
1285
1286 static void netvsc_send_vf(struct net_device_context *net_device_ctx,
1287                            struct nvsp_message *nvmsg)
1288 {
1289         net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1290         net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1291 }
1292
1293 static inline void netvsc_receive_inband(struct hv_device *hdev,
1294                                  struct net_device_context *net_device_ctx,
1295                                  struct nvsp_message *nvmsg)
1296 {
1297         switch (nvmsg->hdr.msg_type) {
1298         case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1299                 netvsc_send_table(hdev, nvmsg);
1300                 break;
1301
1302         case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1303                 netvsc_send_vf(net_device_ctx, nvmsg);
1304                 break;
1305         }
1306 }
1307
1308 static void netvsc_process_raw_pkt(struct hv_device *device,
1309                                    struct vmbus_channel *channel,
1310                                    struct netvsc_device *net_device,
1311                                    struct net_device *ndev,
1312                                    u64 request_id,
1313                                    struct vmpacket_descriptor *desc)
1314 {
1315         struct nvsp_message *nvmsg;
1316         struct net_device_context *net_device_ctx = netdev_priv(ndev);
1317
1318         nvmsg = (struct nvsp_message *)((unsigned long)
1319                 desc + (desc->offset8 << 3));
1320
1321         switch (desc->type) {
1322         case VM_PKT_COMP:
1323                 netvsc_send_completion(net_device, channel, device, desc);
1324                 break;
1325
1326         case VM_PKT_DATA_USING_XFER_PAGES:
1327                 netvsc_receive(net_device, channel, device, desc);
1328                 break;
1329
1330         case VM_PKT_DATA_INBAND:
1331                 netvsc_receive_inband(device, net_device_ctx, nvmsg);
1332                 break;
1333
1334         default:
1335                 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1336                            desc->type, request_id);
1337                 break;
1338         }
1339 }
1340
1341 void netvsc_channel_cb(void *context)
1342 {
1343         int ret;
1344         struct vmbus_channel *channel = (struct vmbus_channel *)context;
1345         u16 q_idx = channel->offermsg.offer.sub_channel_index;
1346         struct hv_device *device;
1347         struct netvsc_device *net_device;
1348         u32 bytes_recvd;
1349         u64 request_id;
1350         struct vmpacket_descriptor *desc;
1351         unsigned char *buffer;
1352         int bufferlen = NETVSC_PACKET_SIZE;
1353         struct net_device *ndev;
1354         bool need_to_commit = false;
1355
1356         if (channel->primary_channel != NULL)
1357                 device = channel->primary_channel->device_obj;
1358         else
1359                 device = channel->device_obj;
1360
1361         net_device = get_inbound_net_device(device);
1362         if (!net_device)
1363                 return;
1364         ndev = hv_get_drvdata(device);
1365         buffer = get_per_channel_state(channel);
1366
1367         do {
1368                 desc = get_next_pkt_raw(channel);
1369                 if (desc != NULL) {
1370                         netvsc_process_raw_pkt(device,
1371                                                channel,
1372                                                net_device,
1373                                                ndev,
1374                                                desc->trans_id,
1375                                                desc);
1376
1377                         put_pkt_raw(channel, desc);
1378                         need_to_commit = true;
1379                         continue;
1380                 }
1381                 if (need_to_commit) {
1382                         need_to_commit = false;
1383                         commit_rd_index(channel);
1384                 }
1385
1386                 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
1387                                            &bytes_recvd, &request_id);
1388                 if (ret == 0) {
1389                         if (bytes_recvd > 0) {
1390                                 desc = (struct vmpacket_descriptor *)buffer;
1391                                 netvsc_process_raw_pkt(device,
1392                                                        channel,
1393                                                        net_device,
1394                                                        ndev,
1395                                                        request_id,
1396                                                        desc);
1397                         } else {
1398                                 /*
1399                                  * We are done for this pass.
1400                                  */
1401                                 break;
1402                         }
1403
1404                 } else if (ret == -ENOBUFS) {
1405                         if (bufferlen > NETVSC_PACKET_SIZE)
1406                                 kfree(buffer);
1407                         /* Handle large packet */
1408                         buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
1409                         if (buffer == NULL) {
1410                                 /* Try again next time around */
1411                                 netdev_err(ndev,
1412                                            "unable to allocate buffer of size "
1413                                            "(%d)!!\n", bytes_recvd);
1414                                 break;
1415                         }
1416
1417                         bufferlen = bytes_recvd;
1418                 }
1419         } while (1);
1420
1421         if (bufferlen > NETVSC_PACKET_SIZE)
1422                 kfree(buffer);
1423
1424         netvsc_chk_recv_comp(net_device, channel, q_idx);
1425 }
1426
1427 /*
1428  * netvsc_device_add - Callback when the device belonging to this
1429  * driver is added
1430  */
1431 int netvsc_device_add(struct hv_device *device, void *additional_info)
1432 {
1433         int i, ret = 0;
1434         int ring_size =
1435         ((struct netvsc_device_info *)additional_info)->ring_size;
1436         struct netvsc_device *net_device;
1437         struct net_device *ndev = hv_get_drvdata(device);
1438         struct net_device_context *net_device_ctx = netdev_priv(ndev);
1439
1440         net_device = alloc_net_device();
1441         if (!net_device)
1442                 return -ENOMEM;
1443
1444         net_device->ring_size = ring_size;
1445
1446         set_per_channel_state(device->channel, net_device->cb_buffer);
1447
1448         /* Open the channel */
1449         ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
1450                          ring_size * PAGE_SIZE, NULL, 0,
1451                          netvsc_channel_cb, device->channel);
1452
1453         if (ret != 0) {
1454                 netdev_err(ndev, "unable to open channel: %d\n", ret);
1455                 goto cleanup;
1456         }
1457
1458         /* Channel is opened */
1459         pr_info("hv_netvsc channel opened successfully\n");
1460
1461         /* If we're reopening the device we may have multiple queues, fill the
1462          * chn_table with the default channel to use it before subchannels are
1463          * opened.
1464          */
1465         for (i = 0; i < VRSS_CHANNEL_MAX; i++)
1466                 net_device->chn_table[i] = device->channel;
1467
1468         /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1469          * populated.
1470          */
1471         wmb();
1472
1473         net_device_ctx->nvdev = net_device;
1474
1475         /* Connect with the NetVsp */
1476         ret = netvsc_connect_vsp(device);
1477         if (ret != 0) {
1478                 netdev_err(ndev,
1479                         "unable to connect to NetVSP - %d\n", ret);
1480                 goto close;
1481         }
1482
1483         return ret;
1484
1485 close:
1486         /* Now, we can close the channel safely */
1487         vmbus_close(device->channel);
1488
1489 cleanup:
1490         free_netvsc_device(net_device);
1491
1492         return ret;
1493 }