drivers/staging/hv/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, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Authors:
  18  *   Haiyang Zhang <haiyangz@microsoft.com>
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/mm.h>
  23 #include <linux/delay.h>
  24 #include <linux/io.h>
  25 #include <linux/slab.h>
  26 #include "osd.h"
  27 #include "logging.h"
  28 #include "netvsc.h"
  29 #include "rndis_filter.h"
  30 #include "channel.h"
  31
  32
  33 /* Globals */
  34 static const char *gDriverName = "netvsc";
  35
  36 /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  37 static const struct hv_guid gNetVscDeviceType = {
  38         .data = {
  39                 0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  40                 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  41         }
  42 };
  43
  44 static int NetVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo);
  45
  46 static int NetVscOnDeviceRemove(struct hv_device *Device);
  47
  48 static void NetVscOnCleanup(struct hv_driver *Driver);
  49
  50 static void NetVscOnChannelCallback(void *context);
  51
  52 static int NetVscInitializeSendBufferWithNetVsp(struct hv_device *Device);
  53
  54 static int NetVscInitializeReceiveBufferWithNetVsp(struct hv_device *Device);
  55
  56 static int NetVscDestroySendBuffer(struct netvsc_device *NetDevice);
  57
  58 static int NetVscDestroyReceiveBuffer(struct netvsc_device *NetDevice);
  59
  60 static int NetVscConnectToVsp(struct hv_device *Device);
  61
  62 static void NetVscOnSendCompletion(struct hv_device *Device,
  63                                    struct vmpacket_descriptor *Packet);
  64
  65 static int NetVscOnSend(struct hv_device *Device,
  66                         struct hv_netvsc_packet *Packet);
  67
  68 static void NetVscOnReceive(struct hv_device *Device,
  69                             struct vmpacket_descriptor *Packet);
  70
  71 static void NetVscOnReceiveCompletion(void *Context);
  72
  73 static void NetVscSendReceiveCompletion(struct hv_device *Device,
  74                                         u64 TransactionId);
  75
  76
  77 static struct netvsc_device *AllocNetDevice(struct hv_device *Device)
  78 {
  79         struct netvsc_device *netDevice;
  80
  81         netDevice = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
  82         if (!netDevice)
  83                 return NULL;
  84
  85         /* Set to 2 to allow both inbound and outbound traffic */
  86         atomic_cmpxchg(&netDevice->RefCount, 0, 2);
  87
  88         netDevice->Device = Device;
  89         Device->Extension = netDevice;
  90
  91         return netDevice;
  92 }
  93
  94 static void FreeNetDevice(struct netvsc_device *Device)
  95 {
  96         WARN_ON(atomic_read(&Device->RefCount) == 0);
  97         Device->Device->Extension = NULL;
  98         kfree(Device);
  99 }
 100
 101
 102 /* Get the net device object iff exists and its refcount > 1 */
 103 static struct netvsc_device *GetOutboundNetDevice(struct hv_device *Device)
 104 {
 105         struct netvsc_device *netDevice;
 106
 107         netDevice = Device->Extension;
 108         if (netDevice && atomic_read(&netDevice->RefCount) > 1)
 109                 atomic_inc(&netDevice->RefCount);
 110         else
 111                 netDevice = NULL;
 112
 113         return netDevice;
 114 }
 115
 116 /* Get the net device object iff exists and its refcount > 0 */
 117 static struct netvsc_device *GetInboundNetDevice(struct hv_device *Device)
 118 {
 119         struct netvsc_device *netDevice;
 120
 121         netDevice = Device->Extension;
 122         if (netDevice && atomic_read(&netDevice->RefCount))
 123                 atomic_inc(&netDevice->RefCount);
 124         else
 125                 netDevice = NULL;
 126
 127         return netDevice;
 128 }
 129
 130 static void PutNetDevice(struct hv_device *Device)
 131 {
 132         struct netvsc_device *netDevice;
 133
 134         netDevice = Device->Extension;
 135         /* ASSERT(netDevice); */
 136
 137         atomic_dec(&netDevice->RefCount);
 138 }
 139
 140 static struct netvsc_device *ReleaseOutboundNetDevice(struct hv_device *Device)
 141 {
 142         struct netvsc_device *netDevice;
 143
 144         netDevice = Device->Extension;
 145         if (netDevice == NULL)
 146                 return NULL;
 147
 148         /* Busy wait until the ref drop to 2, then set it to 1 */
 149         while (atomic_cmpxchg(&netDevice->RefCount, 2, 1) != 2)
 150                 udelay(100);
 151
 152         return netDevice;
 153 }
 154
 155 static struct netvsc_device *ReleaseInboundNetDevice(struct hv_device *Device)
 156 {
 157         struct netvsc_device *netDevice;
 158
 159         netDevice = Device->Extension;
 160         if (netDevice == NULL)
 161                 return NULL;
 162
 163         /* Busy wait until the ref drop to 1, then set it to 0 */
 164         while (atomic_cmpxchg(&netDevice->RefCount, 1, 0) != 1)
 165                 udelay(100);
 166
 167         Device->Extension = NULL;
 168         return netDevice;
 169 }
 170
 171 /*
 172  * NetVscInitialize - Main entry point
 173  */
 174 int NetVscInitialize(struct hv_driver *drv)
 175 {
 176         struct netvsc_driver *driver = (struct netvsc_driver *)drv;
 177
 178         DPRINT_DBG(NETVSC, "sizeof(struct hv_netvsc_packet)=%zd, "
 179                    "sizeof(struct nvsp_message)=%zd, "
 180                    "sizeof(struct vmtransfer_page_packet_header)=%zd",
 181                    sizeof(struct hv_netvsc_packet),
 182                    sizeof(struct nvsp_message),
 183                    sizeof(struct vmtransfer_page_packet_header));
 184
 185         /* Make sure we are at least 2 pages since 1 page is used for control */
 186         /* ASSERT(driver->RingBufferSize >= (PAGE_SIZE << 1)); */
 187
 188         drv->name = gDriverName;
 189         memcpy(&drv->deviceType, &gNetVscDeviceType, sizeof(struct hv_guid));
 190
 191         /* Make sure it is set by the caller */
 192         /* FIXME: These probably should still be tested in some way */
 193         /* ASSERT(driver->OnReceiveCallback); */
 194         /* ASSERT(driver->OnLinkStatusChanged); */
 195
 196         /* Setup the dispatch table */
 197         driver->Base.OnDeviceAdd        = NetVscOnDeviceAdd;
 198         driver->Base.OnDeviceRemove     = NetVscOnDeviceRemove;
 199         driver->Base.OnCleanup          = NetVscOnCleanup;
 200
 201         driver->OnSend                  = NetVscOnSend;
 202
 203         RndisFilterInit(driver);
 204         return 0;
 205 }
 206
 207 static int NetVscInitializeReceiveBufferWithNetVsp(struct hv_device *Device)
 208 {
 209         int ret = 0;
 210         struct netvsc_device *netDevice;
 211         struct nvsp_message *initPacket;
 212
 213         netDevice = GetOutboundNetDevice(Device);
 214         if (!netDevice) {
 215                 DPRINT_ERR(NETVSC, "unable to get net device..."
 216                            "device being destroyed?");
 217                 return -1;
 218         }
 219         /* ASSERT(netDevice->ReceiveBufferSize > 0); */
 220         /* page-size grandularity */
 221         /* ASSERT((netDevice->ReceiveBufferSize & (PAGE_SIZE - 1)) == 0); */
 222
 223         netDevice->ReceiveBuffer =
 224                 osd_PageAlloc(netDevice->ReceiveBufferSize >> PAGE_SHIFT);
 225         if (!netDevice->ReceiveBuffer) {
 226                 DPRINT_ERR(NETVSC,
 227                            "unable to allocate receive buffer of size %d",
 228                            netDevice->ReceiveBufferSize);
 229                 ret = -1;
 230                 goto Cleanup;
 231         }
 232         /* page-aligned buffer */
 233         /* ASSERT(((unsigned long)netDevice->ReceiveBuffer & (PAGE_SIZE - 1)) == */
 234         /*      0); */
 235
 236         DPRINT_INFO(NETVSC, "Establishing receive buffer's GPADL...");
 237
 238         /*
 239          * Establish the gpadl handle for this buffer on this
 240          * channel.  Note: This call uses the vmbus connection rather
 241          * than the channel to establish the gpadl handle.
 242          */
 243         ret = vmbus_establish_gpadl(Device->channel, netDevice->ReceiveBuffer,
 244                                     netDevice->ReceiveBufferSize,
 245                                     &netDevice->ReceiveBufferGpadlHandle);
 246         if (ret != 0) {
 247                 DPRINT_ERR(NETVSC,
 248                            "unable to establish receive buffer's gpadl");
 249                 goto Cleanup;
 250         }
 251
 252         /* osd_WaitEventWait(ext->ChannelInitEvent); */
 253
 254         /* Notify the NetVsp of the gpadl handle */
 255         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendReceiveBuffer...");
 256
 257         initPacket = &netDevice->ChannelInitPacket;
 258
 259         memset(initPacket, 0, sizeof(struct nvsp_message));
 260
 261         initPacket->Header.MessageType = NvspMessage1TypeSendReceiveBuffer;
 262         initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->ReceiveBufferGpadlHandle;
 263         initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
 264
 265         /* Send the gpadl notification request */
 266         ret = vmbus_sendpacket(Device->channel, initPacket,
 267                                sizeof(struct nvsp_message),
 268                                (unsigned long)initPacket,
 269                                VmbusPacketTypeDataInBand,
 270                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 271         if (ret != 0) {
 272                 DPRINT_ERR(NETVSC,
 273                            "unable to send receive buffer's gpadl to netvsp");
 274                 goto Cleanup;
 275         }
 276
 277         osd_WaitEventWait(netDevice->ChannelInitEvent);
 278
 279         /* Check the response */
 280         if (initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status != NvspStatusSuccess) {
 281                 DPRINT_ERR(NETVSC, "Unable to complete receive buffer "
 282                            "initialzation with NetVsp - status %d",
 283                            initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status);
 284                 ret = -1;
 285                 goto Cleanup;
 286         }
 287
 288         /* Parse the response */
 289         /* ASSERT(netDevice->ReceiveSectionCount == 0); */
 290         /* ASSERT(netDevice->ReceiveSections == NULL); */
 291
 292         netDevice->ReceiveSectionCount = initPacket->Messages.Version1Messages.SendReceiveBufferComplete.NumSections;
 293
 294         netDevice->ReceiveSections = kmalloc(netDevice->ReceiveSectionCount * sizeof(struct nvsp_1_receive_buffer_section), GFP_KERNEL);
 295         if (netDevice->ReceiveSections == NULL) {
 296                 ret = -1;
 297                 goto Cleanup;
 298         }
 299
 300         memcpy(netDevice->ReceiveSections,
 301                 initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Sections,
 302                 netDevice->ReceiveSectionCount * sizeof(struct nvsp_1_receive_buffer_section));
 303
 304         DPRINT_INFO(NETVSC, "Receive sections info (count %d, offset %d, "
 305                     "endoffset %d, suballoc size %d, num suballocs %d)",
 306                     netDevice->ReceiveSectionCount,
 307                     netDevice->ReceiveSections[0].Offset,
 308                     netDevice->ReceiveSections[0].EndOffset,
 309                     netDevice->ReceiveSections[0].SubAllocationSize,
 310                     netDevice->ReceiveSections[0].NumSubAllocations);
 311
 312         /*
 313          * For 1st release, there should only be 1 section that represents the
 314          * entire receive buffer
 315          */
 316         if (netDevice->ReceiveSectionCount != 1 ||
 317             netDevice->ReceiveSections->Offset != 0) {
 318                 ret = -1;
 319                 goto Cleanup;
 320         }
 321
 322         goto Exit;
 323
 324 Cleanup:
 325         NetVscDestroyReceiveBuffer(netDevice);
 326
 327 Exit:
 328         PutNetDevice(Device);
 329         return ret;
 330 }
 331
 332 static int NetVscInitializeSendBufferWithNetVsp(struct hv_device *Device)
 333 {
 334         int ret = 0;
 335         struct netvsc_device *netDevice;
 336         struct nvsp_message *initPacket;
 337
 338         netDevice = GetOutboundNetDevice(Device);
 339         if (!netDevice) {
 340                 DPRINT_ERR(NETVSC, "unable to get net device..."
 341                            "device being destroyed?");
 342                 return -1;
 343         }
 344         if (netDevice->SendBufferSize <= 0) {
 345                 ret = -EINVAL;
 346                 goto Cleanup;
 347         }
 348
 349         /* page-size grandularity */
 350         /* ASSERT((netDevice->SendBufferSize & (PAGE_SIZE - 1)) == 0); */
 351
 352         netDevice->SendBuffer =
 353                 osd_PageAlloc(netDevice->SendBufferSize >> PAGE_SHIFT);
 354         if (!netDevice->SendBuffer) {
 355                 DPRINT_ERR(NETVSC, "unable to allocate send buffer of size %d",
 356                            netDevice->SendBufferSize);
 357                 ret = -1;
 358                 goto Cleanup;
 359         }
 360         /* page-aligned buffer */
 361         /* ASSERT(((unsigned long)netDevice->SendBuffer & (PAGE_SIZE - 1)) == 0); */
 362
 363         DPRINT_INFO(NETVSC, "Establishing send buffer's GPADL...");
 364
 365         /*
 366          * Establish the gpadl handle for this buffer on this
 367          * channel.  Note: This call uses the vmbus connection rather
 368          * than the channel to establish the gpadl handle.
 369          */
 370         ret = vmbus_establish_gpadl(Device->channel, netDevice->SendBuffer,
 371                                     netDevice->SendBufferSize,
 372                                     &netDevice->SendBufferGpadlHandle);
 373         if (ret != 0) {
 374                 DPRINT_ERR(NETVSC, "unable to establish send buffer's gpadl");
 375                 goto Cleanup;
 376         }
 377
 378         /* osd_WaitEventWait(ext->ChannelInitEvent); */
 379
 380         /* Notify the NetVsp of the gpadl handle */
 381         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendSendBuffer...");
 382
 383         initPacket = &netDevice->ChannelInitPacket;
 384
 385         memset(initPacket, 0, sizeof(struct nvsp_message));
 386
 387         initPacket->Header.MessageType = NvspMessage1TypeSendSendBuffer;
 388         initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->SendBufferGpadlHandle;
 389         initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_SEND_BUFFER_ID;
 390
 391         /* Send the gpadl notification request */
 392         ret = vmbus_sendpacket(Device->channel, initPacket,
 393                                sizeof(struct nvsp_message),
 394                                (unsigned long)initPacket,
 395                                VmbusPacketTypeDataInBand,
 396                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 397         if (ret != 0) {
 398                 DPRINT_ERR(NETVSC,
 399                            "unable to send receive buffer's gpadl to netvsp");
 400                 goto Cleanup;
 401         }
 402
 403         osd_WaitEventWait(netDevice->ChannelInitEvent);
 404
 405         /* Check the response */
 406         if (initPacket->Messages.Version1Messages.SendSendBufferComplete.Status != NvspStatusSuccess) {
 407                 DPRINT_ERR(NETVSC, "Unable to complete send buffer "
 408                            "initialzation with NetVsp - status %d",
 409                            initPacket->Messages.Version1Messages.SendSendBufferComplete.Status);
 410                 ret = -1;
 411                 goto Cleanup;
 412         }
 413
 414         netDevice->SendSectionSize = initPacket->Messages.Version1Messages.SendSendBufferComplete.SectionSize;
 415
 416         goto Exit;
 417
 418 Cleanup:
 419         NetVscDestroySendBuffer(netDevice);
 420
 421 Exit:
 422         PutNetDevice(Device);
 423         return ret;
 424 }
 425
 426 static int NetVscDestroyReceiveBuffer(struct netvsc_device *NetDevice)
 427 {
 428         struct nvsp_message *revokePacket;
 429         int ret = 0;
 430
 431         /*
 432          * If we got a section count, it means we received a
 433          * SendReceiveBufferComplete msg (ie sent
 434          * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 435          * to send a revoke msg here
 436          */
 437         if (NetDevice->ReceiveSectionCount) {
 438                 DPRINT_INFO(NETVSC,
 439                             "Sending NvspMessage1TypeRevokeReceiveBuffer...");
 440
 441                 /* Send the revoke receive buffer */
 442                 revokePacket = &NetDevice->RevokePacket;
 443                 memset(revokePacket, 0, sizeof(struct nvsp_message));
 444
 445                 revokePacket->Header.MessageType = NvspMessage1TypeRevokeReceiveBuffer;
 446                 revokePacket->Messages.Version1Messages.RevokeReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
 447
 448                 ret = vmbus_sendpacket(NetDevice->Device->channel, revokePacket,
 449                                        sizeof(struct nvsp_message),
 450                                        (unsigned long)revokePacket,
 451                                        VmbusPacketTypeDataInBand, 0);
 452                 /*
 453                  * If we failed here, we might as well return and
 454                  * have a leak rather than continue and a bugchk
 455                  */
 456                 if (ret != 0) {
 457                         DPRINT_ERR(NETVSC, "unable to send revoke receive "
 458                                    "buffer to netvsp");
 459                         return -1;
 460                 }
 461         }
 462
 463         /* Teardown the gpadl on the vsp end */
 464         if (NetDevice->ReceiveBufferGpadlHandle) {
 465                 DPRINT_INFO(NETVSC, "Tearing down receive buffer's GPADL...");
 466
 467                 ret = vmbus_teardown_gpadl(NetDevice->Device->channel,
 468                                            NetDevice->ReceiveBufferGpadlHandle);
 469
 470                 /* If we failed here, we might as well return and have a leak rather than continue and a bugchk */
 471                 if (ret != 0) {
 472                         DPRINT_ERR(NETVSC,
 473                                    "unable to teardown receive buffer's gpadl");
 474                         return -1;
 475                 }
 476                 NetDevice->ReceiveBufferGpadlHandle = 0;
 477         }
 478
 479         if (NetDevice->ReceiveBuffer) {
 480                 DPRINT_INFO(NETVSC, "Freeing up receive buffer...");
 481
 482                 /* Free up the receive buffer */
 483                 osd_PageFree(NetDevice->ReceiveBuffer,
 484                              NetDevice->ReceiveBufferSize >> PAGE_SHIFT);
 485                 NetDevice->ReceiveBuffer = NULL;
 486         }
 487
 488         if (NetDevice->ReceiveSections) {
 489                 NetDevice->ReceiveSectionCount = 0;
 490                 kfree(NetDevice->ReceiveSections);
 491                 NetDevice->ReceiveSections = NULL;
 492         }
 493
 494         return ret;
 495 }
 496
 497 static int NetVscDestroySendBuffer(struct netvsc_device *NetDevice)
 498 {
 499         struct nvsp_message *revokePacket;
 500         int ret = 0;
 501
 502         /*
 503          * If we got a section count, it means we received a
 504          *  SendReceiveBufferComplete msg (ie sent
 505          *  NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 506          *  to send a revoke msg here
 507          */
 508         if (NetDevice->SendSectionSize) {
 509                 DPRINT_INFO(NETVSC,
 510                             "Sending NvspMessage1TypeRevokeSendBuffer...");
 511
 512                 /* Send the revoke send buffer */
 513                 revokePacket = &NetDevice->RevokePacket;
 514                 memset(revokePacket, 0, sizeof(struct nvsp_message));
 515
 516                 revokePacket->Header.MessageType = NvspMessage1TypeRevokeSendBuffer;
 517                 revokePacket->Messages.Version1Messages.RevokeSendBuffer.Id = NETVSC_SEND_BUFFER_ID;
 518
 519                 ret = vmbus_sendpacket(NetDevice->Device->channel, revokePacket,
 520                                        sizeof(struct nvsp_message),
 521                                        (unsigned long)revokePacket,
 522                                        VmbusPacketTypeDataInBand, 0);
 523                 /*
 524                  * If we failed here, we might as well return and have a leak
 525                  * rather than continue and a bugchk
 526                  */
 527                 if (ret != 0) {
 528                         DPRINT_ERR(NETVSC, "unable to send revoke send buffer "
 529                                    "to netvsp");
 530                         return -1;
 531                 }
 532         }
 533
 534         /* Teardown the gpadl on the vsp end */
 535         if (NetDevice->SendBufferGpadlHandle) {
 536                 DPRINT_INFO(NETVSC, "Tearing down send buffer's GPADL...");
 537                 ret = vmbus_teardown_gpadl(NetDevice->Device->channel,
 538                                            NetDevice->SendBufferGpadlHandle);
 539
 540                 /*
 541                  * If we failed here, we might as well return and have a leak
 542                  * rather than continue and a bugchk
 543                  */
 544                 if (ret != 0) {
 545                         DPRINT_ERR(NETVSC, "unable to teardown send buffer's "
 546                                    "gpadl");
 547                         return -1;
 548                 }
 549                 NetDevice->SendBufferGpadlHandle = 0;
 550         }
 551
 552         if (NetDevice->SendBuffer) {
 553                 DPRINT_INFO(NETVSC, "Freeing up send buffer...");
 554
 555                 /* Free up the receive buffer */
 556                 osd_PageFree(NetDevice->SendBuffer,
 557                              NetDevice->SendBufferSize >> PAGE_SHIFT);
 558                 NetDevice->SendBuffer = NULL;
 559         }
 560
 561         return ret;
 562 }
 563
 564
 565 static int NetVscConnectToVsp(struct hv_device *Device)
 566 {
 567         int ret;
 568         struct netvsc_device *netDevice;
 569         struct nvsp_message *initPacket;
 570         int ndisVersion;
 571
 572         netDevice = GetOutboundNetDevice(Device);
 573         if (!netDevice) {
 574                 DPRINT_ERR(NETVSC, "unable to get net device..."
 575                            "device being destroyed?");
 576                 return -1;
 577         }
 578
 579         initPacket = &netDevice->ChannelInitPacket;
 580
 581         memset(initPacket, 0, sizeof(struct nvsp_message));
 582         initPacket->Header.MessageType = NvspMessageTypeInit;
 583         initPacket->Messages.InitMessages.Init.MinProtocolVersion = NVSP_MIN_PROTOCOL_VERSION;
 584         initPacket->Messages.InitMessages.Init.MaxProtocolVersion = NVSP_MAX_PROTOCOL_VERSION;
 585
 586         DPRINT_INFO(NETVSC, "Sending NvspMessageTypeInit...");
 587
 588         /* Send the init request */
 589         ret = vmbus_sendpacket(Device->channel, initPacket,
 590                                sizeof(struct nvsp_message),
 591                                (unsigned long)initPacket,
 592                                VmbusPacketTypeDataInBand,
 593                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 594
 595         if (ret != 0) {
 596                 DPRINT_ERR(NETVSC, "unable to send NvspMessageTypeInit");
 597                 goto Cleanup;
 598         }
 599
 600         osd_WaitEventWait(netDevice->ChannelInitEvent);
 601
 602         /* Now, check the response */
 603         /* ASSERT(initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength <= MAX_MULTIPAGE_BUFFER_COUNT); */
 604         DPRINT_INFO(NETVSC, "NvspMessageTypeInit status(%d) max mdl chain (%d)",
 605                 initPacket->Messages.InitMessages.InitComplete.Status,
 606                 initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength);
 607
 608         if (initPacket->Messages.InitMessages.InitComplete.Status !=
 609             NvspStatusSuccess) {
 610                 DPRINT_ERR(NETVSC,
 611                         "unable to initialize with netvsp (status 0x%x)",
 612                         initPacket->Messages.InitMessages.InitComplete.Status);
 613                 ret = -1;
 614                 goto Cleanup;
 615         }
 616
 617         if (initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion != NVSP_PROTOCOL_VERSION_1) {
 618                 DPRINT_ERR(NETVSC, "unable to initialize with netvsp "
 619                            "(version expected 1 got %d)",
 620                            initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion);
 621                 ret = -1;
 622                 goto Cleanup;
 623         }
 624         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendNdisVersion...");
 625
 626         /* Send the ndis version */
 627         memset(initPacket, 0, sizeof(struct nvsp_message));
 628
 629         ndisVersion = 0x00050000;
 630
 631         initPacket->Header.MessageType = NvspMessage1TypeSendNdisVersion;
 632         initPacket->Messages.Version1Messages.SendNdisVersion.NdisMajorVersion =
 633                                 (ndisVersion & 0xFFFF0000) >> 16;
 634         initPacket->Messages.Version1Messages.SendNdisVersion.NdisMinorVersion =
 635                                 ndisVersion & 0xFFFF;
 636
 637         /* Send the init request */
 638         ret = vmbus_sendpacket(Device->channel, initPacket,
 639                                sizeof(struct nvsp_message),
 640                                (unsigned long)initPacket,
 641                                VmbusPacketTypeDataInBand, 0);
 642         if (ret != 0) {
 643                 DPRINT_ERR(NETVSC,
 644                            "unable to send NvspMessage1TypeSendNdisVersion");
 645                 ret = -1;
 646                 goto Cleanup;
 647         }
 648         /*
 649          * BUGBUG - We have to wait for the above msg since the
 650          * netvsp uses KMCL which acknowledges packet (completion
 651          * packet) since our Vmbus always set the
 652          * VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED flag
 653          */
 654          /* osd_WaitEventWait(NetVscChannel->ChannelInitEvent); */
 655
 656         /* Post the big receive buffer to NetVSP */
 657         ret = NetVscInitializeReceiveBufferWithNetVsp(Device);
 658         if (ret == 0)
 659                 ret = NetVscInitializeSendBufferWithNetVsp(Device);
 660
 661 Cleanup:
 662         PutNetDevice(Device);
 663         return ret;
 664 }
 665
 666 static void NetVscDisconnectFromVsp(struct netvsc_device *NetDevice)
 667 {
 668         NetVscDestroyReceiveBuffer(NetDevice);
 669         NetVscDestroySendBuffer(NetDevice);
 670 }
 671
 672 /*
 673  * NetVscOnDeviceAdd - Callback when the device belonging to this driver is added
 674  */
 675 static int NetVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo)
 676 {
 677         int ret = 0;
 678         int i;
 679         struct netvsc_device *netDevice;
 680         struct hv_netvsc_packet *packet, *pos;
 681         struct netvsc_driver *netDriver =
 682                                 (struct netvsc_driver *)Device->Driver;
 683
 684         netDevice = AllocNetDevice(Device);
 685         if (!netDevice) {
 686                 ret = -1;
 687                 goto Cleanup;
 688         }
 689
 690         DPRINT_DBG(NETVSC, "netvsc channel object allocated - %p", netDevice);
 691
 692         /* Initialize the NetVSC channel extension */
 693         netDevice->ReceiveBufferSize = NETVSC_RECEIVE_BUFFER_SIZE;
 694         spin_lock_init(&netDevice->receive_packet_list_lock);
 695
 696         netDevice->SendBufferSize = NETVSC_SEND_BUFFER_SIZE;
 697
 698         INIT_LIST_HEAD(&netDevice->ReceivePacketList);
 699
 700         for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
 701                 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
 702                                  (NETVSC_RECEIVE_SG_COUNT *
 703                                   sizeof(struct hv_page_buffer)), GFP_KERNEL);
 704                 if (!packet) {
 705                         DPRINT_DBG(NETVSC, "unable to allocate netvsc pkts "
 706                                    "for receive pool (wanted %d got %d)",
 707                                    NETVSC_RECEIVE_PACKETLIST_COUNT, i);
 708                         break;
 709                 }
 710                 list_add_tail(&packet->ListEntry,
 711                               &netDevice->ReceivePacketList);
 712         }
 713         netDevice->ChannelInitEvent = osd_WaitEventCreate();
 714         if (!netDevice->ChannelInitEvent) {
 715                 ret = -ENOMEM;
 716                 goto Cleanup;
 717         }
 718
 719         /* Open the channel */
 720         ret = Device->Driver->VmbusChannelInterface.Open(Device,
 721                                                 netDriver->RingBufferSize,
 722                                                 netDriver->RingBufferSize,
 723                                                 NULL, 0,
 724                                                 NetVscOnChannelCallback,
 725                                                 Device);
 726
 727         if (ret != 0) {
 728                 DPRINT_ERR(NETVSC, "unable to open channel: %d", ret);
 729                 ret = -1;
 730                 goto Cleanup;
 731         }
 732
 733         /* Channel is opened */
 734         DPRINT_INFO(NETVSC, "*** NetVSC channel opened successfully! ***");
 735
 736         /* Connect with the NetVsp */
 737         ret = NetVscConnectToVsp(Device);
 738         if (ret != 0) {
 739                 DPRINT_ERR(NETVSC, "unable to connect to NetVSP - %d", ret);
 740                 ret = -1;
 741                 goto close;
 742         }
 743
 744         DPRINT_INFO(NETVSC, "*** NetVSC channel handshake result - %d ***",
 745                     ret);
 746
 747         return ret;
 748
 749 close:
 750         /* Now, we can close the channel safely */
 751         vmbus_close(Device->channel);
 752
 753 Cleanup:
 754
 755         if (netDevice) {
 756                 kfree(netDevice->ChannelInitEvent);
 757
 758                 list_for_each_entry_safe(packet, pos,
 759                                          &netDevice->ReceivePacketList,
 760                                          ListEntry) {
 761                         list_del(&packet->ListEntry);
 762                         kfree(packet);
 763                 }
 764
 765                 ReleaseOutboundNetDevice(Device);
 766                 ReleaseInboundNetDevice(Device);
 767
 768                 FreeNetDevice(netDevice);
 769         }
 770
 771         return ret;
 772 }
 773
 774 /*
 775  * NetVscOnDeviceRemove - Callback when the root bus device is removed
 776  */
 777 static int NetVscOnDeviceRemove(struct hv_device *Device)
 778 {
 779         struct netvsc_device *netDevice;
 780         struct hv_netvsc_packet *netvscPacket, *pos;
 781
 782         DPRINT_INFO(NETVSC, "Disabling outbound traffic on net device (%p)...",
 783                     Device->Extension);
 784
 785         /* Stop outbound traffic ie sends and receives completions */
 786         netDevice = ReleaseOutboundNetDevice(Device);
 787         if (!netDevice) {
 788                 DPRINT_ERR(NETVSC, "No net device present!!");
 789                 return -1;
 790         }
 791
 792         /* Wait for all send completions */
 793         while (atomic_read(&netDevice->NumOutstandingSends)) {
 794                 DPRINT_INFO(NETVSC, "waiting for %d requests to complete...",
 795                             atomic_read(&netDevice->NumOutstandingSends));
 796                 udelay(100);
 797         }
 798
 799         DPRINT_INFO(NETVSC, "Disconnecting from netvsp...");
 800
 801         NetVscDisconnectFromVsp(netDevice);
 802
 803         DPRINT_INFO(NETVSC, "Disabling inbound traffic on net device (%p)...",
 804                     Device->Extension);
 805
 806         /* Stop inbound traffic ie receives and sends completions */
 807         netDevice = ReleaseInboundNetDevice(Device);
 808
 809         /* At this point, no one should be accessing netDevice except in here */
 810         DPRINT_INFO(NETVSC, "net device (%p) safe to remove", netDevice);
 811
 812         /* Now, we can close the channel safely */
 813         vmbus_close(Device->channel);
 814
 815         /* Release all resources */
 816         list_for_each_entry_safe(netvscPacket, pos,
 817                                  &netDevice->ReceivePacketList, ListEntry) {
 818                 list_del(&netvscPacket->ListEntry);
 819                 kfree(netvscPacket);
 820         }
 821
 822         kfree(netDevice->ChannelInitEvent);
 823         FreeNetDevice(netDevice);
 824         return 0;
 825 }
 826
 827 /*
 828  * NetVscOnCleanup - Perform any cleanup when the driver is removed
 829  */
 830 static void NetVscOnCleanup(struct hv_driver *drv)
 831 {
 832 }
 833
 834 static void NetVscOnSendCompletion(struct hv_device *Device,
 835                                    struct vmpacket_descriptor *Packet)
 836 {
 837         struct netvsc_device *netDevice;
 838         struct nvsp_message *nvspPacket;
 839         struct hv_netvsc_packet *nvscPacket;
 840
 841         netDevice = GetInboundNetDevice(Device);
 842         if (!netDevice) {
 843                 DPRINT_ERR(NETVSC, "unable to get net device..."
 844                            "device being destroyed?");
 845                 return;
 846         }
 847
 848         nvspPacket = (struct nvsp_message *)((unsigned long)Packet + (Packet->DataOffset8 << 3));
 849
 850         DPRINT_DBG(NETVSC, "send completion packet - type %d",
 851                    nvspPacket->Header.MessageType);
 852
 853         if ((nvspPacket->Header.MessageType == NvspMessageTypeInitComplete) ||
 854             (nvspPacket->Header.MessageType ==
 855              NvspMessage1TypeSendReceiveBufferComplete) ||
 856             (nvspPacket->Header.MessageType ==
 857              NvspMessage1TypeSendSendBufferComplete)) {
 858                 /* Copy the response back */
 859                 memcpy(&netDevice->ChannelInitPacket, nvspPacket,
 860                        sizeof(struct nvsp_message));
 861                 osd_WaitEventSet(netDevice->ChannelInitEvent);
 862         } else if (nvspPacket->Header.MessageType ==
 863                    NvspMessage1TypeSendRNDISPacketComplete) {
 864                 /* Get the send context */
 865                 nvscPacket = (struct hv_netvsc_packet *)(unsigned long)Packet->TransactionId;
 866                 /* ASSERT(nvscPacket); */
 867
 868                 /* Notify the layer above us */
 869                 nvscPacket->Completion.Send.OnSendCompletion(nvscPacket->Completion.Send.SendCompletionContext);
 870
 871                 atomic_dec(&netDevice->NumOutstandingSends);
 872         } else {
 873                 DPRINT_ERR(NETVSC, "Unknown send completion packet type - "
 874                            "%d received!!", nvspPacket->Header.MessageType);
 875         }
 876
 877         PutNetDevice(Device);
 878 }
 879
 880 static int NetVscOnSend(struct hv_device *Device,
 881                         struct hv_netvsc_packet *Packet)
 882 {
 883         struct netvsc_device *netDevice;
 884         int ret = 0;
 885
 886         struct nvsp_message sendMessage;
 887
 888         netDevice = GetOutboundNetDevice(Device);
 889         if (!netDevice) {
 890                 DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
 891                            "ignoring outbound packets", netDevice);
 892                 return -2;
 893         }
 894
 895         sendMessage.Header.MessageType = NvspMessage1TypeSendRNDISPacket;
 896         if (Packet->IsDataPacket) {
 897                 /* 0 is RMC_DATA; */
 898                 sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 0;
 899         } else {
 900                 /* 1 is RMC_CONTROL; */
 901                 sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 1;
 902         }
 903
 904         /* Not using send buffer section */
 905         sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionIndex = 0xFFFFFFFF;
 906         sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionSize = 0;
 907
 908         if (Packet->PageBufferCount) {
 909                 ret = vmbus_sendpacket_pagebuffer(Device->channel,
 910                                                   Packet->PageBuffers,
 911                                                   Packet->PageBufferCount,
 912                                                   &sendMessage,
 913                                                   sizeof(struct nvsp_message),
 914                                                   (unsigned long)Packet);
 915         } else {
 916                 ret = vmbus_sendpacket(Device->channel, &sendMessage,
 917                                        sizeof(struct nvsp_message),
 918                                        (unsigned long)Packet,
 919                                        VmbusPacketTypeDataInBand,
 920                                        VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 921
 922         }
 923
 924         if (ret != 0)
 925                 DPRINT_ERR(NETVSC, "Unable to send packet %p ret %d",
 926                            Packet, ret);
 927
 928         atomic_inc(&netDevice->NumOutstandingSends);
 929         PutNetDevice(Device);
 930         return ret;
 931 }
 932
 933 static void NetVscOnReceive(struct hv_device *Device,
 934                             struct vmpacket_descriptor *Packet)
 935 {
 936         struct netvsc_device *netDevice;
 937         struct vmtransfer_page_packet_header *vmxferpagePacket;
 938         struct nvsp_message *nvspPacket;
 939         struct hv_netvsc_packet *netvscPacket = NULL;
 940         unsigned long start;
 941         unsigned long end, endVirtual;
 942         /* struct netvsc_driver *netvscDriver; */
 943         struct xferpage_packet *xferpagePacket = NULL;
 944         int i, j;
 945         int count = 0, bytesRemain = 0;
 946         unsigned long flags;
 947         LIST_HEAD(listHead);
 948
 949         netDevice = GetInboundNetDevice(Device);
 950         if (!netDevice) {
 951                 DPRINT_ERR(NETVSC, "unable to get net device..."
 952                            "device being destroyed?");
 953                 return;
 954         }
 955
 956         /*
 957          * All inbound packets other than send completion should be xfer page
 958          * packet
 959          */
 960         if (Packet->Type != VmbusPacketTypeDataUsingTransferPages) {
 961                 DPRINT_ERR(NETVSC, "Unknown packet type received - %d",
 962                            Packet->Type);
 963                 PutNetDevice(Device);
 964                 return;
 965         }
 966
 967         nvspPacket = (struct nvsp_message *)((unsigned long)Packet +
 968                         (Packet->DataOffset8 << 3));
 969
 970         /* Make sure this is a valid nvsp packet */
 971         if (nvspPacket->Header.MessageType != NvspMessage1TypeSendRNDISPacket) {
 972                 DPRINT_ERR(NETVSC, "Unknown nvsp packet type received - %d",
 973                            nvspPacket->Header.MessageType);
 974                 PutNetDevice(Device);
 975                 return;
 976         }
 977
 978         DPRINT_DBG(NETVSC, "NVSP packet received - type %d",
 979                    nvspPacket->Header.MessageType);
 980
 981         vmxferpagePacket = (struct vmtransfer_page_packet_header *)Packet;
 982
 983         if (vmxferpagePacket->TransferPageSetId != NETVSC_RECEIVE_BUFFER_ID) {
 984                 DPRINT_ERR(NETVSC, "Invalid xfer page set id - "
 985                            "expecting %x got %x", NETVSC_RECEIVE_BUFFER_ID,
 986                            vmxferpagePacket->TransferPageSetId);
 987                 PutNetDevice(Device);
 988                 return;
 989         }
 990
 991         DPRINT_DBG(NETVSC, "xfer page - range count %d",
 992                    vmxferpagePacket->RangeCount);
 993
 994         /*
 995          * Grab free packets (range count + 1) to represent this xfer
 996          * page packet. +1 to represent the xfer page packet itself.
 997          * We grab it here so that we know exactly how many we can
 998          * fulfil
 999          */
1000         spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1001         while (!list_empty(&netDevice->ReceivePacketList)) {
1002                 list_move_tail(netDevice->ReceivePacketList.next, &listHead);
1003                 if (++count == vmxferpagePacket->RangeCount + 1)
1004                         break;
1005         }
1006         spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
1007
1008         /*
1009          * We need at least 2 netvsc pkts (1 to represent the xfer
1010          * page and at least 1 for the range) i.e. we can handled
1011          * some of the xfer page packet ranges...
1012          */
1013         if (count < 2) {
1014                 DPRINT_ERR(NETVSC, "Got only %d netvsc pkt...needed %d pkts. "
1015                            "Dropping this xfer page packet completely!",
1016                            count, vmxferpagePacket->RangeCount + 1);
1017
1018                 /* Return it to the freelist */
1019                 spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1020                 for (i = count; i != 0; i--) {
1021                         list_move_tail(listHead.next,
1022                                        &netDevice->ReceivePacketList);
1023                 }
1024                 spin_unlock_irqrestore(&netDevice->receive_packet_list_lock,
1025                                        flags);
1026
1027                 NetVscSendReceiveCompletion(Device,
1028                                             vmxferpagePacket->d.TransactionId);
1029
1030                 PutNetDevice(Device);
1031                 return;
1032         }
1033
1034         /* Remove the 1st packet to represent the xfer page packet itself */
1035         xferpagePacket = (struct xferpage_packet *)listHead.next;
1036         list_del(&xferpagePacket->ListEntry);
1037
1038         /* This is how much we can satisfy */
1039         xferpagePacket->Count = count - 1;
1040         /* ASSERT(xferpagePacket->Count > 0 && xferpagePacket->Count <= */
1041         /*      vmxferpagePacket->RangeCount); */
1042
1043         if (xferpagePacket->Count != vmxferpagePacket->RangeCount) {
1044                 DPRINT_INFO(NETVSC, "Needed %d netvsc pkts to satisy this xfer "
1045                             "page...got %d", vmxferpagePacket->RangeCount,
1046                             xferpagePacket->Count);
1047         }
1048
1049         /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1050         for (i = 0; i < (count - 1); i++) {
1051                 netvscPacket = (struct hv_netvsc_packet *)listHead.next;
1052                 list_del(&netvscPacket->ListEntry);
1053
1054                 /* Initialize the netvsc packet */
1055                 netvscPacket->XferPagePacket = xferpagePacket;
1056                 netvscPacket->Completion.Recv.OnReceiveCompletion =
1057                                         NetVscOnReceiveCompletion;
1058                 netvscPacket->Completion.Recv.ReceiveCompletionContext =
1059                                         netvscPacket;
1060                 netvscPacket->Device = Device;
1061                 /* Save this so that we can send it back */
1062                 netvscPacket->Completion.Recv.ReceiveCompletionTid =
1063                                         vmxferpagePacket->d.TransactionId;
1064
1065                 netvscPacket->TotalDataBufferLength =
1066                                         vmxferpagePacket->Ranges[i].ByteCount;
1067                 netvscPacket->PageBufferCount = 1;
1068
1069                 /* ASSERT(vmxferpagePacket->Ranges[i].ByteOffset + */
1070                 /*      vmxferpagePacket->Ranges[i].ByteCount < */
1071                 /*      netDevice->ReceiveBufferSize); */
1072
1073                 netvscPacket->PageBuffers[0].Length =
1074                                         vmxferpagePacket->Ranges[i].ByteCount;
1075
1076                 start = virt_to_phys((void *)((unsigned long)netDevice->ReceiveBuffer + vmxferpagePacket->Ranges[i].ByteOffset));
1077
1078                 netvscPacket->PageBuffers[0].Pfn = start >> PAGE_SHIFT;
1079                 endVirtual = (unsigned long)netDevice->ReceiveBuffer
1080                     + vmxferpagePacket->Ranges[i].ByteOffset
1081                     + vmxferpagePacket->Ranges[i].ByteCount - 1;
1082                 end = virt_to_phys((void *)endVirtual);
1083
1084                 /* Calculate the page relative offset */
1085                 netvscPacket->PageBuffers[0].Offset =
1086                         vmxferpagePacket->Ranges[i].ByteOffset & (PAGE_SIZE - 1);
1087                 if ((end >> PAGE_SHIFT) != (start >> PAGE_SHIFT)) {
1088                         /* Handle frame across multiple pages: */
1089                         netvscPacket->PageBuffers[0].Length =
1090                                 (netvscPacket->PageBuffers[0].Pfn << PAGE_SHIFT)
1091                                 + PAGE_SIZE - start;
1092                         bytesRemain = netvscPacket->TotalDataBufferLength -
1093                                         netvscPacket->PageBuffers[0].Length;
1094                         for (j = 1; j < NETVSC_PACKET_MAXPAGE; j++) {
1095                                 netvscPacket->PageBuffers[j].Offset = 0;
1096                                 if (bytesRemain <= PAGE_SIZE) {
1097                                         netvscPacket->PageBuffers[j].Length = bytesRemain;
1098                                         bytesRemain = 0;
1099                                 } else {
1100                                         netvscPacket->PageBuffers[j].Length = PAGE_SIZE;
1101                                         bytesRemain -= PAGE_SIZE;
1102                                 }
1103                                 netvscPacket->PageBuffers[j].Pfn =
1104                                     virt_to_phys((void *)(endVirtual - bytesRemain)) >> PAGE_SHIFT;
1105                                 netvscPacket->PageBufferCount++;
1106                                 if (bytesRemain == 0)
1107                                         break;
1108                         }
1109                         /* ASSERT(bytesRemain == 0); */
1110                 }
1111                 DPRINT_DBG(NETVSC, "[%d] - (abs offset %u len %u) => "
1112                            "(pfn %llx, offset %u, len %u)", i,
1113                            vmxferpagePacket->Ranges[i].ByteOffset,
1114                            vmxferpagePacket->Ranges[i].ByteCount,
1115                            netvscPacket->PageBuffers[0].Pfn,
1116                            netvscPacket->PageBuffers[0].Offset,
1117                            netvscPacket->PageBuffers[0].Length);
1118
1119                 /* Pass it to the upper layer */
1120                 ((struct netvsc_driver *)Device->Driver)->OnReceiveCallback(Device, netvscPacket);
1121
1122                 NetVscOnReceiveCompletion(netvscPacket->Completion.Recv.ReceiveCompletionContext);
1123         }
1124
1125         /* ASSERT(list_empty(&listHead)); */
1126
1127         PutNetDevice(Device);
1128 }
1129
1130 static void NetVscSendReceiveCompletion(struct hv_device *Device,
1131                                         u64 TransactionId)
1132 {
1133         struct nvsp_message recvcompMessage;
1134         int retries = 0;
1135         int ret;
1136
1137         DPRINT_DBG(NETVSC, "Sending receive completion pkt - %llx",
1138                    TransactionId);
1139
1140         recvcompMessage.Header.MessageType =
1141                                 NvspMessage1TypeSendRNDISPacketComplete;
1142
1143         /* FIXME: Pass in the status */
1144         recvcompMessage.Messages.Version1Messages.SendRNDISPacketComplete.Status = NvspStatusSuccess;
1145
1146 retry_send_cmplt:
1147         /* Send the completion */
1148         ret = vmbus_sendpacket(Device->channel, &recvcompMessage,
1149                                sizeof(struct nvsp_message), TransactionId,
1150                                VmbusPacketTypeCompletion, 0);
1151         if (ret == 0) {
1152                 /* success */
1153                 /* no-op */
1154         } else if (ret == -1) {
1155                 /* no more room...wait a bit and attempt to retry 3 times */
1156                 retries++;
1157                 DPRINT_ERR(NETVSC, "unable to send receive completion pkt "
1158                            "(tid %llx)...retrying %d", TransactionId, retries);
1159
1160                 if (retries < 4) {
1161                         udelay(100);
1162                         goto retry_send_cmplt;
1163                 } else {
1164                         DPRINT_ERR(NETVSC, "unable to send receive completion "
1165                                   "pkt (tid %llx)...give up retrying",
1166                                   TransactionId);
1167                 }
1168         } else {
1169                 DPRINT_ERR(NETVSC, "unable to send receive completion pkt - "
1170                            "%llx", TransactionId);
1171         }
1172 }
1173
1174 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
1175 static void NetVscOnReceiveCompletion(void *Context)
1176 {
1177         struct hv_netvsc_packet *packet = Context;
1178         struct hv_device *device = (struct hv_device *)packet->Device;
1179         struct netvsc_device *netDevice;
1180         u64 transactionId = 0;
1181         bool fSendReceiveComp = false;
1182         unsigned long flags;
1183
1184         /* ASSERT(packet->XferPagePacket); */
1185
1186         /*
1187          * Even though it seems logical to do a GetOutboundNetDevice() here to
1188          * send out receive completion, we are using GetInboundNetDevice()
1189          * since we may have disable outbound traffic already.
1190          */
1191         netDevice = GetInboundNetDevice(device);
1192         if (!netDevice) {
1193                 DPRINT_ERR(NETVSC, "unable to get net device..."
1194                            "device being destroyed?");
1195                 return;
1196         }
1197
1198         /* Overloading use of the lock. */
1199         spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1200
1201         /* ASSERT(packet->XferPagePacket->Count > 0); */
1202         packet->XferPagePacket->Count--;
1203
1204         /*
1205          * Last one in the line that represent 1 xfer page packet.
1206          * Return the xfer page packet itself to the freelist
1207          */
1208         if (packet->XferPagePacket->Count == 0) {
1209                 fSendReceiveComp = true;
1210                 transactionId = packet->Completion.Recv.ReceiveCompletionTid;
1211                 list_add_tail(&packet->XferPagePacket->ListEntry,
1212                               &netDevice->ReceivePacketList);
1213
1214         }
1215
1216         /* Put the packet back */
1217         list_add_tail(&packet->ListEntry, &netDevice->ReceivePacketList);
1218         spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
1219
1220         /* Send a receive completion for the xfer page packet */
1221         if (fSendReceiveComp)
1222                 NetVscSendReceiveCompletion(device, transactionId);
1223
1224         PutNetDevice(device);
1225 }
1226
1227 static void NetVscOnChannelCallback(void *Context)
1228 {
1229         int ret;
1230         struct hv_device *device = Context;
1231         struct netvsc_device *netDevice;
1232         u32 bytesRecvd;
1233         u64 requestId;
1234         unsigned char *packet;
1235         struct vmpacket_descriptor *desc;
1236         unsigned char *buffer;
1237         int bufferlen = NETVSC_PACKET_SIZE;
1238
1239         /* ASSERT(device); */
1240
1241         packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
1242                          GFP_KERNEL);
1243         if (!packet)
1244                 return;
1245         buffer = packet;
1246
1247         netDevice = GetInboundNetDevice(device);
1248         if (!netDevice) {
1249                 DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
1250                            "ignoring inbound packets", netDevice);
1251                 goto out;
1252         }
1253
1254         do {
1255                 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
1256                                            &bytesRecvd, &requestId);
1257                 if (ret == 0) {
1258                         if (bytesRecvd > 0) {
1259                                 DPRINT_DBG(NETVSC, "receive %d bytes, tid %llx",
1260                                            bytesRecvd, requestId);
1261
1262                                 desc = (struct vmpacket_descriptor *)buffer;
1263                                 switch (desc->Type) {
1264                                 case VmbusPacketTypeCompletion:
1265                                         NetVscOnSendCompletion(device, desc);
1266                                         break;
1267
1268                                 case VmbusPacketTypeDataUsingTransferPages:
1269                                         NetVscOnReceive(device, desc);
1270                                         break;
1271
1272                                 default:
1273                                         DPRINT_ERR(NETVSC,
1274                                                    "unhandled packet type %d, "
1275                                                    "tid %llx len %d\n",
1276                                                    desc->Type, requestId,
1277                                                    bytesRecvd);
1278                                         break;
1279                                 }
1280
1281                                 /* reset */
1282                                 if (bufferlen > NETVSC_PACKET_SIZE) {
1283                                         kfree(buffer);
1284                                         buffer = packet;
1285                                         bufferlen = NETVSC_PACKET_SIZE;
1286                                 }
1287                         } else {
1288                                 /* reset */
1289                                 if (bufferlen > NETVSC_PACKET_SIZE) {
1290                                         kfree(buffer);
1291                                         buffer = packet;
1292                                         bufferlen = NETVSC_PACKET_SIZE;
1293                                 }
1294
1295                                 break;
1296                         }
1297                 } else if (ret == -2) {
1298                         /* Handle large packet */
1299                         buffer = kmalloc(bytesRecvd, GFP_ATOMIC);
1300                         if (buffer == NULL) {
1301                                 /* Try again next time around */
1302                                 DPRINT_ERR(NETVSC,
1303                                            "unable to allocate buffer of size "
1304                                            "(%d)!!", bytesRecvd);
1305                                 break;
1306                         }
1307
1308                         bufferlen = bytesRecvd;
1309                 }
1310         } while (1);
1311
1312         PutNetDevice(device);
1313 out:
1314         kfree(buffer);
1315         return;
1316 }