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
  31
  32 /* Globals */
  33 static const char *gDriverName = "netvsc";
  34
  35 /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  36 static const struct hv_guid gNetVscDeviceType = {
  37         .data = {
  38                 0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  39                 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  40         }
  41 };
  42
  43 static int NetVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo);
  44
  45 static int NetVscOnDeviceRemove(struct hv_device *Device);
  46
  47 static void NetVscOnCleanup(struct hv_driver *Driver);
  48
  49 static void NetVscOnChannelCallback(void *context);
  50
  51 static int NetVscInitializeSendBufferWithNetVsp(struct hv_device *Device);
  52
  53 static int NetVscInitializeReceiveBufferWithNetVsp(struct hv_device *Device);
  54
  55 static int NetVscDestroySendBuffer(struct netvsc_device *NetDevice);
  56
  57 static int NetVscDestroyReceiveBuffer(struct netvsc_device *NetDevice);
  58
  59 static int NetVscConnectToVsp(struct hv_device *Device);
  60
  61 static void NetVscOnSendCompletion(struct hv_device *Device,
  62                                    struct vmpacket_descriptor *Packet);
  63
  64 static int NetVscOnSend(struct hv_device *Device,
  65                         struct hv_netvsc_packet *Packet);
  66
  67 static void NetVscOnReceive(struct hv_device *Device,
  68                             struct vmpacket_descriptor *Packet);
  69
  70 static void NetVscOnReceiveCompletion(void *Context);
  71
  72 static void NetVscSendReceiveCompletion(struct hv_device *Device,
  73                                         u64 TransactionId);
  74
  75
  76 static struct netvsc_device *AllocNetDevice(struct hv_device *Device)
  77 {
  78         struct netvsc_device *netDevice;
  79
  80         netDevice = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
  81         if (!netDevice)
  82                 return NULL;
  83
  84         /* Set to 2 to allow both inbound and outbound traffic */
  85         atomic_cmpxchg(&netDevice->RefCount, 0, 2);
  86
  87         netDevice->Device = Device;
  88         Device->Extension = netDevice;
  89
  90         return netDevice;
  91 }
  92
  93 static void FreeNetDevice(struct netvsc_device *Device)
  94 {
  95         WARN_ON(atomic_read(&Device->RefCount) == 0);
  96         Device->Device->Extension = NULL;
  97         kfree(Device);
  98 }
  99
 100
 101 /* Get the net device object iff exists and its refcount > 1 */
 102 static struct netvsc_device *GetOutboundNetDevice(struct hv_device *Device)
 103 {
 104         struct netvsc_device *netDevice;
 105
 106         netDevice = Device->Extension;
 107         if (netDevice && atomic_read(&netDevice->RefCount) > 1)
 108                 atomic_inc(&netDevice->RefCount);
 109         else
 110                 netDevice = NULL;
 111
 112         return netDevice;
 113 }
 114
 115 /* Get the net device object iff exists and its refcount > 0 */
 116 static struct netvsc_device *GetInboundNetDevice(struct hv_device *Device)
 117 {
 118         struct netvsc_device *netDevice;
 119
 120         netDevice = Device->Extension;
 121         if (netDevice && atomic_read(&netDevice->RefCount))
 122                 atomic_inc(&netDevice->RefCount);
 123         else
 124                 netDevice = NULL;
 125
 126         return netDevice;
 127 }
 128
 129 static void PutNetDevice(struct hv_device *Device)
 130 {
 131         struct netvsc_device *netDevice;
 132
 133         netDevice = Device->Extension;
 134         /* ASSERT(netDevice); */
 135
 136         atomic_dec(&netDevice->RefCount);
 137 }
 138
 139 static struct netvsc_device *ReleaseOutboundNetDevice(struct hv_device *Device)
 140 {
 141         struct netvsc_device *netDevice;
 142
 143         netDevice = Device->Extension;
 144         if (netDevice == NULL)
 145                 return NULL;
 146
 147         /* Busy wait until the ref drop to 2, then set it to 1 */
 148         while (atomic_cmpxchg(&netDevice->RefCount, 2, 1) != 2)
 149                 udelay(100);
 150
 151         return netDevice;
 152 }
 153
 154 static struct netvsc_device *ReleaseInboundNetDevice(struct hv_device *Device)
 155 {
 156         struct netvsc_device *netDevice;
 157
 158         netDevice = Device->Extension;
 159         if (netDevice == NULL)
 160                 return NULL;
 161
 162         /* Busy wait until the ref drop to 1, then set it to 0 */
 163         while (atomic_cmpxchg(&netDevice->RefCount, 1, 0) != 1)
 164                 udelay(100);
 165
 166         Device->Extension = NULL;
 167         return netDevice;
 168 }
 169
 170 /*
 171  * NetVscInitialize - Main entry point
 172  */
 173 int NetVscInitialize(struct hv_driver *drv)
 174 {
 175         struct netvsc_driver *driver = (struct netvsc_driver *)drv;
 176
 177         DPRINT_DBG(NETVSC, "sizeof(struct hv_netvsc_packet)=%zd, "
 178                    "sizeof(struct nvsp_message)=%zd, "
 179                    "sizeof(struct vmtransfer_page_packet_header)=%zd",
 180                    sizeof(struct hv_netvsc_packet),
 181                    sizeof(struct nvsp_message),
 182                    sizeof(struct vmtransfer_page_packet_header));
 183
 184         /* Make sure we are at least 2 pages since 1 page is used for control */
 185         /* ASSERT(driver->RingBufferSize >= (PAGE_SIZE << 1)); */
 186
 187         drv->name = gDriverName;
 188         memcpy(&drv->deviceType, &gNetVscDeviceType, sizeof(struct hv_guid));
 189
 190         /* Make sure it is set by the caller */
 191         /* FIXME: These probably should still be tested in some way */
 192         /* ASSERT(driver->OnReceiveCallback); */
 193         /* ASSERT(driver->OnLinkStatusChanged); */
 194
 195         /* Setup the dispatch table */
 196         driver->Base.OnDeviceAdd        = NetVscOnDeviceAdd;
 197         driver->Base.OnDeviceRemove     = NetVscOnDeviceRemove;
 198         driver->Base.OnCleanup          = NetVscOnCleanup;
 199
 200         driver->OnSend                  = NetVscOnSend;
 201
 202         RndisFilterInit(driver);
 203
 204         DPRINT_EXIT(NETVSC);
 205
 206         return 0;
 207 }
 208
 209 static int NetVscInitializeReceiveBufferWithNetVsp(struct hv_device *Device)
 210 {
 211         int ret = 0;
 212         struct netvsc_device *netDevice;
 213         struct nvsp_message *initPacket;
 214
 215         netDevice = GetOutboundNetDevice(Device);
 216         if (!netDevice) {
 217                 DPRINT_ERR(NETVSC, "unable to get net device..."
 218                            "device being destroyed?");
 219                 DPRINT_EXIT(NETVSC);
 220                 return -1;
 221         }
 222         /* ASSERT(netDevice->ReceiveBufferSize > 0); */
 223         /* page-size grandularity */
 224         /* ASSERT((netDevice->ReceiveBufferSize & (PAGE_SIZE - 1)) == 0); */
 225
 226         netDevice->ReceiveBuffer =
 227                 osd_PageAlloc(netDevice->ReceiveBufferSize >> PAGE_SHIFT);
 228         if (!netDevice->ReceiveBuffer) {
 229                 DPRINT_ERR(NETVSC,
 230                            "unable to allocate receive buffer of size %d",
 231                            netDevice->ReceiveBufferSize);
 232                 ret = -1;
 233                 goto Cleanup;
 234         }
 235         /* page-aligned buffer */
 236         /* ASSERT(((unsigned long)netDevice->ReceiveBuffer & (PAGE_SIZE - 1)) == */
 237         /*      0); */
 238
 239         DPRINT_INFO(NETVSC, "Establishing receive buffer's GPADL...");
 240
 241         /*
 242          * Establish the gpadl handle for this buffer on this
 243          * channel.  Note: This call uses the vmbus connection rather
 244          * than the channel to establish the gpadl handle.
 245          */
 246         ret = Device->Driver->VmbusChannelInterface.EstablishGpadl(Device,
 247                                         netDevice->ReceiveBuffer,
 248                                         netDevice->ReceiveBufferSize,
 249                                         &netDevice->ReceiveBufferGpadlHandle);
 250         if (ret != 0) {
 251                 DPRINT_ERR(NETVSC,
 252                            "unable to establish receive buffer's gpadl");
 253                 goto Cleanup;
 254         }
 255
 256         /* osd_WaitEventWait(ext->ChannelInitEvent); */
 257
 258         /* Notify the NetVsp of the gpadl handle */
 259         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendReceiveBuffer...");
 260
 261         initPacket = &netDevice->ChannelInitPacket;
 262
 263         memset(initPacket, 0, sizeof(struct nvsp_message));
 264
 265         initPacket->Header.MessageType = NvspMessage1TypeSendReceiveBuffer;
 266         initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->ReceiveBufferGpadlHandle;
 267         initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
 268
 269         /* Send the gpadl notification request */
 270         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 271                                 initPacket,
 272                                 sizeof(struct nvsp_message),
 273                                 (unsigned long)initPacket,
 274                                 VmbusPacketTypeDataInBand,
 275                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 276         if (ret != 0) {
 277                 DPRINT_ERR(NETVSC,
 278                            "unable to send receive buffer's gpadl to netvsp");
 279                 goto Cleanup;
 280         }
 281
 282         osd_WaitEventWait(netDevice->ChannelInitEvent);
 283
 284         /* Check the response */
 285         if (initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status != NvspStatusSuccess) {
 286                 DPRINT_ERR(NETVSC, "Unable to complete receive buffer "
 287                            "initialzation with NetVsp - status %d",
 288                            initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status);
 289                 ret = -1;
 290                 goto Cleanup;
 291         }
 292
 293         /* Parse the response */
 294         /* ASSERT(netDevice->ReceiveSectionCount == 0); */
 295         /* ASSERT(netDevice->ReceiveSections == NULL); */
 296
 297         netDevice->ReceiveSectionCount = initPacket->Messages.Version1Messages.SendReceiveBufferComplete.NumSections;
 298
 299         netDevice->ReceiveSections = kmalloc(netDevice->ReceiveSectionCount * sizeof(struct nvsp_1_receive_buffer_section), GFP_KERNEL);
 300         if (netDevice->ReceiveSections == NULL) {
 301                 ret = -1;
 302                 goto Cleanup;
 303         }
 304
 305         memcpy(netDevice->ReceiveSections,
 306                 initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Sections,
 307                 netDevice->ReceiveSectionCount * sizeof(struct nvsp_1_receive_buffer_section));
 308
 309         DPRINT_INFO(NETVSC, "Receive sections info (count %d, offset %d, "
 310                     "endoffset %d, suballoc size %d, num suballocs %d)",
 311                     netDevice->ReceiveSectionCount,
 312                     netDevice->ReceiveSections[0].Offset,
 313                     netDevice->ReceiveSections[0].EndOffset,
 314                     netDevice->ReceiveSections[0].SubAllocationSize,
 315                     netDevice->ReceiveSections[0].NumSubAllocations);
 316
 317         /*
 318          * For 1st release, there should only be 1 section that represents the
 319          * entire receive buffer
 320          */
 321         if (netDevice->ReceiveSectionCount != 1 ||
 322             netDevice->ReceiveSections->Offset != 0) {
 323                 ret = -1;
 324                 goto Cleanup;
 325         }
 326
 327         goto Exit;
 328
 329 Cleanup:
 330         NetVscDestroyReceiveBuffer(netDevice);
 331
 332 Exit:
 333         PutNetDevice(Device);
 334         DPRINT_EXIT(NETVSC);
 335         return ret;
 336 }
 337
 338 static int NetVscInitializeSendBufferWithNetVsp(struct hv_device *Device)
 339 {
 340         int ret = 0;
 341         struct netvsc_device *netDevice;
 342         struct nvsp_message *initPacket;
 343
 344         netDevice = GetOutboundNetDevice(Device);
 345         if (!netDevice) {
 346                 DPRINT_ERR(NETVSC, "unable to get net device..."
 347                            "device being destroyed?");
 348                 DPRINT_EXIT(NETVSC);
 349                 return -1;
 350         }
 351         if (netDevice->SendBufferSize <= 0) {
 352                 ret = -EINVAL;
 353                 goto Cleanup;
 354         }
 355
 356         /* page-size grandularity */
 357         /* ASSERT((netDevice->SendBufferSize & (PAGE_SIZE - 1)) == 0); */
 358
 359         netDevice->SendBuffer =
 360                 osd_PageAlloc(netDevice->SendBufferSize >> PAGE_SHIFT);
 361         if (!netDevice->SendBuffer) {
 362                 DPRINT_ERR(NETVSC, "unable to allocate send buffer of size %d",
 363                            netDevice->SendBufferSize);
 364                 ret = -1;
 365                 goto Cleanup;
 366         }
 367         /* page-aligned buffer */
 368         /* ASSERT(((unsigned long)netDevice->SendBuffer & (PAGE_SIZE - 1)) == 0); */
 369
 370         DPRINT_INFO(NETVSC, "Establishing send buffer's GPADL...");
 371
 372         /*
 373          * Establish the gpadl handle for this buffer on this
 374          * channel.  Note: This call uses the vmbus connection rather
 375          * than the channel to establish the gpadl handle.
 376          */
 377         ret = Device->Driver->VmbusChannelInterface.EstablishGpadl(Device,
 378                                         netDevice->SendBuffer,
 379                                         netDevice->SendBufferSize,
 380                                         &netDevice->SendBufferGpadlHandle);
 381         if (ret != 0) {
 382                 DPRINT_ERR(NETVSC, "unable to establish send buffer's gpadl");
 383                 goto Cleanup;
 384         }
 385
 386         /* osd_WaitEventWait(ext->ChannelInitEvent); */
 387
 388         /* Notify the NetVsp of the gpadl handle */
 389         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendSendBuffer...");
 390
 391         initPacket = &netDevice->ChannelInitPacket;
 392
 393         memset(initPacket, 0, sizeof(struct nvsp_message));
 394
 395         initPacket->Header.MessageType = NvspMessage1TypeSendSendBuffer;
 396         initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->SendBufferGpadlHandle;
 397         initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_SEND_BUFFER_ID;
 398
 399         /* Send the gpadl notification request */
 400         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 401                                 initPacket, sizeof(struct nvsp_message),
 402                                 (unsigned long)initPacket,
 403                                 VmbusPacketTypeDataInBand,
 404                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 405         if (ret != 0) {
 406                 DPRINT_ERR(NETVSC,
 407                            "unable to send receive buffer's gpadl to netvsp");
 408                 goto Cleanup;
 409         }
 410
 411         osd_WaitEventWait(netDevice->ChannelInitEvent);
 412
 413         /* Check the response */
 414         if (initPacket->Messages.Version1Messages.SendSendBufferComplete.Status != NvspStatusSuccess) {
 415                 DPRINT_ERR(NETVSC, "Unable to complete send buffer "
 416                            "initialzation with NetVsp - status %d",
 417                            initPacket->Messages.Version1Messages.SendSendBufferComplete.Status);
 418                 ret = -1;
 419                 goto Cleanup;
 420         }
 421
 422         netDevice->SendSectionSize = initPacket->Messages.Version1Messages.SendSendBufferComplete.SectionSize;
 423
 424         goto Exit;
 425
 426 Cleanup:
 427         NetVscDestroySendBuffer(netDevice);
 428
 429 Exit:
 430         PutNetDevice(Device);
 431         DPRINT_EXIT(NETVSC);
 432         return ret;
 433 }
 434
 435 static int NetVscDestroyReceiveBuffer(struct netvsc_device *NetDevice)
 436 {
 437         struct nvsp_message *revokePacket;
 438         int ret = 0;
 439
 440         /*
 441          * If we got a section count, it means we received a
 442          * SendReceiveBufferComplete msg (ie sent
 443          * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 444          * to send a revoke msg here
 445          */
 446         if (NetDevice->ReceiveSectionCount) {
 447                 DPRINT_INFO(NETVSC,
 448                             "Sending NvspMessage1TypeRevokeReceiveBuffer...");
 449
 450                 /* Send the revoke receive buffer */
 451                 revokePacket = &NetDevice->RevokePacket;
 452                 memset(revokePacket, 0, sizeof(struct nvsp_message));
 453
 454                 revokePacket->Header.MessageType = NvspMessage1TypeRevokeReceiveBuffer;
 455                 revokePacket->Messages.Version1Messages.RevokeReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
 456
 457                 ret = NetDevice->Device->Driver->VmbusChannelInterface.SendPacket(
 458                                                 NetDevice->Device,
 459                                                 revokePacket,
 460                                                 sizeof(struct nvsp_message),
 461                                                 (unsigned long)revokePacket,
 462                                                 VmbusPacketTypeDataInBand, 0);
 463                 /*
 464                  * If we failed here, we might as well return and
 465                  * have a leak rather than continue and a bugchk
 466                  */
 467                 if (ret != 0) {
 468                         DPRINT_ERR(NETVSC, "unable to send revoke receive "
 469                                    "buffer to netvsp");
 470                         DPRINT_EXIT(NETVSC);
 471                         return -1;
 472                 }
 473         }
 474
 475         /* Teardown the gpadl on the vsp end */
 476         if (NetDevice->ReceiveBufferGpadlHandle) {
 477                 DPRINT_INFO(NETVSC, "Tearing down receive buffer's GPADL...");
 478
 479                 ret = NetDevice->Device->Driver->VmbusChannelInterface.TeardownGpadl(
 480                                         NetDevice->Device,
 481                                         NetDevice->ReceiveBufferGpadlHandle);
 482
 483                 /* If we failed here, we might as well return and have a leak rather than continue and a bugchk */
 484                 if (ret != 0) {
 485                         DPRINT_ERR(NETVSC,
 486                                    "unable to teardown receive buffer's gpadl");
 487                         DPRINT_EXIT(NETVSC);
 488                         return -1;
 489                 }
 490                 NetDevice->ReceiveBufferGpadlHandle = 0;
 491         }
 492
 493         if (NetDevice->ReceiveBuffer) {
 494                 DPRINT_INFO(NETVSC, "Freeing up receive buffer...");
 495
 496                 /* Free up the receive buffer */
 497                 osd_PageFree(NetDevice->ReceiveBuffer,
 498                              NetDevice->ReceiveBufferSize >> PAGE_SHIFT);
 499                 NetDevice->ReceiveBuffer = NULL;
 500         }
 501
 502         if (NetDevice->ReceiveSections) {
 503                 NetDevice->ReceiveSectionCount = 0;
 504                 kfree(NetDevice->ReceiveSections);
 505                 NetDevice->ReceiveSections = NULL;
 506         }
 507
 508         DPRINT_EXIT(NETVSC);
 509
 510         return ret;
 511 }
 512
 513 static int NetVscDestroySendBuffer(struct netvsc_device *NetDevice)
 514 {
 515         struct nvsp_message *revokePacket;
 516         int ret = 0;
 517
 518         /*
 519          * If we got a section count, it means we received a
 520          *  SendReceiveBufferComplete msg (ie sent
 521          *  NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 522          *  to send a revoke msg here
 523          */
 524         if (NetDevice->SendSectionSize) {
 525                 DPRINT_INFO(NETVSC,
 526                             "Sending NvspMessage1TypeRevokeSendBuffer...");
 527
 528                 /* Send the revoke send buffer */
 529                 revokePacket = &NetDevice->RevokePacket;
 530                 memset(revokePacket, 0, sizeof(struct nvsp_message));
 531
 532                 revokePacket->Header.MessageType = NvspMessage1TypeRevokeSendBuffer;
 533                 revokePacket->Messages.Version1Messages.RevokeSendBuffer.Id = NETVSC_SEND_BUFFER_ID;
 534
 535                 ret = NetDevice->Device->Driver->VmbusChannelInterface.SendPacket(NetDevice->Device,
 536                                         revokePacket,
 537                                         sizeof(struct nvsp_message),
 538                                         (unsigned long)revokePacket,
 539                                         VmbusPacketTypeDataInBand, 0);
 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 send revoke send buffer "
 546                                    "to netvsp");
 547                         DPRINT_EXIT(NETVSC);
 548                         return -1;
 549                 }
 550         }
 551
 552         /* Teardown the gpadl on the vsp end */
 553         if (NetDevice->SendBufferGpadlHandle) {
 554                 DPRINT_INFO(NETVSC, "Tearing down send buffer's GPADL...");
 555
 556                 ret = NetDevice->Device->Driver->VmbusChannelInterface.TeardownGpadl(NetDevice->Device, NetDevice->SendBufferGpadlHandle);
 557
 558                 /*
 559                  * If we failed here, we might as well return and have a leak
 560                  * rather than continue and a bugchk
 561                  */
 562                 if (ret != 0) {
 563                         DPRINT_ERR(NETVSC, "unable to teardown send buffer's "
 564                                    "gpadl");
 565                         DPRINT_EXIT(NETVSC);
 566                         return -1;
 567                 }
 568                 NetDevice->SendBufferGpadlHandle = 0;
 569         }
 570
 571         if (NetDevice->SendBuffer) {
 572                 DPRINT_INFO(NETVSC, "Freeing up send buffer...");
 573
 574                 /* Free up the receive buffer */
 575                 osd_PageFree(NetDevice->SendBuffer,
 576                              NetDevice->SendBufferSize >> PAGE_SHIFT);
 577                 NetDevice->SendBuffer = NULL;
 578         }
 579
 580         DPRINT_EXIT(NETVSC);
 581
 582         return ret;
 583 }
 584
 585
 586 static int NetVscConnectToVsp(struct hv_device *Device)
 587 {
 588         int ret;
 589         struct netvsc_device *netDevice;
 590         struct nvsp_message *initPacket;
 591         int ndisVersion;
 592
 593         netDevice = GetOutboundNetDevice(Device);
 594         if (!netDevice) {
 595                 DPRINT_ERR(NETVSC, "unable to get net device..."
 596                            "device being destroyed?");
 597                 DPRINT_EXIT(NETVSC);
 598                 return -1;
 599         }
 600
 601         initPacket = &netDevice->ChannelInitPacket;
 602
 603         memset(initPacket, 0, sizeof(struct nvsp_message));
 604         initPacket->Header.MessageType = NvspMessageTypeInit;
 605         initPacket->Messages.InitMessages.Init.MinProtocolVersion = NVSP_MIN_PROTOCOL_VERSION;
 606         initPacket->Messages.InitMessages.Init.MaxProtocolVersion = NVSP_MAX_PROTOCOL_VERSION;
 607
 608         DPRINT_INFO(NETVSC, "Sending NvspMessageTypeInit...");
 609
 610         /* Send the init request */
 611         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 612                                 initPacket,
 613                                 sizeof(struct nvsp_message),
 614                                 (unsigned long)initPacket,
 615                                 VmbusPacketTypeDataInBand,
 616                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 617
 618         if (ret != 0) {
 619                 DPRINT_ERR(NETVSC, "unable to send NvspMessageTypeInit");
 620                 goto Cleanup;
 621         }
 622
 623         osd_WaitEventWait(netDevice->ChannelInitEvent);
 624
 625         /* Now, check the response */
 626         /* ASSERT(initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength <= MAX_MULTIPAGE_BUFFER_COUNT); */
 627         DPRINT_INFO(NETVSC, "NvspMessageTypeInit status(%d) max mdl chain (%d)",
 628                 initPacket->Messages.InitMessages.InitComplete.Status,
 629                 initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength);
 630
 631         if (initPacket->Messages.InitMessages.InitComplete.Status !=
 632             NvspStatusSuccess) {
 633                 DPRINT_ERR(NETVSC,
 634                         "unable to initialize with netvsp (status 0x%x)",
 635                         initPacket->Messages.InitMessages.InitComplete.Status);
 636                 ret = -1;
 637                 goto Cleanup;
 638         }
 639
 640         if (initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion != NVSP_PROTOCOL_VERSION_1) {
 641                 DPRINT_ERR(NETVSC, "unable to initialize with netvsp "
 642                            "(version expected 1 got %d)",
 643                            initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion);
 644                 ret = -1;
 645                 goto Cleanup;
 646         }
 647         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendNdisVersion...");
 648
 649         /* Send the ndis version */
 650         memset(initPacket, 0, sizeof(struct nvsp_message));
 651
 652         ndisVersion = 0x00050000;
 653
 654         initPacket->Header.MessageType = NvspMessage1TypeSendNdisVersion;
 655         initPacket->Messages.Version1Messages.SendNdisVersion.NdisMajorVersion =
 656                                 (ndisVersion & 0xFFFF0000) >> 16;
 657         initPacket->Messages.Version1Messages.SendNdisVersion.NdisMinorVersion =
 658                                 ndisVersion & 0xFFFF;
 659
 660         /* Send the init request */
 661         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 662                                         initPacket,
 663                                         sizeof(struct nvsp_message),
 664                                         (unsigned long)initPacket,
 665                                         VmbusPacketTypeDataInBand, 0);
 666         if (ret != 0) {
 667                 DPRINT_ERR(NETVSC,
 668                            "unable to send NvspMessage1TypeSendNdisVersion");
 669                 ret = -1;
 670                 goto Cleanup;
 671         }
 672         /*
 673          * BUGBUG - We have to wait for the above msg since the
 674          * netvsp uses KMCL which acknowledges packet (completion
 675          * packet) since our Vmbus always set the
 676          * VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED flag
 677          */
 678          /* osd_WaitEventWait(NetVscChannel->ChannelInitEvent); */
 679
 680         /* Post the big receive buffer to NetVSP */
 681         ret = NetVscInitializeReceiveBufferWithNetVsp(Device);
 682         if (ret == 0)
 683                 ret = NetVscInitializeSendBufferWithNetVsp(Device);
 684
 685 Cleanup:
 686         PutNetDevice(Device);
 687         DPRINT_EXIT(NETVSC);
 688         return ret;
 689 }
 690
 691 static void NetVscDisconnectFromVsp(struct netvsc_device *NetDevice)
 692 {
 693         NetVscDestroyReceiveBuffer(NetDevice);
 694         NetVscDestroySendBuffer(NetDevice);
 695
 696         DPRINT_EXIT(NETVSC);
 697 }
 698
 699 /*
 700  * NetVscOnDeviceAdd - Callback when the device belonging to this driver is added
 701  */
 702 static int NetVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo)
 703 {
 704         int ret = 0;
 705         int i;
 706         struct netvsc_device *netDevice;
 707         struct hv_netvsc_packet *packet, *pos;
 708         struct netvsc_driver *netDriver =
 709                                 (struct netvsc_driver *)Device->Driver;
 710
 711         netDevice = AllocNetDevice(Device);
 712         if (!netDevice) {
 713                 ret = -1;
 714                 goto Cleanup;
 715         }
 716
 717         DPRINT_DBG(NETVSC, "netvsc channel object allocated - %p", netDevice);
 718
 719         /* Initialize the NetVSC channel extension */
 720         netDevice->ReceiveBufferSize = NETVSC_RECEIVE_BUFFER_SIZE;
 721         spin_lock_init(&netDevice->receive_packet_list_lock);
 722
 723         netDevice->SendBufferSize = NETVSC_SEND_BUFFER_SIZE;
 724
 725         INIT_LIST_HEAD(&netDevice->ReceivePacketList);
 726
 727         for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
 728                 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
 729                                  (NETVSC_RECEIVE_SG_COUNT *
 730                                   sizeof(struct hv_page_buffer)), GFP_KERNEL);
 731                 if (!packet) {
 732                         DPRINT_DBG(NETVSC, "unable to allocate netvsc pkts "
 733                                    "for receive pool (wanted %d got %d)",
 734                                    NETVSC_RECEIVE_PACKETLIST_COUNT, i);
 735                         break;
 736                 }
 737                 list_add_tail(&packet->ListEntry,
 738                               &netDevice->ReceivePacketList);
 739         }
 740         netDevice->ChannelInitEvent = osd_WaitEventCreate();
 741         if (!netDevice->ChannelInitEvent) {
 742                 ret = -ENOMEM;
 743                 goto Cleanup;
 744         }
 745
 746         /* Open the channel */
 747         ret = Device->Driver->VmbusChannelInterface.Open(Device,
 748                                                 netDriver->RingBufferSize,
 749                                                 netDriver->RingBufferSize,
 750                                                 NULL, 0,
 751                                                 NetVscOnChannelCallback,
 752                                                 Device);
 753
 754         if (ret != 0) {
 755                 DPRINT_ERR(NETVSC, "unable to open channel: %d", ret);
 756                 ret = -1;
 757                 goto Cleanup;
 758         }
 759
 760         /* Channel is opened */
 761         DPRINT_INFO(NETVSC, "*** NetVSC channel opened successfully! ***");
 762
 763         /* Connect with the NetVsp */
 764         ret = NetVscConnectToVsp(Device);
 765         if (ret != 0) {
 766                 DPRINT_ERR(NETVSC, "unable to connect to NetVSP - %d", ret);
 767                 ret = -1;
 768                 goto Close;
 769         }
 770
 771         DPRINT_INFO(NETVSC, "*** NetVSC channel handshake result - %d ***",
 772                     ret);
 773
 774         DPRINT_EXIT(NETVSC);
 775         return ret;
 776
 777 Close:
 778         /* Now, we can close the channel safely */
 779         Device->Driver->VmbusChannelInterface.Close(Device);
 780
 781 Cleanup:
 782
 783         if (netDevice) {
 784                 kfree(netDevice->ChannelInitEvent);
 785
 786                 list_for_each_entry_safe(packet, pos,
 787                                          &netDevice->ReceivePacketList,
 788                                          ListEntry) {
 789                         list_del(&packet->ListEntry);
 790                         kfree(packet);
 791                 }
 792
 793                 ReleaseOutboundNetDevice(Device);
 794                 ReleaseInboundNetDevice(Device);
 795
 796                 FreeNetDevice(netDevice);
 797         }
 798
 799         DPRINT_EXIT(NETVSC);
 800         return ret;
 801 }
 802
 803 /*
 804  * NetVscOnDeviceRemove - Callback when the root bus device is removed
 805  */
 806 static int NetVscOnDeviceRemove(struct hv_device *Device)
 807 {
 808         struct netvsc_device *netDevice;
 809         struct hv_netvsc_packet *netvscPacket, *pos;
 810
 811         DPRINT_INFO(NETVSC, "Disabling outbound traffic on net device (%p)...",
 812                     Device->Extension);
 813
 814         /* Stop outbound traffic ie sends and receives completions */
 815         netDevice = ReleaseOutboundNetDevice(Device);
 816         if (!netDevice) {
 817                 DPRINT_ERR(NETVSC, "No net device present!!");
 818                 return -1;
 819         }
 820
 821         /* Wait for all send completions */
 822         while (atomic_read(&netDevice->NumOutstandingSends)) {
 823                 DPRINT_INFO(NETVSC, "waiting for %d requests to complete...",
 824                             atomic_read(&netDevice->NumOutstandingSends));
 825                 udelay(100);
 826         }
 827
 828         DPRINT_INFO(NETVSC, "Disconnecting from netvsp...");
 829
 830         NetVscDisconnectFromVsp(netDevice);
 831
 832         DPRINT_INFO(NETVSC, "Disabling inbound traffic on net device (%p)...",
 833                     Device->Extension);
 834
 835         /* Stop inbound traffic ie receives and sends completions */
 836         netDevice = ReleaseInboundNetDevice(Device);
 837
 838         /* At this point, no one should be accessing netDevice except in here */
 839         DPRINT_INFO(NETVSC, "net device (%p) safe to remove", netDevice);
 840
 841         /* Now, we can close the channel safely */
 842         Device->Driver->VmbusChannelInterface.Close(Device);
 843
 844         /* Release all resources */
 845         list_for_each_entry_safe(netvscPacket, pos,
 846                                  &netDevice->ReceivePacketList, ListEntry) {
 847                 list_del(&netvscPacket->ListEntry);
 848                 kfree(netvscPacket);
 849         }
 850
 851         kfree(netDevice->ChannelInitEvent);
 852         FreeNetDevice(netDevice);
 853
 854         DPRINT_EXIT(NETVSC);
 855         return 0;
 856 }
 857
 858 /*
 859  * NetVscOnCleanup - Perform any cleanup when the driver is removed
 860  */
 861 static void NetVscOnCleanup(struct hv_driver *drv)
 862 {
 863         DPRINT_EXIT(NETVSC);
 864 }
 865
 866 static void NetVscOnSendCompletion(struct hv_device *Device,
 867                                    struct vmpacket_descriptor *Packet)
 868 {
 869         struct netvsc_device *netDevice;
 870         struct nvsp_message *nvspPacket;
 871         struct hv_netvsc_packet *nvscPacket;
 872
 873         netDevice = GetInboundNetDevice(Device);
 874         if (!netDevice) {
 875                 DPRINT_ERR(NETVSC, "unable to get net device..."
 876                            "device being destroyed?");
 877                 DPRINT_EXIT(NETVSC);
 878                 return;
 879         }
 880
 881         nvspPacket = (struct nvsp_message *)((unsigned long)Packet + (Packet->DataOffset8 << 3));
 882
 883         DPRINT_DBG(NETVSC, "send completion packet - type %d",
 884                    nvspPacket->Header.MessageType);
 885
 886         if ((nvspPacket->Header.MessageType == NvspMessageTypeInitComplete) ||
 887             (nvspPacket->Header.MessageType ==
 888              NvspMessage1TypeSendReceiveBufferComplete) ||
 889             (nvspPacket->Header.MessageType ==
 890              NvspMessage1TypeSendSendBufferComplete)) {
 891                 /* Copy the response back */
 892                 memcpy(&netDevice->ChannelInitPacket, nvspPacket,
 893                        sizeof(struct nvsp_message));
 894                 osd_WaitEventSet(netDevice->ChannelInitEvent);
 895         } else if (nvspPacket->Header.MessageType ==
 896                    NvspMessage1TypeSendRNDISPacketComplete) {
 897                 /* Get the send context */
 898                 nvscPacket = (struct hv_netvsc_packet *)(unsigned long)Packet->TransactionId;
 899                 /* ASSERT(nvscPacket); */
 900
 901                 /* Notify the layer above us */
 902                 nvscPacket->Completion.Send.OnSendCompletion(nvscPacket->Completion.Send.SendCompletionContext);
 903
 904                 atomic_dec(&netDevice->NumOutstandingSends);
 905         } else {
 906                 DPRINT_ERR(NETVSC, "Unknown send completion packet type - "
 907                            "%d received!!", nvspPacket->Header.MessageType);
 908         }
 909
 910         PutNetDevice(Device);
 911         DPRINT_EXIT(NETVSC);
 912 }
 913
 914 static int NetVscOnSend(struct hv_device *Device,
 915                         struct hv_netvsc_packet *Packet)
 916 {
 917         struct netvsc_device *netDevice;
 918         int ret = 0;
 919
 920         struct nvsp_message sendMessage;
 921
 922         netDevice = GetOutboundNetDevice(Device);
 923         if (!netDevice) {
 924                 DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
 925                            "ignoring outbound packets", netDevice);
 926                 DPRINT_EXIT(NETVSC);
 927                 return -2;
 928         }
 929
 930         sendMessage.Header.MessageType = NvspMessage1TypeSendRNDISPacket;
 931         if (Packet->IsDataPacket) {
 932                 /* 0 is RMC_DATA; */
 933                 sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 0;
 934         } else {
 935                 /* 1 is RMC_CONTROL; */
 936                 sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 1;
 937         }
 938
 939         /* Not using send buffer section */
 940         sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionIndex = 0xFFFFFFFF;
 941         sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionSize = 0;
 942
 943         if (Packet->PageBufferCount) {
 944                 ret = Device->Driver->VmbusChannelInterface.SendPacketPageBuffer(
 945                                         Device, Packet->PageBuffers,
 946                                         Packet->PageBufferCount,
 947                                         &sendMessage,
 948                                         sizeof(struct nvsp_message),
 949                                         (unsigned long)Packet);
 950         } else {
 951                 ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 952                                 &sendMessage,
 953                                 sizeof(struct nvsp_message),
 954                                 (unsigned long)Packet,
 955                                 VmbusPacketTypeDataInBand,
 956                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 957
 958         }
 959
 960         if (ret != 0)
 961                 DPRINT_ERR(NETVSC, "Unable to send packet %p ret %d",
 962                            Packet, ret);
 963
 964         atomic_inc(&netDevice->NumOutstandingSends);
 965         PutNetDevice(Device);
 966
 967         DPRINT_EXIT(NETVSC);
 968         return ret;
 969 }
 970
 971 static void NetVscOnReceive(struct hv_device *Device,
 972                             struct vmpacket_descriptor *Packet)
 973 {
 974         struct netvsc_device *netDevice;
 975         struct vmtransfer_page_packet_header *vmxferpagePacket;
 976         struct nvsp_message *nvspPacket;
 977         struct hv_netvsc_packet *netvscPacket = NULL;
 978         unsigned long start;
 979         unsigned long end, endVirtual;
 980         /* struct netvsc_driver *netvscDriver; */
 981         struct xferpage_packet *xferpagePacket = NULL;
 982         int i, j;
 983         int count = 0, bytesRemain = 0;
 984         unsigned long flags;
 985         LIST_HEAD(listHead);
 986
 987         netDevice = GetInboundNetDevice(Device);
 988         if (!netDevice) {
 989                 DPRINT_ERR(NETVSC, "unable to get net device..."
 990                            "device being destroyed?");
 991                 DPRINT_EXIT(NETVSC);
 992                 return;
 993         }
 994
 995         /*
 996          * All inbound packets other than send completion should be xfer page
 997          * packet
 998          */
 999         if (Packet->Type != VmbusPacketTypeDataUsingTransferPages) {
1000                 DPRINT_ERR(NETVSC, "Unknown packet type received - %d",
1001                            Packet->Type);
1002                 PutNetDevice(Device);
1003                 return;
1004         }
1005
1006         nvspPacket = (struct nvsp_message *)((unsigned long)Packet +
1007                         (Packet->DataOffset8 << 3));
1008
1009         /* Make sure this is a valid nvsp packet */
1010         if (nvspPacket->Header.MessageType != NvspMessage1TypeSendRNDISPacket) {
1011                 DPRINT_ERR(NETVSC, "Unknown nvsp packet type received - %d",
1012                            nvspPacket->Header.MessageType);
1013                 PutNetDevice(Device);
1014                 return;
1015         }
1016
1017         DPRINT_DBG(NETVSC, "NVSP packet received - type %d",
1018                    nvspPacket->Header.MessageType);
1019
1020         vmxferpagePacket = (struct vmtransfer_page_packet_header *)Packet;
1021
1022         if (vmxferpagePacket->TransferPageSetId != NETVSC_RECEIVE_BUFFER_ID) {
1023                 DPRINT_ERR(NETVSC, "Invalid xfer page set id - "
1024                            "expecting %x got %x", NETVSC_RECEIVE_BUFFER_ID,
1025                            vmxferpagePacket->TransferPageSetId);
1026                 PutNetDevice(Device);
1027                 return;
1028         }
1029
1030         DPRINT_DBG(NETVSC, "xfer page - range count %d",
1031                    vmxferpagePacket->RangeCount);
1032
1033         /*
1034          * Grab free packets (range count + 1) to represent this xfer
1035          * page packet. +1 to represent the xfer page packet itself.
1036          * We grab it here so that we know exactly how many we can
1037          * fulfil
1038          */
1039         spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1040         while (!list_empty(&netDevice->ReceivePacketList)) {
1041                 list_move_tail(netDevice->ReceivePacketList.next, &listHead);
1042                 if (++count == vmxferpagePacket->RangeCount + 1)
1043                         break;
1044         }
1045         spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
1046
1047         /*
1048          * We need at least 2 netvsc pkts (1 to represent the xfer
1049          * page and at least 1 for the range) i.e. we can handled
1050          * some of the xfer page packet ranges...
1051          */
1052         if (count < 2) {
1053                 DPRINT_ERR(NETVSC, "Got only %d netvsc pkt...needed %d pkts. "
1054                            "Dropping this xfer page packet completely!",
1055                            count, vmxferpagePacket->RangeCount + 1);
1056
1057                 /* Return it to the freelist */
1058                 spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1059                 for (i = count; i != 0; i--) {
1060                         list_move_tail(listHead.next,
1061                                        &netDevice->ReceivePacketList);
1062                 }
1063                 spin_unlock_irqrestore(&netDevice->receive_packet_list_lock,
1064                                        flags);
1065
1066                 NetVscSendReceiveCompletion(Device,
1067                                             vmxferpagePacket->d.TransactionId);
1068
1069                 PutNetDevice(Device);
1070                 return;
1071         }
1072
1073         /* Remove the 1st packet to represent the xfer page packet itself */
1074         xferpagePacket = (struct xferpage_packet *)listHead.next;
1075         list_del(&xferpagePacket->ListEntry);
1076
1077         /* This is how much we can satisfy */
1078         xferpagePacket->Count = count - 1;
1079         /* ASSERT(xferpagePacket->Count > 0 && xferpagePacket->Count <= */
1080         /*      vmxferpagePacket->RangeCount); */
1081
1082         if (xferpagePacket->Count != vmxferpagePacket->RangeCount) {
1083                 DPRINT_INFO(NETVSC, "Needed %d netvsc pkts to satisy this xfer "
1084                             "page...got %d", vmxferpagePacket->RangeCount,
1085                             xferpagePacket->Count);
1086         }
1087
1088         /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1089         for (i = 0; i < (count - 1); i++) {
1090                 netvscPacket = (struct hv_netvsc_packet *)listHead.next;
1091                 list_del(&netvscPacket->ListEntry);
1092
1093                 /* Initialize the netvsc packet */
1094                 netvscPacket->XferPagePacket = xferpagePacket;
1095                 netvscPacket->Completion.Recv.OnReceiveCompletion =
1096                                         NetVscOnReceiveCompletion;
1097                 netvscPacket->Completion.Recv.ReceiveCompletionContext =
1098                                         netvscPacket;
1099                 netvscPacket->Device = Device;
1100                 /* Save this so that we can send it back */
1101                 netvscPacket->Completion.Recv.ReceiveCompletionTid =
1102                                         vmxferpagePacket->d.TransactionId;
1103
1104                 netvscPacket->TotalDataBufferLength =
1105                                         vmxferpagePacket->Ranges[i].ByteCount;
1106                 netvscPacket->PageBufferCount = 1;
1107
1108                 /* ASSERT(vmxferpagePacket->Ranges[i].ByteOffset + */
1109                 /*      vmxferpagePacket->Ranges[i].ByteCount < */
1110                 /*      netDevice->ReceiveBufferSize); */
1111
1112                 netvscPacket->PageBuffers[0].Length =
1113                                         vmxferpagePacket->Ranges[i].ByteCount;
1114
1115                 start = virt_to_phys((void *)((unsigned long)netDevice->ReceiveBuffer + vmxferpagePacket->Ranges[i].ByteOffset));
1116
1117                 netvscPacket->PageBuffers[0].Pfn = start >> PAGE_SHIFT;
1118                 endVirtual = (unsigned long)netDevice->ReceiveBuffer
1119                     + vmxferpagePacket->Ranges[i].ByteOffset
1120                     + vmxferpagePacket->Ranges[i].ByteCount - 1;
1121                 end = virt_to_phys((void *)endVirtual);
1122
1123                 /* Calculate the page relative offset */
1124                 netvscPacket->PageBuffers[0].Offset =
1125                         vmxferpagePacket->Ranges[i].ByteOffset & (PAGE_SIZE - 1);
1126                 if ((end >> PAGE_SHIFT) != (start >> PAGE_SHIFT)) {
1127                         /* Handle frame across multiple pages: */
1128                         netvscPacket->PageBuffers[0].Length =
1129                                 (netvscPacket->PageBuffers[0].Pfn << PAGE_SHIFT)
1130                                 + PAGE_SIZE - start;
1131                         bytesRemain = netvscPacket->TotalDataBufferLength -
1132                                         netvscPacket->PageBuffers[0].Length;
1133                         for (j = 1; j < NETVSC_PACKET_MAXPAGE; j++) {
1134                                 netvscPacket->PageBuffers[j].Offset = 0;
1135                                 if (bytesRemain <= PAGE_SIZE) {
1136                                         netvscPacket->PageBuffers[j].Length = bytesRemain;
1137                                         bytesRemain = 0;
1138                                 } else {
1139                                         netvscPacket->PageBuffers[j].Length = PAGE_SIZE;
1140                                         bytesRemain -= PAGE_SIZE;
1141                                 }
1142                                 netvscPacket->PageBuffers[j].Pfn =
1143                                     virt_to_phys((void *)(endVirtual - bytesRemain)) >> PAGE_SHIFT;
1144                                 netvscPacket->PageBufferCount++;
1145                                 if (bytesRemain == 0)
1146                                         break;
1147                         }
1148                         /* ASSERT(bytesRemain == 0); */
1149                 }
1150                 DPRINT_DBG(NETVSC, "[%d] - (abs offset %u len %u) => "
1151                            "(pfn %llx, offset %u, len %u)", i,
1152                            vmxferpagePacket->Ranges[i].ByteOffset,
1153                            vmxferpagePacket->Ranges[i].ByteCount,
1154                            netvscPacket->PageBuffers[0].Pfn,
1155                            netvscPacket->PageBuffers[0].Offset,
1156                            netvscPacket->PageBuffers[0].Length);
1157
1158                 /* Pass it to the upper layer */
1159                 ((struct netvsc_driver *)Device->Driver)->OnReceiveCallback(Device, netvscPacket);
1160
1161                 NetVscOnReceiveCompletion(netvscPacket->Completion.Recv.ReceiveCompletionContext);
1162         }
1163
1164         /* ASSERT(list_empty(&listHead)); */
1165
1166         PutNetDevice(Device);
1167         DPRINT_EXIT(NETVSC);
1168 }
1169
1170 static void NetVscSendReceiveCompletion(struct hv_device *Device,
1171                                         u64 TransactionId)
1172 {
1173         struct nvsp_message recvcompMessage;
1174         int retries = 0;
1175         int ret;
1176
1177         DPRINT_DBG(NETVSC, "Sending receive completion pkt - %llx",
1178                    TransactionId);
1179
1180         recvcompMessage.Header.MessageType =
1181                                 NvspMessage1TypeSendRNDISPacketComplete;
1182
1183         /* FIXME: Pass in the status */
1184         recvcompMessage.Messages.Version1Messages.SendRNDISPacketComplete.Status = NvspStatusSuccess;
1185
1186 retry_send_cmplt:
1187         /* Send the completion */
1188         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
1189                                         &recvcompMessage,
1190                                         sizeof(struct nvsp_message),
1191                                         TransactionId,
1192                                         VmbusPacketTypeCompletion, 0);
1193         if (ret == 0) {
1194                 /* success */
1195                 /* no-op */
1196         } else if (ret == -1) {
1197                 /* no more room...wait a bit and attempt to retry 3 times */
1198                 retries++;
1199                 DPRINT_ERR(NETVSC, "unable to send receive completion pkt "
1200                            "(tid %llx)...retrying %d", TransactionId, retries);
1201
1202                 if (retries < 4) {
1203                         udelay(100);
1204                         goto retry_send_cmplt;
1205                 } else {
1206                         DPRINT_ERR(NETVSC, "unable to send receive completion "
1207                                   "pkt (tid %llx)...give up retrying",
1208                                   TransactionId);
1209                 }
1210         } else {
1211                 DPRINT_ERR(NETVSC, "unable to send receive completion pkt - "
1212                            "%llx", TransactionId);
1213         }
1214 }
1215
1216 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
1217 static void NetVscOnReceiveCompletion(void *Context)
1218 {
1219         struct hv_netvsc_packet *packet = Context;
1220         struct hv_device *device = (struct hv_device *)packet->Device;
1221         struct netvsc_device *netDevice;
1222         u64 transactionId = 0;
1223         bool fSendReceiveComp = false;
1224         unsigned long flags;
1225
1226         /* ASSERT(packet->XferPagePacket); */
1227
1228         /*
1229          * Even though it seems logical to do a GetOutboundNetDevice() here to
1230          * send out receive completion, we are using GetInboundNetDevice()
1231          * since we may have disable outbound traffic already.
1232          */
1233         netDevice = GetInboundNetDevice(device);
1234         if (!netDevice) {
1235                 DPRINT_ERR(NETVSC, "unable to get net device..."
1236                            "device being destroyed?");
1237                 DPRINT_EXIT(NETVSC);
1238                 return;
1239         }
1240
1241         /* Overloading use of the lock. */
1242         spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1243
1244         /* ASSERT(packet->XferPagePacket->Count > 0); */
1245         packet->XferPagePacket->Count--;
1246
1247         /*
1248          * Last one in the line that represent 1 xfer page packet.
1249          * Return the xfer page packet itself to the freelist
1250          */
1251         if (packet->XferPagePacket->Count == 0) {
1252                 fSendReceiveComp = true;
1253                 transactionId = packet->Completion.Recv.ReceiveCompletionTid;
1254                 list_add_tail(&packet->XferPagePacket->ListEntry,
1255                               &netDevice->ReceivePacketList);
1256
1257         }
1258
1259         /* Put the packet back */
1260         list_add_tail(&packet->ListEntry, &netDevice->ReceivePacketList);
1261         spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
1262
1263         /* Send a receive completion for the xfer page packet */
1264         if (fSendReceiveComp)
1265                 NetVscSendReceiveCompletion(device, transactionId);
1266
1267         PutNetDevice(device);
1268         DPRINT_EXIT(NETVSC);
1269 }
1270
1271 static void NetVscOnChannelCallback(void *Context)
1272 {
1273         int ret;
1274         struct hv_device *device = Context;
1275         struct netvsc_device *netDevice;
1276         u32 bytesRecvd;
1277         u64 requestId;
1278         unsigned char *packet;
1279         struct vmpacket_descriptor *desc;
1280         unsigned char *buffer;
1281         int bufferlen = NETVSC_PACKET_SIZE;
1282
1283         /* ASSERT(device); */
1284
1285         packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
1286                          GFP_KERNEL);
1287         if (!packet)
1288                 return;
1289         buffer = packet;
1290
1291         netDevice = GetInboundNetDevice(device);
1292         if (!netDevice) {
1293                 DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
1294                            "ignoring inbound packets", netDevice);
1295                 DPRINT_EXIT(NETVSC);
1296                 goto out;
1297         }
1298
1299         do {
1300                 ret = device->Driver->VmbusChannelInterface.RecvPacketRaw(
1301                                                 device, buffer, bufferlen,
1302                                                 &bytesRecvd, &requestId);
1303                 if (ret == 0) {
1304                         if (bytesRecvd > 0) {
1305                                 DPRINT_DBG(NETVSC, "receive %d bytes, tid %llx",
1306                                            bytesRecvd, requestId);
1307
1308                                 desc = (struct vmpacket_descriptor *)buffer;
1309                                 switch (desc->Type) {
1310                                 case VmbusPacketTypeCompletion:
1311                                         NetVscOnSendCompletion(device, desc);
1312                                         break;
1313
1314                                 case VmbusPacketTypeDataUsingTransferPages:
1315                                         NetVscOnReceive(device, desc);
1316                                         break;
1317
1318                                 default:
1319                                         DPRINT_ERR(NETVSC,
1320                                                    "unhandled packet type %d, "
1321                                                    "tid %llx len %d\n",
1322                                                    desc->Type, requestId,
1323                                                    bytesRecvd);
1324                                         break;
1325                                 }
1326
1327                                 /* reset */
1328                                 if (bufferlen > NETVSC_PACKET_SIZE) {
1329                                         kfree(buffer);
1330                                         buffer = packet;
1331                                         bufferlen = NETVSC_PACKET_SIZE;
1332                                 }
1333                         } else {
1334                                 /* reset */
1335                                 if (bufferlen > NETVSC_PACKET_SIZE) {
1336                                         kfree(buffer);
1337                                         buffer = packet;
1338                                         bufferlen = NETVSC_PACKET_SIZE;
1339                                 }
1340
1341                                 break;
1342                         }
1343                 } else if (ret == -2) {
1344                         /* Handle large packet */
1345                         buffer = kmalloc(bytesRecvd, GFP_ATOMIC);
1346                         if (buffer == NULL) {
1347                                 /* Try again next time around */
1348                                 DPRINT_ERR(NETVSC,
1349                                            "unable to allocate buffer of size "
1350                                            "(%d)!!", bytesRecvd);
1351                                 break;
1352                         }
1353
1354                         bufferlen = bytesRecvd;
1355                 }
1356         } while (1);
1357
1358         PutNetDevice(device);
1359         DPRINT_EXIT(NETVSC);
1360 out:
1361         kfree(buffer);
1362         return;
1363 }