SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/staging/hv/NetVsc.c

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  *
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/delay.h>
  26 #include "include/logging.h"
  27 #include "NetVsc.h"
  28 #include "RndisFilter.h"
  29
  30
  31 /* Globals */
  32 static const char* gDriverName="netvsc";
  33
  34 /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  35 static const GUID gNetVscDeviceType={
  36         .Data = {0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46, 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E}
  37 };
  38
  39
  40 /* Internal routines */
  41 static int
  42 NetVscOnDeviceAdd(
  43         DEVICE_OBJECT   *Device,
  44         void                    *AdditionalInfo
  45         );
  46
  47 static int
  48 NetVscOnDeviceRemove(
  49         DEVICE_OBJECT *Device
  50         );
  51
  52 static void
  53 NetVscOnCleanup(
  54         DRIVER_OBJECT *Driver
  55         );
  56
  57 static void
  58 NetVscOnChannelCallback(
  59         void * context
  60         );
  61
  62 static int
  63 NetVscInitializeSendBufferWithNetVsp(
  64         DEVICE_OBJECT                   *Device
  65         );
  66
  67 static int
  68 NetVscInitializeReceiveBufferWithNetVsp(
  69         DEVICE_OBJECT                   *Device
  70         );
  71
  72 static int
  73 NetVscDestroySendBuffer(
  74         NETVSC_DEVICE   *NetDevice
  75         );
  76
  77 static int
  78 NetVscDestroyReceiveBuffer(
  79         NETVSC_DEVICE   *NetDevice
  80         );
  81
  82 static int
  83 NetVscConnectToVsp(
  84         DEVICE_OBJECT           *Device
  85         );
  86
  87 static void
  88 NetVscOnSendCompletion(
  89         DEVICE_OBJECT           *Device,
  90         VMPACKET_DESCRIPTOR *Packet
  91         );
  92
  93 static int
  94 NetVscOnSend(
  95         DEVICE_OBJECT   *Device,
  96         NETVSC_PACKET   *Packet
  97         );
  98
  99 static void
 100 NetVscOnReceive(
 101         DEVICE_OBJECT           *Device,
 102         VMPACKET_DESCRIPTOR *Packet
 103         );
 104
 105 static void
 106 NetVscOnReceiveCompletion(
 107         void * Context
 108         );
 109
 110 static void
 111 NetVscSendReceiveCompletion(
 112         DEVICE_OBJECT   *Device,
 113         u64                     TransactionId
 114         );
 115
 116 static inline NETVSC_DEVICE* AllocNetDevice(DEVICE_OBJECT *Device)
 117 {
 118         NETVSC_DEVICE *netDevice;
 119
 120         netDevice = kzalloc(sizeof(NETVSC_DEVICE), GFP_KERNEL);
 121         if (!netDevice)
 122                 return NULL;
 123
 124         /* Set to 2 to allow both inbound and outbound traffic */
 125         InterlockedCompareExchange(&netDevice->RefCount, 2, 0);
 126
 127         netDevice->Device = Device;
 128         Device->Extension = netDevice;
 129
 130         return netDevice;
 131 }
 132
 133 static inline void FreeNetDevice(NETVSC_DEVICE *Device)
 134 {
 135         ASSERT(Device->RefCount == 0);
 136         Device->Device->Extension = NULL;
 137         kfree(Device);
 138 }
 139
 140
 141 /* Get the net device object iff exists and its refcount > 1 */
 142 static inline NETVSC_DEVICE* GetOutboundNetDevice(DEVICE_OBJECT *Device)
 143 {
 144         NETVSC_DEVICE *netDevice;
 145
 146         netDevice = (NETVSC_DEVICE*)Device->Extension;
 147         if (netDevice && netDevice->RefCount > 1)
 148         {
 149                 InterlockedIncrement(&netDevice->RefCount);
 150         }
 151         else
 152         {
 153                 netDevice = NULL;
 154         }
 155
 156         return netDevice;
 157 }
 158
 159 /* Get the net device object iff exists and its refcount > 0 */
 160 static inline NETVSC_DEVICE* GetInboundNetDevice(DEVICE_OBJECT  *Device)
 161 {
 162         NETVSC_DEVICE *netDevice;
 163
 164         netDevice = (NETVSC_DEVICE*)Device->Extension;
 165         if (netDevice && netDevice->RefCount)
 166         {
 167                 InterlockedIncrement(&netDevice->RefCount);
 168         }
 169         else
 170         {
 171                 netDevice = NULL;
 172         }
 173
 174         return netDevice;
 175 }
 176
 177 static inline void PutNetDevice(DEVICE_OBJECT *Device)
 178 {
 179         NETVSC_DEVICE *netDevice;
 180
 181         netDevice = (NETVSC_DEVICE*)Device->Extension;
 182         ASSERT(netDevice);
 183
 184         InterlockedDecrement(&netDevice->RefCount);
 185 }
 186
 187 static inline NETVSC_DEVICE* ReleaseOutboundNetDevice(DEVICE_OBJECT *Device)
 188 {
 189         NETVSC_DEVICE *netDevice;
 190
 191         netDevice = (NETVSC_DEVICE*)Device->Extension;
 192         if (netDevice == NULL)
 193                 return NULL;
 194
 195         /* Busy wait until the ref drop to 2, then set it to 1 */
 196         while (InterlockedCompareExchange(&netDevice->RefCount, 1, 2) != 2)
 197         {
 198                 udelay(100);
 199         }
 200
 201         return netDevice;
 202 }
 203
 204 static inline NETVSC_DEVICE* ReleaseInboundNetDevice(DEVICE_OBJECT *Device)
 205 {
 206         NETVSC_DEVICE *netDevice;
 207
 208         netDevice = (NETVSC_DEVICE*)Device->Extension;
 209         if (netDevice == NULL)
 210                 return NULL;
 211
 212         /* Busy wait until the ref drop to 1, then set it to 0 */
 213         while (InterlockedCompareExchange(&netDevice->RefCount, 0, 1) != 1)
 214         {
 215                 udelay(100);
 216         }
 217
 218         Device->Extension = NULL;
 219         return netDevice;
 220 }
 221
 222 /*++;
 223
 224
 225 Name:
 226         NetVscInitialize()
 227
 228 Description:
 229         Main entry point
 230
 231 --*/
 232 int
 233 NetVscInitialize(
 234         DRIVER_OBJECT *drv
 235         )
 236 {
 237         NETVSC_DRIVER_OBJECT* driver = (NETVSC_DRIVER_OBJECT*)drv;
 238         int ret=0;
 239
 240         DPRINT_ENTER(NETVSC);
 241
 242         DPRINT_DBG(NETVSC, "sizeof(NETVSC_PACKET)=%ld, sizeof(NVSP_MESSAGE)=%ld, sizeof(VMTRANSFER_PAGE_PACKET_HEADER)=%ld",
 243                 sizeof(NETVSC_PACKET), sizeof(NVSP_MESSAGE), sizeof(VMTRANSFER_PAGE_PACKET_HEADER));
 244
 245         /* Make sure we are at least 2 pages since 1 page is used for control */
 246         ASSERT(driver->RingBufferSize >= (PAGE_SIZE << 1));
 247
 248         drv->name = gDriverName;
 249         memcpy(&drv->deviceType, &gNetVscDeviceType, sizeof(GUID));
 250
 251         /* Make sure it is set by the caller */
 252         ASSERT(driver->OnReceiveCallback);
 253         ASSERT(driver->OnLinkStatusChanged);
 254
 255         /* Setup the dispatch table */
 256         driver->Base.OnDeviceAdd                = NetVscOnDeviceAdd;
 257         driver->Base.OnDeviceRemove             = NetVscOnDeviceRemove;
 258         driver->Base.OnCleanup                  = NetVscOnCleanup;
 259
 260         driver->OnSend                                  = NetVscOnSend;
 261
 262         RndisFilterInit(driver);
 263
 264         DPRINT_EXIT(NETVSC);
 265
 266         return ret;
 267 }
 268
 269 static int
 270 NetVscInitializeReceiveBufferWithNetVsp(
 271         DEVICE_OBJECT   *Device
 272         )
 273 {
 274         int ret=0;
 275         NETVSC_DEVICE *netDevice;
 276         NVSP_MESSAGE *initPacket;
 277
 278         DPRINT_ENTER(NETVSC);
 279
 280         netDevice = GetOutboundNetDevice(Device);
 281         if (!netDevice)
 282         {
 283                 DPRINT_ERR(NETVSC, "unable to get net device...device being destroyed?");
 284                 DPRINT_EXIT(NETVSC);
 285                 return -1;
 286         }
 287         ASSERT(netDevice->ReceiveBufferSize > 0);
 288         ASSERT((netDevice->ReceiveBufferSize & (PAGE_SIZE-1)) == 0); /* page-size grandularity */
 289
 290         netDevice->ReceiveBuffer = PageAlloc(netDevice->ReceiveBufferSize >> PAGE_SHIFT);
 291         if (!netDevice->ReceiveBuffer)
 292         {
 293                 DPRINT_ERR(NETVSC, "unable to allocate receive buffer of size %d", netDevice->ReceiveBufferSize);
 294                 ret = -1;
 295                 goto Cleanup;
 296         }
 297         ASSERT(((unsigned long)netDevice->ReceiveBuffer & (PAGE_SIZE-1)) == 0); /* page-aligned buffer */
 298
 299         DPRINT_INFO(NETVSC, "Establishing receive buffer's GPADL...");
 300
 301         /*
 302          * Establish the gpadl handle for this buffer on this
 303          * channel.  Note: This call uses the vmbus connection rather
 304          * than the channel to establish the gpadl handle.
 305          */
 306         ret = Device->Driver->VmbusChannelInterface.EstablishGpadl(Device,
 307                                                                                                                                 netDevice->ReceiveBuffer,
 308                                                                                                                                 netDevice->ReceiveBufferSize,
 309                                                                                                                                 &netDevice->ReceiveBufferGpadlHandle);
 310
 311         if (ret != 0)
 312         {
 313                 DPRINT_ERR(NETVSC, "unable to establish receive buffer's gpadl");
 314                 goto Cleanup;
 315         }
 316
 317         /* WaitEventWait(ext->ChannelInitEvent); */
 318
 319         /* Notify the NetVsp of the gpadl handle */
 320         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendReceiveBuffer...");
 321
 322         initPacket = &netDevice->ChannelInitPacket;
 323
 324         memset(initPacket, 0, sizeof(NVSP_MESSAGE));
 325
 326     initPacket->Header.MessageType = NvspMessage1TypeSendReceiveBuffer;
 327     initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->ReceiveBufferGpadlHandle;
 328     initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
 329
 330         /* Send the gpadl notification request */
 331         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 332                                                                                                                         initPacket,
 333                                                                                                                         sizeof(NVSP_MESSAGE),
 334                                                                                                                         (unsigned long)initPacket,
 335                                                                                                                         VmbusPacketTypeDataInBand,
 336                                                                                                                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 337         if (ret != 0)
 338         {
 339                 DPRINT_ERR(NETVSC, "unable to send receive buffer's gpadl to netvsp");
 340                 goto Cleanup;
 341         }
 342
 343         WaitEventWait(netDevice->ChannelInitEvent);
 344
 345         /* Check the response */
 346         if (initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status != NvspStatusSuccess)
 347         {
 348                 DPRINT_ERR(NETVSC,
 349                         "Unable to complete receive buffer initialzation with NetVsp - status %d",
 350                         initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status);
 351                 ret = -1;
 352                 goto Cleanup;
 353         }
 354
 355         /* Parse the response */
 356         ASSERT(netDevice->ReceiveSectionCount == 0);
 357         ASSERT(netDevice->ReceiveSections == NULL);
 358
 359         netDevice->ReceiveSectionCount = initPacket->Messages.Version1Messages.SendReceiveBufferComplete.NumSections;
 360
 361         netDevice->ReceiveSections = kmalloc(netDevice->ReceiveSectionCount * sizeof(NVSP_1_RECEIVE_BUFFER_SECTION), GFP_KERNEL);
 362         if (netDevice->ReceiveSections == NULL)
 363         {
 364                 ret = -1;
 365                 goto Cleanup;
 366         }
 367
 368         memcpy(netDevice->ReceiveSections,
 369                 initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Sections,
 370                 netDevice->ReceiveSectionCount * sizeof(NVSP_1_RECEIVE_BUFFER_SECTION));
 371
 372         DPRINT_INFO(NETVSC,
 373                 "Receive sections info (count %d, offset %d, endoffset %d, suballoc size %d, num suballocs %d)",
 374                 netDevice->ReceiveSectionCount, netDevice->ReceiveSections[0].Offset, netDevice->ReceiveSections[0].EndOffset,
 375                 netDevice->ReceiveSections[0].SubAllocationSize, netDevice->ReceiveSections[0].NumSubAllocations);
 376
 377
 378         /* For 1st release, there should only be 1 section that represents the entire receive buffer */
 379         if (netDevice->ReceiveSectionCount != 1 ||
 380                 netDevice->ReceiveSections->Offset != 0 )
 381         {
 382                 ret = -1;
 383                 goto Cleanup;
 384         }
 385
 386         goto Exit;
 387
 388 Cleanup:
 389         NetVscDestroyReceiveBuffer(netDevice);
 390
 391 Exit:
 392         PutNetDevice(Device);
 393         DPRINT_EXIT(NETVSC);
 394         return ret;
 395 }
 396
 397
 398 static int
 399 NetVscInitializeSendBufferWithNetVsp(
 400         DEVICE_OBJECT   *Device
 401         )
 402 {
 403         int ret=0;
 404         NETVSC_DEVICE *netDevice;
 405         NVSP_MESSAGE *initPacket;
 406
 407         DPRINT_ENTER(NETVSC);
 408
 409         netDevice = GetOutboundNetDevice(Device);
 410         if (!netDevice)
 411         {
 412                 DPRINT_ERR(NETVSC, "unable to get net device...device being destroyed?");
 413                 DPRINT_EXIT(NETVSC);
 414                 return -1;
 415         }
 416         ASSERT(netDevice->SendBufferSize > 0);
 417         ASSERT((netDevice->SendBufferSize & (PAGE_SIZE-1)) == 0); /* page-size grandularity */
 418
 419         netDevice->SendBuffer = PageAlloc(netDevice->SendBufferSize >> PAGE_SHIFT);
 420         if (!netDevice->SendBuffer)
 421         {
 422                 DPRINT_ERR(NETVSC, "unable to allocate send buffer of size %d", netDevice->SendBufferSize);
 423                 ret = -1;
 424                 goto Cleanup;
 425         }
 426         ASSERT(((unsigned long)netDevice->SendBuffer & (PAGE_SIZE-1)) == 0); /* page-aligned buffer */
 427
 428         DPRINT_INFO(NETVSC, "Establishing send buffer's GPADL...");
 429
 430         /*
 431          * Establish the gpadl handle for this buffer on this
 432          * channel.  Note: This call uses the vmbus connection rather
 433          * than the channel to establish the gpadl handle.
 434          */
 435         ret = Device->Driver->VmbusChannelInterface.EstablishGpadl(Device,
 436                                                                    netDevice->SendBuffer,
 437                                                                    netDevice->SendBufferSize,
 438                                                                    &netDevice->SendBufferGpadlHandle);
 439
 440         if (ret != 0)
 441         {
 442                 DPRINT_ERR(NETVSC, "unable to establish send buffer's gpadl");
 443                 goto Cleanup;
 444         }
 445
 446         /* WaitEventWait(ext->ChannelInitEvent); */
 447
 448         /* Notify the NetVsp of the gpadl handle */
 449         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendSendBuffer...");
 450
 451         initPacket = &netDevice->ChannelInitPacket;
 452
 453         memset(initPacket, 0, sizeof(NVSP_MESSAGE));
 454
 455     initPacket->Header.MessageType = NvspMessage1TypeSendSendBuffer;
 456     initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->SendBufferGpadlHandle;
 457     initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_SEND_BUFFER_ID;
 458
 459         /* Send the gpadl notification request */
 460         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 461                                                                                                                         initPacket,
 462                                                                                                                         sizeof(NVSP_MESSAGE),
 463                                                                                                                         (unsigned long)initPacket,
 464                                                                                                                         VmbusPacketTypeDataInBand,
 465                                                                                                                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 466         if (ret != 0)
 467         {
 468                 DPRINT_ERR(NETVSC, "unable to send receive buffer's gpadl to netvsp");
 469                 goto Cleanup;
 470         }
 471
 472         WaitEventWait(netDevice->ChannelInitEvent);
 473
 474         /* Check the response */
 475         if (initPacket->Messages.Version1Messages.SendSendBufferComplete.Status != NvspStatusSuccess)
 476         {
 477                 DPRINT_ERR(NETVSC,
 478                         "Unable to complete send buffer initialzation with NetVsp - status %d",
 479                         initPacket->Messages.Version1Messages.SendSendBufferComplete.Status);
 480                 ret = -1;
 481                 goto Cleanup;
 482         }
 483
 484         netDevice->SendSectionSize = initPacket->Messages.Version1Messages.SendSendBufferComplete.SectionSize;
 485
 486         goto Exit;
 487
 488 Cleanup:
 489         NetVscDestroySendBuffer(netDevice);
 490
 491 Exit:
 492         PutNetDevice(Device);
 493         DPRINT_EXIT(NETVSC);
 494         return ret;
 495 }
 496
 497 static int
 498 NetVscDestroyReceiveBuffer(
 499         NETVSC_DEVICE   *NetDevice
 500         )
 501 {
 502         NVSP_MESSAGE *revokePacket;
 503         int ret=0;
 504
 505
 506         DPRINT_ENTER(NETVSC);
 507
 508         /*
 509          * If we got a section count, it means we received a
 510          * SendReceiveBufferComplete msg (ie sent
 511          * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 512          * to send a revoke msg here
 513          */
 514         if (NetDevice->ReceiveSectionCount)
 515         {
 516                 DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeRevokeReceiveBuffer...");
 517
 518                 /* Send the revoke receive buffer */
 519                 revokePacket = &NetDevice->RevokePacket;
 520                 memset(revokePacket, 0, sizeof(NVSP_MESSAGE));
 521
 522                 revokePacket->Header.MessageType = NvspMessage1TypeRevokeReceiveBuffer;
 523                 revokePacket->Messages.Version1Messages.RevokeReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
 524
 525                 ret = NetDevice->Device->Driver->VmbusChannelInterface.SendPacket(NetDevice->Device,
 526                                                                                                                                                         revokePacket,
 527                                                                                                                                                         sizeof(NVSP_MESSAGE),
 528                                                                                                                                                         (unsigned long)revokePacket,
 529                                                                                                                                                         VmbusPacketTypeDataInBand,
 530                                                                                                                                                         0);
 531                 /*
 532                  * If we failed here, we might as well return and
 533                  * have a leak rather than continue and a bugchk
 534                  */
 535                 if (ret != 0)
 536                 {
 537                         DPRINT_ERR(NETVSC, "unable to send revoke receive buffer to netvsp");
 538                         DPRINT_EXIT(NETVSC);
 539                         return -1;
 540                 }
 541         }
 542
 543         /* Teardown the gpadl on the vsp end */
 544         if (NetDevice->ReceiveBufferGpadlHandle)
 545         {
 546                 DPRINT_INFO(NETVSC, "Tearing down receive buffer's GPADL...");
 547
 548                 ret = NetDevice->Device->Driver->VmbusChannelInterface.TeardownGpadl(NetDevice->Device,
 549                                                                                                                                                                 NetDevice->ReceiveBufferGpadlHandle);
 550
 551                 /* If we failed here, we might as well return and have a leak rather than continue and a bugchk */
 552                 if (ret != 0)
 553                 {
 554                         DPRINT_ERR(NETVSC, "unable to teardown receive buffer's gpadl");
 555                         DPRINT_EXIT(NETVSC);
 556                         return -1;
 557                 }
 558                 NetDevice->ReceiveBufferGpadlHandle = 0;
 559         }
 560
 561         if (NetDevice->ReceiveBuffer)
 562         {
 563                 DPRINT_INFO(NETVSC, "Freeing up receive buffer...");
 564
 565                 /* Free up the receive buffer */
 566                 PageFree(NetDevice->ReceiveBuffer, NetDevice->ReceiveBufferSize >> PAGE_SHIFT);
 567                 NetDevice->ReceiveBuffer = NULL;
 568         }
 569
 570         if (NetDevice->ReceiveSections)
 571         {
 572                 kfree(NetDevice->ReceiveSections);
 573                 NetDevice->ReceiveSections = NULL;
 574                 NetDevice->ReceiveSectionCount = 0;
 575         }
 576
 577         DPRINT_EXIT(NETVSC);
 578
 579         return ret;
 580 }
 581
 582
 583
 584
 585 static int
 586 NetVscDestroySendBuffer(
 587         NETVSC_DEVICE   *NetDevice
 588         )
 589 {
 590         NVSP_MESSAGE *revokePacket;
 591         int ret=0;
 592
 593
 594         DPRINT_ENTER(NETVSC);
 595
 596         /*
 597          * If we got a section count, it means we received a
 598          *  SendReceiveBufferComplete msg (ie sent
 599          *  NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 600          *  to send a revoke msg here
 601          */
 602         if (NetDevice->SendSectionSize)
 603         {
 604                 DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeRevokeSendBuffer...");
 605
 606                 /* Send the revoke send buffer */
 607                 revokePacket = &NetDevice->RevokePacket;
 608                 memset(revokePacket, 0, sizeof(NVSP_MESSAGE));
 609
 610                 revokePacket->Header.MessageType = NvspMessage1TypeRevokeSendBuffer;
 611                 revokePacket->Messages.Version1Messages.RevokeSendBuffer.Id = NETVSC_SEND_BUFFER_ID;
 612
 613                 ret = NetDevice->Device->Driver->VmbusChannelInterface.SendPacket(NetDevice->Device,
 614                                                                                                                                                         revokePacket,
 615                                                                                                                                                         sizeof(NVSP_MESSAGE),
 616                                                                                                                                                         (unsigned long)revokePacket,
 617                                                                                                                                                         VmbusPacketTypeDataInBand,
 618                                                                                                                                                         0);
 619                 /* If we failed here, we might as well return and have a leak rather than continue and a bugchk */
 620                 if (ret != 0)
 621                 {
 622                         DPRINT_ERR(NETVSC, "unable to send revoke send buffer to netvsp");
 623                         DPRINT_EXIT(NETVSC);
 624                         return -1;
 625                 }
 626         }
 627
 628         /* Teardown the gpadl on the vsp end */
 629         if (NetDevice->SendBufferGpadlHandle)
 630         {
 631                 DPRINT_INFO(NETVSC, "Tearing down send buffer's GPADL...");
 632
 633                 ret = NetDevice->Device->Driver->VmbusChannelInterface.TeardownGpadl(NetDevice->Device,
 634                                                                                                                                                                 NetDevice->SendBufferGpadlHandle);
 635
 636                 /* If we failed here, we might as well return and have a leak rather than continue and a bugchk */
 637                 if (ret != 0)
 638                 {
 639                         DPRINT_ERR(NETVSC, "unable to teardown send buffer's gpadl");
 640                         DPRINT_EXIT(NETVSC);
 641                         return -1;
 642                 }
 643                 NetDevice->SendBufferGpadlHandle = 0;
 644         }
 645
 646         if (NetDevice->SendBuffer)
 647         {
 648                 DPRINT_INFO(NETVSC, "Freeing up send buffer...");
 649
 650                 /* Free up the receive buffer */
 651                 PageFree(NetDevice->SendBuffer, NetDevice->SendBufferSize >> PAGE_SHIFT);
 652                 NetDevice->SendBuffer = NULL;
 653         }
 654
 655         DPRINT_EXIT(NETVSC);
 656
 657         return ret;
 658 }
 659
 660
 661
 662 static int
 663 NetVscConnectToVsp(
 664         DEVICE_OBJECT   *Device
 665         )
 666 {
 667         int ret=0;
 668         NETVSC_DEVICE *netDevice;
 669         NVSP_MESSAGE *initPacket;
 670         int ndisVersion;
 671
 672         DPRINT_ENTER(NETVSC);
 673
 674         netDevice = GetOutboundNetDevice(Device);
 675         if (!netDevice)
 676         {
 677                 DPRINT_ERR(NETVSC, "unable to get net device...device being destroyed?");
 678                 DPRINT_EXIT(NETVSC);
 679                 return -1;
 680         }
 681
 682         initPacket = &netDevice->ChannelInitPacket;
 683
 684         memset(initPacket, 0, sizeof(NVSP_MESSAGE));
 685         initPacket->Header.MessageType = NvspMessageTypeInit;
 686     initPacket->Messages.InitMessages.Init.MinProtocolVersion = NVSP_MIN_PROTOCOL_VERSION;
 687     initPacket->Messages.InitMessages.Init.MaxProtocolVersion = NVSP_MAX_PROTOCOL_VERSION;
 688
 689         DPRINT_INFO(NETVSC, "Sending NvspMessageTypeInit...");
 690
 691         /* Send the init request */
 692         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 693                                                                                                                         initPacket,
 694                                                                                                                         sizeof(NVSP_MESSAGE),
 695                                                                                                                         (unsigned long)initPacket,
 696                                                                                                                         VmbusPacketTypeDataInBand,
 697                                                                                                                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 698
 699         if( ret != 0)
 700         {
 701                 DPRINT_ERR(NETVSC, "unable to send NvspMessageTypeInit");
 702                 goto Cleanup;
 703         }
 704
 705         WaitEventWait(netDevice->ChannelInitEvent);
 706
 707         /* Now, check the response */
 708         /* ASSERT(initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength <= MAX_MULTIPAGE_BUFFER_COUNT); */
 709         DPRINT_INFO(NETVSC, "NvspMessageTypeInit status(%d) max mdl chain (%d)",
 710                 initPacket->Messages.InitMessages.InitComplete.Status,
 711                 initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength);
 712
 713         if (initPacket->Messages.InitMessages.InitComplete.Status != NvspStatusSuccess)
 714         {
 715                 DPRINT_ERR(NETVSC, "unable to initialize with netvsp (status 0x%x)", initPacket->Messages.InitMessages.InitComplete.Status);
 716                 ret = -1;
 717                 goto Cleanup;
 718         }
 719
 720         if (initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion != NVSP_PROTOCOL_VERSION_1)
 721         {
 722                 DPRINT_ERR(NETVSC, "unable to initialize with netvsp (version expected 1 got %d)",
 723                         initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion);
 724                 ret = -1;
 725                 goto Cleanup;
 726         }
 727         DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendNdisVersion...");
 728
 729         /* Send the ndis version */
 730         memset(initPacket, 0, sizeof(NVSP_MESSAGE));
 731
 732     ndisVersion = 0x00050000;
 733
 734     initPacket->Header.MessageType = NvspMessage1TypeSendNdisVersion;
 735     initPacket->Messages.Version1Messages.SendNdisVersion.NdisMajorVersion = (ndisVersion & 0xFFFF0000) >> 16;
 736     initPacket->Messages.Version1Messages.SendNdisVersion.NdisMinorVersion = ndisVersion & 0xFFFF;
 737
 738         /* Send the init request */
 739         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 740                                                                                                                         initPacket,
 741                                                                                                                         sizeof(NVSP_MESSAGE),
 742                                                                                                                         (unsigned long)initPacket,
 743                                                                                                                         VmbusPacketTypeDataInBand,
 744                                                                                                                         0);
 745         if (ret != 0)
 746         {
 747                 DPRINT_ERR(NETVSC, "unable to send NvspMessage1TypeSendNdisVersion");
 748                 ret = -1;
 749                 goto Cleanup;
 750         }
 751         /*
 752          * BUGBUG - We have to wait for the above msg since the
 753          * netvsp uses KMCL which acknowledges packet (completion
 754          * packet) since our Vmbus always set the
 755          * VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED flag
 756          */
 757          /* WaitEventWait(NetVscChannel->ChannelInitEvent); */
 758
 759         /* Post the big receive buffer to NetVSP */
 760         ret = NetVscInitializeReceiveBufferWithNetVsp(Device);
 761         if (ret == 0)
 762         {
 763                 ret = NetVscInitializeSendBufferWithNetVsp(Device);
 764         }
 765
 766 Cleanup:
 767         PutNetDevice(Device);
 768         DPRINT_EXIT(NETVSC);
 769         return ret;
 770 }
 771
 772 static void
 773 NetVscDisconnectFromVsp(
 774         NETVSC_DEVICE   *NetDevice
 775         )
 776 {
 777         DPRINT_ENTER(NETVSC);
 778
 779         NetVscDestroyReceiveBuffer(NetDevice);
 780         NetVscDestroySendBuffer(NetDevice);
 781
 782         DPRINT_EXIT(NETVSC);
 783 }
 784
 785
 786 /*++
 787
 788 Name:
 789         NetVscOnDeviceAdd()
 790
 791 Description:
 792         Callback when the device belonging to this driver is added
 793
 794 --*/
 795 int
 796 NetVscOnDeviceAdd(
 797         DEVICE_OBJECT   *Device,
 798         void                    *AdditionalInfo
 799         )
 800 {
 801         int ret=0;
 802         int i;
 803
 804         NETVSC_DEVICE* netDevice;
 805         NETVSC_PACKET* packet;
 806         LIST_ENTRY *entry;
 807
 808         NETVSC_DRIVER_OBJECT *netDriver = (NETVSC_DRIVER_OBJECT*) Device->Driver;;
 809
 810         DPRINT_ENTER(NETVSC);
 811
 812         netDevice = AllocNetDevice(Device);
 813         if (!netDevice)
 814         {
 815                 ret = -1;
 816                 goto Cleanup;
 817         }
 818
 819         DPRINT_DBG(NETVSC, "netvsc channel object allocated - %p", netDevice);
 820
 821         /* Initialize the NetVSC channel extension */
 822         netDevice->ReceiveBufferSize = NETVSC_RECEIVE_BUFFER_SIZE;
 823         spin_lock_init(&netDevice->receive_packet_list_lock);
 824
 825         netDevice->SendBufferSize = NETVSC_SEND_BUFFER_SIZE;
 826
 827         INITIALIZE_LIST_HEAD(&netDevice->ReceivePacketList);
 828
 829         for (i=0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++)
 830         {
 831                 packet = kzalloc(sizeof(NETVSC_PACKET) + (NETVSC_RECEIVE_SG_COUNT* sizeof(PAGE_BUFFER)), GFP_KERNEL);
 832                 if (!packet)
 833                 {
 834                         DPRINT_DBG(NETVSC, "unable to allocate netvsc pkts for receive pool (wanted %d got %d)", NETVSC_RECEIVE_PACKETLIST_COUNT, i);
 835                         break;
 836                 }
 837
 838                 INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &packet->ListEntry);
 839         }
 840         netDevice->ChannelInitEvent = WaitEventCreate();
 841
 842         /* Open the channel */
 843         ret = Device->Driver->VmbusChannelInterface.Open(Device,
 844                                                          netDriver->RingBufferSize,
 845                                                          netDriver->RingBufferSize,
 846                                                          NULL, 0,
 847                                                          NetVscOnChannelCallback,
 848                                                          Device
 849                                                          );
 850
 851         if (ret != 0)
 852         {
 853                 DPRINT_ERR(NETVSC, "unable to open channel: %d", ret);
 854                 ret = -1;
 855                 goto Cleanup;
 856         }
 857
 858         /* Channel is opened */
 859         DPRINT_INFO(NETVSC, "*** NetVSC channel opened successfully! ***");
 860
 861         /* Connect with the NetVsp */
 862         ret = NetVscConnectToVsp(Device);
 863         if (ret != 0)
 864         {
 865                 DPRINT_ERR(NETVSC, "unable to connect to NetVSP - %d", ret);
 866                 ret = -1;
 867                 goto Close;
 868         }
 869
 870         DPRINT_INFO(NETVSC, "*** NetVSC channel handshake result - %d ***", ret);
 871
 872         DPRINT_EXIT(NETVSC);
 873         return ret;
 874
 875 Close:
 876         /* Now, we can close the channel safely */
 877         Device->Driver->VmbusChannelInterface.Close(Device);
 878
 879 Cleanup:
 880
 881         if (netDevice)
 882         {
 883                 WaitEventClose(netDevice->ChannelInitEvent);
 884
 885                 while (!IsListEmpty(&netDevice->ReceivePacketList))
 886                 {
 887                         entry = REMOVE_HEAD_LIST(&netDevice->ReceivePacketList);
 888                         packet = CONTAINING_RECORD(entry, NETVSC_PACKET, ListEntry);
 889                         kfree(packet);
 890                 }
 891
 892                 ReleaseOutboundNetDevice(Device);
 893                 ReleaseInboundNetDevice(Device);
 894
 895                 FreeNetDevice(netDevice);
 896         }
 897
 898         DPRINT_EXIT(NETVSC);
 899         return ret;
 900 }
 901
 902
 903 /*++
 904
 905 Name:
 906         NetVscOnDeviceRemove()
 907
 908 Description:
 909         Callback when the root bus device is removed
 910
 911 --*/
 912 int
 913 NetVscOnDeviceRemove(
 914         DEVICE_OBJECT *Device
 915         )
 916 {
 917         NETVSC_DEVICE *netDevice;
 918         NETVSC_PACKET *netvscPacket;
 919         int ret=0;
 920         LIST_ENTRY *entry;
 921
 922         DPRINT_ENTER(NETVSC);
 923
 924         DPRINT_INFO(NETVSC, "Disabling outbound traffic on net device (%p)...", Device->Extension);
 925
 926         /* Stop outbound traffic ie sends and receives completions */
 927         netDevice = ReleaseOutboundNetDevice(Device);
 928         if (!netDevice)
 929         {
 930                 DPRINT_ERR(NETVSC, "No net device present!!");
 931                 return -1;
 932         }
 933
 934         /* Wait for all send completions */
 935         while (netDevice->NumOutstandingSends)
 936         {
 937                 DPRINT_INFO(NETVSC, "waiting for %d requests to complete...", netDevice->NumOutstandingSends);
 938
 939                 udelay(100);
 940         }
 941
 942         DPRINT_INFO(NETVSC, "Disconnecting from netvsp...");
 943
 944         NetVscDisconnectFromVsp(netDevice);
 945
 946         DPRINT_INFO(NETVSC, "Disabling inbound traffic on net device (%p)...", Device->Extension);
 947
 948         /* Stop inbound traffic ie receives and sends completions */
 949         netDevice = ReleaseInboundNetDevice(Device);
 950
 951         /* At this point, no one should be accessing netDevice except in here */
 952         DPRINT_INFO(NETVSC, "net device (%p) safe to remove", netDevice);
 953
 954         /* Now, we can close the channel safely */
 955         Device->Driver->VmbusChannelInterface.Close(Device);
 956
 957         /* Release all resources */
 958         while (!IsListEmpty(&netDevice->ReceivePacketList))
 959         {
 960                 entry = REMOVE_HEAD_LIST(&netDevice->ReceivePacketList);
 961                 netvscPacket = CONTAINING_RECORD(entry, NETVSC_PACKET, ListEntry);
 962
 963                 kfree(netvscPacket);
 964         }
 965
 966         WaitEventClose(netDevice->ChannelInitEvent);
 967         FreeNetDevice(netDevice);
 968
 969         DPRINT_EXIT(NETVSC);
 970         return ret;
 971 }
 972
 973
 974
 975 /*++
 976
 977 Name:
 978         NetVscOnCleanup()
 979
 980 Description:
 981         Perform any cleanup when the driver is removed
 982
 983 --*/
 984 void
 985 NetVscOnCleanup(
 986         DRIVER_OBJECT *drv
 987         )
 988 {
 989         DPRINT_ENTER(NETVSC);
 990
 991         DPRINT_EXIT(NETVSC);
 992 }
 993
 994 static void
 995 NetVscOnSendCompletion(
 996         DEVICE_OBJECT           *Device,
 997         VMPACKET_DESCRIPTOR *Packet
 998         )
 999 {
1000         NETVSC_DEVICE* netDevice;
1001         NVSP_MESSAGE *nvspPacket;
1002         NETVSC_PACKET *nvscPacket;
1003
1004         DPRINT_ENTER(NETVSC);
1005
1006         netDevice = GetInboundNetDevice(Device);
1007         if (!netDevice)
1008         {
1009                 DPRINT_ERR(NETVSC, "unable to get net device...device being destroyed?");
1010                 DPRINT_EXIT(NETVSC);
1011                 return;
1012         }
1013
1014         nvspPacket = (NVSP_MESSAGE*)((unsigned long)Packet + (Packet->DataOffset8 << 3));
1015
1016         DPRINT_DBG(NETVSC, "send completion packet - type %d", nvspPacket->Header.MessageType);
1017
1018         if (nvspPacket->Header.MessageType == NvspMessageTypeInitComplete ||
1019                 nvspPacket->Header.MessageType == NvspMessage1TypeSendReceiveBufferComplete ||
1020                 nvspPacket->Header.MessageType == NvspMessage1TypeSendSendBufferComplete)
1021         {
1022                 /* Copy the response back */
1023                 memcpy(&netDevice->ChannelInitPacket, nvspPacket, sizeof(NVSP_MESSAGE));
1024                 WaitEventSet(netDevice->ChannelInitEvent);
1025         }
1026         else if (nvspPacket->Header.MessageType == NvspMessage1TypeSendRNDISPacketComplete)
1027         {
1028                 /* Get the send context */
1029                 nvscPacket = (NETVSC_PACKET *)(unsigned long)Packet->TransactionId;
1030                 ASSERT(nvscPacket);
1031
1032                 /* Notify the layer above us */
1033                 nvscPacket->Completion.Send.OnSendCompletion(nvscPacket->Completion.Send.SendCompletionContext);
1034
1035                 InterlockedDecrement(&netDevice->NumOutstandingSends);
1036         }
1037         else
1038         {
1039                 DPRINT_ERR(NETVSC, "Unknown send completion packet type - %d received!!", nvspPacket->Header.MessageType);
1040         }
1041
1042         PutNetDevice(Device);
1043         DPRINT_EXIT(NETVSC);
1044 }
1045
1046
1047
1048 static int
1049 NetVscOnSend(
1050         DEVICE_OBJECT *Device,
1051         NETVSC_PACKET *Packet
1052         )
1053 {
1054         NETVSC_DEVICE* netDevice;
1055         int ret=0;
1056
1057         NVSP_MESSAGE sendMessage;
1058
1059         DPRINT_ENTER(NETVSC);
1060
1061         netDevice = GetOutboundNetDevice(Device);
1062         if (!netDevice)
1063         {
1064                 DPRINT_ERR(NETVSC, "net device (%p) shutting down...ignoring outbound packets", netDevice);
1065                 DPRINT_EXIT(NETVSC);
1066                 return -2;
1067         }
1068
1069         sendMessage.Header.MessageType = NvspMessage1TypeSendRNDISPacket;
1070         if (Packet->IsDataPacket)
1071             sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 0;/* 0 is RMC_DATA; */
1072         else
1073                 sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 1;/* 1 is RMC_CONTROL; */
1074
1075         /* Not using send buffer section */
1076     sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionIndex = 0xFFFFFFFF;
1077     sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionSize = 0;
1078
1079         if (Packet->PageBufferCount)
1080         {
1081                 ret = Device->Driver->VmbusChannelInterface.SendPacketPageBuffer(Device,
1082                                                                                                                                                         Packet->PageBuffers,
1083                                                                                                                                                         Packet->PageBufferCount,
1084                                                                                                                                                         &sendMessage,
1085                                                                                                                                                         sizeof(NVSP_MESSAGE),
1086                                                                                                                                                         (unsigned long)Packet);
1087         }
1088         else
1089         {
1090                 ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
1091                                                                                                                                 &sendMessage,
1092                                                                                                                                 sizeof(NVSP_MESSAGE),
1093                                                                                                                                 (unsigned long)Packet,
1094                                                                                                                                 VmbusPacketTypeDataInBand,
1095                                                                                                                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1096
1097         }
1098
1099         if (ret != 0)
1100         {
1101                 DPRINT_ERR(NETVSC, "Unable to send packet %p ret %d", Packet, ret);
1102         }
1103
1104         InterlockedIncrement(&netDevice->NumOutstandingSends);
1105         PutNetDevice(Device);
1106
1107         DPRINT_EXIT(NETVSC);
1108         return ret;
1109 }
1110
1111
1112 static void
1113 NetVscOnReceive(
1114         DEVICE_OBJECT           *Device,
1115         VMPACKET_DESCRIPTOR *Packet
1116         )
1117 {
1118         NETVSC_DEVICE* netDevice;
1119         VMTRANSFER_PAGE_PACKET_HEADER *vmxferpagePacket;
1120         NVSP_MESSAGE *nvspPacket;
1121         NETVSC_PACKET *netvscPacket=NULL;
1122         LIST_ENTRY* entry;
1123         unsigned long start;
1124         unsigned long end, endVirtual;
1125         /* NETVSC_DRIVER_OBJECT *netvscDriver; */
1126         XFERPAGE_PACKET *xferpagePacket=NULL;
1127         LIST_ENTRY listHead;
1128
1129         int i=0, j=0;
1130         int count=0, bytesRemain=0;
1131         unsigned long flags;
1132
1133         DPRINT_ENTER(NETVSC);
1134
1135         netDevice = GetInboundNetDevice(Device);
1136         if (!netDevice)
1137         {
1138                 DPRINT_ERR(NETVSC, "unable to get net device...device being destroyed?");
1139                 DPRINT_EXIT(NETVSC);
1140                 return;
1141         }
1142
1143         /* All inbound packets other than send completion should be xfer page packet */
1144         if (Packet->Type != VmbusPacketTypeDataUsingTransferPages)
1145         {
1146                 DPRINT_ERR(NETVSC, "Unknown packet type received - %d", Packet->Type);
1147                 PutNetDevice(Device);
1148                 return;
1149         }
1150
1151         nvspPacket = (NVSP_MESSAGE*)((unsigned long)Packet + (Packet->DataOffset8 << 3));
1152
1153         /* Make sure this is a valid nvsp packet */
1154         if (nvspPacket->Header.MessageType != NvspMessage1TypeSendRNDISPacket )
1155         {
1156                 DPRINT_ERR(NETVSC, "Unknown nvsp packet type received - %d", nvspPacket->Header.MessageType);
1157                 PutNetDevice(Device);
1158                 return;
1159         }
1160
1161         DPRINT_DBG(NETVSC, "NVSP packet received - type %d", nvspPacket->Header.MessageType);
1162
1163         vmxferpagePacket = (VMTRANSFER_PAGE_PACKET_HEADER*)Packet;
1164
1165         if (vmxferpagePacket->TransferPageSetId != NETVSC_RECEIVE_BUFFER_ID)
1166         {
1167                 DPRINT_ERR(NETVSC, "Invalid xfer page set id - expecting %x got %x", NETVSC_RECEIVE_BUFFER_ID, vmxferpagePacket->TransferPageSetId);
1168                 PutNetDevice(Device);
1169                 return;
1170         }
1171
1172         DPRINT_DBG(NETVSC, "xfer page - range count %d", vmxferpagePacket->RangeCount);
1173
1174         INITIALIZE_LIST_HEAD(&listHead);
1175
1176         /*
1177          * Grab free packets (range count + 1) to represent this xfer
1178          * page packet. +1 to represent the xfer page packet itself.
1179          * We grab it here so that we know exactly how many we can
1180          * fulfil
1181          */
1182         spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1183         while (!IsListEmpty(&netDevice->ReceivePacketList))
1184         {
1185                 entry = REMOVE_HEAD_LIST(&netDevice->ReceivePacketList);
1186                 netvscPacket = CONTAINING_RECORD(entry, NETVSC_PACKET, ListEntry);
1187
1188                 INSERT_TAIL_LIST(&listHead, &netvscPacket->ListEntry);
1189
1190                 if (++count == vmxferpagePacket->RangeCount + 1)
1191                         break;
1192         }
1193         spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
1194
1195         /*
1196          * We need at least 2 netvsc pkts (1 to represent the xfer
1197          * page and at least 1 for the range) i.e. we can handled
1198          * some of the xfer page packet ranges...
1199          */
1200         if (count < 2)
1201         {
1202                 DPRINT_ERR(NETVSC, "Got only %d netvsc pkt...needed %d pkts. Dropping this xfer page packet completely!", count, vmxferpagePacket->RangeCount+1);
1203
1204                 /* Return it to the freelist */
1205                 spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1206                 for (i=count; i != 0; i--)
1207                 {
1208                         entry = REMOVE_HEAD_LIST(&listHead);
1209                         netvscPacket = CONTAINING_RECORD(entry, NETVSC_PACKET, ListEntry);
1210
1211                         INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &netvscPacket->ListEntry);
1212                 }
1213                 spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
1214
1215                 NetVscSendReceiveCompletion(Device, vmxferpagePacket->d.TransactionId);
1216
1217                 PutNetDevice(Device);
1218                 return;
1219         }
1220
1221         /* Remove the 1st packet to represent the xfer page packet itself */
1222         entry = REMOVE_HEAD_LIST(&listHead);
1223         xferpagePacket = CONTAINING_RECORD(entry, XFERPAGE_PACKET, ListEntry);
1224         xferpagePacket->Count = count - 1; /* This is how much we can satisfy */
1225         ASSERT(xferpagePacket->Count > 0 && xferpagePacket->Count <= vmxferpagePacket->RangeCount);
1226
1227         if (xferpagePacket->Count != vmxferpagePacket->RangeCount)
1228         {
1229                 DPRINT_INFO(NETVSC, "Needed %d netvsc pkts to satisy this xfer page...got %d", vmxferpagePacket->RangeCount, xferpagePacket->Count);
1230         }
1231
1232         /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1233         for (i=0; i < (count - 1); i++)
1234         {
1235                 entry = REMOVE_HEAD_LIST(&listHead);
1236                 netvscPacket = CONTAINING_RECORD(entry, NETVSC_PACKET, ListEntry);
1237
1238                 /* Initialize the netvsc packet */
1239                 netvscPacket->XferPagePacket = xferpagePacket;
1240                 netvscPacket->Completion.Recv.OnReceiveCompletion = NetVscOnReceiveCompletion;
1241                 netvscPacket->Completion.Recv.ReceiveCompletionContext = netvscPacket;
1242                 netvscPacket->Device = Device;
1243                 netvscPacket->Completion.Recv.ReceiveCompletionTid = vmxferpagePacket->d.TransactionId; /* Save this so that we can send it back */
1244
1245                 netvscPacket->TotalDataBufferLength = vmxferpagePacket->Ranges[i].ByteCount;
1246                 netvscPacket->PageBufferCount = 1;
1247
1248                 ASSERT(vmxferpagePacket->Ranges[i].ByteOffset + vmxferpagePacket->Ranges[i].ByteCount < netDevice->ReceiveBufferSize);
1249
1250                 netvscPacket->PageBuffers[0].Length = vmxferpagePacket->Ranges[i].ByteCount;
1251
1252                 start = GetPhysicalAddress((void*)((unsigned long)netDevice->ReceiveBuffer + vmxferpagePacket->Ranges[i].ByteOffset));
1253
1254                 netvscPacket->PageBuffers[0].Pfn = start >> PAGE_SHIFT;
1255                 endVirtual = (unsigned long)netDevice->ReceiveBuffer
1256                     + vmxferpagePacket->Ranges[i].ByteOffset
1257                     + vmxferpagePacket->Ranges[i].ByteCount -1;
1258                 end = GetPhysicalAddress((void*)endVirtual);
1259
1260                 /* Calculate the page relative offset */
1261                 netvscPacket->PageBuffers[0].Offset = vmxferpagePacket->Ranges[i].ByteOffset & (PAGE_SIZE -1);
1262                 if ((end >> PAGE_SHIFT) != (start>>PAGE_SHIFT)) {
1263                     /* Handle frame across multiple pages: */
1264                     netvscPacket->PageBuffers[0].Length =
1265                         (netvscPacket->PageBuffers[0].Pfn <<PAGE_SHIFT) + PAGE_SIZE - start;
1266                     bytesRemain = netvscPacket->TotalDataBufferLength - netvscPacket->PageBuffers[0].Length;
1267                     for (j=1; j<NETVSC_PACKET_MAXPAGE; j++) {
1268                         netvscPacket->PageBuffers[j].Offset = 0;
1269                         if (bytesRemain <= PAGE_SIZE) {
1270                             netvscPacket->PageBuffers[j].Length = bytesRemain;
1271                             bytesRemain = 0;
1272                         } else {
1273                             netvscPacket->PageBuffers[j].Length = PAGE_SIZE;
1274                             bytesRemain -= PAGE_SIZE;
1275                         }
1276                         netvscPacket->PageBuffers[j].Pfn =
1277                             GetPhysicalAddress((void*)(endVirtual - bytesRemain)) >> PAGE_SHIFT;
1278                         netvscPacket->PageBufferCount++;
1279                         if (bytesRemain == 0)
1280                             break;
1281                     }
1282                     ASSERT(bytesRemain == 0);
1283                 }
1284                 DPRINT_DBG(NETVSC, "[%d] - (abs offset %u len %u) => (pfn %llx, offset %u, len %u)",
1285                         i,
1286                         vmxferpagePacket->Ranges[i].ByteOffset,
1287                         vmxferpagePacket->Ranges[i].ByteCount,
1288                         netvscPacket->PageBuffers[0].Pfn,
1289                         netvscPacket->PageBuffers[0].Offset,
1290                         netvscPacket->PageBuffers[0].Length);
1291
1292                 /* Pass it to the upper layer */
1293                 ((NETVSC_DRIVER_OBJECT*)Device->Driver)->OnReceiveCallback(Device, netvscPacket);
1294
1295                 NetVscOnReceiveCompletion(netvscPacket->Completion.Recv.ReceiveCompletionContext);
1296         }
1297
1298         ASSERT(IsListEmpty(&listHead));
1299
1300         PutNetDevice(Device);
1301         DPRINT_EXIT(NETVSC);
1302 }
1303
1304
1305 static void
1306 NetVscSendReceiveCompletion(
1307         DEVICE_OBJECT   *Device,
1308         u64                     TransactionId
1309         )
1310 {
1311         NVSP_MESSAGE recvcompMessage;
1312         int retries=0;
1313         int ret=0;
1314
1315         DPRINT_DBG(NETVSC, "Sending receive completion pkt - %llx", TransactionId);
1316
1317         recvcompMessage.Header.MessageType = NvspMessage1TypeSendRNDISPacketComplete;
1318
1319         /* FIXME: Pass in the status */
1320         recvcompMessage.Messages.Version1Messages.SendRNDISPacketComplete.Status = NvspStatusSuccess;
1321
1322 retry_send_cmplt:
1323         /* Send the completion */
1324         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
1325                                                                                                                         &recvcompMessage,
1326                                                                                                                         sizeof(NVSP_MESSAGE),
1327                                                                                                                         TransactionId,
1328                                                                                                                         VmbusPacketTypeCompletion,
1329                                                                                                                         0);
1330         if (ret == 0) /* success */
1331         {
1332                 /* no-op */
1333         }
1334         else if (ret == -1) /* no more room...wait a bit and attempt to retry 3 times */
1335         {
1336                 retries++;
1337                 DPRINT_ERR(NETVSC, "unable to send receive completion pkt (tid %llx)...retrying %d", TransactionId, retries);
1338
1339                 if (retries < 4)
1340                 {
1341                         udelay(100);
1342                         goto retry_send_cmplt;
1343                 }
1344                 else
1345                 {
1346                         DPRINT_ERR(NETVSC, "unable to send receive completion pkt (tid %llx)...give up retrying", TransactionId);
1347                 }
1348         }
1349         else
1350         {
1351                 DPRINT_ERR(NETVSC, "unable to send receive completion pkt - %llx", TransactionId);
1352         }
1353 }
1354
1355 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
1356 static void
1357 NetVscOnReceiveCompletion(
1358         void * Context)
1359 {
1360         NETVSC_PACKET *packet = (NETVSC_PACKET*)Context;
1361         DEVICE_OBJECT *device = (DEVICE_OBJECT*)packet->Device;
1362         NETVSC_DEVICE* netDevice;
1363         u64     transactionId=0;
1364         bool fSendReceiveComp = false;
1365         unsigned long flags;
1366
1367         DPRINT_ENTER(NETVSC);
1368
1369         ASSERT(packet->XferPagePacket);
1370
1371         /* Even though it seems logical to do a GetOutboundNetDevice() here to send out receive completion, */
1372         /* we are using GetInboundNetDevice() since we may have disable outbound traffic already. */
1373         netDevice = GetInboundNetDevice(device);
1374         if (!netDevice)
1375         {
1376                 DPRINT_ERR(NETVSC, "unable to get net device...device being destroyed?");
1377                 DPRINT_EXIT(NETVSC);
1378                 return;
1379         }
1380
1381         /* Overloading use of the lock. */
1382         spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
1383
1384         ASSERT(packet->XferPagePacket->Count > 0);
1385         packet->XferPagePacket->Count--;
1386
1387         /* Last one in the line that represent 1 xfer page packet. */
1388         /* Return the xfer page packet itself to the freelist */
1389         if (packet->XferPagePacket->Count == 0)
1390         {
1391                 fSendReceiveComp = true;
1392                 transactionId = packet->Completion.Recv.ReceiveCompletionTid;
1393
1394                 INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &packet->XferPagePacket->ListEntry);
1395         }
1396
1397         /* Put the packet back */
1398         INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &packet->ListEntry);
1399         spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
1400
1401         /* Send a receive completion for the xfer page packet */
1402         if (fSendReceiveComp)
1403         {
1404                 NetVscSendReceiveCompletion(device, transactionId);
1405         }
1406
1407         PutNetDevice(device);
1408         DPRINT_EXIT(NETVSC);
1409 }
1410
1411
1412
1413 void
1414 NetVscOnChannelCallback(
1415         void * Context
1416         )
1417 {
1418         const int netPacketSize=2048;
1419         int ret=0;
1420         DEVICE_OBJECT *device=(DEVICE_OBJECT*)Context;
1421         NETVSC_DEVICE *netDevice;
1422
1423         u32 bytesRecvd;
1424         u64 requestId;
1425         unsigned char packet[netPacketSize];
1426         VMPACKET_DESCRIPTOR *desc;
1427         unsigned char   *buffer=packet;
1428         int             bufferlen=netPacketSize;
1429
1430
1431         DPRINT_ENTER(NETVSC);
1432
1433         ASSERT(device);
1434
1435         netDevice = GetInboundNetDevice(device);
1436         if (!netDevice)
1437         {
1438                 DPRINT_ERR(NETVSC, "net device (%p) shutting down...ignoring inbound packets", netDevice);
1439                 DPRINT_EXIT(NETVSC);
1440                 return;
1441         }
1442
1443         do
1444         {
1445                 ret = device->Driver->VmbusChannelInterface.RecvPacketRaw(device,
1446                                                                                                                                         buffer,
1447                                                                                                                                         bufferlen,
1448                                                                                                                                         &bytesRecvd,
1449                                                                                                                                         &requestId);
1450
1451                 if (ret == 0)
1452                 {
1453                         if (bytesRecvd > 0)
1454                         {
1455                                 DPRINT_DBG(NETVSC, "receive %d bytes, tid %llx", bytesRecvd, requestId);
1456
1457                                 desc = (VMPACKET_DESCRIPTOR*)buffer;
1458                                 switch (desc->Type)
1459                                 {
1460                                         case VmbusPacketTypeCompletion:
1461                                                 NetVscOnSendCompletion(device, desc);
1462                                                 break;
1463
1464                                         case VmbusPacketTypeDataUsingTransferPages:
1465                                                 NetVscOnReceive(device, desc);
1466                                                 break;
1467
1468                                         default:
1469                                                 DPRINT_ERR(NETVSC, "unhandled packet type %d, tid %llx len %d\n", desc->Type, requestId, bytesRecvd);
1470                                                 break;
1471                                 }
1472
1473                                 /* reset */
1474                                 if (bufferlen > netPacketSize)
1475                                 {
1476                                         kfree(buffer);
1477
1478                                         buffer = packet;
1479                                         bufferlen = netPacketSize;
1480                                 }
1481                         }
1482                         else
1483                         {
1484                                 /* DPRINT_DBG(NETVSC, "nothing else to read..."); */
1485
1486                                 /* reset */
1487                                 if (bufferlen > netPacketSize)
1488                                 {
1489                                         kfree(buffer);
1490
1491                                         buffer = packet;
1492                                         bufferlen = netPacketSize;
1493                                 }
1494
1495                                 break;
1496                         }
1497                 }
1498                 else if (ret == -2) /* Handle large packet */
1499                 {
1500                         buffer = kmalloc(bytesRecvd, GFP_ATOMIC);
1501                         if (buffer == NULL)
1502                         {
1503                                 /* Try again next time around */
1504                                 DPRINT_ERR(NETVSC, "unable to allocate buffer of size (%d)!!", bytesRecvd);
1505                                 break;
1506                         }
1507
1508                         bufferlen = bytesRecvd;
1509                 }
1510                 else
1511                 {
1512                         ASSERT(0);
1513                 }
1514         } while (1);
1515
1516         PutNetDevice(device);
1517         DPRINT_EXIT(NETVSC);
1518         return;
1519 }