]> git.karo-electronics.de Git - mv-sheeva.git/blobdiff - drivers/staging/hv/netvsc.c
Staging: hv: rename NetVsc.c and .h to netvsc.c and .h
[mv-sheeva.git] / drivers / staging / hv / netvsc.c
diff --git a/drivers/staging/hv/netvsc.c b/drivers/staging/hv/netvsc.c
new file mode 100644 (file)
index 0000000..1000989
--- /dev/null
@@ -0,0 +1,1393 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include "osd.h"
+#include "logging.h"
+#include "netvsc.h"
+#include "RndisFilter.h"
+
+
+/* Globals */
+static const char *gDriverName = "netvsc";
+
+/* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
+static const struct hv_guid gNetVscDeviceType = {
+       .data = {
+               0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
+               0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
+       }
+};
+
+static int NetVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo);
+
+static int NetVscOnDeviceRemove(struct hv_device *Device);
+
+static void NetVscOnCleanup(struct hv_driver *Driver);
+
+static void NetVscOnChannelCallback(void *context);
+
+static int NetVscInitializeSendBufferWithNetVsp(struct hv_device *Device);
+
+static int NetVscInitializeReceiveBufferWithNetVsp(struct hv_device *Device);
+
+static int NetVscDestroySendBuffer(struct netvsc_device *NetDevice);
+
+static int NetVscDestroyReceiveBuffer(struct netvsc_device *NetDevice);
+
+static int NetVscConnectToVsp(struct hv_device *Device);
+
+static void NetVscOnSendCompletion(struct hv_device *Device,
+                                  struct vmpacket_descriptor *Packet);
+
+static int NetVscOnSend(struct hv_device *Device,
+                       struct hv_netvsc_packet *Packet);
+
+static void NetVscOnReceive(struct hv_device *Device,
+                           struct vmpacket_descriptor *Packet);
+
+static void NetVscOnReceiveCompletion(void *Context);
+
+static void NetVscSendReceiveCompletion(struct hv_device *Device,
+                                       u64 TransactionId);
+
+
+static struct netvsc_device *AllocNetDevice(struct hv_device *Device)
+{
+       struct netvsc_device *netDevice;
+
+       netDevice = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
+       if (!netDevice)
+               return NULL;
+
+       /* Set to 2 to allow both inbound and outbound traffic */
+       atomic_cmpxchg(&netDevice->RefCount, 0, 2);
+
+       netDevice->Device = Device;
+       Device->Extension = netDevice;
+
+       return netDevice;
+}
+
+static void FreeNetDevice(struct netvsc_device *Device)
+{
+       WARN_ON(atomic_read(&Device->RefCount) == 0);
+       Device->Device->Extension = NULL;
+       kfree(Device);
+}
+
+
+/* Get the net device object iff exists and its refcount > 1 */
+static struct netvsc_device *GetOutboundNetDevice(struct hv_device *Device)
+{
+       struct netvsc_device *netDevice;
+
+       netDevice = Device->Extension;
+       if (netDevice && atomic_read(&netDevice->RefCount) > 1)
+               atomic_inc(&netDevice->RefCount);
+       else
+               netDevice = NULL;
+
+       return netDevice;
+}
+
+/* Get the net device object iff exists and its refcount > 0 */
+static struct netvsc_device *GetInboundNetDevice(struct hv_device *Device)
+{
+       struct netvsc_device *netDevice;
+
+       netDevice = Device->Extension;
+       if (netDevice && atomic_read(&netDevice->RefCount))
+               atomic_inc(&netDevice->RefCount);
+       else
+               netDevice = NULL;
+
+       return netDevice;
+}
+
+static void PutNetDevice(struct hv_device *Device)
+{
+       struct netvsc_device *netDevice;
+
+       netDevice = Device->Extension;
+       /* ASSERT(netDevice); */
+
+       atomic_dec(&netDevice->RefCount);
+}
+
+static struct netvsc_device *ReleaseOutboundNetDevice(struct hv_device *Device)
+{
+       struct netvsc_device *netDevice;
+
+       netDevice = Device->Extension;
+       if (netDevice == NULL)
+               return NULL;
+
+       /* Busy wait until the ref drop to 2, then set it to 1 */
+       while (atomic_cmpxchg(&netDevice->RefCount, 2, 1) != 2)
+               udelay(100);
+
+       return netDevice;
+}
+
+static struct netvsc_device *ReleaseInboundNetDevice(struct hv_device *Device)
+{
+       struct netvsc_device *netDevice;
+
+       netDevice = Device->Extension;
+       if (netDevice == NULL)
+               return NULL;
+
+       /* Busy wait until the ref drop to 1, then set it to 0 */
+       while (atomic_cmpxchg(&netDevice->RefCount, 1, 0) != 1)
+               udelay(100);
+
+       Device->Extension = NULL;
+       return netDevice;
+}
+
+/*
+ * NetVscInitialize - Main entry point
+ */
+int NetVscInitialize(struct hv_driver *drv)
+{
+       struct netvsc_driver *driver = (struct netvsc_driver *)drv;
+
+       DPRINT_ENTER(NETVSC);
+
+       DPRINT_DBG(NETVSC, "sizeof(struct hv_netvsc_packet)=%zd, "
+                  "sizeof(struct nvsp_message)=%zd, "
+                  "sizeof(struct vmtransfer_page_packet_header)=%zd",
+                  sizeof(struct hv_netvsc_packet),
+                  sizeof(struct nvsp_message),
+                  sizeof(struct vmtransfer_page_packet_header));
+
+       /* Make sure we are at least 2 pages since 1 page is used for control */
+       /* ASSERT(driver->RingBufferSize >= (PAGE_SIZE << 1)); */
+
+       drv->name = gDriverName;
+       memcpy(&drv->deviceType, &gNetVscDeviceType, sizeof(struct hv_guid));
+
+       /* Make sure it is set by the caller */
+       /* FIXME: These probably should still be tested in some way */
+       /* ASSERT(driver->OnReceiveCallback); */
+       /* ASSERT(driver->OnLinkStatusChanged); */
+
+       /* Setup the dispatch table */
+       driver->Base.OnDeviceAdd        = NetVscOnDeviceAdd;
+       driver->Base.OnDeviceRemove     = NetVscOnDeviceRemove;
+       driver->Base.OnCleanup          = NetVscOnCleanup;
+
+       driver->OnSend                  = NetVscOnSend;
+
+       RndisFilterInit(driver);
+
+       DPRINT_EXIT(NETVSC);
+
+       return 0;
+}
+
+static int NetVscInitializeReceiveBufferWithNetVsp(struct hv_device *Device)
+{
+       int ret = 0;
+       struct netvsc_device *netDevice;
+       struct nvsp_message *initPacket;
+
+       DPRINT_ENTER(NETVSC);
+
+       netDevice = GetOutboundNetDevice(Device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "unable to get net device..."
+                          "device being destroyed?");
+               DPRINT_EXIT(NETVSC);
+               return -1;
+       }
+       /* ASSERT(netDevice->ReceiveBufferSize > 0); */
+       /* page-size grandularity */
+       /* ASSERT((netDevice->ReceiveBufferSize & (PAGE_SIZE - 1)) == 0); */
+
+       netDevice->ReceiveBuffer =
+               osd_PageAlloc(netDevice->ReceiveBufferSize >> PAGE_SHIFT);
+       if (!netDevice->ReceiveBuffer) {
+               DPRINT_ERR(NETVSC,
+                          "unable to allocate receive buffer of size %d",
+                          netDevice->ReceiveBufferSize);
+               ret = -1;
+               goto Cleanup;
+       }
+       /* page-aligned buffer */
+       /* ASSERT(((unsigned long)netDevice->ReceiveBuffer & (PAGE_SIZE - 1)) == */
+       /*      0); */
+
+       DPRINT_INFO(NETVSC, "Establishing receive buffer's GPADL...");
+
+       /*
+        * Establish the gpadl handle for this buffer on this
+        * channel.  Note: This call uses the vmbus connection rather
+        * than the channel to establish the gpadl handle.
+        */
+       ret = Device->Driver->VmbusChannelInterface.EstablishGpadl(Device,
+                                       netDevice->ReceiveBuffer,
+                                       netDevice->ReceiveBufferSize,
+                                       &netDevice->ReceiveBufferGpadlHandle);
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC,
+                          "unable to establish receive buffer's gpadl");
+               goto Cleanup;
+       }
+
+       /* osd_WaitEventWait(ext->ChannelInitEvent); */
+
+       /* Notify the NetVsp of the gpadl handle */
+       DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendReceiveBuffer...");
+
+       initPacket = &netDevice->ChannelInitPacket;
+
+       memset(initPacket, 0, sizeof(struct nvsp_message));
+
+       initPacket->Header.MessageType = NvspMessage1TypeSendReceiveBuffer;
+       initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->ReceiveBufferGpadlHandle;
+       initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
+
+       /* Send the gpadl notification request */
+       ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
+                               initPacket,
+                               sizeof(struct nvsp_message),
+                               (unsigned long)initPacket,
+                               VmbusPacketTypeDataInBand,
+                               VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC,
+                          "unable to send receive buffer's gpadl to netvsp");
+               goto Cleanup;
+       }
+
+       osd_WaitEventWait(netDevice->ChannelInitEvent);
+
+       /* Check the response */
+       if (initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status != NvspStatusSuccess) {
+               DPRINT_ERR(NETVSC, "Unable to complete receive buffer "
+                          "initialzation with NetVsp - status %d",
+                          initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Status);
+               ret = -1;
+               goto Cleanup;
+       }
+
+       /* Parse the response */
+       /* ASSERT(netDevice->ReceiveSectionCount == 0); */
+       /* ASSERT(netDevice->ReceiveSections == NULL); */
+
+       netDevice->ReceiveSectionCount = initPacket->Messages.Version1Messages.SendReceiveBufferComplete.NumSections;
+
+       netDevice->ReceiveSections = kmalloc(netDevice->ReceiveSectionCount * sizeof(struct nvsp_1_receive_buffer_section), GFP_KERNEL);
+       if (netDevice->ReceiveSections == NULL) {
+               ret = -1;
+               goto Cleanup;
+       }
+
+       memcpy(netDevice->ReceiveSections,
+               initPacket->Messages.Version1Messages.SendReceiveBufferComplete.Sections,
+               netDevice->ReceiveSectionCount * sizeof(struct nvsp_1_receive_buffer_section));
+
+       DPRINT_INFO(NETVSC, "Receive sections info (count %d, offset %d, "
+                   "endoffset %d, suballoc size %d, num suballocs %d)",
+                   netDevice->ReceiveSectionCount,
+                   netDevice->ReceiveSections[0].Offset,
+                   netDevice->ReceiveSections[0].EndOffset,
+                   netDevice->ReceiveSections[0].SubAllocationSize,
+                   netDevice->ReceiveSections[0].NumSubAllocations);
+
+       /*
+        * For 1st release, there should only be 1 section that represents the
+        * entire receive buffer
+        */
+       if (netDevice->ReceiveSectionCount != 1 ||
+           netDevice->ReceiveSections->Offset != 0) {
+               ret = -1;
+               goto Cleanup;
+       }
+
+       goto Exit;
+
+Cleanup:
+       NetVscDestroyReceiveBuffer(netDevice);
+
+Exit:
+       PutNetDevice(Device);
+       DPRINT_EXIT(NETVSC);
+       return ret;
+}
+
+static int NetVscInitializeSendBufferWithNetVsp(struct hv_device *Device)
+{
+       int ret = 0;
+       struct netvsc_device *netDevice;
+       struct nvsp_message *initPacket;
+
+       DPRINT_ENTER(NETVSC);
+
+       netDevice = GetOutboundNetDevice(Device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "unable to get net device..."
+                          "device being destroyed?");
+               DPRINT_EXIT(NETVSC);
+               return -1;
+       }
+       if (netDevice->SendBufferSize <= 0) {
+               ret = -EINVAL;
+               goto Cleanup;
+       }
+
+       /* page-size grandularity */
+       /* ASSERT((netDevice->SendBufferSize & (PAGE_SIZE - 1)) == 0); */
+
+       netDevice->SendBuffer =
+               osd_PageAlloc(netDevice->SendBufferSize >> PAGE_SHIFT);
+       if (!netDevice->SendBuffer) {
+               DPRINT_ERR(NETVSC, "unable to allocate send buffer of size %d",
+                          netDevice->SendBufferSize);
+               ret = -1;
+               goto Cleanup;
+       }
+       /* page-aligned buffer */
+       /* ASSERT(((unsigned long)netDevice->SendBuffer & (PAGE_SIZE - 1)) == 0); */
+
+       DPRINT_INFO(NETVSC, "Establishing send buffer's GPADL...");
+
+       /*
+        * Establish the gpadl handle for this buffer on this
+        * channel.  Note: This call uses the vmbus connection rather
+        * than the channel to establish the gpadl handle.
+        */
+       ret = Device->Driver->VmbusChannelInterface.EstablishGpadl(Device,
+                                       netDevice->SendBuffer,
+                                       netDevice->SendBufferSize,
+                                       &netDevice->SendBufferGpadlHandle);
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC, "unable to establish send buffer's gpadl");
+               goto Cleanup;
+       }
+
+       /* osd_WaitEventWait(ext->ChannelInitEvent); */
+
+       /* Notify the NetVsp of the gpadl handle */
+       DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendSendBuffer...");
+
+       initPacket = &netDevice->ChannelInitPacket;
+
+       memset(initPacket, 0, sizeof(struct nvsp_message));
+
+       initPacket->Header.MessageType = NvspMessage1TypeSendSendBuffer;
+       initPacket->Messages.Version1Messages.SendReceiveBuffer.GpadlHandle = netDevice->SendBufferGpadlHandle;
+       initPacket->Messages.Version1Messages.SendReceiveBuffer.Id = NETVSC_SEND_BUFFER_ID;
+
+       /* Send the gpadl notification request */
+       ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
+                               initPacket, sizeof(struct nvsp_message),
+                               (unsigned long)initPacket,
+                               VmbusPacketTypeDataInBand,
+                               VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC,
+                          "unable to send receive buffer's gpadl to netvsp");
+               goto Cleanup;
+       }
+
+       osd_WaitEventWait(netDevice->ChannelInitEvent);
+
+       /* Check the response */
+       if (initPacket->Messages.Version1Messages.SendSendBufferComplete.Status != NvspStatusSuccess) {
+               DPRINT_ERR(NETVSC, "Unable to complete send buffer "
+                          "initialzation with NetVsp - status %d",
+                          initPacket->Messages.Version1Messages.SendSendBufferComplete.Status);
+               ret = -1;
+               goto Cleanup;
+       }
+
+       netDevice->SendSectionSize = initPacket->Messages.Version1Messages.SendSendBufferComplete.SectionSize;
+
+       goto Exit;
+
+Cleanup:
+       NetVscDestroySendBuffer(netDevice);
+
+Exit:
+       PutNetDevice(Device);
+       DPRINT_EXIT(NETVSC);
+       return ret;
+}
+
+static int NetVscDestroyReceiveBuffer(struct netvsc_device *NetDevice)
+{
+       struct nvsp_message *revokePacket;
+       int ret = 0;
+
+       DPRINT_ENTER(NETVSC);
+
+       /*
+        * If we got a section count, it means we received a
+        * SendReceiveBufferComplete msg (ie sent
+        * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
+        * to send a revoke msg here
+        */
+       if (NetDevice->ReceiveSectionCount) {
+               DPRINT_INFO(NETVSC,
+                           "Sending NvspMessage1TypeRevokeReceiveBuffer...");
+
+               /* Send the revoke receive buffer */
+               revokePacket = &NetDevice->RevokePacket;
+               memset(revokePacket, 0, sizeof(struct nvsp_message));
+
+               revokePacket->Header.MessageType = NvspMessage1TypeRevokeReceiveBuffer;
+               revokePacket->Messages.Version1Messages.RevokeReceiveBuffer.Id = NETVSC_RECEIVE_BUFFER_ID;
+
+               ret = NetDevice->Device->Driver->VmbusChannelInterface.SendPacket(
+                                               NetDevice->Device,
+                                               revokePacket,
+                                               sizeof(struct nvsp_message),
+                                               (unsigned long)revokePacket,
+                                               VmbusPacketTypeDataInBand, 0);
+               /*
+                * If we failed here, we might as well return and
+                * have a leak rather than continue and a bugchk
+                */
+               if (ret != 0) {
+                       DPRINT_ERR(NETVSC, "unable to send revoke receive "
+                                  "buffer to netvsp");
+                       DPRINT_EXIT(NETVSC);
+                       return -1;
+               }
+       }
+
+       /* Teardown the gpadl on the vsp end */
+       if (NetDevice->ReceiveBufferGpadlHandle) {
+               DPRINT_INFO(NETVSC, "Tearing down receive buffer's GPADL...");
+
+               ret = NetDevice->Device->Driver->VmbusChannelInterface.TeardownGpadl(
+                                       NetDevice->Device,
+                                       NetDevice->ReceiveBufferGpadlHandle);
+
+               /* If we failed here, we might as well return and have a leak rather than continue and a bugchk */
+               if (ret != 0) {
+                       DPRINT_ERR(NETVSC,
+                                  "unable to teardown receive buffer's gpadl");
+                       DPRINT_EXIT(NETVSC);
+                       return -1;
+               }
+               NetDevice->ReceiveBufferGpadlHandle = 0;
+       }
+
+       if (NetDevice->ReceiveBuffer) {
+               DPRINT_INFO(NETVSC, "Freeing up receive buffer...");
+
+               /* Free up the receive buffer */
+               osd_PageFree(NetDevice->ReceiveBuffer,
+                            NetDevice->ReceiveBufferSize >> PAGE_SHIFT);
+               NetDevice->ReceiveBuffer = NULL;
+       }
+
+       if (NetDevice->ReceiveSections) {
+               NetDevice->ReceiveSectionCount = 0;
+               kfree(NetDevice->ReceiveSections);
+               NetDevice->ReceiveSections = NULL;
+       }
+
+       DPRINT_EXIT(NETVSC);
+
+       return ret;
+}
+
+static int NetVscDestroySendBuffer(struct netvsc_device *NetDevice)
+{
+       struct nvsp_message *revokePacket;
+       int ret = 0;
+
+       DPRINT_ENTER(NETVSC);
+
+       /*
+        * If we got a section count, it means we received a
+        *  SendReceiveBufferComplete msg (ie sent
+        *  NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
+        *  to send a revoke msg here
+        */
+       if (NetDevice->SendSectionSize) {
+               DPRINT_INFO(NETVSC,
+                           "Sending NvspMessage1TypeRevokeSendBuffer...");
+
+               /* Send the revoke send buffer */
+               revokePacket = &NetDevice->RevokePacket;
+               memset(revokePacket, 0, sizeof(struct nvsp_message));
+
+               revokePacket->Header.MessageType = NvspMessage1TypeRevokeSendBuffer;
+               revokePacket->Messages.Version1Messages.RevokeSendBuffer.Id = NETVSC_SEND_BUFFER_ID;
+
+               ret = NetDevice->Device->Driver->VmbusChannelInterface.SendPacket(NetDevice->Device,
+                                       revokePacket,
+                                       sizeof(struct nvsp_message),
+                                       (unsigned long)revokePacket,
+                                       VmbusPacketTypeDataInBand, 0);
+               /*
+                * If we failed here, we might as well return and have a leak
+                * rather than continue and a bugchk
+                */
+               if (ret != 0) {
+                       DPRINT_ERR(NETVSC, "unable to send revoke send buffer "
+                                  "to netvsp");
+                       DPRINT_EXIT(NETVSC);
+                       return -1;
+               }
+       }
+
+       /* Teardown the gpadl on the vsp end */
+       if (NetDevice->SendBufferGpadlHandle) {
+               DPRINT_INFO(NETVSC, "Tearing down send buffer's GPADL...");
+
+               ret = NetDevice->Device->Driver->VmbusChannelInterface.TeardownGpadl(NetDevice->Device, NetDevice->SendBufferGpadlHandle);
+
+               /*
+                * If we failed here, we might as well return and have a leak
+                * rather than continue and a bugchk
+                */
+               if (ret != 0) {
+                       DPRINT_ERR(NETVSC, "unable to teardown send buffer's "
+                                  "gpadl");
+                       DPRINT_EXIT(NETVSC);
+                       return -1;
+               }
+               NetDevice->SendBufferGpadlHandle = 0;
+       }
+
+       if (NetDevice->SendBuffer) {
+               DPRINT_INFO(NETVSC, "Freeing up send buffer...");
+
+               /* Free up the receive buffer */
+               osd_PageFree(NetDevice->SendBuffer,
+                            NetDevice->SendBufferSize >> PAGE_SHIFT);
+               NetDevice->SendBuffer = NULL;
+       }
+
+       DPRINT_EXIT(NETVSC);
+
+       return ret;
+}
+
+
+static int NetVscConnectToVsp(struct hv_device *Device)
+{
+       int ret;
+       struct netvsc_device *netDevice;
+       struct nvsp_message *initPacket;
+       int ndisVersion;
+
+       DPRINT_ENTER(NETVSC);
+
+       netDevice = GetOutboundNetDevice(Device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "unable to get net device..."
+                          "device being destroyed?");
+               DPRINT_EXIT(NETVSC);
+               return -1;
+       }
+
+       initPacket = &netDevice->ChannelInitPacket;
+
+       memset(initPacket, 0, sizeof(struct nvsp_message));
+       initPacket->Header.MessageType = NvspMessageTypeInit;
+       initPacket->Messages.InitMessages.Init.MinProtocolVersion = NVSP_MIN_PROTOCOL_VERSION;
+       initPacket->Messages.InitMessages.Init.MaxProtocolVersion = NVSP_MAX_PROTOCOL_VERSION;
+
+       DPRINT_INFO(NETVSC, "Sending NvspMessageTypeInit...");
+
+       /* Send the init request */
+       ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
+                               initPacket,
+                               sizeof(struct nvsp_message),
+                               (unsigned long)initPacket,
+                               VmbusPacketTypeDataInBand,
+                               VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC, "unable to send NvspMessageTypeInit");
+               goto Cleanup;
+       }
+
+       osd_WaitEventWait(netDevice->ChannelInitEvent);
+
+       /* Now, check the response */
+       /* ASSERT(initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength <= MAX_MULTIPAGE_BUFFER_COUNT); */
+       DPRINT_INFO(NETVSC, "NvspMessageTypeInit status(%d) max mdl chain (%d)",
+               initPacket->Messages.InitMessages.InitComplete.Status,
+               initPacket->Messages.InitMessages.InitComplete.MaximumMdlChainLength);
+
+       if (initPacket->Messages.InitMessages.InitComplete.Status !=
+           NvspStatusSuccess) {
+               DPRINT_ERR(NETVSC,
+                       "unable to initialize with netvsp (status 0x%x)",
+                       initPacket->Messages.InitMessages.InitComplete.Status);
+               ret = -1;
+               goto Cleanup;
+       }
+
+       if (initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion != NVSP_PROTOCOL_VERSION_1) {
+               DPRINT_ERR(NETVSC, "unable to initialize with netvsp "
+                          "(version expected 1 got %d)",
+                          initPacket->Messages.InitMessages.InitComplete.NegotiatedProtocolVersion);
+               ret = -1;
+               goto Cleanup;
+       }
+       DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendNdisVersion...");
+
+       /* Send the ndis version */
+       memset(initPacket, 0, sizeof(struct nvsp_message));
+
+       ndisVersion = 0x00050000;
+
+       initPacket->Header.MessageType = NvspMessage1TypeSendNdisVersion;
+       initPacket->Messages.Version1Messages.SendNdisVersion.NdisMajorVersion =
+                               (ndisVersion & 0xFFFF0000) >> 16;
+       initPacket->Messages.Version1Messages.SendNdisVersion.NdisMinorVersion =
+                               ndisVersion & 0xFFFF;
+
+       /* Send the init request */
+       ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
+                                       initPacket,
+                                       sizeof(struct nvsp_message),
+                                       (unsigned long)initPacket,
+                                       VmbusPacketTypeDataInBand, 0);
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC,
+                          "unable to send NvspMessage1TypeSendNdisVersion");
+               ret = -1;
+               goto Cleanup;
+       }
+       /*
+        * BUGBUG - We have to wait for the above msg since the
+        * netvsp uses KMCL which acknowledges packet (completion
+        * packet) since our Vmbus always set the
+        * VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED flag
+        */
+        /* osd_WaitEventWait(NetVscChannel->ChannelInitEvent); */
+
+       /* Post the big receive buffer to NetVSP */
+       ret = NetVscInitializeReceiveBufferWithNetVsp(Device);
+       if (ret == 0)
+               ret = NetVscInitializeSendBufferWithNetVsp(Device);
+
+Cleanup:
+       PutNetDevice(Device);
+       DPRINT_EXIT(NETVSC);
+       return ret;
+}
+
+static void NetVscDisconnectFromVsp(struct netvsc_device *NetDevice)
+{
+       DPRINT_ENTER(NETVSC);
+
+       NetVscDestroyReceiveBuffer(NetDevice);
+       NetVscDestroySendBuffer(NetDevice);
+
+       DPRINT_EXIT(NETVSC);
+}
+
+/*
+ * NetVscOnDeviceAdd - Callback when the device belonging to this driver is added
+ */
+static int NetVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo)
+{
+       int ret = 0;
+       int i;
+       struct netvsc_device *netDevice;
+       struct hv_netvsc_packet *packet, *pos;
+       struct netvsc_driver *netDriver =
+                               (struct netvsc_driver *)Device->Driver;
+
+       DPRINT_ENTER(NETVSC);
+
+       netDevice = AllocNetDevice(Device);
+       if (!netDevice) {
+               ret = -1;
+               goto Cleanup;
+       }
+
+       DPRINT_DBG(NETVSC, "netvsc channel object allocated - %p", netDevice);
+
+       /* Initialize the NetVSC channel extension */
+       netDevice->ReceiveBufferSize = NETVSC_RECEIVE_BUFFER_SIZE;
+       spin_lock_init(&netDevice->receive_packet_list_lock);
+
+       netDevice->SendBufferSize = NETVSC_SEND_BUFFER_SIZE;
+
+       INIT_LIST_HEAD(&netDevice->ReceivePacketList);
+
+       for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
+               packet = kzalloc(sizeof(struct hv_netvsc_packet) +
+                                (NETVSC_RECEIVE_SG_COUNT *
+                                 sizeof(struct hv_page_buffer)), GFP_KERNEL);
+               if (!packet) {
+                       DPRINT_DBG(NETVSC, "unable to allocate netvsc pkts "
+                                  "for receive pool (wanted %d got %d)",
+                                  NETVSC_RECEIVE_PACKETLIST_COUNT, i);
+                       break;
+               }
+               list_add_tail(&packet->ListEntry,
+                             &netDevice->ReceivePacketList);
+       }
+       netDevice->ChannelInitEvent = osd_WaitEventCreate();
+       if (!netDevice->ChannelInitEvent) {
+               ret = -ENOMEM;
+               goto Cleanup;
+       }
+
+       /* Open the channel */
+       ret = Device->Driver->VmbusChannelInterface.Open(Device,
+                                               netDriver->RingBufferSize,
+                                               netDriver->RingBufferSize,
+                                               NULL, 0,
+                                               NetVscOnChannelCallback,
+                                               Device);
+
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC, "unable to open channel: %d", ret);
+               ret = -1;
+               goto Cleanup;
+       }
+
+       /* Channel is opened */
+       DPRINT_INFO(NETVSC, "*** NetVSC channel opened successfully! ***");
+
+       /* Connect with the NetVsp */
+       ret = NetVscConnectToVsp(Device);
+       if (ret != 0) {
+               DPRINT_ERR(NETVSC, "unable to connect to NetVSP - %d", ret);
+               ret = -1;
+               goto Close;
+       }
+
+       DPRINT_INFO(NETVSC, "*** NetVSC channel handshake result - %d ***",
+                   ret);
+
+       DPRINT_EXIT(NETVSC);
+       return ret;
+
+Close:
+       /* Now, we can close the channel safely */
+       Device->Driver->VmbusChannelInterface.Close(Device);
+
+Cleanup:
+
+       if (netDevice) {
+               kfree(netDevice->ChannelInitEvent);
+
+               list_for_each_entry_safe(packet, pos,
+                                        &netDevice->ReceivePacketList,
+                                        ListEntry) {
+                       list_del(&packet->ListEntry);
+                       kfree(packet);
+               }
+
+               ReleaseOutboundNetDevice(Device);
+               ReleaseInboundNetDevice(Device);
+
+               FreeNetDevice(netDevice);
+       }
+
+       DPRINT_EXIT(NETVSC);
+       return ret;
+}
+
+/*
+ * NetVscOnDeviceRemove - Callback when the root bus device is removed
+ */
+static int NetVscOnDeviceRemove(struct hv_device *Device)
+{
+       struct netvsc_device *netDevice;
+       struct hv_netvsc_packet *netvscPacket, *pos;
+
+       DPRINT_ENTER(NETVSC);
+
+       DPRINT_INFO(NETVSC, "Disabling outbound traffic on net device (%p)...",
+                   Device->Extension);
+
+       /* Stop outbound traffic ie sends and receives completions */
+       netDevice = ReleaseOutboundNetDevice(Device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "No net device present!!");
+               return -1;
+       }
+
+       /* Wait for all send completions */
+       while (atomic_read(&netDevice->NumOutstandingSends)) {
+               DPRINT_INFO(NETVSC, "waiting for %d requests to complete...",
+                           atomic_read(&netDevice->NumOutstandingSends));
+               udelay(100);
+       }
+
+       DPRINT_INFO(NETVSC, "Disconnecting from netvsp...");
+
+       NetVscDisconnectFromVsp(netDevice);
+
+       DPRINT_INFO(NETVSC, "Disabling inbound traffic on net device (%p)...",
+                   Device->Extension);
+
+       /* Stop inbound traffic ie receives and sends completions */
+       netDevice = ReleaseInboundNetDevice(Device);
+
+       /* At this point, no one should be accessing netDevice except in here */
+       DPRINT_INFO(NETVSC, "net device (%p) safe to remove", netDevice);
+
+       /* Now, we can close the channel safely */
+       Device->Driver->VmbusChannelInterface.Close(Device);
+
+       /* Release all resources */
+       list_for_each_entry_safe(netvscPacket, pos,
+                                &netDevice->ReceivePacketList, ListEntry) {
+               list_del(&netvscPacket->ListEntry);
+               kfree(netvscPacket);
+       }
+
+       kfree(netDevice->ChannelInitEvent);
+       FreeNetDevice(netDevice);
+
+       DPRINT_EXIT(NETVSC);
+       return 0;
+}
+
+/*
+ * NetVscOnCleanup - Perform any cleanup when the driver is removed
+ */
+static void NetVscOnCleanup(struct hv_driver *drv)
+{
+       DPRINT_ENTER(NETVSC);
+       DPRINT_EXIT(NETVSC);
+}
+
+static void NetVscOnSendCompletion(struct hv_device *Device,
+                                  struct vmpacket_descriptor *Packet)
+{
+       struct netvsc_device *netDevice;
+       struct nvsp_message *nvspPacket;
+       struct hv_netvsc_packet *nvscPacket;
+
+       DPRINT_ENTER(NETVSC);
+
+       netDevice = GetInboundNetDevice(Device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "unable to get net device..."
+                          "device being destroyed?");
+               DPRINT_EXIT(NETVSC);
+               return;
+       }
+
+       nvspPacket = (struct nvsp_message *)((unsigned long)Packet + (Packet->DataOffset8 << 3));
+
+       DPRINT_DBG(NETVSC, "send completion packet - type %d",
+                  nvspPacket->Header.MessageType);
+
+       if ((nvspPacket->Header.MessageType == NvspMessageTypeInitComplete) ||
+           (nvspPacket->Header.MessageType ==
+            NvspMessage1TypeSendReceiveBufferComplete) ||
+           (nvspPacket->Header.MessageType ==
+            NvspMessage1TypeSendSendBufferComplete)) {
+               /* Copy the response back */
+               memcpy(&netDevice->ChannelInitPacket, nvspPacket,
+                      sizeof(struct nvsp_message));
+               osd_WaitEventSet(netDevice->ChannelInitEvent);
+       } else if (nvspPacket->Header.MessageType ==
+                  NvspMessage1TypeSendRNDISPacketComplete) {
+               /* Get the send context */
+               nvscPacket = (struct hv_netvsc_packet *)(unsigned long)Packet->TransactionId;
+               /* ASSERT(nvscPacket); */
+
+               /* Notify the layer above us */
+               nvscPacket->Completion.Send.OnSendCompletion(nvscPacket->Completion.Send.SendCompletionContext);
+
+               atomic_dec(&netDevice->NumOutstandingSends);
+       } else {
+               DPRINT_ERR(NETVSC, "Unknown send completion packet type - "
+                          "%d received!!", nvspPacket->Header.MessageType);
+       }
+
+       PutNetDevice(Device);
+       DPRINT_EXIT(NETVSC);
+}
+
+static int NetVscOnSend(struct hv_device *Device,
+                       struct hv_netvsc_packet *Packet)
+{
+       struct netvsc_device *netDevice;
+       int ret = 0;
+
+       struct nvsp_message sendMessage;
+
+       DPRINT_ENTER(NETVSC);
+
+       netDevice = GetOutboundNetDevice(Device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
+                          "ignoring outbound packets", netDevice);
+               DPRINT_EXIT(NETVSC);
+               return -2;
+       }
+
+       sendMessage.Header.MessageType = NvspMessage1TypeSendRNDISPacket;
+       if (Packet->IsDataPacket) {
+               /* 0 is RMC_DATA; */
+               sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 0;
+       } else {
+               /* 1 is RMC_CONTROL; */
+               sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 1;
+       }
+
+       /* Not using send buffer section */
+       sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionIndex = 0xFFFFFFFF;
+       sendMessage.Messages.Version1Messages.SendRNDISPacket.SendBufferSectionSize = 0;
+
+       if (Packet->PageBufferCount) {
+               ret = Device->Driver->VmbusChannelInterface.SendPacketPageBuffer(
+                                       Device, Packet->PageBuffers,
+                                       Packet->PageBufferCount,
+                                       &sendMessage,
+                                       sizeof(struct nvsp_message),
+                                       (unsigned long)Packet);
+       } else {
+               ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
+                               &sendMessage,
+                               sizeof(struct nvsp_message),
+                               (unsigned long)Packet,
+                               VmbusPacketTypeDataInBand,
+                               VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+       }
+
+       if (ret != 0)
+               DPRINT_ERR(NETVSC, "Unable to send packet %p ret %d",
+                          Packet, ret);
+
+       atomic_inc(&netDevice->NumOutstandingSends);
+       PutNetDevice(Device);
+
+       DPRINT_EXIT(NETVSC);
+       return ret;
+}
+
+static void NetVscOnReceive(struct hv_device *Device,
+                           struct vmpacket_descriptor *Packet)
+{
+       struct netvsc_device *netDevice;
+       struct vmtransfer_page_packet_header *vmxferpagePacket;
+       struct nvsp_message *nvspPacket;
+       struct hv_netvsc_packet *netvscPacket = NULL;
+       unsigned long start;
+       unsigned long end, endVirtual;
+       /* struct netvsc_driver *netvscDriver; */
+       struct xferpage_packet *xferpagePacket = NULL;
+       int i, j;
+       int count = 0, bytesRemain = 0;
+       unsigned long flags;
+       LIST_HEAD(listHead);
+
+       DPRINT_ENTER(NETVSC);
+
+       netDevice = GetInboundNetDevice(Device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "unable to get net device..."
+                          "device being destroyed?");
+               DPRINT_EXIT(NETVSC);
+               return;
+       }
+
+       /*
+        * All inbound packets other than send completion should be xfer page
+        * packet
+        */
+       if (Packet->Type != VmbusPacketTypeDataUsingTransferPages) {
+               DPRINT_ERR(NETVSC, "Unknown packet type received - %d",
+                          Packet->Type);
+               PutNetDevice(Device);
+               return;
+       }
+
+       nvspPacket = (struct nvsp_message *)((unsigned long)Packet +
+                       (Packet->DataOffset8 << 3));
+
+       /* Make sure this is a valid nvsp packet */
+       if (nvspPacket->Header.MessageType != NvspMessage1TypeSendRNDISPacket) {
+               DPRINT_ERR(NETVSC, "Unknown nvsp packet type received - %d",
+                          nvspPacket->Header.MessageType);
+               PutNetDevice(Device);
+               return;
+       }
+
+       DPRINT_DBG(NETVSC, "NVSP packet received - type %d",
+                  nvspPacket->Header.MessageType);
+
+       vmxferpagePacket = (struct vmtransfer_page_packet_header *)Packet;
+
+       if (vmxferpagePacket->TransferPageSetId != NETVSC_RECEIVE_BUFFER_ID) {
+               DPRINT_ERR(NETVSC, "Invalid xfer page set id - "
+                          "expecting %x got %x", NETVSC_RECEIVE_BUFFER_ID,
+                          vmxferpagePacket->TransferPageSetId);
+               PutNetDevice(Device);
+               return;
+       }
+
+       DPRINT_DBG(NETVSC, "xfer page - range count %d",
+                  vmxferpagePacket->RangeCount);
+
+       /*
+        * Grab free packets (range count + 1) to represent this xfer
+        * page packet. +1 to represent the xfer page packet itself.
+        * We grab it here so that we know exactly how many we can
+        * fulfil
+        */
+       spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
+       while (!list_empty(&netDevice->ReceivePacketList)) {
+               list_move_tail(netDevice->ReceivePacketList.next, &listHead);
+               if (++count == vmxferpagePacket->RangeCount + 1)
+                       break;
+       }
+       spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
+
+       /*
+        * We need at least 2 netvsc pkts (1 to represent the xfer
+        * page and at least 1 for the range) i.e. we can handled
+        * some of the xfer page packet ranges...
+        */
+       if (count < 2) {
+               DPRINT_ERR(NETVSC, "Got only %d netvsc pkt...needed %d pkts. "
+                          "Dropping this xfer page packet completely!",
+                          count, vmxferpagePacket->RangeCount + 1);
+
+               /* Return it to the freelist */
+               spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
+               for (i = count; i != 0; i--) {
+                       list_move_tail(listHead.next,
+                                      &netDevice->ReceivePacketList);
+               }
+               spin_unlock_irqrestore(&netDevice->receive_packet_list_lock,
+                                      flags);
+
+               NetVscSendReceiveCompletion(Device,
+                                           vmxferpagePacket->d.TransactionId);
+
+               PutNetDevice(Device);
+               return;
+       }
+
+       /* Remove the 1st packet to represent the xfer page packet itself */
+       xferpagePacket = (struct xferpage_packet *)listHead.next;
+       list_del(&xferpagePacket->ListEntry);
+
+       /* This is how much we can satisfy */
+       xferpagePacket->Count = count - 1;
+       /* ASSERT(xferpagePacket->Count > 0 && xferpagePacket->Count <= */
+       /*      vmxferpagePacket->RangeCount); */
+
+       if (xferpagePacket->Count != vmxferpagePacket->RangeCount) {
+               DPRINT_INFO(NETVSC, "Needed %d netvsc pkts to satisy this xfer "
+                           "page...got %d", vmxferpagePacket->RangeCount,
+                           xferpagePacket->Count);
+       }
+
+       /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
+       for (i = 0; i < (count - 1); i++) {
+               netvscPacket = (struct hv_netvsc_packet *)listHead.next;
+               list_del(&netvscPacket->ListEntry);
+
+               /* Initialize the netvsc packet */
+               netvscPacket->XferPagePacket = xferpagePacket;
+               netvscPacket->Completion.Recv.OnReceiveCompletion =
+                                       NetVscOnReceiveCompletion;
+               netvscPacket->Completion.Recv.ReceiveCompletionContext =
+                                       netvscPacket;
+               netvscPacket->Device = Device;
+               /* Save this so that we can send it back */
+               netvscPacket->Completion.Recv.ReceiveCompletionTid =
+                                       vmxferpagePacket->d.TransactionId;
+
+               netvscPacket->TotalDataBufferLength =
+                                       vmxferpagePacket->Ranges[i].ByteCount;
+               netvscPacket->PageBufferCount = 1;
+
+               /* ASSERT(vmxferpagePacket->Ranges[i].ByteOffset + */
+               /*      vmxferpagePacket->Ranges[i].ByteCount < */
+               /*      netDevice->ReceiveBufferSize); */
+
+               netvscPacket->PageBuffers[0].Length =
+                                       vmxferpagePacket->Ranges[i].ByteCount;
+
+               start = virt_to_phys((void *)((unsigned long)netDevice->ReceiveBuffer + vmxferpagePacket->Ranges[i].ByteOffset));
+
+               netvscPacket->PageBuffers[0].Pfn = start >> PAGE_SHIFT;
+               endVirtual = (unsigned long)netDevice->ReceiveBuffer
+                   + vmxferpagePacket->Ranges[i].ByteOffset
+                   + vmxferpagePacket->Ranges[i].ByteCount - 1;
+               end = virt_to_phys((void *)endVirtual);
+
+               /* Calculate the page relative offset */
+               netvscPacket->PageBuffers[0].Offset =
+                       vmxferpagePacket->Ranges[i].ByteOffset & (PAGE_SIZE - 1);
+               if ((end >> PAGE_SHIFT) != (start >> PAGE_SHIFT)) {
+                       /* Handle frame across multiple pages: */
+                       netvscPacket->PageBuffers[0].Length =
+                               (netvscPacket->PageBuffers[0].Pfn << PAGE_SHIFT)
+                               + PAGE_SIZE - start;
+                       bytesRemain = netvscPacket->TotalDataBufferLength -
+                                       netvscPacket->PageBuffers[0].Length;
+                       for (j = 1; j < NETVSC_PACKET_MAXPAGE; j++) {
+                               netvscPacket->PageBuffers[j].Offset = 0;
+                               if (bytesRemain <= PAGE_SIZE) {
+                                       netvscPacket->PageBuffers[j].Length = bytesRemain;
+                                       bytesRemain = 0;
+                               } else {
+                                       netvscPacket->PageBuffers[j].Length = PAGE_SIZE;
+                                       bytesRemain -= PAGE_SIZE;
+                               }
+                               netvscPacket->PageBuffers[j].Pfn =
+                                   virt_to_phys((void *)(endVirtual - bytesRemain)) >> PAGE_SHIFT;
+                               netvscPacket->PageBufferCount++;
+                               if (bytesRemain == 0)
+                                       break;
+                       }
+                       /* ASSERT(bytesRemain == 0); */
+               }
+               DPRINT_DBG(NETVSC, "[%d] - (abs offset %u len %u) => "
+                          "(pfn %llx, offset %u, len %u)", i,
+                          vmxferpagePacket->Ranges[i].ByteOffset,
+                          vmxferpagePacket->Ranges[i].ByteCount,
+                          netvscPacket->PageBuffers[0].Pfn,
+                          netvscPacket->PageBuffers[0].Offset,
+                          netvscPacket->PageBuffers[0].Length);
+
+               /* Pass it to the upper layer */
+               ((struct netvsc_driver *)Device->Driver)->OnReceiveCallback(Device, netvscPacket);
+
+               NetVscOnReceiveCompletion(netvscPacket->Completion.Recv.ReceiveCompletionContext);
+       }
+
+       /* ASSERT(list_empty(&listHead)); */
+
+       PutNetDevice(Device);
+       DPRINT_EXIT(NETVSC);
+}
+
+static void NetVscSendReceiveCompletion(struct hv_device *Device,
+                                       u64 TransactionId)
+{
+       struct nvsp_message recvcompMessage;
+       int retries = 0;
+       int ret;
+
+       DPRINT_DBG(NETVSC, "Sending receive completion pkt - %llx",
+                  TransactionId);
+
+       recvcompMessage.Header.MessageType =
+                               NvspMessage1TypeSendRNDISPacketComplete;
+
+       /* FIXME: Pass in the status */
+       recvcompMessage.Messages.Version1Messages.SendRNDISPacketComplete.Status = NvspStatusSuccess;
+
+retry_send_cmplt:
+       /* Send the completion */
+       ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
+                                       &recvcompMessage,
+                                       sizeof(struct nvsp_message),
+                                       TransactionId,
+                                       VmbusPacketTypeCompletion, 0);
+       if (ret == 0) {
+               /* success */
+               /* no-op */
+       } else if (ret == -1) {
+               /* no more room...wait a bit and attempt to retry 3 times */
+               retries++;
+               DPRINT_ERR(NETVSC, "unable to send receive completion pkt "
+                          "(tid %llx)...retrying %d", TransactionId, retries);
+
+               if (retries < 4) {
+                       udelay(100);
+                       goto retry_send_cmplt;
+               } else {
+                       DPRINT_ERR(NETVSC, "unable to send receive completion "
+                                 "pkt (tid %llx)...give up retrying",
+                                 TransactionId);
+               }
+       } else {
+               DPRINT_ERR(NETVSC, "unable to send receive completion pkt - "
+                          "%llx", TransactionId);
+       }
+}
+
+/* Send a receive completion packet to RNDIS device (ie NetVsp) */
+static void NetVscOnReceiveCompletion(void *Context)
+{
+       struct hv_netvsc_packet *packet = Context;
+       struct hv_device *device = (struct hv_device *)packet->Device;
+       struct netvsc_device *netDevice;
+       u64 transactionId = 0;
+       bool fSendReceiveComp = false;
+       unsigned long flags;
+
+       DPRINT_ENTER(NETVSC);
+
+       /* ASSERT(packet->XferPagePacket); */
+
+       /*
+        * Even though it seems logical to do a GetOutboundNetDevice() here to
+        * send out receive completion, we are using GetInboundNetDevice()
+        * since we may have disable outbound traffic already.
+        */
+       netDevice = GetInboundNetDevice(device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "unable to get net device..."
+                          "device being destroyed?");
+               DPRINT_EXIT(NETVSC);
+               return;
+       }
+
+       /* Overloading use of the lock. */
+       spin_lock_irqsave(&netDevice->receive_packet_list_lock, flags);
+
+       /* ASSERT(packet->XferPagePacket->Count > 0); */
+       packet->XferPagePacket->Count--;
+
+       /*
+        * Last one in the line that represent 1 xfer page packet.
+        * Return the xfer page packet itself to the freelist
+        */
+       if (packet->XferPagePacket->Count == 0) {
+               fSendReceiveComp = true;
+               transactionId = packet->Completion.Recv.ReceiveCompletionTid;
+               list_add_tail(&packet->XferPagePacket->ListEntry,
+                             &netDevice->ReceivePacketList);
+
+       }
+
+       /* Put the packet back */
+       list_add_tail(&packet->ListEntry, &netDevice->ReceivePacketList);
+       spin_unlock_irqrestore(&netDevice->receive_packet_list_lock, flags);
+
+       /* Send a receive completion for the xfer page packet */
+       if (fSendReceiveComp)
+               NetVscSendReceiveCompletion(device, transactionId);
+
+       PutNetDevice(device);
+       DPRINT_EXIT(NETVSC);
+}
+
+static void NetVscOnChannelCallback(void *Context)
+{
+       int ret;
+       struct hv_device *device = Context;
+       struct netvsc_device *netDevice;
+       u32 bytesRecvd;
+       u64 requestId;
+       unsigned char *packet;
+       struct vmpacket_descriptor *desc;
+       unsigned char *buffer;
+       int bufferlen = NETVSC_PACKET_SIZE;
+
+
+       DPRINT_ENTER(NETVSC);
+
+       /* ASSERT(device); */
+
+       packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
+                        GFP_KERNEL);
+       if (!packet)
+               return;
+       buffer = packet;
+
+       netDevice = GetInboundNetDevice(device);
+       if (!netDevice) {
+               DPRINT_ERR(NETVSC, "net device (%p) shutting down..."
+                          "ignoring inbound packets", netDevice);
+               DPRINT_EXIT(NETVSC);
+               goto out;
+       }
+
+       do {
+               ret = device->Driver->VmbusChannelInterface.RecvPacketRaw(
+                                               device, buffer, bufferlen,
+                                               &bytesRecvd, &requestId);
+               if (ret == 0) {
+                       if (bytesRecvd > 0) {
+                               DPRINT_DBG(NETVSC, "receive %d bytes, tid %llx",
+                                          bytesRecvd, requestId);
+
+                               desc = (struct vmpacket_descriptor *)buffer;
+                               switch (desc->Type) {
+                               case VmbusPacketTypeCompletion:
+                                       NetVscOnSendCompletion(device, desc);
+                                       break;
+
+                               case VmbusPacketTypeDataUsingTransferPages:
+                                       NetVscOnReceive(device, desc);
+                                       break;
+
+                               default:
+                                       DPRINT_ERR(NETVSC,
+                                                  "unhandled packet type %d, "
+                                                  "tid %llx len %d\n",
+                                                  desc->Type, requestId,
+                                                  bytesRecvd);
+                                       break;
+                               }
+
+                               /* reset */
+                               if (bufferlen > NETVSC_PACKET_SIZE) {
+                                       kfree(buffer);
+                                       buffer = packet;
+                                       bufferlen = NETVSC_PACKET_SIZE;
+                               }
+                       } else {
+                               /* reset */
+                               if (bufferlen > NETVSC_PACKET_SIZE) {
+                                       kfree(buffer);
+                                       buffer = packet;
+                                       bufferlen = NETVSC_PACKET_SIZE;
+                               }
+
+                               break;
+                       }
+               } else if (ret == -2) {
+                       /* Handle large packet */
+                       buffer = kmalloc(bytesRecvd, GFP_ATOMIC);
+                       if (buffer == NULL) {
+                               /* Try again next time around */
+                               DPRINT_ERR(NETVSC,
+                                          "unable to allocate buffer of size "
+                                          "(%d)!!", bytesRecvd);
+                               break;
+                       }
+
+                       bufferlen = bytesRecvd;
+               }
+       } while (1);
+
+       PutNetDevice(device);
+       DPRINT_EXIT(NETVSC);
+out:
+       kfree(buffer);
+       return;
+}