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linux/drivers/staging/hv/NetVsc.c

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/*
*
* 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:
* Hank Janssen <hjanssen@microsoft.com>
*
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "include/logging.h"
#include "NetVsc.h"
#include "RndisFilter.h"
/* Globals */
static const char* gDriverName="netvsc";
/* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
static const GUID gNetVscDeviceType={
.Data = {0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46, 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E}
};
/* Internal routines */
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,
VMPACKET_DESCRIPTOR *Packet
);
static int
NetVscOnSend(
struct hv_device *Device,
struct hv_netvsc_packet *Packet
);
static void
NetVscOnReceive(
struct hv_device *Device,
VMPACKET_DESCRIPTOR *Packet
);
static void
NetVscOnReceiveCompletion(
void * Context
);
static void
NetVscSendReceiveCompletion(
struct hv_device *Device,
u64 TransactionId
);
static inline 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 inline void FreeNetDevice(struct NETVSC_DEVICE *Device)
{
ASSERT(atomic_read(&Device->RefCount) == 0);
Device->Device->Extension = NULL;
kfree(Device);
}
/* Get the net device object iff exists and its refcount > 1 */
static inline struct NETVSC_DEVICE *GetOutboundNetDevice(struct hv_device *Device)
{
struct NETVSC_DEVICE *netDevice;
netDevice = (struct NETVSC_DEVICE*)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 inline struct NETVSC_DEVICE *GetInboundNetDevice(struct hv_device *Device)
{
struct NETVSC_DEVICE *netDevice;
netDevice = (struct NETVSC_DEVICE*)Device->Extension;
if (netDevice && atomic_read(&netDevice->RefCount))
atomic_inc(&netDevice->RefCount);
else
netDevice = NULL;
return netDevice;
}
static inline void PutNetDevice(struct hv_device *Device)
{
struct NETVSC_DEVICE *netDevice;
netDevice = (struct NETVSC_DEVICE*)Device->Extension;
ASSERT(netDevice);
atomic_dec(&netDevice->RefCount);
}
static inline struct NETVSC_DEVICE *ReleaseOutboundNetDevice(struct hv_device *Device)
{
struct NETVSC_DEVICE *netDevice;
netDevice = (struct NETVSC_DEVICE*)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 inline struct NETVSC_DEVICE *ReleaseInboundNetDevice(struct hv_device *Device)
{
struct NETVSC_DEVICE *netDevice;
netDevice = (struct NETVSC_DEVICE*)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;
}
/*++;
Name:
NetVscInitialize()
Description:
Main entry point
--*/
int
NetVscInitialize(
struct hv_driver *drv
)
{
NETVSC_DRIVER_OBJECT* driver = (NETVSC_DRIVER_OBJECT*)drv;
int ret=0;
DPRINT_ENTER(NETVSC);
DPRINT_DBG(NETVSC, "sizeof(struct hv_netvsc_packet)=%zd, sizeof(NVSP_MESSAGE)=%zd, sizeof(VMTRANSFER_PAGE_PACKET_HEADER)=%zd",
sizeof(struct hv_netvsc_packet), sizeof(NVSP_MESSAGE), sizeof(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(GUID));
/* Make sure it is set by the caller */
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 ret;
}
static int
NetVscInitializeReceiveBufferWithNetVsp(
struct hv_device *Device
)
{
int ret=0;
struct NETVSC_DEVICE *netDevice;
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);
ASSERT((netDevice->ReceiveBufferSize & (PAGE_SIZE-1)) == 0); /* page-size grandularity */
netDevice->ReceiveBuffer = 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;
}
ASSERT(((unsigned long)netDevice->ReceiveBuffer & (PAGE_SIZE-1)) == 0); /* page-aligned buffer */
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;
}
/* WaitEventWait(ext->ChannelInitEvent); */
/* Notify the NetVsp of the gpadl handle */
DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendReceiveBuffer...");
initPacket = &netDevice->ChannelInitPacket;
memset(initPacket, 0, sizeof(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(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;
}
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(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(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;
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->SendBufferSize > 0);
ASSERT((netDevice->SendBufferSize & (PAGE_SIZE-1)) == 0); /* page-size grandularity */
netDevice->SendBuffer = 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;
}
ASSERT(((unsigned long)netDevice->SendBuffer & (PAGE_SIZE-1)) == 0); /* page-aligned buffer */
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;
}
/* WaitEventWait(ext->ChannelInitEvent); */
/* Notify the NetVsp of the gpadl handle */
DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendSendBuffer...");
initPacket = &netDevice->ChannelInitPacket;
memset(initPacket, 0, sizeof(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(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;
}
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
)
{
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(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(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 */
PageFree(NetDevice->ReceiveBuffer, NetDevice->ReceiveBufferSize >> PAGE_SHIFT);
NetDevice->ReceiveBuffer = NULL;
}
if (NetDevice->ReceiveSections)
{
kfree(NetDevice->ReceiveSections);
NetDevice->ReceiveSections = NULL;
NetDevice->ReceiveSectionCount = 0;
}
DPRINT_EXIT(NETVSC);
return ret;
}
static int
NetVscDestroySendBuffer(
struct NETVSC_DEVICE *NetDevice
)
{
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(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(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 */
PageFree(NetDevice->SendBuffer, NetDevice->SendBufferSize >> PAGE_SHIFT);
NetDevice->SendBuffer = NULL;
}
DPRINT_EXIT(NETVSC);
return ret;
}
static int
NetVscConnectToVsp(
struct hv_device *Device
)
{
int ret=0;
struct NETVSC_DEVICE *netDevice;
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(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(NVSP_MESSAGE),
(unsigned long)initPacket,
VmbusPacketTypeDataInBand,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if( ret != 0)
{
DPRINT_ERR(NETVSC, "unable to send NvspMessageTypeInit");
goto Cleanup;
}
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(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(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
*/
/* 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);
}
/*++
Name:
NetVscOnDeviceAdd()
Description:
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;
LIST_ENTRY *entry;
NETVSC_DRIVER_OBJECT *netDriver = (NETVSC_DRIVER_OBJECT*) 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;
INITIALIZE_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(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;
}
INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &packet->ListEntry);
}
netDevice->ChannelInitEvent = WaitEventCreate();
/* 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);
while (!IsListEmpty(&netDevice->ReceivePacketList))
{
entry = REMOVE_HEAD_LIST(&netDevice->ReceivePacketList);
packet = CONTAINING_RECORD(entry, struct hv_netvsc_packet, ListEntry);
kfree(packet);
}
ReleaseOutboundNetDevice(Device);
ReleaseInboundNetDevice(Device);
FreeNetDevice(netDevice);
}
DPRINT_EXIT(NETVSC);
return ret;
}
/*++
Name:
NetVscOnDeviceRemove()
Description:
Callback when the root bus device is removed
--*/
static int
NetVscOnDeviceRemove(
struct hv_device *Device
)
{
struct NETVSC_DEVICE *netDevice;
struct hv_netvsc_packet *netvscPacket;
int ret=0;
LIST_ENTRY *entry;
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 */
while (!IsListEmpty(&netDevice->ReceivePacketList))
{
entry = REMOVE_HEAD_LIST(&netDevice->ReceivePacketList);
netvscPacket = CONTAINING_RECORD(entry, struct hv_netvsc_packet, ListEntry);
kfree(netvscPacket);
}
kfree(netDevice->ChannelInitEvent);
FreeNetDevice(netDevice);
DPRINT_EXIT(NETVSC);
return ret;
}
/*++
Name:
NetVscOnCleanup()
Description:
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,
VMPACKET_DESCRIPTOR *Packet
)
{
struct NETVSC_DEVICE *netDevice;
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 = (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(NVSP_MESSAGE));
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;
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)
sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 0;/* 0 is RMC_DATA; */
else
sendMessage.Messages.Version1Messages.SendRNDISPacket.ChannelType = 1;/* 1 is RMC_CONTROL; */
/* 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(NVSP_MESSAGE),
(unsigned long)Packet);
}
else
{
ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
&sendMessage,
sizeof(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,
VMPACKET_DESCRIPTOR *Packet
)
{
struct NETVSC_DEVICE *netDevice;
VMTRANSFER_PAGE_PACKET_HEADER *vmxferpagePacket;
NVSP_MESSAGE *nvspPacket;
struct hv_netvsc_packet *netvscPacket=NULL;
LIST_ENTRY* entry;
unsigned long start;
unsigned long end, endVirtual;
/* NETVSC_DRIVER_OBJECT *netvscDriver; */
XFERPAGE_PACKET *xferpagePacket=NULL;
LIST_ENTRY listHead;
int i=0, j=0;
int count=0, bytesRemain=0;
unsigned long flags;
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 = (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 = (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);
INITIALIZE_LIST_HEAD(&listHead);
/*
* 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 (!IsListEmpty(&netDevice->ReceivePacketList))
{
entry = REMOVE_HEAD_LIST(&netDevice->ReceivePacketList);
netvscPacket = CONTAINING_RECORD(entry, struct hv_netvsc_packet, ListEntry);
INSERT_TAIL_LIST(&listHead, &netvscPacket->ListEntry);
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--)
{
entry = REMOVE_HEAD_LIST(&listHead);
netvscPacket = CONTAINING_RECORD(entry, struct hv_netvsc_packet, ListEntry);
INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &netvscPacket->ListEntry);
}
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 */
entry = REMOVE_HEAD_LIST(&listHead);
xferpagePacket = CONTAINING_RECORD(entry, XFERPAGE_PACKET, ListEntry);
xferpagePacket->Count = count - 1; /* This is how much we can satisfy */
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++)
{
entry = REMOVE_HEAD_LIST(&listHead);
netvscPacket = CONTAINING_RECORD(entry, struct hv_netvsc_packet, ListEntry);
/* Initialize the netvsc packet */
netvscPacket->XferPagePacket = xferpagePacket;
netvscPacket->Completion.Recv.OnReceiveCompletion = NetVscOnReceiveCompletion;
netvscPacket->Completion.Recv.ReceiveCompletionContext = netvscPacket;
netvscPacket->Device = Device;
netvscPacket->Completion.Recv.ReceiveCompletionTid = vmxferpagePacket->d.TransactionId; /* Save this so that we can send it back */
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 */
((NETVSC_DRIVER_OBJECT*)Device->Driver)->OnReceiveCallback(Device, netvscPacket);
NetVscOnReceiveCompletion(netvscPacket->Completion.Recv.ReceiveCompletionContext);
}
ASSERT(IsListEmpty(&listHead));
PutNetDevice(Device);
DPRINT_EXIT(NETVSC);
}
static void
NetVscSendReceiveCompletion(
struct hv_device *Device,
u64 TransactionId
)
{
NVSP_MESSAGE recvcompMessage;
int retries=0;
int ret=0;
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(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 = (struct hv_netvsc_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;
INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &packet->XferPagePacket->ListEntry);
}
/* Put the packet back */
INSERT_TAIL_LIST(&netDevice->ReceivePacketList, &packet->ListEntry);
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);
}
void
NetVscOnChannelCallback(
void * Context
)
{
const int netPacketSize=2048;
int ret=0;
struct hv_device *device=(struct hv_device*)Context;
struct NETVSC_DEVICE *netDevice;
u32 bytesRecvd;
u64 requestId;
unsigned char packet[netPacketSize];
VMPACKET_DESCRIPTOR *desc;
unsigned char *buffer=packet;
int bufferlen=netPacketSize;
DPRINT_ENTER(NETVSC);
ASSERT(device);
netDevice = GetInboundNetDevice(device);
if (!netDevice)
{
DPRINT_ERR(NETVSC, "net device (%p) shutting down...ignoring inbound packets", netDevice);
DPRINT_EXIT(NETVSC);
return;
}
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 = (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 > netPacketSize)
{
kfree(buffer);
buffer = packet;
bufferlen = netPacketSize;
}
}
else
{
/* DPRINT_DBG(NETVSC, "nothing else to read..."); */
/* reset */
if (bufferlen > netPacketSize)
{
kfree(buffer);
buffer = packet;
bufferlen = netPacketSize;
}
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;
}
else
{
ASSERT(0);
}
} while (1);
PutNetDevice(device);
DPRINT_EXIT(NETVSC);
return;
}
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