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/** @file
Implementation of the SNP.Receive() function and its private helpers if any.
Copyright (C) 2013, Red Hat, Inc.
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include "VirtioNet.h"
/**
Receives a packet from a network interface.
@param This The protocol instance pointer.
@param HeaderSize The size, in bytes, of the media header received on the
network interface. If this parameter is NULL, then the
media header size will not be returned.
@param BufferSize On entry, the size, in bytes, of Buffer. On exit, the
size, in bytes, of the packet that was received on the
network interface.
@param Buffer A pointer to the data buffer to receive both the media
header and the data.
@param SrcAddr The source HW MAC address. If this parameter is NULL, the
HW MAC source address will not be extracted from the media
header.
@param DestAddr The destination HW MAC address. If this parameter is NULL,
the HW MAC destination address will not be extracted from
the media header.
@param Protocol The media header type. If this parameter is NULL, then the
protocol will not be extracted from the media header. See
RFC 1700 section "Ether Types" for examples.
@retval EFI_SUCCESS The received data was stored in Buffer, and
BufferSize has been updated to the number of
bytes received.
@retval EFI_NOT_STARTED The network interface has not been started.
@retval EFI_NOT_READY The network interface is too busy to accept
this transmit request.
@retval EFI_BUFFER_TOO_SMALL The BufferSize parameter is too small.
@retval EFI_INVALID_PARAMETER One or more of the parameters has an
unsupported value.
@retval EFI_DEVICE_ERROR The command could not be sent to the network
interface.
@retval EFI_UNSUPPORTED This function is not supported by the network
interface.
**/
EFI_STATUS
EFIAPI
VirtioNetReceive (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
OUT UINTN *HeaderSize OPTIONAL,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer,
OUT EFI_MAC_ADDRESS *SrcAddr OPTIONAL,
OUT EFI_MAC_ADDRESS *DestAddr OPTIONAL,
OUT UINT16 *Protocol OPTIONAL
)
{
VNET_DEV *Dev;
EFI_TPL OldTpl;
EFI_STATUS Status;
UINT16 RxCurUsed;
UINT16 UsedElemIdx;
UINT32 DescIdx;
UINT32 RxLen;
UINTN OrigBufferSize;
UINT8 *RxPtr;
UINT16 AvailIdx;
EFI_STATUS NotifyStatus;
if (This == NULL || BufferSize == NULL || Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
Dev = VIRTIO_NET_FROM_SNP (This);
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
switch (Dev->Snm.State) {
case EfiSimpleNetworkStopped:
Status = EFI_NOT_STARTED;
goto Exit;
case EfiSimpleNetworkStarted:
Status = EFI_DEVICE_ERROR;
goto Exit;
default:
break;
}
//
// virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device
//
MemoryFence ();
RxCurUsed = *Dev->RxRing.Used.Idx;
MemoryFence ();
if (Dev->RxLastUsed == RxCurUsed) {
Status = EFI_NOT_READY;
goto Exit;
}
UsedElemIdx = Dev->RxLastUsed % Dev->RxRing.QueueSize;
DescIdx = Dev->RxRing.Used.UsedElem[UsedElemIdx].Id;
RxLen = Dev->RxRing.Used.UsedElem[UsedElemIdx].Len;
//
// the virtio-net request header must be complete; we skip it
//
ASSERT (RxLen >= Dev->RxRing.Desc[DescIdx].Len);
RxLen -= Dev->RxRing.Desc[DescIdx].Len;
//
// the host must not have filled in more data than requested
//
ASSERT (RxLen <= Dev->RxRing.Desc[DescIdx + 1].Len);
OrigBufferSize = *BufferSize;
*BufferSize = RxLen;
if (OrigBufferSize < RxLen) {
Status = EFI_BUFFER_TOO_SMALL;
goto Exit; // keep the packet
}
if (RxLen < Dev->Snm.MediaHeaderSize) {
Status = EFI_DEVICE_ERROR;
goto RecycleDesc; // drop useless short packet
}
if (HeaderSize != NULL) {
*HeaderSize = Dev->Snm.MediaHeaderSize;
}
RxPtr = (UINT8 *)(UINTN) Dev->RxRing.Desc[DescIdx + 1].Addr;
CopyMem (Buffer, RxPtr, RxLen);
if (DestAddr != NULL) {
CopyMem (DestAddr, RxPtr, SIZE_OF_VNET (VhdrMac));
}
RxPtr += SIZE_OF_VNET (VhdrMac);
if (SrcAddr != NULL) {
CopyMem (SrcAddr, RxPtr, SIZE_OF_VNET (VhdrMac));
}
RxPtr += SIZE_OF_VNET (VhdrMac);
if (Protocol != NULL) {
*Protocol = (UINT16) ((RxPtr[0] << 8) | RxPtr[1]);
}
RxPtr += sizeof (UINT16);
Status = EFI_SUCCESS;
RecycleDesc:
++Dev->RxLastUsed;
//
// virtio-0.9.5, 2.4.1 Supplying Buffers to The Device
//
AvailIdx = *Dev->RxRing.Avail.Idx;
Dev->RxRing.Avail.Ring[AvailIdx++ % Dev->RxRing.QueueSize] =
(UINT16) DescIdx;
MemoryFence ();
*Dev->RxRing.Avail.Idx = AvailIdx;
MemoryFence ();
NotifyStatus = VIRTIO_CFG_WRITE (Dev, Generic.VhdrQueueNotify,
VIRTIO_NET_Q_RX);
if (!EFI_ERROR (Status)) { // earlier error takes precedence
Status = NotifyStatus;
}
Exit:
gBS->RestoreTPL (OldTpl);
return Status;
}
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