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/** @file
Implementation of the SNP.Transmit() function and its private helpers if any.
Copyright (C) 2013, Red Hat, Inc.
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include "VirtioNet.h"
/**
Places a packet in the transmit queue of a network interface.
@param This The protocol instance pointer.
@param HeaderSize The size, in bytes, of the media header to be filled in by
the Transmit() function. If HeaderSize is non-zero, then
it must be equal to This->Mode->MediaHeaderSize and the
DestAddr and Protocol parameters must not be NULL.
@param BufferSize The size, in bytes, of the entire packet (media header and
data) to be transmitted through the network interface.
@param Buffer A pointer to the packet (media header followed by data) to
be transmitted. This parameter cannot be NULL. If
HeaderSize is zero, then the media header in Buffer must
already be filled in by the caller. If HeaderSize is
non-zero, then the media header will be filled in by the
Transmit() function.
@param SrcAddr The source HW MAC address. If HeaderSize is zero, then
this parameter is ignored. If HeaderSize is non-zero and
SrcAddr is NULL, then This->Mode->CurrentAddress is used
for the source HW MAC address.
@param DestAddr The destination HW MAC address. If HeaderSize is zero,
then this parameter is ignored.
@param Protocol The type of header to build. If HeaderSize is zero, then
this parameter is ignored. See RFC 1700, section "Ether
Types", for examples.
@retval EFI_SUCCESS The packet was placed on the transmit queue.
@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
VirtioNetTransmit (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN UINTN HeaderSize,
IN UINTN BufferSize,
IN /* +OUT! */ VOID *Buffer,
IN EFI_MAC_ADDRESS *SrcAddr OPTIONAL,
IN EFI_MAC_ADDRESS *DestAddr OPTIONAL,
IN UINT16 *Protocol OPTIONAL
)
{
VNET_DEV *Dev;
EFI_TPL OldTpl;
EFI_STATUS Status;
UINT16 DescIdx;
UINT16 AvailIdx;
EFI_PHYSICAL_ADDRESS DeviceAddress;
if (This == NULL || BufferSize == 0 || 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;
}
if (BufferSize < Dev->Snm.MediaHeaderSize) {
Status = EFI_BUFFER_TOO_SMALL;
goto Exit;
}
if (BufferSize > Dev->Snm.MediaHeaderSize + Dev->Snm.MaxPacketSize) {
Status = EFI_INVALID_PARAMETER;
goto Exit;
}
//
// check if we have room for transmission
//
ASSERT (Dev->TxCurPending <= Dev->TxMaxPending);
if (Dev->TxCurPending == Dev->TxMaxPending) {
Status = EFI_NOT_READY;
goto Exit;
}
//
// the caller may want us to fill in the media header:
// dst MAC, src MAC, Ethertype
//
if (HeaderSize != 0) {
UINT8 *Ptr;
if (HeaderSize != Dev->Snm.MediaHeaderSize ||
DestAddr == NULL || Protocol == NULL) {
Status = EFI_INVALID_PARAMETER;
goto Exit;
}
Ptr = Buffer;
ASSERT (SIZE_OF_VNET (Mac) <= sizeof (EFI_MAC_ADDRESS));
CopyMem (Ptr, DestAddr, SIZE_OF_VNET (Mac));
Ptr += SIZE_OF_VNET (Mac);
CopyMem (Ptr,
(SrcAddr == NULL) ? &Dev->Snm.CurrentAddress : SrcAddr,
SIZE_OF_VNET (Mac));
Ptr += SIZE_OF_VNET (Mac);
*Ptr++ = (UINT8) (*Protocol >> 8);
*Ptr++ = (UINT8) *Protocol;
ASSERT ((UINTN) (Ptr - (UINT8 *) Buffer) == Dev->Snm.MediaHeaderSize);
}
//
// Map the transmit buffer system physical address to device address.
//
Status = VirtioNetMapTxBuf (
Dev,
Buffer,
BufferSize,
&DeviceAddress
);
if (EFI_ERROR (Status)) {
Status = EFI_DEVICE_ERROR;
goto Exit;
}
//
// virtio-0.9.5, 2.4.1 Supplying Buffers to The Device
//
DescIdx = Dev->TxFreeStack[Dev->TxCurPending++];
Dev->TxRing.Desc[DescIdx + 1].Addr = DeviceAddress;
Dev->TxRing.Desc[DescIdx + 1].Len = (UINT32) BufferSize;
//
// the available index is never written by the host, we can read it back
// without a barrier
//
AvailIdx = *Dev->TxRing.Avail.Idx;
Dev->TxRing.Avail.Ring[AvailIdx++ % Dev->TxRing.QueueSize] = DescIdx;
MemoryFence ();
*Dev->TxRing.Avail.Idx = AvailIdx;
MemoryFence ();
Status = Dev->VirtIo->SetQueueNotify (Dev->VirtIo, VIRTIO_NET_Q_TX);
Exit:
gBS->RestoreTPL (OldTpl);
return Status;
}
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