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/** @file
Implementation of the SNP.Receive() function and its private helpers if any.
Copyright (c) 2021, Oracle and/or its affiliates.
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 "E1kNet.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
E1kNetReceive (
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
)
{
E1K_NET_DEV *Dev;
EFI_TPL OldTpl;
EFI_STATUS Status;
UINT32 RdhCur;
UINT32 RxLen;
UINTN OrigBufferSize;
EFI_PHYSICAL_ADDRESS BufferAddress;
UINT8 *RxPtr;
UINTN RxBufOffset;
DEBUG((DEBUG_INFO, "E1kNetReceive: HeaderSize=%p BufferSize=%u Buffer=%p\n",
HeaderSize, *BufferSize, Buffer));
if (This == NULL || BufferSize == NULL || Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
Dev = E1K_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;
}
E1kNetRegRead32(Dev, E1K_REG_RDH, &RdhCur);
if (Dev->RdhLastSeen == RdhCur) {
Status = EFI_NOT_READY;
goto Exit;
}
RxLen = Dev->RxRing[Dev->RdhLastSeen].BufferLength;
//
// the host must not have filled in more data than requested
//
ASSERT (RxLen <= 2048);
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;
}
BufferAddress = Dev->RxRing[Dev->RdhLastSeen].AddrBufferLow;
BufferAddress |= LShiftU64(Dev->RxRing[Dev->RdhLastSeen].AddrBufferHigh, 32);
RxBufOffset = (UINTN)(BufferAddress - Dev->RxBufDeviceBase);
RxPtr = Dev->RxBuf + RxBufOffset;
CopyMem (Buffer, RxPtr, RxLen);
if (DestAddr != NULL) {
CopyMem (DestAddr, RxPtr, sizeof (E1K_NET_MAC));
}
RxPtr += sizeof (E1K_NET_MAC);
if (SrcAddr != NULL) {
CopyMem (SrcAddr, RxPtr, sizeof (E1K_NET_MAC));
}
RxPtr += sizeof (E1K_NET_MAC);
if (Protocol != NULL) {
*Protocol = (UINT16) ((RxPtr[0] << 8) | RxPtr[1]);
}
RxPtr += sizeof (UINT16);
Status = EFI_SUCCESS;
RecycleDesc:
Dev->RdhLastSeen = (Dev->RdhLastSeen + 1) % E1K_NET_MAX_PENDING;
E1kNetRegWrite32(Dev, E1K_REG_RDT, Dev->RdhLastSeen);
Exit:
gBS->RestoreTPL (OldTpl);
return Status;
}
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