diff options
Diffstat (limited to 'OvmfPkg/VirtioNetDxe/SnpReceive.c')
| -rw-r--r-- | OvmfPkg/VirtioNetDxe/SnpReceive.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioNetDxe/SnpReceive.c b/OvmfPkg/VirtioNetDxe/SnpReceive.c new file mode 100644 index 000000000..87c6ca9b4 --- /dev/null +++ b/OvmfPkg/VirtioNetDxe/SnpReceive.c @@ -0,0 +1,190 @@ +/** @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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