diff options
Diffstat (limited to 'OvmfPkg/VirtioNetDxe/SnpTransmit.c')
| -rw-r--r-- | OvmfPkg/VirtioNetDxe/SnpTransmit.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioNetDxe/SnpTransmit.c b/OvmfPkg/VirtioNetDxe/SnpTransmit.c new file mode 100644 index 0000000000..5bfb807edc --- /dev/null +++ b/OvmfPkg/VirtioNetDxe/SnpTransmit.c @@ -0,0 +1,169 @@ +/** @file
+
+ Implementation of the SNP.Transmit() function and its private helpers if any.
+
+ Copyright (C) 2013, Red Hat, Inc.
+ Copyright (c) 2006 - 2010, 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"
+
+/**
+ 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;
+
+ 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 (VhdrMac) <= sizeof (EFI_MAC_ADDRESS));
+
+ CopyMem (Ptr, DestAddr, SIZE_OF_VNET (VhdrMac));
+ Ptr += SIZE_OF_VNET (VhdrMac);
+
+ CopyMem (Ptr,
+ (SrcAddr == NULL) ? &Dev->Snm.CurrentAddress : SrcAddr,
+ SIZE_OF_VNET (VhdrMac));
+ Ptr += SIZE_OF_VNET (VhdrMac);
+
+ *Ptr++ = (UINT8) (*Protocol >> 8);
+ *Ptr++ = (UINT8) *Protocol;
+
+ ASSERT (Ptr - (UINT8 *) Buffer == Dev->Snm.MediaHeaderSize);
+ }
+
+ //
+ // virtio-0.9.5, 2.4.1 Supplying Buffers to The Device
+ //
+ DescIdx = Dev->TxFreeStack[Dev->TxCurPending++];
+ Dev->TxRing.Desc[DescIdx + 1].Addr = (UINTN) Buffer;
+ 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 = VIRTIO_CFG_WRITE (Dev, Generic.VhdrQueueNotify, VIRTIO_NET_Q_TX);
+
+Exit:
+ gBS->RestoreTPL (OldTpl);
+ return Status;
+}
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