1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/** @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>
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 (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);
}
//
// 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 = Dev->VirtIo->SetQueueNotify (Dev->VirtIo, VIRTIO_NET_Q_TX);
Exit:
gBS->RestoreTPL (OldTpl);
return Status;
}
|
