Intel Extensible Firmware Interface, Specification

Page: 316 / 494

Extensible Firmware Interface Specification
298 12/12/00 Version 1.02
15.1.12 EFI_SIMPLE_NETWO RK.Transmit()
Summary
Places a packet in the transmit queue of a network interface.
Prototype
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_TRANSMIT) (
IN EFI_SIMPLE_NETWORK *This
IN UINTN HeaderSize,
IN UINTN BufferSize,
IN VOID *Buffer,
IN EFI_MAC_ADDRESS *SrcAddr OPTIONAL ,
IN EFI_MAC_ADDRESS *DestAddr OPTIONAL ,
IN UINT16 *Protocol OPTIONAL ,
);
Parameters
This
A pointer to the
EFI_SIMPLE_NETWORK
instance.
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
.
BufferSize
The size, in bytes, of the entire packet (media header and data)
to be transmitted through the network interface.
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.
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.
DestAddr
The destination HW MAC address. If
HeaderSize
is zero,
then this parameter is ignored.
Protocol
The type of header to build. If
HeaderSize
is zero, then this
parameter is ignored. See RFC 1700, section "Ether Types", for
examples.