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/*
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <errno.h>
#include <gpxe/xfer.h>
/** @file
*
* Data transfer interfaces
*
*/
/**
* Deliver datagram
*
* @v xfer Data-transfer interface
* @v iobuf Datagram I/O buffer
* @ret rc Return status code
*/
int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
struct xfer_interface *dest = xfer_dest ( xfer );
return dest->op->deliver ( dest, xfer, iobuf );
}
/**
* Null deliver datagram
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v iobuf Datagram I/O buffer
* @ret rc Return status code
*/
static int null_deliver ( struct xfer_interface *xfer __unused,
struct xfer_interface *src __unused,
struct io_buffer *iobuf ) {
free_iob ( iobuf );
return -EPIPE;
}
/** Null data transfer interface operations */
struct xfer_interface_operations null_xfer_ops = {
.deliver = null_deliver,
};
/**
* Null data transfer interface
*
* This is the interface to which data transfer interfaces are
* connected when unplugged. It will never generate messages, and
* will silently absorb all received messages.
*/
struct xfer_interface null_xfer = {
.intf = {
.dest = &null_xfer.intf,
.refcnt = null_refcnt,
},
.op = &null_xfer_ops,
};
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