/*
* 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 <string.h>
#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 );
}
/**
* Deliver datagram as raw data
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v iobuf Datagram I/O buffer
* @ret rc Return status code
*
* This function is intended to be used as the deliver() method for
* data transfer interfaces that prefer to handle raw data.
*/
int deliver_as_raw ( struct xfer_interface *xfer,
struct xfer_interface *src,
struct io_buffer *iobuf ) {
int rc;
rc = xfer->op->deliver_raw ( xfer, src, iobuf->data,
iob_len ( iobuf ) );
free_iob ( iobuf );
return rc;
}
/**
* Deliver datagram as I/O buffer
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*
* This function is intended to be used as the deliver_raw() method
* for data transfer interfaces that prefer to handle I/O buffers.
*/
int deliver_as_iobuf ( struct xfer_interface *xfer,
struct xfer_interface *src,
const void *data, size_t len ) {
struct io_buffer *iobuf;
#warning "Do we need interface-specific I/O buffer allocation?"
iobuf = alloc_iob ( len );
if ( ! iobuf )
return -ENOMEM;
memcpy ( iob_put ( iobuf, len ), data, len );
return xfer->op->deliver ( xfer, src, iobuf );
}
/**
* Null deliver datagram as raw data
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
static int null_deliver_raw ( struct xfer_interface *xfer,
struct xfer_interface *src,
const void *data __unused, size_t len ) {
DBGC ( src, "XFER %p->%p %zd bytes delivered %s\n", src, xfer, len,
( ( xfer == &null_xfer ) ?
"before connection" : "after termination" ) );
return -EPIPE;
}
/** Null data transfer interface operations */
struct xfer_interface_operations null_xfer_ops = {
.deliver = deliver_as_raw,
.deliver_raw = null_deliver_raw,
};
/**
* 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,
};
