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Added deliver-as-iobuf/deliver-as-raw concepts.

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This commit is contained in:
Michael Brown 2007-04-27 00:02:23 +00:00
parent 2575ddc889
commit 1c765b3988
2 changed files with 91 additions and 6 deletions
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63
src/core/xfer.c
View File

@ -16,6 +16,7 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string.h>
#include <errno.h>
#include <gpxe/xfer.h>
@ -39,23 +40,75 @@ int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
}
/**
* Null deliver datagram
* 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.
*/
static int null_deliver ( struct xfer_interface *xfer __unused,
struct xfer_interface *src __unused,
struct io_buffer *iobuf ) {
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 = null_deliver,
.deliver = deliver_as_raw,
.deliver_raw = null_deliver_raw,
};
/**

34
src/include/gpxe/xfer.h
View File

@ -18,13 +18,32 @@ struct xfer_interface_operations {
/** Deliver datagram
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v src Source interface
* @v iobuf Datagram I/O buffer
* @ret rc Return status code
*
* A data transfer interface that wishes to support only raw
* data delivery should set this method to
* deliver_as_raw().
*/
int ( * deliver ) ( struct xfer_interface *xfer,
struct xfer_interface *src,
struct io_buffer *iobuf );
/** 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
*
* A data transfer interface that wishes to support only I/O
* buffer delivery should set this method to
* deliver_as_iobuf().
*/
int ( * deliver_raw ) ( struct xfer_interface *xfer,
struct xfer_interface *src,
const void *data, size_t len );
};
/** A data transfer interface */
@ -38,6 +57,19 @@ struct xfer_interface {
extern struct xfer_interface null_xfer;
extern struct xfer_interface_operations null_xfer_ops;
extern int deliver_as_raw ( struct xfer_interface *xfer,
struct xfer_interface *src,
struct io_buffer *iobuf );
extern int deliver_as_iobuf ( struct xfer_interface *xfer,
struct xfer_interface *src,
const void *data, size_t len );
/**
* Get destination data-transfer interface
*
* @v xfer Data-transfer interface
* @ret dest Destination interface
*/
static inline struct xfer_interface *
xfer_dest ( struct xfer_interface *xfer ) {
return container_of ( xfer->intf.dest, struct xfer_interface, intf );