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/*
* Copyright (C) 2006 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 <stdint.h>
#include <gpxe/malloc.h>
#include <gpxe/pkbuff.h>
/** @file
*
* Packet buffers
*
*/
/**
* Allocate packet buffer
*
* @v len Required length of buffer
* @ret pkb Packet buffer, or NULL if none available
*
* The packet buffer will be physically aligned to a multiple of
* @c PKBUFF_SIZE.
*/
struct pk_buff * alloc_pkb ( size_t len ) {
struct pk_buff *pkb = NULL;
void *data;
/* Pad to minimum length */
if ( len < PKB_ZLEN )
len = PKB_ZLEN;
/* Align buffer length */
len = ( len + __alignof__( *pkb ) - 1 ) & ~( __alignof__( *pkb ) - 1 );
/* Allocate memory for buffer plus descriptor */
data = malloc_dma ( len + sizeof ( *pkb ), PKBUFF_ALIGN );
if ( ! data )
return NULL;
pkb = ( struct pk_buff * ) ( data + len );
pkb->head = pkb->data = pkb->tail = data;
pkb->end = pkb;
return pkb;
}
/**
* Free packet buffer
*
* @v pkb Packet buffer
*/
void free_pkb ( struct pk_buff *pkb ) {
if ( pkb ) {
assert ( pkb->head <= pkb->data );
assert ( pkb->data <= pkb->tail );
assert ( pkb->tail <= pkb->end );
free_dma ( pkb->head,
( pkb->end - pkb->head ) + sizeof ( *pkb ) );
}
}
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