/*-
* Copyright (c) 2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Author: Hartmut Brandt <harti@freebsd.org>
*/
/*
* This implements pools of DMA-able buffers that conserve DMA address space
* by putting several buffers into one page and that allow to map between
* 32-bit handles for the buffer and buffer addresses (to use 32-bit network
* interfaces on 64bit machines). This assists network interfaces that may need
* huge numbers of mbufs.
*
* $FreeBSD$
*/
#ifndef _SYS_MBPOOL_H_
#define _SYS_MBPOOL_H_
#ifdef _KERNEL
#include <sys/queue.h>
/* opaque */
struct mbpool;
/* size of reserved area at end of each chunk */
#define MBPOOL_TRAILER_SIZE 4
/* maximum value of max_pages */
#define MBPOOL_MAX_MAXPAGES ((1 << 14) - 1)
/* maximum number of chunks per page */
#define MBPOOL_MAX_CHUNKS (1 << 9)
/* initialize a pool */
int mbp_create(struct mbpool **, const char *, bus_dma_tag_t, u_int,
size_t, size_t);
/* destroy a pool */
void mbp_destroy(struct mbpool *);
/* allocate a chunk and set used and on card */
void *mbp_alloc(struct mbpool *, bus_addr_t *, uint32_t *);
/* free a chunk */
void mbp_free(struct mbpool *, void *);
/* free a chunk that is an external mbuf */
void mbp_ext_free(void *, void *);
/* free all buffers that are marked to be on the card */
void mbp_card_free(struct mbpool *);
/* count used buffers and buffers on card */
void mbp_count(struct mbpool *, u_int *, u_int *, u_int *);
/* get the buffer from a handle and clear card bit */
void *mbp_get(struct mbpool *, uint32_t);
/* get the buffer from a handle and don't clear card bit */
void *mbp_get_keep(struct mbpool *, uint32_t);
/* sync the chunk */
void mbp_sync(struct mbpool *, uint32_t, bus_addr_t, bus_size_t, u_int);
#endif /* _KERNEL */
#endif /* _SYS_MBPOOL_H_ */
