3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * Author: Hartmut Brandt <harti@freebsd.org>
31 * This implements pools of DMA-able buffers that conserve DMA address space
32 * by putting several buffers into one page and that allow to map between
33 * 32-bit handles for the buffer and buffer addresses (to use 32-bit network
34 * interfaces on 64bit machines). This assists network interfaces that may need
35 * huge numbers of mbufs.
39 #ifndef _SYS_MBPOOL_H_
40 #define _SYS_MBPOOL_H_
44 #include <sys/queue.h>
49 /* size of reserved area at end of each chunk */
50 #define MBPOOL_TRAILER_SIZE 4
52 /* maximum value of max_pages */
53 #define MBPOOL_MAX_MAXPAGES ((1 << 14) - 1)
55 /* maximum number of chunks per page */
56 #define MBPOOL_MAX_CHUNKS (1 << 9)
58 /* initialize a pool */
59 int mbp_create(struct mbpool **, const char *, bus_dma_tag_t, u_int,
63 void mbp_destroy(struct mbpool *);
65 /* allocate a chunk and set used and on card */
66 void *mbp_alloc(struct mbpool *, bus_addr_t *, uint32_t *);
69 void mbp_free(struct mbpool *, void *);
71 /* free a chunk that is an external mbuf */
72 void mbp_ext_free(void *, void *);
74 /* free all buffers that are marked to be on the card */
75 void mbp_card_free(struct mbpool *);
77 /* count used buffers and buffers on card */
78 void mbp_count(struct mbpool *, u_int *, u_int *, u_int *);
80 /* get the buffer from a handle and clear card bit */
81 void *mbp_get(struct mbpool *, uint32_t);
83 /* get the buffer from a handle and don't clear card bit */
84 void *mbp_get_keep(struct mbpool *, uint32_t);
87 void mbp_sync(struct mbpool *, uint32_t, bus_addr_t, bus_size_t, u_int);
90 #endif /* _SYS_MBPOOL_H_ */