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FreeBSD/Linux Kernel Cross Reference
sys/sys/mbpool.h

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    1 /*-
    2  * Copyright (c) 2003
    3  *      Fraunhofer Institute for Open Communication Systems (FhG Fokus).
    4  *      All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    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.
   14  *
   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
   25  * SUCH DAMAGE.
   26  *
   27  * Author: Hartmut Brandt <harti@freebsd.org>
   28  */
   29 
   30 /*
   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.
   36  *
   37  * $FreeBSD$
   38  */
   39 #ifndef _SYS_MBPOOL_H_
   40 #define _SYS_MBPOOL_H_
   41 
   42 #ifdef _KERNEL
   43 
   44 #include <sys/queue.h>
   45 
   46 /* opaque */
   47 struct mbpool;
   48 
   49 /* size of reserved area at end of each chunk */
   50 #define MBPOOL_TRAILER_SIZE     4
   51 
   52 /* maximum value of max_pages */
   53 #define MBPOOL_MAX_MAXPAGES     ((1 << 14) - 1)
   54 
   55 /* maximum number of chunks per page */
   56 #define MBPOOL_MAX_CHUNKS       (1 << 9)
   57 
   58 /* initialize a pool */
   59 int mbp_create(struct mbpool **, const char *, bus_dma_tag_t, u_int,
   60         size_t, size_t);
   61 
   62 /* destroy a pool */
   63 void mbp_destroy(struct mbpool *);
   64 
   65 /* allocate a chunk and set used and on card */
   66 void *mbp_alloc(struct mbpool *, bus_addr_t *, uint32_t *);
   67 
   68 /* free a chunk */
   69 void mbp_free(struct mbpool *, void *);
   70 
   71 /* free a chunk that is an external mbuf */
   72 void mbp_ext_free(void *, void *);
   73 
   74 /* free all buffers that are marked to be on the card */
   75 void mbp_card_free(struct mbpool *);
   76 
   77 /* count used buffers and buffers on card */
   78 void mbp_count(struct mbpool *, u_int *, u_int *, u_int *);
   79 
   80 /* get the buffer from a handle and clear card bit */
   81 void *mbp_get(struct mbpool *, uint32_t);
   82 
   83 /* get the buffer from a handle and don't clear card bit */
   84 void *mbp_get_keep(struct mbpool *, uint32_t);
   85 
   86 /* sync the chunk */
   87 void mbp_sync(struct mbpool *, uint32_t, bus_addr_t, bus_size_t, u_int);
   88 
   89 #endif  /* _KERNEL */
   90 #endif  /* _SYS_MBPOOL_H_ */

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