FreeBSD/Linux Kernel Cross Reference
sys/dev/cxgb/sys/mvec.h

     /**************************************************************************
      *
      * Copyright (c) 2007,2009 Kip Macy kmacy@freebsd.org
      * 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. The name of Kip Macy nor the names of other
     *    contributors may be used to endorse or promote products derived from
     *    this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
     *
     * $FreeBSD: releng/8.0/sys/dev/cxgb/sys/mvec.h 195006 2009-06-25 21:50:15Z np $
     *
     ***************************************************************************/
    
    #ifndef _MVEC_H_
    #define _MVEC_H_
    #include <machine/bus.h>
    
    #define M_DDP           0x200000        /* direct data placement mbuf */
    #define EXT_PHYS        10              /* physical/bus address  */
    
    #define m_cur_offset    m_ext.ext_size          /* override to provide ddp offset */
    #define m_seq           m_pkthdr.csum_data      /* stored sequence */
    #define m_ddp_gl        m_ext.ext_buf           /* ddp list     */
    #define m_ddp_flags     m_pkthdr.csum_flags     /* ddp flags    */
    #define m_ulp_mode      m_pkthdr.tso_segsz      /* upper level protocol */
    
    static __inline void
    busdma_map_mbuf_fast(bus_dma_tag_t tag, bus_dmamap_t map,
        struct mbuf *m, bus_dma_segment_t *seg)
    {
    #if defined(__i386__) || defined(__amd64__)
            seg->ds_addr = pmap_kextract(mtod(m, vm_offset_t));
            seg->ds_len = m->m_len;
    #else
            int nsegstmp;
    
            bus_dmamap_load_mbuf_sg(tag, map, m, seg, &nsegstmp, 0);
    #endif
    }
    
    int busdma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
        struct mbuf **m, bus_dma_segment_t *segs, int *nsegs);
    void busdma_map_sg_vec(bus_dma_tag_t tag, bus_dmamap_t map,
        struct mbuf *m, bus_dma_segment_t *segs, int *nsegs);
    static __inline int
    busdma_map_sgl(bus_dma_segment_t *vsegs, bus_dma_segment_t *segs, int count) 
    {
            while (count--) {
                    segs->ds_addr = pmap_kextract((vm_offset_t)vsegs->ds_addr);
                    segs->ds_len = vsegs->ds_len;
                    segs++;
                    vsegs++;
            }
            return (0);
    }
    
    static __inline void
    m_freem_list(struct mbuf *m)
    {
            struct mbuf *n; 
    
            while (m != NULL) {
                    n = m->m_nextpkt;
                    if (n != NULL)
                            prefetch(n);
                    m_freem(m);
                    m = n;
            }       
    }
    
    
    #endif /* _MVEC_H_ */

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