250 lines
5.4 KiB
C
250 lines
5.4 KiB
C
/*
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* Copyright (c) 1997, 1999 Hellmuth Michaelis. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*---------------------------------------------------------------------------
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*
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* i4b - mbuf handling support routines
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* ------------------------------------
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*
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* $Id: i4b_mbuf.c,v 1.13 1999/12/13 21:25:27 hm Exp $
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*
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* $FreeBSD$
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*
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* last edit-date: [Mon Dec 13 22:04:10 1999]
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*
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*---------------------------------------------------------------------------*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#if defined(__FreeBSD__)
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#include <sys/ioccom.h>
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#else
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#include <sys/ioctl.h>
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#endif
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#include <sys/tty.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <i4b/include/i4b_mbuf.h>
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#include <i4b/include/i4b_global.h>
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#define I4B_MBUF_DEBUG
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#undef I4B_MBUF_TYPE_DEBUG
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#ifdef I4B_MBUF_TYPE_DEBUG
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#ifdef __FreeBSD__
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#define MT_DCHAN 42
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#define MT_BCHAN 43
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#else /* NetBSD */
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#define MT_DCHAN MT_DATA
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#define MT_BCHAN MT_DATA
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#endif
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#define MT_I4B_D MT_DCHAN
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#define MT_I4B_B MT_BCHAN
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#else /* ! I4B_MBUF_TYPE_DEBUG */
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#define MT_I4B_D MT_DATA
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#define MT_I4B_B MT_DATA
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#endif /* I4B_MBUF_TYPE_DEBUG */
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/*---------------------------------------------------------------------------*
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* allocate D-channel mbuf space
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*---------------------------------------------------------------------------*/
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struct mbuf*
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i4b_Dgetmbuf(int len)
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{
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struct mbuf *m;
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if(len > MCLBYTES) /* if length > max extension size */
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{
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#ifdef I4B_MBUF_DEBUG
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printf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
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len, MCLBYTES);
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#endif
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return(NULL);
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}
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MGETHDR(m, M_DONTWAIT, MT_I4B_D); /* get mbuf with pkthdr */
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/* did we actually get the mbuf ? */
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if(!m)
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{
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#ifdef I4B_MBUF_DEBUG
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printf("i4b_getbuf: error - MGETHDR failed!\n");
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#endif
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return(NULL);
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}
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if(len >= MHLEN)
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{
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MCLGET(m, M_DONTWAIT);
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if(!(m->m_flags & M_EXT))
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{
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m_freem(m);
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#ifdef I4B_MBUF_DEBUG
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printf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
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#endif
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return (NULL);
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}
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}
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m->m_len = len;
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return(m);
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}
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/*---------------------------------------------------------------------------*
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* free a D-channel mbuf
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*---------------------------------------------------------------------------*/
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void
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i4b_Dfreembuf(struct mbuf *m)
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{
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if(m)
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m_freem(m);
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}
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/*---------------------------------------------------------------------------*
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* clear a D-channel ifqueue from data
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*---------------------------------------------------------------------------*/
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void
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i4b_Dcleanifq(struct ifqueue *ifq)
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{
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struct mbuf *m;
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int x = splimp();
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while(!IF_QEMPTY(ifq))
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{
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IF_DEQUEUE(ifq, m);
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i4b_Dfreembuf(m);
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}
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splx(x);
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}
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/*---------------------------------------------------------------------------*
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* allocate B-channel mbuf space
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*---------------------------------------------------------------------------*/
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struct mbuf*
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i4b_Bgetmbuf(int len)
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{
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struct mbuf *m;
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if(len > MCLBYTES) /* if length > max extension size */
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{
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#ifdef I4B_MBUF_DEBUG
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printf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
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len, MCLBYTES);
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#endif
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return(NULL);
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}
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MGETHDR(m, M_DONTWAIT, MT_I4B_B); /* get mbuf with pkthdr */
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/* did we actually get the mbuf ? */
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if(!m)
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{
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#ifdef I4B_MBUF_DEBUG
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printf("i4b_getbuf: error - MGETHDR failed!\n");
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#endif
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return(NULL);
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}
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if(len >= MHLEN)
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{
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MCLGET(m, M_DONTWAIT);
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if(!(m->m_flags & M_EXT))
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{
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m_freem(m);
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#ifdef I4B_MBUF_DEBUG
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printf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
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#endif
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return (NULL);
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}
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}
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m->m_len = len;
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return(m);
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}
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/*---------------------------------------------------------------------------*
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* free a B-channel mbuf
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*---------------------------------------------------------------------------*/
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void
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i4b_Bfreembuf(struct mbuf *m)
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{
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if(m)
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m_freem(m);
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}
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/*---------------------------------------------------------------------------*
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* clear a B-channel ifqueue from data
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*---------------------------------------------------------------------------*/
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void
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i4b_Bcleanifq(struct ifqueue *ifq)
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{
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struct mbuf *m;
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int x = splimp();
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while(!IF_QEMPTY(ifq))
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{
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IF_DEQUEUE(ifq, m);
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i4b_Bfreembuf(m);
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}
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splx(x);
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}
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/* EOF */
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