freebsd-dev/sys/i4b/layer2/i4b_mbuf.c

218 lines
4.9 KiB
C

/*-
* Copyright (c) 1997, 2002 Hellmuth Michaelis. 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.
*/
/*---------------------------------------------------------------------------
*
* i4b - mbuf handling support routines
* ------------------------------------
* last edit-date: [Sat Mar 9 17:51:22 2002]
*
*---------------------------------------------------------------------------*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <i4b/include/i4b_mbuf.h>
#define I4B_MBUF_DEBUG
#undef I4B_MBUF_TYPE_DEBUG
#ifdef I4B_MBUF_TYPE_DEBUG
#define MT_DCHAN 42
#define MT_BCHAN 43
#define MT_I4B_D MT_DCHAN
#define MT_I4B_B MT_BCHAN
#else /* ! I4B_MBUF_TYPE_DEBUG */
#define MT_I4B_D MT_DATA
#define MT_I4B_B MT_DATA
#endif /* I4B_MBUF_TYPE_DEBUG */
/*---------------------------------------------------------------------------*
* allocate D-channel mbuf space
*---------------------------------------------------------------------------*/
struct mbuf*
i4b_Dgetmbuf(int len)
{
struct mbuf *m;
if(len > MCLBYTES) /* if length > max extension size */
{
#ifdef I4B_MBUF_DEBUG
printf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
len, MCLBYTES);
#endif
return(NULL);
}
MGETHDR(m, M_DONTWAIT, MT_I4B_D); /* get mbuf with pkthdr */
/* did we actually get the mbuf ? */
if(!m)
{
#ifdef I4B_MBUF_DEBUG
printf("i4b_getbuf: error - MGETHDR failed!\n");
#endif
return(NULL);
}
if(len >= MHLEN)
{
MCLGET(m, M_DONTWAIT);
if(!(m->m_flags & M_EXT))
{
m_freem(m);
#ifdef I4B_MBUF_DEBUG
printf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
#endif
return (NULL);
}
}
m->m_len = len;
return(m);
}
/*---------------------------------------------------------------------------*
* free a D-channel mbuf
*---------------------------------------------------------------------------*/
void
i4b_Dfreembuf(struct mbuf *m)
{
if(m)
m_freem(m);
}
/*---------------------------------------------------------------------------*
* clear a D-channel ifqueue from data
*---------------------------------------------------------------------------*/
void
i4b_Dcleanifq(struct ifqueue *ifq)
{
int x = splimp();
IF_DRAIN(ifq);
splx(x);
}
/*---------------------------------------------------------------------------*
* allocate B-channel mbuf space
*---------------------------------------------------------------------------*/
struct mbuf*
i4b_Bgetmbuf(int len)
{
struct mbuf *m;
if(len > MCLBYTES) /* if length > max extension size */
{
#ifdef I4B_MBUF_DEBUG
printf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
len, MCLBYTES);
#endif
return(NULL);
}
MGETHDR(m, M_DONTWAIT, MT_I4B_B); /* get mbuf with pkthdr */
/* did we actually get the mbuf ? */
if(!m)
{
#ifdef I4B_MBUF_DEBUG
printf("i4b_getbuf: error - MGETHDR failed!\n");
#endif
return(NULL);
}
if(len >= MHLEN)
{
MCLGET(m, M_DONTWAIT);
if(!(m->m_flags & M_EXT))
{
m_freem(m);
#ifdef I4B_MBUF_DEBUG
printf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
#endif
return (NULL);
}
}
m->m_len = len;
return(m);
}
/*---------------------------------------------------------------------------*
* free a B-channel mbuf
*---------------------------------------------------------------------------*/
void
i4b_Bfreembuf(struct mbuf *m)
{
if(m)
m_freem(m);
}
/*---------------------------------------------------------------------------*
* clear a B-channel ifqueue from data
*---------------------------------------------------------------------------*/
void
i4b_Bcleanifq(struct ifqueue *ifq)
{
int x = splimp();
IF_DRAIN(ifq);
splx(x);
}
/* EOF */