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Add a new, better mechanism for sticking packets onto ifqueues.

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The old system had the misfeature that the only policy it could implement
was tail-drop; the new IF_ENQ_DROP macro/function makes it possible
to implement more sophisticated queueing policies on a system-wide
basis.  No code actually uses this yet (although on my machine
I have converted the ethernet and (polled) loopback to use it).
This commit is contained in:
Garrett Wollman 1996-07-22 20:06:01 +00:00
parent c6a977a04d
commit 6f86639187
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=17247
1 changed files with 30 additions and 1 deletions
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31
sys/net/if.h
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)if.h 8.1 (Berkeley) 6/10/93
* $Id: if.h,v 1.28 1996/02/06 18:51:10 wollman Exp $
* $Id: if.h,v 1.29 1996/06/10 23:07:28 gpalmer Exp $
*/
#ifndef _NET_IF_H_
@ -252,6 +252,35 @@ struct ifnet {
} \
}
#ifdef KERNEL
#define IF_ENQ_DROP(ifq, m) if_enq_drop(ifq, m)
#if defined(__GNUC__) && defined(MT_HEADER)
static inline int
if_queue_drop(struct ifqueue *ifq, struct mbuf *m)
{
IF_QDROP(ifq);
return 0;
}
static inline int
if_enq_drop(struct ifqueue *ifq, struct mbuf *m)
{
if (IF_QFULL(ifq) &&
!if_queue_drop(ifq, m))
return 0;
IF_ENQUEUE(ifq, m);
return 1;
}
#else
#ifdef MT_HEADER
int if_enq_drop __P((struct ifqueue *, struct mbuf *));
#endif
#endif
#endif /* KERNEL */
#define IFQ_MAXLEN 50
#define IFNET_SLOWHZ 1 /* granularity is 1 second */