From 1e5c7466fc7a8db3a30171d28edf3e2e14a97f6b Mon Sep 17 00:00:00 2001
From: wollman <wollman@FreeBSD.org>
Date: Mon, 22 Jul 1996 20:06:01 +0000
Subject: Add a new, better mechanism for sticking packets onto ifqueues. 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).

---
 sys/net/if.h | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'sys/net/if.h')

diff --git a/sys/net/if.h b/sys/net/if.h
index 0827f50..3df1979 100644
--- a/sys/net/if.h
+++ b/sys/net/if.h
@@ -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 */
 
-- 
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