[src/trunk]: src/sys/net If M_PKTHDR is set we can use m_pkthdr.len instead o...

[darrenr <darrenr%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/868cae636bd9
branches:  trunk
changeset: 536584:868cae636bd9
user:      darrenr <darrenr%NetBSD.org@localhost>
date:      Thu Sep 19 00:34:00 2002 +0000

description:
If M_PKTHDR is set we can use m_pkthdr.len instead of the for loop.

diffstat:

 sys/net/bpf.c |  14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diffs (35 lines):

diff -r c85e6e3a1abe -r 868cae636bd9 sys/net/bpf.c
--- a/sys/net/bpf.c     Thu Sep 19 00:01:33 2002 +0000
+++ b/sys/net/bpf.c     Thu Sep 19 00:34:00 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bpf.c,v 1.69 2002/09/15 23:44:12 thorpej Exp $ */
+/*     $NetBSD: bpf.c,v 1.70 2002/09/19 00:34:00 darrenr Exp $ */
 
 /*
  * Copyright (c) 1990, 1991, 1993
@@ -43,7 +43,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bpf.c,v 1.69 2002/09/15 23:44:12 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bpf.c,v 1.70 2002/09/19 00:34:00 darrenr Exp $");
 
 #include "bpfilter.h"
 
@@ -1130,9 +1130,13 @@
        u_int pktlen, slen;
        struct mbuf *m0;
 
-       pktlen = 0;
-       for (m0 = m; m0 != 0; m0 = m0->m_next)
-               pktlen += m0->m_len;
+       if ((m->m_flags & M_PKTHDR) != 0) {
+               pktlen = m->m_pkthdr.len
+       } else {
+               pktlen = 0;
+               for (m0 = m; m0 != 0; m0 = m0->m_next)
+                       pktlen += m0->m_len;
+       }
 
        for (d = bp->bif_dlist; d != 0; d = d->bd_next) {
                ++d->bd_rcount;