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From: Kip Macy <kmacy@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
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Subject: PERFORCE change 126491 for review
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http://perforce.freebsd.org/chv.cgi?CH=126491

Change 126491 by kmacy@kmacy_home:ethng on 2007/09/16 22:02:56

	avoid the extra lock acquisitions incurred by rt_check
	if the interface is up and the gateway is set

Affected files ...

.. //depot/projects/ethng/src/sys/netinet/if_ether.c#3 edit

Differences ...

==== //depot/projects/ethng/src/sys/netinet/if_ether.c#3 (text+ko) ====

@@ -358,7 +358,7 @@
 	struct llinfo_arp *la = NULL;
 	struct rtentry *rt = NULL;
 	struct sockaddr_dl *sdl;
-	int error;
+	int error = 0;
 
 	if (m->m_flags & M_BCAST) {	/* broadcast */
 		(void)memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen);
@@ -370,7 +370,11 @@
 	}
 
 	if (rt0 != NULL) {
-		error = rt_check(&rt, &rt0, dst);
+		if (((rt0->rt_flags && RTF_UP) == 0) ||
+		    ((rt0->rt_flags & RTF_GATEWAY) && (rt0->rt_gateway == NULL)))
+			error = rt_check(&rt, &rt0, dst);
+		else
+			rt = rt0;
 		if (error) {
 			m_freem(m);
 			return error;