netdev - [PATCH v2 4/4] ipv4: optimize route adding on secondary promotion

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Message-Id: <201103192213.p2JMDs0S003092@ja.ssi.bg>
Date:	Sun, 20 Mar 2011 00:13:54 +0200
From:	Julian Anastasov <ja@....bg>
To:	netdev@...r.kernel.org
CC:	David Miller <davem@...emloft.net>
Subject: [PATCH v2 4/4] ipv4: optimize route adding on secondary promotion

	Optimize the calling of fib_add_ifaddr for all
secondary addresses after the promoted one to start from
their place, not from the new place of the promoted
secondary. It will save some CPU cycles because we
are sure the promoted secondary was first for the subnet
and all next secondaries do not change their place.

Signed-off-by: Julian Anastasov <ja@....bg>
---
 net/ipv4/devinet.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -urp net-next-2.6-bef55ae/linux/net/ipv4/devinet.c linux/net/ipv4/devinet.c
--- net-next-2.6-bef55ae/linux/net/ipv4/devinet.c	2011-03-18 00:57:39.000000000 +0200
+++ linux/net/ipv4/devinet.c	2011-03-18 10:40:08.135271482 +0200
@@ -375,6 +375,7 @@ static void __inet_del_ifa(struct in_dev
 	blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
 
 	if (promote) {
+		struct in_ifaddr *next_sec = promote->ifa_next;
 
 		if (prev_prom) {
 			prev_prom->ifa_next = promote->ifa_next;
@@ -386,7 +387,7 @@ static void __inet_del_ifa(struct in_dev
 		rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
 		blocking_notifier_call_chain(&inetaddr_chain,
 				NETDEV_UP, promote);
-		for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
+		for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
 			if (ifa1->ifa_mask != ifa->ifa_mask ||
 			    !inet_ifa_match(ifa1->ifa_address, ifa))
 					continue;
--
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