From f2bb4bedf35d5167a073dcdddf16543f351ef3ae Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 17 Jul 2012 12:20:47 -0700 Subject: ipv4: Cache output routes in fib_info nexthops. If we have an output route that lacks nexthop exceptions, we can cache it in the FIB info nexthop. Such routes will have DST_HOST cleared because such routes refer to a family of destinations, rather than just one. The sequence of the handling of exceptions during route lookup is adjusted to make the logic work properly. Before we allocate the route, we lookup the exception. Then we know if we will cache this route or not, and therefore whether DST_HOST should be set on the allocated route. Then we use DST_HOST to key off whether we should store the resulting route, during rt_set_nexthop(), in the FIB nexthop cache. With help from Eric Dumazet. Signed-off-by: David S. Miller --- net/ipv4/fib_semantics.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net/ipv4/fib_semantics.c') diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 2b57d768240..83d0f42b619 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -171,6 +171,8 @@ static void free_fib_info_rcu(struct rcu_head *head) dev_put(nexthop_nh->nh_dev); if (nexthop_nh->nh_exceptions) free_nh_exceptions(nexthop_nh); + if (nexthop_nh->nh_rth_output) + dst_release(&nexthop_nh->nh_rth_output->dst); } endfor_nexthops(fi); release_net(fi->fib_net); -- cgit v1.2.3-70-g09d2