ipv4: Fix input route performance regression.

With the routing cache removal we lost the "noref" code paths on
input, and this can kill some routing workloads.

Reinstate the noref path when we hit a cached route in the FIB
nexthops.

With help from Eric Dumazet.

Reported-by: Alexander Duyck <alexander.duyck@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index e55171f184f9..da0cc2e6b250 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -172,9 +172,9 @@ static void free_fib_info_rcu(struct rcu_head *head)
                 if (nexthop_nh->nh_exceptions)
                         free_nh_exceptions(nexthop_nh);
                 if (nexthop_nh->nh_rth_output)
-                        dst_release(&nexthop_nh->nh_rth_output->dst);
+                        dst_free(&nexthop_nh->nh_rth_output->dst);
                 if (nexthop_nh->nh_rth_input)
-                        dst_release(&nexthop_nh->nh_rth_input->dst);
+                        dst_free(&nexthop_nh->nh_rth_input->dst);
         } endfor_nexthops(fi);
 
         release_net(fi->fib_net);