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/ip_fragment.c b/net/ipv4/ip_fragment.c
index 7ad88e5e7110..8d07c973409c 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -258,8 +258,8 @@ static void ip_expire(unsigned long arg)
                 /* skb dst is stale, drop it, and perform route lookup again */
                 skb_dst_drop(head);
                 iph = ip_hdr(head);
-                err = ip_route_input(head, iph->daddr, iph->saddr,
-                                     iph->tos, head->dev);
+                err = ip_route_input_noref(head, iph->daddr, iph->saddr,
+                                           iph->tos, head->dev);
                 if (err)
                         goto out_rcu_unlock;