From 58f71be58b8713e41f8568938a0199190f723d1d Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Thu, 28 Apr 2022 11:58:48 +0100 Subject: ipv6: refactor ip6_finish_output2() Throw neigh checks in ip6_finish_output2() under a single slow path if, so we don't have the overhead in the hot path. Signed-off-by: Pavel Begunkov Signed-off-by: David S. Miller --- net/ipv6/ip6_output.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) (limited to 'net/ipv6/ip6_output.c') diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index bda1d9f76f7e..afa5bd4ad167 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -119,19 +119,21 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff * rcu_read_lock_bh(); nexthop = rt6_nexthop((struct rt6_info *)dst, daddr); neigh = __ipv6_neigh_lookup_noref(dev, nexthop); - if (unlikely(!neigh)) - neigh = __neigh_create(&nd_tbl, nexthop, dev, false); - if (!IS_ERR(neigh)) { - sock_confirm_neigh(skb, neigh); - ret = neigh_output(neigh, skb, false); - rcu_read_unlock_bh(); - return ret; + + if (unlikely(IS_ERR_OR_NULL(neigh))) { + if (unlikely(!neigh)) + neigh = __neigh_create(&nd_tbl, nexthop, dev, false); + if (IS_ERR(neigh)) { + rcu_read_unlock_bh(); + IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTNOROUTES); + kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_CREATEFAIL); + return -EINVAL; + } } + sock_confirm_neigh(skb, neigh); + ret = neigh_output(neigh, skb, false); rcu_read_unlock_bh(); - - IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTNOROUTES); - kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_CREATEFAIL); - return -EINVAL; + return ret; } static int -- cgit