[PATCHv5 net 7/8] sit: do not confirm neighbor when do pmtu update

From: Hangbin Liu <liuhangbin@gmail.com>
To: netdev@vger.kernel.org
Cc: Julian Anastasov <ja@ssi.bg>,
	Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
	David Ahern <dsahern@gmail.com>,
	Eric Dumazet <edumazet@google.com>,
	Guillaume Nault <gnault@redhat.com>,
	David Miller <davem@davemloft.net>,
	Pablo Neira <pablo@netfilter.org>,
	Stephen Hemminger <stephen@networkplumber.org>,
	Alexey Kodanev <alexey.kodanev@oracle.com>,
	Hangbin Liu <liuhangbin@gmail.com>
Subject: [PATCHv5 net 7/8] sit: do not confirm neighbor when do pmtu update
Date: Sun, 22 Dec 2019 10:51:15 +0800	[thread overview]
Message-ID: <20191222025116.2897-8-liuhangbin@gmail.com> (raw)
In-Reply-To: <20191222025116.2897-1-liuhangbin@gmail.com>

When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.

v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
    dst_ops.update_pmtu to control whether we should do neighbor confirm.
    Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.

Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 net/ipv6/sit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index b2ccbc473127..98954830c40b 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -944,7 +944,7 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
 		}
 
 		if (tunnel->parms.iph.daddr)
-			skb_dst_update_pmtu(skb, mtu);
+			skb_dst_update_pmtu_no_confirm(skb, mtu);
 
 		if (skb->len > mtu && !skb_is_gso(skb)) {
 			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
-- 
2.19.2

