From d51711c0557d6dbd26c63144aef32c7b3ec264b9 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Thu, 28 Sep 2017 13:23:31 +0800 Subject: [PATCH] ip_gre: ipgre_tap device should keep dst Without keeping dst, the tunnel will not update any mtu/pmtu info, since it does not have a dst on the skb. Reproducer: client(ipgre_tap1 - eth1) <-----> (eth1 - ipgre_tap1)server After reducing eth1's mtu on client, then perforamnce became 0. This patch is to netif_keep_dst in gre_tap_init, as ipgre does. Reported-by: Jianlin Shi Signed-off-by: Xin Long Signed-off-by: David S. Miller --- net/ipv4/ip_gre.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 0162fb955b33..8b837f6f5532 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -1223,6 +1223,7 @@ static int gre_tap_init(struct net_device *dev) { __gre_tunnel_init(dev); dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; + netif_keep_dst(dev); return ip_tunnel_init(dev); } -- 2.20.1