geneve: update skb dst pmtu on tx path

commit 52a589d51f1008f62569bf89e95b26221ee76690 upstream.

Commit a93bf0ff4490 ("vxlan: update skb dst pmtu on tx path") has fixed
a performance issue caused by the change of lower dev's mtu for vxlan.

The same thing needs to be done for geneve as well.

Note that geneve cannot adjust it's mtu according to lower dev's mtu
when creating it. The performance is very low later when netperfing
over it without fixing the mtu manually. This patch could also avoid
this issue.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Thomas Deutschmann <whissi@gentoo.org>
Cc: Eddie Chapman <eddie@ehuk.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index b9d8d71a6ecc485ccab1af6f0831aeaf1a2e88d8..1b0fcf0b2afaf356292ae15f06fadb6b762c7344 100644 (file)
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -825,6 +825,13 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
        if (IS_ERR(rt))
                return PTR_ERR(rt);
 
+       if (skb_dst(skb)) {
+               int mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr) -
+                         GENEVE_BASE_HLEN - info->options_len - 14;
+
+               skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
+       }
+
        sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
        if (geneve->collect_md) {
                tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
@@ -864,6 +871,13 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
        if (IS_ERR(dst))
                return PTR_ERR(dst);
 
+       if (skb_dst(skb)) {
+               int mtu = dst_mtu(dst) - sizeof(struct ipv6hdr) -
+                         GENEVE_BASE_HLEN - info->options_len - 14;
+
+               skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
+       }
+
        sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
        if (geneve->collect_md) {
                prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);