Commit f081042d authored by Hangbin Liu's avatar Hangbin Liu Committed by David S. Miller

net/dst: do not confirm neighbor for vxlan and geneve pmtu update

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.

So disable the neigh confirm for vxlan and geneve pmtu update.

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.

Fixes: a93bf0ff ("vxlan: update skb dst pmtu on tx path")
Fixes: 52a589d5 ("geneve: update skb dst pmtu on tx path")
Reviewed-by: default avatarGuillaume Nault <gnault@redhat.com>
Tested-by: default avatarGuillaume Nault <gnault@redhat.com>
Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarHangbin Liu <liuhangbin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4d42df46
...@@ -535,7 +535,7 @@ static inline void skb_tunnel_check_pmtu(struct sk_buff *skb, ...@@ -535,7 +535,7 @@ static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
u32 encap_mtu = dst_mtu(encap_dst); u32 encap_mtu = dst_mtu(encap_dst);
if (skb->len > encap_mtu - headroom) if (skb->len > encap_mtu - headroom)
skb_dst_update_pmtu(skb, encap_mtu - headroom); skb_dst_update_pmtu_no_confirm(skb, encap_mtu - headroom);
} }
#endif /* _NET_DST_H */ #endif /* _NET_DST_H */
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