netdev - Re: [PATCHv4 net 8/8] net/dst: do not confirm neighbor for vxlan and geneve pmtu update

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Date:   Sat, 21 Dec 2019 19:38:42 +0100
From:   Guillaume Nault <gnault@...hat.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, Julian Anastasov <ja@....bg>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        David Ahern <dsahern@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        Pablo Neira <pablo@...filter.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Alexey Kodanev <alexey.kodanev@...cle.com>
Subject: Re: [PATCHv4 net 8/8] net/dst: do not confirm neighbor for vxlan and
 geneve pmtu update

On Fri, Dec 20, 2019 at 11:25:25AM +0800, Hangbin Liu wrote:
> 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.
> 
> 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: a93bf0ff4490 ("vxlan: update skb dst pmtu on tx path")
> Fixes: 52a589d51f10 ("geneve: update skb dst pmtu on tx path")
> Reviewed-by: Guillaume Nault <gnault@...hat.com>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  include/net/dst.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/net/dst.h b/include/net/dst.h
> index 208e7c0c89d8..626cf614ad86 100644
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -535,7 +535,7 @@ static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
>  	u32 encap_mtu = dst_mtu(encap_dst);
>  
>  	if (skb->len > encap_mtu - headroom)
> -		skb_dst_update_pmtu(skb, encap_mtu - headroom);
> +		skb_dst_update_pmtu_no_confirm(skb, encap_mtu - headroom);
>  }
>  
Tested-by: Guillaume Nault <gnault@...hat.com>