netdev - Re: [PATCH net] ip6_tunnel: Don't update PMTU on tunnels with collect

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Date:   Mon, 15 Oct 2018 10:48:05 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Stefano Brivio <sbrivio@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...com>, netdev@...r.kernel.org
Subject: Re: [PATCH net] ip6_tunnel: Don't update PMTU on tunnels with
 collect_md

Le 12/10/2018 à 18:34, Stefano Brivio a écrit :
> On Fri, 12 Oct 2018 17:58:55 +0200
> Nicolas Dichtel <nicolas.dichtel@...nd.com> wrote:
[snip]
>> Could you explain in your commit log which problem your patch fixes?
> 
> Nothing really.
> 
> The change in f15ca723c1eb looked accidental and I thought it doesn't
> make sense to update the PMTU in that case, but I didn't figure out
> it's not actually done anyway.
> 
> Maybe it makes things a bit more readable, in that case I'd target it
> for net-next. What do you think?
> 
I don't think that this patch helps. The purpose of the skb_dst_update_pmtu()
helper is to hide those things. If one day, update_pmtu is defined for
md_dst_op, I bet that we won't remove this test.


Regards,
Nicolas