netdev - Re: [PATCH] ipv6: Fix the pmtu path for connected UDP socket

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Message-ID: <CAC15z3hhXxTQ+_Y6DaZcd-XVfCdDO9ZcQD6doNNKt-wHjTXAQw@mail.gmail.com>
Date:	Fri, 18 Mar 2016 14:26:29 -0700
From:	Wei Wang <tracywwnj@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Wei Wang <weiwan@...gle.com>, Martin KaFai Lau <kafai@...com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH] ipv6: Fix the pmtu path for connected UDP socket

I don't think ip6_sk_update_pmtu() is a good place to put it as all it
does is to call ip6_update_pmtu(). And ip6_update_pmtu() does the
route lookup and call __ip6_rt_update_pmtu.
We can put it in ip6_update_pmtu(). But that still means we need to
pass sk to ip6_update_pmtu() and I don't think it makes any difference
compared to the current fix.

Thanks.
Wei

On Fri, Mar 18, 2016 at 11:10 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Fri, Mar 18, 2016 at 10:45 AM, Wei Wang <weiwan@...gle.com> wrote:
>> Thanks all for the comments.
>>
>> Cong, you are right that for ipv6, the code does not take care of updating
>> sk_dst_cache entry like Ipv4. And this patch is updating the entry by
>> calling ip6_dst_store() to achieve similar functionality as Ipv4.
>
> My question is why not updating ip6_sk_update_pmtu() to sync with ipv4?