netdev - Re: [RFC PATCH net 3/4] ipv6: datagram: Update dst cache of a connected datagram sk during pmtu update

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Message-ID: <20160406001141.GA97608@kafai-mba.local>
Date:	Tue, 5 Apr 2016 17:11:41 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Cong Wang <xiyou.wangcong@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Wei Wang <weiwan@...gle.com>, Kernel Team <kernel-team@...com>
Subject: Re: [RFC PATCH net 3/4] ipv6: datagram: Update dst cache of a
 connected datagram sk during pmtu update

On Mon, Apr 04, 2016 at 01:45:02PM -0700, Cong Wang wrote:
> I see your point, but calling __ip6_datagram_connect() seems overkill
> here, we don't need to update so many things in the pmtu update context,
> at least IPv4 doesn't do that either. I don't think you have to do that.
>
> So why just updating the dst cache (also some addr cache) here is not
> enough?
I am not sure I understand.  I could be missing something.

This patch uses ip6_datagram_dst_update() to do the route lookup and
sk->sk_dst_cache update.  ip6_datagram_dst_update() is
created in the first two refactoring patches and is also used by
__ip6_datagram_connect().

Which operations in ip6_datagram_dst_update() could be saved
during the pmtu update?