netdev - Re: udp v6 early demux?

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Message-ID: <1423589555.28434.36.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 10 Feb 2015 09:32:35 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vlad Yasevich <vyasevich@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: udp v6 early demux?

On Tue, 2015-02-10 at 12:14 -0500, Vlad Yasevich wrote:
> Hi
> 
> While testing udpv6 lockless path, I noticed that there is no
> support for udpv6 early demux?  Is there a technical reason why,
> or was this just something that got forgotten (kind of like
> lockeless sendmsg)?

If you have a use case for connected UDP ipv6 flows with performance
issues, then you might add early demux I guess.

IPv4 udp early demux has been a bit of a hack actually,
as Shawn main usage was multicast AFAIK

63c6f81cdde5 udp: ipv4: do not waste time in __udp4_lib_mcast_demux_lookup
610438b74496 udp: ipv4: fix potential use after free in udp_v4_early_demux()
f69b923a758f udp: fix a typo in __udp4_lib_mcast_demux_lookup
421b3885bf6d udp: ipv4: Add udp early demux

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