netdev - Re: [PATCH net] udp: correct reuseport selection with connected sockets

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Date:   Mon, 16 Sep 2019 09:03:03 +0200 (CEST)
From:   David Miller <davem@...emloft.net>
To:     willemdebruijn.kernel@...il.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, kraig@...gle.com,
        zabele@...cast.net, pabeni@...hat.com, mark.keaton@...theon.com,
        willemb@...gle.com
Subject: Re: [PATCH net] udp: correct reuseport selection with connected
 sockets

From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Date: Thu, 12 Sep 2019 21:16:39 -0400

> From: Willem de Bruijn <willemb@...gle.com>
> 
> UDP reuseport groups can hold a mix unconnected and connected sockets.
> Ensure that connections only receive all traffic to their 4-tuple.
> 
> Fast reuseport returns on the first reuseport match on the assumption
> that all matches are equal. Only if connections are present, return to
> the previous behavior of scoring all sockets.
> 
> Record if connections are present and if so (1) treat such connected
> sockets as an independent match from the group, (2) only return
> 2-tuple matches from reuseport and (3) do not return on the first
> 2-tuple reuseport match to allow for a higher scoring match later.
> 
> New field has_conns is set without locks. No other fields in the
> bitmap are modified at runtime and the field is only ever set
> unconditionally, so an RMW cannot miss a change.
> 
> Fixes: e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")
> Link: http://lkml.kernel.org/r/CA+FuTSfRP09aJNYRt04SS6qj22ViiOEWaWmLAwX0psk8-PGNxw@mail.gmail.com
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied and queued up for -stable, thanks.