netdev - SO_TIMESTAMP on tcp sockets?

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Message-ID: <CALCETrVUjLz63uzr+UTf-G1jq9QDcX6Gf9D6AWK8_GmunsJGnw@mail.gmail.com>
Date:	Mon, 7 May 2012 18:39:48 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Network Development <netdev@...r.kernel.org>
Subject: SO_TIMESTAMP on tcp sockets?

I've been using SO_TIMESTAMPNS to good effect on udp sockets.  I'd
like to do the same thing for tcp.  I realize that this is
semantically strange [1], but I don't think there's a real issue for
my use case.  We have very thin streams -- we are likely to process
each incoming segment as it is received, and I want the most precise
timestamp possible on each segment.

A simple approach (I think) would be for a recvmsg on a tcp socket
with SO_TIMESTAMP(NS) to return at most one skb worth of data along
with the timestamp associated with that skb.  This could be a little
strange if multiple segments overlap or if lro is involved, but
neither of those cases seems like a major problem.

Is there any interest in something like this?

Thanks,
Andy

[1] http://comments.gmane.org/gmane.linux.network/159574
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