netdev - Re: [PATCH] tcp: expose listen socket backlog via SIOCGBACKLOG

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Date:	Wed, 06 May 2015 19:45:51 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Derrick Pallas <pallas@...aki.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp: expose listen socket backlog via SIOCGBACKLOG

On Wed, 2015-05-06 at 19:21 -0700, Derrick Pallas wrote:
> This IOCTL exposes the current backlog for a listen socket.  This value can
> be useful in userland, e.g. in an overloaded transparent proxy that would
> rather push new connections into bypass than have then hang waiting for
> accept.  Knowing the current backlog allows this process to make that
> decision and then begin intercepting connections again once the backlog
> falls to a reasonable level.
> 
> Signed-off-by: Derrick Pallas <pallas@...aki.com>
> ---

No, we do not add new ioctl() anymore.

Note that getsockopt(fd, SOL_TCP, TCP_INFO, &info, sizeof(info)) already
provides the information you need in info.tcpi_unacked

(and info.tcpi_sacked contains sk_max_ack_backlog)

http://lxr.free-electrons.com/source/net/ipv4/tcp.c#L2630



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