netdev - Re: [PATCH] tcp: md5 signature check scaling

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Date:	Wed, 27 Oct 2010 15:00:05 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dmitry Popov <dp@...hloadlab.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	William.Allen.Simpson@...il.com,
	Andreas Petlund <apetlund@...ula.no>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Gilad Ben-Yossef <gilad@...efidence.com>,
	Yony Amit <yony@...sleep.com>, Zhu Yi <yi.zhu@...el.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp: md5 signature check scaling

Le mercredi 27 octobre 2010 à 16:52 +0400, Dmitry Popov a écrit :
> From: Dmitry Popov <dp@...hloadlab.com>
> 
> TCP MD5 signature checking without socket lock.
> 
> Each tcp_sock has 2 RCU-protected arrays (tcp[46]_md5sig_info) of
> tcp[46]_md5sig_key address-key pairs.
> Each key (tcp_md5sig_key) has kref struct so that there is no need to
> lock the whole array to work with one key.
> 
> MD5 functions were rewritten according to above statement and hash
> check (tcp_v4_inbound_md5_hash) was moved before socket lock.
> 
> Signed-off-by: Dmitry Popov <dp@...hloadlab.com>
> ---
>  include/linux/tcp.h      |   14 ++-
>  include/net/tcp.h        |   82 +++++++----
>  net/ipv4/tcp_ipv4.c      |  370 ++++++++++++++++++++++++++++------------------
>  net/ipv4/tcp_minisocks.c |   26 +--
>  net/ipv4/tcp_output.c    |   12 +-
>  net/ipv6/tcp_ipv6.c      |  358 +++++++++++++++++++++++++++-----------------
>  6 files changed, 531 insertions(+), 331 deletions(-)

This is a huge patch :(

Reading changelog, I dont understand what you did, and why you did this.

You want to avoid taking the socket lock ? But we need to take it anyway
to process packets.



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