netdev - Re: TCP-MD5 checksum failure on x86

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Date:	Fri, 7 May 2010 10:36:39 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, bhaskie@...il.com,
	bhutchings@...arflare.com, netdev@...r.kernel.org
Subject: Re: TCP-MD5 checksum failure on x86_64 SMP

On Fri, 07 May 2010 19:21:33 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote:

> Le vendredi 07 mai 2010 à 10:14 -0700, Stephen Hemminger a écrit :
> 
> > Forget the per cpu data; the pool should just be scrapped.
> > 
> > The only reason the pool exists is that the crypto hash state which
> > should just be moved into the md5_info (88 bytes).  The pseudo
> > header can just be generated on the stack before passing to the crypto
> > code.
> 
> 
> Sure, but I'm afraid there is no generic API do do that (if we want to
> reuse crypto/md5.c code).

It looks like the pool is just an optimization to avoid opening too
many crypto API connections.  This should only be an issue if offloading
MD5.
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