netdev - Re: [PATCH 2/2] siw: Add support for CRC32C offload instruction using libcrypto crc32c-intel

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Message-ID: <20100922205943.GI11157@obsidianresearch.com>
Date:	Wed, 22 Sep 2010 14:59:43 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	Bernard Metzler <BMT@...ich.ibm.com>,
	David Miller <davem@...emloft.net>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Roland Dreier <rdreier@...co.com>
Subject: Re: [PATCH 2/2] siw: Add support for CRC32C offload instruction
	using libcrypto crc32c-intel

On Wed, Sep 22, 2010 at 01:38:21PM -0700, Nicholas A. Bellinger wrote:

> Indeed, this would clean up the explict RX/TX CRC32C case quite a
> bit..  Unfortuately I am too busy with other items atm to cook up
> this patch, but I would be happy to test it if someone wants to take
> it.  ;)

Do you even need to do anything at all? crc32c is provided by
crc32c-intel at a higher priority already, so it should be used if it
is available..
 
> > Need CPUID module auto probing. I have an older patch that needs
> > some fixes.

> Hmm, I don't see how that fits in here exactly.  Would you mind
> elaborating a bit..?

Unless the module is loaded the optimized algorithm will not be
available for automatic use. Maybe your patch causes it to autoload
because of the by-name reference? Identifying modules to load by CPUID
will let userspace auto load the appropriate ones based on CPU...

Jason
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