netdev - Re: [PATCH net-next 01/11] sfc: Implement 128-bit writes for efx_writeo

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Message-ID: <1342109847.2662.15.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Thu, 12 Jul 2012 17:17:27 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <linux-net-drivers@...arflare.com>
Subject: Re: [PATCH net-next 01/11] sfc: Implement 128-bit writes for
 efx_writeo_page

On Thu, 2012-07-12 at 08:13 -0700, David Miller wrote:
> From: Ben Hutchings <bhutchings@...arflare.com>
> Date: Thu, 12 Jul 2012 00:15:18 +0100
> 
> > Add support for writing a TX descriptor to the NIC in one PCIe
> > transaction on x86_64 machines.
> > 
> > Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> 
> This absolutely does not belong in a driver.

OK.  My assumption was that 128-bit MMIO on a data path would be so rare
that this would not be generically useful.  (Really long MMIOs are
likely to be done with write-combining, so that the data width of
instructions doesn't matter much.)

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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