netdev - Re: [PATCH net-next-2.6 1/2] be2net: Adding an option to use INTx instead of MSI-X

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Message-ID: <20101025223853.GD15074@solarflare.com>
Date:	Mon, 25 Oct 2010 23:38:53 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
Cc:	somnath.kotur@...lex.com, netdev@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH net-next-2.6 1/2] be2net: Adding an option to use INTx instead of MSI-X

David Miller wrote:
> From: Somnath Kotur <somnath.kotur@...lex.com>
> Date: Mon, 25 Oct 2010 16:42:35 +0530
> 
> > By default, be2net uses MSIx wherever possible.
> > Adding a module parameter to use INTx for users who do not want to use MSIx.
> > 
> > Signed-off-by: Somnath Kotur <somnath.kotur@...lex.com>
> 
> Either add a new ethtool flag, or use the PCI subsystem facilities
> for tweaking things to implement this.
>
> Do not use a module option, otherwise every other networking driver
> author will get the same "cool" idea, give the module option
> different names, and the resulting user experience is terrible.

This has already happened, sadly.  So far as I can see it's mostly done
to allow users to work around systems with broken MSIs; I'm not aware of
any other reason to prefer legacy interrupts.  However, the PCI subsystem
already implements a blacklist and a kernel parameter for disabling MSIs
on these systems.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
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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