linux-kernel - Re: [PATCH] msi-x: let drivers retry when not enough vectors

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Message-ID: <20090611112818.149b568e@jbarnes-g45>
Date:	Thu, 11 Jun 2009 11:28:18 -0700
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Matthew Wilcox <willy@...ux.intel.com>,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org
Subject: Re: [PATCH] msi-x: let drivers retry when not enough vectors

On Thu, 7 May 2009 11:28:41 +0300
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> pci_enable_msix currently returns -EINVAL if you ask
> for more vectors than supported by the device, which would
> typically cause fallback to regular interrupts.
> 
> It's better to return the table size, making the driver retry
> MSI-X with less vectors.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> 
> Hi Jesse,
> This came up when I was adding MSI-X support to virtio pci driver,
> which does not know the exact table size upfront.
> Could you consider this patch for 2.6.31 please?

Applied this one to my linux-next branch; hopefully Rusty won't mind
too much. :)

-- 
Jesse Barnes, Intel Open Source Technology Center
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