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

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Message-ID: <20090507093137.GD32039@redhat.com>
Date:	Thu, 7 May 2009 12:31:37 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Sheng Yang <sheng@...ux.intel.com>
Cc:	kvm@...r.kernel.org, jbarnes@...tuousgeek.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Matthew Wilcox <willy@...ux.intel.com>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] msi-x: let drivers retry when not enough vectors

On Thu, May 07, 2009 at 05:10:46PM +0800, Sheng Yang wrote:
> > > I think driver should read from capability list to know how many vector
> > > supported by this device before enable MSI-X for device, as
> > > pci_msix_table_size() did...
> >
> > Drivers can do this, but it's more code. Since pci_enable_msix
> > calls pci_msix_table_size already, let it do the work. Right?
> 
> If you don't know the vectors number before you enable MSI-X, how can you 
> setup vectors? 

I don't know how many irqs I will be able to get anyway.
vectors that can't be assigned are useless ...

-- 
MST
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