linux-kernel - Re: [PATCH net-next 28/35] qlcnic: Use pci_enable_msix_range() instead of pci_enable

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Date:	Sat, 22 Feb 2014 00:48:47 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Himanshu Madhani <himanshu.madhani@...gic.com>,
	Rajesh Borundia <rajesh.borundia@...gic.com>,
	Shahed Shaikh <shahed.shaikh@...gic.com>,
	linux-driver@...gic.com, netdev@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH net-next 28/35] qlcnic: Use pci_enable_msix_range()
 instead of pci_enable_msix()

On Sat, 2014-02-22 at 00:44 +0000, Ben Hutchings wrote:
> On Tue, 2014-02-18 at 11:11 +0100, Alexander Gordeev wrote:
> > As result of deprecation of MSI-X/MSI enablement functions
> > pci_enable_msix() and pci_enable_msi_block() all drivers
> > using these two interfaces need to be updated to use the
> > new pci_enable_msi_range() and pci_enable_msix_range()
> > interfaces.
[...]
> > --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
> > +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
> > @@ -701,13 +701,17 @@ enable_msix:
> >  		for (vector = 0; vector < num_msix; vector++)
> >  			adapter->msix_entries[vector].entry = vector;
> >  
> > -		err = pci_enable_msix(pdev, adapter->msix_entries, num_msix);
> > -		if (err == 0) {
> > +		err = pci_enable_msix_range(pdev,
> > +					    adapter->msix_entries, 1, num_msix);
> > +
> > +		if (err == num_msix) {
> >  			adapter->flags |= QLCNIC_MSIX_ENABLED;
> >  			adapter->ahw->num_msix = num_msix;
> >  			dev_info(&pdev->dev, "using msi-x interrupts\n");
> >  			return 0;
> >  		} else if (err > 0) {
> > +			pci_disable_msix(pdev);
> > +
> >  			dev_info(&pdev->dev,
> >  				 "Unable to allocate %d MSI-X vectors, Available vectors %d\n",
> >  				 num_msix, err);
> 
> Well this log message is nonsense - we have no idea how many vectors are
> available any more.
> 
> You should remove this and the retry loop that is no longer needed.

Sorry, I'm confused and this does work.  But I wonder whether it is
really an improvement over using the old API.

Ben.

-- 
Ben Hutchings
I haven't lost my mind; it's backed up on tape somewhere.

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