Date: Tue, 8 Oct 2013 09:33:02 +0200
From: Alexander Gordeev <agordeev@redhat.com>
To: Michael Ellerman <michael@ellerman.id.au>
Cc: linux-kernel@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
        Ralf Baechle <ralf@linux-mips.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Ingo Molnar <mingo@redhat.com>, Tejun Heo <tj@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>, Andy King <acking@vmware.com>,
        Jon Mason <jon.mason@intel.com>,
        Matt Porter <mporter@kernel.crashing.org>, linux-pci@vger.kernel.org,
        linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org,
        linux390@de.ibm.com, linux-s390@vger.kernel.org, x86@kernel.org,
        linux-ide@vger.kernel.org, iss_storagedev@hp.com,
        linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org,
        netdev@vger.kernel.org, e1000-devel@lists.sourceforge.net,
        linux-driver@qlogic.com,
        Solarflare linux maintainers <linux-net-drivers@solarflare.com>,
        "VMware, Inc." <pv-drivers@vmware.com>, linux-scsi@vger.kernel.org
Subject: Re: [PATCH RFC 00/77] Re-design MSI/MSI-X interrupts enablement
 pattern
Message-ID: <20131008073301.GC10669@dhcp-26-207.brq.redhat.com>
References: <cover.1380703262.git.agordeev@redhat.com>
 <20131008043330.GF31666@concordia>
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On Tue, Oct 08, 2013 at 03:33:30PM +1100, Michael Ellerman wrote:
> On Wed, Oct 02, 2013 at 12:29:04PM +0200, Alexander Gordeev wrote:
> > This technique proved to be confusing and error-prone. Vast share
> > of device drivers simply fail to follow the described guidelines.
> 
> To clarify "Vast share of device drivers":
> 
>  - 58 drivers call pci_enable_msix()
>  - 24 try a single allocation and then fallback to MSI/LSI
>  - 19 use the loop style allocation as above
>  - 14 try an allocation, and if it fails retry once
>  - 1  incorrectly continues when pci_enable_msix() returns > 0
> 
> So 33 drivers (> 50%) successfully make use of the "confusing and
> error-prone" return value.

Ok, you caught me - 'vast share' is incorrect and is a subject to
rewording. But out of 19/58 how many drivers tested fallbacks on the
real hardware? IOW, which drivers are affected by the pSeries quota?

> And yes, one is buggy, so obviously the interface is too complex. Thanks
> drivers/ntb/ntb_hw.c

vmxnet3 would be the best example.

> cheers

-- 
Regards,
Alexander Gordeev
agordeev@redhat.com
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