linux-kernel - Re: [PATCH] PCI: Init NumVFs register to zero in sriov

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Message-ID: <CAErSpo4ReYw5koMrwcuNQj7yfFXvDnuZGiRc70mekv6L40KjWw@mail.gmail.com>
Date:	Tue, 19 Nov 2013 17:07:35 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	"ethan.zhao" <ethan.kernel@...il.com>
Cc:	Yu Zhao <yu.zhao@...el.com>, Yinghai Lu <yinghai@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] PCI: Init NumVFs register to zero in sriov_init()

On Tue, Nov 19, 2013 at 3:24 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> [+cc linux-pci]
>
> On Wed, Nov 6, 2013 at 7:49 AM, ethan.zhao <ethan.kernel@...il.com> wrote:
>> Though no specification about NumVFs register initial value after POST, to void the confusion
>> lspci output as following before VF was enabled, we should clear the NumVFs value left by BIOS
>> to zero:
>>
>> $lspci -vvv -s 03:00.0
>> Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
>> ~
>> Capabilities: [160 v1] Single Root I/O Virtualization (SR-IOV)
>>                 IOVCap: Migration-, Interrupt Message Number: 000
>>                 IOVCtl: Enable+ Migration- Interrupt- MSE+ ARIHierarchy+
>>                 IOVSta: Migration-
>>                 Initial VFs: 64, Total VFs: 64, Number of VFs: 64, Function Dependency Link: 00
>>                                                               ^dazed !

Did you mean to show lspci output from before SR-IOV was enabled?  It
looks like SR-IOV is enabled here, so I don't think your patch would
change this output at all.

Bjorn
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