linux-kernel - Re: [PATCH 4/5] PCI: Add max_vfs in sysfs per pci device where supports

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Message-ID: <CAE9FiQWK0jckdXx6S8LCLDSAfU8+318Qp1txe14McmvZN3v6MA@mail.gmail.com>
Date:	Thu, 4 Oct 2012 08:13:50 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Don Dutile <ddutile@...hat.com>, yuvalmin@...adcom.com,
	bhutchings@...arflare.com, gregory.v.rose@...el.com,
	davem@...emloft.net
Subject: Re: [PATCH 4/5] PCI: Add max_vfs in sysfs per pci device where supports

On Thu, Oct 4, 2012 at 7:15 AM, Konrad Rzeszutek Wilk <konrad@...nel.org> wrote:
> On Wed, Oct 03, 2012 at 10:51:34AM -0700, Yinghai Lu wrote:
>> only pci device that support sriov will have max_vfs show up in /sys
>   ^-Only   ^-devices           ^-SRIOV
>
>>
>> when user set value in /sys, driver ops set_max_vfs will be called to enable
>> VF there.
>
> Huh? What value? What are they enabling? Your comment makes it sound as
> if setting any value (say '0xdeadbeef') will be called to enable a VF.
>
> I don't think that is what the code does. Can you explain what the
> proper values are to be submitted to the SysFS value 'max_vfs' and
> what the kernel ought to be doing? Perhaps include a little snippet
> from the kernel log so if somebody has a bug they can look at see
> what you got and can compare?

I sent out this patches  as reference or base for Don and greg.rose
and other sriov guys.

Anyway, thank you for review them.

Yinghai
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