linux-kernel - Re: [PATCH v2 6/7] PCI: Make sure VF's driver get attached after PF's

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Message-ID: <1369066035.4616.6.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Mon, 20 May 2013 17:07:15 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Or Gerlitz <or.gerlitz@...il.com>
CC:	Greg Rose <gregory.v.rose@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Yan Burman <yanb@...lanox.com>,
	Sathya Perla <Sathya.Perla@...lex.com>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH v2 6/7] PCI: Make sure VF's driver get attached after
 PF's

On Mon, 2013-05-20 at 15:28 +0300, Or Gerlitz wrote:
> On Wed, May 15, 2013 at 7:12 PM, Greg Rose <gregory.v.rose@...el.com> wrote:
> 
> 
> > I'm really not a fan of this.  Seems to me the tail is wagging the dog
> > here.  Fix the driver to work without a PF driver being present.
> 
> Greg, Alex,
> 
> As I wrote over the V1 thread, currently we can't go and patch mlx4 to
> use the sysfs API nor defer the call from within our probe function to
> enable sriov since  this requires some firmware change to allow
> enabling SRIOV after some  resources are initialized/provisioned.
> Hence the patch suggested here or any other patch we can agree on
> which will make sure that VF probing is done only once the PF is ready
> is preferred, I think.
> 
> I wasn't sure to totally follow on the argument that things need to
> work when the PF is absent in the sense there's no driver instance
> around over which the PF is probed, if you can explain little better,
> that would help.

It might be sufficient to return -EPROBE_DEFER from the VF probe
function when the PF is not yet ready, if you can easily detect that.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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