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

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Message-ID: <1369065770.4616.3.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Mon, 20 May 2013 17:02:50 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
CC:	Or Gerlitz <or.gerlitz@...il.com>,
	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 15:58 +0300, Eliezer Tamir wrote:
> On 20/05/2013 15:28, 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.
> >
> Maybe do the following:
> 1. split the VF PCI IDs into a separate PCI_ID device table.
> 2. have two pci_driver structs, one for all of the PF IDS and one with 
> the VF IDS.
> 3. only register the first pci_driver struct from mlx4_init().
> 4. register the one for the VFs once your PFs are all up and ready.

But hotplug.

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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