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

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Message-ID: <519A1DFD.5080809@linux.intel.com>
Date:	Mon, 20 May 2013 15:58:37 +0300
From:	Eliezer Tamir <eliezer.tamir@...ux.intel.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 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.

Eliezer
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