netdev - Re: [PATCH] igbvf: avoid name clash between PF and VF

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Date:	Wed, 30 Jun 2010 15:07:35 +0200
From:	Harald Hoyer <harald@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Stefan Assmann <sassmann@...hat.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev <netdev@...r.kernel.org>,
	e1000-devel@...ts.sourceforge.net,
	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	gregory.v.rose@...el.com, jeffrey.t.kirsher@...el.com,
	Andy Gospodarek <gospo@...hat.com>
Subject: Re: [PATCH] igbvf: avoid name clash between PF and VF

On 06/30/2010 01:11 PM, Kay Sievers wrote:
> On Wed, Jun 30, 2010 at 12:57, Stefan Assmann<sassmann@...hat.com>  wrote:
>> On 30.06.2010 12:44, Ben Hutchings wrote:
>>> On Wed, 2010-06-30 at 10:53 +0200, Stefan Assmann wrote:
>>>> From: Stefan Assmann<sassmann@...hat.com>
>>>>
>>>> It looks like the VFs get initialized before all the PFs are. Therefore
>>>> the udev mapping MAC<->  ethX (for PFs) gets screwed because the VFs
>>>> may grab the ethX interface names (reserved by udev) for the PFs.
>>>>
>>>> Example:
>>>> igb max_vfs=0
>>>> eth0      Link encap:Ethernet  HWaddr 00:13:20:F7:A5:9E
>>>> eth1      Link encap:Ethernet  HWaddr 00:13:20:F7:A5:9F
>>>> eth2      Link encap:Ethernet  HWaddr 00:13:20:F7:A5:A0
>>>> eth3      Link encap:Ethernet  HWaddr 00:13:20:F7:A5:A1
>>>> igb max_vfs=1
>>>> eth0      Link encap:Ethernet  HWaddr 00:13:20:F7:A5:9E
>>>> eth1      Link encap:Ethernet  HWaddr 0A:CF:41:69:F7:A9
>>>> eth2      Link encap:Ethernet  HWaddr 3A:FE:20:4C:2A:3B
>>>> eth3      Link encap:Ethernet  HWaddr C6:C3:B1:56:C9:A4
>>>> eth3_rename Link encap:Ethernet  HWaddr 00:13:20:F7:A5:9F
>>>> eth4      Link encap:Ethernet  HWaddr 6E:8A:8A:A3:5F:69
>>>> eth4_rename Link encap:Ethernet  HWaddr 00:13:20:F7:A5:A0
>>>> eth5_rename Link encap:Ethernet  HWaddr 00:13:20:F7:A5:A1
>>>>
>>>> In the example above VF 0A:CF:41:69:F7:A9 grabs eth1 but udev
>>>> has a rule that says eth1 should be assigned PF 00:13:20:F7:A5:9F
>>>> (eth3_rename) and waits for the VF to disappear to rename eth3_rename
>>>> to eth1. Unfortunately eth1 is not going to disappear.
>>>> This is not a udev bug since udev doesn't create persistent rules for
>>>> VFs as their MAC address changes every reboot.
>>> [...]
>>>
>>> I think it is a bug in the udev rules: udev should rename the VFs even
>>> though their names won't be persistent.
>
> Udev writes out these configs to a rules file, and therefore can never
> handle random MAC addresses, as they would just accumulate in the
> rules file with a new entry at every bootup.
>
> Stuff like this is just not supported at the moment with the rather
> simple logic it has, and there is no current plan/idea, or anybody
> working on changing/improving this at the moment.
>
> Kay

Solution: move away from the "eth*" namespace and use "net*" for configured 
interfaces.
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