linux-kernel - Re: regression in bonding driver with VLAN challenged interfaces when 8021q module is loaded

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Message-ID: <20121014143237.GA2556@minipsycho.orion>
Date:	Sun, 14 Oct 2012 16:32:37 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Jon Stanley <jstanley@...f.net>
Cc:	fubar@...ibm.com, andy@...yhouse.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, jpirko@...hat.com
Subject: Re: regression in bonding driver with VLAN challenged interfaces
 when 8021q module is loaded

Thu, Oct 11, 2012 at 04:28:40PM CEST, jstanley@...f.net wrote:
>Since commit cc0e40700656b09d93b062ef6c818aa45429d09a, there is a
>problem if you have the 8021q module loaded and you then attempt to
>enslave a VLAN challenged interface. This is because VLAN 0 is
>automatically added to the bond, and the new bond_vlan_used() function
>simply checks for an empty list in bond->vlan_list without taking into
>account that VLAN0 might be on the interface.
>
>This specifically affects IPoIB interfaces in a bond if you do a
>down/up cycle on the bond post-boot (during boot, the bonding module
>is loaded prior to the 8021q module, so everything is fine).
>
>Let me know if further information or testing is needed.

Thanks for the report. I just fixed this by following patch:
http://patchwork.ozlabs.org/patch/191363/

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