netdev - Re: [PATCH net] bonding: correctly handle bonding type change on enslave failure

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Date:	Mon, 20 Jul 2015 16:23:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	razor@...ckwall.org
Cc:	netdev@...r.kernel.org, monis@...taire.com, j.vosburgh@...il.com,
	gospo@...ulusnetworks.com, vfalico@...il.com,
	nikolay@...ulusnetworks.com
Subject: Re: [PATCH net] bonding: correctly handle bonding type change on
 enslave failure

From: Nikolay Aleksandrov <razor@...ckwall.org>
Date: Wed, 15 Jul 2015 22:57:01 +0200

> From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> 
> If the bond is enslaving a device with different type it will be setup
> by it, but if after being setup the enslave fails the bond doesn't
> switch back its type and also keeps pointers to foreign structures that can
> be long gone. Thus revert back any type changes if the enslave failed and
> the bond had to change its type.
> Example:
>  Before patch:
> $ echo lo > bond0/bonding/slaves
> -bash: echo: write error: Cannot assign requested address
> $ ip l sh bond0
> 20: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN
> mode DEFAULT group default
>     link/loopback 16:54:78:34:bd:41 brd 00:00:00:00:00:00
> $ echo +eth1 > bond0/bonding/slaves
> $ ip l sh bond0
> 20: bond0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode
> DEFAULT group default qlen 1000
>     link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff
> (notice the MASTER flag is gone)
> 
>  After patch:
> $ echo lo > bond0/bonding/slaves
> -bash: echo: write error: Cannot assign requested address
> $ ip l sh bond0
> 21: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN
> mode DEFAULT group default qlen 1000
>     link/ether 6e:66:94:f6:07:fc brd ff:ff:ff:ff:ff:ff
> $ echo +eth1 > bond0/bonding/slaves
> $ ip l sh bond0
> 21: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN
> mode DEFAULT group default qlen 1000
>     link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff
> 
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> Fixes: e36b9d16c6a6 ("bonding: clean muticast addresses when device changes type")

Applied.
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