netdev - Re: [net PATCH 1/1] drivers: net: cpsw: fix dual EMAC stall when connected to same switch

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Date:	Wed, 18 Jun 2014 15:01:29 +0200
From:	Yegor Yefremov <yegorslists@...glemail.com>
To:	Mugunthan V N <mugunthanvnm@...com>
Cc:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Felipe Balbi <balbi@...com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [net PATCH 1/1] drivers: net: cpsw: fix dual EMAC stall when
 connected to same switch

On Wed, Jun 18, 2014 at 1:51 PM, Mugunthan V N <mugunthanvnm@...com> wrote:
> In commit 629c9a8fd0bbdfc6d702526b327470166ec39c6b (drivers: net: cpsw: Add
> default vlan for dual emac case also), api cpsw_add_default_vlan() also
> changes the port vlan which is required to seperate the ports which results
> in the following behavior
>
> In Dual EMAC mode, when both the Etnernet connected is connected to same
> switch, it creates a loop in the switch and when a broadcast packet is
> received it is forwarded to the other port which stalls the whole switch
> and needs a reset/power cycle to the switch to recover. So intead of using
> the api, add only the default VLAN entry in dual EMAC case.
>
> Cc: Yegor Yefremov <yegorslists@...glemail.com>
> Cc: Felipe Balbi <balbi@...com>
> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
> ---

Thanks a lot. I have two interfaces connected to the same switch with
different subnets and everything is working.

Tested-by: Yegor Yefremov <yegorslists@...glemail.com>

Regards,
Yegor
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