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 09:52:22 -0500
From:	Felipe Balbi <balbi@...com>
To:	Mugunthan V N <mugunthanvnm@...com>
CC:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	Yegor Yefremov <yegorslists@...glemail.com>,
	Felipe Balbi <balbi@...com>
Subject: Re: [net PATCH 1/1] drivers: net: cpsw: fix dual EMAC stall when
 connected to same switch

On Wed, Jun 18, 2014 at 05:21:48PM +0530, Mugunthan V N 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>

Tested yesterday on top of next-20140617

Tested-by: Felipe Balbi <balbi@...com>

> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
> ---
>  drivers/net/ethernet/ti/cpsw.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index ff380da..b988d16 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -1212,7 +1212,12 @@ static int cpsw_ndo_open(struct net_device *ndev)
>  	for_each_slave(priv, cpsw_slave_open, priv);
>  
>  	/* Add default VLAN */
> -	cpsw_add_default_vlan(priv);
> +	if (!priv->data.dual_emac)
> +		cpsw_add_default_vlan(priv);
> +	else
> +		cpsw_ale_add_vlan(priv->ale, priv->data.default_vlan,
> +				  ALE_ALL_PORTS << priv->host_port,
> +				  ALE_ALL_PORTS << priv->host_port, 0, 0);
>  
>  	if (!cpsw_common_res_usage_state(priv)) {
>  		/* setup tx dma to fixed prio and zero offset */
> -- 
> 1.9.2.459.g68773ac
> 

-- 
balbi

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