Re: [PATCH net 2/2] net: dsa: mt7530: trap frames to conduit in MFC on EN7581 and AN7583

[Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>]

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> On MT7531 and MT7988 switches, trapped frames forwarding is directed to
> CPU ports specified in the MT7531_CFC (0x04) CPU_PMAP bitmap. When support
> for EN7581 was introduced, it was assumed to follow the MT7531 model.
> 
> However, on Airoha EN7581 and AN7583 switch IP, setting MT7531_CFC alone
> is not sufficient for trapped control frames (such as STP BPDUs) to exit
> towards the CPU port. The switch forwarding hardware also requires the
> MT7530_CPU_EN bit and MT7530_CPU_PORT field to be enabled in MT753X_MFC
> (0x10). Without this, trapped frames are dropped by the switch forwarding
> logic and never reach the CPU conduit.
> 
> Include ID_EN7581 and ID_AN7583 in mt753x_conduit_state_change() to set
> MT7530_CPU_EN and MT7530_CPU_PORT in MT753X_MFC when the conduit becomes
> operational, matching the handling for MT7530, MT7621, and EN7528.
> 
> Fixes: 2b0229f67932 ("net: dsa: mt7530: Add EN7581 support")
> Signed-off-by: Tao <gongtao0607@gmail.com>

Acked-by: Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>

> ---
>  drivers/net/dsa/mt7530.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index 863f2079833f..9693a55f553e 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -3309,7 +3309,8 @@ mt753x_conduit_state_change(struct dsa_switch *ds,
>  	 * interface is up.
>  	 */
>  	if (priv->id != ID_MT7530 && priv->id != ID_MT7621 &&
> -	    priv->id != ID_EN7528)
> +	    priv->id != ID_EN7528 &&
> +	    priv->id != ID_EN7581 && priv->id != ID_AN7583)
>  		return;
>  
>  	mask = BIT(cpu_dp->index);
> -- 
> 2.55.0
> 
> 

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