netdev - Re: [PATCH v2] net: ethernet: ti: ale: ensure vlan/mdb deleted when no members

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Date:   Sat, 30 Nov 2019 03:28:12 -0800
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>, Sekhar Nori <nsekhar@...com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH v2] net: ethernet: ti: ale: ensure vlan/mdb deleted when
 no members

On Fri, Nov 29, 2019 at 07:58:09PM +0200, Grygorii Strashko wrote:
> The recently updated ALE APIs cpsw_ale_del_mcast() and
> cpsw_ale_del_vlan_modify() have an issue and will not delete ALE entry even
> if VLAN/mcast group has no more members. Hence fix it here and delete ALE
> entry if !port_mask.
> 
> The issue affected only new cpsw switchdev driver.
> 
> Fixes: e85c14370783 ("net: ethernet: ti: ale: modify vlan/mdb api for switchdev")
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  drivers/net/ethernet/ti/cpsw_ale.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/cpsw_ale.c b/drivers/net/ethernet/ti/cpsw_ale.c
> index 929f3d3354e3..ecdbde539eb7 100644
> --- a/drivers/net/ethernet/ti/cpsw_ale.c
> +++ b/drivers/net/ethernet/ti/cpsw_ale.c
> @@ -384,7 +384,7 @@ int cpsw_ale_del_mcast(struct cpsw_ale *ale, const u8 *addr, int port_mask,
>  		       int flags, u16 vid)
>  {
>  	u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
> -	int mcast_members;
> +	int mcast_members = 0;
>  	int idx;
>  
>  	idx = cpsw_ale_match_addr(ale, addr, (flags & ALE_VLAN) ? vid : 0);
> @@ -397,11 +397,13 @@ int cpsw_ale_del_mcast(struct cpsw_ale *ale, const u8 *addr, int port_mask,
>  		mcast_members = cpsw_ale_get_port_mask(ale_entry,
>  						       ale->port_mask_bits);
>  		mcast_members &= ~port_mask;
> +	}
> +
> +	if (mcast_members)
>  		cpsw_ale_set_port_mask(ale_entry, mcast_members,
>  				       ale->port_mask_bits);
> -	} else {
> +	else
>  		cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
> -	}
>  
>  	cpsw_ale_write(ale, idx, ale_entry);
>  	return 0;
> @@ -478,6 +480,10 @@ static void cpsw_ale_del_vlan_modify(struct cpsw_ale *ale, u32 *ale_entry,
>  	members = cpsw_ale_get_vlan_member_list(ale_entry,
>  						ale->vlan_field_bits);
>  	members &= ~port_mask;
> +	if (!members) {
> +		cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_FREE);
> +		return;
> +	}
>  
>  	untag = cpsw_ale_get_vlan_untag_force(ale_entry,
>  					      ale->vlan_field_bits);
> -- 
> 2.17.1
> 

Acked-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>