netdev - Re: [PATCH v2 net 4/4] bridge: Fix updating FDB entries when the PVID is applied

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Message-ID: <20131016085715.3442e8c3@nehalam.linuxnetplumber.net>
Date:	Wed, 16 Oct 2013 08:57:15 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Cc:	"David S . Miller" <davem@...emloft.net>,
	Vlad Yasevich <vyasevic@...hat.com>, netdev@...r.kernel.org,
	Toshiaki Makita <toshiaki.makita1@...il.com>
Subject: Re: [PATCH v2 net 4/4] bridge: Fix updating FDB entries when the
 PVID is applied

On Wed, 16 Oct 2013 17:07:16 +0900
Toshiaki Makita <makita.toshiaki@....ntt.co.jp> wrote:

> We currently set the value that variable vid is pointing, which will be
> used in FDB later, to 0 at br_allowed_ingress() when we receive untagged
> or priority-tagged frames, even though the PVID is valid.
> This leads to FDB updates in such a wrong way that they are learned with
> VID 0.
> Update the value to that of PVID if the PVID is applied.
> 
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> Reviewed-by: Vlad Yasevich <vyasevic@...hat.com>
> ---
>  net/bridge/br_vlan.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
> index 5a9c44a..53f0990 100644
> --- a/net/bridge/br_vlan.c
> +++ b/net/bridge/br_vlan.c
> @@ -217,6 +217,7 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
>  		/* PVID is set on this port.  Any untagged or priority-tagged
>  		 * ingress frame is considered to belong to this vlan.
>  		 */
> +		*vid = pvid;
>  		if (likely(err))
>  			/* Untagged Frame. */
>  			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), pvid);


Ok, but side-effects seem like an indication of poor code logic
flow design. Not your fault but part of the the per-vlan filtering code.
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