netdev - Re: [PATCH net-next v3 1/2] net: dsa: untag the bridge pvid from rx skbs

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Date:   Wed, 23 Sep 2020 15:59:46 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "olteanv@...il.com" <olteanv@...il.com>,
        "nikolay@...dia.com" <nikolay@...dia.com>
Subject: Re: [PATCH net-next v3 1/2] net: dsa: untag the bridge pvid from rx
 skbs

On 9/23/20 3:58 PM, Vladimir Oltean wrote:
> On Wed, Sep 23, 2020 at 03:54:59PM -0700, Florian Fainelli wrote:
>> Not having much luck with using  __vlan_find_dev_deep_rcu() for a reason
>> I don't understand we trip over the proto value being neither of the two
>> support Ethertype and hit the BUG().
>>
>> +       upper_dev = __vlan_find_dev_deep_rcu(br, htons(proto), vid);
>> +       if (upper_dev)
>> +               return skb;
>>
>> Any ideas?
> 
> Damn...
> Yes, of course, the skb->protocol is still ETH_P_XDSA which is where
> eth_type_trans() on the master left it.

proto was obtained from br_vlan_get_proto() a few lines above, and
br_vlan_get_proto() just returns br->vlan_proto which defaults to
htons(ETH_P_8021Q) from br_vlan_init().

This is not skb->protocol that we are looking at AFAICT.
-- 
Florian