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

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Message-ID: <20200923225802.vjwwjmw7mh2ru3so@skbuf>
Date:   Wed, 23 Sep 2020 22:58:03 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Florian Fainelli <f.fainelli@...il.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 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.