linux-kernel - Re: [PATCH net-next v2] net: dsa: Support bridge 802.1Q while untagging

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Message-ID: <20201001233628.amqctjli7wblq2rk@skbuf>
Date:   Thu, 1 Oct 2020 23:36:28 +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>
Subject: Re: [PATCH net-next v2] net: dsa: Support bridge 802.1Q while
 untagging

On Fri, Oct 02, 2020 at 02:24:02AM +0300, Vladimir Oltean wrote:
> The explanation is super confusing, although I think the placement of
> the "skb->vlan_proto = vlan_dev_vlan_proto(upper_dev)" is correct.

No, I think it _is_ wrong, after all, I think you're repairing
skb->vlan_proto only for that particular 8021q upper, but not for the
rest. I think the correct approach would be to say "skb->protocol =
hdr->h_vlan_proto" right before calling skb_vlan_untag().