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Message-Id: <20200512.180306.1060369920104837686.davem@redhat.com>
Date: Tue, 12 May 2020 18:03:06 -0700 (PDT)
From: David Miller <davem@...hat.com>
To: olteanv@...il.com
Cc: andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
kuba@...nel.org, eric.dumazet@...il.com, jiri@...lanox.com,
idosch@...sch.org, rmk+kernel@...linux.org.uk,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: dsa: sja1105: disable rxvlan offload for
the DSA master
From: Vladimir Oltean <olteanv@...il.com>
Date: Wed, 13 May 2020 02:49:21 +0300
> From: Vladimir Oltean <vladimir.oltean@....com>
>
> On sja1105 operating in best_effort_vlan_filtering mode (when the TPID
> of the DSA tags is 0x8100), it can be seen that __netif_receive_skb_core
> calls __vlan_hwaccel_clear_tag right before passing the skb to the DSA
> packet_type handler.
>
> This means that the tagger does not see the VLAN tag in the skb, nor in
> the skb meta data.
>
> The patch that started zeroing the skb VLAN tag is:
>
> commit d4b812dea4a236f729526facf97df1a9d18e191c
> Author: Eric Dumazet <edumazet@...xxxxxxx>
> Date: Thu Jul 18 07:19:26 2013 -0700
>
> vlan: mask vlan prio bits
Eric, please review.
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