netdev - Re: [PATCH net v2] net: dsa: tag_rtl4

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Date:   Tue, 31 Aug 2021 13:55:05 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, DENG Qingfang <dqfext@...il.com>,
        Mauri Sandberg <sandberg@...lfence.com>
Subject: Re: [PATCH net v2] net: dsa: tag_rtl4_a: Fix egress tags



On 8/31/2021 11:50 AM, Linus Walleij wrote:
> I noticed that only port 0 worked on the RTL8366RB since we
> started to use custom tags.
> 
> It turns out that the format of egress custom tags is actually
> different from ingress custom tags. While the lower bits just
> contain the port number in ingress tags, egress tags need to
> indicate destination port by setting the bit for the
> corresponding port.
> 
> It was working on port 0 because port 0 added 0x00 as port
> number in the lower bits, and if you do this the packet appears
> at all ports, including the intended port. Ooops.
> 
> Fix this and all ports work again. Use the define for shifting
> the "type A" into place while we're at it.
> 
> Tested on the D-Link DIR-685 by sending traffic to each of
> the ports in turn. It works.
> 
> Fixes: 86dd9868b878 ("net: dsa: tag_rtl4_a: Support also egress tags")
> Cc: DENG Qingfang <dqfext@...il.com>
> Cc: Mauri Sandberg <sandberg@...lfence.com>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian