linux-kernel - Re: [PATCH devicetree] arm64: dts: ls1028a: mark internal links between Felix and ENETC as capable of flow control

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Message-ID: <20211005060126.GR20743@dragon>
Date:   Tue, 5 Oct 2021 14:01:27 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, Li Yang <leoyang.li@....com>
Subject: Re: [PATCH devicetree] arm64: dts: ls1028a: mark internal links
 between Felix and ENETC as capable of flow control

On Wed, Sep 29, 2021 at 02:52:26PM +0300, Vladimir Oltean wrote:
> The internal Ethernet switch suffers from erratum A-050484 ("Ethernet
> flow control not functional on L2 switch NPI port when XFH is used").
> XFH stands for "Extraction Frame Header" - which basically means the
> default "ocelot" DSA tagging protocol.
> 
> However, the switch supports one other tagging protocol - "ocelot-8021q",
> and this is not subject to the erratum above. So describe the hardware
> ability to pass PAUSE frames in the device tree, and let the driver
> figure out whether it should use flow control on the CPU port or not,
> depending on whether the "ocelot" or "ocelot-8021q" tagging protocol is
> being used.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Applied, thanks!