netdev - [PATCH net 04/15] docs: net: dsa: add more info about the other arguments to get_tag

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Message-Id: <20220716185344.1212091-5-vladimir.oltean@nxp.com>
Date:   Sat, 16 Jul 2022 21:53:33 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net 04/15] docs: net: dsa: add more info about the other arguments to get_tag_protocol

Changes were made to the prototype of get_tag_protocol without
describing at a high level what they are about. Update the documentation
to explain that.

Fixes: 5ed4e3eb0217 ("net: dsa: Pass a port to get_tag_protocol()")
Fixes: 4d776482ecc6 ("net: dsa: Get information about stacked DSA protocol")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 Documentation/networking/dsa/dsa.rst | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/networking/dsa/dsa.rst b/Documentation/networking/dsa/dsa.rst
index f49996e97363..76b0bc1abbae 100644
--- a/Documentation/networking/dsa/dsa.rst
+++ b/Documentation/networking/dsa/dsa.rst
@@ -594,7 +594,11 @@ Switch configuration
 --------------------
 
 - ``get_tag_protocol``: this is to indicate what kind of tagging protocol is
-  supported, should be a valid value from the ``dsa_tag_protocol`` enum
+  supported, should be a valid value from the ``dsa_tag_protocol`` enum.
+  The returned information does not have to be static; the driver is passed the
+  CPU port number, as well as the tagging protocol of a possibly stacked
+  upstream switch, in case there are hardware limitations in terms of supported
+  tag formats.
 
 - ``setup``: setup function for the switch, this function is responsible for setting
   up the ``dsa_switch_ops`` private structure with all it needs: register maps,
-- 
2.34.1