netdev - Re: [PATCH v5 net-next 09/10] net: dsa: add a second tagger for Ocelot switches based on tag

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Date:   Wed, 20 Jan 2021 20:05:10 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Hongbo Wang <hongbo.wang@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Po Liu <po.liu@....com>, Yangbo Lu <yangbo.lu@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Eldar Gasanov <eldargasanov2@...il.com>,
        Andrey L <al@...omtech.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v5 net-next 09/10] net: dsa: add a second tagger for
 Ocelot switches based on tag_8021q



On 1/20/2021 6:36 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> There are use cases for which the existing tagger, based on the NPI
> (Node Processor Interface) functionality, is insufficient.
> 
> Namely:
> - Frames injected through the NPI port bypass the frame analyzer, so no
>   source address learning is performed, no TSN stream classification,
>   etc.
> - Flow control is not functional over an NPI port (PAUSE frames are
>   encapsulated in the same Extraction Frame Header as all other frames)
> - There can be at most one NPI port configured for an Ocelot switch. But
>   in NXP LS1028A and T1040 there are two Ethernet CPU ports. The non-NPI
>   port is currently either disabled, or operated as a plain user port
>   (albeit an internally-facing one). Having the ability to configure the
>   two CPU ports symmetrically could pave the way for e.g. creating a LAG
>   between them, to increase bandwidth seamlessly for the system.
> 
> So there is a desire to have an alternative to the NPI mode. This change
> keeps the default tagger for the Seville and Felix switches as "ocelot",
> but it can be changed via the following device attribute:
> 
> echo ocelot-8021q > /sys/class/<dsa-master>/dsa/tagging
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

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