linux-kernel - Re: [PATCH net-next 0/5] net: ipqess: introduce Qualcomm IPQESS driver

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Date:   Fri, 22 Apr 2022 22:29:38 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc:     davem@...emloft.net, Rob Herring <robh+dt@...nel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, thomas.petazzoni@...tlin.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next 0/5] net: ipqess: introduce Qualcomm IPQESS
 driver

On Fri, Apr 22, 2022 at 08:03:00PM +0200, Maxime Chevallier wrote:
> Hello everyone,
> 
> This series introduces a new driver, for the Qualcomm IPQESS Ethernet
> Controller, found on the IPQ4019.
> 
> The driver itself is pretty straightforward, but has lived out-of-tree
> for a while. I've done my best to clean-up some outdated API calls, but
> some might remain.
> 
> This controller is somewhat special, since it's part of the IPQ4019 SoC
> which also includes an QCA8K switch, and uses the IPQESS controller for
> the CPU port.

Does it exist in a form where it is not connected to a switch?

As Florian has suggested, if we assume frames are always going
to/coming from a switch, we can play around with the frame format a
little. A dummy tag could be added to the head or tail of the frame,
which the MAC driver then uses. That gives us a more normal structure.

      Andrew