netdev - Re: [PATCH net-next 2/4] net: dsa: Link aggregation support

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Message-ID: <20201128163805.GB2191767@lunn.ch>
Date:   Sat, 28 Nov 2020 17:38:05 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Tobias Waldekranz <tobias@...dekranz.com>, davem@...emloft.net,
        kuba@...nel.org, vivien.didelot@...il.com, olteanv@...il.com,
        j.vosburgh@...il.com, vfalico@...il.com, andy@...yhouse.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/4] net: dsa: Link aggregation support

> > OK I think I finally see what you are saying. Sorry it took me this
> > long. I do not mean to be difficult, I just want to understand.

Not a problem. This is a bit different to normal, the complexity of
the stack means you need to handle this different to most drivers. If
you have done any deeply embedded stuff, RTOS, allocating everything
up front is normal, it eliminates a whole class of problems.

> > 
> > How about this:
> > 
> > - Add a `lags_max` field to `struct dsa_switch` to let each driver
> >   define the maximum number supported by the hardware.

This is all reasonable. I just wonder what that number is for the
mv88e6xx case, especially for D in DSA. I guess LAGs are global in
scope across a set of switches. So it does not matter if there is one
switch or lots of switches, the lags_max stays the same.

      Andrew