netdev - Re: [PATCH net-next 00/11] mlxsw: extend line card model by devices and info

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Date:   Tue, 26 Apr 2022 16:05:43 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Ido Schimmel <idosch@...sch.org>, Jakub Kicinski <kuba@...nel.org>,
        Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org,
        davem@...emloft.net, pabeni@...hat.com, jiri@...dia.com,
        petrm@...dia.com, dsahern@...il.com, mlxsw@...dia.com
Subject: Re: [PATCH net-next 00/11] mlxsw: extend line card model by devices
 and info

Tue, Apr 26, 2022 at 03:45:48PM CEST, andrew@...n.ch wrote:
>> Well, I got your point. If the HW would be designed in the way the
>> building blocks are exposed to the host, that would work. However, that
>> is not the case here, unfortunatelly.
>
>I'm with Jakub. It is the uAPI which matters here. It should look the
>same for a SoC style enterprise router and your discombobulated TOR
>router. How you talk to the different building blocks is an
>implementation detail.

It's not that simple. Take the gearbox for example. You say bunch of
MDIO registers. ASIC FW has a custom SDK internally that is used to
talk to the gearbox.

The flash, you say expose by MTD, but there is no access to it directly
from host. Can't be done. There are HW design limitations that are
blocking your concept.