linux-kernel - Re: [PATCH 00/12] staging: dpaa2-ethsw: add support for control interface traffic

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Message-ID: <20191105140256.GB7189@lunn.ch>
Date:   Tue, 5 Nov 2019 15:02:56 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Ioana Ciornei <ioana.ciornei@....com>,
        linux-kernel@...r.kernel.org, f.fainelli@...il.com
Subject: Re: [PATCH 00/12] staging: dpaa2-ethsw: add support for control
 interface traffic

On Tue, Nov 05, 2019 at 02:24:35PM +0100, Greg KH wrote:
> On Tue, Nov 05, 2019 at 02:34:23PM +0200, Ioana Ciornei wrote:
> > This patch set adds support for Rx/Tx capabilities on switch port interfaces.
> > Also, control traffic is redirected through ACLs to the CPU in order to
> > enable proper STP protocol handling.

> I thought I asked for no new features until this code gets out of
> staging?  Only then can you add new stuff.  Please work to make that
> happen first.

Hi Greg

This is in response to my review of the code in staging. The current
code is missing a core feature for an Ethernet switch driver, being
able to send/receive frames from the host. At the moment it can only
control the hardware for how it switches Ethernet frames coming
into/going out of external ports.

One of the core ideas behind how linux handles Ethernet switches is
that they are just a bunch of network interfaces. And currently, these
network interfaces cannot send/receive. We would never move an
Ethernet driver out of staging which cannot send/receive, so i don't
see why we should move an Ethernet switch driver out of staging which
also cannot send/receive.

Maybe this patchset could be minimised. The STP handling is just nice
to have, and could wait until the driver has moved into the main tree.

   Andrew