linux-kernel - RE: [PATCH 5/6] staging: fsl-dpaa2/ethsw: Add README

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Date:   Tue, 3 Oct 2017 10:07:41 +0000
From:   Razvan Stefanescu <razvan.stefanescu@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "Ruxandra Ioana Radulescu" <ruxandra.radulescu@....com>,
        "arnd@...db.de" <arnd@...db.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "Alexandru Marginean" <alexandru.marginean@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "agraf@...e.de" <agraf@...e.de>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Bogdan Purcareata <bogdan.purcareata@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: RE: [PATCH 5/6] staging: fsl-dpaa2/ethsw: Add README

> -----Original Message-----
> From: linux-arm-kernel [mailto:linux-arm-kernel-bounces@...ts.infradead.org]
> On Behalf Of Andrew Lunn
> Sent: Tuesday, September 19, 2017 3:18 PM
> To: Razvan Stefanescu <razvan.stefanescu@....com>
> Cc: devel@...verdev.osuosl.org; Ruxandra Ioana Radulescu
> <ruxandra.radulescu@....com>; arnd@...db.de; gregkh@...uxfoundation.org;
> Alexandru Marginean <alexandru.marginean@....com>; linux-
> kernel@...r.kernel.org; agraf@...e.de; stuyoder@...il.com; Bogdan
> Purcareata <bogdan.purcareata@....com>; linux-arm-
> kernel@...ts.infradead.org; Laurentiu Tudor <laurentiu.tudor@....com>
> Subject: Re: [PATCH 5/6] staging: fsl-dpaa2/ethsw: Add README
> 
> On Tue, Sep 19, 2017 at 12:01:37PM +0300, Razvan Stefanescu wrote:
> > +Driver uses the switch device driver model and exposes each switch port as
> > +a network interface, which can be included in a bridge. Traffic switched
> > +between ports is offloaded into the hardware. Exposed network interfaces
> > +are not used for I/O, they are used just for configuration. This
> > +limitation is going to be addressed in the future.
> 
> Hi Razvan
> 
> Could you briefly describe how Ethernet frames get from the CPU to the
> switch. This is what decided if you should write a plain switchdev
> driver, or a DSA driver.
> 
> 	Andrew
> 
Hello Andrew,

CPU frame handling will be added in a later. Each netdevice associated 
to a switch port will have I/O capabilities like dpaa2-ethernet devices.
The dpaa2-ethsw will use ACLs to redirect specific types of frames
(i.e BPDUs) to CPU.

Best regards,
Razvan S.