linux-kernel - RE: [PATCH RFC] Update documentation for KSZ DSA drivers so that new drivers can be added

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Date:   Fri, 8 Sep 2017 19:48:46 +0000
From:   <Tristram.Ha@...rochip.com>
To:     <muvarov@...il.com>
CC:     <andrew@...n.ch>, <pavel@....cz>, <nathan.leigh.conrad@...il.com>,
        <vivien.didelot@...oirfairelinux.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <Woojung.Huh@...rochip.com>,
        <f.fainelli@...il.com>
Subject: RE: [PATCH RFC] Update documentation for KSZ DSA drivers so that
 new drivers can be added

> -----Original Message-----
> From: Maxim Uvarov [mailto:muvarov@...il.com]
> Sent: Friday, September 08, 2017 12:00 PM
> To: Florian Fainelli
> Cc: Tristram Ha - C24268; Andrew Lunn; Pavel Machek; Nathan Conrad; Vivien
> Didelot; netdev; linux-kernel@...r.kernel.org; Woojung Huh - C21699
> Subject: Re: [PATCH RFC] Update documentation for KSZ DSA drivers so that new
> drivers can be added
> 
> 2017-09-08 21:48 GMT+03:00 Florian Fainelli <f.fainelli@...il.com>:
> > On 09/07/2017 02:11 PM, Tristram.Ha@...rochip.com wrote:
> >> From: Tristram Ha <Tristram.Ha@...rochip.com>
> >>
> >> Add other KSZ switches support so that patch check does not complain.
> >>
> >> Signed-off-by: Tristram Ha <Tristram.Ha@...rochip.com>
> >> ---
> >>  Documentation/devicetree/bindings/net/dsa/ksz.txt | 117
> >> ++++++++++++----------
> >>  1 file changed, 62 insertions(+), 55 deletions(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/net/dsa/ksz.txt
> >> b/Documentation/devicetree/bindings/net/dsa/ksz.txt
> >> index 0ab8b39..34af0e0 100644
> >> --- a/Documentation/devicetree/bindings/net/dsa/ksz.txt
> >> +++ b/Documentation/devicetree/bindings/net/dsa/ksz.txt
> >> @@ -3,8 +3,15 @@ Microchip KSZ Series Ethernet switches
> >>
> >>  Required properties:
> >>
> >> -- compatible: For external switch chips, compatible string must be
> >> exactly one
> >> -  of: "microchip,ksz9477"
> >> +- compatible: Should be "microchip,ksz9477" for KSZ9477 chip,
> >> +           "microchip,ksz8795" for KSZ8795 chip,
> >> +           "microchip,ksz8794" for KSZ8794 chip,
> >> +           "microchip,ksz8765" for KSZ8765 chip,
> >> +           "microchip,ksz8895" for KSZ8895 chip,
> >> +           "microchip,ksz8864" for KSZ8864 chip,
> >> +           "microchip,ksz8873" for KSZ8873 chip,
> >> +           "microchip,ksz8863" for KSZ8863 chip,
> >> +           "microchip,ksz8463" for KSZ8463 chip
> >
> 
> 
> Tristram, does any of this devices support chaining?
> 
> Maxim.

They do not if you mean daisy-chaining the switches together.

There is always a problem that once tail tagging mode is enabled
sending a frame through the MAC without going through the DSA
layer will cause the frame to be dropped.