netdev - Re: cascaded switch

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Message-ID: <CAJ2oMhLSLXNE4L8UfiG_a+C1n6u_yKvUcAm4NQfrJLuBTkpSxg@mail.gmail.com>
Date:   Fri, 18 May 2018 23:10:12 +0300
From:   Ran Shalit <ranshalit@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: cascaded switch

On Fri, May 18, 2018 at 10:13 PM, Andrew Lunn <andrew@...n.ch> wrote:
> On Fri, May 18, 2018 at 09:35:38PM +0300, Ran Shalit wrote:
>> Hello,
>>
>> I am trying to understand the concept of cascaded switch.
>> I haven't find much information on this topic.
>>
>> Can anyone please explain the general concept, when is it used, and
>> why does the device tree need to know about cascaded switch ?
>
> Hi Ran
>
> I think you first need to define what you mean by cascaded switches.
>
Hi,

I mean the same terminology used in marvell's switch.(I don't think
there is more than one terminology for this, please correct me if
wrong).
Anyway, I can see examples how it is done, but I don't understand the
benefit of this constellation, and why device tree needs to be
familiar with it.

<   switch 1  >---port10--------port10- <  switch 2 >
 | ....|         |                                             | ....|    |
port 1-9     |                                      port 1-9     |
                 |                                                        |
                 |                                                        |
<cpu>--mdio----------------------------------------------

The term "cascaded switches" is also used in dsa documentation in device tree:
https://www.kernel.org/doc/Documentation/networking/dsa/dsa.txt


Regard,
Ranran

>   Andrew