netdev - Re: DSA switch

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Date:   Fri, 4 May 2018 10:26:54 +0300
From:   Ran Shalit <ranshalit@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: DSA switch

On Fri, May 4, 2018 at 9:59 AM, Ran Shalit <ranshalit@...il.com> wrote:
> On Fri, May 4, 2018 at 12:05 AM, Andrew Lunn <andrew@...n.ch> wrote:
>>> I am using kernel 2.6.37, but I think it is not kernel issue, but more
>>> bad patches done on kernel.
>>> It is based on TI's kernel, but with some custom modifications on
>>> driver's switch, to make it work with TI's cpsw switch.
>>> Seems like someone made some bad patch, I'll continue investigating it.
>>> You can ignore the question...
>>>
>>> Many thanks a lot for the help,
>>> Ran
>>
>> There is no DSA driver for the cpsw. Are you just using the cpsw to
>> pass frames to a switch which is supported by DSA?
>>
>> In theory, mainline CPSW should just work for passing frames to an
>> external switch. So why not just use mainline?
>>
>
> It seems that the bridge functions OK,
> so I rather keep on working with it, instead of doing too many
> dramatically changes in the custom kernel of TI's which works with our
> chip (dm8148).
>
> Yet, I would like to ask about the bridge:
> Can a bridge also be used with dsa switch when ports are connected to
> different subnets ?
>
> Regards,
> Ran



I also see that there is no bridge function in /drivers/net/dsa files
in our kernel (2.6.37)
I can't find any reference to *bridge* or function used in bridge patch:
https://patchwork.ozlabs.org/patch/16578/

So, how is it that bridge worked in my system ?
Does it mean that it actually does the bridging not in the switch but
in the kernel ip stack ?

Thank you,
ran