netdev - Re: [PATCH net-next 0/8] net: ethernet: ti: am65-cpsw: add multi port support in mac-only mode

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Date:   Mon, 5 Oct 2020 13:16:34 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH net-next 0/8] net: ethernet: ti: am65-cpsw: add multi port
 support in mac-only mode



On 03/10/2020 02:07, Jakub Kicinski wrote:
> On Fri, 2 Oct 2020 16:04:21 -0700 Jakub Kicinski wrote:
>> On Fri, 2 Oct 2020 12:56:43 +0300 Grygorii Strashko wrote:
>>> On 02/10/2020 02:08, Jakub Kicinski wrote:
>>>> On Thu, 1 Oct 2020 13:52:50 +0300 Grygorii Strashko wrote:
>>>>> This series adds multi-port support in mac-only mode (multi MAC mode) to TI
>>>>> AM65x CPSW driver in preparation for enabling support for multi-port devices,
>>>>> like Main CPSW0 on K3 J721E SoC or future CPSW3g on K3 AM64x SoC.
>>>>>
>>>>> The multi MAC mode is implemented by configuring every enabled port in "mac-only"
>>>>> mode (all ingress packets are sent only to the Host port and egress packets
>>>>> directed to target Ext. Port) and creating separate net_device for
>>>>> every enabled Ext. port.
>>>>
>>>> Do I get it right that you select the mode based on platform? Can the
>>>> other mode still be supported on these platforms?
>>>>
>>>> Is this a transition to normal DSA mode where ports always have netdevs?
>>>
>>> The idea here is to start in multi mac mode by default, as we still
>>> have pretty high demand for this. Then, and we are working on it, the
>>> switchdev mode is going to be introduces (not DSA). The switch
>>> between modes will happen by using devlink option - the approach is
>>> similar to what was used for Sitara CPSW cpsw_new.c driver [1].
>>
>> What's unclear from the patches is whether the default configuration
>> for already supported platforms will change?
>>
>> All the patches sound like they are "in preparation for support of K3
>> J721E" etc. So this is just code restructuring with no user-visible
>> changes?
> 
> Another way of putting the question perhaps would be - is num_ports
> always 1 for existing platforms?
> 

Yes. Sorry for confusion - all now supported K3 CPSW instances have 1 external port and
these changes should not have affect on them.

-- 
Best regards,
grygorii