netdev - Re: [RFC v2, net-next, PATCH 4/4] net/cpsw_switchdev: add switchdev mode of operation on cpsw driver

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Message-ID: <94f304d1-1136-384d-7e1d-8fc4aeaf70fb@redhat.com>
Date:   Wed, 20 Jun 2018 15:54:23 +0200
From:   Ivan Vecera <ivecera@...hat.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     Jiri Pirko <jiri@...nulli.us>,
        Grygorii Strashko <grygorii.strashko@...com>,
        netdev@...r.kernel.org, ivan.khoronzhuk@...aro.org, nsekhar@...com,
        andrew@...n.ch, f.fainelli@...il.com, francois.ozog@...aro.org,
        yogeshs@...com, spatton@...com, Jose.Abreu@...opsys.com
Subject: Re: [RFC v2, net-next, PATCH 4/4] net/cpsw_switchdev: add switchdev
 mode of operation on cpsw driver

On 20.6.2018 14:59, Ilias Apalodimas wrote:
> On Wed, Jun 20, 2018 at 02:53:47PM +0200, Ivan Vecera wrote:
>> On 20.6.2018 09:08, Jiri Pirko wrote:
>>> Tue, Jun 19, 2018 at 01:19:00AM CEST, grygorii.strashko@...com wrote:
>>>>
>>>>
>>>> On 06/14/2018 06:43 AM, Ilias Apalodimas wrote:
>>>>> On Thu, Jun 14, 2018 at 01:39:58PM +0200, Jiri Pirko wrote:
>>>>>> Thu, Jun 14, 2018 at 01:34:04PM CEST, ilias.apalodimas@...aro.org wrote:
>>>>>>> On Thu, Jun 14, 2018 at 01:30:28PM +0200, Jiri Pirko wrote:
>>>>>>>> Thu, Jun 14, 2018 at 01:11:30PM CEST, ilias.apalodimas@...aro.org wrote:
>>>>>>>>
>>>>>>>> [...]
>>>>>>>>
>>>>>>>>> @@ -2711,6 +2789,10 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
>>>>>>>>> 	if (of_property_read_bool(node, "dual_emac"))
>>>>>>>>> 		data->switch_mode = CPSW_DUAL_EMAC;
>>>>>>>>>
>>>>>>>>> +	/* switchdev overrides DTS */
>>>>>>>>> +	if (IS_ENABLED(CONFIG_TI_CPSW_SWITCHDEV))
>>>>>>>>> +		data->switch_mode = CPSW_SWITCHDEV;
>>>>>>>>
>>>>>>>> So you force CPSW_SWITCHDEV mode if the CONFIG_TI_CPSW_SWITCHDEV is
>>>>>>>> enabled. That does not sound right. I think that user should tell what
>>>>>>>> mode does he want regardless what the kernel config is.
>>>>>>> We discussed this during the V1 of the RFC. Yes it doesn't seem good, but the
>>>>>>> device currently configures the modes using DTS (which is not correct). I choose
>>>>>>> the .config due to that. I can't think of anything better, but i am open to
>>>>>>> suggestions
>>>>>>
>>>>>> Agreed that DTS does fit as well. I think that this might be a job for
>>>>>> devlink parameters (patchset is going to be sent upstream next week).
>>>>>> You do have 1 bus address for the whole device (both ports), right?
>>>>>>
>>>>> Yes devlink sounds reasonable. I thyink there's only one bus for it, but then
>>>>> again i am far from an expert on the hardware interrnals. Grygorii can correct
>>>>> me if i am wrong.
>>>>
>>>> Devlink and NFS boot are not compatible as per my understanding, so .. 
>>>
>>> ? Why do you say so?
>>
>> Why aren't they compatible?? You can have devlink binary in initramfs and
>> configure the ASIC and ports via devlink batch file - prior mounting NFS root.
> This is doable but, are we taking into consideration device reconfiguration 
> (which was the reason for creating the minimal filesystem) or are we just 
> talking about device booting/initial config?
Devlink calls should be placed in setup.sh

I.