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

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Date:   Thu, 14 Jun 2018 13:39:58 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     netdev@...r.kernel.org, grygorii.strashko@...com,
        ivan.khoronzhuk@...aro.org, nsekhar@...com, ivecera@...hat.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

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?