netdev - Re: [net-next 2/6] net: wwan: t7xx: Driver registers with Devlink framework

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Date: Mon,  7 Aug 2023 20:44:00 +0800
From: Jinjian Song <songjinjian@...mail.com>
To: jiri@...nulli.us
Cc: chandrashekar.devegowda@...el.com,
	chiranjeevi.rapolu@...ux.intel.com,
	danielwinkler@...gle.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	haijun.liu@...iatek.com,
	ilpo.jarvinen@...ux.intel.com,
	jesse.brandeburg@...el.com,
	jinjian.song@...ocom.com,
	johannes@...solutions.net,
	kuba@...nel.org,
	linuxwwan@...el.com,
	linuxwwan_5g@...el.com,
	loic.poulain@...aro.org,
	m.chetan.kumar@...ux.intel.com,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	ricardo.martinez@...ux.intel.com,
	ryazanov.s.a@...il.com,
	songjinjian@...mail.com,
	soumya.prakash.mishra@...el.com
Subject: Re: [net-next 2/6] net: wwan: t7xx: Driver registers with Devlink framework

Sat, Aug 05, 2023 at 02:12:13PM CEST, songjinjian@...mail.com wrote:
>>Thu, Aug 03, 2023 at 04:18:08AM CEST, songjinjian@...mail.com wrote:
>>
>>[...]
>>
>>>>+static const struct devlink_param t7xx_devlink_params[] = {
>>>>+	DEVLINK_PARAM_DRIVER(T7XX_DEVLINK_PARAM_ID_FASTBOOT,
>>>>+			     "fastboot", DEVLINK_PARAM_TYPE_BOOL,
>>>>+			     BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
>>>>+			     NULL, NULL, NULL),
>>>
>>>driver init params is there so the user could configure driver instance
>>>and then hit devlink reload in order to reinitialize with the new param
>>>values. In your case, it is a device command. Does not make any sense to
>>>have it as param.
>>>
>>>NAK
>>
>>Thanks for your review, so drop this param and set this param insider driver when driver_reinit,
>>is that fine?
>
>I don't understand the question, sorry.

Thanks for your review, I mean if I don't define fastboot param like devlink_param above, I will
define a global bool variable in driver, then when devlink ... driver_reinit, set this variable to true.

like:
   t7xx_devlink { 
       ....
       bool reset_to_fastboot;
   }


   t7xx_devlink_reload_down () {
       ...
       case DEVLINK_RELOAD_ACTION_DRIVER_REINIT:
           t7xx_devlink.reset_to_fastboot = true;
       ...
   }

   other functions use this variable:

   if (t7xx_devlink.reset_to_fastboot) {
        iowrite(reg, "reset to fastboot");
   }

Intel colleague has change to the way of devlink_param, so I hope to keep this.

>