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

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Date: Thu, 10 Aug 2023 23:19:59 +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,
	vsankar@...ovo.com
Subject: Re: [net-next 2/6] net: wwan: t7xx: Driver registers with Devlink framework

>Mon, Aug 07, 2023 at 02:44:00PM CEST, songjinjian@...mail.com wrote:
>>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
>
>Could you not thank me in every reply, please?
>
>
>>define a global bool variable in driver, then when devlink ... driver_reinit, set this variable to true.
>
>That would be very wrong. Driver reinit should just reload the driver,
>recreate the entities created. should not be trigger to change
>behaviour.

Thanks for your review, if so, I hope it is possible to keep the devlink param as above.

>
>>
>>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.
>>
>>>
>