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

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Date: Mon, 7 Aug 2023 14:58:31 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jinjian Song <songjinjian@...mail.com>
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, soumya.prakash.mishra@...el.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.


>
>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.
>
>>