netdev - Re: [PATCH net-next 7/9] devlink: allow registering parameters after the instance

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Date:   Mon, 9 Jan 2023 16:21:18 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...nulli.us>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <edumazet@...gle.com>, <pabeni@...hat.com>
Subject: Re: [PATCH net-next 7/9] devlink: allow registering parameters after
 the instance



On 1/6/2023 1:22 PM, Jakub Kicinski wrote:
> On Fri, 6 Jan 2023 13:55:53 +0100 Jiri Pirko wrote:
>>> @@ -5263,7 +5263,13 @@ static void devlink_param_notify(struct devlink *devlink,
>>> 	WARN_ON(cmd != DEVLINK_CMD_PARAM_NEW && cmd != DEVLINK_CMD_PARAM_DEL &&
>>> 		cmd != DEVLINK_CMD_PORT_PARAM_NEW &&
>>> 		cmd != DEVLINK_CMD_PORT_PARAM_DEL);
>>> -	ASSERT_DEVLINK_REGISTERED(devlink);
>>> +
>>> +	/* devlink_notify_register() / devlink_notify_unregister()
>>> +	 * will replay the notifications if the params are added/removed
>>> +	 * outside of the lifetime of the instance.
>>> +	 */
>>> +	if (!devl_is_registered(devlink))
>>> +		return;  
>>
>> This helper would be nice to use on other places as well.
>> Like devlink_trap_group_notify(), devlink_trap_notify() and others. I
>> will take care of that in a follow-up.
> 
> Alternatively we could reorder back to registering sub-objects
> after the instance and not have to worry about re-sending 
> notifications :S

I did find it convenient to be able to do both pre and post-registering,
but of the two I'd definitely prefer doing it post-registering, as that
makes it easier to handle/allow more dynamic sub-objects.