linux-kernel - Re: [PATCH net-next 03/16] devlink: Add devlink reload limit option

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Message-ID: <20201005121813.GA6617@nanopsycho>
Date:   Mon, 5 Oct 2020 14:18:13 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Moshe Shemesh <moshe@...dia.com>
Cc:     Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...dia.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 03/16] devlink: Add devlink reload limit option

Sun, Oct 04, 2020 at 08:42:47AM CEST, moshe@...dia.com wrote:
>
>On 10/3/2020 10:51 AM, Jiri Pirko wrote:
>> Thu, Oct 01, 2020 at 03:59:06PM CEST, moshe@...lanox.com wrote:
>> 
>> [...]
>> 
>> > enum devlink_attr {
>> > 	/* don't change the order or add anything between, this is ABI! */
>> > 	DEVLINK_ATTR_UNSPEC,
>> > @@ -507,6 +524,7 @@ enum devlink_attr {
>> > 
>> > 	DEVLINK_ATTR_RELOAD_ACTION,		/* u8 */
>> > 	DEVLINK_ATTR_RELOAD_ACTIONS_PERFORMED,	/* u64 */
>> > +	DEVLINK_ATTR_RELOAD_LIMIT,	/* u8 */
>> Hmm, why there could be specified only single "limit"? I believe this
>> should be a bitfield. Same for the internal api to the driver.
>
>
>Why bitfield ? Either the user asks for a specific limit or he doesn't ask
>for any (unspecified).

He can ask for multiple limits: No_link_flag , no_something_else. Could
be totally unrelated limitations. Let's just have the UAPI ready for
this once we define it from scratch.


>
>If the user doesn't need limitation he will not specify a limit.
>
>> [...]