netdev - Re: [PATCH net-next V3 4/8] devlink: Expose port function commands to control RoCE

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Date:   Tue, 6 Dec 2022 09:52:59 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Shannon Nelson <shnelson@....com>, Shay Drory <shayd@...dia.com>,
        netdev@...r.kernel.org, davem@...emloft.net, danielj@...dia.com,
        yishaih@...dia.com, jiri@...dia.com, saeedm@...dia.com,
        parav@...dia.com
Subject: Re: [PATCH net-next V3 4/8] devlink: Expose port function commands
 to control RoCE

Tue, Dec 06, 2022 at 03:02:34AM CET, kuba@...nel.org wrote:
>On Mon, 5 Dec 2022 15:37:26 -0800 Shannon Nelson wrote:
>> >   enum devlink_port_function_attr {
>> >          DEVLINK_PORT_FUNCTION_ATTR_UNSPEC,
>> >          DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR,     /* binary */
>> >          DEVLINK_PORT_FN_ATTR_STATE,     /* u8 */
>> >          DEVLINK_PORT_FN_ATTR_OPSTATE,   /* u8 */
>> > +       DEVLINK_PORT_FN_ATTR_CAPS,      /* bitfield32 */  
>> 
>> Will 32 bits be enough, or should we start off with u64?  It will 
>> probably be fine, but since we're setting a uapi thing here we probably 
>> want to be sure we won't need to change it in the future.
>
>Ah, if only variable size integer types from Olek were ready :(

Or, if the bitfield was variable length from the beginning (as I asked
for :)).


>
>Unfortunately there is no bf64 today, so we'd either have to add soon
>to be deprecated bf64 or hold off waiting for Olek...
>I reckon the dumb thing of merging bf32 may be the best choice right
>now :(

+1