netdev - Re: [patch net-next v2 05/12] mlxsw: core_linecards: Expose HW revision and INI version

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Date:   Wed, 20 Jul 2022 15:43:17 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        petrm@...dia.com, pabeni@...hat.com, edumazet@...gle.com,
        mlxsw@...dia.com, saeedm@...dia.com, snelson@...sando.io
Subject: Re: [patch net-next v2 05/12] mlxsw: core_linecards: Expose HW
 revision and INI version

On Wed, Jul 20, 2022 at 02:27:40PM +0200, Jiri Pirko wrote:
> Wed, Jul 20, 2022 at 10:56:35AM CEST, idosch@...dia.com wrote:
> >On Tue, Jul 19, 2022 at 08:48:40AM +0200, Jiri Pirko wrote:
> >> +int mlxsw_linecard_devlink_info_get(struct mlxsw_linecard *linecard,
> >> +				    struct devlink_info_req *req,
> >> +				    struct netlink_ext_ack *extack)
> >> +{
> >> +	char buf[32];
> >> +	int err;
> >> +
> >> +	mutex_lock(&linecard->lock);
> >> +	if (WARN_ON(!linecard->provisioned)) {
> >> +		err = 0;
> >
> >Why not:
> >
> >err = -EINVAL;
> >
> >?
> 
> Well, a) this should not happen. No need to push error to the user for
> this as the rest of the info message is still fine.

Not sure what you mean by "the rest of the info message is still fine".
Which info message? If the line card is not provisioned, then it
shouldn't even have a devlink instance and it will not appear in
"devlink dev info" dump.

I still do not understand why this error is severe enough to print a
WARNING to the kernel log, but not emit an error code to user space.

> 
> 
> >
> >> +		goto unlock;
> >> +	}
> >> +
> >> +	sprintf(buf, "%d", linecard->hw_revision);
> >> +	err = devlink_info_version_fixed_put(req, "hw.revision", buf);
> >> +	if (err)
> >> +		goto unlock;
> >> +
> >> +	sprintf(buf, "%d", linecard->ini_version);
> >> +	err = devlink_info_version_running_put(req, "ini.version", buf);
> >> +	if (err)
> >> +		goto unlock;
> >> +
> >> +unlock:
> >> +	mutex_unlock(&linecard->lock);
> >> +	return err;
> >> +}
> >> +
> >>  static int
> >>  mlxsw_linecard_provision_set(struct mlxsw_linecard *linecard, u8 card_type,
> >>  			     u16 hw_revision, u16 ini_version)
> >> -- 
> >> 2.35.3
> >>