linux-kernel - RE: [RFC PATCH v1] ice: add CGU info to devlink info callback

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Message-ID: <DM6PR11MB4657E9390EC16B7BD47AC4979B999@DM6PR11MB4657.namprd11.prod.outlook.com>
Date:   Fri, 14 Apr 2023 10:06:35 +0000
From:   "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     "jiri@...nulli.us" <jiri@...nulli.us>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "corbet@....net" <corbet@....net>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
Subject: RE: [RFC PATCH v1] ice: add CGU info to devlink info callback

>From: Leon Romanovsky <leon@...nel.org>
>Sent: Thursday, April 13, 2023 7:17 PM
>
>On Thu, Apr 13, 2023 at 02:04:33PM +0000, Kubalewski, Arkadiusz wrote:
>> >From: Leon Romanovsky <leon@...nel.org>
>> >Sent: Thursday, April 13, 2023 3:17 PM
>> >
>> >On Wed, Apr 12, 2023 at 03:38:11PM +0200, Arkadiusz Kubalewski wrote:
>> >> If Clock Generation Unit and dplls are present on NIC board user shall
>> >> know its details.
>> >> Provide the devlink info callback with a new:
>> >> - fixed type object `cgu.id` - hardware variant of onboard CGU
>> >> - running type object `fw.cgu` - CGU firmware version
>> >> - running type object `fw.cgu.build` - CGU configuration build version
>> >>
>> >> These information shall be known for debugging purposes.
>> >>
>> >> Test (on NIC board with CGU)
>> >> $ devlink dev info <bus_name>/<dev_name> | grep cgu
>> >>         cgu.id 8032
>> >>         fw.cgu 6021
>> >>         fw.cgu.build 0x1030001
>> >>
>> >> Test (on NIC board without CGU)
>> >> $ devlink dev info <bus_name>/<dev_name> | grep cgu -c
>> >> 0
>> >>
>> >> Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
>> >> ---
>> >>  Documentation/networking/devlink/ice.rst     | 14 +++++++++
>> >>  drivers/net/ethernet/intel/ice/ice_devlink.c | 30
>> >>++++++++++++++++++++
>> >>  drivers/net/ethernet/intel/ice/ice_main.c    |  5 +++-
>> >>  drivers/net/ethernet/intel/ice/ice_ptp_hw.c  | 12 ++++----
>> >>  drivers/net/ethernet/intel/ice/ice_type.h    |  9 +++++-
>> >>  5 files changed, 62 insertions(+), 8 deletions(-)
>> >
>> ><...>
>> >
>> >>  Flash Update
>> >>  ============
>> >> diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c
>> >b/drivers/net/ethernet/intel/ice/ice_devlink.c
>> >> index bc44cc220818..06fe895739af 100644
>> >> --- a/drivers/net/ethernet/intel/ice/ice_devlink.c
>> >> +++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
>> >> @@ -193,6 +193,33 @@ ice_info_pending_netlist_build(struct ice_pf
>> >>__always_unused *pf,
>> >>  		snprintf(ctx->buf, sizeof(ctx->buf), "0x%08x", netlist-hash);
>> >>  }
>> >>
>> >> +static void ice_info_cgu_id(struct ice_pf *pf, struct ice_info_ctx *ctx)
>> >> +{
>> >> +	if (ice_is_feature_supported(pf, ICE_F_CGU)) {
>> >> +		struct ice_hw *hw = &pf->hw;
>> >> +
>> >> +		snprintf(ctx->buf, sizeof(ctx->buf), "%u", hw->cgu.id);
>> >> +	}
>> >
>> >Please use kernel coding style - success oriented flow
>> >
>> >struct ice_hw *hw = &pf->hw;
>> >
>> >if (!ice_is_feature_supported(pf, ICE_F_CGU))
>> >  return;
>> >
>> >snprintf(ctx->buf, sizeof(ctx->buf), "%u", hw->cgu.id);
>> >
>> >
>> >However, it will be nice to have these callbacks only if CGU is
>> >supported, in such way you won't need any of ice_is_feature_supported()
>> >checks.
>> >
>> >Thanks
>>
>> Sure, I will fix as suggested in the next version.
>> Although most important is to achieve common understanding and agreement if
>> This way is the right one. Maybe those devlink id's shall be defined as a
>> part of "include/net/devlink.h", so other vendors could use it?
>
>Once second vendor materialize, it will be his responsibility to move
>common code to devlink.h.
>

Makes sense, thanks for this explanation!
Arkadiusz

>> Also in such case probably naming might need to be unified.
>>
>> Thank you!
>> Arkadiusz