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

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Date:   Thu, 13 Apr 2023 16:17:26 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc:     jiri@...nulli.us, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, corbet@....net,
        jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        richardcochran@...il.com, netdev@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org
Subject: Re: [RFC PATCH v1] ice: add CGU info to devlink info callback

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