netdev - Re: [net-next PATCH v3 3/4] octeontx2-pf: ethtool: Implement get_fec

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Date:   Sun, 4 Dec 2022 14:00:48 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Hariprasad Kelam <hkelam@...vell.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com,
        edumazet@...gle.com, sgoutham@...vell.com, lcherian@...vell.com,
        gakula@...vell.com, jerinj@...vell.com, sbhatta@...vell.com
Subject: Re: [net-next PATCH v3 3/4] octeontx2-pf: ethtool: Implement
 get_fec_stats

On Thu, Dec 01, 2022 at 11:30:39PM +0530, Hariprasad Kelam wrote:
> This patch registers a callback for get_fec_stats such that
> FEC stats can be queried from the below command
> 
> "ethtool -I --show-fec eth0"
> 
> Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> ---
> v3 * Dont remove existing FEC stats support over
>      ethtool statistics (ethtool -S)
> 
>  .../marvell/octeontx2/nic/otx2_ethtool.c      | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
> index 0eb74e8c553d..85f46e15ac03 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
> @@ -1268,6 +1268,45 @@ static int otx2_set_link_ksettings(struct net_device *netdev,
>  	return err;
>  }
> 
> +static void otx2_get_fec_stats(struct net_device *netdev,
> +			       struct ethtool_fec_stats *fec_stats)
> +{
> +	struct otx2_nic *pfvf = netdev_priv(netdev);
> +	struct cgx_fw_data *rsp;
> +
> +	otx2_update_lmac_fec_stats(pfvf);
> +
> +	rsp = otx2_get_fwdata(pfvf);
> +	if (!IS_ERR(rsp) && rsp->fwdata.phy.misc.has_fec_stats &&

<...>

> +	} else {

I see that you copied this pattern of call to otx2_get_fwdata() and check
for error from another place. However, that function returns an error
while executing call to HW. I don't know if it is correct thing to
continue as nothing happened.

> +		/* Report MAC FEC stats */
> +		fec_stats->corrected_blocks.total     =
> +			pfvf->hw.cgx_fec_corr_blks;
> +		fec_stats->uncorrectable_blocks.total =
> +			pfvf->hw.cgx_fec_uncorr_blks;

Please don't do vertical alignment of new code. Please use clang formatter
to fix it.

> +	}
> +}
> +
>  static const struct ethtool_ops otx2_ethtool_ops = {
>  	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
>  				     ETHTOOL_COALESCE_MAX_FRAMES |
> @@ -1298,6 +1337,7 @@ static const struct ethtool_ops otx2_ethtool_ops = {
>  	.get_pauseparam		= otx2_get_pauseparam,
>  	.set_pauseparam		= otx2_set_pauseparam,
>  	.get_ts_info		= otx2_get_ts_info,
> +	.get_fec_stats		= otx2_get_fec_stats,
>  	.get_fecparam		= otx2_get_fecparam,
>  	.set_fecparam		= otx2_set_fecparam,
>  	.get_link_ksettings     = otx2_get_link_ksettings,
> --
> 2.17.1