netdev - Re: [net V2 07/11] net/mlx5: Verify Hardware supports requested ptp function on a given pin

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Message-ID: <20200728132005.0e9356a3@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 28 Jul 2020 13:20:05 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Ariel Levkovich <lariel@...lanox.com>
Subject: Re: [net V2 07/11] net/mlx5: Verify Hardware supports requested ptp
 function on a given pin

On Tue, 28 Jul 2020 12:59:31 -0700 Saeed Mahameed wrote:
>  static int mlx5_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
>  			   enum ptp_pin_function func, unsigned int chan)
>  {
> -	return (func == PTP_PF_PHYSYNC) ? -EOPNOTSUPP : 0;
> +	struct mlx5_clock *clock = container_of(ptp, struct mlx5_clock,
> +						ptp_info);
> +
> +	switch (func) {
> +	case PTP_PF_NONE:
> +		return 0;
> +	case PTP_PF_EXTTS:
> +		return !(clock->pps_info.pin_caps[pin] &
> +			 MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_IN);
> +	case PTP_PF_PEROUT:
> +		return !(clock->pps_info.pin_caps[pin] &
> +			 MLX5_MTPPS_REG_CAP_PIN_X_MODE_SUPPORT_PPS_OUT);
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	return -EOPNOTSUPP;

nit: entirely unnecessary return statement