netdev - Re: [PATCH v5 iwl-next 2/6] ice: Use FIELD

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Message-ID: <20240810081851.GE1951@kernel.org>
Date: Sat, 10 Aug 2024 09:18:51 +0100
From: Simon Horman <horms@...nel.org>
To: Karol Kolacinski <karol.kolacinski@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com, przemyslaw.kitszel@...el.com
Subject: Re: [PATCH v5 iwl-next 2/6] ice: Use FIELD_PREP for timestamp values

On Thu, Aug 08, 2024 at 02:57:44PM +0200, Karol Kolacinski wrote:
> Instead of using shifts and casts, use FIELD_PREP after reading 40b
> timestamp values.
> 
> Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_ptp_hw.c |  6 ++++--
>  drivers/net/ethernet/intel/ice/ice_ptp_hw.h | 13 +++++--------
>  2 files changed, 9 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp_hw.c b/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
> index 00c6483dbffc..d1b87838986d 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
> @@ -1520,7 +1520,8 @@ static int ice_read_ptp_tstamp_eth56g(struct ice_hw *hw, u8 port, u8 idx,
>  	 * lower 8 bits in the low register, and the upper 32 bits in the high
>  	 * register.
>  	 */
> -	*tstamp = ((u64)hi) << TS_PHY_HIGH_S | ((u64)lo & TS_PHY_LOW_M);
> +	*tstamp = FIELD_PREP(PHY_40B_HIGH_M, hi) |
> +		  FIELD_PREP(PHY_40B_LOW_M, lo);
>  
>  	return 0;
>  }
> @@ -4952,7 +4953,8 @@ ice_read_phy_tstamp_e810(struct ice_hw *hw, u8 lport, u8 idx, u64 *tstamp)
>  	/* For E810 devices, the timestamp is reported with the lower 32 bits
>  	 * in the low register, and the upper 8 bits in the high register.
>  	 */
> -	*tstamp = ((u64)hi) << TS_HIGH_S | ((u64)lo & TS_LOW_M);
> +	*tstamp = FIELD_PREP(PHY_EXT_40B_HIGH_M, hi) |
> +		  FIELD_PREP(PHY_EXT_40B_LOW_M, lo);
>  
>  	return 0;
>  }
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp_hw.h b/drivers/net/ethernet/intel/ice/ice_ptp_hw.h
> index 8a28155b206f..df94230d820f 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp_hw.h
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp_hw.h
> @@ -673,15 +673,12 @@ static inline u64 ice_get_base_incval(struct ice_hw *hw)
>  /* Source timer incval macros */
>  #define INCVAL_HIGH_M			0xFF
>  
> -/* Timestamp block macros */
> +/* PHY 40b registers macros */
> +#define PHY_EXT_40B_LOW_M		GENMASK(31, 0)
> +#define PHY_EXT_40B_HIGH_M		GENMASK_ULL(39, 32)
> +#define PHY_40B_LOW_M			GENMASK(7, 0)
> +#define PHY_40B_HIGH_M			GENMASK_ULL(39, 8)
>  #define TS_VALID			BIT(0)
> -#define TS_LOW_M			0xFFFFFFFF
> -#define TS_HIGH_M			0xFF
> -#define TS_HIGH_S			32
> -
> -#define TS_PHY_LOW_M			0xFF
> -#define TS_PHY_HIGH_M			0xFFFFFFFF

I think it it would be best to defer removing (at least)
TS_PHY_LOW_M and TS_PHY_HIGH_M until the following patch,
as they are still in use until then.

As is, this patch results in build failures.

> -#define TS_PHY_HIGH_S			8
>  
>  #define BYTES_PER_IDX_ADDR_L_U		8
>  #define BYTES_PER_IDX_ADDR_L		4
> -- 
> 2.45.2
> 
>