linux-kernel - Re: [PATCH net-next v1 6/7] phy: dp83td510: add statistics support

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Message-ID: <Z1GZVf7R9AYeRJAF@shell.armlinux.org.uk>
Date: Thu, 5 Dec 2024 12:15:17 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Jonathan Corbet <corbet@....net>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Simon Horman <horms@...nel.org>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next v1 6/7] phy: dp83td510: add statistics support

On Tue, Dec 03, 2024 at 08:56:20AM +0100, Oleksij Rempel wrote:
> Add support for reporting PHY statistics in the DP83TD510 driver. This
> includes cumulative tracking of transmit/receive packet counts, and
> error counts. Implemented functions to update and provide statistics via
> ethtool, with optional polling support enabled through `PHY_POLL_STATS`.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/phy/dp83td510.c | 98 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 97 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/dp83td510.c b/drivers/net/phy/dp83td510.c
> index 92aa3a2b9744..08d61a6a8c61 100644
> --- a/drivers/net/phy/dp83td510.c
> +++ b/drivers/net/phy/dp83td510.c
> @@ -34,6 +34,24 @@
>  #define DP83TD510E_CTRL_HW_RESET		BIT(15)
>  #define DP83TD510E_CTRL_SW_RESET		BIT(14)
>  
> +#define DP83TD510E_PKT_STAT_1			0x12b
> +#define DP83TD510E_TX_PKT_CNT_15_0_MASK		GENMASK(15, 0)
> +
> +#define DP83TD510E_PKT_STAT_2			0x12c
> +#define DP83TD510E_TX_PKT_CNT_31_16_MASK	GENMASK(15, 0)
> +
> +#define DP83TD510E_PKT_STAT_3			0x12d
> +#define DP83TD510E_TX_ERR_PKT_CNT_MASK		GENMASK(15, 0)
> +
> +#define DP83TD510E_PKT_STAT_4			0x12e
> +#define DP83TD510E_RX_PKT_CNT_15_0_MASK		GENMASK(15, 0)
> +
> +#define DP83TD510E_PKT_STAT_5			0x12f
> +#define DP83TD510E_RX_PKT_CNT_31_16_MASK	GENMASK(15, 0)
> +
> +#define DP83TD510E_PKT_STAT_6			0x130
> +#define DP83TD510E_RX_ERR_PKT_CNT_MASK		GENMASK(15, 0)

I'm not sure I like this pattern of _MASK here. Why not call these
registers e.g. DP83TD510E_RX_PKT_CNT_31_16 ? Given that the full
register value is used, I don't see the need for _MASK and the
FIELD_GET()s, which just add extra complexity to the code and
reduce readability.

-- 
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