netdev - Re: [net-next.git 1/4 (v4)] phy: add the EEE support and the way to access to the MMD registers.

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Date:	Tue, 12 Jun 2012 17:50:20 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
CC:	<netdev@...r.kernel.org>, <rayagond@...avyalabs.com>,
	<davem@...emloft.net>, <yuvalmin@...adcom.com>
Subject: Re: [net-next.git 1/4 (v4)] phy: add the EEE support and the way to
 access to the MMD registers.

On Tue, 2012-06-12 at 14:45 +0200, Giuseppe CAVALLARO wrote:
> This patch adds the support for the Energy-Efficient Ethernet (EEE)
> to the Physical Abstraction Layer.
> To support the EEE we have to access to the MMD registers 3.20 and
> 7.60/61. So two new functions have been added to read/write the MMD
> registers (clause 45).
> 
> An Ethernet driver (I tested the stmmac) can invoke the phy_init_eee to properly
> check if the EEE is supported by the PHYs and it can also set the clock
> stop enable bit in the 3.0 register.
> The phy_get_eee_err can be used for reporting the number of time where
> the PHY failed to complete its normal wake sequence.
> 
> In the end, this patch also adds the EEE ethtool support implementing:
>  o phy_ethtool_set_eee
>  o phy_ethtool_get_eee
[...]
> --- a/drivers/net/phy/phy.c
> +++ b/drivers/net/phy/phy.c
[...]
> +static int phy_eee_to_adv(int eee_adv)
> +{
> +	int adv = 0;
> +
> +	if (eee_adv & MDIO_EEE_100TX)
> +		adv |= ADVERTISED_100baseT_Full;
> +	if (eee_adv & MDIO_EEE_1000T)
> +		adv |= ADVERTISED_1000baseT_Full;
> +	if (eee_adv & MDIO_EEE_10GT)
> +		adv |= ADVERTISED_10000baseT_Full;
> +	if (eee_adv & MDIO_EEE_1000KX)
> +		adv |= ADVERTISED_1000baseKX_Full;
> +	if (eee_adv & MDIO_EEE_10GKX4)
> +		adv |= ADVERTISED_10000baseKX4_Full;
> +	if (eee_adv & MDIO_EEE_10GKR)
> +		adv |= ADVERTISED_10000baseKR_Full;
> +
> +	return adv;
> +}

The type of 'adv' and the return type should be u32 (per ethtool API);
the type of 'eee_adv' should be u16 (16-bit register).

Similarly in phy_eee_to_supported() and phy_adv_to_eee().

[...]
> --- a/include/linux/mii.h
> +++ b/include/linux/mii.h
[...]
> @@ -141,6 +143,15 @@
>  #define FLOW_CTRL_TX		0x01
>  #define FLOW_CTRL_RX		0x02
>  
> +/* MMD Access Control register fields */
> +#define MII_MMD_CTRL_DEVAD_MASK			0x1f	/* Mask MMD DEVAD*/
> +#define MII_MMD_CTRL_FUNC_ADDR			0x0000	/* Address */
> +#define MII_MMD_CTRL_FUNC_DATA_NOINCR		0x4000	/* no post increment */
> +#define MII_MMD_CTRL_FUNC_DATA_INCR_ON_RDWT	0x8000	/* post increment on
> +							 * reads & writes */
> +#define MII_MMD_CTRL_FUNC_DATA_INCR_ON_WT	0xC000	/* post increment on
> +							 * writes only */
> +
[...]

These names are quite long; could they reasonably be shortened, e.g. by
dropping 'FUNC_' and 'DATA_' parts?

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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