netdev - Re: [net-next.git 4/4 (v6)] phy: add the EEE support and the way to access to the MMD registers.

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Date:	Tue, 19 Jun 2012 15:41:55 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
CC:	<netdev@...r.kernel.org>, <eric.dumazet@...il.com>,
	<rayagond@...avyalabs.com>, <davem@...emloft.net>,
	<yuvalmin@...adcom.com>
Subject: Re: [net-next.git 4/4 (v6)] phy: add the EEE support and the way to
 access to the MMD registers.

On Mon, 2012-06-18 at 08:49 +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
> 
> v1: initial patch
> v2: fixed some errors especially on naming convention
> v3: renamed again the mmd read/write functions thank to Ben's feedback
> v4: moved file to phy.c and added the ethtool support.
> v5: fixed phy_adv_to_eee, phy_eee_to_supported, phy_eee_to_adv return
>     values according to ethtool API (thanks to Ben's feedback).
>     Renamed some macros to avoid too long names.
> v6: fixed kernel-doc comments to be properly parsed.
>     Fixed the phy_init_eee function: we need to check which link mode
>     was autonegotiated and then the corresponding bits in 7.60 and 7.61
>     registers.
[...]
> +		adv = phy_eee_to_adv(eee_adv);
> +		lp = phy_eee_to_adv(eee_lp);
> +		if (!(lp & adv & phydev->advertising))
> +			goto eee_exit;
[...]

phydev->advertising is not the link mode that was autonegotiated, so I
can't believe this is right.  I think you need to use something like:

		adv = phy_eee_to_adv(eee_adv);
		lp = phy_eee_to_adv(eee_lp);
		i = phy_find_setting(phydev->speed, phydev->duplex);
		if ((lp & adv & settings[i].setting))
			goto eee_exit;

and require that genphy_read_status() is called first.  But I haven't
used phylib so I'm not at all sure about this!

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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