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Date: Wed, 18 Dec 2019 18:50:58 +0000
From: Russell King - ARM Linux admin <linux@...linux.org.uk>
To: Vladimir Oltean <olteanv@...il.com>
Cc: davem@...emloft.net, jakub.kicinski@...ronome.com, andrew@...n.ch,
f.fainelli@...il.com, vivien.didelot@...il.com,
alexandru.marginean@....com, claudiu.manoil@....com,
xiaoliang.yang_1@....com, yangbo.lu@....com,
netdev@...r.kernel.org, alexandre.belloni@...tlin.com,
horatiu.vultur@...rochip.com,
Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [RFC PATCH v2 1/8] mii: Add helpers for parsing SGMII
auto-negotiation
On Wed, Dec 18, 2019 at 12:18:24AM +0200, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
>
> Typically a MAC PCS auto-configures itself after it receives the
> negotiated copper-side link settings from the PHY, but some MAC devices
> are more special and need manual interpretation of the SGMII AN result.
>
> In other cases, the PCS exposes the entire tx_config_reg base page as it
> is transmitted on the wire during auto-negotiation, so it makes sense to
> be able to decode the equivalent lp_advertised bit mask from the raw u16
> (of course, "lp" considering the PCS to be the local PHY).
>
> Therefore, add the bit definitions for the SGMII registers 4 and 5
> (local device ability, link partner ability), as well as a link_mode
> conversion helper that can be used to feed the AN results into
> phy_resolve_aneg_linkmode.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
> include/linux/mii.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
> include/uapi/linux/mii.h | 10 ++++++++++
> 2 files changed, 60 insertions(+)
>
> diff --git a/include/linux/mii.h b/include/linux/mii.h
> index 4ce8901a1af6..18c6208f56fc 100644
> --- a/include/linux/mii.h
> +++ b/include/linux/mii.h
> @@ -373,6 +373,56 @@ static inline u32 mii_lpa_to_ethtool_lpa_x(u32 lpa)
> }
>
> /**
> + * mii_lpa_mod_linkmode_adv_sgmii
> + * @lp_advertising: pointer to destination link mode.
> + * @lpa: value of the MII_LPA register
> + *
> + * A small helper function that translates MII_LPA bits to
> + * linkmode advertisement settings for SGMII.
> + * Leaves other bits unchanged.
> + */
> +static inline void
> +mii_lpa_mod_linkmode_lpa_sgmii(unsigned long *lp_advertising, u32 lpa)
> +{
> + u32 speed_duplex = lpa & LPA_SGMII_DPX_SPD_MASK;
> +
> + linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, lp_advertising,
> + speed_duplex == LPA_SGMII_1000HALF);
> +
> + linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, lp_advertising,
> + speed_duplex == LPA_SGMII_1000FULL);
> +
> + linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, lp_advertising,
> + speed_duplex == LPA_SGMII_100HALF);
> +
> + linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, lp_advertising,
> + speed_duplex == LPA_SGMII_100FULL);
> +
> + linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, lp_advertising,
> + speed_duplex == LPA_SGMII_10HALF);
> +
> + linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, lp_advertising,
> + speed_duplex == LPA_SGMII_10FULL);
> +}
> +
> +/**
> + * mii_lpa_to_linkmode_adv_sgmii
> + * @advertising: pointer to destination link mode.
> + * @lpa: value of the MII_LPA register
> + *
> + * A small helper function that translates MII_ADVERTISE bits
> + * to linkmode advertisement settings when in SGMII mode.
> + * Clears the old value of advertising.
> + */
> +static inline void mii_lpa_to_linkmode_lpa_sgmii(unsigned long *lp_advertising,
> + u32 lpa)
> +{
> + linkmode_zero(lp_advertising);
> +
> + mii_lpa_mod_linkmode_lpa_sgmii(lp_advertising, lpa);
> +}
> +
> +/**
> * mii_adv_mod_linkmode_adv_t
> * @advertising:pointer to destination link mode.
> * @adv: value of the MII_ADVERTISE register
> diff --git a/include/uapi/linux/mii.h b/include/uapi/linux/mii.h
> index 51b48e4be1f2..dc3b5d635beb 100644
> --- a/include/uapi/linux/mii.h
> +++ b/include/uapi/linux/mii.h
> @@ -71,6 +71,7 @@
> /* Advertisement control register. */
> #define ADVERTISE_SLCT 0x001f /* Selector bits */
> #define ADVERTISE_CSMA 0x0001 /* Only selector supported */
> +#define ADVERTISE_SGMII 0x0001 /* Can do SGMII */
> #define ADVERTISE_10HALF 0x0020 /* Try for 10mbps half-duplex */
> #define ADVERTISE_1000XFULL 0x0020 /* Try for 1000BASE-X full-duplex */
> #define ADVERTISE_10FULL 0x0040 /* Try for 10mbps full-duplex */
> @@ -94,6 +95,7 @@
>
> /* Link partner ability register. */
> #define LPA_SLCT 0x001f /* Same as advertise selector */
> +#define LPA_SGMII 0x0001 /* Can do SGMII */
> #define LPA_10HALF 0x0020 /* Can do 10mbps half-duplex */
> #define LPA_1000XFULL 0x0020 /* Can do 1000BASE-X full-duplex */
> #define LPA_10FULL 0x0040 /* Can do 10mbps full-duplex */
> @@ -104,11 +106,19 @@
> #define LPA_1000XPAUSE_ASYM 0x0100 /* Can do 1000BASE-X pause asym*/
> #define LPA_100BASE4 0x0200 /* Can do 100mbps 4k packets */
> #define LPA_PAUSE_CAP 0x0400 /* Can pause */
> +#define LPA_SGMII_DPX_SPD_MASK 0x1C00 /* SGMII duplex and speed bits */
> +#define LPA_SGMII_10HALF 0x0000 /* Can do SGMII 10mbps half-duplex */
> +#define LPA_SGMII_10FULL 0x1000 /* Can do SGMII 10mbps full-duplex */
> +#define LPA_SGMII_100HALF 0x0400 /* Can do SGMII 100mbps half-duplex */
> +#define LPA_SGMII_100FULL 0x1400 /* Can do SGMII 100mbps full-duplex */
> #define LPA_PAUSE_ASYM 0x0800 /* Can pause asymetrically */
> +#define LPA_SGMII_1000HALF 0x0800 /* Can do SGMII 1000mbps half-duplex */
> +#define LPA_SGMII_1000FULL 0x1800 /* Can do SGMII 1000mbps full-duplex */
> #define LPA_RESV 0x1000 /* Unused... */
> #define LPA_RFAULT 0x2000 /* Link partner faulted */
> #define LPA_LPACK 0x4000 /* Link partner acked us */
> #define LPA_NPAGE 0x8000 /* Next page bit */
> +#define LPA_SGMII_LINK 0x8000 /* Link partner has link */
I wonder whether mixing these definitions together is really such a
good idea, or whether separately grouping them would be better.
I already find the mixture of Clause 37 and Clause 22 definitions to
be a little difficult to spot which are which.
>
> #define LPA_DUPLEX (LPA_10FULL | LPA_100FULL)
> #define LPA_100 (LPA_100FULL | LPA_100HALF | LPA_100BASE4)
> --
> 2.7.4
>
>
--
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