Subject: Re: [PATCH net-next v2 3/5] net: phy: update in-band AN mode when changing interface by PHY driver

From: "Russell King (Oracle)" <[email-masked]>
Date: Fri, 4 Aug 2023 10:02:35 +0100

On Fri, Aug 04, 2023 at 04:45:25PM +0800, Choong Yong Liang wrote:
> From: "Tan, Tee Min" <[email-masked]>
> 
> Add cur_link_an_mode into phy_device struct for PHY drivers to
> communicate the in-band AN mode setting with phylink framework.
> 
> As there is a mechanism in PHY drivers to switch the PHY interface
> between SGMII and 2500BaseX according to link speed. In this case,
> the in-band AN mode should be switching based on the PHY interface
> as well, if the PHY interface has been changed/updated by PHY driver.
> 
> For e.g., disable in-band AN in 2500BaseX mode, or enable in-band AN
> back for SGMII mode (10/100/1000Mbps).
> 
> Signed-off-by: Tan, Tee Min <[email-masked]>
> Signed-off-by: Choong Yong Liang <[email-masked]>
> ---
>  drivers/net/phy/marvell10g.c | 6 ++++++
>  drivers/net/phy/phylink.c    | 4 ++++
>  include/linux/phy.h          | 3 +++
>  3 files changed, 13 insertions(+)
> 
> diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
> index d4bb90d76881..a9df19278618 100644
> --- a/drivers/net/phy/marvell10g.c
> +++ b/drivers/net/phy/marvell10g.c
> @@ -30,6 +30,7 @@
>  #include <linux/phy.h>
>  #include <linux/sfp.h>
>  #include <linux/netdevice.h>
> +#include <linux/phylink.h>
>  
>  #define MV_PHY_ALASKA_NBT_QUIRK_MASK	0xfffffffe
>  #define MV_PHY_ALASKA_NBT_QUIRK_REV	(MARVELL_PHY_ID_88X3310 | 0xa)
> @@ -946,6 +947,9 @@ static void mv3310_update_interface(struct phy_device *phydev)
>  	 * xaui / rxaui modes according to the speed.
>  	 * Florian suggests setting phydev->interface to communicate this to the
>  	 * MAC. Only do this if we are already in one of the above modes.
> +	 * In-band Auto-negotiation is not supported in 2500BASE-X.
> +	 * Setting phydev->cur_link_an_mode to communicate this to the
> +	 * phylink framework.
>  	 */
>  	switch (phydev->speed) {
>  	case SPEED_10000:
> @@ -956,11 +960,13 @@ static void mv3310_update_interface(struct phy_device *phydev)
>  		break;
>  	case SPEED_2500:
>  		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
> +		phydev->cur_link_an_mode = MLO_AN_PHY;
>  		break;
>  	case SPEED_1000:
>  	case SPEED_100:
>  	case SPEED_10:
>  		phydev->interface = PHY_INTERFACE_MODE_SGMII;
> +		phydev->cur_link_an_mode = MLO_AN_INBAND;
>  		break;
>  	default:
>  		break;
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 4f1c8bb199e9..f9cbb6d7e134 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -1720,6 +1720,8 @@ static void phylink_phy_change(struct phy_device *phydev, bool up)
>  		pl->phy_state.pause |= MLO_PAUSE_RX;
>  	pl->phy_state.interface = phydev->interface;
>  	pl->phy_state.link = up;
> +	pl->cur_link_an_mode = phydev->cur_link_an_mode;
> +	pl->cfg_link_an_mode = phydev->cur_link_an_mode;
>  	mutex_unlock(&pl->state_mutex);
>  
>  	phylink_run_resolve(pl);
> @@ -1824,6 +1826,8 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
>  	if (pl->config->mac_managed_pm)
>  		phy->mac_managed_pm = true;
>  
> +	pl->phydev->cur_link_an_mode = pl->cur_link_an_mode;

I am really not happy with exposing phylink's AN mode into phylib.

-- 
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