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Date: Mon, 20 Jul 2020 10:44:11 +0000
From: Ioana Ciornei <ioana.ciornei@....com>
To: Russell King <rmk+kernel@...linux.org.uk>,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>
CC: Vladimir Oltean <vladimir.oltean@....com>,
Claudiu Manoil <claudiu.manoil@....com>,
Alexandru Marginean <alexandru.marginean@....com>,
"michael@...le.cc" <michael@...le.cc>,
"olteanv@...il.com" <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH RFC net-next 08/13] net: phylink: simplify phy case for
ksettings_set method
On 6/30/20 5:29 PM, Russell King wrote:
> When we have a PHY attached, an ethtool ksettings_set() call only
> really needs to call through to the phylib equivalent; phylib will
> call back to us when the link changes so we can update our state.
> Therefore, we can bypass most of our ksettings_set() call for this
> case.
>
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Reviewed-by: Ioana Ciornei <ioana.ciornei@....com>
> ---
> drivers/net/phy/phylink.c | 104 +++++++++++++++++---------------------
> 1 file changed, 47 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 103d2a550415..967c068d16c8 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -1312,13 +1312,33 @@ int phylink_ethtool_ksettings_set(struct phylink *pl,
> const struct ethtool_link_ksettings *kset)
> {
> __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
> - struct ethtool_link_ksettings our_kset;
> struct phylink_link_state config;
> const struct phy_setting *s;
> - int ret;
>
> ASSERT_RTNL();
>
> + if (pl->phydev) {
> + /* We can rely on phylib for this update; we also do not need
> + * to update the pl->link_config settings:
> + * - the configuration returned via ksettings_get() will come
> + * from phylib whenever a PHY is present.
> + * - link_config.interface will be updated by the PHY calling
> + * back via phylink_phy_change() and a subsequent resolve.
> + * - initial link configuration for PHY mode comes from the
> + * last phy state updated via phylink_phy_change().
> + * - other configuration changes (e.g. pause modes) are
> + * performed directly via phylib.
> + * - if in in-band mode with a PHY, the link configuration
> + * is passed on the link from the PHY, and all of
> + * link_config.{speed,duplex,an_enabled,pause} are not used.
> + * - the only possible use would be link_config.advertising
> + * pause modes when in 1000base-X mode with a PHY, but in
> + * the presence of a PHY, this should not be changed as that
> + * should be determined from the media side advertisement.
> + */
> + return phy_ethtool_ksettings_set(pl->phydev, kset);
> + }
> +
Also tested the PHY use case, no issue encountered with changing the
advertisements, autoneg etc
> linkmode_copy(support, pl->supported);
> config = pl->link_config;
> config.an_enabled = kset->base.autoneg == AUTONEG_ENABLE;
> @@ -1365,65 +1385,35 @@ int phylink_ethtool_ksettings_set(struct phylink *pl,
> return -EINVAL;
> }
>
> - if (pl->phydev) {
> - /* If we have a PHY, we process the kset change via phylib.
> - * phylib will call our link state function if the PHY
> - * parameters have changed, which will trigger a resolve
> - * and update the MAC configuration.
> - */
> - our_kset = *kset;
> - linkmode_copy(our_kset.link_modes.advertising,
> - config.advertising);
> - our_kset.base.speed = config.speed;
> - our_kset.base.duplex = config.duplex;
> + /* For a fixed link, this isn't able to change any parameters,
> + * which just leaves inband mode.
> + */
> + if (phylink_validate(pl, support, &config))
> + return -EINVAL;
>
> - ret = phy_ethtool_ksettings_set(pl->phydev, &our_kset);
> - if (ret)
> - return ret;
> + /* If autonegotiation is enabled, we must have an advertisement */
> + if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
> + return -EINVAL;
>
> - mutex_lock(&pl->state_mutex);
> - /* Save the new configuration */
> - linkmode_copy(pl->link_config.advertising,
> - our_kset.link_modes.advertising);
> - pl->link_config.interface = config.interface;
> - pl->link_config.speed = our_kset.base.speed;
> - pl->link_config.duplex = our_kset.base.duplex;
> - pl->link_config.an_enabled = our_kset.base.autoneg !=
> - AUTONEG_DISABLE;
> - mutex_unlock(&pl->state_mutex);
> - } else {
> - /* For a fixed link, this isn't able to change any parameters,
> - * which just leaves inband mode.
> + mutex_lock(&pl->state_mutex);
> + linkmode_copy(pl->link_config.advertising, config.advertising);
> + pl->link_config.interface = config.interface;
> + pl->link_config.speed = config.speed;
> + pl->link_config.duplex = config.duplex;
> + pl->link_config.an_enabled = kset->base.autoneg !=
> + AUTONEG_DISABLE;
Is there a specific reason why this is not just using config.an_enabled
to sync back to pl->link_config?
> +
> + if (pl->cur_link_an_mode == MLO_AN_INBAND &&
> + !test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
> + /* If in 802.3z mode, this updates the advertisement.
> + *
> + * If we are in SGMII mode without a PHY, there is no
> + * advertisement; the only thing we have is the pause
> + * modes which can only come from a PHY.
> */
> - if (phylink_validate(pl, support, &config))
> - return -EINVAL;
> -
> - /* If autonegotiation is enabled, we must have an advertisement */
> - if (config.an_enabled &&
> - phylink_is_empty_linkmode(config.advertising))
> - return -EINVAL;
> -
> - mutex_lock(&pl->state_mutex);
> - linkmode_copy(pl->link_config.advertising, config.advertising);
> - pl->link_config.interface = config.interface;
> - pl->link_config.speed = config.speed;
> - pl->link_config.duplex = config.duplex;
> - pl->link_config.an_enabled = kset->base.autoneg !=
> - AUTONEG_DISABLE;
> -
> - if (pl->cur_link_an_mode == MLO_AN_INBAND &&
> - !test_bit(PHYLINK_DISABLE_STOPPED,
> - &pl->phylink_disable_state)) {
> - /* If in 802.3z mode, this updates the advertisement.
> - *
> - * If we are in SGMII mode without a PHY, there is no
> - * advertisement; the only thing we have is the pause
> - * modes which can only come from a PHY.
> - */
> - phylink_pcs_config(pl, true, &pl->link_config);
> - }
> - mutex_unlock(&pl->state_mutex);
> + phylink_pcs_config(pl, true, &pl->link_config);
> }
> + mutex_unlock(&pl->state_mutex);
>
> return 0;
> }
>
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