netdev - [PATCH net-next 08/10] net: phylink: allow ethtool -A to change flow control advertisement

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Message-Id: <E1j2zhe-0003YH-OZ@rmk-PC.armlinux.org.uk>
Date:   Sat, 15 Feb 2020 15:49:58 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH net-next 08/10] net: phylink: allow ethtool -A to change flow
 control advertisement

When ethtool -A is used to change the pause modes, the pause
advertisement is not being changed, but the documentation in
uapi/linux/ethtool.h says we should be. Add that capability to
phylink.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phylink.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index c29648b90ce7..ab72bd1a7dca 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1385,6 +1385,7 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
 	    !pause->autoneg && pause->rx_pause != pause->tx_pause)
 		return -EINVAL;
 
+	mutex_lock(&pl->state_mutex);
 	config->pause = 0;
 	if (pause->autoneg)
 		config->pause |= MLO_PAUSE_AN;
@@ -1393,6 +1394,22 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
 	if (pause->tx_pause)
 		config->pause |= MLO_PAUSE_TX;
 
+	/*
+	 * See the comments for linkmode_set_pause(), wrt the deficiencies
+	 * with the current implementation.  A solution to this issue would
+	 * be:
+	 * ethtool  Local device
+	 *  rx  tx  Pause AsymDir
+	 *  0   0   0     0
+	 *  1   0   1     1
+	 *  0   1   0     1
+	 *  1   1   1     1
+	 * and then use the ethtool rx/tx enablement status to mask the
+	 * rx/tx pause resolution.
+	 */
+	linkmode_set_pause(config->advertising, pause->tx_pause,
+			   pause->rx_pause);
+
 	/* If we have a PHY, phylib will call our link state function if the
 	 * mode has changed, which will trigger a resolve and update the MAC
 	 * configuration.
@@ -1405,6 +1422,7 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
 		phylink_mac_config(pl, &pl->link_config);
 		phylink_mac_an_restart(pl);
 	}
+	mutex_unlock(&pl->state_mutex);
 
 	return 0;
 }
-- 
2.20.1