netdev - [PATCH net-next v1 1/1] net: asix: add optional flow control support

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Date:   Fri, 24 Jun 2022 10:02:07 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Lukas Wunner <lukas@...ner.de>
Subject: [PATCH net-next v1 1/1] net: asix: add optional flow control support

Add optional flow control support with respect to the link partners
abilities.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/usb/asix_common.c  | 10 ++++++++++
 drivers/net/usb/asix_devices.c |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
index b4a1b7abcfc9..c9df7cd8daae 100644
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -420,6 +420,8 @@ void asix_adjust_link(struct net_device *netdev)
 	u16 mode = 0;
 
 	if (phydev->link) {
+		bool tx_pause, rx_pause;
+
 		mode = AX88772_MEDIUM_DEFAULT;
 
 		if (phydev->duplex == DUPLEX_HALF)
@@ -427,6 +429,14 @@ void asix_adjust_link(struct net_device *netdev)
 
 		if (phydev->speed != SPEED_100)
 			mode &= ~AX_MEDIUM_PS;
+
+		phy_get_pause(phydev, &tx_pause, &rx_pause);
+
+		if (rx_pause)
+			mode |= AX_MEDIUM_RFC;
+
+		if (tx_pause)
+			mode |= AX_MEDIUM_TFC;
 	}
 
 	asix_write_medium_mode(dev, mode, 0);
diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index 5b5eb630c4b7..1bb12bbc34bf 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -677,6 +677,8 @@ static int ax88772_init_phy(struct usbnet *dev)
 	phy_suspend(priv->phydev);
 	priv->phydev->mac_managed_pm = 1;
 
+	phy_support_asym_pause(priv->phydev);
+
 	phy_attached_info(priv->phydev);
 
 	if (priv->embd_phy)
-- 
2.30.2