netdev - [PATCH net-next 2/2] net: phy: add keep_data

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Date: Mon, 24 Jul 2023 17:24:59 +0800
From: Mengyuan Lou <mengyuanlou@...-swift.com>
To: netdev@...r.kernel.org
Cc: Mengyuan Lou <mengyuanlou@...-swift.com>
Subject: [PATCH net-next 2/2] net: phy: add keep_data_connection to struct phydev

Add flag keep_data_connection to struct phydev indicating whether
phy need to keep data connection.
Phy_suspend() will use it to decide whether PHY can be suspended
or not.

Signed-off-by: Mengyuan Lou <mengyuanlou@...-swift.com>
---
 drivers/net/phy/phy_device.c | 6 ++++--
 include/linux/phy.h          | 3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 0c2014accba7..4fe26660458e 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1860,8 +1860,10 @@ int phy_suspend(struct phy_device *phydev)
 
 	phy_ethtool_get_wol(phydev, &wol);
 	phydev->wol_enabled = wol.wolopts || (netdev && netdev->wol_enabled);
-	/* If the device has WOL enabled, we cannot suspend the PHY */
-	if (phydev->wol_enabled && !(phydrv->flags & PHY_ALWAYS_CALL_SUSPEND))
+	phydev->keep_data_connection = phydev->wol_enabled ||
+				       (netdev && netdev->ncsi_enabled);
+	/* We cannot suspend the PHY, when phy and mac need to receive packets. */
+	if (phydev->keep_data_connection && !(phydrv->flags & PHY_ALWAYS_CALL_SUSPEND))
 		return -EBUSY;
 
 	if (!phydrv || !phydrv->suspend)
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 11c1e91563d4..bda646e7cc23 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -554,6 +554,8 @@ struct macsec_ops;
  * @mac_managed_pm: Set true if MAC driver takes of suspending/resuming PHY
  * @wol_enabled: Set to true if the PHY or the attached MAC have Wake-on-LAN
  * 		 enabled.
+ * @keep_data_connection: Set to true if the PHY or the attached MAC need
+ *                        physical connection to receive packets.
  * @state: State of the PHY for management purposes
  * @dev_flags: Device-specific flags used by the PHY driver.
  *
@@ -651,6 +653,7 @@ struct phy_device {
 	unsigned is_on_sfp_module:1;
 	unsigned mac_managed_pm:1;
 	unsigned wol_enabled:1;
+	unsigned keep_data_connection:1;
 
 	unsigned autoneg:1;
 	/* The most recently read link state */
-- 
2.41.0