ethtool: Expand Ethernet Power Equipment with c33 (PoE) alongside PoDL

In the current PSE interface for Ethernet Power Equipment, support is
limited to PoDL. This patch extends the interface to accommodate the
objects specified in IEEE 802.3-2022 145.2 for Power sourcing
Equipment (PSE).

The following objects are now supported and considered mandatory:
- IEEE 802.3-2022 30.9.1.1.5 aPSEPowerDetectionStatus
- IEEE 802.3-2022 30.9.1.1.2 aPSEAdminState
- IEEE 802.3-2022 30.9.1.2.1 aPSEAdminControl

To avoid confusion between "PoDL PSE" and "PoE PSE", which have similar
names but distinct values, we have followed the suggestion of Oleksij
Rempel and Andrew Lunn to maintain separate naming schemes for each,
using c33 (clause 33) prefix for "PoE PSE".
You can find more details in the discussion threads here:
https://lore.kernel.org/netdev/20230912110637.GI780075@pengutronix.de/
https://lore.kernel.org/netdev/2539b109-72ad-470a-9dae-9f53de4f64ec@lunn.ch/

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://lore.kernel.org/r/20240417-feature_poe-v9-1-242293fd1900@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 46 insertions, 0 deletions

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 95c2f09f0d0a..7b9a3d890949 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -753,6 +753,49 @@ enum ethtool_module_power_mode {
 };
 
 /**
+ * enum ethtool_c33_pse_admin_state - operational state of the PoDL PSE
+ *	functions. IEEE 802.3-2022 30.9.1.1.2 aPSEAdminState
+ * @ETHTOOL_C33_PSE_ADMIN_STATE_UNKNOWN: state of PSE functions is unknown
+ * @ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED: PSE functions are disabled
+ * @ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED: PSE functions are enabled
+ */
+enum ethtool_c33_pse_admin_state {
+	ETHTOOL_C33_PSE_ADMIN_STATE_UNKNOWN = 1,
+	ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
+	ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED,
+};
+
+/**
+ * enum ethtool_c33_pse_pw_d_status - power detection status of the PSE.
+ *	IEEE 802.3-2022 30.9.1.1.3 aPoDLPSEPowerDetectionStatus:
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_UNKNOWN: PSE status is unknown
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_DISABLED: The enumeration "disabled"
+ *	indicates that the PSE State diagram is in the state DISABLED.
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_SEARCHING: The enumeration "searching"
+ *	indicates the PSE State diagram is in a state other than those
+ *	listed.
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING: The enumeration
+ *	"deliveringPower" indicates that the PSE State diagram is in the
+ *	state POWER_ON.
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_TEST: The enumeration "test" indicates that
+ *	the PSE State diagram is in the state TEST_MODE.
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_FAULT: The enumeration "fault" indicates that
+ *	the PSE State diagram is in the state TEST_ERROR.
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_OTHERFAULT: The enumeration "otherFault"
+ *	indicates that the PSE State diagram is in the state IDLE due to
+ *	the variable error_condition = true.
+ */
+enum ethtool_c33_pse_pw_d_status {
+	ETHTOOL_C33_PSE_PW_D_STATUS_UNKNOWN = 1,
+	ETHTOOL_C33_PSE_PW_D_STATUS_DISABLED,
+	ETHTOOL_C33_PSE_PW_D_STATUS_SEARCHING,
+	ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING,
+	ETHTOOL_C33_PSE_PW_D_STATUS_TEST,
+	ETHTOOL_C33_PSE_PW_D_STATUS_FAULT,
+	ETHTOOL_C33_PSE_PW_D_STATUS_OTHERFAULT,
+};
+
+/**
  * enum ethtool_podl_pse_admin_state - operational state of the PoDL PSE
  *	functions. IEEE 802.3-2018 30.15.1.1.2 aPoDLPSEAdminState
  * @ETHTOOL_PODL_PSE_ADMIN_STATE_UNKNOWN: state of PoDL PSE functions are
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index b4f0d233d048..f17dbe54bf5e 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -913,6 +913,9 @@ enum {
 	ETHTOOL_A_PODL_PSE_ADMIN_STATE,		/* u32 */
 	ETHTOOL_A_PODL_PSE_ADMIN_CONTROL,	/* u32 */
 	ETHTOOL_A_PODL_PSE_PW_D_STATUS,		/* u32 */
+	ETHTOOL_A_C33_PSE_ADMIN_STATE,		/* u32 */
+	ETHTOOL_A_C33_PSE_ADMIN_CONTROL,	/* u32 */
+	ETHTOOL_A_C33_PSE_PW_D_STATUS,		/* u32 */
 
 	/* add new constants above here */
 	__ETHTOOL_A_PSE_CNT,