ethtool: add interface to interact with Ethernet Power Equipment

Add interface to support Power Sourcing Equipment. At current step it
provides generic way to address all variants of PSE devices as defined
in IEEE 802.3-2018 but support only objects specified for IEEE 802.3-2018 104.4
PoDL Power Sourcing Equipment (PSE).

Currently supported and mandatory objects are:
IEEE 802.3-2018 30.15.1.1.3 aPoDLPSEPowerDetectionStatus
IEEE 802.3-2018 30.15.1.1.2 aPoDLPSEAdminState
IEEE 802.3-2018 30.15.1.2.1 acPoDLPSEAdminControl

This is minimal interface needed to control PSE on each separate
ethernet port but it provides not all mandatory objects specified in
IEEE 802.3-2018.

Since "PoDL PSE" and "PSE" have similar names, but some different values
I decide to not merge them and keep separate naming schema. This should
allow as to be as close to IEEE 802.3 spec as possible and avoid name
conflicts in the future.

This implementation is connected to PHYs instead of MACs because PSE
auto classification can potentially interfere with PHY auto negotiation.
So, may be some extra PHY related initialization will be needed.

With WIP version of ethtools interaction with PSE capable link looks
as following:

$ ip l
...
5: t1l1@eth0: <BROADCAST,MULTICAST> ..
...

$ ethtool --show-pse t1l1
PSE attributs for t1l1:
PoDL PSE Admin State: disabled
PoDL PSE Power Detection Status: disabled

$ ethtool --set-pse t1l1 podl-pse-admin-control enable
$ ethtool --show-pse t1l1
PSE attributs for t1l1:
PoDL PSE Admin State: enabled
PoDL PSE Power Detection Status: delivering power

Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index f431159fcc0b..146b81f08a89 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -254,3 +254,61 @@ out:
 	return psec;
 }
 EXPORT_SYMBOL_GPL(of_pse_control_get);
+
+/**
+ * pse_ethtool_get_status - get status of PSE control
+ * @psec: PSE control pointer
+ * @extack: extack for reporting useful error messages
+ * @status: struct to store PSE status
+ */
+int pse_ethtool_get_status(struct pse_control *psec,
+			   struct netlink_ext_ack *extack,
+			   struct pse_control_status *status)
+{
+	const struct pse_controller_ops *ops;
+	int err;
+
+	ops = psec->pcdev->ops;
+
+	if (!ops->ethtool_get_status) {
+		NL_SET_ERR_MSG(extack,
+			       "PSE driver does not support status report");
+		return -EOPNOTSUPP;
+	}
+
+	mutex_lock(&psec->pcdev->lock);
+	err = ops->ethtool_get_status(psec->pcdev, psec->id, extack, status);
+	mutex_unlock(&psec->pcdev->lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(pse_ethtool_get_status);
+
+/**
+ * pse_ethtool_set_config - set PSE control configuration
+ * @psec: PSE control pointer
+ * @extack: extack for reporting useful error messages
+ * @config: Configuration of the test to run
+ */
+int pse_ethtool_set_config(struct pse_control *psec,
+			   struct netlink_ext_ack *extack,
+			   const struct pse_control_config *config)
+{
+	const struct pse_controller_ops *ops;
+	int err;
+
+	ops = psec->pcdev->ops;
+
+	if (!ops->ethtool_set_config) {
+		NL_SET_ERR_MSG(extack,
+			       "PSE driver does not configuration");
+		return -EOPNOTSUPP;
+	}
+
+	mutex_lock(&psec->pcdev->lock);
+	err = ops->ethtool_set_config(psec->pcdev, psec->id, extack, config);
+	mutex_unlock(&psec->pcdev->lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(pse_ethtool_set_config);