ice: subfunction activation and base devlink ops

Use previously implemented SF aux driver. It is probe during SF
activation and remove after deactivation.

Implement set/get hw_address and set/get state as basic devlink ops for
subfunction.

Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Piotr Raczynski <[e-mail]>
Signed-off-by: Michal Swiatkowski <[e-mail]>
Tested-by: Rafal Romanowski <[e-mail]>
Signed-off-by: Tony Nguyen <[e-mail]>

drivers/net/ethernet/intel/ice/devlink/devlink_port.c

···
 }
 
 /**
+ * ice_activate_dynamic_port - Activate a dynamic port
+ * @dyn_port: dynamic port instance to activate
+ * @extack: extack for reporting error messages
+ *
+ * Activate the dynamic port based on its flavour.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+static int
+ice_activate_dynamic_port(struct ice_dynamic_port *dyn_port,
+			  struct netlink_ext_ack *extack)
+{
+	int err;
+
+	if (dyn_port->active)
+		return 0;
+
+	err = ice_sf_eth_activate(dyn_port, extack);
+	if (err)
+		return err;
+
+	dyn_port->active = true;
+
+	return 0;
+}
+
+/**
+ * ice_deactivate_dynamic_port - Deactivate a dynamic port
+ * @dyn_port: dynamic port instance to deactivate
+ *
+ * Undo activation of a dynamic port.
+ */
+static void ice_deactivate_dynamic_port(struct ice_dynamic_port *dyn_port)
+{
+	if (!dyn_port->active)
+		return;
+
+	ice_sf_eth_deactivate(dyn_port);
+	dyn_port->active = false;
+}
+
+/**
  * ice_dealloc_dynamic_port - Deallocate and remove a dynamic port
  * @dyn_port: dynamic port instance to deallocate
  *
···
 {
 	struct devlink_port *devlink_port = &dyn_port->devlink_port;
 	struct ice_pf *pf = dyn_port->pf;
+
+	ice_deactivate_dynamic_port(dyn_port);
 
 	xa_erase(&pf->sf_nums, devlink_port->attrs.pci_sf.sf);
 	ice_eswitch_detach_sf(pf, dyn_port);
···
 	return 0;
 }
 
+/**
+ * ice_devlink_port_fn_hw_addr_set - devlink handler for mac address set
+ * @port: pointer to devlink port
+ * @hw_addr: hw address to set
+ * @hw_addr_len: hw address length
+ * @extack: extack for reporting error messages
+ *
+ * Sets mac address for the port, verifies arguments and copies address
+ * to the subfunction structure.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+static int
+ice_devlink_port_fn_hw_addr_set(struct devlink_port *port, const u8 *hw_addr,
+				int hw_addr_len,
+				struct netlink_ext_ack *extack)
+{
+	struct ice_dynamic_port *dyn_port;
+
+	dyn_port = ice_devlink_port_to_dyn(port);
+
+	if (dyn_port->attached) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Ethernet address can be change only in detached state");
+		return -EBUSY;
+	}
+
+	if (hw_addr_len != ETH_ALEN || !is_valid_ether_addr(hw_addr)) {
+		NL_SET_ERR_MSG_MOD(extack, "Invalid ethernet address");
+		return -EADDRNOTAVAIL;
+	}
+
+	ether_addr_copy(dyn_port->hw_addr, hw_addr);
+
+	return 0;
+}
+
+/**
+ * ice_devlink_port_fn_hw_addr_get - devlink handler for mac address get
+ * @port: pointer to devlink port
+ * @hw_addr: hw address to set
+ * @hw_addr_len: hw address length
+ * @extack: extack for reporting error messages
+ *
+ * Returns mac address for the port.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+static int
+ice_devlink_port_fn_hw_addr_get(struct devlink_port *port, u8 *hw_addr,
+				int *hw_addr_len,
+				struct netlink_ext_ack *extack)
+{
+	struct ice_dynamic_port *dyn_port;
+
+	dyn_port = ice_devlink_port_to_dyn(port);
+
+	ether_addr_copy(hw_addr, dyn_port->hw_addr);
+	*hw_addr_len = ETH_ALEN;
+
+	return 0;
+}
+
+/**
+ * ice_devlink_port_fn_state_set - devlink handler for port state set
+ * @port: pointer to devlink port
+ * @state: state to set
+ * @extack: extack for reporting error messages
+ *
+ * Activates or deactivates the port.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+static int
+ice_devlink_port_fn_state_set(struct devlink_port *port,
+			      enum devlink_port_fn_state state,
+			      struct netlink_ext_ack *extack)
+{
+	struct ice_dynamic_port *dyn_port;
+
+	dyn_port = ice_devlink_port_to_dyn(port);
+
+	switch (state) {
+	case DEVLINK_PORT_FN_STATE_ACTIVE:
+		return ice_activate_dynamic_port(dyn_port, extack);
+
+	case DEVLINK_PORT_FN_STATE_INACTIVE:
+		ice_deactivate_dynamic_port(dyn_port);
+		break;
+	}
+
+	return 0;
+}
+
+/**
+ * ice_devlink_port_fn_state_get - devlink handler for port state get
+ * @port: pointer to devlink port
+ * @state: admin configured state of the port
+ * @opstate: current port operational state
+ * @extack: extack for reporting error messages
+ *
+ * Gets port state.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+static int
+ice_devlink_port_fn_state_get(struct devlink_port *port,
+			      enum devlink_port_fn_state *state,
+			      enum devlink_port_fn_opstate *opstate,
+			      struct netlink_ext_ack *extack)
+{
+	struct ice_dynamic_port *dyn_port;
+
+	dyn_port = ice_devlink_port_to_dyn(port);
+
+	if (dyn_port->active)
+		*state = DEVLINK_PORT_FN_STATE_ACTIVE;
+	else
+		*state = DEVLINK_PORT_FN_STATE_INACTIVE;
+
+	if (dyn_port->attached)
+		*opstate = DEVLINK_PORT_FN_OPSTATE_ATTACHED;
+	else
+		*opstate = DEVLINK_PORT_FN_OPSTATE_DETACHED;
+
+	return 0;
+}
+
 static const struct devlink_port_ops ice_devlink_port_sf_ops = {
 	.port_del = ice_devlink_port_del,
+	.port_fn_hw_addr_get = ice_devlink_port_fn_hw_addr_get,
+	.port_fn_hw_addr_set = ice_devlink_port_fn_hw_addr_set,
+	.port_fn_state_get = ice_devlink_port_fn_state_get,
+	.port_fn_state_set = ice_devlink_port_fn_state_set,
 };
 
 /**

drivers/net/ethernet/intel/ice/devlink/devlink_port.h

···
  * struct ice_dynamic_port - Track dynamically added devlink port instance
  * @hw_addr: the HW address for this port
  * @active: true if the port has been activated
+ * @attached: true it the prot is attached
  * @devlink_port: the associated devlink port structure
  * @pf: pointer to the PF private structure
  * @vsi: the VSI associated with this port
  * @repr_id: the representor ID
  * @sfnum: the subfunction ID
+ * @sf_dev: pointer to the subfunction device
  *
  * An instance of a dynamically added devlink port. Each port flavour
  */
 struct ice_dynamic_port {
 	u8 hw_addr[ETH_ALEN];
 	u8 active: 1;
+	u8 attached: 1;
 	struct devlink_port devlink_port;
 	struct ice_pf *pf;
 	struct ice_vsi *vsi;
 	unsigned long repr_id;
 	u32 sfnum;
+	/* Flavour-specific implementation data */
+	union {
+		struct ice_sf_dev *sf_dev;
+	};
 };
 
 void ice_dealloc_all_dynamic_ports(struct ice_pf *pf);

drivers/net/ethernet/intel/ice/ice_sf_eth.c

···
 	devl_register(devlink);
 	devl_unlock(devlink);
 
+	dyn_port->attached = true;
+
 	return 0;
 
 err_netdev_decfg:
···
 	devl_unlock(devlink);
 	devlink_free(devlink);
 	ice_vsi_decfg(vsi);
+
+	dyn_port->attached = false;
 }
 
 static const struct auxiliary_device_id ice_sf_dev_id_table[] = {
···
 	.remove = ice_sf_dev_remove,
 	.id_table = ice_sf_dev_id_table
 };
+
+static DEFINE_XARRAY_ALLOC1(ice_sf_aux_id);
 
 /**
  * ice_sf_driver_register - Register new auxiliary subfunction driver
···
 void ice_sf_driver_unregister(void)
 {
 	auxiliary_driver_unregister(&ice_sf_driver);
+}
+
+/**
+ * ice_sf_dev_release - Release device associated with auxiliary device
+ * @device: pointer to the device
+ *
+ * Since most of the code for subfunction deactivation is handled in
+ * the remove handler, here just free tracking resources.
+ */
+static void ice_sf_dev_release(struct device *device)
+{
+	struct auxiliary_device *adev = to_auxiliary_dev(device);
+	struct ice_sf_dev *sf_dev = ice_adev_to_sf_dev(adev);
+
+	xa_erase(&ice_sf_aux_id, adev->id);
+	kfree(sf_dev);
+}
+
+/**
+ * ice_sf_eth_activate - Activate Ethernet subfunction port
+ * @dyn_port: the dynamic port instance for this subfunction
+ * @extack: extack for reporting error messages
+ *
+ * Activate the dynamic port as an Ethernet subfunction. Setup the netdev
+ * resources associated and initialize the auxiliary device.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+int
+ice_sf_eth_activate(struct ice_dynamic_port *dyn_port,
+		    struct netlink_ext_ack *extack)
+{
+	struct ice_pf *pf = dyn_port->pf;
+	struct ice_sf_dev *sf_dev;
+	struct pci_dev *pdev;
+	int err;
+	u32 id;
+
+	err = xa_alloc(&ice_sf_aux_id, &id, NULL, xa_limit_32b,
+		       GFP_KERNEL);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Could not allocate SF ID");
+		return err;
+	}
+
+	sf_dev = kzalloc(sizeof(*sf_dev), GFP_KERNEL);
+	if (!sf_dev) {
+		err = -ENOMEM;
+		NL_SET_ERR_MSG_MOD(extack, "Could not allocate SF memory");
+		goto xa_erase;
+	}
+	pdev = pf->pdev;
+
+	sf_dev->dyn_port = dyn_port;
+	sf_dev->adev.id = id;
+	sf_dev->adev.name = "sf";
+	sf_dev->adev.dev.release = ice_sf_dev_release;
+	sf_dev->adev.dev.parent = &pdev->dev;
+
+	err = auxiliary_device_init(&sf_dev->adev);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to initialize SF device");
+		goto sf_dev_free;
+	}
+
+	err = auxiliary_device_add(&sf_dev->adev);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to add SF device");
+		goto aux_dev_uninit;
+	}
+
+	dyn_port->sf_dev = sf_dev;
+
+	return 0;
+
+aux_dev_uninit:
+	auxiliary_device_uninit(&sf_dev->adev);
+sf_dev_free:
+	kfree(sf_dev);
+xa_erase:
+	xa_erase(&ice_sf_aux_id, id);
+
+	return err;
+}
+
+/**
+ * ice_sf_eth_deactivate - Deactivate Ethernet subfunction port
+ * @dyn_port: the dynamic port instance for this subfunction
+ *
+ * Deactivate the Ethernet subfunction, removing its auxiliary device and the
+ * associated resources.
+ */
+void ice_sf_eth_deactivate(struct ice_dynamic_port *dyn_port)
+{
+	struct ice_sf_dev *sf_dev = dyn_port->sf_dev;
+
+	auxiliary_device_delete(&sf_dev->adev);
+	auxiliary_device_uninit(&sf_dev->adev);
 }

drivers/net/ethernet/intel/ice/ice_sf_eth.h

···
 int ice_sf_driver_register(void);
 void ice_sf_driver_unregister(void);
 
+int ice_sf_eth_activate(struct ice_dynamic_port *dyn_port,
+			struct netlink_ext_ack *extack);
+void ice_sf_eth_deactivate(struct ice_dynamic_port *dyn_port);
 #endif /* _ICE_SF_ETH_H_ */