devlink: implement line card active state

Allow driver to mark a line card as active. Expose this state to the
userspace over devlink netlink interface with proper notifications.
'active' state means that line card was plugged in after
being provisioned.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/devlink/devlink-linecard.rst

@@ -66,6 +66,7 @@ The ``devlink-linecard`` mechanism supports the following line card states:
     with a line card type.
   * ``provisioning_failed``: Provisioning was not successful.
   * ``provisioned``: Line card slot is provisioned with a type.
+  * ``active``: Line card is powered-up and active.
 
 The following diagram provides a general overview of ``devlink-linecard``
 state transitions::
@@ -85,11 +86,11 @@ state transitions::
        |                                               |
        |                 +-----------------------------+
        |                 |                             |
-       |    +------------v------------+   +------------v------------+
-       |    |                         |   |                         |
-       +-----   provisioning_failed   |   |       provisioned       |
-       |    |                         |   |                         |
-       |    +------------^------------+   +------------|------------+
+       |    +------------v------------+   +------------v------------+   +-------------------------+
+       |    |                         |   |                         ---->                         |
+       +-----   provisioning_failed   |   |       provisioned       |   |         active          |
+       |    |                         |   |                         <----                         |
+       |    +------------^------------+   +------------|------------+   +-------------------------+
        |                 |                             |
        |                 |                             |
        |                 |                +------------v------------+

include/net/devlink.h

@@ -1579,6 +1579,8 @@ void devlink_linecard_provision_set(struct devlink_linecard *linecard,
 				    const char *type);
 void devlink_linecard_provision_clear(struct devlink_linecard *linecard);
 void devlink_linecard_provision_fail(struct devlink_linecard *linecard);
+void devlink_linecard_activate(struct devlink_linecard *linecard);
+void devlink_linecard_deactivate(struct devlink_linecard *linecard);
 int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,
 			u32 size, u16 ingress_pools_count,
 			u16 egress_pools_count, u16 ingress_tc_count,

include/uapi/linux/devlink.h

@@ -350,6 +350,7 @@ enum devlink_linecard_state {
 	DEVLINK_LINECARD_STATE_PROVISIONING,
 	DEVLINK_LINECARD_STATE_PROVISIONING_FAILED,
 	DEVLINK_LINECARD_STATE_PROVISIONED,
+	DEVLINK_LINECARD_STATE_ACTIVE,
 
 	__DEVLINK_LINECARD_STATE_MAX,
 	DEVLINK_LINECARD_STATE_MAX = __DEVLINK_LINECARD_STATE_MAX - 1

net/core/devlink.c

@@ -10331,6 +10331,47 @@ void devlink_linecard_provision_fail(struct devlink_linecard *linecard)
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_provision_fail);
 
+/**
+ *	devlink_linecard_activate - Set linecard active
+ *
+ *	@linecard: devlink linecard
+ */
+void devlink_linecard_activate(struct devlink_linecard *linecard)
+{
+	mutex_lock(&linecard->state_lock);
+	WARN_ON(linecard->state != DEVLINK_LINECARD_STATE_PROVISIONED);
+	linecard->state = DEVLINK_LINECARD_STATE_ACTIVE;
+	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
+	mutex_unlock(&linecard->state_lock);
+}
+EXPORT_SYMBOL_GPL(devlink_linecard_activate);
+
+/**
+ *	devlink_linecard_deactivate - Set linecard inactive
+ *
+ *	@linecard: devlink linecard
+ */
+void devlink_linecard_deactivate(struct devlink_linecard *linecard)
+{
+	mutex_lock(&linecard->state_lock);
+	switch (linecard->state) {
+	case DEVLINK_LINECARD_STATE_ACTIVE:
+		linecard->state = DEVLINK_LINECARD_STATE_PROVISIONED;
+		devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
+		break;
+	case DEVLINK_LINECARD_STATE_UNPROVISIONING:
+		/* Line card is being deactivated as part
+		 * of unprovisioning flow.
+		 */
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+	mutex_unlock(&linecard->state_lock);
+}
+EXPORT_SYMBOL_GPL(devlink_linecard_deactivate);
+
 int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,
 			u32 size, u16 ingress_pools_count,
 			u16 egress_pools_count, u16 ingress_tc_count,