netdev - [patch net-next v2 3/7] net: devlink: add port_init/fini() helpers to allow pre-register/post-unregister functions

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Date:   Tue, 27 Sep 2022 09:56:41 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, olteanv@...il.com, tariqt@...dia.com,
        moshe@...dia.com, saeedm@...dia.com
Subject: [patch net-next v2 3/7] net: devlink: add port_init/fini() helpers to allow pre-register/post-unregister functions

From: Jiri Pirko <jiri@...dia.com>

To be consistent with devlink regions, devlink port regions are going to
be forbidden to be created once devlink port is registered. Prepare for
this and introduce new set of helpers to allow driver to initialize
devlink pointer and region list before devlink_register() is called
That allows port regions to be created before devlink port registration
and destroyed after devlink port unregistration.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 include/net/devlink.h |  6 +++++-
 net/core/devlink.c    | 46 ++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index bcacd8dab297..ba6b8b094943 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -130,7 +130,8 @@ struct devlink_port {
 	struct devlink_port_attrs attrs;
 	u8 attrs_set:1,
 	   switch_port:1,
-	   registered:1;
+	   registered:1,
+	   initialized:1;
 	struct delayed_work type_warn_dw;
 	struct list_head reporter_list;
 	struct mutex reporters_lock; /* Protects reporter_list */
@@ -1563,6 +1564,9 @@ void devlink_set_features(struct devlink *devlink, u64 features);
 void devlink_register(struct devlink *devlink);
 void devlink_unregister(struct devlink *devlink);
 void devlink_free(struct devlink *devlink);
+void devlink_port_init(struct devlink *devlink,
+		       struct devlink_port *devlink_port);
+void devlink_port_fini(struct devlink_port *devlink_port);
 int devl_port_register(struct devlink *devlink,
 		       struct devlink_port *devlink_port,
 		       unsigned int port_index);
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 17529e6b2bbf..89baa7c0938b 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -375,6 +375,8 @@ static struct devlink *devlink_get_from_attrs(struct net *net,
 	WARN_ON_ONCE(!(devlink_port)->registered)
 #define ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port)			\
 	WARN_ON_ONCE((devlink_port)->registered)
+#define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port)				\
+	WARN_ON_ONCE(!(devlink_port)->initialized)
 
 static struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
 						      unsigned int port_index)
@@ -9852,6 +9854,44 @@ static void devlink_port_type_warn_cancel(struct devlink_port *devlink_port)
 	cancel_delayed_work_sync(&devlink_port->type_warn_dw);
 }
 
+/**
+ * devlink_port_init() - Init devlink port
+ *
+ * @devlink: devlink
+ * @devlink_port: devlink port
+ *
+ * Initialize essencial stuff that is needed for functions
+ * that may be called before devlink port registration.
+ * Call to this function is optional and not needed
+ * in case the driver does not use such functions.
+ */
+void devlink_port_init(struct devlink *devlink,
+		       struct devlink_port *devlink_port)
+{
+	if (devlink_port->initialized)
+		return;
+	devlink_port->devlink = devlink;
+	INIT_LIST_HEAD(&devlink_port->region_list);
+	devlink_port->initialized = true;
+}
+EXPORT_SYMBOL_GPL(devlink_port_init);
+
+/**
+ * devlink_port_fini() - Deinitialize devlink port
+ *
+ * @devlink_port: devlink port
+ *
+ * Deinitialize essencial stuff that is in use for functions
+ * that may be called after devlink port unregistration.
+ * Call to this function is optional and not needed
+ * in case the driver does not use such functions.
+ */
+void devlink_port_fini(struct devlink_port *devlink_port)
+{
+	WARN_ON(!list_empty(&devlink_port->region_list));
+}
+EXPORT_SYMBOL_GPL(devlink_port_fini);
+
 /**
  * devl_port_register() - Register devlink port
  *
@@ -9876,14 +9916,13 @@ int devl_port_register(struct devlink *devlink,
 
 	ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port);
 
+	devlink_port_init(devlink, devlink_port);
 	devlink_port->registered = true;
-	devlink_port->devlink = devlink;
 	devlink_port->index = port_index;
 	spin_lock_init(&devlink_port->type_lock);
 	INIT_LIST_HEAD(&devlink_port->reporter_list);
 	mutex_init(&devlink_port->reporters_lock);
 	list_add_tail(&devlink_port->list, &devlink->port_list);
-	INIT_LIST_HEAD(&devlink_port->region_list);
 
 	INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);
 	devlink_port_type_warn_schedule(devlink_port);
@@ -9933,7 +9972,6 @@ void devl_port_unregister(struct devlink_port *devlink_port)
 	devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_DEL);
 	list_del(&devlink_port->list);
 	WARN_ON(!list_empty(&devlink_port->reporter_list));
-	WARN_ON(!list_empty(&devlink_port->region_list));
 	mutex_destroy(&devlink_port->reporters_lock);
 	devlink_port->registered = false;
 }
@@ -11347,6 +11385,8 @@ devlink_port_region_create(struct devlink_port *port,
 	struct devlink_region *region;
 	int err = 0;
 
+	ASSERT_DEVLINK_PORT_INITIALIZED(port);
+
 	if (WARN_ON(!ops) || WARN_ON(!ops->destructor))
 		return ERR_PTR(-EINVAL);
 
-- 
2.37.1