From ae3bbc04d4bfef5d0332cd4edda3ac8f714cea23 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Thu, 29 Sep 2022 09:28:58 +0200 Subject: [PATCH] net: devlink: add port_init/fini() helpers to allow pre-register/post-unregister functions Lifetime of some of the devlink objects, like regions, is currently forced to be different for devlink instance and devlink port instance (per-port regions). The reason is that for devlink ports, the internal structures initialization happens only after devlink_port_register() is called. To resolve this inconsistency, 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 Signed-off-by: Jakub Kicinski --- 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);