// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (c) 2016 Mellanox Technologies. All rights reserved. * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> */ #include <net/genetlink.h>#define CREATE_TRACE_POINTS#include <trace/events/devlink.h> #include "devl_internal.h" EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwmsg);EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwerr);EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_trap_report); DEFINE_XARRAY_FLAGS(devlinks, XA_FLAGS_ALLOC); void *devlink_priv(struct devlink *devlink){	return &devlink->priv;}EXPORT_SYMBOL_GPL(devlink_priv); struct devlink *priv_to_devlink(void *priv){	return container_of(priv, struct devlink, priv);}EXPORT_SYMBOL_GPL(priv_to_devlink); struct device *devlink_to_dev(const struct devlink *devlink){	return devlink->dev;}EXPORT_SYMBOL_GPL(devlink_to_dev); struct net *devlink_net(const struct devlink *devlink){	return read_pnet(&devlink->_net);}EXPORT_SYMBOL_GPL(devlink_net); void devl_assert_locked(struct devlink *devlink){	lockdep_assert_held(&devlink->lock);}EXPORT_SYMBOL_GPL(devl_assert_locked); #ifdef CONFIG_LOCKDEP/* For use in conjunction with LOCKDEP only e.g. rcu_dereference_protected() */bool devl_lock_is_held(struct devlink *devlink){	return lockdep_is_held(&devlink->lock);}EXPORT_SYMBOL_GPL(devl_lock_is_held);#endif void devl_lock(struct devlink *devlink){	mutex_lock(&devlink->lock);}EXPORT_SYMBOL_GPL(devl_lock); int devl_trylock(struct devlink *devlink){	return mutex_trylock(&devlink->lock);}EXPORT_SYMBOL_GPL(devl_trylock); void devl_unlock(struct devlink *devlink){	mutex_unlock(&devlink->lock);}EXPORT_SYMBOL_GPL(devl_unlock); /** * devlink_try_get() - try to obtain a reference on a devlink instance * @devlink: instance to reference * * Obtain a reference on a devlink instance. A reference on a devlink instance * only implies that it's safe to take the instance lock. It does not imply * that the instance is registered, use devl_is_registered() after taking * the instance lock to check registration status. */struct devlink *__must_check devlink_try_get(struct devlink *devlink){	if (refcount_inc_not_zero(&devlink->refcount))		return devlink;	return NULL;} static void devlink_release(struct work_struct *work){	struct devlink *devlink; 	devlink = container_of(to_rcu_work(work), struct devlink, rwork); 	mutex_destroy(&devlink->lock);	lockdep_unregister_key(&devlink->lock_key);	kfree(devlink);} void devlink_put(struct devlink *devlink){	if (refcount_dec_and_test(&devlink->refcount))		queue_rcu_work(system_wq, &devlink->rwork);} struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp){	struct devlink *devlink = NULL; 	rcu_read_lock();retry:	devlink = xa_find(&devlinks, indexp, ULONG_MAX, DEVLINK_REGISTERED);	if (!devlink)		goto unlock; 	if (!devlink_try_get(devlink))		goto next;	if (!net_eq(devlink_net(devlink), net)) {		devlink_put(devlink);		goto next;	}unlock:	rcu_read_unlock();	return devlink; next:	(*indexp)++;	goto retry;} /** * devl_register - Register devlink instance * @devlink: devlink */int devl_register(struct devlink *devlink){	ASSERT_DEVLINK_NOT_REGISTERED(devlink);	devl_assert_locked(devlink); 	xa_set_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);	devlink_notify_register(devlink); 	return 0;}EXPORT_SYMBOL_GPL(devl_register); void devlink_register(struct devlink *devlink){	devl_lock(devlink);	devl_register(devlink);	devl_unlock(devlink);}EXPORT_SYMBOL_GPL(devlink_register); /** * devl_unregister - Unregister devlink instance * @devlink: devlink */void devl_unregister(struct devlink *devlink){	ASSERT_DEVLINK_REGISTERED(devlink);	devl_assert_locked(devlink); 	devlink_notify_unregister(devlink);	xa_clear_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);}EXPORT_SYMBOL_GPL(devl_unregister); void devlink_unregister(struct devlink *devlink){	devl_lock(devlink);	devl_unregister(devlink);	devl_unlock(devlink);}EXPORT_SYMBOL_GPL(devlink_unregister); /** *	devlink_alloc_ns - Allocate new devlink instance resources *	in specific namespace * *	@ops: ops *	@priv_size: size of user private data *	@net: net namespace *	@dev: parent device * *	Allocate new devlink instance resources, including devlink index *	and name. */struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,				 size_t priv_size, struct net *net,				 struct device *dev){	struct devlink *devlink;	static u32 last_id;	int ret; 	WARN_ON(!ops || !dev);	if (!devlink_reload_actions_valid(ops))		return NULL; 	devlink = kzalloc(sizeof(*devlink) + priv_size, GFP_KERNEL);	if (!devlink)		return NULL; 	ret = xa_alloc_cyclic(&devlinks, &devlink->index, devlink, xa_limit_31b,			      &last_id, GFP_KERNEL);	if (ret < 0)		goto err_xa_alloc; 	devlink->dev = dev;	devlink->ops = ops;	xa_init_flags(&devlink->ports, XA_FLAGS_ALLOC);	xa_init_flags(&devlink->params, XA_FLAGS_ALLOC);	xa_init_flags(&devlink->snapshot_ids, XA_FLAGS_ALLOC);	write_pnet(&devlink->_net, net);	INIT_LIST_HEAD(&devlink->rate_list);	INIT_LIST_HEAD(&devlink->linecard_list);	INIT_LIST_HEAD(&devlink->sb_list);	INIT_LIST_HEAD_RCU(&devlink->dpipe_table_list);	INIT_LIST_HEAD(&devlink->resource_list);	INIT_LIST_HEAD(&devlink->region_list);	INIT_LIST_HEAD(&devlink->reporter_list);	INIT_LIST_HEAD(&devlink->trap_list);	INIT_LIST_HEAD(&devlink->trap_group_list);	INIT_LIST_HEAD(&devlink->trap_policer_list);	INIT_RCU_WORK(&devlink->rwork, devlink_release);	lockdep_register_key(&devlink->lock_key);	mutex_init(&devlink->lock);	lockdep_set_class(&devlink->lock, &devlink->lock_key);	refcount_set(&devlink->refcount, 1); 	return devlink; err_xa_alloc:	kfree(devlink);	return NULL;}EXPORT_SYMBOL_GPL(devlink_alloc_ns); /** *	devlink_free - Free devlink instance resources * *	@devlink: devlink */void devlink_free(struct devlink *devlink){	ASSERT_DEVLINK_NOT_REGISTERED(devlink); 	WARN_ON(!list_empty(&devlink->trap_policer_list));	WARN_ON(!list_empty(&devlink->trap_group_list));	WARN_ON(!list_empty(&devlink->trap_list));	WARN_ON(!list_empty(&devlink->reporter_list));	WARN_ON(!list_empty(&devlink->region_list));	WARN_ON(!list_empty(&devlink->resource_list));	WARN_ON(!list_empty(&devlink->dpipe_table_list));	WARN_ON(!list_empty(&devlink->sb_list));	WARN_ON(!list_empty(&devlink->rate_list));	WARN_ON(!list_empty(&devlink->linecard_list));	WARN_ON(!xa_empty(&devlink->ports)); 	xa_destroy(&devlink->snapshot_ids);	xa_destroy(&devlink->params);	xa_destroy(&devlink->ports); 	xa_erase(&devlinks, devlink->index); 	devlink_put(devlink);}EXPORT_SYMBOL_GPL(devlink_free); static void __net_exit devlink_pernet_pre_exit(struct net *net){	struct devlink *devlink;	u32 actions_performed;	unsigned long index;	int err; 	/* In case network namespace is getting destroyed, reload	 * all devlink instances from this namespace into init_net.	 */	devlinks_xa_for_each_registered_get(net, index, devlink) {		devl_lock(devlink);		err = 0;		if (devl_is_registered(devlink))			err = devlink_reload(devlink, &init_net,					     DEVLINK_RELOAD_ACTION_DRIVER_REINIT,					     DEVLINK_RELOAD_LIMIT_UNSPEC,					     &actions_performed, NULL);		devl_unlock(devlink);		devlink_put(devlink);		if (err && err != -EOPNOTSUPP)			pr_warn("Failed to reload devlink instance into init_net\n");	}} static struct pernet_operations devlink_pernet_ops __net_initdata = {	.pre_exit = devlink_pernet_pre_exit,}; static struct notifier_block devlink_port_netdevice_nb = {	.notifier_call = devlink_port_netdevice_event,}; static int __init devlink_init(void){	int err; 	err = genl_register_family(&devlink_nl_family);	if (err)		goto out;	err = register_pernet_subsys(&devlink_pernet_ops);	if (err)		goto out;	err = register_netdevice_notifier(&devlink_port_netdevice_nb); out:	WARN_ON(err);	return err;} subsys_initcall(devlink_init);