blob: f49cd83f1955f5ee3dc779dbd63afda808edf33f [file] [log] [blame]
// 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);
static struct devlink *devlinks_xa_get(unsigned long index)
{
struct devlink *devlink;
rcu_read_lock();
devlink = xa_find(&devlinks, &index, index, DEVLINK_REGISTERED);
if (!devlink || !devlink_try_get(devlink))
devlink = NULL;
rcu_read_unlock();
return devlink;
}
/* devlink_rels xarray contains 1:1 relationships between
* devlink object and related nested devlink instance.
* The xarray index is used to get the nested object from
* the nested-in object code.
*/
static DEFINE_XARRAY_FLAGS(devlink_rels, XA_FLAGS_ALLOC1);
#define DEVLINK_REL_IN_USE XA_MARK_0
struct devlink_rel {
u32 index;
refcount_t refcount;
u32 devlink_index;
struct {
u32 devlink_index;
u32 obj_index;
devlink_rel_notify_cb_t *notify_cb;
devlink_rel_cleanup_cb_t *cleanup_cb;
struct delayed_work notify_work;
} nested_in;
};
static void devlink_rel_free(struct devlink_rel *rel)
{
xa_erase(&devlink_rels, rel->index);
kfree(rel);
}
static void __devlink_rel_get(struct devlink_rel *rel)
{
refcount_inc(&rel->refcount);
}
static void __devlink_rel_put(struct devlink_rel *rel)
{
if (refcount_dec_and_test(&rel->refcount))
devlink_rel_free(rel);
}
static void devlink_rel_nested_in_notify_work(struct work_struct *work)
{
struct devlink_rel *rel = container_of(work, struct devlink_rel,
nested_in.notify_work.work);
struct devlink *devlink;
devlink = devlinks_xa_get(rel->nested_in.devlink_index);
if (!devlink)
goto rel_put;
if (!devl_trylock(devlink)) {
devlink_put(devlink);
goto reschedule_work;
}
if (!devl_is_registered(devlink)) {
devl_unlock(devlink);
devlink_put(devlink);
goto rel_put;
}
if (!xa_get_mark(&devlink_rels, rel->index, DEVLINK_REL_IN_USE))
rel->nested_in.cleanup_cb(devlink, rel->nested_in.obj_index, rel->index);
rel->nested_in.notify_cb(devlink, rel->nested_in.obj_index);
devl_unlock(devlink);
devlink_put(devlink);
rel_put:
__devlink_rel_put(rel);
return;
reschedule_work:
schedule_delayed_work(&rel->nested_in.notify_work, 1);
}
static void devlink_rel_nested_in_notify_work_schedule(struct devlink_rel *rel)
{
__devlink_rel_get(rel);
schedule_delayed_work(&rel->nested_in.notify_work, 0);
}
static struct devlink_rel *devlink_rel_alloc(void)
{
struct devlink_rel *rel;
static u32 next;
int err;
rel = kzalloc(sizeof(*rel), GFP_KERNEL);
if (!rel)
return ERR_PTR(-ENOMEM);
err = xa_alloc_cyclic(&devlink_rels, &rel->index, rel,
xa_limit_32b, &next, GFP_KERNEL);
if (err) {
kfree(rel);
return ERR_PTR(err);
}
refcount_set(&rel->refcount, 1);
INIT_DELAYED_WORK(&rel->nested_in.notify_work,
&devlink_rel_nested_in_notify_work);
return rel;
}
static void devlink_rel_put(struct devlink *devlink)
{
struct devlink_rel *rel = devlink->rel;
if (!rel)
return;
xa_clear_mark(&devlink_rels, rel->index, DEVLINK_REL_IN_USE);
devlink_rel_nested_in_notify_work_schedule(rel);
__devlink_rel_put(rel);
devlink->rel = NULL;
}
void devlink_rel_nested_in_clear(u32 rel_index)
{
xa_clear_mark(&devlink_rels, rel_index, DEVLINK_REL_IN_USE);
}
int devlink_rel_nested_in_add(u32 *rel_index, u32 devlink_index,
u32 obj_index, devlink_rel_notify_cb_t *notify_cb,
devlink_rel_cleanup_cb_t *cleanup_cb,
struct devlink *devlink)
{
struct devlink_rel *rel = devlink_rel_alloc();
ASSERT_DEVLINK_NOT_REGISTERED(devlink);
if (IS_ERR(rel))
return PTR_ERR(rel);
rel->devlink_index = devlink->index;
rel->nested_in.devlink_index = devlink_index;
rel->nested_in.obj_index = obj_index;
rel->nested_in.notify_cb = notify_cb;
rel->nested_in.cleanup_cb = cleanup_cb;
*rel_index = rel->index;
xa_set_mark(&devlink_rels, rel->index, DEVLINK_REL_IN_USE);
devlink->rel = rel;
return 0;
}
/**
* devlink_rel_nested_in_notify - Notify the object this devlink
* instance is nested in.
* @devlink: devlink
*
* This is called upon network namespace change of devlink instance.
* In case this devlink instance is nested in another devlink object,
* a notification of a change of this object should be sent
* over netlink. The parent devlink instance lock needs to be
* taken during the notification preparation.
* However, since the devlink lock of nested instance is held here,
* we would end with wrong devlink instance lock ordering and
* deadlock. Therefore the work is utilized to avoid that.
*/
void devlink_rel_nested_in_notify(struct devlink *devlink)
{
struct devlink_rel *rel = devlink->rel;
if (!rel)
return;
devlink_rel_nested_in_notify_work_schedule(rel);
}
static struct devlink_rel *devlink_rel_find(unsigned long rel_index)
{
return xa_find(&devlink_rels, &rel_index, rel_index,
DEVLINK_REL_IN_USE);
}
static struct devlink *devlink_rel_devlink_get(u32 rel_index)
{
struct devlink_rel *rel;
u32 devlink_index;
if (!rel_index)
return NULL;
xa_lock(&devlink_rels);
rel = devlink_rel_find(rel_index);
if (rel)
devlink_index = rel->devlink_index;
xa_unlock(&devlink_rels);
if (!rel)
return NULL;
return devlinks_xa_get(devlink_index);
}
int devlink_rel_devlink_handle_put(struct sk_buff *msg, struct devlink *devlink,
u32 rel_index, int attrtype,
bool *msg_updated)
{
struct net *net = devlink_net(devlink);
struct devlink *rel_devlink;
int err;
rel_devlink = devlink_rel_devlink_get(rel_index);
if (!rel_devlink)
return 0;
err = devlink_nl_put_nested_handle(msg, net, rel_devlink, attrtype);
devlink_put(rel_devlink);
if (!err && msg_updated)
*msg_updated = true;
return err;
}
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);
put_device(devlink->dev);
kvfree(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);
devlink_rel_nested_in_notify(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);
devlink_rel_put(devlink);
}
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 = kvzalloc(struct_size(devlink, priv, 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 = get_device(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);
xa_init_flags(&devlink->nested_rels, 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:
kvfree(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->nested_rels);
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_dev_lock(devlink, true);
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_dev_unlock(devlink, true);
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 = register_pernet_subsys(&devlink_pernet_ops);
if (err)
goto out;
err = genl_register_family(&devlink_nl_family);
if (err)
goto out_unreg_pernet_subsys;
err = register_netdevice_notifier(&devlink_port_netdevice_nb);
if (!err)
return 0;
genl_unregister_family(&devlink_nl_family);
out_unreg_pernet_subsys:
unregister_pernet_subsys(&devlink_pernet_ops);
out:
WARN_ON(err);
return err;
}
subsys_initcall(devlink_init);