| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * net/switchdev/switchdev.c - Switch device API |
| * Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us> |
| * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/init.h> |
| #include <linux/mutex.h> |
| #include <linux/notifier.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/if_bridge.h> |
| #include <linux/list.h> |
| #include <linux/workqueue.h> |
| #include <linux/if_vlan.h> |
| #include <linux/rtnetlink.h> |
| #include <net/switchdev.h> |
| |
| static LIST_HEAD(deferred); |
| static DEFINE_SPINLOCK(deferred_lock); |
| |
| typedef void switchdev_deferred_func_t(struct net_device *dev, |
| const void *data); |
| |
| struct switchdev_deferred_item { |
| struct list_head list; |
| struct net_device *dev; |
| switchdev_deferred_func_t *func; |
| unsigned long data[]; |
| }; |
| |
| static struct switchdev_deferred_item *switchdev_deferred_dequeue(void) |
| { |
| struct switchdev_deferred_item *dfitem; |
| |
| spin_lock_bh(&deferred_lock); |
| if (list_empty(&deferred)) { |
| dfitem = NULL; |
| goto unlock; |
| } |
| dfitem = list_first_entry(&deferred, |
| struct switchdev_deferred_item, list); |
| list_del(&dfitem->list); |
| unlock: |
| spin_unlock_bh(&deferred_lock); |
| return dfitem; |
| } |
| |
| /** |
| * switchdev_deferred_process - Process ops in deferred queue |
| * |
| * Called to flush the ops currently queued in deferred ops queue. |
| * rtnl_lock must be held. |
| */ |
| void switchdev_deferred_process(void) |
| { |
| struct switchdev_deferred_item *dfitem; |
| |
| ASSERT_RTNL(); |
| |
| while ((dfitem = switchdev_deferred_dequeue())) { |
| dfitem->func(dfitem->dev, dfitem->data); |
| dev_put(dfitem->dev); |
| kfree(dfitem); |
| } |
| } |
| EXPORT_SYMBOL_GPL(switchdev_deferred_process); |
| |
| static void switchdev_deferred_process_work(struct work_struct *work) |
| { |
| rtnl_lock(); |
| switchdev_deferred_process(); |
| rtnl_unlock(); |
| } |
| |
| static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work); |
| |
| static int switchdev_deferred_enqueue(struct net_device *dev, |
| const void *data, size_t data_len, |
| switchdev_deferred_func_t *func) |
| { |
| struct switchdev_deferred_item *dfitem; |
| |
| dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC); |
| if (!dfitem) |
| return -ENOMEM; |
| dfitem->dev = dev; |
| dfitem->func = func; |
| memcpy(dfitem->data, data, data_len); |
| dev_hold(dev); |
| spin_lock_bh(&deferred_lock); |
| list_add_tail(&dfitem->list, &deferred); |
| spin_unlock_bh(&deferred_lock); |
| schedule_work(&deferred_process_work); |
| return 0; |
| } |
| |
| static int switchdev_port_attr_notify(enum switchdev_notifier_type nt, |
| struct net_device *dev, |
| const struct switchdev_attr *attr, |
| struct netlink_ext_ack *extack) |
| { |
| int err; |
| int rc; |
| |
| struct switchdev_notifier_port_attr_info attr_info = { |
| .attr = attr, |
| .handled = false, |
| }; |
| |
| rc = call_switchdev_blocking_notifiers(nt, dev, |
| &attr_info.info, extack); |
| err = notifier_to_errno(rc); |
| if (err) { |
| WARN_ON(!attr_info.handled); |
| return err; |
| } |
| |
| if (!attr_info.handled) |
| return -EOPNOTSUPP; |
| |
| return 0; |
| } |
| |
| static int switchdev_port_attr_set_now(struct net_device *dev, |
| const struct switchdev_attr *attr, |
| struct netlink_ext_ack *extack) |
| { |
| return switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr, |
| extack); |
| } |
| |
| static void switchdev_port_attr_set_deferred(struct net_device *dev, |
| const void *data) |
| { |
| const struct switchdev_attr *attr = data; |
| int err; |
| |
| err = switchdev_port_attr_set_now(dev, attr, NULL); |
| if (err && err != -EOPNOTSUPP) |
| netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n", |
| err, attr->id); |
| if (attr->complete) |
| attr->complete(dev, err, attr->complete_priv); |
| } |
| |
| static int switchdev_port_attr_set_defer(struct net_device *dev, |
| const struct switchdev_attr *attr) |
| { |
| return switchdev_deferred_enqueue(dev, attr, sizeof(*attr), |
| switchdev_port_attr_set_deferred); |
| } |
| |
| /** |
| * switchdev_port_attr_set - Set port attribute |
| * |
| * @dev: port device |
| * @attr: attribute to set |
| * @extack: netlink extended ack, for error message propagation |
| * |
| * rtnl_lock must be held and must not be in atomic section, |
| * in case SWITCHDEV_F_DEFER flag is not set. |
| */ |
| int switchdev_port_attr_set(struct net_device *dev, |
| const struct switchdev_attr *attr, |
| struct netlink_ext_ack *extack) |
| { |
| if (attr->flags & SWITCHDEV_F_DEFER) |
| return switchdev_port_attr_set_defer(dev, attr); |
| ASSERT_RTNL(); |
| return switchdev_port_attr_set_now(dev, attr, extack); |
| } |
| EXPORT_SYMBOL_GPL(switchdev_port_attr_set); |
| |
| static size_t switchdev_obj_size(const struct switchdev_obj *obj) |
| { |
| switch (obj->id) { |
| case SWITCHDEV_OBJ_ID_PORT_VLAN: |
| return sizeof(struct switchdev_obj_port_vlan); |
| case SWITCHDEV_OBJ_ID_PORT_MDB: |
| return sizeof(struct switchdev_obj_port_mdb); |
| case SWITCHDEV_OBJ_ID_HOST_MDB: |
| return sizeof(struct switchdev_obj_port_mdb); |
| default: |
| BUG(); |
| } |
| return 0; |
| } |
| |
| static int switchdev_port_obj_notify(enum switchdev_notifier_type nt, |
| struct net_device *dev, |
| const struct switchdev_obj *obj, |
| struct netlink_ext_ack *extack) |
| { |
| int rc; |
| int err; |
| |
| struct switchdev_notifier_port_obj_info obj_info = { |
| .obj = obj, |
| .handled = false, |
| }; |
| |
| rc = call_switchdev_blocking_notifiers(nt, dev, &obj_info.info, extack); |
| err = notifier_to_errno(rc); |
| if (err) { |
| WARN_ON(!obj_info.handled); |
| return err; |
| } |
| if (!obj_info.handled) |
| return -EOPNOTSUPP; |
| return 0; |
| } |
| |
| static void switchdev_port_obj_add_deferred(struct net_device *dev, |
| const void *data) |
| { |
| const struct switchdev_obj *obj = data; |
| int err; |
| |
| ASSERT_RTNL(); |
| err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, |
| dev, obj, NULL); |
| if (err && err != -EOPNOTSUPP) |
| netdev_err(dev, "failed (err=%d) to add object (id=%d)\n", |
| err, obj->id); |
| if (obj->complete) |
| obj->complete(dev, err, obj->complete_priv); |
| } |
| |
| static int switchdev_port_obj_add_defer(struct net_device *dev, |
| const struct switchdev_obj *obj) |
| { |
| return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj), |
| switchdev_port_obj_add_deferred); |
| } |
| |
| /** |
| * switchdev_port_obj_add - Add port object |
| * |
| * @dev: port device |
| * @obj: object to add |
| * @extack: netlink extended ack |
| * |
| * rtnl_lock must be held and must not be in atomic section, |
| * in case SWITCHDEV_F_DEFER flag is not set. |
| */ |
| int switchdev_port_obj_add(struct net_device *dev, |
| const struct switchdev_obj *obj, |
| struct netlink_ext_ack *extack) |
| { |
| if (obj->flags & SWITCHDEV_F_DEFER) |
| return switchdev_port_obj_add_defer(dev, obj); |
| ASSERT_RTNL(); |
| return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, |
| dev, obj, extack); |
| } |
| EXPORT_SYMBOL_GPL(switchdev_port_obj_add); |
| |
| static int switchdev_port_obj_del_now(struct net_device *dev, |
| const struct switchdev_obj *obj) |
| { |
| return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_DEL, |
| dev, obj, NULL); |
| } |
| |
| static void switchdev_port_obj_del_deferred(struct net_device *dev, |
| const void *data) |
| { |
| const struct switchdev_obj *obj = data; |
| int err; |
| |
| err = switchdev_port_obj_del_now(dev, obj); |
| if (err && err != -EOPNOTSUPP) |
| netdev_err(dev, "failed (err=%d) to del object (id=%d)\n", |
| err, obj->id); |
| if (obj->complete) |
| obj->complete(dev, err, obj->complete_priv); |
| } |
| |
| static int switchdev_port_obj_del_defer(struct net_device *dev, |
| const struct switchdev_obj *obj) |
| { |
| return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj), |
| switchdev_port_obj_del_deferred); |
| } |
| |
| /** |
| * switchdev_port_obj_del - Delete port object |
| * |
| * @dev: port device |
| * @obj: object to delete |
| * |
| * rtnl_lock must be held and must not be in atomic section, |
| * in case SWITCHDEV_F_DEFER flag is not set. |
| */ |
| int switchdev_port_obj_del(struct net_device *dev, |
| const struct switchdev_obj *obj) |
| { |
| if (obj->flags & SWITCHDEV_F_DEFER) |
| return switchdev_port_obj_del_defer(dev, obj); |
| ASSERT_RTNL(); |
| return switchdev_port_obj_del_now(dev, obj); |
| } |
| EXPORT_SYMBOL_GPL(switchdev_port_obj_del); |
| |
| static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain); |
| static BLOCKING_NOTIFIER_HEAD(switchdev_blocking_notif_chain); |
| |
| /** |
| * register_switchdev_notifier - Register notifier |
| * @nb: notifier_block |
| * |
| * Register switch device notifier. |
| */ |
| int register_switchdev_notifier(struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_register(&switchdev_notif_chain, nb); |
| } |
| EXPORT_SYMBOL_GPL(register_switchdev_notifier); |
| |
| /** |
| * unregister_switchdev_notifier - Unregister notifier |
| * @nb: notifier_block |
| * |
| * Unregister switch device notifier. |
| */ |
| int unregister_switchdev_notifier(struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb); |
| } |
| EXPORT_SYMBOL_GPL(unregister_switchdev_notifier); |
| |
| /** |
| * call_switchdev_notifiers - Call notifiers |
| * @val: value passed unmodified to notifier function |
| * @dev: port device |
| * @info: notifier information data |
| * @extack: netlink extended ack |
| * Call all network notifier blocks. |
| */ |
| int call_switchdev_notifiers(unsigned long val, struct net_device *dev, |
| struct switchdev_notifier_info *info, |
| struct netlink_ext_ack *extack) |
| { |
| info->dev = dev; |
| info->extack = extack; |
| return atomic_notifier_call_chain(&switchdev_notif_chain, val, info); |
| } |
| EXPORT_SYMBOL_GPL(call_switchdev_notifiers); |
| |
| int register_switchdev_blocking_notifier(struct notifier_block *nb) |
| { |
| struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain; |
| |
| return blocking_notifier_chain_register(chain, nb); |
| } |
| EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier); |
| |
| int unregister_switchdev_blocking_notifier(struct notifier_block *nb) |
| { |
| struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain; |
| |
| return blocking_notifier_chain_unregister(chain, nb); |
| } |
| EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier); |
| |
| int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev, |
| struct switchdev_notifier_info *info, |
| struct netlink_ext_ack *extack) |
| { |
| info->dev = dev; |
| info->extack = extack; |
| return blocking_notifier_call_chain(&switchdev_blocking_notif_chain, |
| val, info); |
| } |
| EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers); |
| |
| static int __switchdev_handle_port_obj_add(struct net_device *dev, |
| struct switchdev_notifier_port_obj_info *port_obj_info, |
| bool (*check_cb)(const struct net_device *dev), |
| int (*add_cb)(struct net_device *dev, const void *ctx, |
| const struct switchdev_obj *obj, |
| struct netlink_ext_ack *extack)) |
| { |
| struct switchdev_notifier_info *info = &port_obj_info->info; |
| struct netlink_ext_ack *extack; |
| struct net_device *lower_dev; |
| struct list_head *iter; |
| int err = -EOPNOTSUPP; |
| |
| extack = switchdev_notifier_info_to_extack(info); |
| |
| if (check_cb(dev)) { |
| err = add_cb(dev, info->ctx, port_obj_info->obj, extack); |
| if (err != -EOPNOTSUPP) |
| port_obj_info->handled = true; |
| return err; |
| } |
| |
| /* Switch ports might be stacked under e.g. a LAG. Ignore the |
| * unsupported devices, another driver might be able to handle them. But |
| * propagate to the callers any hard errors. |
| * |
| * If the driver does its own bookkeeping of stacked ports, it's not |
| * necessary to go through this helper. |
| */ |
| netdev_for_each_lower_dev(dev, lower_dev, iter) { |
| if (netif_is_bridge_master(lower_dev)) |
| continue; |
| |
| err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info, |
| check_cb, add_cb); |
| if (err && err != -EOPNOTSUPP) |
| return err; |
| } |
| |
| return err; |
| } |
| |
| int switchdev_handle_port_obj_add(struct net_device *dev, |
| struct switchdev_notifier_port_obj_info *port_obj_info, |
| bool (*check_cb)(const struct net_device *dev), |
| int (*add_cb)(struct net_device *dev, const void *ctx, |
| const struct switchdev_obj *obj, |
| struct netlink_ext_ack *extack)) |
| { |
| int err; |
| |
| err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb, |
| add_cb); |
| if (err == -EOPNOTSUPP) |
| err = 0; |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add); |
| |
| static int __switchdev_handle_port_obj_del(struct net_device *dev, |
| struct switchdev_notifier_port_obj_info *port_obj_info, |
| bool (*check_cb)(const struct net_device *dev), |
| int (*del_cb)(struct net_device *dev, const void *ctx, |
| const struct switchdev_obj *obj)) |
| { |
| struct switchdev_notifier_info *info = &port_obj_info->info; |
| struct net_device *lower_dev; |
| struct list_head *iter; |
| int err = -EOPNOTSUPP; |
| |
| if (check_cb(dev)) { |
| err = del_cb(dev, info->ctx, port_obj_info->obj); |
| if (err != -EOPNOTSUPP) |
| port_obj_info->handled = true; |
| return err; |
| } |
| |
| /* Switch ports might be stacked under e.g. a LAG. Ignore the |
| * unsupported devices, another driver might be able to handle them. But |
| * propagate to the callers any hard errors. |
| * |
| * If the driver does its own bookkeeping of stacked ports, it's not |
| * necessary to go through this helper. |
| */ |
| netdev_for_each_lower_dev(dev, lower_dev, iter) { |
| if (netif_is_bridge_master(lower_dev)) |
| continue; |
| |
| err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info, |
| check_cb, del_cb); |
| if (err && err != -EOPNOTSUPP) |
| return err; |
| } |
| |
| return err; |
| } |
| |
| int switchdev_handle_port_obj_del(struct net_device *dev, |
| struct switchdev_notifier_port_obj_info *port_obj_info, |
| bool (*check_cb)(const struct net_device *dev), |
| int (*del_cb)(struct net_device *dev, const void *ctx, |
| const struct switchdev_obj *obj)) |
| { |
| int err; |
| |
| err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb, |
| del_cb); |
| if (err == -EOPNOTSUPP) |
| err = 0; |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del); |
| |
| static int __switchdev_handle_port_attr_set(struct net_device *dev, |
| struct switchdev_notifier_port_attr_info *port_attr_info, |
| bool (*check_cb)(const struct net_device *dev), |
| int (*set_cb)(struct net_device *dev, const void *ctx, |
| const struct switchdev_attr *attr, |
| struct netlink_ext_ack *extack)) |
| { |
| struct switchdev_notifier_info *info = &port_attr_info->info; |
| struct netlink_ext_ack *extack; |
| struct net_device *lower_dev; |
| struct list_head *iter; |
| int err = -EOPNOTSUPP; |
| |
| extack = switchdev_notifier_info_to_extack(info); |
| |
| if (check_cb(dev)) { |
| err = set_cb(dev, info->ctx, port_attr_info->attr, extack); |
| if (err != -EOPNOTSUPP) |
| port_attr_info->handled = true; |
| return err; |
| } |
| |
| /* Switch ports might be stacked under e.g. a LAG. Ignore the |
| * unsupported devices, another driver might be able to handle them. But |
| * propagate to the callers any hard errors. |
| * |
| * If the driver does its own bookkeeping of stacked ports, it's not |
| * necessary to go through this helper. |
| */ |
| netdev_for_each_lower_dev(dev, lower_dev, iter) { |
| if (netif_is_bridge_master(lower_dev)) |
| continue; |
| |
| err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info, |
| check_cb, set_cb); |
| if (err && err != -EOPNOTSUPP) |
| return err; |
| } |
| |
| return err; |
| } |
| |
| int switchdev_handle_port_attr_set(struct net_device *dev, |
| struct switchdev_notifier_port_attr_info *port_attr_info, |
| bool (*check_cb)(const struct net_device *dev), |
| int (*set_cb)(struct net_device *dev, const void *ctx, |
| const struct switchdev_attr *attr, |
| struct netlink_ext_ack *extack)) |
| { |
| int err; |
| |
| err = __switchdev_handle_port_attr_set(dev, port_attr_info, check_cb, |
| set_cb); |
| if (err == -EOPNOTSUPP) |
| err = 0; |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(switchdev_handle_port_attr_set); |