/* * 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> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #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[0];}; 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 switchdev_trans *trans){ int err; int rc; struct switchdev_notifier_port_attr_info attr_info = { .attr = attr, .trans = trans, .handled = false, }; rc = call_switchdev_blocking_notifiers(nt, dev, &attr_info.info, NULL); 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 switchdev_trans trans; int err; /* Phase I: prepare for attr set. Driver/device should fail * here if there are going to be issues in the commit phase, * such as lack of resources or support. The driver/device * should reserve resources needed for the commit phase here, * but should not commit the attr. */ trans.ph_prepare = true; err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr, &trans); if (err) return err; /* Phase II: commit attr set. This cannot fail as a fault * of driver/device. If it does, it's a bug in the driver/device * because the driver said everythings was OK in phase I. */ trans.ph_prepare = false; err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr, &trans); WARN(err, "%s: Commit of attribute (id=%d) failed.\n", dev->name, attr->id); return err;} 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); 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 * * Use a 2-phase prepare-commit transaction model to ensure * system is not left in a partially updated state due to * failure from driver/device. * * 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){ if (attr->flags & SWITCHDEV_F_DEFER) return switchdev_port_attr_set_defer(dev, attr); ASSERT_RTNL(); return switchdev_port_attr_set_now(dev, attr);}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 switchdev_trans *trans, struct netlink_ext_ack *extack){ int rc; int err; struct switchdev_notifier_port_obj_info obj_info = { .obj = obj, .trans = trans, .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 int switchdev_port_obj_add_now(struct net_device *dev, const struct switchdev_obj *obj, struct netlink_ext_ack *extack){ struct switchdev_trans trans; int err; ASSERT_RTNL(); /* Phase I: prepare for obj add. Driver/device should fail * here if there are going to be issues in the commit phase, * such as lack of resources or support. The driver/device * should reserve resources needed for the commit phase here, * but should not commit the obj. */ trans.ph_prepare = true; err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, dev, obj, &trans, extack); if (err) return err; /* Phase II: commit obj add. This cannot fail as a fault * of driver/device. If it does, it's a bug in the driver/device * because the driver said everythings was OK in phase I. */ trans.ph_prepare = false; err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, dev, obj, &trans, extack); WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id); return err;} static void switchdev_port_obj_add_deferred(struct net_device *dev, const void *data){ const struct switchdev_obj *obj = data; int err; err = switchdev_port_obj_add_now(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 * @id: object ID * @obj: object to add * * Use a 2-phase prepare-commit transaction model to ensure * system is not left in a partially updated state due to * failure from driver/device. * * 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_add_now(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, 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 * @id: object ID * @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 * * 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 struct switchdev_obj *obj, struct switchdev_trans *trans, struct netlink_ext_ack *extack)){ struct netlink_ext_ack *extack; struct net_device *lower_dev; struct list_head *iter; int err = -EOPNOTSUPP; extack = switchdev_notifier_info_to_extack(&port_obj_info->info); if (check_cb(dev)) { /* This flag is only checked if the return value is success. */ port_obj_info->handled = true; return add_cb(dev, port_obj_info->obj, port_obj_info->trans, extack); } /* 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) { 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 struct switchdev_obj *obj, struct switchdev_trans *trans, struct netlink_ext_ack *extack)){ int err; Lines 1–500 of 607. Load more
/* * 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> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #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[0]; }; 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 switchdev_trans *trans) { int err; int rc; struct switchdev_notifier_port_attr_info attr_info = { .attr = attr, .trans = trans, .handled = false, }; rc = call_switchdev_blocking_notifiers(nt, dev, &attr_info.info, NULL); 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 switchdev_trans trans; int err; /* Phase I: prepare for attr set. Driver/device should fail * here if there are going to be issues in the commit phase, * such as lack of resources or support. The driver/device * should reserve resources needed for the commit phase here, * but should not commit the attr. */ trans.ph_prepare = true; err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr, &trans); if (err) return err; /* Phase II: commit attr set. This cannot fail as a fault * of driver/device. If it does, it's a bug in the driver/device * because the driver said everythings was OK in phase I. */ trans.ph_prepare = false; err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr, &trans); WARN(err, "%s: Commit of attribute (id=%d) failed.\n", dev->name, attr->id); return err; } 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); 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 * * Use a 2-phase prepare-commit transaction model to ensure * system is not left in a partially updated state due to * failure from driver/device. * * 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) { if (attr->flags & SWITCHDEV_F_DEFER) return switchdev_port_attr_set_defer(dev, attr); ASSERT_RTNL(); return switchdev_port_attr_set_now(dev, attr); } 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 switchdev_trans *trans, struct netlink_ext_ack *extack) { int rc; int err; struct switchdev_notifier_port_obj_info obj_info = { .obj = obj, .trans = trans, .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 int switchdev_port_obj_add_now(struct net_device *dev, const struct switchdev_obj *obj, struct netlink_ext_ack *extack) { struct switchdev_trans trans; int err; ASSERT_RTNL(); /* Phase I: prepare for obj add. Driver/device should fail * here if there are going to be issues in the commit phase, * such as lack of resources or support. The driver/device * should reserve resources needed for the commit phase here, * but should not commit the obj. */ trans.ph_prepare = true; err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, dev, obj, &trans, extack); if (err) return err; /* Phase II: commit obj add. This cannot fail as a fault * of driver/device. If it does, it's a bug in the driver/device * because the driver said everythings was OK in phase I. */ trans.ph_prepare = false; err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, dev, obj, &trans, extack); WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id); return err; } static void switchdev_port_obj_add_deferred(struct net_device *dev, const void *data) { const struct switchdev_obj *obj = data; int err; err = switchdev_port_obj_add_now(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 * @id: object ID * @obj: object to add * * Use a 2-phase prepare-commit transaction model to ensure * system is not left in a partially updated state due to * failure from driver/device. * * 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_add_now(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, 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 * @id: object ID * @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 * * 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 struct switchdev_obj *obj, struct switchdev_trans *trans, struct netlink_ext_ack *extack)) { struct netlink_ext_ack *extack; struct net_device *lower_dev; struct list_head *iter; int err = -EOPNOTSUPP; extack = switchdev_notifier_info_to_extack(&port_obj_info->info); if (check_cb(dev)) { /* This flag is only checked if the return value is success. */ port_obj_info->handled = true; return add_cb(dev, port_obj_info->obj, port_obj_info->trans, extack); } /* 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) { 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 struct switchdev_obj *obj, struct switchdev_trans *trans, struct netlink_ext_ack *extack)) { int err;