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