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-rw-r--r--net/switchdev/switchdev.c889
1 files changed, 889 insertions, 0 deletions
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
new file mode 100644
index 0000000000..5b04528484
--- /dev/null
+++ b/net/switchdev/switchdev.c
@@ -0,0 +1,889 @@
+// 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;
+ netdevice_tracker dev_tracker;
+ 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);
+ netdev_put(dfitem->dev, &dfitem->dev_tracker);
+ 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(struct_size(dfitem, data, data_len), GFP_ATOMIC);
+ if (!dfitem)
+ return -ENOMEM;
+ dfitem->dev = dev;
+ dfitem->func = func;
+ memcpy(dfitem->data, data, data_len);
+ netdev_hold(dev, &dfitem->dev_tracker, GFP_ATOMIC);
+ 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);
+
+struct switchdev_nested_priv {
+ bool (*check_cb)(const struct net_device *dev);
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_dev);
+ const struct net_device *dev;
+ struct net_device *lower_dev;
+};
+
+static int switchdev_lower_dev_walk(struct net_device *lower_dev,
+ struct netdev_nested_priv *priv)
+{
+ struct switchdev_nested_priv *switchdev_priv = priv->data;
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_dev);
+ bool (*check_cb)(const struct net_device *dev);
+ const struct net_device *dev;
+
+ check_cb = switchdev_priv->check_cb;
+ foreign_dev_check_cb = switchdev_priv->foreign_dev_check_cb;
+ dev = switchdev_priv->dev;
+
+ if (check_cb(lower_dev) && !foreign_dev_check_cb(lower_dev, dev)) {
+ switchdev_priv->lower_dev = lower_dev;
+ return 1;
+ }
+
+ return 0;
+}
+
+static struct net_device *
+switchdev_lower_dev_find_rcu(struct net_device *dev,
+ bool (*check_cb)(const struct net_device *dev),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_dev))
+{
+ struct switchdev_nested_priv switchdev_priv = {
+ .check_cb = check_cb,
+ .foreign_dev_check_cb = foreign_dev_check_cb,
+ .dev = dev,
+ .lower_dev = NULL,
+ };
+ struct netdev_nested_priv priv = {
+ .data = &switchdev_priv,
+ };
+
+ netdev_walk_all_lower_dev_rcu(dev, switchdev_lower_dev_walk, &priv);
+
+ return switchdev_priv.lower_dev;
+}
+
+static struct net_device *
+switchdev_lower_dev_find(struct net_device *dev,
+ bool (*check_cb)(const struct net_device *dev),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_dev))
+{
+ struct switchdev_nested_priv switchdev_priv = {
+ .check_cb = check_cb,
+ .foreign_dev_check_cb = foreign_dev_check_cb,
+ .dev = dev,
+ .lower_dev = NULL,
+ };
+ struct netdev_nested_priv priv = {
+ .data = &switchdev_priv,
+ };
+
+ netdev_walk_all_lower_dev(dev, switchdev_lower_dev_walk, &priv);
+
+ return switchdev_priv.lower_dev;
+}
+
+static int __switchdev_handle_fdb_event_to_device(struct net_device *dev,
+ struct net_device *orig_dev, unsigned long event,
+ const struct switchdev_notifier_fdb_info *fdb_info,
+ bool (*check_cb)(const struct net_device *dev),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_dev),
+ int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
+ unsigned long event, const void *ctx,
+ const struct switchdev_notifier_fdb_info *fdb_info))
+{
+ const struct switchdev_notifier_info *info = &fdb_info->info;
+ struct net_device *br, *lower_dev, *switchdev;
+ struct list_head *iter;
+ int err = -EOPNOTSUPP;
+
+ if (check_cb(dev))
+ return mod_cb(dev, orig_dev, event, info->ctx, fdb_info);
+
+ /* Recurse through lower interfaces in case the FDB entry is pointing
+ * towards a bridge or a LAG device.
+ */
+ netdev_for_each_lower_dev(dev, lower_dev, iter) {
+ /* Do not propagate FDB entries across bridges */
+ if (netif_is_bridge_master(lower_dev))
+ continue;
+
+ /* Bridge ports might be either us, or LAG interfaces
+ * that we offload.
+ */
+ if (!check_cb(lower_dev) &&
+ !switchdev_lower_dev_find_rcu(lower_dev, check_cb,
+ foreign_dev_check_cb))
+ continue;
+
+ err = __switchdev_handle_fdb_event_to_device(lower_dev, orig_dev,
+ event, fdb_info, check_cb,
+ foreign_dev_check_cb,
+ mod_cb);
+ if (err && err != -EOPNOTSUPP)
+ return err;
+ }
+
+ /* Event is neither on a bridge nor a LAG. Check whether it is on an
+ * interface that is in a bridge with us.
+ */
+ br = netdev_master_upper_dev_get_rcu(dev);
+ if (!br || !netif_is_bridge_master(br))
+ return 0;
+
+ switchdev = switchdev_lower_dev_find_rcu(br, check_cb, foreign_dev_check_cb);
+ if (!switchdev)
+ return 0;
+
+ if (!foreign_dev_check_cb(switchdev, dev))
+ return err;
+
+ return __switchdev_handle_fdb_event_to_device(br, orig_dev, event, fdb_info,
+ check_cb, foreign_dev_check_cb,
+ mod_cb);
+}
+
+int switchdev_handle_fdb_event_to_device(struct net_device *dev, unsigned long event,
+ const struct switchdev_notifier_fdb_info *fdb_info,
+ bool (*check_cb)(const struct net_device *dev),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_dev),
+ int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
+ unsigned long event, const void *ctx,
+ const struct switchdev_notifier_fdb_info *fdb_info))
+{
+ int err;
+
+ err = __switchdev_handle_fdb_event_to_device(dev, dev, event, fdb_info,
+ check_cb, foreign_dev_check_cb,
+ mod_cb);
+ if (err == -EOPNOTSUPP)
+ err = 0;
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(switchdev_handle_fdb_event_to_device);
+
+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),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_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 net_device *br, *lower_dev, *switchdev;
+ struct netlink_ext_ack *extack;
+ 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;
+
+ /* When searching for switchdev interfaces that are neighbors
+ * of foreign ones, and @dev is a bridge, do not recurse on the
+ * foreign interface again, it was already visited.
+ */
+ if (foreign_dev_check_cb && !check_cb(lower_dev) &&
+ !switchdev_lower_dev_find(lower_dev, check_cb, foreign_dev_check_cb))
+ continue;
+
+ err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
+ check_cb, foreign_dev_check_cb,
+ add_cb);
+ if (err && err != -EOPNOTSUPP)
+ return err;
+ }
+
+ /* Event is neither on a bridge nor a LAG. Check whether it is on an
+ * interface that is in a bridge with us.
+ */
+ if (!foreign_dev_check_cb)
+ return err;
+
+ br = netdev_master_upper_dev_get(dev);
+ if (!br || !netif_is_bridge_master(br))
+ return err;
+
+ switchdev = switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb);
+ if (!switchdev)
+ return err;
+
+ if (!foreign_dev_check_cb(switchdev, dev))
+ return err;
+
+ return __switchdev_handle_port_obj_add(br, port_obj_info, check_cb,
+ foreign_dev_check_cb, add_cb);
+}
+
+/* Pass through a port object addition, if @dev passes @check_cb, or replicate
+ * it towards all lower interfaces of @dev that pass @check_cb, if @dev is a
+ * bridge or a LAG.
+ */
+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,
+ NULL, add_cb);
+ if (err == -EOPNOTSUPP)
+ err = 0;
+ return err;
+}
+EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add);
+
+/* Same as switchdev_handle_port_obj_add(), except if object is notified on a
+ * @dev that passes @foreign_dev_check_cb, it is replicated towards all devices
+ * that pass @check_cb and are in the same bridge as @dev.
+ */
+int switchdev_handle_port_obj_add_foreign(struct net_device *dev,
+ struct switchdev_notifier_port_obj_info *port_obj_info,
+ bool (*check_cb)(const struct net_device *dev),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_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,
+ foreign_dev_check_cb, add_cb);
+ if (err == -EOPNOTSUPP)
+ err = 0;
+ return err;
+}
+EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add_foreign);
+
+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),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_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 *br, *lower_dev, *switchdev;
+ 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;
+
+ /* When searching for switchdev interfaces that are neighbors
+ * of foreign ones, and @dev is a bridge, do not recurse on the
+ * foreign interface again, it was already visited.
+ */
+ if (foreign_dev_check_cb && !check_cb(lower_dev) &&
+ !switchdev_lower_dev_find(lower_dev, check_cb, foreign_dev_check_cb))
+ continue;
+
+ err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
+ check_cb, foreign_dev_check_cb,
+ del_cb);
+ if (err && err != -EOPNOTSUPP)
+ return err;
+ }
+
+ /* Event is neither on a bridge nor a LAG. Check whether it is on an
+ * interface that is in a bridge with us.
+ */
+ if (!foreign_dev_check_cb)
+ return err;
+
+ br = netdev_master_upper_dev_get(dev);
+ if (!br || !netif_is_bridge_master(br))
+ return err;
+
+ switchdev = switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb);
+ if (!switchdev)
+ return err;
+
+ if (!foreign_dev_check_cb(switchdev, dev))
+ return err;
+
+ return __switchdev_handle_port_obj_del(br, port_obj_info, check_cb,
+ foreign_dev_check_cb, del_cb);
+}
+
+/* Pass through a port object deletion, if @dev passes @check_cb, or replicate
+ * it towards all lower interfaces of @dev that pass @check_cb, if @dev is a
+ * bridge or a LAG.
+ */
+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,
+ NULL, del_cb);
+ if (err == -EOPNOTSUPP)
+ err = 0;
+ return err;
+}
+EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del);
+
+/* Same as switchdev_handle_port_obj_del(), except if object is notified on a
+ * @dev that passes @foreign_dev_check_cb, it is replicated towards all devices
+ * that pass @check_cb and are in the same bridge as @dev.
+ */
+int switchdev_handle_port_obj_del_foreign(struct net_device *dev,
+ struct switchdev_notifier_port_obj_info *port_obj_info,
+ bool (*check_cb)(const struct net_device *dev),
+ bool (*foreign_dev_check_cb)(const struct net_device *dev,
+ const struct net_device *foreign_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,
+ foreign_dev_check_cb, del_cb);
+ if (err == -EOPNOTSUPP)
+ err = 0;
+ return err;
+}
+EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del_foreign);
+
+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);
+
+int switchdev_bridge_port_offload(struct net_device *brport_dev,
+ struct net_device *dev, const void *ctx,
+ struct notifier_block *atomic_nb,
+ struct notifier_block *blocking_nb,
+ bool tx_fwd_offload,
+ struct netlink_ext_ack *extack)
+{
+ struct switchdev_notifier_brport_info brport_info = {
+ .brport = {
+ .dev = dev,
+ .ctx = ctx,
+ .atomic_nb = atomic_nb,
+ .blocking_nb = blocking_nb,
+ .tx_fwd_offload = tx_fwd_offload,
+ },
+ };
+ int err;
+
+ ASSERT_RTNL();
+
+ err = call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_OFFLOADED,
+ brport_dev, &brport_info.info,
+ extack);
+ return notifier_to_errno(err);
+}
+EXPORT_SYMBOL_GPL(switchdev_bridge_port_offload);
+
+void switchdev_bridge_port_unoffload(struct net_device *brport_dev,
+ const void *ctx,
+ struct notifier_block *atomic_nb,
+ struct notifier_block *blocking_nb)
+{
+ struct switchdev_notifier_brport_info brport_info = {
+ .brport = {
+ .ctx = ctx,
+ .atomic_nb = atomic_nb,
+ .blocking_nb = blocking_nb,
+ },
+ };
+
+ ASSERT_RTNL();
+
+ call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_UNOFFLOADED,
+ brport_dev, &brport_info.info,
+ NULL);
+}
+EXPORT_SYMBOL_GPL(switchdev_bridge_port_unoffload);
+
+int switchdev_bridge_port_replay(struct net_device *brport_dev,
+ struct net_device *dev, const void *ctx,
+ struct notifier_block *atomic_nb,
+ struct notifier_block *blocking_nb,
+ struct netlink_ext_ack *extack)
+{
+ struct switchdev_notifier_brport_info brport_info = {
+ .brport = {
+ .dev = dev,
+ .ctx = ctx,
+ .atomic_nb = atomic_nb,
+ .blocking_nb = blocking_nb,
+ },
+ };
+ int err;
+
+ ASSERT_RTNL();
+
+ err = call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_REPLAY,
+ brport_dev, &brport_info.info,
+ extack);
+ return notifier_to_errno(err);
+}
+EXPORT_SYMBOL_GPL(switchdev_bridge_port_replay);