diff options
Diffstat (limited to '')
| -rw-r--r-- | net/switchdev/Kconfig | 14 | ||||
| -rw-r--r-- | net/switchdev/Makefile | 6 | ||||
| -rw-r--r-- | net/switchdev/switchdev.c | 614 |
3 files changed, 634 insertions, 0 deletions
diff --git a/net/switchdev/Kconfig b/net/switchdev/Kconfig new file mode 100644 index 000000000..18a2d980e --- /dev/null +++ b/net/switchdev/Kconfig @@ -0,0 +1,14 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Configuration for Switch device support +# + +config NET_SWITCHDEV + bool "Switch (and switch-ish) device support" + depends on INET + help + This module provides glue between core networking code and device + drivers in order to support hardware switch chips in very generic + meaning of the word "switch". This include devices supporting L2/L3 but + also various flow offloading chips, including switches embedded into + SR-IOV NICs. diff --git a/net/switchdev/Makefile b/net/switchdev/Makefile new file mode 100644 index 000000000..bd69a3136 --- /dev/null +++ b/net/switchdev/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Makefile for the Switch device API +# + +obj-$(CONFIG_NET_SWITCHDEV) += switchdev.o diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c new file mode 100644 index 000000000..2c1ffc9ba --- /dev/null +++ b/net/switchdev/switchdev.c @@ -0,0 +1,614 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/switchdev/switchdev.c - Switch device API + * Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us> + * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com> + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/notifier.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/if_bridge.h> +#include <linux/list.h> +#include <linux/workqueue.h> +#include <linux/if_vlan.h> +#include <linux/rtnetlink.h> +#include <net/switchdev.h> + +static LIST_HEAD(deferred); +static DEFINE_SPINLOCK(deferred_lock); + +typedef void switchdev_deferred_func_t(struct net_device *dev, + const void *data); + +struct switchdev_deferred_item { + struct list_head list; + struct net_device *dev; + switchdev_deferred_func_t *func; + unsigned long data[]; +}; + +static struct switchdev_deferred_item *switchdev_deferred_dequeue(void) +{ + struct switchdev_deferred_item *dfitem; + + spin_lock_bh(&deferred_lock); + if (list_empty(&deferred)) { + dfitem = NULL; + goto unlock; + } + dfitem = list_first_entry(&deferred, + struct switchdev_deferred_item, list); + list_del(&dfitem->list); +unlock: + spin_unlock_bh(&deferred_lock); + return dfitem; +} + +/** + * switchdev_deferred_process - Process ops in deferred queue + * + * Called to flush the ops currently queued in deferred ops queue. + * rtnl_lock must be held. + */ +void switchdev_deferred_process(void) +{ + struct switchdev_deferred_item *dfitem; + + ASSERT_RTNL(); + + while ((dfitem = switchdev_deferred_dequeue())) { + dfitem->func(dfitem->dev, dfitem->data); + dev_put(dfitem->dev); + kfree(dfitem); + } +} +EXPORT_SYMBOL_GPL(switchdev_deferred_process); + +static void switchdev_deferred_process_work(struct work_struct *work) +{ + rtnl_lock(); + switchdev_deferred_process(); + rtnl_unlock(); +} + +static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work); + +static int switchdev_deferred_enqueue(struct net_device *dev, + const void *data, size_t data_len, + switchdev_deferred_func_t *func) +{ + struct switchdev_deferred_item *dfitem; + + dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC); + if (!dfitem) + return -ENOMEM; + dfitem->dev = dev; + dfitem->func = func; + memcpy(dfitem->data, data, data_len); + dev_hold(dev); + spin_lock_bh(&deferred_lock); + list_add_tail(&dfitem->list, &deferred); + spin_unlock_bh(&deferred_lock); + schedule_work(&deferred_process_work); + return 0; +} + +static int switchdev_port_attr_notify(enum switchdev_notifier_type nt, + struct net_device *dev, + const struct switchdev_attr *attr, + struct 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 + * @obj: object to add + * @extack: netlink extended ack + * + * 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 + * @obj: object to delete + * + * rtnl_lock must be held and must not be in atomic section, + * in case SWITCHDEV_F_DEFER flag is not set. + */ +int switchdev_port_obj_del(struct net_device *dev, + const struct switchdev_obj *obj) +{ + if (obj->flags & SWITCHDEV_F_DEFER) + return switchdev_port_obj_del_defer(dev, obj); + ASSERT_RTNL(); + return switchdev_port_obj_del_now(dev, obj); +} +EXPORT_SYMBOL_GPL(switchdev_port_obj_del); + +static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain); +static BLOCKING_NOTIFIER_HEAD(switchdev_blocking_notif_chain); + +/** + * register_switchdev_notifier - Register notifier + * @nb: notifier_block + * + * Register switch device notifier. + */ +int register_switchdev_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&switchdev_notif_chain, nb); +} +EXPORT_SYMBOL_GPL(register_switchdev_notifier); + +/** + * unregister_switchdev_notifier - Unregister notifier + * @nb: notifier_block + * + * Unregister switch device notifier. + */ +int unregister_switchdev_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb); +} +EXPORT_SYMBOL_GPL(unregister_switchdev_notifier); + +/** + * call_switchdev_notifiers - Call notifiers + * @val: value passed unmodified to notifier function + * @dev: port device + * @info: notifier information data + * @extack: netlink extended ack + * Call all network notifier blocks. + */ +int call_switchdev_notifiers(unsigned long val, struct net_device *dev, + struct switchdev_notifier_info *info, + struct netlink_ext_ack *extack) +{ + info->dev = dev; + info->extack = extack; + return atomic_notifier_call_chain(&switchdev_notif_chain, val, info); +} +EXPORT_SYMBOL_GPL(call_switchdev_notifiers); + +int register_switchdev_blocking_notifier(struct notifier_block *nb) +{ + struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain; + + return blocking_notifier_chain_register(chain, nb); +} +EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier); + +int unregister_switchdev_blocking_notifier(struct notifier_block *nb) +{ + struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain; + + return blocking_notifier_chain_unregister(chain, nb); +} +EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier); + +int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev, + struct switchdev_notifier_info *info, + struct netlink_ext_ack *extack) +{ + info->dev = dev; + info->extack = extack; + return blocking_notifier_call_chain(&switchdev_blocking_notif_chain, + val, info); +} +EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers); + +static int __switchdev_handle_port_obj_add(struct net_device *dev, + struct switchdev_notifier_port_obj_info *port_obj_info, + bool (*check_cb)(const struct net_device *dev), + int (*add_cb)(struct net_device *dev, + const 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)) { + err = add_cb(dev, port_obj_info->obj, port_obj_info->trans, + extack); + if (err != -EOPNOTSUPP) + port_obj_info->handled = true; + return err; + } + + /* Switch ports might be stacked under e.g. a LAG. Ignore the + * unsupported devices, another driver might be able to handle them. But + * propagate to the callers any hard errors. + * + * If the driver does its own bookkeeping of stacked ports, it's not + * necessary to go through this helper. + */ + netdev_for_each_lower_dev(dev, lower_dev, iter) { + if (netif_is_bridge_master(lower_dev)) + continue; + + err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info, + check_cb, add_cb); + if (err && err != -EOPNOTSUPP) + return err; + } + + return err; +} + +int switchdev_handle_port_obj_add(struct net_device *dev, + struct switchdev_notifier_port_obj_info *port_obj_info, + bool (*check_cb)(const struct net_device *dev), + int (*add_cb)(struct net_device *dev, + const struct switchdev_obj *obj, + struct switchdev_trans *trans, + struct netlink_ext_ack *extack)) +{ + int err; + + err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb, + add_cb); + if (err == -EOPNOTSUPP) + err = 0; + return err; +} +EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add); + +static int __switchdev_handle_port_obj_del(struct net_device *dev, + struct switchdev_notifier_port_obj_info *port_obj_info, + bool (*check_cb)(const struct net_device *dev), + int (*del_cb)(struct net_device *dev, + const struct switchdev_obj *obj)) +{ + struct net_device *lower_dev; + struct list_head *iter; + int err = -EOPNOTSUPP; + + if (check_cb(dev)) { + err = del_cb(dev, port_obj_info->obj); + if (err != -EOPNOTSUPP) + port_obj_info->handled = true; + return err; + } + + /* Switch ports might be stacked under e.g. a LAG. Ignore the + * unsupported devices, another driver might be able to handle them. But + * propagate to the callers any hard errors. + * + * If the driver does its own bookkeeping of stacked ports, it's not + * necessary to go through this helper. + */ + netdev_for_each_lower_dev(dev, lower_dev, iter) { + if (netif_is_bridge_master(lower_dev)) + continue; + + err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info, + check_cb, del_cb); + if (err && err != -EOPNOTSUPP) + return err; + } + + return err; +} + +int switchdev_handle_port_obj_del(struct net_device *dev, + struct switchdev_notifier_port_obj_info *port_obj_info, + bool (*check_cb)(const struct net_device *dev), + int (*del_cb)(struct net_device *dev, + const struct switchdev_obj *obj)) +{ + int err; + + err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb, + del_cb); + if (err == -EOPNOTSUPP) + err = 0; + return err; +} +EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del); + +static int __switchdev_handle_port_attr_set(struct net_device *dev, + struct switchdev_notifier_port_attr_info *port_attr_info, + bool (*check_cb)(const struct net_device *dev), + int (*set_cb)(struct net_device *dev, + const struct switchdev_attr *attr, + struct switchdev_trans *trans)) +{ + struct net_device *lower_dev; + struct list_head *iter; + int err = -EOPNOTSUPP; + + if (check_cb(dev)) { + err = set_cb(dev, port_attr_info->attr, port_attr_info->trans); + 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 struct switchdev_attr *attr, + struct switchdev_trans *trans)) +{ + 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); |