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c4076cdd21
linux/net/switchdev/switchdev.c
Vladimir Oltean c4076cdd21 net: switchdev: introduce switchdev_handle_port_obj_{add,del} for foreign interfaces 
The switchdev_handle_port_obj_add() helper is good for replicating a
port object on the lower interfaces of @dev, if that object was emitted
on a bridge, or on a bridge port that is a LAG.

However, drivers that use this helper limit themselves to a box from
which they can no longer intercept port objects notified on neighbor
ports ("foreign interfaces").

One such driver is DSA, where software bridging with foreign interfaces
such as standalone NICs or Wi-Fi APs is an important use case. There, a
VLAN installed on a neighbor bridge port roughly corresponds to a
forwarding VLAN installed on the DSA switch's CPU port.

To support this use case while also making use of the benefits of the
switchdev_handle_* replication helper for port objects, introduce a new
variant of these functions that crawls through the neighbor ports of
@dev, in search of potentially compatible switchdev ports that are
interested in the event.

The strategy is identical to switchdev_handle_fdb_event_to_device():
if @dev wasn't a switchdev interface, then go one step upper, and
recursively call this function on the bridge that this port belongs to.
At the next recursion step, __switchdev_handle_port_obj_add() will
iterate through the bridge's lower interfaces. Among those, some will be
switchdev interfaces, and one will be the original @dev that we came
from. To prevent infinite recursion, we must suppress reentry into the
original @dev, and just call the @add_cb for the switchdev_interfaces.

It looks like this:

                br0
               / | \
              /  |  \
             /   |   \
           swp0 swp1 eth0

1. __switchdev_handle_port_obj_add(eth0)
   -> check_cb(eth0) returns false
   -> eth0 has no lower interfaces
   -> eth0's bridge is br0
   -> switchdev_lower_dev_find(br0, check_cb, foreign_dev_check_cb))
      finds br0

2. __switchdev_handle_port_obj_add(br0)
   -> check_cb(br0) returns false
   -> netdev_for_each_lower_dev
      -> check_cb(swp0) returns true, so we don't skip this interface

3. __switchdev_handle_port_obj_add(swp0)
   -> check_cb(swp0) returns true, so we call add_cb(swp0)

(back to netdev_for_each_lower_dev from 2)
      -> check_cb(swp1) returns true, so we don't skip this interface

4. __switchdev_handle_port_obj_add(swp1)
   -> check_cb(swp1) returns true, so we call add_cb(swp1)

(back to netdev_for_each_lower_dev from 2)
      -> check_cb(eth0) returns false, so we skip this interface to
         avoid infinite recursion

Note: eth0 could have been a LAG, and we don't want to suppress the
recursion through its lowers if those exist, so when check_cb() returns
false, we still call switchdev_lower_dev_find() to estimate whether
there's anything worth a recursion beneath that LAG. Using check_cb()
and foreign_dev_check_cb(), switchdev_lower_dev_find() not only figures
out whether the lowers of the LAG are switchdev, but also whether they
actively offload the LAG or not (whether the LAG is "foreign" to the
switchdev interface or not).

The port_obj_info->orig_dev is preserved across recursive calls, so
switchdev drivers still know on which device was this notification
originally emitted.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-02-16 11:21:04 +00:00

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// 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);
dev_put_track(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);
dev_hold_track(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),
int (*lag_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;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (check_cb(dev))
return mod_cb(dev, orig_dev, event, info->ctx, fdb_info);
if (netif_is_lag_master(dev)) {
if (!switchdev_lower_dev_find_rcu(dev, check_cb, foreign_dev_check_cb))
goto maybe_bridged_with_us;
/* This is a LAG interface that we offload */
if (!lag_mod_cb)
return -EOPNOTSUPP;
return lag_mod_cb(dev, orig_dev, event, info->ctx, fdb_info);
}
/* Recurse through lower interfaces in case the FDB entry is pointing
* towards a bridge device.
*/
if (netif_is_bridge_master(dev)) {
if (!switchdev_lower_dev_find_rcu(dev, check_cb, foreign_dev_check_cb))
return 0;
/* This is a bridge interface that we offload */
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, lag_mod_cb);
if (err && err != -EOPNOTSUPP)
return err;
}
return 0;
}
maybe_bridged_with_us:
/* 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;
if (!switchdev_lower_dev_find_rcu(br, check_cb, foreign_dev_check_cb))
return 0;
return __switchdev_handle_fdb_event_to_device(br, orig_dev, event, fdb_info,
check_cb, foreign_dev_check_cb,
mod_cb, lag_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 (*lag_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, lag_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;
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;
if (!switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb))
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;
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;
if (!switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb))
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);
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