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Code Issues Releases Wiki Activity
linux-stable/net/switchdev/switchdev.c
Vladimir Oltean 957e2235e5 net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge 
With the introduction of explicit offloading API in switchdev in commit
2f5dc00f7a ("net: bridge: switchdev: let drivers inform which bridge
ports are offloaded"), we started having Ethernet switch drivers calling
directly into a function exported by net/bridge/br_switchdev.c, which is
a function exported by the bridge driver.

This means that drivers that did not have an explicit dependency on the
bridge before, like cpsw and am65-cpsw, now do - otherwise it is not
possible to call a symbol exported by a driver that can be built as
module unless you are a module too.

There was an attempt to solve the dependency issue in the form of commit
b0e8181762 ("net: build all switchdev drivers as modules when the
bridge is a module"). Grygorii Strashko, however, says about it:

| In my opinion, the problem is a bit bigger here than just fixing the
| build :(
|
| In case, of ^cpsw the switchdev mode is kinda optional and in many
| cases (especially for testing purposes, NFS) the multi-mac mode is
| still preferable mode.
|
| There were no such tight dependency between switchdev drivers and
| bridge core before and switchdev serviced as independent, notification
| based layer between them, so ^cpsw still can be "Y" and bridge can be
| "M". Now for mostly every kernel build configuration the CONFIG_BRIDGE
| will need to be set as "Y", or we will have to update drivers to
| support build with BRIDGE=n and maintain separate builds for
| networking vs non-networking testing.  But is this enough?  Wouldn't
| it cause 'chain reaction' required to add more and more "Y" options
| (like CONFIG_VLAN_8021Q)?
|
| PS. Just to be sure we on the same page - ARM builds will be forced
| (with this patch) to have CONFIG_TI_CPSW_SWITCHDEV=m and so all our
| automation testing will just fail with omap2plus_defconfig.

In the light of this, it would be desirable for some configurations to
avoid dependencies between switchdev drivers and the bridge, and have
the switchdev mode as completely optional within the driver.

Arnd Bergmann also tried to write a patch which better expressed the
build time dependency for Ethernet switch drivers where the switchdev
support is optional, like cpsw/am65-cpsw, and this made the drivers
follow the bridge (compile as module if the bridge is a module) only if
the optional switchdev support in the driver was enabled in the first
place:
https://patchwork.kernel.org/project/netdevbpf/patch/20210802144813.1152762-1-arnd@kernel.org/

but this still did not solve the fact that cpsw and am65-cpsw now must
be built as modules when the bridge is a module - it just expressed
correctly that optional dependency. But the new behavior is an apparent
regression from Grygorii's perspective.

So to support the use case where the Ethernet driver is built-in,
NET_SWITCHDEV (a bool option) is enabled, and the bridge is a module, we
need a framework that can handle the possible absence of the bridge from
the running system, i.e. runtime bloatware as opposed to build-time
bloatware.

Luckily we already have this framework, since switchdev has been using
it extensively. Events from the bridge side are transmitted to the
driver side using notifier chains - this was originally done so that
unrelated drivers could snoop for events emitted by the bridge towards
ports that are implemented by other drivers (think of a switch driver
with LAG offload that listens for switchdev events on a bonding/team
interface that it offloads).

There are also events which are transmitted from the driver side to the
bridge side, which again are modeled using notifiers.
SWITCHDEV_FDB_ADD_TO_BRIDGE is an example of this, and deals with
notifying the bridge that a MAC address has been dynamically learned.
So there is a precedent we can use for modeling the new framework.

The difference compared to SWITCHDEV_FDB_ADD_TO_BRIDGE is that the work
that the bridge needs to do when a port becomes offloaded is blocking in
its nature: replay VLANs, MDBs etc. The calling context is indeed
blocking (we are under rtnl_mutex), but the existing switchdev
notification chain that the bridge is subscribed to is only the atomic
one. So we need to subscribe the bridge to the blocking switchdev
notification chain too.

This patch:
- keeps the driver-side perception of the switchdev_bridge_port_{,un}offload
  unchanged
- moves the implementation of switchdev_bridge_port_{,un}offload from
  the bridge module into the switchdev module.
- makes everybody that is subscribed to the switchdev blocking notifier
  chain "hear" offload & unoffload events
- makes the bridge driver subscribe and handle those events
- moves the bridge driver's handling of those events into 2 new
  functions called br_switchdev_port_{,un}offload. These functions
  contain in fact the core of the logic that was previously in
  switchdev_bridge_port_{,un}offload, just that now we go through an
  extra indirection layer to reach them.

Unlike all the other switchdev notification structures, the structure
used to carry the bridge port information, struct
switchdev_notifier_brport_info, does not contain a "bool handled".
This is because in the current usage pattern, we always know that a
switchdev bridge port offloading event will be handled by the bridge,
because the switchdev_bridge_port_offload() call was initiated by a
NETDEV_CHANGEUPPER event in the first place, where info->upper_dev is a
bridge. So if the bridge wasn't loaded, then the CHANGEUPPER event
couldn't have happened.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-08-04 12:35:07 +01:00

859 lines
24 KiB
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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;
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 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(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 int __switchdev_handle_fdb_add_to_device(struct net_device *dev,
const struct net_device *orig_dev,
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 (*add_cb)(struct net_device *dev,
const struct net_device *orig_dev, const void *ctx,
const struct switchdev_notifier_fdb_info *fdb_info),
int (*lag_add_cb)(struct net_device *dev,
const struct net_device *orig_dev, 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 add_cb(dev, orig_dev, info->ctx, fdb_info);
if (netif_is_lag_master(dev)) {
if (!switchdev_lower_dev_find(dev, check_cb, foreign_dev_check_cb))
goto maybe_bridged_with_us;
/* This is a LAG interface that we offload */
if (!lag_add_cb)
return -EOPNOTSUPP;
return lag_add_cb(dev, orig_dev, 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(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(lower_dev, check_cb,
foreign_dev_check_cb))
continue;
err = __switchdev_handle_fdb_add_to_device(lower_dev, orig_dev,
fdb_info, check_cb,
foreign_dev_check_cb,
add_cb, lag_add_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(br, check_cb, foreign_dev_check_cb))
return 0;
return __switchdev_handle_fdb_add_to_device(br, orig_dev, fdb_info,
check_cb, foreign_dev_check_cb,
add_cb, lag_add_cb);
}
int switchdev_handle_fdb_add_to_device(struct net_device *dev,
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 (*add_cb)(struct net_device *dev,
const struct net_device *orig_dev, const void *ctx,
const struct switchdev_notifier_fdb_info *fdb_info),
int (*lag_add_cb)(struct net_device *dev,
const struct net_device *orig_dev, const void *ctx,
const struct switchdev_notifier_fdb_info *fdb_info))
{
int err;
err = __switchdev_handle_fdb_add_to_device(dev, dev, fdb_info,
check_cb,
foreign_dev_check_cb,
add_cb, lag_add_cb);
if (err == -EOPNOTSUPP)
err = 0;
return err;
}
EXPORT_SYMBOL_GPL(switchdev_handle_fdb_add_to_device);
static int __switchdev_handle_fdb_del_to_device(struct net_device *dev,
const struct net_device *orig_dev,
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 (*del_cb)(struct net_device *dev,
const struct net_device *orig_dev, const void *ctx,
const struct switchdev_notifier_fdb_info *fdb_info),
int (*lag_del_cb)(struct net_device *dev,
const struct net_device *orig_dev, 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 del_cb(dev, orig_dev, info->ctx, fdb_info);
if (netif_is_lag_master(dev)) {
if (!switchdev_lower_dev_find(dev, check_cb, foreign_dev_check_cb))
goto maybe_bridged_with_us;
/* This is a LAG interface that we offload */
if (!lag_del_cb)
return -EOPNOTSUPP;
return lag_del_cb(dev, orig_dev, 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(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(lower_dev, check_cb,
foreign_dev_check_cb))
continue;
err = __switchdev_handle_fdb_del_to_device(lower_dev, orig_dev,
fdb_info, check_cb,
foreign_dev_check_cb,
del_cb, lag_del_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(br, check_cb, foreign_dev_check_cb))
return 0;
return __switchdev_handle_fdb_del_to_device(br, orig_dev, fdb_info,
check_cb, foreign_dev_check_cb,
del_cb, lag_del_cb);
}
int switchdev_handle_fdb_del_to_device(struct net_device *dev,
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 (*del_cb)(struct net_device *dev,
const struct net_device *orig_dev, const void *ctx,
const struct switchdev_notifier_fdb_info *fdb_info),
int (*lag_del_cb)(struct net_device *dev,
const struct net_device *orig_dev, const void *ctx,
const struct switchdev_notifier_fdb_info *fdb_info))
{
int err;
err = __switchdev_handle_fdb_del_to_device(dev, dev, fdb_info,
check_cb,
foreign_dev_check_cb,
del_cb, lag_del_cb);
if (err == -EOPNOTSUPP)
err = 0;
return err;
}
EXPORT_SYMBOL_GPL(switchdev_handle_fdb_del_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),
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 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 = 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;
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 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,
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 void *ctx,
const struct switchdev_obj *obj))
{
struct switchdev_notifier_info *info = &port_obj_info->info;
struct net_device *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;
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 void *ctx,
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 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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