mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
47d5b6db2a
When the host joins or leaves a multicast group, use switchdev to add an object to the hardware to forward traffic for the group to the host. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
598 lines
16 KiB
C
598 lines
16 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#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>
|
|
|
|
/**
|
|
* switchdev_trans_item_enqueue - Enqueue data item to transaction queue
|
|
*
|
|
* @trans: transaction
|
|
* @data: pointer to data being queued
|
|
* @destructor: data destructor
|
|
* @tritem: transaction item being queued
|
|
*
|
|
* Enqeueue data item to transaction queue. tritem is typically placed in
|
|
* cointainter pointed at by data pointer. Destructor is called on
|
|
* transaction abort and after successful commit phase in case
|
|
* the caller did not dequeue the item before.
|
|
*/
|
|
void switchdev_trans_item_enqueue(struct switchdev_trans *trans,
|
|
void *data, void (*destructor)(void const *),
|
|
struct switchdev_trans_item *tritem)
|
|
{
|
|
tritem->data = data;
|
|
tritem->destructor = destructor;
|
|
list_add_tail(&tritem->list, &trans->item_list);
|
|
}
|
|
EXPORT_SYMBOL_GPL(switchdev_trans_item_enqueue);
|
|
|
|
static struct switchdev_trans_item *
|
|
__switchdev_trans_item_dequeue(struct switchdev_trans *trans)
|
|
{
|
|
struct switchdev_trans_item *tritem;
|
|
|
|
if (list_empty(&trans->item_list))
|
|
return NULL;
|
|
tritem = list_first_entry(&trans->item_list,
|
|
struct switchdev_trans_item, list);
|
|
list_del(&tritem->list);
|
|
return tritem;
|
|
}
|
|
|
|
/**
|
|
* switchdev_trans_item_dequeue - Dequeue data item from transaction queue
|
|
*
|
|
* @trans: transaction
|
|
*/
|
|
void *switchdev_trans_item_dequeue(struct switchdev_trans *trans)
|
|
{
|
|
struct switchdev_trans_item *tritem;
|
|
|
|
tritem = __switchdev_trans_item_dequeue(trans);
|
|
BUG_ON(!tritem);
|
|
return tritem->data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(switchdev_trans_item_dequeue);
|
|
|
|
static void switchdev_trans_init(struct switchdev_trans *trans)
|
|
{
|
|
INIT_LIST_HEAD(&trans->item_list);
|
|
}
|
|
|
|
static void switchdev_trans_items_destroy(struct switchdev_trans *trans)
|
|
{
|
|
struct switchdev_trans_item *tritem;
|
|
|
|
while ((tritem = __switchdev_trans_item_dequeue(trans)))
|
|
tritem->destructor(tritem->data);
|
|
}
|
|
|
|
static void switchdev_trans_items_warn_destroy(struct net_device *dev,
|
|
struct switchdev_trans *trans)
|
|
{
|
|
WARN(!list_empty(&trans->item_list), "%s: transaction item queue is not empty.\n",
|
|
dev->name);
|
|
switchdev_trans_items_destroy(trans);
|
|
}
|
|
|
|
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[0];
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* switchdev_port_attr_get - Get port attribute
|
|
*
|
|
* @dev: port device
|
|
* @attr: attribute to get
|
|
*/
|
|
int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
|
|
{
|
|
const struct switchdev_ops *ops = dev->switchdev_ops;
|
|
struct net_device *lower_dev;
|
|
struct list_head *iter;
|
|
struct switchdev_attr first = {
|
|
.id = SWITCHDEV_ATTR_ID_UNDEFINED
|
|
};
|
|
int err = -EOPNOTSUPP;
|
|
|
|
if (ops && ops->switchdev_port_attr_get)
|
|
return ops->switchdev_port_attr_get(dev, attr);
|
|
|
|
if (attr->flags & SWITCHDEV_F_NO_RECURSE)
|
|
return err;
|
|
|
|
/* Switch device port(s) may be stacked under
|
|
* bond/team/vlan dev, so recurse down to get attr on
|
|
* each port. Return -ENODATA if attr values don't
|
|
* compare across ports.
|
|
*/
|
|
|
|
netdev_for_each_lower_dev(dev, lower_dev, iter) {
|
|
err = switchdev_port_attr_get(lower_dev, attr);
|
|
if (err)
|
|
break;
|
|
if (first.id == SWITCHDEV_ATTR_ID_UNDEFINED)
|
|
first = *attr;
|
|
else if (memcmp(&first, attr, sizeof(*attr)))
|
|
return -ENODATA;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
|
|
|
|
static int __switchdev_port_attr_set(struct net_device *dev,
|
|
const struct switchdev_attr *attr,
|
|
struct switchdev_trans *trans)
|
|
{
|
|
const struct switchdev_ops *ops = dev->switchdev_ops;
|
|
struct net_device *lower_dev;
|
|
struct list_head *iter;
|
|
int err = -EOPNOTSUPP;
|
|
|
|
if (ops && ops->switchdev_port_attr_set) {
|
|
err = ops->switchdev_port_attr_set(dev, attr, trans);
|
|
goto done;
|
|
}
|
|
|
|
if (attr->flags & SWITCHDEV_F_NO_RECURSE)
|
|
goto done;
|
|
|
|
/* Switch device port(s) may be stacked under
|
|
* bond/team/vlan dev, so recurse down to set attr on
|
|
* each port.
|
|
*/
|
|
|
|
netdev_for_each_lower_dev(dev, lower_dev, iter) {
|
|
err = __switchdev_port_attr_set(lower_dev, attr, trans);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (err == -EOPNOTSUPP && attr->flags & SWITCHDEV_F_SKIP_EOPNOTSUPP)
|
|
err = 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int switchdev_port_attr_set_now(struct net_device *dev,
|
|
const struct switchdev_attr *attr)
|
|
{
|
|
struct switchdev_trans trans;
|
|
int err;
|
|
|
|
switchdev_trans_init(&trans);
|
|
|
|
/* 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_set(dev, attr, &trans);
|
|
if (err) {
|
|
/* Prepare phase failed: abort the transaction. Any
|
|
* resources reserved in the prepare phase are
|
|
* released.
|
|
*/
|
|
|
|
if (err != -EOPNOTSUPP)
|
|
switchdev_trans_items_destroy(&trans);
|
|
|
|
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_set(dev, attr, &trans);
|
|
WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
|
|
dev->name, attr->id);
|
|
switchdev_trans_items_warn_destroy(dev, &trans);
|
|
|
|
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_add(struct net_device *dev,
|
|
const struct switchdev_obj *obj,
|
|
struct switchdev_trans *trans)
|
|
{
|
|
const struct switchdev_ops *ops = dev->switchdev_ops;
|
|
struct net_device *lower_dev;
|
|
struct list_head *iter;
|
|
int err = -EOPNOTSUPP;
|
|
|
|
if (ops && ops->switchdev_port_obj_add)
|
|
return ops->switchdev_port_obj_add(dev, obj, trans);
|
|
|
|
/* Switch device port(s) may be stacked under
|
|
* bond/team/vlan dev, so recurse down to add object on
|
|
* each port.
|
|
*/
|
|
|
|
netdev_for_each_lower_dev(dev, lower_dev, iter) {
|
|
err = __switchdev_port_obj_add(lower_dev, obj, trans);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int switchdev_port_obj_add_now(struct net_device *dev,
|
|
const struct switchdev_obj *obj)
|
|
{
|
|
struct switchdev_trans trans;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
switchdev_trans_init(&trans);
|
|
|
|
/* 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_add(dev, obj, &trans);
|
|
if (err) {
|
|
/* Prepare phase failed: abort the transaction. Any
|
|
* resources reserved in the prepare phase are
|
|
* released.
|
|
*/
|
|
|
|
if (err != -EOPNOTSUPP)
|
|
switchdev_trans_items_destroy(&trans);
|
|
|
|
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_add(dev, obj, &trans);
|
|
WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
|
|
switchdev_trans_items_warn_destroy(dev, &trans);
|
|
|
|
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);
|
|
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
|
|
* @id: object ID
|
|
* @obj: object to add
|
|
*
|
|
* 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)
|
|
{
|
|
if (obj->flags & SWITCHDEV_F_DEFER)
|
|
return switchdev_port_obj_add_defer(dev, obj);
|
|
ASSERT_RTNL();
|
|
return switchdev_port_obj_add_now(dev, obj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
|
|
|
|
static int switchdev_port_obj_del_now(struct net_device *dev,
|
|
const struct switchdev_obj *obj)
|
|
{
|
|
const struct switchdev_ops *ops = dev->switchdev_ops;
|
|
struct net_device *lower_dev;
|
|
struct list_head *iter;
|
|
int err = -EOPNOTSUPP;
|
|
|
|
if (ops && ops->switchdev_port_obj_del)
|
|
return ops->switchdev_port_obj_del(dev, obj);
|
|
|
|
/* Switch device port(s) may be stacked under
|
|
* bond/team/vlan dev, so recurse down to delete object on
|
|
* each port.
|
|
*/
|
|
|
|
netdev_for_each_lower_dev(dev, lower_dev, iter) {
|
|
err = switchdev_port_obj_del_now(lower_dev, obj);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
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
|
|
* @id: object ID
|
|
* @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);
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* Call all network notifier blocks.
|
|
*/
|
|
int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
|
|
struct switchdev_notifier_info *info)
|
|
{
|
|
info->dev = dev;
|
|
return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
|
|
|
|
bool switchdev_port_same_parent_id(struct net_device *a,
|
|
struct net_device *b)
|
|
{
|
|
struct switchdev_attr a_attr = {
|
|
.orig_dev = a,
|
|
.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
|
|
};
|
|
struct switchdev_attr b_attr = {
|
|
.orig_dev = b,
|
|
.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
|
|
};
|
|
|
|
if (switchdev_port_attr_get(a, &a_attr) ||
|
|
switchdev_port_attr_get(b, &b_attr))
|
|
return false;
|
|
|
|
return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
|
|
}
|
|
EXPORT_SYMBOL_GPL(switchdev_port_same_parent_id);
|