![Arkadi Sharshevsky](/assets/img/avatar_default.png)
Currently the bridge port flags, vlans, FDBs and MDBs can be offloaded through the bridge code, making the switchdev's SELF bridge bypass implementation to be redundant. This implies several changes: - No need for dump infra in switchdev, DSA's special case is handled privately. - Remove obj_dump from switchdev_ops. - FDBs are removed from obj_add/del routines, due to the fact that they are offloaded through the bridge notification chain. - The switchdev_port_bridge_xx() and switchdev_port_fdb_xx() functions can be removed. Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com> Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Ivan Vecera <ivecera@redhat.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
596 lines
16 KiB
C
596 lines
16 KiB
C
/*
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* net/switchdev/switchdev.c - Switch device API
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* Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
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* Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_bridge.h>
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#include <linux/list.h>
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#include <linux/workqueue.h>
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#include <linux/if_vlan.h>
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#include <linux/rtnetlink.h>
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#include <net/switchdev.h>
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/**
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* switchdev_trans_item_enqueue - Enqueue data item to transaction queue
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*
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* @trans: transaction
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* @data: pointer to data being queued
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* @destructor: data destructor
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* @tritem: transaction item being queued
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*
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* Enqeueue data item to transaction queue. tritem is typically placed in
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* cointainter pointed at by data pointer. Destructor is called on
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* transaction abort and after successful commit phase in case
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* the caller did not dequeue the item before.
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*/
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void switchdev_trans_item_enqueue(struct switchdev_trans *trans,
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void *data, void (*destructor)(void const *),
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struct switchdev_trans_item *tritem)
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{
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tritem->data = data;
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tritem->destructor = destructor;
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list_add_tail(&tritem->list, &trans->item_list);
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}
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EXPORT_SYMBOL_GPL(switchdev_trans_item_enqueue);
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static struct switchdev_trans_item *
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__switchdev_trans_item_dequeue(struct switchdev_trans *trans)
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{
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struct switchdev_trans_item *tritem;
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if (list_empty(&trans->item_list))
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return NULL;
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tritem = list_first_entry(&trans->item_list,
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struct switchdev_trans_item, list);
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list_del(&tritem->list);
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return tritem;
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}
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/**
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* switchdev_trans_item_dequeue - Dequeue data item from transaction queue
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*
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* @trans: transaction
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*/
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void *switchdev_trans_item_dequeue(struct switchdev_trans *trans)
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{
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struct switchdev_trans_item *tritem;
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tritem = __switchdev_trans_item_dequeue(trans);
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BUG_ON(!tritem);
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return tritem->data;
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}
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EXPORT_SYMBOL_GPL(switchdev_trans_item_dequeue);
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static void switchdev_trans_init(struct switchdev_trans *trans)
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{
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INIT_LIST_HEAD(&trans->item_list);
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}
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static void switchdev_trans_items_destroy(struct switchdev_trans *trans)
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{
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struct switchdev_trans_item *tritem;
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while ((tritem = __switchdev_trans_item_dequeue(trans)))
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tritem->destructor(tritem->data);
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}
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static void switchdev_trans_items_warn_destroy(struct net_device *dev,
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struct switchdev_trans *trans)
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{
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WARN(!list_empty(&trans->item_list), "%s: transaction item queue is not empty.\n",
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dev->name);
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switchdev_trans_items_destroy(trans);
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}
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static LIST_HEAD(deferred);
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static DEFINE_SPINLOCK(deferred_lock);
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typedef void switchdev_deferred_func_t(struct net_device *dev,
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const void *data);
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struct switchdev_deferred_item {
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struct list_head list;
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struct net_device *dev;
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switchdev_deferred_func_t *func;
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unsigned long data[0];
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};
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static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
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{
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struct switchdev_deferred_item *dfitem;
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spin_lock_bh(&deferred_lock);
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if (list_empty(&deferred)) {
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dfitem = NULL;
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goto unlock;
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}
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dfitem = list_first_entry(&deferred,
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struct switchdev_deferred_item, list);
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list_del(&dfitem->list);
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unlock:
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spin_unlock_bh(&deferred_lock);
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return dfitem;
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}
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/**
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* switchdev_deferred_process - Process ops in deferred queue
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*
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* Called to flush the ops currently queued in deferred ops queue.
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* rtnl_lock must be held.
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*/
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void switchdev_deferred_process(void)
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{
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struct switchdev_deferred_item *dfitem;
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ASSERT_RTNL();
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while ((dfitem = switchdev_deferred_dequeue())) {
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dfitem->func(dfitem->dev, dfitem->data);
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dev_put(dfitem->dev);
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kfree(dfitem);
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}
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}
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EXPORT_SYMBOL_GPL(switchdev_deferred_process);
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static void switchdev_deferred_process_work(struct work_struct *work)
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{
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rtnl_lock();
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switchdev_deferred_process();
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rtnl_unlock();
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}
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static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
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static int switchdev_deferred_enqueue(struct net_device *dev,
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const void *data, size_t data_len,
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switchdev_deferred_func_t *func)
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{
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struct switchdev_deferred_item *dfitem;
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dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC);
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if (!dfitem)
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return -ENOMEM;
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dfitem->dev = dev;
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dfitem->func = func;
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memcpy(dfitem->data, data, data_len);
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dev_hold(dev);
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spin_lock_bh(&deferred_lock);
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list_add_tail(&dfitem->list, &deferred);
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spin_unlock_bh(&deferred_lock);
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schedule_work(&deferred_process_work);
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return 0;
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}
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/**
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* switchdev_port_attr_get - Get port attribute
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*
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* @dev: port device
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* @attr: attribute to get
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*/
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int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
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{
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const struct switchdev_ops *ops = dev->switchdev_ops;
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struct net_device *lower_dev;
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struct list_head *iter;
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struct switchdev_attr first = {
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.id = SWITCHDEV_ATTR_ID_UNDEFINED
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};
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int err = -EOPNOTSUPP;
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if (ops && ops->switchdev_port_attr_get)
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return ops->switchdev_port_attr_get(dev, attr);
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if (attr->flags & SWITCHDEV_F_NO_RECURSE)
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return err;
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/* Switch device port(s) may be stacked under
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* bond/team/vlan dev, so recurse down to get attr on
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* each port. Return -ENODATA if attr values don't
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* compare across ports.
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*/
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netdev_for_each_lower_dev(dev, lower_dev, iter) {
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err = switchdev_port_attr_get(lower_dev, attr);
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if (err)
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break;
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if (first.id == SWITCHDEV_ATTR_ID_UNDEFINED)
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first = *attr;
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else if (memcmp(&first, attr, sizeof(*attr)))
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return -ENODATA;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
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static int __switchdev_port_attr_set(struct net_device *dev,
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const struct switchdev_attr *attr,
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struct switchdev_trans *trans)
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{
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const struct switchdev_ops *ops = dev->switchdev_ops;
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struct net_device *lower_dev;
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struct list_head *iter;
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int err = -EOPNOTSUPP;
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if (ops && ops->switchdev_port_attr_set) {
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err = ops->switchdev_port_attr_set(dev, attr, trans);
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goto done;
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}
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if (attr->flags & SWITCHDEV_F_NO_RECURSE)
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goto done;
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/* Switch device port(s) may be stacked under
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* bond/team/vlan dev, so recurse down to set attr on
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* each port.
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*/
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netdev_for_each_lower_dev(dev, lower_dev, iter) {
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err = __switchdev_port_attr_set(lower_dev, attr, trans);
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if (err)
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break;
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}
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done:
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if (err == -EOPNOTSUPP && attr->flags & SWITCHDEV_F_SKIP_EOPNOTSUPP)
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err = 0;
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return err;
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}
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static int switchdev_port_attr_set_now(struct net_device *dev,
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const struct switchdev_attr *attr)
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{
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struct switchdev_trans trans;
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int err;
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switchdev_trans_init(&trans);
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/* Phase I: prepare for attr set. Driver/device should fail
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* here if there are going to be issues in the commit phase,
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* such as lack of resources or support. The driver/device
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* should reserve resources needed for the commit phase here,
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* but should not commit the attr.
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*/
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trans.ph_prepare = true;
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err = __switchdev_port_attr_set(dev, attr, &trans);
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if (err) {
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/* Prepare phase failed: abort the transaction. Any
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* resources reserved in the prepare phase are
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* released.
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*/
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if (err != -EOPNOTSUPP)
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switchdev_trans_items_destroy(&trans);
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return err;
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}
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/* Phase II: commit attr set. This cannot fail as a fault
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* of driver/device. If it does, it's a bug in the driver/device
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* because the driver said everythings was OK in phase I.
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*/
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trans.ph_prepare = false;
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err = __switchdev_port_attr_set(dev, attr, &trans);
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WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
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dev->name, attr->id);
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switchdev_trans_items_warn_destroy(dev, &trans);
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return err;
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}
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static void switchdev_port_attr_set_deferred(struct net_device *dev,
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const void *data)
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{
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const struct switchdev_attr *attr = data;
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int err;
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err = switchdev_port_attr_set_now(dev, attr);
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if (err && err != -EOPNOTSUPP)
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netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
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err, attr->id);
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if (attr->complete)
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attr->complete(dev, err, attr->complete_priv);
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}
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static int switchdev_port_attr_set_defer(struct net_device *dev,
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const struct switchdev_attr *attr)
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{
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return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
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switchdev_port_attr_set_deferred);
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}
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/**
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* switchdev_port_attr_set - Set port attribute
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*
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* @dev: port device
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* @attr: attribute to set
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*
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* Use a 2-phase prepare-commit transaction model to ensure
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* system is not left in a partially updated state due to
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* failure from driver/device.
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*
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* rtnl_lock must be held and must not be in atomic section,
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* in case SWITCHDEV_F_DEFER flag is not set.
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*/
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int switchdev_port_attr_set(struct net_device *dev,
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const struct switchdev_attr *attr)
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{
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if (attr->flags & SWITCHDEV_F_DEFER)
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return switchdev_port_attr_set_defer(dev, attr);
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ASSERT_RTNL();
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return switchdev_port_attr_set_now(dev, attr);
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}
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EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
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static size_t switchdev_obj_size(const struct switchdev_obj *obj)
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{
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switch (obj->id) {
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case SWITCHDEV_OBJ_ID_PORT_VLAN:
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return sizeof(struct switchdev_obj_port_vlan);
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case SWITCHDEV_OBJ_ID_PORT_MDB:
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return sizeof(struct switchdev_obj_port_mdb);
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default:
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BUG();
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}
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return 0;
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}
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static int __switchdev_port_obj_add(struct net_device *dev,
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const struct switchdev_obj *obj,
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struct switchdev_trans *trans)
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{
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const struct switchdev_ops *ops = dev->switchdev_ops;
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struct net_device *lower_dev;
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struct list_head *iter;
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int err = -EOPNOTSUPP;
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if (ops && ops->switchdev_port_obj_add)
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return ops->switchdev_port_obj_add(dev, obj, trans);
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/* Switch device port(s) may be stacked under
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* bond/team/vlan dev, so recurse down to add object on
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* each port.
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*/
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netdev_for_each_lower_dev(dev, lower_dev, iter) {
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err = __switchdev_port_obj_add(lower_dev, obj, trans);
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if (err)
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break;
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}
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return err;
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}
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static int switchdev_port_obj_add_now(struct net_device *dev,
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const struct switchdev_obj *obj)
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{
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struct switchdev_trans trans;
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int err;
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ASSERT_RTNL();
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switchdev_trans_init(&trans);
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/* Phase I: prepare for obj add. Driver/device should fail
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* here if there are going to be issues in the commit phase,
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* such as lack of resources or support. The driver/device
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* should reserve resources needed for the commit phase here,
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* but should not commit the obj.
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*/
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trans.ph_prepare = true;
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err = __switchdev_port_obj_add(dev, obj, &trans);
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if (err) {
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/* Prepare phase failed: abort the transaction. Any
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* resources reserved in the prepare phase are
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* released.
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*/
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if (err != -EOPNOTSUPP)
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switchdev_trans_items_destroy(&trans);
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return err;
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}
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/* Phase II: commit obj add. This cannot fail as a fault
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* of driver/device. If it does, it's a bug in the driver/device
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* because the driver said everythings was OK in phase I.
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*/
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trans.ph_prepare = false;
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err = __switchdev_port_obj_add(dev, obj, &trans);
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WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
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switchdev_trans_items_warn_destroy(dev, &trans);
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return err;
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}
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static void switchdev_port_obj_add_deferred(struct net_device *dev,
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const void *data)
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{
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const struct switchdev_obj *obj = data;
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int err;
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err = switchdev_port_obj_add_now(dev, obj);
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if (err && err != -EOPNOTSUPP)
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netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
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err, obj->id);
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if (obj->complete)
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obj->complete(dev, err, obj->complete_priv);
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}
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static int switchdev_port_obj_add_defer(struct net_device *dev,
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const struct switchdev_obj *obj)
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{
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return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
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switchdev_port_obj_add_deferred);
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}
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/**
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* switchdev_port_obj_add - Add port object
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*
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* @dev: port device
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* @id: object ID
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* @obj: object to add
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*
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* Use a 2-phase prepare-commit transaction model to ensure
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* system is not left in a partially updated state due to
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* failure from driver/device.
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*
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* rtnl_lock must be held and must not be in atomic section,
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* in case SWITCHDEV_F_DEFER flag is not set.
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*/
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int switchdev_port_obj_add(struct net_device *dev,
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const struct switchdev_obj *obj)
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{
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if (obj->flags & SWITCHDEV_F_DEFER)
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return switchdev_port_obj_add_defer(dev, obj);
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ASSERT_RTNL();
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return switchdev_port_obj_add_now(dev, obj);
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}
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EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
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static int switchdev_port_obj_del_now(struct net_device *dev,
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const struct switchdev_obj *obj)
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{
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const struct switchdev_ops *ops = dev->switchdev_ops;
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struct net_device *lower_dev;
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struct list_head *iter;
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int err = -EOPNOTSUPP;
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if (ops && ops->switchdev_port_obj_del)
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return ops->switchdev_port_obj_del(dev, obj);
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/* Switch device port(s) may be stacked under
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* bond/team/vlan dev, so recurse down to delete object on
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* each port.
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*/
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netdev_for_each_lower_dev(dev, lower_dev, iter) {
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err = switchdev_port_obj_del_now(lower_dev, obj);
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if (err)
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break;
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}
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return err;
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}
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static void switchdev_port_obj_del_deferred(struct net_device *dev,
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const void *data)
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{
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const struct switchdev_obj *obj = data;
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int err;
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err = switchdev_port_obj_del_now(dev, obj);
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if (err && err != -EOPNOTSUPP)
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netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
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err, obj->id);
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if (obj->complete)
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obj->complete(dev, err, obj->complete_priv);
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}
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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);
|