diff options
| -rw-r--r-- | Documentation/networking/switchdev.txt | 19 | ||||
| -rw-r--r-- | include/net/switchdev.h | 12 | ||||
| -rw-r--r-- | net/switchdev/switchdev.c | 100 |
3 files changed, 2 insertions, 129 deletions
diff --git a/Documentation/networking/switchdev.txt b/Documentation/networking/switchdev.txt index 633dd1fd81b7..86174ce8cd13 100644 --- a/Documentation/networking/switchdev.txt +++ b/Documentation/networking/switchdev.txt @@ -371,22 +371,3 @@ The driver can monitor for updates to arp_tbl using the netevent notifier NETEVENT_NEIGH_UPDATE. The device can be programmed with resolved nexthops for the routes as arp_tbl updates. The driver implements ndo_neigh_destroy to know when arp_tbl neighbor entries are purged from the port. - -Transaction item queue -^^^^^^^^^^^^^^^^^^^^^^ - -For switchdev ops attr_set and obj_add, there is a 2 phase transaction model -used. First phase is to "prepare" anything needed, including various checks, -memory allocation, etc. The goal is to handle the stuff that is not unlikely -to fail here. The second phase is to "commit" the actual changes. - -Switchdev provides an infrastructure for sharing items (for example memory -allocations) between the two phases. - -The object created by a driver in "prepare" phase and it is queued up by: -switchdev_trans_item_enqueue() -During the "commit" phase, the driver gets the object by: -switchdev_trans_item_dequeue() - -If a transaction is aborted during "prepare" phase, switchdev code will handle -cleanup of the queued-up objects. diff --git a/include/net/switchdev.h b/include/net/switchdev.h index e4f751e19ecf..0ebd67ae7012 100644 --- a/include/net/switchdev.h +++ b/include/net/switchdev.h @@ -20,14 +20,7 @@ #define SWITCHDEV_F_SKIP_EOPNOTSUPP BIT(1) #define SWITCHDEV_F_DEFER BIT(2) -struct switchdev_trans_item { - struct list_head list; - void *data; - void (*destructor)(const void *data); -}; - struct switchdev_trans { - struct list_head item_list; bool ph_prepare; }; @@ -105,11 +98,6 @@ struct switchdev_obj_port_mdb { #define SWITCHDEV_OBJ_PORT_MDB(OBJ) \ container_of((OBJ), struct switchdev_obj_port_mdb, obj) -void switchdev_trans_item_enqueue(struct switchdev_trans *trans, - void *data, void (*destructor)(void const *), - struct switchdev_trans_item *tritem); -void *switchdev_trans_item_dequeue(struct switchdev_trans *trans); - typedef int switchdev_obj_dump_cb_t(struct switchdev_obj *obj); enum switchdev_notifier_type { diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c index d81cfcee9ad9..90ba4a1f0a6d 100644 --- a/net/switchdev/switchdev.c +++ b/net/switchdev/switchdev.c @@ -23,78 +23,6 @@ #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); @@ -208,8 +136,6 @@ static int switchdev_port_attr_set_now(struct net_device *dev, 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 @@ -220,17 +146,8 @@ static int switchdev_port_attr_set_now(struct net_device *dev, trans.ph_prepare = true; err = switchdev_port_attr_notify(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); - + if (err) return err; - } /* Phase II: commit attr set. This cannot fail as a fault * of driver/device. If it does, it's a bug in the driver/device @@ -242,7 +159,6 @@ static int switchdev_port_attr_set_now(struct net_device *dev, &trans); WARN(err, "%s: Commit of attribute (id=%d) failed.\n", dev->name, attr->id); - switchdev_trans_items_warn_destroy(dev, &trans); return err; } @@ -341,8 +257,6 @@ static int switchdev_port_obj_add_now(struct net_device *dev, 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 @@ -353,17 +267,8 @@ static int switchdev_port_obj_add_now(struct net_device *dev, trans.ph_prepare = true; err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, dev, obj, &trans, extack); - 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); - + if (err) return err; - } /* Phase II: commit obj add. This cannot fail as a fault * of driver/device. If it does, it's a bug in the driver/device @@ -374,7 +279,6 @@ static int switchdev_port_obj_add_now(struct net_device *dev, err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD, dev, obj, &trans, extack); WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id); - switchdev_trans_items_warn_destroy(dev, &trans); return err; } |