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switchdev: Remove unused transaction item queue
There are no more in tree users of the
switchdev_trans_item_{dequeue,enqueue} or switchdev_trans_item structure
in the kernel since commit 00fc0c51e3 ("rocker: Change world_ops API
and implementation to be switchdev independant").
Remove this unused code and update the documentation accordingly since.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli
David S. Miller
parent
9bfc445e0e
commit
91cf8eceff
@ -371,22 +371,3 @@ The driver can monitor for updates to arp_tbl using the netevent notifier
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NETEVENT_NEIGH_UPDATE. The device can be programmed with resolved nexthops
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for the routes as arp_tbl updates. The driver implements ndo_neigh_destroy
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to know when arp_tbl neighbor entries are purged from the port.
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Transaction item queue
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^^^^^^^^^^^^^^^^^^^^^^
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For switchdev ops attr_set and obj_add, there is a 2 phase transaction model
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used. First phase is to "prepare" anything needed, including various checks,
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memory allocation, etc. The goal is to handle the stuff that is not unlikely
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to fail here. The second phase is to "commit" the actual changes.
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Switchdev provides an infrastructure for sharing items (for example memory
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allocations) between the two phases.
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The object created by a driver in "prepare" phase and it is queued up by:
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switchdev_trans_item_enqueue()
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During the "commit" phase, the driver gets the object by:
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switchdev_trans_item_dequeue()
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If a transaction is aborted during "prepare" phase, switchdev code will handle
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cleanup of the queued-up objects.
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@ -20,14 +20,7 @@
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#define SWITCHDEV_F_SKIP_EOPNOTSUPP BIT(1)
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#define SWITCHDEV_F_DEFER BIT(2)
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struct switchdev_trans_item {
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struct list_head list;
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void *data;
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void (*destructor)(const void *data);
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};
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struct switchdev_trans {
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struct list_head item_list;
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bool ph_prepare;
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};
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@ -105,11 +98,6 @@ struct switchdev_obj_port_mdb {
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#define SWITCHDEV_OBJ_PORT_MDB(OBJ) \
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container_of((OBJ), struct switchdev_obj_port_mdb, obj)
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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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void *switchdev_trans_item_dequeue(struct switchdev_trans *trans);
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typedef int switchdev_obj_dump_cb_t(struct switchdev_obj *obj);
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enum switchdev_notifier_type {
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@ -23,78 +23,6 @@
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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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@ -208,8 +136,6 @@ static int switchdev_port_attr_set_now(struct net_device *dev,
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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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@ -220,17 +146,8 @@ static int switchdev_port_attr_set_now(struct net_device *dev,
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trans.ph_prepare = true;
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err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
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&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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if (err)
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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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@ -242,7 +159,6 @@ static int switchdev_port_attr_set_now(struct net_device *dev,
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&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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@ -341,8 +257,6 @@ static int switchdev_port_obj_add_now(struct net_device *dev,
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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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@ -353,17 +267,8 @@ static int switchdev_port_obj_add_now(struct net_device *dev,
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trans.ph_prepare = true;
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err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
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dev, obj, &trans, extack);
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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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if (err)
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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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@ -374,7 +279,6 @@ static int switchdev_port_obj_add_now(struct net_device *dev,
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err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
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dev, obj, &trans, extack);
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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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