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authorJiri Pirko <jiri@mellanox.com>2015-10-14 19:40:48 +0200
committerDavid S. Miller <davem@davemloft.net>2015-10-15 06:09:46 -0700
commit793f40147e82cdedc80971fa7f5596d6ed1e555e (patch)
tree2bb1f4e5265077009ab346ea8d0f2e12c70d7ab6 /net/switchdev
parentadc9048c607a08320e87befc940955d6ffe51fac (diff)
downloadblackbird-op-linux-793f40147e82cdedc80971fa7f5596d6ed1e555e.tar.gz
blackbird-op-linux-793f40147e82cdedc80971fa7f5596d6ed1e555e.zip
switchdev: introduce switchdev deferred ops infrastructure
Introduce infrastructure which will be used internally to defer ops. Note that the deferred ops are queued up and either are processed by scheduled work or explicitly by user calling deferred_process function. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/switchdev')
-rw-r--r--net/switchdev/switchdev.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index b8aaf820ef65..5e64b591aff7 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -17,6 +17,7 @@
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/list.h>
+#include <linux/workqueue.h>
#include <net/ip_fib.h>
#include <net/switchdev.h>
@@ -92,6 +93,85 @@ static void switchdev_trans_items_warn_destroy(struct net_device *dev,
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
*
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