net: Add ops->ndo_xmit_flush()
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index eb73444..220c509 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -782,6 +782,19 @@
* (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
* Required can not be NULL.
*
+ * void (*ndo_xmit_flush)(struct net_device *dev, u16 queue);
+ * A driver implements this function when it wishes to support
+ * deferred TX queue flushing. The idea is that the expensive
+ * operation to trigger TX queue processing can be done after
+ * N calls to ndo_start_xmit rather than being done every single
+ * time. In this regime ndo_start_xmit will be called one or more
+ * times, and then a final ndo_xmit_flush call will be made to
+ * have the driver tell the device about the new pending TX queue
+ * entries. The kernel keeps track of which queues need flushing
+ * by monitoring skb->queue_mapping of the packets it submits to
+ * ndo_start_xmit. This is the queue value that will be passed
+ * to ndo_xmit_flush.
+ *
* u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
* void *accel_priv, select_queue_fallback_t fallback);
* Called to decide which queue to when device supports multiple
@@ -1005,6 +1018,7 @@
int (*ndo_stop)(struct net_device *dev);
netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb,
struct net_device *dev);
+ void (*ndo_xmit_flush)(struct net_device *dev, u16 queue);
u16 (*ndo_select_queue)(struct net_device *dev,
struct sk_buff *skb,
void *accel_priv,
@@ -3430,6 +3444,27 @@
#define dev_proc_init() 0
#endif
+static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
+ struct sk_buff *skb, struct net_device *dev)
+{
+ netdev_tx_t ret;
+ u16 q;
+
+ q = skb->queue_mapping;
+ ret = ops->ndo_start_xmit(skb, dev);
+ if (dev_xmit_complete(ret) && ops->ndo_xmit_flush)
+ ops->ndo_xmit_flush(dev, q);
+
+ return ret;
+}
+
+static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ return __netdev_start_xmit(ops, skb, dev);
+}
+
int netdev_class_create_file_ns(struct class_attribute *class_attr,
const void *ns);
void netdev_class_remove_file_ns(struct class_attribute *class_attr,