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net: Add ops->ndo_xmit_flush()

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-08-22 16:21:53 -07:00
parent 4c83acbc56
commit 4798248e4e
9 changed files with 44 additions and 15 deletions
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35
include/linux/netdevice.h
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@ -782,6 +782,19 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
* (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 @@ struct net_device_ops {
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 @@ int __init dev_proc_init(void);
#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,