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net: introduce NETDEV_CHANGE_TX_QUEUE_LEN

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This patch introduces a new event - NETDEV_CHANGE_TX_QUEUE_LEN, this
will be triggered when tx_queue_len. It could be used by net device
who want to do some processing at that time. An example is tun who may
want to resize tx array when tx_queue_len is changed.

Cc: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2016-06-30 14:45:35 +08:00 • committed by David S. Miller
parent bf900b3dbe
commit 08294a26e1
3 changed files with 26 additions and 4 deletions
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1
include/linux/netdevice.h
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@ -2237,6 +2237,7 @@ struct netdev_lag_lower_state_info {
#define NETDEV_PRECHANGEUPPER 0x001A
#define NETDEV_CHANGELOWERSTATE 0x001B
#define NETDEV_UDP_TUNNEL_PUSH_INFO 0x001C
#define NETDEV_CHANGE_TX_QUEUE_LEN 0x001E
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);