netdev: Create netdev_queue abstraction.

A netdev_queue is an entity managed by a qdisc.

Currently there is one RX and one TX queue, and a netdev_queue merely
contains a backpointer to the net_device.

The Qdisc struct is augmented with a netdev_queue pointer as well.

Eventually the 'dev' Qdisc member will go away and we will have the
resulting hierarchy:

	net_device --> netdev_queue --> Qdisc

Also, qdisc_alloc() and qdisc_create_dflt() now take a netdev_queue
pointer argument.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e009c6fbf5cd..515fd25bf0fc 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -448,6 +448,10 @@ static inline void napi_synchronize(const struct napi_struct *n)
 # define napi_synchronize(n)    barrier()
 #endif
 
+struct netdev_queue {
+        struct net_device       *dev;
+};
+
 /*
  *      The DEVICE structure.
  *      Actually, this whole structure is a big mistake.  It mixes I/O
@@ -624,6 +628,9 @@ struct net_device
 
         unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 
+        struct netdev_queue     rx_queue;
+        struct netdev_queue     tx_queue;
+
         /* ingress path synchronizer */
         spinlock_t              ingress_lock;
         struct Qdisc            *qdisc_ingress;