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, 8 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 75933932463d..9b281c906eb0 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4072,6 +4072,12 @@ static struct net_device_stats *internal_stats(struct net_device *dev)
         return &dev->stats;
 }
 
+static void netdev_init_queues(struct net_device *dev)
+{
+        dev->rx_queue.dev = dev;
+        dev->tx_queue.dev = dev;
+}
+
 /**
  *      alloc_netdev_mq - allocate network device
  *      @sizeof_priv:   size of private data to allocate space for
@@ -4124,6 +4130,8 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
         dev->egress_subqueue_count = queue_count;
         dev->gso_max_size = GSO_MAX_SIZE;
 
+        netdev_init_queues(dev);
+
         dev->get_stats = internal_stats;
         netpoll_netdev_init(dev);
         setup(dev);