netdev: Allocate multiple queues for TX.

alloc_netdev_mq() now allocates an array of netdev_queue
structures for TX, based upon the queue_count argument.

Furthermore, all accesses to the TX queues are now vectored
through the netdev_get_tx_queue() and netdev_for_each_tx_queue()
interfaces.  This makes it easy to grep the tree for all
things that want to get to a TX queue of a net device.

Problem spots which are not really multiqueue aware yet, and
only work with one queue, can easily be spotted by grepping
for all netdev_get_tx_queue() calls that pass in a zero index.

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

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index ccbd6554f6eb..897b05e79ed0 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -229,14 +229,20 @@ module_param(numifbs, int, 0);
 MODULE_PARM_DESC(numifbs, "Number of ifb devices");
 
 /*
- * dev_ifb->tx_queue.lock is usually taken after dev->rx_queue.lock,
+ * dev_ifb's TX queue lock is usually taken after dev->rx_queue.lock,
  * reversely to e.g. qdisc_lock_tree(). It should be safe until
- * ifb doesn't take dev->tx_queue.lock with dev_ifb->rx_queue.lock.
+ * ifb doesn't take dev's TX queue lock with dev_ifb->rx_queue.lock.
  * But lockdep should know that ifb has different locks from dev.
  */
 static struct lock_class_key ifb_tx_queue_lock_key;
 static struct lock_class_key ifb_rx_queue_lock_key;
 
+static void set_tx_lockdep_key(struct net_device *dev,
+                               struct netdev_queue *txq,
+                               void *_unused)
+{
+        lockdep_set_class(&txq->lock, &ifb_tx_queue_lock_key);
+}
 
 static int __init ifb_init_one(int index)
 {
@@ -258,7 +264,7 @@ static int __init ifb_init_one(int index)
         if (err < 0)
                 goto err;
 
-        lockdep_set_class(&dev_ifb->tx_queue.lock, &ifb_tx_queue_lock_key);
+        netdev_for_each_tx_queue(dev_ifb, set_tx_lockdep_key, NULL);
         lockdep_set_class(&dev_ifb->rx_queue.lock, &ifb_rx_queue_lock_key);
 
         return 0;