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, 26 insertions, 11 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 5ba66b555578..b47f556c66f8 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -230,32 +230,47 @@ extern void tcf_destroy_chain(struct tcf_proto **fl);
 /* Reset all TX qdiscs of a device.  */
 static inline void qdisc_reset_all_tx(struct net_device *dev)
 {
-        qdisc_reset(dev->tx_queue.qdisc);
+        unsigned int i;
+        for (i = 0; i < dev->num_tx_queues; i++)
+                qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
 }
 
 /* Are all TX queues of the device empty?  */
 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 {
-        const struct netdev_queue *txq = &dev->tx_queue;
-        const struct Qdisc *q = txq->qdisc;
+        unsigned int i;
+        for (i = 0; i < dev->num_tx_queues; i++) {
+                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
+                const struct Qdisc *q = txq->qdisc;
 
-        return (q->q.qlen == 0);
+                if (q->q.qlen)
+                        return false;
+        }
+        return true;
 }
 
 /* Are any of the TX qdiscs changing?  */
 static inline bool qdisc_tx_changing(struct net_device *dev)
 {
-        struct netdev_queue *txq = &dev->tx_queue;
-
-        return (txq->qdisc != txq->qdisc_sleeping);
+        unsigned int i;
+        for (i = 0; i < dev->num_tx_queues; i++) {
+                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
+                if (txq->qdisc != txq->qdisc_sleeping)
+                        return true;
+        }
+        return false;
 }
 
-/* Is the device using the noop qdisc?  */
+/* Is the device using the noop qdisc on all queues?  */
 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
 {
-        const struct netdev_queue *txq = &dev->tx_queue;
-
-        return (txq->qdisc == &noop_qdisc);
+        unsigned int i;
+        for (i = 0; i < dev->num_tx_queues; i++) {
+                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
+                if (txq->qdisc != &noop_qdisc)
+                        return false;
+        }
+        return true;
 }
 
 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,