netdev: Move _xmit_lock and xmit_lock_owner into netdev_queue.

Accesses are mostly structured such that when there are multiple TX
queues the code transformations will be a little bit simpler.

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

1 files changed, 39 insertions, 23 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 28aa8e77cee9..c8d5f128858d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -453,6 +453,8 @@ struct netdev_queue {
         struct net_device       *dev;
         struct Qdisc            *qdisc;
         struct sk_buff          *gso_skb;
+        spinlock_t              _xmit_lock;
+        int                     xmit_lock_owner;
         struct Qdisc            *qdisc_sleeping;
         struct list_head        qdisc_list;
         struct netdev_queue     *next_sched;
@@ -639,12 +641,6 @@ struct net_device
 /*
  * One part is mostly used on xmit path (device)
  */
-        /* hard_start_xmit synchronizer */
-        spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
-        /* cpu id of processor entered to hard_start_xmit or -1,
-           if nobody entered there.
-         */
-        int                     xmit_lock_owner;
         void                    *priv;  /* pointer to private data      */
         int                     (*hard_start_xmit) (struct sk_buff *skb,
                                                     struct net_device *dev);
@@ -1402,52 +1398,72 @@ static inline void netif_rx_complete(struct net_device *dev,
  *
  * Get network device transmit lock
  */
-static inline void __netif_tx_lock(struct net_device *dev, int cpu)
+static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
 {
-        spin_lock(&dev->_xmit_lock);
-        dev->xmit_lock_owner = cpu;
+        spin_lock(&txq->_xmit_lock);
+        txq->xmit_lock_owner = cpu;
 }
 
 static inline void netif_tx_lock(struct net_device *dev)
 {
-        __netif_tx_lock(dev, smp_processor_id());
+        __netif_tx_lock(&dev->tx_queue, smp_processor_id());
+}
+
+static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
+{
+        spin_lock_bh(&txq->_xmit_lock);
+        txq->xmit_lock_owner = smp_processor_id();
 }
 
 static inline void netif_tx_lock_bh(struct net_device *dev)
 {
-        spin_lock_bh(&dev->_xmit_lock);
-        dev->xmit_lock_owner = smp_processor_id();
+        __netif_tx_lock_bh(&dev->tx_queue);
 }
 
-static inline int netif_tx_trylock(struct net_device *dev)
+static inline int __netif_tx_trylock(struct netdev_queue *txq)
 {
-        int ok = spin_trylock(&dev->_xmit_lock);
+        int ok = spin_trylock(&txq->_xmit_lock);
         if (likely(ok))
-                dev->xmit_lock_owner = smp_processor_id();
+                txq->xmit_lock_owner = smp_processor_id();
         return ok;
 }
 
+static inline int netif_tx_trylock(struct net_device *dev)
+{
+        return __netif_tx_trylock(&dev->tx_queue);
+}
+
+static inline void __netif_tx_unlock(struct netdev_queue *txq)
+{
+        txq->xmit_lock_owner = -1;
+        spin_unlock(&txq->_xmit_lock);
+}
+
 static inline void netif_tx_unlock(struct net_device *dev)
 {
-        dev->xmit_lock_owner = -1;
-        spin_unlock(&dev->_xmit_lock);
+        __netif_tx_unlock(&dev->tx_queue);
+}
+
+static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
+{
+        txq->xmit_lock_owner = -1;
+        spin_unlock_bh(&txq->_xmit_lock);
 }
 
 static inline void netif_tx_unlock_bh(struct net_device *dev)
 {
-        dev->xmit_lock_owner = -1;
-        spin_unlock_bh(&dev->_xmit_lock);
+        __netif_tx_unlock_bh(&dev->tx_queue);
 }
 
-#define HARD_TX_LOCK(dev, cpu) {                        \
+#define HARD_TX_LOCK(dev, txq, cpu) {                   \
         if ((dev->features & NETIF_F_LLTX) == 0) {      \
-                __netif_tx_lock(dev, cpu);                      \
+                __netif_tx_lock(txq, cpu);              \
         }                                               \
 }
 
-#define HARD_TX_UNLOCK(dev) {                           \
+#define HARD_TX_UNLOCK(dev, txq) {                      \
         if ((dev->features & NETIF_F_LLTX) == 0) {      \
-                netif_tx_unlock(dev);                   \
+                __netif_tx_unlock(txq);                 \
         }                                               \
 }