Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[net-next-2.6.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index 92482d7a87a9baaf3dc7140e06f5f8fa9e077cf7..eb4201cf9c8c730ddb1b040ecb205e72b8c96935 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1550,6 +1550,24 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
        rcu_read_unlock();
 }
 
+/*
+ * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
+ * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
+ */
+void netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
+{
+       unsigned int real_num = dev->real_num_tx_queues;
+
+       if (unlikely(txq > dev->num_tx_queues))
+               ;
+       else if (txq > real_num)
+               dev->real_num_tx_queues = txq;
+       else if (txq < real_num) {
+               dev->real_num_tx_queues = txq;
+               qdisc_reset_all_tx_gt(dev, txq);
+       }
+}
+EXPORT_SYMBOL(netif_set_real_num_tx_queues);
 
 static inline void __netif_reschedule(struct Qdisc *q)
 {