net: Use sk_tx_queue_mapping for connected sockets

For connected sockets, the first run of dev_pick_tx saves the
calculated txq in sk_tx_queue_mapping. This is not saved if
either the device has a queue select or the socket is not
connected. Next iterations of dev_pick_tx uses the cached value
of sk_tx_queue_mapping.

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 28b0b9e..fa88dcd 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1791,13 +1791,25 @@ EXPORT_SYMBOL(skb_tx_hash);
 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
                                        struct sk_buff *skb)
 {
-       const struct net_device_ops *ops = dev->netdev_ops;
-       u16 queue_index = 0;
+       u16 queue_index;
+       struct sock *sk = skb->sk;
+
+       if (sk_tx_queue_recorded(sk)) {
+               queue_index = sk_tx_queue_get(sk);
+       } else {
+               const struct net_device_ops *ops = dev->netdev_ops;
 
-       if (ops->ndo_select_queue)
-               queue_index = ops->ndo_select_queue(dev, skb);
-       else if (dev->real_num_tx_queues > 1)
-               queue_index = skb_tx_hash(dev, skb);
+               if (ops->ndo_select_queue) {
+                       queue_index = ops->ndo_select_queue(dev, skb);
+               } else {
+                       queue_index = 0;
+                       if (dev->real_num_tx_queues > 1)
+                               queue_index = skb_tx_hash(dev, skb);
+
+                       if (sk && sk->sk_dst_cache)
+                               sk_tx_queue_set(sk, queue_index);
+               }
+       }
 
        skb_set_queue_mapping(skb, queue_index);
        return netdev_get_tx_queue(dev, queue_index);