net: Split core bits of netdev_pick_tx into __netdev_pick_tx

This change splits the core bits of netdev_pick_tx into a separate function.
The main idea behind this is to make this code accessible to select queue
functions when they decide to process the standard path instead of their
own custom path in their select queue routine.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 25 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 4794cae84939..81ff67149f62 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2495,37 +2495,44 @@ static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
 #endif
 }
 
-struct netdev_queue *netdev_pick_tx(struct net_device *dev,
-                                    struct sk_buff *skb)
+u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
 {
-        int queue_index;
-        const struct net_device_ops *ops = dev->netdev_ops;
-
-        if (dev->real_num_tx_queues == 1)
-                queue_index = 0;
-        else if (ops->ndo_select_queue) {
-                queue_index = ops->ndo_select_queue(dev, skb);
-                queue_index = dev_cap_txqueue(dev, queue_index);
-        } else {
-                struct sock *sk = skb->sk;
-                queue_index = sk_tx_queue_get(sk);
+        struct sock *sk = skb->sk;
+        int queue_index = sk_tx_queue_get(sk);
 
-                if (queue_index < 0 || skb->ooo_okay ||
-                    queue_index >= dev->real_num_tx_queues) {
-                        int old_index = queue_index;
+        if (queue_index < 0 || skb->ooo_okay ||
+            queue_index >= dev->real_num_tx_queues) {
+                int new_index = get_xps_queue(dev, skb);
+                if (new_index < 0)
+                        new_index = skb_tx_hash(dev, skb);
 
-                        queue_index = get_xps_queue(dev, skb);
-                        if (queue_index < 0)
-                                queue_index = skb_tx_hash(dev, skb);
-
-                        if (queue_index != old_index && sk) {
-                                struct dst_entry *dst =
+                if (queue_index != new_index && sk) {
+                        struct dst_entry *dst =
                                     rcu_dereference_check(sk->sk_dst_cache, 1);
 
-                                if (dst && skb_dst(skb) == dst)
-                                        sk_tx_queue_set(sk, queue_index);
-                        }
+                        if (dst && skb_dst(skb) == dst)
+                                sk_tx_queue_set(sk, queue_index);
+
                 }
+
+                queue_index = new_index;
+        }
+
+        return queue_index;
+}
+
+struct netdev_queue *netdev_pick_tx(struct net_device *dev,
+                                    struct sk_buff *skb)
+{
+        int queue_index = 0;
+
+        if (dev->real_num_tx_queues != 1) {
+                const struct net_device_ops *ops = dev->netdev_ops;
+                if (ops->ndo_select_queue)
+                        queue_index = ops->ndo_select_queue(dev, skb);
+                else
+                        queue_index = __netdev_pick_tx(dev, skb);
+                queue_index = dev_cap_txqueue(dev, queue_index);
         }
 
         skb_set_queue_mapping(skb, queue_index);