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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>
This commit is contained in:
Alexander Duyck 2013-01-10 08:56:51 +00:00 committed by David S. Miller
parent c10d73671a
commit 416186fbf8
2 changed files with 34 additions and 26 deletions
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1
include/linux/netdevice.h
View File

@ -1403,6 +1403,7 @@ static inline void netdev_for_each_tx_queue(struct net_device *dev,
extern struct netdev_queue *netdev_pick_tx(struct net_device *dev,
struct sk_buff *skb);
extern u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb);
/*
* Net namespace inlines

59
net/core/dev.c
View File

@ -2495,37 +2495,44 @@ static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
#endif
}
u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
{
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 new_index = get_xps_queue(dev, skb);
if (new_index < 0)
new_index = skb_tx_hash(dev, skb);
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);
}
queue_index = new_index;
}
return queue_index;
}
struct netdev_queue *netdev_pick_tx(struct net_device *dev,
struct sk_buff *skb)
{
int queue_index;
const struct net_device_ops *ops = dev->netdev_ops;
int queue_index = 0;
if (dev->real_num_tx_queues == 1)
queue_index = 0;
else if (ops->ndo_select_queue) {
queue_index = ops->ndo_select_queue(dev, skb);
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);
} else {
struct sock *sk = skb->sk;
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;
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 =
rcu_dereference_check(sk->sk_dst_cache, 1);
if (dst && skb_dst(skb) == dst)
sk_tx_queue_set(sk, queue_index);
}
}
}
skb_set_queue_mapping(skb, queue_index);