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skb: expose and constify hash primitives 

Some minor changes to queue hashing:
 1. Use const on accessor functions
 2. Export skb_tx_hash for use in drivers (see ixgbe)

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2009-03-21 13:39:26 -07:00 committed by David S. Miller
parent 1f1900f935
commit 9247744e5e
2 changed files with 8 additions and 4 deletions
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9
include/linux/skbuff.h
View File

@ -1969,7 +1969,7 @@ static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping)
skb->queue_mapping = queue_mapping;
}
static inline u16 skb_get_queue_mapping(struct sk_buff *skb)
static inline u16 skb_get_queue_mapping(const struct sk_buff *skb)
{
return skb->queue_mapping;
}
@ -1984,16 +1984,19 @@ static inline void skb_record_rx_queue(struct sk_buff *skb, u16 rx_queue)
skb->queue_mapping = rx_queue + 1;
}
static inline u16 skb_get_rx_queue(struct sk_buff *skb)
static inline u16 skb_get_rx_queue(const struct sk_buff *skb)
{
return skb->queue_mapping - 1;
}
static inline bool skb_rx_queue_recorded(struct sk_buff *skb)
static inline bool skb_rx_queue_recorded(const struct sk_buff *skb)
{
return (skb->queue_mapping != 0);
}
extern u16 skb_tx_hash(const struct net_device *dev,
const struct sk_buff *skb);
#ifdef CONFIG_XFRM
static inline struct sec_path *skb_sec_path(struct sk_buff *skb)
{

3
net/core/dev.c
View File

@ -1725,7 +1725,7 @@ out_kfree_skb:
static u32 skb_tx_hashrnd;
static u16 skb_tx_hash(struct net_device *dev, struct sk_buff *skb)
u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
{
u32 hash;
@ -1740,6 +1740,7 @@ static u16 skb_tx_hash(struct net_device *dev, struct sk_buff *skb)
return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
}
EXPORT_SYMBOL(skb_tx_hash);
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
struct sk_buff *skb)