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| author | Vladislav Zolotarov <vladz@broadcom.com> | 2010-12-13 06:27:10 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-12-16 13:15:53 -0800 |
| commit | a3d22a68d752ccc1a01bb0a64dd70b7a98bf9e23 (patch) | |
| tree | e51c231b29d8e285acb8196b6b893c718febd2b1 /net/core/dev.c | |
| parent | d33e455337ea2c71d09d7f4367d6ad6dd32b6965 (diff) | |
| download | lwn-a3d22a68d752ccc1a01bb0a64dd70b7a98bf9e23.tar.gz lwn-a3d22a68d752ccc1a01bb0a64dd70b7a98bf9e23.zip | |
bnx2x: Take the distribution range definition out of skb_tx_hash()
Move the calcualation of the Tx hash for a given hash range into a separate
function and define the skb_tx_hash(), which calculates a Tx hash for a
[0; dev->real_num_tx_queues - 1] hash values range, using this
function (__skb_tx_hash()).
Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index d28b3a023bb2..b25dd087f06a 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2112,14 +2112,19 @@ out: static u32 hashrnd __read_mostly; -u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb) +/* + * Returns a Tx hash based on the given packet descriptor a Tx queues' number + * to be used as a distribution range. + */ +u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb, + unsigned int num_tx_queues) { u32 hash; if (skb_rx_queue_recorded(skb)) { hash = skb_get_rx_queue(skb); - while (unlikely(hash >= dev->real_num_tx_queues)) - hash -= dev->real_num_tx_queues; + while (unlikely(hash >= num_tx_queues)) + hash -= num_tx_queues; return hash; } @@ -2129,9 +2134,9 @@ u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb) hash = (__force u16) skb->protocol ^ skb->rxhash; hash = jhash_1word(hash, hashrnd); - return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); + return (u16) (((u64) hash * num_tx_queues) >> 32); } -EXPORT_SYMBOL(skb_tx_hash); +EXPORT_SYMBOL(__skb_tx_hash); static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index) { |