From a3d22a68d752ccc1a01bb0a64dd70b7a98bf9e23 Mon Sep 17 00:00:00 2001 From: Vladislav Zolotarov Date: Mon, 13 Dec 2010 06:27:10 +0000 Subject: [PATCH] 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 Signed-off-by: Eilon Greenstein Signed-off-by: David S. Miller --- include/linux/netdevice.h | 10 ++++++++++ include/linux/skbuff.h | 5 +++-- net/core/dev.c | 15 ++++++++++----- 3 files changed, 23 insertions(+), 7 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index d31bc3c9471..445e6825f8e 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1747,6 +1747,16 @@ static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) __netif_schedule(txq->qdisc); } +/* + * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used + * as a distribution range limit for the returned value. + */ +static inline u16 skb_tx_hash(const struct net_device *dev, + const struct sk_buff *skb) +{ + return __skb_tx_hash(dev, skb, dev->real_num_tx_queues); +} + /** * netif_is_multiqueue - test if device has multiple transmit queues * @dev: network device diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 19f37a6ee6c..4c4bec6316d 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2165,8 +2165,9 @@ 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); +extern u16 __skb_tx_hash(const struct net_device *dev, + const struct sk_buff *skb, + unsigned int num_tx_queues); #ifdef CONFIG_XFRM static inline struct sec_path *skb_sec_path(struct sk_buff *skb) diff --git a/net/core/dev.c b/net/core/dev.c index d28b3a023bb..b25dd087f06 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) { -- 2.34.1