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net: Avoid modulus in skb_tx_hash() for forwarding case.
Based almost entirely upon a patch by Eric Dumazet. The common case is to have num-tx-queues <= num_rx_queues and even if num_tx_queues is larger it will not be significantly larger. Therefore, a subtraction loop is always going to be faster than modulus. Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 6 additions and 2 deletions
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@ -1735,8 +1735,12 @@ u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
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{
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u32 hash;
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if (skb_rx_queue_recorded(skb))
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return skb_get_rx_queue(skb) % dev->real_num_tx_queues;
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if (skb_rx_queue_recorded(skb)) {
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hash = skb_get_rx_queue(skb);
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while (unlikely (hash >= dev->real_num_tx_queues))
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hash -= dev->real_num_tx_queues;
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return hash;
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}
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if (skb->sk && skb->sk->sk_hash)
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hash = skb->sk->sk_hash;
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