net: Fix Tx hash bound checking
commit5.4-rM2-2.2.x-imx-squashed6e11d1578f
upstream. Fixes the lower and upper bounds when there are multiple TCs and traffic is on the the same TC on the same device. The lower bound is represented by 'qoffset' and the upper limit for hash value is 'qcount + qoffset'. This gives a clean Rx to Tx queue mapping when there are multiple TCs, as the queue indices for upper TCs will be offset by 'qoffset'. v2: Fixed commit description based on comments. Fixes:1b837d489e
("net: Revoke export for __skb_tx_hash, update it to just be static skb_tx_hash") Fixes:eadec877ce
("net: Add support for subordinate traffic classes to netdev_pick_tx") Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com> Reviewed-by: Alexander Duyck <alexander.h.duyck@linux.intel.com> Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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15ee8da79e
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238112fcf3
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@ -2795,6 +2795,8 @@ static u16 skb_tx_hash(const struct net_device *dev,
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if (skb_rx_queue_recorded(skb)) {
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hash = skb_get_rx_queue(skb);
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if (hash >= qoffset)
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hash -= qoffset;
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while (unlikely(hash >= qcount))
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hash -= qcount;
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return hash + qoffset;
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