From 6e11d1578fba8d09d03a286740ffcf336d53928c Mon Sep 17 00:00:00 2001 From: Amritha Nambiar Date: Mon, 24 Feb 2020 10:56:00 -0800 Subject: [PATCH] net: Fix Tx hash bound checking 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: 1b837d489e06 ("net: Revoke export for __skb_tx_hash, update it to just be static skb_tx_hash") Fixes: eadec877ce9c ("net: Add support for subordinate traffic classes to netdev_pick_tx") Signed-off-by: Amritha Nambiar Reviewed-by: Alexander Duyck Reviewed-by: Sridhar Samudrala Signed-off-by: David S. Miller --- net/core/dev.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/core/dev.c b/net/core/dev.c index e10bd680dc03..c6c985fe7b1b 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3076,6 +3076,8 @@ static u16 skb_tx_hash(const struct net_device *dev, if (skb_rx_queue_recorded(skb)) { hash = skb_get_rx_queue(skb); + if (hash >= qoffset) + hash -= qoffset; while (unlikely(hash >= qcount)) hash -= qcount; return hash + qoffset; -- 2.11.0