ixgbe: fix tx queue index

Don't do the num_tx_queues based masking on calculating tx queue
index.

 1) num_tx_queues is not always power-of-2, because it also depends on
    the online cpu numbers. So the masking could be a performance bug
    on a 6 cpu system.
 2) queue_mapping will be limited by real_num_tx_queues=num_tx_queues
    in the generic netdev function set_cur_queue_map(). So the bound
    limiting here is not necessary.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 9ef128a..862dd34 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -4342,7 +4342,7 @@ static int ixgbe_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
        int count = 0;
        unsigned int f;
 
-       r_idx = (adapter->num_tx_queues - 1) & skb->queue_mapping;
+       r_idx = skb->queue_mapping;
        tx_ring = &adapter->tx_ring[r_idx];
 
        if (adapter->vlgrp && vlan_tx_tag_present(skb)) {