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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>
This commit is contained in:
Wu Fengguang 2009-04-14 21:53:48 -07:00 committed by David S. Miller
parent 6fd4777a1f
commit 95615d90a3
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ixgbe/ixgbe_main.c
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@ -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)) {