ixgbe: Distribute transmission of FCoE traffic in 82599

This adds a simple selection of a FCoE tx queue based on the current cpu id to
distribute transmission of FCoE traffic evenly among multiple FCoE transmit
queues.

Signed-off-by: Yi Zou <yi.zou@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 724754a..45bf8b9 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -5168,9 +5168,15 @@ static netdev_tx_t ixgbe_xmit_frame(struct sk_buff *skb,
        tx_ring = &adapter->tx_ring[r_idx];
 
        if ((adapter->flags & IXGBE_FLAG_FCOE_ENABLED) &&
-           (skb->protocol == htons(ETH_P_FCOE)))
+           (skb->protocol == htons(ETH_P_FCOE))) {
                tx_flags |= IXGBE_TX_FLAGS_FCOE;
-
+#ifdef IXGBE_FCOE
+               r_idx = smp_processor_id();
+               r_idx &= (adapter->ring_feature[RING_F_FCOE].indices - 1);
+               r_idx += adapter->ring_feature[RING_F_FCOE].mask;
+               tx_ring = &adapter->tx_ring[r_idx];
+#endif
+       }
        /* four things can cause us to need a context descriptor */
        if (skb_is_gso(skb) ||
            (skb->ip_summed == CHECKSUM_PARTIAL) ||