ixgbe: Fix 82598 MSI-X allocation on systems with more than 8 CPU cores

MSI-X allocation broke after the 82599 merge on systems with more than 8
CPU cores.  82598 drops back into MSI mode, which isn't sufficient to run
full, efficient 10G line rate.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@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 8f6e263..63c0f19 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2934,6 +2934,7 @@ err_tx_ring_allocation:
  **/
 static int ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
 {
+       struct ixgbe_hw *hw = &adapter->hw;
        int err = 0;
        int vector, v_budget;
 
@@ -2948,12 +2949,12 @@ static int ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
 
        /*
         * At the same time, hardware can only support a maximum of
-        * MAX_MSIX_COUNT vectors.  With features such as RSS and VMDq,
-        * we can easily reach upwards of 64 Rx descriptor queues and
-        * 32 Tx queues.  Thus, we cap it off in those rare cases where
-        * the cpu count also exceeds our vector limit.
+        * hw.mac->max_msix_vectors vectors.  With features
+        * such as RSS and VMDq, we can easily surpass the number of Rx and Tx
+        * descriptor queues supported by our device.  Thus, we cap it off in
+        * those rare cases where the cpu count also exceeds our vector limit.
         */
-       v_budget = min(v_budget, MAX_MSIX_COUNT);
+       v_budget = min(v_budget, (int)hw->mac.max_msix_vectors);
 
        /* A failure in MSI-X entry allocation isn't fatal, but it does
         * mean we disable MSI-X capabilities of the adapter. */