ixgbe: Refactor MSI-X allocation mechanism

Our current MSI-X allocation mechanism does not support new hardware
at all.  It also isn't getting the actual number of supported MSI-X vectors
from the device.

This patch allows the number of MSI-X vectors to be specific to a device,
plus it gets the number of MSI-X vectors available from PCIe configuration
space.

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>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index 6ac361a4b8ad..341d8b555f17 100644
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -204,9 +204,13 @@ struct ixgbe_q_vector {
 #define OTHER_VECTOR 1
 #define NON_Q_VECTORS (OTHER_VECTOR)
 
-#define MAX_MSIX_Q_VECTORS 16
+#define MAX_MSIX_VECTORS_82598 18
+#define MAX_MSIX_Q_VECTORS_82598 16
+
+#define MAX_MSIX_Q_VECTORS MAX_MSIX_Q_VECTORS_82598
+#define MAX_MSIX_COUNT MAX_MSIX_VECTORS_82598
+
 #define MIN_MSIX_Q_VECTORS 2
-#define MAX_MSIX_COUNT (MAX_MSIX_Q_VECTORS + NON_Q_VECTORS)
 #define MIN_MSIX_COUNT (MIN_MSIX_Q_VECTORS + NON_Q_VECTORS)
 
 /* board specific private data structure */
@@ -244,6 +248,7 @@ struct ixgbe_adapter {
         u64 hw_csum_rx_good;
         u64 non_eop_descs;
         int num_msix_vectors;
+        int max_msix_q_vectors;         /* true count of q_vectors for device */
         struct ixgbe_ring_feature ring_feature[3];
         struct msix_entry *msix_entries;