ixgbe: fix RSS limit for X550

BugLink: http://bugs.launchpad.net/bugs/1536473
X550 allows for up to 64 RSS queues, but the driver can have max
of 63 (-1 MSIX vector for link).

On systems with >= 64 CPUs the driver will set the redirection table
for all 64 queues which will result in packets being dropped.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit e9ee3238f8a480bbca58e51d02a93628d7c1f265)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index f4c9a42dafcfb018d3b9b34a9d8bd72d09c5fc09..4b9156cd8b93c542828e84fcd6dda0fb6d882e99 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -317,7 +317,7 @@ enum ixgbe_ring_f_enum {
 };
 
 #define IXGBE_MAX_RSS_INDICES          16
-#define IXGBE_MAX_RSS_INDICES_X550     64
+#define IXGBE_MAX_RSS_INDICES_X550     63
 #define IXGBE_MAX_VMDQ_INDICES         64
 #define IXGBE_MAX_FDIR_INDICES         63      /* based on q_vector limit */
 #define IXGBE_MAX_FCOE_INDICES         8