[PATCH 4.4 057/114] ixgbe: fix RSS limit for X550

Greg Kroah-Hartman
2018-11-08T21:51:12Z

[ Upstream commit e9ee3238f8a480bbca58e51d02a93628d7c1f265 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/ixgbe/ixgbe.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 1d2174526a4c..18e4e4a69262 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -312,7 +312,7 @@ 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
--
2.17.1