[Intel-wired-lan] [PATCH] ixgbe: fix RSS limit for X550

[Intel-wired-lan] [PATCH] ixgbe: fix RSS limit for X550

[Emil Tantilov]

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>
---
 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 f4c9a42..4b9156c 100644
--- 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

[Intel-wired-lan] [PATCH] ixgbe: fix RSS limit for X550

[Schmitt, Phillip J]

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On
> Behalf Of Emil Tantilov
> Sent: Friday, November 20, 2015 1:02 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH] ixgbe: fix RSS limit for X550
> 
> 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>