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

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Message-Id: <20181108215106.271459865@linuxfoundation.org>
Date:   Thu,  8 Nov 2018 13:51:12 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Emil Tantilov <emil.s.tantilov@...el.com>,
        Phil Schmitt <phillip.j.schmitt@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 057/114] ixgbe: fix RSS limit for X550

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ 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@...el.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.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