From: Max Gurtovoy <maxg@mellanox.com>
Date: Mon, 5 Feb 2018 16:29:51 +0200
Subject: net/mlx5: increase async EQ to avoid EQ overrun
Patch-mainline: v4.16-rc1
Git-commit: 03ecdd2dcf39834ff2b012a8b29168d7076da84a
References: bsc#1103990 FATE#326006

Currently the async EQ has 256 entries only. It might not be big enough
for the SW to handle all the needed pending events. For example, in case
of many QPs (let's say 1024) connected to a SRQ created using NVMeOF target
and the target goes down, the FW will raise 1024 "last WQE reached" events
and may cause EQ overrun. Increase the EQ to more reasonable size, that beyond
it the FW should be able to delay the event and raise it later on using internal
backpressure mechanism.

Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -51,7 +51,7 @@ enum {
 
 enum {
 	MLX5_NUM_SPARE_EQE	= 0x80,
-	MLX5_NUM_ASYNC_EQE	= 0x100,
+	MLX5_NUM_ASYNC_EQE	= 0x1000,
 	MLX5_NUM_CMD_EQE	= 32,
 	MLX5_NUM_PF_DRAIN	= 64,
 };