From a2248fd05dc3eda89f5b98f5dd07eb95cf24d333 Mon Sep 17 00:00:00 2001
From: Seth Howell <seth.howell@intel.com>
Date: Tue, 19 Mar 2019 14:58:39 -0700
Subject: [PATCH] env: add flag RING_F_EXACT_SZ to spdk_ring_create

This flag is needed to enssure that we can access all of the elements in
the ring. Otherwise we end up being able to access n-1 elements.

Change-Id: I7a9216e69c0599c662e96ddbf6ee79383b6d20dd
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448489
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
---
 lib/env_dpdk/env.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/env_dpdk/env.c b/lib/env_dpdk/env.c
index ad4fef5ee..073881583 100644
--- a/lib/env_dpdk/env.c
+++ b/lib/env_dpdk/env.c
@@ -358,17 +358,17 @@ spdk_ring_create(enum spdk_ring_type type, size_t count, int socket_id)
 {
 	char ring_name[64];
 	static uint32_t ring_num = 0;
-	unsigned flags = 0;
+	unsigned flags = RING_F_EXACT_SZ;
 
 	switch (type) {
 	case SPDK_RING_TYPE_SP_SC:
-		flags = RING_F_SP_ENQ | RING_F_SC_DEQ;
+		flags |= RING_F_SP_ENQ | RING_F_SC_DEQ;
 		break;
 	case SPDK_RING_TYPE_MP_SC:
-		flags = RING_F_SC_DEQ;
+		flags |= RING_F_SC_DEQ;
 		break;
 	case SPDK_RING_TYPE_MP_MC:
-		flags = 0;
+		flags |= 0;
 		break;
 	default:
 		return NULL;