[dpdk-stable] [PATCH 2/4] regex/mlx5: fix UAR allocation

[Viacheslav Ovsiienko <viacheslavo@nvidia.com>]

This patch provides the UAR allocation workaround for the
hosts where UAR allocation with Write-Combining memory
mapping type fails.

Fixes: b34d816363b5 ("regex/mlx5: support rules import")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/regex/mlx5/mlx5_regex.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/regex/mlx5/mlx5_regex.c b/drivers/regex/mlx5/mlx5_regex.c
index 17590b9..05048e7 100644
--- a/drivers/regex/mlx5/mlx5_regex.c
+++ b/drivers/regex/mlx5/mlx5_regex.c
@@ -176,7 +176,12 @@
 		rte_errno = ENOMEM;
 		goto error;
 	}
-	priv->uar = mlx5_glue->devx_alloc_uar(ctx, 0);
+	/*
+	 * This PMD always claims the write memory barrier on UAR
+	 * registers writings, it is safe to allocate UAR with any
+	 * memory mapping type.
+	 */
+	priv->uar = mlx5_devx_alloc_uar(ctx, -1);
 	if (!priv->uar) {
 		DRV_LOG(ERR, "can't allocate uar.");
 		rte_errno = ENOMEM;
-- 
1.8.3.1