regex/mlx5: fix UAR allocation

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>

diff --git a/drivers/regex/mlx5/mlx5_regex.c b/drivers/regex/mlx5/mlx5_regex.c
index 17590b937ccc5cebcf3f40450c77430afef12903..05048e7bdcc2d4691d4bba73568ee3bff57c4ded 100644 (file)
--- a/drivers/regex/mlx5/mlx5_regex.c
+++ b/drivers/regex/mlx5/mlx5_regex.c
@@ -176,7 +176,12 @@ mlx5_regex_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
                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;