[dpdk-stable] [PATCH v1] net/mlx5: fix meter flow id

[Shun Hao]

When getting meter flow_id bits, there's an issue that not handling
correctly if flow_id is 0.

This fix this issue that when flow_id is 0, treat it as 1 bit.

Fixes: 83306d6c46 ("net/mlx5: fix meter statistics")
Cc: stable at dpdk.org

Signed-off-by: Shun Hao <shunh at nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 32634c9af7..edfac0d99f 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -4794,8 +4794,8 @@ flow_meter_split_prep(struct rte_eth_dev *dev,
 					RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
 					"Failed to allocate meter flow id.");
 		flow_id = tag_id - 1;
-		flow_id_bits = MLX5_REG_BITS - __builtin_clz(flow_id);
-		flow_id_bits = flow_id_bits ? flow_id_bits : 1;
+		flow_id_bits = (!flow_id) ? 1 :
+				(MLX5_REG_BITS - __builtin_clz(flow_id));
 		if ((flow_id_bits + priv->sh->mtrmng->max_mtr_bits) >
 		    mtr_reg_bits) {
 			mlx5_ipool_free(fm->flow_ipool, tag_id);
-- 
2.20.0