[dpdk-dev] [PATCH] net/mlx5: cleanup the allocation of the buffer used for the ethtool stats

[Thierry Herbelot <thierry.herbelot@6wind.com>]

Simplify the computation for the needed size:
- exact size for the structure header,
- exact size for a number of 64-bit counters.

Fixes: a4193ae3bc4f ('net/mlx5: support extended statistics')

Signed-off-by: Thierry Herbelot <thierry.herbelot@6wind.com>
---
 drivers/net/mlx5/mlx5_stats.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_stats.c b/drivers/net/mlx5/mlx5_stats.c
index 5e225d3740d2..2427585f71ca 100644
--- a/drivers/net/mlx5/mlx5_stats.c
+++ b/drivers/net/mlx5/mlx5_stats.c
@@ -143,11 +143,9 @@ priv_read_dev_counters(struct priv *priv, uint64_t *stats)
 	struct mlx5_xstats_ctrl *xstats_ctrl = &priv->xstats_ctrl;
 	unsigned int i;
 	struct ifreq ifr;
-	unsigned int stats_sz = (xstats_ctrl->stats_n * sizeof(uint64_t)) +
-				 sizeof(struct ethtool_stats);
-	struct ethtool_stats et_stats[(stats_sz + (
-				      sizeof(struct ethtool_stats) - 1)) /
-				      sizeof(struct ethtool_stats)];
+	unsigned int stats_sz = xstats_ctrl->stats_n * sizeof(uint64_t);
+	unsigned char et_stat_buf[sizeof(struct ethtool_stats) + stats_sz];
+	struct ethtool_stats *et_stats = (struct ethtool_stats *)et_stat_buf;
 
 	et_stats->cmd = ETHTOOL_GSTATS;
 	et_stats->n_stats = xstats_ctrl->stats_n;
-- 
2.11.0