net/mlx5e: E-switch, Fix rate calculation for overflow

rate_bytes_ps is a 64-bit field. It passed as 32-bit field to
apply_police_params(). Due to this when police rate is higher
than 4Gbps, 32-bit calculation ignores the carry. This results
in incorrect rate configurationn the device.

Fix it by performing 64-bit calculation.

Fixes: fcb64c0f5640 ("net/mlx5: E-Switch, add ingress rate support")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index dd0bfbacad47417149a99a17ed2c38d02b3351db..717fbaa6ce73657b36de5c6717b236c204105cd8 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -5040,7 +5040,7 @@ static int apply_police_params(struct mlx5e_priv *priv, u64 rate,
         */
        if (rate) {
                rate = (rate * BITS_PER_BYTE) + 500000;
-               rate_mbps = max_t(u32, do_div(rate, 1000000), 1);
+               rate_mbps = max_t(u64, do_div(rate, 1000000), 1);
        }
 
        err = mlx5_esw_modify_vport_rate(esw, vport_num, rate_mbps);