From: Parav Pandit <parav@nvidia.com>
Date: Tue, 12 Jan 2021 16:13:22 +0200
Subject: net/mlx5e: E-switch, Fix rate calculation for overflow
Patch-mainline: v5.12-rc1
Git-commit: 0e22bfb7c046e7c8ae339f396e78a0976633698c
References: jsc#SLE-8464
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -4075,7 +4075,7 @@ static int apply_police_params(struct ml
*/
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);