netdev - [net 2/6] net/mlx5e: Fix port tunnel GRE entropy control

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Date:   Thu, 11 Jul 2019 18:54:13 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Eli Britstein <elibr@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net 2/6] net/mlx5e: Fix port tunnel GRE entropy control

From: Eli Britstein <elibr@...lanox.com>

GRE entropy calculation is a single bit per card, and not per port.
Force disable GRE entropy calculation upon the first GRE encap rule,
and release the force at the last GRE encap rule removal. This is done
per port.

Fixes: 97417f6182f8 ("net/mlx5e: Fix GRE key by controlling port tunnel entropy calculation")
Signed-off-by: Eli Britstein <elibr@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 .../mellanox/mlx5/core/lib/port_tun.c         | 23 ++++---------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c
index be69c1d7941a..48b5c847b642 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c
@@ -98,27 +98,12 @@ static int mlx5_set_entropy(struct mlx5_tun_entropy *tun_entropy,
 	 */
 	if (entropy_flags.gre_calc_supported &&
 	    reformat_type == MLX5_REFORMAT_TYPE_L2_TO_NVGRE) {
-		/* Other applications may change the global FW entropy
-		 * calculations settings. Check that the current entropy value
-		 * is the negative of the updated value.
-		 */
-		if (entropy_flags.force_enabled &&
-		    enable == entropy_flags.gre_calc_enabled) {
-			mlx5_core_warn(tun_entropy->mdev,
-				       "Unexpected GRE entropy calc setting - expected %d",
-				       !entropy_flags.gre_calc_enabled);
-			return -EOPNOTSUPP;
-		}
-		err = mlx5_set_port_gre_tun_entropy_calc(tun_entropy->mdev, enable,
-							 entropy_flags.force_supported);
+		if (!entropy_flags.force_supported)
+			return 0;
+		err = mlx5_set_port_gre_tun_entropy_calc(tun_entropy->mdev,
+							 enable, !enable);
 		if (err)
 			return err;
-		/* if we turn on the entropy we don't need to force it anymore */
-		if (entropy_flags.force_supported && enable) {
-			err = mlx5_set_port_gre_tun_entropy_calc(tun_entropy->mdev, 1, 0);
-			if (err)
-				return err;
-		}
 	} else if (entropy_flags.calc_supported) {
 		/* Other applications may change the global FW entropy
 		 * calculations settings. Check that the current entropy value
-- 
2.21.0