net/mlx5: DR, Add fail on error check on decap

While processing encapsulated packet on RX, one of the fields that is
checked is the inner packet length. If the length as specified in the header
doesn't match the actual inner packet length, the packet is invalid
and should be dropped. However, such packet caused the NIC to hang.

This patch turns on a 'fail_on_error' HW bit which allows HW to drop
such an invalid packet while processing RX packet and trying to decap it.

Fixes: ad17dc8cf910 ("net/mlx5: DR, Move STEv0 action apply logic")
Signed-off-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste_v0.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste_v0.c
index f1950e4..e4dd4ee 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste_v0.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste_v0.c
@@ -352,6 +352,7 @@ static void dr_ste_v0_set_rx_decap(u8 *hw_ste_p)
 {
        MLX5_SET(ste_rx_steering_mult, hw_ste_p, tunneling_action,
                 DR_STE_TUNL_ACTION_DECAP);
+       MLX5_SET(ste_rx_steering_mult, hw_ste_p, fail_on_error, 1);
 }
 
 static void dr_ste_v0_set_rx_pop_vlan(u8 *hw_ste_p)
@@ -365,6 +366,7 @@ static void dr_ste_v0_set_rx_decap_l3(u8 *hw_ste_p, bool vlan)
        MLX5_SET(ste_rx_steering_mult, hw_ste_p, tunneling_action,
                 DR_STE_TUNL_ACTION_L3_DECAP);
        MLX5_SET(ste_modify_packet, hw_ste_p, action_description, vlan ? 1 : 0);
+       MLX5_SET(ste_rx_steering_mult, hw_ste_p, fail_on_error, 1);
 }
 
 static void dr_ste_v0_set_rewrite_actions(u8 *hw_ste_p, u16 num_of_actions,