[SRU][O:linux/N:linux/J:hwe-6.8][PATCH 1/1] UBUNTU: SAUCE: net/mlx5e: Remove workaround to avoid syndrome for internal port

[Jacob Martin]

From: Jianbo Liu <jianbol at nvidia.com>

BugLink: https://bugs.launchpad.net/bugs/2085018

Previously a workaround was added to avoid syndrome 0xcdb051. It is
triggered when offload a rule with tunnel encapsulation, and
forwarding to another table, but not matching on the internal port in
firmware steering mode. The original workaround skips internal tunnel
port logic, which is not correct as not all cases are considered.
Besides, there is no such issue for software steering. So, this patch
removes that, and returns error directly if trying to offload such
rule for firmware steering.

Fixes: 06b4eac9c4be ("net/mlx5e: Don't offload internal port if filter device is out device")
Signed-off-by: Jianbo Liu <jianbol at nvidia.com>
Signed-off-by: Jacob Martin <jacob.martin at canonical.com>
---
 .../ethernet/mellanox/mlx5/core/en/tc_tun_encap.c   | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
index f1d1e1542e81..c11092da2e7d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
@@ -5,6 +5,7 @@
 #include <net/nexthop.h>
 #include <net/ip_tunnels.h>
 #include "tc_tun_encap.h"
+#include "fs_core.h"
 #include "en_tc.h"
 #include "tc_tun.h"
 #include "rep/tc.h"
@@ -24,10 +25,18 @@ static int mlx5e_set_int_port_tunnel(struct mlx5e_priv *priv,
 
 	route_dev = dev_get_by_index(dev_net(e->out_dev), e->route_dev_ifindex);
 
-	if (!route_dev || !netif_is_ovs_master(route_dev) ||
-	    attr->parse_attr->filter_dev == e->out_dev)
+	if (!route_dev || !netif_is_ovs_master(route_dev))
 		goto out;
 
+	if (priv->mdev->priv.steering->mode == MLX5_FLOW_STEERING_MODE_DMFS &&
+	    mlx5e_eswitch_uplink_rep(attr->parse_attr->filter_dev) &&
+	    (attr->esw_attr->dests[out_index].flags & MLX5_ESW_DEST_ENCAP)) {
+		mlx5_core_warn(priv->mdev,
+			       "Matching on external port with encap + fwd to table actions is not allowed for firmware steering\n");
+		err = -EINVAL;
+		goto out;
+	}
+
 	err = mlx5e_set_fwd_to_int_port_actions(priv, attr, e->route_dev_ifindex,
 						MLX5E_TC_INT_PORT_EGRESS,
 						&attr->action, out_index);
-- 
2.43.0