net/mlx5e: Return -EOPNOTSUPP when attempting to offload an unsupported action

* Now the encapsulation is not supported for mlx5 VFs. When we try to
offload that action, the -EINVAL is returned, but not -EOPNOTSUPP.
This patch changes the returned value and ignore to confuse user.
The command is shown as below [1].

* When max modify header action is zero, we return -EOPNOTSUPP
directly. In this way, we can ignore wrong message info (e.g.
"mlx5: parsed 0 pedit actions, can't do more"). This happens when
offloading pedit actions on mlx(cx4) VFs. The command is shown as below [2].

For example: (p2p1_0 is VF net device)
[1]
$ tc filter add dev p2p1_0 protocol ip  parent ffff: prio 1 flower skip_sw \
    src_mac e4:11:22:33:44:01    \
    action tunnel_key set        \
    src_ip 1.1.1.100        \
    dst_ip 1.1.1.200        \
    dst_port 4789 id 100        \
    action mirred egress redirect dev vxlan0

[2]
$ tc filter add dev p2p1_0 parent ffff: protocol ip prio 1 \
    flower skip_sw dst_mac 00:10:56:fb:64:e8 \
    dst_ip 1.1.1.100 src_ip 1.1.1.200 \
    action pedit ex munge eth src set 00:10:56:b4:5d:20

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 26c5548..7c1ea0a 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2029,6 +2029,15 @@ static int offload_pedit_fields(struct pedit_headers_action *hdrs,
        return 0;
 }
 
+static int mlx5e_flow_namespace_max_modify_action(struct mlx5_core_dev *mdev,
+                                                 int namespace)
+{
+       if (namespace == MLX5_FLOW_NAMESPACE_FDB) /* FDB offloading */
+               return MLX5_CAP_ESW_FLOWTABLE_FDB(mdev, max_modify_header_actions);
+       else /* namespace is MLX5_FLOW_NAMESPACE_KERNEL - NIC offloading */
+               return MLX5_CAP_FLOWTABLE_NIC_RX(mdev, max_modify_header_actions);
+}
+
 static int alloc_mod_hdr_actions(struct mlx5e_priv *priv,
                                 struct pedit_headers_action *hdrs,
                                 int namespace,
@@ -2040,11 +2049,7 @@ static int alloc_mod_hdr_actions(struct mlx5e_priv *priv,
                hdrs[TCA_PEDIT_KEY_EX_CMD_ADD].pedits;
        action_size = MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto);
 
-       if (namespace == MLX5_FLOW_NAMESPACE_FDB) /* FDB offloading */
-               max_actions = MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, max_modify_header_actions);
-       else /* namespace is MLX5_FLOW_NAMESPACE_KERNEL - NIC offloading */
-               max_actions = MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, max_modify_header_actions);
-
+       max_actions = mlx5e_flow_namespace_max_modify_action(priv->mdev, namespace);
        /* can get up to crazingly 16 HW actions in 32 bits pedit SW key */
        max_actions = min(max_actions, nkeys * 16);
 
@@ -2077,6 +2082,12 @@ static int parse_tc_pedit_action(struct mlx5e_priv *priv,
                goto out_err;
        }
 
+       if (!mlx5e_flow_namespace_max_modify_action(priv->mdev, namespace)) {
+               NL_SET_ERR_MSG_MOD(extack,
+                                  "The pedit offload action is not supported");
+               goto out_err;
+       }
+
        mask = act->mangle.mask;
        val = act->mangle.val;
        offset = act->mangle.offset;
@@ -2362,7 +2373,8 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv,
                        }
                        break;
                default:
-                       return -EINVAL;
+                       NL_SET_ERR_MSG_MOD(extack, "The offload action is not supported");
+                       return -EOPNOTSUPP;
                }
        }
 
@@ -2710,7 +2722,8 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
                        break;
                        }
                default:
-                       return -EINVAL;
+                       NL_SET_ERR_MSG_MOD(extack, "The offload action is not supported");
+                       return -EOPNOTSUPP;
                }
        }