From: Eli Cohen <eli@mellanox.com>
Date: Sun, 1 Mar 2020 15:31:49 +0200
Subject: net/mlx5: Avoid configuring eswitch QoS if not supported
Patch-mainline: v5.7-rc1
Git-commit: b5f814cc7381e58877ebc9178283e28725c1b4f0
References: jsc#SLE-15172

Check if QoS is enabled for the eswitch before attempting to configure
QoS parameters and emit a netlink error if not supported.

Introduce an API to check if QoS is supported for the eswitch.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c   |    6 ++++++
 drivers/net/ethernet/mellanox/mlx5/core/eswitch.h |    5 +++++
 2 files changed, 11 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -4522,8 +4522,14 @@ static int scan_tc_matchall_fdb_actions(
 int mlx5e_tc_configure_matchall(struct mlx5e_priv *priv,
 				struct tc_cls_matchall_offload *ma)
 {
+	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
 	struct netlink_ext_ack *extack = ma->common.extack;
 
+	if (!mlx5_esw_qos_enabled(esw)) {
+		NL_SET_ERR_MSG_MOD(extack, "QoS is not supported on this device");
+		return -EOPNOTSUPP;
+	}
+
 	if (ma->common.prio != 1) {
 		NL_SET_ERR_MSG_MOD(extack, "only priority 1 is supported");
 		return -EINVAL;
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -453,6 +453,11 @@ int mlx5_esw_create_vport_egress_acl_vla
 					  struct mlx5_vport *vport,
 					  u16 vlan_id, u32 flow_action);
 
+static inline bool mlx5_esw_qos_enabled(struct mlx5_eswitch *esw)
+{
+	return esw->qos.enabled;
+}
+
 static inline bool mlx5_eswitch_vlan_actions_supported(struct mlx5_core_dev *dev,
 						       u8 vlan_depth)
 {