net/mlx5e: Offload tc vlan push/pop using HW action

Currently, we are emulating the offload of vlan push/pop actions using
global setup as done by commit f5f82476 ("net/mlx5: E-Switch, Support
VLAN actions in the offloads mode"). With newer NICs, we can apply a flow
action for that matter, do that while keeping the emulated path for the
older HW brands.
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: NMark Bloch <markb@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -2530,12 +2530,17 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
 			if (tcf_vlan_action(a) == TCA_VLAN_ACT_POP) {
 				attr->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_POP;
 			} else if (tcf_vlan_action(a) == TCA_VLAN_ACT_PUSH) {
-				if (tcf_vlan_push_proto(a) != htons(ETH_P_8021Q) ||
-				    tcf_vlan_push_prio(a))
-					return -EOPNOTSUPP;
-
 				attr->action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH;
-				attr->vlan = tcf_vlan_push_vid(a);
+				attr->vlan_vid = tcf_vlan_push_vid(a);
+				if (mlx5_eswitch_vlan_actions_supported(priv->mdev)) {
+					attr->vlan_prio = tcf_vlan_push_prio(a);
+					attr->vlan_proto = tcf_vlan_push_proto(a);
+					if (!attr->vlan_proto)
+						attr->vlan_proto = htons(ETH_P_8021Q);
+				} else if (tcf_vlan_push_proto(a) != htons(ETH_P_8021Q) ||
+					   tcf_vlan_push_prio(a)) {
+					return -EOPNOTSUPP;
+				}
 			} else { /* action is TCA_VLAN_ACT_MODIFY */
 				return -EOPNOTSUPP;
 			}

drivers/net/ethernet/mellanox/mlx5/core/eswitch.h

@@ -232,7 +232,9 @@ struct mlx5_esw_flow_attr {
 	struct mlx5_eswitch_rep *out_rep;
 
 	int	action;
-	u16	vlan;
+	__be16	vlan_proto;
+	u16	vlan_vid;
+	u8	vlan_prio;
 	bool	vlan_handled;
 	u32	encap_id;
 	u32	mod_hdr_id;
@@ -255,6 +257,12 @@ int mlx5_eswitch_del_vlan_action(struct mlx5_eswitch *esw,
 int __mlx5_eswitch_set_vport_vlan(struct mlx5_eswitch *esw,
 				  int vport, u16 vlan, u8 qos, u8 set_flags);
 
+static inline bool mlx5_eswitch_vlan_actions_supported(struct mlx5_core_dev *dev)
+{
+	return MLX5_CAP_ESW_FLOWTABLE_FDB(dev, pop_vlan) &&
+	       MLX5_CAP_ESW_FLOWTABLE_FDB(dev, push_vlan);
+}
+
 #define MLX5_DEBUG_ESWITCH_MASK BIT(3)
 
 #define esw_info(dev, format, ...)				\

drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c

@@ -58,8 +58,16 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 	if (esw->mode != SRIOV_OFFLOADS)
 		return ERR_PTR(-EOPNOTSUPP);
 
-	/* per flow vlan pop/push is emulated, don't set that into the firmware */
-	flow_act.action = attr->action & ~(MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH | MLX5_FLOW_CONTEXT_ACTION_VLAN_POP);
+	flow_act.action = attr->action;
+	/* if per flow vlan pop/push is emulated, don't set that into the firmware */
+	if (!mlx5_eswitch_vlan_actions_supported(esw->dev))
+		flow_act.action &= ~(MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH |
+				     MLX5_FLOW_CONTEXT_ACTION_VLAN_POP);
+	else if (flow_act.action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH) {
+		flow_act.vlan.ethtype = ntohs(attr->vlan_proto);
+		flow_act.vlan.vid = attr->vlan_vid;
+		flow_act.vlan.prio = attr->vlan_prio;
+	}
 
 	if (flow_act.action & MLX5_FLOW_CONTEXT_ACTION_FWD_DEST) {
 		dest[i].type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
@@ -185,7 +193,7 @@ static int esw_add_vlan_action_check(struct mlx5_esw_flow_attr *attr,
 	/* protects against (1) setting rules with different vlans to push and
 	 * (2) setting rules w.o vlans (attr->vlan = 0) && w. vlans to push (!= 0)
 	 */
-	if (push && in_rep->vlan_refcount && (in_rep->vlan != attr->vlan))
+	if (push && in_rep->vlan_refcount && (in_rep->vlan != attr->vlan_vid))
 		goto out_notsupp;
 
 	return 0;
@@ -202,6 +210,10 @@ int mlx5_eswitch_add_vlan_action(struct mlx5_eswitch *esw,
 	bool push, pop, fwd;
 	int err = 0;
 
+	/* nop if we're on the vlan push/pop non emulation mode */
+	if (mlx5_eswitch_vlan_actions_supported(esw->dev))
+		return 0;
+
 	push = !!(attr->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH);
 	pop  = !!(attr->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_POP);
 	fwd  = !!(attr->action & MLX5_FLOW_CONTEXT_ACTION_FWD_DEST);
@@ -239,11 +251,11 @@ int mlx5_eswitch_add_vlan_action(struct mlx5_eswitch *esw,
 		if (vport->vlan_refcount)
 			goto skip_set_push;
 
-		err = __mlx5_eswitch_set_vport_vlan(esw, vport->vport, attr->vlan, 0,
+		err = __mlx5_eswitch_set_vport_vlan(esw, vport->vport, attr->vlan_vid, 0,
 						    SET_VLAN_INSERT | SET_VLAN_STRIP);
 		if (err)
 			goto out;
-		vport->vlan = attr->vlan;
+		vport->vlan = attr->vlan_vid;
 skip_set_push:
 		vport->vlan_refcount++;
 	}
@@ -261,6 +273,10 @@ int mlx5_eswitch_del_vlan_action(struct mlx5_eswitch *esw,
 	bool push, pop, fwd;
 	int err = 0;
 
+	/* nop if we're on the vlan push/pop non emulation mode */
+	if (mlx5_eswitch_vlan_actions_supported(esw->dev))
+		return 0;
+
 	if (!attr->vlan_handled)
 		return 0;