net/mlx5e: Split offloaded eswitch TC rules for port mirroring

If a TC rule needs to be split for mirroring, create two HW rules,
in the first level and the second level flow tables accordingly.

In the first level flow table, forward the packet to the mirror
port and forward the packet to the second level flow table for
further processing, eg. encap, vlan push or header re-write.

Currently the matching is repeated in both stages.

While here, simplify the setup of the vhca id valid indicator also
in the existing code.

Signed-off-by: Chris Mi <chrism@mellanox.com>
Reviewed-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -75,12 +75,14 @@ enum {
 	MLX5E_TC_FLOW_HAIRPIN_RSS = BIT(MLX5E_TC_FLOW_BASE + 4),
 };
 
+#define MLX5E_TC_MAX_SPLITS 1
+
 struct mlx5e_tc_flow {
 	struct rhash_head	node;
 	struct mlx5e_priv	*priv;
 	u64			cookie;
 	u8			flags;
-	struct mlx5_flow_handle *rule;
+	struct mlx5_flow_handle *rule[MLX5E_TC_MAX_SPLITS + 1];
 	struct list_head	encap;   /* flows sharing the same encap ID */
 	struct list_head	mod_hdr; /* flows sharing the same mod hdr ID */
 	struct list_head	hairpin; /* flows sharing the same hairpin */
@@ -794,8 +796,8 @@ static void mlx5e_tc_del_nic_flow(struct mlx5e_priv *priv,
 	struct mlx5_nic_flow_attr *attr = flow->nic_attr;
 	struct mlx5_fc *counter = NULL;
 
-	counter = mlx5_flow_rule_counter(flow->rule);
-	mlx5_del_flow_rules(flow->rule);
+	counter = mlx5_flow_rule_counter(flow->rule[0]);
+	mlx5_del_flow_rules(flow->rule[0]);
 	mlx5_fc_destroy(priv->mdev, counter);
 
 	if (!mlx5e_tc_num_filters(priv) && priv->fs.tc.t) {
@@ -870,9 +872,18 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 		rule = mlx5_eswitch_add_offloaded_rule(esw, &parse_attr->spec, attr);
 		if (IS_ERR(rule))
 			goto err_add_rule;
+
+		if (attr->mirror_count) {
+			flow->rule[1] = mlx5_eswitch_add_fwd_rule(esw, &parse_attr->spec, attr);
+			if (IS_ERR(flow->rule[1]))
+				goto err_fwd_rule;
+		}
 	}
 	return rule;
 
+err_fwd_rule:
+	mlx5_eswitch_del_offloaded_rule(esw, rule, attr);
+	rule = flow->rule[1];
 err_add_rule:
 	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)
 		mlx5e_detach_mod_hdr(priv, flow);
@@ -893,7 +904,9 @@ static void mlx5e_tc_del_fdb_flow(struct mlx5e_priv *priv,
 
 	if (flow->flags & MLX5E_TC_FLOW_OFFLOADED) {
 		flow->flags &= ~MLX5E_TC_FLOW_OFFLOADED;
-		mlx5_eswitch_del_offloaded_rule(esw, flow->rule, attr);
+		if (attr->mirror_count)
+			mlx5_eswitch_del_offloaded_rule(esw, flow->rule[1], attr);
+		mlx5_eswitch_del_offloaded_rule(esw, flow->rule[0], attr);
 	}
 
 	mlx5_eswitch_del_vlan_action(esw, attr);
@@ -929,13 +942,25 @@ void mlx5e_tc_encap_flows_add(struct mlx5e_priv *priv,
 	list_for_each_entry(flow, &e->flows, encap) {
 		esw_attr = flow->esw_attr;
 		esw_attr->encap_id = e->encap_id;
-		flow->rule = mlx5_eswitch_add_offloaded_rule(esw, &esw_attr->parse_attr->spec, esw_attr);
-		if (IS_ERR(flow->rule)) {
-			err = PTR_ERR(flow->rule);
+		flow->rule[0] = mlx5_eswitch_add_offloaded_rule(esw, &esw_attr->parse_attr->spec, esw_attr);
+		if (IS_ERR(flow->rule[0])) {
+			err = PTR_ERR(flow->rule[0]);
 			mlx5_core_warn(priv->mdev, "Failed to update cached encapsulation flow, %d\n",
 				       err);
 			continue;
 		}
+
+		if (esw_attr->mirror_count) {
+			flow->rule[1] = mlx5_eswitch_add_fwd_rule(esw, &esw_attr->parse_attr->spec, esw_attr);
+			if (IS_ERR(flow->rule[1])) {
+				mlx5_eswitch_del_offloaded_rule(esw, flow->rule[0], esw_attr);
+				err = PTR_ERR(flow->rule[1]);
+				mlx5_core_warn(priv->mdev, "Failed to update cached mirror flow, %d\n",
+					       err);
+				continue;
+			}
+		}
+
 		flow->flags |= MLX5E_TC_FLOW_OFFLOADED;
 	}
 }
@@ -948,8 +973,12 @@ void mlx5e_tc_encap_flows_del(struct mlx5e_priv *priv,
 
 	list_for_each_entry(flow, &e->flows, encap) {
 		if (flow->flags & MLX5E_TC_FLOW_OFFLOADED) {
+			struct mlx5_esw_flow_attr *attr = flow->esw_attr;
+
 			flow->flags &= ~MLX5E_TC_FLOW_OFFLOADED;
-			mlx5_eswitch_del_offloaded_rule(esw, flow->rule, flow->esw_attr);
+			if (attr->mirror_count)
+				mlx5_eswitch_del_offloaded_rule(esw, flow->rule[1], attr);
+			mlx5_eswitch_del_offloaded_rule(esw, flow->rule[0], attr);
 		}
 	}
 
@@ -984,7 +1013,7 @@ void mlx5e_tc_update_neigh_used_value(struct mlx5e_neigh_hash_entry *nhe)
 			continue;
 		list_for_each_entry(flow, &e->flows, encap) {
 			if (flow->flags & MLX5E_TC_FLOW_OFFLOADED) {
-				counter = mlx5_flow_rule_counter(flow->rule);
+				counter = mlx5_flow_rule_counter(flow->rule[0]);
 				mlx5_fc_query_cached(counter, &bytes, &packets, &lastuse);
 				if (time_after((unsigned long)lastuse, nhe->reported_lastuse)) {
 					neigh_used = true;
@@ -2714,16 +2743,16 @@ int mlx5e_configure_flower(struct mlx5e_priv *priv,
 		err = parse_tc_fdb_actions(priv, f->exts, parse_attr, flow);
 		if (err < 0)
 			goto err_free;
-		flow->rule = mlx5e_tc_add_fdb_flow(priv, parse_attr, flow);
+		flow->rule[0] = mlx5e_tc_add_fdb_flow(priv, parse_attr, flow);
 	} else {
 		err = parse_tc_nic_actions(priv, f->exts, parse_attr, flow);
 		if (err < 0)
 			goto err_free;
-		flow->rule = mlx5e_tc_add_nic_flow(priv, parse_attr, flow);
+		flow->rule[0] = mlx5e_tc_add_nic_flow(priv, parse_attr, flow);
 	}
 
-	if (IS_ERR(flow->rule)) {
-		err = PTR_ERR(flow->rule);
+	if (IS_ERR(flow->rule[0])) {
+		err = PTR_ERR(flow->rule[0]);
 		if (err != -EAGAIN)
 			goto err_free;
 	}
@@ -2796,7 +2825,7 @@ int mlx5e_stats_flower(struct mlx5e_priv *priv,
 	if (!(flow->flags & MLX5E_TC_FLOW_OFFLOADED))
 		return 0;
 
-	counter = mlx5_flow_rule_counter(flow->rule);
+	counter = mlx5_flow_rule_counter(flow->rule[0]);
 	if (!counter)
 		return 0;
 

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

@@ -219,6 +219,10 @@ struct mlx5_flow_handle *
 mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 				struct mlx5_flow_spec *spec,
 				struct mlx5_esw_flow_attr *attr);
+struct mlx5_flow_handle *
+mlx5_eswitch_add_fwd_rule(struct mlx5_eswitch *esw,
+			  struct mlx5_flow_spec *spec,
+			  struct mlx5_esw_flow_attr *attr);
 void
 mlx5_eswitch_del_offloaded_rule(struct mlx5_eswitch *esw,
 				struct mlx5_flow_handle *rule,

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

@@ -50,6 +50,7 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 {
 	struct mlx5_flow_destination dest[MLX5_MAX_FLOW_FWD_VPORTS + 1] = {};
 	struct mlx5_flow_act flow_act = {0};
+	struct mlx5_flow_table *ft = NULL;
 	struct mlx5_fc *counter = NULL;
 	struct mlx5_flow_handle *rule;
 	int j, i = 0;
@@ -58,6 +59,11 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 	if (esw->mode != SRIOV_OFFLOADS)
 		return ERR_PTR(-EOPNOTSUPP);
 
+	if (attr->mirror_count)
+		ft = esw->fdb_table.offloads.fwd_fdb;
+	else
+		ft = esw->fdb_table.offloads.fast_fdb;
+
 	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))
@@ -73,11 +79,9 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 		for (j = attr->mirror_count; j < attr->out_count; j++) {
 			dest[i].type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
 			dest[i].vport.num = attr->out_rep[j]->vport;
-			if (MLX5_CAP_ESW(esw->dev, merged_eswitch)) {
-				dest[i].vport.vhca_id =
-					MLX5_CAP_GEN(attr->out_mdev[j], vhca_id);
-				dest[i].vport.vhca_id_valid = 1;
-			}
+			dest[i].vport.vhca_id =
+				MLX5_CAP_GEN(attr->out_mdev[j], vhca_id);
+			dest[i].vport.vhca_id_valid = !!MLX5_CAP_ESW(esw->dev, merged_eswitch);
 			i++;
 		}
 	}
@@ -121,8 +125,7 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 	if (flow_act.action & MLX5_FLOW_CONTEXT_ACTION_ENCAP)
 		flow_act.encap_id = attr->encap_id;
 
-	rule = mlx5_add_flow_rules((struct mlx5_flow_table *)esw->fdb_table.offloads.fast_fdb,
-				   spec, &flow_act, dest, i);
+	rule = mlx5_add_flow_rules(ft, spec, &flow_act, dest, i);
 	if (IS_ERR(rule))
 		goto err_add_rule;
 	else
@@ -136,6 +139,57 @@ err_counter_alloc:
 	return rule;
 }
 
+struct mlx5_flow_handle *
+mlx5_eswitch_add_fwd_rule(struct mlx5_eswitch *esw,
+			  struct mlx5_flow_spec *spec,
+			  struct mlx5_esw_flow_attr *attr)
+{
+	struct mlx5_flow_destination dest[MLX5_MAX_FLOW_FWD_VPORTS + 1] = {};
+	struct mlx5_flow_act flow_act = {0};
+	struct mlx5_flow_handle *rule;
+	void *misc;
+	int i;
+
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	for (i = 0; i < attr->mirror_count; i++) {
+		dest[i].type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
+		dest[i].vport.num = attr->out_rep[i]->vport;
+		dest[i].vport.vhca_id =
+			MLX5_CAP_GEN(attr->out_mdev[i], vhca_id);
+		dest[i].vport.vhca_id_valid = !!MLX5_CAP_ESW(esw->dev, merged_eswitch);
+	}
+	dest[i].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+	dest[i].ft = esw->fdb_table.offloads.fwd_fdb,
+	i++;
+
+	misc = MLX5_ADDR_OF(fte_match_param, spec->match_value, misc_parameters);
+	MLX5_SET(fte_match_set_misc, misc, source_port, attr->in_rep->vport);
+
+	if (MLX5_CAP_ESW(esw->dev, merged_eswitch))
+		MLX5_SET(fte_match_set_misc, misc,
+			 source_eswitch_owner_vhca_id,
+			 MLX5_CAP_GEN(attr->in_mdev, vhca_id));
+
+	misc = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, misc_parameters);
+	MLX5_SET_TO_ONES(fte_match_set_misc, misc, source_port);
+	if (MLX5_CAP_ESW(esw->dev, merged_eswitch))
+		MLX5_SET_TO_ONES(fte_match_set_misc, misc,
+				 source_eswitch_owner_vhca_id);
+
+	if (attr->match_level == MLX5_MATCH_NONE)
+		spec->match_criteria_enable = MLX5_MATCH_MISC_PARAMETERS;
+	else
+		spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS |
+					      MLX5_MATCH_MISC_PARAMETERS;
+
+	rule = mlx5_add_flow_rules(esw->fdb_table.offloads.fast_fdb, spec, &flow_act, dest, i);
+
+	if (!IS_ERR(rule))
+		esw->offloads.num_flows++;
+
+	return rule;
+}
+
 void
 mlx5_eswitch_del_offloaded_rule(struct mlx5_eswitch *esw,
 				struct mlx5_flow_handle *rule,