net/mlx5e: Add goto to tc action infra

Add parsing support by implementing struct mlx5e_tc_act
for this action.
Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/Makefile

@@ -48,7 +48,7 @@ mlx5_core-$(CONFIG_MLX5_CLS_ACT)     += en_tc.o en/rep/tc.o en/rep/neigh.o \
 					en/tc/post_act.o en/tc/int_port.o
 
 mlx5_core-$(CONFIG_MLX5_CLS_ACT)     += en/tc/act/act.o en/tc/act/drop.o en/tc/act/trap.o \
-					en/tc/act/accept.o en/tc/act/mark.o
+					en/tc/act/accept.o en/tc/act/mark.o en/tc/act/goto.o
 
 mlx5_core-$(CONFIG_MLX5_TC_CT)	     += en/tc_ct.o
 mlx5_core-$(CONFIG_MLX5_TC_SAMPLE)   += en/tc/sample.o

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.c

@@ -10,6 +10,7 @@ static struct mlx5e_tc_act *tc_acts_fdb[NUM_FLOW_ACTIONS] = {
 	&mlx5e_tc_act_accept,
 	&mlx5e_tc_act_drop,
 	&mlx5e_tc_act_trap,
+	&mlx5e_tc_act_goto,
 };
 
 /* Must be aligned with enum flow_action_id. */
@@ -17,7 +18,7 @@ static struct mlx5e_tc_act *tc_acts_nic[NUM_FLOW_ACTIONS] = {
 	&mlx5e_tc_act_accept,
 	&mlx5e_tc_act_drop,
 	NULL, /* FLOW_ACTION_TRAP, */
-	NULL, /* FLOW_ACTION_GOTO, */
+	&mlx5e_tc_act_goto,
 	NULL, /* FLOW_ACTION_REDIRECT, */
 	NULL, /* FLOW_ACTION_MIRRED, */
 	NULL, /* FLOW_ACTION_REDIRECT_INGRESS, */

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h

@@ -31,6 +31,7 @@ extern struct mlx5e_tc_act mlx5e_tc_act_drop;
 extern struct mlx5e_tc_act mlx5e_tc_act_trap;
 extern struct mlx5e_tc_act mlx5e_tc_act_accept;
 extern struct mlx5e_tc_act mlx5e_tc_act_mark;
+extern struct mlx5e_tc_act mlx5e_tc_act_goto;
 
 struct mlx5e_tc_act *
 mlx5e_tc_act_get(enum flow_action_id act_id,

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/goto.c

+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include "act.h"
+#include "en/tc_priv.h"
+#include "eswitch.h"
+
+static int
+validate_goto_chain(struct mlx5e_priv *priv,
+		    struct mlx5e_tc_flow *flow,
+		    const struct flow_action_entry *act,
+		    struct netlink_ext_ack *extack)
+{
+	bool is_esw = mlx5e_is_eswitch_flow(flow);
+	bool ft_flow = mlx5e_is_ft_flow(flow);
+	u32 dest_chain = act->chain_index;
+	struct mlx5_fs_chains *chains;
+	struct mlx5_eswitch *esw;
+	u32 reformat_and_fwd;
+	u32 max_chain;
+
+	esw = priv->mdev->priv.eswitch;
+	chains = is_esw ? esw_chains(esw) : mlx5e_nic_chains(priv);
+	max_chain = mlx5_chains_get_chain_range(chains);
+	reformat_and_fwd = is_esw ?
+			   MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_and_fwd_to_table) :
+			   MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, reformat_and_fwd_to_table);
+
+	if (ft_flow) {
+		NL_SET_ERR_MSG_MOD(extack, "Goto action is not supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (!mlx5_chains_backwards_supported(chains) &&
+	    dest_chain <= flow->attr->chain) {
+		NL_SET_ERR_MSG_MOD(extack, "Goto lower numbered chain isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (dest_chain > max_chain) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Requested destination chain is out of supported range");
+		return -EOPNOTSUPP;
+	}
+
+	if (flow->attr->action & (MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT |
+				  MLX5_FLOW_CONTEXT_ACTION_DECAP) &&
+	    !reformat_and_fwd) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Goto chain is not allowed if action has reformat or decap");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static bool
+tc_act_can_offload_goto(struct mlx5e_tc_act_parse_state *parse_state,
+			const struct flow_action_entry *act,
+			int act_index)
+{
+	struct netlink_ext_ack *extack = parse_state->extack;
+	struct mlx5e_tc_flow *flow = parse_state->flow;
+
+	if (validate_goto_chain(flow->priv, flow, act, extack))
+		return false;
+
+	return true;
+}
+
+static int
+tc_act_parse_goto(struct mlx5e_tc_act_parse_state *parse_state,
+		  const struct flow_action_entry *act,
+		  struct mlx5e_priv *priv,
+		  struct mlx5_flow_attr *attr)
+{
+	attr->action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST |
+			MLX5_FLOW_CONTEXT_ACTION_COUNT;
+	attr->dest_chain = act->chain_index;
+
+	return 0;
+}
+
+struct mlx5e_tc_act mlx5e_tc_act_goto = {
+	.can_offload = tc_act_can_offload_goto,
+	.parse_action = tc_act_parse_goto,
+};

drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h

@@ -11,6 +11,8 @@
 
 #define MLX5E_TC_MAX_SPLITS 1
 
+#define mlx5e_nic_chains(priv) ((priv)->fs.tc.chains)
+
 enum {
 	MLX5E_TC_FLOW_FLAG_INGRESS               = MLX5E_TC_FLAG_INGRESS_BIT,
 	MLX5E_TC_FLOW_FLAG_EGRESS                = MLX5E_TC_FLAG_EGRESS_BIT,
@@ -117,6 +119,8 @@ mlx5e_tc_offload_fdb_rules(struct mlx5_eswitch *esw,
 			   struct mlx5_flow_spec *spec,
 			   struct mlx5_flow_attr *attr);
 
+bool mlx5e_is_eswitch_flow(struct mlx5e_tc_flow *flow);
+bool mlx5e_is_ft_flow(struct mlx5e_tc_flow *flow);
 bool mlx5e_is_offloaded_flow(struct mlx5e_tc_flow *flow);
 
 static inline void __flow_flag_set(struct mlx5e_tc_flow *flow, unsigned long flag)

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

@@ -71,8 +71,6 @@
 #include "lag/lag.h"
 #include "lag/mp.h"
 
-#define nic_chains(priv) ((priv)->fs.tc.chains)
-
 #define MLX5E_TC_TABLE_NUM_GROUPS 4
 #define MLX5E_TC_TABLE_MAX_GROUP_SIZE BIT(18)
 
@@ -400,7 +398,7 @@ bool mlx5e_is_eswitch_flow(struct mlx5e_tc_flow *flow)
 	return flow_flag_test(flow, ESWITCH);
 }
 
-static bool mlx5e_is_ft_flow(struct mlx5e_tc_flow *flow)
+bool mlx5e_is_ft_flow(struct mlx5e_tc_flow *flow)
 {
 	return flow_flag_test(flow, FT);
 }
@@ -938,7 +936,7 @@ mlx5e_add_offloaded_nic_rule(struct mlx5e_priv *priv,
 			     struct mlx5_flow_attr *attr)
 {
 	struct mlx5_flow_context *flow_context = &spec->flow_context;
-	struct mlx5_fs_chains *nic_chains = nic_chains(priv);
+	struct mlx5_fs_chains *nic_chains = mlx5e_nic_chains(priv);
 	struct mlx5_nic_flow_attr *nic_attr = attr->nic_attr;
 	struct mlx5e_tc_table *tc = &priv->fs.tc;
 	struct mlx5_flow_destination dest[2] = {};
@@ -1092,7 +1090,7 @@ void mlx5e_del_offloaded_nic_rule(struct mlx5e_priv *priv,
 				  struct mlx5_flow_handle *rule,
 				  struct mlx5_flow_attr *attr)
 {
-	struct mlx5_fs_chains *nic_chains = nic_chains(priv);
+	struct mlx5_fs_chains *nic_chains = mlx5e_nic_chains(priv);
 
 	mlx5_del_flow_rules(rule);
 
@@ -1124,7 +1122,7 @@ static void mlx5e_tc_del_nic_flow(struct mlx5e_priv *priv,
 	mutex_lock(&priv->fs.tc.t_lock);
 	if (!mlx5e_tc_num_filters(priv, MLX5_TC_FLAG(NIC_OFFLOAD)) &&
 	    !IS_ERR_OR_NULL(tc->t)) {
-		mlx5_chains_put_table(nic_chains(priv), 0, 1, MLX5E_TC_FT_LEVEL);
+		mlx5_chains_put_table(mlx5e_nic_chains(priv), 0, 1, MLX5E_TC_FT_LEVEL);
 		priv->fs.tc.t = NULL;
 	}
 	mutex_unlock(&priv->fs.tc.t_lock);
@@ -3357,55 +3355,6 @@ add_vlan_prio_tag_rewrite_action(struct mlx5e_priv *priv,
 				       extack);
 }
 
-static int validate_goto_chain(struct mlx5e_priv *priv,
-			       struct mlx5e_tc_flow *flow,
-			       const struct flow_action_entry *act,
-			       struct netlink_ext_ack *extack)
-{
-	bool is_esw = mlx5e_is_eswitch_flow(flow);
-	bool ft_flow = mlx5e_is_ft_flow(flow);
-	u32 dest_chain = act->chain_index;
-	struct mlx5_fs_chains *chains;
-	struct mlx5_eswitch *esw;
-	u32 reformat_and_fwd;
-	u32 max_chain;
-
-	esw = priv->mdev->priv.eswitch;
-	chains = is_esw ? esw_chains(esw) : nic_chains(priv);
-	max_chain = mlx5_chains_get_chain_range(chains);
-	reformat_and_fwd = is_esw ?
-			   MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_and_fwd_to_table) :
-			   MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, reformat_and_fwd_to_table);
-
-	if (ft_flow) {
-		NL_SET_ERR_MSG_MOD(extack, "Goto action is not supported");
-		return -EOPNOTSUPP;
-	}
-
-	if (!mlx5_chains_backwards_supported(chains) &&
-	    dest_chain <= flow->attr->chain) {
-		NL_SET_ERR_MSG_MOD(extack,
-				   "Goto lower numbered chain isn't supported");
-		return -EOPNOTSUPP;
-	}
-
-	if (dest_chain > max_chain) {
-		NL_SET_ERR_MSG_MOD(extack,
-				   "Requested destination chain is out of supported range");
-		return -EOPNOTSUPP;
-	}
-
-	if (flow->attr->action & (MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT |
-				  MLX5_FLOW_CONTEXT_ACTION_DECAP) &&
-	    !reformat_and_fwd) {
-		NL_SET_ERR_MSG_MOD(extack,
-				   "Goto chain is not allowed if action has reformat or decap");
-		return -EOPNOTSUPP;
-	}
-
-	return 0;
-}
-
 static int
 actions_prepare_mod_hdr_actions(struct mlx5e_priv *priv,
 				struct mlx5e_tc_flow *flow,
@@ -3533,15 +3482,6 @@ parse_tc_nic_actions(struct mlx5e_priv *priv,
 			}
 			}
 			break;
-		case FLOW_ACTION_GOTO:
-			err = validate_goto_chain(priv, flow, act, extack);
-			if (err)
-				return err;
-
-			attr->action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST |
-					MLX5_FLOW_CONTEXT_ACTION_COUNT;
-			attr->dest_chain = act->chain_index;
-			break;
 		case FLOW_ACTION_CT:
 			err = mlx5_tc_ct_parse_action(get_ct_priv(priv), attr,
 						      &parse_attr->mod_hdr_acts,
@@ -4184,15 +4124,6 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 		case FLOW_ACTION_TUNNEL_DECAP:
 			decap = true;
 			break;
-		case FLOW_ACTION_GOTO:
-			err = validate_goto_chain(priv, flow, act, extack);
-			if (err)
-				return err;
-
-			attr->action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST |
-					MLX5_FLOW_CONTEXT_ACTION_COUNT;
-			attr->dest_chain = act->chain_index;
-			break;
 		case FLOW_ACTION_CT:
 			if (flow_flag_test(flow, SAMPLE)) {
 				NL_SET_ERR_MSG_MOD(extack, "Sample action with connection tracking is not supported");

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

@@ -151,7 +151,6 @@ enum {
 
 int mlx5e_tc_esw_init(struct rhashtable *tc_ht);
 void mlx5e_tc_esw_cleanup(struct rhashtable *tc_ht);
-bool mlx5e_is_eswitch_flow(struct mlx5e_tc_flow *flow);
 
 int mlx5e_configure_flower(struct net_device *dev, struct mlx5e_priv *priv,
 			   struct flow_cls_offload *f, unsigned long flags);