net/mlx5e: Add vlan push/pop/mangle 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

@@ -49,7 +49,8 @@ mlx5_core-$(CONFIG_MLX5_CLS_ACT)     += en_tc.o en/rep/tc.o en/rep/neigh.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/goto.o \
-					en/tc/act/tun.o en/tc/act/csum.o en/tc/act/pedit.o
+					en/tc/act/tun.o en/tc/act/csum.o en/tc/act/pedit.o \
+					en/tc/act/vlan.o en/tc/act/vlan_mangle.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

@@ -15,9 +15,9 @@ static struct mlx5e_tc_act *tc_acts_fdb[NUM_FLOW_ACTIONS] = {
 	NULL, /* FLOW_ACTION_MIRRED, */
 	NULL, /* FLOW_ACTION_REDIRECT_INGRESS, */
 	NULL, /* FLOW_ACTION_MIRRED_INGRESS, */
-	NULL, /* FLOW_ACTION_VLAN_PUSH, */
-	NULL, /* FLOW_ACTION_VLAN_POP, */
-	NULL, /* FLOW_ACTION_VLAN_MANGLE, */
+	&mlx5e_tc_act_vlan,
+	&mlx5e_tc_act_vlan,
+	&mlx5e_tc_act_vlan_mangle,
 	&mlx5e_tc_act_tun_encap,
 	&mlx5e_tc_act_tun_decap,
 	&mlx5e_tc_act_pedit,

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

@@ -42,6 +42,8 @@ extern struct mlx5e_tc_act mlx5e_tc_act_tun_encap;
 extern struct mlx5e_tc_act mlx5e_tc_act_tun_decap;
 extern struct mlx5e_tc_act mlx5e_tc_act_csum;
 extern struct mlx5e_tc_act mlx5e_tc_act_pedit;
+extern struct mlx5e_tc_act mlx5e_tc_act_vlan;
+extern struct mlx5e_tc_act mlx5e_tc_act_vlan_mangle;
 
 struct mlx5e_tc_act *
 mlx5e_tc_act_get(enum flow_action_id act_id,

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

+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include <linux/if_vlan.h>
+#include "act.h"
+#include "vlan.h"
+#include "en/tc_priv.h"
+
+static int
+parse_tc_vlan_action(struct mlx5e_priv *priv,
+		     const struct flow_action_entry *act,
+		     struct mlx5_esw_flow_attr *attr,
+		     u32 *action,
+		     struct netlink_ext_ack *extack)
+{
+	u8 vlan_idx = attr->total_vlan;
+
+	if (vlan_idx >= MLX5_FS_VLAN_DEPTH) {
+		NL_SET_ERR_MSG_MOD(extack, "Total vlans used is greater than supported");
+		return -EOPNOTSUPP;
+	}
+
+	switch (act->id) {
+	case FLOW_ACTION_VLAN_POP:
+		if (vlan_idx) {
+			if (!mlx5_eswitch_vlan_actions_supported(priv->mdev,
+								 MLX5_FS_VLAN_DEPTH)) {
+				NL_SET_ERR_MSG_MOD(extack, "vlan pop action is not supported");
+				return -EOPNOTSUPP;
+			}
+
+			*action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_POP_2;
+		} else {
+			*action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_POP;
+		}
+		break;
+	case FLOW_ACTION_VLAN_PUSH:
+		attr->vlan_vid[vlan_idx] = act->vlan.vid;
+		attr->vlan_prio[vlan_idx] = act->vlan.prio;
+		attr->vlan_proto[vlan_idx] = act->vlan.proto;
+		if (!attr->vlan_proto[vlan_idx])
+			attr->vlan_proto[vlan_idx] = htons(ETH_P_8021Q);
+
+		if (vlan_idx) {
+			if (!mlx5_eswitch_vlan_actions_supported(priv->mdev,
+								 MLX5_FS_VLAN_DEPTH)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "vlan push action is not supported for vlan depth > 1");
+				return -EOPNOTSUPP;
+			}
+
+			*action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2;
+		} else {
+			if (!mlx5_eswitch_vlan_actions_supported(priv->mdev, 1) &&
+			    (act->vlan.proto != htons(ETH_P_8021Q) ||
+			     act->vlan.prio)) {
+				NL_SET_ERR_MSG_MOD(extack, "vlan push action is not supported");
+				return -EOPNOTSUPP;
+			}
+
+			*action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH;
+		}
+		break;
+	default:
+		NL_SET_ERR_MSG_MOD(extack, "Unexpected action id for VLAN");
+		return -EINVAL;
+	}
+
+	attr->total_vlan = vlan_idx + 1;
+
+	return 0;
+}
+
+int
+mlx5e_tc_act_vlan_add_push_action(struct mlx5e_priv *priv,
+				  struct mlx5_flow_attr *attr,
+				  struct net_device **out_dev,
+				  struct netlink_ext_ack *extack)
+{
+	struct net_device *vlan_dev = *out_dev;
+	struct flow_action_entry vlan_act = {
+		.id = FLOW_ACTION_VLAN_PUSH,
+		.vlan.vid = vlan_dev_vlan_id(vlan_dev),
+		.vlan.proto = vlan_dev_vlan_proto(vlan_dev),
+		.vlan.prio = 0,
+	};
+	int err;
+
+	err = parse_tc_vlan_action(priv, &vlan_act, attr->esw_attr, &attr->action, extack);
+	if (err)
+		return err;
+
+	rcu_read_lock();
+	*out_dev = dev_get_by_index_rcu(dev_net(vlan_dev), dev_get_iflink(vlan_dev));
+	rcu_read_unlock();
+	if (!*out_dev)
+		return -ENODEV;
+
+	if (is_vlan_dev(*out_dev))
+		err = mlx5e_tc_act_vlan_add_push_action(priv, attr, out_dev, extack);
+
+	return err;
+}
+
+int
+mlx5e_tc_act_vlan_add_pop_action(struct mlx5e_priv *priv,
+				 struct mlx5_flow_attr *attr,
+				 struct netlink_ext_ack *extack)
+{
+	struct flow_action_entry vlan_act = {
+		.id = FLOW_ACTION_VLAN_POP,
+	};
+	int nest_level, err = 0;
+
+	nest_level = attr->parse_attr->filter_dev->lower_level -
+						priv->netdev->lower_level;
+	while (nest_level--) {
+		err = parse_tc_vlan_action(priv, &vlan_act, attr->esw_attr, &attr->action,
+					   extack);
+		if (err)
+			return err;
+	}
+
+	return err;
+}
+
+static bool
+tc_act_can_offload_vlan(struct mlx5e_tc_act_parse_state *parse_state,
+			const struct flow_action_entry *act,
+			int act_index)
+{
+	return true;
+}
+
+static int
+tc_act_parse_vlan(struct mlx5e_tc_act_parse_state *parse_state,
+		  const struct flow_action_entry *act,
+		  struct mlx5e_priv *priv,
+		  struct mlx5_flow_attr *attr)
+{
+	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
+	int err;
+
+	if (act->id == FLOW_ACTION_VLAN_PUSH &&
+	    (attr->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_POP)) {
+		/* Replace vlan pop+push with vlan modify */
+		attr->action &= ~MLX5_FLOW_CONTEXT_ACTION_VLAN_POP;
+		err = mlx5e_tc_act_vlan_add_rewrite_action(priv, MLX5_FLOW_NAMESPACE_FDB, act,
+							   attr->parse_attr, parse_state->hdrs,
+							   &attr->action, parse_state->extack);
+	} else {
+		err = parse_tc_vlan_action(priv, act, esw_attr, &attr->action,
+					   parse_state->extack);
+	}
+
+	if (err)
+		return err;
+
+	esw_attr->split_count = esw_attr->out_count;
+
+	return 0;
+}
+
+struct mlx5e_tc_act mlx5e_tc_act_vlan = {
+	.can_offload = tc_act_can_offload_vlan,
+	.parse_action = tc_act_parse_vlan,
+};

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

+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
+
+#ifndef __MLX5_EN_TC_ACT_VLAN_H__
+#define __MLX5_EN_TC_ACT_VLAN_H__
+
+#include <net/flow_offload.h>
+#include "en/tc_priv.h"
+
+struct pedit_headers_action;
+
+int
+mlx5e_tc_act_vlan_add_push_action(struct mlx5e_priv *priv,
+				  struct mlx5_flow_attr *attr,
+				  struct net_device **out_dev,
+				  struct netlink_ext_ack *extack);
+
+int
+mlx5e_tc_act_vlan_add_pop_action(struct mlx5e_priv *priv,
+				 struct mlx5_flow_attr *attr,
+				 struct netlink_ext_ack *extack);
+
+int
+mlx5e_tc_act_vlan_add_rewrite_action(struct mlx5e_priv *priv, int namespace,
+				     const struct flow_action_entry *act,
+				     struct mlx5e_tc_flow_parse_attr *parse_attr,
+				     struct pedit_headers_action *hdrs,
+				     u32 *action, struct netlink_ext_ack *extack);
+
+#endif /* __MLX5_EN_TC_ACT_VLAN_H__ */

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

+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include <linux/if_vlan.h>
+#include "act.h"
+#include "vlan.h"
+#include "en/tc_priv.h"
+
+struct pedit_headers_action;
+
+int
+mlx5e_tc_act_vlan_add_rewrite_action(struct mlx5e_priv *priv, int namespace,
+				     const struct flow_action_entry *act,
+				     struct mlx5e_tc_flow_parse_attr *parse_attr,
+				     struct pedit_headers_action *hdrs,
+				     u32 *action, struct netlink_ext_ack *extack)
+{
+	u16 mask16 = VLAN_VID_MASK;
+	u16 val16 = act->vlan.vid & VLAN_VID_MASK;
+	const struct flow_action_entry pedit_act = {
+		.id = FLOW_ACTION_MANGLE,
+		.mangle.htype = FLOW_ACT_MANGLE_HDR_TYPE_ETH,
+		.mangle.offset = offsetof(struct vlan_ethhdr, h_vlan_TCI),
+		.mangle.mask = ~(u32)be16_to_cpu(*(__be16 *)&mask16),
+		.mangle.val = (u32)be16_to_cpu(*(__be16 *)&val16),
+	};
+	u8 match_prio_mask, match_prio_val;
+	void *headers_c, *headers_v;
+	int err;
+
+	headers_c = mlx5e_get_match_headers_criteria(*action, &parse_attr->spec);
+	headers_v = mlx5e_get_match_headers_value(*action, &parse_attr->spec);
+
+	if (!(MLX5_GET(fte_match_set_lyr_2_4, headers_c, cvlan_tag) &&
+	      MLX5_GET(fte_match_set_lyr_2_4, headers_v, cvlan_tag))) {
+		NL_SET_ERR_MSG_MOD(extack, "VLAN rewrite action must have VLAN protocol match");
+		return -EOPNOTSUPP;
+	}
+
+	match_prio_mask = MLX5_GET(fte_match_set_lyr_2_4, headers_c, first_prio);
+	match_prio_val = MLX5_GET(fte_match_set_lyr_2_4, headers_v, first_prio);
+	if (act->vlan.prio != (match_prio_val & match_prio_mask)) {
+		NL_SET_ERR_MSG_MOD(extack, "Changing VLAN prio is not supported");
+		return -EOPNOTSUPP;
+	}
+
+	err = mlx5e_tc_act_pedit_parse_action(priv, &pedit_act, namespace, parse_attr, hdrs,
+					      NULL, extack);
+	*action |= MLX5_FLOW_CONTEXT_ACTION_MOD_HDR;
+
+	return err;
+}
+
+static bool
+tc_act_can_offload_vlan_mangle(struct mlx5e_tc_act_parse_state *parse_state,
+			       const struct flow_action_entry *act,
+			       int act_index)
+{
+	return true;
+}
+
+static int
+tc_act_parse_vlan_mangle(struct mlx5e_tc_act_parse_state *parse_state,
+			 const struct flow_action_entry *act,
+			 struct mlx5e_priv *priv,
+			 struct mlx5_flow_attr *attr)
+{
+	enum mlx5_flow_namespace_type ns_type;
+	int err;
+
+	ns_type = mlx5e_get_flow_namespace(parse_state->flow);
+	err = mlx5e_tc_act_vlan_add_rewrite_action(priv, ns_type, act,
+						   attr->parse_attr, parse_state->hdrs,
+						   &attr->action, parse_state->extack);
+	if (err)
+		return err;
+
+	if (ns_type == MLX5_FLOW_NAMESPACE_FDB)
+		attr->esw_attr->split_count = attr->esw_attr->out_count;
+
+	return 0;
+}
+
+struct mlx5e_tc_act mlx5e_tc_act_vlan_mangle = {
+	.can_offload = tc_act_can_offload_vlan_mangle,
+	.parse_action = tc_act_parse_vlan_mangle,
+};

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

@@ -183,4 +183,8 @@ struct mlx5_fc *mlx5e_tc_get_counter(struct mlx5e_tc_flow *flow);
 
 struct mlx5e_tc_int_port_priv *
 mlx5e_get_int_port_priv(struct mlx5e_priv *priv);
+
+void *mlx5e_get_match_headers_value(u32 flags, struct mlx5_flow_spec *spec);
+void *mlx5e_get_match_headers_criteria(u32 flags, struct mlx5_flow_spec *spec);
+
 #endif /* __MLX5_EN_TC_PRIV_H__ */