net/mlx5: E-Switch, Indirect table infrastructure

Indirect table infrastructure is used to allow fully processing VF tunnel
traffic in hardware. Kernel software model uses two TC rules for such
traffic: UL rep to tunnel device, then tunnel VF rep to destination VF rep.
To implement such pipeline driver needs to program the hardware after
matching on UL rule to overwrite source vport from UL to tunnel VF and
recirculate the packet to the root table to allow matching on the rule
installed on tunnel VF. For this indirect table matches all encapsulated
traffic by tunnel parameters and all other IP traffic is sent to tunnel VF
by the miss rule.

Indirect table API overview:

- mlx5_esw_indir_table_{init|destroy}() - init and destroy opaque indirect
table object.

- mlx5_esw_indir_table_get() - get or create new table according to vport
id and IP version. Table has following pre-created groups: recirculation
group with match on ethertype and VNI (rules that match encapsulated
packets are installed to this group) and forward group with default/miss
rule that forwards to vport of tunnel endpoint VF (rule for regular
non-encapsulated packets).

- mlx5_esw_indir_table_put() - decrease reference to the indirect table and
matching rule (for encapsulated traffic).

- mlx5_esw_indir_table_needed() - check that in_port is an uplink port and
out_port is VF on the same eswitch, verify that the rule is for IP traffic
and source port rewrite functionality can be used.

- mlx5_esw_indir_table_decap_vport() - function returns decap vport of
flow attribute.

Co-developed-by: Dmytro Linkin <dlinkin@nvidia.com>
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -40,6 +40,7 @@ mlx5_core-$(CONFIG_MLX5_ESWITCH)     += lag_mp.o lib/geneve.o lib/port_tun.o \
 					en_rep.o en/rep/bond.o en/mod_hdr.o
 mlx5_core-$(CONFIG_MLX5_CLS_ACT)     += en_tc.o en/rep/tc.o en/rep/neigh.o \
 					en/mapping.o lib/fs_chains.o en/tc_tun.o \
+					esw/indir_table.o \
 					en/tc_tun_vxlan.o en/tc_tun_gre.o en/tc_tun_geneve.o \
 					en/tc_tun_mplsoudp.o diag/en_tc_tracepoint.o
 mlx5_core-$(CONFIG_MLX5_TC_CT)	     += en/tc_ct.o

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

@@ -76,6 +76,7 @@ struct mlx5_flow_attr {
 	struct mlx5_flow_table *dest_ft;
 	u8 inner_match_level;
 	u8 outer_match_level;
+	u8 ip_version;
 	u32 flags;
 	union {
 		struct mlx5_esw_flow_attr esw_attr[0];
@@ -83,6 +84,19 @@ struct mlx5_flow_attr {
 	};
 };
 
+struct mlx5_rx_tun_attr {
+	u16 decap_vport;
+	union {
+		__be32 v4;
+		struct in6_addr v6;
+	} src_ip; /* Valid if decap_vport is not zero */
+	union {
+		__be32 v4;
+		struct in6_addr v6;
+	} dst_ip; /* Valid if decap_vport is not zero */
+	u32 vni;
+};
+
 #define MLX5E_TC_TABLE_CHAIN_TAG_BITS 16
 #define MLX5E_TC_TABLE_CHAIN_TAG_MASK GENMASK(MLX5E_TC_TABLE_CHAIN_TAG_BITS - 1, 0)
 

drivers/net/ethernet/mellanox/mlx5/core/esw/indir_table.c

@@ -0,0 +1,508 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2021 Mellanox Technologies. */
+
+#include <linux/etherdevice.h>
+#include <linux/idr.h>
+#include <linux/mlx5/driver.h>
+#include <linux/mlx5/mlx5_ifc.h>
+#include <linux/mlx5/vport.h>
+#include <linux/mlx5/fs.h>
+#include "mlx5_core.h"
+#include "eswitch.h"
+#include "en.h"
+#include "en_tc.h"
+#include "fs_core.h"
+#include "esw/indir_table.h"
+#include "lib/fs_chains.h"
+
+#define MLX5_ESW_INDIR_TABLE_SIZE 128
+#define MLX5_ESW_INDIR_TABLE_RECIRC_IDX_MAX (MLX5_ESW_INDIR_TABLE_SIZE - 2)
+#define MLX5_ESW_INDIR_TABLE_FWD_IDX (MLX5_ESW_INDIR_TABLE_SIZE - 1)
+
+struct mlx5_esw_indir_table_rule {
+	struct list_head list;
+	struct mlx5_flow_handle *handle;
+	union {
+		__be32 v4;
+		struct in6_addr v6;
+	} dst_ip;
+	u32 vni;
+	struct mlx5_modify_hdr *mh;
+	refcount_t refcnt;
+};
+
+struct mlx5_esw_indir_table_entry {
+	struct hlist_node hlist;
+	struct mlx5_flow_table *ft;
+	struct mlx5_flow_group *recirc_grp;
+	struct mlx5_flow_group *fwd_grp;
+	struct mlx5_flow_handle *fwd_rule;
+	struct list_head recirc_rules;
+	int recirc_cnt;
+	int fwd_ref;
+
+	u16 vport;
+	u8 ip_version;
+};
+
+struct mlx5_esw_indir_table {
+	struct mutex lock; /* protects table */
+	DECLARE_HASHTABLE(table, 8);
+};
+
+struct mlx5_esw_indir_table *
+mlx5_esw_indir_table_init(void)
+{
+	struct mlx5_esw_indir_table *indir = kvzalloc(sizeof(*indir), GFP_KERNEL);
+
+	if (!indir)
+		return ERR_PTR(-ENOMEM);
+
+	mutex_init(&indir->lock);
+	hash_init(indir->table);
+	return indir;
+}
+
+void
+mlx5_esw_indir_table_destroy(struct mlx5_esw_indir_table *indir)
+{
+	mutex_destroy(&indir->lock);
+	kvfree(indir);
+}
+
+bool
+mlx5_esw_indir_table_needed(struct mlx5_eswitch *esw,
+			    struct mlx5_flow_attr *attr,
+			    u16 vport_num,
+			    struct mlx5_core_dev *dest_mdev)
+{
+	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
+
+	/* Use indirect table for all IP traffic from UL to VF with vport
+	 * destination when source rewrite flag is set.
+	 */
+	return esw_attr->in_rep->vport == MLX5_VPORT_UPLINK &&
+		mlx5_eswitch_is_vf_vport(esw, vport_num) &&
+		esw->dev == dest_mdev &&
+		attr->ip_version &&
+		attr->flags & MLX5_ESW_ATTR_FLAG_SRC_REWRITE;
+}
+
+u16
+mlx5_esw_indir_table_decap_vport(struct mlx5_flow_attr *attr)
+{
+	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
+
+	return esw_attr->rx_tun_attr ? esw_attr->rx_tun_attr->decap_vport : 0;
+}
+
+static struct mlx5_esw_indir_table_rule *
+mlx5_esw_indir_table_rule_lookup(struct mlx5_esw_indir_table_entry *e,
+				 struct mlx5_esw_flow_attr *attr)
+{
+	struct mlx5_esw_indir_table_rule *rule;
+
+	list_for_each_entry(rule, &e->recirc_rules, list)
+		if (rule->vni == attr->rx_tun_attr->vni &&
+		    !memcmp(&rule->dst_ip, &attr->rx_tun_attr->dst_ip,
+			    sizeof(attr->rx_tun_attr->dst_ip)))
+			goto found;
+	return NULL;
+
+found:
+	refcount_inc(&rule->refcnt);
+	return rule;
+}
+
+static int mlx5_esw_indir_table_rule_get(struct mlx5_eswitch *esw,
+					 struct mlx5_flow_attr *attr,
+					 struct mlx5_flow_spec *spec,
+					 struct mlx5_esw_indir_table_entry *e)
+{
+	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
+	struct mlx5_fs_chains *chains = esw_chains(esw);
+	struct mlx5e_tc_mod_hdr_acts mod_acts = {};
+	struct mlx5_flow_destination dest = {};
+	struct mlx5_esw_indir_table_rule *rule;
+	struct mlx5_flow_act flow_act = {};
+	struct mlx5_flow_spec *rule_spec;
+	struct mlx5_flow_handle *handle;
+	int err = 0;
+	u32 data;
+
+	rule = mlx5_esw_indir_table_rule_lookup(e, esw_attr);
+	if (rule)
+		return 0;
+
+	if (e->recirc_cnt == MLX5_ESW_INDIR_TABLE_RECIRC_IDX_MAX)
+		return -EINVAL;
+
+	rule_spec = kvzalloc(sizeof(*rule_spec), GFP_KERNEL);
+	if (!rule_spec)
+		return -ENOMEM;
+
+	rule = kzalloc(sizeof(*rule), GFP_KERNEL);
+	if (!rule) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	rule_spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS |
+					   MLX5_MATCH_MISC_PARAMETERS |
+					   MLX5_MATCH_MISC_PARAMETERS_2;
+	if (MLX5_CAP_FLOWTABLE_NIC_RX(esw->dev, ft_field_support.outer_ip_version)) {
+		MLX5_SET(fte_match_param, rule_spec->match_criteria,
+			 outer_headers.ip_version, 0xf);
+		MLX5_SET(fte_match_param, rule_spec->match_value, outer_headers.ip_version,
+			 attr->ip_version);
+	} else if (attr->ip_version) {
+		MLX5_SET_TO_ONES(fte_match_param, rule_spec->match_criteria,
+				 outer_headers.ethertype);
+		MLX5_SET(fte_match_param, rule_spec->match_value, outer_headers.ethertype,
+			 (attr->ip_version == 4 ? ETH_P_IP : ETH_P_IPV6));
+	} else {
+		err = -EOPNOTSUPP;
+		goto err_mod_hdr;
+	}
+
+	if (attr->ip_version == 4) {
+		MLX5_SET_TO_ONES(fte_match_param, rule_spec->match_criteria,
+				 outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
+		MLX5_SET(fte_match_param, rule_spec->match_value,
+			 outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4,
+			 ntohl(esw_attr->rx_tun_attr->dst_ip.v4));
+	} else if (attr->ip_version == 6) {
+		int len = sizeof(struct in6_addr);
+
+		memset(MLX5_ADDR_OF(fte_match_param, rule_spec->match_criteria,
+				    outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
+		       0xff, len);
+		memcpy(MLX5_ADDR_OF(fte_match_param, rule_spec->match_value,
+				    outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
+		       &esw_attr->rx_tun_attr->dst_ip.v6, len);
+	}
+
+	MLX5_SET_TO_ONES(fte_match_param, rule_spec->match_criteria,
+			 misc_parameters.vxlan_vni);
+	MLX5_SET(fte_match_param, rule_spec->match_value, misc_parameters.vxlan_vni,
+		 MLX5_GET(fte_match_param, spec->match_value, misc_parameters.vxlan_vni));
+
+	MLX5_SET(fte_match_param, rule_spec->match_criteria,
+		 misc_parameters_2.metadata_reg_c_0, mlx5_eswitch_get_vport_metadata_mask());
+	MLX5_SET(fte_match_param, rule_spec->match_value, misc_parameters_2.metadata_reg_c_0,
+		 mlx5_eswitch_get_vport_metadata_for_match(esw_attr->in_mdev->priv.eswitch,
+							   MLX5_VPORT_UPLINK));
+
+	/* Modify flow source to recirculate packet */
+	data = mlx5_eswitch_get_vport_metadata_for_set(esw, esw_attr->rx_tun_attr->decap_vport);
+	err = mlx5e_tc_match_to_reg_set(esw->dev, &mod_acts, MLX5_FLOW_NAMESPACE_FDB,
+					VPORT_TO_REG, data);
+	if (err)
+		goto err_mod_hdr;
+
+	flow_act.modify_hdr = mlx5_modify_header_alloc(esw->dev, MLX5_FLOW_NAMESPACE_FDB,
+						       mod_acts.num_actions, mod_acts.actions);
+	if (IS_ERR(flow_act.modify_hdr)) {
+		err = PTR_ERR(flow_act.modify_hdr);
+		goto err_mod_hdr;
+	}
+
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST | MLX5_FLOW_CONTEXT_ACTION_MOD_HDR;
+	flow_act.flags = FLOW_ACT_IGNORE_FLOW_LEVEL | FLOW_ACT_NO_APPEND;
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+	dest.ft = mlx5_chains_get_table(chains, 0, 1, 0);
+	if (!dest.ft) {
+		err = PTR_ERR(dest.ft);
+		goto err_table;
+	}
+	handle = mlx5_add_flow_rules(e->ft, rule_spec, &flow_act, &dest, 1);
+	if (IS_ERR(handle)) {
+		err = PTR_ERR(handle);
+		goto err_handle;
+	}
+
+	dealloc_mod_hdr_actions(&mod_acts);
+	rule->handle = handle;
+	rule->vni = esw_attr->rx_tun_attr->vni;
+	rule->mh = flow_act.modify_hdr;
+	memcpy(&rule->dst_ip, &esw_attr->rx_tun_attr->dst_ip,
+	       sizeof(esw_attr->rx_tun_attr->dst_ip));
+	refcount_set(&rule->refcnt, 1);
+	list_add(&rule->list, &e->recirc_rules);
+	e->recirc_cnt++;
+	goto out;
+
+err_handle:
+	mlx5_chains_put_table(chains, 0, 1, 0);
+err_table:
+	mlx5_modify_header_dealloc(esw->dev, flow_act.modify_hdr);
+err_mod_hdr:
+	kfree(rule);
+out:
+	kfree(rule_spec);
+	return err;
+}
+
+static void mlx5_esw_indir_table_rule_put(struct mlx5_eswitch *esw,
+					  struct mlx5_flow_attr *attr,
+					  struct mlx5_esw_indir_table_entry *e)
+{
+	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
+	struct mlx5_fs_chains *chains = esw_chains(esw);
+	struct mlx5_esw_indir_table_rule *rule;
+
+	list_for_each_entry(rule, &e->recirc_rules, list)
+		if (rule->vni == esw_attr->rx_tun_attr->vni &&
+		    !memcmp(&rule->dst_ip, &esw_attr->rx_tun_attr->dst_ip,
+			    sizeof(esw_attr->rx_tun_attr->dst_ip)))
+			goto found;
+
+	return;
+
+found:
+	if (!refcount_dec_and_test(&rule->refcnt))
+		return;
+
+	mlx5_del_flow_rules(rule->handle);
+	mlx5_chains_put_table(chains, 0, 1, 0);
+	mlx5_modify_header_dealloc(esw->dev, rule->mh);
+	list_del(&rule->list);
+	kfree(rule);
+	e->recirc_cnt--;
+}
+
+static int mlx5_create_indir_recirc_group(struct mlx5_eswitch *esw,
+					  struct mlx5_flow_attr *attr,
+					  struct mlx5_flow_spec *spec,
+					  struct mlx5_esw_indir_table_entry *e)
+{
+	int err = 0, inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
+	u32 *in, *match;
+
+	in = kvzalloc(inlen, GFP_KERNEL);
+	if (!in)
+		return -ENOMEM;
+
+	MLX5_SET(create_flow_group_in, in, match_criteria_enable, MLX5_MATCH_OUTER_HEADERS |
+		 MLX5_MATCH_MISC_PARAMETERS | MLX5_MATCH_MISC_PARAMETERS_2);
+	match = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
+
+	if (MLX5_CAP_FLOWTABLE_NIC_RX(esw->dev, ft_field_support.outer_ip_version))
+		MLX5_SET(fte_match_param, match, outer_headers.ip_version, 0xf);
+	else
+		MLX5_SET_TO_ONES(fte_match_param, match, outer_headers.ethertype);
+
+	if (attr->ip_version == 4) {
+		MLX5_SET_TO_ONES(fte_match_param, match,
+				 outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
+	} else if (attr->ip_version == 6) {
+		memset(MLX5_ADDR_OF(fte_match_param, match,
+				    outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
+		       0xff, sizeof(struct in6_addr));
+	} else {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	MLX5_SET_TO_ONES(fte_match_param, match, misc_parameters.vxlan_vni);
+	MLX5_SET(fte_match_param, match, misc_parameters_2.metadata_reg_c_0,
+		 mlx5_eswitch_get_vport_metadata_mask());
+	MLX5_SET(create_flow_group_in, in, start_flow_index, 0);
+	MLX5_SET(create_flow_group_in, in, end_flow_index, MLX5_ESW_INDIR_TABLE_RECIRC_IDX_MAX);
+	e->recirc_grp = mlx5_create_flow_group(e->ft, in);
+	if (IS_ERR(e->recirc_grp)) {
+		err = PTR_ERR(e->recirc_grp);
+		goto out;
+	}
+
+	INIT_LIST_HEAD(&e->recirc_rules);
+	e->recirc_cnt = 0;
+
+out:
+	kfree(in);
+	return err;
+}
+
+static int mlx5_create_indir_fwd_group(struct mlx5_eswitch *esw,
+				       struct mlx5_esw_indir_table_entry *e)
+{
+	int err = 0, inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
+	struct mlx5_flow_destination dest = {};
+	struct mlx5_flow_act flow_act = {};
+	struct mlx5_flow_spec *spec;
+	u32 *in;
+
+	in = kvzalloc(inlen, GFP_KERNEL);
+	if (!in)
+		return -ENOMEM;
+
+	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
+	if (!spec) {
+		kfree(in);
+		return -ENOMEM;
+	}
+
+	/* Hold one entry */
+	MLX5_SET(create_flow_group_in, in, start_flow_index, MLX5_ESW_INDIR_TABLE_FWD_IDX);
+	MLX5_SET(create_flow_group_in, in, end_flow_index, MLX5_ESW_INDIR_TABLE_FWD_IDX);
+	e->fwd_grp = mlx5_create_flow_group(e->ft, in);
+	if (IS_ERR(e->fwd_grp)) {
+		err = PTR_ERR(e->fwd_grp);
+		goto err_out;
+	}
+
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
+	dest.vport.num = e->vport;
+	dest.vport.vhca_id = MLX5_CAP_GEN(esw->dev, vhca_id);
+	e->fwd_rule = mlx5_add_flow_rules(e->ft, spec, &flow_act, &dest, 1);
+	if (IS_ERR(e->fwd_rule)) {
+		mlx5_destroy_flow_group(e->fwd_grp);
+		err = PTR_ERR(e->fwd_rule);
+	}
+
+err_out:
+	kfree(spec);
+	kfree(in);
+	return err;
+}
+
+static struct mlx5_esw_indir_table_entry *
+mlx5_esw_indir_table_entry_create(struct mlx5_eswitch *esw, struct mlx5_flow_attr *attr,
+				  struct mlx5_flow_spec *spec, u16 vport, bool decap)
+{
+	struct mlx5_flow_table_attr ft_attr = {};
+	struct mlx5_flow_namespace *root_ns;
+	struct mlx5_esw_indir_table_entry *e;
+	struct mlx5_flow_table *ft;
+	int err = 0;
+
+	root_ns = mlx5_get_flow_namespace(esw->dev, MLX5_FLOW_NAMESPACE_FDB);
+	if (!root_ns)
+		return ERR_PTR(-ENOENT);
+
+	e = kzalloc(sizeof(*e), GFP_KERNEL);
+	if (!e)
+		return ERR_PTR(-ENOMEM);
+
+	ft_attr.prio = FDB_TC_OFFLOAD;
+	ft_attr.max_fte = MLX5_ESW_INDIR_TABLE_SIZE;
+	ft_attr.flags = MLX5_FLOW_TABLE_UNMANAGED;
+	ft_attr.level = 1;
+
+	ft = mlx5_create_flow_table(root_ns, &ft_attr);
+	if (IS_ERR(ft)) {
+		err = PTR_ERR(ft);
+		goto tbl_err;
+	}
+	e->ft = ft;
+	e->vport = vport;
+	e->ip_version = attr->ip_version;
+	e->fwd_ref = !decap;
+
+	err = mlx5_create_indir_recirc_group(esw, attr, spec, e);
+	if (err)
+		goto recirc_grp_err;
+
+	if (decap) {
+		err = mlx5_esw_indir_table_rule_get(esw, attr, spec, e);
+		if (err)
+			goto recirc_rule_err;
+	}
+
+	err = mlx5_create_indir_fwd_group(esw, e);
+	if (err)
+		goto fwd_grp_err;
+
+	hash_add(esw->fdb_table.offloads.indir->table, &e->hlist,
+		 vport << 16 | attr->ip_version);
+
+	return e;
+
+fwd_grp_err:
+	if (decap)
+		mlx5_esw_indir_table_rule_put(esw, attr, e);
+recirc_rule_err:
+	mlx5_destroy_flow_group(e->recirc_grp);
+recirc_grp_err:
+	mlx5_destroy_flow_table(e->ft);
+tbl_err:
+	kfree(e);
+	return ERR_PTR(err);
+}
+
+static struct mlx5_esw_indir_table_entry *
+mlx5_esw_indir_table_entry_lookup(struct mlx5_eswitch *esw, u16 vport, u8 ip_version)
+{
+	struct mlx5_esw_indir_table_entry *e;
+	u32 key = vport << 16 | ip_version;
+
+	hash_for_each_possible(esw->fdb_table.offloads.indir->table, e, hlist, key)
+		if (e->vport == vport && e->ip_version == ip_version)
+			return e;
+
+	return NULL;
+}
+
+struct mlx5_flow_table *mlx5_esw_indir_table_get(struct mlx5_eswitch *esw,
+						 struct mlx5_flow_attr *attr,
+						 struct mlx5_flow_spec *spec,
+						 u16 vport, bool decap)
+{
+	struct mlx5_esw_indir_table_entry *e;
+	int err;
+
+	mutex_lock(&esw->fdb_table.offloads.indir->lock);
+	e = mlx5_esw_indir_table_entry_lookup(esw, vport, attr->ip_version);
+	if (e) {
+		if (!decap) {
+			e->fwd_ref++;
+		} else {
+			err = mlx5_esw_indir_table_rule_get(esw, attr, spec, e);
+			if (err)
+				goto out_err;
+		}
+	} else {
+		e = mlx5_esw_indir_table_entry_create(esw, attr, spec, vport, decap);
+		if (IS_ERR(e)) {
+			err = PTR_ERR(e);
+			esw_warn(esw->dev, "Failed to create indirection table, err %d.\n", err);
+			goto out_err;
+		}
+	}
+	mutex_unlock(&esw->fdb_table.offloads.indir->lock);
+	return e->ft;
+
+out_err:
+	mutex_unlock(&esw->fdb_table.offloads.indir->lock);
+	return ERR_PTR(err);
+}
+
+void mlx5_esw_indir_table_put(struct mlx5_eswitch *esw,
+			      struct mlx5_flow_attr *attr,
+			      u16 vport, bool decap)
+{
+	struct mlx5_esw_indir_table_entry *e;
+
+	mutex_lock(&esw->fdb_table.offloads.indir->lock);
+	e = mlx5_esw_indir_table_entry_lookup(esw, vport, attr->ip_version);
+	if (!e)
+		goto out;
+
+	if (!decap)
+		e->fwd_ref--;
+	else
+		mlx5_esw_indir_table_rule_put(esw, attr, e);
+
+	if (e->fwd_ref || e->recirc_cnt)
+		goto out;
+
+	hash_del(&e->hlist);
+	mlx5_destroy_flow_group(e->recirc_grp);
+	mlx5_del_flow_rules(e->fwd_rule);
+	mlx5_destroy_flow_group(e->fwd_grp);
+	mlx5_destroy_flow_table(e->ft);
+	kfree(e);
+out:
+	mutex_unlock(&esw->fdb_table.offloads.indir->lock);
+}

drivers/net/ethernet/mellanox/mlx5/core/esw/indir_table.h

@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2021 Mellanox Technologies. */
+
+#ifndef __MLX5_ESW_FT_H__
+#define __MLX5_ESW_FT_H__
+
+#ifdef CONFIG_MLX5_CLS_ACT
+
+struct mlx5_esw_indir_table *
+mlx5_esw_indir_table_init(void);
+void
+mlx5_esw_indir_table_destroy(struct mlx5_esw_indir_table *indir);
+
+struct mlx5_flow_table *mlx5_esw_indir_table_get(struct mlx5_eswitch *esw,
+						 struct mlx5_flow_attr *attr,
+						 struct mlx5_flow_spec *spec,
+						 u16 vport, bool decap);
+void mlx5_esw_indir_table_put(struct mlx5_eswitch *esw,
+			      struct mlx5_flow_attr *attr,
+			      u16 vport, bool decap);
+
+bool
+mlx5_esw_indir_table_needed(struct mlx5_eswitch *esw,
+			    struct mlx5_flow_attr *attr,
+			    u16 vport_num,
+			    struct mlx5_core_dev *dest_mdev);
+
+u16
+mlx5_esw_indir_table_decap_vport(struct mlx5_flow_attr *attr);
+
+#else
+/* indir API stubs */
+struct mlx5_esw_indir_table *
+mlx5_esw_indir_table_init(void)
+{
+	return NULL;
+}
+
+void
+mlx5_esw_indir_table_destroy(struct mlx5_esw_indir_table *indir)
+{
+}
+
+static inline struct mlx5_flow_table *
+mlx5_esw_indir_table_get(struct mlx5_eswitch *esw,
+			 struct mlx5_flow_attr *attr,
+			 struct mlx5_flow_spec *spec,
+			 u16 vport, bool decap)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+static inline void
+mlx5_esw_indir_table_put(struct mlx5_eswitch *esw,
+			 struct mlx5_flow_attr *attr,
+			 u16 vport, bool decap)
+{
+}
+
+bool
+mlx5_esw_indir_table_needed(struct mlx5_eswitch *esw,
+			    struct mlx5_flow_attr *attr,
+			    u16 vport_num,
+			    struct mlx5_core_dev *dest_mdev)
+{
+	return false;
+}
+
+static inline u16
+mlx5_esw_indir_table_decap_vport(struct mlx5_flow_attr *attr)
+{
+	return 0;
+}
+#endif
+
+#endif /* __MLX5_ESW_FT_H__ */

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

@@ -161,6 +161,8 @@ struct mlx5_vport {
 	struct devlink_port *dl_port;
 };
 
+struct mlx5_esw_indir_table;
+
 struct mlx5_eswitch_fdb {
 	union {
 		struct legacy_fdb {
@@ -191,6 +193,8 @@ struct mlx5_eswitch_fdb {
 				struct mutex lock;
 			} vports;
 
+			struct mlx5_esw_indir_table *indir;
+
 		} offloads;
 	};
 	u32 flags;
@@ -418,6 +422,7 @@ struct mlx5_esw_flow_attr {
 		struct mlx5_core_dev *mdev;
 		struct mlx5_termtbl_handle *termtbl;
 	} dests[MLX5_MAX_FLOW_FWD_VPORTS];
+	struct mlx5_rx_tun_attr *rx_tun_attr;
 	struct mlx5_pkt_reformat *decap_pkt_reformat;
 };
 

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

@@ -38,6 +38,7 @@
 #include <linux/mlx5/fs.h>
 #include "mlx5_core.h"
 #include "eswitch.h"
+#include "esw/indir_table.h"
 #include "esw/acl/ofld.h"
 #include "rdma.h"
 #include "en.h"
@@ -2342,12 +2343,20 @@ static void esw_destroy_uplink_offloads_acl_tables(struct mlx5_eswitch *esw)
 
 static int esw_offloads_steering_init(struct mlx5_eswitch *esw)
 {
+	struct mlx5_esw_indir_table *indir;
 	int err;
 
 	memset(&esw->fdb_table.offloads, 0, sizeof(struct offloads_fdb));
 	mutex_init(&esw->fdb_table.offloads.vports.lock);
 	hash_init(esw->fdb_table.offloads.vports.table);
 
+	indir = mlx5_esw_indir_table_init();
+	if (IS_ERR(indir)) {
+		err = PTR_ERR(indir);
+		goto create_indir_err;
+	}
+	esw->fdb_table.offloads.indir = indir;
+
 	err = esw_create_uplink_offloads_acl_tables(esw);
 	if (err)
 		goto create_acl_err;
@@ -2379,6 +2388,8 @@ create_restore_err:
 create_offloads_err:
 	esw_destroy_uplink_offloads_acl_tables(esw);
 create_acl_err:
+	mlx5_esw_indir_table_destroy(esw->fdb_table.offloads.indir);
+create_indir_err:
 	mutex_destroy(&esw->fdb_table.offloads.vports.lock);
 	return err;
 }
@@ -2390,6 +2401,7 @@ static void esw_offloads_steering_cleanup(struct mlx5_eswitch *esw)
 	esw_destroy_restore_table(esw);
 	esw_destroy_offloads_table(esw);
 	esw_destroy_uplink_offloads_acl_tables(esw);
+	mlx5_esw_indir_table_destroy(esw->fdb_table.offloads.indir);
 	mutex_destroy(&esw->fdb_table.offloads.vports.lock);
 }