net/mlx5: DR, Add support for dumping steering info

Extend mlx5 debugfs support to present Software Steering resources:
dr_domain including it's tables, matchers and rules.
The interface is read-only. While dump is being presented, new steering
rules cannot be inserted/deleted.

The steering information is dumped in the CSV form with the following
format:

    <object_type>,<object_ID>, <object_info>,...,<object_info>

This data can be read at the following path:

    /sys/kernel/debug/mlx5/<BDF>/steering/fdb/<domain_handle>

Example:

    # cat /sys/kernel/debug/mlx5/0000:82:00.0/steering/fdb/dmn_000018644
    3100,0x55caa4621c50,0xee802,4,65533
    3101,0x55caa4621c50,0xe0100008

Changes in V2:
 - Reduce temp hex buffer size and avoid unnecessary memset
 - Use bin2hex() instead of DIY loop
 - Don't check debugfs functions return values
Signed-off-by: Muhammad Sammar <muhammads@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>

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

@@ -104,7 +104,8 @@ mlx5_core-$(CONFIG_MLX5_SW_STEERING) += steering/dr_domain.o steering/dr_table.o
 					steering/dr_ste.o steering/dr_send.o \
 					steering/dr_ste_v0.o steering/dr_ste_v1.o \
 					steering/dr_cmd.o steering/dr_fw.o \
-					steering/dr_action.o steering/fs_dr.o
+					steering/dr_action.o steering/fs_dr.o \
+					steering/dr_dbg.o
 #
 # SF device
 #

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.c

+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include <linux/debugfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include "dr_types.h"
+
+#define DR_DBG_PTR_TO_ID(p) ((u64)(uintptr_t)(p) & 0xFFFFFFFFULL)
+
+enum dr_dump_rec_type {
+	DR_DUMP_REC_TYPE_DOMAIN = 3000,
+	DR_DUMP_REC_TYPE_DOMAIN_INFO_FLEX_PARSER = 3001,
+	DR_DUMP_REC_TYPE_DOMAIN_INFO_DEV_ATTR = 3002,
+	DR_DUMP_REC_TYPE_DOMAIN_INFO_VPORT = 3003,
+	DR_DUMP_REC_TYPE_DOMAIN_INFO_CAPS = 3004,
+	DR_DUMP_REC_TYPE_DOMAIN_SEND_RING = 3005,
+
+	DR_DUMP_REC_TYPE_TABLE = 3100,
+	DR_DUMP_REC_TYPE_TABLE_RX = 3101,
+	DR_DUMP_REC_TYPE_TABLE_TX = 3102,
+
+	DR_DUMP_REC_TYPE_MATCHER = 3200,
+	DR_DUMP_REC_TYPE_MATCHER_MASK = 3201,
+	DR_DUMP_REC_TYPE_MATCHER_RX = 3202,
+	DR_DUMP_REC_TYPE_MATCHER_TX = 3203,
+	DR_DUMP_REC_TYPE_MATCHER_BUILDER = 3204,
+
+	DR_DUMP_REC_TYPE_RULE = 3300,
+	DR_DUMP_REC_TYPE_RULE_RX_ENTRY_V0 = 3301,
+	DR_DUMP_REC_TYPE_RULE_TX_ENTRY_V0 = 3302,
+	DR_DUMP_REC_TYPE_RULE_RX_ENTRY_V1 = 3303,
+	DR_DUMP_REC_TYPE_RULE_TX_ENTRY_V1 = 3304,
+
+	DR_DUMP_REC_TYPE_ACTION_ENCAP_L2 = 3400,
+	DR_DUMP_REC_TYPE_ACTION_ENCAP_L3 = 3401,
+	DR_DUMP_REC_TYPE_ACTION_MODIFY_HDR = 3402,
+	DR_DUMP_REC_TYPE_ACTION_DROP = 3403,
+	DR_DUMP_REC_TYPE_ACTION_QP = 3404,
+	DR_DUMP_REC_TYPE_ACTION_FT = 3405,
+	DR_DUMP_REC_TYPE_ACTION_CTR = 3406,
+	DR_DUMP_REC_TYPE_ACTION_TAG = 3407,
+	DR_DUMP_REC_TYPE_ACTION_VPORT = 3408,
+	DR_DUMP_REC_TYPE_ACTION_DECAP_L2 = 3409,
+	DR_DUMP_REC_TYPE_ACTION_DECAP_L3 = 3410,
+	DR_DUMP_REC_TYPE_ACTION_DEVX_TIR = 3411,
+	DR_DUMP_REC_TYPE_ACTION_PUSH_VLAN = 3412,
+	DR_DUMP_REC_TYPE_ACTION_POP_VLAN = 3413,
+	DR_DUMP_REC_TYPE_ACTION_SAMPLER = 3415,
+	DR_DUMP_REC_TYPE_ACTION_INSERT_HDR = 3420,
+	DR_DUMP_REC_TYPE_ACTION_REMOVE_HDR = 3421
+};
+
+void mlx5dr_dbg_tbl_add(struct mlx5dr_table *tbl)
+{
+	mutex_lock(&tbl->dmn->dump_info.dbg_mutex);
+	list_add_tail(&tbl->dbg_node, &tbl->dmn->dbg_tbl_list);
+	mutex_unlock(&tbl->dmn->dump_info.dbg_mutex);
+}
+
+void mlx5dr_dbg_tbl_del(struct mlx5dr_table *tbl)
+{
+	mutex_lock(&tbl->dmn->dump_info.dbg_mutex);
+	list_del(&tbl->dbg_node);
+	mutex_unlock(&tbl->dmn->dump_info.dbg_mutex);
+}
+
+void mlx5dr_dbg_rule_add(struct mlx5dr_rule *rule)
+{
+	struct mlx5dr_domain *dmn = rule->matcher->tbl->dmn;
+
+	mutex_lock(&dmn->dump_info.dbg_mutex);
+	list_add_tail(&rule->dbg_node, &rule->matcher->dbg_rule_list);
+	mutex_unlock(&dmn->dump_info.dbg_mutex);
+}
+
+void mlx5dr_dbg_rule_del(struct mlx5dr_rule *rule)
+{
+	struct mlx5dr_domain *dmn = rule->matcher->tbl->dmn;
+
+	mutex_lock(&dmn->dump_info.dbg_mutex);
+	list_del(&rule->dbg_node);
+	mutex_unlock(&dmn->dump_info.dbg_mutex);
+}
+
+static u64 dr_dump_icm_to_idx(u64 icm_addr)
+{
+	return (icm_addr >> 6) & 0xffffffff;
+}
+
+#define DR_HEX_SIZE 256
+
+static void
+dr_dump_hex_print(char hex[DR_HEX_SIZE], char *src, u32 size)
+{
+	if (WARN_ON_ONCE(DR_HEX_SIZE < 2 * size + 1))
+		size = DR_HEX_SIZE / 2 - 1; /* truncate */
+
+	bin2hex(hex, src, size);
+	hex[2 * size] = 0; /* NULL-terminate */
+}
+
+static int
+dr_dump_rule_action_mem(struct seq_file *file, const u64 rule_id,
+			struct mlx5dr_rule_action_member *action_mem)
+{
+	struct mlx5dr_action *action = action_mem->action;
+	const u64 action_id = DR_DBG_PTR_TO_ID(action);
+
+	switch (action->action_type) {
+	case DR_ACTION_TYP_DROP:
+		seq_printf(file, "%d,0x%llx,0x%llx\n",
+			   DR_DUMP_REC_TYPE_ACTION_DROP, action_id, rule_id);
+		break;
+	case DR_ACTION_TYP_FT:
+		if (action->dest_tbl->is_fw_tbl)
+			seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+				   DR_DUMP_REC_TYPE_ACTION_FT, action_id,
+				   rule_id, action->dest_tbl->fw_tbl.id);
+		else
+			seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+				   DR_DUMP_REC_TYPE_ACTION_FT, action_id,
+				   rule_id, action->dest_tbl->tbl->table_id);
+
+		break;
+	case DR_ACTION_TYP_CTR:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_CTR, action_id, rule_id,
+			   action->ctr->ctr_id + action->ctr->offset);
+		break;
+	case DR_ACTION_TYP_TAG:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_TAG, action_id, rule_id,
+			   action->flow_tag->flow_tag);
+		break;
+	case DR_ACTION_TYP_MODIFY_HDR:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_MODIFY_HDR, action_id,
+			   rule_id, action->rewrite->index);
+		break;
+	case DR_ACTION_TYP_VPORT:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_VPORT, action_id, rule_id,
+			   action->vport->caps->num);
+		break;
+	case DR_ACTION_TYP_TNL_L2_TO_L2:
+		seq_printf(file, "%d,0x%llx,0x%llx\n",
+			   DR_DUMP_REC_TYPE_ACTION_DECAP_L2, action_id,
+			   rule_id);
+		break;
+	case DR_ACTION_TYP_TNL_L3_TO_L2:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_DECAP_L3, action_id,
+			   rule_id, action->rewrite->index);
+		break;
+	case DR_ACTION_TYP_L2_TO_TNL_L2:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_ENCAP_L2, action_id,
+			   rule_id, action->reformat->id);
+		break;
+	case DR_ACTION_TYP_L2_TO_TNL_L3:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_ENCAP_L3, action_id,
+			   rule_id, action->reformat->id);
+		break;
+	case DR_ACTION_TYP_POP_VLAN:
+		seq_printf(file, "%d,0x%llx,0x%llx\n",
+			   DR_DUMP_REC_TYPE_ACTION_POP_VLAN, action_id,
+			   rule_id);
+		break;
+	case DR_ACTION_TYP_PUSH_VLAN:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_PUSH_VLAN, action_id,
+			   rule_id, action->push_vlan->vlan_hdr);
+		break;
+	case DR_ACTION_TYP_INSERT_HDR:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x,0x%x,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_INSERT_HDR, action_id,
+			   rule_id, action->reformat->id,
+			   action->reformat->param_0,
+			   action->reformat->param_1);
+		break;
+	case DR_ACTION_TYP_REMOVE_HDR:
+		seq_printf(file, "%d,0x%llx,0x%llx,0x%x,0x%x,0x%x\n",
+			   DR_DUMP_REC_TYPE_ACTION_REMOVE_HDR, action_id,
+			   rule_id, action->reformat->id,
+			   action->reformat->param_0,
+			   action->reformat->param_1);
+		break;
+	case DR_ACTION_TYP_SAMPLER:
+		seq_printf(file,
+			   "%d,0x%llx,0x%llx,0x%x,0x%x,0x%x,0x%llx,0x%llx\n",
+			   DR_DUMP_REC_TYPE_ACTION_SAMPLER, action_id, rule_id,
+			   0, 0, action->sampler->sampler_id,
+			   action->sampler->rx_icm_addr,
+			   action->sampler->tx_icm_addr);
+		break;
+	default:
+		return 0;
+	}
+
+	return 0;
+}
+
+static int
+dr_dump_rule_mem(struct seq_file *file, struct mlx5dr_ste *ste,
+		 bool is_rx, const u64 rule_id, u8 format_ver)
+{
+	char hw_ste_dump[DR_HEX_SIZE];
+	u32 mem_rec_type;
+
+	if (format_ver == MLX5_STEERING_FORMAT_CONNECTX_5) {
+		mem_rec_type = is_rx ? DR_DUMP_REC_TYPE_RULE_RX_ENTRY_V0 :
+				       DR_DUMP_REC_TYPE_RULE_TX_ENTRY_V0;
+	} else {
+		mem_rec_type = is_rx ? DR_DUMP_REC_TYPE_RULE_RX_ENTRY_V1 :
+				       DR_DUMP_REC_TYPE_RULE_TX_ENTRY_V1;
+	}
+
+	dr_dump_hex_print(hw_ste_dump, (char *)ste->hw_ste, DR_STE_SIZE_REDUCED);
+
+	seq_printf(file, "%d,0x%llx,0x%llx,%s\n", mem_rec_type,
+		   dr_dump_icm_to_idx(mlx5dr_ste_get_icm_addr(ste)), rule_id,
+		   hw_ste_dump);
+
+	return 0;
+}
+
+static int
+dr_dump_rule_rx_tx(struct seq_file *file, struct mlx5dr_rule_rx_tx *rule_rx_tx,
+		   bool is_rx, const u64 rule_id, u8 format_ver)
+{
+	struct mlx5dr_ste *ste_arr[DR_RULE_MAX_STES + DR_ACTION_MAX_STES];
+	struct mlx5dr_ste *curr_ste = rule_rx_tx->last_rule_ste;
+	int ret, i;
+
+	if (mlx5dr_rule_get_reverse_rule_members(ste_arr, curr_ste, &i))
+		return 0;
+
+	while (i--) {
+		ret = dr_dump_rule_mem(file, ste_arr[i], is_rx, rule_id,
+				       format_ver);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int dr_dump_rule(struct seq_file *file, struct mlx5dr_rule *rule)
+{
+	struct mlx5dr_rule_action_member *action_mem;
+	const u64 rule_id = DR_DBG_PTR_TO_ID(rule);
+	struct mlx5dr_rule_rx_tx *rx = &rule->rx;
+	struct mlx5dr_rule_rx_tx *tx = &rule->tx;
+	u8 format_ver;
+	int ret;
+
+	format_ver = rule->matcher->tbl->dmn->info.caps.sw_format_ver;
+
+	seq_printf(file, "%d,0x%llx,0x%llx\n", DR_DUMP_REC_TYPE_RULE, rule_id,
+		   DR_DBG_PTR_TO_ID(rule->matcher));
+
+	if (rx->nic_matcher) {
+		ret = dr_dump_rule_rx_tx(file, rx, true, rule_id, format_ver);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (tx->nic_matcher) {
+		ret = dr_dump_rule_rx_tx(file, tx, false, rule_id, format_ver);
+		if (ret < 0)
+			return ret;
+	}
+
+	list_for_each_entry(action_mem, &rule->rule_actions_list, list) {
+		ret = dr_dump_rule_action_mem(file, rule_id, action_mem);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int
+dr_dump_matcher_mask(struct seq_file *file, struct mlx5dr_match_param *mask,
+		     u8 criteria, const u64 matcher_id)
+{
+	char dump[DR_HEX_SIZE];
+
+	seq_printf(file, "%d,0x%llx,", DR_DUMP_REC_TYPE_MATCHER_MASK,
+		   matcher_id);
+
+	if (criteria & DR_MATCHER_CRITERIA_OUTER) {
+		dr_dump_hex_print(dump, (char *)&mask->outer, sizeof(mask->outer));
+		seq_printf(file, "%s,", dump);
+	} else {
+		seq_puts(file, ",");
+	}
+
+	if (criteria & DR_MATCHER_CRITERIA_INNER) {
+		dr_dump_hex_print(dump, (char *)&mask->inner, sizeof(mask->inner));
+		seq_printf(file, "%s,", dump);
+	} else {
+		seq_puts(file, ",");
+	}
+
+	if (criteria & DR_MATCHER_CRITERIA_MISC) {
+		dr_dump_hex_print(dump, (char *)&mask->misc, sizeof(mask->misc));
+		seq_printf(file, "%s,", dump);
+	} else {
+		seq_puts(file, ",");
+	}
+
+	if (criteria & DR_MATCHER_CRITERIA_MISC2) {
+		dr_dump_hex_print(dump, (char *)&mask->misc2, sizeof(mask->misc2));
+		seq_printf(file, "%s,", dump);
+	} else {
+		seq_puts(file, ",");
+	}
+
+	if (criteria & DR_MATCHER_CRITERIA_MISC3) {
+		dr_dump_hex_print(dump, (char *)&mask->misc3, sizeof(mask->misc3));
+		seq_printf(file, "%s\n", dump);
+	} else {
+		seq_puts(file, ",\n");
+	}
+
+	return 0;
+}
+
+static int
+dr_dump_matcher_builder(struct seq_file *file, struct mlx5dr_ste_build *builder,
+			u32 index, bool is_rx, const u64 matcher_id)
+{
+	seq_printf(file, "%d,0x%llx,%d,%d,0x%x\n",
+		   DR_DUMP_REC_TYPE_MATCHER_BUILDER, matcher_id, index, is_rx,
+		   builder->lu_type);
+
+	return 0;
+}
+
+static int
+dr_dump_matcher_rx_tx(struct seq_file *file, bool is_rx,
+		      struct mlx5dr_matcher_rx_tx *matcher_rx_tx,
+		      const u64 matcher_id)
+{
+	enum dr_dump_rec_type rec_type;
+	int i, ret;
+
+	rec_type = is_rx ? DR_DUMP_REC_TYPE_MATCHER_RX :
+			   DR_DUMP_REC_TYPE_MATCHER_TX;
+
+	seq_printf(file, "%d,0x%llx,0x%llx,%d,0x%llx,0x%llx\n",
+		   rec_type, DR_DBG_PTR_TO_ID(matcher_rx_tx),
+		   matcher_id, matcher_rx_tx->num_of_builders,
+		   dr_dump_icm_to_idx(matcher_rx_tx->s_htbl->chunk->icm_addr),
+		   dr_dump_icm_to_idx(matcher_rx_tx->e_anchor->chunk->icm_addr));
+
+	for (i = 0; i < matcher_rx_tx->num_of_builders; i++) {
+		ret = dr_dump_matcher_builder(file,
+					      &matcher_rx_tx->ste_builder[i],
+					      i, is_rx, matcher_id);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int
+dr_dump_matcher(struct seq_file *file, struct mlx5dr_matcher *matcher)
+{
+	struct mlx5dr_matcher_rx_tx *rx = &matcher->rx;
+	struct mlx5dr_matcher_rx_tx *tx = &matcher->tx;
+	u64 matcher_id;
+	int ret;
+
+	matcher_id = DR_DBG_PTR_TO_ID(matcher);
+
+	seq_printf(file, "%d,0x%llx,0x%llx,%d\n", DR_DUMP_REC_TYPE_MATCHER,
+		   matcher_id, DR_DBG_PTR_TO_ID(matcher->tbl), matcher->prio);
+
+	ret = dr_dump_matcher_mask(file, &matcher->mask,
+				   matcher->match_criteria, matcher_id);
+	if (ret < 0)
+		return ret;
+
+	if (rx->nic_tbl) {
+		ret = dr_dump_matcher_rx_tx(file, true, rx, matcher_id);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (tx->nic_tbl) {
+		ret = dr_dump_matcher_rx_tx(file, false, tx, matcher_id);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int
+dr_dump_matcher_all(struct seq_file *file, struct mlx5dr_matcher *matcher)
+{
+	struct mlx5dr_rule *rule;
+	int ret;
+
+	ret = dr_dump_matcher(file, matcher);
+	if (ret < 0)
+		return ret;
+
+	list_for_each_entry(rule, &matcher->dbg_rule_list, dbg_node) {
+		ret = dr_dump_rule(file, rule);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int
+dr_dump_table_rx_tx(struct seq_file *file, bool is_rx,
+		    struct mlx5dr_table_rx_tx *table_rx_tx,
+		    const u64 table_id)
+{
+	enum dr_dump_rec_type rec_type;
+
+	rec_type = is_rx ? DR_DUMP_REC_TYPE_TABLE_RX :
+			   DR_DUMP_REC_TYPE_TABLE_TX;
+
+	seq_printf(file, "%d,0x%llx,0x%llx\n", rec_type, table_id,
+		   dr_dump_icm_to_idx(table_rx_tx->s_anchor->chunk->icm_addr));
+
+	return 0;
+}
+
+static int dr_dump_table(struct seq_file *file, struct mlx5dr_table *table)
+{
+	struct mlx5dr_table_rx_tx *rx = &table->rx;
+	struct mlx5dr_table_rx_tx *tx = &table->tx;
+	int ret;
+
+	seq_printf(file, "%d,0x%llx,0x%llx,%d,%d\n", DR_DUMP_REC_TYPE_TABLE,
+		   DR_DBG_PTR_TO_ID(table), DR_DBG_PTR_TO_ID(table->dmn),
+		   table->table_type, table->level);
+
+	if (rx->nic_dmn) {
+		ret = dr_dump_table_rx_tx(file, true, rx,
+					  DR_DBG_PTR_TO_ID(table));
+		if (ret < 0)
+			return ret;
+	}
+
+	if (tx->nic_dmn) {
+		ret = dr_dump_table_rx_tx(file, false, tx,
+					  DR_DBG_PTR_TO_ID(table));
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+static int dr_dump_table_all(struct seq_file *file, struct mlx5dr_table *tbl)
+{
+	struct mlx5dr_matcher *matcher;
+	int ret;
+
+	ret = dr_dump_table(file, tbl);
+	if (ret < 0)
+		return ret;
+
+	list_for_each_entry(matcher, &tbl->matcher_list, list_node) {
+		ret = dr_dump_matcher_all(file, matcher);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+static int
+dr_dump_send_ring(struct seq_file *file, struct mlx5dr_send_ring *ring,
+		  const u64 domain_id)
+{
+	seq_printf(file, "%d,0x%llx,0x%llx,0x%x,0x%x\n",
+		   DR_DUMP_REC_TYPE_DOMAIN_SEND_RING, DR_DBG_PTR_TO_ID(ring),
+		   domain_id, ring->cq->mcq.cqn, ring->qp->qpn);
+	return 0;
+}
+
+static int
+dr_dump_domain_info_flex_parser(struct seq_file *file,
+				const char *flex_parser_name,
+				const u8 flex_parser_value,
+				const u64 domain_id)
+{
+	seq_printf(file, "%d,0x%llx,%s,0x%x\n",
+		   DR_DUMP_REC_TYPE_DOMAIN_INFO_FLEX_PARSER, domain_id,
+		   flex_parser_name, flex_parser_value);
+	return 0;
+}
+
+static int
+dr_dump_domain_info_caps(struct seq_file *file, struct mlx5dr_cmd_caps *caps,
+			 const u64 domain_id)
+{
+	struct mlx5dr_cmd_vport_cap *vport_caps;
+	unsigned long i, vports_num;
+
+	xa_for_each(&caps->vports.vports_caps_xa, vports_num, vport_caps)
+		; /* count the number of vports in xarray */
+
+	seq_printf(file, "%d,0x%llx,0x%x,0x%llx,0x%llx,0x%x,%lu,%d\n",
+		   DR_DUMP_REC_TYPE_DOMAIN_INFO_CAPS, domain_id, caps->gvmi,
+		   caps->nic_rx_drop_address, caps->nic_tx_drop_address,
+		   caps->flex_protocols, vports_num, caps->eswitch_manager);
+
+	xa_for_each(&caps->vports.vports_caps_xa, i, vport_caps) {
+		vport_caps = xa_load(&caps->vports.vports_caps_xa, i);
+
+		seq_printf(file, "%d,0x%llx,%lu,0x%x,0x%llx,0x%llx\n",
+			   DR_DUMP_REC_TYPE_DOMAIN_INFO_VPORT, domain_id, i,
+			   vport_caps->vport_gvmi, vport_caps->icm_address_rx,
+			   vport_caps->icm_address_tx);
+	}
+	return 0;
+}
+
+static int
+dr_dump_domain_info(struct seq_file *file, struct mlx5dr_domain_info *info,
+		    const u64 domain_id)
+{
+	int ret;
+
+	ret = dr_dump_domain_info_caps(file, &info->caps, domain_id);
+	if (ret < 0)
+		return ret;
+
+	ret = dr_dump_domain_info_flex_parser(file, "icmp_dw0",
+					      info->caps.flex_parser_id_icmp_dw0,
+					      domain_id);
+	if (ret < 0)
+		return ret;
+
+	ret = dr_dump_domain_info_flex_parser(file, "icmp_dw1",
+					      info->caps.flex_parser_id_icmp_dw1,
+					      domain_id);
+	if (ret < 0)
+		return ret;
+
+	ret = dr_dump_domain_info_flex_parser(file, "icmpv6_dw0",
+					      info->caps.flex_parser_id_icmpv6_dw0,
+					      domain_id);
+	if (ret < 0)
+		return ret;
+
+	ret = dr_dump_domain_info_flex_parser(file, "icmpv6_dw1",
+					      info->caps.flex_parser_id_icmpv6_dw1,
+					      domain_id);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int
+dr_dump_domain(struct seq_file *file, struct mlx5dr_domain *dmn)
+{
+	u64 domain_id = DR_DBG_PTR_TO_ID(dmn);
+	int ret;
+
+	seq_printf(file, "%d,0x%llx,%d,0%x,%d,%s\n", DR_DUMP_REC_TYPE_DOMAIN,
+		   domain_id, dmn->type, dmn->info.caps.gvmi,
+		   dmn->info.supp_sw_steering, pci_name(dmn->mdev->pdev));
+
+	ret = dr_dump_domain_info(file, &dmn->info, domain_id);
+	if (ret < 0)
+		return ret;
+
+	if (dmn->info.supp_sw_steering) {
+		ret = dr_dump_send_ring(file, dmn->send_ring, domain_id);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int dr_dump_domain_all(struct seq_file *file, struct mlx5dr_domain *dmn)
+{
+	struct mlx5dr_table *tbl;
+	int ret;
+
+	mutex_lock(&dmn->dump_info.dbg_mutex);
+	mlx5dr_domain_lock(dmn);
+
+	ret = dr_dump_domain(file, dmn);
+	if (ret < 0)
+		goto unlock_mutex;
+
+	list_for_each_entry(tbl, &dmn->dbg_tbl_list, dbg_node) {
+		ret = dr_dump_table_all(file, tbl);
+		if (ret < 0)
+			break;
+	}
+
+unlock_mutex:
+	mlx5dr_domain_unlock(dmn);
+	mutex_unlock(&dmn->dump_info.dbg_mutex);
+	return ret;
+}
+
+static int dr_dump_show(struct seq_file *file, void *priv)
+{
+	return dr_dump_domain_all(file, file->private);
+}
+DEFINE_SHOW_ATTRIBUTE(dr_dump);
+
+void mlx5dr_dbg_init_dump(struct mlx5dr_domain *dmn)
+{
+	struct mlx5_core_dev *dev = dmn->mdev;
+	char file_name[128];
+
+	if (dmn->type != MLX5DR_DOMAIN_TYPE_FDB) {
+		mlx5_core_warn(dev,
+			       "Steering dump is not supported for NIC RX/TX domains\n");
+		return;
+	}
+
+	dmn->dump_info.steering_debugfs =
+		debugfs_create_dir("steering", dev->priv.dbg_root);
+	dmn->dump_info.fdb_debugfs =
+		debugfs_create_dir("fdb", dmn->dump_info.steering_debugfs);
+
+	sprintf(file_name, "dmn_%p", dmn);
+	debugfs_create_file(file_name, 0444, dmn->dump_info.fdb_debugfs,
+			    dmn, &dr_dump_fops);
+
+	INIT_LIST_HEAD(&dmn->dbg_tbl_list);
+	mutex_init(&dmn->dump_info.dbg_mutex);
+}
+
+void mlx5dr_dbg_uninit_dump(struct mlx5dr_domain *dmn)
+{
+	debugfs_remove_recursive(dmn->dump_info.steering_debugfs);
+	mutex_destroy(&dmn->dump_info.dbg_mutex);
+}

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_dbg.h

+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
+
+struct mlx5dr_dbg_dump_info {
+	struct mutex dbg_mutex; /* protect dbg lists */
+	struct dentry *steering_debugfs;
+	struct dentry *fdb_debugfs;
+};
+
+void mlx5dr_dbg_init_dump(struct mlx5dr_domain *dmn);
+void mlx5dr_dbg_uninit_dump(struct mlx5dr_domain *dmn);
+void mlx5dr_dbg_tbl_add(struct mlx5dr_table *tbl);
+void mlx5dr_dbg_tbl_del(struct mlx5dr_table *tbl);
+void mlx5dr_dbg_rule_add(struct mlx5dr_rule *rule);
+void mlx5dr_dbg_rule_del(struct mlx5dr_rule *rule);

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c

@@ -395,7 +395,7 @@ mlx5dr_domain_create(struct mlx5_core_dev *mdev, enum mlx5dr_domain_type type)
 	}
 
 	dr_domain_init_csum_recalc_fts(dmn);
-
+	mlx5dr_dbg_init_dump(dmn);
 	return dmn;
 
 uninit_caps:
@@ -436,6 +436,7 @@ int mlx5dr_domain_destroy(struct mlx5dr_domain *dmn)
 
 	/* make sure resources are not used by the hardware */
 	mlx5dr_cmd_sync_steering(dmn->mdev);
+	mlx5dr_dbg_uninit_dump(dmn);
 	dr_domain_uninit_csum_recalc_fts(dmn);
 	dr_domain_uninit_resources(dmn);
 	dr_domain_caps_uninit(dmn);

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_matcher.c

@@ -969,6 +969,7 @@ mlx5dr_matcher_create(struct mlx5dr_table *tbl,
 	matcher->match_criteria = match_criteria_enable;
 	refcount_set(&matcher->refcount, 1);
 	INIT_LIST_HEAD(&matcher->list_node);
+	INIT_LIST_HEAD(&matcher->dbg_rule_list);
 
 	mlx5dr_domain_lock(tbl->dmn);
 

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c

@@ -5,11 +5,6 @@
 
 #define DR_RULE_MAX_STE_CHAIN (DR_RULE_MAX_STES + DR_ACTION_MAX_STES)
 
-struct mlx5dr_rule_action_member {
-	struct mlx5dr_action *action;
-	struct list_head list;
-};
-
 static int dr_rule_append_to_miss_list(struct mlx5dr_ste_ctx *ste_ctx,
 				       struct mlx5dr_ste *new_last_ste,
 				       struct list_head *miss_list,
@@ -1003,6 +998,8 @@ static int dr_rule_destroy_rule(struct mlx5dr_rule *rule)
 {
 	struct mlx5dr_domain *dmn = rule->matcher->tbl->dmn;
 
+	mlx5dr_dbg_rule_del(rule);
+
 	switch (dmn->type) {
 	case MLX5DR_DOMAIN_TYPE_NIC_RX:
 		dr_rule_destroy_rule_nic(rule, &rule->rx);
@@ -1257,6 +1254,8 @@ dr_rule_create_rule(struct mlx5dr_matcher *matcher,
 	if (ret)
 		goto remove_action_members;
 
+	INIT_LIST_HEAD(&rule->dbg_node);
+	mlx5dr_dbg_rule_add(rule);
 	return rule;
 
 remove_action_members:

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_table.c

@@ -266,6 +266,8 @@ struct mlx5dr_table *mlx5dr_table_create(struct mlx5dr_domain *dmn, u32 level, u
 	if (ret)
 		goto uninit_tbl;
 
+	INIT_LIST_HEAD(&tbl->dbg_node);
+	mlx5dr_dbg_tbl_add(tbl);
 	return tbl;
 
 uninit_tbl:
@@ -284,6 +286,7 @@ int mlx5dr_table_destroy(struct mlx5dr_table *tbl)
 	if (refcount_read(&tbl->refcount) > 1)
 		return -EBUSY;
 
+	mlx5dr_dbg_tbl_del(tbl);
 	ret = dr_table_destroy_sw_owned_tbl(tbl);
 	if (ret)
 		return ret;

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h

@@ -11,6 +11,7 @@
 #include "lib/mlx5.h"
 #include "mlx5_ifc_dr.h"
 #include "mlx5dr.h"
+#include "dr_dbg.h"
 
 #define DR_RULE_MAX_STES 18
 #define DR_ACTION_MAX_STES 5
@@ -878,6 +879,8 @@ struct mlx5dr_domain {
 	struct mlx5dr_domain_info info;
 	struct xarray csum_fts_xa;
 	struct mlx5dr_ste_ctx *ste_ctx;
+	struct list_head dbg_tbl_list;
+	struct mlx5dr_dbg_dump_info dump_info;
 };
 
 struct mlx5dr_table_rx_tx {
@@ -897,6 +900,7 @@ struct mlx5dr_table {
 	struct list_head matcher_list;
 	struct mlx5dr_action *miss_action;
 	refcount_t refcount;
+	struct list_head dbg_node;
 };
 
 struct mlx5dr_matcher_rx_tx {
@@ -916,11 +920,12 @@ struct mlx5dr_matcher {
 	struct mlx5dr_table *tbl;
 	struct mlx5dr_matcher_rx_tx rx;
 	struct mlx5dr_matcher_rx_tx tx;
-	struct list_head list_node;
+	struct list_head list_node; /* Used for both matchers and dbg managing */
 	u32 prio;
 	struct mlx5dr_match_param mask;
 	u8 match_criteria;
 	refcount_t refcount;
+	struct list_head dbg_rule_list;
 };
 
 struct mlx5dr_ste_action_modify_field {
@@ -992,6 +997,11 @@ struct mlx5dr_action_flow_tag {
 	u32 flow_tag;
 };
 
+struct mlx5dr_rule_action_member {
+	struct mlx5dr_action *action;
+	struct list_head list;
+};
+
 struct mlx5dr_action {
 	enum mlx5dr_action_type action_type;
 	refcount_t refcount;
@@ -1032,6 +1042,7 @@ struct mlx5dr_rule {
 	struct mlx5dr_rule_rx_tx rx;
 	struct mlx5dr_rule_rx_tx tx;
 	struct list_head rule_actions_list;
+	struct list_head dbg_node;
 	u32 flow_source;
 };