diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index a22c32aabf11..cd4a1ab0ea78 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -111,6 +111,7 @@ mlx5_core-$(CONFIG_MLX5_SW_STEERING) += steering/dr_domain.o steering/dr_table.o
 					steering/dr_ste_v2.o \
 					steering/dr_cmd.o steering/dr_fw.o \
 					steering/dr_action.o steering/fs_dr.o \
+					steering/dr_definer.o \
 					steering/dr_dbg.o lib/smfs.o
 #
 # SF device
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_definer.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_definer.c
new file mode 100644
index 000000000000..d5ea97751945
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_definer.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include "dr_types.h"
+#include "dr_ste.h"
+
+struct dr_definer_object {
+	u32 id;
+	u16 format_id;
+	u8 dw_selectors[MLX5_IFC_DEFINER_DW_SELECTORS_NUM];
+	u8 byte_selectors[MLX5_IFC_DEFINER_BYTE_SELECTORS_NUM];
+	u8 match_mask[DR_STE_SIZE_MATCH_TAG];
+	refcount_t refcount;
+};
+
+static bool dr_definer_compare(struct dr_definer_object *definer,
+			       u16 format_id, u8 *dw_selectors,
+			       u8 *byte_selectors, u8 *match_mask)
+{
+	int i;
+
+	if (definer->format_id != format_id)
+		return false;
+
+	for (i = 0; i < MLX5_IFC_DEFINER_DW_SELECTORS_NUM; i++)
+		if (definer->dw_selectors[i] != dw_selectors[i])
+			return false;
+
+	for (i = 0; i < MLX5_IFC_DEFINER_BYTE_SELECTORS_NUM; i++)
+		if (definer->byte_selectors[i] != byte_selectors[i])
+			return false;
+
+	if (memcmp(definer->match_mask, match_mask, DR_STE_SIZE_MATCH_TAG))
+		return false;
+
+	return true;
+}
+
+static struct dr_definer_object *
+dr_definer_find_obj(struct mlx5dr_domain *dmn, u16 format_id,
+		    u8 *dw_selectors, u8 *byte_selectors, u8 *match_mask)
+{
+	struct dr_definer_object *definer_obj;
+	unsigned long id;
+
+	xa_for_each(&dmn->definers_xa, id, definer_obj) {
+		if (dr_definer_compare(definer_obj, format_id,
+				       dw_selectors, byte_selectors,
+				       match_mask))
+			return definer_obj;
+	}
+
+	return NULL;
+}
+
+static struct dr_definer_object *
+dr_definer_create_obj(struct mlx5dr_domain *dmn, u16 format_id,
+		      u8 *dw_selectors, u8 *byte_selectors, u8 *match_mask)
+{
+	struct dr_definer_object *definer_obj;
+	int ret = 0;
+
+	definer_obj = kzalloc(sizeof(*definer_obj), GFP_KERNEL);
+	if (!definer_obj)
+		return NULL;
+
+	ret = mlx5dr_cmd_create_definer(dmn->mdev,
+					format_id,
+					dw_selectors,
+					byte_selectors,
+					match_mask,
+					&definer_obj->id);
+	if (ret)
+		goto err_free_definer_obj;
+
+	/* Definer ID can have 32 bits, but STE format
+	 * supports only definers with 8 bit IDs.
+	 */
+	if (definer_obj->id > 0xff) {
+		mlx5dr_err(dmn, "Unsupported definer ID (%d)\n", definer_obj->id);
+		goto err_destroy_definer;
+	}
+
+	definer_obj->format_id = format_id;
+	memcpy(definer_obj->dw_selectors, dw_selectors, sizeof(definer_obj->dw_selectors));
+	memcpy(definer_obj->byte_selectors, byte_selectors, sizeof(definer_obj->byte_selectors));
+	memcpy(definer_obj->match_mask, match_mask, sizeof(definer_obj->match_mask));
+
+	refcount_set(&definer_obj->refcount, 1);
+
+	ret = xa_insert(&dmn->definers_xa, definer_obj->id, definer_obj, GFP_KERNEL);
+	if (ret) {
+		mlx5dr_dbg(dmn, "Couldn't insert new definer into xarray (%d)\n", ret);
+		goto err_destroy_definer;
+	}
+
+	return definer_obj;
+
+err_destroy_definer:
+	mlx5dr_cmd_destroy_definer(dmn->mdev, definer_obj->id);
+err_free_definer_obj:
+	kfree(definer_obj);
+
+	return NULL;
+}
+
+static void dr_definer_destroy_obj(struct mlx5dr_domain *dmn,
+				   struct dr_definer_object *definer_obj)
+{
+	mlx5dr_cmd_destroy_definer(dmn->mdev, definer_obj->id);
+	xa_erase(&dmn->definers_xa, definer_obj->id);
+	kfree(definer_obj);
+}
+
+int mlx5dr_definer_get(struct mlx5dr_domain *dmn, u16 format_id,
+		       u8 *dw_selectors, u8 *byte_selectors,
+		       u8 *match_mask, u32 *definer_id)
+{
+	struct dr_definer_object *definer_obj;
+	int ret = 0;
+
+	definer_obj = dr_definer_find_obj(dmn, format_id, dw_selectors,
+					  byte_selectors, match_mask);
+	if (!definer_obj) {
+		definer_obj = dr_definer_create_obj(dmn, format_id,
+						    dw_selectors, byte_selectors,
+						    match_mask);
+		if (!definer_obj)
+			return -ENOMEM;
+	} else {
+		refcount_inc(&definer_obj->refcount);
+	}
+
+	*definer_id = definer_obj->id;
+
+	return ret;
+}
+
+void mlx5dr_definer_put(struct mlx5dr_domain *dmn, u32 definer_id)
+{
+	struct dr_definer_object *definer_obj;
+
+	definer_obj = xa_load(&dmn->definers_xa, definer_id);
+	if (!definer_obj) {
+		mlx5dr_err(dmn, "Definer ID %d not found\n", definer_id);
+		return;
+	}
+
+	if (refcount_dec_and_test(&definer_obj->refcount))
+		dr_definer_destroy_obj(dmn, definer_obj);
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c
index 9a9836218c8e..5b8bb2ca31e6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c
@@ -425,10 +425,11 @@ mlx5dr_domain_create(struct mlx5_core_dev *mdev, enum mlx5dr_domain_type type)
 	refcount_set(&dmn->refcount, 1);
 	mutex_init(&dmn->info.rx.mutex);
 	mutex_init(&dmn->info.tx.mutex);
+	xa_init(&dmn->definers_xa);
 
 	if (dr_domain_caps_init(mdev, dmn)) {
 		mlx5dr_err(dmn, "Failed init domain, no caps\n");
-		goto free_domain;
+		goto def_xa_destroy;
 	}
 
 	dmn->info.max_log_action_icm_sz = DR_CHUNK_SIZE_4K;
@@ -453,7 +454,8 @@ mlx5dr_domain_create(struct mlx5_core_dev *mdev, enum mlx5dr_domain_type type)
 
 uninit_caps:
 	dr_domain_caps_uninit(dmn);
-free_domain:
+def_xa_destroy:
+	xa_destroy(&dmn->definers_xa);
 	kfree(dmn);
 	return NULL;
 }
@@ -493,6 +495,7 @@ int mlx5dr_domain_destroy(struct mlx5dr_domain *dmn)
 	dr_domain_uninit_csum_recalc_fts(dmn);
 	dr_domain_uninit_resources(dmn);
 	dr_domain_caps_uninit(dmn);
+	xa_destroy(&dmn->definers_xa);
 	mutex_destroy(&dmn->info.tx.mutex);
 	mutex_destroy(&dmn->info.rx.mutex);
 	kfree(dmn);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h
index 804268b487d8..94093c3b55a5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h
@@ -925,6 +925,7 @@ struct mlx5dr_domain {
 	struct mlx5dr_ste_ctx *ste_ctx;
 	struct list_head dbg_tbl_list;
 	struct mlx5dr_dbg_dump_info dump_info;
+	struct xarray definers_xa;
 };
 
 struct mlx5dr_table_rx_tx {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h b/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h
index 84ed77763b21..6ea50436ea61 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h
@@ -142,6 +142,11 @@ mlx5dr_action_create_aso(struct mlx5dr_domain *dmn,
 
 int mlx5dr_action_destroy(struct mlx5dr_action *action);
 
+int mlx5dr_definer_get(struct mlx5dr_domain *dmn, u16 format_id,
+		       u8 *dw_selectors, u8 *byte_selectors,
+		       u8 *match_mask, u32 *definer_id);
+void mlx5dr_definer_put(struct mlx5dr_domain *dmn, u32 definer_id);
+
 static inline bool
 mlx5dr_is_supported(struct mlx5_core_dev *dev)
 {