diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
index 4d884f7295..9ce973d95c 100644
--- a/drivers/net/mlx5/mlx5_mr.c
+++ b/drivers/net/mlx5/mlx5_mr.c
@@ -17,19 +17,6 @@
 #include "mlx5_rx.h"
 #include "mlx5_tx.h"
 
-struct mr_find_contig_memsegs_data {
-	uintptr_t addr;
-	uintptr_t start;
-	uintptr_t end;
-	const struct rte_memseg_list *msl;
-};
-
-struct mr_update_mp_data {
-	struct rte_eth_dev *dev;
-	struct mlx5_mr_ctrl *mr_ctrl;
-	int ret;
-};
-
 /**
  * Callback for memory event. This can be called from both primary and secondary
  * process.
@@ -134,70 +121,7 @@ mlx5_tx_mb2mr_bh(struct mlx5_txq_data *txq, struct rte_mbuf *mb)
 		}
 		/* Fallback for generic mechanism in corner cases. */
 	}
-	lkey = mlx5_tx_addr2mr_bh(txq, addr);
-	if (lkey == UINT32_MAX && rte_errno == ENXIO) {
-		/* Mempool may have externally allocated memory. */
-		return mlx5_tx_update_ext_mp(txq, addr, mlx5_mb2mp(mb));
-	}
-	return lkey;
-}
-
-/**
- * Called during rte_mempool_mem_iter() by mlx5_mr_update_ext_mp().
- *
- * Externally allocated chunk is registered and a MR is created for the chunk.
- * The MR object is added to the global list. If memseg list of a MR object
- * (mr->msl) is null, the MR object can be regarded as externally allocated
- * memory.
- *
- * Once external memory is registered, it should be static. If the memory is
- * freed and the virtual address range has different physical memory mapped
- * again, it may cause crash on device due to the wrong translation entry. PMD
- * can't track the free event of the external memory for now.
- */
-static void
-mlx5_mr_update_ext_mp_cb(struct rte_mempool *mp, void *opaque,
-			 struct rte_mempool_memhdr *memhdr,
-			 unsigned mem_idx __rte_unused)
-{
-	struct mr_update_mp_data *data = opaque;
-	struct rte_eth_dev *dev = data->dev;
-	struct mlx5_priv *priv = dev->data->dev_private;
-	struct mlx5_dev_ctx_shared *sh = priv->sh;
-	struct mlx5_mr_ctrl *mr_ctrl = data->mr_ctrl;
-	struct mlx5_mr *mr = NULL;
-	uintptr_t addr = (uintptr_t)memhdr->addr;
-	size_t len = memhdr->len;
-	struct mr_cache_entry entry;
-	uint32_t lkey;
-
-	MLX5_ASSERT(rte_eal_process_type() == RTE_PROC_PRIMARY);
-	/* If already registered, it should return. */
-	rte_rwlock_read_lock(&sh->share_cache.rwlock);
-	lkey = mlx5_mr_lookup_cache(&sh->share_cache, &entry, addr);
-	rte_rwlock_read_unlock(&sh->share_cache.rwlock);
-	if (lkey != UINT32_MAX)
-		return;
-	DRV_LOG(DEBUG, "port %u register MR for chunk #%d of mempool (%s)",
-		dev->data->port_id, mem_idx, mp->name);
-	mr = mlx5_create_mr_ext(sh->cdev->pd, addr, len, mp->socket_id,
-				sh->share_cache.reg_mr_cb);
-	if (!mr) {
-		DRV_LOG(WARNING,
-			"port %u unable to allocate a new MR of"
-			" mempool (%s).",
-			dev->data->port_id, mp->name);
-		data->ret = -1;
-		return;
-	}
-	rte_rwlock_write_lock(&sh->share_cache.rwlock);
-	LIST_INSERT_HEAD(&sh->share_cache.mr_list, mr, mr);
-	/* Insert to the global cache table. */
-	mlx5_mr_insert_cache(&sh->share_cache, mr);
-	rte_rwlock_write_unlock(&sh->share_cache.rwlock);
-	/* Insert to the local cache table */
-	mlx5_mr_addr2mr_bh(sh->cdev->pd, &priv->mp_id, &sh->share_cache,
-			   mr_ctrl, addr, sh->cdev->config.mr_ext_memseg_en);
+	return mlx5_tx_addr2mr_bh(txq, addr);
 }
 
 /**
@@ -331,67 +255,3 @@ mlx5_net_dma_unmap(struct rte_device *rte_dev, void *addr,
 	rte_rwlock_write_unlock(&sh->share_cache.rwlock);
 	return 0;
 }
-
-/**
- * Register MR for entire memory chunks in a Mempool having externally allocated
- * memory and fill in local cache.
- *
- * @param dev
- *   Pointer to Ethernet device.
- * @param mr_ctrl
- *   Pointer to per-queue MR control structure.
- * @param mp
- *   Pointer to registering Mempool.
- *
- * @return
- *   0 on success, -1 on failure.
- */
-static uint32_t
-mlx5_mr_update_ext_mp(struct rte_eth_dev *dev, struct mlx5_mr_ctrl *mr_ctrl,
-		      struct rte_mempool *mp)
-{
-	struct mr_update_mp_data data = {
-		.dev = dev,
-		.mr_ctrl = mr_ctrl,
-		.ret = 0,
-	};
-
-	rte_mempool_mem_iter(mp, mlx5_mr_update_ext_mp_cb, &data);
-	return data.ret;
-}
-
-/**
- * Register MR entire memory chunks in a Mempool having externally allocated
- * memory and search LKey of the address to return.
- *
- * @param dev
- *   Pointer to Ethernet device.
- * @param addr
- *   Search key.
- * @param mp
- *   Pointer to registering Mempool where addr belongs.
- *
- * @return
- *   LKey for address on success, UINT32_MAX on failure.
- */
-uint32_t
-mlx5_tx_update_ext_mp(struct mlx5_txq_data *txq, uintptr_t addr,
-		      struct rte_mempool *mp)
-{
-	struct mlx5_txq_ctrl *txq_ctrl =
-		container_of(txq, struct mlx5_txq_ctrl, txq);
-	struct mlx5_mr_ctrl *mr_ctrl = &txq->mr_ctrl;
-	struct mlx5_priv *priv = txq_ctrl->priv;
-
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
-		DRV_LOG(WARNING,
-			"port %u using address (%p) from unregistered mempool"
-			" having externally allocated memory"
-			" in secondary process, please create mempool"
-			" prior to rte_eth_dev_start()",
-			PORT_ID(priv), (void *)addr);
-		return UINT32_MAX;
-	}
-	mlx5_mr_update_ext_mp(ETH_DEV(priv), mr_ctrl, mp);
-	return mlx5_tx_addr2mr_bh(txq, addr);
-}
diff --git a/drivers/net/mlx5/mlx5_tx.h b/drivers/net/mlx5/mlx5_tx.h
index 77d6069755..a6aa34084c 100644
--- a/drivers/net/mlx5/mlx5_tx.h
+++ b/drivers/net/mlx5/mlx5_tx.h
@@ -239,8 +239,6 @@ int mlx5_tx_burst_mode_get(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 /* mlx5_mr.c */
 
 uint32_t mlx5_tx_mb2mr_bh(struct mlx5_txq_data *txq, struct rte_mbuf *mb);
-uint32_t mlx5_tx_update_ext_mp(struct mlx5_txq_data *txq, uintptr_t addr,
-			       struct rte_mempool *mp);
 
 /* mlx5_tx_empw.c */
 
