diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.h b/drivers/infiniband/hw/hns/hns_roce_cmd.h
index f0039a7..b1c9422 100644
--- a/drivers/infiniband/hw/hns/hns_roce_cmd.h
+++ b/drivers/infiniband/hw/hns/hns_roce_cmd.h
@@ -75,6 +75,9 @@ enum {
 	HNS_ROCE_CMD_DESTROY_MPT_BT1	= 0x29,
 	HNS_ROCE_CMD_DESTROY_MPT_BT2	= 0x2a,
 
+	/* MPT commands */
+	HNS_ROCE_CMD_QUERY_MPT		= 0x62,
+
 	/* SRQC BT commands */
 	HNS_ROCE_CMD_WRITE_SRQC_BT0	= 0x30,
 	HNS_ROCE_CMD_WRITE_SRQC_BT1	= 0x31,
diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index 31c7ab8..7b3f444 100644
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -170,6 +170,10 @@ enum {
 	HNS_ROCE_OPCODE_RDMA_WITH_IMM_RECEIVE	= 0x07,
 };
 
+enum {
+	HNS_ROCE_CAP_FLAG_REREG_MR		= BIT(0),
+};
+
 enum hns_roce_mtt_type {
 	MTT_TYPE_WQE,
 	MTT_TYPE_CQE,
@@ -567,6 +571,7 @@ struct hns_roce_caps {
 	u32		cqe_buf_pg_sz;
 	u32		cqe_hop_num;
 	u32		chunk_sz;	/* chunk size in non multihop mode*/
+	u64		flags;
 };
 
 struct hns_roce_hw {
@@ -587,6 +592,10 @@ struct hns_roce_hw {
 			enum ib_mtu mtu);
 	int (*write_mtpt)(void *mb_buf, struct hns_roce_mr *mr,
 			  unsigned long mtpt_idx);
+	int (*rereg_write_mtpt)(struct hns_roce_dev *hr_dev,
+				struct hns_roce_mr *mr, int flags, u32 pdn,
+				int mr_access_flags, u64 iova, u64 size,
+				void *mb_buf);
 	void (*write_cqc)(struct hns_roce_dev *hr_dev,
 			  struct hns_roce_cq *hr_cq, void *mb_buf, u64 *mtts,
 			  dma_addr_t dma_handle, int nent, u32 vector);
@@ -783,6 +792,9 @@ struct ib_pd *hns_roce_alloc_pd(struct ib_device *ib_dev,
 struct ib_mr *hns_roce_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 				   u64 virt_addr, int access_flags,
 				   struct ib_udata *udata);
+int hns_roce_rereg_user_mr(struct ib_mr *mr, int flags, u64 start, u64 length,
+			   u64 virt_addr, int mr_access_flags, struct ib_pd *pd,
+			   struct ib_udata *udata);
 int hns_roce_dereg_mr(struct ib_mr *ibmr);
 int hns_roce_hw2sw_mpt(struct hns_roce_dev *hr_dev,
 		       struct hns_roce_cmd_mailbox *mailbox,
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index b0736c3..7e24e1f 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -945,6 +945,7 @@ static int hns_roce_v2_profile(struct hns_roce_dev *hr_dev)
 	caps->cqe_hop_num	= HNS_ROCE_CQE_HOP_NUM;
 	caps->chunk_sz		= HNS_ROCE_V2_TABLE_CHUNK_SIZE;
 
+	caps->flags		= HNS_ROCE_CAP_FLAG_REREG_MR;
 	caps->pkey_table_len[0] = 1;
 	caps->gid_table_len[0] = 2;
 	caps->local_ca_ack_delay = 0;
@@ -1183,6 +1184,57 @@ static int hns_roce_v2_write_mtpt(void *mb_buf, struct hns_roce_mr *mr,
 	return 0;
 }
 
+static int hns_roce_v2_rereg_write_mtpt(struct hns_roce_dev *hr_dev,
+					struct hns_roce_mr *mr, int flags,
+					u32 pdn, int mr_access_flags, u64 iova,
+					u64 size, void *mb_buf)
+{
+	struct hns_roce_v2_mpt_entry *mpt_entry = mb_buf;
+
+	if (flags & IB_MR_REREG_PD) {
+		roce_set_field(mpt_entry->byte_4_pd_hop_st, V2_MPT_BYTE_4_PD_M,
+			       V2_MPT_BYTE_4_PD_S, pdn);
+		mr->pd = pdn;
+	}
+
+	if (flags & IB_MR_REREG_ACCESS) {
+		roce_set_bit(mpt_entry->byte_8_mw_cnt_en,
+			     V2_MPT_BYTE_8_BIND_EN_S,
+			     (mr_access_flags & IB_ACCESS_MW_BIND ? 1 : 0));
+		roce_set_bit(mpt_entry->byte_8_mw_cnt_en,
+			   V2_MPT_BYTE_8_ATOMIC_EN_S,
+			   (mr_access_flags & IB_ACCESS_REMOTE_ATOMIC ? 1 : 0));
+		roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_RR_EN_S,
+			     (mr_access_flags & IB_ACCESS_REMOTE_READ ? 1 : 0));
+		roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_RW_EN_S,
+			    (mr_access_flags & IB_ACCESS_REMOTE_WRITE ? 1 : 0));
+		roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_LW_EN_S,
+			     (mr_access_flags & IB_ACCESS_LOCAL_WRITE ? 1 : 0));
+	}
+
+	if (flags & IB_MR_REREG_TRANS) {
+		mpt_entry->va_l = cpu_to_le32(lower_32_bits(iova));
+		mpt_entry->va_h = cpu_to_le32(upper_32_bits(iova));
+		mpt_entry->len_l = cpu_to_le32(lower_32_bits(size));
+		mpt_entry->len_h = cpu_to_le32(upper_32_bits(size));
+
+		mpt_entry->pbl_size = cpu_to_le32(mr->pbl_size);
+		mpt_entry->pbl_ba_l =
+				cpu_to_le32(lower_32_bits(mr->pbl_ba >> 3));
+		roce_set_field(mpt_entry->byte_48_mode_ba,
+			       V2_MPT_BYTE_48_PBL_BA_H_M,
+			       V2_MPT_BYTE_48_PBL_BA_H_S,
+			       upper_32_bits(mr->pbl_ba >> 3));
+		mpt_entry->byte_48_mode_ba =
+				cpu_to_le32(mpt_entry->byte_48_mode_ba);
+
+		mr->iova = iova;
+		mr->size = size;
+	}
+
+	return 0;
+}
+
 static void *get_cqe_v2(struct hns_roce_cq *hr_cq, int n)
 {
 	return hns_roce_buf_offset(&hr_cq->hr_buf.hr_buf,
@@ -3044,6 +3096,7 @@ static int hns_roce_v2_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
 	.set_gid = hns_roce_v2_set_gid,
 	.set_mac = hns_roce_v2_set_mac,
 	.write_mtpt = hns_roce_v2_write_mtpt,
+	.rereg_write_mtpt = hns_roce_v2_rereg_write_mtpt,
 	.write_cqc = hns_roce_v2_write_cqc,
 	.set_hem = hns_roce_v2_set_hem,
 	.clear_hem = hns_roce_v2_clear_hem,
diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
index 31120fd..63a2f3b 100644
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -508,6 +508,10 @@ static int hns_roce_register_device(struct hns_roce_dev *hr_dev)
 	ib_dev->get_dma_mr		= hns_roce_get_dma_mr;
 	ib_dev->reg_user_mr		= hns_roce_reg_user_mr;
 	ib_dev->dereg_mr		= hns_roce_dereg_mr;
+	if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_REREG_MR) {
+		ib_dev->rereg_user_mr	= hns_roce_rereg_user_mr;
+		ib_dev->uverbs_cmd_mask |= (1ULL << IB_USER_VERBS_CMD_REREG_MR);
+	}
 
 	/* OTHERS */
 	ib_dev->get_port_immutable	= hns_roce_port_immutable;
diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
index c47a5ee..da86a811 100644
--- a/drivers/infiniband/hw/hns/hns_roce_mr.c
+++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
@@ -1065,6 +1065,129 @@ struct ib_mr *hns_roce_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 	return ERR_PTR(ret);
 }
 
+int hns_roce_rereg_user_mr(struct ib_mr *ibmr, int flags, u64 start, u64 length,
+			   u64 virt_addr, int mr_access_flags, struct ib_pd *pd,
+			   struct ib_udata *udata)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
+	struct hns_roce_mr *mr = to_hr_mr(ibmr);
+	struct hns_roce_cmd_mailbox *mailbox;
+	struct device *dev = hr_dev->dev;
+	unsigned long mtpt_idx;
+	u32 pdn = 0;
+	int npages;
+	int ret;
+
+	if (!mr->enabled)
+		return -EINVAL;
+
+	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
+	if (IS_ERR(mailbox))
+		return PTR_ERR(mailbox);
+
+	mtpt_idx = key_to_hw_index(mr->key) & (hr_dev->caps.num_mtpts - 1);
+	ret = hns_roce_cmd_mbox(hr_dev, 0, mailbox->dma, mtpt_idx, 0,
+				HNS_ROCE_CMD_QUERY_MPT,
+				HNS_ROCE_CMD_TIMEOUT_MSECS);
+	if (ret)
+		goto free_cmd_mbox;
+
+	ret = hns_roce_hw2sw_mpt(hr_dev, NULL, mtpt_idx);
+	if (ret)
+		dev_warn(dev, "HW2SW_MPT failed (%d)\n", ret);
+
+	mr->enabled = 0;
+
+	if (flags & IB_MR_REREG_PD)
+		pdn = to_hr_pd(pd)->pdn;
+
+	if (flags & IB_MR_REREG_TRANS) {
+		if (mr->size != ~0ULL) {
+			npages = ib_umem_page_count(mr->umem);
+
+			if (hr_dev->caps.pbl_hop_num)
+				hns_roce_mhop_free(hr_dev, mr);
+			else
+				dma_free_coherent(dev, npages * 8, mr->pbl_buf,
+						  mr->pbl_dma_addr);
+		}
+		ib_umem_release(mr->umem);
+
+		mr->umem = ib_umem_get(ibmr->uobject->context, start, length,
+				       mr_access_flags, 0);
+		if (IS_ERR(mr->umem)) {
+			ret = PTR_ERR(mr->umem);
+			mr->umem = NULL;
+			goto free_cmd_mbox;
+		}
+		npages = ib_umem_page_count(mr->umem);
+
+		if (hr_dev->caps.pbl_hop_num) {
+			ret = hns_roce_mhop_alloc(hr_dev, npages, mr);
+			if (ret)
+				goto release_umem;
+		} else {
+			mr->pbl_buf = dma_alloc_coherent(dev, npages * 8,
+							 &(mr->pbl_dma_addr),
+							 GFP_KERNEL);
+			if (!mr->pbl_buf) {
+				ret = -ENOMEM;
+				goto release_umem;
+			}
+		}
+	}
+
+	ret = hr_dev->hw->rereg_write_mtpt(hr_dev, mr, flags, pdn,
+					   mr_access_flags, virt_addr,
+					   length, mailbox->buf);
+	if (ret) {
+		if (flags & IB_MR_REREG_TRANS)
+			goto release_umem;
+		else
+			goto free_cmd_mbox;
+	}
+
+	if (flags & IB_MR_REREG_TRANS) {
+		ret = hns_roce_ib_umem_write_mr(hr_dev, mr, mr->umem);
+		if (ret) {
+			if (mr->size != ~0ULL) {
+				npages = ib_umem_page_count(mr->umem);
+
+				if (hr_dev->caps.pbl_hop_num)
+					hns_roce_mhop_free(hr_dev, mr);
+				else
+					dma_free_coherent(dev, npages * 8,
+							  mr->pbl_buf,
+							  mr->pbl_dma_addr);
+			}
+
+			goto release_umem;
+		}
+	}
+
+	ret = hns_roce_sw2hw_mpt(hr_dev, mailbox, mtpt_idx);
+	if (ret) {
+		dev_err(dev, "SW2HW_MPT failed (%d)\n", ret);
+		goto release_umem;
+	}
+
+	mr->enabled = 1;
+	if (flags & IB_MR_REREG_ACCESS)
+		mr->access = mr_access_flags;
+
+	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
+
+	return 0;
+
+release_umem:
+	ib_umem_release(mr->umem);
+
+free_cmd_mbox:
+	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
+
+	return ret;
+}
+
 int hns_roce_dereg_mr(struct ib_mr *ibmr)
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
