diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
index 2b33836f3d3e..bf57799fde63 100644
--- a/drivers/nvme/target/Makefile
+++ b/drivers/nvme/target/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_NVME_TARGET_TCP)		+= nvmet-tcp.o
 
 nvmet-y		+= core.o configfs.o admin-cmd.o fabrics-cmd.o \
 			discovery.o io-cmd-file.o io-cmd-bdev.o
+nvmet-$(CONFIG_NVME_TARGET_PASSTHRU)	+= io-cmd-passthru.o
 nvme-loop-y	+= loop.o
 nvmet-rdma-y	+= rdma.o
 nvmet-fc-y	+= fc.o
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index d6dcb86d8be7..256f765e772b 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -896,6 +896,8 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
 	if (unlikely(!req->sq->ctrl))
 		/* will return an error for any Non-connect command: */
 		status = nvmet_parse_connect_cmd(req);
+	else if (nvmet_req_passthru_ctrl(req))
+		status = nvmet_parse_passthru_cmd(req);
 	else if (likely(req->sq->qid != 0))
 		status = nvmet_parse_io_cmd(req);
 	else if (nvme_is_fabrics(req->cmd))
@@ -1463,11 +1465,15 @@ static int __init nvmet_init(void)
 
 	nvmet_ana_group_enabled[NVMET_DEFAULT_ANA_GRPID] = 1;
 
+	error = nvmet_passthru_init();
+	if (error)
+		goto out;
+
 	buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq",
 			WQ_MEM_RECLAIM, 0);
 	if (!buffered_io_wq) {
 		error = -ENOMEM;
-		goto out;
+		goto out_passthru_destroy;
 	}
 
 	error = nvmet_init_discovery();
@@ -1483,6 +1489,8 @@ static int __init nvmet_init(void)
 	nvmet_exit_discovery();
 out_free_work_queue:
 	destroy_workqueue(buffered_io_wq);
+out_passthru_destroy:
+	nvmet_passthru_destroy();
 out:
 	return error;
 }
@@ -1493,6 +1501,7 @@ static void __exit nvmet_exit(void)
 	nvmet_exit_discovery();
 	ida_destroy(&cntlid_ida);
 	destroy_workqueue(buffered_io_wq);
+	nvmet_passthru_destroy();
 
 	BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_entry) != 1024);
 	BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_hdr) != 1024);
diff --git a/drivers/nvme/target/io-cmd-passthru.c b/drivers/nvme/target/io-cmd-passthru.c
new file mode 100644
index 000000000000..2437fc0a74a4
--- /dev/null
+++ b/drivers/nvme/target/io-cmd-passthru.c
@@ -0,0 +1,564 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NVMe Over Fabrics Target Passthrough command implementation.
+ *
+ * Copyright (c) 2017-2018 Western Digital Corporation or its
+ * affiliates.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+
+#include "../host/nvme.h"
+#include "nvmet.h"
+
+static struct workqueue_struct *passthru_wq;
+
+int nvmet_passthru_init(void)
+{
+	passthru_wq = alloc_workqueue("nvmet-passthru-wq", WQ_MEM_RECLAIM, 0);
+	if (!passthru_wq)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void nvmet_passthru_destroy(void)
+{
+	destroy_workqueue(passthru_wq);
+}
+
+static void nvmet_passthru_req_complete(struct nvmet_req *req,
+		struct request *rq, u16 status)
+{
+	nvmet_req_complete(req, status);
+
+	if (rq)
+		blk_put_request(rq);
+}
+
+static void nvmet_passthru_req_done(struct request *rq,
+		blk_status_t blk_status)
+{
+	struct nvmet_req *req = rq->end_io_data;
+	u16 status = nvme_req(rq)->status;
+
+	req->cqe->result.u32 = nvme_req(rq)->result.u32;
+
+	nvmet_passthru_req_complete(req, rq, status);
+}
+
+static u16 nvmet_passthru_override_format_nvm(struct nvmet_req *req)
+{
+	int lbaf = le32_to_cpu(req->cmd->format.cdw10) & 0x0000000F;
+	int nsid = le32_to_cpu(req->cmd->format.nsid);
+	u16 status = NVME_SC_SUCCESS;
+	struct nvme_id_ns *id;
+
+	id = nvme_identify_ns(nvmet_req_passthru_ctrl(req), nsid);
+	if (!id)
+		return NVME_SC_INTERNAL;
+	/*
+	 * XXX: Please update this code once NVMeOF target starts supporting
+	 * metadata. We don't support ns lba format with metadata over fabrics
+	 * right now, so report an error if format nvm cmd tries to format
+	 * a namespace with the LBA format which has metadata.
+	 */
+	if (id->lbaf[lbaf].ms)
+		status = NVME_SC_INVALID_NS;
+
+	kfree(id);
+	return status;
+}
+
+static void nvmet_passthru_set_mdts(struct nvmet_ctrl *ctrl,
+				    struct nvme_id_ctrl *id)
+{
+	struct nvme_ctrl *pctrl = ctrl->subsys->passthru_ctrl;
+	u32 max_hw_sectors;
+	int page_shift;
+
+	/*
+	 * The passthru NVMe driver may have a limit on the number
+	 * of segments which depends on the host's memory fragementation.
+	 * To solve this, ensure mdts is limitted to the pages equal to
+	 * the number of segments.
+	 */
+
+	max_hw_sectors = min_not_zero(pctrl->max_segments << (PAGE_SHIFT - 9),
+				      pctrl->max_hw_sectors);
+
+	page_shift = NVME_CAP_MPSMIN(ctrl->cap) + 12;
+
+	id->mdts = ilog2(max_hw_sectors) + 9 - page_shift;
+}
+
+static u16 nvmet_passthru_override_id_ctrl(struct nvmet_req *req)
+{
+	struct nvmet_ctrl *ctrl = req->sq->ctrl;
+	u16 status = NVME_SC_SUCCESS;
+	struct nvme_id_ctrl *id;
+
+	id = kzalloc(sizeof(*id), GFP_KERNEL);
+	if (!id) {
+		status = NVME_SC_INTERNAL;
+		goto out;
+	}
+	status = nvmet_copy_from_sgl(req, 0, id, sizeof(*id));
+	if (status)
+		goto out_free;
+
+	id->cntlid = cpu_to_le16(ctrl->cntlid);
+	id->ver = cpu_to_le32(ctrl->subsys->ver);
+
+	nvmet_passthru_set_mdts(ctrl, id);
+
+	id->acl = 3;
+	/*
+	 * We export aerl limit for the fabrics controller, update this when
+	 * passthru based aerl support is added.
+	 */
+	id->aerl = NVMET_ASYNC_EVENTS - 1;
+
+	/* emulate kas as most of the PCIe ctrl don't have a support for kas */
+	id->kas = cpu_to_le16(NVMET_KAS);
+
+	/* don't support host memory buffer */
+	id->hmpre = 0;
+	id->hmmin = 0;
+
+	id->sqes = min_t(__u8, ((0x6 << 4) | 0x6), id->sqes);
+	id->cqes = min_t(__u8, ((0x4 << 4) | 0x4), id->cqes);
+	id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
+
+	/* don't support fuse commands */
+	id->fuses = 0;
+
+	id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
+	if (ctrl->ops->has_keyed_sgls)
+		id->sgls |= cpu_to_le32(1 << 2);
+	if (req->port->inline_data_size)
+		id->sgls |= cpu_to_le32(1 << 20);
+
+	/*
+	 * When passsthru controller is setup using nvme-loop transport it will
+	 * export the passthru ctrl subsysnqn (PCIe NVMe ctrl) and will fail in
+	 * the nvme/host/core.c in the nvme_init_subsystem()->nvme_active_ctrl()
+	 * code path with duplicate ctr subsynqn. In order to prevent that we
+	 * mask the passthru-ctrl subsysnqn with the target ctrl subsysnqn.
+	 */
+	memcpy(id->subnqn, ctrl->subsysnqn, sizeof(id->subnqn));
+
+	/* use fabric id-ctrl values */
+	id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
+				req->port->inline_data_size) / 16);
+	id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
+
+	id->msdbd = ctrl->ops->msdbd;
+
+	/* Support multipath connections with fabrics */
+	id->cmic |= 1 << 1;
+
+	status = nvmet_copy_to_sgl(req, 0, id, sizeof(struct nvme_id_ctrl));
+
+out_free:
+	kfree(id);
+out:
+	return status;
+}
+
+static u16 nvmet_passthru_override_id_ns(struct nvmet_req *req)
+{
+	u16 status = NVME_SC_SUCCESS;
+	struct nvme_id_ns *id;
+	int i;
+
+	id = kzalloc(sizeof(*id), GFP_KERNEL);
+	if (!id) {
+		status = NVME_SC_INTERNAL;
+		goto out;
+	}
+
+	status = nvmet_copy_from_sgl(req, 0, id, sizeof(struct nvme_id_ns));
+	if (status)
+		goto out_free;
+
+	for (i = 0; i < (id->nlbaf + 1); i++)
+		if (id->lbaf[i].ms)
+			memset(&id->lbaf[i], 0, sizeof(id->lbaf[i]));
+
+	id->flbas = id->flbas & ~(1 << 4);
+	id->mc = 0;
+
+	status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+
+out_free:
+	kfree(id);
+out:
+	return status;
+}
+
+static u16 nvmet_passthru_fixup_identify(struct nvmet_req *req)
+{
+	u16 status = NVME_SC_SUCCESS;
+
+	switch (req->cmd->identify.cns) {
+	case NVME_ID_CNS_CTRL:
+		status = nvmet_passthru_override_id_ctrl(req);
+		break;
+	case NVME_ID_CNS_NS:
+		status = nvmet_passthru_override_id_ns(req);
+		break;
+	}
+	return status;
+}
+
+static u16 nvmet_passthru_admin_passthru_start(struct nvmet_req *req)
+{
+	u16 status = NVME_SC_SUCCESS;
+
+	switch (req->cmd->common.opcode) {
+	case nvme_admin_format_nvm:
+		status = nvmet_passthru_override_format_nvm(req);
+		break;
+	}
+	return status;
+}
+
+static u16 nvmet_passthru_admin_passthru_end(struct nvmet_req *req)
+{
+	u8 aer_type = NVME_AER_TYPE_NOTICE;
+	u16 status = NVME_SC_SUCCESS;
+
+	switch (req->cmd->common.opcode) {
+	case nvme_admin_identify:
+		status = nvmet_passthru_fixup_identify(req);
+		break;
+	case nvme_admin_ns_mgmt:
+	case nvme_admin_ns_attach:
+	case nvme_admin_format_nvm:
+		if (nvmet_add_async_event(req->sq->ctrl, aer_type, 0, 0))
+			status = NVME_SC_INTERNAL;
+		break;
+	}
+	return status;
+}
+
+static void nvmet_passthru_execute_admin_cmd(struct nvmet_req *req)
+{
+	u8 opcode = req->cmd->common.opcode;
+	u32 effects;
+	u16 status;
+
+	status = nvmet_passthru_admin_passthru_start(req);
+	if (status)
+		goto out;
+
+	effects = nvme_passthru_start(nvmet_req_passthru_ctrl(req), NULL,
+				      opcode);
+
+	/*
+	 * Admin Commands have side effects and it is better to handle those
+	 * side effects in the submission thread context than in the request
+	 * completion path, which is in the interrupt context. Also in this
+	 * way, we keep the passhru admin command code path consistent with the
+	 * nvme/host/core.c sync command submission APIs/IOCTLs and use
+	 * nvme_passthru_start/end() to handle side effects consistently.
+	 */
+	blk_execute_rq(req->p.rq->q, NULL, req->p.rq, 0);
+
+	nvme_passthru_end(nvmet_req_passthru_ctrl(req), effects);
+	status = nvmet_passthru_admin_passthru_end(req);
+out:
+	if (status == NVME_SC_SUCCESS) {
+		nvmet_set_result(req, nvme_req(req->p.rq)->result.u32);
+		status = nvme_req(req->p.rq)->status;
+	}
+
+	nvmet_passthru_req_complete(req, req->p.rq, status);
+}
+
+static int nvmet_passthru_map_sg(struct nvmet_req *req, struct request *rq)
+{
+	int sg_cnt = req->sg_cnt;
+	struct scatterlist *sg;
+	int op = REQ_OP_READ;
+	int op_flags = 0;
+	struct bio *bio;
+	int i, ret;
+
+	if (nvme_is_write(req->cmd)) {
+		op = REQ_OP_WRITE;
+		op_flags = REQ_SYNC | REQ_IDLE;
+	}
+
+	bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
+	bio->bi_end_io = bio_put;
+
+	for_each_sg(req->sg, sg, req->sg_cnt, i) {
+		if (bio_add_page(bio, sg_page(sg), sg->length,
+				 sg->offset) != sg->length) {
+			ret = blk_rq_append_bio(rq, &bio);
+			if (unlikely(ret))
+				return ret;
+
+			bio_set_op_attrs(bio, op, op_flags);
+			bio = bio_alloc(GFP_KERNEL,
+					min(sg_cnt, BIO_MAX_PAGES));
+		}
+		sg_cnt--;
+	}
+
+	ret = blk_rq_append_bio(rq, &bio);
+	if (unlikely(ret))
+		return ret;
+
+	return 0;
+}
+
+static struct request *nvmet_passthru_blk_make_request(struct nvmet_req *req,
+		struct nvme_ns *ns, gfp_t gfp_mask)
+{
+	struct nvme_ctrl *passthru_ctrl = nvmet_req_passthru_ctrl(req);
+	struct nvme_command *cmd = req->cmd;
+	struct request_queue *q;
+	struct request *rq;
+	int ret;
+
+	if (ns)
+		q = ns->queue;
+	else
+		q = passthru_ctrl->admin_q;
+
+	rq = nvme_alloc_request(q, cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
+	if (unlikely(IS_ERR(rq)))
+		return rq;
+
+	if (req->sg_cnt) {
+		ret = nvmet_passthru_map_sg(req, rq);
+		if (unlikely(ret)) {
+			blk_put_request(rq);
+			return ERR_PTR(ret);
+		}
+	}
+
+	/*
+	 * We don't support fused cmds, also nvme-pci driver uses its own
+	 * sgl_threshold parameter to decide whether to use SGLs or PRPs hence
+	 * turn off those bits in the flags.
+	 */
+	req->cmd->common.flags &= ~(NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND |
+			NVME_CMD_SGL_ALL);
+	return rq;
+}
+
+
+static void nvmet_passthru_execute_admin_work(struct work_struct *w)
+{
+	struct nvmet_req *req = container_of(w, struct nvmet_req, p.work);
+
+	nvmet_passthru_execute_admin_cmd(req);
+}
+
+static void nvmet_passthru_submit_admin_cmd(struct nvmet_req *req)
+{
+	INIT_WORK(&req->p.work, nvmet_passthru_execute_admin_work);
+	queue_work(passthru_wq, &req->p.work);
+}
+
+static void nvmet_passthru_execute_cmd(struct nvmet_req *req)
+{
+	struct request *rq = NULL;
+	struct nvme_ns *ns = NULL;
+	u16 status;
+
+	if (likely(req->sq->qid != 0)) {
+		u32 nsid = le32_to_cpu(req->cmd->common.nsid);
+
+		ns = nvme_find_get_ns(nvmet_req_passthru_ctrl(req), nsid);
+		if (unlikely(!ns)) {
+			pr_err("failed to get passthru ns nsid:%u\n", nsid);
+			status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+			goto fail_out;
+		}
+	}
+
+	rq = nvmet_passthru_blk_make_request(req, ns, GFP_KERNEL);
+	if (unlikely(IS_ERR(rq))) {
+		rq = NULL;
+		status = NVME_SC_INTERNAL;
+		goto fail_out;
+	}
+
+	if (unlikely(blk_rq_nr_phys_segments(rq) > queue_max_segments(rq->q) ||
+	    (blk_rq_payload_bytes(rq) >> 9) > queue_max_hw_sectors(rq->q))) {
+		status = NVME_SC_INVALID_FIELD;
+		goto fail_out;
+	}
+
+	rq->end_io_data = req;
+	if (req->sq->qid != 0) {
+		blk_execute_rq_nowait(rq->q, NULL, rq, 0,
+				      nvmet_passthru_req_done);
+	} else {
+		req->p.rq = rq;
+		nvmet_passthru_submit_admin_cmd(req);
+	}
+
+	if (ns)
+		nvme_put_ns(ns);
+
+	return;
+
+fail_out:
+	if (ns)
+		nvme_put_ns(ns);
+	nvmet_passthru_req_complete(req, rq, status);
+}
+
+/*
+ * We emulate commands which are not routed through the existing target
+ * code and not supported by the passthru ctrl. E.g consider a scenario where
+ * passthru ctrl version is < 1.3.0. Target Fabrics ctrl version is >= 1.3.0
+ * in that case in order to be fabrics compliant we need to emulate ns-desc-list
+ * command which is 1.3.0 compliant but not present for the passthru ctrl due
+ * to lower version.
+ */
+static void nvmet_passthru_emulate_id_desclist(struct nvmet_req *req)
+{
+	int nsid = le32_to_cpu(req->cmd->common.nsid);
+	u16 status = NVME_SC_SUCCESS;
+	struct nvme_ns_ids *ids;
+	struct nvme_ns *ns;
+	off_t off = 0;
+
+	ns = nvme_find_get_ns(nvmet_req_passthru_ctrl(req), nsid);
+	if (unlikely(!ns)) {
+		pr_err("failed to get passthru ns nsid:%u\n", nsid);
+		status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+		goto out;
+	}
+	/*
+	 * Instead of refactoring and creating helpers, keep it simple and
+	 * just re-use the code from admin-cmd.c ->
+	 * nvmet_execute_identify_ns_desclist().
+	 */
+	ids = &ns->head->ids;
+	if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) {
+		status = nvmet_copy_ns_identifier(req, NVME_NIDT_EUI64,
+						  NVME_NIDT_EUI64_LEN,
+						  &ids->eui64, &off);
+		if (status)
+			goto out_put_ns;
+	}
+	if (memchr_inv(&ids->uuid, 0, sizeof(ids->uuid))) {
+		status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
+						  NVME_NIDT_UUID_LEN,
+						  &ids->uuid, &off);
+		if (status)
+			goto out_put_ns;
+	}
+	if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) {
+		status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
+						  NVME_NIDT_NGUID_LEN,
+						  &ids->nguid, &off);
+		if (status)
+			goto out_put_ns;
+	}
+
+	if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
+			off) != NVME_IDENTIFY_DATA_SIZE - off)
+		status = NVME_SC_INTERNAL | NVME_SC_DNR;
+out_put_ns:
+	nvme_put_ns(ns);
+out:
+	nvmet_req_complete(req, status);
+}
+
+/*
+ * In the passthru mode we support three types for commands:-
+ * 1. Commands which are black-listed.
+ * 2. Commands which are routed through target code.
+ * 3. Commands which are emulated in the target code, since we can't rely
+ *    on passthru-ctrl and cannot route through the target code.
+ */
+static u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req)
+{
+	struct nvme_command *cmd = req->cmd;
+	u16 status = 0;
+
+	if (cmd->common.opcode >= nvme_admin_vendor_unique_start) {
+		/*
+		 * Passthru all vendor unique commands
+		 */
+		req->execute = nvmet_passthru_execute_cmd;
+		return status;
+	}
+
+	switch (cmd->common.opcode) {
+	/* 2. commands which are routed through target code */
+	case nvme_admin_async_event:
+	/*
+	 * Right now we don't monitor any events for the passthru controller.
+	 * Instead generate asyn event notice for the ns-mgmt/format/attach
+	 * commands so that host can update it's ns-inventory.
+	 */
+		/* fallthru */
+	case nvme_admin_keep_alive:
+	/*
+	 * Most PCIe ctrls don't support keep alive cmd, we route keep alive
+	 * to the non-passthru mode. In future please change this code when
+	 * PCIe ctrls with keep alive support available.
+	 */
+		status = nvmet_parse_admin_cmd(req);
+		break;
+	case nvme_admin_set_features:
+		switch (le32_to_cpu(req->cmd->features.fid)) {
+		case NVME_FEAT_ASYNC_EVENT:
+		case NVME_FEAT_KATO:
+		case NVME_FEAT_NUM_QUEUES:
+			status = nvmet_parse_admin_cmd(req);
+			break;
+		default:
+			req->execute = nvmet_passthru_execute_cmd;
+		}
+		break;
+	/* 3. commands which are emulated in the passthru code */
+	case nvme_admin_identify:
+		switch (req->cmd->identify.cns) {
+		case NVME_ID_CNS_NS_DESC_LIST:
+			req->execute = nvmet_passthru_emulate_id_desclist;
+			break;
+		default:
+			req->execute = nvmet_passthru_execute_cmd;
+		}
+		break;
+	/* 4. By default, blacklist all admin commands */
+	default:
+
+		status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+		req->execute = NULL;
+		break;
+	}
+
+	return status;
+}
+
+u16 nvmet_parse_passthru_cmd(struct nvmet_req *req)
+{
+	int ret;
+
+	if (unlikely(req->cmd->common.opcode == nvme_fabrics_command))
+		return nvmet_parse_fabrics_cmd(req);
+	else if (unlikely(req->sq->ctrl->subsys->type == NVME_NQN_DISC))
+		return nvmet_parse_discovery_cmd(req);
+
+	ret = nvmet_check_ctrl_status(req, req->cmd);
+	if (unlikely(ret))
+		return ret;
+
+	if (unlikely(req->sq->qid == 0))
+		return nvmet_parse_passthru_admin_cmd(req);
+
+	req->execute = nvmet_passthru_execute_cmd;
+	return NVME_SC_SUCCESS;
+}
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 5dfd4e0ae096..daec1240307c 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -227,6 +227,10 @@ struct nvmet_subsys {
 
 	struct config_group	namespaces_group;
 	struct config_group	allowed_hosts_group;
+
+#ifdef CONFIG_NVME_TARGET_PASSTHRU
+	struct nvme_ctrl	*passthru_ctrl;
+#endif /* CONFIG_NVME_TARGET_PASSTHRU */
 };
 
 static inline struct nvmet_subsys *to_subsys(struct config_item *item)
@@ -302,6 +306,10 @@ struct nvmet_req {
 			struct bio_vec          *bvec;
 			struct work_struct      work;
 		} f;
+		struct {
+			struct request		*rq;
+			struct work_struct      work;
+		} p;
 	};
 	int			sg_cnt;
 	/* data length as parsed from the command: */
@@ -497,6 +505,44 @@ static inline u32 nvmet_rw_len(struct nvmet_req *req)
 			req->ns->blksize_shift;
 }
 
+#ifdef CONFIG_NVME_TARGET_PASSTHRU
+
+int nvmet_passthru_init(void);
+void nvmet_passthru_destroy(void);
+u16 nvmet_parse_passthru_cmd(struct nvmet_req *req);
+
+static inline
+struct nvme_ctrl *nvmet_passthru_ctrl(struct nvmet_subsys *subsys)
+{
+	return subsys->passthru_ctrl;
+}
+
+#else /* CONFIG_NVME_TARGET_PASSTHRU */
+
+static inline int nvmet_passthru_init(void)
+{
+	return 0;
+}
+static inline void nvmet_passthru_destroy(void)
+{
+}
+static inline u16 nvmet_parse_passthru_cmd(struct nvmet_req *req)
+{
+	return 0;
+}
+static inline
+struct nvme_ctrl *nvmet_passthru_ctrl(struct nvmet_subsys *subsys)
+{
+	return NULL;
+}
+
+#endif /* CONFIG_NVME_TARGET_PASSTHRU */
+
+static inline struct nvme_ctrl *nvmet_req_passthru_ctrl(struct nvmet_req *req)
+{
+	return nvmet_passthru_ctrl(req->sq->ctrl->subsys);
+}
+
 u16 errno_to_nvme_status(struct nvmet_req *req, int errno);
 
 /* Convert a 32-bit number to a 16-bit 0's based number */
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 01aa6a6c241d..ecbf9d9485b5 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -814,6 +814,7 @@ enum nvme_admin_opcode {
 	nvme_admin_security_send	= 0x81,
 	nvme_admin_security_recv	= 0x82,
 	nvme_admin_sanitize_nvm		= 0x84,
+	nvme_admin_vendor_unique_start	= 0xC0,
 };
 
 #define nvme_admin_opcode_name(opcode)	{ opcode, #opcode }
