Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2631 insertions, 0 deletions

diff --git a/src/spdk/lib/nvmf/tcp.c b/src/spdk/lib/nvmf/tcp.c
new file mode 100644
index 000000000..391d4bcf1
--- /dev/null
+++ b/src/spdk/lib/nvmf/tcp.c
@@ -0,0 +1,2631 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (c) Intel Corporation. All rights reserved.
+ *   Copyright (c) 2019, 2020 Mellanox Technologies LTD. All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "spdk/stdinc.h"
+#include "spdk/crc32.h"
+#include "spdk/endian.h"
+#include "spdk/assert.h"
+#include "spdk/thread.h"
+#include "spdk/nvmf_transport.h"
+#include "spdk/sock.h"
+#include "spdk/string.h"
+#include "spdk/trace.h"
+#include "spdk/util.h"
+
+#include "spdk_internal/assert.h"
+#include "spdk_internal/log.h"
+#include "spdk_internal/nvme_tcp.h"
+
+#include "nvmf_internal.h"
+
+#define NVMF_TCP_MAX_ACCEPT_SOCK_ONE_TIME 16
+#define SPDK_NVMF_TCP_DEFAULT_MAX_SOCK_PRIORITY 6
+
+const struct spdk_nvmf_transport_ops spdk_nvmf_transport_tcp;
+
+/* spdk nvmf related structure */
+enum spdk_nvmf_tcp_req_state {
+
+	/* The request is not currently in use */
+	TCP_REQUEST_STATE_FREE = 0,
+
+	/* Initial state when request first received */
+	TCP_REQUEST_STATE_NEW,
+
+	/* The request is queued until a data buffer is available. */
+	TCP_REQUEST_STATE_NEED_BUFFER,
+
+	/* The request is currently transferring data from the host to the controller. */
+	TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER,
+
+	/* The request is waiting for the R2T send acknowledgement. */
+	TCP_REQUEST_STATE_AWAITING_R2T_ACK,
+
+	/* The request is ready to execute at the block device */
+	TCP_REQUEST_STATE_READY_TO_EXECUTE,
+
+	/* The request is currently executing at the block device */
+	TCP_REQUEST_STATE_EXECUTING,
+
+	/* The request finished executing at the block device */
+	TCP_REQUEST_STATE_EXECUTED,
+
+	/* The request is ready to send a completion */
+	TCP_REQUEST_STATE_READY_TO_COMPLETE,
+
+	/* The request is currently transferring final pdus from the controller to the host. */
+	TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST,
+
+	/* The request completed and can be marked free. */
+	TCP_REQUEST_STATE_COMPLETED,
+
+	/* Terminator */
+	TCP_REQUEST_NUM_STATES,
+};
+
+static const char *spdk_nvmf_tcp_term_req_fes_str[] = {
+	"Invalid PDU Header Field",
+	"PDU Sequence Error",
+	"Header Digiest Error",
+	"Data Transfer Out of Range",
+	"R2T Limit Exceeded",
+	"Unsupported parameter",
+};
+
+#define OBJECT_NVMF_TCP_IO				0x80
+
+#define TRACE_GROUP_NVMF_TCP				0x5
+#define TRACE_TCP_REQUEST_STATE_NEW					SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x0)
+#define TRACE_TCP_REQUEST_STATE_NEED_BUFFER				SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x1)
+#define TRACE_TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER		SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x2)
+#define TRACE_TCP_REQUEST_STATE_READY_TO_EXECUTE			SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x3)
+#define TRACE_TCP_REQUEST_STATE_EXECUTING				SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x4)
+#define TRACE_TCP_REQUEST_STATE_EXECUTED				SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x5)
+#define TRACE_TCP_REQUEST_STATE_READY_TO_COMPLETE			SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x6)
+#define TRACE_TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST		SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x7)
+#define TRACE_TCP_REQUEST_STATE_COMPLETED				SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x8)
+#define TRACE_TCP_FLUSH_WRITEBUF_START					SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0x9)
+#define TRACE_TCP_FLUSH_WRITEBUF_DONE					SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0xA)
+#define TRACE_TCP_READ_FROM_SOCKET_DONE					SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0xB)
+#define TRACE_TCP_REQUEST_STATE_AWAIT_R2T_ACK				SPDK_TPOINT_ID(TRACE_GROUP_NVMF_TCP, 0xC)
+
+SPDK_TRACE_REGISTER_FN(nvmf_tcp_trace, "nvmf_tcp", TRACE_GROUP_NVMF_TCP)
+{
+	spdk_trace_register_object(OBJECT_NVMF_TCP_IO, 'r');
+	spdk_trace_register_description("TCP_REQ_NEW",
+					TRACE_TCP_REQUEST_STATE_NEW,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 1, 1, "");
+	spdk_trace_register_description("TCP_REQ_NEED_BUFFER",
+					TRACE_TCP_REQUEST_STATE_NEED_BUFFER,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_REQ_TX_H_TO_C",
+					TRACE_TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_REQ_RDY_TO_EXECUTE",
+					TRACE_TCP_REQUEST_STATE_READY_TO_EXECUTE,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_REQ_EXECUTING",
+					TRACE_TCP_REQUEST_STATE_EXECUTING,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_REQ_EXECUTED",
+					TRACE_TCP_REQUEST_STATE_EXECUTED,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_REQ_RDY_TO_COMPLETE",
+					TRACE_TCP_REQUEST_STATE_READY_TO_COMPLETE,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_REQ_TRANSFER_C2H",
+					TRACE_TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_REQ_COMPLETED",
+					TRACE_TCP_REQUEST_STATE_COMPLETED,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+	spdk_trace_register_description("TCP_WRITE_START",
+					TRACE_TCP_FLUSH_WRITEBUF_START,
+					OWNER_NONE, OBJECT_NONE, 0, 0, "");
+	spdk_trace_register_description("TCP_WRITE_DONE",
+					TRACE_TCP_FLUSH_WRITEBUF_DONE,
+					OWNER_NONE, OBJECT_NONE, 0, 0, "");
+	spdk_trace_register_description("TCP_READ_DONE",
+					TRACE_TCP_READ_FROM_SOCKET_DONE,
+					OWNER_NONE, OBJECT_NONE, 0, 0, "");
+	spdk_trace_register_description("TCP_REQ_AWAIT_R2T_ACK",
+					TRACE_TCP_REQUEST_STATE_AWAIT_R2T_ACK,
+					OWNER_NONE, OBJECT_NVMF_TCP_IO, 0, 1, "");
+}
+
+struct spdk_nvmf_tcp_req  {
+	struct spdk_nvmf_request		req;
+	struct spdk_nvme_cpl			rsp;
+	struct spdk_nvme_cmd			cmd;
+
+	/* A PDU that can be used for sending responses. This is
+	 * not the incoming PDU! */
+	struct nvme_tcp_pdu			*pdu;
+
+	/*
+	 * The PDU for a request may be used multiple times in serial over
+	 * the request's lifetime. For example, first to send an R2T, then
+	 * to send a completion. To catch mistakes where the PDU is used
+	 * twice at the same time, add a debug flag here for init/fini.
+	 */
+	bool					pdu_in_use;
+
+	/* In-capsule data buffer */
+	uint8_t					*buf;
+
+	bool					has_incapsule_data;
+
+	/* transfer_tag */
+	uint16_t				ttag;
+
+	enum spdk_nvmf_tcp_req_state		state;
+
+	/*
+	 * h2c_offset is used when we receive the h2c_data PDU.
+	 */
+	uint32_t				h2c_offset;
+
+	STAILQ_ENTRY(spdk_nvmf_tcp_req)		link;
+	TAILQ_ENTRY(spdk_nvmf_tcp_req)		state_link;
+};
+
+struct spdk_nvmf_tcp_qpair {
+	struct spdk_nvmf_qpair			qpair;
+	struct spdk_nvmf_tcp_poll_group		*group;
+	struct spdk_nvmf_tcp_port		*port;
+	struct spdk_sock			*sock;
+
+	enum nvme_tcp_pdu_recv_state		recv_state;
+	enum nvme_tcp_qpair_state		state;
+
+	/* PDU being actively received */
+	struct nvme_tcp_pdu			pdu_in_progress;
+	uint32_t				recv_buf_size;
+
+	/* This is a spare PDU used for sending special management
+	 * operations. Primarily, this is used for the initial
+	 * connection response and c2h termination request. */
+	struct nvme_tcp_pdu			mgmt_pdu;
+
+	TAILQ_HEAD(, nvme_tcp_pdu)		send_queue;
+
+	/* Arrays of in-capsule buffers, requests, and pdus.
+	 * Each array is 'resource_count' number of elements */
+	void					*bufs;
+	struct spdk_nvmf_tcp_req		*reqs;
+	struct nvme_tcp_pdu			*pdus;
+	uint32_t				resource_count;
+
+	/* Queues to track the requests in all states */
+	TAILQ_HEAD(, spdk_nvmf_tcp_req)		state_queue[TCP_REQUEST_NUM_STATES];
+	/* Number of requests in each state */
+	uint32_t				state_cntr[TCP_REQUEST_NUM_STATES];
+
+	uint8_t					cpda;
+
+	bool					host_hdgst_enable;
+	bool					host_ddgst_enable;
+
+	/* IP address */
+	char					initiator_addr[SPDK_NVMF_TRADDR_MAX_LEN];
+	char					target_addr[SPDK_NVMF_TRADDR_MAX_LEN];
+
+	/* IP port */
+	uint16_t				initiator_port;
+	uint16_t				target_port;
+
+	/* Timer used to destroy qpair after detecting transport error issue if initiator does
+	 *  not close the connection.
+	 */
+	struct spdk_poller			*timeout_poller;
+
+	TAILQ_ENTRY(spdk_nvmf_tcp_qpair)	link;
+};
+
+struct spdk_nvmf_tcp_poll_group {
+	struct spdk_nvmf_transport_poll_group	group;
+	struct spdk_sock_group			*sock_group;
+
+	TAILQ_HEAD(, spdk_nvmf_tcp_qpair)	qpairs;
+	TAILQ_HEAD(, spdk_nvmf_tcp_qpair)	await_req;
+};
+
+struct spdk_nvmf_tcp_port {
+	const struct spdk_nvme_transport_id	*trid;
+	struct spdk_sock			*listen_sock;
+	TAILQ_ENTRY(spdk_nvmf_tcp_port)		link;
+};
+
+struct spdk_nvmf_tcp_transport {
+	struct spdk_nvmf_transport		transport;
+
+	pthread_mutex_t				lock;
+
+	TAILQ_HEAD(, spdk_nvmf_tcp_port)	ports;
+};
+
+static bool nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
+				 struct spdk_nvmf_tcp_req *tcp_req);
+
+static void
+nvmf_tcp_req_set_state(struct spdk_nvmf_tcp_req *tcp_req,
+		       enum spdk_nvmf_tcp_req_state state)
+{
+	struct spdk_nvmf_qpair *qpair;
+	struct spdk_nvmf_tcp_qpair *tqpair;
+
+	qpair = tcp_req->req.qpair;
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+
+	TAILQ_REMOVE(&tqpair->state_queue[tcp_req->state], tcp_req, state_link);
+	assert(tqpair->state_cntr[tcp_req->state] > 0);
+	tqpair->state_cntr[tcp_req->state]--;
+
+	TAILQ_INSERT_TAIL(&tqpair->state_queue[state], tcp_req, state_link);
+	tqpair->state_cntr[state]++;
+
+	tcp_req->state = state;
+}
+
+static inline struct nvme_tcp_pdu *
+nvmf_tcp_req_pdu_init(struct spdk_nvmf_tcp_req *tcp_req)
+{
+	assert(tcp_req->pdu_in_use == false);
+	tcp_req->pdu_in_use = true;
+
+	memset(tcp_req->pdu, 0, sizeof(*tcp_req->pdu));
+	tcp_req->pdu->qpair = SPDK_CONTAINEROF(tcp_req->req.qpair, struct spdk_nvmf_tcp_qpair, qpair);
+
+	return tcp_req->pdu;
+}
+
+static inline void
+nvmf_tcp_req_pdu_fini(struct spdk_nvmf_tcp_req *tcp_req)
+{
+	tcp_req->pdu_in_use = false;
+}
+
+static struct spdk_nvmf_tcp_req *
+nvmf_tcp_req_get(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	struct spdk_nvmf_tcp_req *tcp_req;
+
+	tcp_req = TAILQ_FIRST(&tqpair->state_queue[TCP_REQUEST_STATE_FREE]);
+	if (!tcp_req) {
+		return NULL;
+	}
+
+	memset(&tcp_req->rsp, 0, sizeof(tcp_req->rsp));
+	tcp_req->h2c_offset = 0;
+	tcp_req->has_incapsule_data = false;
+	tcp_req->req.dif.dif_insert_or_strip = false;
+
+	nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_NEW);
+	return tcp_req;
+}
+
+static void
+nvmf_tcp_request_free(struct spdk_nvmf_tcp_req *tcp_req)
+{
+	struct spdk_nvmf_tcp_transport *ttransport;
+
+	assert(tcp_req != NULL);
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tcp_req=%p will be freed\n", tcp_req);
+	ttransport = SPDK_CONTAINEROF(tcp_req->req.qpair->transport,
+				      struct spdk_nvmf_tcp_transport, transport);
+	nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_COMPLETED);
+	nvmf_tcp_req_process(ttransport, tcp_req);
+}
+
+static int
+nvmf_tcp_req_free(struct spdk_nvmf_request *req)
+{
+	struct spdk_nvmf_tcp_req *tcp_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_tcp_req, req);
+
+	nvmf_tcp_request_free(tcp_req);
+
+	return 0;
+}
+
+static void
+nvmf_tcp_drain_state_queue(struct spdk_nvmf_tcp_qpair *tqpair,
+			   enum spdk_nvmf_tcp_req_state state)
+{
+	struct spdk_nvmf_tcp_req *tcp_req, *req_tmp;
+
+	TAILQ_FOREACH_SAFE(tcp_req, &tqpair->state_queue[state], state_link, req_tmp) {
+		nvmf_tcp_request_free(tcp_req);
+	}
+}
+
+static void
+nvmf_tcp_cleanup_all_states(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	struct spdk_nvmf_tcp_req *tcp_req, *req_tmp;
+
+	assert(TAILQ_EMPTY(&tqpair->send_queue));
+
+	nvmf_tcp_drain_state_queue(tqpair, TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST);
+	nvmf_tcp_drain_state_queue(tqpair, TCP_REQUEST_STATE_NEW);
+
+	/* Wipe the requests waiting for buffer from the global list */
+	TAILQ_FOREACH_SAFE(tcp_req, &tqpair->state_queue[TCP_REQUEST_STATE_NEED_BUFFER], state_link,
+			   req_tmp) {
+		STAILQ_REMOVE(&tqpair->group->group.pending_buf_queue, &tcp_req->req,
+			      spdk_nvmf_request, buf_link);
+	}
+
+	nvmf_tcp_drain_state_queue(tqpair, TCP_REQUEST_STATE_NEED_BUFFER);
+	nvmf_tcp_drain_state_queue(tqpair, TCP_REQUEST_STATE_EXECUTING);
+	nvmf_tcp_drain_state_queue(tqpair, TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER);
+	nvmf_tcp_drain_state_queue(tqpair, TCP_REQUEST_STATE_AWAITING_R2T_ACK);
+}
+
+static void
+nvmf_tcp_dump_qpair_req_contents(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	int i;
+	struct spdk_nvmf_tcp_req *tcp_req;
+
+	SPDK_ERRLOG("Dumping contents of queue pair (QID %d)\n", tqpair->qpair.qid);
+	for (i = 1; i < TCP_REQUEST_NUM_STATES; i++) {
+		SPDK_ERRLOG("\tNum of requests in state[%d] = %u\n", i, tqpair->state_cntr[i]);
+		TAILQ_FOREACH(tcp_req, &tqpair->state_queue[i], state_link) {
+			SPDK_ERRLOG("\t\tRequest Data From Pool: %d\n", tcp_req->req.data_from_pool);
+			SPDK_ERRLOG("\t\tRequest opcode: %d\n", tcp_req->req.cmd->nvmf_cmd.opcode);
+		}
+	}
+}
+
+static void
+nvmf_tcp_qpair_destroy(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	int err = 0;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "enter\n");
+
+	err = spdk_sock_close(&tqpair->sock);
+	assert(err == 0);
+	nvmf_tcp_cleanup_all_states(tqpair);
+
+	if (tqpair->state_cntr[TCP_REQUEST_STATE_FREE] != tqpair->resource_count) {
+		SPDK_ERRLOG("tqpair(%p) free tcp request num is %u but should be %u\n", tqpair,
+			    tqpair->state_cntr[TCP_REQUEST_STATE_FREE],
+			    tqpair->resource_count);
+		err++;
+	}
+
+	if (err > 0) {
+		nvmf_tcp_dump_qpair_req_contents(tqpair);
+	}
+
+	spdk_dma_free(tqpair->pdus);
+	free(tqpair->reqs);
+	spdk_free(tqpair->bufs);
+	free(tqpair);
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Leave\n");
+}
+
+static int
+nvmf_tcp_destroy(struct spdk_nvmf_transport *transport)
+{
+	struct spdk_nvmf_tcp_transport	*ttransport;
+
+	assert(transport != NULL);
+	ttransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_tcp_transport, transport);
+
+	pthread_mutex_destroy(&ttransport->lock);
+	free(ttransport);
+	return 0;
+}
+
+static struct spdk_nvmf_transport *
+nvmf_tcp_create(struct spdk_nvmf_transport_opts *opts)
+{
+	struct spdk_nvmf_tcp_transport *ttransport;
+	uint32_t sge_count;
+	uint32_t min_shared_buffers;
+
+	ttransport = calloc(1, sizeof(*ttransport));
+	if (!ttransport) {
+		return NULL;
+	}
+
+	TAILQ_INIT(&ttransport->ports);
+
+	ttransport->transport.ops = &spdk_nvmf_transport_tcp;
+
+	SPDK_NOTICELOG("*** TCP Transport Init ***\n");
+
+	SPDK_INFOLOG(SPDK_LOG_NVMF_TCP, "*** TCP Transport Init ***\n"
+		     "  Transport opts:  max_ioq_depth=%d, max_io_size=%d,\n"
+		     "  max_io_qpairs_per_ctrlr=%d, io_unit_size=%d,\n"
+		     "  in_capsule_data_size=%d, max_aq_depth=%d\n"
+		     "  num_shared_buffers=%d, c2h_success=%d,\n"
+		     "  dif_insert_or_strip=%d, sock_priority=%d\n"
+		     "  abort_timeout_sec=%d\n",
+		     opts->max_queue_depth,
+		     opts->max_io_size,
+		     opts->max_qpairs_per_ctrlr - 1,
+		     opts->io_unit_size,
+		     opts->in_capsule_data_size,
+		     opts->max_aq_depth,
+		     opts->num_shared_buffers,
+		     opts->c2h_success,
+		     opts->dif_insert_or_strip,
+		     opts->sock_priority,
+		     opts->abort_timeout_sec);
+
+	if (opts->sock_priority > SPDK_NVMF_TCP_DEFAULT_MAX_SOCK_PRIORITY) {
+		SPDK_ERRLOG("Unsupported socket_priority=%d, the current range is: 0 to %d\n"
+			    "you can use man 7 socket to view the range of priority under SO_PRIORITY item\n",
+			    opts->sock_priority, SPDK_NVMF_TCP_DEFAULT_MAX_SOCK_PRIORITY);
+		free(ttransport);
+		return NULL;
+	}
+
+	/* I/O unit size cannot be larger than max I/O size */
+	if (opts->io_unit_size > opts->max_io_size) {
+		opts->io_unit_size = opts->max_io_size;
+	}
+
+	sge_count = opts->max_io_size / opts->io_unit_size;
+	if (sge_count > SPDK_NVMF_MAX_SGL_ENTRIES) {
+		SPDK_ERRLOG("Unsupported IO Unit size specified, %d bytes\n", opts->io_unit_size);
+		free(ttransport);
+		return NULL;
+	}
+
+	min_shared_buffers = spdk_thread_get_count() * opts->buf_cache_size;
+	if (min_shared_buffers > opts->num_shared_buffers) {
+		SPDK_ERRLOG("There are not enough buffers to satisfy"
+			    "per-poll group caches for each thread. (%" PRIu32 ")"
+			    "supplied. (%" PRIu32 ") required\n", opts->num_shared_buffers, min_shared_buffers);
+		SPDK_ERRLOG("Please specify a larger number of shared buffers\n");
+		nvmf_tcp_destroy(&ttransport->transport);
+		return NULL;
+	}
+
+	pthread_mutex_init(&ttransport->lock, NULL);
+
+	return &ttransport->transport;
+}
+
+static int
+nvmf_tcp_trsvcid_to_int(const char *trsvcid)
+{
+	unsigned long long ull;
+	char *end = NULL;
+
+	ull = strtoull(trsvcid, &end, 10);
+	if (end == NULL || end == trsvcid || *end != '\0') {
+		return -1;
+	}
+
+	/* Valid TCP/IP port numbers are in [0, 65535] */
+	if (ull > 65535) {
+		return -1;
+	}
+
+	return (int)ull;
+}
+
+/**
+ * Canonicalize a listen address trid.
+ */
+static int
+nvmf_tcp_canon_listen_trid(struct spdk_nvme_transport_id *canon_trid,
+			   const struct spdk_nvme_transport_id *trid)
+{
+	int trsvcid_int;
+
+	trsvcid_int = nvmf_tcp_trsvcid_to_int(trid->trsvcid);
+	if (trsvcid_int < 0) {
+		return -EINVAL;
+	}
+
+	memset(canon_trid, 0, sizeof(*canon_trid));
+	spdk_nvme_trid_populate_transport(canon_trid, SPDK_NVME_TRANSPORT_TCP);
+	canon_trid->adrfam = trid->adrfam;
+	snprintf(canon_trid->traddr, sizeof(canon_trid->traddr), "%s", trid->traddr);
+	snprintf(canon_trid->trsvcid, sizeof(canon_trid->trsvcid), "%d", trsvcid_int);
+
+	return 0;
+}
+
+/**
+ * Find an existing listening port.
+ *
+ * Caller must hold ttransport->lock.
+ */
+static struct spdk_nvmf_tcp_port *
+nvmf_tcp_find_port(struct spdk_nvmf_tcp_transport *ttransport,
+		   const struct spdk_nvme_transport_id *trid)
+{
+	struct spdk_nvme_transport_id canon_trid;
+	struct spdk_nvmf_tcp_port *port;
+
+	if (nvmf_tcp_canon_listen_trid(&canon_trid, trid) != 0) {
+		return NULL;
+	}
+
+	TAILQ_FOREACH(port, &ttransport->ports, link) {
+		if (spdk_nvme_transport_id_compare(&canon_trid, port->trid) == 0) {
+			return port;
+		}
+	}
+
+	return NULL;
+}
+
+static int
+nvmf_tcp_listen(struct spdk_nvmf_transport *transport,
+		const struct spdk_nvme_transport_id *trid)
+{
+	struct spdk_nvmf_tcp_transport *ttransport;
+	struct spdk_nvmf_tcp_port *port;
+	int trsvcid_int;
+	uint8_t adrfam;
+	struct spdk_sock_opts opts;
+
+	ttransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_tcp_transport, transport);
+
+	trsvcid_int = nvmf_tcp_trsvcid_to_int(trid->trsvcid);
+	if (trsvcid_int < 0) {
+		SPDK_ERRLOG("Invalid trsvcid '%s'\n", trid->trsvcid);
+		return -EINVAL;
+	}
+
+	pthread_mutex_lock(&ttransport->lock);
+	port = calloc(1, sizeof(*port));
+	if (!port) {
+		SPDK_ERRLOG("Port allocation failed\n");
+		pthread_mutex_unlock(&ttransport->lock);
+		return -ENOMEM;
+	}
+
+	port->trid = trid;
+	opts.opts_size = sizeof(opts);
+	spdk_sock_get_default_opts(&opts);
+	opts.priority = transport->opts.sock_priority;
+	port->listen_sock = spdk_sock_listen_ext(trid->traddr, trsvcid_int,
+			    NULL, &opts);
+	if (port->listen_sock == NULL) {
+		SPDK_ERRLOG("spdk_sock_listen(%s, %d) failed: %s (%d)\n",
+			    trid->traddr, trsvcid_int,
+			    spdk_strerror(errno), errno);
+		free(port);
+		pthread_mutex_unlock(&ttransport->lock);
+		return -errno;
+	}
+
+	if (spdk_sock_is_ipv4(port->listen_sock)) {
+		adrfam = SPDK_NVMF_ADRFAM_IPV4;
+	} else if (spdk_sock_is_ipv6(port->listen_sock)) {
+		adrfam = SPDK_NVMF_ADRFAM_IPV6;
+	} else {
+		SPDK_ERRLOG("Unhandled socket type\n");
+		adrfam = 0;
+	}
+
+	if (adrfam != trid->adrfam) {
+		SPDK_ERRLOG("Socket address family mismatch\n");
+		spdk_sock_close(&port->listen_sock);
+		free(port);
+		pthread_mutex_unlock(&ttransport->lock);
+		return -EINVAL;
+	}
+
+	SPDK_NOTICELOG("*** NVMe/TCP Target Listening on %s port %s ***\n",
+		       trid->traddr, trid->trsvcid);
+
+	TAILQ_INSERT_TAIL(&ttransport->ports, port, link);
+	pthread_mutex_unlock(&ttransport->lock);
+	return 0;
+}
+
+static void
+nvmf_tcp_stop_listen(struct spdk_nvmf_transport *transport,
+		     const struct spdk_nvme_transport_id *trid)
+{
+	struct spdk_nvmf_tcp_transport *ttransport;
+	struct spdk_nvmf_tcp_port *port;
+
+	ttransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_tcp_transport, transport);
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Removing listen address %s port %s\n",
+		      trid->traddr, trid->trsvcid);
+
+	pthread_mutex_lock(&ttransport->lock);
+	port = nvmf_tcp_find_port(ttransport, trid);
+	if (port) {
+		TAILQ_REMOVE(&ttransport->ports, port, link);
+		spdk_sock_close(&port->listen_sock);
+		free(port);
+	}
+
+	pthread_mutex_unlock(&ttransport->lock);
+}
+
+static void nvmf_tcp_qpair_set_recv_state(struct spdk_nvmf_tcp_qpair *tqpair,
+		enum nvme_tcp_pdu_recv_state state);
+
+static void
+nvmf_tcp_qpair_disconnect(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Disconnecting qpair %p\n", tqpair);
+
+	if (tqpair->state <= NVME_TCP_QPAIR_STATE_RUNNING) {
+		tqpair->state = NVME_TCP_QPAIR_STATE_EXITING;
+		nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_ERROR);
+		spdk_poller_unregister(&tqpair->timeout_poller);
+
+		/* This will end up calling nvmf_tcp_close_qpair */
+		spdk_nvmf_qpair_disconnect(&tqpair->qpair, NULL, NULL);
+	}
+}
+
+static void
+_pdu_write_done(void *_pdu, int err)
+{
+	struct nvme_tcp_pdu			*pdu = _pdu;
+	struct spdk_nvmf_tcp_qpair		*tqpair = pdu->qpair;
+
+	TAILQ_REMOVE(&tqpair->send_queue, pdu, tailq);
+
+	if (err != 0) {
+		nvmf_tcp_qpair_disconnect(tqpair);
+		return;
+	}
+
+	assert(pdu->cb_fn != NULL);
+	pdu->cb_fn(pdu->cb_arg);
+}
+
+static void
+nvmf_tcp_qpair_write_pdu(struct spdk_nvmf_tcp_qpair *tqpair,
+			 struct nvme_tcp_pdu *pdu,
+			 nvme_tcp_qpair_xfer_complete_cb cb_fn,
+			 void *cb_arg)
+{
+	int hlen;
+	uint32_t crc32c;
+	uint32_t mapped_length = 0;
+	ssize_t rc;
+
+	assert(&tqpair->pdu_in_progress != pdu);
+
+	hlen = pdu->hdr.common.hlen;
+
+	/* Header Digest */
+	if (g_nvme_tcp_hdgst[pdu->hdr.common.pdu_type] && tqpair->host_hdgst_enable) {
+		crc32c = nvme_tcp_pdu_calc_header_digest(pdu);
+		MAKE_DIGEST_WORD((uint8_t *)pdu->hdr.raw + hlen, crc32c);
+	}
+
+	/* Data Digest */
+	if (pdu->data_len > 0 && g_nvme_tcp_ddgst[pdu->hdr.common.pdu_type] && tqpair->host_ddgst_enable) {
+		crc32c = nvme_tcp_pdu_calc_data_digest(pdu);
+		MAKE_DIGEST_WORD(pdu->data_digest, crc32c);
+	}
+
+	pdu->cb_fn = cb_fn;
+	pdu->cb_arg = cb_arg;
+
+	pdu->sock_req.iovcnt = nvme_tcp_build_iovs(pdu->iov, SPDK_COUNTOF(pdu->iov), pdu,
+			       tqpair->host_hdgst_enable, tqpair->host_ddgst_enable,
+			       &mapped_length);
+	pdu->sock_req.cb_fn = _pdu_write_done;
+	pdu->sock_req.cb_arg = pdu;
+	TAILQ_INSERT_TAIL(&tqpair->send_queue, pdu, tailq);
+	if (pdu->hdr.common.pdu_type == SPDK_NVME_TCP_PDU_TYPE_IC_RESP ||
+	    pdu->hdr.common.pdu_type == SPDK_NVME_TCP_PDU_TYPE_C2H_TERM_REQ) {
+		rc = spdk_sock_writev(tqpair->sock, pdu->iov, pdu->sock_req.iovcnt);
+		if (rc == mapped_length) {
+			_pdu_write_done(pdu, 0);
+		} else {
+			SPDK_ERRLOG("IC_RESP or TERM_REQ could not write to socket.\n");
+			_pdu_write_done(pdu, -1);
+		}
+	} else {
+		spdk_sock_writev_async(tqpair->sock, &pdu->sock_req);
+	}
+}
+
+static int
+nvmf_tcp_qpair_init_mem_resource(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	uint32_t i;
+	struct spdk_nvmf_transport_opts *opts;
+	uint32_t in_capsule_data_size;
+
+	opts = &tqpair->qpair.transport->opts;
+
+	in_capsule_data_size = opts->in_capsule_data_size;
+	if (opts->dif_insert_or_strip) {
+		in_capsule_data_size = SPDK_BDEV_BUF_SIZE_WITH_MD(in_capsule_data_size);
+	}
+
+	tqpair->resource_count = opts->max_queue_depth;
+
+	tqpair->mgmt_pdu.qpair = tqpair;
+
+	tqpair->reqs = calloc(tqpair->resource_count, sizeof(*tqpair->reqs));
+	if (!tqpair->reqs) {
+		SPDK_ERRLOG("Unable to allocate reqs on tqpair=%p\n", tqpair);
+		return -1;
+	}
+
+	if (in_capsule_data_size) {
+		tqpair->bufs = spdk_zmalloc(tqpair->resource_count * in_capsule_data_size, 0x1000,
+					    NULL, SPDK_ENV_LCORE_ID_ANY,
+					    SPDK_MALLOC_DMA);
+		if (!tqpair->bufs) {
+			SPDK_ERRLOG("Unable to allocate bufs on tqpair=%p.\n", tqpair);
+			return -1;
+		}
+	}
+
+	tqpair->pdus = spdk_dma_malloc(tqpair->resource_count * sizeof(*tqpair->pdus), 0x1000, NULL);
+	if (!tqpair->pdus) {
+		SPDK_ERRLOG("Unable to allocate pdu pool on tqpair =%p.\n", tqpair);
+		return -1;
+	}
+
+	for (i = 0; i < tqpair->resource_count; i++) {
+		struct spdk_nvmf_tcp_req *tcp_req = &tqpair->reqs[i];
+
+		tcp_req->ttag = i + 1;
+		tcp_req->req.qpair = &tqpair->qpair;
+
+		tcp_req->pdu = &tqpair->pdus[i];
+		tcp_req->pdu->qpair = tqpair;
+
+		/* Set up memory to receive commands */
+		if (tqpair->bufs) {
+			tcp_req->buf = (void *)((uintptr_t)tqpair->bufs + (i * in_capsule_data_size));
+		}
+
+		/* Set the cmdn and rsp */
+		tcp_req->req.rsp = (union nvmf_c2h_msg *)&tcp_req->rsp;
+		tcp_req->req.cmd = (union nvmf_h2c_msg *)&tcp_req->cmd;
+
+		/* Initialize request state to FREE */
+		tcp_req->state = TCP_REQUEST_STATE_FREE;
+		TAILQ_INSERT_TAIL(&tqpair->state_queue[tcp_req->state], tcp_req, state_link);
+		tqpair->state_cntr[TCP_REQUEST_STATE_FREE]++;
+	}
+
+	tqpair->recv_buf_size = (in_capsule_data_size + sizeof(struct spdk_nvme_tcp_cmd) + 2 *
+				 SPDK_NVME_TCP_DIGEST_LEN) * SPDK_NVMF_TCP_RECV_BUF_SIZE_FACTOR;
+
+	return 0;
+}
+
+static int
+nvmf_tcp_qpair_init(struct spdk_nvmf_qpair *qpair)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair;
+	int i;
+
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "New TCP Connection: %p\n", qpair);
+
+	TAILQ_INIT(&tqpair->send_queue);
+
+	/* Initialise request state queues of the qpair */
+	for (i = TCP_REQUEST_STATE_FREE; i < TCP_REQUEST_NUM_STATES; i++) {
+		TAILQ_INIT(&tqpair->state_queue[i]);
+	}
+
+	tqpair->host_hdgst_enable = true;
+	tqpair->host_ddgst_enable = true;
+
+	return 0;
+}
+
+static int
+nvmf_tcp_qpair_sock_init(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	int rc;
+
+	/* set low water mark */
+	rc = spdk_sock_set_recvlowat(tqpair->sock, sizeof(struct spdk_nvme_tcp_common_pdu_hdr));
+	if (rc != 0) {
+		SPDK_ERRLOG("spdk_sock_set_recvlowat() failed\n");
+		return rc;
+	}
+
+	return 0;
+}
+
+static void
+nvmf_tcp_handle_connect(struct spdk_nvmf_transport *transport,
+			struct spdk_nvmf_tcp_port *port,
+			struct spdk_sock *sock)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair;
+	int rc;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "New connection accepted on %s port %s\n",
+		      port->trid->traddr, port->trid->trsvcid);
+
+	tqpair = calloc(1, sizeof(struct spdk_nvmf_tcp_qpair));
+	if (tqpair == NULL) {
+		SPDK_ERRLOG("Could not allocate new connection.\n");
+		spdk_sock_close(&sock);
+		return;
+	}
+
+	tqpair->sock = sock;
+	tqpair->state_cntr[TCP_REQUEST_STATE_FREE] = 0;
+	tqpair->port = port;
+	tqpair->qpair.transport = transport;
+
+	rc = spdk_sock_getaddr(tqpair->sock, tqpair->target_addr,
+			       sizeof(tqpair->target_addr), &tqpair->target_port,
+			       tqpair->initiator_addr, sizeof(tqpair->initiator_addr),
+			       &tqpair->initiator_port);
+	if (rc < 0) {
+		SPDK_ERRLOG("spdk_sock_getaddr() failed of tqpair=%p\n", tqpair);
+		nvmf_tcp_qpair_destroy(tqpair);
+		return;
+	}
+
+	spdk_nvmf_tgt_new_qpair(transport->tgt, &tqpair->qpair);
+}
+
+static uint32_t
+nvmf_tcp_port_accept(struct spdk_nvmf_transport *transport, struct spdk_nvmf_tcp_port *port)
+{
+	struct spdk_sock *sock;
+	uint32_t count = 0;
+	int i;
+
+	for (i = 0; i < NVMF_TCP_MAX_ACCEPT_SOCK_ONE_TIME; i++) {
+		sock = spdk_sock_accept(port->listen_sock);
+		if (sock == NULL) {
+			break;
+		}
+		count++;
+		nvmf_tcp_handle_connect(transport, port, sock);
+	}
+
+	return count;
+}
+
+static uint32_t
+nvmf_tcp_accept(struct spdk_nvmf_transport *transport)
+{
+	struct spdk_nvmf_tcp_transport *ttransport;
+	struct spdk_nvmf_tcp_port *port;
+	uint32_t count = 0;
+
+	ttransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_tcp_transport, transport);
+
+	TAILQ_FOREACH(port, &ttransport->ports, link) {
+		count += nvmf_tcp_port_accept(transport, port);
+	}
+
+	return count;
+}
+
+static void
+nvmf_tcp_discover(struct spdk_nvmf_transport *transport,
+		  struct spdk_nvme_transport_id *trid,
+		  struct spdk_nvmf_discovery_log_page_entry *entry)
+{
+	entry->trtype = SPDK_NVMF_TRTYPE_TCP;
+	entry->adrfam = trid->adrfam;
+	entry->treq.secure_channel = SPDK_NVMF_TREQ_SECURE_CHANNEL_NOT_REQUIRED;
+
+	spdk_strcpy_pad(entry->trsvcid, trid->trsvcid, sizeof(entry->trsvcid), ' ');
+	spdk_strcpy_pad(entry->traddr, trid->traddr, sizeof(entry->traddr), ' ');
+
+	entry->tsas.tcp.sectype = SPDK_NVME_TCP_SECURITY_NONE;
+}
+
+static struct spdk_nvmf_transport_poll_group *
+nvmf_tcp_poll_group_create(struct spdk_nvmf_transport *transport)
+{
+	struct spdk_nvmf_tcp_poll_group *tgroup;
+
+	tgroup = calloc(1, sizeof(*tgroup));
+	if (!tgroup) {
+		return NULL;
+	}
+
+	tgroup->sock_group = spdk_sock_group_create(&tgroup->group);
+	if (!tgroup->sock_group) {
+		goto cleanup;
+	}
+
+	TAILQ_INIT(&tgroup->qpairs);
+	TAILQ_INIT(&tgroup->await_req);
+
+	return &tgroup->group;
+
+cleanup:
+	free(tgroup);
+	return NULL;
+}
+
+static struct spdk_nvmf_transport_poll_group *
+nvmf_tcp_get_optimal_poll_group(struct spdk_nvmf_qpair *qpair)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair;
+	struct spdk_sock_group *group = NULL;
+	int rc;
+
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+	rc = spdk_sock_get_optimal_sock_group(tqpair->sock, &group);
+	if (!rc && group != NULL) {
+		return spdk_sock_group_get_ctx(group);
+	}
+
+	return NULL;
+}
+
+static void
+nvmf_tcp_poll_group_destroy(struct spdk_nvmf_transport_poll_group *group)
+{
+	struct spdk_nvmf_tcp_poll_group *tgroup;
+
+	tgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_tcp_poll_group, group);
+	spdk_sock_group_close(&tgroup->sock_group);
+
+	free(tgroup);
+}
+
+static void
+nvmf_tcp_qpair_set_recv_state(struct spdk_nvmf_tcp_qpair *tqpair,
+			      enum nvme_tcp_pdu_recv_state state)
+{
+	if (tqpair->recv_state == state) {
+		SPDK_ERRLOG("The recv state of tqpair=%p is same with the state(%d) to be set\n",
+			    tqpair, state);
+		return;
+	}
+
+	if (tqpair->recv_state == NVME_TCP_PDU_RECV_STATE_AWAIT_REQ) {
+		/* When leaving the await req state, move the qpair to the main list */
+		TAILQ_REMOVE(&tqpair->group->await_req, tqpair, link);
+		TAILQ_INSERT_TAIL(&tqpair->group->qpairs, tqpair, link);
+	}
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tqpair(%p) recv state=%d\n", tqpair, state);
+	tqpair->recv_state = state;
+
+	switch (state) {
+	case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH:
+	case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PSH:
+	case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD:
+		break;
+	case NVME_TCP_PDU_RECV_STATE_AWAIT_REQ:
+		TAILQ_REMOVE(&tqpair->group->qpairs, tqpair, link);
+		TAILQ_INSERT_TAIL(&tqpair->group->await_req, tqpair, link);
+		break;
+	case NVME_TCP_PDU_RECV_STATE_ERROR:
+	case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY:
+		memset(&tqpair->pdu_in_progress, 0, sizeof(tqpair->pdu_in_progress));
+		break;
+	default:
+		SPDK_ERRLOG("The state(%d) is invalid\n", state);
+		abort();
+		break;
+	}
+}
+
+static int
+nvmf_tcp_qpair_handle_timeout(void *ctx)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair = ctx;
+
+	assert(tqpair->recv_state == NVME_TCP_PDU_RECV_STATE_ERROR);
+
+	SPDK_ERRLOG("No pdu coming for tqpair=%p within %d seconds\n", tqpair,
+		    SPDK_NVME_TCP_QPAIR_EXIT_TIMEOUT);
+
+	nvmf_tcp_qpair_disconnect(tqpair);
+	return SPDK_POLLER_BUSY;
+}
+
+static void
+nvmf_tcp_send_c2h_term_req_complete(void *cb_arg)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair = (struct spdk_nvmf_tcp_qpair *)cb_arg;
+
+	if (!tqpair->timeout_poller) {
+		tqpair->timeout_poller = SPDK_POLLER_REGISTER(nvmf_tcp_qpair_handle_timeout, tqpair,
+					 SPDK_NVME_TCP_QPAIR_EXIT_TIMEOUT * 1000000);
+	}
+}
+
+static void
+nvmf_tcp_send_c2h_term_req(struct spdk_nvmf_tcp_qpair *tqpair, struct nvme_tcp_pdu *pdu,
+			   enum spdk_nvme_tcp_term_req_fes fes, uint32_t error_offset)
+{
+	struct nvme_tcp_pdu *rsp_pdu;
+	struct spdk_nvme_tcp_term_req_hdr *c2h_term_req;
+	uint32_t c2h_term_req_hdr_len = sizeof(*c2h_term_req);
+	uint32_t copy_len;
+
+	rsp_pdu = &tqpair->mgmt_pdu;
+
+	c2h_term_req = &rsp_pdu->hdr.term_req;
+	c2h_term_req->common.pdu_type = SPDK_NVME_TCP_PDU_TYPE_C2H_TERM_REQ;
+	c2h_term_req->common.hlen = c2h_term_req_hdr_len;
+
+	if ((fes == SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD) ||
+	    (fes == SPDK_NVME_TCP_TERM_REQ_FES_INVALID_DATA_UNSUPPORTED_PARAMETER)) {
+		DSET32(&c2h_term_req->fei, error_offset);
+	}
+
+	copy_len = spdk_min(pdu->hdr.common.hlen, SPDK_NVME_TCP_TERM_REQ_ERROR_DATA_MAX_SIZE);
+
+	/* Copy the error info into the buffer */
+	memcpy((uint8_t *)rsp_pdu->hdr.raw + c2h_term_req_hdr_len, pdu->hdr.raw, copy_len);
+	nvme_tcp_pdu_set_data(rsp_pdu, (uint8_t *)rsp_pdu->hdr.raw + c2h_term_req_hdr_len, copy_len);
+
+	/* Contain the header of the wrong received pdu */
+	c2h_term_req->common.plen = c2h_term_req->common.hlen + copy_len;
+	nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_ERROR);
+	nvmf_tcp_qpair_write_pdu(tqpair, rsp_pdu, nvmf_tcp_send_c2h_term_req_complete, tqpair);
+}
+
+static void
+nvmf_tcp_capsule_cmd_hdr_handle(struct spdk_nvmf_tcp_transport *ttransport,
+				struct spdk_nvmf_tcp_qpair *tqpair,
+				struct nvme_tcp_pdu *pdu)
+{
+	struct spdk_nvmf_tcp_req *tcp_req;
+
+	assert(pdu->psh_valid_bytes == pdu->psh_len);
+	assert(pdu->hdr.common.pdu_type == SPDK_NVME_TCP_PDU_TYPE_CAPSULE_CMD);
+
+	tcp_req = nvmf_tcp_req_get(tqpair);
+	if (!tcp_req) {
+		/* Directly return and make the allocation retry again */
+		if (tqpair->state_cntr[TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST] > 0) {
+			return;
+		}
+
+		/* The host sent more commands than the maximum queue depth. */
+		SPDK_ERRLOG("Cannot allocate tcp_req on tqpair=%p\n", tqpair);
+		nvmf_tcp_qpair_disconnect(tqpair);
+		return;
+	}
+
+	pdu->req = tcp_req;
+	assert(tcp_req->state == TCP_REQUEST_STATE_NEW);
+	nvmf_tcp_req_process(ttransport, tcp_req);
+}
+
+static void
+nvmf_tcp_capsule_cmd_payload_handle(struct spdk_nvmf_tcp_transport *ttransport,
+				    struct spdk_nvmf_tcp_qpair *tqpair,
+				    struct nvme_tcp_pdu *pdu)
+{
+	struct spdk_nvmf_tcp_req *tcp_req;
+	struct spdk_nvme_tcp_cmd *capsule_cmd;
+	uint32_t error_offset = 0;
+	enum spdk_nvme_tcp_term_req_fes fes;
+
+	capsule_cmd = &pdu->hdr.capsule_cmd;
+	tcp_req = pdu->req;
+	assert(tcp_req != NULL);
+	if (capsule_cmd->common.pdo > SPDK_NVME_TCP_PDU_PDO_MAX_OFFSET) {
+		SPDK_ERRLOG("Expected ICReq capsule_cmd pdu offset <= %d, got %c\n",
+			    SPDK_NVME_TCP_PDU_PDO_MAX_OFFSET, capsule_cmd->common.pdo);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+		error_offset = offsetof(struct spdk_nvme_tcp_common_pdu_hdr, pdo);
+		goto err;
+	}
+
+	nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
+	nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_EXECUTE);
+	nvmf_tcp_req_process(ttransport, tcp_req);
+
+	return;
+err:
+	nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+}
+
+static int
+nvmf_tcp_find_req_in_state(struct spdk_nvmf_tcp_qpair *tqpair,
+			   enum spdk_nvmf_tcp_req_state state,
+			   uint16_t cid, uint16_t tag,
+			   struct spdk_nvmf_tcp_req **req)
+{
+	struct spdk_nvmf_tcp_req *tcp_req = NULL;
+
+	TAILQ_FOREACH(tcp_req, &tqpair->state_queue[state], state_link) {
+		if (tcp_req->req.cmd->nvme_cmd.cid != cid) {
+			continue;
+		}
+
+		if (tcp_req->ttag == tag) {
+			*req = tcp_req;
+			return 0;
+		}
+
+		*req = NULL;
+		return -1;
+	}
+
+	/* Didn't find it, but not an error */
+	*req = NULL;
+	return 0;
+}
+
+static void
+nvmf_tcp_h2c_data_hdr_handle(struct spdk_nvmf_tcp_transport *ttransport,
+			     struct spdk_nvmf_tcp_qpair *tqpair,
+			     struct nvme_tcp_pdu *pdu)
+{
+	struct spdk_nvmf_tcp_req *tcp_req;
+	uint32_t error_offset = 0;
+	enum spdk_nvme_tcp_term_req_fes fes = 0;
+	struct spdk_nvme_tcp_h2c_data_hdr *h2c_data;
+	int rc;
+
+	h2c_data = &pdu->hdr.h2c_data;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tqpair=%p, r2t_info: datao=%u, datal=%u, cccid=%u, ttag=%u\n",
+		      tqpair, h2c_data->datao, h2c_data->datal, h2c_data->cccid, h2c_data->ttag);
+
+	rc = nvmf_tcp_find_req_in_state(tqpair, TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER,
+					h2c_data->cccid, h2c_data->ttag, &tcp_req);
+	if (rc == 0 && tcp_req == NULL) {
+		rc = nvmf_tcp_find_req_in_state(tqpair, TCP_REQUEST_STATE_AWAITING_R2T_ACK, h2c_data->cccid,
+						h2c_data->ttag, &tcp_req);
+	}
+
+	if (!tcp_req) {
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tcp_req is not found for tqpair=%p\n", tqpair);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_DATA_UNSUPPORTED_PARAMETER;
+		if (rc == 0) {
+			error_offset = offsetof(struct spdk_nvme_tcp_h2c_data_hdr, cccid);
+		} else {
+			error_offset = offsetof(struct spdk_nvme_tcp_h2c_data_hdr, ttag);
+		}
+		goto err;
+	}
+
+	if (tcp_req->h2c_offset != h2c_data->datao) {
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP,
+			      "tcp_req(%p), tqpair=%p, expected data offset %u, but data offset is %u\n",
+			      tcp_req, tqpair, tcp_req->h2c_offset, h2c_data->datao);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_DATA_TRANSFER_OUT_OF_RANGE;
+		goto err;
+	}
+
+	if ((h2c_data->datao + h2c_data->datal) > tcp_req->req.length) {
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP,
+			      "tcp_req(%p), tqpair=%p,  (datao=%u + datal=%u) execeeds requested length=%u\n",
+			      tcp_req, tqpair, h2c_data->datao, h2c_data->datal, tcp_req->req.length);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_DATA_TRANSFER_OUT_OF_RANGE;
+		goto err;
+	}
+
+	pdu->req = tcp_req;
+
+	if (spdk_unlikely(tcp_req->req.dif.dif_insert_or_strip)) {
+		pdu->dif_ctx = &tcp_req->req.dif.dif_ctx;
+	}
+
+	nvme_tcp_pdu_set_data_buf(pdu, tcp_req->req.iov, tcp_req->req.iovcnt,
+				  h2c_data->datao, h2c_data->datal);
+	nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD);
+	return;
+
+err:
+	nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+}
+
+static void
+nvmf_tcp_pdu_cmd_complete(void *cb_arg)
+{
+	struct spdk_nvmf_tcp_req *tcp_req = cb_arg;
+	nvmf_tcp_request_free(tcp_req);
+}
+
+static void
+nvmf_tcp_send_capsule_resp_pdu(struct spdk_nvmf_tcp_req *tcp_req,
+			       struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	struct nvme_tcp_pdu *rsp_pdu;
+	struct spdk_nvme_tcp_rsp *capsule_resp;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "enter, tqpair=%p\n", tqpair);
+
+	rsp_pdu = nvmf_tcp_req_pdu_init(tcp_req);
+	assert(rsp_pdu != NULL);
+
+	capsule_resp = &rsp_pdu->hdr.capsule_resp;
+	capsule_resp->common.pdu_type = SPDK_NVME_TCP_PDU_TYPE_CAPSULE_RESP;
+	capsule_resp->common.plen = capsule_resp->common.hlen = sizeof(*capsule_resp);
+	capsule_resp->rccqe = tcp_req->req.rsp->nvme_cpl;
+	if (tqpair->host_hdgst_enable) {
+		capsule_resp->common.flags |= SPDK_NVME_TCP_CH_FLAGS_HDGSTF;
+		capsule_resp->common.plen += SPDK_NVME_TCP_DIGEST_LEN;
+	}
+
+	nvmf_tcp_qpair_write_pdu(tqpair, rsp_pdu, nvmf_tcp_pdu_cmd_complete, tcp_req);
+}
+
+static void
+nvmf_tcp_pdu_c2h_data_complete(void *cb_arg)
+{
+	struct spdk_nvmf_tcp_req *tcp_req = cb_arg;
+	struct spdk_nvmf_tcp_qpair *tqpair = SPDK_CONTAINEROF(tcp_req->req.qpair,
+					     struct spdk_nvmf_tcp_qpair, qpair);
+
+	assert(tqpair != NULL);
+	if (tqpair->qpair.transport->opts.c2h_success) {
+		nvmf_tcp_request_free(tcp_req);
+	} else {
+		nvmf_tcp_req_pdu_fini(tcp_req);
+		nvmf_tcp_send_capsule_resp_pdu(tcp_req, tqpair);
+	}
+}
+
+static void
+nvmf_tcp_r2t_complete(void *cb_arg)
+{
+	struct spdk_nvmf_tcp_req *tcp_req = cb_arg;
+	struct spdk_nvmf_tcp_transport *ttransport;
+
+	nvmf_tcp_req_pdu_fini(tcp_req);
+
+	ttransport = SPDK_CONTAINEROF(tcp_req->req.qpair->transport,
+				      struct spdk_nvmf_tcp_transport, transport);
+
+	nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER);
+
+	if (tcp_req->h2c_offset == tcp_req->req.length) {
+		nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_EXECUTE);
+		nvmf_tcp_req_process(ttransport, tcp_req);
+	}
+}
+
+static void
+nvmf_tcp_send_r2t_pdu(struct spdk_nvmf_tcp_qpair *tqpair,
+		      struct spdk_nvmf_tcp_req *tcp_req)
+{
+	struct nvme_tcp_pdu *rsp_pdu;
+	struct spdk_nvme_tcp_r2t_hdr *r2t;
+
+	rsp_pdu = nvmf_tcp_req_pdu_init(tcp_req);
+	assert(rsp_pdu != NULL);
+
+	r2t = &rsp_pdu->hdr.r2t;
+	r2t->common.pdu_type = SPDK_NVME_TCP_PDU_TYPE_R2T;
+	r2t->common.plen = r2t->common.hlen = sizeof(*r2t);
+
+	if (tqpair->host_hdgst_enable) {
+		r2t->common.flags |= SPDK_NVME_TCP_CH_FLAGS_HDGSTF;
+		r2t->common.plen += SPDK_NVME_TCP_DIGEST_LEN;
+	}
+
+	r2t->cccid = tcp_req->req.cmd->nvme_cmd.cid;
+	r2t->ttag = tcp_req->ttag;
+	r2t->r2to = tcp_req->h2c_offset;
+	r2t->r2tl = tcp_req->req.length;
+
+	nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_AWAITING_R2T_ACK);
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP,
+		      "tcp_req(%p) on tqpair(%p), r2t_info: cccid=%u, ttag=%u, r2to=%u, r2tl=%u\n",
+		      tcp_req, tqpair, r2t->cccid, r2t->ttag, r2t->r2to, r2t->r2tl);
+	nvmf_tcp_qpair_write_pdu(tqpair, rsp_pdu, nvmf_tcp_r2t_complete, tcp_req);
+}
+
+static void
+nvmf_tcp_h2c_data_payload_handle(struct spdk_nvmf_tcp_transport *ttransport,
+				 struct spdk_nvmf_tcp_qpair *tqpair,
+				 struct nvme_tcp_pdu *pdu)
+{
+	struct spdk_nvmf_tcp_req *tcp_req;
+
+	tcp_req = pdu->req;
+	assert(tcp_req != NULL);
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "enter\n");
+
+	tcp_req->h2c_offset += pdu->data_len;
+
+	nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
+
+	/* Wait for all of the data to arrive AND for the initial R2T PDU send to be
+	 * acknowledged before moving on. */
+	if (tcp_req->h2c_offset == tcp_req->req.length &&
+	    tcp_req->state == TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER) {
+		nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_EXECUTE);
+		nvmf_tcp_req_process(ttransport, tcp_req);
+	}
+}
+
+static void
+nvmf_tcp_h2c_term_req_dump(struct spdk_nvme_tcp_term_req_hdr *h2c_term_req)
+{
+	SPDK_ERRLOG("Error info of pdu(%p): %s\n", h2c_term_req,
+		    spdk_nvmf_tcp_term_req_fes_str[h2c_term_req->fes]);
+	if ((h2c_term_req->fes == SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD) ||
+	    (h2c_term_req->fes == SPDK_NVME_TCP_TERM_REQ_FES_INVALID_DATA_UNSUPPORTED_PARAMETER)) {
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "The offset from the start of the PDU header is %u\n",
+			      DGET32(h2c_term_req->fei));
+	}
+}
+
+static void
+nvmf_tcp_h2c_term_req_hdr_handle(struct spdk_nvmf_tcp_qpair *tqpair,
+				 struct nvme_tcp_pdu *pdu)
+{
+	struct spdk_nvme_tcp_term_req_hdr *h2c_term_req = &pdu->hdr.term_req;
+	uint32_t error_offset = 0;
+	enum spdk_nvme_tcp_term_req_fes fes;
+
+
+	if (h2c_term_req->fes > SPDK_NVME_TCP_TERM_REQ_FES_INVALID_DATA_UNSUPPORTED_PARAMETER) {
+		SPDK_ERRLOG("Fatal Error Stauts(FES) is unknown for h2c_term_req pdu=%p\n", pdu);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+		error_offset = offsetof(struct spdk_nvme_tcp_term_req_hdr, fes);
+		goto end;
+	}
+
+	/* set the data buffer */
+	nvme_tcp_pdu_set_data(pdu, (uint8_t *)pdu->hdr.raw + h2c_term_req->common.hlen,
+			      h2c_term_req->common.plen - h2c_term_req->common.hlen);
+	nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD);
+	return;
+end:
+	nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+}
+
+static void
+nvmf_tcp_h2c_term_req_payload_handle(struct spdk_nvmf_tcp_qpair *tqpair,
+				     struct nvme_tcp_pdu *pdu)
+{
+	struct spdk_nvme_tcp_term_req_hdr *h2c_term_req = &pdu->hdr.term_req;
+
+	nvmf_tcp_h2c_term_req_dump(h2c_term_req);
+	nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_ERROR);
+}
+
+static void
+nvmf_tcp_pdu_payload_handle(struct spdk_nvmf_tcp_qpair *tqpair,
+			    struct spdk_nvmf_tcp_transport *ttransport)
+{
+	int rc = 0;
+	struct nvme_tcp_pdu *pdu;
+	uint32_t crc32c, error_offset = 0;
+	enum spdk_nvme_tcp_term_req_fes fes;
+
+	assert(tqpair->recv_state == NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD);
+	pdu = &tqpair->pdu_in_progress;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "enter\n");
+	/* check data digest if need */
+	if (pdu->ddgst_enable) {
+		crc32c = nvme_tcp_pdu_calc_data_digest(pdu);
+		rc = MATCH_DIGEST_WORD(pdu->data_digest, crc32c);
+		if (rc == 0) {
+			SPDK_ERRLOG("Data digest error on tqpair=(%p) with pdu=%p\n", tqpair, pdu);
+			fes = SPDK_NVME_TCP_TERM_REQ_FES_HDGST_ERROR;
+			nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+			return;
+
+		}
+	}
+
+	switch (pdu->hdr.common.pdu_type) {
+	case SPDK_NVME_TCP_PDU_TYPE_CAPSULE_CMD:
+		nvmf_tcp_capsule_cmd_payload_handle(ttransport, tqpair, pdu);
+		break;
+	case SPDK_NVME_TCP_PDU_TYPE_H2C_DATA:
+		nvmf_tcp_h2c_data_payload_handle(ttransport, tqpair, pdu);
+		break;
+
+	case SPDK_NVME_TCP_PDU_TYPE_H2C_TERM_REQ:
+		nvmf_tcp_h2c_term_req_payload_handle(tqpair, pdu);
+		break;
+
+	default:
+		/* The code should not go to here */
+		SPDK_ERRLOG("The code should not go to here\n");
+		break;
+	}
+}
+
+static void
+nvmf_tcp_send_icresp_complete(void *cb_arg)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair = cb_arg;
+
+	tqpair->state = NVME_TCP_QPAIR_STATE_RUNNING;
+}
+
+static void
+nvmf_tcp_icreq_handle(struct spdk_nvmf_tcp_transport *ttransport,
+		      struct spdk_nvmf_tcp_qpair *tqpair,
+		      struct nvme_tcp_pdu *pdu)
+{
+	struct spdk_nvme_tcp_ic_req *ic_req = &pdu->hdr.ic_req;
+	struct nvme_tcp_pdu *rsp_pdu;
+	struct spdk_nvme_tcp_ic_resp *ic_resp;
+	uint32_t error_offset = 0;
+	enum spdk_nvme_tcp_term_req_fes fes;
+
+	/* Only PFV 0 is defined currently */
+	if (ic_req->pfv != 0) {
+		SPDK_ERRLOG("Expected ICReq PFV %u, got %u\n", 0u, ic_req->pfv);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+		error_offset = offsetof(struct spdk_nvme_tcp_ic_req, pfv);
+		goto end;
+	}
+
+	/* MAXR2T is 0's based */
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "maxr2t =%u\n", (ic_req->maxr2t + 1u));
+
+	tqpair->host_hdgst_enable = ic_req->dgst.bits.hdgst_enable ? true : false;
+	if (!tqpair->host_hdgst_enable) {
+		tqpair->recv_buf_size -= SPDK_NVME_TCP_DIGEST_LEN * SPDK_NVMF_TCP_RECV_BUF_SIZE_FACTOR;
+	}
+
+	tqpair->host_ddgst_enable = ic_req->dgst.bits.ddgst_enable ? true : false;
+	if (!tqpair->host_ddgst_enable) {
+		tqpair->recv_buf_size -= SPDK_NVME_TCP_DIGEST_LEN * SPDK_NVMF_TCP_RECV_BUF_SIZE_FACTOR;
+	}
+
+	/* Now that we know whether digests are enabled, properly size the receive buffer */
+	if (spdk_sock_set_recvbuf(tqpair->sock, tqpair->recv_buf_size) < 0) {
+		SPDK_WARNLOG("Unable to allocate enough memory for receive buffer on tqpair=%p with size=%d\n",
+			     tqpair,
+			     tqpair->recv_buf_size);
+		/* Not fatal. */
+	}
+
+	tqpair->cpda = spdk_min(ic_req->hpda, SPDK_NVME_TCP_CPDA_MAX);
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "cpda of tqpair=(%p) is : %u\n", tqpair, tqpair->cpda);
+
+	rsp_pdu = &tqpair->mgmt_pdu;
+
+	ic_resp = &rsp_pdu->hdr.ic_resp;
+	ic_resp->common.pdu_type = SPDK_NVME_TCP_PDU_TYPE_IC_RESP;
+	ic_resp->common.hlen = ic_resp->common.plen =  sizeof(*ic_resp);
+	ic_resp->pfv = 0;
+	ic_resp->cpda = tqpair->cpda;
+	ic_resp->maxh2cdata = ttransport->transport.opts.max_io_size;
+	ic_resp->dgst.bits.hdgst_enable = tqpair->host_hdgst_enable ? 1 : 0;
+	ic_resp->dgst.bits.ddgst_enable = tqpair->host_ddgst_enable ? 1 : 0;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "host_hdgst_enable: %u\n", tqpair->host_hdgst_enable);
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "host_ddgst_enable: %u\n", tqpair->host_ddgst_enable);
+
+	tqpair->state = NVME_TCP_QPAIR_STATE_INITIALIZING;
+	nvmf_tcp_qpair_write_pdu(tqpair, rsp_pdu, nvmf_tcp_send_icresp_complete, tqpair);
+	nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
+	return;
+end:
+	nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+}
+
+static void
+nvmf_tcp_pdu_psh_handle(struct spdk_nvmf_tcp_qpair *tqpair,
+			struct spdk_nvmf_tcp_transport *ttransport)
+{
+	struct nvme_tcp_pdu *pdu;
+	int rc;
+	uint32_t crc32c, error_offset = 0;
+	enum spdk_nvme_tcp_term_req_fes fes;
+
+	assert(tqpair->recv_state == NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PSH);
+	pdu = &tqpair->pdu_in_progress;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "pdu type of tqpair(%p) is %d\n", tqpair,
+		      pdu->hdr.common.pdu_type);
+	/* check header digest if needed */
+	if (pdu->has_hdgst) {
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Compare the header of pdu=%p on tqpair=%p\n", pdu, tqpair);
+		crc32c = nvme_tcp_pdu_calc_header_digest(pdu);
+		rc = MATCH_DIGEST_WORD((uint8_t *)pdu->hdr.raw + pdu->hdr.common.hlen, crc32c);
+		if (rc == 0) {
+			SPDK_ERRLOG("Header digest error on tqpair=(%p) with pdu=%p\n", tqpair, pdu);
+			fes = SPDK_NVME_TCP_TERM_REQ_FES_HDGST_ERROR;
+			nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+			return;
+
+		}
+	}
+
+	switch (pdu->hdr.common.pdu_type) {
+	case SPDK_NVME_TCP_PDU_TYPE_IC_REQ:
+		nvmf_tcp_icreq_handle(ttransport, tqpair, pdu);
+		break;
+	case SPDK_NVME_TCP_PDU_TYPE_CAPSULE_CMD:
+		nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_REQ);
+		break;
+	case SPDK_NVME_TCP_PDU_TYPE_H2C_DATA:
+		nvmf_tcp_h2c_data_hdr_handle(ttransport, tqpair, pdu);
+		break;
+
+	case SPDK_NVME_TCP_PDU_TYPE_H2C_TERM_REQ:
+		nvmf_tcp_h2c_term_req_hdr_handle(tqpair, pdu);
+		break;
+
+	default:
+		SPDK_ERRLOG("Unexpected PDU type 0x%02x\n", tqpair->pdu_in_progress.hdr.common.pdu_type);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+		error_offset = 1;
+		nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+		break;
+	}
+}
+
+static void
+nvmf_tcp_pdu_ch_handle(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	struct nvme_tcp_pdu *pdu;
+	uint32_t error_offset = 0;
+	enum spdk_nvme_tcp_term_req_fes fes;
+	uint8_t expected_hlen, pdo;
+	bool plen_error = false, pdo_error = false;
+
+	assert(tqpair->recv_state == NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH);
+	pdu = &tqpair->pdu_in_progress;
+
+	if (pdu->hdr.common.pdu_type == SPDK_NVME_TCP_PDU_TYPE_IC_REQ) {
+		if (tqpair->state != NVME_TCP_QPAIR_STATE_INVALID) {
+			SPDK_ERRLOG("Already received ICreq PDU, and reject this pdu=%p\n", pdu);
+			fes = SPDK_NVME_TCP_TERM_REQ_FES_PDU_SEQUENCE_ERROR;
+			goto err;
+		}
+		expected_hlen = sizeof(struct spdk_nvme_tcp_ic_req);
+		if (pdu->hdr.common.plen != expected_hlen) {
+			plen_error = true;
+		}
+	} else {
+		if (tqpair->state != NVME_TCP_QPAIR_STATE_RUNNING) {
+			SPDK_ERRLOG("The TCP/IP connection is not negotitated\n");
+			fes = SPDK_NVME_TCP_TERM_REQ_FES_PDU_SEQUENCE_ERROR;
+			goto err;
+		}
+
+		switch (pdu->hdr.common.pdu_type) {
+		case SPDK_NVME_TCP_PDU_TYPE_CAPSULE_CMD:
+			expected_hlen = sizeof(struct spdk_nvme_tcp_cmd);
+			pdo = pdu->hdr.common.pdo;
+			if ((tqpair->cpda != 0) && (pdo != ((tqpair->cpda + 1) << 2))) {
+				pdo_error = true;
+				break;
+			}
+
+			if (pdu->hdr.common.plen < expected_hlen) {
+				plen_error = true;
+			}
+			break;
+		case SPDK_NVME_TCP_PDU_TYPE_H2C_DATA:
+			expected_hlen = sizeof(struct spdk_nvme_tcp_h2c_data_hdr);
+			pdo = pdu->hdr.common.pdo;
+			if ((tqpair->cpda != 0) && (pdo != ((tqpair->cpda + 1) << 2))) {
+				pdo_error = true;
+				break;
+			}
+			if (pdu->hdr.common.plen < expected_hlen) {
+				plen_error = true;
+			}
+			break;
+
+		case SPDK_NVME_TCP_PDU_TYPE_H2C_TERM_REQ:
+			expected_hlen = sizeof(struct spdk_nvme_tcp_term_req_hdr);
+			if ((pdu->hdr.common.plen <= expected_hlen) ||
+			    (pdu->hdr.common.plen > SPDK_NVME_TCP_TERM_REQ_PDU_MAX_SIZE)) {
+				plen_error = true;
+			}
+			break;
+
+		default:
+			SPDK_ERRLOG("Unexpected PDU type 0x%02x\n", pdu->hdr.common.pdu_type);
+			fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+			error_offset = offsetof(struct spdk_nvme_tcp_common_pdu_hdr, pdu_type);
+			goto err;
+		}
+	}
+
+	if (pdu->hdr.common.hlen != expected_hlen) {
+		SPDK_ERRLOG("PDU type=0x%02x, Expected ICReq header length %u, got %u on tqpair=%p\n",
+			    pdu->hdr.common.pdu_type,
+			    expected_hlen, pdu->hdr.common.hlen, tqpair);
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+		error_offset = offsetof(struct spdk_nvme_tcp_common_pdu_hdr, hlen);
+		goto err;
+	} else if (pdo_error) {
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+		error_offset = offsetof(struct spdk_nvme_tcp_common_pdu_hdr, pdo);
+	} else if (plen_error) {
+		fes = SPDK_NVME_TCP_TERM_REQ_FES_INVALID_HEADER_FIELD;
+		error_offset = offsetof(struct spdk_nvme_tcp_common_pdu_hdr, plen);
+		goto err;
+	} else {
+		nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PSH);
+		nvme_tcp_pdu_calc_psh_len(&tqpair->pdu_in_progress, tqpair->host_hdgst_enable);
+		return;
+	}
+err:
+	nvmf_tcp_send_c2h_term_req(tqpair, pdu, fes, error_offset);
+}
+
+static int
+nvmf_tcp_pdu_payload_insert_dif(struct nvme_tcp_pdu *pdu, uint32_t read_offset,
+				int read_len)
+{
+	int rc;
+
+	rc = spdk_dif_generate_stream(pdu->data_iov, pdu->data_iovcnt,
+				      read_offset, read_len, pdu->dif_ctx);
+	if (rc != 0) {
+		SPDK_ERRLOG("DIF generate failed\n");
+	}
+
+	return rc;
+}
+
+static int
+nvmf_tcp_sock_process(struct spdk_nvmf_tcp_qpair *tqpair)
+{
+	int rc = 0;
+	struct nvme_tcp_pdu *pdu;
+	enum nvme_tcp_pdu_recv_state prev_state;
+	uint32_t data_len;
+	struct spdk_nvmf_tcp_transport *ttransport = SPDK_CONTAINEROF(tqpair->qpair.transport,
+			struct spdk_nvmf_tcp_transport, transport);
+
+	/* The loop here is to allow for several back-to-back state changes. */
+	do {
+		prev_state = tqpair->recv_state;
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "tqpair(%p) recv pdu entering state %d\n", tqpair, prev_state);
+
+		pdu = &tqpair->pdu_in_progress;
+		switch (tqpair->recv_state) {
+		/* Wait for the common header  */
+		case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY:
+		case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH:
+			if (spdk_unlikely(tqpair->state == NVME_TCP_QPAIR_STATE_INITIALIZING)) {
+				return rc;
+			}
+
+			rc = nvme_tcp_read_data(tqpair->sock,
+						sizeof(struct spdk_nvme_tcp_common_pdu_hdr) - pdu->ch_valid_bytes,
+						(void *)&pdu->hdr.common + pdu->ch_valid_bytes);
+			if (rc < 0) {
+				SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "will disconnect tqpair=%p\n", tqpair);
+				return NVME_TCP_PDU_FATAL;
+			} else if (rc > 0) {
+				pdu->ch_valid_bytes += rc;
+				spdk_trace_record(TRACE_TCP_READ_FROM_SOCKET_DONE, 0, rc, 0, 0);
+				if (spdk_likely(tqpair->recv_state == NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY)) {
+					nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_CH);
+				}
+			}
+
+			if (pdu->ch_valid_bytes < sizeof(struct spdk_nvme_tcp_common_pdu_hdr)) {
+				return NVME_TCP_PDU_IN_PROGRESS;
+			}
+
+			/* The command header of this PDU has now been read from the socket. */
+			nvmf_tcp_pdu_ch_handle(tqpair);
+			break;
+		/* Wait for the pdu specific header  */
+		case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PSH:
+			rc = nvme_tcp_read_data(tqpair->sock,
+						pdu->psh_len - pdu->psh_valid_bytes,
+						(void *)&pdu->hdr.raw + sizeof(struct spdk_nvme_tcp_common_pdu_hdr) + pdu->psh_valid_bytes);
+			if (rc < 0) {
+				return NVME_TCP_PDU_FATAL;
+			} else if (rc > 0) {
+				spdk_trace_record(TRACE_TCP_READ_FROM_SOCKET_DONE,
+						  0, rc, 0, 0);
+				pdu->psh_valid_bytes += rc;
+			}
+
+			if (pdu->psh_valid_bytes < pdu->psh_len) {
+				return NVME_TCP_PDU_IN_PROGRESS;
+			}
+
+			/* All header(ch, psh, head digist) of this PDU has now been read from the socket. */
+			nvmf_tcp_pdu_psh_handle(tqpair, ttransport);
+			break;
+		/* Wait for the req slot */
+		case NVME_TCP_PDU_RECV_STATE_AWAIT_REQ:
+			nvmf_tcp_capsule_cmd_hdr_handle(ttransport, tqpair, pdu);
+			break;
+		case NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD:
+			/* check whether the data is valid, if not we just return */
+			if (!pdu->data_len) {
+				return NVME_TCP_PDU_IN_PROGRESS;
+			}
+
+			data_len = pdu->data_len;
+			/* data digest */
+			if (spdk_unlikely((pdu->hdr.common.pdu_type != SPDK_NVME_TCP_PDU_TYPE_H2C_TERM_REQ) &&
+					  tqpair->host_ddgst_enable)) {
+				data_len += SPDK_NVME_TCP_DIGEST_LEN;
+				pdu->ddgst_enable = true;
+			}
+
+			rc = nvme_tcp_read_payload_data(tqpair->sock, pdu);
+			if (rc < 0) {
+				return NVME_TCP_PDU_FATAL;
+			}
+			pdu->readv_offset += rc;
+
+			if (spdk_unlikely(pdu->dif_ctx != NULL)) {
+				rc = nvmf_tcp_pdu_payload_insert_dif(pdu, pdu->readv_offset - rc, rc);
+				if (rc != 0) {
+					return NVME_TCP_PDU_FATAL;
+				}
+			}
+
+			if (pdu->readv_offset < data_len) {
+				return NVME_TCP_PDU_IN_PROGRESS;
+			}
+
+			/* All of this PDU has now been read from the socket. */
+			nvmf_tcp_pdu_payload_handle(tqpair, ttransport);
+			break;
+		case NVME_TCP_PDU_RECV_STATE_ERROR:
+			if (!spdk_sock_is_connected(tqpair->sock)) {
+				return NVME_TCP_PDU_FATAL;
+			}
+			break;
+		default:
+			assert(0);
+			SPDK_ERRLOG("code should not come to here");
+			break;
+		}
+	} while (tqpair->recv_state != prev_state);
+
+	return rc;
+}
+
+static int
+nvmf_tcp_req_parse_sgl(struct spdk_nvmf_tcp_req *tcp_req,
+		       struct spdk_nvmf_transport *transport,
+		       struct spdk_nvmf_transport_poll_group *group)
+{
+	struct spdk_nvmf_request		*req = &tcp_req->req;
+	struct spdk_nvme_cmd			*cmd;
+	struct spdk_nvme_cpl			*rsp;
+	struct spdk_nvme_sgl_descriptor		*sgl;
+	uint32_t				length;
+
+	cmd = &req->cmd->nvme_cmd;
+	rsp = &req->rsp->nvme_cpl;
+	sgl = &cmd->dptr.sgl1;
+
+	length = sgl->unkeyed.length;
+
+	if (sgl->generic.type == SPDK_NVME_SGL_TYPE_TRANSPORT_DATA_BLOCK &&
+	    sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_TRANSPORT) {
+		if (length > transport->opts.max_io_size) {
+			SPDK_ERRLOG("SGL length 0x%x exceeds max io size 0x%x\n",
+				    length, transport->opts.max_io_size);
+			rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID;
+			return -1;
+		}
+
+		/* fill request length and populate iovs */
+		req->length = length;
+
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Data requested length= 0x%x\n", length);
+
+		if (spdk_unlikely(req->dif.dif_insert_or_strip)) {
+			req->dif.orig_length = length;
+			length = spdk_dif_get_length_with_md(length, &req->dif.dif_ctx);
+			req->dif.elba_length = length;
+		}
+
+		if (spdk_nvmf_request_get_buffers(req, group, transport, length)) {
+			/* No available buffers. Queue this request up. */
+			SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "No available large data buffers. Queueing request %p\n",
+				      tcp_req);
+			return 0;
+		}
+
+		/* backward compatible */
+		req->data = req->iov[0].iov_base;
+
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Request %p took %d buffer/s from central pool, and data=%p\n",
+			      tcp_req, req->iovcnt, req->data);
+
+		return 0;
+	} else if (sgl->generic.type == SPDK_NVME_SGL_TYPE_DATA_BLOCK &&
+		   sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET) {
+		uint64_t offset = sgl->address;
+		uint32_t max_len = transport->opts.in_capsule_data_size;
+
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "In-capsule data: offset 0x%" PRIx64 ", length 0x%x\n",
+			      offset, length);
+
+		if (offset > max_len) {
+			SPDK_ERRLOG("In-capsule offset 0x%" PRIx64 " exceeds capsule length 0x%x\n",
+				    offset, max_len);
+			rsp->status.sc = SPDK_NVME_SC_INVALID_SGL_OFFSET;
+			return -1;
+		}
+		max_len -= (uint32_t)offset;
+
+		if (length > max_len) {
+			SPDK_ERRLOG("In-capsule data length 0x%x exceeds capsule length 0x%x\n",
+				    length, max_len);
+			rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID;
+			return -1;
+		}
+
+		req->data = tcp_req->buf + offset;
+		req->data_from_pool = false;
+		req->length = length;
+
+		if (spdk_unlikely(req->dif.dif_insert_or_strip)) {
+			length = spdk_dif_get_length_with_md(length, &req->dif.dif_ctx);
+			req->dif.elba_length = length;
+		}
+
+		req->iov[0].iov_base = req->data;
+		req->iov[0].iov_len = length;
+		req->iovcnt = 1;
+
+		return 0;
+	}
+
+	SPDK_ERRLOG("Invalid NVMf I/O Command SGL:  Type 0x%x, Subtype 0x%x\n",
+		    sgl->generic.type, sgl->generic.subtype);
+	rsp->status.sc = SPDK_NVME_SC_SGL_DESCRIPTOR_TYPE_INVALID;
+	return -1;
+}
+
+static inline enum spdk_nvme_media_error_status_code
+nvmf_tcp_dif_error_to_compl_status(uint8_t err_type) {
+	enum spdk_nvme_media_error_status_code result;
+
+	switch (err_type)
+	{
+	case SPDK_DIF_REFTAG_ERROR:
+		result = SPDK_NVME_SC_REFERENCE_TAG_CHECK_ERROR;
+		break;
+	case SPDK_DIF_APPTAG_ERROR:
+		result = SPDK_NVME_SC_APPLICATION_TAG_CHECK_ERROR;
+		break;
+	case SPDK_DIF_GUARD_ERROR:
+		result = SPDK_NVME_SC_GUARD_CHECK_ERROR;
+		break;
+	default:
+		SPDK_UNREACHABLE();
+		break;
+	}
+
+	return result;
+}
+
+static void
+nvmf_tcp_send_c2h_data(struct spdk_nvmf_tcp_qpair *tqpair,
+		       struct spdk_nvmf_tcp_req *tcp_req)
+{
+	struct nvme_tcp_pdu *rsp_pdu;
+	struct spdk_nvme_tcp_c2h_data_hdr *c2h_data;
+	uint32_t plen, pdo, alignment;
+	int rc;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "enter\n");
+
+	rsp_pdu = nvmf_tcp_req_pdu_init(tcp_req);
+	assert(rsp_pdu != NULL);
+
+	c2h_data = &rsp_pdu->hdr.c2h_data;
+	c2h_data->common.pdu_type = SPDK_NVME_TCP_PDU_TYPE_C2H_DATA;
+	plen = c2h_data->common.hlen = sizeof(*c2h_data);
+
+	if (tqpair->host_hdgst_enable) {
+		plen += SPDK_NVME_TCP_DIGEST_LEN;
+		c2h_data->common.flags |= SPDK_NVME_TCP_CH_FLAGS_HDGSTF;
+	}
+
+	/* set the psh */
+	c2h_data->cccid = tcp_req->req.cmd->nvme_cmd.cid;
+	c2h_data->datal = tcp_req->req.length;
+	c2h_data->datao = 0;
+
+	/* set the padding */
+	rsp_pdu->padding_len = 0;
+	pdo = plen;
+	if (tqpair->cpda) {
+		alignment = (tqpair->cpda + 1) << 2;
+		if (alignment > plen) {
+			rsp_pdu->padding_len = alignment - plen;
+			pdo = plen = alignment;
+		}
+	}
+
+	c2h_data->common.pdo = pdo;
+	plen += c2h_data->datal;
+	if (tqpair->host_ddgst_enable) {
+		c2h_data->common.flags |= SPDK_NVME_TCP_CH_FLAGS_DDGSTF;
+		plen += SPDK_NVME_TCP_DIGEST_LEN;
+	}
+
+	c2h_data->common.plen = plen;
+
+	if (spdk_unlikely(tcp_req->req.dif.dif_insert_or_strip)) {
+		rsp_pdu->dif_ctx = &tcp_req->req.dif.dif_ctx;
+	}
+
+	nvme_tcp_pdu_set_data_buf(rsp_pdu, tcp_req->req.iov, tcp_req->req.iovcnt,
+				  c2h_data->datao, c2h_data->datal);
+
+	if (spdk_unlikely(tcp_req->req.dif.dif_insert_or_strip)) {
+		struct spdk_nvme_cpl *rsp = &tcp_req->req.rsp->nvme_cpl;
+		struct spdk_dif_error err_blk = {};
+
+		rc = spdk_dif_verify_stream(rsp_pdu->data_iov, rsp_pdu->data_iovcnt,
+					    0, rsp_pdu->data_len, rsp_pdu->dif_ctx, &err_blk);
+		if (rc != 0) {
+			SPDK_ERRLOG("DIF error detected. type=%d, offset=%" PRIu32 "\n",
+				    err_blk.err_type, err_blk.err_offset);
+			rsp->status.sct = SPDK_NVME_SCT_MEDIA_ERROR;
+			rsp->status.sc = nvmf_tcp_dif_error_to_compl_status(err_blk.err_type);
+			nvmf_tcp_req_pdu_fini(tcp_req);
+			nvmf_tcp_send_capsule_resp_pdu(tcp_req, tqpair);
+			return;
+		}
+	}
+
+	c2h_data->common.flags |= SPDK_NVME_TCP_C2H_DATA_FLAGS_LAST_PDU;
+	if (tqpair->qpair.transport->opts.c2h_success) {
+		c2h_data->common.flags |= SPDK_NVME_TCP_C2H_DATA_FLAGS_SUCCESS;
+	}
+
+	nvmf_tcp_qpair_write_pdu(tqpair, rsp_pdu, nvmf_tcp_pdu_c2h_data_complete, tcp_req);
+}
+
+static int
+request_transfer_out(struct spdk_nvmf_request *req)
+{
+	struct spdk_nvmf_tcp_req	*tcp_req;
+	struct spdk_nvmf_qpair		*qpair;
+	struct spdk_nvmf_tcp_qpair	*tqpair;
+	struct spdk_nvme_cpl		*rsp;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "enter\n");
+
+	qpair = req->qpair;
+	rsp = &req->rsp->nvme_cpl;
+	tcp_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_tcp_req, req);
+
+	/* Advance our sq_head pointer */
+	if (qpair->sq_head == qpair->sq_head_max) {
+		qpair->sq_head = 0;
+	} else {
+		qpair->sq_head++;
+	}
+	rsp->sqhd = qpair->sq_head;
+
+	tqpair = SPDK_CONTAINEROF(tcp_req->req.qpair, struct spdk_nvmf_tcp_qpair, qpair);
+	nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST);
+	if (rsp->status.sc == SPDK_NVME_SC_SUCCESS && req->xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
+		nvmf_tcp_send_c2h_data(tqpair, tcp_req);
+	} else {
+		nvmf_tcp_send_capsule_resp_pdu(tcp_req, tqpair);
+	}
+
+	return 0;
+}
+
+static void
+nvmf_tcp_set_incapsule_data(struct spdk_nvmf_tcp_qpair *tqpair,
+			    struct spdk_nvmf_tcp_req *tcp_req)
+{
+	struct nvme_tcp_pdu *pdu;
+	uint32_t plen = 0;
+
+	pdu = &tqpair->pdu_in_progress;
+	plen = pdu->hdr.common.hlen;
+
+	if (tqpair->host_hdgst_enable) {
+		plen += SPDK_NVME_TCP_DIGEST_LEN;
+	}
+
+	if (pdu->hdr.common.plen != plen) {
+		tcp_req->has_incapsule_data = true;
+	}
+}
+
+static bool
+nvmf_tcp_req_process(struct spdk_nvmf_tcp_transport *ttransport,
+		     struct spdk_nvmf_tcp_req *tcp_req)
+{
+	struct spdk_nvmf_tcp_qpair		*tqpair;
+	int					rc;
+	enum spdk_nvmf_tcp_req_state		prev_state;
+	bool					progress = false;
+	struct spdk_nvmf_transport		*transport = &ttransport->transport;
+	struct spdk_nvmf_transport_poll_group	*group;
+
+	tqpair = SPDK_CONTAINEROF(tcp_req->req.qpair, struct spdk_nvmf_tcp_qpair, qpair);
+	group = &tqpair->group->group;
+	assert(tcp_req->state != TCP_REQUEST_STATE_FREE);
+
+	/* If the qpair is not active, we need to abort the outstanding requests. */
+	if (tqpair->qpair.state != SPDK_NVMF_QPAIR_ACTIVE) {
+		if (tcp_req->state == TCP_REQUEST_STATE_NEED_BUFFER) {
+			STAILQ_REMOVE(&group->pending_buf_queue, &tcp_req->req, spdk_nvmf_request, buf_link);
+		}
+		nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_COMPLETED);
+	}
+
+	/* The loop here is to allow for several back-to-back state changes. */
+	do {
+		prev_state = tcp_req->state;
+
+		SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Request %p entering state %d on tqpair=%p\n", tcp_req, prev_state,
+			      tqpair);
+
+		switch (tcp_req->state) {
+		case TCP_REQUEST_STATE_FREE:
+			/* Some external code must kick a request into TCP_REQUEST_STATE_NEW
+			 * to escape this state. */
+			break;
+		case TCP_REQUEST_STATE_NEW:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_NEW, 0, 0, (uintptr_t)tcp_req, 0);
+
+			/* copy the cmd from the receive pdu */
+			tcp_req->cmd = tqpair->pdu_in_progress.hdr.capsule_cmd.ccsqe;
+
+			if (spdk_unlikely(spdk_nvmf_request_get_dif_ctx(&tcp_req->req, &tcp_req->req.dif.dif_ctx))) {
+				tcp_req->req.dif.dif_insert_or_strip = true;
+				tqpair->pdu_in_progress.dif_ctx = &tcp_req->req.dif.dif_ctx;
+			}
+
+			/* The next state transition depends on the data transfer needs of this request. */
+			tcp_req->req.xfer = spdk_nvmf_req_get_xfer(&tcp_req->req);
+
+			/* If no data to transfer, ready to execute. */
+			if (tcp_req->req.xfer == SPDK_NVME_DATA_NONE) {
+				/* Reset the tqpair receving pdu state */
+				nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
+				nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_EXECUTE);
+				break;
+			}
+
+			nvmf_tcp_set_incapsule_data(tqpair, tcp_req);
+
+			if (!tcp_req->has_incapsule_data) {
+				nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_READY);
+			}
+
+			nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_NEED_BUFFER);
+			STAILQ_INSERT_TAIL(&group->pending_buf_queue, &tcp_req->req, buf_link);
+			break;
+		case TCP_REQUEST_STATE_NEED_BUFFER:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_NEED_BUFFER, 0, 0, (uintptr_t)tcp_req, 0);
+
+			assert(tcp_req->req.xfer != SPDK_NVME_DATA_NONE);
+
+			if (!tcp_req->has_incapsule_data && (&tcp_req->req != STAILQ_FIRST(&group->pending_buf_queue))) {
+				SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP,
+					      "Not the first element to wait for the buf for tcp_req(%p) on tqpair=%p\n",
+					      tcp_req, tqpair);
+				/* This request needs to wait in line to obtain a buffer */
+				break;
+			}
+
+			/* Try to get a data buffer */
+			rc = nvmf_tcp_req_parse_sgl(tcp_req, transport, group);
+			if (rc < 0) {
+				STAILQ_REMOVE_HEAD(&group->pending_buf_queue, buf_link);
+				/* Reset the tqpair receving pdu state */
+				nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_ERROR);
+				nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_COMPLETE);
+				break;
+			}
+
+			if (!tcp_req->req.data) {
+				SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "No buffer allocated for tcp_req(%p) on tqpair(%p\n)",
+					      tcp_req, tqpair);
+				/* No buffers available. */
+				break;
+			}
+
+			STAILQ_REMOVE(&group->pending_buf_queue, &tcp_req->req, spdk_nvmf_request, buf_link);
+
+			/* If data is transferring from host to controller, we need to do a transfer from the host. */
+			if (tcp_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
+				if (tcp_req->req.data_from_pool) {
+					SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Sending R2T for tcp_req(%p) on tqpair=%p\n", tcp_req, tqpair);
+					nvmf_tcp_send_r2t_pdu(tqpair, tcp_req);
+				} else {
+					struct nvme_tcp_pdu *pdu;
+
+					nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER);
+
+					pdu = &tqpair->pdu_in_progress;
+					SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Not need to send r2t for tcp_req(%p) on tqpair=%p\n", tcp_req,
+						      tqpair);
+					/* No need to send r2t, contained in the capsuled data */
+					nvme_tcp_pdu_set_data_buf(pdu, tcp_req->req.iov, tcp_req->req.iovcnt,
+								  0, tcp_req->req.length);
+					nvmf_tcp_qpair_set_recv_state(tqpair, NVME_TCP_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD);
+				}
+				break;
+			}
+
+			nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_EXECUTE);
+			break;
+		case TCP_REQUEST_STATE_AWAITING_R2T_ACK:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_AWAIT_R2T_ACK, 0, 0, (uintptr_t)tcp_req, 0);
+			/* The R2T completion or the h2c data incoming will kick it out of this state. */
+			break;
+		case TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER:
+
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER, 0, 0,
+					  (uintptr_t)tcp_req, 0);
+			/* Some external code must kick a request into TCP_REQUEST_STATE_READY_TO_EXECUTE
+			 * to escape this state. */
+			break;
+		case TCP_REQUEST_STATE_READY_TO_EXECUTE:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_READY_TO_EXECUTE, 0, 0, (uintptr_t)tcp_req, 0);
+
+			if (spdk_unlikely(tcp_req->req.dif.dif_insert_or_strip)) {
+				assert(tcp_req->req.dif.elba_length >= tcp_req->req.length);
+				tcp_req->req.length = tcp_req->req.dif.elba_length;
+			}
+
+			nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_EXECUTING);
+			spdk_nvmf_request_exec(&tcp_req->req);
+			break;
+		case TCP_REQUEST_STATE_EXECUTING:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_EXECUTING, 0, 0, (uintptr_t)tcp_req, 0);
+			/* Some external code must kick a request into TCP_REQUEST_STATE_EXECUTED
+			 * to escape this state. */
+			break;
+		case TCP_REQUEST_STATE_EXECUTED:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_EXECUTED, 0, 0, (uintptr_t)tcp_req, 0);
+
+			if (spdk_unlikely(tcp_req->req.dif.dif_insert_or_strip)) {
+				tcp_req->req.length = tcp_req->req.dif.orig_length;
+			}
+
+			nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_READY_TO_COMPLETE);
+			break;
+		case TCP_REQUEST_STATE_READY_TO_COMPLETE:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_READY_TO_COMPLETE, 0, 0, (uintptr_t)tcp_req, 0);
+			rc = request_transfer_out(&tcp_req->req);
+			assert(rc == 0); /* No good way to handle this currently */
+			break;
+		case TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST, 0, 0,
+					  (uintptr_t)tcp_req,
+					  0);
+			/* Some external code must kick a request into TCP_REQUEST_STATE_COMPLETED
+			 * to escape this state. */
+			break;
+		case TCP_REQUEST_STATE_COMPLETED:
+			spdk_trace_record(TRACE_TCP_REQUEST_STATE_COMPLETED, 0, 0, (uintptr_t)tcp_req, 0);
+			if (tcp_req->req.data_from_pool) {
+				spdk_nvmf_request_free_buffers(&tcp_req->req, group, transport);
+			}
+			tcp_req->req.length = 0;
+			tcp_req->req.iovcnt = 0;
+			tcp_req->req.data = NULL;
+
+			nvmf_tcp_req_pdu_fini(tcp_req);
+
+			nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_FREE);
+			break;
+		case TCP_REQUEST_NUM_STATES:
+		default:
+			assert(0);
+			break;
+		}
+
+		if (tcp_req->state != prev_state) {
+			progress = true;
+		}
+	} while (tcp_req->state != prev_state);
+
+	return progress;
+}
+
+static void
+nvmf_tcp_sock_cb(void *arg, struct spdk_sock_group *group, struct spdk_sock *sock)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair = arg;
+	int rc;
+
+	assert(tqpair != NULL);
+	rc = nvmf_tcp_sock_process(tqpair);
+
+	/* If there was a new socket error, disconnect */
+	if (rc < 0) {
+		nvmf_tcp_qpair_disconnect(tqpair);
+	}
+}
+
+static int
+nvmf_tcp_poll_group_add(struct spdk_nvmf_transport_poll_group *group,
+			struct spdk_nvmf_qpair *qpair)
+{
+	struct spdk_nvmf_tcp_poll_group	*tgroup;
+	struct spdk_nvmf_tcp_qpair	*tqpair;
+	int				rc;
+
+	tgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_tcp_poll_group, group);
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+
+	rc = spdk_sock_group_add_sock(tgroup->sock_group, tqpair->sock,
+				      nvmf_tcp_sock_cb, tqpair);
+	if (rc != 0) {
+		SPDK_ERRLOG("Could not add sock to sock_group: %s (%d)\n",
+			    spdk_strerror(errno), errno);
+		return -1;
+	}
+
+	rc =  nvmf_tcp_qpair_sock_init(tqpair);
+	if (rc != 0) {
+		SPDK_ERRLOG("Cannot set sock opt for tqpair=%p\n", tqpair);
+		return -1;
+	}
+
+	rc = nvmf_tcp_qpair_init(&tqpair->qpair);
+	if (rc < 0) {
+		SPDK_ERRLOG("Cannot init tqpair=%p\n", tqpair);
+		return -1;
+	}
+
+	rc = nvmf_tcp_qpair_init_mem_resource(tqpair);
+	if (rc < 0) {
+		SPDK_ERRLOG("Cannot init memory resource info for tqpair=%p\n", tqpair);
+		return -1;
+	}
+
+	tqpair->group = tgroup;
+	tqpair->state = NVME_TCP_QPAIR_STATE_INVALID;
+	TAILQ_INSERT_TAIL(&tgroup->qpairs, tqpair, link);
+
+	return 0;
+}
+
+static int
+nvmf_tcp_poll_group_remove(struct spdk_nvmf_transport_poll_group *group,
+			   struct spdk_nvmf_qpair *qpair)
+{
+	struct spdk_nvmf_tcp_poll_group	*tgroup;
+	struct spdk_nvmf_tcp_qpair		*tqpair;
+	int				rc;
+
+	tgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_tcp_poll_group, group);
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+
+	assert(tqpair->group == tgroup);
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "remove tqpair=%p from the tgroup=%p\n", tqpair, tgroup);
+	if (tqpair->recv_state == NVME_TCP_PDU_RECV_STATE_AWAIT_REQ) {
+		TAILQ_REMOVE(&tgroup->await_req, tqpair, link);
+	} else {
+		TAILQ_REMOVE(&tgroup->qpairs, tqpair, link);
+	}
+
+	rc = spdk_sock_group_remove_sock(tgroup->sock_group, tqpair->sock);
+	if (rc != 0) {
+		SPDK_ERRLOG("Could not remove sock from sock_group: %s (%d)\n",
+			    spdk_strerror(errno), errno);
+	}
+
+	return rc;
+}
+
+static int
+nvmf_tcp_req_complete(struct spdk_nvmf_request *req)
+{
+	struct spdk_nvmf_tcp_transport *ttransport;
+	struct spdk_nvmf_tcp_req *tcp_req;
+
+	ttransport = SPDK_CONTAINEROF(req->qpair->transport, struct spdk_nvmf_tcp_transport, transport);
+	tcp_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_tcp_req, req);
+
+	nvmf_tcp_req_set_state(tcp_req, TCP_REQUEST_STATE_EXECUTED);
+	nvmf_tcp_req_process(ttransport, tcp_req);
+
+	return 0;
+}
+
+static void
+nvmf_tcp_close_qpair(struct spdk_nvmf_qpair *qpair)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair;
+
+	SPDK_DEBUGLOG(SPDK_LOG_NVMF_TCP, "Qpair: %p\n", qpair);
+
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+	tqpair->state = NVME_TCP_QPAIR_STATE_EXITED;
+	nvmf_tcp_qpair_destroy(tqpair);
+}
+
+static int
+nvmf_tcp_poll_group_poll(struct spdk_nvmf_transport_poll_group *group)
+{
+	struct spdk_nvmf_tcp_poll_group *tgroup;
+	int rc;
+	struct spdk_nvmf_request *req, *req_tmp;
+	struct spdk_nvmf_tcp_req *tcp_req;
+	struct spdk_nvmf_tcp_qpair *tqpair, *tqpair_tmp;
+	struct spdk_nvmf_tcp_transport *ttransport = SPDK_CONTAINEROF(group->transport,
+			struct spdk_nvmf_tcp_transport, transport);
+
+	tgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_tcp_poll_group, group);
+
+	if (spdk_unlikely(TAILQ_EMPTY(&tgroup->qpairs) && TAILQ_EMPTY(&tgroup->await_req))) {
+		return 0;
+	}
+
+	STAILQ_FOREACH_SAFE(req, &group->pending_buf_queue, buf_link, req_tmp) {
+		tcp_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_tcp_req, req);
+		if (nvmf_tcp_req_process(ttransport, tcp_req) == false) {
+			break;
+		}
+	}
+
+	rc = spdk_sock_group_poll(tgroup->sock_group);
+	if (rc < 0) {
+		SPDK_ERRLOG("Failed to poll sock_group=%p\n", tgroup->sock_group);
+	}
+
+	TAILQ_FOREACH_SAFE(tqpair, &tgroup->await_req, link, tqpair_tmp) {
+		nvmf_tcp_sock_process(tqpair);
+	}
+
+	return rc;
+}
+
+static int
+nvmf_tcp_qpair_get_trid(struct spdk_nvmf_qpair *qpair,
+			struct spdk_nvme_transport_id *trid, bool peer)
+{
+	struct spdk_nvmf_tcp_qpair     *tqpair;
+	uint16_t			port;
+
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+	spdk_nvme_trid_populate_transport(trid, SPDK_NVME_TRANSPORT_TCP);
+
+	if (peer) {
+		snprintf(trid->traddr, sizeof(trid->traddr), "%s", tqpair->initiator_addr);
+		port = tqpair->initiator_port;
+	} else {
+		snprintf(trid->traddr, sizeof(trid->traddr), "%s", tqpair->target_addr);
+		port = tqpair->target_port;
+	}
+
+	if (spdk_sock_is_ipv4(tqpair->sock)) {
+		trid->adrfam = SPDK_NVMF_ADRFAM_IPV4;
+	} else if (spdk_sock_is_ipv6(tqpair->sock)) {
+		trid->adrfam = SPDK_NVMF_ADRFAM_IPV6;
+	} else {
+		return -1;
+	}
+
+	snprintf(trid->trsvcid, sizeof(trid->trsvcid), "%d", port);
+	return 0;
+}
+
+static int
+nvmf_tcp_qpair_get_local_trid(struct spdk_nvmf_qpair *qpair,
+			      struct spdk_nvme_transport_id *trid)
+{
+	return nvmf_tcp_qpair_get_trid(qpair, trid, 0);
+}
+
+static int
+nvmf_tcp_qpair_get_peer_trid(struct spdk_nvmf_qpair *qpair,
+			     struct spdk_nvme_transport_id *trid)
+{
+	return nvmf_tcp_qpair_get_trid(qpair, trid, 1);
+}
+
+static int
+nvmf_tcp_qpair_get_listen_trid(struct spdk_nvmf_qpair *qpair,
+			       struct spdk_nvme_transport_id *trid)
+{
+	return nvmf_tcp_qpair_get_trid(qpair, trid, 0);
+}
+
+static void
+nvmf_tcp_req_set_abort_status(struct spdk_nvmf_request *req,
+			      struct spdk_nvmf_tcp_req *tcp_req_to_abort)
+{
+	tcp_req_to_abort->req.rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
+	tcp_req_to_abort->req.rsp->nvme_cpl.status.sc = SPDK_NVME_SC_ABORTED_BY_REQUEST;
+
+	nvmf_tcp_req_set_state(tcp_req_to_abort, TCP_REQUEST_STATE_READY_TO_COMPLETE);
+
+	req->rsp->nvme_cpl.cdw0 &= ~1U; /* Command was successfully aborted. */
+}
+
+static int
+_nvmf_tcp_qpair_abort_request(void *ctx)
+{
+	struct spdk_nvmf_request *req = ctx;
+	struct spdk_nvmf_tcp_req *tcp_req_to_abort = SPDK_CONTAINEROF(req->req_to_abort,
+			struct spdk_nvmf_tcp_req, req);
+	struct spdk_nvmf_tcp_qpair *tqpair = SPDK_CONTAINEROF(req->req_to_abort->qpair,
+					     struct spdk_nvmf_tcp_qpair, qpair);
+	int rc;
+
+	spdk_poller_unregister(&req->poller);
+
+	switch (tcp_req_to_abort->state) {
+	case TCP_REQUEST_STATE_EXECUTING:
+		rc = nvmf_ctrlr_abort_request(req);
+		if (rc == SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS) {
+			return SPDK_POLLER_BUSY;
+		}
+		break;
+
+	case TCP_REQUEST_STATE_NEED_BUFFER:
+		STAILQ_REMOVE(&tqpair->group->group.pending_buf_queue,
+			      &tcp_req_to_abort->req, spdk_nvmf_request, buf_link);
+
+		nvmf_tcp_req_set_abort_status(req, tcp_req_to_abort);
+		break;
+
+	case TCP_REQUEST_STATE_AWAITING_R2T_ACK:
+		nvmf_tcp_req_set_abort_status(req, tcp_req_to_abort);
+		break;
+
+	case TCP_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER:
+		if (spdk_get_ticks() < req->timeout_tsc) {
+			req->poller = SPDK_POLLER_REGISTER(_nvmf_tcp_qpair_abort_request, req, 0);
+			return SPDK_POLLER_BUSY;
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	spdk_nvmf_request_complete(req);
+	return SPDK_POLLER_BUSY;
+}
+
+static void
+nvmf_tcp_qpair_abort_request(struct spdk_nvmf_qpair *qpair,
+			     struct spdk_nvmf_request *req)
+{
+	struct spdk_nvmf_tcp_qpair *tqpair;
+	struct spdk_nvmf_tcp_transport *ttransport;
+	struct spdk_nvmf_transport *transport;
+	uint16_t cid;
+	uint32_t i;
+	struct spdk_nvmf_tcp_req *tcp_req_to_abort = NULL;
+
+	tqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_tcp_qpair, qpair);
+	ttransport = SPDK_CONTAINEROF(qpair->transport, struct spdk_nvmf_tcp_transport, transport);
+	transport = &ttransport->transport;
+
+	cid = req->cmd->nvme_cmd.cdw10_bits.abort.cid;
+
+	for (i = 0; i < tqpair->resource_count; i++) {
+		tcp_req_to_abort = &tqpair->reqs[i];
+
+		if (tcp_req_to_abort->state != TCP_REQUEST_STATE_FREE &&
+		    tcp_req_to_abort->req.cmd->nvme_cmd.cid == cid) {
+			break;
+		}
+	}
+
+	if (tcp_req_to_abort == NULL) {
+		spdk_nvmf_request_complete(req);
+		return;
+	}
+
+	req->req_to_abort = &tcp_req_to_abort->req;
+	req->timeout_tsc = spdk_get_ticks() +
+			   transport->opts.abort_timeout_sec * spdk_get_ticks_hz();
+	req->poller = NULL;
+
+	_nvmf_tcp_qpair_abort_request(req);
+}
+
+#define SPDK_NVMF_TCP_DEFAULT_MAX_QUEUE_DEPTH 128
+#define SPDK_NVMF_TCP_DEFAULT_AQ_DEPTH 128
+#define SPDK_NVMF_TCP_DEFAULT_MAX_QPAIRS_PER_CTRLR 128
+#define SPDK_NVMF_TCP_DEFAULT_IN_CAPSULE_DATA_SIZE 4096
+#define SPDK_NVMF_TCP_DEFAULT_MAX_IO_SIZE 131072
+#define SPDK_NVMF_TCP_DEFAULT_IO_UNIT_SIZE 131072
+#define SPDK_NVMF_TCP_DEFAULT_NUM_SHARED_BUFFERS 511
+#define SPDK_NVMF_TCP_DEFAULT_BUFFER_CACHE_SIZE 32
+#define SPDK_NVMF_TCP_DEFAULT_SUCCESS_OPTIMIZATION true
+#define SPDK_NVMF_TCP_DEFAULT_DIF_INSERT_OR_STRIP false
+#define SPDK_NVMF_TCP_DEFAULT_SOCK_PRIORITY 0
+#define SPDK_NVMF_TCP_DEFAULT_ABORT_TIMEOUT_SEC 1
+
+static void
+nvmf_tcp_opts_init(struct spdk_nvmf_transport_opts *opts)
+{
+	opts->max_queue_depth =		SPDK_NVMF_TCP_DEFAULT_MAX_QUEUE_DEPTH;
+	opts->max_qpairs_per_ctrlr =	SPDK_NVMF_TCP_DEFAULT_MAX_QPAIRS_PER_CTRLR;
+	opts->in_capsule_data_size =	SPDK_NVMF_TCP_DEFAULT_IN_CAPSULE_DATA_SIZE;
+	opts->max_io_size =		SPDK_NVMF_TCP_DEFAULT_MAX_IO_SIZE;
+	opts->io_unit_size =		SPDK_NVMF_TCP_DEFAULT_IO_UNIT_SIZE;
+	opts->max_aq_depth =		SPDK_NVMF_TCP_DEFAULT_AQ_DEPTH;
+	opts->num_shared_buffers =	SPDK_NVMF_TCP_DEFAULT_NUM_SHARED_BUFFERS;
+	opts->buf_cache_size =		SPDK_NVMF_TCP_DEFAULT_BUFFER_CACHE_SIZE;
+	opts->c2h_success =		SPDK_NVMF_TCP_DEFAULT_SUCCESS_OPTIMIZATION;
+	opts->dif_insert_or_strip =	SPDK_NVMF_TCP_DEFAULT_DIF_INSERT_OR_STRIP;
+	opts->sock_priority =		SPDK_NVMF_TCP_DEFAULT_SOCK_PRIORITY;
+	opts->abort_timeout_sec =	SPDK_NVMF_TCP_DEFAULT_ABORT_TIMEOUT_SEC;
+}
+
+const struct spdk_nvmf_transport_ops spdk_nvmf_transport_tcp = {
+	.name = "TCP",
+	.type = SPDK_NVME_TRANSPORT_TCP,
+	.opts_init = nvmf_tcp_opts_init,
+	.create = nvmf_tcp_create,
+	.destroy = nvmf_tcp_destroy,
+
+	.listen = nvmf_tcp_listen,
+	.stop_listen = nvmf_tcp_stop_listen,
+	.accept = nvmf_tcp_accept,
+
+	.listener_discover = nvmf_tcp_discover,
+
+	.poll_group_create = nvmf_tcp_poll_group_create,
+	.get_optimal_poll_group = nvmf_tcp_get_optimal_poll_group,
+	.poll_group_destroy = nvmf_tcp_poll_group_destroy,
+	.poll_group_add = nvmf_tcp_poll_group_add,
+	.poll_group_remove = nvmf_tcp_poll_group_remove,
+	.poll_group_poll = nvmf_tcp_poll_group_poll,
+
+	.req_free = nvmf_tcp_req_free,
+	.req_complete = nvmf_tcp_req_complete,
+
+	.qpair_fini = nvmf_tcp_close_qpair,
+	.qpair_get_local_trid = nvmf_tcp_qpair_get_local_trid,
+	.qpair_get_peer_trid = nvmf_tcp_qpair_get_peer_trid,
+	.qpair_get_listen_trid = nvmf_tcp_qpair_get_listen_trid,
+	.qpair_abort_request = nvmf_tcp_qpair_abort_request,
+};
+
+SPDK_NVMF_TRANSPORT_REGISTER(tcp, &spdk_nvmf_transport_tcp);
+SPDK_LOG_REGISTER_COMPONENT("nvmf_tcp", SPDK_LOG_NVMF_TCP)