text: /*-
   *   BSD LICENSE
   *
   *   Copyright (c) Intel Corporation. All rights reserved.
   *   Copyright (c) 2019 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 "nvmf_internal.h"
  #include "transport.h"
  
  #include "spdk/bit_array.h"
  #include "spdk/endian.h"
  #include "spdk/thread.h"
  #include "spdk/trace.h"
  #include "spdk/nvme_spec.h"
  #include "spdk/string.h"
  #include "spdk/util.h"
  #include "spdk/version.h"
  
  #include "spdk_internal/log.h"
  
  #define MIN_KEEP_ALIVE_TIMEOUT_IN_MS 10000
  #define NVMF_DISC_KATO_IN_MS 120000
  #define KAS_TIME_UNIT_IN_MS 100
  #define KAS_DEFAULT_VALUE (MIN_KEEP_ALIVE_TIMEOUT_IN_MS / KAS_TIME_UNIT_IN_MS)
  
  /*
   * Report the SPDK version as the firmware revision.
   * SPDK_VERSION_STRING won't fit into FR (only 8 bytes), so try to fit the most important parts.
   */
  #define FW_VERSION SPDK_VERSION_MAJOR_STRING SPDK_VERSION_MINOR_STRING SPDK_VERSION_PATCH_STRING
  
  static inline void
  spdk_nvmf_invalid_connect_response(struct spdk_nvmf_fabric_connect_rsp *rsp,
  				   uint8_t iattr, uint16_t ipo)
  {
  	rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  	rsp->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_PARAM;
  	rsp->status_code_specific.invalid.iattr = iattr;
  	rsp->status_code_specific.invalid.ipo = ipo;
  }
  
  #define SPDK_NVMF_INVALID_CONNECT_CMD(rsp, field)	\
  	spdk_nvmf_invalid_connect_response(rsp, 0, offsetof(struct spdk_nvmf_fabric_connect_cmd, field))
  #define SPDK_NVMF_INVALID_CONNECT_DATA(rsp, field)	\
  	spdk_nvmf_invalid_connect_response(rsp, 1, offsetof(struct spdk_nvmf_fabric_connect_data, field))
  
  static void
  spdk_nvmf_ctrlr_stop_keep_alive_timer(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	if (!ctrlr) {
  		SPDK_ERRLOG("Controller is NULL\n");
  		return;
  	}
  
  	if (ctrlr->keep_alive_poller == NULL) {
  		return;
  	}
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Stop keep alive poller\n");
  	spdk_poller_unregister(&ctrlr->keep_alive_poller);
  }
  
  static void
  spdk_nvmf_ctrlr_disconnect_qpairs_done(struct spdk_io_channel_iter *i, int status)
  {
  	if (status == 0) {
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "ctrlr disconnect qpairs complete successfully\n");
  	} else {
  		SPDK_ERRLOG("Fail to disconnect ctrlr qpairs\n");
  	}
  }
  
  static void
  spdk_nvmf_ctrlr_disconnect_qpairs_on_pg(struct spdk_io_channel_iter *i)
  {
  	int rc = 0;
  	struct spdk_nvmf_ctrlr *ctrlr;
  	struct spdk_nvmf_qpair *qpair, *temp_qpair;
  	struct spdk_io_channel *ch;
  	struct spdk_nvmf_poll_group *group;
  
  	ctrlr = spdk_io_channel_iter_get_ctx(i);
  	ch = spdk_io_channel_iter_get_channel(i);
  	group = spdk_io_channel_get_ctx(ch);
  
  	TAILQ_FOREACH_SAFE(qpair, &group->qpairs, link, temp_qpair) {
  		if (qpair->ctrlr == ctrlr) {
  			rc = spdk_nvmf_qpair_disconnect(qpair, NULL, NULL);
  			if (rc) {
  				SPDK_ERRLOG("Qpair disconnect failed\n");
  				goto next_channel;
  			}
  		}
  	}
  
  next_channel:
  	spdk_for_each_channel_continue(i, rc);
  }
  
  static int
  spdk_nvmf_ctrlr_keep_alive_poll(void *ctx)
  {
  	uint64_t keep_alive_timeout_tick;
  	uint64_t now = spdk_get_ticks();
  	struct spdk_nvmf_ctrlr *ctrlr = ctx;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Polling ctrlr keep alive timeout\n");
  
  	/* If the Keep alive feature is in use and the timer expires */
  	keep_alive_timeout_tick = ctrlr->last_keep_alive_tick +
  				  ctrlr->feat.keep_alive_timer.bits.kato * spdk_get_ticks_hz() / UINT64_C(1000);
  	if (now > keep_alive_timeout_tick) {
  		SPDK_NOTICELOG("Disconnecting host from subsystem %s due to keep alive timeout.\n",
  			       ctrlr->subsys->subnqn);
  		/* set the Controller Fatal Status bit to '1' */
  		if (ctrlr->vcprop.csts.bits.cfs == 0) {
  			ctrlr->vcprop.csts.bits.cfs = 1;
  
  			/*
  			 * disconnect qpairs, terminate Transport connection
  			 * destroy ctrlr, break the host to controller association
  			 * disconnect qpairs with qpair->ctrlr == ctrlr
  			 */
  			spdk_for_each_channel(ctrlr->subsys->tgt,
  					      spdk_nvmf_ctrlr_disconnect_qpairs_on_pg,
  					      ctrlr,
  					      spdk_nvmf_ctrlr_disconnect_qpairs_done);
  		}
  	}
  
  	return 1;
  }
  
  static void
  spdk_nvmf_ctrlr_start_keep_alive_timer(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	if (!ctrlr) {
  		SPDK_ERRLOG("Controller is NULL\n");
  		return;
  	}
  
  	/* if cleared to 0 then the Keep Alive Timer is disabled */
  	if (ctrlr->feat.keep_alive_timer.bits.kato != 0) {
  
  		ctrlr->last_keep_alive_tick = spdk_get_ticks();
  
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Ctrlr add keep alive poller\n");
  		ctrlr->keep_alive_poller = spdk_poller_register(spdk_nvmf_ctrlr_keep_alive_poll, ctrlr,
  					   ctrlr->feat.keep_alive_timer.bits.kato * 1000);
  	}
  }
  
  static void
  ctrlr_add_qpair_and_update_rsp(struct spdk_nvmf_qpair *qpair,
  			       struct spdk_nvmf_ctrlr *ctrlr,
  			       struct spdk_nvmf_fabric_connect_rsp *rsp)
  {
  	assert(ctrlr->admin_qpair->group->thread == spdk_get_thread());
  
  	/* check if we would exceed ctrlr connection limit */
  	if (qpair->qid >= spdk_bit_array_capacity(ctrlr->qpair_mask)) {
  		SPDK_ERRLOG("Requested QID %u but Max QID is %u\n",
  			    qpair->qid, spdk_bit_array_capacity(ctrlr->qpair_mask) - 1);
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_QUEUE_IDENTIFIER;
  		return;
  	}
  
  	if (spdk_bit_array_get(ctrlr->qpair_mask, qpair->qid)) {
  		SPDK_ERRLOG("Got I/O connect with duplicate QID %u\n", qpair->qid);
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_QUEUE_IDENTIFIER;
  		return;
  	}
  
  	qpair->ctrlr = ctrlr;
  	spdk_bit_array_set(ctrlr->qpair_mask, qpair->qid);
  
  	rsp->status.sc = SPDK_NVME_SC_SUCCESS;
  	rsp->status_code_specific.success.cntlid = ctrlr->cntlid;
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "connect capsule response: cntlid = 0x%04x\n",
  		      rsp->status_code_specific.success.cntlid);
  }
  
  static void
  _spdk_nvmf_request_complete(void *ctx)
  {
  	struct spdk_nvmf_request *req = ctx;
  
  	spdk_nvmf_request_complete(req);
  }
  
  static void
  _spdk_nvmf_ctrlr_add_admin_qpair(void *ctx)
  {
  	struct spdk_nvmf_request *req = ctx;
  	struct spdk_nvmf_fabric_connect_rsp *rsp = &req->rsp->connect_rsp;
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	struct spdk_nvmf_ctrlr *ctrlr = qpair->ctrlr;
  
  	ctrlr->admin_qpair = qpair;
  	spdk_nvmf_ctrlr_start_keep_alive_timer(ctrlr);
  	ctrlr_add_qpair_and_update_rsp(qpair, ctrlr, rsp);
  	spdk_nvmf_request_complete(req);
  }
  
  static void
  _spdk_nvmf_subsystem_add_ctrlr(void *ctx)
  {
  	struct spdk_nvmf_request *req = ctx;
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	struct spdk_nvmf_fabric_connect_rsp *rsp = &req->rsp->connect_rsp;
  	struct spdk_nvmf_ctrlr *ctrlr = qpair->ctrlr;
  
  	if (spdk_nvmf_subsystem_add_ctrlr(ctrlr->subsys, ctrlr)) {
  		SPDK_ERRLOG("Unable to add controller to subsystem\n");
  		spdk_bit_array_free(&ctrlr->qpair_mask);
  		free(ctrlr);
  		qpair->ctrlr = NULL;
  		rsp->status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
  		spdk_thread_send_msg(qpair->group->thread, _spdk_nvmf_request_complete, req);
  		return;
  	}
  
  	spdk_thread_send_msg(ctrlr->thread, _spdk_nvmf_ctrlr_add_admin_qpair, req);
  }
  
  static struct spdk_nvmf_ctrlr *
  spdk_nvmf_ctrlr_create(struct spdk_nvmf_subsystem *subsystem,
  		       struct spdk_nvmf_request *req,
  		       struct spdk_nvmf_fabric_connect_cmd *connect_cmd,
  		       struct spdk_nvmf_fabric_connect_data *connect_data)
  {
  	struct spdk_nvmf_ctrlr	*ctrlr;
  	struct spdk_nvmf_transport *transport;
  
  	ctrlr = calloc(1, sizeof(*ctrlr));
  	if (ctrlr == NULL) {
  		SPDK_ERRLOG("Memory allocation failed\n");
  		return NULL;
  	}
  
  	TAILQ_INIT(&ctrlr->log_head);
  	ctrlr->subsys = subsystem;
  	ctrlr->thread = req->qpair->group->thread;
  
  	transport = req->qpair->transport;
  	ctrlr->qpair_mask = spdk_bit_array_create(transport->opts.max_qpairs_per_ctrlr);
  	if (!ctrlr->qpair_mask) {
  		SPDK_ERRLOG("Failed to allocate controller qpair mask\n");
  		free(ctrlr);
  		return NULL;
  	}
  
  	/*
  	 * KAS: this field indicates the granularity of the Keep Alive Timer in 100ms units
  	 * keep-alive timeout in milliseconds
  	 */
  	ctrlr->feat.keep_alive_timer.bits.kato = spdk_divide_round_up(connect_cmd->kato,
  			KAS_DEFAULT_VALUE * KAS_TIME_UNIT_IN_MS) *
  			KAS_DEFAULT_VALUE * KAS_TIME_UNIT_IN_MS;
  	ctrlr->feat.async_event_configuration.bits.ns_attr_notice = 1;
  	ctrlr->feat.volatile_write_cache.bits.wce = 1;
  
  	if (ctrlr->subsys->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) {
  		/*
  		 * If keep-alive timeout is not set, discovery controllers use some
  		 * arbitrary high value in order to cleanup stale discovery sessions
  		 *
  		 * From the 1.0a nvme-of spec:
  		 * "The Keep Alive command is reserved for
  		 * Discovery controllers. A transport may specify a
  		 * fixed Discovery controller activity timeout value
  		 * (e.g., 2 minutes).  If no commands are received
  		 * by a Discovery controller within that time
  		 * period, the controller may perform the
  		 * actions for Keep Alive Timer expiration".
  		 * kato is in millisecond.
  		 */
  		if (ctrlr->feat.keep_alive_timer.bits.kato == 0) {
  			ctrlr->feat.keep_alive_timer.bits.kato = NVMF_DISC_KATO_IN_MS;
  		}
  	}
  
  	/* Subtract 1 for admin queue, 1 for 0's based */
  	ctrlr->feat.number_of_queues.bits.ncqr = transport->opts.max_qpairs_per_ctrlr - 1 -
  			1;
  	ctrlr->feat.number_of_queues.bits.nsqr = transport->opts.max_qpairs_per_ctrlr - 1 -
  			1;
  
  	spdk_uuid_copy(&ctrlr->hostid, (struct spdk_uuid *)connect_data->hostid);
  	memcpy(ctrlr->hostnqn, connect_data->hostnqn, sizeof(ctrlr->hostnqn));
  
  	ctrlr->vcprop.cap.raw = 0;
  	ctrlr->vcprop.cap.bits.cqr = 1; /* NVMe-oF specification required */
  	ctrlr->vcprop.cap.bits.mqes = transport->opts.max_queue_depth -
  				      1; /* max queue depth */
  	ctrlr->vcprop.cap.bits.ams = 0; /* optional arb mechanisms */
  	ctrlr->vcprop.cap.bits.to = 1; /* ready timeout - 500 msec units */
  	ctrlr->vcprop.cap.bits.dstrd = 0; /* fixed to 0 for NVMe-oF */
  	ctrlr->vcprop.cap.bits.css = SPDK_NVME_CAP_CSS_NVM; /* NVM command set */
  	ctrlr->vcprop.cap.bits.mpsmin = 0; /* 2 ^ (12 + mpsmin) == 4k */
  	ctrlr->vcprop.cap.bits.mpsmax = 0; /* 2 ^ (12 + mpsmax) == 4k */
  
  	/* Version Supported: 1.3 */
  	ctrlr->vcprop.vs.bits.mjr = 1;
  	ctrlr->vcprop.vs.bits.mnr = 3;
  	ctrlr->vcprop.vs.bits.ter = 0;
  
  	ctrlr->vcprop.cc.raw = 0;
  	ctrlr->vcprop.cc.bits.en = 0; /* Init controller disabled */
  
  	ctrlr->vcprop.csts.raw = 0;
  	ctrlr->vcprop.csts.bits.rdy = 0; /* Init controller as not ready */
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "cap 0x%" PRIx64 "\n", ctrlr->vcprop.cap.raw);
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "vs 0x%x\n", ctrlr->vcprop.vs.raw);
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "cc 0x%x\n", ctrlr->vcprop.cc.raw);
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "csts 0x%x\n", ctrlr->vcprop.csts.raw);
  
  	ctrlr->dif_insert_or_strip = transport->opts.dif_insert_or_strip;
  
  	req->qpair->ctrlr = ctrlr;
  	spdk_thread_send_msg(subsystem->thread, _spdk_nvmf_subsystem_add_ctrlr, req);
  
  	return ctrlr;
  }
  
  static void
  _spdk_nvmf_ctrlr_destruct(void *ctx)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = ctx;
  	struct spdk_nvmf_reservation_log *log, *log_tmp;
  
  	spdk_nvmf_ctrlr_stop_keep_alive_timer(ctrlr);
  
  	TAILQ_FOREACH_SAFE(log, &ctrlr->log_head, link, log_tmp) {
  		TAILQ_REMOVE(&ctrlr->log_head, log, link);
  		free(log);
  	}
  	free(ctrlr);
  }
  
  void
  spdk_nvmf_ctrlr_destruct(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	spdk_nvmf_subsystem_remove_ctrlr(ctrlr->subsys, ctrlr);
  
  	spdk_thread_send_msg(ctrlr->thread, _spdk_nvmf_ctrlr_destruct, ctrlr);
  }
  
  static void
  spdk_nvmf_ctrlr_add_io_qpair(void *ctx)
  {
  	struct spdk_nvmf_request *req = ctx;
  	struct spdk_nvmf_fabric_connect_rsp *rsp = &req->rsp->connect_rsp;
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	struct spdk_nvmf_ctrlr *ctrlr = qpair->ctrlr;
  
  	/* Unit test will check qpair->ctrlr after calling spdk_nvmf_ctrlr_connect.
  	  * For error case, the value should be NULL. So set it to NULL at first.
  	  */
  	qpair->ctrlr = NULL;
  
  	if (ctrlr->subsys->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) {
  		SPDK_ERRLOG("I/O connect not allowed on discovery controller\n");
  		SPDK_NVMF_INVALID_CONNECT_CMD(rsp, qid);
  		goto end;
  	}
  
  	if (!ctrlr->vcprop.cc.bits.en) {
  		SPDK_ERRLOG("Got I/O connect before ctrlr was enabled\n");
  		SPDK_NVMF_INVALID_CONNECT_CMD(rsp, qid);
  		goto end;
  	}
  
  	if (1u << ctrlr->vcprop.cc.bits.iosqes != sizeof(struct spdk_nvme_cmd)) {
  		SPDK_ERRLOG("Got I/O connect with invalid IOSQES %u\n",
  			    ctrlr->vcprop.cc.bits.iosqes);
  		SPDK_NVMF_INVALID_CONNECT_CMD(rsp, qid);
  		goto end;
  	}
  
  	if (1u << ctrlr->vcprop.cc.bits.iocqes != sizeof(struct spdk_nvme_cpl)) {
  		SPDK_ERRLOG("Got I/O connect with invalid IOCQES %u\n",
  			    ctrlr->vcprop.cc.bits.iocqes);
  		SPDK_NVMF_INVALID_CONNECT_CMD(rsp, qid);
  		goto end;
  	}
  
  	ctrlr_add_qpair_and_update_rsp(qpair, ctrlr, rsp);
  end:
  	spdk_thread_send_msg(qpair->group->thread, _spdk_nvmf_request_complete, req);
  }
  
  static void
  _spdk_nvmf_ctrlr_add_io_qpair(void *ctx)
  {
  	struct spdk_nvmf_request *req = ctx;
  	struct spdk_nvmf_fabric_connect_rsp *rsp = &req->rsp->connect_rsp;
  	struct spdk_nvmf_fabric_connect_data *data = req->data;
  	struct spdk_nvmf_ctrlr *ctrlr;
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	struct spdk_nvmf_qpair *admin_qpair;
  	struct spdk_nvmf_tgt *tgt = qpair->transport->tgt;
  	struct spdk_nvmf_subsystem *subsystem;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Connect I/O Queue for controller id 0x%x\n", data->cntlid);
  
  	subsystem = spdk_nvmf_tgt_find_subsystem(tgt, data->subnqn);
  	/* We already checked this in spdk_nvmf_ctrlr_connect */
  	assert(subsystem != NULL);
  
  	ctrlr = spdk_nvmf_subsystem_get_ctrlr(subsystem, data->cntlid);
  	if (ctrlr == NULL) {
  		SPDK_ERRLOG("Unknown controller ID 0x%x\n", data->cntlid);
  		SPDK_NVMF_INVALID_CONNECT_DATA(rsp, cntlid);
  		spdk_thread_send_msg(qpair->group->thread, _spdk_nvmf_request_complete, req);
  		return;
  	}
  
  	admin_qpair = ctrlr->admin_qpair;
  	qpair->ctrlr = ctrlr;
  	spdk_thread_send_msg(admin_qpair->group->thread, spdk_nvmf_ctrlr_add_io_qpair, req);
  }
  
  static int
  spdk_nvmf_ctrlr_connect(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_fabric_connect_data *data = req->data;
  	struct spdk_nvmf_fabric_connect_cmd *cmd = &req->cmd->connect_cmd;
  	struct spdk_nvmf_fabric_connect_rsp *rsp = &req->rsp->connect_rsp;
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	struct spdk_nvmf_transport *transport = qpair->transport;
  	struct spdk_nvmf_tgt *tgt = transport->tgt;
  	struct spdk_nvmf_ctrlr *ctrlr;
  	struct spdk_nvmf_subsystem *subsystem;
  	const char *subnqn, *hostnqn;
  	struct spdk_nvme_transport_id listen_trid = {};
  	void *end;
  
  	if (req->length < sizeof(struct spdk_nvmf_fabric_connect_data)) {
  		SPDK_ERRLOG("Connect command data length 0x%x too small\n", req->length);
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "recfmt 0x%x qid %u sqsize %u\n",
  		      cmd->recfmt, cmd->qid, cmd->sqsize);
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Connect data:\n");
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "  cntlid:  0x%04x\n", data->cntlid);
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "  hostid: %08x-%04x-%04x-%02x%02x-%04x%08x ***\n",
  		      ntohl(*(uint32_t *)&data->hostid[0]),
  		      ntohs(*(uint16_t *)&data->hostid[4]),
  		      ntohs(*(uint16_t *)&data->hostid[6]),
  		      data->hostid[8],
  		      data->hostid[9],
  		      ntohs(*(uint16_t *)&data->hostid[10]),
  		      ntohl(*(uint32_t *)&data->hostid[12]));
  
  	if (cmd->recfmt != 0) {
  		SPDK_ERRLOG("Connect command unsupported RECFMT %u\n", cmd->recfmt);
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVMF_FABRIC_SC_INCOMPATIBLE_FORMAT;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/* Ensure that subnqn is null terminated */
  	end = memchr(data->subnqn, '\0', SPDK_NVMF_NQN_MAX_LEN + 1);
  	if (!end) {
  		SPDK_ERRLOG("Connect SUBNQN is not null terminated\n");
  		SPDK_NVMF_INVALID_CONNECT_DATA(rsp, subnqn);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  	subnqn = data->subnqn;
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "  subnqn: \"%s\"\n", subnqn);
  
  	subsystem = spdk_nvmf_tgt_find_subsystem(tgt, subnqn);
  	if (subsystem == NULL) {
  		SPDK_ERRLOG("Could not find subsystem '%s'\n", subnqn);
  		SPDK_NVMF_INVALID_CONNECT_DATA(rsp, subnqn);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if ((subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE) ||
  	    (subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSING) ||
  	    (subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED) ||
  	    (subsystem->state == SPDK_NVMF_SUBSYSTEM_DEACTIVATING)) {
  		SPDK_ERRLOG("Subsystem '%s' is not ready\n", subnqn);
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVMF_FABRIC_SC_CONTROLLER_BUSY;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/* Ensure that hostnqn is null terminated */
  	end = memchr(data->hostnqn, '\0', SPDK_NVMF_NQN_MAX_LEN + 1);
  	if (!end) {
  		SPDK_ERRLOG("Connect HOSTNQN is not null terminated\n");
  		SPDK_NVMF_INVALID_CONNECT_DATA(rsp, hostnqn);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  	hostnqn = data->hostnqn;
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "  hostnqn: \"%s\"\n", hostnqn);
  
  	if (!spdk_nvmf_subsystem_host_allowed(subsystem, hostnqn)) {
  		SPDK_ERRLOG("Subsystem '%s' does not allow host '%s'\n", subnqn, hostnqn);
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_HOST;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (spdk_nvmf_qpair_get_listen_trid(qpair, &listen_trid)) {
  		SPDK_ERRLOG("Subsystem '%s' is unable to enforce access control due to an internal error.\n",
  			    subnqn);
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_HOST;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (!spdk_nvmf_subsystem_listener_allowed(subsystem, &listen_trid)) {
  		SPDK_ERRLOG("Subsystem '%s' does not allow host '%s' to connect at this address.\n", subnqn,
  			    hostnqn);
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_HOST;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/*
  	 * SQSIZE is a 0-based value, so it must be at least 1 (minimum queue depth is 2) and
  	 * strictly less than max_aq_depth (admin queues) or max_queue_depth (io queues).
  	 */
  	if (cmd->sqsize == 0) {
  		SPDK_ERRLOG("Invalid SQSIZE = 0\n");
  		SPDK_NVMF_INVALID_CONNECT_CMD(rsp, sqsize);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (cmd->qid == 0) {
  		if (cmd->sqsize >= transport->opts.max_aq_depth) {
  			SPDK_ERRLOG("Invalid SQSIZE for admin queue %u (min 1, max %u)\n",
  				    cmd->sqsize, transport->opts.max_aq_depth - 1);
  			SPDK_NVMF_INVALID_CONNECT_CMD(rsp, sqsize);
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		}
  	} else if (cmd->sqsize >= transport->opts.max_queue_depth) {
  		SPDK_ERRLOG("Invalid SQSIZE %u (min 1, max %u)\n",
  			    cmd->sqsize, transport->opts.max_queue_depth - 1);
  		SPDK_NVMF_INVALID_CONNECT_CMD(rsp, sqsize);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	qpair->sq_head_max = cmd->sqsize;
  	qpair->qid = cmd->qid;
  
  	if (spdk_nvmf_transport_qpair_set_sqsize(qpair)) {
  		SPDK_ERRLOG("Can not create SQSIZE %u for qpair=%p\n", cmd->sqsize, qpair);
  		rsp->status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (0 == qpair->qid) {
  		qpair->group->stat.admin_qpairs++;
  	} else {
  		qpair->group->stat.io_qpairs++;
  	}
  
  	if (cmd->qid == 0) {
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Connect Admin Queue for controller ID 0x%x\n", data->cntlid);
  
  		if (data->cntlid != 0xFFFF) {
  			/* This NVMf target only supports dynamic mode. */
  			SPDK_ERRLOG("The NVMf target only supports dynamic mode (CNTLID = 0x%x).\n", data->cntlid);
  			SPDK_NVMF_INVALID_CONNECT_DATA(rsp, cntlid);
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		}
  
  		/* Establish a new ctrlr */
  		ctrlr = spdk_nvmf_ctrlr_create(subsystem, req, cmd, data);
  		if (!ctrlr) {
  			SPDK_ERRLOG("spdk_nvmf_ctrlr_create() failed\n");
  			rsp->status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		} else {
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS;
  		}
  	} else {
  		spdk_thread_send_msg(subsystem->thread, _spdk_nvmf_ctrlr_add_io_qpair, req);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS;
  	}
  }
  
  static uint64_t
  nvmf_prop_get_cap(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	return ctrlr->vcprop.cap.raw;
  }
  
  static uint64_t
  nvmf_prop_get_vs(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	return ctrlr->vcprop.vs.raw;
  }
  
  static uint64_t
  nvmf_prop_get_cc(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	return ctrlr->vcprop.cc.raw;
  }
  
  static bool
  nvmf_prop_set_cc(struct spdk_nvmf_ctrlr *ctrlr, uint64_t value)
  {
  	union spdk_nvme_cc_register cc, diff;
  
  	cc.raw = (uint32_t)value;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "cur CC: 0x%08x\n", ctrlr->vcprop.cc.raw);
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "new CC: 0x%08x\n", cc.raw);
  
  	/*
  	 * Calculate which bits changed between the current and new CC.
  	 * Mark each bit as 0 once it is handled to determine if any unhandled bits were changed.
  	 */
  	diff.raw = cc.raw ^ ctrlr->vcprop.cc.raw;
  
  	if (diff.bits.en) {
  		if (cc.bits.en) {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Property Set CC Enable!\n");
  			ctrlr->vcprop.cc.bits.en = 1;
  			ctrlr->vcprop.csts.bits.rdy = 1;
  		} else {
  			SPDK_ERRLOG("CC.EN transition from 1 to 0 (reset) not implemented!\n");
  
  		}
  		diff.bits.en = 0;
  	}
  
  	if (diff.bits.shn) {
  		if (cc.bits.shn == SPDK_NVME_SHN_NORMAL ||
  		    cc.bits.shn == SPDK_NVME_SHN_ABRUPT) {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Property Set CC Shutdown %u%ub!\n",
  				      cc.bits.shn >> 1, cc.bits.shn & 1);
  			ctrlr->vcprop.cc.bits.shn = cc.bits.shn;
  			ctrlr->vcprop.cc.bits.en = 0;
  			ctrlr->vcprop.csts.bits.rdy = 0;
  			ctrlr->vcprop.csts.bits.shst = SPDK_NVME_SHST_COMPLETE;
  		} else if (cc.bits.shn == 0) {
  			ctrlr->vcprop.cc.bits.shn = 0;
  		} else {
  			SPDK_ERRLOG("Prop Set CC: Invalid SHN value %u%ub\n",
  				    cc.bits.shn >> 1, cc.bits.shn & 1);
  			return false;
  		}
  		diff.bits.shn = 0;
  	}
  
  	if (diff.bits.iosqes) {
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Prop Set IOSQES = %u (%u bytes)\n",
  			      cc.bits.iosqes, 1u << cc.bits.iosqes);
  		ctrlr->vcprop.cc.bits.iosqes = cc.bits.iosqes;
  		diff.bits.iosqes = 0;
  	}
  
  	if (diff.bits.iocqes) {
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Prop Set IOCQES = %u (%u bytes)\n",
  			      cc.bits.iocqes, 1u << cc.bits.iocqes);
  		ctrlr->vcprop.cc.bits.iocqes = cc.bits.iocqes;
  		diff.bits.iocqes = 0;
  	}
  
  	if (diff.raw != 0) {
  		SPDK_ERRLOG("Prop Set CC toggled reserved bits 0x%x!\n", diff.raw);
  		return false;
  	}
  
  	return true;
  }
  
  static uint64_t
  nvmf_prop_get_csts(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	return ctrlr->vcprop.csts.raw;
  }
  
  struct nvmf_prop {
  	uint32_t ofst;
  	uint8_t size;
  	char name[11];
  	uint64_t (*get_cb)(struct spdk_nvmf_ctrlr *ctrlr);
  	bool (*set_cb)(struct spdk_nvmf_ctrlr *ctrlr, uint64_t value);
  };
  
  #define PROP(field, size, get_cb, set_cb) \
  	{ \
  		offsetof(struct spdk_nvme_registers, field), \
  		SPDK_NVMF_PROP_SIZE_##size, \
  		#field, \
  		get_cb, set_cb \
  	}
  
  static const struct nvmf_prop nvmf_props[] = {
  	PROP(cap,  8, nvmf_prop_get_cap,  NULL),
  	PROP(vs,   4, nvmf_prop_get_vs,   NULL),
  	PROP(cc,   4, nvmf_prop_get_cc,   nvmf_prop_set_cc),
  	PROP(csts, 4, nvmf_prop_get_csts, NULL),
  };
  
  static const struct nvmf_prop *
  find_prop(uint32_t ofst)
  {
  	size_t i;
  
  	for (i = 0; i < SPDK_COUNTOF(nvmf_props); i++) {
  		const struct nvmf_prop *prop = &nvmf_props[i];
  
  		if (prop->ofst == ofst) {
  			return prop;
  		}
  	}
  
  	return NULL;
  }
  
  static int
  spdk_nvmf_property_get(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvmf_fabric_prop_get_cmd *cmd = &req->cmd->prop_get_cmd;
  	struct spdk_nvmf_fabric_prop_get_rsp *response = &req->rsp->prop_get_rsp;
  	const struct nvmf_prop *prop;
  
  	response->status.sc = 0;
  	response->value.u64 = 0;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "size %d, offset 0x%x\n",
  		      cmd->attrib.size, cmd->ofst);
  
  	if (cmd->attrib.size != SPDK_NVMF_PROP_SIZE_4 &&
  	    cmd->attrib.size != SPDK_NVMF_PROP_SIZE_8) {
  		SPDK_ERRLOG("Invalid size value %d\n", cmd->attrib.size);
  		response->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		response->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_PARAM;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	prop = find_prop(cmd->ofst);
  	if (prop == NULL || prop->get_cb == NULL) {
  		/* Reserved properties return 0 when read */
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "name: %s\n", prop->name);
  	if (cmd->attrib.size != prop->size) {
  		SPDK_ERRLOG("offset 0x%x size mismatch: cmd %u, prop %u\n",
  			    cmd->ofst, cmd->attrib.size, prop->size);
  		response->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		response->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_PARAM;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	response->value.u64 = prop->get_cb(ctrlr);
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "response value: 0x%" PRIx64 "\n", response->value.u64);
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_property_set(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvmf_fabric_prop_set_cmd *cmd = &req->cmd->prop_set_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  	const struct nvmf_prop *prop;
  	uint64_t value;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "size %d, offset 0x%x, value 0x%" PRIx64 "\n",
  		      cmd->attrib.size, cmd->ofst, cmd->value.u64);
  
  	prop = find_prop(cmd->ofst);
  	if (prop == NULL || prop->set_cb == NULL) {
  		SPDK_ERRLOG("Invalid offset 0x%x\n", cmd->ofst);
  		response->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		response->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_PARAM;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "name: %s\n", prop->name);
  	if (cmd->attrib.size != prop->size) {
  		SPDK_ERRLOG("offset 0x%x size mismatch: cmd %u, prop %u\n",
  			    cmd->ofst, cmd->attrib.size, prop->size);
  		response->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		response->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_PARAM;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	value = cmd->value.u64;
  	if (prop->size == SPDK_NVMF_PROP_SIZE_4) {
  		value = (uint32_t)value;
  	}
  
  	if (!prop->set_cb(ctrlr, value)) {
  		SPDK_ERRLOG("prop set_cb failed\n");
  		response->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		response->status.sc = SPDK_NVMF_FABRIC_SC_INVALID_PARAM;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_arbitration(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Arbitration (cdw11 = 0x%0x)\n", cmd->cdw11);
  
  	ctrlr->feat.arbitration.raw = cmd->cdw11;
  	ctrlr->feat.arbitration.bits.reserved = 0;
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_power_management(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Power Management (cdw11 = 0x%0x)\n", cmd->cdw11);
  
  	/* Only PS = 0 is allowed, since we report NPSS = 0 */
  	if (cmd->cdw11_bits.feat_power_management.bits.ps != 0) {
  		SPDK_ERRLOG("Invalid power state %u\n", cmd->cdw11_bits.feat_power_management.bits.ps);
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	ctrlr->feat.power_management.raw = cmd->cdw11;
  	ctrlr->feat.power_management.bits.reserved = 0;
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static bool
  temp_threshold_opts_valid(const union spdk_nvme_feat_temperature_threshold *opts)
  {
  	/*
  	 * Valid TMPSEL values:
  	 *  0000b - 1000b: temperature sensors
  	 *  1111b: set all implemented temperature sensors
  	 */
  	if (opts->bits.tmpsel >= 9 && opts->bits.tmpsel != 15) {
  		/* 1001b - 1110b: reserved */
  		SPDK_ERRLOG("Invalid TMPSEL %u\n", opts->bits.tmpsel);
  		return false;
  	}
  
  	/*
  	 * Valid THSEL values:
  	 *  00b: over temperature threshold
  	 *  01b: under temperature threshold
  	 */
  	if (opts->bits.thsel > 1) {
  		/* 10b - 11b: reserved */
  		SPDK_ERRLOG("Invalid THSEL %u\n", opts->bits.thsel);
  		return false;
  	}
  
  	return true;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_temperature_threshold(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Temperature Threshold (cdw11 = 0x%0x)\n", cmd->cdw11);
  
  	if (!temp_threshold_opts_valid(&cmd->cdw11_bits.feat_temp_threshold)) {
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/* TODO: no sensors implemented - ignore new values */
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_get_features_temperature_threshold(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Get Features - Temperature Threshold (cdw11 = 0x%0x)\n", cmd->cdw11);
  
  	if (!temp_threshold_opts_valid(&cmd->cdw11_bits.feat_temp_threshold)) {
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/* TODO: no sensors implemented - return 0 for all thresholds */
  	rsp->cdw0 = 0;
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_error_recovery(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Error Recovery (cdw11 = 0x%0x)\n", cmd->cdw11);
  
  	if (cmd->cdw11_bits.feat_error_recovery.bits.dulbe) {
  		/*
  		 * Host is not allowed to set this bit, since we don't advertise it in
  		 * Identify Namespace.
  		 */
  		SPDK_ERRLOG("Host set unsupported DULBE bit\n");
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	ctrlr->feat.error_recovery.raw = cmd->cdw11;
  	ctrlr->feat.error_recovery.bits.reserved = 0;
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_volatile_write_cache(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Volatile Write Cache (cdw11 = 0x%0x)\n", cmd->cdw11);
  
  	ctrlr->feat.volatile_write_cache.raw = cmd->cdw11;
  	ctrlr->feat.volatile_write_cache.bits.reserved = 0;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Volatile Write Cache %s\n",
  		      ctrlr->feat.volatile_write_cache.bits.wce ? "Enabled" : "Disabled");
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_write_atomicity(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Write Atomicity (cdw11 = 0x%0x)\n", cmd->cdw11);
  
  	ctrlr->feat.write_atomicity.raw = cmd->cdw11;
  	ctrlr->feat.write_atomicity.bits.reserved = 0;
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_host_identifier(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  
  	SPDK_ERRLOG("Set Features - Host Identifier not allowed\n");
  	response->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_get_features_host_identifier(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Get Features - Host Identifier\n");
  
  	if (!cmd->cdw11_bits.feat_host_identifier.bits.exhid) {
  		/* NVMe over Fabrics requires EXHID=1 (128-bit/16-byte host ID) */
  		SPDK_ERRLOG("Get Features - Host Identifier with EXHID=0 not allowed\n");
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (req->data == NULL || req->length < sizeof(ctrlr->hostid)) {
  		SPDK_ERRLOG("Invalid data buffer for Get Features - Host Identifier\n");
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	spdk_uuid_copy((struct spdk_uuid *)req->data, &ctrlr->hostid);
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_get_features_reservation_notification_mask(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_ns *ns;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "get Features - Reservation Notificaton Mask\n");
  
  	if (cmd->nsid == 0xffffffffu) {
  		SPDK_ERRLOG("get Features - Invalid Namespace ID\n");
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	ns = _spdk_nvmf_subsystem_get_ns(ctrlr->subsys, cmd->nsid);
  	if (ns == NULL) {
  		SPDK_ERRLOG("Set Features - Invalid Namespace ID\n");
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  	rsp->cdw0 = ns->mask;
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_reservation_notification_mask(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvmf_subsystem *subsystem = ctrlr->subsys;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_ns *ns;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Reservation Notificaton Mask\n");
  
  	if (cmd->nsid == 0xffffffffu) {
  		for (ns = spdk_nvmf_subsystem_get_first_ns(subsystem); ns != NULL;
  		     ns = spdk_nvmf_subsystem_get_next_ns(subsystem, ns)) {
  			ns->mask = cmd->cdw11;
  		}
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	ns = _spdk_nvmf_subsystem_get_ns(ctrlr->subsys, cmd->nsid);
  	if (ns == NULL) {
  		SPDK_ERRLOG("Set Features - Invalid Namespace ID\n");
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  	ns->mask = cmd->cdw11;
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_get_features_reservation_persistence(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_ns *ns;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Get Features - Reservation Persistence\n");
  
  	ns = _spdk_nvmf_subsystem_get_ns(ctrlr->subsys, cmd->nsid);
  	/* NSID with 0xffffffffu also included */
  	if (ns == NULL) {
  		SPDK_ERRLOG("Get Features - Invalid Namespace ID\n");
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	response->cdw0 = ns->ptpl_activated;
  
  	response->status.sct = SPDK_NVME_SCT_GENERIC;
  	response->status.sc = SPDK_NVME_SC_SUCCESS;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_reservation_persistence(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_ns *ns;
  	bool ptpl;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Reservation Persistence\n");
  
  	ns = _spdk_nvmf_subsystem_get_ns(ctrlr->subsys, cmd->nsid);
  	ptpl = cmd->cdw11_bits.feat_rsv_persistence.bits.ptpl;
  
  	if (cmd->nsid != 0xffffffffu && ns && ns->ptpl_file) {
  		ns->ptpl_activated = ptpl;
  	} else if (cmd->nsid == 0xffffffffu) {
  		for (ns = spdk_nvmf_subsystem_get_first_ns(ctrlr->subsys); ns && ns->ptpl_file;
  		     ns = spdk_nvmf_subsystem_get_next_ns(ctrlr->subsys, ns)) {
  			ns->ptpl_activated = ptpl;
  		}
  	} else {
  		SPDK_ERRLOG("Set Features - Invalid Namespace ID or Reservation Configuration\n");
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/* TODO: Feature not changeable for now */
  	response->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  	response->status.sc = SPDK_NVME_SC_FEATURE_ID_NOT_SAVEABLE;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_keep_alive_timer(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Keep Alive Timer (%u ms)\n", cmd->cdw11);
  
  	/*
  	 * if attempts to disable keep alive by setting kato to 0h
  	 * a status value of keep alive invalid shall be returned
  	 */
  	if (cmd->cdw11_bits.feat_keep_alive_timer.bits.kato == 0) {
  		rsp->status.sc = SPDK_NVME_SC_KEEP_ALIVE_INVALID;
  	} else if (cmd->cdw11_bits.feat_keep_alive_timer.bits.kato < MIN_KEEP_ALIVE_TIMEOUT_IN_MS) {
  		ctrlr->feat.keep_alive_timer.bits.kato = MIN_KEEP_ALIVE_TIMEOUT_IN_MS;
  	} else {
  		/* round up to milliseconds */
  		ctrlr->feat.keep_alive_timer.bits.kato = spdk_divide_round_up(
  					cmd->cdw11_bits.feat_keep_alive_timer.bits.kato,
  					KAS_DEFAULT_VALUE * KAS_TIME_UNIT_IN_MS) *
  				KAS_DEFAULT_VALUE * KAS_TIME_UNIT_IN_MS;
  	}
  
  	/*
  	 * if change the keep alive timeout value successfully
  	 * update the keep alive poller.
  	 */
  	if (cmd->cdw11_bits.feat_keep_alive_timer.bits.kato != 0) {
  		if (ctrlr->keep_alive_poller != NULL) {
  			spdk_poller_unregister(&ctrlr->keep_alive_poller);
  		}
  		ctrlr->keep_alive_poller = spdk_poller_register(spdk_nvmf_ctrlr_keep_alive_poll, ctrlr,
  					   ctrlr->feat.keep_alive_timer.bits.kato * 1000);
  	}
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Keep Alive Timer set to %u ms\n",
  		      ctrlr->feat.keep_alive_timer.bits.kato);
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_number_of_queues(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  	uint32_t count;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Number of Queues, cdw11 0x%x\n",
  		      req->cmd->nvme_cmd.cdw11);
  
  	count = spdk_bit_array_count_set(ctrlr->qpair_mask);
  	/* verify that the controller is ready to process commands */
  	if (count > 1) {
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Queue pairs already active!\n");
  		rsp->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  	} else {
  		/*
  		 * Ignore the value requested by the host -
  		 * always return the pre-configured value based on max_qpairs_allowed.
  		 */
  		rsp->cdw0 = ctrlr->feat.number_of_queues.raw;
  	}
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_set_features_async_event_configuration(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Set Features - Async Event Configuration, cdw11 0x%08x\n",
  		      cmd->cdw11);
  	ctrlr->feat.async_event_configuration.raw = cmd->cdw11;
  	ctrlr->feat.async_event_configuration.bits.reserved = 0;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_async_event_request(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_subsystem_poll_group *sgroup;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Async Event Request\n");
  
  	/* Only one asynchronous event is supported for now */
  	if (ctrlr->aer_req != NULL) {
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "AERL exceeded\n");
  		rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  		rsp->status.sc = SPDK_NVME_SC_ASYNC_EVENT_REQUEST_LIMIT_EXCEEDED;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (ctrlr->notice_event.bits.async_event_type ==
  	    SPDK_NVME_ASYNC_EVENT_TYPE_NOTICE) {
  		rsp->cdw0 = ctrlr->notice_event.raw;
  		ctrlr->notice_event.raw = 0;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (ctrlr->reservation_event.bits.async_event_type ==
  	    SPDK_NVME_ASYNC_EVENT_TYPE_IO) {
  		rsp->cdw0 = ctrlr->reservation_event.raw;
  		ctrlr->reservation_event.raw = 0;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/* AER cmd is an exception */
  	sgroup = &req->qpair->group->sgroups[ctrlr->subsys->id];
  	sgroup->io_outstanding--;
  
  	ctrlr->aer_req = req;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS;
  }
  
  static void
  spdk_nvmf_get_firmware_slot_log_page(void *buffer, uint64_t offset, uint32_t length)
  {
  	struct spdk_nvme_firmware_page fw_page;
  	size_t copy_len;
  
  	memset(&fw_page, 0, sizeof(fw_page));
  	fw_page.afi.active_slot = 1;
  	fw_page.afi.next_reset_slot = 0;
  	spdk_strcpy_pad(fw_page.revision[0], FW_VERSION, sizeof(fw_page.revision[0]), ' ');
  
  	if (offset < sizeof(fw_page)) {
  		copy_len = spdk_min(sizeof(fw_page) - offset, length);
  		if (copy_len > 0) {
  			memcpy(buffer, (const char *)&fw_page + offset, copy_len);
  		}
  	}
  }
  
  void
  spdk_nvmf_ctrlr_ns_changed(struct spdk_nvmf_ctrlr *ctrlr, uint32_t nsid)
  {
  	uint16_t max_changes = SPDK_COUNTOF(ctrlr->changed_ns_list.ns_list);
  	uint16_t i;
  	bool found = false;
  
  	for (i = 0; i < ctrlr->changed_ns_list_count; i++) {
  		if (ctrlr->changed_ns_list.ns_list[i] == nsid) {
  			/* nsid is already in the list */
  			found = true;
  			break;
  		}
  	}
  
  	if (!found) {
  		if (ctrlr->changed_ns_list_count == max_changes) {
  			/* Out of space - set first entry to FFFFFFFFh and zero-fill the rest. */
  			ctrlr->changed_ns_list.ns_list[0] = 0xFFFFFFFFu;
  			for (i = 1; i < max_changes; i++) {
  				ctrlr->changed_ns_list.ns_list[i] = 0;
  			}
  		} else {
  			ctrlr->changed_ns_list.ns_list[ctrlr->changed_ns_list_count++] = nsid;
  		}
  	}
  }
  
  static void
  spdk_nvmf_get_changed_ns_list_log_page(struct spdk_nvmf_ctrlr *ctrlr,
  				       void *buffer, uint64_t offset, uint32_t length)
  {
  	size_t copy_length;
  
  	if (offset < sizeof(ctrlr->changed_ns_list)) {
  		copy_length = spdk_min(length, sizeof(ctrlr->changed_ns_list) - offset);
  		if (copy_length) {
  			memcpy(buffer, (char *)&ctrlr->changed_ns_list + offset, copy_length);
  		}
  	}
  
  	/* Clear log page each time it is read */
  	ctrlr->changed_ns_list_count = 0;
  	memset(&ctrlr->changed_ns_list, 0, sizeof(ctrlr->changed_ns_list));
  }
  
  /* The structure can be modified if we provide support for other commands in future */
  static const struct spdk_nvme_cmds_and_effect_log_page g_cmds_and_effect_log_page = {
  	.admin_cmds_supported = {
  		/* CSUPP, LBCC, NCC, NIC, CCC, CSE */
  		/* Get Log Page */
  		[SPDK_NVME_OPC_GET_LOG_PAGE]		= {1, 0, 0, 0, 0, 0, 0, 0},
  		/* Identify */
  		[SPDK_NVME_OPC_IDENTIFY]		= {1, 0, 0, 0, 0, 0, 0, 0},
  		/* Abort */
  		[SPDK_NVME_OPC_ABORT]			= {1, 0, 0, 0, 0, 0, 0, 0},
  		/* Set Features */
  		[SPDK_NVME_OPC_SET_FEATURES]		= {1, 0, 0, 0, 0, 0, 0, 0},
  		/* Get Features */
  		[SPDK_NVME_OPC_GET_FEATURES]		= {1, 0, 0, 0, 0, 0, 0, 0},
  		/* Async Event Request */
  		[SPDK_NVME_OPC_ASYNC_EVENT_REQUEST]	= {1, 0, 0, 0, 0, 0, 0, 0},
  		/* Keep Alive */
  		[SPDK_NVME_OPC_KEEP_ALIVE]		= {1, 0, 0, 0, 0, 0, 0, 0},
  	},
  	.io_cmds_supported = {
  		/* FLUSH */
  		[SPDK_NVME_OPC_FLUSH]			= {1, 1, 0, 0, 0, 0, 0, 0},
  		/* WRITE */
  		[SPDK_NVME_OPC_WRITE]			= {1, 1, 0, 0, 0, 0, 0, 0},
  		/* READ */
  		[SPDK_NVME_OPC_READ]			= {1, 0, 0, 0, 0, 0, 0, 0},
  		/* WRITE ZEROES */
  		[SPDK_NVME_OPC_WRITE_ZEROES]		= {1, 1, 0, 0, 0, 0, 0, 0},
  		/* DATASET MANAGEMENT */
  		[SPDK_NVME_OPC_DATASET_MANAGEMENT]	= {1, 1, 0, 0, 0, 0, 0, 0},
  	},
  };
  
  static void
  spdk_nvmf_get_cmds_and_effects_log_page(void *buffer,
  					uint64_t offset, uint32_t length)
  {
  	uint32_t page_size = sizeof(struct spdk_nvme_cmds_and_effect_log_page);
  	size_t copy_len = 0;
  	size_t zero_len = length;
  
  	if (offset < page_size) {
  		copy_len = spdk_min(page_size - offset, length);
  		zero_len -= copy_len;
  		memcpy(buffer, (char *)(&g_cmds_and_effect_log_page) + offset, copy_len);
  	}
  
  	if (zero_len) {
  		memset((char *)buffer + copy_len, 0, zero_len);
  	}
  }
  
  static void
  spdk_nvmf_get_reservation_notification_log_page(struct spdk_nvmf_ctrlr *ctrlr,
  		void *data, uint64_t offset, uint32_t length)
  {
  	uint32_t unit_log_len, avail_log_len, next_pos, copy_len;
  	struct spdk_nvmf_reservation_log *log, *log_tmp;
  	uint8_t *buf = data;
  
  	unit_log_len = sizeof(struct spdk_nvme_reservation_notification_log);
  	/* No available log, return 1 zeroed log page */
  	if (!ctrlr->num_avail_log_pages) {
  		memset(buf, 0, spdk_min(length, unit_log_len));
  		return;
  	}
  
  	avail_log_len = ctrlr->num_avail_log_pages * unit_log_len;
  	if (offset >= avail_log_len) {
  		return;
  	}
  
  	next_pos = copy_len = 0;
  	TAILQ_FOREACH_SAFE(log, &ctrlr->log_head, link, log_tmp) {
  		TAILQ_REMOVE(&ctrlr->log_head, log, link);
  		ctrlr->num_avail_log_pages--;
  
  		next_pos += unit_log_len;
  		if (next_pos > offset) {
  			copy_len = spdk_min(next_pos - offset, length);
  			memcpy(buf, &log->log, copy_len);
  			length -= copy_len;
  			offset += copy_len;
  			buf += copy_len;
  		}
  		free(log);
  
  		if (length == 0) {
  			break;
  		}
  	}
  	return;
  }
  
  static int
  spdk_nvmf_ctrlr_get_log_page(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvmf_subsystem *subsystem = ctrlr->subsys;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  	uint64_t offset, len;
  	uint32_t numdl, numdu;
  	uint8_t lid;
  
  	if (req->data == NULL) {
  		SPDK_ERRLOG("get log command with no buffer\n");
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	offset = (uint64_t)cmd->cdw12 | ((uint64_t)cmd->cdw13 << 32);
  	if (offset & 3) {
  		SPDK_ERRLOG("Invalid log page offset 0x%" PRIx64 "\n", offset);
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	numdl = cmd->cdw10_bits.get_log_page.numdl;
  	numdu = cmd->cdw11_bits.get_log_page.numdu;
  	len = ((numdu << 16) + numdl + (uint64_t)1) * 4;
  	if (len > req->length) {
  		SPDK_ERRLOG("Get log page: len (%" PRIu64 ") > buf size (%u)\n",
  			    len, req->length);
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	lid = cmd->cdw10_bits.get_log_page.lid;
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Get log page: LID=0x%02X offset=0x%" PRIx64 " len=0x%" PRIx64 "\n",
  		      lid, offset, len);
  
  	if (subsystem->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) {
  		switch (lid) {
  		case SPDK_NVME_LOG_DISCOVERY:
  			spdk_nvmf_get_discovery_log_page(subsystem->tgt, ctrlr->hostnqn, req->iov, req->iovcnt, offset,
  							 len);
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		default:
  			goto invalid_log_page;
  		}
  	} else {
  		switch (lid) {
  		case SPDK_NVME_LOG_ERROR:
  		case SPDK_NVME_LOG_HEALTH_INFORMATION:
  			/* TODO: actually fill out log page data */
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		case SPDK_NVME_LOG_FIRMWARE_SLOT:
  			spdk_nvmf_get_firmware_slot_log_page(req->data, offset, len);
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		case SPDK_NVME_LOG_COMMAND_EFFECTS_LOG:
  			spdk_nvmf_get_cmds_and_effects_log_page(req->data, offset, len);
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		case SPDK_NVME_LOG_CHANGED_NS_LIST:
  			spdk_nvmf_get_changed_ns_list_log_page(ctrlr, req->data, offset, len);
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		case SPDK_NVME_LOG_RESERVATION_NOTIFICATION:
  			spdk_nvmf_get_reservation_notification_log_page(ctrlr, req->data, offset, len);
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		default:
  			goto invalid_log_page;
  		}
  	}
  
  invalid_log_page:
  	SPDK_ERRLOG("Unsupported Get Log Page 0x%02X\n", lid);
  	response->status.sct = SPDK_NVME_SCT_GENERIC;
  	response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_identify_ns(struct spdk_nvmf_ctrlr *ctrlr,
  			    struct spdk_nvme_cmd *cmd,
  			    struct spdk_nvme_cpl *rsp,
  			    struct spdk_nvme_ns_data *nsdata)
  {
  	struct spdk_nvmf_subsystem *subsystem = ctrlr->subsys;
  	struct spdk_nvmf_ns *ns;
  	uint32_t max_num_blocks;
  
  	if (cmd->nsid == 0 || cmd->nsid > subsystem->max_nsid) {
  		SPDK_ERRLOG("Identify Namespace for invalid NSID %u\n", cmd->nsid);
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_NAMESPACE_OR_FORMAT;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	ns = _spdk_nvmf_subsystem_get_ns(subsystem, cmd->nsid);
  	if (ns == NULL || ns->bdev == NULL) {
  		/*
  		 * Inactive namespaces should return a zero filled data structure.
  		 * The data buffer is already zeroed by spdk_nvmf_ctrlr_process_admin_cmd(),
  		 * so we can just return early here.
  		 */
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Identify Namespace for inactive NSID %u\n", cmd->nsid);
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_SUCCESS;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	spdk_nvmf_bdev_ctrlr_identify_ns(ns, nsdata, ctrlr->dif_insert_or_strip);
  
  	/* Due to bug in the Linux kernel NVMe driver we have to set noiob no larger than mdts */
  	max_num_blocks = ctrlr->admin_qpair->transport->opts.max_io_size /
  			 (1U << nsdata->lbaf[nsdata->flbas.format].lbads);
  	if (nsdata->noiob > max_num_blocks) {
  		nsdata->noiob = max_num_blocks;
  	}
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_identify_ctrlr(struct spdk_nvmf_ctrlr *ctrlr, struct spdk_nvme_ctrlr_data *cdata)
  {
  	struct spdk_nvmf_subsystem *subsystem = ctrlr->subsys;
  	struct spdk_nvmf_transport *transport = ctrlr->admin_qpair->transport;
  
  	/*
  	 * Common fields for discovery and NVM subsystems
  	 */
  	spdk_strcpy_pad(cdata->fr, FW_VERSION, sizeof(cdata->fr), ' ');
  	assert((transport->opts.max_io_size % 4096) == 0);
  	cdata->mdts = spdk_u32log2(transport->opts.max_io_size / 4096);
  	cdata->cntlid = ctrlr->cntlid;
  	cdata->ver = ctrlr->vcprop.vs;
  	cdata->lpa.edlp = 1;
  	cdata->elpe = 127;
  	cdata->maxcmd = transport->opts.max_queue_depth;
  	cdata->sgls.supported = 1;
  	cdata->sgls.keyed_sgl = 1;
  	cdata->sgls.sgl_offset = 1;
  	spdk_strcpy_pad(cdata->subnqn, subsystem->subnqn, sizeof(cdata->subnqn), '\0');
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "ctrlr data: maxcmd 0x%x\n", cdata->maxcmd);
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "sgls data: 0x%x\n", from_le32(&cdata->sgls));
  
  	/*
  	 * NVM subsystem fields (reserved for discovery subsystems)
  	 */
  	if (subsystem->subtype == SPDK_NVMF_SUBTYPE_NVME) {
  		spdk_strcpy_pad(cdata->mn, spdk_nvmf_subsystem_get_mn(subsystem), sizeof(cdata->mn), ' ');
  		spdk_strcpy_pad(cdata->sn, spdk_nvmf_subsystem_get_sn(subsystem), sizeof(cdata->sn), ' ');
  		cdata->kas = KAS_DEFAULT_VALUE;
  
  		cdata->rab = 6;
  		cdata->cmic.multi_port = 1;
  		cdata->cmic.multi_host = 1;
  		cdata->oaes.ns_attribute_notices = 1;
  		cdata->ctratt.host_id_exhid_supported = 1;
  		cdata->aerl = 0;
  		cdata->frmw.slot1_ro = 1;
  		cdata->frmw.num_slots = 1;
  
  		cdata->lpa.celp = 1; /* Command Effects log page supported */
  
  		cdata->sqes.min = 6;
  		cdata->sqes.max = 6;
  		cdata->cqes.min = 4;
  		cdata->cqes.max = 4;
  		cdata->nn = subsystem->max_nsid;
  		cdata->vwc.present = 1;
  		cdata->vwc.flush_broadcast = SPDK_NVME_FLUSH_BROADCAST_NOT_SUPPORTED;
  
  		cdata->nvmf_specific.ioccsz = sizeof(struct spdk_nvme_cmd) / 16;
  		cdata->nvmf_specific.iorcsz = sizeof(struct spdk_nvme_cpl) / 16;
  		cdata->nvmf_specific.icdoff = 0; /* offset starts directly after SQE */
  		cdata->nvmf_specific.ctrattr.ctrlr_model = SPDK_NVMF_CTRLR_MODEL_DYNAMIC;
  		/* The RDMA transport supports up to SPDK_NVMF_MAX_SGL_ENTRIES descriptors. */
  		if (transport->ops->type == SPDK_NVME_TRANSPORT_RDMA) {
  			cdata->nvmf_specific.msdbd = SPDK_NVMF_MAX_SGL_ENTRIES;
  		} else {
  			cdata->nvmf_specific.msdbd = 1;
  		}
  
  		/* TODO: this should be set by the transport */
  		/* Disable in-capsule data transfer for RDMA controller when dif_insert_or_strip is enabled
  		   since in-capsule data only works with NVME drives that support SGL memory layout */
  		if (!(transport->ops->type == SPDK_NVME_TRANSPORT_RDMA && ctrlr->dif_insert_or_strip)) {
  			cdata->nvmf_specific.ioccsz += transport->opts.in_capsule_data_size / 16;
  		}
  
  		cdata->oncs.dsm = spdk_nvmf_ctrlr_dsm_supported(ctrlr);
  		cdata->oncs.write_zeroes = spdk_nvmf_ctrlr_write_zeroes_supported(ctrlr);
  		cdata->oncs.reservations = 1;
  
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "ext ctrlr data: ioccsz 0x%x\n",
  			      cdata->nvmf_specific.ioccsz);
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "ext ctrlr data: iorcsz 0x%x\n",
  			      cdata->nvmf_specific.iorcsz);
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "ext ctrlr data: icdoff 0x%x\n",
  			      cdata->nvmf_specific.icdoff);
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "ext ctrlr data: ctrattr 0x%x\n",
  			      *(uint8_t *)&cdata->nvmf_specific.ctrattr);
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "ext ctrlr data: msdbd 0x%x\n",
  			      cdata->nvmf_specific.msdbd);
  	}
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_identify_active_ns_list(struct spdk_nvmf_subsystem *subsystem,
  					struct spdk_nvme_cmd *cmd,
  					struct spdk_nvme_cpl *rsp,
  					struct spdk_nvme_ns_list *ns_list)
  {
  	struct spdk_nvmf_ns *ns;
  	uint32_t count = 0;
  
  	if (cmd->nsid >= 0xfffffffeUL) {
  		SPDK_ERRLOG("Identify Active Namespace List with invalid NSID %u\n", cmd->nsid);
  		rsp->status.sc = SPDK_NVME_SC_INVALID_NAMESPACE_OR_FORMAT;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	for (ns = spdk_nvmf_subsystem_get_first_ns(subsystem); ns != NULL;
  	     ns = spdk_nvmf_subsystem_get_next_ns(subsystem, ns)) {
  		if (ns->opts.nsid <= cmd->nsid) {
  			continue;
  		}
  
  		ns_list->ns_list[count++] = ns->opts.nsid;
  		if (count == SPDK_COUNTOF(ns_list->ns_list)) {
  			break;
  		}
  	}
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static void
  _add_ns_id_desc(void **buf_ptr, size_t *buf_remain,
  		enum spdk_nvme_nidt type,
  		const void *data, size_t data_size)
  {
  	struct spdk_nvme_ns_id_desc *desc;
  	size_t desc_size = sizeof(*desc) + data_size;
  
  	/*
  	 * These should never fail in practice, since all valid NS ID descriptors
  	 * should be defined so that they fit in the available 4096-byte buffer.
  	 */
  	assert(data_size > 0);
  	assert(data_size <= UINT8_MAX);
  	assert(desc_size < *buf_remain);
  	if (data_size == 0 || data_size > UINT8_MAX || desc_size > *buf_remain) {
  		return;
  	}
  
  	desc = *buf_ptr;
  	desc->nidt = type;
  	desc->nidl = data_size;
  	memcpy(desc->nid, data, data_size);
  
  	*buf_ptr += desc_size;
  	*buf_remain -= desc_size;
  }
  
  static int
  spdk_nvmf_ctrlr_identify_ns_id_descriptor_list(
  	struct spdk_nvmf_subsystem *subsystem,
  	struct spdk_nvme_cmd *cmd,
  	struct spdk_nvme_cpl *rsp,
  	void *id_desc_list, size_t id_desc_list_size)
  {
  	struct spdk_nvmf_ns *ns;
  	size_t buf_remain = id_desc_list_size;
  	void *buf_ptr = id_desc_list;
  
  	ns = _spdk_nvmf_subsystem_get_ns(subsystem, cmd->nsid);
  	if (ns == NULL || ns->bdev == NULL) {
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_NAMESPACE_OR_FORMAT;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  #define ADD_ID_DESC(type, data, size) \
  	do { \
  		if (!spdk_mem_all_zero(data, size)) { \
  			_add_ns_id_desc(&buf_ptr, &buf_remain, type, data, size); \
  		} \
  	} while (0)
  
  	ADD_ID_DESC(SPDK_NVME_NIDT_EUI64, ns->opts.eui64, sizeof(ns->opts.eui64));
  	ADD_ID_DESC(SPDK_NVME_NIDT_NGUID, ns->opts.nguid, sizeof(ns->opts.nguid));
  	ADD_ID_DESC(SPDK_NVME_NIDT_UUID, &ns->opts.uuid, sizeof(ns->opts.uuid));
  
  	/*
  	 * The list is automatically 0-terminated because controller to host buffers in
  	 * admin commands always get zeroed in spdk_nvmf_ctrlr_process_admin_cmd().
  	 */
  
  #undef ADD_ID_DESC
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_identify(struct spdk_nvmf_request *req)
  {
  	uint8_t cns;
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_subsystem *subsystem = ctrlr->subsys;
  
  	if (req->data == NULL || req->length < 4096) {
  		SPDK_ERRLOG("identify command with invalid buffer\n");
  		rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  		rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	cns = cmd->cdw10_bits.identify.cns;
  
  	if (subsystem->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY &&
  	    cns != SPDK_NVME_IDENTIFY_CTRLR) {
  		/* Discovery controllers only support Identify Controller */
  		goto invalid_cns;
  	}
  
  	switch (cns) {
  	case SPDK_NVME_IDENTIFY_NS:
  		return spdk_nvmf_ctrlr_identify_ns(ctrlr, cmd, rsp, req->data);
  	case SPDK_NVME_IDENTIFY_CTRLR:
  		return spdk_nvmf_ctrlr_identify_ctrlr(ctrlr, req->data);
  	case SPDK_NVME_IDENTIFY_ACTIVE_NS_LIST:
  		return spdk_nvmf_ctrlr_identify_active_ns_list(subsystem, cmd, rsp, req->data);
  	case SPDK_NVME_IDENTIFY_NS_ID_DESCRIPTOR_LIST:
  		return spdk_nvmf_ctrlr_identify_ns_id_descriptor_list(subsystem, cmd, rsp, req->data, req->length);
  	default:
  		goto invalid_cns;
  	}
  
  invalid_cns:
  	SPDK_ERRLOG("Identify command with unsupported CNS 0x%02x\n", cns);
  	rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  	rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  
  static struct spdk_nvmf_request *
  spdk_nvmf_qpair_abort(struct spdk_nvmf_qpair *qpair, uint16_t cid)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = qpair->ctrlr;
  	struct spdk_nvmf_request *req;
  
  	if (spdk_nvmf_qpair_is_admin_queue(qpair)) {
  		if (ctrlr->aer_req && ctrlr->aer_req->cmd->nvme_cmd.cid == cid) {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Aborting AER request\n");
  			req = ctrlr->aer_req;
  			ctrlr->aer_req = NULL;
  			return req;
  		}
  	}
  
  	/* TODO: track list of outstanding requests in qpair? */
  	return NULL;
  }
  
  static void
  spdk_nvmf_ctrlr_abort_done(struct spdk_io_channel_iter *i, int status)
  {
  	struct spdk_nvmf_request *req = spdk_io_channel_iter_get_ctx(i);
  
  	spdk_nvmf_request_complete(req);
  }
  
  static void
  spdk_nvmf_ctrlr_abort_on_pg(struct spdk_io_channel_iter *i)
  {
  	struct spdk_nvmf_request *req = spdk_io_channel_iter_get_ctx(i);
  	struct spdk_io_channel *ch = spdk_io_channel_iter_get_channel(i);
  	struct spdk_nvmf_poll_group *group = spdk_io_channel_get_ctx(ch);
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	uint16_t sqid = cmd->cdw10_bits.abort.sqid;
  	struct spdk_nvmf_qpair *qpair;
  
  	TAILQ_FOREACH(qpair, &group->qpairs, link) {
  		if (qpair->ctrlr == req->qpair->ctrlr && qpair->qid == sqid) {
  			struct spdk_nvmf_request *req_to_abort;
  			uint16_t cid = cmd->cdw10_bits.abort.cid;
  
  			/* Found the qpair */
  
  			req_to_abort = spdk_nvmf_qpair_abort(qpair, cid);
  			if (req_to_abort == NULL) {
  				SPDK_DEBUGLOG(SPDK_LOG_NVMF, "cid %u not found\n", cid);
  				rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  				rsp->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  				spdk_for_each_channel_continue(i, -EINVAL);
  				return;
  			}
  
  			/* Complete the request with aborted status */
  			req_to_abort->rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
  			req_to_abort->rsp->nvme_cpl.status.sc = SPDK_NVME_SC_ABORTED_BY_REQUEST;
  			spdk_nvmf_request_complete(req_to_abort);
  
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "abort ctrlr=%p req=%p sqid=%u cid=%u successful\n",
  				      qpair->ctrlr, req_to_abort, sqid, cid);
  			rsp->cdw0 = 0; /* Command successfully aborted */
  			rsp->status.sct = SPDK_NVME_SCT_GENERIC;
  			rsp->status.sc = SPDK_NVME_SC_SUCCESS;
  			/* Return -1 for the status so the iteration across threads stops. */
  			spdk_for_each_channel_continue(i, -1);
  
  		}
  	}
  
  	spdk_for_each_channel_continue(i, 0);
  }
  
  static int
  spdk_nvmf_ctrlr_abort(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  
  	rsp->cdw0 = 1; /* Command not aborted */
  	rsp->status.sct = SPDK_NVME_SCT_COMMAND_SPECIFIC;
  	rsp->status.sc = SPDK_NVME_SC_INVALID_QUEUE_IDENTIFIER;
  
  	/* Send a message to each poll group, searching for this ctrlr, sqid, and command. */
  	spdk_for_each_channel(req->qpair->ctrlr->subsys->tgt,
  			      spdk_nvmf_ctrlr_abort_on_pg,
  			      req,
  			      spdk_nvmf_ctrlr_abort_done
  			     );
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS;
  }
  
  static int
  get_features_generic(struct spdk_nvmf_request *req, uint32_t cdw0)
  {
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  
  	rsp->cdw0 = cdw0;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  static int
  spdk_nvmf_ctrlr_get_features(struct spdk_nvmf_request *req)
  {
  	uint8_t feature;
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  
  	feature = cmd->cdw10_bits.get_features.fid;
  	switch (feature) {
  	case SPDK_NVME_FEAT_ARBITRATION:
  		return get_features_generic(req, ctrlr->feat.arbitration.raw);
  	case SPDK_NVME_FEAT_POWER_MANAGEMENT:
  		return get_features_generic(req, ctrlr->feat.power_management.raw);
  	case SPDK_NVME_FEAT_TEMPERATURE_THRESHOLD:
  		return spdk_nvmf_ctrlr_get_features_temperature_threshold(req);
  	case SPDK_NVME_FEAT_ERROR_RECOVERY:
  		return get_features_generic(req, ctrlr->feat.error_recovery.raw);
  	case SPDK_NVME_FEAT_VOLATILE_WRITE_CACHE:
  		return get_features_generic(req, ctrlr->feat.volatile_write_cache.raw);
  	case SPDK_NVME_FEAT_NUMBER_OF_QUEUES:
  		return get_features_generic(req, ctrlr->feat.number_of_queues.raw);
  	case SPDK_NVME_FEAT_WRITE_ATOMICITY:
  		return get_features_generic(req, ctrlr->feat.write_atomicity.raw);
  	case SPDK_NVME_FEAT_ASYNC_EVENT_CONFIGURATION:
  		return get_features_generic(req, ctrlr->feat.async_event_configuration.raw);
  	case SPDK_NVME_FEAT_KEEP_ALIVE_TIMER:
  		return get_features_generic(req, ctrlr->feat.keep_alive_timer.raw);
  	case SPDK_NVME_FEAT_HOST_IDENTIFIER:
  		return spdk_nvmf_ctrlr_get_features_host_identifier(req);
  	case SPDK_NVME_FEAT_HOST_RESERVE_MASK:
  		return spdk_nvmf_ctrlr_get_features_reservation_notification_mask(req);
  	case SPDK_NVME_FEAT_HOST_RESERVE_PERSIST:
  		return spdk_nvmf_ctrlr_get_features_reservation_persistence(req);
  	default:
  		SPDK_ERRLOG("Get Features command with unsupported feature ID 0x%02x\n", feature);
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  }
  
  static int
  spdk_nvmf_ctrlr_set_features(struct spdk_nvmf_request *req)
  {
  	uint8_t feature;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  
  	feature = cmd->cdw10_bits.set_features.fid;
  	switch (feature) {
  	case SPDK_NVME_FEAT_ARBITRATION:
  		return spdk_nvmf_ctrlr_set_features_arbitration(req);
  	case SPDK_NVME_FEAT_POWER_MANAGEMENT:
  		return spdk_nvmf_ctrlr_set_features_power_management(req);
  	case SPDK_NVME_FEAT_TEMPERATURE_THRESHOLD:
  		return spdk_nvmf_ctrlr_set_features_temperature_threshold(req);
  	case SPDK_NVME_FEAT_ERROR_RECOVERY:
  		return spdk_nvmf_ctrlr_set_features_error_recovery(req);
  	case SPDK_NVME_FEAT_VOLATILE_WRITE_CACHE:
  		return spdk_nvmf_ctrlr_set_features_volatile_write_cache(req);
  	case SPDK_NVME_FEAT_NUMBER_OF_QUEUES:
  		return spdk_nvmf_ctrlr_set_features_number_of_queues(req);
  	case SPDK_NVME_FEAT_WRITE_ATOMICITY:
  		return spdk_nvmf_ctrlr_set_features_write_atomicity(req);
  	case SPDK_NVME_FEAT_ASYNC_EVENT_CONFIGURATION:
  		return spdk_nvmf_ctrlr_set_features_async_event_configuration(req);
  	case SPDK_NVME_FEAT_KEEP_ALIVE_TIMER:
  		return spdk_nvmf_ctrlr_set_features_keep_alive_timer(req);
  	case SPDK_NVME_FEAT_HOST_IDENTIFIER:
  		return spdk_nvmf_ctrlr_set_features_host_identifier(req);
  	case SPDK_NVME_FEAT_HOST_RESERVE_MASK:
  		return spdk_nvmf_ctrlr_set_features_reservation_notification_mask(req);
  	case SPDK_NVME_FEAT_HOST_RESERVE_PERSIST:
  		return spdk_nvmf_ctrlr_set_features_reservation_persistence(req);
  	default:
  		SPDK_ERRLOG("Set Features command with unsupported feature ID 0x%02x\n", feature);
  		response->status.sc = SPDK_NVME_SC_INVALID_FIELD;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  }
  
  static int
  spdk_nvmf_ctrlr_keep_alive(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Keep Alive\n");
  	/*
  	 * To handle keep alive just clear or reset the
  	 * ctrlr based keep alive duration counter.
  	 * When added, a separate timer based process
  	 * will monitor if the time since last recorded
  	 * keep alive has exceeded the max duration and
  	 * take appropriate action.
  	 */
  	ctrlr->last_keep_alive_tick = spdk_get_ticks();
  
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  int
  spdk_nvmf_ctrlr_process_admin_cmd(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  
  	if (ctrlr == NULL) {
  		SPDK_ERRLOG("Admin command sent before CONNECT\n");
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (ctrlr->vcprop.cc.bits.en != 1) {
  		SPDK_ERRLOG("Admin command sent to disabled controller\n");
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (req->data && spdk_nvme_opc_get_data_transfer(cmd->opc) == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
  		memset(req->data, 0, req->length);
  	}
  
  	if (ctrlr->subsys->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) {
  		/* Discovery controllers only support Get Log Page and Identify */
  		switch (cmd->opc) {
  		case SPDK_NVME_OPC_IDENTIFY:
  		case SPDK_NVME_OPC_GET_LOG_PAGE:
  			break;
  		default:
  			goto invalid_opcode;
  		}
  	}
  
  	switch (cmd->opc) {
  	case SPDK_NVME_OPC_GET_LOG_PAGE:
  		return spdk_nvmf_ctrlr_get_log_page(req);
  	case SPDK_NVME_OPC_IDENTIFY:
  		return spdk_nvmf_ctrlr_identify(req);
  	case SPDK_NVME_OPC_ABORT:
  		return spdk_nvmf_ctrlr_abort(req);
  	case SPDK_NVME_OPC_GET_FEATURES:
  		return spdk_nvmf_ctrlr_get_features(req);
  	case SPDK_NVME_OPC_SET_FEATURES:
  		return spdk_nvmf_ctrlr_set_features(req);
  	case SPDK_NVME_OPC_ASYNC_EVENT_REQUEST:
  		return spdk_nvmf_ctrlr_async_event_request(req);
  	case SPDK_NVME_OPC_KEEP_ALIVE:
  		return spdk_nvmf_ctrlr_keep_alive(req);
  
  	case SPDK_NVME_OPC_CREATE_IO_SQ:
  	case SPDK_NVME_OPC_CREATE_IO_CQ:
  	case SPDK_NVME_OPC_DELETE_IO_SQ:
  	case SPDK_NVME_OPC_DELETE_IO_CQ:
  		/* Create and Delete I/O CQ/SQ not allowed in NVMe-oF */
  		goto invalid_opcode;
  
  	default:
  		goto invalid_opcode;
  	}
  
  invalid_opcode:
  	SPDK_ERRLOG("Unsupported admin opcode 0x%x\n", cmd->opc);
  	response->status.sct = SPDK_NVME_SCT_GENERIC;
  	response->status.sc = SPDK_NVME_SC_INVALID_OPCODE;
  	return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  }
  
  int
  spdk_nvmf_ctrlr_process_fabrics_cmd(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	struct spdk_nvmf_capsule_cmd *cap_hdr;
  
  	cap_hdr = &req->cmd->nvmf_cmd;
  
  	if (qpair->ctrlr == NULL) {
  		/* No ctrlr established yet; the only valid command is Connect */
  		if (cap_hdr->fctype == SPDK_NVMF_FABRIC_COMMAND_CONNECT) {
  			return spdk_nvmf_ctrlr_connect(req);
  		} else {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Got fctype 0x%x, expected Connect\n",
  				      cap_hdr->fctype);
  			req->rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
  			req->rsp->nvme_cpl.status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		}
  	} else if (spdk_nvmf_qpair_is_admin_queue(qpair)) {
  		/*
  		 * Controller session is established, and this is an admin queue.
  		 * Disallow Connect and allow other fabrics commands.
  		 */
  		switch (cap_hdr->fctype) {
  		case SPDK_NVMF_FABRIC_COMMAND_PROPERTY_SET:
  			return spdk_nvmf_property_set(req);
  		case SPDK_NVMF_FABRIC_COMMAND_PROPERTY_GET:
  			return spdk_nvmf_property_get(req);
  		default:
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "unknown fctype 0x%02x\n",
  				      cap_hdr->fctype);
  			req->rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
  			req->rsp->nvme_cpl.status.sc = SPDK_NVME_SC_INVALID_OPCODE;
  			return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  		}
  	} else {
  		/* Controller session is established, and this is an I/O queue */
  		/* For now, no I/O-specific Fabrics commands are implemented (other than Connect) */
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Unexpected I/O fctype 0x%x\n", cap_hdr->fctype);
  		req->rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
  		req->rsp->nvme_cpl.status.sc = SPDK_NVME_SC_INVALID_OPCODE;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  }
  
  int
  spdk_nvmf_ctrlr_async_event_ns_notice(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	struct spdk_nvmf_request *req;
  	struct spdk_nvme_cpl *rsp;
  	union spdk_nvme_async_event_completion event = {0};
  
  	/* Users may disable the event notification */
  	if (!ctrlr->feat.async_event_configuration.bits.ns_attr_notice) {
  		return 0;
  	}
  
  	event.bits.async_event_type = SPDK_NVME_ASYNC_EVENT_TYPE_NOTICE;
  	event.bits.async_event_info = SPDK_NVME_ASYNC_EVENT_NS_ATTR_CHANGED;
  	event.bits.log_page_identifier = SPDK_NVME_LOG_CHANGED_NS_LIST;
  
  	/* If there is no outstanding AER request, queue the event.  Then
  	 * if an AER is later submitted, this event can be sent as a
  	 * response.
  	 */
  	if (!ctrlr->aer_req) {
  		if (ctrlr->notice_event.bits.async_event_type ==
  		    SPDK_NVME_ASYNC_EVENT_TYPE_NOTICE) {
  			return 0;
  		}
  
  		ctrlr->notice_event.raw = event.raw;
  		return 0;
  	}
  
  	req = ctrlr->aer_req;
  	rsp = &req->rsp->nvme_cpl;
  
  	rsp->cdw0 = event.raw;
  
  	spdk_nvmf_request_complete(req);
  	ctrlr->aer_req = NULL;
  
  	return 0;
  }
  
  void
  spdk_nvmf_ctrlr_async_event_reservation_notification(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	struct spdk_nvmf_request *req;
  	struct spdk_nvme_cpl *rsp;
  	union spdk_nvme_async_event_completion event = {0};
  
  	if (!ctrlr->num_avail_log_pages) {
  		return;
  	}
  	event.bits.async_event_type = SPDK_NVME_ASYNC_EVENT_TYPE_IO;
  	event.bits.async_event_info = SPDK_NVME_ASYNC_EVENT_RESERVATION_LOG_AVAIL;
  	event.bits.log_page_identifier = SPDK_NVME_LOG_RESERVATION_NOTIFICATION;
  
  	/* If there is no outstanding AER request, queue the event.  Then
  	 * if an AER is later submitted, this event can be sent as a
  	 * response.
  	 */
  	if (!ctrlr->aer_req) {
  		if (ctrlr->reservation_event.bits.async_event_type ==
  		    SPDK_NVME_ASYNC_EVENT_TYPE_IO) {
  			return;
  		}
  
  		ctrlr->reservation_event.raw = event.raw;
  		return;
  	}
  
  	req = ctrlr->aer_req;
  	rsp = &req->rsp->nvme_cpl;
  
  	rsp->cdw0 = event.raw;
  
  	spdk_nvmf_request_complete(req);
  	ctrlr->aer_req = NULL;
  }
  
  void
  spdk_nvmf_qpair_free_aer(struct spdk_nvmf_qpair *qpair)
  {
  	struct spdk_nvmf_ctrlr *ctrlr = qpair->ctrlr;
  
  	if (!spdk_nvmf_qpair_is_admin_queue(qpair)) {
  		return;
  	}
  
  	if (ctrlr->aer_req != NULL) {
  		spdk_nvmf_request_free(ctrlr->aer_req);
  		ctrlr->aer_req = NULL;
  	}
  }
  
  void
  spdk_nvmf_ctrlr_abort_aer(struct spdk_nvmf_ctrlr *ctrlr)
  {
  	if (!ctrlr->aer_req) {
  		return;
  	}
  
  	spdk_nvmf_request_complete(ctrlr->aer_req);
  	ctrlr->aer_req = NULL;
  }
  
  static void
  _nvmf_ctrlr_add_reservation_log(void *ctx)
  {
  	struct spdk_nvmf_reservation_log *log = (struct spdk_nvmf_reservation_log *)ctx;
  	struct spdk_nvmf_ctrlr *ctrlr = log->ctrlr;
  
  	ctrlr->log_page_count++;
  
  	/* Maximum number of queued log pages is 255 */
  	if (ctrlr->num_avail_log_pages == 0xff) {
  		struct spdk_nvmf_reservation_log *entry;
  		entry = TAILQ_LAST(&ctrlr->log_head, log_page_head);
  		entry->log.log_page_count = ctrlr->log_page_count;
  		free(log);
  		return;
  	}
  
  	log->log.log_page_count = ctrlr->log_page_count;
  	log->log.num_avail_log_pages = ctrlr->num_avail_log_pages++;
  	TAILQ_INSERT_TAIL(&ctrlr->log_head, log, link);
  
  	spdk_nvmf_ctrlr_async_event_reservation_notification(ctrlr);
  }
  
  void
  spdk_nvmf_ctrlr_reservation_notice_log(struct spdk_nvmf_ctrlr *ctrlr,
  				       struct spdk_nvmf_ns *ns,
  				       enum spdk_nvme_reservation_notification_log_page_type type)
  {
  	struct spdk_nvmf_reservation_log *log;
  
  	switch (type) {
  	case SPDK_NVME_RESERVATION_LOG_PAGE_EMPTY:
  		return;
  	case SPDK_NVME_REGISTRATION_PREEMPTED:
  		if (ns->mask & SPDK_NVME_REGISTRATION_PREEMPTED_MASK) {
  			return;
  		}
  		break;
  	case SPDK_NVME_RESERVATION_RELEASED:
  		if (ns->mask & SPDK_NVME_RESERVATION_RELEASED_MASK) {
  			return;
  		}
  		break;
  	case SPDK_NVME_RESERVATION_PREEMPTED:
  		if (ns->mask & SPDK_NVME_RESERVATION_PREEMPTED_MASK) {
  			return;
  		}
  		break;
  	default:
  		return;
  	}
  
  	log = calloc(1, sizeof(*log));
  	if (!log) {
  		SPDK_ERRLOG("Alloc log page failed, ignore the log\n");
  		return;
  	}
  	log->ctrlr = ctrlr;
  	log->log.type = type;
  	log->log.nsid = ns->nsid;
  
  	spdk_thread_send_msg(ctrlr->thread, _nvmf_ctrlr_add_reservation_log, log);
  }
  
  /* Check from subsystem poll group's namespace information data structure */
  static bool
  nvmf_ns_info_ctrlr_is_registrant(struct spdk_nvmf_subsystem_pg_ns_info *ns_info,
  				 struct spdk_nvmf_ctrlr *ctrlr)
  {
  	uint32_t i;
  
  	for (i = 0; i < SPDK_NVMF_MAX_NUM_REGISTRANTS; i++) {
  		if (!spdk_uuid_compare(&ns_info->reg_hostid[i], &ctrlr->hostid)) {
  			return true;
  		}
  	}
  
  	return false;
  }
  
  /*
   * Check the NVMe command is permitted or not for current controller(Host).
   */
  static int
  nvmf_ns_reservation_request_check(struct spdk_nvmf_subsystem_pg_ns_info *ns_info,
  				  struct spdk_nvmf_ctrlr *ctrlr,
  				  struct spdk_nvmf_request *req)
  {
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	enum spdk_nvme_reservation_type rtype = ns_info->rtype;
  	uint8_t status = SPDK_NVME_SC_SUCCESS;
  	uint8_t racqa;
  	bool is_registrant;
  
  	/* No valid reservation */
  	if (!rtype) {
  		return 0;
  	}
  
  	is_registrant = nvmf_ns_info_ctrlr_is_registrant(ns_info, ctrlr);
  	/* All registrants type and current ctrlr is a valid registrant */
  	if ((rtype == SPDK_NVME_RESERVE_WRITE_EXCLUSIVE_ALL_REGS ||
  	     rtype == SPDK_NVME_RESERVE_EXCLUSIVE_ACCESS_ALL_REGS) && is_registrant) {
  		return 0;
  	} else if (!spdk_uuid_compare(&ns_info->holder_id, &ctrlr->hostid)) {
  		return 0;
  	}
  
  	/* Non-holder for current controller */
  	switch (cmd->opc) {
  	case SPDK_NVME_OPC_READ:
  	case SPDK_NVME_OPC_COMPARE:
  		if (rtype == SPDK_NVME_RESERVE_EXCLUSIVE_ACCESS) {
  			status = SPDK_NVME_SC_RESERVATION_CONFLICT;
  			goto exit;
  		}
  		if ((rtype == SPDK_NVME_RESERVE_EXCLUSIVE_ACCESS_REG_ONLY ||
  		     rtype == SPDK_NVME_RESERVE_EXCLUSIVE_ACCESS_ALL_REGS) && !is_registrant) {
  			status = SPDK_NVME_SC_RESERVATION_CONFLICT;
  		}
  		break;
  	case SPDK_NVME_OPC_FLUSH:
  	case SPDK_NVME_OPC_WRITE:
  	case SPDK_NVME_OPC_WRITE_UNCORRECTABLE:
  	case SPDK_NVME_OPC_WRITE_ZEROES:
  	case SPDK_NVME_OPC_DATASET_MANAGEMENT:
  		if (rtype == SPDK_NVME_RESERVE_WRITE_EXCLUSIVE ||
  		    rtype == SPDK_NVME_RESERVE_EXCLUSIVE_ACCESS) {
  			status = SPDK_NVME_SC_RESERVATION_CONFLICT;
  			goto exit;
  		}
  		if (!is_registrant) {
  			status = SPDK_NVME_SC_RESERVATION_CONFLICT;
  		}
  		break;
  	case SPDK_NVME_OPC_RESERVATION_ACQUIRE:
  		racqa = cmd->cdw10_bits.resv_acquire.racqa;
  		if (racqa == SPDK_NVME_RESERVE_ACQUIRE) {
  			status = SPDK_NVME_SC_RESERVATION_CONFLICT;
  			goto exit;
  		}
  		if (!is_registrant) {
  			status = SPDK_NVME_SC_RESERVATION_CONFLICT;
  		}
  		break;
  	case SPDK_NVME_OPC_RESERVATION_RELEASE:
  		if (!is_registrant) {
  			status = SPDK_NVME_SC_RESERVATION_CONFLICT;
  		}
  		break;
  	default:
  		break;
  	}
  
  exit:
  	req->rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
  	req->rsp->nvme_cpl.status.sc = status;
  	if (status == SPDK_NVME_SC_RESERVATION_CONFLICT) {
  		return -EPERM;
  	}
  
  	return 0;
  }
  
  int
  spdk_nvmf_ctrlr_process_io_cmd(struct spdk_nvmf_request *req)
  {
  	uint32_t nsid;
  	struct spdk_nvmf_ns *ns;
  	struct spdk_bdev *bdev;
  	struct spdk_bdev_desc *desc;
  	struct spdk_io_channel *ch;
  	struct spdk_nvmf_poll_group *group = req->qpair->group;
  	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
  	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
  	struct spdk_nvme_cpl *response = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_subsystem_pg_ns_info *ns_info;
  
  	/* pre-set response details for this command */
  	response->status.sc = SPDK_NVME_SC_SUCCESS;
  	nsid = cmd->nsid;
  
  	if (spdk_unlikely(ctrlr == NULL)) {
  		SPDK_ERRLOG("I/O command sent before CONNECT\n");
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	if (spdk_unlikely(ctrlr->vcprop.cc.bits.en != 1)) {
  		SPDK_ERRLOG("I/O command sent to disabled controller\n");
  		response->status.sct = SPDK_NVME_SCT_GENERIC;
  		response->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	ns = _spdk_nvmf_subsystem_get_ns(ctrlr->subsys, nsid);
  	if (ns == NULL || ns->bdev == NULL) {
  		SPDK_ERRLOG("Unsuccessful query for nsid %u\n", cmd->nsid);
  		response->status.sc = SPDK_NVME_SC_INVALID_NAMESPACE_OR_FORMAT;
  		response->status.dnr = 1;
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	/* scan-build falsely reporting dereference of null pointer */
  	assert(group != NULL && group->sgroups != NULL);
  	ns_info = &group->sgroups[ctrlr->subsys->id].ns_info[nsid - 1];
  	if (nvmf_ns_reservation_request_check(ns_info, ctrlr, req)) {
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Reservation Conflict for nsid %u, opcode %u\n",
  			      cmd->nsid, cmd->opc);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
  	}
  
  	bdev = ns->bdev;
  	desc = ns->desc;
  	ch = ns_info->channel;
  	switch (cmd->opc) {
  	case SPDK_NVME_OPC_READ:
  		return spdk_nvmf_bdev_ctrlr_read_cmd(bdev, desc, ch, req);
  	case SPDK_NVME_OPC_WRITE:
  		return spdk_nvmf_bdev_ctrlr_write_cmd(bdev, desc, ch, req);
  	case SPDK_NVME_OPC_WRITE_ZEROES:
  		return spdk_nvmf_bdev_ctrlr_write_zeroes_cmd(bdev, desc, ch, req);
  	case SPDK_NVME_OPC_FLUSH:
  		return spdk_nvmf_bdev_ctrlr_flush_cmd(bdev, desc, ch, req);
  	case SPDK_NVME_OPC_DATASET_MANAGEMENT:
  		return spdk_nvmf_bdev_ctrlr_dsm_cmd(bdev, desc, ch, req);
  	case SPDK_NVME_OPC_RESERVATION_REGISTER:
  	case SPDK_NVME_OPC_RESERVATION_ACQUIRE:
  	case SPDK_NVME_OPC_RESERVATION_RELEASE:
  	case SPDK_NVME_OPC_RESERVATION_REPORT:
  		spdk_thread_send_msg(ctrlr->subsys->thread, spdk_nvmf_ns_reservation_request, req);
  		return SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS;
  	default:
  		return spdk_nvmf_bdev_ctrlr_nvme_passthru_io(bdev, desc, ch, req);
  	}
  }
  
  static void
  spdk_nvmf_qpair_request_cleanup(struct spdk_nvmf_qpair *qpair)
  {
  	if (qpair->state == SPDK_NVMF_QPAIR_DEACTIVATING) {
  		assert(qpair->state_cb != NULL);
  
  		if (TAILQ_EMPTY(&qpair->outstanding)) {
  			qpair->state_cb(qpair->state_cb_arg, 0);
  		}
  	} else {
  		assert(qpair->state == SPDK_NVMF_QPAIR_ACTIVE);
  	}
  }
  
  int
  spdk_nvmf_request_free(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  
  	TAILQ_REMOVE(&qpair->outstanding, req, link);
  	if (spdk_nvmf_transport_req_free(req)) {
  		SPDK_ERRLOG("Unable to free transport level request resources.\n");
  	}
  
  	spdk_nvmf_qpair_request_cleanup(qpair);
  
  	return 0;
  }
  
  int
  spdk_nvmf_request_complete(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
  	struct spdk_nvmf_qpair *qpair;
  	struct spdk_nvmf_subsystem_poll_group *sgroup = NULL;
  	bool is_connect = req->cmd->nvmf_cmd.opcode == SPDK_NVME_OPC_FABRIC &&
  			  req->cmd->nvmf_cmd.fctype == SPDK_NVMF_FABRIC_COMMAND_CONNECT;
  
  	rsp->sqid = 0;
  	rsp->status.p = 0;
  	rsp->cid = req->cmd->nvme_cmd.cid;
  
  	qpair = req->qpair;
  	if (qpair->ctrlr) {
  		sgroup = &qpair->group->sgroups[qpair->ctrlr->subsys->id];
  	}
  
  	SPDK_DEBUGLOG(SPDK_LOG_NVMF,
  		      "cpl: cid=%u cdw0=0x%08x rsvd1=%u status=0x%04x\n",
  		      rsp->cid, rsp->cdw0, rsp->rsvd1,
  		      *(uint16_t *)&rsp->status);
  
  	TAILQ_REMOVE(&qpair->outstanding, req, link);
  	if (spdk_nvmf_transport_req_complete(req)) {
  		SPDK_ERRLOG("Transport request completion error!\n");
  	}
  
  	/* AER cmd and fabric connect are exceptions */
  	if (sgroup != NULL && qpair->ctrlr->aer_req != req && !is_connect) {
  		assert(sgroup->io_outstanding > 0);
  		sgroup->io_outstanding--;
  		if (sgroup->state == SPDK_NVMF_SUBSYSTEM_PAUSING &&
  		    sgroup->io_outstanding == 0) {
  			sgroup->state = SPDK_NVMF_SUBSYSTEM_PAUSED;
  			sgroup->cb_fn(sgroup->cb_arg, 0);
  		}
  	}
  
  	spdk_nvmf_qpair_request_cleanup(qpair);
  
  	return 0;
  }
  
  static void
  nvmf_trace_command(union nvmf_h2c_msg *h2c_msg, bool is_admin_queue)
  {
  	struct spdk_nvmf_capsule_cmd *cap_hdr = &h2c_msg->nvmf_cmd;
  	struct spdk_nvme_cmd *cmd = &h2c_msg->nvme_cmd;
  	struct spdk_nvme_sgl_descriptor *sgl = &cmd->dptr.sgl1;
  	uint8_t opc;
  
  	if (cmd->opc == SPDK_NVME_OPC_FABRIC) {
  		opc = cap_hdr->fctype;
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "%s Fabrics cmd: fctype 0x%02x cid %u\n",
  			      is_admin_queue ? "Admin" : "I/O",
  			      cap_hdr->fctype, cap_hdr->cid);
  	} else {
  		opc = cmd->opc;
  		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "%s cmd: opc 0x%02x fuse %u cid %u nsid %u cdw10 0x%08x\n",
  			      is_admin_queue ? "Admin" : "I/O",
  			      cmd->opc, cmd->fuse, cmd->cid, cmd->nsid, cmd->cdw10);
  		if (cmd->mptr) {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "mptr 0x%" PRIx64 "\n", cmd->mptr);
  		}
  		if (cmd->psdt != SPDK_NVME_PSDT_SGL_MPTR_CONTIG &&
  		    cmd->psdt != SPDK_NVME_PSDT_SGL_MPTR_SGL) {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "psdt %u\n", cmd->psdt);
  		}
  	}
  
  	if (spdk_nvme_opc_get_data_transfer(opc) != SPDK_NVME_DATA_NONE) {
  		if (sgl->generic.type == SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK) {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF,
  				      "SGL: Keyed%s: addr 0x%" PRIx64 " key 0x%x len 0x%x\n",
  				      sgl->generic.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY ? " (Inv)" : "",
  				      sgl->address, sgl->keyed.key, sgl->keyed.length);
  		} else if (sgl->generic.type == SPDK_NVME_SGL_TYPE_DATA_BLOCK) {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "SGL: Data block: %s 0x%" PRIx64 " len 0x%x\n",
  				      sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET ? "offs" : "addr",
  				      sgl->address, sgl->unkeyed.length);
  		} else {
  			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "SGL type 0x%x subtype 0x%x\n",
  				      sgl->generic.type, sgl->generic.subtype);
  		}
  	}
  }
  
  void
  spdk_nvmf_request_exec(struct spdk_nvmf_request *req)
  {
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	spdk_nvmf_request_exec_status status;
  	struct spdk_nvmf_subsystem_poll_group *sgroup = NULL;
  
  	nvmf_trace_command(req->cmd, spdk_nvmf_qpair_is_admin_queue(qpair));
  
  	if (qpair->ctrlr) {
  		sgroup = &qpair->group->sgroups[qpair->ctrlr->subsys->id];
  	}
  
  	if (qpair->state != SPDK_NVMF_QPAIR_ACTIVE) {
  		req->rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
  		req->rsp->nvme_cpl.status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
  		/* Place the request on the outstanding list so we can keep track of it */
  		TAILQ_INSERT_TAIL(&qpair->outstanding, req, link);
  		/* Still increment io_outstanding because request_complete decrements it */
  		if (sgroup != NULL) {
  			sgroup->io_outstanding++;
  		}
  		spdk_nvmf_request_complete(req);
  		return;
  	}
  
  	/* Check if the subsystem is paused (if there is a subsystem) */
  	if (sgroup != NULL) {
  		if (sgroup->state != SPDK_NVMF_SUBSYSTEM_ACTIVE) {
  			/* The subsystem is not currently active. Queue this request. */
  			TAILQ_INSERT_TAIL(&sgroup->queued, req, link);
  			return;
  		}
  
  		sgroup->io_outstanding++;
  	}
  
  	/* Place the request on the outstanding list so we can keep track of it */
  	TAILQ_INSERT_TAIL(&qpair->outstanding, req, link);
  
  	if (spdk_unlikely(req->cmd->nvmf_cmd.opcode == SPDK_NVME_OPC_FABRIC)) {
  		status = spdk_nvmf_ctrlr_process_fabrics_cmd(req);
  	} else if (spdk_unlikely(spdk_nvmf_qpair_is_admin_queue(qpair))) {
  		status = spdk_nvmf_ctrlr_process_admin_cmd(req);
  	} else {
  		status = spdk_nvmf_ctrlr_process_io_cmd(req);
  	}
  
  	if (status == SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE) {
  		spdk_nvmf_request_complete(req);
  	}
  }
  
  static bool
  spdk_nvmf_ctrlr_get_dif_ctx(struct spdk_nvmf_ctrlr *ctrlr, struct spdk_nvme_cmd *cmd,
  			    struct spdk_dif_ctx *dif_ctx)
  {
  	struct spdk_nvmf_ns *ns;
  	struct spdk_bdev *bdev;
  
  	if (ctrlr == NULL || cmd == NULL) {
  		return false;
  	}
  
  	ns = _spdk_nvmf_subsystem_get_ns(ctrlr->subsys, cmd->nsid);
  	if (ns == NULL || ns->bdev == NULL) {
  		return false;
  	}
  
  	bdev = ns->bdev;
  
  	switch (cmd->opc) {
  	case SPDK_NVME_OPC_READ:
  	case SPDK_NVME_OPC_WRITE:
  	case SPDK_NVME_OPC_COMPARE:
  		return spdk_nvmf_bdev_ctrlr_get_dif_ctx(bdev, cmd, dif_ctx);
  	default:
  		break;
  	}
  
  	return false;
  }
  
  bool
  spdk_nvmf_request_get_dif_ctx(struct spdk_nvmf_request *req, struct spdk_dif_ctx *dif_ctx)
  {
  	struct spdk_nvmf_qpair *qpair = req->qpair;
  	struct spdk_nvmf_ctrlr *ctrlr = qpair->ctrlr;
  
  	if (spdk_likely(ctrlr == NULL || !ctrlr->dif_insert_or_strip)) {
  		return false;
  	}
  
  	if (spdk_unlikely(qpair->state != SPDK_NVMF_QPAIR_ACTIVE)) {
  		return false;
  	}
  
  	if (spdk_unlikely(req->cmd->nvmf_cmd.opcode == SPDK_NVME_OPC_FABRIC)) {
  		return false;
  	}
  
  	if (spdk_unlikely(spdk_nvmf_qpair_is_admin_queue(qpair))) {
  		return false;
  	}
  
  	return spdk_nvmf_ctrlr_get_dif_ctx(ctrlr, &req->cmd->nvme_cmd, dif_ctx);
  }
  