/*-
 *   BSD LICENSE
 *
 *   Copyright (c) Intel Corporation.
 *   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/env.h"
#include "spdk/fd.h"
#include "spdk/nvme.h"
#include "spdk/env.h"
#include "spdk/queue.h"
#include "spdk/string.h"
#include "spdk/nvme_intel.h"
#include "spdk/histogram_data.h"
#include "spdk/endian.h"
#include "spdk/crc16.h"

#if HAVE_LIBAIO
#include <libaio.h>
#endif

struct ctrlr_entry {
	struct spdk_nvme_ctrlr			*ctrlr;
	struct spdk_nvme_intel_rw_latency_page	*latency_page;
	struct ctrlr_entry			*next;
	char					name[1024];
};

enum entry_type {
	ENTRY_TYPE_NVME_NS,
	ENTRY_TYPE_AIO_FILE,
};

struct ns_entry {
	enum entry_type		type;

	union {
		struct {
			struct spdk_nvme_ctrlr	*ctrlr;
			struct spdk_nvme_ns	*ns;
		} nvme;
#if HAVE_LIBAIO
		struct {
			int			fd;
		} aio;
#endif
	} u;

	struct ns_entry		*next;
	uint32_t		io_size_blocks;
	uint32_t		num_io_requests;
	uint64_t		size_in_ios;
	uint32_t		io_flags;
	uint16_t		apptag_mask;
	uint16_t		apptag;
	char			name[1024];
	const struct spdk_nvme_ns_data	*nsdata;
};

static const double g_latency_cutoffs[] = {
	0.01,
	0.10,
	0.25,
	0.50,
	0.75,
	0.90,
	0.95,
	0.98,
	0.99,
	0.995,
	0.999,
	0.9999,
	0.99999,
	0.999999,
	0.9999999,
	-1,
};

struct ns_worker_ctx {
	struct ns_entry		*entry;
	uint64_t		io_completed;
	uint64_t		total_tsc;
	uint64_t		min_tsc;
	uint64_t		max_tsc;
	uint64_t		current_queue_depth;
	uint64_t		offset_in_ios;
	bool			is_draining;

	union {
		struct {
			struct spdk_nvme_qpair	*qpair;
		} nvme;

#if HAVE_LIBAIO
		struct {
			struct io_event		*events;
			io_context_t		ctx;
		} aio;
#endif
	} u;

	struct ns_worker_ctx	*next;

	struct spdk_histogram_data	*histogram;
};

struct perf_task {
	struct ns_worker_ctx	*ns_ctx;
	void			*buf;
	uint64_t		submit_tsc;
	uint16_t		appmask;
	uint16_t		apptag;
	uint64_t		lba;
	bool			is_read;
#if HAVE_LIBAIO
	struct iocb		iocb;
#endif
};

struct worker_thread {
	struct ns_worker_ctx	*ns_ctx;
	struct worker_thread	*next;
	unsigned		lcore;
};

static int g_outstanding_commands;

static bool g_latency_ssd_tracking_enable = false;
static int g_latency_sw_tracking_level = 0;

static struct ctrlr_entry *g_controllers = NULL;
static int g_controllers_found = 0;
static struct ns_entry *g_namespaces = NULL;
static int g_num_namespaces = 0;
static struct worker_thread *g_workers = NULL;
static int g_num_workers = 0;

static uint64_t g_tsc_rate;

static uint32_t g_io_align = 0x200;
static uint32_t g_io_size_bytes;
static uint32_t g_max_io_md_size;
static uint32_t g_max_io_size_blocks;
static uint32_t g_metacfg_pract_flag;
static uint32_t g_metacfg_prchk_flags;
static int g_rw_percentage;
static int g_is_random;
static int g_queue_depth;
static int g_time_in_sec;
static uint32_t g_max_completions;
static int g_dpdk_mem;
static int g_shm_id = -1;
static uint32_t g_disable_sq_cmb;
static bool g_no_pci;
static bool g_warn;

static const char *g_core_mask;

struct trid_entry {
	struct spdk_nvme_transport_id	trid;
	uint16_t			nsid;
	TAILQ_ENTRY(trid_entry)		tailq;
};

static TAILQ_HEAD(, trid_entry) g_trid_list = TAILQ_HEAD_INITIALIZER(g_trid_list);

static int g_aio_optind; /* Index of first AIO filename in argv */

static void
task_complete(struct perf_task *task);

static void
register_ns(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_ns *ns)
{
	struct ns_entry *entry;
	const struct spdk_nvme_ctrlr_data *cdata;
	uint32_t max_xfer_size, entries;
	struct spdk_nvme_io_qpair_opts opts;

	cdata = spdk_nvme_ctrlr_get_data(ctrlr);

	if (!spdk_nvme_ns_is_active(ns)) {
		printf("Controller %-20.20s (%-20.20s): Skipping inactive NS %u\n",
		       cdata->mn, cdata->sn,
		       spdk_nvme_ns_get_id(ns));
		g_warn = true;
		return;
	}

	if (spdk_nvme_ns_get_size(ns) < g_io_size_bytes ||
	    spdk_nvme_ns_get_sector_size(ns) > g_io_size_bytes) {
		printf("WARNING: controller %-20.20s (%-20.20s) ns %u has invalid "
		       "ns size %" PRIu64 " / block size %u for I/O size %u\n",
		       cdata->mn, cdata->sn, spdk_nvme_ns_get_id(ns),
		       spdk_nvme_ns_get_size(ns), spdk_nvme_ns_get_sector_size(ns), g_io_size_bytes);
		g_warn = true;
		return;
	}

	max_xfer_size = spdk_nvme_ns_get_max_io_xfer_size(ns);
	spdk_nvme_ctrlr_get_default_io_qpair_opts(ctrlr, &opts, sizeof(opts));
	/* NVMe driver may add additional entries based on
	 * stripe size and maximum transfer size, we assume
	 * 1 more entry be used for stripe.
	 */
	entries = (g_io_size_bytes - 1) / max_xfer_size + 2;
	if ((g_queue_depth * entries) > opts.io_queue_size) {
		printf("controller IO queue size %u less than required\n",
		       opts.io_queue_size);
		printf("Consider using lower queue depth or small IO size because "
		       "IO requests may be queued at the NVMe driver.\n");
		g_warn = true;
	}

	entry = calloc(1, sizeof(struct ns_entry));
	if (entry == NULL) {
		perror("ns_entry malloc");
		exit(1);
	}

	entry->type = ENTRY_TYPE_NVME_NS;
	entry->u.nvme.ctrlr = ctrlr;
	entry->u.nvme.ns = ns;
	entry->num_io_requests = entries;

	entry->size_in_ios = spdk_nvme_ns_get_size(ns) /
			     g_io_size_bytes;
	entry->io_size_blocks = g_io_size_bytes / spdk_nvme_ns_get_sector_size(ns);

	if (spdk_nvme_ns_get_flags(ns) & SPDK_NVME_NS_DPS_PI_SUPPORTED) {
		entry->io_flags = g_metacfg_pract_flag | g_metacfg_prchk_flags;
	}

	if (g_max_io_md_size < spdk_nvme_ns_get_md_size(ns)) {
		g_max_io_md_size = spdk_nvme_ns_get_md_size(ns);
	}

	if (g_max_io_size_blocks < entry->io_size_blocks) {
		g_max_io_size_blocks = entry->io_size_blocks;
	}

	entry->nsdata = spdk_nvme_ns_get_data(ns);

	snprintf(entry->name, 44, "%-20.20s (%-20.20s)", cdata->mn, cdata->sn);

	g_num_namespaces++;
	entry->next = g_namespaces;
	g_namespaces = entry;
}

static void
unregister_namespaces(void)
{
	struct ns_entry *entry = g_namespaces;

	while (entry) {
		struct ns_entry *next = entry->next;
		free(entry);
		entry = next;
	}
}

static void
enable_latency_tracking_complete(void *cb_arg, const struct spdk_nvme_cpl *cpl)
{
	if (spdk_nvme_cpl_is_error(cpl)) {
		printf("enable_latency_tracking_complete failed\n");
	}
	g_outstanding_commands--;
}

static void
set_latency_tracking_feature(struct spdk_nvme_ctrlr *ctrlr, bool enable)
{
	int res;
	union spdk_nvme_intel_feat_latency_tracking latency_tracking;

	if (enable) {
		latency_tracking.bits.enable = 0x01;
	} else {
		latency_tracking.bits.enable = 0x00;
	}

	res = spdk_nvme_ctrlr_cmd_set_feature(ctrlr, SPDK_NVME_INTEL_FEAT_LATENCY_TRACKING,
					      latency_tracking.raw, 0, NULL, 0, enable_latency_tracking_complete, NULL);
	if (res) {
		printf("fail to allocate nvme request.\n");
		return;
	}
	g_outstanding_commands++;

	while (g_outstanding_commands) {
		spdk_nvme_ctrlr_process_admin_completions(ctrlr);
	}
}

static void
register_ctrlr(struct spdk_nvme_ctrlr *ctrlr, struct trid_entry *trid_entry)
{
	struct spdk_nvme_ns *ns;
	struct ctrlr_entry *entry = malloc(sizeof(struct ctrlr_entry));
	const struct spdk_nvme_ctrlr_data *cdata = spdk_nvme_ctrlr_get_data(ctrlr);
	uint32_t nsid;

	if (entry == NULL) {
		perror("ctrlr_entry malloc");
		exit(1);
	}

	entry->latency_page = spdk_dma_zmalloc(sizeof(struct spdk_nvme_intel_rw_latency_page),
					       4096, NULL);
	if (entry->latency_page == NULL) {
		printf("Allocation error (latency page)\n");
		exit(1);
	}

	snprintf(entry->name, sizeof(entry->name), "%-20.20s (%-20.20s)", cdata->mn, cdata->sn);

	entry->ctrlr = ctrlr;
	entry->next = g_controllers;
	g_controllers = entry;

	if (g_latency_ssd_tracking_enable &&
	    spdk_nvme_ctrlr_is_feature_supported(ctrlr, SPDK_NVME_INTEL_FEAT_LATENCY_TRACKING)) {
		set_latency_tracking_feature(ctrlr, true);
	}

	if (trid_entry->nsid == 0) {
		for (nsid = spdk_nvme_ctrlr_get_first_active_ns(ctrlr);
		     nsid != 0; nsid = spdk_nvme_ctrlr_get_next_active_ns(ctrlr, nsid)) {
			ns = spdk_nvme_ctrlr_get_ns(ctrlr, nsid);
			if (ns == NULL) {
				continue;
			}
			register_ns(ctrlr, ns);
		}
	} else {
		ns = spdk_nvme_ctrlr_get_ns(ctrlr, trid_entry->nsid);
		if (!ns) {
			perror("Namespace does not exist.");
			exit(1);
		}

		register_ns(ctrlr, ns);
	}

}

#if HAVE_LIBAIO
static int
register_aio_file(const char *path)
{
	struct ns_entry *entry;

	int flags, fd;
	uint64_t size;
	uint32_t blklen;

	if (g_rw_percentage == 100) {
		flags = O_RDONLY;
	} else if (g_rw_percentage == 0) {
		flags = O_WRONLY;
	} else {
		flags = O_RDWR;
	}

	flags |= O_DIRECT;

	fd = open(path, flags);
	if (fd < 0) {
		fprintf(stderr, "Could not open AIO device %s: %s\n", path, strerror(errno));
		return -1;
	}

	size = spdk_fd_get_size(fd);
	if (size == 0) {
		fprintf(stderr, "Could not determine size of AIO device %s\n", path);
		close(fd);
		return -1;
	}

	blklen = spdk_fd_get_blocklen(fd);
	if (blklen == 0) {
		fprintf(stderr, "Could not determine block size of AIO device %s\n", path);
		close(fd);
		return -1;
	}

	/*
	 * TODO: This should really calculate the LCM of the current g_io_align and blklen.
	 * For now, it's fairly safe to just assume all block sizes are powers of 2.
	 */
	if (g_io_align < blklen) {
		g_io_align = blklen;
	}

	entry = malloc(sizeof(struct ns_entry));
	if (entry == NULL) {
		close(fd);
		perror("aio ns_entry malloc");
		return -1;
	}

	entry->type = ENTRY_TYPE_AIO_FILE;
	entry->u.aio.fd = fd;
	entry->size_in_ios = size / g_io_size_bytes;
	entry->io_size_blocks = g_io_size_bytes / blklen;

	snprintf(entry->name, sizeof(entry->name), "%s", path);

	g_num_namespaces++;
	entry->next = g_namespaces;
	g_namespaces = entry;

	return 0;
}

static int
aio_submit(io_context_t aio_ctx, struct iocb *iocb, int fd, enum io_iocb_cmd cmd, void *buf,
	   unsigned long nbytes, uint64_t offset, void *cb_ctx)
{
	iocb->aio_fildes = fd;
	iocb->aio_reqprio = 0;
	iocb->aio_lio_opcode = cmd;
	iocb->u.c.buf = buf;
	iocb->u.c.nbytes = nbytes;
	iocb->u.c.offset = offset;
	iocb->data = cb_ctx;

	if (io_submit(aio_ctx, 1, &iocb) < 0) {
		printf("io_submit");
		return -1;
	}

	return 0;
}

static void
aio_check_io(struct ns_worker_ctx *ns_ctx)
{
	int count, i;
	struct timespec timeout;

	timeout.tv_sec = 0;
	timeout.tv_nsec = 0;

	count = io_getevents(ns_ctx->u.aio.ctx, 1, g_queue_depth, ns_ctx->u.aio.events, &timeout);
	if (count < 0) {
		fprintf(stderr, "io_getevents error\n");
		exit(1);
	}

	for (i = 0; i < count; i++) {
		task_complete(ns_ctx->u.aio.events[i].data);
	}
}
#endif /* HAVE_LIBAIO */

static void
task_extended_lba_setup_pi(struct ns_entry *entry, struct perf_task *task, uint64_t lba,
			   uint32_t lba_count, bool is_write)
{
	struct spdk_nvme_protection_info *pi;
	uint32_t i, md_size, sector_size, pi_offset;
	uint16_t crc16;

	task->appmask = 0;
	task->apptag = 0;

	if (!spdk_nvme_ns_supports_extended_lba(entry->u.nvme.ns)) {
		return;
	}

	if (spdk_nvme_ns_get_pi_type(entry->u.nvme.ns) ==
	    SPDK_NVME_FMT_NVM_PROTECTION_DISABLE) {
		return;
	}

	if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRACT) {
		return;
	}

	/* Type3 don't support REFTAG */
	if (spdk_nvme_ns_get_pi_type(entry->u.nvme.ns) ==
	    SPDK_NVME_FMT_NVM_PROTECTION_TYPE3) {
		return;
	}

	sector_size = spdk_nvme_ns_get_sector_size(entry->u.nvme.ns);
	md_size = spdk_nvme_ns_get_md_size(entry->u.nvme.ns);

	/* PI locates at the first 8 bytes of metadata,
	 * doesn't support now
	 */
	if (entry->nsdata->dps.md_start) {
		return;
	}

	if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRCHK_APPTAG) {
		/* Let's use number of lbas for application tag */
		task->appmask = 0xffff;
		task->apptag = lba_count;
	}

	for (i = 0; i < lba_count; i++) {
		pi_offset = ((sector_size + md_size) * (i + 1)) - 8;
		pi = (struct spdk_nvme_protection_info *)(task->buf + pi_offset);
		memset(pi, 0, sizeof(*pi));

		if (is_write) {
			if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRCHK_GUARD) {
				/* CRC buffer should not include PI */
				crc16 = spdk_crc16_t10dif(task->buf + (sector_size + md_size) * i,
							  sector_size + md_size - 8);
				to_be16(&pi->guard, crc16);
			}
			if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRCHK_APPTAG) {
				/* Let's use number of lbas for application tag */
				to_be16(&pi->app_tag, lba_count);
			}
			if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRCHK_REFTAG) {
				to_be32(&pi->ref_tag, (uint32_t)lba + i);
			}
		}
	}
}

static void
task_extended_lba_pi_verify(struct ns_entry *entry, struct perf_task *task,
			    uint64_t lba, uint32_t lba_count)
{
	struct spdk_nvme_protection_info *pi;
	uint32_t i, md_size, sector_size, pi_offset, ref_tag;
	uint16_t crc16, guard, app_tag;

	if (spdk_nvme_ns_get_pi_type(entry->u.nvme.ns) ==
	    SPDK_NVME_FMT_NVM_PROTECTION_DISABLE) {
		return;
	}

	sector_size = spdk_nvme_ns_get_sector_size(entry->u.nvme.ns);
	md_size = spdk_nvme_ns_get_md_size(entry->u.nvme.ns);

	/* PI locates at the first 8 bytes of metadata,
	 * doesn't support now
	 */
	if (entry->nsdata->dps.md_start) {
		return;
	}

	for (i = 0; i < lba_count; i++) {
		pi_offset = ((sector_size + md_size) * (i + 1)) - 8;
		pi = (struct spdk_nvme_protection_info *)(task->buf + pi_offset);

		if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRCHK_GUARD) {
			/* CRC buffer should not include last 8 bytes of PI */
			crc16 = spdk_crc16_t10dif(task->buf + (sector_size + md_size) * i,
						  sector_size + md_size - 8);
			to_be16(&guard, crc16);
			if (pi->guard != guard) {
				fprintf(stdout, "Get Guard Error LBA 0x%16.16"PRIx64","
					" Preferred 0x%04x but returned with 0x%04x,"
					" may read the LBA without write it first\n",
					lba + i, guard, pi->guard);
			}

		}
		if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRCHK_APPTAG) {
			/* Previously we used the number of lbas as
			 * application tag for writes
			 */
			to_be16(&app_tag, lba_count);
			if (pi->app_tag != app_tag) {
				fprintf(stdout, "Get Application Tag Error LBA 0x%16.16"PRIx64","
					" Preferred 0x%04x but returned with 0x%04x,"
					" may read the LBA without write it first\n",
					lba + i, app_tag, pi->app_tag);
			}
		}
		if (entry->io_flags & SPDK_NVME_IO_FLAGS_PRCHK_REFTAG) {
			to_be32(&ref_tag, (uint32_t)lba + i);
			if (pi->ref_tag != ref_tag) {
				fprintf(stdout, "Get Reference Tag Error LBA 0x%16.16"PRIx64","
					" Preferred 0x%08x but returned with 0x%08x,"
					" may read the LBA without write it first\n",
					lba + i, ref_tag, pi->ref_tag);
			}
		}
	}
}

static void io_complete(void *ctx, const struct spdk_nvme_cpl *completion);

static __thread unsigned int seed = 0;

static void
submit_single_io(struct perf_task *task)
{
	uint64_t		offset_in_ios;
	int			rc;
	struct ns_worker_ctx	*ns_ctx = task->ns_ctx;
	struct ns_entry		*entry = ns_ctx->entry;

	if (g_is_random) {
		offset_in_ios = rand_r(&seed) % entry->size_in_ios;
	} else {
		offset_in_ios = ns_ctx->offset_in_ios++;
		if (ns_ctx->offset_in_ios == entry->size_in_ios) {
			ns_ctx->offset_in_ios = 0;
		}
	}

	task->is_read = false;
	task->submit_tsc = spdk_get_ticks();
	task->lba = offset_in_ios * entry->io_size_blocks;

	if ((g_rw_percentage == 100) ||
	    (g_rw_percentage != 0 && ((rand_r(&seed) % 100) < g_rw_percentage))) {
#if HAVE_LIBAIO
		if (entry->type == ENTRY_TYPE_AIO_FILE) {
			rc = aio_submit(ns_ctx->u.aio.ctx, &task->iocb, entry->u.aio.fd, IO_CMD_PREAD, task->buf,
					g_io_size_bytes, offset_in_ios * g_io_size_bytes, task);
		} else
#endif
		{
			task_extended_lba_setup_pi(entry, task, task->lba,
						   entry->io_size_blocks, false);
			task->is_read = true;

			rc = spdk_nvme_ns_cmd_read_with_md(entry->u.nvme.ns, ns_ctx->u.nvme.qpair,
							   task->buf, NULL,
							   task->lba,
							   entry->io_size_blocks, io_complete,
							   task, entry->io_flags,
							   task->appmask, task->apptag);
		}
	} else {
#if HAVE_LIBAIO
		if (entry->type == ENTRY_TYPE_AIO_FILE) {
			rc = aio_submit(ns_ctx->u.aio.ctx, &task->iocb, entry->u.aio.fd, IO_CMD_PWRITE, task->buf,
					g_io_size_bytes, offset_in_ios * g_io_size_bytes, task);
		} else
#endif
		{
			task_extended_lba_setup_pi(entry, task, task->lba,
						   entry->io_size_blocks, true);

			rc = spdk_nvme_ns_cmd_write_with_md(entry->u.nvme.ns, ns_ctx->u.nvme.qpair,
							    task->buf, NULL,
							    task->lba,
							    entry->io_size_blocks, io_complete,
							    task, entry->io_flags,
							    task->appmask, task->apptag);
		}
	}

	if (rc != 0) {
		fprintf(stderr, "starting I/O failed\n");
	} else {
		ns_ctx->current_queue_depth++;
	}
}

static void
task_complete(struct perf_task *task)
{
	struct ns_worker_ctx	*ns_ctx;
	uint64_t		tsc_diff;
	struct ns_entry		*entry;

	ns_ctx = task->ns_ctx;
	entry = ns_ctx->entry;
	ns_ctx->current_queue_depth--;
	ns_ctx->io_completed++;
	tsc_diff = spdk_get_ticks() - task->submit_tsc;
	ns_ctx->total_tsc += tsc_diff;
	if (ns_ctx->min_tsc > tsc_diff) {
		ns_ctx->min_tsc = tsc_diff;
	}
	if (ns_ctx->max_tsc < tsc_diff) {
		ns_ctx->max_tsc = tsc_diff;
	}
	if (g_latency_sw_tracking_level > 0) {
		spdk_histogram_data_tally(ns_ctx->histogram, tsc_diff);
	}

	/* add application level verification for end-to-end data protection */
	if (entry->type == ENTRY_TYPE_NVME_NS) {
		if (spdk_nvme_ns_supports_extended_lba(entry->u.nvme.ns) &&
		    task->is_read && !g_metacfg_pract_flag) {
			task_extended_lba_pi_verify(entry, task, task->lba,
						    entry->io_size_blocks);
		}
	}

	/*
	 * is_draining indicates when time has expired for the test run
	 * and we are just waiting for the previously submitted I/O
	 * to complete.  In this case, do not submit a new I/O to replace
	 * the one just completed.
	 */
	if (ns_ctx->is_draining) {
		spdk_dma_free(task->buf);
		free(task);
	} else {
		submit_single_io(task);
	}
}

static void
io_complete(void *ctx, const struct spdk_nvme_cpl *completion)
{
	task_complete((struct perf_task *)ctx);
}

static void
check_io(struct ns_worker_ctx *ns_ctx)
{
#if HAVE_LIBAIO
	if (ns_ctx->entry->type == ENTRY_TYPE_AIO_FILE) {
		aio_check_io(ns_ctx);
	} else
#endif
	{
		spdk_nvme_qpair_process_completions(ns_ctx->u.nvme.qpair, g_max_completions);
	}
}

static void
submit_io(struct ns_worker_ctx *ns_ctx, int queue_depth)
{
	struct perf_task *task;
	uint32_t max_io_size_bytes;

	while (queue_depth-- > 0) {
		task = calloc(1, sizeof(*task));
		if (task == NULL) {
			fprintf(stderr, "Out of memory allocating tasks\n");
			exit(1);
		}

		/* maximum extended lba format size from all active
		 * namespace, it's same with g_io_size_bytes for
		 * namespace without metadata
		 */
		max_io_size_bytes = g_io_size_bytes + g_max_io_md_size * g_max_io_size_blocks;
		task->buf = spdk_dma_zmalloc(max_io_size_bytes, g_io_align, NULL);
		if (task->buf == NULL) {
			fprintf(stderr, "task->buf spdk_dma_zmalloc failed\n");
			exit(1);
		}
		memset(task->buf, queue_depth % 8 + 1, max_io_size_bytes);

		task->ns_ctx = ns_ctx;

		submit_single_io(task);
	}
}

static void
drain_io(struct ns_worker_ctx *ns_ctx)
{
	ns_ctx->is_draining = true;
	while (ns_ctx->current_queue_depth > 0) {
		check_io(ns_ctx);
	}
}

static int
init_ns_worker_ctx(struct ns_worker_ctx *ns_ctx)
{
	if (ns_ctx->entry->type == ENTRY_TYPE_AIO_FILE) {
#ifdef HAVE_LIBAIO
		ns_ctx->u.aio.events = calloc(g_queue_depth, sizeof(struct io_event));
		if (!ns_ctx->u.aio.events) {
			return -1;
		}
		ns_ctx->u.aio.ctx = 0;
		if (io_setup(g_queue_depth, &ns_ctx->u.aio.ctx) < 0) {
			free(ns_ctx->u.aio.events);
			perror("io_setup");
			return -1;
		}
#endif
	} else {
		/*
		 * TODO: If a controller has multiple namespaces, they could all use the same queue.
		 *  For now, give each namespace/thread combination its own queue.
		 */
		struct spdk_nvme_io_qpair_opts opts;

		spdk_nvme_ctrlr_get_default_io_qpair_opts(ns_ctx->entry->u.nvme.ctrlr, &opts, sizeof(opts));
		if (opts.io_queue_requests < ns_ctx->entry->num_io_requests) {
			opts.io_queue_requests = ns_ctx->entry->num_io_requests;
		}

		ns_ctx->u.nvme.qpair = spdk_nvme_ctrlr_alloc_io_qpair(ns_ctx->entry->u.nvme.ctrlr, &opts,
				       sizeof(opts));
		if (!ns_ctx->u.nvme.qpair) {
			printf("ERROR: spdk_nvme_ctrlr_alloc_io_qpair failed\n");
			return -1;
		}
	}

	return 0;
}

static void
cleanup_ns_worker_ctx(struct ns_worker_ctx *ns_ctx)
{
	if (ns_ctx->entry->type == ENTRY_TYPE_AIO_FILE) {
#ifdef HAVE_LIBAIO
		io_destroy(ns_ctx->u.aio.ctx);
		free(ns_ctx->u.aio.events);
#endif
	} else {
		spdk_nvme_ctrlr_free_io_qpair(ns_ctx->u.nvme.qpair);
	}
}

static int
work_fn(void *arg)
{
	uint64_t tsc_end;
	struct worker_thread *worker = (struct worker_thread *)arg;
	struct ns_worker_ctx *ns_ctx = NULL;

	printf("Starting thread on core %u\n", worker->lcore);

	/* Allocate a queue pair for each namespace. */
	ns_ctx = worker->ns_ctx;
	while (ns_ctx != NULL) {
		if (init_ns_worker_ctx(ns_ctx) != 0) {
			printf("ERROR: init_ns_worker_ctx() failed\n");
			return 1;
		}
		ns_ctx = ns_ctx->next;
	}

	tsc_end = spdk_get_ticks() + g_time_in_sec * g_tsc_rate;

	/* Submit initial I/O for each namespace. */
	ns_ctx = worker->ns_ctx;
	while (ns_ctx != NULL) {
		submit_io(ns_ctx, g_queue_depth);
		ns_ctx = ns_ctx->next;
	}

	while (1) {
		/*
		 * Check for completed I/O for each controller. A new
		 * I/O will be submitted in the io_complete callback
		 * to replace each I/O that is completed.
		 */
		ns_ctx = worker->ns_ctx;
		while (ns_ctx != NULL) {
			check_io(ns_ctx);
			ns_ctx = ns_ctx->next;
		}

		if (spdk_get_ticks() > tsc_end) {
			break;
		}
	}

	ns_ctx = worker->ns_ctx;
	while (ns_ctx != NULL) {
		drain_io(ns_ctx);
		cleanup_ns_worker_ctx(ns_ctx);
		ns_ctx = ns_ctx->next;
	}

	return 0;
}

static void usage(char *program_name)
{
	printf("%s options", program_name);
#if HAVE_LIBAIO
	printf(" [AIO device(s)]...");
#endif
	printf("\n");
	printf("\t[-q io depth]\n");
	printf("\t[-o io size in bytes]\n");
	printf("\t[-w io pattern type, must be one of\n");
	printf("\t\t(read, write, randread, randwrite, rw, randrw)]\n");
	printf("\t[-M rwmixread (100 for reads, 0 for writes)]\n");
	printf("\t[-L enable latency tracking via sw, default: disabled]\n");
	printf("\t\t-L for latency summary, -LL for detailed histogram\n");
	printf("\t[-l enable latency tracking via ssd (if supported), default: disabled]\n");
	printf("\t[-t time in seconds]\n");
	printf("\t[-c core mask for I/O submission/completion.]\n");
	printf("\t\t(default: 1)]\n");
	printf("\t[-D disable submission queue in controller memory buffer, default: enabled]\n");
	printf("\t[-r Transport ID for local PCIe NVMe or NVMeoF]\n");
	printf("\t Format: 'key:value [key:value] ...'\n");
	printf("\t Keys:\n");
	printf("\t  trtype      Transport type (e.g. PCIe, RDMA)\n");
	printf("\t  adrfam      Address family (e.g. IPv4, IPv6)\n");
	printf("\t  traddr      Transport address (e.g. 0000:04:00.0 for PCIe or 192.168.100.8 for RDMA)\n");
	printf("\t  trsvcid     Transport service identifier (e.g. 4420)\n");
	printf("\t  subnqn      Subsystem NQN (default: %s)\n", SPDK_NVMF_DISCOVERY_NQN);
	printf("\t Example: -r 'trtype:PCIe traddr:0000:04:00.0' for PCIe or\n");
	printf("\t          -r 'trtype:RDMA adrfam:IPv4 traddr:192.168.100.8 trsvcid:4420' for NVMeoF\n");
	printf("\t[-e metadata configuration]\n");
	printf("\t Keys:\n");
	printf("\t  PRACT      Protection Information Action bit (PRACT=1 or PRACT=0)\n");
	printf("\t  PRCHK      Control of Protection Information Checking (PRCHK=GUARD|REFTAG|APPTAG)\n");
	printf("\t Example: -e 'PRACT=0,PRCHK=GUARD|REFTAG|APPTAG'\n");
	printf("\t          -e 'PRACT=1,PRCHK=GUARD'\n");
	printf("\t[-s DPDK huge memory size in MB.]\n");
	printf("\t[-m max completions per poll]\n");
	printf("\t\t(default: 0 - unlimited)\n");
	printf("\t[-i shared memory group ID]\n");
}

static void
check_cutoff(void *ctx, uint64_t start, uint64_t end, uint64_t count,
	     uint64_t total, uint64_t so_far)
{
	double so_far_pct;
	double **cutoff = ctx;

	if (count == 0) {
		return;
	}

	so_far_pct = (double)so_far / total;
	while (so_far_pct >= **cutoff && **cutoff > 0) {
		printf("%9.5f%% : %9.3fus\n", **cutoff * 100, (double)end * 1000 * 1000 / g_tsc_rate);
		(*cutoff)++;
	}
}

static void
print_bucket(void *ctx, uint64_t start, uint64_t end, uint64_t count,
	     uint64_t total, uint64_t so_far)
{
	double so_far_pct;

	if (count == 0) {
		return;
	}

	so_far_pct = (double)so_far * 100 / total;
	printf("%9.3f - %9.3f: %9.4f%%  (%9ju)\n",
	       (double)start * 1000 * 1000 / g_tsc_rate,
	       (double)end * 1000 * 1000 / g_tsc_rate,
	       so_far_pct, count);
}

static void
print_performance(void)
{
	uint64_t total_io_completed, total_io_tsc;
	double io_per_second, mb_per_second, average_latency, min_latency, max_latency;
	double sum_ave_latency, min_latency_so_far, max_latency_so_far;
	double total_io_per_second, total_mb_per_second;
	int ns_count;
	struct worker_thread	*worker;
	struct ns_worker_ctx	*ns_ctx;

	total_io_per_second = 0;
	total_mb_per_second = 0;
	total_io_completed = 0;
	total_io_tsc = 0;
	min_latency_so_far = (double)UINT64_MAX;
	max_latency_so_far = 0;
	ns_count = 0;

	printf("========================================================\n");
	printf("%103s\n", "Latency(us)");
	printf("%-55s: %10s %10s %10s %10s %10s\n",
	       "Device Information", "IOPS", "MB/s", "Average", "min", "max");

	worker = g_workers;
	while (worker) {
		ns_ctx = worker->ns_ctx;
		while (ns_ctx) {
			if (ns_ctx->io_completed != 0) {
				io_per_second = (double)ns_ctx->io_completed / g_time_in_sec;
				mb_per_second = io_per_second * g_io_size_bytes / (1024 * 1024);
				average_latency = ((double)ns_ctx->total_tsc / ns_ctx->io_completed) * 1000 * 1000 / g_tsc_rate;
				min_latency = (double)ns_ctx->min_tsc * 1000 * 1000 / g_tsc_rate;
				if (min_latency < min_latency_so_far) {
					min_latency_so_far = min_latency;
				}

				max_latency = (double)ns_ctx->max_tsc * 1000 * 1000 / g_tsc_rate;
				if (max_latency > max_latency_so_far) {
					max_latency_so_far = max_latency;
				}

				printf("%-43.43s from core %u: %10.2f %10.2f %10.2f %10.2f %10.2f\n",
				       ns_ctx->entry->name, worker->lcore,
				       io_per_second, mb_per_second,
				       average_latency, min_latency, max_latency);
				total_io_per_second += io_per_second;
				total_mb_per_second += mb_per_second;
				total_io_completed += ns_ctx->io_completed;
				total_io_tsc += ns_ctx->total_tsc;
				ns_count++;
			}
			ns_ctx = ns_ctx->next;
		}
		worker = worker->next;
	}

	if (ns_count != 0 && total_io_completed) {
		sum_ave_latency = ((double)total_io_tsc / total_io_completed) * 1000 * 1000 / g_tsc_rate;
		printf("========================================================\n");
		printf("%-55s: %10.2f %10.2f %10.2f %10.2f %10.2f\n",
		       "Total", total_io_per_second, total_mb_per_second,
		       sum_ave_latency, min_latency_so_far, max_latency_so_far);
		printf("\n");
	}

	if (g_latency_sw_tracking_level == 0 || total_io_completed == 0) {
		return;
	}

	worker = g_workers;
	while (worker) {
		ns_ctx = worker->ns_ctx;
		while (ns_ctx) {
			const double *cutoff = g_latency_cutoffs;

			printf("Summary latency data for %-43.43s from core %u:\n", ns_ctx->entry->name, worker->lcore);
			printf("=================================================================================\n");

			spdk_histogram_data_iterate(ns_ctx->histogram, check_cutoff, &cutoff);

			printf("\n");
			ns_ctx = ns_ctx->next;
		}
		worker = worker->next;
	}

	if (g_latency_sw_tracking_level == 1) {
		return;
	}

	worker = g_workers;
	while (worker) {
		ns_ctx = worker->ns_ctx;
		while (ns_ctx) {
			printf("Latency histogram for %-43.43s from core %u:\n", ns_ctx->entry->name, worker->lcore);
			printf("==============================================================================\n");
			printf("       Range in us     Cumulative    IO count\n");

			spdk_histogram_data_iterate(ns_ctx->histogram, print_bucket, NULL);
			printf("\n");
			ns_ctx = ns_ctx->next;
		}
		worker = worker->next;
	}

}

static void
print_latency_page(struct ctrlr_entry *entry)
{
	int i;

	printf("\n");
	printf("%s\n", entry->name);
	printf("--------------------------------------------------------\n");

	for (i = 0; i < 32; i++) {
		if (entry->latency_page->buckets_32us[i]) {
			printf("Bucket %dus - %dus: %d\n", i * 32, (i + 1) * 32, entry->latency_page->buckets_32us[i]);
		}
	}
	for (i = 0; i < 31; i++) {
		if (entry->latency_page->buckets_1ms[i]) {
			printf("Bucket %dms - %dms: %d\n", i + 1, i + 2, entry->latency_page->buckets_1ms[i]);
		}
	}
	for (i = 0; i < 31; i++) {
		if (entry->latency_page->buckets_32ms[i])
			printf("Bucket %dms - %dms: %d\n", (i + 1) * 32, (i + 2) * 32,
			       entry->latency_page->buckets_32ms[i]);
	}
}

static void
print_latency_statistics(const char *op_name, enum spdk_nvme_intel_log_page log_page)
{
	struct ctrlr_entry	*ctrlr;

	printf("%s Latency Statistics:\n", op_name);
	printf("========================================================\n");
	ctrlr = g_controllers;
	while (ctrlr) {
		if (spdk_nvme_ctrlr_is_log_page_supported(ctrlr->ctrlr, log_page)) {
			if (spdk_nvme_ctrlr_cmd_get_log_page(ctrlr->ctrlr, log_page, SPDK_NVME_GLOBAL_NS_TAG,
							     ctrlr->latency_page, sizeof(struct spdk_nvme_intel_rw_latency_page), 0,
							     enable_latency_tracking_complete,
							     NULL)) {
				printf("nvme_ctrlr_cmd_get_log_page() failed\n");
				exit(1);
			}

			g_outstanding_commands++;
		} else {
			printf("Controller %s: %s latency statistics not supported\n", ctrlr->name, op_name);
		}
		ctrlr = ctrlr->next;
	}

	while (g_outstanding_commands) {
		ctrlr = g_controllers;
		while (ctrlr) {
			spdk_nvme_ctrlr_process_admin_completions(ctrlr->ctrlr);
			ctrlr = ctrlr->next;
		}
	}

	ctrlr = g_controllers;
	while (ctrlr) {
		if (spdk_nvme_ctrlr_is_log_page_supported(ctrlr->ctrlr, log_page)) {
			print_latency_page(ctrlr);
		}
		ctrlr = ctrlr->next;
	}
	printf("\n");
}

static void
print_stats(void)
{
	print_performance();
	if (g_latency_ssd_tracking_enable) {
		if (g_rw_percentage != 0) {
			print_latency_statistics("Read", SPDK_NVME_INTEL_LOG_READ_CMD_LATENCY);
		}
		if (g_rw_percentage != 100) {
			print_latency_statistics("Write", SPDK_NVME_INTEL_LOG_WRITE_CMD_LATENCY);
		}
	}
}

static void
unregister_trids(void)
{
	struct trid_entry *trid_entry, *tmp;

	TAILQ_FOREACH_SAFE(trid_entry, &g_trid_list, tailq, tmp) {
		free(trid_entry);
	}
}

static int
add_trid(const char *trid_str)
{
	struct trid_entry *trid_entry;
	struct spdk_nvme_transport_id *trid;
	char *ns;

	trid_entry = calloc(1, sizeof(*trid_entry));
	if (trid_entry == NULL) {
		return -1;
	}

	trid = &trid_entry->trid;
	memset(trid, 0, sizeof(*trid));
	trid->trtype = SPDK_NVME_TRANSPORT_PCIE;
	snprintf(trid->subnqn, sizeof(trid->subnqn), "%s", SPDK_NVMF_DISCOVERY_NQN);

	if (spdk_nvme_transport_id_parse(trid, trid_str) != 0) {
		fprintf(stderr, "Invalid transport ID format '%s'\n", trid_str);
		free(trid_entry);
		return 1;
	}

	ns = strcasestr(trid_str, "ns:");
	if (ns) {
		char nsid_str[6]; /* 5 digits maximum in an nsid */
		int len;
		int nsid;

		ns += 3;

		len = strcspn(ns, " \t\n");
		if (len > 5) {
			fprintf(stderr, "NVMe namespace IDs must be 5 digits or less\n");
			free(trid_entry);
			return 1;
		}

		memcpy(nsid_str, ns, len);
		nsid_str[len] = '\0';

		nsid = atoi(nsid_str);
		if (nsid <= 0 || nsid > 65535) {
			fprintf(stderr, "NVMe namespace IDs must be less than 65536 and greater than 0\n");
			free(trid_entry);
			return 1;
		}

		trid_entry->nsid = (uint16_t)nsid;
	}

	TAILQ_INSERT_TAIL(&g_trid_list, trid_entry, tailq);
	return 0;
}

static int
parse_metadata(const char *metacfg_str)
{
	const char *sep;

	if (strstr(metacfg_str, "PRACT=1") != NULL) {
		g_metacfg_pract_flag = SPDK_NVME_IO_FLAGS_PRACT;
	}

	sep = strchr(metacfg_str, ',');
	if (!sep) {
		return 0;
	}

	if (strstr(sep, "PRCHK=") != NULL) {
		if (strstr(sep, "GUARD") != NULL) {
			g_metacfg_prchk_flags = SPDK_NVME_IO_FLAGS_PRCHK_GUARD;
		}
		if (strstr(sep, "REFTAG") != NULL) {
			g_metacfg_prchk_flags |= SPDK_NVME_IO_FLAGS_PRCHK_REFTAG;
		}
		if (strstr(sep, "APPTAG") != NULL) {
			g_metacfg_prchk_flags |= SPDK_NVME_IO_FLAGS_PRCHK_APPTAG;
		}
	}

	return 0;
}

static int
parse_args(int argc, char **argv)
{
	const char *workload_type;
	int op;
	bool mix_specified = false;

	/* default value */
	g_queue_depth = 0;
	g_io_size_bytes = 0;
	workload_type = NULL;
	g_time_in_sec = 0;
	g_rw_percentage = -1;
	g_core_mask = NULL;
	g_max_completions = 0;

	while ((op = getopt(argc, argv, "c:e:i:lm:o:q:r:s:t:w:DLM:")) != -1) {
		switch (op) {
		case 'c':
			g_core_mask = optarg;
			break;
		case 'e':
			if (parse_metadata(optarg)) {
				usage(argv[0]);
				return 1;
			}
			break;
		case 'i':
			g_shm_id = atoi(optarg);
			break;
		case 'l':
			g_latency_ssd_tracking_enable = true;
			break;
		case 'm':
			g_max_completions = atoi(optarg);
			break;
		case 'o':
			g_io_size_bytes = atoi(optarg);
			break;
		case 'q':
			g_queue_depth = atoi(optarg);
			break;
		case 'r':
			if (add_trid(optarg)) {
				usage(argv[0]);
				return 1;
			}
			break;
		case 's':
			g_dpdk_mem = atoi(optarg);
			break;
		case 't':
			g_time_in_sec = atoi(optarg);
			break;
		case 'w':
			workload_type = optarg;
			break;
		case 'D':
			g_disable_sq_cmb = 1;
			break;
		case 'L':
			g_latency_sw_tracking_level++;
			break;
		case 'M':
			g_rw_percentage = atoi(optarg);
			mix_specified = true;
			break;
		default:
			usage(argv[0]);
			return 1;
		}
	}

	if (!g_queue_depth) {
		usage(argv[0]);
		return 1;
	}
	if (!g_io_size_bytes) {
		usage(argv[0]);
		return 1;
	}
	if (!workload_type) {
		usage(argv[0]);
		return 1;
	}
	if (!g_time_in_sec) {
		usage(argv[0]);
		return 1;
	}

	if (strcmp(workload_type, "read") &&
	    strcmp(workload_type, "write") &&
	    strcmp(workload_type, "randread") &&
	    strcmp(workload_type, "randwrite") &&
	    strcmp(workload_type, "rw") &&
	    strcmp(workload_type, "randrw")) {
		fprintf(stderr,
			"io pattern type must be one of\n"
			"(read, write, randread, randwrite, rw, randrw)\n");
		return 1;
	}

	if (!strcmp(workload_type, "read") ||
	    !strcmp(workload_type, "randread")) {
		g_rw_percentage = 100;
	}

	if (!strcmp(workload_type, "write") ||
	    !strcmp(workload_type, "randwrite")) {
		g_rw_percentage = 0;
	}

	if (!strcmp(workload_type, "read") ||
	    !strcmp(workload_type, "randread") ||
	    !strcmp(workload_type, "write") ||
	    !strcmp(workload_type, "randwrite")) {
		if (mix_specified) {
			fprintf(stderr, "Ignoring -M option... Please use -M option"
				" only when using rw or randrw.\n");
		}
	}

	if (!strcmp(workload_type, "rw") ||
	    !strcmp(workload_type, "randrw")) {
		if (g_rw_percentage < 0 || g_rw_percentage > 100) {
			fprintf(stderr,
				"-M must be specified to value from 0 to 100 "
				"for rw or randrw.\n");
			return 1;
		}
	}

	if (!strcmp(workload_type, "read") ||
	    !strcmp(workload_type, "write") ||
	    !strcmp(workload_type, "rw")) {
		g_is_random = 0;
	} else {
		g_is_random = 1;
	}

	if (TAILQ_EMPTY(&g_trid_list)) {
		/* If no transport IDs specified, default to enumerating all local PCIe devices */
		add_trid("trtype:PCIe");
	} else {
		struct trid_entry *trid_entry, *trid_entry_tmp;

		g_no_pci = true;
		/* check whether there is local PCIe type */
		TAILQ_FOREACH_SAFE(trid_entry, &g_trid_list, tailq, trid_entry_tmp) {
			if (trid_entry->trid.trtype == SPDK_NVME_TRANSPORT_PCIE) {
				g_no_pci = false;
				break;
			}
		}
	}

	g_aio_optind = optind;

	return 0;
}

static int
register_workers(void)
{
	uint32_t i;
	struct worker_thread *worker;

	g_workers = NULL;
	g_num_workers = 0;

	SPDK_ENV_FOREACH_CORE(i) {
		worker = calloc(1, sizeof(*worker));
		if (worker == NULL) {
			fprintf(stderr, "Unable to allocate worker\n");
			return -1;
		}

		worker->lcore = i;
		worker->next = g_workers;
		g_workers = worker;
		g_num_workers++;
	}

	return 0;
}

static void
unregister_workers(void)
{
	struct worker_thread *worker = g_workers;

	/* Free namespace context and worker thread */
	while (worker) {
		struct worker_thread *next_worker = worker->next;
		struct ns_worker_ctx *ns_ctx = worker->ns_ctx;

		while (ns_ctx) {
			struct ns_worker_ctx *next_ns_ctx = ns_ctx->next;
			spdk_histogram_data_free(ns_ctx->histogram);
			free(ns_ctx);
			ns_ctx = next_ns_ctx;
		}

		free(worker);
		worker = next_worker;
	}
}

static bool
probe_cb(void *cb_ctx, const struct spdk_nvme_transport_id *trid,
	 struct spdk_nvme_ctrlr_opts *opts)
{
	if (trid->trtype != SPDK_NVME_TRANSPORT_PCIE) {
		printf("Attaching to NVMe over Fabrics controller at %s:%s: %s\n",
		       trid->traddr, trid->trsvcid,
		       trid->subnqn);
	} else {
		if (g_disable_sq_cmb) {
			opts->use_cmb_sqs = false;
		}

		printf("Attaching to NVMe Controller at %s\n",
		       trid->traddr);
	}

	/* Set io_queue_size to UINT16_MAX, NVMe driver
	 * will then reduce this to MQES to maximize
	 * the io_queue_size as much as possible.
	 */
	opts->io_queue_size = UINT16_MAX;

	return true;
}

static void
attach_cb(void *cb_ctx, const struct spdk_nvme_transport_id *trid,
	  struct spdk_nvme_ctrlr *ctrlr, const struct spdk_nvme_ctrlr_opts *opts)
{
	struct trid_entry	*trid_entry = cb_ctx;
	struct spdk_pci_addr	pci_addr;
	struct spdk_pci_device	*pci_dev;
	struct spdk_pci_id	pci_id;

	g_controllers_found++;
	if (trid->trtype != SPDK_NVME_TRANSPORT_PCIE) {
		printf("Attached to NVMe over Fabrics controller at %s:%s: %s\n",
		       trid->traddr, trid->trsvcid,
		       trid->subnqn);
	} else {
		if (spdk_pci_addr_parse(&pci_addr, trid->traddr)) {
			return;
		}

		pci_dev = spdk_nvme_ctrlr_get_pci_device(ctrlr);
		if (!pci_dev) {
			return;
		}

		pci_id = spdk_pci_device_get_id(pci_dev);

		printf("Attached to NVMe Controller at %s [%04x:%04x]\n",
		       trid->traddr,
		       pci_id.vendor_id, pci_id.device_id);
	}

	register_ctrlr(ctrlr, trid_entry);
}

static int
register_controllers(void)
{
	struct trid_entry *trid_entry;

	printf("Initializing NVMe Controllers\n");

	TAILQ_FOREACH(trid_entry, &g_trid_list, tailq) {
		if (spdk_nvme_probe(&trid_entry->trid, trid_entry, probe_cb, attach_cb, NULL) != 0) {
			fprintf(stderr, "spdk_nvme_probe() failed for transport address '%s'\n",
				trid_entry->trid.traddr);
			return -1;
		}
	}

	return 0;
}

static void
unregister_controllers(void)
{
	struct ctrlr_entry *entry = g_controllers;

	while (entry) {
		struct ctrlr_entry *next = entry->next;
		spdk_dma_free(entry->latency_page);
		if (g_latency_ssd_tracking_enable &&
		    spdk_nvme_ctrlr_is_feature_supported(entry->ctrlr, SPDK_NVME_INTEL_FEAT_LATENCY_TRACKING)) {
			set_latency_tracking_feature(entry->ctrlr, false);
		}
		spdk_nvme_detach(entry->ctrlr);
		free(entry);
		entry = next;
	}
}

static int
register_aio_files(int argc, char **argv)
{
#if HAVE_LIBAIO
	int i;

	/* Treat everything after the options as files for AIO */
	for (i = g_aio_optind; i < argc; i++) {
		if (register_aio_file(argv[i]) != 0) {
			return 1;
		}
	}
#endif /* HAVE_LIBAIO */

	return 0;
}

static int
associate_workers_with_ns(void)
{
	struct ns_entry		*entry = g_namespaces;
	struct worker_thread	*worker = g_workers;
	struct ns_worker_ctx	*ns_ctx;
	int			i, count;

	count = g_num_namespaces > g_num_workers ? g_num_namespaces : g_num_workers;

	for (i = 0; i < count; i++) {
		if (entry == NULL) {
			break;
		}

		ns_ctx = malloc(sizeof(struct ns_worker_ctx));
		if (!ns_ctx) {
			return -1;
		}
		memset(ns_ctx, 0, sizeof(*ns_ctx));

		printf("Associating %s with lcore %d\n", entry->name, worker->lcore);
		ns_ctx->min_tsc = UINT64_MAX;
		ns_ctx->entry = entry;
		ns_ctx->next = worker->ns_ctx;
		ns_ctx->histogram = spdk_histogram_data_alloc();
		worker->ns_ctx = ns_ctx;

		worker = worker->next;
		if (worker == NULL) {
			worker = g_workers;
		}

		entry = entry->next;
		if (entry == NULL) {
			entry = g_namespaces;
		}

	}

	return 0;
}

int main(int argc, char **argv)
{
	int rc;
	struct worker_thread *worker, *master_worker;
	unsigned master_core;
	struct spdk_env_opts opts;

	rc = parse_args(argc, argv);
	if (rc != 0) {
		return rc;
	}

	spdk_env_opts_init(&opts);
	opts.name = "perf";
	opts.shm_id = g_shm_id;
	if (g_core_mask) {
		opts.core_mask = g_core_mask;
	}

	if (g_dpdk_mem) {
		opts.mem_size = g_dpdk_mem;
	}
	if (g_no_pci) {
		opts.no_pci = g_no_pci;
	}
	if (spdk_env_init(&opts) < 0) {
		fprintf(stderr, "Unable to initialize SPDK env\n");
		rc = -1;
		goto cleanup;
	}

	g_tsc_rate = spdk_get_ticks_hz();

	if (register_workers() != 0) {
		rc = -1;
		goto cleanup;
	}

	if (register_aio_files(argc, argv) != 0) {
		rc = -1;
		goto cleanup;
	}

	if (register_controllers() != 0) {
		rc = -1;
		goto cleanup;
	}

	if (g_warn) {
		printf("WARNING: Some requested NVMe devices were skipped\n");
	}

	if (g_num_namespaces == 0) {
		fprintf(stderr, "No valid NVMe controllers or AIO devices found\n");
		return 0;
	}

	if (associate_workers_with_ns() != 0) {
		rc = -1;
		goto cleanup;
	}

	printf("Initialization complete. Launching workers.\n");

	/* Launch all of the slave workers */
	master_core = spdk_env_get_current_core();
	master_worker = NULL;
	worker = g_workers;
	while (worker != NULL) {
		if (worker->lcore != master_core) {
			spdk_env_thread_launch_pinned(worker->lcore, work_fn, worker);
		} else {
			assert(master_worker == NULL);
			master_worker = worker;
		}
		worker = worker->next;
	}

	assert(master_worker != NULL);
	rc = work_fn(master_worker);

	spdk_env_thread_wait_all();

	print_stats();

cleanup:
	unregister_trids();
	unregister_namespaces();
	unregister_controllers();
	unregister_workers();

	if (rc != 0) {
		fprintf(stderr, "%s: errors occured\n", argv[0]);
	}

	return rc;
}