/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (C) 2012-2013 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/param.h>
#include <sys/ioccom.h>

#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#include "nvmecontrol.h"

/* Tables for command line parsing */

static cmd_fn_t perftest;

#define NONE 0xffffffffu
static struct options {
        bool            perthread;
        uint32_t        threads;
        uint32_t        size;
        uint32_t        time;
        const char      *op;
        const char      *intr;
        const char      *flags;
        const char      *dev;
} opt = {
        .perthread = false,
        .threads = 0,
        .size = 0,
        .time = 0,
        .op = NULL,
        .intr = NULL,
        .flags = NULL,
        .dev = NULL,
};


static const struct opts perftest_opts[] = {
#define OPT(l, s, t, opt, addr, desc) { l, s, t, &opt.addr, desc }
        OPT("perthread", 'p', arg_none, opt, perthread,
            "Report per-thread results"),
        OPT("threads", 'n', arg_uint32, opt, threads,
            "Number of threads to run"),
        OPT("size", 's', arg_uint32, opt, size,
            "Size of the test"),
        OPT("time", 't', arg_uint32, opt, time,
            "How long to run the test in seconds"),
        OPT("operation", 'o', arg_string, opt, op,
            "Operation type: 'read' or 'write'"),
        OPT("interrupt", 'i', arg_string, opt, intr,
            "Interrupt mode: 'intr' or 'wait'"),
        OPT("flags", 'f', arg_string, opt, flags,
            "Turn on testing flags: refthread"),
        { NULL, 0, arg_none, NULL, NULL }
};
#undef OPT

static const struct args perftest_args[] = {
        { arg_string, &opt.dev, "namespace-id" },
        { arg_none, NULL, NULL },
};

static struct cmd perftest_cmd = {
        .name = "perftest",
        .fn = perftest,
        .descr = "Perform low-level performance testing",
        .ctx_size = sizeof(opt),
        .opts = perftest_opts,
        .args = perftest_args,
};

CMD_COMMAND(perftest_cmd);

/* End of tables for command line parsing */

static void
print_perftest(struct nvme_io_test *io_test, bool perthread)
{
        uint64_t        io_completed = 0, iops, mbps;
        uint32_t        i;

        for (i = 0; i < io_test->num_threads; i++)
                io_completed += io_test->io_completed[i];

        iops = io_completed/io_test->time;
        mbps = iops * io_test->size / (1024*1024);

        printf("Threads: %2d Size: %6d %5s Time: %3d IO/s: %7ju MB/s: %4ju\n",
            io_test->num_threads, io_test->size,
            io_test->opc == NVME_OPC_READ ? "READ" : "WRITE",
            io_test->time, (uintmax_t)iops, (uintmax_t)mbps);

        if (perthread)
                for (i = 0; i < io_test->num_threads; i++)
                        printf("\t%3d: %8ju IO/s\n", i,
                            (uintmax_t)io_test->io_completed[i]/io_test->time);
}

static void
perftest(const struct cmd *f, int argc, char *argv[])
{
        struct nvme_io_test             io_test;
        int                             fd;
        u_long                          ioctl_cmd = NVME_IO_TEST;

        memset(&io_test, 0, sizeof(io_test));
        if (arg_parse(argc, argv, f))
                return;
        
        if (opt.op == NULL)
                arg_help(argc, argv, f);
        if (opt.flags != NULL && strcmp(opt.flags, "refthread") == 0)
                io_test.flags |= NVME_TEST_FLAG_REFTHREAD;
        if (opt.intr != NULL) {
                if (strcmp(opt.intr, "bio") == 0 ||
                    strcmp(opt.intr, "wait") == 0)
                        ioctl_cmd = NVME_BIO_TEST;
                else if (strcmp(opt.intr, "io") == 0 ||
                    strcmp(opt.intr, "intr") == 0)
                        ioctl_cmd = NVME_IO_TEST;
                else {
                        fprintf(stderr, "Unknown interrupt test type %s\n", opt.intr);
                        arg_help(argc, argv, f);
                }
        }
        if (opt.threads <= 0 || opt.threads > 128) {
                fprintf(stderr, "Bad number of threads %d\n", opt.threads);
                arg_help(argc, argv, f);
        }
        io_test.num_threads = opt.threads;
        if (strcasecmp(opt.op, "read") == 0)
                io_test.opc = NVME_OPC_READ;
        else if (strcasecmp(opt.op, "write") == 0)
                io_test.opc = NVME_OPC_WRITE;
        else {
                fprintf(stderr, "\"%s\" not valid opcode.\n", opt.op);
                arg_help(argc, argv, f);
        }
        if (opt.time == 0) {
                fprintf(stderr, "No time specified\n");
                arg_help(argc, argv, f);
        }
        io_test.time = opt.time;
        io_test.size = opt.size;
        open_dev(opt.dev, &fd, 1, 1);
        if (ioctl(fd, ioctl_cmd, &io_test) < 0)
                err(EX_IOERR, "ioctl NVME_IO_TEST failed");

        close(fd);
        print_perftest(&io_test, opt.perthread);
        exit(0);
}