/*-
 * 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/nv.h>
#include <sys/time.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <libnvmf.h>
#include <libutil.h>
#include <paths.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>

#include "nvmecontrol.h"
#include "comnd.h"

/* Tables for command line parsing */

#define NVME_MAX_UNIT 256

static cmd_fn_t devlist;

static struct options {
        bool    human;
} opt = {
        .human = false,
};

static const struct opts devlist_opts[] = {
#define OPT(l, s, t, opt, addr, desc) { l, s, t, &opt.addr, desc }
        OPT("human", 'h', arg_none, opt, human,
            "Show human readable disk size"),
        { NULL, 0, arg_none, NULL, NULL }
};
#undef OPT

static struct cmd devlist_cmd = {
        .name = "devlist",
        .fn = devlist,
        .descr = "List NVMe controllers and namespaces",
        .ctx_size = sizeof(opt),
        .opts = devlist_opts,
        .args = NULL,
};

CMD_COMMAND(devlist_cmd);

/* End of tables for command line parsing */

static inline uint32_t
ns_get_sector_size(struct nvme_namespace_data *nsdata)
{
        uint8_t flbas_fmt, lbads;

        flbas_fmt = NVMEV(NVME_NS_DATA_FLBAS_FORMAT, nsdata->flbas);
        lbads = NVMEV(NVME_NS_DATA_LBAF_LBADS, nsdata->lbaf[flbas_fmt]);

        return (1 << lbads);
}

static void
scan_namespace(int fd, int ctrlr, uint32_t nsid)
{
        struct nvme_namespace_data      nsdata;
        char                            name[64];
        uint8_t                         buf[7];
        uint64_t                        size;

        if (read_namespace_data(fd, nsid, &nsdata) != 0)
                return;
        if (nsdata.nsze == 0)
                return;
        snprintf(name, sizeof(name), "%s%d%s%d", NVME_CTRLR_PREFIX, ctrlr,
            NVME_NS_PREFIX, nsid);
        size = nsdata.nsze * (uint64_t)ns_get_sector_size(&nsdata);
        if (opt.human) {
                humanize_number(buf, sizeof(buf), size, "B",
                    HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
                printf("  %10s (%s)\n", name, buf);
        } else {
                printf("  %10s (%juMB)\n", name, (uintmax_t)size / 1024 / 1024);
        }
}

static bool
print_controller_info(const char *name, int fd)
{
        static struct timespec          now;
        struct nvme_controller_data     cdata;
        struct timespec                 last_disconnect, delta;
        uint8_t                         mn[64];
        nvlist_t                        *nvl;
        const nvlist_t                  *nvl_ts;
        bool                            connected;

        /*
         * If the controller doesn't support connection status, assume
         * it is connected.
         */
        if (nvmf_connection_status(fd, &nvl) != 0) {
                connected = true;
                nvl = NULL;
        } else {
                connected = nvlist_get_bool(nvl, "connected");
        }

        if (connected) {
                if (read_controller_data(fd, &cdata) != 0) {
                        nvlist_destroy(nvl);
                        return (false);
                }
        } else {
                if (ioctl(fd, NVME_GET_CONTROLLER_DATA, &cdata) == -1) {
                        nvlist_destroy(nvl);
                        return (false);
                }
        }

        nvme_strvis(mn, cdata.mn, sizeof(mn), NVME_MODEL_NUMBER_LENGTH);
        printf("%6s: %s", name, mn);
        if (connected) {
                const struct nvme_discovery_log_entry *dle;
                size_t len;

                nvlist_destroy(nvl);
                if (nvmf_reconnect_params(fd, &nvl) == 0) {
                        dle = nvlist_get_binary(nvl, "dle", &len);
                        if (len == sizeof(*dle)) {
                                printf(" (connected via %s %.*s:%.*s)",
                                    nvmf_transport_type(dle->trtype),
                                    (int)sizeof(dle->traddr), dle->traddr,
                                    (int)sizeof(dle->trsvcid), dle->trsvcid);
                        }
                } else {
                        nvl = NULL;
                }
        } else {
                if (now.tv_sec == 0)
                        clock_gettime(CLOCK_REALTIME, &now);

                nvl_ts = nvlist_get_nvlist(nvl, "last_disconnect");
                last_disconnect.tv_sec = nvlist_get_number(nvl_ts, "tv_sec");
                last_disconnect.tv_nsec = nvlist_get_number(nvl_ts, "tv_nsec");
                timespecsub(&now, &last_disconnect, &delta);
                printf(" (disconnected for %ju seconds)",
                    (uintmax_t)delta.tv_sec);
        }
        printf("\n");
        nvlist_destroy(nvl);
        return (connected);
}

static bool
scan_controller(int ctrlr)
{
        struct nvme_ns_list             nslist;
        char                            name[64];
        uint32_t                        nsid;
        int                             fd, ret;

        snprintf(name, sizeof(name), "%s%d", NVME_CTRLR_PREFIX, ctrlr);

        ret = open_dev(name, &fd, 0, 0);

        if (ret == EACCES) {
                warnx("could not open "_PATH_DEV"%s\n", name);
                return (false);
        } else if (ret != 0)
                return (false);

        if (!print_controller_info(name, fd)) {
                close(fd);
                return (true);
        }

        nsid = 0;
        for (;;) {
                if (read_active_namespaces(fd, nsid, &nslist) != 0)
                        break;
                for (u_int i = 0; i < nitems(nslist.ns); i++) {
                        nsid = nslist.ns[i];
                        if (nsid == 0) {
                                break;
                        }

                        scan_namespace(fd, ctrlr, nsid);
                }
                if (nsid == 0 || nsid >= NVME_GLOBAL_NAMESPACE_TAG - 1)
                        break;
        }

        close(fd);
        return (true);
}

static void
devlist(const struct cmd *f, int argc, char *argv[])
{
        int                             ctrlr, found;

        if (arg_parse(argc, argv, f))
                return;

        ctrlr = -1;
        found = 0;

        while (ctrlr < NVME_MAX_UNIT) {
                ctrlr++;
                if (scan_controller(ctrlr))
                        found++;
        }

        if (found == 0) {
                printf("No NVMe controllers found.\n");
                exit(EX_UNAVAILABLE);
        }

        exit(0);
}