/*-
 * 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/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/ioccom.h>
#include <sys/stat.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.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"

typedef void (*nvme_fn_t)(int argc, char *argv[]);

struct nvme_function {
	const char	*name;
	nvme_fn_t	fn;
	const char	*usage;
} funcs[] = {
	{"devlist",	devlist,	DEVLIST_USAGE},
	{"identify",	identify,	IDENTIFY_USAGE},
	{"perftest",	perftest,	PERFTEST_USAGE},
	{"reset",	reset,		RESET_USAGE},
	{NULL,		NULL,		NULL},
};

static void
usage(void)
{
	struct nvme_function *f;

	f = funcs;
	fprintf(stderr, "usage:\n");
	while (f->name != NULL) {
		fprintf(stderr, "%s", f->usage);
		f++;
	}
	exit(EX_USAGE);
}

void
read_controller_data(int fd, struct nvme_controller_data *cdata)
{
	struct nvme_pt_command	pt;

	memset(&pt, 0, sizeof(pt));
	pt.cmd.opc = NVME_OPC_IDENTIFY;
	pt.cmd.cdw10 = 1;
	pt.buf = cdata;
	pt.len = sizeof(*cdata);
	pt.is_read = 1;

	if (ioctl(fd, NVME_PASSTHROUGH_CMD, &pt) < 0) {
		printf("Identify request failed. errno=%d (%s)\n",
		    errno, strerror(errno));
		exit(EX_IOERR);
	}

	if (nvme_completion_is_error(&pt.cpl)) {
		printf("Passthrough command returned error.\n");
		exit(EX_IOERR);
	}
}

void
read_namespace_data(int fd, int nsid, struct nvme_namespace_data *nsdata)
{
	struct nvme_pt_command	pt;

	memset(&pt, 0, sizeof(pt));
	pt.cmd.opc = NVME_OPC_IDENTIFY;
	pt.cmd.nsid = nsid;
	pt.buf = nsdata;
	pt.len = sizeof(*nsdata);
	pt.is_read = 1;

	if (ioctl(fd, NVME_PASSTHROUGH_CMD, &pt) < 0) {
		printf("Identify request failed. errno=%d (%s)\n",
		    errno, strerror(errno));
		exit(EX_IOERR);
	}

	if (nvme_completion_is_error(&pt.cpl)) {
		printf("Passthrough command returned error.\n");
		exit(EX_IOERR);
	}
}

int
open_dev(const char *str, int *fd, int show_error, int exit_on_error)
{
	struct stat	devstat;
	char		full_path[64];

	if (!strnstr(str, NVME_CTRLR_PREFIX, strlen(NVME_CTRLR_PREFIX))) {
		if (show_error)
			fprintf(stderr,
			    "Controller/namespace IDs must begin with '%s'.\n",
			    NVME_CTRLR_PREFIX);
		if (exit_on_error)
			exit(EX_USAGE);
		else
			return (EX_USAGE);
	}

	snprintf(full_path, sizeof(full_path), "/dev/%s", str);
	if (stat(full_path, &devstat) != 0) {
		if (show_error)
			fprintf(stderr, "Could not stat %s. errno=%d (%s)\n",
			    full_path, errno, strerror(errno));
		if (exit_on_error)
			exit(EX_NOINPUT);
		else
			return (EX_NOINPUT);
	}

	*fd = open(full_path, O_RDWR);
	if (*fd < 0) {
		if (show_error)
			fprintf(stderr, "Could not open %s. errno=%d (%s)\n",
			    full_path, errno, strerror(errno));
		if (exit_on_error)
			exit(EX_NOPERM);
		else
			return (EX_NOPERM);
	}

	return (EX_OK);
}

int
main(int argc, char *argv[])
{
	struct nvme_function *f;

	if (argc < 2)
		usage();

	f = funcs;
	while (f->name != NULL) {
		if (strcmp(argv[1], f->name) == 0)
			f->fn(argc-1, &argv[1]);
		f++;
	}

	usage();

	return (0);
}