/*-
 *   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.
 */

#ifndef SPDK_NVMF_SUBSYSTEM_H
#define SPDK_NVMF_SUBSYSTEM_H

#include "nvmf_internal.h"

#include "spdk/nvme.h"
#include "spdk/queue.h"
#include "spdk/bdev.h"

struct spdk_nvmf_conn;
struct spdk_nvmf_subsystem;
struct spdk_nvmf_request;
struct nvmf_session;

#define MAX_VIRTUAL_NAMESPACE 16
#define MAX_SN_LEN 20

enum spdk_nvmf_subsystem_mode {
	NVMF_SUBSYSTEM_MODE_DIRECT	= 0,
	NVMF_SUBSYSTEM_MODE_VIRTUAL	= 1,
};

struct spdk_nvmf_listen_addr {
	char					*traddr;
	char					*trsvcid;
	const struct spdk_nvmf_transport	*transport;
	TAILQ_ENTRY(spdk_nvmf_listen_addr)	link;
};

struct spdk_nvmf_host {
	char				*nqn;
	TAILQ_ENTRY(spdk_nvmf_host)	link;
};

struct spdk_nvmf_ctrlr_ops {
	/**
	 * Get NVMe identify controller data.
	 */
	void (*ctrlr_get_data)(struct nvmf_session *session);

	/**
	 * Process admin command.
	 */
	int (*process_admin_cmd)(struct spdk_nvmf_request *req);

	/**
	 * Process IO command.
	 */
	int (*process_io_cmd)(struct spdk_nvmf_request *req);

	/**
	 * Poll for completions.
	 */
	void (*poll_for_completions)(struct nvmf_session *session);

	/**
	 * Detach the controller.
	 */
	void (*detach)(struct spdk_nvmf_subsystem *subsystem);
};

struct spdk_nvmf_controller {
	union {
		struct {
			struct nvmf_session *session;
			struct spdk_nvme_ctrlr *ctrlr;
			struct spdk_nvme_qpair *io_qpair;
		} direct;

		struct {
			struct nvmf_session *session;
			char	sn[MAX_SN_LEN + 1];
			struct spdk_bdev *ns_list[MAX_VIRTUAL_NAMESPACE];
			uint16_t ns_count;
		} virtual;
	} dev;

	const struct spdk_nvmf_ctrlr_ops *ops;
};


/*
 * The NVMf subsystem, as indicated in the specification, is a collection
 * of virtual controller sessions.  Any individual controller session has
 * access to all the NVMe device/namespaces maintained by the subsystem.
 */
struct spdk_nvmf_subsystem {
	uint16_t num;
	uint32_t lcore;
	char subnqn[SPDK_NVMF_NQN_MAX_LEN];
	enum spdk_nvmf_subsystem_mode mode;
	enum spdk_nvmf_subtype subtype;
	struct nvmf_session *session;
	struct spdk_nvmf_controller 	ctrlr;

	struct spdk_poller			*poller;

	TAILQ_HEAD(, spdk_nvmf_listen_addr)	listen_addrs;
	uint32_t				num_listen_addrs;

	TAILQ_HEAD(, spdk_nvmf_host)		hosts;
	uint32_t				num_hosts;

	TAILQ_ENTRY(spdk_nvmf_subsystem) entries;
};

struct spdk_nvmf_subsystem *
nvmf_create_subsystem(int num, const char *name,
		      enum spdk_nvmf_subtype subtype,
		      uint32_t lcore);

int
nvmf_delete_subsystem(struct spdk_nvmf_subsystem *subsystem);

struct spdk_nvmf_subsystem *
nvmf_find_subsystem(const char *subnqn, const char *hostnqn);

int
spdk_nvmf_subsystem_add_listener(struct spdk_nvmf_subsystem *subsystem,
				 const struct spdk_nvmf_transport *transport,
				 char *traddr, char *trsvcid);

int
spdk_nvmf_subsystem_add_host(struct spdk_nvmf_subsystem *subsystem,
			     char *host_nqn);

int
nvmf_subsystem_add_ctrlr(struct spdk_nvmf_subsystem *subsystem,
			 struct spdk_nvme_ctrlr *ctrlr);

int
spdk_shutdown_nvmf_subsystems(void);

void
spdk_format_discovery_log(struct spdk_nvmf_discovery_log_page *disc_log, uint32_t length);

void spdk_nvmf_subsystem_poll(struct spdk_nvmf_subsystem *subsystem);

int
spdk_nvmf_subsystem_add_ns(struct spdk_nvmf_subsystem *subsystem, struct spdk_bdev *bdev);
extern const struct spdk_nvmf_ctrlr_ops spdk_nvmf_direct_ctrlr_ops;
extern const struct spdk_nvmf_ctrlr_ops spdk_nvmf_virtual_ctrlr_ops;
#endif /* SPDK_NVMF_SUBSYSTEM_H */