/*-
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 *
 *   Copyright (c) Intel Corporation.
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 *
 *     * 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.
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 *       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
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 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** \file
 * NVMe over Fabrics target public API
 */

#ifndef SPDK_NVMF_H
#define SPDK_NVMF_H

#include <stdint.h>

#include "spdk/env.h"
#include "spdk/nvmf_spec.h"
#include "spdk/queue.h"

#define MAX_VIRTUAL_NAMESPACE 16
#define MAX_SN_LEN 20

int spdk_nvmf_tgt_init(uint16_t max_queue_depth, uint16_t max_conn_per_sess,
		       uint32_t in_capsule_data_size, uint32_t max_io_size);

int spdk_nvmf_tgt_fini(void);

int spdk_nvmf_check_pools(void);

struct spdk_nvmf_subsystem;
struct spdk_nvmf_session;
struct spdk_nvmf_conn;
struct spdk_nvmf_request;
struct spdk_bdev;
struct spdk_nvme_ctrlr;
struct spdk_nvmf_request;
struct spdk_nvmf_conn;

typedef void (*spdk_nvmf_subsystem_connect_fn)(void *cb_ctx, struct spdk_nvmf_request *req);
typedef void (*spdk_nvmf_subsystem_disconnect_fn)(void *cb_ctx, struct spdk_nvmf_conn *conn);

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

struct spdk_nvmf_listen_addr {
	char					*traddr;
	char					*trsvcid;
	char					*trname;
	TAILQ_ENTRY(spdk_nvmf_listen_addr)	link;
};

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

struct spdk_nvmf_ctrlr_ops {
	/**
	 * Initialize the controller.
	 */
	int (*attach)(struct spdk_nvmf_subsystem *subsystem);

	/**
	 * Get NVMe identify controller data.
	 */
	void (*ctrlr_get_data)(struct spdk_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 spdk_nvmf_subsystem *subsystem);

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

struct spdk_nvmf_subsystem_allowed_listener {
	struct spdk_nvmf_listen_addr				*listen_addr;
	TAILQ_ENTRY(spdk_nvmf_subsystem_allowed_listener)	link;
};

/*
 * 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 {
	uint32_t id;
	uint32_t lcore;
	char subnqn[SPDK_NVMF_NQN_MAX_LEN];
	enum spdk_nvmf_subsystem_mode mode;
	enum spdk_nvmf_subtype subtype;
	bool is_removed;
	union {
		struct {
			struct spdk_nvme_ctrlr *ctrlr;
			struct spdk_nvme_qpair *io_qpair;
			struct spdk_pci_addr pci_addr;
		} direct;

		struct {
			char	sn[MAX_SN_LEN + 1];
			struct spdk_bdev *ns_list[MAX_VIRTUAL_NAMESPACE];
			struct spdk_io_channel *ch[MAX_VIRTUAL_NAMESPACE];
			uint16_t ns_count;
		} virt;
	} dev;

	const struct spdk_nvmf_ctrlr_ops *ops;

	void					*cb_ctx;
	spdk_nvmf_subsystem_connect_fn		connect_cb;
	spdk_nvmf_subsystem_disconnect_fn	disconnect_cb;

	TAILQ_HEAD(, spdk_nvmf_session)		sessions;

	TAILQ_HEAD(, spdk_nvmf_host)		hosts;
	uint32_t				num_hosts;

	TAILQ_HEAD(, spdk_nvmf_subsystem_allowed_listener)	allowed_listeners;

	TAILQ_ENTRY(spdk_nvmf_subsystem) entries;
};

struct spdk_nvmf_subsystem *spdk_nvmf_create_subsystem(const char *nqn,
		enum spdk_nvmf_subtype type,
		enum spdk_nvmf_subsystem_mode mode,
		void *cb_ctx,
		spdk_nvmf_subsystem_connect_fn connect_cb,
		spdk_nvmf_subsystem_disconnect_fn disconnect_cb);

/**
 * Initialize the subsystem on the thread that will be used to poll it.
 *
 * \param subsystem Subsystem that will be polled on this core.
 */
int spdk_nvmf_subsystem_start(struct spdk_nvmf_subsystem *subsystem);

void spdk_nvmf_delete_subsystem(struct spdk_nvmf_subsystem *subsystem);

struct spdk_nvmf_subsystem *
nvmf_find_subsystem(const char *subnqn);

bool spdk_nvmf_subsystem_exists(const char *subnqn);

bool spdk_nvmf_subsystem_host_allowed(struct spdk_nvmf_subsystem *subsystem, const char *hostnqn);

struct spdk_nvmf_listen_addr *
spdk_nvmf_tgt_listen(const char *trname, const char *traddr, const char *trsvcid);

int
spdk_nvmf_subsystem_add_listener(struct spdk_nvmf_subsystem *subsystem,
				 struct spdk_nvmf_listen_addr *listen_addr);

bool
spdk_nvmf_subsystem_listener_allowed(struct spdk_nvmf_subsystem *subsystem,
				     struct spdk_nvmf_listen_addr *listen_addr);

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

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

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);

int spdk_nvmf_subsystem_set_sn(struct spdk_nvmf_subsystem *subsystem, const char *sn);

const char *spdk_nvmf_subsystem_get_nqn(struct spdk_nvmf_subsystem *subsystem);
enum spdk_nvmf_subtype spdk_nvmf_subsystem_get_type(struct spdk_nvmf_subsystem *subsystem);
enum spdk_nvmf_subsystem_mode spdk_nvmf_subsystem_get_mode(struct spdk_nvmf_subsystem *subsystem);

void spdk_nvmf_acceptor_poll(void);

void spdk_nvmf_handle_connect(struct spdk_nvmf_request *req);

void
spdk_nvmf_session_disconnect(struct spdk_nvmf_conn *conn);

#endif