/*-
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 *
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 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
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 *       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
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 */

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

#ifndef SPDK_NVMF_H
#define SPDK_NVMF_H

#include <stdint.h>

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

#define MAX_VIRTUAL_NAMESPACE 16
#define MAX_SN_LEN 20

#define nvmf_min(a,b) (((a)<(b))?(a):(b))
#define nvmf_max(a,b) (((a)>(b))?(a):(b))

int 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 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_transport;
struct spdk_nvmf_request;
struct spdk_nvmf_conn;
struct spdk_pci_device;

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;
	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 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_session *session);

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

/*
 * 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;

	union {
		struct {
			struct spdk_nvme_ctrlr *ctrlr;
			struct spdk_nvme_qpair *io_qpair;
			struct spdk_pci_device *pci_dev;
		} 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;
	uint32_t				session_id;

	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 *spdk_nvmf_create_subsystem(int num,
		const char *name,
		enum spdk_nvmf_subtype subtype,
		enum spdk_nvmf_subsystem_mode mode,
		void *cb_ctx,
		spdk_nvmf_subsystem_connect_fn connect_cb,
		spdk_nvmf_subsystem_disconnect_fn disconnect_cb);

void spdk_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, struct spdk_pci_device *dev);

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 struct spdk_nvmf_transport *spdk_nvmf_transport_get(const char *name);
const char *spdk_nvmf_transport_get_name(const struct spdk_nvmf_transport *transport);

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