/*-
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 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
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/** \file
 * NVMe over Fabrics target public API
 */

#ifndef SPDK_NVMF_H
#define SPDK_NVMF_H

#include "spdk/stdinc.h"

#include "spdk/env.h"
#include "spdk/nvme.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_qpair_per_ctrlr,
		       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_ctrlr;
struct spdk_nvmf_qpair;
struct spdk_nvmf_request;
struct spdk_bdev;
struct spdk_nvmf_request;
struct spdk_nvmf_ctrlr_ops;

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_qpair *qpair);

struct spdk_nvmf_listen_addr {
	struct spdk_nvme_transport_id		trid;
	TAILQ_ENTRY(spdk_nvmf_listen_addr)	link;
};

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

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 controllers.  Any individual controller has
 * access to all the NVMe device/namespaces maintained by the subsystem.
 */
struct spdk_nvmf_subsystem {
	uint32_t id;
	char subnqn[SPDK_NVMF_NQN_MAX_LEN + 1];
	enum spdk_nvmf_subtype subtype;
	bool is_removed;

	struct {
		char sn[MAX_SN_LEN + 1];
		struct spdk_bdev *ns_list[MAX_VIRTUAL_NAMESPACE];
		struct spdk_bdev_desc *desc[MAX_VIRTUAL_NAMESPACE];
		struct spdk_io_channel *ch[MAX_VIRTUAL_NAMESPACE];
		uint32_t max_nsid;
	} 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_ctrlr)		ctrlrs;

	TAILQ_HEAD(, spdk_nvmf_host)		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,
		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 *spdk_nvmf_find_subsystem(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(struct spdk_nvme_transport_id *trid);

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);

void spdk_nvmf_subsystem_poll(struct spdk_nvmf_subsystem *subsystem);

/**
 * Add a namespace to a subsytem.
 *
 * \param subsystem Subsystem to add namespace to.
 * \param bdev Block device to add as a namespace.
 * \param nsid Namespace ID to assign to the new namespace, or 0 to automatically use an available
 *             NSID.
 *
 * \return Newly added NSID on success or 0 on failure.
 */
uint32_t spdk_nvmf_subsystem_add_ns(struct spdk_nvmf_subsystem *subsystem, struct spdk_bdev *bdev,
				    uint32_t nsid);

const char *spdk_nvmf_subsystem_get_sn(const struct spdk_nvmf_subsystem *subsystem);

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);

void spdk_nvmf_tgt_poll(void);

void spdk_nvmf_handle_connect(struct spdk_nvmf_request *req);

void spdk_nvmf_ctrlr_disconnect(struct spdk_nvmf_qpair *qpair);

#endif