/*-
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 *
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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"

struct spdk_nvmf_tgt;

struct spdk_nvmf_tgt_opts {
	uint16_t max_queue_depth;
	uint16_t max_qpairs_per_ctrlr;
	uint32_t in_capsule_data_size;
	uint32_t max_io_size;
};

void spdk_nvmf_tgt_opts_init(struct spdk_nvmf_tgt_opts *opts);

/**
 * Construct an NVMe-oF target
 *
 * \param opts Options
 * \return An spdk_nvmf_tgt on success, NULL on failure.
 */
struct spdk_nvmf_tgt *spdk_nvmf_tgt_create(struct spdk_nvmf_tgt_opts *opts);

/**
 * Destroy an NVMe-oF target
 *
 * \param tgt The target to destroy. This releases all resources.
 */
void spdk_nvmf_tgt_destroy(struct spdk_nvmf_tgt *tgt);

/**
 * Begin accepting new connections at the address provided.
 *
 * The connections will be matched with a subsystem, which may or may not allow
 * the connection based on a subsystem-specific whitelist. See
 * spdk_nvmf_subsystem_add_host() and spdk_nvmf_subsystem_add_listener()
 *
 * \param tgt The target associated with this listen address
 * \param trid The address to listen at
 *
 * \return 0 on success. Negated errno on failure.
 */
int spdk_nvmf_tgt_listen(struct spdk_nvmf_tgt *tgt,
			 struct spdk_nvme_transport_id *trid);

/**
 * Poll the target for incoming connections.
 */
void spdk_nvmf_tgt_accept(struct spdk_nvmf_tgt *tgt);

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_host;
struct spdk_nvmf_listener;

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);

/*
 * 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 *spdk_nvmf_create_subsystem(struct spdk_nvmf_tgt *tgt,
		const char *nqn,
		enum spdk_nvmf_subtype type,
		uint32_t num_ns,
		void *cb_ctx,
		spdk_nvmf_subsystem_connect_fn connect_cb,
		spdk_nvmf_subsystem_disconnect_fn disconnect_cb);

/**
 * Search the target for a subsystem with the given NQN
 */
struct spdk_nvmf_subsystem *spdk_nvmf_tgt_find_subsystem(struct spdk_nvmf_tgt *tgt,
		const char *subnqn);

/**
 * 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);

/**
 * Allow the given host NQN to connect to the given subsystem.
 *
 * \param subsystem Subsystem to add host to
 * \param host_nqn The NQN for the host
 * \return 0 on success. Negated errno value on failure.
 */
int spdk_nvmf_subsystem_add_host(struct spdk_nvmf_subsystem *subsystem,
				 const char *hostnqn);

/**
 * Check if the given host is allowed to connect to the subsystem.
 *
 * \param subsystem The subsystem to query
 * \param hostnqn The NQN of the host
 * \return true if allowed, false if not.
 */
bool spdk_nvmf_subsystem_host_allowed(struct spdk_nvmf_subsystem *subsystem, const char *hostnqn);

/**
 * Return the first allowed host in a subsystem.
 *
 * \param subsystem Subsystem to query.
 * \return First allowed host in this subsystem, or NULL if none allowed.
 */
struct spdk_nvmf_host *spdk_nvmf_subsystem_get_first_host(struct spdk_nvmf_subsystem *subsystem);

/**
 * Return the next allowed host in a subsystem.
 *
 * \param subsystem Subsystem to query.
 * \param prev_host Previous host returned from this function.
 * \return Next allowed host in this subsystem, or NULL if prev_host was the last host.
 */
struct spdk_nvmf_host *spdk_nvmf_subsystem_get_next_host(struct spdk_nvmf_subsystem *subsystem,
		struct spdk_nvmf_host *prev_host);

/**
 * Get a host's NQN
 *
 * \param host Host to query.
 * \return NQN of host.
 */
const char *spdk_nvmf_host_get_nqn(struct spdk_nvmf_host *host);

/**
 * Accept new connections on the address provided
 *
 * \param subsystem Subsystem to add listener to
 * \param trid The address to accept connections from
 * \return 0 on success. Negated errno value on failure.
 */
int spdk_nvmf_subsystem_add_listener(struct spdk_nvmf_subsystem *subsystem,
				     struct spdk_nvme_transport_id *trid);

/**
 * Check if connections originated from the given address are allowed to connect to the subsystem.
 *
 * \param subsystem The subsystem to query
 * \param trid The listen address
 * \return true if allowed, false if not.
 */
bool spdk_nvmf_subsystem_listener_allowed(struct spdk_nvmf_subsystem *subsystem,
		struct spdk_nvme_transport_id *trid);

/**
 * Return the first allowed listen address in the subsystem.
 *
 * \param subsystem Subsystem to query.
 * \return First allowed listen address in this subsystem, or NULL if none allowed.
 */
struct spdk_nvmf_listener *spdk_nvmf_subsystem_get_first_listener(
	struct spdk_nvmf_subsystem *subsystem);

/**
 * Return the next allowed listen address in a subsystem.
 *
 * \param subsystem Subsystem to query.
 * \param prev_listener Previous listen address for this subsystem
 * \return Next allowed listen address in this subsystem, or NULL if prev_listener was the last address.
 */
struct spdk_nvmf_listener *spdk_nvmf_subsystem_get_next_listener(
	struct spdk_nvmf_subsystem *subsystem,
	struct spdk_nvmf_listener *prev_listener);

/**
 * Get a listen address' transport ID
 *
 * \param listener This listener
 * \return The transport ID for this listener
 */
const struct spdk_nvme_transport_id *spdk_nvmf_listener_get_trid(
	struct spdk_nvmf_listener *listener);


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);

/**
 * Return the first allocated namespace in a subsystem.
 *
 * \param subsystem Subsystem to query.
 * \return First allocated namespace in this subsystem, or NULL if this subsystem has no namespaces.
 */
struct spdk_nvmf_ns *spdk_nvmf_subsystem_get_first_ns(struct spdk_nvmf_subsystem *subsystem);

/**
 * Return the next allocated namespace in a subsystem.
 *
 * \param subsystem Subsystem to query.
 * \param prev_ns Previous ns returned from this function.
 * \return Next allocated namespace in this subsystem, or NULL if prev_ns was the last namespace.
 */
struct spdk_nvmf_ns *spdk_nvmf_subsystem_get_next_ns(struct spdk_nvmf_subsystem *subsystem,
		struct spdk_nvmf_ns *prev_ns);

/**
 * Get a namespace in a subsystem by NSID.
 *
 * \param subsystem Subsystem to search.
 * \param nsid Namespace ID to find.
 * \return Namespace matching nsid, or NULL if nsid was not found.
 */
struct spdk_nvmf_ns *spdk_nvmf_subsystem_get_ns(struct spdk_nvmf_subsystem *subsystem,
		uint32_t nsid);

/**
 * Get a namespace's NSID.
 *
 * \param ns Namespace to query.
 * \return NSID of ns.
 */
uint32_t spdk_nvmf_ns_get_id(const struct spdk_nvmf_ns *ns);

/**
 * Get a namespace's associated bdev.
 *
 * \param ns Namespace to query
 * \return Backing bdev of ns.
 */
struct spdk_bdev *spdk_nvmf_ns_get_bdev(struct spdk_nvmf_ns *ns);

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_handle_connect(struct spdk_nvmf_request *req);

void spdk_nvmf_ctrlr_disconnect(struct spdk_nvmf_qpair *qpair);

#endif