/*-
 *   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 __NVMF_INTERNAL_H__
#define __NVMF_INTERNAL_H__

#include "spdk/stdinc.h"

#include "spdk/likely.h"
#include "spdk/nvmf.h"
#include "spdk/nvmf_spec.h"
#include "spdk/assert.h"
#include "spdk/bdev.h"
#include "spdk/queue.h"
#include "spdk/util.h"
#include "spdk/thread.h"

#define SPDK_NVMF_MAX_SGL_ENTRIES	16

enum spdk_nvmf_subsystem_state {
	SPDK_NVMF_SUBSYSTEM_INACTIVE = 0,
	SPDK_NVMF_SUBSYSTEM_ACTIVATING,
	SPDK_NVMF_SUBSYSTEM_ACTIVE,
	SPDK_NVMF_SUBSYSTEM_PAUSING,
	SPDK_NVMF_SUBSYSTEM_PAUSED,
	SPDK_NVMF_SUBSYSTEM_RESUMING,
	SPDK_NVMF_SUBSYSTEM_DEACTIVATING,
};

enum spdk_nvmf_qpair_state {
	SPDK_NVMF_QPAIR_UNINITIALIZED = 0,
	SPDK_NVMF_QPAIR_INACTIVE,
	SPDK_NVMF_QPAIR_ACTIVATING,
	SPDK_NVMF_QPAIR_ACTIVE,
	SPDK_NVMF_QPAIR_DEACTIVATING,
	SPDK_NVMF_QPAIR_ERROR,
};

typedef void (*spdk_nvmf_state_change_done)(void *cb_arg, int status);

struct spdk_nvmf_tgt {
	struct spdk_nvmf_tgt_opts		opts;

	uint64_t				discovery_genctr;

	/* Array of subsystem pointers of size max_subsystems indexed by sid */
	struct spdk_nvmf_subsystem		**subsystems;

	struct spdk_nvmf_discovery_log_page	*discovery_log_page;
	size_t					discovery_log_page_size;
	TAILQ_HEAD(, spdk_nvmf_transport)	transports;

	spdk_nvmf_tgt_destroy_done_fn		*destroy_cb_fn;
	void					*destroy_cb_arg;
};

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

struct spdk_nvmf_listener {
	struct spdk_nvme_transport_id	trid;
	struct spdk_nvmf_transport	*transport;
	TAILQ_ENTRY(spdk_nvmf_listener)	link;
};

struct spdk_nvmf_transport_poll_group {
	struct spdk_nvmf_transport			*transport;
	TAILQ_ENTRY(spdk_nvmf_transport_poll_group)	link;
};

struct spdk_nvmf_subsystem_poll_group {
	/* Array of channels for each namespace indexed by nsid - 1 */
	struct spdk_io_channel	**channels;
	uint32_t		num_channels;

	enum spdk_nvmf_subsystem_state state;

	TAILQ_HEAD(, spdk_nvmf_request)	queued;
};

struct spdk_nvmf_poll_group {
	struct spdk_thread				*thread;
	struct spdk_poller				*poller;

	TAILQ_HEAD(, spdk_nvmf_transport_poll_group)	tgroups;

	/* Array of poll groups indexed by subsystem id (sid) */
	struct spdk_nvmf_subsystem_poll_group		*sgroups;
	uint32_t					num_sgroups;

	/* All of the queue pairs that belong to this poll group */
	TAILQ_HEAD(, spdk_nvmf_qpair)			qpairs;
};

typedef enum _spdk_nvmf_request_exec_status {
	SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE,
	SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS,
} spdk_nvmf_request_exec_status;

union nvmf_h2c_msg {
	struct spdk_nvmf_capsule_cmd			nvmf_cmd;
	struct spdk_nvme_cmd				nvme_cmd;
	struct spdk_nvmf_fabric_prop_set_cmd		prop_set_cmd;
	struct spdk_nvmf_fabric_prop_get_cmd		prop_get_cmd;
	struct spdk_nvmf_fabric_connect_cmd		connect_cmd;
};
SPDK_STATIC_ASSERT(sizeof(union nvmf_h2c_msg) == 64, "Incorrect size");

union nvmf_c2h_msg {
	struct spdk_nvme_cpl				nvme_cpl;
	struct spdk_nvmf_fabric_prop_get_rsp		prop_get_rsp;
	struct spdk_nvmf_fabric_connect_rsp		connect_rsp;
};
SPDK_STATIC_ASSERT(sizeof(union nvmf_c2h_msg) == 16, "Incorrect size");

struct spdk_nvmf_request {
	struct spdk_nvmf_qpair		*qpair;
	uint32_t			length;
	enum spdk_nvme_data_transfer	xfer;
	void				*data;
	union nvmf_h2c_msg		*cmd;
	union nvmf_c2h_msg		*rsp;
	struct iovec			iov[SPDK_NVMF_MAX_SGL_ENTRIES];
	uint32_t			iovcnt;
	struct spdk_bdev_io_wait_entry	bdev_io_wait;

	TAILQ_ENTRY(spdk_nvmf_request)	link;
};

struct spdk_nvmf_ns {
	struct spdk_nvmf_subsystem *subsystem;
	struct spdk_bdev *bdev;
	struct spdk_bdev_desc *desc;
	struct spdk_nvmf_ns_opts opts;
};

struct spdk_nvmf_qpair {
	enum spdk_nvmf_qpair_state		state;
	spdk_nvmf_state_change_done		state_cb;
	void					*state_cb_arg;

	struct spdk_nvmf_transport		*transport;
	struct spdk_nvmf_ctrlr			*ctrlr;
	struct spdk_nvmf_poll_group		*group;

	uint16_t				qid;
	uint16_t				sq_head;
	uint16_t				sq_head_max;

	TAILQ_HEAD(, spdk_nvmf_request)		outstanding;
	TAILQ_ENTRY(spdk_nvmf_qpair)		link;
};

struct spdk_nvmf_ctrlr_feat {
	union spdk_nvme_feat_arbitration arbitration;
	union spdk_nvme_feat_power_management power_management;
	union spdk_nvme_feat_error_recovery error_recovery;
	union spdk_nvme_feat_volatile_write_cache volatile_write_cache;
	union spdk_nvme_feat_number_of_queues number_of_queues;
	union spdk_nvme_feat_write_atomicity write_atomicity;
	union spdk_nvme_feat_async_event_configuration async_event_configuration;
	union spdk_nvme_feat_keep_alive_timer keep_alive_timer;
};

/*
 * This structure represents an NVMe-oF controller,
 * which is like a "session" in networking terms.
 */
struct spdk_nvmf_ctrlr {
	uint16_t			cntlid;
	struct spdk_nvmf_subsystem	*subsys;

	struct {
		union spdk_nvme_cap_register	cap;
		union spdk_nvme_vs_register	vs;
		union spdk_nvme_cc_register	cc;
		union spdk_nvme_csts_register	csts;
	} vcprop; /* virtual controller properties */

	struct spdk_nvmf_ctrlr_feat feat;

	struct spdk_nvmf_qpair	*admin_qpair;
	struct spdk_thread	*thread;
	struct spdk_bit_array	*qpair_mask;

	struct spdk_nvmf_request *aer_req;
	union spdk_nvme_async_event_completion notice_event;
	uint8_t hostid[16];

	uint16_t changed_ns_list_count;
	struct spdk_nvme_ns_list changed_ns_list;

	TAILQ_ENTRY(spdk_nvmf_ctrlr)		link;
};

struct spdk_nvmf_subsystem {
	struct spdk_thread		*thread;
	uint32_t			id;
	enum spdk_nvmf_subsystem_state	state;

	char subnqn[SPDK_NVMF_NQN_MAX_LEN + 1];
	enum spdk_nvmf_subtype subtype;
	uint16_t next_cntlid;
	bool allow_any_host;

	struct spdk_nvmf_tgt			*tgt;

	char sn[SPDK_NVME_CTRLR_SN_LEN + 1];

	/* Array of pointers to namespaces of size max_nsid indexed by nsid - 1 */
	struct spdk_nvmf_ns			**ns;
	uint32_t				max_nsid;
	/* This is the maximum allowed nsid to a subsystem */
	uint32_t				max_allowed_nsid;

	TAILQ_HEAD(, spdk_nvmf_ctrlr)		ctrlrs;

	TAILQ_HEAD(, spdk_nvmf_host)		hosts;

	TAILQ_HEAD(, spdk_nvmf_listener)	listeners;

	TAILQ_ENTRY(spdk_nvmf_subsystem)	entries;
};

typedef void(*spdk_nvmf_poll_group_mod_done)(void *cb_arg, int status);

struct spdk_nvmf_transport *spdk_nvmf_tgt_get_transport(struct spdk_nvmf_tgt *tgt,
		enum spdk_nvme_transport_type);

int spdk_nvmf_poll_group_add_transport(struct spdk_nvmf_poll_group *group,
				       struct spdk_nvmf_transport *transport);
int spdk_nvmf_poll_group_update_subsystem(struct spdk_nvmf_poll_group *group,
		struct spdk_nvmf_subsystem *subsystem);
int spdk_nvmf_poll_group_add_subsystem(struct spdk_nvmf_poll_group *group,
				       struct spdk_nvmf_subsystem *subsystem,
				       spdk_nvmf_poll_group_mod_done cb_fn, void *cb_arg);
void spdk_nvmf_poll_group_remove_subsystem(struct spdk_nvmf_poll_group *group,
		struct spdk_nvmf_subsystem *subsystem, spdk_nvmf_poll_group_mod_done cb_fn, void *cb_arg);
void spdk_nvmf_poll_group_pause_subsystem(struct spdk_nvmf_poll_group *group,
		struct spdk_nvmf_subsystem *subsystem, spdk_nvmf_poll_group_mod_done cb_fn, void *cb_arg);
void spdk_nvmf_poll_group_resume_subsystem(struct spdk_nvmf_poll_group *group,
		struct spdk_nvmf_subsystem *subsystem, spdk_nvmf_poll_group_mod_done cb_fn, void *cb_arg);
void spdk_nvmf_request_exec(struct spdk_nvmf_request *req);
int spdk_nvmf_request_free(struct spdk_nvmf_request *req);
int spdk_nvmf_request_complete(struct spdk_nvmf_request *req);

void spdk_nvmf_get_discovery_log_page(struct spdk_nvmf_tgt *tgt,
				      void *buffer, uint64_t offset,
				      uint32_t length);

void spdk_nvmf_ctrlr_destruct(struct spdk_nvmf_ctrlr *ctrlr);
int spdk_nvmf_ctrlr_process_fabrics_cmd(struct spdk_nvmf_request *req);
int spdk_nvmf_ctrlr_process_admin_cmd(struct spdk_nvmf_request *req);
int spdk_nvmf_ctrlr_process_io_cmd(struct spdk_nvmf_request *req);
bool spdk_nvmf_ctrlr_dsm_supported(struct spdk_nvmf_ctrlr *ctrlr);
bool spdk_nvmf_ctrlr_write_zeroes_supported(struct spdk_nvmf_ctrlr *ctrlr);
void spdk_nvmf_ctrlr_ns_changed(struct spdk_nvmf_ctrlr *ctrlr, uint32_t nsid);

void spdk_nvmf_bdev_ctrlr_identify_ns(struct spdk_nvmf_ns *ns, struct spdk_nvme_ns_data *nsdata);

int spdk_nvmf_subsystem_add_ctrlr(struct spdk_nvmf_subsystem *subsystem,
				  struct spdk_nvmf_ctrlr *ctrlr);
void spdk_nvmf_subsystem_remove_ctrlr(struct spdk_nvmf_subsystem *subsystem,
				      struct spdk_nvmf_ctrlr *ctrlr);
struct spdk_nvmf_ctrlr *spdk_nvmf_subsystem_get_ctrlr(struct spdk_nvmf_subsystem *subsystem,
		uint16_t cntlid);
int spdk_nvmf_ctrlr_async_event_ns_notice(struct spdk_nvmf_ctrlr *ctrlr);

/*
 * Abort aer is sent on a per controller basis and sends a completion for the aer to the host.
 * This function should be called when attempting to recover in error paths when it is OK for
 * the host to send a subsequent AER.
 */
void spdk_nvmf_ctrlr_abort_aer(struct spdk_nvmf_ctrlr *ctrlr);

/*
 * Free aer simply frees the rdma resources for the aer without informing the host.
 * This function should be called when deleting a qpair when one wants to make sure
 * the qpair is completely empty before freeing the request. The reason we free the
 * AER without sending a completion is to prevent the host from sending another AER.
 */
void spdk_nvmf_qpair_free_aer(struct spdk_nvmf_qpair *qpair);

static inline struct spdk_nvmf_ns *
_spdk_nvmf_subsystem_get_ns(struct spdk_nvmf_subsystem *subsystem, uint32_t nsid)
{
	/* NOTE: This implicitly also checks for 0, since 0 - 1 wraps around to UINT32_MAX. */
	if (spdk_unlikely(nsid - 1 >= subsystem->max_nsid)) {
		return NULL;
	}

	return subsystem->ns[nsid - 1];
}

static inline bool
spdk_nvmf_qpair_is_admin_queue(struct spdk_nvmf_qpair *qpair)
{
	return qpair->qid == 0;
}

#endif /* __NVMF_INTERNAL_H__ */