/*-
 *   BSD LICENSE
 *
 *   Copyright (c) Intel Corporation. All rights reserved.
 *   Copyright (c) 2018 Mellanox Technologies LTD. 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.
 */

#include "spdk/stdinc.h"

#include "nvmf_internal.h"
#include "transport.h"

#include "spdk/config.h"
#include "spdk/log.h"
#include "spdk/nvmf.h"
#include "spdk/queue.h"
#include "spdk/util.h"

static const struct spdk_nvmf_transport_ops *const g_transport_ops[] = {
#ifdef SPDK_CONFIG_RDMA
	&spdk_nvmf_transport_rdma,
#endif
	&spdk_nvmf_transport_tcp,
};

#define NUM_TRANSPORTS (SPDK_COUNTOF(g_transport_ops))
#define MAX_MEMPOOL_NAME_LENGTH 40

static inline const struct spdk_nvmf_transport_ops *
spdk_nvmf_get_transport_ops(enum spdk_nvme_transport_type type)
{
	size_t i;
	for (i = 0; i != NUM_TRANSPORTS; i++) {
		if (g_transport_ops[i]->type == type) {
			return g_transport_ops[i];
		}
	}
	return NULL;
}

const struct spdk_nvmf_transport_opts *
spdk_nvmf_get_transport_opts(struct spdk_nvmf_transport *transport)
{
	return &transport->opts;
}

spdk_nvme_transport_type_t
spdk_nvmf_get_transport_type(struct spdk_nvmf_transport *transport)
{
	return transport->ops->type;
}

struct spdk_nvmf_transport *
spdk_nvmf_transport_create(enum spdk_nvme_transport_type type,
			   struct spdk_nvmf_transport_opts *opts)
{
	const struct spdk_nvmf_transport_ops *ops = NULL;
	struct spdk_nvmf_transport *transport;
	char spdk_mempool_name[MAX_MEMPOOL_NAME_LENGTH];
	int chars_written;

	if ((opts->max_io_size % opts->io_unit_size != 0) ||
	    (opts->max_io_size / opts->io_unit_size >
	     SPDK_NVMF_MAX_SGL_ENTRIES)) {
		SPDK_ERRLOG("%s: invalid IO size, MaxIO:%d, UnitIO:%d, MaxSGL:%d\n",
			    spdk_nvme_transport_id_trtype_str(type),
			    opts->max_io_size,
			    opts->io_unit_size,
			    SPDK_NVMF_MAX_SGL_ENTRIES);
		return NULL;
	}

	ops = spdk_nvmf_get_transport_ops(type);
	if (!ops) {
		SPDK_ERRLOG("Transport type %s unavailable.\n",
			    spdk_nvme_transport_id_trtype_str(type));
		return NULL;
	}

	transport = ops->create(opts);
	if (!transport) {
		SPDK_ERRLOG("Unable to create new transport of type %s\n",
			    spdk_nvme_transport_id_trtype_str(type));
		return NULL;
	}

	transport->ops = ops;
	transport->opts = *opts;
	chars_written = snprintf(spdk_mempool_name, MAX_MEMPOOL_NAME_LENGTH, "%s_%s_%s", "spdk_nvmf",
				 spdk_nvme_transport_id_trtype_str(type), "data");
	if (chars_written < 0) {
		SPDK_ERRLOG("Unable to generate transport data buffer pool name.\n");
		ops->destroy(transport);
		return NULL;
	}

	transport->data_buf_pool = spdk_mempool_create(spdk_mempool_name,
				   opts->num_shared_buffers,
				   opts->io_unit_size + NVMF_DATA_BUFFER_ALIGNMENT,
				   SPDK_MEMPOOL_DEFAULT_CACHE_SIZE,
				   SPDK_ENV_SOCKET_ID_ANY);

	if (!transport->data_buf_pool) {
		SPDK_ERRLOG("Unable to allocate buffer pool for poll group\n");
		ops->destroy(transport);
		return NULL;
	}

	return transport;
}

struct spdk_nvmf_transport *
spdk_nvmf_transport_get_first(struct spdk_nvmf_tgt *tgt)
{
	return TAILQ_FIRST(&tgt->transports);
}

struct spdk_nvmf_transport *
spdk_nvmf_transport_get_next(struct spdk_nvmf_transport *transport)
{
	return TAILQ_NEXT(transport, link);
}

int
spdk_nvmf_transport_destroy(struct spdk_nvmf_transport *transport)
{
	if (transport->data_buf_pool != NULL) {
		if (spdk_mempool_count(transport->data_buf_pool) !=
		    transport->opts.num_shared_buffers) {
			SPDK_ERRLOG("transport buffer pool count is %zu but should be %u\n",
				    spdk_mempool_count(transport->data_buf_pool),
				    transport->opts.num_shared_buffers);
		}
	}

	spdk_mempool_free(transport->data_buf_pool);

	return transport->ops->destroy(transport);
}

int
spdk_nvmf_transport_listen(struct spdk_nvmf_transport *transport,
			   const struct spdk_nvme_transport_id *trid)
{
	return transport->ops->listen(transport, trid);
}

int
spdk_nvmf_transport_stop_listen(struct spdk_nvmf_transport *transport,
				const struct spdk_nvme_transport_id *trid)
{
	return transport->ops->stop_listen(transport, trid);
}

void
spdk_nvmf_transport_accept(struct spdk_nvmf_transport *transport, new_qpair_fn cb_fn)
{
	transport->ops->accept(transport, cb_fn);
}

void
spdk_nvmf_transport_listener_discover(struct spdk_nvmf_transport *transport,
				      struct spdk_nvme_transport_id *trid,
				      struct spdk_nvmf_discovery_log_page_entry *entry)
{
	transport->ops->listener_discover(transport, trid, entry);
}

struct spdk_nvmf_transport_poll_group *
spdk_nvmf_transport_poll_group_create(struct spdk_nvmf_transport *transport)
{
	struct spdk_nvmf_transport_poll_group *group;
	struct spdk_nvmf_transport_pg_cache_buf *buf;

	group = transport->ops->poll_group_create(transport);
	if (!group) {
		return NULL;
	}
	group->transport = transport;

	STAILQ_INIT(&group->buf_cache);

	if (transport->opts.buf_cache_size) {
		group->buf_cache_count = 0;
		group->buf_cache_size = transport->opts.buf_cache_size;
		while (group->buf_cache_count < group->buf_cache_size) {
			buf = (struct spdk_nvmf_transport_pg_cache_buf *)spdk_mempool_get(transport->data_buf_pool);
			if (!buf) {
				SPDK_NOTICELOG("Unable to reserve the full number of buffers for the pg buffer cache.\n");
				break;
			}
			STAILQ_INSERT_HEAD(&group->buf_cache, buf, link);
			group->buf_cache_count++;
		}
	}
	return group;
}

void
spdk_nvmf_transport_poll_group_destroy(struct spdk_nvmf_transport_poll_group *group)
{
	struct spdk_nvmf_transport_pg_cache_buf *buf, *tmp;

	STAILQ_FOREACH_SAFE(buf, &group->buf_cache, link, tmp) {
		STAILQ_REMOVE(&group->buf_cache, buf, spdk_nvmf_transport_pg_cache_buf, link);
		spdk_mempool_put(group->transport->data_buf_pool, buf);
	}
	group->transport->ops->poll_group_destroy(group);
}

int
spdk_nvmf_transport_poll_group_add(struct spdk_nvmf_transport_poll_group *group,
				   struct spdk_nvmf_qpair *qpair)
{
	if (qpair->transport) {
		assert(qpair->transport == group->transport);
		if (qpair->transport != group->transport) {
			return -1;
		}
	} else {
		qpair->transport = group->transport;
	}

	return group->transport->ops->poll_group_add(group, qpair);
}

int
spdk_nvmf_transport_poll_group_remove(struct spdk_nvmf_transport_poll_group *group,
				      struct spdk_nvmf_qpair *qpair)
{
	int rc = ENOTSUP;

	assert(qpair->transport == group->transport);
	if (group->transport->ops->poll_group_remove) {
		rc = group->transport->ops->poll_group_remove(group, qpair);
	}

	return rc;
}

int
spdk_nvmf_transport_poll_group_poll(struct spdk_nvmf_transport_poll_group *group)
{
	return group->transport->ops->poll_group_poll(group);
}

int
spdk_nvmf_transport_req_free(struct spdk_nvmf_request *req)
{
	return req->qpair->transport->ops->req_free(req);
}

int
spdk_nvmf_transport_req_complete(struct spdk_nvmf_request *req)
{
	return req->qpair->transport->ops->req_complete(req);
}

void
spdk_nvmf_transport_qpair_fini(struct spdk_nvmf_qpair *qpair)
{
	qpair->transport->ops->qpair_fini(qpair);
}

bool
spdk_nvmf_transport_qpair_is_idle(struct spdk_nvmf_qpair *qpair)
{
	return qpair->transport->ops->qpair_is_idle(qpair);
}

int
spdk_nvmf_transport_qpair_get_peer_trid(struct spdk_nvmf_qpair *qpair,
					struct spdk_nvme_transport_id *trid)
{
	return qpair->transport->ops->qpair_get_peer_trid(qpair, trid);
}

int
spdk_nvmf_transport_qpair_get_local_trid(struct spdk_nvmf_qpair *qpair,
		struct spdk_nvme_transport_id *trid)
{
	return qpair->transport->ops->qpair_get_local_trid(qpair, trid);
}

int
spdk_nvmf_transport_qpair_get_listen_trid(struct spdk_nvmf_qpair *qpair,
		struct spdk_nvme_transport_id *trid)
{
	return qpair->transport->ops->qpair_get_listen_trid(qpair, trid);
}

bool
spdk_nvmf_transport_opts_init(enum spdk_nvme_transport_type type,
			      struct spdk_nvmf_transport_opts *opts)
{
	const struct spdk_nvmf_transport_ops *ops;

	ops = spdk_nvmf_get_transport_ops(type);
	if (!ops) {
		SPDK_ERRLOG("Transport type %s unavailable.\n",
			    spdk_nvme_transport_id_trtype_str(type));
		return false;
	}

	ops->opts_init(opts);
	return true;
}

int
spdk_nvmf_transport_qpair_set_sqsize(struct spdk_nvmf_qpair *qpair)
{
	if (qpair->transport->ops->qpair_set_sqsize) {
		return qpair->transport->ops->qpair_set_sqsize(qpair);
	}

	return 0;
}