/*-
 *   BSD LICENSE
 *
 *   Copyright (c) Intel Corporation. All rights reserved.
 *   Copyright (c) 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 <rdma/rdma_cma.h>

#include "spdk/stdinc.h"
#include "spdk/string.h"
#include "spdk/likely.h"

#include "spdk_internal/rdma.h"
#include "spdk/log.h"

struct spdk_rdma_qp *
spdk_rdma_qp_create(struct rdma_cm_id *cm_id, struct spdk_rdma_qp_init_attr *qp_attr)
{
	struct spdk_rdma_qp *spdk_rdma_qp;
	int rc;
	struct ibv_qp_init_attr attr = {
		.qp_context = qp_attr->qp_context,
		.send_cq = qp_attr->send_cq,
		.recv_cq = qp_attr->recv_cq,
		.srq = qp_attr->srq,
		.cap = qp_attr->cap,
		.qp_type = IBV_QPT_RC
	};

	spdk_rdma_qp = calloc(1, sizeof(*spdk_rdma_qp));
	if (!spdk_rdma_qp) {
		SPDK_ERRLOG("qp memory allocation failed\n");
		return NULL;
	}

	if (qp_attr->stats) {
		spdk_rdma_qp->stats = qp_attr->stats;
		spdk_rdma_qp->shared_stats = true;
	} else {
		spdk_rdma_qp->stats = calloc(1, sizeof(*spdk_rdma_qp->stats));
		if (!spdk_rdma_qp->stats) {
			SPDK_ERRLOG("qp statistics memory allocation failed\n");
			free(spdk_rdma_qp);
			return NULL;
		}
	}

	rc = rdma_create_qp(cm_id, qp_attr->pd, &attr);
	if (rc) {
		SPDK_ERRLOG("Failed to create qp, errno %s (%d)\n", spdk_strerror(errno), errno);
		free(spdk_rdma_qp);
		return NULL;
	}

	qp_attr->cap = attr.cap;
	spdk_rdma_qp->qp = cm_id->qp;
	spdk_rdma_qp->cm_id = cm_id;

	return spdk_rdma_qp;
}

int
spdk_rdma_qp_accept(struct spdk_rdma_qp *spdk_rdma_qp, struct rdma_conn_param *conn_param)
{
	assert(spdk_rdma_qp != NULL);
	assert(spdk_rdma_qp->cm_id != NULL);

	return rdma_accept(spdk_rdma_qp->cm_id, conn_param);
}

int
spdk_rdma_qp_complete_connect(struct spdk_rdma_qp *spdk_rdma_qp)
{
	/* Nothing to be done for Verbs */
	return 0;
}

void
spdk_rdma_qp_destroy(struct spdk_rdma_qp *spdk_rdma_qp)
{
	assert(spdk_rdma_qp != NULL);

	if (spdk_rdma_qp->send_wrs.first != NULL) {
		SPDK_WARNLOG("Destroying qpair with queued Work Requests\n");
	}

	if (spdk_rdma_qp->qp) {
		rdma_destroy_qp(spdk_rdma_qp->cm_id);
	}

	if (!spdk_rdma_qp->shared_stats) {
		free(spdk_rdma_qp->stats);
	}

	free(spdk_rdma_qp);
}

int
spdk_rdma_qp_disconnect(struct spdk_rdma_qp *spdk_rdma_qp)
{
	int rc = 0;

	assert(spdk_rdma_qp != NULL);

	if (spdk_rdma_qp->cm_id) {
		rc = rdma_disconnect(spdk_rdma_qp->cm_id);
		if (rc) {
			if (errno == EINVAL && spdk_rdma_qp->qp->context->device->transport_type == IBV_TRANSPORT_IWARP) {
				/* rdma_disconnect may return an error and set errno to EINVAL in case of iWARP.
				 * This behaviour is expected since iWARP handles disconnect event other than IB and
				 * qpair is already in error state when we call rdma_disconnect */
				return 0;
			}
			SPDK_ERRLOG("rdma_disconnect failed, errno %s (%d)\n", spdk_strerror(errno), errno);
		}
	}

	return rc;
}

bool
spdk_rdma_qp_queue_send_wrs(struct spdk_rdma_qp *spdk_rdma_qp, struct ibv_send_wr *first)
{
	struct ibv_send_wr *last;

	assert(spdk_rdma_qp);
	assert(first);

	spdk_rdma_qp->stats->send.num_submitted_wrs++;
	last = first;
	while (last->next != NULL) {
		last = last->next;
		spdk_rdma_qp->stats->send.num_submitted_wrs++;
	}

	if (spdk_rdma_qp->send_wrs.first == NULL) {
		spdk_rdma_qp->send_wrs.first = first;
		spdk_rdma_qp->send_wrs.last = last;
		return true;
	} else {
		spdk_rdma_qp->send_wrs.last->next = first;
		spdk_rdma_qp->send_wrs.last = last;
		return false;
	}
}

int
spdk_rdma_qp_flush_send_wrs(struct spdk_rdma_qp *spdk_rdma_qp, struct ibv_send_wr **bad_wr)
{
	int rc;

	assert(spdk_rdma_qp);
	assert(bad_wr);

	if (spdk_unlikely(!spdk_rdma_qp->send_wrs.first)) {
		return 0;
	}

	rc = ibv_post_send(spdk_rdma_qp->qp, spdk_rdma_qp->send_wrs.first, bad_wr);

	spdk_rdma_qp->send_wrs.first = NULL;
	spdk_rdma_qp->stats->send.doorbell_updates++;

	return rc;
}
