Spdk/lib/nvme/nvme_poll_group.c

/*-
 *   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.
 */


#include "nvme_internal.h"

struct spdk_nvme_poll_group *
spdk_nvme_poll_group_create(void *ctx)
{
	struct spdk_nvme_poll_group *group;

	group = calloc(1, sizeof(*group));
	if (group == NULL) {
		return NULL;
	}

	group->ctx = ctx;
	STAILQ_INIT(&group->tgroups);

	return group;
}

int
spdk_nvme_poll_group_add(struct spdk_nvme_poll_group *group, struct spdk_nvme_qpair *qpair)
{
	struct spdk_nvme_transport_poll_group *tgroup;
	const struct spdk_nvme_transport *transport;

	if (nvme_qpair_get_state(qpair) != NVME_QPAIR_DISCONNECTED) {
		return -EINVAL;
	}

	STAILQ_FOREACH(tgroup, &group->tgroups, link) {
		if (tgroup->transport == qpair->transport) {
			break;
		}
	}

	/* See if a new transport has been added (dlopen style) and we need to update the poll group */
	if (!tgroup) {
		transport = nvme_get_first_transport();
		while (transport != NULL) {
			if (transport == qpair->transport) {
				tgroup = nvme_transport_poll_group_create(transport);
				if (tgroup == NULL) {
					return -ENOMEM;
				}
				tgroup->group = group;
				STAILQ_INSERT_TAIL(&group->tgroups, tgroup, link);
				break;
			}
			transport = nvme_get_next_transport(transport);
		}
	}

	return tgroup ? nvme_transport_poll_group_add(tgroup, qpair) : -ENODEV;
}

int
spdk_nvme_poll_group_remove(struct spdk_nvme_poll_group *group, struct spdk_nvme_qpair *qpair)
{
	struct spdk_nvme_transport_poll_group *tgroup;

	STAILQ_FOREACH(tgroup, &group->tgroups, link) {
		if (tgroup->transport == qpair->transport) {
			return nvme_transport_poll_group_remove(tgroup, qpair);
		}
	}

	return -ENODEV;
}

int
nvme_poll_group_connect_qpair(struct spdk_nvme_qpair *qpair)
{
	return nvme_transport_poll_group_connect_qpair(qpair);
}

int
nvme_poll_group_disconnect_qpair(struct spdk_nvme_qpair *qpair)
{
	return nvme_transport_poll_group_disconnect_qpair(qpair);
}

int64_t
spdk_nvme_poll_group_process_completions(struct spdk_nvme_poll_group *group,
		uint32_t completions_per_qpair, spdk_nvme_disconnected_qpair_cb disconnected_qpair_cb)
{
	struct spdk_nvme_transport_poll_group *tgroup;
	int64_t local_completions = 0, error_reason = 0, num_completions = 0;

	if (disconnected_qpair_cb == NULL) {
		return -EINVAL;
	}

	STAILQ_FOREACH(tgroup, &group->tgroups, link) {
		local_completions = nvme_transport_poll_group_process_completions(tgroup, completions_per_qpair,
				    disconnected_qpair_cb);
		if (local_completions < 0 && error_reason == 0) {
			error_reason = local_completions;
		} else {
			num_completions += local_completions;
			/* Just to be safe */
			assert(num_completions >= 0);
		}
	}

	return error_reason ? error_reason : num_completions;
}

void *
spdk_nvme_poll_group_get_ctx(struct spdk_nvme_poll_group *group)
{
	return group->ctx;
}

int
spdk_nvme_poll_group_destroy(struct spdk_nvme_poll_group *group)
{
	struct spdk_nvme_transport_poll_group *tgroup, *tmp_tgroup;

	STAILQ_FOREACH_SAFE(tgroup, &group->tgroups, link, tmp_tgroup) {
		STAILQ_REMOVE(&group->tgroups, tgroup, spdk_nvme_transport_poll_group, link);
		if (nvme_transport_poll_group_destroy(tgroup) != 0) {
			STAILQ_INSERT_TAIL(&group->tgroups, tgroup, link);
			return -EBUSY;
		}

	}

	free(group);

	return 0;
}