Spdk/lib/nvmf/subsystem.c

/*-
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 *
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 *   modification, are permitted provided that the following conditions
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 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
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 *       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
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 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *   (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 <ctype.h>
#include <assert.h>

#include "nvmf_internal.h"
#include "session.h"
#include "subsystem.h"
#include "transport.h"
#include "spdk/log.h"
#include "spdk/string.h"
#include "spdk/trace.h"
#include "spdk/nvmf_spec.h"

static TAILQ_HEAD(, spdk_nvmf_subsystem) g_subsystems = TAILQ_HEAD_INITIALIZER(g_subsystems);

struct spdk_nvmf_subsystem *
nvmf_find_subsystem(const char *subnqn, const char *hostnqn)
{
	struct spdk_nvmf_subsystem	*subsystem;
	struct spdk_nvmf_host		*host;

	if (!subnqn || !hostnqn) {
		return NULL;
	}

	TAILQ_FOREACH(subsystem, &g_subsystems, entries) {
		if (strcmp(subnqn, subsystem->subnqn) == 0) {
			if (subsystem->num_hosts == 0) {
				/* No hosts means any host can connect */
				return subsystem;
			}

			TAILQ_FOREACH(host, &subsystem->hosts, link) {
				if (strcmp(hostnqn, host->nqn) == 0) {
					return subsystem;
				}
			}
		}
	}

	return NULL;
}

void
spdk_nvmf_subsystem_poll(struct spdk_nvmf_subsystem *subsystem)
{
	struct nvmf_session *session = subsystem->session;

	if (!session) {
		/* No active connections, so just return */
		return;
	}

	/* For NVMe subsystems, check the backing physical device for completions. */
	if (subsystem->subtype == SPDK_NVMF_SUBTYPE_NVME) {
		session->subsys->ops->poll_for_completions(session);
	}

	/* For each connection in the session, check for completions */
	spdk_nvmf_session_poll(session);
}

static bool
spdk_nvmf_valid_nqn(const char *nqn)
{
	size_t len;

	len = strlen(nqn);
	if (len >= SPDK_NVMF_NQN_MAX_LEN) {
		SPDK_ERRLOG("Invalid NQN \"%s\": length %zu > max %d\n", nqn, len, SPDK_NVMF_NQN_MAX_LEN - 1);
		return false;
	}

	if (strncmp(nqn, "nqn.", 4) != 0) {
		SPDK_ERRLOG("Invalid NQN \"%s\": NQN must begin with \"nqn.\".\n", nqn);
		return false;
	}

	/* yyyy-mm. */
	if (!(isdigit(nqn[4]) && isdigit(nqn[5]) && isdigit(nqn[6]) && isdigit(nqn[7]) &&
	      nqn[8] == '-' && isdigit(nqn[9]) && isdigit(nqn[10]) && nqn[11] == '.')) {
		SPDK_ERRLOG("Invalid date code in NQN \"%s\"\n", nqn);
		return false;
	}

	return true;
}

struct spdk_nvmf_subsystem *
spdk_nvmf_create_subsystem(int num, const char *name,
			   enum spdk_nvmf_subtype subtype, void *cb_ctx,
			   spdk_nvmf_subsystem_connect_fn connect_cb,
			   spdk_nvmf_subsystem_disconnect_fn disconnect_cb)
{
	struct spdk_nvmf_subsystem	*subsystem;

	if (!spdk_nvmf_valid_nqn(name)) {
		return NULL;
	}

	subsystem = calloc(1, sizeof(struct spdk_nvmf_subsystem));
	if (subsystem == NULL) {
		return NULL;
	}

	subsystem->num = num;
	subsystem->subtype = subtype;
	subsystem->cb_ctx = cb_ctx;
	subsystem->connect_cb = connect_cb;
	subsystem->disconnect_cb = disconnect_cb;
	snprintf(subsystem->subnqn, sizeof(subsystem->subnqn), "%s", name);
	TAILQ_INIT(&subsystem->listen_addrs);
	TAILQ_INIT(&subsystem->hosts);

	TAILQ_INSERT_HEAD(&g_subsystems, subsystem, entries);

	return subsystem;
}

void
spdk_nvmf_delete_subsystem(struct spdk_nvmf_subsystem *subsystem)
{
	struct spdk_nvmf_listen_addr	*listen_addr, *listen_addr_tmp;
	struct spdk_nvmf_host		*host, *host_tmp;

	if (!subsystem) {
		return;
	}

	SPDK_TRACELOG(SPDK_TRACE_NVMF, "subsystem is %p\n", subsystem);

	TAILQ_FOREACH_SAFE(listen_addr, &subsystem->listen_addrs, link, listen_addr_tmp) {
		TAILQ_REMOVE(&subsystem->listen_addrs, listen_addr, link);
		free(listen_addr->traddr);
		free(listen_addr->trsvcid);
		free(listen_addr);
		subsystem->num_listen_addrs--;
	}

	TAILQ_FOREACH_SAFE(host, &subsystem->hosts, link, host_tmp) {
		TAILQ_REMOVE(&subsystem->hosts, host, link);
		free(host->nqn);
		free(host);
		subsystem->num_hosts--;
	}

	if (subsystem->session) {
		spdk_nvmf_session_destruct(subsystem->session);
	}
	if (subsystem->ops) {
		subsystem->ops->detach(subsystem);
	}

	TAILQ_REMOVE(&g_subsystems, subsystem, entries);

	free(subsystem);
}

int
spdk_nvmf_subsystem_add_listener(struct spdk_nvmf_subsystem *subsystem,
				 const struct spdk_nvmf_transport *transport,
				 char *traddr, char *trsvcid)
{
	struct spdk_nvmf_listen_addr *listen_addr;
	int rc;

	listen_addr = calloc(1, sizeof(*listen_addr));
	if (!listen_addr) {
		return -1;
	}

	listen_addr->traddr = strdup(traddr);
	if (!listen_addr->traddr) {
		free(listen_addr);
		return -1;
	}

	listen_addr->trsvcid = strdup(trsvcid);
	if (!listen_addr->trsvcid) {
		free(listen_addr->traddr);
		free(listen_addr);
		return -1;
	}

	listen_addr->transport = transport;

	TAILQ_INSERT_HEAD(&subsystem->listen_addrs, listen_addr, link);
	subsystem->num_listen_addrs++;

	rc = transport->listen_addr_add(listen_addr);
	if (rc < 0) {
		SPDK_ERRLOG("Unable to listen on address '%s'\n", traddr);
		return -1;
	}

	return 0;
}

int
spdk_nvmf_subsystem_add_host(struct spdk_nvmf_subsystem *subsystem, char *host_nqn)
{
	struct spdk_nvmf_host *host;

	host = calloc(1, sizeof(*host));
	if (!host) {
		return -1;
	}
	host->nqn = strdup(host_nqn);
	if (!host->nqn) {
		free(host);
		return -1;
	}

	TAILQ_INSERT_HEAD(&subsystem->hosts, host, link);
	subsystem->num_hosts++;

	return 0;
}

int
nvmf_subsystem_add_ctrlr(struct spdk_nvmf_subsystem *subsystem,
			 struct spdk_nvme_ctrlr *ctrlr)
{
	subsystem->dev.direct.ctrlr = ctrlr;
	/* Assume that all I/O will be handled on one thread for now */
	subsystem->dev.direct.io_qpair = spdk_nvme_ctrlr_alloc_io_qpair(ctrlr, 0);
	if (subsystem->dev.direct.io_qpair == NULL) {
		SPDK_ERRLOG("spdk_nvme_ctrlr_alloc_io_qpair() failed\n");
		return -1;
	}
	subsystem->ops = &spdk_nvmf_direct_ctrlr_ops;
	return 0;
}

void
spdk_format_discovery_log(struct spdk_nvmf_discovery_log_page *disc_log, uint32_t length)
{
	int numrec = 0;
	struct spdk_nvmf_subsystem *subsystem;
	struct spdk_nvmf_listen_addr *listen_addr;
	struct spdk_nvmf_discovery_log_page_entry *entry;

	TAILQ_FOREACH(subsystem, &g_subsystems, entries) {
		if (subsystem->subtype == SPDK_NVMF_SUBTYPE_DISCOVERY) {
			continue;
		}

		TAILQ_FOREACH(listen_addr, &subsystem->listen_addrs, link) {
			/* include the discovery log entry */
			if (length > sizeof(struct spdk_nvmf_discovery_log_page)) {
				if (sizeof(struct spdk_nvmf_discovery_log_page) + (numrec + 1) * sizeof(
					    struct spdk_nvmf_discovery_log_page_entry) > length) {
					break;
				}
				entry = &disc_log->entries[numrec];
				entry->portid = numrec;
				entry->cntlid = 0xffff;
				entry->asqsz = g_nvmf_tgt.max_queue_depth;
				entry->subtype = subsystem->subtype;
				snprintf(entry->subnqn, sizeof(entry->subnqn), "%s", subsystem->subnqn);

				listen_addr->transport->listen_addr_discover(listen_addr, entry);
			}
			numrec++;
		}
	}

	disc_log->numrec = numrec;
}

int
spdk_nvmf_subsystem_add_ns(struct spdk_nvmf_subsystem *subsystem, struct spdk_bdev *bdev)
{
	int i = 0;

	assert(subsystem->mode == NVMF_SUBSYSTEM_MODE_VIRTUAL);
	while (i < MAX_VIRTUAL_NAMESPACE && subsystem->dev.virtual.ns_list[i]) {
		i++;
	}
	if (i == MAX_VIRTUAL_NAMESPACE) {
		SPDK_ERRLOG("spdk_nvmf_subsystem_add_ns() failed\n");
		return -1;
	}
	subsystem->dev.virtual.ns_list[i] = bdev;
	subsystem->dev.virtual.ns_count++;
	return 0;
}