Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 809 insertions, 0 deletions

diff --git a/src/spdk/lib/sock/sock.c b/src/spdk/lib/sock/sock.c
new file mode 100644
index 000000000..5ea90385c
--- /dev/null
+++ b/src/spdk/lib/sock/sock.c
@@ -0,0 +1,809 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (c) Intel Corporation. All rights reserved.
+ *   Copyright (c) 2020 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 "spdk/log.h"
+#include "spdk/sock.h"
+#include "spdk_internal/sock.h"
+#include "spdk/queue.h"
+
+#define SPDK_SOCK_DEFAULT_PRIORITY 0
+#define SPDK_SOCK_OPTS_FIELD_OK(opts, field) (offsetof(struct spdk_sock_opts, field) + sizeof(opts->field) <= (opts->opts_size))
+
+static STAILQ_HEAD(, spdk_net_impl) g_net_impls = STAILQ_HEAD_INITIALIZER(g_net_impls);
+
+struct spdk_sock_placement_id_entry {
+	int placement_id;
+	uint32_t ref;
+	struct spdk_sock_group *group;
+	STAILQ_ENTRY(spdk_sock_placement_id_entry) link;
+};
+
+static STAILQ_HEAD(, spdk_sock_placement_id_entry) g_placement_id_map = STAILQ_HEAD_INITIALIZER(
+			g_placement_id_map);
+static pthread_mutex_t g_map_table_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+/* Insert a group into the placement map.
+ * If the group is already in the map, take a reference.
+ */
+static int
+sock_map_insert(int placement_id, struct spdk_sock_group *group)
+{
+	struct spdk_sock_placement_id_entry *entry;
+
+	pthread_mutex_lock(&g_map_table_mutex);
+	STAILQ_FOREACH(entry, &g_placement_id_map, link) {
+		if (placement_id == entry->placement_id) {
+			/* The mapping already exists, it means that different sockets have
+			 * the same placement_ids.
+			 */
+			entry->ref++;
+			pthread_mutex_unlock(&g_map_table_mutex);
+			return 0;
+		}
+	}
+
+	entry = calloc(1, sizeof(*entry));
+	if (!entry) {
+		SPDK_ERRLOG("Cannot allocate an entry for placement_id=%u\n", placement_id);
+		pthread_mutex_unlock(&g_map_table_mutex);
+		return -ENOMEM;
+	}
+
+	entry->placement_id = placement_id;
+	entry->group = group;
+	entry->ref++;
+
+	STAILQ_INSERT_TAIL(&g_placement_id_map, entry, link);
+	pthread_mutex_unlock(&g_map_table_mutex);
+
+	return 0;
+}
+
+/* Release a reference to the group for a given placement_id.
+ * If the reference count is 0, remove the group.
+ */
+static void
+sock_map_release(int placement_id)
+{
+	struct spdk_sock_placement_id_entry *entry;
+
+	pthread_mutex_lock(&g_map_table_mutex);
+	STAILQ_FOREACH(entry, &g_placement_id_map, link) {
+		if (placement_id == entry->placement_id) {
+			assert(entry->ref > 0);
+			entry->ref--;
+			break;
+		}
+	}
+
+	pthread_mutex_unlock(&g_map_table_mutex);
+}
+
+/* Look up the group for a placement_id. */
+static void
+sock_map_lookup(int placement_id, struct spdk_sock_group **group)
+{
+	struct spdk_sock_placement_id_entry *entry;
+
+	*group = NULL;
+	pthread_mutex_lock(&g_map_table_mutex);
+	STAILQ_FOREACH(entry, &g_placement_id_map, link) {
+		if (placement_id == entry->placement_id) {
+			assert(entry->group != NULL);
+			*group = entry->group;
+			break;
+		}
+	}
+	pthread_mutex_unlock(&g_map_table_mutex);
+}
+
+/* Remove the socket group from the map table */
+static void
+sock_remove_sock_group_from_map_table(struct spdk_sock_group *group)
+{
+	struct spdk_sock_placement_id_entry *entry, *tmp;
+
+	pthread_mutex_lock(&g_map_table_mutex);
+	STAILQ_FOREACH_SAFE(entry, &g_placement_id_map, link, tmp) {
+		if (entry->group == group) {
+			STAILQ_REMOVE(&g_placement_id_map, entry, spdk_sock_placement_id_entry, link);
+			free(entry);
+		}
+	}
+	pthread_mutex_unlock(&g_map_table_mutex);
+
+}
+
+int
+spdk_sock_get_optimal_sock_group(struct spdk_sock *sock, struct spdk_sock_group **group)
+{
+	int placement_id = 0, rc;
+
+	rc = sock->net_impl->get_placement_id(sock, &placement_id);
+	if (!rc && (placement_id != 0)) {
+		sock_map_lookup(placement_id, group);
+		return 0;
+	} else {
+		return -1;
+	}
+}
+
+int
+spdk_sock_getaddr(struct spdk_sock *sock, char *saddr, int slen, uint16_t *sport,
+		  char *caddr, int clen, uint16_t *cport)
+{
+	return sock->net_impl->getaddr(sock, saddr, slen, sport, caddr, clen, cport);
+}
+
+void
+spdk_sock_get_default_opts(struct spdk_sock_opts *opts)
+{
+	assert(opts);
+
+	if (SPDK_SOCK_OPTS_FIELD_OK(opts, priority)) {
+		opts->priority = SPDK_SOCK_DEFAULT_PRIORITY;
+	}
+}
+
+/*
+ * opts The opts allocated in the current library.
+ * opts_user The opts passed by the caller.
+ * */
+static void
+sock_init_opts(struct spdk_sock_opts *opts, struct spdk_sock_opts *opts_user)
+{
+	assert(opts);
+	assert(opts_user);
+
+	opts->opts_size = sizeof(*opts);
+	spdk_sock_get_default_opts(opts);
+
+	/* reset the size according to the user */
+	opts->opts_size = opts_user->opts_size;
+	if (SPDK_SOCK_OPTS_FIELD_OK(opts, priority)) {
+		opts->priority = opts_user->priority;
+	}
+}
+
+struct spdk_sock *
+spdk_sock_connect(const char *ip, int port, char *impl_name)
+{
+	struct spdk_sock_opts opts;
+
+	opts.opts_size = sizeof(opts);
+	spdk_sock_get_default_opts(&opts);
+	return spdk_sock_connect_ext(ip, port, impl_name, &opts);
+}
+
+struct spdk_sock *
+spdk_sock_connect_ext(const char *ip, int port, char *impl_name, struct spdk_sock_opts *opts)
+{
+	struct spdk_net_impl *impl = NULL;
+	struct spdk_sock *sock;
+	struct spdk_sock_opts opts_local;
+
+	if (opts == NULL) {
+		SPDK_ERRLOG("the opts should not be NULL pointer\n");
+		return NULL;
+	}
+
+	STAILQ_FOREACH_FROM(impl, &g_net_impls, link) {
+		if (impl_name && strncmp(impl_name, impl->name, strlen(impl->name) + 1)) {
+			continue;
+		}
+
+		sock_init_opts(&opts_local, opts);
+		sock = impl->connect(ip, port, &opts_local);
+		if (sock != NULL) {
+			/* Copy the contents, both the two structures are the same ABI version */
+			memcpy(&sock->opts, &opts_local, sizeof(sock->opts));
+			sock->net_impl = impl;
+			TAILQ_INIT(&sock->queued_reqs);
+			TAILQ_INIT(&sock->pending_reqs);
+			return sock;
+		}
+	}
+
+	return NULL;
+}
+
+struct spdk_sock *
+spdk_sock_listen(const char *ip, int port, char *impl_name)
+{
+	struct spdk_sock_opts opts;
+
+	opts.opts_size = sizeof(opts);
+	spdk_sock_get_default_opts(&opts);
+	return spdk_sock_listen_ext(ip, port, impl_name, &opts);
+}
+
+struct spdk_sock *
+spdk_sock_listen_ext(const char *ip, int port, char *impl_name, struct spdk_sock_opts *opts)
+{
+	struct spdk_net_impl *impl = NULL;
+	struct spdk_sock *sock;
+	struct spdk_sock_opts opts_local;
+
+	if (opts == NULL) {
+		SPDK_ERRLOG("the opts should not be NULL pointer\n");
+		return NULL;
+	}
+
+	STAILQ_FOREACH_FROM(impl, &g_net_impls, link) {
+		if (impl_name && strncmp(impl_name, impl->name, strlen(impl->name) + 1)) {
+			continue;
+		}
+
+		sock_init_opts(&opts_local, opts);
+		sock = impl->listen(ip, port, &opts_local);
+		if (sock != NULL) {
+			/* Copy the contents, both the two structures are the same ABI version */
+			memcpy(&sock->opts, &opts_local, sizeof(sock->opts));
+			sock->net_impl = impl;
+			/* Don't need to initialize the request queues for listen
+			 * sockets. */
+			return sock;
+		}
+	}
+
+	return NULL;
+}
+
+struct spdk_sock *
+spdk_sock_accept(struct spdk_sock *sock)
+{
+	struct spdk_sock *new_sock;
+
+	new_sock = sock->net_impl->accept(sock);
+	if (new_sock != NULL) {
+		/* Inherit the opts from the "accept sock" */
+		new_sock->opts = sock->opts;
+		memcpy(&new_sock->opts, &sock->opts, sizeof(new_sock->opts));
+		new_sock->net_impl = sock->net_impl;
+		TAILQ_INIT(&new_sock->queued_reqs);
+		TAILQ_INIT(&new_sock->pending_reqs);
+	}
+
+	return new_sock;
+}
+
+int
+spdk_sock_close(struct spdk_sock **_sock)
+{
+	struct spdk_sock *sock = *_sock;
+	int rc;
+
+	if (sock == NULL) {
+		errno = EBADF;
+		return -1;
+	}
+
+	if (sock->cb_fn != NULL) {
+		/* This sock is still part of a sock_group. */
+		errno = EBUSY;
+		return -1;
+	}
+
+	sock->flags.closed = true;
+
+	if (sock->cb_cnt > 0) {
+		/* Let the callback unwind before destroying the socket */
+		return 0;
+	}
+
+	spdk_sock_abort_requests(sock);
+
+	rc = sock->net_impl->close(sock);
+	if (rc == 0) {
+		*_sock = NULL;
+	}
+
+	return rc;
+}
+
+ssize_t
+spdk_sock_recv(struct spdk_sock *sock, void *buf, size_t len)
+{
+	if (sock == NULL) {
+		errno = EBADF;
+		return -1;
+	}
+
+	if (sock->flags.closed) {
+		errno = EBADF;
+		return -1;
+	}
+
+	return sock->net_impl->recv(sock, buf, len);
+}
+
+ssize_t
+spdk_sock_readv(struct spdk_sock *sock, struct iovec *iov, int iovcnt)
+{
+	if (sock == NULL) {
+		errno = EBADF;
+		return -1;
+	}
+
+	if (sock->flags.closed) {
+		errno = EBADF;
+		return -1;
+	}
+
+	return sock->net_impl->readv(sock, iov, iovcnt);
+}
+
+ssize_t
+spdk_sock_writev(struct spdk_sock *sock, struct iovec *iov, int iovcnt)
+{
+	if (sock == NULL) {
+		errno = EBADF;
+		return -1;
+	}
+
+	if (sock->flags.closed) {
+		errno = EBADF;
+		return -1;
+	}
+
+	return sock->net_impl->writev(sock, iov, iovcnt);
+}
+
+void
+spdk_sock_writev_async(struct spdk_sock *sock, struct spdk_sock_request *req)
+{
+	assert(req->cb_fn != NULL);
+
+	if (sock == NULL) {
+		req->cb_fn(req->cb_arg, -EBADF);
+		return;
+	}
+
+	if (sock->flags.closed) {
+		req->cb_fn(req->cb_arg, -EBADF);
+		return;
+	}
+
+	sock->net_impl->writev_async(sock, req);
+}
+
+int
+spdk_sock_flush(struct spdk_sock *sock)
+{
+	if (sock == NULL) {
+		return -EBADF;
+	}
+
+	if (sock->flags.closed) {
+		return -EBADF;
+	}
+
+	return sock->net_impl->flush(sock);
+}
+
+int
+spdk_sock_set_recvlowat(struct spdk_sock *sock, int nbytes)
+{
+	return sock->net_impl->set_recvlowat(sock, nbytes);
+}
+
+int
+spdk_sock_set_recvbuf(struct spdk_sock *sock, int sz)
+{
+	return sock->net_impl->set_recvbuf(sock, sz);
+}
+
+int
+spdk_sock_set_sendbuf(struct spdk_sock *sock, int sz)
+{
+	return sock->net_impl->set_sendbuf(sock, sz);
+}
+
+bool
+spdk_sock_is_ipv6(struct spdk_sock *sock)
+{
+	return sock->net_impl->is_ipv6(sock);
+}
+
+bool
+spdk_sock_is_ipv4(struct spdk_sock *sock)
+{
+	return sock->net_impl->is_ipv4(sock);
+}
+
+bool
+spdk_sock_is_connected(struct spdk_sock *sock)
+{
+	return sock->net_impl->is_connected(sock);
+}
+
+struct spdk_sock_group *
+spdk_sock_group_create(void *ctx)
+{
+	struct spdk_net_impl *impl = NULL;
+	struct spdk_sock_group *group;
+	struct spdk_sock_group_impl *group_impl;
+
+	group = calloc(1, sizeof(*group));
+	if (group == NULL) {
+		return NULL;
+	}
+
+	STAILQ_INIT(&group->group_impls);
+
+	STAILQ_FOREACH_FROM(impl, &g_net_impls, link) {
+		group_impl = impl->group_impl_create();
+		if (group_impl != NULL) {
+			STAILQ_INSERT_TAIL(&group->group_impls, group_impl, link);
+			TAILQ_INIT(&group_impl->socks);
+			group_impl->num_removed_socks = 0;
+			group_impl->net_impl = impl;
+		}
+	}
+
+	group->ctx = ctx;
+	return group;
+}
+
+void *
+spdk_sock_group_get_ctx(struct spdk_sock_group *group)
+{
+	if (group == NULL) {
+		return NULL;
+	}
+
+	return group->ctx;
+}
+
+int
+spdk_sock_group_add_sock(struct spdk_sock_group *group, struct spdk_sock *sock,
+			 spdk_sock_cb cb_fn, void *cb_arg)
+{
+	struct spdk_sock_group_impl *group_impl = NULL;
+	int rc, placement_id = 0;
+
+	if (cb_fn == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (sock->group_impl != NULL) {
+		/*
+		 * This sock is already part of a sock_group.  Currently we don't
+		 *  support this.
+		 */
+		errno = EBUSY;
+		return -1;
+	}
+
+	rc = sock->net_impl->get_placement_id(sock, &placement_id);
+	if (!rc && (placement_id != 0)) {
+		rc = sock_map_insert(placement_id, group);
+		if (rc < 0) {
+			return -1;
+		}
+	}
+
+	STAILQ_FOREACH_FROM(group_impl, &group->group_impls, link) {
+		if (sock->net_impl == group_impl->net_impl) {
+			break;
+		}
+	}
+
+	if (group_impl == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	rc = group_impl->net_impl->group_impl_add_sock(group_impl, sock);
+	if (rc == 0) {
+		TAILQ_INSERT_TAIL(&group_impl->socks, sock, link);
+		sock->group_impl = group_impl;
+		sock->cb_fn = cb_fn;
+		sock->cb_arg = cb_arg;
+	}
+
+	return rc;
+}
+
+int
+spdk_sock_group_remove_sock(struct spdk_sock_group *group, struct spdk_sock *sock)
+{
+	struct spdk_sock_group_impl *group_impl = NULL;
+	int rc, placement_id = 0;
+
+	STAILQ_FOREACH_FROM(group_impl, &group->group_impls, link) {
+		if (sock->net_impl == group_impl->net_impl) {
+			break;
+		}
+	}
+
+	if (group_impl == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	assert(group_impl == sock->group_impl);
+
+	rc = sock->net_impl->get_placement_id(sock, &placement_id);
+	if (!rc && (placement_id != 0)) {
+		sock_map_release(placement_id);
+	}
+
+	rc = group_impl->net_impl->group_impl_remove_sock(group_impl, sock);
+	if (rc == 0) {
+		TAILQ_REMOVE(&group_impl->socks, sock, link);
+		assert(group_impl->num_removed_socks < MAX_EVENTS_PER_POLL);
+		group_impl->removed_socks[group_impl->num_removed_socks] = (uintptr_t)sock;
+		group_impl->num_removed_socks++;
+		sock->group_impl = NULL;
+		sock->cb_fn = NULL;
+		sock->cb_arg = NULL;
+	}
+
+	return rc;
+}
+
+int
+spdk_sock_group_poll(struct spdk_sock_group *group)
+{
+	return spdk_sock_group_poll_count(group, MAX_EVENTS_PER_POLL);
+}
+
+static int
+sock_group_impl_poll_count(struct spdk_sock_group_impl *group_impl,
+			   struct spdk_sock_group *group,
+			   int max_events)
+{
+	struct spdk_sock *socks[MAX_EVENTS_PER_POLL];
+	int num_events, i;
+
+	if (TAILQ_EMPTY(&group_impl->socks)) {
+		return 0;
+	}
+
+	/* The number of removed sockets should be reset for each call to poll. */
+	group_impl->num_removed_socks = 0;
+
+	num_events = group_impl->net_impl->group_impl_poll(group_impl, max_events, socks);
+	if (num_events == -1) {
+		return -1;
+	}
+
+	for (i = 0; i < num_events; i++) {
+		struct spdk_sock *sock = socks[i];
+		int j;
+		bool valid = true;
+		for (j = 0; j < group_impl->num_removed_socks; j++) {
+			if ((uintptr_t)sock == group_impl->removed_socks[j]) {
+				valid = false;
+				break;
+			}
+		}
+
+		if (valid) {
+			assert(sock->cb_fn != NULL);
+			sock->cb_fn(sock->cb_arg, group, sock);
+		}
+	}
+
+	return num_events;
+}
+
+int
+spdk_sock_group_poll_count(struct spdk_sock_group *group, int max_events)
+{
+	struct spdk_sock_group_impl *group_impl = NULL;
+	int rc, num_events = 0;
+
+	if (max_events < 1) {
+		errno = -EINVAL;
+		return -1;
+	}
+
+	/*
+	 * Only poll for up to 32 events at a time - if more events are pending,
+	 *  the next call to this function will reap them.
+	 */
+	if (max_events > MAX_EVENTS_PER_POLL) {
+		max_events = MAX_EVENTS_PER_POLL;
+	}
+
+	STAILQ_FOREACH_FROM(group_impl, &group->group_impls, link) {
+		rc = sock_group_impl_poll_count(group_impl, group, max_events);
+		if (rc < 0) {
+			num_events = -1;
+			SPDK_ERRLOG("group_impl_poll_count for net(%s) failed\n",
+				    group_impl->net_impl->name);
+		} else if (num_events >= 0) {
+			num_events += rc;
+		}
+	}
+
+	return num_events;
+}
+
+int
+spdk_sock_group_close(struct spdk_sock_group **group)
+{
+	struct spdk_sock_group_impl *group_impl = NULL, *tmp;
+	int rc;
+
+	if (*group == NULL) {
+		errno = EBADF;
+		return -1;
+	}
+
+	STAILQ_FOREACH_SAFE(group_impl, &(*group)->group_impls, link, tmp) {
+		if (!TAILQ_EMPTY(&group_impl->socks)) {
+			errno = EBUSY;
+			return -1;
+		}
+	}
+
+	STAILQ_FOREACH_SAFE(group_impl, &(*group)->group_impls, link, tmp) {
+		rc = group_impl->net_impl->group_impl_close(group_impl);
+		if (rc != 0) {
+			SPDK_ERRLOG("group_impl_close for net(%s) failed\n",
+				    group_impl->net_impl->name);
+		}
+	}
+
+	sock_remove_sock_group_from_map_table(*group);
+	free(*group);
+	*group = NULL;
+
+	return 0;
+}
+
+static inline struct spdk_net_impl *
+sock_get_impl_by_name(const char *impl_name)
+{
+	struct spdk_net_impl *impl;
+
+	assert(impl_name != NULL);
+	STAILQ_FOREACH(impl, &g_net_impls, link) {
+		if (0 == strcmp(impl_name, impl->name)) {
+			return impl;
+		}
+	}
+
+	return NULL;
+}
+
+int
+spdk_sock_impl_get_opts(const char *impl_name, struct spdk_sock_impl_opts *opts, size_t *len)
+{
+	struct spdk_net_impl *impl;
+
+	if (!impl_name || !opts || !len) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	impl = sock_get_impl_by_name(impl_name);
+	if (!impl) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (!impl->get_opts) {
+		errno = ENOTSUP;
+		return -1;
+	}
+
+	return impl->get_opts(opts, len);
+}
+
+int
+spdk_sock_impl_set_opts(const char *impl_name, const struct spdk_sock_impl_opts *opts, size_t len)
+{
+	struct spdk_net_impl *impl;
+
+	if (!impl_name || !opts) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	impl = sock_get_impl_by_name(impl_name);
+	if (!impl) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (!impl->set_opts) {
+		errno = ENOTSUP;
+		return -1;
+	}
+
+	return impl->set_opts(opts, len);
+}
+
+void
+spdk_sock_write_config_json(struct spdk_json_write_ctx *w)
+{
+	struct spdk_net_impl *impl;
+	struct spdk_sock_impl_opts opts;
+	size_t len;
+
+	assert(w != NULL);
+
+	spdk_json_write_array_begin(w);
+
+	STAILQ_FOREACH(impl, &g_net_impls, link) {
+		if (!impl->get_opts) {
+			continue;
+		}
+
+		len = sizeof(opts);
+		if (impl->get_opts(&opts, &len) == 0) {
+			spdk_json_write_object_begin(w);
+			spdk_json_write_named_string(w, "method", "sock_impl_set_options");
+			spdk_json_write_named_object_begin(w, "params");
+			spdk_json_write_named_string(w, "impl_name", impl->name);
+			spdk_json_write_named_uint32(w, "recv_buf_size", opts.recv_buf_size);
+			spdk_json_write_named_uint32(w, "send_buf_size", opts.send_buf_size);
+			spdk_json_write_named_bool(w, "enable_recv_pipe", opts.enable_recv_pipe);
+			spdk_json_write_named_bool(w, "enable_zerocopy_send", opts.enable_zerocopy_send);
+			spdk_json_write_object_end(w);
+			spdk_json_write_object_end(w);
+		} else {
+			SPDK_ERRLOG("Failed to get socket options for socket implementation %s\n", impl->name);
+		}
+	}
+
+	spdk_json_write_array_end(w);
+}
+
+void
+spdk_net_impl_register(struct spdk_net_impl *impl, int priority)
+{
+	struct spdk_net_impl *cur, *prev;
+
+	impl->priority = priority;
+	prev = NULL;
+	STAILQ_FOREACH(cur, &g_net_impls, link) {
+		if (impl->priority > cur->priority) {
+			break;
+		}
+		prev = cur;
+	}
+
+	if (prev) {
+		STAILQ_INSERT_AFTER(&g_net_impls, prev, impl, link);
+	} else {
+		STAILQ_INSERT_HEAD(&g_net_impls, impl, link);
+	}
+}