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

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

15 files changed, 4842 insertions, 0 deletions

diff --git a/src/spdk/dpdk/lib/librte_ring/Makefile b/src/spdk/dpdk/lib/librte_ring/Makefile
new file mode 100644
index 000000000..83a9d0840
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/Makefile
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2010-2014 Intel Corporation
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# library name
+LIB = librte_ring.a
+
+CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR) -O3
+LDLIBS += -lrte_eal
+
+EXPORT_MAP := rte_ring_version.map
+
+# all source are stored in SRCS-y
+SRCS-$(CONFIG_RTE_LIBRTE_RING) := rte_ring.c
+
+# install includes
+SYMLINK-$(CONFIG_RTE_LIBRTE_RING)-include := rte_ring.h \
+					rte_ring_core.h \
+					rte_ring_elem.h \
+					rte_ring_generic.h \
+					rte_ring_c11_mem.h \
+					rte_ring_hts.h \
+					rte_ring_hts_c11_mem.h \
+					rte_ring_peek.h \
+					rte_ring_peek_c11_mem.h \
+					rte_ring_rts.h \
+					rte_ring_rts_c11_mem.h
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/src/spdk/dpdk/lib/librte_ring/meson.build b/src/spdk/dpdk/lib/librte_ring/meson.build
new file mode 100644
index 000000000..31c0b4649
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/meson.build
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2017 Intel Corporation
+
+sources = files('rte_ring.c')
+headers = files('rte_ring.h',
+		'rte_ring_core.h',
+		'rte_ring_elem.h',
+		'rte_ring_c11_mem.h',
+		'rte_ring_generic.h',
+		'rte_ring_hts.h',
+		'rte_ring_hts_c11_mem.h',
+		'rte_ring_peek.h',
+		'rte_ring_peek_c11_mem.h',
+		'rte_ring_rts.h',
+		'rte_ring_rts_c11_mem.h')
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring.c b/src/spdk/dpdk/lib/librte_ring/rte_ring.c
new file mode 100644
index 000000000..ebe5ccf0d
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring.c
@@ -0,0 +1,418 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2015 Intel Corporation
+ * Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/queue.h>
+
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_malloc.h>
+#include <rte_launch.h>
+#include <rte_eal.h>
+#include <rte_eal_memconfig.h>
+#include <rte_atomic.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_branch_prediction.h>
+#include <rte_errno.h>
+#include <rte_string_fns.h>
+#include <rte_spinlock.h>
+#include <rte_tailq.h>
+
+#include "rte_ring.h"
+#include "rte_ring_elem.h"
+
+TAILQ_HEAD(rte_ring_list, rte_tailq_entry);
+
+static struct rte_tailq_elem rte_ring_tailq = {
+	.name = RTE_TAILQ_RING_NAME,
+};
+EAL_REGISTER_TAILQ(rte_ring_tailq)
+
+/* true if x is a power of 2 */
+#define POWEROF2(x) ((((x)-1) & (x)) == 0)
+
+/* by default set head/tail distance as 1/8 of ring capacity */
+#define HTD_MAX_DEF	8
+
+/* return the size of memory occupied by a ring */
+ssize_t
+rte_ring_get_memsize_elem(unsigned int esize, unsigned int count)
+{
+	ssize_t sz;
+
+	/* Check if element size is a multiple of 4B */
+	if (esize % 4 != 0) {
+		RTE_LOG(ERR, RING, "element size is not a multiple of 4\n");
+
+		return -EINVAL;
+	}
+
+	/* count must be a power of 2 */
+	if ((!POWEROF2(count)) || (count > RTE_RING_SZ_MASK )) {
+		RTE_LOG(ERR, RING,
+			"Requested number of elements is invalid, must be power of 2, and not exceed %u\n",
+			RTE_RING_SZ_MASK);
+
+		return -EINVAL;
+	}
+
+	sz = sizeof(struct rte_ring) + count * esize;
+	sz = RTE_ALIGN(sz, RTE_CACHE_LINE_SIZE);
+	return sz;
+}
+
+/* return the size of memory occupied by a ring */
+ssize_t
+rte_ring_get_memsize(unsigned int count)
+{
+	return rte_ring_get_memsize_elem(sizeof(void *), count);
+}
+
+/*
+ * internal helper function to reset prod/cons head-tail values.
+ */
+static void
+reset_headtail(void *p)
+{
+	struct rte_ring_headtail *ht;
+	struct rte_ring_hts_headtail *ht_hts;
+	struct rte_ring_rts_headtail *ht_rts;
+
+	ht = p;
+	ht_hts = p;
+	ht_rts = p;
+
+	switch (ht->sync_type) {
+	case RTE_RING_SYNC_MT:
+	case RTE_RING_SYNC_ST:
+		ht->head = 0;
+		ht->tail = 0;
+		break;
+	case RTE_RING_SYNC_MT_RTS:
+		ht_rts->head.raw = 0;
+		ht_rts->tail.raw = 0;
+		break;
+	case RTE_RING_SYNC_MT_HTS:
+		ht_hts->ht.raw = 0;
+		break;
+	default:
+		/* unknown sync mode */
+		RTE_ASSERT(0);
+	}
+}
+
+void
+rte_ring_reset(struct rte_ring *r)
+{
+	reset_headtail(&r->prod);
+	reset_headtail(&r->cons);
+}
+
+/*
+ * helper function, calculates sync_type values for prod and cons
+ * based on input flags. Returns zero at success or negative
+ * errno value otherwise.
+ */
+static int
+get_sync_type(uint32_t flags, enum rte_ring_sync_type *prod_st,
+	enum rte_ring_sync_type *cons_st)
+{
+	static const uint32_t prod_st_flags =
+		(RING_F_SP_ENQ | RING_F_MP_RTS_ENQ | RING_F_MP_HTS_ENQ);
+	static const uint32_t cons_st_flags =
+		(RING_F_SC_DEQ | RING_F_MC_RTS_DEQ | RING_F_MC_HTS_DEQ);
+
+	switch (flags & prod_st_flags) {
+	case 0:
+		*prod_st = RTE_RING_SYNC_MT;
+		break;
+	case RING_F_SP_ENQ:
+		*prod_st = RTE_RING_SYNC_ST;
+		break;
+	case RING_F_MP_RTS_ENQ:
+		*prod_st = RTE_RING_SYNC_MT_RTS;
+		break;
+	case RING_F_MP_HTS_ENQ:
+		*prod_st = RTE_RING_SYNC_MT_HTS;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (flags & cons_st_flags) {
+	case 0:
+		*cons_st = RTE_RING_SYNC_MT;
+		break;
+	case RING_F_SC_DEQ:
+		*cons_st = RTE_RING_SYNC_ST;
+		break;
+	case RING_F_MC_RTS_DEQ:
+		*cons_st = RTE_RING_SYNC_MT_RTS;
+		break;
+	case RING_F_MC_HTS_DEQ:
+		*cons_st = RTE_RING_SYNC_MT_HTS;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int
+rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
+	unsigned flags)
+{
+	int ret;
+
+	/* compilation-time checks */
+	RTE_BUILD_BUG_ON((sizeof(struct rte_ring) &
+			  RTE_CACHE_LINE_MASK) != 0);
+	RTE_BUILD_BUG_ON((offsetof(struct rte_ring, cons) &
+			  RTE_CACHE_LINE_MASK) != 0);
+	RTE_BUILD_BUG_ON((offsetof(struct rte_ring, prod) &
+			  RTE_CACHE_LINE_MASK) != 0);
+
+	RTE_BUILD_BUG_ON(offsetof(struct rte_ring_headtail, sync_type) !=
+		offsetof(struct rte_ring_hts_headtail, sync_type));
+	RTE_BUILD_BUG_ON(offsetof(struct rte_ring_headtail, tail) !=
+		offsetof(struct rte_ring_hts_headtail, ht.pos.tail));
+
+	RTE_BUILD_BUG_ON(offsetof(struct rte_ring_headtail, sync_type) !=
+		offsetof(struct rte_ring_rts_headtail, sync_type));
+	RTE_BUILD_BUG_ON(offsetof(struct rte_ring_headtail, tail) !=
+		offsetof(struct rte_ring_rts_headtail, tail.val.pos));
+
+	/* init the ring structure */
+	memset(r, 0, sizeof(*r));
+	ret = strlcpy(r->name, name, sizeof(r->name));
+	if (ret < 0 || ret >= (int)sizeof(r->name))
+		return -ENAMETOOLONG;
+	r->flags = flags;
+	ret = get_sync_type(flags, &r->prod.sync_type, &r->cons.sync_type);
+	if (ret != 0)
+		return ret;
+
+	if (flags & RING_F_EXACT_SZ) {
+		r->size = rte_align32pow2(count + 1);
+		r->mask = r->size - 1;
+		r->capacity = count;
+	} else {
+		if ((!POWEROF2(count)) || (count > RTE_RING_SZ_MASK)) {
+			RTE_LOG(ERR, RING,
+				"Requested size is invalid, must be power of 2, and not exceed the size limit %u\n",
+				RTE_RING_SZ_MASK);
+			return -EINVAL;
+		}
+		r->size = count;
+		r->mask = count - 1;
+		r->capacity = r->mask;
+	}
+
+	/* set default values for head-tail distance */
+	if (flags & RING_F_MP_RTS_ENQ)
+		rte_ring_set_prod_htd_max(r, r->capacity / HTD_MAX_DEF);
+	if (flags & RING_F_MC_RTS_DEQ)
+		rte_ring_set_cons_htd_max(r, r->capacity / HTD_MAX_DEF);
+
+	return 0;
+}
+
+/* create the ring for a given element size */
+struct rte_ring *
+rte_ring_create_elem(const char *name, unsigned int esize, unsigned int count,
+		int socket_id, unsigned int flags)
+{
+	char mz_name[RTE_MEMZONE_NAMESIZE];
+	struct rte_ring *r;
+	struct rte_tailq_entry *te;
+	const struct rte_memzone *mz;
+	ssize_t ring_size;
+	int mz_flags = 0;
+	struct rte_ring_list* ring_list = NULL;
+	const unsigned int requested_count = count;
+	int ret;
+
+	ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+
+	/* for an exact size ring, round up from count to a power of two */
+	if (flags & RING_F_EXACT_SZ)
+		count = rte_align32pow2(count + 1);
+
+	ring_size = rte_ring_get_memsize_elem(esize, count);
+	if (ring_size < 0) {
+		rte_errno = ring_size;
+		return NULL;
+	}
+
+	ret = snprintf(mz_name, sizeof(mz_name), "%s%s",
+		RTE_RING_MZ_PREFIX, name);
+	if (ret < 0 || ret >= (int)sizeof(mz_name)) {
+		rte_errno = ENAMETOOLONG;
+		return NULL;
+	}
+
+	te = rte_zmalloc("RING_TAILQ_ENTRY", sizeof(*te), 0);
+	if (te == NULL) {
+		RTE_LOG(ERR, RING, "Cannot reserve memory for tailq\n");
+		rte_errno = ENOMEM;
+		return NULL;
+	}
+
+	rte_mcfg_tailq_write_lock();
+
+	/* reserve a memory zone for this ring. If we can't get rte_config or
+	 * we are secondary process, the memzone_reserve function will set
+	 * rte_errno for us appropriately - hence no check in this this function */
+	mz = rte_memzone_reserve_aligned(mz_name, ring_size, socket_id,
+					 mz_flags, __alignof__(*r));
+	if (mz != NULL) {
+		r = mz->addr;
+		/* no need to check return value here, we already checked the
+		 * arguments above */
+		rte_ring_init(r, name, requested_count, flags);
+
+		te->data = (void *) r;
+		r->memzone = mz;
+
+		TAILQ_INSERT_TAIL(ring_list, te, next);
+	} else {
+		r = NULL;
+		RTE_LOG(ERR, RING, "Cannot reserve memory\n");
+		rte_free(te);
+	}
+	rte_mcfg_tailq_write_unlock();
+
+	return r;
+}
+
+/* create the ring */
+struct rte_ring *
+rte_ring_create(const char *name, unsigned int count, int socket_id,
+		unsigned int flags)
+{
+	return rte_ring_create_elem(name, sizeof(void *), count, socket_id,
+		flags);
+}
+
+/* free the ring */
+void
+rte_ring_free(struct rte_ring *r)
+{
+	struct rte_ring_list *ring_list = NULL;
+	struct rte_tailq_entry *te;
+
+	if (r == NULL)
+		return;
+
+	/*
+	 * Ring was not created with rte_ring_create,
+	 * therefore, there is no memzone to free.
+	 */
+	if (r->memzone == NULL) {
+		RTE_LOG(ERR, RING,
+			"Cannot free ring, not created with rte_ring_create()\n");
+		return;
+	}
+
+	if (rte_memzone_free(r->memzone) != 0) {
+		RTE_LOG(ERR, RING, "Cannot free memory\n");
+		return;
+	}
+
+	ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+	rte_mcfg_tailq_write_lock();
+
+	/* find out tailq entry */
+	TAILQ_FOREACH(te, ring_list, next) {
+		if (te->data == (void *) r)
+			break;
+	}
+
+	if (te == NULL) {
+		rte_mcfg_tailq_write_unlock();
+		return;
+	}
+
+	TAILQ_REMOVE(ring_list, te, next);
+
+	rte_mcfg_tailq_write_unlock();
+
+	rte_free(te);
+}
+
+/* dump the status of the ring on the console */
+void
+rte_ring_dump(FILE *f, const struct rte_ring *r)
+{
+	fprintf(f, "ring <%s>@%p\n", r->name, r);
+	fprintf(f, "  flags=%x\n", r->flags);
+	fprintf(f, "  size=%"PRIu32"\n", r->size);
+	fprintf(f, "  capacity=%"PRIu32"\n", r->capacity);
+	fprintf(f, "  ct=%"PRIu32"\n", r->cons.tail);
+	fprintf(f, "  ch=%"PRIu32"\n", r->cons.head);
+	fprintf(f, "  pt=%"PRIu32"\n", r->prod.tail);
+	fprintf(f, "  ph=%"PRIu32"\n", r->prod.head);
+	fprintf(f, "  used=%u\n", rte_ring_count(r));
+	fprintf(f, "  avail=%u\n", rte_ring_free_count(r));
+}
+
+/* dump the status of all rings on the console */
+void
+rte_ring_list_dump(FILE *f)
+{
+	const struct rte_tailq_entry *te;
+	struct rte_ring_list *ring_list;
+
+	ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+
+	rte_mcfg_tailq_read_lock();
+
+	TAILQ_FOREACH(te, ring_list, next) {
+		rte_ring_dump(f, (struct rte_ring *) te->data);
+	}
+
+	rte_mcfg_tailq_read_unlock();
+}
+
+/* search a ring from its name */
+struct rte_ring *
+rte_ring_lookup(const char *name)
+{
+	struct rte_tailq_entry *te;
+	struct rte_ring *r = NULL;
+	struct rte_ring_list *ring_list;
+
+	ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+
+	rte_mcfg_tailq_read_lock();
+
+	TAILQ_FOREACH(te, ring_list, next) {
+		r = (struct rte_ring *) te->data;
+		if (strncmp(name, r->name, RTE_RING_NAMESIZE) == 0)
+			break;
+	}
+
+	rte_mcfg_tailq_read_unlock();
+
+	if (te == NULL) {
+		rte_errno = ENOENT;
+		return NULL;
+	}
+
+	return r;
+}
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring.h b/src/spdk/dpdk/lib/librte_ring/rte_ring.h
new file mode 100644
index 000000000..86faede81
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring.h
@@ -0,0 +1,1037 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_H_
+#define _RTE_RING_H_
+
+/**
+ * @file
+ * RTE Ring
+ *
+ * The Ring Manager is a fixed-size queue, implemented as a table of
+ * pointers. Head and tail pointers are modified atomically, allowing
+ * concurrent access to it. It has the following features:
+ *
+ * - FIFO (First In First Out)
+ * - Maximum size is fixed; the pointers are stored in a table.
+ * - Lockless implementation.
+ * - Multi- or single-consumer dequeue.
+ * - Multi- or single-producer enqueue.
+ * - Bulk dequeue.
+ * - Bulk enqueue.
+ * - Ability to select different sync modes for producer/consumer.
+ * - Dequeue start/finish (depending on consumer sync modes).
+ * - Enqueue start/finish (depending on producer sync mode).
+ *
+ * Note: the ring implementation is not preemptible. Refer to Programmer's
+ * guide/Environment Abstraction Layer/Multiple pthread/Known Issues/rte_ring
+ * for more information.
+ *
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_ring_core.h>
+
+/**
+ * Calculate the memory size needed for a ring
+ *
+ * This function returns the number of bytes needed for a ring, given
+ * the number of elements in it. This value is the sum of the size of
+ * the structure rte_ring and the size of the memory needed by the
+ * objects pointers. The value is aligned to a cache line size.
+ *
+ * @param count
+ *   The number of elements in the ring (must be a power of 2).
+ * @return
+ *   - The memory size needed for the ring on success.
+ *   - -EINVAL if count is not a power of 2.
+ */
+ssize_t rte_ring_get_memsize(unsigned count);
+
+/**
+ * Initialize a ring structure.
+ *
+ * Initialize a ring structure in memory pointed by "r". The size of the
+ * memory area must be large enough to store the ring structure and the
+ * object table. It is advised to use rte_ring_get_memsize() to get the
+ * appropriate size.
+ *
+ * The ring size is set to *count*, which must be a power of two. Water
+ * marking is disabled by default. The real usable ring size is
+ * *count-1* instead of *count* to differentiate a free ring from an
+ * empty ring.
+ *
+ * The ring is not added in RTE_TAILQ_RING global list. Indeed, the
+ * memory given by the caller may not be shareable among dpdk
+ * processes.
+ *
+ * @param r
+ *   The pointer to the ring structure followed by the objects table.
+ * @param name
+ *   The name of the ring.
+ * @param count
+ *   The number of elements in the ring (must be a power of 2).
+ * @param flags
+ *   An OR of the following:
+ *   - One of mutually exclusive flags that define producer behavior:
+ *      - RING_F_SP_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "single-producer".
+ *      - RING_F_MP_RTS_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "multi-producer RTS mode".
+ *      - RING_F_MP_HTS_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "multi-producer HTS mode".
+ *     If none of these flags is set, then default "multi-producer"
+ *     behavior is selected.
+ *   - One of mutually exclusive flags that define consumer behavior:
+ *      - RING_F_SC_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "single-consumer". Otherwise, it is "multi-consumers".
+ *      - RING_F_MC_RTS_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "multi-consumer RTS mode".
+ *      - RING_F_MC_HTS_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "multi-consumer HTS mode".
+ *     If none of these flags is set, then default "multi-consumer"
+ *     behavior is selected.
+ * @return
+ *   0 on success, or a negative value on error.
+ */
+int rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
+	unsigned flags);
+
+/**
+ * Create a new ring named *name* in memory.
+ *
+ * This function uses ``memzone_reserve()`` to allocate memory. Then it
+ * calls rte_ring_init() to initialize an empty ring.
+ *
+ * The new ring size is set to *count*, which must be a power of
+ * two. Water marking is disabled by default. The real usable ring size
+ * is *count-1* instead of *count* to differentiate a free ring from an
+ * empty ring.
+ *
+ * The ring is added in RTE_TAILQ_RING list.
+ *
+ * @param name
+ *   The name of the ring.
+ * @param count
+ *   The size of the ring (must be a power of 2).
+ * @param socket_id
+ *   The *socket_id* argument is the socket identifier in case of
+ *   NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
+ *   constraint for the reserved zone.
+ * @param flags
+ *   An OR of the following:
+ *   - One of mutually exclusive flags that define producer behavior:
+ *      - RING_F_SP_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "single-producer".
+ *      - RING_F_MP_RTS_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "multi-producer RTS mode".
+ *      - RING_F_MP_HTS_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "multi-producer HTS mode".
+ *     If none of these flags is set, then default "multi-producer"
+ *     behavior is selected.
+ *   - One of mutually exclusive flags that define consumer behavior:
+ *      - RING_F_SC_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "single-consumer". Otherwise, it is "multi-consumers".
+ *      - RING_F_MC_RTS_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "multi-consumer RTS mode".
+ *      - RING_F_MC_HTS_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "multi-consumer HTS mode".
+ *     If none of these flags is set, then default "multi-consumer"
+ *     behavior is selected.
+ * @return
+ *   On success, the pointer to the new allocated ring. NULL on error with
+ *    rte_errno set appropriately. Possible errno values include:
+ *    - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
+ *    - E_RTE_SECONDARY - function was called from a secondary process instance
+ *    - EINVAL - count provided is not a power of 2
+ *    - ENOSPC - the maximum number of memzones has already been allocated
+ *    - EEXIST - a memzone with the same name already exists
+ *    - ENOMEM - no appropriate memory area found in which to create memzone
+ */
+struct rte_ring *rte_ring_create(const char *name, unsigned count,
+				 int socket_id, unsigned flags);
+
+/**
+ * De-allocate all memory used by the ring.
+ *
+ * @param r
+ *   Ring to free
+ */
+void rte_ring_free(struct rte_ring *r);
+
+/**
+ * Dump the status of the ring to a file.
+ *
+ * @param f
+ *   A pointer to a file for output
+ * @param r
+ *   A pointer to the ring structure.
+ */
+void rte_ring_dump(FILE *f, const struct rte_ring *r);
+
+/* the actual enqueue of pointers on the ring.
+ * Placed here since identical code needed in both
+ * single and multi producer enqueue functions */
+#define ENQUEUE_PTRS(r, ring_start, prod_head, obj_table, n, obj_type) do { \
+	unsigned int i; \
+	const uint32_t size = (r)->size; \
+	uint32_t idx = prod_head & (r)->mask; \
+	obj_type *ring = (obj_type *)ring_start; \
+	if (likely(idx + n < size)) { \
+		for (i = 0; i < (n & ((~(unsigned)0x3))); i+=4, idx+=4) { \
+			ring[idx] = obj_table[i]; \
+			ring[idx+1] = obj_table[i+1]; \
+			ring[idx+2] = obj_table[i+2]; \
+			ring[idx+3] = obj_table[i+3]; \
+		} \
+		switch (n & 0x3) { \
+		case 3: \
+			ring[idx++] = obj_table[i++]; /* fallthrough */ \
+		case 2: \
+			ring[idx++] = obj_table[i++]; /* fallthrough */ \
+		case 1: \
+			ring[idx++] = obj_table[i++]; \
+		} \
+	} else { \
+		for (i = 0; idx < size; i++, idx++)\
+			ring[idx] = obj_table[i]; \
+		for (idx = 0; i < n; i++, idx++) \
+			ring[idx] = obj_table[i]; \
+	} \
+} while (0)
+
+/* the actual copy of pointers on the ring to obj_table.
+ * Placed here since identical code needed in both
+ * single and multi consumer dequeue functions */
+#define DEQUEUE_PTRS(r, ring_start, cons_head, obj_table, n, obj_type) do { \
+	unsigned int i; \
+	uint32_t idx = cons_head & (r)->mask; \
+	const uint32_t size = (r)->size; \
+	obj_type *ring = (obj_type *)ring_start; \
+	if (likely(idx + n < size)) { \
+		for (i = 0; i < (n & (~(unsigned)0x3)); i+=4, idx+=4) {\
+			obj_table[i] = ring[idx]; \
+			obj_table[i+1] = ring[idx+1]; \
+			obj_table[i+2] = ring[idx+2]; \
+			obj_table[i+3] = ring[idx+3]; \
+		} \
+		switch (n & 0x3) { \
+		case 3: \
+			obj_table[i++] = ring[idx++]; /* fallthrough */ \
+		case 2: \
+			obj_table[i++] = ring[idx++]; /* fallthrough */ \
+		case 1: \
+			obj_table[i++] = ring[idx++]; \
+		} \
+	} else { \
+		for (i = 0; idx < size; i++, idx++) \
+			obj_table[i] = ring[idx]; \
+		for (idx = 0; i < n; i++, idx++) \
+			obj_table[i] = ring[idx]; \
+	} \
+} while (0)
+
+/* Between load and load. there might be cpu reorder in weak model
+ * (powerpc/arm).
+ * There are 2 choices for the users
+ * 1.use rmb() memory barrier
+ * 2.use one-direction load_acquire/store_release barrier,defined by
+ * CONFIG_RTE_USE_C11_MEM_MODEL=y
+ * It depends on performance test results.
+ * By default, move common functions to rte_ring_generic.h
+ */
+#ifdef RTE_USE_C11_MEM_MODEL
+#include "rte_ring_c11_mem.h"
+#else
+#include "rte_ring_generic.h"
+#endif
+
+/**
+ * @internal Enqueue several objects on the ring
+ *
+  * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Enqueue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param is_sp
+ *   Indicates whether to use single producer or multi-producer head update
+ * @param free_space
+ *   returns the amount of space after the enqueue operation has finished
+ * @return
+ *   Actual number of objects enqueued.
+ *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_enqueue(struct rte_ring *r, void * const *obj_table,
+		 unsigned int n, enum rte_ring_queue_behavior behavior,
+		 unsigned int is_sp, unsigned int *free_space)
+{
+	uint32_t prod_head, prod_next;
+	uint32_t free_entries;
+
+	n = __rte_ring_move_prod_head(r, is_sp, n, behavior,
+			&prod_head, &prod_next, &free_entries);
+	if (n == 0)
+		goto end;
+
+	ENQUEUE_PTRS(r, &r[1], prod_head, obj_table, n, void *);
+
+	update_tail(&r->prod, prod_head, prod_next, is_sp, 1);
+end:
+	if (free_space != NULL)
+		*free_space = free_entries - n;
+	return n;
+}
+
+/**
+ * @internal Dequeue several objects from the ring
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to pull from the ring.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Dequeue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param is_sc
+ *   Indicates whether to use single consumer or multi-consumer head update
+ * @param available
+ *   returns the number of remaining ring entries after the dequeue has finished
+ * @return
+ *   - Actual number of objects dequeued.
+ *     If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_dequeue(struct rte_ring *r, void **obj_table,
+		 unsigned int n, enum rte_ring_queue_behavior behavior,
+		 unsigned int is_sc, unsigned int *available)
+{
+	uint32_t cons_head, cons_next;
+	uint32_t entries;
+
+	n = __rte_ring_move_cons_head(r, (int)is_sc, n, behavior,
+			&cons_head, &cons_next, &entries);
+	if (n == 0)
+		goto end;
+
+	DEQUEUE_PTRS(r, &r[1], cons_head, obj_table, n, void *);
+
+	update_tail(&r->cons, cons_head, cons_next, is_sc, 0);
+
+end:
+	if (available != NULL)
+		*available = entries - n;
+	return n;
+}
+
+/**
+ * Enqueue several objects on the ring (multi-producers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * producer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_mp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+			RTE_RING_SYNC_MT, free_space);
+}
+
+/**
+ * Enqueue several objects on a ring (NOT multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_sp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+			RTE_RING_SYNC_ST, free_space);
+}
+
+#ifdef ALLOW_EXPERIMENTAL_API
+#include <rte_ring_elem.h>
+#endif
+
+/**
+ * Enqueue several objects on a ring.
+ *
+ * This function calls the multi-producer or the single-producer
+ * version depending on the default behavior that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
+		      unsigned int n, unsigned int *free_space)
+{
+	switch (r->prod.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mp_enqueue_bulk(r, obj_table, n, free_space);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sp_enqueue_bulk(r, obj_table, n, free_space);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mp_rts_enqueue_bulk(r, obj_table, n,
+			free_space);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mp_hts_enqueue_bulk(r, obj_table, n,
+			free_space);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	return 0;
+}
+
+/**
+ * Enqueue one object on a ring (multi-producers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * producer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj
+ *   A pointer to the object to be added.
+ * @return
+ *   - 0: Success; objects enqueued.
+ *   - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
+ */
+static __rte_always_inline int
+rte_ring_mp_enqueue(struct rte_ring *r, void *obj)
+{
+	return rte_ring_mp_enqueue_bulk(r, &obj, 1, NULL) ? 0 : -ENOBUFS;
+}
+
+/**
+ * Enqueue one object on a ring (NOT multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj
+ *   A pointer to the object to be added.
+ * @return
+ *   - 0: Success; objects enqueued.
+ *   - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
+ */
+static __rte_always_inline int
+rte_ring_sp_enqueue(struct rte_ring *r, void *obj)
+{
+	return rte_ring_sp_enqueue_bulk(r, &obj, 1, NULL) ? 0 : -ENOBUFS;
+}
+
+/**
+ * Enqueue one object on a ring.
+ *
+ * This function calls the multi-producer or the single-producer
+ * version, depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj
+ *   A pointer to the object to be added.
+ * @return
+ *   - 0: Success; objects enqueued.
+ *   - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
+ */
+static __rte_always_inline int
+rte_ring_enqueue(struct rte_ring *r, void *obj)
+{
+	return rte_ring_enqueue_bulk(r, &obj, 1, NULL) ? 0 : -ENOBUFS;
+}
+
+/**
+ * Dequeue several objects from a ring (multi-consumers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * consumer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_mc_dequeue_bulk(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+			RTE_RING_SYNC_MT, available);
+}
+
+/**
+ * Dequeue several objects from a ring (NOT multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table,
+ *   must be strictly positive.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_sc_dequeue_bulk(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+			RTE_RING_SYNC_ST, available);
+}
+
+/**
+ * Dequeue several objects from a ring.
+ *
+ * This function calls the multi-consumers or the single-consumer
+ * version, depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned int n,
+		unsigned int *available)
+{
+	switch (r->cons.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mc_dequeue_bulk(r, obj_table, n, available);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sc_dequeue_bulk(r, obj_table, n, available);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mc_rts_dequeue_bulk(r, obj_table, n, available);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mc_hts_dequeue_bulk(r, obj_table, n, available);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	return 0;
+}
+
+/**
+ * Dequeue one object from a ring (multi-consumers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * consumer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_p
+ *   A pointer to a void * pointer (object) that will be filled.
+ * @return
+ *   - 0: Success; objects dequeued.
+ *   - -ENOENT: Not enough entries in the ring to dequeue; no object is
+ *     dequeued.
+ */
+static __rte_always_inline int
+rte_ring_mc_dequeue(struct rte_ring *r, void **obj_p)
+{
+	return rte_ring_mc_dequeue_bulk(r, obj_p, 1, NULL)  ? 0 : -ENOENT;
+}
+
+/**
+ * Dequeue one object from a ring (NOT multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_p
+ *   A pointer to a void * pointer (object) that will be filled.
+ * @return
+ *   - 0: Success; objects dequeued.
+ *   - -ENOENT: Not enough entries in the ring to dequeue, no object is
+ *     dequeued.
+ */
+static __rte_always_inline int
+rte_ring_sc_dequeue(struct rte_ring *r, void **obj_p)
+{
+	return rte_ring_sc_dequeue_bulk(r, obj_p, 1, NULL) ? 0 : -ENOENT;
+}
+
+/**
+ * Dequeue one object from a ring.
+ *
+ * This function calls the multi-consumers or the single-consumer
+ * version depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_p
+ *   A pointer to a void * pointer (object) that will be filled.
+ * @return
+ *   - 0: Success, objects dequeued.
+ *   - -ENOENT: Not enough entries in the ring to dequeue, no object is
+ *     dequeued.
+ */
+static __rte_always_inline int
+rte_ring_dequeue(struct rte_ring *r, void **obj_p)
+{
+	return rte_ring_dequeue_bulk(r, obj_p, 1, NULL) ? 0 : -ENOENT;
+}
+
+/**
+ * Flush a ring.
+ *
+ * This function flush all the elements in a ring
+ *
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * @warning
+ * Make sure the ring is not in use while calling this function.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ */
+__rte_experimental
+void
+rte_ring_reset(struct rte_ring *r);
+
+/**
+ * Return the number of entries in a ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   The number of entries in the ring.
+ */
+static inline unsigned
+rte_ring_count(const struct rte_ring *r)
+{
+	uint32_t prod_tail = r->prod.tail;
+	uint32_t cons_tail = r->cons.tail;
+	uint32_t count = (prod_tail - cons_tail) & r->mask;
+	return (count > r->capacity) ? r->capacity : count;
+}
+
+/**
+ * Return the number of free entries in a ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   The number of free entries in the ring.
+ */
+static inline unsigned
+rte_ring_free_count(const struct rte_ring *r)
+{
+	return r->capacity - rte_ring_count(r);
+}
+
+/**
+ * Test if a ring is full.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   - 1: The ring is full.
+ *   - 0: The ring is not full.
+ */
+static inline int
+rte_ring_full(const struct rte_ring *r)
+{
+	return rte_ring_free_count(r) == 0;
+}
+
+/**
+ * Test if a ring is empty.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   - 1: The ring is empty.
+ *   - 0: The ring is not empty.
+ */
+static inline int
+rte_ring_empty(const struct rte_ring *r)
+{
+	return rte_ring_count(r) == 0;
+}
+
+/**
+ * Return the size of the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   The size of the data store used by the ring.
+ *   NOTE: this is not the same as the usable space in the ring. To query that
+ *   use ``rte_ring_get_capacity()``.
+ */
+static inline unsigned int
+rte_ring_get_size(const struct rte_ring *r)
+{
+	return r->size;
+}
+
+/**
+ * Return the number of elements which can be stored in the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   The usable size of the ring.
+ */
+static inline unsigned int
+rte_ring_get_capacity(const struct rte_ring *r)
+{
+	return r->capacity;
+}
+
+/**
+ * Return sync type used by producer in the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   Producer sync type value.
+ */
+static inline enum rte_ring_sync_type
+rte_ring_get_prod_sync_type(const struct rte_ring *r)
+{
+	return r->prod.sync_type;
+}
+
+/**
+ * Check is the ring for single producer.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   true if ring is SP, zero otherwise.
+ */
+static inline int
+rte_ring_is_prod_single(const struct rte_ring *r)
+{
+	return (rte_ring_get_prod_sync_type(r) == RTE_RING_SYNC_ST);
+}
+
+/**
+ * Return sync type used by consumer in the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   Consumer sync type value.
+ */
+static inline enum rte_ring_sync_type
+rte_ring_get_cons_sync_type(const struct rte_ring *r)
+{
+	return r->cons.sync_type;
+}
+
+/**
+ * Check is the ring for single consumer.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   true if ring is SC, zero otherwise.
+ */
+static inline int
+rte_ring_is_cons_single(const struct rte_ring *r)
+{
+	return (rte_ring_get_cons_sync_type(r) == RTE_RING_SYNC_ST);
+}
+
+/**
+ * Dump the status of all rings on the console
+ *
+ * @param f
+ *   A pointer to a file for output
+ */
+void rte_ring_list_dump(FILE *f);
+
+/**
+ * Search a ring from its name
+ *
+ * @param name
+ *   The name of the ring.
+ * @return
+ *   The pointer to the ring matching the name, or NULL if not found,
+ *   with rte_errno set appropriately. Possible rte_errno values include:
+ *    - ENOENT - required entry not available to return.
+ */
+struct rte_ring *rte_ring_lookup(const char *name);
+
+/**
+ * Enqueue several objects on the ring (multi-producers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * producer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+static __rte_always_inline unsigned
+rte_ring_mp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue(r, obj_table, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_MT, free_space);
+}
+
+/**
+ * Enqueue several objects on a ring (NOT multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+static __rte_always_inline unsigned
+rte_ring_sp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue(r, obj_table, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_ST, free_space);
+}
+
+/**
+ * Enqueue several objects on a ring.
+ *
+ * This function calls the multi-producer or the single-producer
+ * version depending on the default behavior that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+static __rte_always_inline unsigned
+rte_ring_enqueue_burst(struct rte_ring *r, void * const *obj_table,
+		      unsigned int n, unsigned int *free_space)
+{
+	switch (r->prod.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mp_enqueue_burst(r, obj_table, n, free_space);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sp_enqueue_burst(r, obj_table, n, free_space);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mp_rts_enqueue_burst(r, obj_table, n,
+			free_space);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mp_hts_enqueue_burst(r, obj_table, n,
+			free_space);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	return 0;
+}
+
+/**
+ * Dequeue several objects from a ring (multi-consumers safe). When the request
+ * objects are more than the available objects, only dequeue the actual number
+ * of objects
+ *
+ * This function uses a "compare and set" instruction to move the
+ * consumer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+static __rte_always_inline unsigned
+rte_ring_mc_dequeue_burst(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue(r, obj_table, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_MT, available);
+}
+
+/**
+ * Dequeue several objects from a ring (NOT multi-consumers safe).When the
+ * request objects are more than the available objects, only dequeue the
+ * actual number of objects
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+static __rte_always_inline unsigned
+rte_ring_sc_dequeue_burst(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue(r, obj_table, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_ST, available);
+}
+
+/**
+ * Dequeue multiple objects from a ring up to a maximum number.
+ *
+ * This function calls the multi-consumers or the single-consumer
+ * version, depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - Number of objects dequeued
+ */
+static __rte_always_inline unsigned
+rte_ring_dequeue_burst(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	switch (r->cons.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mc_dequeue_burst(r, obj_table, n, available);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sc_dequeue_burst(r, obj_table, n, available);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mc_rts_dequeue_burst(r, obj_table, n,
+			available);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mc_hts_dequeue_burst(r, obj_table, n,
+			available);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_RING_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_c11_mem.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_c11_mem.h
new file mode 100644
index 000000000..0fb73a337
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_c11_mem.h
@@ -0,0 +1,181 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2017,2018 HXT-semitech Corporation.
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_C11_MEM_H_
+#define _RTE_RING_C11_MEM_H_
+
+static __rte_always_inline void
+update_tail(struct rte_ring_headtail *ht, uint32_t old_val, uint32_t new_val,
+		uint32_t single, uint32_t enqueue)
+{
+	RTE_SET_USED(enqueue);
+
+	/*
+	 * If there are other enqueues/dequeues in progress that preceded us,
+	 * we need to wait for them to complete
+	 */
+	if (!single)
+		while (unlikely(ht->tail != old_val))
+			rte_pause();
+
+	__atomic_store_n(&ht->tail, new_val, __ATOMIC_RELEASE);
+}
+
+/**
+ * @internal This function updates the producer head for enqueue
+ *
+ * @param r
+ *   A pointer to the ring structure
+ * @param is_sp
+ *   Indicates whether multi-producer path is needed or not
+ * @param n
+ *   The number of elements we will want to enqueue, i.e. how far should the
+ *   head be moved
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Enqueue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param old_head
+ *   Returns head value as it was before the move, i.e. where enqueue starts
+ * @param new_head
+ *   Returns the current/new head value i.e. where enqueue finishes
+ * @param free_entries
+ *   Returns the amount of free space in the ring BEFORE head was moved
+ * @return
+ *   Actual number of objects enqueued.
+ *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_move_prod_head(struct rte_ring *r, unsigned int is_sp,
+		unsigned int n, enum rte_ring_queue_behavior behavior,
+		uint32_t *old_head, uint32_t *new_head,
+		uint32_t *free_entries)
+{
+	const uint32_t capacity = r->capacity;
+	uint32_t cons_tail;
+	unsigned int max = n;
+	int success;
+
+	*old_head = __atomic_load_n(&r->prod.head, __ATOMIC_RELAXED);
+	do {
+		/* Reset n to the initial burst count */
+		n = max;
+
+		/* Ensure the head is read before tail */
+		__atomic_thread_fence(__ATOMIC_ACQUIRE);
+
+		/* load-acquire synchronize with store-release of ht->tail
+		 * in update_tail.
+		 */
+		cons_tail = __atomic_load_n(&r->cons.tail,
+					__ATOMIC_ACQUIRE);
+
+		/* The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * *old_head > cons_tail). So 'free_entries' is always between 0
+		 * and capacity (which is < size).
+		 */
+		*free_entries = (capacity + cons_tail - *old_head);
+
+		/* check that we have enough room in ring */
+		if (unlikely(n > *free_entries))
+			n = (behavior == RTE_RING_QUEUE_FIXED) ?
+					0 : *free_entries;
+
+		if (n == 0)
+			return 0;
+
+		*new_head = *old_head + n;
+		if (is_sp)
+			r->prod.head = *new_head, success = 1;
+		else
+			/* on failure, *old_head is updated */
+			success = __atomic_compare_exchange_n(&r->prod.head,
+					old_head, *new_head,
+					0, __ATOMIC_RELAXED,
+					__ATOMIC_RELAXED);
+	} while (unlikely(success == 0));
+	return n;
+}
+
+/**
+ * @internal This function updates the consumer head for dequeue
+ *
+ * @param r
+ *   A pointer to the ring structure
+ * @param is_sc
+ *   Indicates whether multi-consumer path is needed or not
+ * @param n
+ *   The number of elements we will want to enqueue, i.e. how far should the
+ *   head be moved
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Dequeue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param old_head
+ *   Returns head value as it was before the move, i.e. where dequeue starts
+ * @param new_head
+ *   Returns the current/new head value i.e. where dequeue finishes
+ * @param entries
+ *   Returns the number of entries in the ring BEFORE head was moved
+ * @return
+ *   - Actual number of objects dequeued.
+ *     If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_move_cons_head(struct rte_ring *r, int is_sc,
+		unsigned int n, enum rte_ring_queue_behavior behavior,
+		uint32_t *old_head, uint32_t *new_head,
+		uint32_t *entries)
+{
+	unsigned int max = n;
+	uint32_t prod_tail;
+	int success;
+
+	/* move cons.head atomically */
+	*old_head = __atomic_load_n(&r->cons.head, __ATOMIC_RELAXED);
+	do {
+		/* Restore n as it may change every loop */
+		n = max;
+
+		/* Ensure the head is read before tail */
+		__atomic_thread_fence(__ATOMIC_ACQUIRE);
+
+		/* this load-acquire synchronize with store-release of ht->tail
+		 * in update_tail.
+		 */
+		prod_tail = __atomic_load_n(&r->prod.tail,
+					__ATOMIC_ACQUIRE);
+
+		/* The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * cons_head > prod_tail). So 'entries' is always between 0
+		 * and size(ring)-1.
+		 */
+		*entries = (prod_tail - *old_head);
+
+		/* Set the actual entries for dequeue */
+		if (n > *entries)
+			n = (behavior == RTE_RING_QUEUE_FIXED) ? 0 : *entries;
+
+		if (unlikely(n == 0))
+			return 0;
+
+		*new_head = *old_head + n;
+		if (is_sc)
+			r->cons.head = *new_head, success = 1;
+		else
+			/* on failure, *old_head will be updated */
+			success = __atomic_compare_exchange_n(&r->cons.head,
+							old_head, *new_head,
+							0, __ATOMIC_RELAXED,
+							__ATOMIC_RELAXED);
+	} while (unlikely(success == 0));
+	return n;
+}
+
+#endif /* _RTE_RING_C11_MEM_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_core.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_core.h
new file mode 100644
index 000000000..16718ca7f
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_core.h
@@ -0,0 +1,184 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_CORE_H_
+#define _RTE_RING_CORE_H_
+
+/**
+ * @file
+ * This file contains definion of RTE ring structure itself,
+ * init flags and some related macros.
+ * For majority of DPDK entities, it is not recommended to include
+ * this file directly, use include <rte_ring.h> or <rte_ring_elem.h>
+ * instead.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/queue.h>
+#include <errno.h>
+#include <rte_common.h>
+#include <rte_config.h>
+#include <rte_memory.h>
+#include <rte_lcore.h>
+#include <rte_atomic.h>
+#include <rte_branch_prediction.h>
+#include <rte_memzone.h>
+#include <rte_pause.h>
+#include <rte_debug.h>
+
+#define RTE_TAILQ_RING_NAME "RTE_RING"
+
+/** enqueue/dequeue behavior types */
+enum rte_ring_queue_behavior {
+	/** Enq/Deq a fixed number of items from a ring */
+	RTE_RING_QUEUE_FIXED = 0,
+	/** Enq/Deq as many items as possible from ring */
+	RTE_RING_QUEUE_VARIABLE
+};
+
+#define RTE_RING_MZ_PREFIX "RG_"
+/** The maximum length of a ring name. */
+#define RTE_RING_NAMESIZE (RTE_MEMZONE_NAMESIZE - \
+			   sizeof(RTE_RING_MZ_PREFIX) + 1)
+
+/** prod/cons sync types */
+enum rte_ring_sync_type {
+	RTE_RING_SYNC_MT,     /**< multi-thread safe (default mode) */
+	RTE_RING_SYNC_ST,     /**< single thread only */
+#ifdef ALLOW_EXPERIMENTAL_API
+	RTE_RING_SYNC_MT_RTS, /**< multi-thread relaxed tail sync */
+	RTE_RING_SYNC_MT_HTS, /**< multi-thread head/tail sync */
+#endif
+};
+
+/**
+ * structures to hold a pair of head/tail values and other metadata.
+ * Depending on sync_type format of that structure might be different,
+ * but offset for *sync_type* and *tail* values should remain the same.
+ */
+struct rte_ring_headtail {
+	volatile uint32_t head;      /**< prod/consumer head. */
+	volatile uint32_t tail;      /**< prod/consumer tail. */
+	RTE_STD_C11
+	union {
+		/** sync type of prod/cons */
+		enum rte_ring_sync_type sync_type;
+		/** deprecated -  True if single prod/cons */
+		uint32_t single;
+	};
+};
+
+union __rte_ring_rts_poscnt {
+	/** raw 8B value to read/write *cnt* and *pos* as one atomic op */
+	uint64_t raw __rte_aligned(8);
+	struct {
+		uint32_t cnt; /**< head/tail reference counter */
+		uint32_t pos; /**< head/tail position */
+	} val;
+};
+
+struct rte_ring_rts_headtail {
+	volatile union __rte_ring_rts_poscnt tail;
+	enum rte_ring_sync_type sync_type;  /**< sync type of prod/cons */
+	uint32_t htd_max;   /**< max allowed distance between head/tail */
+	volatile union __rte_ring_rts_poscnt head;
+};
+
+union __rte_ring_hts_pos {
+	/** raw 8B value to read/write *head* and *tail* as one atomic op */
+	uint64_t raw __rte_aligned(8);
+	struct {
+		uint32_t head; /**< head position */
+		uint32_t tail; /**< tail position */
+	} pos;
+};
+
+struct rte_ring_hts_headtail {
+	volatile union __rte_ring_hts_pos ht;
+	enum rte_ring_sync_type sync_type;  /**< sync type of prod/cons */
+};
+
+/**
+ * An RTE ring structure.
+ *
+ * The producer and the consumer have a head and a tail index. The particularity
+ * of these index is that they are not between 0 and size(ring). These indexes
+ * are between 0 and 2^32, and we mask their value when we access the ring[]
+ * field. Thanks to this assumption, we can do subtractions between 2 index
+ * values in a modulo-32bit base: that's why the overflow of the indexes is not
+ * a problem.
+ */
+struct rte_ring {
+	/*
+	 * Note: this field kept the RTE_MEMZONE_NAMESIZE size due to ABI
+	 * compatibility requirements, it could be changed to RTE_RING_NAMESIZE
+	 * next time the ABI changes
+	 */
+	char name[RTE_MEMZONE_NAMESIZE] __rte_cache_aligned;
+	/**< Name of the ring. */
+	int flags;               /**< Flags supplied at creation. */
+	const struct rte_memzone *memzone;
+			/**< Memzone, if any, containing the rte_ring */
+	uint32_t size;           /**< Size of ring. */
+	uint32_t mask;           /**< Mask (size-1) of ring. */
+	uint32_t capacity;       /**< Usable size of ring */
+
+	char pad0 __rte_cache_aligned; /**< empty cache line */
+
+	/** Ring producer status. */
+	RTE_STD_C11
+	union {
+		struct rte_ring_headtail prod;
+		struct rte_ring_hts_headtail hts_prod;
+		struct rte_ring_rts_headtail rts_prod;
+	}  __rte_cache_aligned;
+
+	char pad1 __rte_cache_aligned; /**< empty cache line */
+
+	/** Ring consumer status. */
+	RTE_STD_C11
+	union {
+		struct rte_ring_headtail cons;
+		struct rte_ring_hts_headtail hts_cons;
+		struct rte_ring_rts_headtail rts_cons;
+	}  __rte_cache_aligned;
+
+	char pad2 __rte_cache_aligned; /**< empty cache line */
+};
+
+#define RING_F_SP_ENQ 0x0001 /**< The default enqueue is "single-producer". */
+#define RING_F_SC_DEQ 0x0002 /**< The default dequeue is "single-consumer". */
+/**
+ * Ring is to hold exactly requested number of entries.
+ * Without this flag set, the ring size requested must be a power of 2, and the
+ * usable space will be that size - 1. With the flag, the requested size will
+ * be rounded up to the next power of two, but the usable space will be exactly
+ * that requested. Worst case, if a power-of-2 size is requested, half the
+ * ring space will be wasted.
+ */
+#define RING_F_EXACT_SZ 0x0004
+#define RTE_RING_SZ_MASK  (0x7fffffffU) /**< Ring size mask */
+
+#define RING_F_MP_RTS_ENQ 0x0008 /**< The default enqueue is "MP RTS". */
+#define RING_F_MC_RTS_DEQ 0x0010 /**< The default dequeue is "MC RTS". */
+
+#define RING_F_MP_HTS_ENQ 0x0020 /**< The default enqueue is "MP HTS". */
+#define RING_F_MC_HTS_DEQ 0x0040 /**< The default dequeue is "MC HTS". */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_RING_CORE_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_elem.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_elem.h
new file mode 100644
index 000000000..a5a4c46f9
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_elem.h
@@ -0,0 +1,1102 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2019 Arm Limited
+ * Copyright (c) 2010-2017 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_ELEM_H_
+#define _RTE_RING_ELEM_H_
+
+/**
+ * @file
+ * RTE Ring with user defined element size
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_ring_core.h>
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Calculate the memory size needed for a ring with given element size
+ *
+ * This function returns the number of bytes needed for a ring, given
+ * the number of elements in it and the size of the element. This value
+ * is the sum of the size of the structure rte_ring and the size of the
+ * memory needed for storing the elements. The value is aligned to a cache
+ * line size.
+ *
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ * @param count
+ *   The number of elements in the ring (must be a power of 2).
+ * @return
+ *   - The memory size needed for the ring on success.
+ *   - -EINVAL - esize is not a multiple of 4 or count provided is not a
+ *		 power of 2.
+ */
+__rte_experimental
+ssize_t rte_ring_get_memsize_elem(unsigned int esize, unsigned int count);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Create a new ring named *name* that stores elements with given size.
+ *
+ * This function uses ``memzone_reserve()`` to allocate memory. Then it
+ * calls rte_ring_init() to initialize an empty ring.
+ *
+ * The new ring size is set to *count*, which must be a power of
+ * two. Water marking is disabled by default. The real usable ring size
+ * is *count-1* instead of *count* to differentiate a free ring from an
+ * empty ring.
+ *
+ * The ring is added in RTE_TAILQ_RING list.
+ *
+ * @param name
+ *   The name of the ring.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ * @param count
+ *   The number of elements in the ring (must be a power of 2).
+ * @param socket_id
+ *   The *socket_id* argument is the socket identifier in case of
+ *   NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
+ *   constraint for the reserved zone.
+ * @param flags
+ *   An OR of the following:
+ *   - One of mutually exclusive flags that define producer behavior:
+ *      - RING_F_SP_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "single-producer".
+ *      - RING_F_MP_RTS_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "multi-producer RTS mode".
+ *      - RING_F_MP_HTS_ENQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ *        is "multi-producer HTS mode".
+ *     If none of these flags is set, then default "multi-producer"
+ *     behavior is selected.
+ *   - One of mutually exclusive flags that define consumer behavior:
+ *      - RING_F_SC_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "single-consumer". Otherwise, it is "multi-consumers".
+ *      - RING_F_MC_RTS_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "multi-consumer RTS mode".
+ *      - RING_F_MC_HTS_DEQ: If this flag is set, the default behavior when
+ *        using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ *        is "multi-consumer HTS mode".
+ *     If none of these flags is set, then default "multi-consumer"
+ *     behavior is selected.
+ * @return
+ *   On success, the pointer to the new allocated ring. NULL on error with
+ *    rte_errno set appropriately. Possible errno values include:
+ *    - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
+ *    - E_RTE_SECONDARY - function was called from a secondary process instance
+ *    - EINVAL - esize is not a multiple of 4 or count provided is not a
+ *		 power of 2.
+ *    - ENOSPC - the maximum number of memzones has already been allocated
+ *    - EEXIST - a memzone with the same name already exists
+ *    - ENOMEM - no appropriate memory area found in which to create memzone
+ */
+__rte_experimental
+struct rte_ring *rte_ring_create_elem(const char *name, unsigned int esize,
+			unsigned int count, int socket_id, unsigned int flags);
+
+static __rte_always_inline void
+__rte_ring_enqueue_elems_32(struct rte_ring *r, const uint32_t size,
+		uint32_t idx, const void *obj_table, uint32_t n)
+{
+	unsigned int i;
+	uint32_t *ring = (uint32_t *)&r[1];
+	const uint32_t *obj = (const uint32_t *)obj_table;
+	if (likely(idx + n < size)) {
+		for (i = 0; i < (n & ~0x7); i += 8, idx += 8) {
+			ring[idx] = obj[i];
+			ring[idx + 1] = obj[i + 1];
+			ring[idx + 2] = obj[i + 2];
+			ring[idx + 3] = obj[i + 3];
+			ring[idx + 4] = obj[i + 4];
+			ring[idx + 5] = obj[i + 5];
+			ring[idx + 6] = obj[i + 6];
+			ring[idx + 7] = obj[i + 7];
+		}
+		switch (n & 0x7) {
+		case 7:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 6:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 5:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 4:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 3:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 2:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 1:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		}
+	} else {
+		for (i = 0; idx < size; i++, idx++)
+			ring[idx] = obj[i];
+		/* Start at the beginning */
+		for (idx = 0; i < n; i++, idx++)
+			ring[idx] = obj[i];
+	}
+}
+
+static __rte_always_inline void
+__rte_ring_enqueue_elems_64(struct rte_ring *r, uint32_t prod_head,
+		const void *obj_table, uint32_t n)
+{
+	unsigned int i;
+	const uint32_t size = r->size;
+	uint32_t idx = prod_head & r->mask;
+	uint64_t *ring = (uint64_t *)&r[1];
+	const unaligned_uint64_t *obj = (const unaligned_uint64_t *)obj_table;
+	if (likely(idx + n < size)) {
+		for (i = 0; i < (n & ~0x3); i += 4, idx += 4) {
+			ring[idx] = obj[i];
+			ring[idx + 1] = obj[i + 1];
+			ring[idx + 2] = obj[i + 2];
+			ring[idx + 3] = obj[i + 3];
+		}
+		switch (n & 0x3) {
+		case 3:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 2:
+			ring[idx++] = obj[i++]; /* fallthrough */
+		case 1:
+			ring[idx++] = obj[i++];
+		}
+	} else {
+		for (i = 0; idx < size; i++, idx++)
+			ring[idx] = obj[i];
+		/* Start at the beginning */
+		for (idx = 0; i < n; i++, idx++)
+			ring[idx] = obj[i];
+	}
+}
+
+static __rte_always_inline void
+__rte_ring_enqueue_elems_128(struct rte_ring *r, uint32_t prod_head,
+		const void *obj_table, uint32_t n)
+{
+	unsigned int i;
+	const uint32_t size = r->size;
+	uint32_t idx = prod_head & r->mask;
+	rte_int128_t *ring = (rte_int128_t *)&r[1];
+	const rte_int128_t *obj = (const rte_int128_t *)obj_table;
+	if (likely(idx + n < size)) {
+		for (i = 0; i < (n & ~0x1); i += 2, idx += 2)
+			memcpy((void *)(ring + idx),
+				(const void *)(obj + i), 32);
+		switch (n & 0x1) {
+		case 1:
+			memcpy((void *)(ring + idx),
+				(const void *)(obj + i), 16);
+		}
+	} else {
+		for (i = 0; idx < size; i++, idx++)
+			memcpy((void *)(ring + idx),
+				(const void *)(obj + i), 16);
+		/* Start at the beginning */
+		for (idx = 0; i < n; i++, idx++)
+			memcpy((void *)(ring + idx),
+				(const void *)(obj + i), 16);
+	}
+}
+
+/* the actual enqueue of elements on the ring.
+ * Placed here since identical code needed in both
+ * single and multi producer enqueue functions.
+ */
+static __rte_always_inline void
+__rte_ring_enqueue_elems(struct rte_ring *r, uint32_t prod_head,
+		const void *obj_table, uint32_t esize, uint32_t num)
+{
+	/* 8B and 16B copies implemented individually to retain
+	 * the current performance.
+	 */
+	if (esize == 8)
+		__rte_ring_enqueue_elems_64(r, prod_head, obj_table, num);
+	else if (esize == 16)
+		__rte_ring_enqueue_elems_128(r, prod_head, obj_table, num);
+	else {
+		uint32_t idx, scale, nr_idx, nr_num, nr_size;
+
+		/* Normalize to uint32_t */
+		scale = esize / sizeof(uint32_t);
+		nr_num = num * scale;
+		idx = prod_head & r->mask;
+		nr_idx = idx * scale;
+		nr_size = r->size * scale;
+		__rte_ring_enqueue_elems_32(r, nr_size, nr_idx,
+				obj_table, nr_num);
+	}
+}
+
+static __rte_always_inline void
+__rte_ring_dequeue_elems_32(struct rte_ring *r, const uint32_t size,
+		uint32_t idx, void *obj_table, uint32_t n)
+{
+	unsigned int i;
+	uint32_t *ring = (uint32_t *)&r[1];
+	uint32_t *obj = (uint32_t *)obj_table;
+	if (likely(idx + n < size)) {
+		for (i = 0; i < (n & ~0x7); i += 8, idx += 8) {
+			obj[i] = ring[idx];
+			obj[i + 1] = ring[idx + 1];
+			obj[i + 2] = ring[idx + 2];
+			obj[i + 3] = ring[idx + 3];
+			obj[i + 4] = ring[idx + 4];
+			obj[i + 5] = ring[idx + 5];
+			obj[i + 6] = ring[idx + 6];
+			obj[i + 7] = ring[idx + 7];
+		}
+		switch (n & 0x7) {
+		case 7:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 6:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 5:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 4:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 3:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 2:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 1:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		}
+	} else {
+		for (i = 0; idx < size; i++, idx++)
+			obj[i] = ring[idx];
+		/* Start at the beginning */
+		for (idx = 0; i < n; i++, idx++)
+			obj[i] = ring[idx];
+	}
+}
+
+static __rte_always_inline void
+__rte_ring_dequeue_elems_64(struct rte_ring *r, uint32_t prod_head,
+		void *obj_table, uint32_t n)
+{
+	unsigned int i;
+	const uint32_t size = r->size;
+	uint32_t idx = prod_head & r->mask;
+	uint64_t *ring = (uint64_t *)&r[1];
+	unaligned_uint64_t *obj = (unaligned_uint64_t *)obj_table;
+	if (likely(idx + n < size)) {
+		for (i = 0; i < (n & ~0x3); i += 4, idx += 4) {
+			obj[i] = ring[idx];
+			obj[i + 1] = ring[idx + 1];
+			obj[i + 2] = ring[idx + 2];
+			obj[i + 3] = ring[idx + 3];
+		}
+		switch (n & 0x3) {
+		case 3:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 2:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		case 1:
+			obj[i++] = ring[idx++]; /* fallthrough */
+		}
+	} else {
+		for (i = 0; idx < size; i++, idx++)
+			obj[i] = ring[idx];
+		/* Start at the beginning */
+		for (idx = 0; i < n; i++, idx++)
+			obj[i] = ring[idx];
+	}
+}
+
+static __rte_always_inline void
+__rte_ring_dequeue_elems_128(struct rte_ring *r, uint32_t prod_head,
+		void *obj_table, uint32_t n)
+{
+	unsigned int i;
+	const uint32_t size = r->size;
+	uint32_t idx = prod_head & r->mask;
+	rte_int128_t *ring = (rte_int128_t *)&r[1];
+	rte_int128_t *obj = (rte_int128_t *)obj_table;
+	if (likely(idx + n < size)) {
+		for (i = 0; i < (n & ~0x1); i += 2, idx += 2)
+			memcpy((void *)(obj + i), (void *)(ring + idx), 32);
+		switch (n & 0x1) {
+		case 1:
+			memcpy((void *)(obj + i), (void *)(ring + idx), 16);
+		}
+	} else {
+		for (i = 0; idx < size; i++, idx++)
+			memcpy((void *)(obj + i), (void *)(ring + idx), 16);
+		/* Start at the beginning */
+		for (idx = 0; i < n; i++, idx++)
+			memcpy((void *)(obj + i), (void *)(ring + idx), 16);
+	}
+}
+
+/* the actual dequeue of elements from the ring.
+ * Placed here since identical code needed in both
+ * single and multi producer enqueue functions.
+ */
+static __rte_always_inline void
+__rte_ring_dequeue_elems(struct rte_ring *r, uint32_t cons_head,
+		void *obj_table, uint32_t esize, uint32_t num)
+{
+	/* 8B and 16B copies implemented individually to retain
+	 * the current performance.
+	 */
+	if (esize == 8)
+		__rte_ring_dequeue_elems_64(r, cons_head, obj_table, num);
+	else if (esize == 16)
+		__rte_ring_dequeue_elems_128(r, cons_head, obj_table, num);
+	else {
+		uint32_t idx, scale, nr_idx, nr_num, nr_size;
+
+		/* Normalize to uint32_t */
+		scale = esize / sizeof(uint32_t);
+		nr_num = num * scale;
+		idx = cons_head & r->mask;
+		nr_idx = idx * scale;
+		nr_size = r->size * scale;
+		__rte_ring_dequeue_elems_32(r, nr_size, nr_idx,
+				obj_table, nr_num);
+	}
+}
+
+/* Between load and load. there might be cpu reorder in weak model
+ * (powerpc/arm).
+ * There are 2 choices for the users
+ * 1.use rmb() memory barrier
+ * 2.use one-direction load_acquire/store_release barrier,defined by
+ * CONFIG_RTE_USE_C11_MEM_MODEL=y
+ * It depends on performance test results.
+ * By default, move common functions to rte_ring_generic.h
+ */
+#ifdef RTE_USE_C11_MEM_MODEL
+#include "rte_ring_c11_mem.h"
+#else
+#include "rte_ring_generic.h"
+#endif
+
+/**
+ * @internal Enqueue several objects on the ring
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Enqueue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param is_sp
+ *   Indicates whether to use single producer or multi-producer head update
+ * @param free_space
+ *   returns the amount of space after the enqueue operation has finished
+ * @return
+ *   Actual number of objects enqueued.
+ *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_enqueue_elem(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n,
+		enum rte_ring_queue_behavior behavior, unsigned int is_sp,
+		unsigned int *free_space)
+{
+	uint32_t prod_head, prod_next;
+	uint32_t free_entries;
+
+	n = __rte_ring_move_prod_head(r, is_sp, n, behavior,
+			&prod_head, &prod_next, &free_entries);
+	if (n == 0)
+		goto end;
+
+	__rte_ring_enqueue_elems(r, prod_head, obj_table, esize, n);
+
+	update_tail(&r->prod, prod_head, prod_next, is_sp, 1);
+end:
+	if (free_space != NULL)
+		*free_space = free_entries - n;
+	return n;
+}
+
+/**
+ * @internal Dequeue several objects from the ring
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to pull from the ring.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Dequeue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param is_sc
+ *   Indicates whether to use single consumer or multi-consumer head update
+ * @param available
+ *   returns the number of remaining ring entries after the dequeue has finished
+ * @return
+ *   - Actual number of objects dequeued.
+ *     If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_dequeue_elem(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n,
+		enum rte_ring_queue_behavior behavior, unsigned int is_sc,
+		unsigned int *available)
+{
+	uint32_t cons_head, cons_next;
+	uint32_t entries;
+
+	n = __rte_ring_move_cons_head(r, (int)is_sc, n, behavior,
+			&cons_head, &cons_next, &entries);
+	if (n == 0)
+		goto end;
+
+	__rte_ring_dequeue_elems(r, cons_head, obj_table, esize, n);
+
+	update_tail(&r->cons, cons_head, cons_next, is_sc, 0);
+
+end:
+	if (available != NULL)
+		*available = entries - n;
+	return n;
+}
+
+/**
+ * Enqueue several objects on the ring (multi-producers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * producer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_mp_enqueue_bulk_elem(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, RTE_RING_SYNC_MT, free_space);
+}
+
+/**
+ * Enqueue several objects on a ring
+ *
+ * @warning This API is NOT multi-producers safe
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_sp_enqueue_bulk_elem(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, RTE_RING_SYNC_ST, free_space);
+}
+
+#ifdef ALLOW_EXPERIMENTAL_API
+#include <rte_ring_hts.h>
+#include <rte_ring_rts.h>
+#endif
+
+/**
+ * Enqueue several objects on a ring.
+ *
+ * This function calls the multi-producer or the single-producer
+ * version depending on the default behavior that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_enqueue_bulk_elem(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, r->prod.sync_type, free_space);
+
+	switch (r->prod.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mp_enqueue_bulk_elem(r, obj_table, esize, n,
+			free_space);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sp_enqueue_bulk_elem(r, obj_table, esize, n,
+			free_space);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mp_rts_enqueue_bulk_elem(r, obj_table, esize, n,
+			free_space);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mp_hts_enqueue_bulk_elem(r, obj_table, esize, n,
+			free_space);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	if (free_space != NULL)
+		*free_space = 0;
+	return 0;
+}
+
+/**
+ * Enqueue one object on a ring (multi-producers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * producer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj
+ *   A pointer to the object to be added.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @return
+ *   - 0: Success; objects enqueued.
+ *   - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
+ */
+static __rte_always_inline int
+rte_ring_mp_enqueue_elem(struct rte_ring *r, void *obj, unsigned int esize)
+{
+	return rte_ring_mp_enqueue_bulk_elem(r, obj, esize, 1, NULL) ? 0 :
+								-ENOBUFS;
+}
+
+/**
+ * Enqueue one object on a ring
+ *
+ * @warning This API is NOT multi-producers safe
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj
+ *   A pointer to the object to be added.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @return
+ *   - 0: Success; objects enqueued.
+ *   - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
+ */
+static __rte_always_inline int
+rte_ring_sp_enqueue_elem(struct rte_ring *r, void *obj, unsigned int esize)
+{
+	return rte_ring_sp_enqueue_bulk_elem(r, obj, esize, 1, NULL) ? 0 :
+								-ENOBUFS;
+}
+
+/**
+ * Enqueue one object on a ring.
+ *
+ * This function calls the multi-producer or the single-producer
+ * version, depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj
+ *   A pointer to the object to be added.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @return
+ *   - 0: Success; objects enqueued.
+ *   - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
+ */
+static __rte_always_inline int
+rte_ring_enqueue_elem(struct rte_ring *r, void *obj, unsigned int esize)
+{
+	return rte_ring_enqueue_bulk_elem(r, obj, esize, 1, NULL) ? 0 :
+								-ENOBUFS;
+}
+
+/**
+ * Dequeue several objects from a ring (multi-consumers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * consumer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_mc_dequeue_bulk_elem(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, RTE_RING_SYNC_MT, available);
+}
+
+/**
+ * Dequeue several objects from a ring (NOT multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table,
+ *   must be strictly positive.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_sc_dequeue_bulk_elem(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, RTE_RING_SYNC_ST, available);
+}
+
+/**
+ * Dequeue several objects from a ring.
+ *
+ * This function calls the multi-consumers or the single-consumer
+ * version, depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+static __rte_always_inline unsigned int
+rte_ring_dequeue_bulk_elem(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	switch (r->cons.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mc_dequeue_bulk_elem(r, obj_table, esize, n,
+			available);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sc_dequeue_bulk_elem(r, obj_table, esize, n,
+			available);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mc_rts_dequeue_bulk_elem(r, obj_table, esize,
+			n, available);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mc_hts_dequeue_bulk_elem(r, obj_table, esize,
+			n, available);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	if (available != NULL)
+		*available = 0;
+	return 0;
+}
+
+/**
+ * Dequeue one object from a ring (multi-consumers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * consumer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_p
+ *   A pointer to the object that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @return
+ *   - 0: Success; objects dequeued.
+ *   - -ENOENT: Not enough entries in the ring to dequeue; no object is
+ *     dequeued.
+ */
+static __rte_always_inline int
+rte_ring_mc_dequeue_elem(struct rte_ring *r, void *obj_p,
+				unsigned int esize)
+{
+	return rte_ring_mc_dequeue_bulk_elem(r, obj_p, esize, 1, NULL)  ? 0 :
+								-ENOENT;
+}
+
+/**
+ * Dequeue one object from a ring (NOT multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_p
+ *   A pointer to the object that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @return
+ *   - 0: Success; objects dequeued.
+ *   - -ENOENT: Not enough entries in the ring to dequeue, no object is
+ *     dequeued.
+ */
+static __rte_always_inline int
+rte_ring_sc_dequeue_elem(struct rte_ring *r, void *obj_p,
+				unsigned int esize)
+{
+	return rte_ring_sc_dequeue_bulk_elem(r, obj_p, esize, 1, NULL) ? 0 :
+								-ENOENT;
+}
+
+/**
+ * Dequeue one object from a ring.
+ *
+ * This function calls the multi-consumers or the single-consumer
+ * version depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_p
+ *   A pointer to the object that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @return
+ *   - 0: Success, objects dequeued.
+ *   - -ENOENT: Not enough entries in the ring to dequeue, no object is
+ *     dequeued.
+ */
+static __rte_always_inline int
+rte_ring_dequeue_elem(struct rte_ring *r, void *obj_p, unsigned int esize)
+{
+	return rte_ring_dequeue_bulk_elem(r, obj_p, esize, 1, NULL) ? 0 :
+								-ENOENT;
+}
+
+/**
+ * Enqueue several objects on the ring (multi-producers safe).
+ *
+ * This function uses a "compare and set" instruction to move the
+ * producer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+static __rte_always_inline unsigned
+rte_ring_mp_enqueue_burst_elem(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_MT, free_space);
+}
+
+/**
+ * Enqueue several objects on a ring
+ *
+ * @warning This API is NOT multi-producers safe
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+static __rte_always_inline unsigned
+rte_ring_sp_enqueue_burst_elem(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_ST, free_space);
+}
+
+/**
+ * Enqueue several objects on a ring.
+ *
+ * This function calls the multi-producer or the single-producer
+ * version depending on the default behavior that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+static __rte_always_inline unsigned
+rte_ring_enqueue_burst_elem(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	switch (r->prod.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mp_enqueue_burst_elem(r, obj_table, esize, n,
+			free_space);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sp_enqueue_burst_elem(r, obj_table, esize, n,
+			free_space);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mp_rts_enqueue_burst_elem(r, obj_table, esize,
+			n, free_space);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mp_hts_enqueue_burst_elem(r, obj_table, esize,
+			n, free_space);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	if (free_space != NULL)
+		*free_space = 0;
+	return 0;
+}
+
+/**
+ * Dequeue several objects from a ring (multi-consumers safe). When the request
+ * objects are more than the available objects, only dequeue the actual number
+ * of objects
+ *
+ * This function uses a "compare and set" instruction to move the
+ * consumer index atomically.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+static __rte_always_inline unsigned
+rte_ring_mc_dequeue_burst_elem(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_MT, available);
+}
+
+/**
+ * Dequeue several objects from a ring (NOT multi-consumers safe).When the
+ * request objects are more than the available objects, only dequeue the
+ * actual number of objects
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+static __rte_always_inline unsigned
+rte_ring_sc_dequeue_burst_elem(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, RTE_RING_SYNC_ST, available);
+}
+
+/**
+ * Dequeue multiple objects from a ring up to a maximum number.
+ *
+ * This function calls the multi-consumers or the single-consumer
+ * version, depending on the default behaviour that was specified at
+ * ring creation time (see flags).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - Number of objects dequeued
+ */
+static __rte_always_inline unsigned int
+rte_ring_dequeue_burst_elem(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	switch (r->cons.sync_type) {
+	case RTE_RING_SYNC_MT:
+		return rte_ring_mc_dequeue_burst_elem(r, obj_table, esize, n,
+			available);
+	case RTE_RING_SYNC_ST:
+		return rte_ring_sc_dequeue_burst_elem(r, obj_table, esize, n,
+			available);
+#ifdef ALLOW_EXPERIMENTAL_API
+	case RTE_RING_SYNC_MT_RTS:
+		return rte_ring_mc_rts_dequeue_burst_elem(r, obj_table, esize,
+			n, available);
+	case RTE_RING_SYNC_MT_HTS:
+		return rte_ring_mc_hts_dequeue_burst_elem(r, obj_table, esize,
+			n, available);
+#endif
+	}
+
+	/* valid ring should never reach this point */
+	RTE_ASSERT(0);
+	if (available != NULL)
+		*available = 0;
+	return 0;
+}
+
+#ifdef ALLOW_EXPERIMENTAL_API
+#include <rte_ring_peek.h>
+#endif
+
+#include <rte_ring.h>
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_RING_ELEM_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_generic.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_generic.h
new file mode 100644
index 000000000..953cdbbd5
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_generic.h
@@ -0,0 +1,173 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2017 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_GENERIC_H_
+#define _RTE_RING_GENERIC_H_
+
+static __rte_always_inline void
+update_tail(struct rte_ring_headtail *ht, uint32_t old_val, uint32_t new_val,
+		uint32_t single, uint32_t enqueue)
+{
+	if (enqueue)
+		rte_smp_wmb();
+	else
+		rte_smp_rmb();
+	/*
+	 * If there are other enqueues/dequeues in progress that preceded us,
+	 * we need to wait for them to complete
+	 */
+	if (!single)
+		while (unlikely(ht->tail != old_val))
+			rte_pause();
+
+	ht->tail = new_val;
+}
+
+/**
+ * @internal This function updates the producer head for enqueue
+ *
+ * @param r
+ *   A pointer to the ring structure
+ * @param is_sp
+ *   Indicates whether multi-producer path is needed or not
+ * @param n
+ *   The number of elements we will want to enqueue, i.e. how far should the
+ *   head be moved
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Enqueue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param old_head
+ *   Returns head value as it was before the move, i.e. where enqueue starts
+ * @param new_head
+ *   Returns the current/new head value i.e. where enqueue finishes
+ * @param free_entries
+ *   Returns the amount of free space in the ring BEFORE head was moved
+ * @return
+ *   Actual number of objects enqueued.
+ *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_move_prod_head(struct rte_ring *r, unsigned int is_sp,
+		unsigned int n, enum rte_ring_queue_behavior behavior,
+		uint32_t *old_head, uint32_t *new_head,
+		uint32_t *free_entries)
+{
+	const uint32_t capacity = r->capacity;
+	unsigned int max = n;
+	int success;
+
+	do {
+		/* Reset n to the initial burst count */
+		n = max;
+
+		*old_head = r->prod.head;
+
+		/* add rmb barrier to avoid load/load reorder in weak
+		 * memory model. It is noop on x86
+		 */
+		rte_smp_rmb();
+
+		/*
+		 *  The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * *old_head > cons_tail). So 'free_entries' is always between 0
+		 * and capacity (which is < size).
+		 */
+		*free_entries = (capacity + r->cons.tail - *old_head);
+
+		/* check that we have enough room in ring */
+		if (unlikely(n > *free_entries))
+			n = (behavior == RTE_RING_QUEUE_FIXED) ?
+					0 : *free_entries;
+
+		if (n == 0)
+			return 0;
+
+		*new_head = *old_head + n;
+		if (is_sp)
+			r->prod.head = *new_head, success = 1;
+		else
+			success = rte_atomic32_cmpset(&r->prod.head,
+					*old_head, *new_head);
+	} while (unlikely(success == 0));
+	return n;
+}
+
+/**
+ * @internal This function updates the consumer head for dequeue
+ *
+ * @param r
+ *   A pointer to the ring structure
+ * @param is_sc
+ *   Indicates whether multi-consumer path is needed or not
+ * @param n
+ *   The number of elements we will want to enqueue, i.e. how far should the
+ *   head be moved
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Dequeue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param old_head
+ *   Returns head value as it was before the move, i.e. where dequeue starts
+ * @param new_head
+ *   Returns the current/new head value i.e. where dequeue finishes
+ * @param entries
+ *   Returns the number of entries in the ring BEFORE head was moved
+ * @return
+ *   - Actual number of objects dequeued.
+ *     If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_move_cons_head(struct rte_ring *r, unsigned int is_sc,
+		unsigned int n, enum rte_ring_queue_behavior behavior,
+		uint32_t *old_head, uint32_t *new_head,
+		uint32_t *entries)
+{
+	unsigned int max = n;
+	int success;
+
+	/* move cons.head atomically */
+	do {
+		/* Restore n as it may change every loop */
+		n = max;
+
+		*old_head = r->cons.head;
+
+		/* add rmb barrier to avoid load/load reorder in weak
+		 * memory model. It is noop on x86
+		 */
+		rte_smp_rmb();
+
+		/* The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * cons_head > prod_tail). So 'entries' is always between 0
+		 * and size(ring)-1.
+		 */
+		*entries = (r->prod.tail - *old_head);
+
+		/* Set the actual entries for dequeue */
+		if (n > *entries)
+			n = (behavior == RTE_RING_QUEUE_FIXED) ? 0 : *entries;
+
+		if (unlikely(n == 0))
+			return 0;
+
+		*new_head = *old_head + n;
+		if (is_sc) {
+			r->cons.head = *new_head;
+			rte_smp_rmb();
+			success = 1;
+		} else {
+			success = rte_atomic32_cmpset(&r->cons.head, *old_head,
+					*new_head);
+		}
+	} while (unlikely(success == 0));
+	return n;
+}
+
+#endif /* _RTE_RING_GENERIC_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_hts.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_hts.h
new file mode 100644
index 000000000..c7701defc
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_hts.h
@@ -0,0 +1,332 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_HTS_H_
+#define _RTE_RING_HTS_H_
+
+/**
+ * @file rte_ring_hts.h
+ * @b EXPERIMENTAL: this API may change without prior notice
+ * It is not recommended to include this file directly.
+ * Please include <rte_ring.h> instead.
+ *
+ * Contains functions for serialized, aka Head-Tail Sync (HTS) ring mode.
+ * In that mode enqueue/dequeue operation is fully serialized:
+ * at any given moment only one enqueue/dequeue operation can proceed.
+ * This is achieved by allowing a thread to proceed with changing head.value
+ * only when head.value == tail.value.
+ * Both head and tail values are updated atomically (as one 64-bit value).
+ * To achieve that 64-bit CAS is used by head update routine.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_ring_hts_c11_mem.h>
+
+/**
+ * @internal Enqueue several objects on the HTS ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Enqueue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param free_space
+ *   returns the amount of space after the enqueue operation has finished
+ * @return
+ *   Actual number of objects enqueued.
+ *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_hts_enqueue_elem(struct rte_ring *r, const void *obj_table,
+	uint32_t esize, uint32_t n, enum rte_ring_queue_behavior behavior,
+	uint32_t *free_space)
+{
+	uint32_t free, head;
+
+	n =  __rte_ring_hts_move_prod_head(r, n, behavior, &head, &free);
+
+	if (n != 0) {
+		__rte_ring_enqueue_elems(r, head, obj_table, esize, n);
+		__rte_ring_hts_update_tail(&r->hts_prod, head, n, 1);
+	}
+
+	if (free_space != NULL)
+		*free_space = free - n;
+	return n;
+}
+
+/**
+ * @internal Dequeue several objects from the HTS ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to pull from the ring.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Dequeue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param available
+ *   returns the number of remaining ring entries after the dequeue has finished
+ * @return
+ *   - Actual number of objects dequeued.
+ *     If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_hts_dequeue_elem(struct rte_ring *r, void *obj_table,
+	uint32_t esize, uint32_t n, enum rte_ring_queue_behavior behavior,
+	uint32_t *available)
+{
+	uint32_t entries, head;
+
+	n = __rte_ring_hts_move_cons_head(r, n, behavior, &head, &entries);
+
+	if (n != 0) {
+		__rte_ring_dequeue_elems(r, head, obj_table, esize, n);
+		__rte_ring_hts_update_tail(&r->hts_cons, head, n, 0);
+	}
+
+	if (available != NULL)
+		*available = entries - n;
+	return n;
+}
+
+/**
+ * Enqueue several objects on the HTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mp_hts_enqueue_bulk_elem(struct rte_ring *r, const void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_hts_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, free_space);
+}
+
+/**
+ * Dequeue several objects from an HTS ring (multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mc_hts_dequeue_bulk_elem(struct rte_ring *r, void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_hts_dequeue_elem(r, obj_table, esize, n,
+		RTE_RING_QUEUE_FIXED, available);
+}
+
+/**
+ * Enqueue several objects on the HTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mp_hts_enqueue_burst_elem(struct rte_ring *r, const void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_hts_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, free_space);
+}
+
+/**
+ * Dequeue several objects from an HTS  ring (multi-consumers safe).
+ * When the requested objects are more than the available objects,
+ * only dequeue the actual number of objects.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mc_hts_dequeue_burst_elem(struct rte_ring *r, void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_hts_dequeue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, available);
+}
+
+/**
+ * Enqueue several objects on the HTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mp_hts_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return rte_ring_mp_hts_enqueue_bulk_elem(r, obj_table,
+			sizeof(uintptr_t), n, free_space);
+}
+
+/**
+ * Dequeue several objects from an HTS ring (multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mc_hts_dequeue_bulk(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return rte_ring_mc_hts_dequeue_bulk_elem(r, obj_table,
+			sizeof(uintptr_t), n, available);
+}
+
+/**
+ * Enqueue several objects on the HTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mp_hts_enqueue_burst(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return rte_ring_mp_hts_enqueue_burst_elem(r, obj_table,
+			sizeof(uintptr_t), n, free_space);
+}
+
+/**
+ * Dequeue several objects from an HTS  ring (multi-consumers safe).
+ * When the requested objects are more than the available objects,
+ * only dequeue the actual number of objects.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mc_hts_dequeue_burst(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return rte_ring_mc_hts_dequeue_burst_elem(r, obj_table,
+			sizeof(uintptr_t), n, available);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_RING_HTS_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_hts_c11_mem.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_hts_c11_mem.h
new file mode 100644
index 000000000..16e54b6ff
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_hts_c11_mem.h
@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_HTS_C11_MEM_H_
+#define _RTE_RING_HTS_C11_MEM_H_
+
+/**
+ * @file rte_ring_hts_c11_mem.h
+ * It is not recommended to include this file directly,
+ * include <rte_ring.h> instead.
+ * Contains internal helper functions for head/tail sync (HTS) ring mode.
+ * For more information please refer to <rte_ring_hts.h>.
+ */
+
+/**
+ * @internal update tail with new value.
+ */
+static __rte_always_inline void
+__rte_ring_hts_update_tail(struct rte_ring_hts_headtail *ht, uint32_t old_tail,
+	uint32_t num, uint32_t enqueue)
+{
+	uint32_t tail;
+
+	RTE_SET_USED(enqueue);
+
+	tail = old_tail + num;
+	__atomic_store_n(&ht->ht.pos.tail, tail, __ATOMIC_RELEASE);
+}
+
+/**
+ * @internal waits till tail will become equal to head.
+ * Means no writer/reader is active for that ring.
+ * Suppose to work as serialization point.
+ */
+static __rte_always_inline void
+__rte_ring_hts_head_wait(const struct rte_ring_hts_headtail *ht,
+		union __rte_ring_hts_pos *p)
+{
+	while (p->pos.head != p->pos.tail) {
+		rte_pause();
+		p->raw = __atomic_load_n(&ht->ht.raw, __ATOMIC_ACQUIRE);
+	}
+}
+
+/**
+ * @internal This function updates the producer head for enqueue
+ */
+static __rte_always_inline unsigned int
+__rte_ring_hts_move_prod_head(struct rte_ring *r, unsigned int num,
+	enum rte_ring_queue_behavior behavior, uint32_t *old_head,
+	uint32_t *free_entries)
+{
+	uint32_t n;
+	union __rte_ring_hts_pos np, op;
+
+	const uint32_t capacity = r->capacity;
+
+	op.raw = __atomic_load_n(&r->hts_prod.ht.raw, __ATOMIC_ACQUIRE);
+
+	do {
+		/* Reset n to the initial burst count */
+		n = num;
+
+		/*
+		 * wait for tail to be equal to head,
+		 * make sure that we read prod head/tail *before*
+		 * reading cons tail.
+		 */
+		__rte_ring_hts_head_wait(&r->hts_prod, &op);
+
+		/*
+		 *  The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * *old_head > cons_tail). So 'free_entries' is always between 0
+		 * and capacity (which is < size).
+		 */
+		*free_entries = capacity + r->cons.tail - op.pos.head;
+
+		/* check that we have enough room in ring */
+		if (unlikely(n > *free_entries))
+			n = (behavior == RTE_RING_QUEUE_FIXED) ?
+					0 : *free_entries;
+
+		if (n == 0)
+			break;
+
+		np.pos.tail = op.pos.tail;
+		np.pos.head = op.pos.head + n;
+
+	/*
+	 * this CAS(ACQUIRE, ACQUIRE) serves as a hoist barrier to prevent:
+	 *  - OOO reads of cons tail value
+	 *  - OOO copy of elems from the ring
+	 */
+	} while (__atomic_compare_exchange_n(&r->hts_prod.ht.raw,
+			&op.raw, np.raw,
+			0, __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE) == 0);
+
+	*old_head = op.pos.head;
+	return n;
+}
+
+/**
+ * @internal This function updates the consumer head for dequeue
+ */
+static __rte_always_inline unsigned int
+__rte_ring_hts_move_cons_head(struct rte_ring *r, unsigned int num,
+	enum rte_ring_queue_behavior behavior, uint32_t *old_head,
+	uint32_t *entries)
+{
+	uint32_t n;
+	union __rte_ring_hts_pos np, op;
+
+	op.raw = __atomic_load_n(&r->hts_cons.ht.raw, __ATOMIC_ACQUIRE);
+
+	/* move cons.head atomically */
+	do {
+		/* Restore n as it may change every loop */
+		n = num;
+
+		/*
+		 * wait for tail to be equal to head,
+		 * make sure that we read cons head/tail *before*
+		 * reading prod tail.
+		 */
+		__rte_ring_hts_head_wait(&r->hts_cons, &op);
+
+		/* The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * cons_head > prod_tail). So 'entries' is always between 0
+		 * and size(ring)-1.
+		 */
+		*entries = r->prod.tail - op.pos.head;
+
+		/* Set the actual entries for dequeue */
+		if (n > *entries)
+			n = (behavior == RTE_RING_QUEUE_FIXED) ? 0 : *entries;
+
+		if (unlikely(n == 0))
+			break;
+
+		np.pos.tail = op.pos.tail;
+		np.pos.head = op.pos.head + n;
+
+	/*
+	 * this CAS(ACQUIRE, ACQUIRE) serves as a hoist barrier to prevent:
+	 *  - OOO reads of prod tail value
+	 *  - OOO copy of elems from the ring
+	 */
+	} while (__atomic_compare_exchange_n(&r->hts_cons.ht.raw,
+			&op.raw, np.raw,
+			0, __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE) == 0);
+
+	*old_head = op.pos.head;
+	return n;
+}
+
+#endif /* _RTE_RING_HTS_C11_MEM_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_peek.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_peek.h
new file mode 100644
index 000000000..45f707dc7
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_peek.h
@@ -0,0 +1,454 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_PEEK_H_
+#define _RTE_RING_PEEK_H_
+
+/**
+ * @file
+ * @b EXPERIMENTAL: this API may change without prior notice
+ * It is not recommended to include this file directly.
+ * Please include <rte_ring_elem.h> instead.
+ *
+ * Ring Peek API
+ * Introduction of rte_ring with serialized producer/consumer (HTS sync mode)
+ * makes possible to split public enqueue/dequeue API into two phases:
+ * - enqueue/dequeue start
+ * - enqueue/dequeue finish
+ * That allows user to inspect objects in the ring without removing them
+ * from it (aka MT safe peek).
+ * Note that right now this new API is available only for two sync modes:
+ * 1) Single Producer/Single Consumer (RTE_RING_SYNC_ST)
+ * 2) Serialized Producer/Serialized Consumer (RTE_RING_SYNC_MT_HTS).
+ * It is a user responsibility to create/init ring with appropriate sync
+ * modes selected.
+ * As an example:
+ * // read 1 elem from the ring:
+ * n = rte_ring_dequeue_bulk_start(ring, &obj, 1, NULL);
+ * if (n != 0) {
+ *    //examine object
+ *    if (object_examine(obj) == KEEP)
+ *       //decided to keep it in the ring.
+ *       rte_ring_dequeue_finish(ring, 0);
+ *    else
+ *       //decided to remove it from the ring.
+ *       rte_ring_dequeue_finish(ring, n);
+ * }
+ * Note that between _start_ and _finish_ none other thread can proceed
+ * with enqueue(/dequeue) operation till _finish_ completes.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_ring_peek_c11_mem.h>
+
+/**
+ * @internal This function moves prod head value.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_enqueue_start(struct rte_ring *r, uint32_t n,
+		enum rte_ring_queue_behavior behavior, uint32_t *free_space)
+{
+	uint32_t free, head, next;
+
+	switch (r->prod.sync_type) {
+	case RTE_RING_SYNC_ST:
+		n = __rte_ring_move_prod_head(r, RTE_RING_SYNC_ST, n,
+			behavior, &head, &next, &free);
+		break;
+	case RTE_RING_SYNC_MT_HTS:
+		n =  __rte_ring_hts_move_prod_head(r, n, behavior,
+			&head, &free);
+		break;
+	case RTE_RING_SYNC_MT:
+	case RTE_RING_SYNC_MT_RTS:
+	default:
+		/* unsupported mode, shouldn't be here */
+		RTE_ASSERT(0);
+		n = 0;
+		free = 0;
+	}
+
+	if (free_space != NULL)
+		*free_space = free - n;
+	return n;
+}
+
+/**
+ * Start to enqueue several objects on the ring.
+ * Note that no actual objects are put in the queue by this function,
+ * it just reserves for user such ability.
+ * User has to call appropriate enqueue_elem_finish() to copy objects into the
+ * queue and complete given enqueue operation.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects that can be enqueued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_enqueue_bulk_elem_start(struct rte_ring *r, unsigned int n,
+		unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue_start(r, n, RTE_RING_QUEUE_FIXED,
+			free_space);
+}
+
+/**
+ * Start to enqueue several objects on the ring.
+ * Note that no actual objects are put in the queue by this function,
+ * it just reserves for user such ability.
+ * User has to call appropriate enqueue_finish() to copy objects into the
+ * queue and complete given enqueue operation.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects that can be enqueued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_enqueue_bulk_start(struct rte_ring *r, unsigned int n,
+		unsigned int *free_space)
+{
+	return rte_ring_enqueue_bulk_elem_start(r, n, free_space);
+}
+
+/**
+ * Start to enqueue several objects on the ring.
+ * Note that no actual objects are put in the queue by this function,
+ * it just reserves for user such ability.
+ * User has to call appropriate enqueue_elem_finish() to copy objects into the
+ * queue and complete given enqueue operation.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   Actual number of objects that can be enqueued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_enqueue_burst_elem_start(struct rte_ring *r, unsigned int n,
+		unsigned int *free_space)
+{
+	return __rte_ring_do_enqueue_start(r, n, RTE_RING_QUEUE_VARIABLE,
+			free_space);
+}
+
+/**
+ * Start to enqueue several objects on the ring.
+ * Note that no actual objects are put in the queue by this function,
+ * it just reserves for user such ability.
+ * User has to call appropriate enqueue_finish() to copy objects into the
+ * queue and complete given enqueue operation.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   Actual number of objects that can be enqueued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_enqueue_burst_start(struct rte_ring *r, unsigned int n,
+		unsigned int *free_space)
+{
+	return rte_ring_enqueue_burst_elem_start(r, n, free_space);
+}
+
+/**
+ * Complete to enqueue several objects on the ring.
+ * Note that number of objects to enqueue should not exceed previous
+ * enqueue_start return value.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add to the ring from the obj_table.
+ */
+__rte_experimental
+static __rte_always_inline void
+rte_ring_enqueue_elem_finish(struct rte_ring *r, const void *obj_table,
+		unsigned int esize, unsigned int n)
+{
+	uint32_t tail;
+
+	switch (r->prod.sync_type) {
+	case RTE_RING_SYNC_ST:
+		n = __rte_ring_st_get_tail(&r->prod, &tail, n);
+		if (n != 0)
+			__rte_ring_enqueue_elems(r, tail, obj_table, esize, n);
+		__rte_ring_st_set_head_tail(&r->prod, tail, n, 1);
+		break;
+	case RTE_RING_SYNC_MT_HTS:
+		n = __rte_ring_hts_get_tail(&r->hts_prod, &tail, n);
+		if (n != 0)
+			__rte_ring_enqueue_elems(r, tail, obj_table, esize, n);
+		__rte_ring_hts_set_head_tail(&r->hts_prod, tail, n, 1);
+		break;
+	case RTE_RING_SYNC_MT:
+	case RTE_RING_SYNC_MT_RTS:
+	default:
+		/* unsupported mode, shouldn't be here */
+		RTE_ASSERT(0);
+	}
+}
+
+/**
+ * Complete to enqueue several objects on the ring.
+ * Note that number of objects to enqueue should not exceed previous
+ * enqueue_start return value.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param n
+ *   The number of objects to add to the ring from the obj_table.
+ */
+__rte_experimental
+static __rte_always_inline void
+rte_ring_enqueue_finish(struct rte_ring *r, void * const *obj_table,
+		unsigned int n)
+{
+	rte_ring_enqueue_elem_finish(r, obj_table, sizeof(uintptr_t), n);
+}
+
+/**
+ * @internal This function moves cons head value and copies up to *n*
+ * objects from the ring to the user provided obj_table.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_dequeue_start(struct rte_ring *r, void *obj_table,
+	uint32_t esize, uint32_t n, enum rte_ring_queue_behavior behavior,
+	uint32_t *available)
+{
+	uint32_t avail, head, next;
+
+	switch (r->cons.sync_type) {
+	case RTE_RING_SYNC_ST:
+		n = __rte_ring_move_cons_head(r, RTE_RING_SYNC_ST, n,
+			behavior, &head, &next, &avail);
+		break;
+	case RTE_RING_SYNC_MT_HTS:
+		n =  __rte_ring_hts_move_cons_head(r, n, behavior,
+			&head, &avail);
+		break;
+	case RTE_RING_SYNC_MT:
+	case RTE_RING_SYNC_MT_RTS:
+	default:
+		/* unsupported mode, shouldn't be here */
+		RTE_ASSERT(0);
+		n = 0;
+		avail = 0;
+	}
+
+	if (n != 0)
+		__rte_ring_dequeue_elems(r, head, obj_table, esize, n);
+
+	if (available != NULL)
+		*available = avail - n;
+	return n;
+}
+
+/**
+ * Start to dequeue several objects from the ring.
+ * Note that user has to call appropriate dequeue_finish()
+ * to complete given dequeue operation and actually remove objects the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n.
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_dequeue_bulk_elem_start(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue_start(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, available);
+}
+
+/**
+ * Start to dequeue several objects from the ring.
+ * Note that user has to call appropriate dequeue_finish()
+ * to complete given dequeue operation and actually remove objects the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   Actual number of objects dequeued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_dequeue_bulk_start(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return rte_ring_dequeue_bulk_elem_start(r, obj_table, sizeof(uintptr_t),
+		n, available);
+}
+
+/**
+ * Start to dequeue several objects from the ring.
+ * Note that user has to call appropriate dequeue_finish()
+ * to complete given dequeue operation and actually remove objects the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The actual number of objects dequeued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_dequeue_burst_elem_start(struct rte_ring *r, void *obj_table,
+		unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_dequeue_start(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, available);
+}
+
+/**
+ * Start to dequeue several objects from the ring.
+ * Note that user has to call appropriate dequeue_finish()
+ * to complete given dequeue operation and actually remove objects the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The actual number of objects dequeued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_dequeue_burst_start(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return rte_ring_dequeue_burst_elem_start(r, obj_table,
+		sizeof(uintptr_t), n, available);
+}
+
+/**
+ * Complete to dequeue several objects from the ring.
+ * Note that number of objects to dequeue should not exceed previous
+ * dequeue_start return value.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param n
+ *   The number of objects to remove from the ring.
+ */
+__rte_experimental
+static __rte_always_inline void
+rte_ring_dequeue_elem_finish(struct rte_ring *r, unsigned int n)
+{
+	uint32_t tail;
+
+	switch (r->cons.sync_type) {
+	case RTE_RING_SYNC_ST:
+		n = __rte_ring_st_get_tail(&r->cons, &tail, n);
+		__rte_ring_st_set_head_tail(&r->cons, tail, n, 0);
+		break;
+	case RTE_RING_SYNC_MT_HTS:
+		n = __rte_ring_hts_get_tail(&r->hts_cons, &tail, n);
+		__rte_ring_hts_set_head_tail(&r->hts_cons, tail, n, 0);
+		break;
+	case RTE_RING_SYNC_MT:
+	case RTE_RING_SYNC_MT_RTS:
+	default:
+		/* unsupported mode, shouldn't be here */
+		RTE_ASSERT(0);
+	}
+}
+
+/**
+ * Complete to dequeue several objects from the ring.
+ * Note that number of objects to dequeue should not exceed previous
+ * dequeue_start return value.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param n
+ *   The number of objects to remove from the ring.
+ */
+__rte_experimental
+static __rte_always_inline void
+rte_ring_dequeue_finish(struct rte_ring *r, unsigned int n)
+{
+	rte_ring_dequeue_elem_finish(r, n);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_RING_PEEK_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_peek_c11_mem.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_peek_c11_mem.h
new file mode 100644
index 000000000..99321f124
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_peek_c11_mem.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_PEEK_C11_MEM_H_
+#define _RTE_RING_PEEK_C11_MEM_H_
+
+/**
+ * @file rte_ring_peek_c11_mem.h
+ * It is not recommended to include this file directly,
+ * include <rte_ring.h> instead.
+ * Contains internal helper functions for rte_ring peek API.
+ * For more information please refer to <rte_ring_peek.h>.
+ */
+
+/**
+ * @internal get current tail value.
+ * This function should be used only for single thread producer/consumer.
+ * Check that user didn't request to move tail above the head.
+ * In that situation:
+ * - return zero, that will cause abort any pending changes and
+ *   return head to its previous position.
+ * - throw an assert in debug mode.
+ */
+static __rte_always_inline uint32_t
+__rte_ring_st_get_tail(struct rte_ring_headtail *ht, uint32_t *tail,
+	uint32_t num)
+{
+	uint32_t h, n, t;
+
+	h = ht->head;
+	t = ht->tail;
+	n = h - t;
+
+	RTE_ASSERT(n >= num);
+	num = (n >= num) ? num : 0;
+
+	*tail = h;
+	return num;
+}
+
+/**
+ * @internal set new values for head and tail.
+ * This function should be used only for single thread producer/consumer.
+ * Should be used only in conjunction with __rte_ring_st_get_tail.
+ */
+static __rte_always_inline void
+__rte_ring_st_set_head_tail(struct rte_ring_headtail *ht, uint32_t tail,
+	uint32_t num, uint32_t enqueue)
+{
+	uint32_t pos;
+
+	RTE_SET_USED(enqueue);
+
+	pos = tail + num;
+	ht->head = pos;
+	__atomic_store_n(&ht->tail, pos, __ATOMIC_RELEASE);
+}
+
+/**
+ * @internal get current tail value.
+ * This function should be used only for producer/consumer in MT_HTS mode.
+ * Check that user didn't request to move tail above the head.
+ * In that situation:
+ * - return zero, that will cause abort any pending changes and
+ *   return head to its previous position.
+ * - throw an assert in debug mode.
+ */
+static __rte_always_inline uint32_t
+__rte_ring_hts_get_tail(struct rte_ring_hts_headtail *ht, uint32_t *tail,
+	uint32_t num)
+{
+	uint32_t n;
+	union __rte_ring_hts_pos p;
+
+	p.raw = __atomic_load_n(&ht->ht.raw, __ATOMIC_RELAXED);
+	n = p.pos.head - p.pos.tail;
+
+	RTE_ASSERT(n >= num);
+	num = (n >= num) ? num : 0;
+
+	*tail = p.pos.tail;
+	return num;
+}
+
+/**
+ * @internal set new values for head and tail as one atomic 64 bit operation.
+ * This function should be used only for producer/consumer in MT_HTS mode.
+ * Should be used only in conjunction with __rte_ring_hts_get_tail.
+ */
+static __rte_always_inline void
+__rte_ring_hts_set_head_tail(struct rte_ring_hts_headtail *ht, uint32_t tail,
+	uint32_t num, uint32_t enqueue)
+{
+	union __rte_ring_hts_pos p;
+
+	RTE_SET_USED(enqueue);
+
+	p.pos.head = tail + num;
+	p.pos.tail = p.pos.head;
+
+	__atomic_store_n(&ht->ht.raw, p.raw, __ATOMIC_RELEASE);
+}
+
+#endif /* _RTE_RING_PEEK_C11_MEM_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_rts.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_rts.h
new file mode 100644
index 000000000..d40e9994f
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_rts.h
@@ -0,0 +1,439 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_RTS_H_
+#define _RTE_RING_RTS_H_
+
+/**
+ * @file rte_ring_rts.h
+ * @b EXPERIMENTAL: this API may change without prior notice
+ * It is not recommended to include this file directly.
+ * Please include <rte_ring.h> instead.
+ *
+ * Contains functions for Relaxed Tail Sync (RTS) ring mode.
+ * The main idea remains the same as for our original MP/MC synchronization
+ * mechanism.
+ * The main difference is that tail value is increased not
+ * by every thread that finished enqueue/dequeue,
+ * but only by the current last one doing enqueue/dequeue.
+ * That allows threads to skip spinning on tail value,
+ * leaving actual tail value change to last thread at a given instance.
+ * RTS requires 2 64-bit CAS for each enqueue(/dequeue) operation:
+ * one for head update, second for tail update.
+ * As a gain it allows thread to avoid spinning/waiting on tail value.
+ * In comparison original MP/MC algorithm requires one 32-bit CAS
+ * for head update and waiting/spinning on tail value.
+ *
+ * Brief outline:
+ *  - introduce update counter (cnt) for both head and tail.
+ *  - increment head.cnt for each head.value update
+ *  - write head.value and head.cnt atomically (64-bit CAS)
+ *  - move tail.value ahead only when tail.cnt + 1 == head.cnt
+ *    (indicating that this is the last thread updating the tail)
+ *  - increment tail.cnt when each enqueue/dequeue op finishes
+ *    (no matter if tail.value going to change or not)
+ *  - write tail.value and tail.cnt atomically (64-bit CAS)
+ *
+ * To avoid producer/consumer starvation:
+ *  - limit max allowed distance between head and tail value (HTD_MAX).
+ *    I.E. thread is allowed to proceed with changing head.value,
+ *    only when:  head.value - tail.value <= HTD_MAX
+ * HTD_MAX is an optional parameter.
+ * With HTD_MAX == 0 we'll have fully serialized ring -
+ * i.e. only one thread at a time will be able to enqueue/dequeue
+ * to/from the ring.
+ * With HTD_MAX >= ring.capacity - no limitation.
+ * By default HTD_MAX == ring.capacity / 8.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_ring_rts_c11_mem.h>
+
+/**
+ * @internal Enqueue several objects on the RTS ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Enqueue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param free_space
+ *   returns the amount of space after the enqueue operation has finished
+ * @return
+ *   Actual number of objects enqueued.
+ *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_rts_enqueue_elem(struct rte_ring *r, const void *obj_table,
+	uint32_t esize, uint32_t n, enum rte_ring_queue_behavior behavior,
+	uint32_t *free_space)
+{
+	uint32_t free, head;
+
+	n =  __rte_ring_rts_move_prod_head(r, n, behavior, &head, &free);
+
+	if (n != 0) {
+		__rte_ring_enqueue_elems(r, head, obj_table, esize, n);
+		__rte_ring_rts_update_tail(&r->rts_prod);
+	}
+
+	if (free_space != NULL)
+		*free_space = free - n;
+	return n;
+}
+
+/**
+ * @internal Dequeue several objects from the RTS ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to pull from the ring.
+ * @param behavior
+ *   RTE_RING_QUEUE_FIXED:    Dequeue a fixed number of items from a ring
+ *   RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param available
+ *   returns the number of remaining ring entries after the dequeue has finished
+ * @return
+ *   - Actual number of objects dequeued.
+ *     If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
+ */
+static __rte_always_inline unsigned int
+__rte_ring_do_rts_dequeue_elem(struct rte_ring *r, void *obj_table,
+	uint32_t esize, uint32_t n, enum rte_ring_queue_behavior behavior,
+	uint32_t *available)
+{
+	uint32_t entries, head;
+
+	n = __rte_ring_rts_move_cons_head(r, n, behavior, &head, &entries);
+
+	if (n != 0) {
+		__rte_ring_dequeue_elems(r, head, obj_table, esize, n);
+		__rte_ring_rts_update_tail(&r->rts_cons);
+	}
+
+	if (available != NULL)
+		*available = entries - n;
+	return n;
+}
+
+/**
+ * Enqueue several objects on the RTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mp_rts_enqueue_bulk_elem(struct rte_ring *r, const void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_rts_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, free_space);
+}
+
+/**
+ * Dequeue several objects from an RTS ring (multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mc_rts_dequeue_bulk_elem(struct rte_ring *r, void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_rts_dequeue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_FIXED, available);
+}
+
+/**
+ * Enqueue several objects on the RTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mp_rts_enqueue_burst_elem(struct rte_ring *r, const void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *free_space)
+{
+	return __rte_ring_do_rts_enqueue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, free_space);
+}
+
+/**
+ * Dequeue several objects from an RTS  ring (multi-consumers safe).
+ * When the requested objects are more than the available objects,
+ * only dequeue the actual number of objects.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of objects that will be filled.
+ * @param esize
+ *   The size of ring element, in bytes. It must be a multiple of 4.
+ *   This must be the same value used while creating the ring. Otherwise
+ *   the results are undefined.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mc_rts_dequeue_burst_elem(struct rte_ring *r, void *obj_table,
+	unsigned int esize, unsigned int n, unsigned int *available)
+{
+	return __rte_ring_do_rts_dequeue_elem(r, obj_table, esize, n,
+			RTE_RING_QUEUE_VARIABLE, available);
+}
+
+/**
+ * Enqueue several objects on the RTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   The number of objects enqueued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mp_rts_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return rte_ring_mp_rts_enqueue_bulk_elem(r, obj_table,
+			sizeof(uintptr_t), n, free_space);
+}
+
+/**
+ * Dequeue several objects from an RTS ring (multi-consumers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   The number of objects dequeued, either 0 or n
+ */
+__rte_experimental
+static __rte_always_inline unsigned int
+rte_ring_mc_rts_dequeue_bulk(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return rte_ring_mc_rts_dequeue_bulk_elem(r, obj_table,
+			sizeof(uintptr_t), n, available);
+}
+
+/**
+ * Enqueue several objects on the RTS ring (multi-producers safe).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to add in the ring from the obj_table.
+ * @param free_space
+ *   if non-NULL, returns the amount of space in the ring after the
+ *   enqueue operation has finished.
+ * @return
+ *   - n: Actual number of objects enqueued.
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mp_rts_enqueue_burst(struct rte_ring *r, void * const *obj_table,
+			 unsigned int n, unsigned int *free_space)
+{
+	return rte_ring_mp_rts_enqueue_burst_elem(r, obj_table,
+			sizeof(uintptr_t), n, free_space);
+}
+
+/**
+ * Dequeue several objects from an RTS  ring (multi-consumers safe).
+ * When the requested objects are more than the available objects,
+ * only dequeue the actual number of objects.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects) that will be filled.
+ * @param n
+ *   The number of objects to dequeue from the ring to the obj_table.
+ * @param available
+ *   If non-NULL, returns the number of remaining ring entries after the
+ *   dequeue has finished.
+ * @return
+ *   - n: Actual number of objects dequeued, 0 if ring is empty
+ */
+__rte_experimental
+static __rte_always_inline unsigned
+rte_ring_mc_rts_dequeue_burst(struct rte_ring *r, void **obj_table,
+		unsigned int n, unsigned int *available)
+{
+	return rte_ring_mc_rts_dequeue_burst_elem(r, obj_table,
+			sizeof(uintptr_t), n, available);
+}
+
+/**
+ * Return producer max Head-Tail-Distance (HTD).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   Producer HTD value, if producer is set in appropriate sync mode,
+ *   or UINT32_MAX otherwise.
+ */
+__rte_experimental
+static inline uint32_t
+rte_ring_get_prod_htd_max(const struct rte_ring *r)
+{
+	if (r->prod.sync_type == RTE_RING_SYNC_MT_RTS)
+		return r->rts_prod.htd_max;
+	return UINT32_MAX;
+}
+
+/**
+ * Set producer max Head-Tail-Distance (HTD).
+ * Note that producer has to use appropriate sync mode (RTS).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param v
+ *   new HTD value to setup.
+ * @return
+ *   Zero on success, or negative error code otherwise.
+ */
+__rte_experimental
+static inline int
+rte_ring_set_prod_htd_max(struct rte_ring *r, uint32_t v)
+{
+	if (r->prod.sync_type != RTE_RING_SYNC_MT_RTS)
+		return -ENOTSUP;
+
+	r->rts_prod.htd_max = v;
+	return 0;
+}
+
+/**
+ * Return consumer max Head-Tail-Distance (HTD).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   Consumer HTD value, if consumer is set in appropriate sync mode,
+ *   or UINT32_MAX otherwise.
+ */
+__rte_experimental
+static inline uint32_t
+rte_ring_get_cons_htd_max(const struct rte_ring *r)
+{
+	if (r->cons.sync_type == RTE_RING_SYNC_MT_RTS)
+		return r->rts_cons.htd_max;
+	return UINT32_MAX;
+}
+
+/**
+ * Set consumer max Head-Tail-Distance (HTD).
+ * Note that consumer has to use appropriate sync mode (RTS).
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @param v
+ *   new HTD value to setup.
+ * @return
+ *   Zero on success, or negative error code otherwise.
+ */
+__rte_experimental
+static inline int
+rte_ring_set_cons_htd_max(struct rte_ring *r, uint32_t v)
+{
+	if (r->cons.sync_type != RTE_RING_SYNC_MT_RTS)
+		return -ENOTSUP;
+
+	r->rts_cons.htd_max = v;
+	return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_RING_RTS_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_rts_c11_mem.h b/src/spdk/dpdk/lib/librte_ring/rte_ring_rts_c11_mem.h
new file mode 100644
index 000000000..327f22796
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_rts_c11_mem.h
@@ -0,0 +1,179 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2010-2020 Intel Corporation
+ * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ * Derived from FreeBSD's bufring.h
+ * Used as BSD-3 Licensed with permission from Kip Macy.
+ */
+
+#ifndef _RTE_RING_RTS_C11_MEM_H_
+#define _RTE_RING_RTS_C11_MEM_H_
+
+/**
+ * @file rte_ring_rts_c11_mem.h
+ * It is not recommended to include this file directly,
+ * include <rte_ring.h> instead.
+ * Contains internal helper functions for Relaxed Tail Sync (RTS) ring mode.
+ * For more information please refer to <rte_ring_rts.h>.
+ */
+
+/**
+ * @internal This function updates tail values.
+ */
+static __rte_always_inline void
+__rte_ring_rts_update_tail(struct rte_ring_rts_headtail *ht)
+{
+	union __rte_ring_rts_poscnt h, ot, nt;
+
+	/*
+	 * If there are other enqueues/dequeues in progress that
+	 * might preceded us, then don't update tail with new value.
+	 */
+
+	ot.raw = __atomic_load_n(&ht->tail.raw, __ATOMIC_ACQUIRE);
+
+	do {
+		/* on 32-bit systems we have to do atomic read here */
+		h.raw = __atomic_load_n(&ht->head.raw, __ATOMIC_RELAXED);
+
+		nt.raw = ot.raw;
+		if (++nt.val.cnt == h.val.cnt)
+			nt.val.pos = h.val.pos;
+
+	} while (__atomic_compare_exchange_n(&ht->tail.raw, &ot.raw, nt.raw,
+			0, __ATOMIC_RELEASE, __ATOMIC_ACQUIRE) == 0);
+}
+
+/**
+ * @internal This function waits till head/tail distance wouldn't
+ * exceed pre-defined max value.
+ */
+static __rte_always_inline void
+__rte_ring_rts_head_wait(const struct rte_ring_rts_headtail *ht,
+	union __rte_ring_rts_poscnt *h)
+{
+	uint32_t max;
+
+	max = ht->htd_max;
+
+	while (h->val.pos - ht->tail.val.pos > max) {
+		rte_pause();
+		h->raw = __atomic_load_n(&ht->head.raw, __ATOMIC_ACQUIRE);
+	}
+}
+
+/**
+ * @internal This function updates the producer head for enqueue.
+ */
+static __rte_always_inline uint32_t
+__rte_ring_rts_move_prod_head(struct rte_ring *r, uint32_t num,
+	enum rte_ring_queue_behavior behavior, uint32_t *old_head,
+	uint32_t *free_entries)
+{
+	uint32_t n;
+	union __rte_ring_rts_poscnt nh, oh;
+
+	const uint32_t capacity = r->capacity;
+
+	oh.raw = __atomic_load_n(&r->rts_prod.head.raw, __ATOMIC_ACQUIRE);
+
+	do {
+		/* Reset n to the initial burst count */
+		n = num;
+
+		/*
+		 * wait for prod head/tail distance,
+		 * make sure that we read prod head *before*
+		 * reading cons tail.
+		 */
+		__rte_ring_rts_head_wait(&r->rts_prod, &oh);
+
+		/*
+		 *  The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * *old_head > cons_tail). So 'free_entries' is always between 0
+		 * and capacity (which is < size).
+		 */
+		*free_entries = capacity + r->cons.tail - oh.val.pos;
+
+		/* check that we have enough room in ring */
+		if (unlikely(n > *free_entries))
+			n = (behavior == RTE_RING_QUEUE_FIXED) ?
+					0 : *free_entries;
+
+		if (n == 0)
+			break;
+
+		nh.val.pos = oh.val.pos + n;
+		nh.val.cnt = oh.val.cnt + 1;
+
+	/*
+	 * this CAS(ACQUIRE, ACQUIRE) serves as a hoist barrier to prevent:
+	 *  - OOO reads of cons tail value
+	 *  - OOO copy of elems to the ring
+	 */
+	} while (__atomic_compare_exchange_n(&r->rts_prod.head.raw,
+			&oh.raw, nh.raw,
+			0, __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE) == 0);
+
+	*old_head = oh.val.pos;
+	return n;
+}
+
+/**
+ * @internal This function updates the consumer head for dequeue
+ */
+static __rte_always_inline unsigned int
+__rte_ring_rts_move_cons_head(struct rte_ring *r, uint32_t num,
+	enum rte_ring_queue_behavior behavior, uint32_t *old_head,
+	uint32_t *entries)
+{
+	uint32_t n;
+	union __rte_ring_rts_poscnt nh, oh;
+
+	oh.raw = __atomic_load_n(&r->rts_cons.head.raw, __ATOMIC_ACQUIRE);
+
+	/* move cons.head atomically */
+	do {
+		/* Restore n as it may change every loop */
+		n = num;
+
+		/*
+		 * wait for cons head/tail distance,
+		 * make sure that we read cons head *before*
+		 * reading prod tail.
+		 */
+		__rte_ring_rts_head_wait(&r->rts_cons, &oh);
+
+		/* The subtraction is done between two unsigned 32bits value
+		 * (the result is always modulo 32 bits even if we have
+		 * cons_head > prod_tail). So 'entries' is always between 0
+		 * and size(ring)-1.
+		 */
+		*entries = r->prod.tail - oh.val.pos;
+
+		/* Set the actual entries for dequeue */
+		if (n > *entries)
+			n = (behavior == RTE_RING_QUEUE_FIXED) ? 0 : *entries;
+
+		if (unlikely(n == 0))
+			break;
+
+		nh.val.pos = oh.val.pos + n;
+		nh.val.cnt = oh.val.cnt + 1;
+
+	/*
+	 * this CAS(ACQUIRE, ACQUIRE) serves as a hoist barrier to prevent:
+	 *  - OOO reads of prod tail value
+	 *  - OOO copy of elems from the ring
+	 */
+	} while (__atomic_compare_exchange_n(&r->rts_cons.head.raw,
+			&oh.raw, nh.raw,
+			0, __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE) == 0);
+
+	*old_head = oh.val.pos;
+	return n;
+}
+
+#endif /* _RTE_RING_RTS_C11_MEM_H_ */
diff --git a/src/spdk/dpdk/lib/librte_ring/rte_ring_version.map b/src/spdk/dpdk/lib/librte_ring/rte_ring_version.map
new file mode 100644
index 000000000..e88c143cf
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_ring/rte_ring_version.map
@@ -0,0 +1,24 @@
+DPDK_20.0 {
+	global:
+
+	rte_ring_create;
+	rte_ring_dump;
+	rte_ring_free;
+	rte_ring_get_memsize;
+	rte_ring_init;
+	rte_ring_list_dump;
+	rte_ring_lookup;
+
+	local: *;
+};
+
+EXPERIMENTAL {
+	global:
+
+	# added in 19.08
+	rte_ring_reset;
+
+	# added in 20.02
+	rte_ring_create_elem;
+	rte_ring_get_memsize_elem;
+};