[PATCH v5 1/8] stack: introduce rte stack library

[Gage Eads <gage.eads@intel.com>]

The rte_stack library provides an API for configuration and use of a
bounded stack of pointers. Push and pop operations are MT-safe, allowing
concurrent access, and the interface supports pushing and popping multiple
pointers at a time.

The library's interface is modeled after another DPDK data structure,
rte_ring, and its lock-based implementation is derived from the stack
mempool handler. An upcoming commit will migrate the stack mempool handler
to rte_stack.

Signed-off-by: Gage Eads <gage.eads@intel.com>
Reviewed-by: Olivier Matz <olivier.matz@6wind.com>
---
 MAINTAINERS                            |   6 +
 config/common_base                     |   5 +
 doc/api/doxy-api-index.md              |   1 +
 doc/api/doxy-api.conf.in               |   1 +
 doc/guides/prog_guide/index.rst        |   1 +
 doc/guides/prog_guide/stack_lib.rst    |  28 +++++
 doc/guides/rel_notes/release_19_05.rst |   5 +
 lib/Makefile                           |   2 +
 lib/librte_stack/Makefile              |  25 ++++
 lib/librte_stack/meson.build           |   8 ++
 lib/librte_stack/rte_stack.c           | 182 +++++++++++++++++++++++++++++
 lib/librte_stack/rte_stack.h           | 207 +++++++++++++++++++++++++++++++++
 lib/librte_stack/rte_stack_pvt.h       |  34 ++++++
 lib/librte_stack/rte_stack_std.c       |  26 +++++
 lib/librte_stack/rte_stack_std.h       | 119 +++++++++++++++++++
 lib/librte_stack/rte_stack_version.map |   9 ++
 lib/meson.build                        |   2 +-
 mk/rte.app.mk                          |   1 +
 18 files changed, 661 insertions(+), 1 deletion(-)
 create mode 100644 doc/guides/prog_guide/stack_lib.rst
 create mode 100644 lib/librte_stack/Makefile
 create mode 100644 lib/librte_stack/meson.build
 create mode 100644 lib/librte_stack/rte_stack.c
 create mode 100644 lib/librte_stack/rte_stack.h
 create mode 100644 lib/librte_stack/rte_stack_pvt.h
 create mode 100644 lib/librte_stack/rte_stack_std.c
 create mode 100644 lib/librte_stack/rte_stack_std.h
 create mode 100644 lib/librte_stack/rte_stack_version.map

diff --git a/MAINTAINERS b/MAINTAINERS
index e9ff2b4c2..09fd99dbf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -416,6 +416,12 @@ F: drivers/raw/skeleton_rawdev/
 F: app/test/test_rawdev.c
 F: doc/guides/prog_guide/rawdev.rst
 
+Stack API - EXPERIMENTAL
+M: Gage Eads <gage.eads@intel.com>
+M: Olivier Matz <olivier.matz@6wind.com>
+F: lib/librte_stack/
+F: doc/guides/prog_guide/stack_lib.rst
+
 
 Memory Pool Drivers
 -------------------
diff --git a/config/common_base b/config/common_base
index 6292bc4af..fc8dba69d 100644
--- a/config/common_base
+++ b/config/common_base
@@ -994,3 +994,8 @@ CONFIG_RTE_APP_CRYPTO_PERF=y
 # Compile the eventdev application
 #
 CONFIG_RTE_APP_EVENTDEV=y
+
+#
+# Compile librte_stack
+#
+CONFIG_RTE_LIBRTE_STACK=y
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index aacc66bd8..de1e215dd 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -125,6 +125,7 @@ The public API headers are grouped by topics:
   [mbuf]               (@ref rte_mbuf.h),
   [mbuf pool ops]      (@ref rte_mbuf_pool_ops.h),
   [ring]               (@ref rte_ring.h),
+  [stack]              (@ref rte_stack.h),
   [tailq]              (@ref rte_tailq.h),
   [bitmap]             (@ref rte_bitmap.h)
 
diff --git a/doc/api/doxy-api.conf.in b/doc/api/doxy-api.conf.in
index a365e669b..7722fc3e9 100644
--- a/doc/api/doxy-api.conf.in
+++ b/doc/api/doxy-api.conf.in
@@ -55,6 +55,7 @@ INPUT                   = @TOPDIR@/doc/api/doxy-api-index.md \
                           @TOPDIR@/lib/librte_ring \
                           @TOPDIR@/lib/librte_sched \
                           @TOPDIR@/lib/librte_security \
+                          @TOPDIR@/lib/librte_stack \
                           @TOPDIR@/lib/librte_table \
                           @TOPDIR@/lib/librte_telemetry \
                           @TOPDIR@/lib/librte_timer \
diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst
index 6726b1e8d..f4f60862f 100644
--- a/doc/guides/prog_guide/index.rst
+++ b/doc/guides/prog_guide/index.rst
@@ -55,6 +55,7 @@ Programmer's Guide
     metrics_lib
     bpf_lib
     ipsec_lib
+    stack_lib
     source_org
     dev_kit_build_system
     dev_kit_root_make_help
diff --git a/doc/guides/prog_guide/stack_lib.rst b/doc/guides/prog_guide/stack_lib.rst
new file mode 100644
index 000000000..25a8cc38a
--- /dev/null
+++ b/doc/guides/prog_guide/stack_lib.rst
@@ -0,0 +1,28 @@
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright(c) 2019 Intel Corporation.
+
+Stack Library
+=============
+
+DPDK's stack library provides an API for configuration and use of a bounded
+stack of pointers.
+
+The stack library provides the following basic operations:
+
+*  Create a uniquely named stack of a user-specified size and using a
+   user-specified socket.
+
+*  Push and pop a burst of one or more stack objects (pointers). These function
+   are multi-threading safe.
+
+*  Free a previously created stack.
+
+*  Lookup a pointer to a stack by its name.
+
+*  Query a stack's current depth and number of free entries.
+
+Implementation
+~~~~~~~~~~~~~~
+
+The stack consists of a contiguous array of pointers, a current index, and a
+spinlock. Accesses to the stack are made multi-thread safe by the spinlock.
diff --git a/doc/guides/rel_notes/release_19_05.rst b/doc/guides/rel_notes/release_19_05.rst
index bdad1ddbe..ebfbe36e5 100644
--- a/doc/guides/rel_notes/release_19_05.rst
+++ b/doc/guides/rel_notes/release_19_05.rst
@@ -121,6 +121,11 @@ New Features
   Improved testpmd application performance on ARM platform. For ``macswap``
   forwarding mode, NEON intrinsics were used to do swap to save CPU cycles.
 
+* **Added Stack API.**
+
+  Added a new stack API for configuration and use of a bounded stack of
+  pointers. The API provides MT-safe push and pop operations that can operate
+  on one or more pointers per operation.
 
 Removed Items
 -------------
diff --git a/lib/Makefile b/lib/Makefile
index a358f1c19..9f90e80ad 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -109,6 +109,8 @@ DIRS-$(CONFIG_RTE_LIBRTE_IPSEC) += librte_ipsec
 DEPDIRS-librte_ipsec := librte_eal librte_mbuf librte_cryptodev librte_security
 DIRS-$(CONFIG_RTE_LIBRTE_TELEMETRY) += librte_telemetry
 DEPDIRS-librte_telemetry := librte_eal librte_metrics librte_ethdev
+DIRS-$(CONFIG_RTE_LIBRTE_STACK) += librte_stack
+DEPDIRS-librte_stack := librte_eal
 
 ifeq ($(CONFIG_RTE_EXEC_ENV_LINUX),y)
 DIRS-$(CONFIG_RTE_LIBRTE_KNI) += librte_kni
diff --git a/lib/librte_stack/Makefile b/lib/librte_stack/Makefile
new file mode 100644
index 000000000..6db540073
--- /dev/null
+++ b/lib/librte_stack/Makefile
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2019 Intel Corporation
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# library name
+LIB = librte_stack.a
+
+CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR) -O3
+CFLAGS += -DALLOW_EXPERIMENTAL_API
+LDLIBS += -lrte_eal
+
+EXPORT_MAP := rte_stack_version.map
+
+LIBABIVER := 1
+
+# all source are stored in SRCS-y
+SRCS-$(CONFIG_RTE_LIBRTE_STACK) := rte_stack.c \
+				   rte_stack_std.c
+
+# install includes
+SYMLINK-$(CONFIG_RTE_LIBRTE_STACK)-include := rte_stack.h \
+					      rte_stack_std.h
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_stack/meson.build b/lib/librte_stack/meson.build
new file mode 100644
index 000000000..d2e60ce9b
--- /dev/null
+++ b/lib/librte_stack/meson.build
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2019 Intel Corporation
+
+allow_experimental_apis = true
+
+version = 1
+sources = files('rte_stack.c', 'rte_stack_std.c')
+headers = files('rte_stack.h', 'rte_stack_std.h')
diff --git a/lib/librte_stack/rte_stack.c b/lib/librte_stack/rte_stack.c
new file mode 100644
index 000000000..610014b6c
--- /dev/null
+++ b/lib/librte_stack/rte_stack.c
@@ -0,0 +1,182 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Intel Corporation
+ */
+
+#include <string.h>
+
+#include <rte_atomic.h>
+#include <rte_eal.h>
+#include <rte_eal_memconfig.h>
+#include <rte_errno.h>
+#include <rte_malloc.h>
+#include <rte_memzone.h>
+#include <rte_rwlock.h>
+#include <rte_tailq.h>
+
+#include "rte_stack.h"
+#include "rte_stack_pvt.h"
+
+int stack_logtype;
+
+TAILQ_HEAD(rte_stack_list, rte_tailq_entry);
+
+static struct rte_tailq_elem rte_stack_tailq = {
+	.name = RTE_TAILQ_STACK_NAME,
+};
+EAL_REGISTER_TAILQ(rte_stack_tailq)
+
+static void
+rte_stack_init(struct rte_stack *s)
+{
+	memset(s, 0, sizeof(*s));
+
+	rte_stack_std_init(s);
+}
+
+static ssize_t
+rte_stack_get_memsize(unsigned int count)
+{
+	return rte_stack_std_get_memsize(count);
+}
+
+struct rte_stack *
+rte_stack_create(const char *name, unsigned int count, int socket_id,
+		 uint32_t flags)
+{
+	char mz_name[RTE_MEMZONE_NAMESIZE];
+	struct rte_stack_list *stack_list;
+	const struct rte_memzone *mz;
+	struct rte_tailq_entry *te;
+	struct rte_stack *s;
+	unsigned int sz;
+	int ret;
+
+	RTE_SET_USED(flags);
+
+	sz = rte_stack_get_memsize(count);
+
+	ret = snprintf(mz_name, sizeof(mz_name), "%s%s",
+		       RTE_STACK_MZ_PREFIX, name);
+	if (ret < 0 || ret >= (int)sizeof(mz_name)) {
+		rte_errno = ENAMETOOLONG;
+		return NULL;
+	}
+
+	te = rte_zmalloc("STACK_TAILQ_ENTRY", sizeof(*te), 0);
+	if (te == NULL) {
+		STACK_LOG_ERR("Cannot reserve memory for tailq\n");
+		rte_errno = ENOMEM;
+		return NULL;
+	}
+
+	rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+
+	mz = rte_memzone_reserve_aligned(mz_name, sz, socket_id,
+					 0, __alignof__(*s));
+	if (mz == NULL) {
+		STACK_LOG_ERR("Cannot reserve stack memzone!\n");
+		rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+		rte_free(te);
+		return NULL;
+	}
+
+	s = mz->addr;
+
+	rte_stack_init(s);
+
+	/* Store the name for later lookups */
+	ret = snprintf(s->name, sizeof(s->name), "%s", name);
+	if (ret < 0 || ret >= (int)sizeof(s->name)) {
+		rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+		rte_errno = ENAMETOOLONG;
+		rte_free(te);
+		rte_memzone_free(mz);
+		return NULL;
+	}
+
+	s->memzone = mz;
+	s->capacity = count;
+	s->flags = flags;
+
+	te->data = s;
+
+	stack_list = RTE_TAILQ_CAST(rte_stack_tailq.head, rte_stack_list);
+
+	TAILQ_INSERT_TAIL(stack_list, te, next);
+
+	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+	return s;
+}
+
+void
+rte_stack_free(struct rte_stack *s)
+{
+	struct rte_stack_list *stack_list;
+	struct rte_tailq_entry *te;
+
+	if (s == NULL)
+		return;
+
+	stack_list = RTE_TAILQ_CAST(rte_stack_tailq.head, rte_stack_list);
+	rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+
+	/* find out tailq entry */
+	TAILQ_FOREACH(te, stack_list, next) {
+		if (te->data == s)
+			break;
+	}
+
+	if (te == NULL) {
+		rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+		return;
+	}
+
+	TAILQ_REMOVE(stack_list, te, next);
+
+	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+	rte_free(te);
+
+	rte_memzone_free(s->memzone);
+}
+
+struct rte_stack *
+rte_stack_lookup(const char *name)
+{
+	struct rte_stack_list *stack_list;
+	struct rte_tailq_entry *te;
+	struct rte_stack *r = NULL;
+
+	if (name == NULL) {
+		rte_errno = EINVAL;
+		return NULL;
+	}
+
+	stack_list = RTE_TAILQ_CAST(rte_stack_tailq.head, rte_stack_list);
+
+	rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
+
+	TAILQ_FOREACH(te, stack_list, next) {
+		r = (struct rte_stack *) te->data;
+		if (strncmp(name, r->name, RTE_STACK_NAMESIZE) == 0)
+			break;
+	}
+
+	rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+	if (te == NULL) {
+		rte_errno = ENOENT;
+		return NULL;
+	}
+
+	return r;
+}
+
+RTE_INIT(librte_stack_init_log)
+{
+	stack_logtype = rte_log_register("lib.stack");
+	if (stack_logtype >= 0)
+		rte_log_set_level(stack_logtype, RTE_LOG_NOTICE);
+}
diff --git a/lib/librte_stack/rte_stack.h b/lib/librte_stack/rte_stack.h
new file mode 100644
index 000000000..d9799d747
--- /dev/null
+++ b/lib/librte_stack/rte_stack.h
@@ -0,0 +1,207 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Intel Corporation
+ */
+
+/**
+ * @file rte_stack.h
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * RTE Stack
+ *
+ * librte_stack provides an API for configuration and use of a bounded stack of
+ * pointers. Push and pop operations are MT-safe, allowing concurrent access,
+ * and the interface supports pushing and popping multiple pointers at a time.
+ */
+
+#ifndef _RTE_STACK_H_
+#define _RTE_STACK_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_errno.h>
+#include <rte_memzone.h>
+#include <rte_spinlock.h>
+
+#define RTE_TAILQ_STACK_NAME "RTE_STACK"
+#define RTE_STACK_MZ_PREFIX "STK_"
+/** The maximum length of a stack name. */
+#define RTE_STACK_NAMESIZE (RTE_MEMZONE_NAMESIZE - \
+			   sizeof(RTE_STACK_MZ_PREFIX) + 1)
+
+/* Structure containing the LIFO, its current length, and a lock for mutual
+ * exclusion.
+ */
+struct rte_stack_std {
+	rte_spinlock_t lock; /**< LIFO lock */
+	uint32_t len; /**< LIFO len */
+	void *objs[]; /**< LIFO pointer table */
+};
+
+/* The RTE stack structure contains the LIFO structure itself, plus metadata
+ * such as its name and memzone pointer.
+ */
+struct rte_stack {
+	/** Name of the stack. */
+	char name[RTE_STACK_NAMESIZE] __rte_cache_aligned;
+	/** Memzone containing the rte_stack structure. */
+	const struct rte_memzone *memzone;
+	uint32_t capacity; /**< Usable size of the stack. */
+	uint32_t flags; /**< Flags supplied at creation. */
+	struct rte_stack_std stack_std; /**< LIFO structure. */
+} __rte_cache_aligned;
+
+#include "rte_stack_std.h"
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Push several objects on the stack (MT-safe).
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to push on the stack from the obj_table.
+ * @return
+ *   Actual number of objects pushed (either 0 or *n*).
+ */
+static __rte_always_inline unsigned int __rte_experimental
+rte_stack_push(struct rte_stack *s, void * const *obj_table, unsigned int n)
+{
+	RTE_ASSERT(s != NULL);
+	RTE_ASSERT(obj_table != NULL);
+
+	return __rte_stack_std_push(s, obj_table, n);
+}
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Pop several objects from the stack (MT-safe).
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to pull from the stack.
+ * @return
+ *   Actual number of objects popped (either 0 or *n*).
+ */
+static __rte_always_inline unsigned int __rte_experimental
+rte_stack_pop(struct rte_stack *s, void **obj_table, unsigned int n)
+{
+	RTE_ASSERT(s != NULL);
+	RTE_ASSERT(obj_table != NULL);
+
+	return __rte_stack_std_pop(s, obj_table, n);
+}
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Return the number of used entries in a stack.
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ * @return
+ *   The number of used entries in the stack.
+ */
+static __rte_always_inline unsigned int __rte_experimental
+rte_stack_count(struct rte_stack *s)
+{
+	RTE_ASSERT(s != NULL);
+
+	return __rte_stack_std_count(s);
+}
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Return the number of free entries in a stack.
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ * @return
+ *   The number of free entries in the stack.
+ */
+static __rte_always_inline unsigned int __rte_experimental
+rte_stack_free_count(struct rte_stack *s)
+{
+	RTE_ASSERT(s != NULL);
+
+	return s->capacity - rte_stack_count(s);
+}
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Create a new stack named *name* in memory.
+ *
+ * This function uses ``memzone_reserve()`` to allocate memory for a stack of
+ * size *count*. The behavior of the stack is controlled by the *flags*.
+ *
+ * @param name
+ *   The name of the stack.
+ * @param count
+ *   The size of the stack.
+ * @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
+ *   Reserved for future use.
+ * @return
+ *   On success, the pointer to the new allocated stack. NULL on error with
+ *    rte_errno set appropriately. Possible errno values include:
+ *    - ENOSPC - the maximum number of memzones has already been allocated
+ *    - EEXIST - a stack with the same name already exists
+ *    - ENOMEM - insufficient memory to create the stack
+ *    - ENAMETOOLONG - name size exceeds RTE_STACK_NAMESIZE
+ */
+struct rte_stack *__rte_experimental
+rte_stack_create(const char *name, unsigned int count, int socket_id,
+		 uint32_t flags);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Free all memory used by the stack.
+ *
+ * @param s
+ *   Stack to free
+ */
+void __rte_experimental
+rte_stack_free(struct rte_stack *s);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Lookup a stack by its name.
+ *
+ * @param name
+ *   The name of the stack.
+ * @return
+ *   The pointer to the stack matching the name, or NULL if not found,
+ *   with rte_errno set appropriately. Possible rte_errno values include:
+ *    - ENOENT - Stack with name *name* not found.
+ *    - EINVAL - *name* pointer is NULL.
+ */
+struct rte_stack * __rte_experimental
+rte_stack_lookup(const char *name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_STACK_H_ */
diff --git a/lib/librte_stack/rte_stack_pvt.h b/lib/librte_stack/rte_stack_pvt.h
new file mode 100644
index 000000000..4a6a7bdb3
--- /dev/null
+++ b/lib/librte_stack/rte_stack_pvt.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Intel Corporation
+ */
+
+#ifndef _RTE_STACK_PVT_H_
+#define _RTE_STACK_PVT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_log.h>
+
+extern int stack_logtype;
+
+#define STACK_LOG(level, fmt, args...) \
+	rte_log(RTE_LOG_ ##level, stack_logtype, "%s(): "fmt "\n", \
+		__func__, ##args)
+
+#define STACK_LOG_ERR(fmt, args...) \
+	STACK_LOG(ERR, fmt, ## args)
+
+#define STACK_LOG_WARN(fmt, args...) \
+	STACK_LOG(WARNING, fmt, ## args)
+
+#define STACK_LOG_INFO(fmt, args...) \
+	STACK_LOG(INFO, fmt, ## args)
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_STACK_PVT_H_ */
diff --git a/lib/librte_stack/rte_stack_std.c b/lib/librte_stack/rte_stack_std.c
new file mode 100644
index 000000000..0a310d7c6
--- /dev/null
+++ b/lib/librte_stack/rte_stack_std.c
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Intel Corporation
+ */
+
+#include "rte_stack.h"
+
+void
+rte_stack_std_init(struct rte_stack *s)
+{
+	rte_spinlock_init(&s->stack_std.lock);
+}
+
+ssize_t
+rte_stack_std_get_memsize(unsigned int count)
+{
+	ssize_t sz = sizeof(struct rte_stack);
+
+	sz += RTE_CACHE_LINE_ROUNDUP(count * sizeof(void *));
+
+	/* Add padding to avoid false sharing conflicts caused by
+	 * next-line hardware prefetchers.
+	 */
+	sz += 2 * RTE_CACHE_LINE_SIZE;
+
+	return sz;
+}
diff --git a/lib/librte_stack/rte_stack_std.h b/lib/librte_stack/rte_stack_std.h
new file mode 100644
index 000000000..f9af087dc
--- /dev/null
+++ b/lib/librte_stack/rte_stack_std.h
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Intel Corporation
+ */
+
+#ifndef _RTE_STACK_STD_H_
+#define _RTE_STACK_STD_H_
+
+/**
+ * @internal Push several objects on the stack (MT-safe).
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to push on the stack from the obj_table.
+ * @return
+ *   Actual number of objects pushed (either 0 or *n*).
+ */
+static __rte_always_inline unsigned int __rte_experimental
+__rte_stack_std_push(struct rte_stack *s, void * const *obj_table,
+		     unsigned int n)
+{
+	struct rte_stack_std *stack = &s->stack_std;
+	unsigned int index;
+	void **cache_objs;
+
+	rte_spinlock_lock(&stack->lock);
+	cache_objs = &stack->objs[stack->len];
+
+	/* Is there sufficient space in the stack? */
+	if ((stack->len + n) > s->capacity) {
+		rte_spinlock_unlock(&stack->lock);
+		return 0;
+	}
+
+	/* Add elements back into the cache */
+	for (index = 0; index < n; ++index, obj_table++)
+		cache_objs[index] = *obj_table;
+
+	stack->len += n;
+
+	rte_spinlock_unlock(&stack->lock);
+	return n;
+}
+
+/**
+ * @internal Pop several objects from the stack (MT-safe).
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ * @param obj_table
+ *   A pointer to a table of void * pointers (objects).
+ * @param n
+ *   The number of objects to pull from the stack.
+ * @return
+ *   Actual number of objects popped (either 0 or *n*).
+ */
+static __rte_always_inline unsigned int __rte_experimental
+__rte_stack_std_pop(struct rte_stack *s, void **obj_table, unsigned int n)
+{
+	struct rte_stack_std *stack = &s->stack_std;
+	unsigned int index, len;
+	void **cache_objs;
+
+	rte_spinlock_lock(&stack->lock);
+
+	if (unlikely(n > stack->len)) {
+		rte_spinlock_unlock(&stack->lock);
+		return 0;
+	}
+
+	cache_objs = stack->objs;
+
+	for (index = 0, len = stack->len - 1; index < n;
+			++index, len--, obj_table++)
+		*obj_table = cache_objs[len];
+
+	stack->len -= n;
+	rte_spinlock_unlock(&stack->lock);
+
+	return n;
+}
+
+/**
+ * @internal Return the number of used entries in a stack.
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ * @return
+ *   The number of used entries in the stack.
+ */
+static __rte_always_inline unsigned int __rte_experimental
+__rte_stack_std_count(struct rte_stack *s)
+{
+	return (unsigned int)s->stack_std.len;
+}
+
+/**
+ * @internal Initialize a standard stack.
+ *
+ * @param s
+ *   A pointer to the stack structure.
+ */
+void
+rte_stack_std_init(struct rte_stack *s);
+
+/**
+ * @internal Return the memory required for a standard stack.
+ *
+ * @param count
+ *   The size of the stack.
+ * @return
+ *   The bytes to allocate for a standard stack.
+ */
+ssize_t
+rte_stack_std_get_memsize(unsigned int count);
+
+#endif /* _RTE_STACK_STD_H_ */
diff --git a/lib/librte_stack/rte_stack_version.map b/lib/librte_stack/rte_stack_version.map
new file mode 100644
index 000000000..6662679c3
--- /dev/null
+++ b/lib/librte_stack/rte_stack_version.map
@@ -0,0 +1,9 @@
+EXPERIMENTAL {
+	global:
+
+	rte_stack_create;
+	rte_stack_free;
+	rte_stack_lookup;
+
+	local: *;
+};
diff --git a/lib/meson.build b/lib/meson.build
index 99957ba7d..90115477f 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -22,7 +22,7 @@ libraries = [
 	'gro', 'gso', 'ip_frag', 'jobstats',
 	'kni', 'latencystats', 'lpm', 'member',
 	'power', 'pdump', 'rawdev',
-	'reorder', 'sched', 'security', 'vhost',
+	'reorder', 'sched', 'security', 'stack', 'vhost',
 	#ipsec lib depends on crypto and security
 	'ipsec',
 	# add pkt framework libs which use other libs from above
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 262132fc6..7e033e78c 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -87,6 +87,7 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_SECURITY)       += -lrte_security
 _LDLIBS-$(CONFIG_RTE_LIBRTE_COMPRESSDEV)    += -lrte_compressdev
 _LDLIBS-$(CONFIG_RTE_LIBRTE_EVENTDEV)       += -lrte_eventdev
 _LDLIBS-$(CONFIG_RTE_LIBRTE_RAWDEV)         += -lrte_rawdev
+_LDLIBS-$(CONFIG_RTE_LIBRTE_STACK)          += -lrte_stack
 _LDLIBS-$(CONFIG_RTE_LIBRTE_TIMER)          += -lrte_timer
 _LDLIBS-$(CONFIG_RTE_LIBRTE_MEMPOOL)        += -lrte_mempool
 _LDLIBS-$(CONFIG_RTE_DRIVER_MEMPOOL_RING)   += -lrte_mempool_ring
-- 
2.13.6