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-rw-r--r--MAINTAINERS6
-rw-r--r--config/common_base5
-rw-r--r--doc/api/doxy-api-index.md1
-rw-r--r--doc/api/doxy-api.conf.in1
-rw-r--r--doc/guides/prog_guide/index.rst1
-rw-r--r--doc/guides/prog_guide/stack_lib.rst28
-rw-r--r--doc/guides/rel_notes/release_19_05.rst7
-rw-r--r--lib/Makefile2
-rw-r--r--lib/librte_stack/Makefile25
-rw-r--r--lib/librte_stack/meson.build8
-rw-r--r--lib/librte_stack/rte_stack.c182
-rw-r--r--lib/librte_stack/rte_stack.h209
-rw-r--r--lib/librte_stack/rte_stack_pvt.h34
-rw-r--r--lib/librte_stack/rte_stack_std.c26
-rw-r--r--lib/librte_stack/rte_stack_std.h121
-rw-r--r--lib/librte_stack/rte_stack_version.map9
-rw-r--r--lib/meson.build2
-rw-r--r--mk/rte.app.mk1
18 files changed, 667 insertions, 1 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 71ac8cd..b59f781 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -315,6 +315,12 @@ F: doc/guides/prog_guide/ring_lib.rst
F: app/test/test_ring*
F: app/test/test_func_reentrancy.c
+Stack - 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
+
Packet buffer
M: Olivier Matz <olivier.matz@6wind.com>
F: lib/librte_mbuf/
diff --git a/config/common_base b/config/common_base
index a0a9fe0..9b4d4d5 100644
--- a/config/common_base
+++ b/config/common_base
@@ -733,6 +733,11 @@ CONFIG_RTE_LIBRTE_PMD_IFPGA_RAWDEV=y
CONFIG_RTE_LIBRTE_RING=y
#
+# Compile librte_stack
+#
+CONFIG_RTE_LIBRTE_STACK=y
+
+#
# Compile librte_mempool
#
CONFIG_RTE_LIBRTE_MEMPOOL=y
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index aacc66b..de1e215 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 a365e66..7722fc3 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 6726b1e..95f5e79 100644
--- a/doc/guides/prog_guide/index.rst
+++ b/doc/guides/prog_guide/index.rst
@@ -13,6 +13,7 @@ Programmer's Guide
env_abstraction_layer
service_cores
ring_lib
+ stack_lib
mempool_lib
mbuf_lib
poll_mode_drv
diff --git a/doc/guides/prog_guide/stack_lib.rst b/doc/guides/prog_guide/stack_lib.rst
new file mode 100644
index 0000000..25a8cc3
--- /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 321a8b4..4d59397 100644
--- a/doc/guides/rel_notes/release_19_05.rst
+++ b/doc/guides/rel_notes/release_19_05.rst
@@ -54,6 +54,12 @@ New Features
Also, make sure to start the actual text at the margin.
=========================================================
+* **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.
+
* **Updated KNI module and PMD.**
Updated the KNI kernel module to set the max_mtu according to the given
@@ -264,6 +270,7 @@ The libraries prepended with a plus sign were incremented in this version.
librte_ring.so.2
librte_sched.so.2
librte_security.so.2
+ + librte_stack.so.1
librte_table.so.3
librte_timer.so.1
librte_vhost.so.4
diff --git a/lib/Makefile b/lib/Makefile
index a358f1c..26021d0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -10,6 +10,8 @@ DIRS-$(CONFIG_RTE_LIBRTE_PCI) += librte_pci
DEPDIRS-librte_pci := librte_eal
DIRS-$(CONFIG_RTE_LIBRTE_RING) += librte_ring
DEPDIRS-librte_ring := librte_eal
+DIRS-$(CONFIG_RTE_LIBRTE_STACK) += librte_stack
+DEPDIRS-librte_stack := librte_eal
DIRS-$(CONFIG_RTE_LIBRTE_MEMPOOL) += librte_mempool
DEPDIRS-librte_mempool := librte_eal librte_ring
DIRS-$(CONFIG_RTE_LIBRTE_MBUF) += librte_mbuf
diff --git a/lib/librte_stack/Makefile b/lib/librte_stack/Makefile
new file mode 100644
index 0000000..6db5400
--- /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 0000000..d2e60ce
--- /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 0000000..610014b
--- /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 0000000..42d0427
--- /dev/null
+++ b/lib/librte_stack/rte_stack.h
@@ -0,0 +1,209 @@
+/* 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_compat.h>
+#include <rte_debug.h>
+#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 0000000..4a6a7bd
--- /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 0000000..0a310d7
--- /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 0000000..5dc9409
--- /dev/null
+++ b/lib/librte_stack/rte_stack_std.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Intel Corporation
+ */
+
+#ifndef _RTE_STACK_STD_H_
+#define _RTE_STACK_STD_H_
+
+#include <rte_branch_prediction.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 0000000..6662679
--- /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 c3289f8..595314d 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 e13f247..6c6bb4b 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -89,6 +89,7 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_EVENTDEV) += -lrte_eventdev
_LDLIBS-$(CONFIG_RTE_LIBRTE_RAWDEV) += -lrte_rawdev
_LDLIBS-$(CONFIG_RTE_LIBRTE_TIMER) += -lrte_timer
_LDLIBS-$(CONFIG_RTE_LIBRTE_MEMPOOL) += -lrte_mempool
+_LDLIBS-$(CONFIG_RTE_LIBRTE_STACK) += -lrte_stack
_LDLIBS-$(CONFIG_RTE_DRIVER_MEMPOOL_RING) += -lrte_mempool_ring
_LDLIBS-$(CONFIG_RTE_LIBRTE_RING) += -lrte_ring
_LDLIBS-$(CONFIG_RTE_LIBRTE_PCI) += -lrte_pci