rte_stack.h File Reference

#include <stdalign.h>
#include <rte_debug.h>
#include <rte_errno.h>
#include <rte_memzone.h>
#include <rte_spinlock.h>
#include "rte_stack_std.h"
#include "rte_stack_lf.h"

Go to the source code of this file.

Macros
#define	RTE_STACK_NAMESIZE
#define	RTE_STACK_F_LF   0x0001

Functions
static __rte_always_inline unsigned int	rte_stack_push (struct rte_stack *s, void *const *obj_table, unsigned int n)
static __rte_always_inline unsigned int	rte_stack_pop (struct rte_stack *s, void **obj_table, unsigned int n)
static __rte_always_inline unsigned int	rte_stack_count (struct rte_stack *s)
static __rte_always_inline unsigned int	rte_stack_free_count (struct rte_stack *s)
struct rte_stack *	rte_stack_create (const char *name, unsigned int count, int socket_id, uint32_t flags)
void	rte_stack_free (struct rte_stack *s)
struct rte_stack *	rte_stack_lookup (const char *name)

Detailed Description

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.

Definition in file rte_stack.h.

Macro Definition Documentation

RTE_STACK_NAMESIZE

#define RTE_STACK_NAMESIZE

Value:

(RTE_MEMZONE_NAMESIZE - \
               sizeof(RTE_STACK_MZ_PREFIX) + 1)

The maximum length of a stack name.

Definition at line 28 of file rte_stack.h.

RTE_STACK_F_LF

#define RTE_STACK_F_LF   0x0001

The stack uses lock-free push and pop functions. This flag is only supported on x86_64 or arm64 platforms, currently.

Definition at line 89 of file rte_stack.h.

Function Documentation

rte_stack_push()

static __rte_always_inline unsigned int rte_stack_push ( struct rte_stack *  s, void *const *  obj_table, unsigned int  n  )

static

Push several objects on the stack (MT-safe).

Parameters

s	A pointer to the stack structure.
obj_table	A pointer to a table of void * pointers (objects).
n	The number of objects to push on the stack from the obj_table.

Returns

Actual number of objects pushed (either 0 or n).

Definition at line 111 of file rte_stack.h.

rte_stack_pop()

static __rte_always_inline unsigned int rte_stack_pop ( struct rte_stack *  s, void **  obj_table, unsigned int  n  )

static

Pop several objects from the stack (MT-safe).

Parameters

s	A pointer to the stack structure.
obj_table	A pointer to a table of void * pointers (objects).
n	The number of objects to pull from the stack.

Returns

Actual number of objects popped (either 0 or n).

Definition at line 135 of file rte_stack.h.

rte_stack_count()

static __rte_always_inline unsigned int rte_stack_count ( struct rte_stack *  s )

static

Return the number of used entries in a stack.

Parameters

s	A pointer to the stack structure.

Returns

The number of used entries in the stack.

Definition at line 155 of file rte_stack.h.

rte_stack_free_count()

static __rte_always_inline unsigned int rte_stack_free_count ( struct rte_stack *  s )

static

Return the number of free entries in a stack.

Parameters

s	A pointer to the stack structure.

Returns

The number of free entries in the stack.

Definition at line 174 of file rte_stack.h.

rte_stack_create()

struct rte_stack* rte_stack_create	(	const char *	name,
		unsigned int	count,
		int	socket_id,
		uint32_t	flags
	)

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.

Parameters

name	The name of the stack.
count	The size of the stack.
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.
flags	An OR of the following: RTE_STACK_F_LF: If this flag is set, the stack uses lock-free variants of the push and pop functions. Otherwise, it achieves thread-safety using a lock.

Returns

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
• ENOTSUP - platform does not support given flags combination.

rte_stack_free()

void rte_stack_free

(

struct rte_stack *

s

)

Free all memory used by the stack.

Parameters

s	Pointer to stack created with rte_stack_create(). If s is NULL, no operation is performed.

rte_stack_lookup()

struct rte_stack* rte_stack_lookup

(

const char *

name

)

Lookup a stack by its name.

Parameters

name	The name of the stack.

Returns

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.