rte_ring_elem.h File Reference

#include <rte_ring_core.h>
#include <rte_ring_elem_pvt.h>
#include <rte_ring_hts.h>
#include <rte_ring_rts.h>
#include <rte_ring_peek.h>
#include <rte_ring_peek_zc.h>
#include <rte_ring.h>

Go to the source code of this file.

Functions
ssize_t	rte_ring_get_memsize_elem (unsigned int esize, unsigned int count)
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 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)
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)
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)
static __rte_always_inline int	rte_ring_mp_enqueue_elem (struct rte_ring *r, void *obj, unsigned int esize)
static __rte_always_inline int	rte_ring_sp_enqueue_elem (struct rte_ring *r, void *obj, unsigned int esize)
static __rte_always_inline int	rte_ring_enqueue_elem (struct rte_ring *r, void *obj, unsigned int esize)
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)
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)
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)
static __rte_always_inline int	rte_ring_mc_dequeue_elem (struct rte_ring *r, void *obj_p, unsigned int esize)
static __rte_always_inline int	rte_ring_sc_dequeue_elem (struct rte_ring *r, void *obj_p, unsigned int esize)
static __rte_always_inline int	rte_ring_dequeue_elem (struct rte_ring *r, void *obj_p, unsigned int esize)
static __rte_always_inline unsigned int	rte_ring_mp_enqueue_burst_elem (struct rte_ring *r, const void *obj_table, unsigned int esize, unsigned int n, unsigned int *free_space)
static __rte_always_inline unsigned int	rte_ring_sp_enqueue_burst_elem (struct rte_ring *r, const void *obj_table, unsigned int esize, unsigned int n, unsigned int *free_space)
static __rte_always_inline unsigned int	rte_ring_enqueue_burst_elem (struct rte_ring *r, const void *obj_table, unsigned int esize, unsigned int n, unsigned int *free_space)
static __rte_always_inline unsigned int	rte_ring_mc_dequeue_burst_elem (struct rte_ring *r, void *obj_table, unsigned int esize, unsigned int n, unsigned int *available)
static __rte_always_inline unsigned int	rte_ring_sc_dequeue_burst_elem (struct rte_ring *r, void *obj_table, unsigned int esize, unsigned int n, unsigned int *available)
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)

Detailed Description

RTE Ring with user defined element size

Definition in file rte_ring_elem.h.

Function Documentation

rte_ring_get_memsize_elem()

ssize_t rte_ring_get_memsize_elem	(	unsigned int	esize,
		unsigned int	count
	)

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.

Parameters

esize	The size of ring element, in bytes. It must be a multiple of 4.
count	The number of elements in the ring (must be a power of 2).

Returns

• 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_ring_create_elem()

struct rte_ring* rte_ring_create_elem	(	const char *	name,
		unsigned int	esize,
		unsigned int	count,
		int	socket_id,
		unsigned int	flags
	)

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 full ring from an empty ring.

The ring is added in RTE_TAILQ_RING list.

Parameters

name	The name of the ring.
esize	The size of ring element, in bytes. It must be a multiple of 4.
count	The number of elements in the ring (must be a power of 2).
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: 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.

Returns

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_ring_mp_enqueue_bulk_elem()

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  )

static

Enqueue several objects on the ring (multi-producers safe).

This function uses a "compare and set" instruction to move the producer index atomically.

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects.
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.
n	The number of objects to add in the ring from the obj_table.
free_space	if non-NULL, returns the amount of space in the ring after the enqueue operation has finished.

Returns

The number of objects enqueued, either 0 or n

Definition at line 132 of file rte_ring_elem.h.

rte_ring_sp_enqueue_bulk_elem()

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  )

static

Enqueue several objects on a ring

Warning

This API is NOT multi-producers safe

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects.
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.
n	The number of objects to add in the ring from the obj_table.
free_space	if non-NULL, returns the amount of space in the ring after the enqueue operation has finished.

Returns

The number of objects enqueued, either 0 or n

Definition at line 161 of file rte_ring_elem.h.

rte_ring_enqueue_bulk_elem()

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  )

static

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).

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects.
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.
n	The number of objects to add in the ring from the obj_table.
free_space	if non-NULL, returns the amount of space in the ring after the enqueue operation has finished.

Returns

The number of objects enqueued, either 0 or n

Definition at line 195 of file rte_ring_elem.h.

rte_ring_mp_enqueue_elem()

static __rte_always_inline int rte_ring_mp_enqueue_elem ( struct rte_ring *  r, void *  obj, unsigned int  esize  )

static

Enqueue one object on a ring (multi-producers safe).

This function uses a "compare and set" instruction to move the producer index atomically.

Parameters

r	A pointer to the ring structure.
obj	A pointer to the object to be added.
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.

Returns

• 0: Success; objects enqueued.
• -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.

Definition at line 239 of file rte_ring_elem.h.

rte_ring_sp_enqueue_elem()

static __rte_always_inline int rte_ring_sp_enqueue_elem ( struct rte_ring *  r, void *  obj, unsigned int  esize  )

static

Enqueue one object on a ring

Warning

This API is NOT multi-producers safe

Parameters

r	A pointer to the ring structure.
obj	A pointer to the object to be added.
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.

Returns

• 0: Success; objects enqueued.
• -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.

Definition at line 263 of file rte_ring_elem.h.

rte_ring_enqueue_elem()

static __rte_always_inline int rte_ring_enqueue_elem ( struct rte_ring *  r, void *  obj, unsigned int  esize  )

static

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).

Parameters

r	A pointer to the ring structure.
obj	A pointer to the object to be added.
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.

Returns

• 0: Success; objects enqueued.
• -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.

Definition at line 289 of file rte_ring_elem.h.

rte_ring_mc_dequeue_bulk_elem()

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  )

static

Dequeue several objects from a ring (multi-consumers safe).

This function uses a "compare and set" instruction to move the consumer index atomically.

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects that will be filled.
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.
n	The number of objects to dequeue from the ring to the obj_table.
available	If non-NULL, returns the number of remaining ring entries after the dequeue has finished.

Returns

The number of objects dequeued, either 0 or n

Definition at line 318 of file rte_ring_elem.h.

rte_ring_sc_dequeue_bulk_elem()

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  )

static

Dequeue several objects from a ring (NOT multi-consumers safe).

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects that will be filled.
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.
n	The number of objects to dequeue from the ring to the obj_table, must be strictly positive.
available	If non-NULL, returns the number of remaining ring entries after the dequeue has finished.

Returns

The number of objects dequeued, either 0 or n

Definition at line 346 of file rte_ring_elem.h.

rte_ring_dequeue_bulk_elem()

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  )

static

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).

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects that will be filled.
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.
n	The number of objects to dequeue from the ring to the obj_table.
available	If non-NULL, returns the number of remaining ring entries after the dequeue has finished.

Returns

The number of objects dequeued, either 0 or n

Definition at line 377 of file rte_ring_elem.h.

rte_ring_mc_dequeue_elem()

static __rte_always_inline int rte_ring_mc_dequeue_elem ( struct rte_ring *  r, void *  obj_p, unsigned int  esize  )

static

Dequeue one object from a ring (multi-consumers safe).

This function uses a "compare and set" instruction to move the consumer index atomically.

Parameters

r	A pointer to the ring structure.
obj_p	A pointer to the object that will be filled.
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.

Returns

• 0: Success; objects dequeued.
• -ENOENT: Not enough entries in the ring to dequeue; no object is dequeued.

Definition at line 422 of file rte_ring_elem.h.

rte_ring_sc_dequeue_elem()

static __rte_always_inline int rte_ring_sc_dequeue_elem ( struct rte_ring *  r, void *  obj_p, unsigned int  esize  )

static

Dequeue one object from a ring (NOT multi-consumers safe).

Parameters

r	A pointer to the ring structure.
obj_p	A pointer to the object that will be filled.
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.

Returns

• 0: Success; objects dequeued.
• -ENOENT: Not enough entries in the ring to dequeue, no object is dequeued.

Definition at line 446 of file rte_ring_elem.h.

rte_ring_dequeue_elem()

static __rte_always_inline int rte_ring_dequeue_elem ( struct rte_ring *  r, void *  obj_p, unsigned int  esize  )

static

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).

Parameters

r	A pointer to the ring structure.
obj_p	A pointer to the object that will be filled.
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.

Returns

• 0: Success, objects dequeued.
• -ENOENT: Not enough entries in the ring to dequeue, no object is dequeued.

Definition at line 474 of file rte_ring_elem.h.

rte_ring_mp_enqueue_burst_elem()

static __rte_always_inline unsigned int rte_ring_mp_enqueue_burst_elem ( struct rte_ring *  r, const void *  obj_table, unsigned int  esize, unsigned int  n, unsigned int *  free_space  )

static

Enqueue several objects on the ring (multi-producers safe).

This function uses a "compare and set" instruction to move the producer index atomically.

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects.
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.
n	The number of objects to add in the ring from the obj_table.
free_space	if non-NULL, returns the amount of space in the ring after the enqueue operation has finished.

Returns

• n: Actual number of objects enqueued.

Definition at line 503 of file rte_ring_elem.h.

rte_ring_sp_enqueue_burst_elem()

static __rte_always_inline unsigned int rte_ring_sp_enqueue_burst_elem ( struct rte_ring *  r, const void *  obj_table, unsigned int  esize, unsigned int  n, unsigned int *  free_space  )

static

Enqueue several objects on a ring

Warning

This API is NOT multi-producers safe

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects.
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.
n	The number of objects to add in the ring from the obj_table.
free_space	if non-NULL, returns the amount of space in the ring after the enqueue operation has finished.

Returns

• n: Actual number of objects enqueued.

Definition at line 532 of file rte_ring_elem.h.

rte_ring_enqueue_burst_elem()

static __rte_always_inline unsigned int rte_ring_enqueue_burst_elem ( struct rte_ring *  r, const void *  obj_table, unsigned int  esize, unsigned int  n, unsigned int *  free_space  )

static

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).

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects.
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.
n	The number of objects to add in the ring from the obj_table.
free_space	if non-NULL, returns the amount of space in the ring after the enqueue operation has finished.

Returns

• n: Actual number of objects enqueued.

Definition at line 563 of file rte_ring_elem.h.

rte_ring_mc_dequeue_burst_elem()

static __rte_always_inline unsigned int rte_ring_mc_dequeue_burst_elem ( struct rte_ring *  r, void *  obj_table, unsigned int  esize, unsigned int  n, unsigned int *  available  )

static

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.

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects that will be filled.
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.
n	The number of objects to dequeue from the ring to the obj_table.
available	If non-NULL, returns the number of remaining ring entries after the dequeue has finished.

Returns

• n: Actual number of objects dequeued, 0 if ring is empty

Definition at line 613 of file rte_ring_elem.h.

rte_ring_sc_dequeue_burst_elem()

static __rte_always_inline unsigned int rte_ring_sc_dequeue_burst_elem ( struct rte_ring *  r, void *  obj_table, unsigned int  esize, unsigned int  n, unsigned int *  available  )

static

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

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects that will be filled.
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.
n	The number of objects to dequeue from the ring to the obj_table.
available	If non-NULL, returns the number of remaining ring entries after the dequeue has finished.

Returns

• n: Actual number of objects dequeued, 0 if ring is empty

Definition at line 642 of file rte_ring_elem.h.

rte_ring_dequeue_burst_elem()

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  )

static

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).

Parameters

r	A pointer to the ring structure.
obj_table	A pointer to a table of objects that will be filled.
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.
n	The number of objects to dequeue from the ring to the obj_table.
available	If non-NULL, returns the number of remaining ring entries after the dequeue has finished.

Returns

• Number of objects dequeued

Definition at line 673 of file rte_ring_elem.h.