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rte_event_ring.h(3) Library Functions Manual rte_event_ring.h(3)

NAME

rte_event_ring.h

SYNOPSIS

#include <stdint.h>
#include <rte_common.h>
#include <rte_ring.h>
#include <rte_ring_elem.h>
#include 'rte_eventdev.h'

Data Structures


struct rte_event_ring

Functions


static __rte_always_inline unsigned int rte_event_ring_count (const struct rte_event_ring *r)
static __rte_always_inline unsigned int rte_event_ring_free_count (const struct rte_event_ring *r)
static __rte_always_inline unsigned int rte_event_ring_enqueue_bulk (struct rte_event_ring *r, const struct rte_event *events, unsigned int n, uint16_t *free_space)
static __rte_always_inline unsigned int rte_event_ring_dequeue_bulk (struct rte_event_ring *r, struct rte_event *events, unsigned int n, uint16_t *available)
static __rte_always_inline unsigned int rte_event_ring_enqueue_burst (struct rte_event_ring *r, const struct rte_event *events, unsigned int n, uint16_t *free_space)
static __rte_always_inline unsigned int rte_event_ring_dequeue_burst (struct rte_event_ring *r, struct rte_event *events, unsigned int n, uint16_t *available)
void rte_event_ring_free (struct rte_event_ring *r)
struct rte_event_ring * rte_event_ring_create (const char *name, unsigned int count, int socket_id, unsigned int flags) __rte_malloc __rte_dealloc(rte_event_ring_free
struct rte_event_ring struct rte_event_ring * rte_event_ring_lookup (const char *name)
static unsigned int rte_event_ring_get_size (const struct rte_event_ring *r)
static unsigned int rte_event_ring_get_capacity (const struct rte_event_ring *r)

Detailed Description

RTE Event Ring

This provides a ring implementation for passing rte_event structures from one core to another.

Definition in file rte_event_ring.h.

Function Documentation

__rte_always_inline unsigned int rte_event_ring_count (const struct rte_event_ring * r) [static]

Returns the number of events in the ring

Parameters

r pointer to the event ring

Returns

the number of events in the ring

Definition at line 50 of file rte_event_ring.h.

__rte_always_inline unsigned int rte_event_ring_free_count (const struct rte_event_ring * r) [static]

Returns the amount of free space in the ring

Parameters

r pointer to the event ring

Returns

the number of free slots in the ring, i.e. the number of events that can be successfully enqueued before dequeue must be called

Definition at line 65 of file rte_event_ring.h.

__rte_always_inline unsigned int rte_event_ring_enqueue_bulk (struct rte_event_ring * r, const struct rte_event * events, unsigned int n, uint16_t * 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 pointer to the event ring
events pointer to an array of struct rte_event objects
n The number of events in the array to enqueue
free_space if non-NULL, returns the amount of space in the ring after the enqueue operation has completed

Returns

the number of objects enqueued, either 0 or n

Definition at line 91 of file rte_event_ring.h.

__rte_always_inline unsigned int rte_event_ring_dequeue_bulk (struct rte_event_ring * r, struct rte_event * events, unsigned int n, uint16_t * available) [static]

Dequeue a set of events from a ring

Note: this API does not work with pointers to events, rather it copies the events themselves to the destination events buffer.

Parameters

r pointer to the event ring
events pointer to an array to hold the struct rte_event objects
n number of events that can be held in the events array
available if non-null, is updated to indicate the number of events remaining in the ring once the dequeue has completed

Returns

the number of objects dequeued, either 0 or n

Definition at line 127 of file rte_event_ring.h.

__rte_always_inline unsigned int rte_event_ring_enqueue_burst (struct rte_event_ring * r, const struct rte_event * events, unsigned int n, uint16_t * free_space) [static]

Enqueue a set of events onto a ring

Note: this API enqueues by copying the events themselves onto the ring, rather than just placing a pointer to each event onto the ring. This means that statically-allocated events can safely be enqueued by this API.

Parameters

r pointer to the event ring
events pointer to an array of struct rte_event objects
n number of events in the array to enqueue
free_space if non-null, is updated to indicate the amount of free space in the ring once the enqueue has completed.

Returns

the number of elements, n', enqueued to the ring, 0 <= n' <= n

Definition at line 165 of file rte_event_ring.h.

__rte_always_inline unsigned int rte_event_ring_dequeue_burst (struct rte_event_ring * r, struct rte_event * events, unsigned int n, uint16_t * available) [static]

Dequeue a set of events from a ring

Note: this API does not work with pointers to events, rather it copies the events themselves to the destination events buffer.

Parameters

r pointer to the event ring
events pointer to an array to hold the struct rte_event objects
n number of events that can be held in the events array
available if non-null, is updated to indicate the number of events remaining in the ring once the dequeue has completed

Returns

the number of elements, n', dequeued from the ring, 0 <= n' <= n

Definition at line 201 of file rte_event_ring.h.

void rte_event_ring_free (struct rte_event_ring * r)

De-allocate all memory used by the ring.

Parameters

r Pointer to ring to created with rte_event_ring_create(). If r is NULL, no operation is performed.

struct rte_event_ring * rte_event_ring_create (const char * name, unsigned int count, int socket_id, unsigned int flags)

Create an event ring structure

This function allocates memory and initializes an event ring inside that memory.

Parameters

name name to be given to the ring
count the number of elements to be stored in the ring. If the flag RING_F_EXACT_SZ is not set, this must be a power of 2, and the actual usable space in the ring will be count - 1 entries. If the flag RING_F_EXACT_SZ is set, the this can be any value up to the ring size limit - 1, and the usable space will be exactly that requested.
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:
  • 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". Otherwise, it is "multi-producers".
  • 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_EXACT_SZ: If this flag is set, the count parameter is to be taken as the exact usable size of the ring, and as such does not need to be a power of 2. The underlying ring memory should be a power-of-2 size greater than the count value.

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 - 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_event_ring struct rte_event_ring * rte_event_ring_lookup (const char * name)

Search for an event ring based on its name

Parameters

name The name of the ring.

Returns

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.

unsigned int rte_event_ring_get_size (const struct rte_event_ring * r) [inline], [static]

Return the size of the event ring.

Parameters

r A pointer to the ring structure.

Returns

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().

Definition at line 328 of file rte_event_ring.h.

unsigned int rte_event_ring_get_capacity (const struct rte_event_ring * r) [inline], [static]

Return the number of elements which can be stored in the event ring.

Parameters

r A pointer to the ring structure.

Returns

The usable size of the ring.

Definition at line 342 of file rte_event_ring.h.

Author

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