DPDK  24.03.0
Data Structures | Macros | Typedefs | Enumerations | Functions
rte_lcore.h File Reference
#include <stdio.h>
#include <rte_compat.h>
#include <rte_config.h>
#include <rte_per_lcore.h>
#include <rte_eal.h>
#include <rte_launch.h>
#include <rte_thread.h>

Go to the source code of this file.

Data Structures

struct  rte_lcore_usage




typedef int(* rte_lcore_init_cb) (unsigned int lcore_id, void *arg)
typedef void(* rte_lcore_uninit_cb) (unsigned int lcore_id, void *arg)
typedef int(* rte_lcore_iterate_cb) (unsigned int lcore_id, void *arg)
typedef int(* rte_lcore_usage_cb) (unsigned int lcore_id, struct rte_lcore_usage *usage)


enum  rte_lcore_role_t


 RTE_DECLARE_PER_LCORE (unsigned, _lcore_id)
enum rte_lcore_role_t rte_eal_lcore_role (unsigned int lcore_id)
int rte_lcore_has_role (unsigned int lcore_id, enum rte_lcore_role_t role)
static unsigned rte_lcore_id (void)
unsigned int rte_get_main_lcore (void)
unsigned int rte_lcore_count (void)
int rte_lcore_index (int lcore_id)
unsigned int rte_socket_id (void)
unsigned int rte_socket_count (void)
int rte_socket_id_by_idx (unsigned int idx)
unsigned int rte_lcore_to_socket_id (unsigned int lcore_id)
int rte_lcore_to_cpu_id (int lcore_id)
rte_cpuset_t rte_lcore_cpuset (unsigned int lcore_id)
int rte_lcore_is_enabled (unsigned int lcore_id)
unsigned int rte_get_next_lcore (unsigned int i, int skip_main, int wrap)
void * rte_lcore_callback_register (const char *name, rte_lcore_init_cb init, rte_lcore_uninit_cb uninit, void *arg)
void rte_lcore_callback_unregister (void *handle)
int rte_lcore_iterate (rte_lcore_iterate_cb cb, void *arg)
__rte_experimental void rte_lcore_register_usage_cb (rte_lcore_usage_cb cb)
void rte_lcore_dump (FILE *f)
int rte_thread_register (void)
void rte_thread_unregister (void)

Detailed Description

API for lcore and socket manipulation

Definition in file rte_lcore.h.

Macro Definition Documentation



Any lcore.

Definition at line 26 of file rte_lcore.h.


#define RTE_LCORE_FOREACH (   i)



Typedef Documentation

◆ rte_lcore_init_cb

typedef int(* rte_lcore_init_cb) (unsigned int lcore_id, void *arg)

Callback prototype for initializing lcores.

lcore_idThe lcore to consider.
argAn opaque pointer passed at callback registration.
  • -1 when refusing this operation,
  • 0 otherwise.

Definition at line 241 of file rte_lcore.h.

◆ rte_lcore_uninit_cb

typedef void(* rte_lcore_uninit_cb) (unsigned int lcore_id, void *arg)

Callback prototype for uninitializing lcores.

lcore_idThe lcore to consider.
argAn opaque pointer passed at callback registration.

Definition at line 251 of file rte_lcore.h.

◆ rte_lcore_iterate_cb

typedef int(* rte_lcore_iterate_cb) (unsigned int lcore_id, void *arg)

Callback prototype for iterating over lcores.

lcore_idThe lcore to consider.
argAn opaque pointer coming from the caller.
  • 0 lets the iteration continue.
  • !0 makes the iteration stop.

Definition at line 309 of file rte_lcore.h.

◆ rte_lcore_usage_cb

typedef int(* rte_lcore_usage_cb) (unsigned int lcore_id, struct rte_lcore_usage *usage)

Callback to allow applications to report lcore usage.

[in]lcore_idThe lcore to consider.
[out]usageCounters representing this lcore usage. This can never be NULL.
  • 0 if fields in usage were updated successfully. The fields that the application does not support must not be modified.
  • a negative value if the information is not available or if any error occurred.

Definition at line 359 of file rte_lcore.h.

Enumeration Type Documentation

◆ rte_lcore_role_t

The lcore role (used in RTE or not).

Definition at line 33 of file rte_lcore.h.

Function Documentation



Per thread "lcore id".

◆ rte_eal_lcore_role()

enum rte_lcore_role_t rte_eal_lcore_role ( unsigned int  lcore_id)

Get a lcore's role.

lcore_idThe identifier of the lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
The role of the lcore.

◆ rte_lcore_has_role()

int rte_lcore_has_role ( unsigned int  lcore_id,
enum rte_lcore_role_t  role 

Test if the core supplied has a specific role

lcore_idThe identifier of the lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
roleThe role to be checked against.
Boolean value: positive if test is true; otherwise returns 0.

◆ rte_lcore_id()

static unsigned rte_lcore_id ( void  )

Return the Application thread ID of the execution unit.

Note: in most cases the lcore id returned here will also correspond to the processor id of the CPU on which the thread is pinned, this will not be the case if the user has explicitly changed the thread to core affinities using –lcores EAL argument e.g. –lcores '(0-3)@10' to run threads with lcore IDs 0, 1, 2 and 3 on physical core 10..

Logical core ID (in EAL thread or registered non-EAL thread) or LCORE_ID_ANY (in unregistered non-EAL thread)
examples/bond/main.c, examples/distributor/main.c, examples/dma/dmafwd.c, examples/ethtool/ethtool-app/main.c, examples/eventdev_pipeline/main.c, examples/eventdev_pipeline/pipeline_worker_generic.c, examples/eventdev_pipeline/pipeline_worker_tx.c, examples/helloworld/main.c, examples/ip_fragmentation/main.c, examples/ip_pipeline/thread.c, examples/ip_reassembly/main.c, examples/ipsec-secgw/event_helper.c, examples/ipsec-secgw/ipsec-secgw.c, examples/ipsec-secgw/ipsec_worker.c, examples/ipv4_multicast/main.c, examples/l2fwd-cat/l2fwd-cat.c, examples/l2fwd-crypto/main.c, examples/l2fwd-event/l2fwd_event.c, examples/l2fwd-event/l2fwd_poll.c, examples/l2fwd-jobstats/main.c, examples/l2fwd-keepalive/main.c, examples/l2fwd-macsec/main.c, examples/l2fwd/main.c, examples/l3fwd-graph/main.c, examples/l3fwd-power/main.c, examples/l3fwd/l3fwd_acl.c, examples/l3fwd/l3fwd_em.c, examples/l3fwd/l3fwd_fib.c, examples/l3fwd/l3fwd_lpm.c, examples/link_status_interrupt/main.c, examples/multi_process/client_server_mp/mp_server/main.c, examples/multi_process/simple_mp/main.c, examples/multi_process/symmetric_mp/main.c, examples/packet_ordering/main.c, examples/pipeline/thread.c, examples/ptpclient/ptpclient.c, examples/qos_meter/main.c, examples/qos_sched/main.c, examples/rxtx_callbacks/main.c, examples/server_node_efd/efd_server/main.c, examples/skeleton/basicfwd.c, examples/timer/main.c, examples/vhost/main.c, examples/vhost_crypto/main.c, examples/vmdq/main.c, and examples/vmdq_dcb/main.c.

Definition at line 78 of file rte_lcore.h.

◆ rte_get_main_lcore()

unsigned int rte_get_main_lcore ( void  )

◆ rte_lcore_count()

unsigned int rte_lcore_count ( void  )

◆ rte_lcore_index()

int rte_lcore_index ( int  lcore_id)

Return the index of the lcore starting from zero.

When option -c or -l is given, the index corresponds to the order in the list. For example: -c 0x30, lcore 4 has index 0, and 5 has index 1. -l 22,18 lcore 22 has index 0, and 18 has index 1.

lcore_idThe targeted lcore, or -1 for the current one.
The relative index, or -1 if not enabled.
examples/vm_power_manager/channel_manager.c, and examples/vm_power_manager/power_manager.c.

◆ rte_socket_id()

unsigned int rte_socket_id ( void  )

◆ rte_socket_count()

unsigned int rte_socket_count ( void  )

Return number of physical sockets detected on the system.

Note that number of nodes may not be correspondent to their physical id's: for example, a system may report two socket id's, but the actual socket id's may be 0 and 8.

the number of physical sockets as recognized by EAL

◆ rte_socket_id_by_idx()

int rte_socket_id_by_idx ( unsigned int  idx)

Return socket id with a particular index.

This will return socket id at a particular position in list of all detected physical socket id's. For example, on a machine with sockets [0, 8], passing 1 as a parameter will return 8.

idxindex of physical socket id to return
  • physical socket id as recognized by EAL
  • -1 on error, with errno set to EINVAL

◆ rte_lcore_to_socket_id()

unsigned int rte_lcore_to_socket_id ( unsigned int  lcore_id)

◆ rte_lcore_to_cpu_id()

int rte_lcore_to_cpu_id ( int  lcore_id)

Return the id of the lcore on a socket starting from zero.

lcore_idThe targeted lcore, or -1 for the current one.
The relative index, or -1 if not enabled.

◆ rte_lcore_cpuset()

rte_cpuset_t rte_lcore_cpuset ( unsigned int  lcore_id)

Return the cpuset for a given lcore.

lcore_idthe targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
The cpuset of that lcore

◆ rte_lcore_is_enabled()

int rte_lcore_is_enabled ( unsigned int  lcore_id)

◆ rte_get_next_lcore()

unsigned int rte_get_next_lcore ( unsigned int  i,
int  skip_main,
int  wrap 

Get the next enabled lcore ID.

iThe current lcore (reference).
skip_mainIf true, do not return the ID of the main lcore.
wrapIf true, go back to 0 when RTE_MAX_LCORE is reached; otherwise, return RTE_MAX_LCORE.
The next lcore_id or RTE_MAX_LCORE if not found.
examples/bond/main.c, examples/dma/dmafwd.c, examples/ethtool/ethtool-app/main.c, examples/ipsec-secgw/event_helper.c, examples/ipsec-secgw/ipsec-secgw.c, examples/l3fwd-graph/main.c, examples/timer/main.c, examples/vm_power_manager/guest_cli/vm_power_cli_guest.c, and examples/vm_power_manager/main.c.

◆ rte_lcore_callback_register()

void* rte_lcore_callback_register ( const char *  name,
rte_lcore_init_cb  init,
rte_lcore_uninit_cb  uninit,
void *  arg 

Register callbacks invoked when initializing and uninitializing a lcore.

This function calls the init callback with all initialized lcores. Any error reported by the init callback triggers a rollback calling the uninit callback for each lcore. If this step succeeds, the callbacks are put in the lcore callbacks list that will get called for each lcore allocation/release.

Note: callbacks execution is serialised under a write lock protecting the lcores and callbacks list.

nameA name serving as a small description for this callback.
initThe callback invoked when a lcore_id is initialized. init can be NULL.
uninitThe callback invoked when a lcore_id is uninitialized. uninit can be NULL.
argAn optional argument that gets passed to the callback when it gets invoked.
On success, returns an opaque pointer for the registered object. On failure (either memory allocation issue in the function itself or an error is returned by the init callback itself), returns NULL.

◆ rte_lcore_callback_unregister()

void rte_lcore_callback_unregister ( void *  handle)

Unregister callbacks previously registered with rte_lcore_callback_register.

This function calls the uninit callback with all initialized lcores. The callbacks are then removed from the lcore callbacks list.

handleThe handle pointer returned by a former successful call to rte_lcore_callback_register.

◆ rte_lcore_iterate()

int rte_lcore_iterate ( rte_lcore_iterate_cb  cb,
void *  arg 

Iterate on all active lcores (ROLE_RTE, ROLE_SERVICE and ROLE_NON_EAL). No modification on the lcore states is allowed in the callback.

Note: as opposed to init/uninit callbacks, iteration callbacks can be invoked in parallel as they are run under a read lock protecting the lcores and callbacks list.

cbThe callback that gets passed each lcore.
argAn opaque pointer passed to cb.
Same return code as the callback last invocation (see rte_lcore_iterate_cb description).

◆ rte_lcore_register_usage_cb()

__rte_experimental void rte_lcore_register_usage_cb ( rte_lcore_usage_cb  cb)
EXPERIMENTAL: this API may change without prior notice.

Register a callback from an application to be called in rte_lcore_dump() and the /eal/lcore/info telemetry endpoint handler. Applications are expected to report lcore usage statistics via this callback.

If a callback was already registered, it can be replaced with another callback or unregistered with NULL. The previously registered callback may remain in use for an undetermined period of time.

cbThe callback function.

◆ rte_lcore_dump()

void rte_lcore_dump ( FILE *  f)

List all lcores.

fThe output stream where the dump should be sent.

◆ rte_thread_register()

int rte_thread_register ( void  )

Register current non-EAL thread as a lcore.

This API is not compatible with the multi-process feature:
  • if a primary process registers a non-EAL thread, then no secondary process will initialise.
  • if a secondary process initialises successfully, trying to register a non-EAL thread from either primary or secondary processes will always end up with the thread getting LCORE_ID_ANY as lcore.
On success, return 0; otherwise return -1 with rte_errno set.

◆ rte_thread_unregister()

void rte_thread_unregister ( void  )

Unregister current thread and release lcore if one was associated.