Provided by: dpdk-doc_24.11.2-2_all 
NAME
rte_lcore.h
SYNOPSIS
#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>
Data Structures
struct rte_lcore_usage
Macros
#define LCORE_ID_ANY UINT32_MAX
#define RTE_LCORE_FOREACH(i)
#define RTE_LCORE_FOREACH_WORKER(i)
Typedefs
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)
Enumerations
enum rte_lcore_role_t
Functions
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)
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
#define LCORE_ID_ANY UINT32_MAX
Any lcore.
Definition at line 26 of file rte_lcore.h.
#define RTE_LCORE_FOREACH(i)
Value:.PP
for (i = rte_get_next_lcore(-1, 0, 0); \
i < RTE_MAX_LCORE; \
i = rte_get_next_lcore(i, 0, 0))
Macro to browse all running lcores.
Definition at line 217 of file rte_lcore.h.
#define RTE_LCORE_FOREACH_WORKER(i)
Value:.PP
for (i = rte_get_next_lcore(-1, 1, 0); \
i < RTE_MAX_LCORE; \
i = rte_get_next_lcore(i, 1, 0))
Macro to browse all running lcores except the main lcore.
Definition at line 225 of file rte_lcore.h.
Typedef Documentation
typedef int(* rte_lcore_init_cb) (unsigned int lcore_id, void *arg)
Callback prototype for initializing lcores.
Parameters
lcore_id The lcore to consider.
arg An opaque pointer passed at callback registration.
Returns
• -1 when refusing this operation,
• 0 otherwise.
Definition at line 241 of file rte_lcore.h.
typedef void(* rte_lcore_uninit_cb) (unsigned int lcore_id, void *arg)
Callback prototype for uninitializing lcores.
Parameters
lcore_id The lcore to consider.
arg An opaque pointer passed at callback registration.
Definition at line 251 of file rte_lcore.h.
typedef int(* rte_lcore_iterate_cb) (unsigned int lcore_id, void *arg)
Callback prototype for iterating over lcores.
Parameters
lcore_id The lcore to consider.
arg An opaque pointer coming from the caller.
Returns
• 0 lets the iteration continue.
• !0 makes the iteration stop.
Definition at line 309 of file rte_lcore.h.
typedef int(* rte_lcore_usage_cb) (unsigned int lcore_id, struct rte_lcore_usage *usage)
Callback to allow applications to report lcore usage.
Parameters
lcore_id The lcore to consider.
usage Counters representing this lcore usage. This can never be NULL.
Returns
• 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
enum rte_lcore_role_t
The lcore role (used in RTE or not).
Definition at line 33 of file rte_lcore.h.
Function Documentation
RTE_DECLARE_PER_LCORE (unsigned, _lcore_id)
Per thread 'lcore id'.
enum rte_lcore_role_t rte_eal_lcore_role (unsigned int lcore_id)
Get a lcore's role.
Parameters
lcore_id The identifier of the lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
Returns
The role of the lcore.
int rte_lcore_has_role (unsigned int lcore_id, enum rte_lcore_role_t role)
Test if the core supplied has a specific role
Parameters
lcore_id The identifier of the lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
role The role to be checked against.
Returns
Boolean value: positive if test is true; otherwise returns 0.
static unsigned rte_lcore_id (void) [inline], [static]
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..
Returns
Logical core ID (in EAL thread or registered non-EAL thread) or LCORE_ID_ANY (in unregistered non-EAL
thread)
Definition at line 78 of file rte_lcore.h.
unsigned int rte_get_main_lcore (void)
Get the id of the main lcore
Returns
the id of the main lcore
unsigned int rte_lcore_count (void)
Return the number of execution units (lcores) on the system.
Returns
the number of execution units (lcores) on the system.
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.
Parameters
lcore_id The targeted lcore, or -1 for the current one.
Returns
The relative index, or -1 if not enabled.
unsigned int rte_socket_id (void)
Return the ID of the physical socket of the logical core we are running on.
Returns
the ID of current lcoreid's physical socket
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.
Returns
the number of physical sockets as recognized by EAL
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.
Parameters
idx index of physical socket id to return
Returns
• physical socket id as recognized by EAL
• -1 on error, with errno set to EINVAL
unsigned int rte_lcore_to_socket_id (unsigned int lcore_id)
Get the ID of the physical socket of the specified lcore
Parameters
lcore_id the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
Returns
the ID of lcoreid's physical socket
int rte_lcore_to_cpu_id (int lcore_id)
Return the id of the lcore on a socket starting from zero.
Parameters
lcore_id The targeted lcore, or -1 for the current one.
Returns
The relative index, or -1 if not enabled.
rte_cpuset_t rte_lcore_cpuset (unsigned int lcore_id)
Return the cpuset for a given lcore.
Parameters
lcore_id the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
Returns
The cpuset of that lcore
int rte_lcore_is_enabled (unsigned int lcore_id)
Test if an lcore is enabled.
Parameters
lcore_id The identifier of the lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
Returns
True if the given lcore is enabled; false otherwise.
unsigned int rte_get_next_lcore (unsigned int i, int skip_main, int wrap)
Get the next enabled lcore ID.
Parameters
i The current lcore (reference).
skip_main If true, do not return the ID of the main lcore.
wrap If true, go back to 0 when RTE_MAX_LCORE is reached; otherwise, return RTE_MAX_LCORE.
Returns
The next lcore_id or RTE_MAX_LCORE if not found.
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.
Parameters
name A name serving as a small description for this callback.
init The callback invoked when a lcore_id is initialized. init can be NULL.
uninit The callback invoked when a lcore_id is uninitialized. uninit can be NULL.
arg An optional argument that gets passed to the callback when it gets invoked.
Returns
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.
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.
Parameters
handle The handle pointer returned by a former successful call to rte_lcore_callback_register.
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.
Parameters
cb The callback that gets passed each lcore.
arg An opaque pointer passed to cb.
Returns
Same return code as the callback last invocation (see rte_lcore_iterate_cb description).
void rte_lcore_register_usage_cb (rte_lcore_usage_cb cb)
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.
Parameters
cb The callback function.
void rte_lcore_dump (FILE * f)
List all lcores.
Parameters
f The output stream where the dump should be sent.
int rte_thread_register (void)
Register current non-EAL thread as a lcore.
Note
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.
Returns
On success, return 0; otherwise return -1 with rte_errno set.
void rte_thread_unregister (void)
Unregister current thread and release lcore if one was associated.
Author
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DPDK Version 24.11.2 rte_lcore.h(3)