DPDK
19.11.14
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#include <stdio.h>
#include <stdint.h>
#include <sys/queue.h>
#include <rte_config.h>
#include <rte_lcore.h>
Go to the source code of this file.
Macros | |
#define | RTE_SERVICE_CAP_MT_SAFE (1 << 0) |
#define | RTE_SERVICE_ATTR_CYCLES 0 |
#define | RTE_SERVICE_ATTR_CALL_COUNT 1 |
#define | RTE_SERVICE_LCORE_ATTR_LOOPS 0 |
Functions | |
uint32_t | rte_service_get_count (void) |
int32_t | rte_service_get_by_name (const char *name, uint32_t *service_id) |
const char * | rte_service_get_name (uint32_t id) |
int32_t | rte_service_probe_capability (uint32_t id, uint32_t capability) |
int32_t | rte_service_map_lcore_set (uint32_t service_id, uint32_t lcore, uint32_t enable) |
int32_t | rte_service_map_lcore_get (uint32_t service_id, uint32_t lcore) |
int32_t | rte_service_runstate_set (uint32_t id, uint32_t runstate) |
int32_t | rte_service_runstate_get (uint32_t id) |
int32_t | rte_service_may_be_active (uint32_t id) |
int32_t | rte_service_set_runstate_mapped_check (uint32_t id, int32_t enable) |
int32_t | rte_service_run_iter_on_app_lcore (uint32_t id, uint32_t serialize_multithread_unsafe) |
int32_t | rte_service_lcore_start (uint32_t lcore_id) |
int32_t | rte_service_lcore_stop (uint32_t lcore_id) |
int32_t | rte_service_lcore_add (uint32_t lcore) |
int32_t | rte_service_lcore_del (uint32_t lcore) |
int32_t | rte_service_lcore_count (void) |
int32_t | rte_service_lcore_reset_all (void) |
int32_t | rte_service_set_stats_enable (uint32_t id, int32_t enable) |
int32_t | rte_service_lcore_list (uint32_t array[], uint32_t n) |
int32_t | rte_service_lcore_count_services (uint32_t lcore) |
int32_t | rte_service_dump (FILE *f, uint32_t id) |
int32_t | rte_service_attr_get (uint32_t id, uint32_t attr_id, uint64_t *attr_value) |
int32_t | rte_service_attr_reset_all (uint32_t id) |
int32_t | rte_service_lcore_attr_get (uint32_t lcore, uint32_t attr_id, uint64_t *attr_value) |
int32_t | rte_service_lcore_attr_reset_all (uint32_t lcore) |
Service functions
The service functionality provided by this header allows a DPDK component to indicate that it requires a function call in order for it to perform its processing.
An example usage of this functionality would be a component that registers a service to perform a particular packet processing duty: for example the eventdev software PMD. At startup the application requests all services that have been registered, and the cores in the service-coremask run the required services. The EAL removes these number of cores from the available runtime cores, and dedicates them to performing service-core workloads. The application has access to the remaining lcores as normal.
Definition in file rte_service.h.
#define RTE_SERVICE_CAP_MT_SAFE (1 << 0) |
When set, the service is capable of having multiple threads run it at the same time.
Definition at line 47 of file rte_service.h.
#define RTE_SERVICE_ATTR_CYCLES 0 |
Returns the number of cycles that this service has consumed
Definition at line 363 of file rte_service.h.
#define RTE_SERVICE_ATTR_CALL_COUNT 1 |
Returns the count of invocations of this service function
Definition at line 368 of file rte_service.h.
#define RTE_SERVICE_LCORE_ATTR_LOOPS 0 |
Returns the number of times the service runner has looped.
Definition at line 391 of file rte_service.h.
uint32_t rte_service_get_count | ( | void | ) |
Return the number of services registered.
int32_t rte_service_get_by_name | ( | const char * | name, |
uint32_t * | service_id | ||
) |
Return the id of a service by name.
This function provides the id of the service using the service name as lookup key. The service id is to be passed to other functions in the rte_service_* API.
Example usage:
name | The name of the service to retrieve | |
[out] | service_id | A pointer to a uint32_t, to be filled in with the id. |
0 | Success. The service id is provided in service_id. |
-EINVAL | Null service_id pointer provided |
-ENODEV | No such service registered |
const char* rte_service_get_name | ( | uint32_t | id | ) |
Return the name of the service.
int32_t rte_service_probe_capability | ( | uint32_t | id, |
uint32_t | capability | ||
) |
Check if a service has a specific capability.
This function returns if service has implements capability. See RTE_SERVICE_CAP_* defines for a list of valid capabilities.
1 | Capability supported by this service instance |
0 | Capability not supported by this service instance |
int32_t rte_service_map_lcore_set | ( | uint32_t | service_id, |
uint32_t | lcore, | ||
uint32_t | enable | ||
) |
Map or unmap a lcore to a service.
Each core can be added or removed from running a specific service. This function enables or disables lcore to run service_id.
If multiple cores are enabled on a service, a lock is used to ensure that only one core runs the service at a time. The exception to this is when a service indicates that it is multi-thread safe by setting the capability called RTE_SERVICE_CAP_MT_SAFE. With the multi-thread safe capability set, the service function can be run on multiple threads at the same time.
If the service is known to be mapped to a single lcore, setting the capability of the service to RTE_SERVICE_CAP_MT_SAFE can achieve better performance by avoiding the use of lock.
service_id | the service to apply the lcore to |
lcore | The lcore that will be mapped to service |
enable | Zero to unmap or disable the core, non-zero to enable |
0 | lcore map updated successfully |
-EINVAL | An invalid service or lcore was provided. |
int32_t rte_service_map_lcore_get | ( | uint32_t | service_id, |
uint32_t | lcore | ||
) |
Retrieve the mapping of an lcore to a service.
service_id | the service to apply the lcore to |
lcore | The lcore that will be mapped to service |
1 | lcore is mapped to service |
0 | lcore is not mapped to service |
-EINVAL | An invalid service or lcore was provided. |
int32_t rte_service_runstate_set | ( | uint32_t | id, |
uint32_t | runstate | ||
) |
Set the runstate of the service.
Each service is either running or stopped. Setting a non-zero runstate enables the service to run, while setting runstate zero disables it.
id | The id of the service |
runstate | The run state to apply to the service |
0 | The service was successfully started |
-EINVAL | Invalid service id |
int32_t rte_service_runstate_get | ( | uint32_t | id | ) |
Get the runstate for the service with id. See rte_service_runstate_set for details of runstates. A service can call this function to ensure that the application has indicated that it will receive CPU cycles. Either a service-core is mapped (default case), or the application has explicitly disabled the check that a service-cores is mapped to the service and takes responsibility to run the service manually using the available function rte_service_run_iter_on_app_lcore to do so.
1 | Service is running |
0 | Service is stopped |
-EINVAL | Invalid service id |
int32_t rte_service_may_be_active | ( | uint32_t | id | ) |
This function returns whether the service may be currently executing on at least one lcore, or definitely is not. This function can be used to determine if, after setting the service runstate to stopped, the service is still executing a service lcore.
Care must be taken if calling this function when the service runstate is running, since the result of this function may be incorrect by the time the function returns due to service cores running in parallel.
1 | Service may be running on one or more lcores |
0 | Service is not running on any lcore |
-EINVAL | Invalid service id |
int32_t rte_service_set_runstate_mapped_check | ( | uint32_t | id, |
int32_t | enable | ||
) |
Enable or disable the check for a service-core being mapped to the service. An application can disable the check when takes the responsibility to run a service itself using rte_service_run_iter_on_app_lcore.
id | The id of the service to set the check on |
enable | When zero, the check is disabled. Non-zero enables the check. |
0 | Success |
-EINVAL | Invalid service ID |
int32_t rte_service_run_iter_on_app_lcore | ( | uint32_t | id, |
uint32_t | serialize_multithread_unsafe | ||
) |
This function runs a service callback from a non-service lcore.
This function is designed to enable gradual porting to service cores, and to enable unit tests to verify a service behaves as expected.
When called, this function ensures that the service identified by id is safe to run on this lcore. Multi-thread safe services are invoked even if other cores are simultaneously running them as they are multi-thread safe.
Multi-thread unsafe services are handled depending on the variable serialize_multithread_unsafe:
id | The ID of the service to run |
serialize_multithread_unsafe | This parameter indicates to the service cores library if it is required to use atomics to serialize access to mult-thread unsafe services. As there is an overhead in using atomics, applications can choose to enable or disable this feature |
Note that any thread calling this function MUST be a DPDK EAL thread, as the rte_lcore_id function is used to access internal data structures.
0 | Service was run on the calling thread successfully |
-EBUSY | Another lcore is executing the service, and it is not a multi-thread safe service, so the service was not run on this lcore |
-ENOEXEC | Service is not in a run-able state |
-EINVAL | Invalid service id |
int32_t rte_service_lcore_start | ( | uint32_t | lcore_id | ) |
Start a service core.
Starting a core makes the core begin polling. Any services assigned to it will be run as fast as possible. The application must ensure that the lcore is in a launchable state: e.g. call rte_eal_lcore_wait on the lcore_id before calling this function.
0 | Success |
-EINVAL | Failed to start core. The lcore_id passed in is not currently assigned to be a service core. |
int32_t rte_service_lcore_stop | ( | uint32_t | lcore_id | ) |
Stop a service core.
Stopping a core makes the core become idle, but remains assigned as a service core.
0 | Success |
-EINVAL | Invalid lcore_id provided |
-EALREADY | Already stopped core |
-EBUSY | Failed to stop core, as it would cause a service to not be run, as this is the only core currently running the service. The application must stop the service first, and then stop the lcore. |
int32_t rte_service_lcore_add | ( | uint32_t | lcore | ) |
Adds lcore to the list of service cores.
This functions can be used at runtime in order to modify the service core mask.
0 | Success |
-EBUSY | lcore is busy, and not available for service core duty |
-EALREADY | lcore is already added to the service core list |
-EINVAL | Invalid lcore provided |
int32_t rte_service_lcore_del | ( | uint32_t | lcore | ) |
Removes lcore from the list of service cores.
This can fail if the core is not stopped, see rte_service_core_stop.
0 | Success |
-EBUSY | Lcore is not stopped, stop service core before removing. |
-EINVAL | failed to add lcore to service core mask. |
int32_t rte_service_lcore_count | ( | void | ) |
Retrieve the number of service cores currently available.
This function returns the integer count of service cores available. The service core count can be used in mapping logic when creating mappings from service cores to services.
See rte_service_lcore_list for details on retrieving the lcore_id of each service core.
int32_t rte_service_lcore_reset_all | ( | void | ) |
Resets all service core mappings. This does not remove the service cores from duty, just unmaps all services / cores, and stops() the service cores. The runstate of services is not modified.
The cores that are stopped with this call, are in FINISHED state and the application must take care of bringing them back to a launchable state: e.g. call rte_eal_lcore_wait on the lcore_id.
0 | Success |
int32_t rte_service_set_stats_enable | ( | uint32_t | id, |
int32_t | enable | ||
) |
Enable or disable statistics collection for service.
This function enables per core, per-service cycle count collection.
id | The service to enable statistics gathering on. |
enable | Zero to disable statistics, non-zero to enable. |
0 | Success |
-EINVAL | Invalid service pointer passed |
int32_t rte_service_lcore_list | ( | uint32_t | array[], |
uint32_t | n | ||
) |
Retrieve the list of currently enabled service cores.
This function fills in an application supplied array, with each element indicating the lcore_id of a service core.
Adding and removing service cores can be performed using rte_service_lcore_add and rte_service_lcore_del.
[out] | array | An array of at least rte_service_lcore_count items. If statically allocating the buffer, use RTE_MAX_LCORE. |
[out] | n | The size of array. |
>=0 | Number of service cores that have been populated in the array |
-ENOMEM | The provided array is not large enough to fill in the service core list. No items have been populated, call this function with a size of at least rte_service_core_count items. |
int32_t rte_service_lcore_count_services | ( | uint32_t | lcore | ) |
Get the number of services running on the supplied lcore.
lcore | Id of the service core. |
>=0 | Number of services registered to this core. |
-EINVAL | Invalid lcore provided |
-ENOTSUP | The provided lcore is not a service core. |
int32_t rte_service_dump | ( | FILE * | f, |
uint32_t | id | ||
) |
Dumps any information available about the service. When id is UINT32_MAX, this function dumps info for all services.
0 | Statistics have been successfully dumped |
-EINVAL | Invalid service id provided |
int32_t rte_service_attr_get | ( | uint32_t | id, |
uint32_t | attr_id, | ||
uint64_t * | attr_value | ||
) |
Get an attribute from a service.
0 | Success, the attribute value has been written to attr_value. -EINVAL Invalid id, attr_id or attr_value was NULL. |
int32_t rte_service_attr_reset_all | ( | uint32_t | id | ) |
Reset all attribute values of a service.
id | The service to reset all statistics of |
0 | Successfully reset attributes -EINVAL Invalid service id provided |
int32_t rte_service_lcore_attr_get | ( | uint32_t | lcore, |
uint32_t | attr_id, | ||
uint64_t * | attr_value | ||
) |
Get an attribute from a service core.
lcore | Id of the service core. | |
attr_id | Id of the attribute to be retrieved. | |
[out] | attr_value | Pointer to storage in which to write retrieved value. |
0 | Success, the attribute value has been written to attr_value. -EINVAL Invalid lcore, attr_id or attr_value was NULL. -ENOTSUP lcore is not a service core. |
int32_t rte_service_lcore_attr_reset_all | ( | uint32_t | lcore | ) |
Reset all attribute values of a service core.
lcore | The service core to reset all the statistics of |
0 | Successfully reset attributes -EINVAL Invalid service id provided -ENOTSUP lcore is not a service core. |