1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2017 Intel Corporation
5 #ifndef _SERVICE_PRIVATE_H_
6 #define _SERVICE_PRIVATE_H_
8 /* This file specifies the internal service specification.
9 * Include this file if you are writing a component that requires CPU cycles to
10 * operate, and you wish to run the component using service cores
12 #include <rte_compat.h>
13 #include <rte_service.h>
16 * Signature of callback function to run a service.
18 typedef int32_t (*rte_service_func)(void *args);
21 * The specification of a service.
23 * This struct contains metadata about the service itself, the callback
24 * function to run one iteration of the service, a userdata pointer, flags etc.
26 struct rte_service_spec {
27 /** The name of the service. This should be used by the application to
28 * understand what purpose this service provides.
30 char name[RTE_SERVICE_NAME_MAX];
31 /** The callback to invoke to run one iteration of the service. */
32 rte_service_func callback;
33 /** The userdata pointer provided to the service callback. */
34 void *callback_userdata;
35 /** Flags to indicate the capabilities of this service. See defines in
36 * the public header file for values of RTE_SERVICE_CAP_*
38 uint32_t capabilities;
39 /** NUMA socket ID that this service is affinitized to */
44 * Register a new service.
46 * A service represents a component that requires CPU time periodically to
47 * achieve its purpose.
49 * For example the eventdev SW PMD requires CPU cycles to perform its
50 * scheduling. This can be achieved by registering it as a service, and the
51 * application can then assign CPU resources to that service.
53 * Note that when a service component registers itself, it is not permitted to
54 * add or remove service-core threads, or modify lcore-to-service mappings. The
55 * only API that may be called by the service-component is
56 * *rte_service_component_runstate_set*, which indicates that the service
57 * component is ready to be executed.
59 * If the service is known to be mapped to a single lcore, setting the
60 * capability of the service to RTE_SERVICE_CAP_MT_SAFE can achieve
63 * @param spec The specification of the service to register
64 * @param[out] service_id A pointer to a uint32_t, which will be filled in
65 * during registration of the service. It is set to the integers
66 * service number given to the service. This parameter may be NULL.
67 * @retval 0 Successfully registered the service.
68 * -EINVAL Attempted to register an invalid service (eg, no callback
71 int32_t rte_service_component_register(const struct rte_service_spec *spec,
72 uint32_t *service_id);
75 * Unregister a service component.
77 * The service being removed must be stopped before calling this function.
79 * @retval 0 The service was successfully unregistered.
80 * @retval -EBUSY The service is currently running, stop the service before
81 * calling unregister. No action has been taken.
83 int32_t rte_service_component_unregister(uint32_t id);
86 * Private function to allow EAL to initialized default mappings.
88 * This function iterates all the services, and maps then to the available
89 * cores. Based on the capabilities of the services, they are set to run on the
90 * available cores in a round-robin manner.
93 * @retval -ENOTSUP No service lcores in use
94 * @retval -EINVAL Error while iterating over services
95 * @retval -ENODEV Error in enabling service lcore on a service
96 * @retval -ENOEXEC Error when starting services
98 int32_t rte_service_start_with_defaults(void);
101 * Set the backend runstate of a component.
103 * This function allows services to be registered at startup, but not yet
104 * enabled to run by default. When the service has been configured (via the
105 * usual method; eg rte_eventdev_configure, the service can mark itself as
106 * ready to run. The differentiation between backend runstate and
107 * service_runstate is that the backend runstate is set by the service
108 * component while the service runstate is reserved for application usage.
112 int32_t rte_service_component_runstate_set(uint32_t id, uint32_t runstate);
115 * Initialize the service library.
117 * In order to use the service library, it must be initialized. EAL initializes
118 * the library at startup.
121 * @retval -EALREADY Service library is already initialized
123 int32_t rte_service_init(void);
126 * @internal Free up the memory that has been initialized.
127 * This routine is to be invoked prior to process termination.
131 void rte_service_finalize(void);
133 #endif /* _SERVICE_PRIVATE_H_ */