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Diffstat (limited to 'examples/service_cores/main.c')
| -rw-r--r-- | examples/service_cores/main.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/examples/service_cores/main.c b/examples/service_cores/main.c new file mode 100644 index 00000000..b617a789 --- /dev/null +++ b/examples/service_cores/main.c @@ -0,0 +1,246 @@ +/* + * BSD LICENSE + * + * Copyright(c) 2017 Intel Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <unistd.h> +#include <stdio.h> +#include <string.h> +#include <stdint.h> +#include <errno.h> +#include <sys/queue.h> + +#include <rte_memory.h> +#include <rte_launch.h> +#include <rte_eal.h> +#include <rte_debug.h> +#include <rte_cycles.h> + +/* allow application scheduling of the services */ +#include <rte_service.h> + +/* Allow application registration of its own services. An application does not + * have to register services, but it can be useful if it wishes to run a + * function on a core that is otherwise in use as a service core. In this + * example, all services are dummy services registered by the sample app itself. + */ +#include <rte_service_component.h> + +#define PROFILE_CORES_MAX 8 +#define PROFILE_SERVICE_PER_CORE 5 + +/* dummy function to do "work" */ +static int32_t service_func(void *args) +{ + RTE_SET_USED(args); + rte_delay_us(2000); + return 0; +} + +static struct rte_service_spec services[] = { + {"service_1", service_func, NULL, 0, 0}, + {"service_2", service_func, NULL, 0, 0}, + {"service_3", service_func, NULL, 0, 0}, + {"service_4", service_func, NULL, 0, 0}, + {"service_5", service_func, NULL, 0, 0}, +}; +#define NUM_SERVICES RTE_DIM(services) + +/* this struct holds the mapping of a particular core to all services */ +struct profile_for_core { + uint32_t mapped_services[PROFILE_SERVICE_PER_CORE]; +}; + +/* struct that can be applied as the service core mapping. Items in this + * struct will be passed to the ordinary rte_service_* APIs to configure the + * service cores at runtime, based on the requirements. + * + * These profiles can be considered a "configuration" for the service cores, + * where switching profile just changes the number of cores and the mappings + * for each of them. As a result, the core requirements and performance of the + * application scales. + */ +struct profile { + char name[64]; + uint32_t num_cores; + struct profile_for_core cores[PROFILE_CORES_MAX]; +}; + +static struct profile profiles[] = { + /* profile 0: high performance */ + { + .name = "High Performance", + .num_cores = 5, + .cores[0] = {.mapped_services = {1, 0, 0, 0, 0} }, + .cores[1] = {.mapped_services = {0, 1, 0, 0, 0} }, + .cores[2] = {.mapped_services = {0, 0, 1, 0, 0} }, + .cores[3] = {.mapped_services = {0, 0, 0, 1, 0} }, + .cores[4] = {.mapped_services = {0, 0, 0, 0, 1} }, + }, + /* profile 1: mid performance with single service priority */ + { + .name = "Mid-High Performance", + .num_cores = 3, + .cores[0] = {.mapped_services = {1, 1, 0, 0, 0} }, + .cores[1] = {.mapped_services = {0, 0, 1, 1, 0} }, + .cores[2] = {.mapped_services = {0, 0, 0, 0, 1} }, + .cores[3] = {.mapped_services = {0, 0, 0, 0, 0} }, + .cores[4] = {.mapped_services = {0, 0, 0, 0, 0} }, + }, + /* profile 2: mid performance with single service priority */ + { + .name = "Mid-Low Performance", + .num_cores = 2, + .cores[0] = {.mapped_services = {1, 1, 1, 0, 0} }, + .cores[1] = {.mapped_services = {1, 1, 0, 1, 1} }, + .cores[2] = {.mapped_services = {0, 0, 0, 0, 0} }, + .cores[3] = {.mapped_services = {0, 0, 0, 0, 0} }, + .cores[4] = {.mapped_services = {0, 0, 0, 0, 0} }, + }, + /* profile 3: scale down performance on single core */ + { + .name = "Scale down performance", + .num_cores = 1, + .cores[0] = {.mapped_services = {1, 1, 1, 1, 1} }, + .cores[1] = {.mapped_services = {0, 0, 0, 0, 0} }, + .cores[2] = {.mapped_services = {0, 0, 0, 0, 0} }, + .cores[3] = {.mapped_services = {0, 0, 0, 0, 0} }, + .cores[4] = {.mapped_services = {0, 0, 0, 0, 0} }, + }, +}; +#define NUM_PROFILES RTE_DIM(profiles) + +static void +apply_profile(int profile_id) +{ + uint32_t i; + uint32_t s; + int ret; + struct profile *p = &profiles[profile_id]; + const uint8_t core_off = 1; + + for (i = 0; i < p->num_cores; i++) { + uint32_t core = i + core_off; + ret = rte_service_lcore_add(core); + if (ret && ret != -EALREADY) + printf("core %d added ret %d\n", core, ret); + + ret = rte_service_lcore_start(core); + if (ret && ret != -EALREADY) + printf("core %d start ret %d\n", core, ret); + + for (s = 0; s < NUM_SERVICES; s++) { + if (rte_service_map_lcore_set(s, core, + p->cores[i].mapped_services[s])) + printf("failed to map lcore %d\n", core); + } + } + + for ( ; i < PROFILE_CORES_MAX; i++) { + uint32_t core = i + core_off; + for (s = 0; s < NUM_SERVICES; s++) { + ret = rte_service_map_lcore_set(s, core, 0); + if (ret && ret != -EINVAL) { + printf("%s %d: map lcore set = %d\n", __func__, + __LINE__, ret); + } + } + ret = rte_service_lcore_stop(core); + if (ret && ret != -EALREADY) { + printf("%s %d: lcore stop = %d\n", __func__, + __LINE__, ret); + } + ret = rte_service_lcore_del(core); + if (ret && ret != -EINVAL) { + printf("%s %d: lcore del = %d\n", __func__, + __LINE__, ret); + } + } +} + +int +main(int argc, char **argv) +{ + int ret; + + ret = rte_eal_init(argc, argv); + if (ret < 0) + rte_panic("Cannot init EAL\n"); + + uint32_t i; + for (i = 0; i < NUM_SERVICES; i++) { + services[i].callback_userdata = 0; + uint32_t id; + ret = rte_service_component_register(&services[i], &id); + if (ret) + rte_exit(-1, "service register() failed"); + + /* set the service itself to be ready to run. In the case of + * ethdev, eventdev etc PMDs, this will be set when the + * appropriate configure or setup function is called. + */ + rte_service_component_runstate_set(id, 1); + + /* Collect statistics for the service */ + rte_service_set_stats_enable(id, 1); + + /* the application sets the service to be active. Note that the + * previous component_runstate_set() is the PMD indicating + * ready, while this function is the application setting the + * service to run. Applications can choose to not run a service + * by setting runstate to 0 at any time. + */ + ret = rte_service_runstate_set(id, 1); + if (ret) + return -ENOEXEC; + } + + i = 0; + while (1) { + const char clr[] = { 27, '[', '2', 'J', '\0' }; + const char topLeft[] = { 27, '[', '1', ';', '1', 'H', '\0' }; + printf("%s%s", clr, topLeft); + + apply_profile(i); + printf("\n==> Profile: %s\n\n", profiles[i].name); + + sleep(1); + rte_service_dump(stdout, UINT32_MAX); + + sleep(5); + rte_service_dump(stdout, UINT32_MAX); + + i++; + if (i >= NUM_PROFILES) + i = 0; + } + + return 0; +} |