eal: set affinity for control threads

[dpdk.git] / lib / librte_eal / common / eal_common_thread.c

diff --git a/lib/librte_eal/common/eal_common_thread.c b/lib/librte_eal/common/eal_common_thread.c
index 40902e4..4e75cb8 100644 (file)
--- a/lib/librte_eal/common/eal_common_thread.c
+++ b/lib/librte_eal/common/eal_common_thread.c
@@ -7,6 +7,7 @@
 #include <stdint.h>
 #include <unistd.h>
 #include <pthread.h>
+#include <signal.h>
 #include <sched.h>
 #include <assert.h>
 #include <string.h>
@@ -15,6 +16,7 @@
 #include <rte_memory.h>
 #include <rte_log.h>
 
+#include "eal_private.h"
 #include "eal_thread.h"
 
 RTE_DECLARE_PER_LCORE(unsigned , _socket_id);
@@ -140,3 +142,73 @@ exit:
 
        return ret;
 }
+
+
+struct rte_thread_ctrl_params {
+       void *(*start_routine)(void *);
+       void *arg;
+       pthread_barrier_t configured;
+};
+
+static void *rte_thread_init(void *arg)
+{
+       struct rte_thread_ctrl_params *params = arg;
+       void *(*start_routine)(void *) = params->start_routine;
+       void *routine_arg = params->arg;
+
+       pthread_barrier_wait(&params->configured);
+
+       return start_routine(routine_arg);
+}
+
+__rte_experimental int
+rte_ctrl_thread_create(pthread_t *thread, const char *name,
+               const pthread_attr_t *attr,
+               void *(*start_routine)(void *), void *arg)
+{
+       struct rte_thread_ctrl_params params = {
+               .start_routine = start_routine,
+               .arg = arg,
+       };
+       unsigned int lcore_id;
+       rte_cpuset_t cpuset;
+       int cpu_found, ret;
+
+       pthread_barrier_init(&params.configured, NULL, 2);
+
+       ret = pthread_create(thread, attr, rte_thread_init, (void *)&params);
+       if (ret != 0)
+               return ret;
+
+       if (name != NULL) {
+               ret = rte_thread_setname(*thread, name);
+               if (ret < 0)
+                       goto fail;
+       }
+
+       cpu_found = 0;
+       CPU_ZERO(&cpuset);
+       for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
+               if (eal_cpu_detected(lcore_id) &&
+                               rte_lcore_has_role(lcore_id, ROLE_OFF)) {
+                       CPU_SET(lcore_id, &cpuset);
+                       cpu_found = 1;
+               }
+       }
+       /* if no detected cpu is off, use master core */
+       if (!cpu_found)
+               CPU_SET(rte_get_master_lcore(), &cpuset);
+
+       ret = pthread_setaffinity_np(*thread, sizeof(cpuset), &cpuset);
+       if (ret < 0)
+               goto fail;
+
+       pthread_barrier_wait(&params.configured);
+
+       return 0;
+
+fail:
+       pthread_cancel(*thread);
+       pthread_join(*thread, NULL);
+       return ret;
+}