--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * 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 <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <sched.h>
+#include <sys/queue.h>
+#include <sys/syscall.h>
+
+#include <rte_debug.h>
+#include <rte_atomic.h>
+#include <rte_launch.h>
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_per_lcore.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+
+#include "eal_private.h"
+#include "eal_thread.h"
+
+RTE_DEFINE_PER_LCORE(unsigned, _lcore_id) = LCORE_ID_ANY;
+RTE_DEFINE_PER_LCORE(unsigned, _socket_id) = (unsigned)SOCKET_ID_ANY;
+RTE_DEFINE_PER_LCORE(rte_cpuset_t, _cpuset);
+
+/*
+ * Send a message to a slave lcore identified by slave_id to call a
+ * function f with argument arg. Once the execution is done, the
+ * remote lcore switch in FINISHED state.
+ */
+int
+rte_eal_remote_launch(int (*f)(void *), void *arg, unsigned slave_id)
+{
+ int n;
+ char c = 0;
+ int m2s = lcore_config[slave_id].pipe_master2slave[1];
+ int s2m = lcore_config[slave_id].pipe_slave2master[0];
+
+ if (lcore_config[slave_id].state != WAIT)
+ return -EBUSY;
+
+ lcore_config[slave_id].f = f;
+ lcore_config[slave_id].arg = arg;
+
+ /* send message */
+ n = 0;
+ while (n == 0 || (n < 0 && errno == EINTR))
+ n = write(m2s, &c, 1);
+ if (n < 0)
+ rte_panic("cannot write on configuration pipe\n");
+
+ /* wait ack */
+ do {
+ n = read(s2m, &c, 1);
+ } while (n < 0 && errno == EINTR);
+
+ if (n <= 0)
+ rte_panic("cannot read on configuration pipe\n");
+
+ return 0;
+}
+
+/* set affinity for current EAL thread */
+static int
+eal_thread_set_affinity(void)
+{
+ unsigned lcore_id = rte_lcore_id();
+
+ /* acquire system unique id */
+ rte_gettid();
+
+ /* update EAL thread core affinity */
+ return rte_thread_set_affinity(&lcore_config[lcore_id].cpuset);
+}
+
+void eal_thread_init_master(unsigned lcore_id)
+{
+ /* set the lcore ID in per-lcore memory area */
+ RTE_PER_LCORE(_lcore_id) = lcore_id;
+
+ /* set CPU affinity */
+ if (eal_thread_set_affinity() < 0)
+ rte_panic("cannot set affinity\n");
+}
+
+/* main loop of threads */
+__attribute__((noreturn)) void *
+eal_thread_loop(__attribute__((unused)) void *arg)
+{
+ char c;
+ int n, ret;
+ unsigned lcore_id;
+ pthread_t thread_id;
+ int m2s, s2m;
+ char cpuset[RTE_CPU_AFFINITY_STR_LEN];
+
+ thread_id = pthread_self();
+
+ /* retrieve our lcore_id from the configuration structure */
+ RTE_LCORE_FOREACH_SLAVE(lcore_id) {
+ if (thread_id == lcore_config[lcore_id].thread_id)
+ break;
+ }
+ if (lcore_id == RTE_MAX_LCORE)
+ rte_panic("cannot retrieve lcore id\n");
+
+ m2s = lcore_config[lcore_id].pipe_master2slave[0];
+ s2m = lcore_config[lcore_id].pipe_slave2master[1];
+
+ /* set the lcore ID in per-lcore memory area */
+ RTE_PER_LCORE(_lcore_id) = lcore_id;
+
+ /* set CPU affinity */
+ if (eal_thread_set_affinity() < 0)
+ rte_panic("cannot set affinity\n");
+
+ ret = eal_thread_dump_affinity(cpuset, RTE_CPU_AFFINITY_STR_LEN);
+
+ RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%x;cpuset=[%s%s])\n",
+ lcore_id, (int)thread_id, cpuset, ret == 0 ? "" : "...");
+
+ /* read on our pipe to get commands */
+ while (1) {
+ void *fct_arg;
+
+ /* wait command */
+ do {
+ n = read(m2s, &c, 1);
+ } while (n < 0 && errno == EINTR);
+
+ if (n <= 0)
+ rte_panic("cannot read on configuration pipe\n");
+
+ lcore_config[lcore_id].state = RUNNING;
+
+ /* send ack */
+ n = 0;
+ while (n == 0 || (n < 0 && errno == EINTR))
+ n = write(s2m, &c, 1);
+ if (n < 0)
+ rte_panic("cannot write on configuration pipe\n");
+
+ if (lcore_config[lcore_id].f == NULL)
+ rte_panic("NULL function pointer\n");
+
+ /* call the function and store the return value */
+ fct_arg = lcore_config[lcore_id].arg;
+ ret = lcore_config[lcore_id].f(fct_arg);
+ lcore_config[lcore_id].ret = ret;
+ rte_wmb();
+ lcore_config[lcore_id].state = FINISHED;
+ }
+
+ /* never reached */
+ /* pthread_exit(NULL); */
+ /* return NULL; */
+}
+
+/* require calling thread tid by gettid() */
+int rte_sys_gettid(void)
+{
+ return (int)syscall(SYS_gettid);
+}
Code Review / deb_dpdk.git / blobdiff