1 files changed, 313 insertions, 0 deletions
diff --git a/examples/multi_process/l2fwd_fork/flib.c b/examples/multi_process/l2fwd_fork/flib.c
new file mode 100644
index 00000000..343f09f1
--- /dev/null
+++ b/examples/multi_process/l2fwd_fork/flib.c
@@ -0,0 +1,313 @@
+/*-
+ *   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 <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/wait.h>
+#include <sys/prctl.h>
+#include <netinet/in.h>
+#include <setjmp.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <errno.h>
+#include <getopt.h>
+#include <dirent.h>
+#include <signal.h>
+
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_malloc.h>
+#include <rte_memory.h>
+#include <rte_memcpy.h>
+#include <rte_memzone.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_launch.h>
+#include <rte_atomic.h>
+#include <rte_cycles.h>
+#include <rte_prefetch.h>
+#include <rte_lcore.h>
+#include <rte_per_lcore.h>
+#include <rte_branch_prediction.h>
+#include <rte_interrupts.h>
+#include <rte_pci.h>
+#include <rte_random.h>
+#include <rte_debug.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_ring.h>
+#include <rte_mempool.h>
+#include <rte_mbuf.h>
+#include <rte_string_fns.h>
+
+#include "flib.h"
+
+#define SIG_PARENT_EXIT SIGUSR1
+
+struct lcore_stat {
+	pid_t pid;           /**< pthread identifier */
+	lcore_function_t *f; /**< function to call */
+	void *arg;           /**< argument of function */
+	slave_exit_notify *cb_fn;
+} __rte_cache_aligned;
+
+
+static struct lcore_stat *core_cfg;
+static uint16_t *lcore_cfg = NULL;
+
+/* signal handler to be notified after parent leaves */
+static void
+sighand_parent_exit(int sig)
+{
+	printf("lcore = %u : Find parent leaves, sig=%d\n", rte_lcore_id(),
+			sig);
+	printf("Child leaving\n");
+	exit(0);
+
+	return;
+}
+
+/**
+ * Real function entrance ran in slave process
+ **/
+static int
+slave_proc_func(void)
+{
+	struct rte_config *config;
+	unsigned slave_id = rte_lcore_id();
+	struct lcore_stat *cfg = &core_cfg[slave_id];
+
+	if (prctl(PR_SET_PDEATHSIG, SIG_PARENT_EXIT, 0, 0, 0, 0) != 0)
+		printf("Warning: Slave can't register for being notified in"
+               "case master process exited\n");
+	else {
+		struct sigaction act;
+		memset(&act, 0 , sizeof(act));
+		act.sa_handler = sighand_parent_exit;
+		if (sigaction(SIG_PARENT_EXIT, &act, NULL) != 0)
+			printf("Fail to register signal handler:%d\n", SIG_PARENT_EXIT);
+	}
+
+	/* Set slave process to SECONDARY to avoid operation like dev_start/stop etc */
+	config = rte_eal_get_configuration();
+	if (NULL == config)
+		printf("Warning:Can't get rte_config\n");
+	else
+		config->process_type = RTE_PROC_SECONDARY;
+
+	printf("Core %u is ready (pid=%d)\n", slave_id, (int)cfg->pid);
+
+	exit(cfg->f(cfg->arg));
+}
+
+/**
+ * function entrance ran in master thread, which will spawn slave process and wait until
+ * specific slave exited.
+ **/
+static int
+lcore_func(void *arg __attribute__((unused)))
+{
+	unsigned slave_id = rte_lcore_id();
+	struct lcore_stat *cfg = &core_cfg[slave_id];
+	int pid, stat;
+
+	if (rte_get_master_lcore() == slave_id)
+		return cfg->f(cfg->arg);
+
+	/* fork a slave process */
+	pid = fork();
+
+	if (pid == -1) {
+		printf("Failed to fork\n");
+		return -1;
+	} else if (pid == 0) /* child */
+		return slave_proc_func();
+	else { /* parent */
+		cfg->pid = pid;
+
+		waitpid(pid, &stat, 0);
+
+		cfg->pid = 0;
+		cfg->f = NULL;
+		cfg->arg = NULL;
+		/* Notify slave's exit if applicable */
+		if(cfg->cb_fn)
+			cfg->cb_fn(slave_id, stat);
+		return stat;
+	}
+}
+
+static int
+lcore_id_init(void)
+{
+	int i;
+	/* Setup lcore ID allocation map */
+	lcore_cfg = rte_zmalloc("LCORE_ID_MAP",
+						sizeof(uint16_t) * RTE_MAX_LCORE,
+						RTE_CACHE_LINE_SIZE);
+
+	if(lcore_cfg == NULL)
+		rte_panic("Failed to malloc\n");
+
+	for (i = 0; i < RTE_MAX_LCORE; i++) {
+		if (rte_lcore_is_enabled(i))
+			lcore_cfg[i] = 1;
+	}
+	return 0;
+}
+
+int
+flib_assign_lcore_id(void)
+{
+	unsigned i;
+	int ret;
+
+	/**
+	 * thread assigned a lcore id previously, or a  slave thread. But still have
+	 * a bug here: If the core mask includes core 0, and that core call this
+	 * function, it still can get a new lcore id.
+	 **/
+	if (rte_lcore_id() != 0)
+		return -1;
+
+	do {
+		/* Find a lcore id not used yet, avoid to use lcore ID 0 */
+		for (i = 1; i < RTE_MAX_LCORE; i++) {
+			if (lcore_cfg[i] == 0)
+				break;
+		}
+		if (i == RTE_MAX_LCORE)
+			return -1;
+
+		/* Assign new lcore id to this thread */
+
+		ret = rte_atomic16_cmpset(&lcore_cfg[i], 0, 1);
+	} while (unlikely(ret == 0));
+
+	RTE_PER_LCORE(_lcore_id) = i;
+	return i;
+}
+
+void
+flib_free_lcore_id(unsigned lcore_id)
+{
+	/* id is not valid or belongs to pinned core id */
+	if (lcore_id >= RTE_MAX_LCORE || lcore_id == 0 ||
+		rte_lcore_is_enabled(lcore_id))
+		return;
+
+	lcore_cfg[lcore_id] = 0;
+}
+
+int
+flib_register_slave_exit_notify(unsigned slave_id,
+	slave_exit_notify *cb)
+{
+	if (cb == NULL)
+		return -EFAULT;
+
+	if (!rte_lcore_is_enabled(slave_id))
+		return -ENOENT;
+
+	core_cfg[slave_id].cb_fn = cb;
+
+	return 0;
+}
+
+enum slave_stat
+flib_query_slave_status(unsigned slave_id)
+{
+	if (!rte_lcore_is_enabled(slave_id))
+		return ST_FREEZE;
+	/* pid only be set when slave process spawned */
+	if (core_cfg[slave_id].pid != 0)
+		return ST_RUN;
+	else
+		return ST_IDLE;
+}
+
+int
+flib_remote_launch(lcore_function_t *f,
+					void *arg, unsigned slave_id)
+{
+	if (f == NULL)
+		return -1;
+
+	if (!rte_lcore_is_enabled(slave_id))
+		return -1;
+
+	/* Wait until specific lcore state change to WAIT */
+	rte_eal_wait_lcore(slave_id);
+
+	core_cfg[slave_id].f = f;
+	core_cfg[slave_id].arg = arg;
+
+	return rte_eal_remote_launch(lcore_func, NULL, slave_id);
+}
+
+int
+flib_mp_remote_launch(lcore_function_t *f, void *arg,
+			enum rte_rmt_call_master_t call_master)
+{
+	int i;
+
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		core_cfg[i].arg = arg;
+		core_cfg[i].f = f;
+	}
+
+	return rte_eal_mp_remote_launch(lcore_func, NULL, call_master);
+}
+
+int
+flib_init(void)
+{
+	if ((core_cfg = rte_zmalloc("core_cfg",
+		sizeof(struct lcore_stat) * RTE_MAX_LCORE,
+		RTE_CACHE_LINE_SIZE)) == NULL ) {
+		printf("rte_zmalloc failed\n");
+		return -1;
+	}
+
+	if (lcore_id_init() != 0) {
+		printf("lcore_id_init failed\n");
+		return -1;
+	}
+
+	return 0;
+}