[dpdk-dev] [PATCH v2 2/3] examples/l2fwd: Handle SIGINT and SIGTERM in l2fwd

[Zhihong Wang <zhihong.wang@intel.com>]

Handle SIGINT and SIGTERM in l2fwd.

Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>
---
 examples/l2fwd/main.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/examples/l2fwd/main.c b/examples/l2fwd/main.c
index 720fd5a..75899dd 100644
--- a/examples/l2fwd/main.c
+++ b/examples/l2fwd/main.c
@@ -44,6 +44,8 @@
 #include <ctype.h>
 #include <errno.h>
 #include <getopt.h>
+#include <signal.h>
+#include <unistd.h>
 
 #include <rte_common.h>
 #include <rte_log.h>
@@ -69,6 +71,9 @@
 #include <rte_mempool.h>
 #include <rte_mbuf.h>
 
+static int force_quit = -1;
+static int signo_quit = -1;
+
 #define RTE_LOGTYPE_L2FWD RTE_LOGTYPE_USER1
 
 #define NB_MBUF   8192
@@ -284,6 +289,8 @@ l2fwd_main_loop(void)
 	}
 
 	while (1) {
+		if (unlikely(force_quit != 0))
+			break;
 
 		cur_tsc = rte_rdtsc();
 
@@ -534,6 +541,45 @@ check_all_ports_link_status(uint8_t port_num, uint32_t port_mask)
 	}
 }
 
+static void
+stop_ports(void)
+{
+	unsigned portid, nb_ports;
+
+	nb_ports = rte_eth_dev_count();
+	for (portid = 0; portid < nb_ports; portid++) {
+		if ((l2fwd_enabled_port_mask & (1 << portid)) == 0) {
+			continue;
+		}
+		printf("Stopping port %d...", portid);
+		rte_eth_dev_stop(portid);
+		rte_eth_dev_close(portid);
+		printf(" Done\n");
+	}
+}
+
+static void
+signal_handler(__rte_unused int signum)
+{
+	if (signum == SIGINT || signum == SIGTERM) {
+		printf("\nSignal %d received, preparing to exit...\n",
+				signum);
+		if (force_quit < 0) {
+			printf("Forwarding not started yet...\n");
+			/* stop ports */
+			stop_ports();
+			printf("Bye...\n");
+			/* inform if there's a caller */
+			signal(signum, SIG_DFL);
+			kill(getpid(), signum);
+		} else {
+			printf("Forwarding started already...\n");
+			signo_quit = signum;
+			force_quit = 1;
+		}
+	}
+}
+
 int
 main(int argc, char **argv)
 {
@@ -546,6 +592,9 @@ main(int argc, char **argv)
 	unsigned lcore_id, rx_lcore_id;
 	unsigned nb_ports_in_mask = 0;
 
+	signal(SIGINT, signal_handler);
+	signal(SIGTERM, signal_handler);
+
 	/* init EAL */
 	ret = rte_eal_init(argc, argv);
 	if (ret < 0)
@@ -697,11 +746,22 @@ main(int argc, char **argv)
 	check_all_ports_link_status(nb_ports, l2fwd_enabled_port_mask);
 
 	/* launch per-lcore init on every lcore */
+	force_quit = 0;
 	rte_eal_mp_remote_launch(l2fwd_launch_one_lcore, NULL, CALL_MASTER);
 	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
 		if (rte_eal_wait_lcore(lcore_id) < 0)
 			return -1;
 	}
 
+	printf("Stopping forwarding... Done\n");
+	/* stop ports */
+	stop_ports();
+	printf("Bye...\n");
+	/* inform if there's a caller */
+	if (force_quit != 0) {
+		signal(signo_quit, SIG_DFL);
+		kill(getpid(), signo_quit);
+	}
+
 	return 0;
 }
-- 
2.5.0