examples/flow_filtering: add delay to wait link update

Add up to 9s delay for getting link status to make sure NIC updates
link status successfully, just like other applications such as
testpmd and l2fwd.

Signed-off-by: Beilei Xing <beilei.xing@intel.com>
Acked-by: Ori Kam <orika@mellanox.com>

diff --git a/examples/flow_filtering/main.c b/examples/flow_filtering/main.c
index cc955cd..0bb81a8 100644 (file)
--- a/examples/flow_filtering/main.c
+++ b/examples/flow_filtering/main.c
@@ -55,6 +55,7 @@
 #include <rte_mbuf.h>
 #include <rte_net.h>
 #include <rte_flow.h>
+#include <rte_cycles.h>
 
 static volatile bool force_quit;
 
@@ -119,13 +120,23 @@ main_loop(void)
        rte_eth_dev_close(port_id);
 }
 
+#define CHECK_INTERVAL 1000  /* 100ms */
+#define MAX_REPEAT_TIMES 90  /* 9s (90 * 100ms) in total */
+
 static void
 assert_link_status(void)
 {
        struct rte_eth_link link;
+       uint8_t rep_cnt = MAX_REPEAT_TIMES;
 
        memset(&link, 0, sizeof(link));
-       rte_eth_link_get(port_id, &link);
+       do {
+               rte_eth_link_get(port_id, &link);
+               if (link.link_status == ETH_LINK_UP)
+                       break;
+               rte_delay_ms(CHECK_INTERVAL);
+       } while (--rep_cnt);
+
        if (link.link_status == ETH_LINK_DOWN)
                rte_exit(EXIT_FAILURE, ":: error: link is still down\n");
 }