[dpdk-dev] [PATCH v2] l3fwd-power: add Rx interrupt timeout

[Anatoly Burakov]

Currently, thread waiting on an interrupt does not have a timeout, so
it will not ever wake up until traffic arrives. This means that, when
time comes to exit the application, it will not quit unless there
happens to be traffic coming in and waking up the thread from sleep.

Fix it so that the interrupt thread sleeps for 10ms before waking up
and attempting to poll again. Additionally, remove the log message
to avoid spamming about entering interrupt mode.

Fixes: 613ce6691c0d ("examples/l3fwd-power: implement proper shutdown")
Cc: stable at dpdk.org

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 examples/l3fwd-power/main.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index 293b3da4ae..21fb15e1a2 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -829,11 +829,7 @@ sleep_until_rx_interrupt(int num)
 	uint8_t queue_id;
 	void *data;
 
-	RTE_LOG(INFO, L3FWD_POWER,
-		"lcore %u sleeps until interrupt triggers\n",
-		rte_lcore_id());
-
-	n = rte_epoll_wait(RTE_EPOLL_PER_THREAD, event, num, -1);
+	n = rte_epoll_wait(RTE_EPOLL_PER_THREAD, event, num, 10);
 	for (i = 0; i < n; i++) {
 		data = event[i].epdata.data;
 		port_id = ((uintptr_t)data) >> CHAR_BIT;
@@ -1306,7 +1302,8 @@ main_loop(__rte_unused void *dummy)
 					/**
 					 * start receiving packets immediately
 					 */
-					goto start_rx;
+					if (likely(!is_done()))
+						goto start_rx;
 				}
 			}
 			stats[lcore_id].sleep_time += lcore_idle_hint;
-- 
2.17.1