[dpdk-dev] [PATCH v3] examples/eventdev: refactor ethdev port stop

Feifei Wang feifei.wang2 at arm.com
Tue Jan 5 06:14:01 CET 2021


Move eth stop code from "signal_handler" function to the end of "main"
function. There are two reasons for this:

First, this improves code maintenance and makes code look simple and
clear. Based on this change, after receiving the interrupt signal,
"fdata->done" is set as 1. Then the main thread will wait all worker
lcores to jump out of the loop. Finally, the main thread will stop and
then close eth dev port.

Second, for older version, the main thread first stops eth dev port and
then waits the end of worker lcore. This may cause errors because it may
stop the eth dev port which worker lcores are using. This moving change
can fix this by waiting all worker threads to exit and then stop the
eth dev port.

In the meanwhile, remove wmb in signal_handler.

This is because when the main lcore receive the stop signal, it stores 1
into fdata->done. And then the worker lcores load "fdata->done" and jump
out of the loop to stop running. Nothing should be stored after updating
fdata->done, so the wmb is unnecessary.

Fixes: 085edac2ca38 ("examples/eventdev_pipeline: support Tx adapter")
Cc: pbhagavatula at marvell.com
Cc: stable at dpdk.org

Suggested-by: Ruifeng Wang <ruifeng.wang at arm.com>
Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
Acked-by: Harry van Haaren <harry.van.haaren at intel.com>
---

v2:
1. Delete unused variable to fix build error
2. Reduce commit message length to fix coding style issues

v3:
1. Title improvement (Van Haaren)

 examples/eventdev_pipeline/main.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/examples/eventdev_pipeline/main.c b/examples/eventdev_pipeline/main.c
index 823f8b51c..fdbaf667b 100644
--- a/examples/eventdev_pipeline/main.c
+++ b/examples/eventdev_pipeline/main.c
@@ -280,7 +280,6 @@ static void
 signal_handler(int signum)
 {
 	static uint8_t once;
-	uint16_t portid;
 
 	if (fdata->done)
 		rte_exit(1, "Exiting on signal %d\n", signum);
@@ -291,17 +290,6 @@ signal_handler(int signum)
 			rte_event_dev_dump(0, stdout);
 		once = 1;
 		fdata->done = 1;
-		rte_smp_wmb();
-
-		RTE_ETH_FOREACH_DEV(portid) {
-			rte_event_eth_rx_adapter_stop(portid);
-			rte_event_eth_tx_adapter_stop(portid);
-			if (rte_eth_dev_stop(portid) < 0)
-				printf("Failed to stop port %u", portid);
-		}
-
-		rte_eal_mp_wait_lcore();
-
 	}
 	if (signum == SIGTSTP)
 		rte_event_dev_dump(0, stdout);
@@ -465,6 +453,10 @@ main(int argc, char **argv)
 	}
 
 	RTE_ETH_FOREACH_DEV(portid) {
+		rte_event_eth_rx_adapter_stop(portid);
+		rte_event_eth_tx_adapter_stop(portid);
+		if (rte_eth_dev_stop(portid) < 0)
+			printf("Failed to stop port %u", portid);
 		rte_eth_dev_close(portid);
 	}
 
-- 
2.25.1



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