[dpdk-dev] [PATCH v2] app/flow-perf: fix condition of hairpin queues setup

[Wisam Jaddo]

The hairpin queue is the one that start from normal rxq,
and will be less than nr_queues where nr_queues is the
sum of normal and hairpin

Fixes: bf3688f1e816 ("app/flow-perf: add insertion rate calculation")
Cc: wisamm at mellanox.com

Signed-off-by: Wisam Jaddo <wisamm at mellanox.com>
Reviewed-by: Asaf Penso <asafp at mellanox.com>

---
v2:
* Add documentation of hairpin peering and allocating logic.
* Add documentation for some variables.
---
 app/test-flow-perf/main.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/app/test-flow-perf/main.c b/app/test-flow-perf/main.c
index e155e49c37..8f12ee10f1 100644
--- a/app/test-flow-perf/main.c
+++ b/app/test-flow-perf/main.c
@@ -1012,8 +1012,26 @@ init_port(void)
 				rte_strerror(-ret), port_id);
 
 		if (hairpinq != 0) {
+			/* Each hairpin queue setup need a hairpin configuration
+			 * object, which determine the TX path for hairpin.
+			 *
+			 * The peering here represent the TX side, which mean the
+			 * peer.port represent TX port, and peer.queue represent
+			 * tx_queue.
+			 *
+			 * So if RXQ=4 and TXQ=4, and first hairpin_q is 4 after
+			 * [0, 1, 2, 3], then tx_queue is TXQ+i which is 4 as well.
+			 *
+			 * hairpinq: represent the number of hairpin queues needed
+			 * to be initialized.
+			 *
+			 * In 0 case means no hairpin queues needed which is the
+			 * default.
+			 *
+			 * hairpin_q: represent hairpin queue id to be initialized.
+			 */
 			for (hairpin_q = RXQ_NUM, std_queue = 0;
-					std_queue < nr_queues;
+					hairpin_q < nr_queues;
 					hairpin_q++, std_queue++) {
 				hairpin_conf.peers[0].port = port_id;
 				hairpin_conf.peers[0].queue =
@@ -1028,7 +1046,7 @@ init_port(void)
 			}
 
 			for (hairpin_q = TXQ_NUM, std_queue = 0;
-					std_queue < nr_queues;
+					hairpin_q < nr_queues;
 					hairpin_q++, std_queue++) {
 				hairpin_conf.peers[0].port = port_id;
 				hairpin_conf.peers[0].queue =
-- 
2.17.1