[dpdk-dev] [PATCH v1 07/12] app/eventdev: use compiler atomic builtins for packets sync

[Joyce Kong <joyce.kong@arm.com>]

Convert rte_atomic usages to compiler atomic built-ins
for outstanding_pkts sync in eventdev cases.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 app/test-eventdev/evt_main.c          | 1 -
 app/test-eventdev/test_order_atq.c    | 4 ++--
 app/test-eventdev/test_order_common.c | 4 ++--
 app/test-eventdev/test_order_common.h | 8 ++++----
 app/test-eventdev/test_order_queue.c  | 4 ++--
 5 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/app/test-eventdev/evt_main.c b/app/test-eventdev/evt_main.c
index a8d304bab3..01434691e1 100644
--- a/app/test-eventdev/evt_main.c
+++ b/app/test-eventdev/evt_main.c
@@ -6,7 +6,6 @@
 #include <unistd.h>
 #include <signal.h>
 
-#include <rte_atomic.h>
 #include <rte_debug.h>
 #include <rte_eal.h>
 #include <rte_eventdev.h>
diff --git a/app/test-eventdev/test_order_atq.c b/app/test-eventdev/test_order_atq.c
index 71215a07b6..2fee4b4daa 100644
--- a/app/test-eventdev/test_order_atq.c
+++ b/app/test-eventdev/test_order_atq.c
@@ -28,7 +28,7 @@ order_atq_worker(void *arg, const bool flow_id_cap)
 		uint16_t event = rte_event_dequeue_burst(dev_id, port,
 					&ev, 1, 0);
 		if (!event) {
-			if (rte_atomic64_read(outstand_pkts) <= 0)
+			if (__atomic_load_n(outstand_pkts, __ATOMIC_RELAXED) <= 0)
 				break;
 			rte_pause();
 			continue;
@@ -64,7 +64,7 @@ order_atq_worker_burst(void *arg, const bool flow_id_cap)
 				BURST_SIZE, 0);
 
 		if (nb_rx == 0) {
-			if (rte_atomic64_read(outstand_pkts) <= 0)
+			if (__atomic_load_n(outstand_pkts, __ATOMIC_RELAXED) <= 0)
 				break;
 			rte_pause();
 			continue;
diff --git a/app/test-eventdev/test_order_common.c b/app/test-eventdev/test_order_common.c
index d7760061ba..ff7813f9c2 100644
--- a/app/test-eventdev/test_order_common.c
+++ b/app/test-eventdev/test_order_common.c
@@ -187,7 +187,7 @@ order_test_setup(struct evt_test *test, struct evt_options *opt)
 		evt_err("failed to allocate t->expected_flow_seq memory");
 		goto exp_nomem;
 	}
-	rte_atomic64_set(&t->outstand_pkts, opt->nb_pkts);
+	__atomic_store_n(&t->outstand_pkts, opt->nb_pkts, __ATOMIC_RELAXED);
 	t->err = false;
 	t->nb_pkts = opt->nb_pkts;
 	t->nb_flows = opt->nb_flows;
@@ -294,7 +294,7 @@ order_launch_lcores(struct evt_test *test, struct evt_options *opt,
 
 	while (t->err == false) {
 		uint64_t new_cycles = rte_get_timer_cycles();
-		int64_t remaining = rte_atomic64_read(&t->outstand_pkts);
+		int64_t remaining = __atomic_load_n(&t->outstand_pkts, __ATOMIC_RELAXED);
 
 		if (remaining <= 0) {
 			t->result = EVT_TEST_SUCCESS;
diff --git a/app/test-eventdev/test_order_common.h b/app/test-eventdev/test_order_common.h
index cd9d6009ec..1507265928 100644
--- a/app/test-eventdev/test_order_common.h
+++ b/app/test-eventdev/test_order_common.h
@@ -48,7 +48,7 @@ struct test_order {
 	 * The atomic_* is an expensive operation,Since it is a functional test,
 	 * We are using the atomic_ operation to reduce the code complexity.
 	 */
-	rte_atomic64_t outstand_pkts;
+	uint64_t outstand_pkts;
 	enum evt_test_result result;
 	uint32_t nb_flows;
 	uint64_t nb_pkts;
@@ -95,7 +95,7 @@ static __rte_always_inline void
 order_process_stage_1(struct test_order *const t,
 		struct rte_event *const ev, const uint32_t nb_flows,
 		uint32_t *const expected_flow_seq,
-		rte_atomic64_t *const outstand_pkts)
+		uint64_t *const outstand_pkts)
 {
 	const uint32_t flow = (uintptr_t)ev->mbuf % nb_flows;
 	/* compare the seqn against expected value */
@@ -113,7 +113,7 @@ order_process_stage_1(struct test_order *const t,
 	 */
 	expected_flow_seq[flow]++;
 	rte_pktmbuf_free(ev->mbuf);
-	rte_atomic64_sub(outstand_pkts, 1);
+	__atomic_fetch_sub(outstand_pkts, 1, __ATOMIC_RELAXED);
 }
 
 static __rte_always_inline void
@@ -132,7 +132,7 @@ order_process_stage_invalid(struct test_order *const t,
 	const uint8_t port = w->port_id;\
 	const uint32_t nb_flows = t->nb_flows;\
 	uint32_t *expected_flow_seq = t->expected_flow_seq;\
-	rte_atomic64_t *outstand_pkts = &t->outstand_pkts;\
+	uint64_t *outstand_pkts = &t->outstand_pkts;\
 	if (opt->verbose_level > 1)\
 		printf("%s(): lcore %d dev_id %d port=%d\n",\
 			__func__, rte_lcore_id(), dev_id, port)
diff --git a/app/test-eventdev/test_order_queue.c b/app/test-eventdev/test_order_queue.c
index 621367805a..80eaea5cf5 100644
--- a/app/test-eventdev/test_order_queue.c
+++ b/app/test-eventdev/test_order_queue.c
@@ -28,7 +28,7 @@ order_queue_worker(void *arg, const bool flow_id_cap)
 		uint16_t event = rte_event_dequeue_burst(dev_id, port,
 					&ev, 1, 0);
 		if (!event) {
-			if (rte_atomic64_read(outstand_pkts) <= 0)
+			if (__atomic_load_n(outstand_pkts, __ATOMIC_RELAXED) <= 0)
 				break;
 			rte_pause();
 			continue;
@@ -64,7 +64,7 @@ order_queue_worker_burst(void *arg, const bool flow_id_cap)
 				BURST_SIZE, 0);
 
 		if (nb_rx == 0) {
-			if (rte_atomic64_read(outstand_pkts) <= 0)
+			if (__atomic_load_n(outstand_pkts, __ATOMIC_RELAXED) <= 0)
 				break;
 			rte_pause();
 			continue;
-- 
2.17.1