test/pmd_perf: use compiler atomic builtins for polling sync

Convert rte_atomic usages to compiler atomic built-ins
for polling sync in pmd_perf test cases.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>

diff --git a/app/test/test_pmd_perf.c b/app/test/test_pmd_perf.c
index aac6c97cebd32bc213d6736eb4165f159c3b44ab..0aa9dc1b1cbb6832ea5f6e43bbbd2081e4324d3e 100644 (file)
--- a/app/test/test_pmd_perf.c
+++ b/app/test/test_pmd_perf.c
@@ -10,7 +10,6 @@
 #include <rte_cycles.h>
 #include <rte_ethdev.h>
 #include <rte_byteorder.h>
-#include <rte_atomic.h>
 #include <rte_malloc.h>
 #include "packet_burst_generator.h"
 #include "test.h"
@@ -525,7 +524,7 @@ main_loop(__rte_unused void *args)
        return 0;
 }
 
-static rte_atomic64_t start;
+static uint64_t start;
 
 static inline int
 poll_burst(void *args)
@@ -563,8 +562,7 @@ poll_burst(void *args)
                num[portid] = pkt_per_port;
        }
 
-       while (!rte_atomic64_read(&start))
-               ;
+       rte_wait_until_equal_64(&start, 1, __ATOMIC_ACQUIRE);
 
        cur_tsc = rte_rdtsc();
        while (total) {
@@ -616,16 +614,19 @@ exec_burst(uint32_t flags, int lcore)
        pkt_per_port = MAX_TRAFFIC_BURST;
        num = pkt_per_port * conf->nb_ports;
 
-       rte_atomic64_init(&start);
+       /* only when polling first */
+       if (flags == SC_BURST_POLL_FIRST)
+               __atomic_store_n(&start, 1, __ATOMIC_RELAXED);
+       else
+               __atomic_store_n(&start, 0, __ATOMIC_RELAXED);
 
-       /* start polling thread, but not actually poll yet */
+       /* start polling thread
+        * if in POLL_FIRST mode, poll once launched;
+        * otherwise, not actually poll yet
+        */
        rte_eal_remote_launch(poll_burst,
                              (void *)&pkt_per_port, lcore);
 
-       /* Only when polling first */
-       if (flags == SC_BURST_POLL_FIRST)
-               rte_atomic64_set(&start, 1);
-
        /* start xmit */
        i = 0;
        while (num) {
@@ -641,7 +642,7 @@ exec_burst(uint32_t flags, int lcore)
 
        /* only when polling second  */
        if (flags == SC_BURST_XMIT_FIRST)
-               rte_atomic64_set(&start, 1);
+               __atomic_store_n(&start, 1, __ATOMIC_RELEASE);
 
        /* wait for polling finished */
        diff_tsc = rte_eal_wait_lcore(lcore);