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From: Joyce Kong <joyce.kong@arm.com>
To: thomas@monjalon.net, david.marchand@redhat.com, stephen@networkplumber.org,
olivier.matz@6wind.com, andrew.rybchenko@oktetlabs.ru,
harry.van.haaren@intel.com, honnappa.nagarahalli@arm.com,
ruifeng.wang@arm.com
Cc: dev@dpdk.org,
nd@arm.com
Date: Tue, 15 Jun 2021 21:54:58 -0500
Message-Id: <20210616025459.22717-8-joyce.kong@arm.com>
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<20210616025459.22717-1-joyce.kong@arm.com>
Subject: [dpdk-dev] [PATCH v2 7/8] test/service_cores: use GCC atomic
builtins for lock sync
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Convert rte_atomic usages to GCC atomic builtins for lock sync
in service core testcases.
Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
app/test/test_service_cores.c | 36 +++++++++++++++++++----------------
1 file changed, 20 insertions(+), 16 deletions(-)
diff --git a/app/test/test_service_cores.c b/app/test/test_service_cores.c
index 37d7172d5..9d908d44e 100644
--- a/app/test/test_service_cores.c
+++ b/app/test/test_service_cores.c
@@ -53,18 +53,20 @@ static int32_t dummy_cb(void *args)
static int32_t dummy_mt_unsafe_cb(void *args)
{
/* before running test, the initialization has set pass_test to 1.
- * If the cmpset in service-cores is working correctly, the code here
+ * If the cas in service-cores is working correctly, the code here
* should never fail to take the lock. If the lock *is* taken, fail the
* test, because two threads are concurrently in a non-MT safe callback.
*/
uint32_t *test_params = args;
- uint32_t *atomic_lock = &test_params[0];
+ uint32_t *lock = &test_params[0];
uint32_t *pass_test = &test_params[1];
- int lock_taken = rte_atomic32_cmpset(atomic_lock, 0, 1);
+ uint32_t exp = 0;
+ int lock_taken = __atomic_compare_exchange_n(lock, &exp, 1, 0,
+ __ATOMIC_RELAXED, __ATOMIC_RELAXED);
if (lock_taken) {
/* delay with the lock held */
rte_delay_ms(250);
- rte_atomic32_clear((rte_atomic32_t *)atomic_lock);
+ __atomic_store_n(lock, 0, __ATOMIC_RELAXED);
} else {
/* 2nd thread will fail to take lock, so set pass flag */
*pass_test = 0;
@@ -83,13 +85,15 @@ static int32_t dummy_mt_safe_cb(void *args)
* that 2 threads are running the callback at the same time: MT safe
*/
uint32_t *test_params = args;
- uint32_t *atomic_lock = &test_params[0];
+ uint32_t *lock = &test_params[0];
uint32_t *pass_test = &test_params[1];
- int lock_taken = rte_atomic32_cmpset(atomic_lock, 0, 1);
+ uint32_t exp = 0;
+ int lock_taken = __atomic_compare_exchange_n(lock, &exp, 1, 0,
+ __ATOMIC_RELAXED, __ATOMIC_RELAXED);
if (lock_taken) {
/* delay with the lock held */
rte_delay_ms(250);
- rte_atomic32_clear((rte_atomic32_t *)atomic_lock);
+ __atomic_store_n(lock, 0, __ATOMIC_RELAXED);
} else {
/* 2nd thread will fail to take lock, so set pass flag */
*pass_test = 1;
@@ -622,9 +626,9 @@ service_threaded_test(int mt_safe)
TEST_ASSERT_EQUAL(0, rte_service_lcore_add(slcore_2),
"mt safe lcore add fail");
- /* Use atomic locks to verify that two threads are in the same function
- * at the same time. These are passed to the unit tests through the
- * callback userdata parameter
+ /* Use locks to verify that two threads are in the same function
+ * at the same time. These are passed to the unit tests through
+ * the callback userdata parameter.
*/
uint32_t test_params[2];
memset(test_params, 0, sizeof(uint32_t) * 2);
@@ -713,7 +717,7 @@ service_mt_safe_poll(void)
}
/* tests a NON mt safe service with two cores, the callback is serialized
- * using the atomic cmpset.
+ * using the cas.
*/
static int
service_mt_unsafe_poll(void)
@@ -735,17 +739,17 @@ delay_as_a_mt_safe_service(void *args)
RTE_SET_USED(args);
uint32_t *params = args;
- /* retrieve done flag and atomic lock to inc/dec */
+ /* retrieve done flag and lock to add/sub */
uint32_t *done = ¶ms[0];
- rte_atomic32_t *lock = (rte_atomic32_t *)¶ms[1];
+ uint32_t *lock = ¶ms[1];
while (!*done) {
- rte_atomic32_inc(lock);
+ __atomic_add_fetch(lock, 1, __ATOMIC_RELAXED);
rte_delay_us(500);
- if (rte_atomic32_read(lock) > 1)
+ if (__atomic_load_n(lock, __ATOMIC_RELAXED) > 1)
/* pass: second core has simultaneously incremented */
*done = 1;
- rte_atomic32_dec(lock);
+ __atomic_sub_fetch(lock, 1, __ATOMIC_RELAXED);
}
return 0;
--
2.17.1