Re: [dpdk-dev] [PATCH v1 06/12] test/func_reentrancy: use compiler atomic for data sync

[Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>]

<snip>

> 
> Convert rte_atomic usages to compiler atomic built-ins for data sync in
> func_reentrancy test cases.
> 
> Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Looks good.
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

> ---
>  app/test/test_func_reentrancy.c | 27 +++++++++++++--------------
>  1 file changed, 13 insertions(+), 14 deletions(-)
> 
> diff --git a/app/test/test_func_reentrancy.c b/app/test/test_func_reentrancy.c
> index 231c99a9eb..c00ecb8110 100644
> --- a/app/test/test_func_reentrancy.c
> +++ b/app/test/test_func_reentrancy.c
> @@ -20,7 +20,6 @@
>  #include <rte_eal.h>
>  #include <rte_per_lcore.h>
>  #include <rte_lcore.h>
> -#include <rte_atomic.h>
>  #include <rte_branch_prediction.h>
>  #include <rte_ring.h>
>  #include <rte_mempool.h>
> @@ -54,12 +53,12 @@ typedef void (*case_clean_t)(unsigned lcore_id);
> 
>  #define MAX_LCORES	(RTE_MAX_MEMZONE / (MAX_ITER_MULTI * 4U))
> 
> -static rte_atomic32_t obj_count = RTE_ATOMIC32_INIT(0); -static
> rte_atomic32_t synchro = RTE_ATOMIC32_INIT(0);
> +static uint32_t obj_count;
> +static uint32_t synchro;
> 
>  #define WAIT_SYNCHRO_FOR_WORKERS()   do { \
>  	if (lcore_self != rte_get_main_lcore())                  \
> -		while (rte_atomic32_read(&synchro) == 0);        \
> +		rte_wait_until_equal_32(&synchro, 1, __ATOMIC_RELAXED); \
>  } while(0)
> 
>  /*
> @@ -72,7 +71,7 @@ test_eal_init_once(__rte_unused void *arg)
> 
>  	WAIT_SYNCHRO_FOR_WORKERS();
> 
> -	rte_atomic32_set(&obj_count, 1); /* silent the check in the caller */
> +	__atomic_store_n(&obj_count, 1, __ATOMIC_RELAXED); /* silent the
> check
> +in the caller */
>  	if (rte_eal_init(0, NULL) != -1)
>  		return -1;
> 
> @@ -112,7 +111,7 @@ ring_create_lookup(__rte_unused void *arg)
>  	for (i = 0; i < MAX_ITER_ONCE; i++) {
>  		rp = rte_ring_create("fr_test_once", 4096, SOCKET_ID_ANY,
> 0);
>  		if (rp != NULL)
> -			rte_atomic32_inc(&obj_count);
> +			__atomic_fetch_add(&obj_count, 1,
> __ATOMIC_RELAXED);
>  	}
> 
>  	/* create/lookup new ring several times */ @@ -176,7 +175,7 @@
> mempool_create_lookup(__rte_unused void *arg)
>  					my_obj_init, NULL,
>  					SOCKET_ID_ANY, 0);
>  		if (mp != NULL)
> -			rte_atomic32_inc(&obj_count);
> +			__atomic_fetch_add(&obj_count, 1,
> __ATOMIC_RELAXED);
>  	}
> 
>  	/* create/lookup new ring several times */ @@ -239,7 +238,7 @@
> hash_create_free(__rte_unused void *arg)
>  	for (i = 0; i < MAX_ITER_ONCE; i++) {
>  		handle = rte_hash_create(&hash_params);
>  		if (handle != NULL)
> -			rte_atomic32_inc(&obj_count);
> +			__atomic_fetch_add(&obj_count, 1,
> __ATOMIC_RELAXED);
>  	}
> 
>  	/* create mutiple times simultaneously */ @@ -303,7 +302,7 @@
> fbk_create_free(__rte_unused void *arg)
>  	for (i = 0; i < MAX_ITER_ONCE; i++) {
>  		handle = rte_fbk_hash_create(&fbk_params);
>  		if (handle != NULL)
> -			rte_atomic32_inc(&obj_count);
> +			__atomic_fetch_add(&obj_count, 1,
> __ATOMIC_RELAXED);
>  	}
> 
>  	/* create mutiple fbk tables simultaneously */ @@ -365,7 +364,7 @@
> lpm_create_free(__rte_unused void *arg)
>  	for (i = 0; i < MAX_ITER_ONCE; i++) {
>  		lpm = rte_lpm_create("fr_test_once",  SOCKET_ID_ANY,
> &config);
>  		if (lpm != NULL)
> -			rte_atomic32_inc(&obj_count);
> +			__atomic_fetch_add(&obj_count, 1,
> __ATOMIC_RELAXED);
>  	}
> 
>  	/* create mutiple fbk tables simultaneously */ @@ -427,8 +426,8 @@
> launch_test(struct test_case *pt_case)
>  	if (pt_case->func == NULL)
>  		return -1;
> 
> -	rte_atomic32_set(&obj_count, 0);
> -	rte_atomic32_set(&synchro, 0);
> +	__atomic_store_n(&obj_count, 0, __ATOMIC_RELAXED);
> +	__atomic_store_n(&synchro, 0, __ATOMIC_RELAXED);
> 
>  	RTE_LCORE_FOREACH_WORKER(lcore_id) {
>  		if (cores == 1)
> @@ -437,7 +436,7 @@ launch_test(struct test_case *pt_case)
>  		rte_eal_remote_launch(pt_case->func, pt_case->arg,
> lcore_id);
>  	}
> 
> -	rte_atomic32_set(&synchro, 1);
> +	__atomic_store_n(&synchro, 1, __ATOMIC_RELAXED);
> 
>  	if (pt_case->func(pt_case->arg) < 0)
>  		ret = -1;
> @@ -454,7 +453,7 @@ launch_test(struct test_case *pt_case)
>  			pt_case->clean(lcore_id);
>  	}
> 
> -	count = rte_atomic32_read(&obj_count);
> +	count = __atomic_load_n(&obj_count, __ATOMIC_RELAXED);
>  	if (count != 1) {
>  		printf("%s: common object allocated %d times (should be
> 1)\n",
>  			pt_case->name, count);
> --
> 2.17.1