[dpdk-dev] [PATCH v2 1/2] test/hash: use existing lcore API

[David Marchand <david.marchand@redhat.com>]

Prefer the existing apis rather than direct access the configuration
structure.

test_hash_multi_add_lookup() currently starts n readers and N writers
using rte_eal_remote_launch().
It then waits for the N writers to complete with a custom
multi_writer_done[] array to synchronise over.
Jump on the occasion to use rte_eal_wait_lcore() so that the code is
more straightforward:
- we start n readers with rte_eal_remote_launch(),
- we start N writers with rte_eal_remote_launch(),
- we wait for N writers to join with rte_eal_wait_lcore(),
- we wait for n readers to join with rte_eal_wait_lcore(),

Fixes: c7eb0972e74b ("test/hash: add lock-free r/w concurrency")
Fixes: 3f9aab961ed3 ("test/hash: check lock-free extendable bucket")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 app/test/test_hash_readwrite_lf.c | 41 ++++++++++++++++++---------------------
 1 file changed, 19 insertions(+), 22 deletions(-)

---
Changelog since v1:
- fixed test hang in test_hash_multi_add_lookup() reported by Wang, Yipeng

diff --git a/app/test/test_hash_readwrite_lf.c b/app/test/test_hash_readwrite_lf.c
index 4ab4c8e..343a338 100644
--- a/app/test/test_hash_readwrite_lf.c
+++ b/app/test/test_hash_readwrite_lf.c
@@ -86,7 +86,6 @@ struct {
 static rte_atomic64_t greads;
 
 static volatile uint8_t writer_done;
-static volatile uint8_t multi_writer_done[4];
 
 uint16_t enabled_core_ids[RTE_MAX_LCORE];
 
@@ -690,7 +689,6 @@ struct {
 	for (i = offset; i < offset + tbl_rwc_test_param.single_insert; i++)
 		rte_hash_add_key(tbl_rwc_test_param.h,
 				 tbl_rwc_test_param.keys_ks + i);
-	multi_writer_done[pos_core] = 1;
 	return 0;
 }
 
@@ -738,10 +736,9 @@ struct {
 				rte_eal_remote_launch(test_rwc_reader,
 						(void *)(uintptr_t)read_type,
 							enabled_core_ids[i]);
-			rte_eal_mp_wait_lcore();
 
 			for (i = 1; i <= rwc_core_cnt[n]; i++)
-				if (lcore_config[i].ret < 0)
+				if (rte_eal_wait_lcore(i) < 0)
 					goto err;
 
 			unsigned long long cycles_per_lookup =
@@ -758,6 +755,7 @@ struct {
 	return 0;
 
 err:
+	rte_eal_mp_wait_lcore();
 	rte_hash_free(tbl_rwc_test_param.h);
 	return -1;
 }
@@ -808,12 +806,11 @@ struct {
 							enabled_core_ids[i]);
 			ret = write_keys(write_type);
 			writer_done = 1;
-			rte_eal_mp_wait_lcore();
 
 			if (ret < 0)
 				goto err;
 			for (i = 1; i <= rwc_core_cnt[n]; i++)
-				if (lcore_config[i].ret < 0)
+				if (rte_eal_wait_lcore(i) < 0)
 					goto err;
 
 			unsigned long long cycles_per_lookup =
@@ -830,6 +827,7 @@ struct {
 	return 0;
 
 err:
+	rte_eal_mp_wait_lcore();
 	rte_hash_free(tbl_rwc_test_param.h);
 	return -1;
 }
@@ -884,12 +882,11 @@ struct {
 			write_type = WRITE_KEY_SHIFT;
 			ret = write_keys(write_type);
 			writer_done = 1;
-			rte_eal_mp_wait_lcore();
 
 			if (ret < 0)
 				goto err;
 			for (i = 1; i <= rwc_core_cnt[n]; i++)
-				if (lcore_config[i].ret < 0)
+				if (rte_eal_wait_lcore(i) < 0)
 					goto err;
 
 			unsigned long long cycles_per_lookup =
@@ -906,6 +903,7 @@ struct {
 	return 0;
 
 err:
+	rte_eal_mp_wait_lcore();
 	rte_hash_free(tbl_rwc_test_param.h);
 	return -1;
 }
@@ -960,12 +958,11 @@ struct {
 			write_type = WRITE_KEY_SHIFT;
 			ret = write_keys(write_type);
 			writer_done = 1;
-			rte_eal_mp_wait_lcore();
 
 			if (ret < 0)
 				goto err;
 			for (i = 1; i <= rwc_core_cnt[n]; i++)
-				if (lcore_config[i].ret < 0)
+				if (rte_eal_wait_lcore(i) < 0)
 					goto err;
 
 			unsigned long long cycles_per_lookup =
@@ -982,6 +979,7 @@ struct {
 	return 0;
 
 err:
+	rte_eal_mp_wait_lcore();
 	rte_hash_free(tbl_rwc_test_param.h);
 	return -1;
 }
@@ -1035,12 +1033,11 @@ struct {
 			write_type = WRITE_KEY_SHIFT;
 			ret = write_keys(write_type);
 			writer_done = 1;
-			rte_eal_mp_wait_lcore();
 
 			if (ret < 0)
 				goto err;
 			for (i = 1; i <= rwc_core_cnt[n]; i++)
-				if (lcore_config[i].ret < 0)
+				if (rte_eal_wait_lcore(i) < 0)
 					goto err;
 
 			unsigned long long cycles_per_lookup =
@@ -1056,6 +1053,7 @@ struct {
 	return 0;
 
 err:
+	rte_eal_mp_wait_lcore();
 	rte_hash_free(tbl_rwc_test_param.h);
 	return -1;
 }
@@ -1108,8 +1106,6 @@ struct {
 
 				rte_hash_reset(tbl_rwc_test_param.h);
 				writer_done = 0;
-				for (i = 0; i < 4; i++)
-					multi_writer_done[i] = 0;
 				write_type = WRITE_NO_KEY_SHIFT;
 				if (write_keys(write_type) < 0)
 					goto err;
@@ -1133,15 +1129,15 @@ struct {
 				}
 
 				/* Wait for writers to complete */
-				for (i = 0; i < rwc_core_cnt[m]; i++)
-					while
-						(multi_writer_done[i] == 0);
-				writer_done = 1;
+				for (i = rwc_core_cnt[n] + 1;
+				     i <= rwc_core_cnt[m] + rwc_core_cnt[n];
+				     i++)
+					rte_eal_wait_lcore(i);
 
-				rte_eal_mp_wait_lcore();
+				writer_done = 1;
 
 				for (i = 1; i <= rwc_core_cnt[n]; i++)
-					if (lcore_config[i].ret < 0)
+					if (rte_eal_wait_lcore(i) < 0)
 						goto err;
 
 				unsigned long long cycles_per_lookup =
@@ -1160,6 +1156,7 @@ struct {
 	return 0;
 
 err:
+	rte_eal_mp_wait_lcore();
 	rte_hash_free(tbl_rwc_test_param.h);
 	return -1;
 }
@@ -1222,10 +1219,9 @@ struct {
 				}
 			}
 			writer_done = 1;
-			rte_eal_mp_wait_lcore();
 
 			for (i = 1; i <= rwc_core_cnt[n]; i++)
-				if (lcore_config[i].ret < 0)
+				if (rte_eal_wait_lcore(i) < 0)
 					goto err;
 
 			unsigned long long cycles_per_lookup =
@@ -1242,6 +1238,7 @@ struct {
 	return 0;
 
 err:
+	rte_eal_mp_wait_lcore();
 	rte_hash_free(tbl_rwc_test_param.h);
 	return -1;
 }
-- 
1.8.3.1