[dpdk-stable] patch 'test/hash: fix multiwriter with non consecutive cores' has been queued to stable release 18.05.1

[Christian Ehrhardt]

Hi,

FYI, your patch has been queued to stable release 18.05.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/01/18. So please
shout if anyone has objections.

Thanks.

Christian Ehrhardt <christian.ehrhardt at canonical.com>

---
>From 43a27800c2f0dca23221801810b382208fe6ad5d Mon Sep 17 00:00:00 2001
From: Pablo de Lara <pablo.de.lara.guarch at intel.com>
Date: Tue, 17 Jul 2018 14:31:50 +0100
Subject: [PATCH] test/hash: fix multiwriter with non consecutive cores

[ upstream commit 0c992822901464d440534d337838fd08acf233d4 ]

When non consecutive cores are passed into the test application,
the distribution of the keys that each thread needs to insert
is not correct, since it assumes that there are no cores skipped
between the master core and the worker core.

Fixes: be856325cba3 ("hash: add scalable multi-writer insertion with Intel TSX")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
---
 test/test/test_hash_multiwriter.c | 41 +++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/test/test/test_hash_multiwriter.c b/test/test/test_hash_multiwriter.c
index ef5fce3d2..b9144a0da 100644
--- a/test/test/test_hash_multiwriter.c
+++ b/test/test/test_hash_multiwriter.c
@@ -48,18 +48,29 @@ static rte_atomic64_t ginsertions;
 static int use_htm;
 
 static int
-test_hash_multiwriter_worker(__attribute__((unused)) void *arg)
+test_hash_multiwriter_worker(void *arg)
 {
 	uint64_t i, offset;
+	uint16_t pos_core;
 	uint32_t lcore_id = rte_lcore_id();
 	uint64_t begin, cycles;
+	uint16_t *enabled_core_ids = (uint16_t *)arg;
 
-	offset = (lcore_id - rte_get_master_lcore())
-		* tbl_multiwriter_test_params.nb_tsx_insertion;
+	for (pos_core = 0; pos_core < rte_lcore_count(); pos_core++) {
+		if (enabled_core_ids[pos_core] == lcore_id)
+			break;
+	}
+
+	/*
+	 * Calculate offset for entries based on the position of the
+	 * logical core, from the master core (not counting not enabled cores)
+	 */
+	offset = pos_core * tbl_multiwriter_test_params.nb_tsx_insertion;
 
 	printf("Core #%d inserting %d: %'"PRId64" - %'"PRId64"\n",
 	       lcore_id, tbl_multiwriter_test_params.nb_tsx_insertion,
-	       offset, offset + tbl_multiwriter_test_params.nb_tsx_insertion);
+	       offset,
+	       offset + tbl_multiwriter_test_params.nb_tsx_insertion - 1);
 
 	begin = rte_rdtsc_precise();
 
@@ -88,6 +99,8 @@ test_hash_multiwriter(void)
 {
 	unsigned int i, rounded_nb_total_tsx_insertion;
 	static unsigned calledCount = 1;
+	uint16_t enabled_core_ids[RTE_MAX_LCORE];
+	uint16_t core_id;
 
 	uint32_t *keys;
 	uint32_t *found;
@@ -158,9 +171,27 @@ test_hash_multiwriter(void)
 	rte_atomic64_init(&ginsertions);
 	rte_atomic64_clear(&ginsertions);
 
+	/* Get list of enabled cores */
+	i = 0;
+	for (core_id = 0; core_id < RTE_MAX_LCORE; core_id++) {
+		if (i == rte_lcore_count())
+			break;
+
+		if (rte_lcore_is_enabled(core_id)) {
+			enabled_core_ids[i] = core_id;
+			i++;
+		}
+	}
+
+	if (i != rte_lcore_count()) {
+		printf("Number of enabled cores in list is different from "
+				"number given by rte_lcore_count()\n");
+		goto err3;
+	}
+
 	/* Fire all threads. */
 	rte_eal_mp_remote_launch(test_hash_multiwriter_worker,
-				 NULL, CALL_MASTER);
+				 enabled_core_ids, CALL_MASTER);
 	rte_eal_mp_wait_lcore();
 
 	while (rte_hash_iterate(handle, &next_key, &next_data, &iter) >= 0) {
-- 
2.17.1