[PATCH v4 1/2] app/dma-perf: validate copied memory

[Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>]

Validate copied memory to ensure DMA copy did not fail.

Fixes: 623dc9364dc ("app/dma-perf: introduce DMA performance test")

Signed-off-by: Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>
---
 app/test-dma-perf/benchmark.c | 24 ++++++++++++++++++++++--
 app/test-dma-perf/main.c      | 16 +++++++++++-----
 app/test-dma-perf/main.h      |  2 +-
 3 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/app/test-dma-perf/benchmark.c b/app/test-dma-perf/benchmark.c
index 0601e0d171..99e05436b9 100644
--- a/app/test-dma-perf/benchmark.c
+++ b/app/test-dma-perf/benchmark.c
@@ -12,6 +12,7 @@
 #include <rte_dmadev.h>
 #include <rte_malloc.h>
 #include <rte_lcore.h>
+#include <rte_random.h>
 
 #include "main.h"
 
@@ -308,6 +309,7 @@ setup_memory_env(struct test_configure *cfg, struct rte_mbuf ***srcs,
 	unsigned int buf_size = cfg->buf_size.cur;
 	unsigned int nr_sockets;
 	uint32_t nr_buf = cfg->nr_buf;
+	uint32_t i;
 
 	nr_sockets = rte_socket_count();
 	if (cfg->src_numa_node >= nr_sockets ||
@@ -360,13 +362,18 @@ setup_memory_env(struct test_configure *cfg, struct rte_mbuf ***srcs,
 		return -1;
 	}
 
+	for (i = 0; i < nr_buf; i++) {
+		memset(rte_pktmbuf_mtod((*srcs)[i], void *), rte_rand(), buf_size);
+		memset(rte_pktmbuf_mtod((*dsts)[i], void *), 0, buf_size);
+	}
+
 	return 0;
 }
 
-void
+int
 mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
 {
-	uint16_t i;
+	uint32_t i;
 	uint32_t offset;
 	unsigned int lcore_id = 0;
 	struct rte_mbuf **srcs = NULL, **dsts = NULL;
@@ -381,6 +388,7 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
 	uint32_t avg_cycles_total;
 	float mops, mops_total;
 	float bandwidth, bandwidth_total;
+	int ret = 0;
 
 	if (setup_memory_env(cfg, &srcs, &dsts) < 0)
 		goto out;
@@ -454,6 +462,16 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
 
 	rte_eal_mp_wait_lcore();
 
+	for (i = 0; i < (nr_buf / nb_workers) * nb_workers; i++) {
+		if (memcmp(rte_pktmbuf_mtod(srcs[i], void *),
+			   rte_pktmbuf_mtod(dsts[i], void *),
+			   cfg->buf_size.cur) != 0) {
+			printf("Copy validation fails for buffer number %d\n", i);
+			ret = -1;
+			goto out;
+		}
+	}
+
 	mops_total = 0;
 	bandwidth_total = 0;
 	avg_cycles_total = 0;
@@ -505,4 +523,6 @@ mem_copy_benchmark(struct test_configure *cfg, bool is_dma)
 			rte_dma_stop(ldm->dma_ids[i]);
 		}
 	}
+
+	return ret;
 }
diff --git a/app/test-dma-perf/main.c b/app/test-dma-perf/main.c
index e5bccc27da..f917be4216 100644
--- a/app/test-dma-perf/main.c
+++ b/app/test-dma-perf/main.c
@@ -86,20 +86,24 @@ output_header(uint32_t case_id, struct test_configure *case_cfg)
 	output_csv(true);
 }
 
-static void
+static int
 run_test_case(struct test_configure *case_cfg)
 {
+	int ret = 0;
+
 	switch (case_cfg->test_type) {
 	case TEST_TYPE_DMA_MEM_COPY:
-		mem_copy_benchmark(case_cfg, true);
+		ret = mem_copy_benchmark(case_cfg, true);
 		break;
 	case TEST_TYPE_CPU_MEM_COPY:
-		mem_copy_benchmark(case_cfg, false);
+		ret = mem_copy_benchmark(case_cfg, false);
 		break;
 	default:
 		printf("Unknown test type. %s\n", case_cfg->test_type_str);
 		break;
 	}
+
+	return ret;
 }
 
 static void
@@ -144,8 +148,10 @@ run_test(uint32_t case_id, struct test_configure *case_cfg)
 		case_cfg->scenario_id++;
 		printf("\nRunning scenario %d\n", case_cfg->scenario_id);
 
-		run_test_case(case_cfg);
-		output_csv(false);
+		if (run_test_case(case_cfg) < 0)
+			printf("\nTest fails! skipping this scenario.\n");
+		else
+			output_csv(false);
 
 		if (var_entry->op == OP_ADD)
 			var_entry->cur += var_entry->incr;
diff --git a/app/test-dma-perf/main.h b/app/test-dma-perf/main.h
index f65e264378..658f22f673 100644
--- a/app/test-dma-perf/main.h
+++ b/app/test-dma-perf/main.h
@@ -59,6 +59,6 @@ struct test_configure {
 	uint8_t scenario_id;
 };
 
-void mem_copy_benchmark(struct test_configure *cfg, bool is_dma);
+int mem_copy_benchmark(struct test_configure *cfg, bool is_dma);
 
 #endif /* MAIN_H */
-- 
2.25.1