[PATCH 5/9] app/dma-perf: support list DMA devices

[Chengwen Feng <fengchengwen@huawei.com>]

Because the names of dmadevs are different, this commit support list
DMA devices, so that user could quickly know how to set the lcore_dma
parameters.

The command: dpdk-test-dma-perf --config ./config.ini --list-dma
The output like:
	DMA device: 0000:7b:00.0-ch0
	    transfer-capa: mem2mem
	    max-segs: 0 numa-node: 0

	DMA device: 0000:7b:00.0-ch1
	    transfer-capa: mem2mem
	    max-segs: 0 numa-node: 0

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 app/test-dma-perf/main.c | 49 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/app/test-dma-perf/main.c b/app/test-dma-perf/main.c
index 9b0b3a4103..7525ab3622 100644
--- a/app/test-dma-perf/main.c
+++ b/app/test-dma-perf/main.c
@@ -48,6 +48,7 @@ static struct global_configure global_cfg;
 
 static char *config_path;
 static char *result_path;
+static bool  list_dma;
 
 void
 output_csv(const char *fmt, ...)
@@ -531,6 +532,10 @@ parse_args(int argc, char **argv)
 			  (void *)&result_path, NULL,
 			  RTE_ARGPARSE_VALUE_REQUIRED, RTE_ARGPARSE_VALUE_TYPE_STR,
 			},
+			{ "--list-dma", NULL, "Optional, list dma devices and exit",
+			  (void *)&list_dma, (void *)true,
+			  RTE_ARGPARSE_VALUE_NONE, RTE_ARGPARSE_VALUE_TYPE_BOOL,
+			},
 			ARGPARSE_ARG_END(),
 		},
 	};
@@ -571,6 +576,45 @@ parse_args(int argc, char **argv)
 	return 0;
 }
 
+static void
+list_dma_dev(void)
+{
+	static const struct {
+		uint64_t capability;
+		const char *name;
+	} capa_names[] = {
+		{ RTE_DMA_CAPA_MEM_TO_MEM,  "mem2mem" },
+		{ RTE_DMA_CAPA_MEM_TO_DEV,  "mem2dev" },
+		{ RTE_DMA_CAPA_DEV_TO_MEM,  "dev2mem" },
+		{ RTE_DMA_CAPA_DEV_TO_DEV,  "dev2dev" },
+	};
+	struct rte_dma_info info;
+	int idx = 0;
+	uint32_t i;
+	int ret;
+
+	ret = rte_eal_init(global_cfg.eal_argc, global_cfg.eal_argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
+
+	RTE_DMA_FOREACH_DEV(idx) {
+		ret = rte_dma_info_get(idx, &info);
+		if (ret != 0)
+			continue;
+
+		printf("\nDMA device name: %s\n", info.dev_name);
+		printf("    transfer-capa:");
+		for (i = 0; i < RTE_DIM(capa_names); i++) {
+			if (capa_names[i].capability & info.dev_capa)
+				printf(" %s", capa_names[i].name);
+		}
+		printf("\n");
+		printf("    max-segs: %u numa-node: %d\n", info.max_sges, info.numa_node);
+	}
+
+	rte_eal_cleanup();
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -584,6 +628,11 @@ main(int argc, char *argv[])
 
 	case_nb = load_configs(config_path);
 
+	if (list_dma) {
+		list_dma_dev();
+		return 0;
+	}
+
 	printf("Running cases...\n");
 	for (i = 0; i < case_nb; i++) {
 		if (test_cases[i].is_skip) {
-- 
2.17.1