[PATCH 05/10] app/dma-perf: support list DMA devices

[Chengwen Feng]

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 <fengcheng...@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 7c121208dd..da9ae0a1bb 100644
--- a/app/test-dma-perf/main.c
+++ b/app/test-dma-perf/main.c
@@ -43,6 +43,7 @@ static struct global_configure global_cfg;
 
 static char *config_path;
 static char *result_path;
+static bool  list_dma;
 
 __rte_format_printf(1, 2)
 void
@@ -527,6 +528,10 @@ 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(),
                },
        };
@@ -567,6 +572,45 @@ 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[])
 {
@@ -580,6 +624,11 @@ 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