[dpdk-dev] [PATCH v2 23/32] eal/trace: add trace dir configuration parameter

[<jerinj@marvell.com>]

From: Sunil Kumar Kori <skori@marvell.com>

Trace library exposes --trace-dir EAL parameter to configure
directory where traces will be generated.

Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
---
 doc/guides/linux_gsg/eal_args.include.rst     | 11 ++++
 lib/librte_eal/common/eal_common_options.c    | 15 ++++++
 .../common/eal_common_trace_utils.c           | 54 +++++++++++++++++++
 lib/librte_eal/common/eal_options.h           |  2 +
 lib/librte_eal/common/eal_trace.h             |  1 +
 5 files changed, 83 insertions(+)

diff --git a/doc/guides/linux_gsg/eal_args.include.rst b/doc/guides/linux_gsg/eal_args.include.rst
index 94289d1e2..8c72363b4 100644
--- a/doc/guides/linux_gsg/eal_args.include.rst
+++ b/doc/guides/linux_gsg/eal_args.include.rst
@@ -155,6 +155,17 @@ Debugging options
 
     Can be specified multiple times up to 32 times.
 
+*   ``--trace-dir=<directory path>``
+
+    Specify trace directory for trace output. For example:
+
+    Configuring ``/tmp/`` as a trace output directory::
+
+        --trace-dir=/tmp
+
+    By default, trace output will created at ``home`` directory and parameter
+    must be specified once only.
+
 Other options
 ~~~~~~~~~~~~~
 
diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 0d6576a12..d71f89be2 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -69,6 +69,7 @@ eal_long_options[] = {
 	{OPT_LCORES,            1, NULL, OPT_LCORES_NUM           },
 	{OPT_LOG_LEVEL,         1, NULL, OPT_LOG_LEVEL_NUM        },
 	{OPT_TRACE_LEVEL,       1, NULL, OPT_TRACE_LEVEL_NUM      },
+	{OPT_TRACE_DIR,         1, NULL, OPT_TRACE_DIR_NUM        },
 	{OPT_MASTER_LCORE,      1, NULL, OPT_MASTER_LCORE_NUM     },
 	{OPT_MBUF_POOL_OPS_NAME, 1, NULL, OPT_MBUF_POOL_OPS_NAME_NUM},
 	{OPT_NO_HPET,           0, NULL, OPT_NO_HPET_NUM          },
@@ -1430,6 +1431,15 @@ eal_parse_common_option(int opt, const char *optarg,
 		break;
 	}
 
+	case OPT_TRACE_DIR_NUM: {
+		if (eal_trace_dir_args_save(optarg) < 0) {
+			RTE_LOG(ERR, EAL, "invalid parameters for --"
+				OPT_TRACE_DIR "\n");
+			return -1;
+		}
+		break;
+	}
+
 	case OPT_LCORES_NUM:
 		if (eal_parse_lcores(optarg) < 0) {
 			RTE_LOG(ERR, EAL, "invalid parameter for --"
@@ -1710,6 +1720,11 @@ eal_common_usage(void)
 	       "                    Set trace level specific to component\n"
 	       "                    Default, there is no trace level enabled\n"
 	       "                    User must specify this option if required\n"
+	       "  --"OPT_TRACE_DIR"=<directory path>\n"
+	       "                    Specify trace directory for trace output.\n"
+	       "                    By default, trace output will created at\n"
+	       "                    HOME directory and parameter must be\n"
+	       "                    specified once only\n"
 	       "  -v                  Display version information on startup\n"
 	       "  -h, --help          This help\n"
 	       "  --"OPT_IN_MEMORY"   Operate entirely in memory. This will\n"
diff --git a/lib/librte_eal/common/eal_common_trace_utils.c b/lib/librte_eal/common/eal_common_trace_utils.c
index 1f47faed4..3c85152c7 100644
--- a/lib/librte_eal/common/eal_common_trace_utils.c
+++ b/lib/librte_eal/common/eal_common_trace_utils.c
@@ -118,6 +118,22 @@ trace_session_name_generate(char *trace_dir)
 	return -rte_errno;
 }
 
+static int
+trace_dir_update(const char *str)
+{
+	struct trace *trace = trace_obj_get();
+	int rc, remaining;
+
+	remaining = sizeof(trace->dir) - trace->dir_offset;
+	rc = rte_strscpy(&trace->dir[0] + trace->dir_offset, str, remaining);
+	if (rc < 0)
+		goto fail;
+
+	trace->dir_offset += rc;
+fail:
+	return rc;
+}
+
 int
 eal_trace_level_args_save(const char *optarg)
 {
@@ -222,6 +238,37 @@ trace_level_args_apply(const char *arg)
 	return -1;
 }
 
+int
+eal_trace_dir_args_save(char const *optarg)
+{
+	struct trace *trace = trace_obj_get();
+	uint32_t size = sizeof(trace->dir);
+	char *dir_path = NULL;
+	int rc;
+
+	if (optarg == NULL) {
+		trace_err("no optarg is passed\n");
+		return -EINVAL;
+	}
+
+	if (strlen(optarg) >= size) {
+		trace_err("input string is too big\n");
+		return -ENAMETOOLONG;
+	}
+
+	dir_path = (char *)calloc(1, size);
+	if (dir_path == NULL) {
+		trace_err("fail to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	sprintf(dir_path, "%s/", optarg);
+	rc = trace_dir_update(dir_path);
+
+	free(dir_path);
+	return rc;
+}
+
 int
 trace_epoch_time_save(void)
 {
@@ -292,6 +339,10 @@ trace_mkdir(void)
 			return rc;
 		}
 
+		rc = trace_dir_update(dir_path);
+		free(dir_path);
+		if (rc < 0)
+			return rc;
 	}
 
 	/* Create the path if it t exist, no "mkdir -p" available here */
@@ -303,6 +354,9 @@ trace_mkdir(void)
 	}
 
 	rc = trace_session_name_generate(session);
+	if (rc < 0)
+		return rc;
+	rc = trace_dir_update(session);
 	if (rc < 0)
 		return rc;
 
diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h
index c274a30cc..8c8283165 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -35,6 +35,8 @@ enum {
 	OPT_LOG_LEVEL_NUM,
 #define OPT_TRACE_LEVEL       "trace-level"
 	OPT_TRACE_LEVEL_NUM,
+#define OPT_TRACE_DIR         "trace-dir"
+	OPT_TRACE_DIR_NUM,
 #define OPT_MASTER_LCORE      "master-lcore"
 	OPT_MASTER_LCORE_NUM,
 #define OPT_MBUF_POOL_OPS_NAME "mbuf-pool-ops-name"
diff --git a/lib/librte_eal/common/eal_trace.h b/lib/librte_eal/common/eal_trace.h
index acdc8ecab..9ff172cc0 100644
--- a/lib/librte_eal/common/eal_trace.h
+++ b/lib/librte_eal/common/eal_trace.h
@@ -114,5 +114,6 @@ int eal_trace_init(void);
 void eal_trace_fini(void);
 int eal_trace_level_args_save(const char *optarg);
 void eal_trace_level_args_free(void);
+int eal_trace_dir_args_save(const char *optarg);
 
 #endif /* __EAL_TRACE_H */
-- 
2.25.1