perfmon: combined set and start command.

Original set, start, stop, reset, show etc interface was somewhat cumbersome, we
can improve slightly by combining set and start.

Type: improvement

Signed-off-by: Ray Kinsella <mdr@ashroe.eu>
Change-Id: I7b865b2c29d2ab32adbd24d7f8a580da6990bb76

3 files changed, 36 insertions, 47 deletions

diff --git a/src/plugins/perfmon/cli.c b/src/plugins/perfmon/cli.c
index 7ffa6e89c0a..39e0319603a 100644
--- a/src/plugins/perfmon/cli.c
+++ b/src/plugins/perfmon/cli.c
@@ -250,7 +250,6 @@ show_perfmon_active_bundle_command_fn (vlib_main_t *vm,
   perfmon_main_t *pm = &perfmon_main;
 
   vlib_cli_output (vm, "%U\n", format_perfmon_bundle, pm->active_bundle, 1);
-
   return 0;
 }
 
@@ -278,7 +277,7 @@ show_perfmon_stats_command_fn (vlib_main_t *vm, unformat_input_t *input,
   u8 raw = 0;
 
   if (b == 0)
-    return clib_error_return (0, "no budle selected");
+    return clib_error_return (0, "no bundle selected");
 
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
@@ -376,19 +375,37 @@ VLIB_CLI_COMMAND (show_perfmon_stats_command, static) = {
 };
 
 static clib_error_t *
-set_perfmon_bundle_command_fn (vlib_main_t *vm, unformat_input_t *input,
-			       vlib_cli_command_t *cmd)
+perfmon_reset_command_fn (vlib_main_t *vm, unformat_input_t *input,
+			  vlib_cli_command_t *cmd)
+{
+  perfmon_reset (vm);
+  return 0;
+}
+
+VLIB_CLI_COMMAND (perfmon_reset_command, static) = {
+  .path = "perfmon reset",
+  .short_help = "perfmon reset",
+  .function = perfmon_reset_command_fn,
+  .is_mp_safe = 1,
+};
+
+static clib_error_t *
+perfmon_start_command_fn (vlib_main_t *vm, unformat_input_t *input,
+			  vlib_cli_command_t *cmd)
 {
   perfmon_main_t *pm = &perfmon_main;
   unformat_input_t _line_input, *line_input = &_line_input;
   perfmon_bundle_t *b = 0;
 
+  if (pm->is_running)
+    return clib_error_return (0, "please stop first");
+
   if (unformat_user (input, unformat_line_input, line_input) == 0)
     return clib_error_return (0, "please specify bundle name");
 
   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
     {
-      if (unformat (line_input, "%U", unformat_perfmon_bundle_name, &b))
+      if (unformat (line_input, "bundle %U", unformat_perfmon_bundle_name, &b))
 	;
       else
 	return clib_error_return (0, "unknown input '%U'",
@@ -399,44 +416,12 @@ set_perfmon_bundle_command_fn (vlib_main_t *vm, unformat_input_t *input,
   if (b == 0)
     return clib_error_return (0, "please specify bundle name");
 
-  if (pm->is_running)
-    return clib_error_return (0, "please stop first");
-
-  return perfmon_set (vm, b);
-}
-
-VLIB_CLI_COMMAND (set_perfmon_bundle_command, static) = {
-  .path = "set perfmon bundle",
-  .short_help = "set perfmon bundle [<bundle-name>]",
-  .function = set_perfmon_bundle_command_fn,
-  .is_mp_safe = 1,
-};
-
-static clib_error_t *
-perfmon_reset_command_fn (vlib_main_t *vm, unformat_input_t *input,
-			  vlib_cli_command_t *cmd)
-{
-  perfmon_reset (vm);
-  return 0;
-}
-
-VLIB_CLI_COMMAND (perfmon_reset_command, static) = {
-  .path = "perfmon reset",
-  .short_help = "perfmon reset",
-  .function = perfmon_reset_command_fn,
-  .is_mp_safe = 1,
-};
-
-static clib_error_t *
-perfmon_start_command_fn (vlib_main_t *vm, unformat_input_t *input,
-			  vlib_cli_command_t *cmd)
-{
-  return perfmon_start (vm);
+  return perfmon_start (vm, b);
 }
 
 VLIB_CLI_COMMAND (perfmon_start_command, static) = {
   .path = "perfmon start",
-  .short_help = "perfmon start",
+  .short_help = "perfmon start bundle [<bundle-name>]",
   .function = perfmon_start_command_fn,
   .is_mp_safe = 1,
 };
diff --git a/src/plugins/perfmon/perfmon.c b/src/plugins/perfmon/perfmon.c
index 316e7a5d60a..f9402f8f8e9 100644
--- a/src/plugins/perfmon/perfmon.c
+++ b/src/plugins/perfmon/perfmon.c
@@ -79,7 +79,7 @@ perfmon_reset (vlib_main_t *vm)
   pm->active_bundle = 0;
 }
 
-clib_error_t *
+static clib_error_t *
 perfmon_set (vlib_main_t *vm, perfmon_bundle_t *b)
 {
   clib_error_t *err = 0;
@@ -212,17 +212,20 @@ error:
 }
 
 clib_error_t *
-perfmon_start (vlib_main_t *vm)
+perfmon_start (vlib_main_t *vm, perfmon_bundle_t *b)
 {
+  clib_error_t *err = 0;
   perfmon_main_t *pm = &perfmon_main;
-  int n_groups = vec_len (pm->group_fds);
-
-  if (n_groups == 0)
-    return clib_error_return (0, "no bundle configured");
+  int n_groups;
 
   if (pm->is_running == 1)
     return clib_error_return (0, "already running");
 
+  if ((err = perfmon_set (vm, b)) != 0)
+    return err;
+
+  n_groups = vec_len (pm->group_fds);
+
   for (int i = 0; i < n_groups; i++)
     {
       if (ioctl (pm->group_fds[i], PERF_EVENT_IOC_ENABLE,
@@ -238,8 +241,10 @@ perfmon_start (vlib_main_t *vm)
 	vlib_node_set_dispatch_wrapper (vlib_get_main_by_index (i),
 					perfmon_dispatch_wrapper);
     }
+
   pm->sample_time = vlib_time_now (vm);
   pm->is_running = 1;
+
   return 0;
 }
 
diff --git a/src/plugins/perfmon/perfmon.h b/src/plugins/perfmon/perfmon.h
index c8b8cc47716..f24a23bd974 100644
--- a/src/plugins/perfmon/perfmon.h
+++ b/src/plugins/perfmon/perfmon.h
@@ -164,8 +164,7 @@ extern perfmon_main_t perfmon_main;
   perfmon_bundle_t __perfmon_bundle_##x
 
 void perfmon_reset (vlib_main_t *vm);
-clib_error_t *perfmon_set (vlib_main_t *vm, perfmon_bundle_t *);
-clib_error_t *perfmon_start (vlib_main_t *vm);
+clib_error_t *perfmon_start (vlib_main_t *vm, perfmon_bundle_t *);
 clib_error_t *perfmon_stop (vlib_main_t *vm);
 
 #define PERFMON_STRINGS(...)                                                  \