src/vlib/unix/cj.c - fdio/vpp - Gitiles

 /*
  *------------------------------------------------------------------
  * cj.c
  *
  * Copyright (c) 2013 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *------------------------------------------------------------------
  */

 /**
  * @file
  * Circular joournal diagnostic mechanism.
  *
  * The @c cj thread-safe circular log buffer scheme is occasionally useful
  * when chasing bugs. Calls to it should not be checked in.
  */
 /*? %%clicmd:group_label Circular Journal %% ?*/
 /*? %%syscfg:group_label Circular Journal %% ?*/

 #include <stdio.h>
 #include <vlib/vlib.h>

 #include <vlib/unix/cj.h>

 cj_main_t cj_main;

 void
 cj_log (u32 type, void *data0, void *data1)
 {
   u64 new_tail;
   cj_main_t *cjm = &cj_main;
   cj_record_t *r;

   if (cjm->enable == 0)
     return;

   new_tail = __sync_add_and_fetch (&cjm->tail, 1);

   r = (cj_record_t *) & (cjm->records[new_tail & (cjm->num_records - 1)]);
   r->time = vlib_time_now (cjm->vlib_main);
   r->thread_index = vlib_get_thread_index ();
   r->type = type;
   r->data[0] = pointer_to_uword (data0);
   r->data[1] = pointer_to_uword (data1);
 }

 void
 cj_stop (void)
 {
   cj_main_t *cjm = &cj_main;

   cjm->enable = 0;
 }


 clib_error_t *
 cj_init (vlib_main_t * vm)
 {
   cj_main_t *cjm = &cj_main;

   cjm->vlib_main = vm;
   return 0;
 }

 VLIB_INIT_FUNCTION (cj_init);

 static clib_error_t *
 cj_config (vlib_main_t * vm, unformat_input_t * input)
 {
   cj_main_t *cjm = &cj_main;
   int matched = 0;
   int enable = 0;

   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
       if (unformat (input, "records %d", &cjm->num_records))
 	matched = 1;
       else if (unformat (input, "on"))
 	enable = 1;
       else
 	return clib_error_return (0, "cj_config: unknown input '%U'",
 				  format_unformat_error, input);
     }

   if (matched == 0)
     return 0;

   cjm->num_records = max_pow2 (cjm->num_records);
   vec_validate (cjm->records, cjm->num_records - 1);
   memset (cjm->records, 0xff, cjm->num_records * sizeof (cj_record_t));
   cjm->tail = ~0;
   cjm->enable = enable;

   return 0;
 }

 /*?
  * Configure the circular journal diagnostic mechanism. This is only useful
  * if you, the deveoper, have written code to make use of the circular
  * journal.
  *
  * @cfgcmd{records, &lt;number&gt;}
  * Configure the number of records to allocate for the circular journal.
  *
  * @cfgcmd{on}
  * Enable the collection of records in the circular journal at the
  * earliest opportunity.
 ?*/
 VLIB_CONFIG_FUNCTION (cj_config, "cj");

 void
 cj_enable_disable (int is_enable)
 {
   cj_main_t *cjm = &cj_main;

   if (cjm->num_records)
     cjm->enable = is_enable;
   else
     vlib_cli_output (cjm->vlib_main, "CJ not configured...");
 }

 static inline void
 cj_dump_one_record (cj_record_t * r)
 {
   fprintf (stderr, "[%d]: %10.6f T%02d %llx %llx\n",
 	   r->thread_index, r->time, r->type,
 	   (long long unsigned int) r->data[0],
 	   (long long unsigned int) r->data[1]);
 }

 static void
 cj_dump_internal (u8 filter0_enable, u64 filter0,
 		  u8 filter1_enable, u64 filter1)
 {
   cj_main_t *cjm = &cj_main;
   cj_record_t *r;
   u32 i, index;

   if (cjm->num_records == 0)
     {
       fprintf (stderr, "CJ not configured...\n");
       return;
     }

   if (cjm->tail == (u64) ~ 0)
     {
       fprintf (stderr, "No data collected...\n");
       return;
     }

   /* Has the trace wrapped? */
   index = (cjm->tail + 1) & (cjm->num_records - 1);
   r = &(cjm->records[index]);

   if (r->thread_index != (u32) ~ 0)
     {
       /* Yes, dump from tail + 1 to the end */
       for (i = index; i < cjm->num_records; i++)
 	{
 	  if (filter0_enable && (r->data[0] != filter0))
 	    goto skip;
 	  if (filter1_enable && (r->data[1] != filter1))
 	    goto skip;
 	  cj_dump_one_record (r);
 	skip:
 	  r++;
 	}
     }
   /* dump from the beginning through the final tail */
   r = cjm->records;
   for (i = 0; i <= cjm->tail; i++)
     {
       if (filter0_enable && (r->data[0] != filter0))
 	goto skip2;
       if (filter1_enable && (r->data[1] != filter1))
 	goto skip2;
       cj_dump_one_record (r);
     skip2:
       r++;
     }
 }

 void
 cj_dump (void)
 {
   cj_dump_internal (0, 0, 0, 0);
 }

 void
 cj_dump_filter_data0 (u64 filter0)
 {
   cj_dump_internal (1 /* enable f0 */ , filter0, 0, 0);
 }

 void
 cj_dump_filter_data1 (u64 filter1)
 {
   cj_dump_internal (0, 0, 1 /* enable f1 */ , filter1);
 }

 void
 cj_dump_filter_data12 (u64 filter0, u64 filter1)
 {
   cj_dump_internal (1, filter0, 1, filter1);
 }

 static clib_error_t *
 cj_command_fn (vlib_main_t * vm,
 	       unformat_input_t * input, vlib_cli_command_t * cmd)
 {
   int is_enable = -1;
   int is_dump = -1;
   unformat_input_t _line_input, *line_input = &_line_input;
   clib_error_t *error = NULL;

   /* Get a line of input. */
   if (!unformat_user (input, unformat_line_input, line_input))
     return clib_error_return (0, "expected enable | disable | dump");

   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
     {
       if (unformat (line_input, "enable") || unformat (line_input, "on"))
 	is_enable = 1;
       else if (unformat (line_input, "disable")
 	       || unformat (line_input, "off"))
 	is_enable = 0;
       else if (unformat (line_input, "dump"))
 	is_dump = 1;
       else
 	{
 	  error = clib_error_return (0, "unknown input `%U'",
 				     format_unformat_error, line_input);
 	  goto done;
 	}
     }

   if (is_enable >= 0)
     cj_enable_disable (is_enable);

   if (is_dump > 0)
     cj_dump ();

 done:
   unformat_free (line_input);
   return error;
 }

 /*?
  * Enable, disable the collection of diagnostic data into a
  * circular journal or dump the circular journal diagnostic data.
  * This is only useful if you, the deveoper, have written code to make
  * use of the circular journal.
  *
  * When dumping the data it is formatted and sent to @c stderr of the
  * VPP process; when running VPP in <code>unix interactive</code> mode
  * this is typically the same place as the Debug CLI.
 ?*/

 /* *INDENT-OFF* */
 VLIB_CLI_COMMAND (cj_command,static) = {
   .path = "cj",
   .short_help = "cj <enable | disable | dump>",
   .function = cj_command_fn,
 };
 /* *INDENT-ON* */


 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	*------------------------------------------------------------------
	* cj.c
	*
	* Copyright (c) 2013 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*------------------------------------------------------------------
	*/

	/**
	* @file
	* Circular joournal diagnostic mechanism.
	*
	* The @c cj thread-safe circular log buffer scheme is occasionally useful
	* when chasing bugs. Calls to it should not be checked in.
	*/
	/? %%clicmd:group_label Circular Journal %% ?/
	/? %%syscfg:group_label Circular Journal %% ?/

	#include <stdio.h>
	#include <vlib/vlib.h>

	#include <vlib/unix/cj.h>

	cj_main_t cj_main;

	void
	cj_log (u32 type, void data0, void data1)
	{
	u64 new_tail;
	cj_main_t *cjm = &cj_main;
	cj_record_t *r;

	if (cjm->enable == 0)
	return;

	new_tail = __sync_add_and_fetch (&cjm->tail, 1);

	r = (cj_record_t *) & (cjm->records[new_tail & (cjm->num_records - 1)]);
	r->time = vlib_time_now (cjm->vlib_main);
	r->thread_index = vlib_get_thread_index ();
	r->type = type;
	r->data[0] = pointer_to_uword (data0);
	r->data[1] = pointer_to_uword (data1);
	}

	void
	cj_stop (void)
	{
	cj_main_t *cjm = &cj_main;

	cjm->enable = 0;
	}


	clib_error_t *
	cj_init (vlib_main_t * vm)
	{
	cj_main_t *cjm = &cj_main;

	cjm->vlib_main = vm;
	return 0;
	}

	VLIB_INIT_FUNCTION (cj_init);

	static clib_error_t *
	cj_config (vlib_main_t * vm, unformat_input_t * input)
	{
	cj_main_t *cjm = &cj_main;
	int matched = 0;
	int enable = 0;

	while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
	{
	if (unformat (input, "records %d", &cjm->num_records))
	matched = 1;
	else if (unformat (input, "on"))
	enable = 1;
	else
	return clib_error_return (0, "cj_config: unknown input '%U'",
	format_unformat_error, input);
	}

	if (matched == 0)
	return 0;

	cjm->num_records = max_pow2 (cjm->num_records);
	vec_validate (cjm->records, cjm->num_records - 1);
	memset (cjm->records, 0xff, cjm->num_records * sizeof (cj_record_t));
	cjm->tail = ~0;
	cjm->enable = enable;

	return 0;
	}

	/*?
	* Configure the circular journal diagnostic mechanism. This is only useful
	* if you, the deveoper, have written code to make use of the circular
	* journal.
	*
	* @cfgcmd{records, <number>}
	* Configure the number of records to allocate for the circular journal.
	*
	* @cfgcmd{on}
	* Enable the collection of records in the circular journal at the
	* earliest opportunity.
	?*/
	VLIB_CONFIG_FUNCTION (cj_config, "cj");

	void
	cj_enable_disable (int is_enable)
	{
	cj_main_t *cjm = &cj_main;

	if (cjm->num_records)
	cjm->enable = is_enable;
	else
	vlib_cli_output (cjm->vlib_main, "CJ not configured...");
	}

	static inline void
	cj_dump_one_record (cj_record_t * r)
	{
	fprintf (stderr, "[%d]: %10.6f T%02d %llx %llx\n",
	r->thread_index, r->time, r->type,
	(long long unsigned int) r->data[0],
	(long long unsigned int) r->data[1]);
	}

	static void
	cj_dump_internal (u8 filter0_enable, u64 filter0,
	u8 filter1_enable, u64 filter1)
	{
	cj_main_t *cjm = &cj_main;
	cj_record_t *r;
	u32 i, index;

	if (cjm->num_records == 0)
	{
	fprintf (stderr, "CJ not configured...\n");
	return;
	}

	if (cjm->tail == (u64) ~ 0)
	{
	fprintf (stderr, "No data collected...\n");
	return;
	}

	/* Has the trace wrapped? */
	index = (cjm->tail + 1) & (cjm->num_records - 1);
	r = &(cjm->records[index]);

	if (r->thread_index != (u32) ~ 0)
	{
	/* Yes, dump from tail + 1 to the end */
	for (i = index; i < cjm->num_records; i++)
	{
	if (filter0_enable && (r->data[0] != filter0))
	goto skip;
	if (filter1_enable && (r->data[1] != filter1))
	goto skip;
	cj_dump_one_record (r);
	skip:
	r++;
	}
	}
	/* dump from the beginning through the final tail */
	r = cjm->records;
	for (i = 0; i <= cjm->tail; i++)
	{
	if (filter0_enable && (r->data[0] != filter0))
	goto skip2;
	if (filter1_enable && (r->data[1] != filter1))
	goto skip2;
	cj_dump_one_record (r);
	skip2:
	r++;
	}
	}

	void
	cj_dump (void)
	{
	cj_dump_internal (0, 0, 0, 0);
	}

	void
	cj_dump_filter_data0 (u64 filter0)
	{
	cj_dump_internal (1 /* enable f0 */ , filter0, 0, 0);
	}

	void
	cj_dump_filter_data1 (u64 filter1)
	{
	cj_dump_internal (0, 0, 1 /* enable f1 */ , filter1);
	}

	void
	cj_dump_filter_data12 (u64 filter0, u64 filter1)
	{
	cj_dump_internal (1, filter0, 1, filter1);
	}

	static clib_error_t *
	cj_command_fn (vlib_main_t * vm,
	unformat_input_t * input, vlib_cli_command_t * cmd)
	{
	int is_enable = -1;
	int is_dump = -1;
	unformat_input_t _line_input, *line_input = &_line_input;
	clib_error_t *error = NULL;

	/* Get a line of input. */
	if (!unformat_user (input, unformat_line_input, line_input))
	return clib_error_return (0, "expected enable \| disable \| dump");

	while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
	{
	if (unformat (line_input, "enable") \|\| unformat (line_input, "on"))
	is_enable = 1;
	else if (unformat (line_input, "disable")
	\|\| unformat (line_input, "off"))
	is_enable = 0;
	else if (unformat (line_input, "dump"))
	is_dump = 1;
	else
	{
	error = clib_error_return (0, "unknown input `%U'",
	format_unformat_error, line_input);
	goto done;
	}
	}

	if (is_enable >= 0)
	cj_enable_disable (is_enable);

	if (is_dump > 0)
	cj_dump ();

	done:
	unformat_free (line_input);
	return error;
	}

	/*?
	* Enable, disable the collection of diagnostic data into a
	* circular journal or dump the circular journal diagnostic data.
	* This is only useful if you, the deveoper, have written code to make
	* use of the circular journal.
	*
	* When dumping the data it is formatted and sent to @c stderr of the
	* VPP process; when running VPP in <code>unix interactive</code> mode
	* this is typically the same place as the Debug CLI.
	?*/

	/* INDENT-OFF */
	VLIB_CLI_COMMAND (cj_command,static) = {
	.path = "cj",
	.short_help = "cj <enable \| disable \| dump>",
	.function = cj_command_fn,
	};
	/* INDENT-ON */


	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/