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Clean up rte_option

PATCH Applied Gaetan Rivet 2 participants 10 messages Dec 20, 2018 – Jan 15, 2019

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Gaetan Rivet

author
#0 lore raw

cover Clean up rte_option

rte_option lib might benefit from a few improvements.

Overview:

- list registered options on /rte/app --help
- check duplicates within base EAL options
- rename some fields to be closer to standard struct option and just cleaner overall.
- fix some strange code (static iterator?)
- fix doc, improve API a little...

Gaetan Rivet (8):
option: use bare option string as name
option: do not use static iterator
option: add usage string
option: rename name field
option: check against common option on register
option: fix log level of error in register
option: improve library documentation
option: return an error when register fail

 lib/librte_eal/common/eal_common_options.c |  1 +
 lib/librte_eal/common/eal_private.h        |  7 +++
 lib/librte_eal/common/include/rte_option.h | 17 +++++--
 lib/librte_eal/common/rte_option.c         | 57 +++++++++++++++++++---
 lib/librte_telemetry/rte_telemetry.c       |  3 +-
 5 files changed, 72 insertions(+), 13 deletions(-)
Signature · 1 line
2.19.1
author
#1 lore raw

PATCH 1/8 option: use bare option string as name

Current options name can be passed with arbitrary format. Force the use of "--" prefix and thus POSIX long options format.

This restricts the ability to introduce surprising options and will help future additional checks.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/rte_option.c   | 6 +++++-
 lib/librte_telemetry/rte_telemetry.c | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)
lib/librte_eal/common/rte_option.c +5 -1
index 088e0fd23..3fbc13a6a 100644
@@ -20,9 +20,13 @@ static struct rte_option *option;
 int
 rte_option_parse(const char *opt)
 {
+	if (strlen(opt) <= 2 ||
+	    strncmp(opt, "--", 2))
+		return -1;
+
 	/* Check if the option is registered */
 	TAILQ_FOREACH(option, &rte_option_list, next) {
-		if (strcmp(opt, option->opt_str) == 0) {
+		if (strcmp(&opt[2], option->opt_str) == 0) {
 			option->enabled = 1;
 			return 0;
 		}
lib/librte_telemetry/rte_telemetry.c +1 -1
index 016431f12..3080bb715 100644
@@ -1798,7 +1798,7 @@ rte_telemetry_json_socket_message_test(struct telemetry_impl *telemetry, int fd)
 int telemetry_log_level;
 
 static struct rte_option option = {
-	.opt_str = "--telemetry",
+	.opt_str = "telemetry",
 	.cb = &rte_telemetry_init,
 	.enabled = 0
 };
Signature · 1 line
2.19.1
author
#2 lore raw

PATCH 2/8 option: do not use static iterator

In reply to Gaetan Rivet

This is rather weird. Someone should have caught that during review.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/rte_option.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
lib/librte_eal/common/rte_option.c +6 -2
index 3fbc13a6a..9e233f7d2 100644
@@ -15,11 +15,11 @@ TAILQ_HEAD(rte_option_list, rte_option);
 struct rte_option_list rte_option_list =
 	TAILQ_HEAD_INITIALIZER(rte_option_list);
 
-static struct rte_option *option;
-
 int
 rte_option_parse(const char *opt)
 {
+	struct rte_option *option;
+
 	if (strlen(opt) <= 2 ||
 	    strncmp(opt, "--", 2))
 		return -1;

@@ -38,6 +38,8 @@ rte_option_parse(const char *opt)
 void __rte_experimental
 rte_option_register(struct rte_option *opt)
 {
+	struct rte_option *option;
+
 	TAILQ_FOREACH(option, &rte_option_list, next) {
 		if (strcmp(opt->opt_str, option->opt_str) == 0) {
 			RTE_LOG(INFO, EAL, "Option %s has already been registered.\n",

@@ -52,6 +54,8 @@ rte_option_register(struct rte_option *opt)
 void
 rte_option_init(void)
 {
+	struct rte_option *option;
+
 	TAILQ_FOREACH(option, &rte_option_list, next) {
 		if (option->enabled)
 			option->cb();
Signature · 1 line
2.19.1
author
#3 lore raw

PATCH 3/8 option: add usage string

In reply to Gaetan Rivet

Add a usage string field in rte_option, allowing to display help to the user and describe which options are currently available.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/eal_common_options.c |  1 +
 lib/librte_eal/common/eal_private.h        |  7 +++++++
 lib/librte_eal/common/include/rte_option.h |  1 +
 lib/librte_eal/common/rte_option.c         | 17 +++++++++++++++++
 lib/librte_telemetry/rte_telemetry.c       |  1 +
 5 files changed, 27 insertions(+)
lib/librte_eal/common/eal_common_options.c +1 -0
index 6e3a83b98..e096ac896 100644
@@ -1494,4 +1494,5 @@ eal_common_usage(void)
 	       "  --"OPT_NO_HPET"           Disable HPET\n"
 	       "  --"OPT_NO_SHCONF"         No shared config (mmap'd files)\n"
 	       "\n", RTE_MAX_LCORE);
+	rte_option_usage();
 }
lib/librte_eal/common/eal_private.h +7 -0
index 442c6dc48..50ab58385 100644
@@ -370,4 +370,11 @@ rte_option_parse(const char *opt);
 void
 rte_option_init(void);
 
+/**
+ * Iterate through the registered options and show the associated
+ * usage string.
+ */
+void
+rte_option_usage(void);
+
 #endif /* _EAL_PRIVATE_H_ */
lib/librte_eal/common/include/rte_option.h +1 -0
index 8957b970c..bbcc6cec9 100644
@@ -35,6 +35,7 @@ typedef int (*rte_option_cb)(void);
 struct rte_option {
 	TAILQ_ENTRY(rte_option) next; /**< Next entry in the list. */
 	char *opt_str;             /**< The option name. */
+	const char *usage; /**< Option summary string. */
 	rte_option_cb cb;          /**< Function called when option is used. */
 	int enabled;               /**< Set when the option is used. */
 };
lib/librte_eal/common/rte_option.c +17 -0
index 9e233f7d2..2ed74873b 100644
@@ -61,3 +61,20 @@ rte_option_init(void)
 			option->cb();
 	}
 }
+
+void
+rte_option_usage(void)
+{
+	struct rte_option *option;
+	int opt_count = 0;
+
+	TAILQ_FOREACH(option, &rte_option_list, next)
+		opt_count += 1;
+	if (opt_count == 0)
+		return;
+
+	printf("EAL dynamic options:\n");
+	TAILQ_FOREACH(option, &rte_option_list, next)
+		printf("  --%-*s %s\n", 17, option->opt_str, option->usage);
+	printf("\n");
+}
lib/librte_telemetry/rte_telemetry.c +1 -0
index 3080bb715..0ba6626c1 100644
@@ -1799,6 +1799,7 @@ int telemetry_log_level;
 
 static struct rte_option option = {
 	.opt_str = "telemetry",
+	.usage = "Enable telemetry backend",
 	.cb = &rte_telemetry_init,
 	.enabled = 0
 };
Signature · 1 line
2.19.1
author
#4 lore raw

PATCH 4/8 option: rename name field

In reply to Gaetan Rivet

option->opt_* is redundant.
The field should also be constant.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/include/rte_option.h | 2 +-
 lib/librte_eal/common/rte_option.c         | 8 ++++----
 lib/librte_telemetry/rte_telemetry.c       | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)
lib/librte_eal/common/include/rte_option.h +1 -1
index bbcc6cec9..eea95e477 100644
@@ -34,7 +34,7 @@ typedef int (*rte_option_cb)(void);
  */
 struct rte_option {
 	TAILQ_ENTRY(rte_option) next; /**< Next entry in the list. */
-	char *opt_str;             /**< The option name. */
+	const char *name; /**< The option name. */
 	const char *usage; /**< Option summary string. */
 	rte_option_cb cb;          /**< Function called when option is used. */
 	int enabled;               /**< Set when the option is used. */
lib/librte_eal/common/rte_option.c +4 -4
index 2ed74873b..d94363872 100644
@@ -26,7 +26,7 @@ rte_option_parse(const char *opt)
 
 	/* Check if the option is registered */
 	TAILQ_FOREACH(option, &rte_option_list, next) {
-		if (strcmp(&opt[2], option->opt_str) == 0) {
+		if (strcmp(&opt[2], option->name) == 0) {
 			option->enabled = 1;
 			return 0;
 		}

@@ -41,9 +41,9 @@ rte_option_register(struct rte_option *opt)
 	struct rte_option *option;
 
 	TAILQ_FOREACH(option, &rte_option_list, next) {
-		if (strcmp(opt->opt_str, option->opt_str) == 0) {
+		if (strcmp(opt->name, option->name) == 0) {
 			RTE_LOG(INFO, EAL, "Option %s has already been registered.\n",
-					opt->opt_str);
+					opt->name);
 			return;
 		}
 	}

@@ -75,6 +75,6 @@ rte_option_usage(void)
 
 	printf("EAL dynamic options:\n");
 	TAILQ_FOREACH(option, &rte_option_list, next)
-		printf("  --%-*s %s\n", 17, option->opt_str, option->usage);
+		printf("  --%-*s %s\n", 17, option->name, option->usage);
 	printf("\n");
 }
lib/librte_telemetry/rte_telemetry.c +1 -1
index 0ba6626c1..3ba7ae8de 100644
@@ -1798,7 +1798,7 @@ rte_telemetry_json_socket_message_test(struct telemetry_impl *telemetry, int fd)
 int telemetry_log_level;
 
 static struct rte_option option = {
-	.opt_str = "telemetry",
+	.name = "telemetry",
 	.usage = "Enable telemetry backend",
 	.cb = &rte_telemetry_init,
 	.enabled = 0
Signature · 1 line
2.19.1
author
#5 lore raw

PATCH 5/8 option: check against common option on register

In reply to Gaetan Rivet

Not only check against other registered options, but also common EAL options. This will mitigate user confusion.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/rte_option.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
lib/librte_eal/common/rte_option.c +14 -0
index d94363872..ae8a0e2ca 100644
@@ -2,6 +2,7 @@
  * Copyright(c) 2018 Intel Corporation.
  */
 
+#include <getopt.h>
 #include <unistd.h>
 #include <string.h>
 

@@ -9,6 +10,8 @@
 #include <rte_option.h>
 
 #include "eal_private.h"
+#include "eal_internal_cfg.h" /* Necessary for eal_options.h */
+#include "eal_options.h"
 
 TAILQ_HEAD(rte_option_list, rte_option);
 

@@ -39,6 +42,17 @@ void __rte_experimental
 rte_option_register(struct rte_option *opt)
 {
 	struct rte_option *option;
+	const struct option *gopt;
+
+	gopt = &eal_long_options[0];
+	while (gopt->name != NULL) {
+		if (strcmp(gopt->name, opt->name) == 0) {
+			RTE_LOG(ERR, EAL, "Option %s is already a common EAL option.\n",
+					opt->name);
+			return;
+		}
+		gopt++;
+	}
 
 	TAILQ_FOREACH(option, &rte_option_list, next) {
 		if (strcmp(opt->name, option->name) == 0) {
Signature · 1 line
2.19.1
author
#6 lore raw

PATCH 6/8 option: fix log level of error in register

In reply to Gaetan Rivet

INFO is not correct when logging an error.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/rte_option.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
lib/librte_eal/common/rte_option.c +1 -1
index ae8a0e2ca..b2c93b220 100644
@@ -56,7 +56,7 @@ rte_option_register(struct rte_option *opt)
 
 	TAILQ_FOREACH(option, &rte_option_list, next) {
 		if (strcmp(opt->name, option->name) == 0) {
-			RTE_LOG(INFO, EAL, "Option %s has already been registered.\n",
+			RTE_LOG(ERR, EAL, "Option %s has already been registered.\n",
 					opt->name);
 			return;
 		}
Signature · 1 line
2.19.1
author
#7 lore raw

PATCH 7/8 option: improve library documentation

In reply to Gaetan Rivet

Use doxygen to describe the main structure and describe a little more why it exists.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/include/rte_option.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
lib/librte_eal/common/include/rte_option.h +6 -2
index eea95e477..20be47d91 100644
@@ -29,8 +29,12 @@ extern "C" {
 
 typedef int (*rte_option_cb)(void);
 
-/*
- * Structure describing the EAL command line option being registered.
+/**
+ * Structure describing an EAL command line option dynamically registered.
+ *
+ * Common EAL options are mostly statically defined.
+ * Some libraries need additional options to be dynamically added.
+ * This structure describes such options.
  */
 struct rte_option {
 	TAILQ_ENTRY(rte_option) next; /**< Next entry in the list. */
Signature · 1 line
2.19.1
author
#8 lore raw

PATCH 8/8 option: return an error when register fail

In reply to Gaetan Rivet

Make rte_option_register return a negative value when an error occur.

Signed-off-by Gaetan Rivet <[email protected]>
---
 lib/librte_eal/common/include/rte_option.h | 6 +++++-
 lib/librte_eal/common/rte_option.c         | 8 +++++---
 2 files changed, 10 insertions(+), 4 deletions(-)
lib/librte_eal/common/include/rte_option.h +5 -1
index 20be47d91..7ad65a4eb 100644
@@ -57,8 +57,12 @@ struct rte_option {
  *
  * @param opt
  *  Structure describing the option to parse.
+ *
+ * @return
+ *  0 on success, <0 otherwise.
  */
-void __rte_experimental
+__rte_experimental
+int
 rte_option_register(struct rte_option *opt);
 
 #ifdef __cplusplus
lib/librte_eal/common/rte_option.c +5 -3
index b2c93b220..fe7f2ab4e 100644
@@ -38,7 +38,8 @@ rte_option_parse(const char *opt)
 	return -1;
 }
 
-void __rte_experimental
+__rte_experimental
+int
 rte_option_register(struct rte_option *opt)
 {
 	struct rte_option *option;

@@ -49,7 +50,7 @@ rte_option_register(struct rte_option *opt)
 		if (strcmp(gopt->name, opt->name) == 0) {
 			RTE_LOG(ERR, EAL, "Option %s is already a common EAL option.\n",
 					opt->name);
-			return;
+			return -1;
 		}
 		gopt++;
 	}

@@ -58,11 +59,12 @@ rte_option_register(struct rte_option *opt)
 		if (strcmp(opt->name, option->name) == 0) {
 			RTE_LOG(ERR, EAL, "Option %s has already been registered.\n",
 					opt->name);
-			return;
+			return -1;
 		}
 	}
 
 	TAILQ_INSERT_HEAD(&rte_option_list, opt, next);
+	return 0;
 }
 
 void
Signature · 1 line
2.19.1
Applied
#9 lore raw
In reply to Gaetan Rivet

20/12/2018 18:06, Gaetan Rivet:

Quoted 11 lines

rte_option lib might benefit from a few improvements.

Overview:

- list registered options on /rte/app --help
- check duplicates within base EAL options
- rename some fields to be closer to standard struct option and just cleaner overall.
- fix some strange code (static iterator?)
- fix doc, improve API a little...

Quoted 9 lines

Gaetan Rivet (8):
option: use bare option string as name
option: do not use static iterator
option: add usage string
option: rename name field
option: check against common option on register
option: fix log level of error in register
option: improve library documentation
option: return an error when register fail

Several weeks passed without any comment.

Applied, thanks