netdev - [patch iproute2-next v3] devlink: introduce -[he]x cmdline option to allow dumping numbers in hex format

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Date:   Mon, 25 Apr 2022 12:36:27 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     sthemmin@...rosoft.com, dsahern@...il.com, snelson@...sando.io
Subject: [patch iproute2-next v3] devlink: introduce -[he]x cmdline option to allow dumping numbers in hex format

From: Jiri Pirko <jiri@...dia.com>

For health reporter dumps it is quite convenient to have the numbers in
hexadecimal format. Introduce a command line option to allow user to
achieve that output.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
v2->v3:
- fixed patch subject
v1->v2:
- changed the hex output option to "-x"
- added "0x" prefix to hex numbers
---
 devlink/devlink.c  | 19 +++++++++++++------
 man/man8/devlink.8 |  4 ++++
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index da9f97788bcf..7ace968ca081 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -367,6 +367,7 @@ struct dl {
 	bool pretty_output;
 	bool verbose;
 	bool stats;
+	bool hex;
 	struct {
 		bool present;
 		char *bus_name;
@@ -8044,6 +8045,8 @@ static int cmd_health_dump_clear(struct dl *dl)
 
 static int fmsg_value_show(struct dl *dl, int type, struct nlattr *nl_data)
 {
+	const char *num_fmt = dl->hex ? "%#x" : "%u";
+	const char *num64_fmt = dl->hex ? "%#"PRIx64 : "%"PRIu64;
 	uint8_t *data;
 	uint32_t len;
 
@@ -8053,16 +8056,16 @@ static int fmsg_value_show(struct dl *dl, int type, struct nlattr *nl_data)
 		print_bool(PRINT_ANY, NULL, "%s", mnl_attr_get_u8(nl_data));
 		break;
 	case MNL_TYPE_U8:
-		print_uint(PRINT_ANY, NULL, "%u", mnl_attr_get_u8(nl_data));
+		print_uint(PRINT_ANY, NULL, num_fmt, mnl_attr_get_u8(nl_data));
 		break;
 	case MNL_TYPE_U16:
-		print_uint(PRINT_ANY, NULL, "%u", mnl_attr_get_u16(nl_data));
+		print_uint(PRINT_ANY, NULL, num_fmt, mnl_attr_get_u16(nl_data));
 		break;
 	case MNL_TYPE_U32:
-		print_uint(PRINT_ANY, NULL, "%u", mnl_attr_get_u32(nl_data));
+		print_uint(PRINT_ANY, NULL, num_fmt, mnl_attr_get_u32(nl_data));
 		break;
 	case MNL_TYPE_U64:
-		print_u64(PRINT_ANY, NULL, "%"PRIu64, mnl_attr_get_u64(nl_data));
+		print_u64(PRINT_ANY, NULL, num64_fmt, mnl_attr_get_u64(nl_data));
 		break;
 	case MNL_TYPE_NUL_STRING:
 		print_string(PRINT_ANY, NULL, "%s", mnl_attr_get_str(nl_data));
@@ -8928,7 +8931,7 @@ static void help(void)
 	pr_err("Usage: devlink [ OPTIONS ] OBJECT { COMMAND | help }\n"
 	       "       devlink [ -f[orce] ] -b[atch] filename -N[etns] netnsname\n"
 	       "where  OBJECT := { dev | port | sb | monitor | dpipe | resource | region | health | trap }\n"
-	       "       OPTIONS := { -V[ersion] | -n[o-nice-names] | -j[son] | -p[retty] | -v[erbose] -s[tatistics] }\n");
+	       "       OPTIONS := { -V[ersion] | -n[o-nice-names] | -j[son] | -p[retty] | -v[erbose] -s[tatistics] -[he]x }\n");
 }
 
 static int dl_cmd(struct dl *dl, int argc, char **argv)
@@ -9042,6 +9045,7 @@ int main(int argc, char **argv)
 		{ "statistics",		no_argument,		NULL, 's' },
 		{ "Netns",		required_argument,	NULL, 'N' },
 		{ "iec",		no_argument,		NULL, 'i' },
+		{ "hex",		no_argument,		NULL, 'x' },
 		{ NULL, 0, NULL, 0 }
 	};
 	const char *batch_file = NULL;
@@ -9057,7 +9061,7 @@ int main(int argc, char **argv)
 		return EXIT_FAILURE;
 	}
 
-	while ((opt = getopt_long(argc, argv, "Vfb:njpvsN:i",
+	while ((opt = getopt_long(argc, argv, "Vfb:njpvsN:ix",
 				  long_options, NULL)) >= 0) {
 
 		switch (opt) {
@@ -9095,6 +9099,9 @@ int main(int argc, char **argv)
 		case 'i':
 			use_iec = true;
 			break;
+		case 'x':
+			dl->hex = true;
+			break;
 		default:
 			pr_err("Unknown option.\n");
 			help();
diff --git a/man/man8/devlink.8 b/man/man8/devlink.8
index 840cf44cf97b..de53061bc880 100644
--- a/man/man8/devlink.8
+++ b/man/man8/devlink.8
@@ -63,6 +63,10 @@ Switches to the specified network namespace.
 .BR "\-i", " --iec"
 Print human readable rates in IEC units (e.g. 1Ki = 1024).
 
+.TP
+.BR "\-x", " --hex"
+Print dump numbers in hexadecimal format.
+
 .SS
 .I OBJECT
 
-- 
2.35.1