netdev - [patch iproute2-next 1/2] devlink: introduce cmdline option to switch to a different namespace

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Message-Id: <20190914065757.27295-1-jiri@resnulli.us>
Date:   Sat, 14 Sep 2019 08:57:56 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, dsahern@...il.com,
        jakub.kicinski@...ronome.com, tariqt@...lanox.com,
        saeedm@...lanox.com, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        shuah@...nel.org, mlxsw@...lanox.com
Subject: [patch iproute2-next 1/2] devlink: introduce cmdline option to switch to a different namespace

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

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
v3->v4:
- rebased on top of trap patches
---
 devlink/devlink.c  | 12 ++++++++++--
 man/man8/devlink.8 |  4 ++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index a1be8528c3c9..8020d76dd7f7 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -31,6 +31,7 @@
 #include "mnlg.h"
 #include "json_writer.h"
 #include "utils.h"
+#include "namespace.h"
 
 #define ESWITCH_MODE_LEGACY "legacy"
 #define ESWITCH_MODE_SWITCHDEV "switchdev"
@@ -6748,7 +6749,7 @@ static int cmd_trap(struct dl *dl)
 static void help(void)
 {
 	pr_err("Usage: devlink [ OPTIONS ] OBJECT { COMMAND | help }\n"
-	       "       devlink [ -f[orce] ] -b[atch] filename\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");
 }
@@ -6898,6 +6899,7 @@ int main(int argc, char **argv)
 		{ "pretty",		no_argument,		NULL, 'p' },
 		{ "verbose",		no_argument,		NULL, 'v' },
 		{ "statistics",		no_argument,		NULL, 's' },
+		{ "Netns",		required_argument,	NULL, 'N' },
 		{ NULL, 0, NULL, 0 }
 	};
 	const char *batch_file = NULL;
@@ -6913,7 +6915,7 @@ int main(int argc, char **argv)
 		return EXIT_FAILURE;
 	}
 
-	while ((opt = getopt_long(argc, argv, "Vfb:njpvs",
+	while ((opt = getopt_long(argc, argv, "Vfb:njpvsN:",
 				  long_options, NULL)) >= 0) {
 
 		switch (opt) {
@@ -6942,6 +6944,12 @@ int main(int argc, char **argv)
 		case 's':
 			dl->stats = true;
 			break;
+		case 'N':
+			if (netns_switch(optarg)) {
+				ret = EXIT_FAILURE;
+				goto dl_free;
+			}
+			break;
 		default:
 			pr_err("Unknown option.\n");
 			help();
diff --git a/man/man8/devlink.8 b/man/man8/devlink.8
index 12d489440a3d..7f4eda568081 100644
--- a/man/man8/devlink.8
+++ b/man/man8/devlink.8
@@ -55,6 +55,10 @@ Turn on verbose output.
 .BR "\-s" , " --statistics"
 Output statistics.
 
+.TP
+.BR "\-N", " \-Netns " <NETNSNAME>
+Switches to the specified network namespace.
+
 .SS
 .I OBJECT
 
-- 
2.21.0