netdev - [RFC 5/6 iproute2] iplink: add support for parent device

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Date:   Thu,  3 Jun 2021 07:49:53 +0300
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Johannes Berg <johannes@...solutions.net>,
        Loic Poulain <loic.poulain@...aro.org>
Cc:     M Chetan Kumar <m.chetan.kumar@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [RFC 5/6 iproute2] iplink: add support for parent device

Add support for specifying a parent device (struct device) by its name
during the link creation and printing parent name in the links list.
This option will be used to create WWAN links and possibly by other
device classes that do not have a "natural parent netdev".

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
---
 ip/ipaddress.c | 7 +++++++
 ip/iplink.c    | 6 +++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index cfb24f5c..98f25a5b 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -1176,6 +1176,13 @@ int print_linkinfo(struct nlmsghdr *n, void *arg)
 						   RTA_PAYLOAD(tb[IFLA_PHYS_SWITCH_ID]),
 						   b1, sizeof(b1)));
 		}
+
+		if (tb[IFLA_PARENT_DEV_NAME]) {
+			print_string(PRINT_ANY,
+				     "parentdev_name",
+				     "parentdev-name %s ",
+				     rta_getattr_str(tb[IFLA_PARENT_DEV_NAME]));
+		}
 	}
 
 	if ((do_link || show_details) && tb[IFLA_IFALIAS]) {
diff --git a/ip/iplink.c b/ip/iplink.c
index faafd7e8..190ce7d9 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -63,7 +63,7 @@ void iplink_usage(void)
 {
 	if (iplink_have_newlink()) {
 		fprintf(stderr,
-			"Usage: ip link add [link DEV] [ name ] NAME\n"
+			"Usage: ip link add [link DEV | parentdev-name NAME] [ name ] NAME\n"
 			"		    [ txqueuelen PACKETS ]\n"
 			"		    [ address LLADDR ]\n"
 			"		    [ broadcast LLADDR ]\n"
@@ -938,6 +938,10 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req, char **type)
 				       *argv);
 			addattr32(&req->n, sizeof(*req),
 				  IFLA_GSO_MAX_SEGS, max_segs);
+		} else if (strcmp(*argv, "parentdev-name") == 0) {
+			NEXT_ARG();
+			addattr_l(&req->n, sizeof(*req), IFLA_PARENT_DEV_NAME,
+				  *argv, strlen(*argv) + 1);
 		} else {
 			if (matches(*argv, "help") == 0)
 				usage();
-- 
2.26.3