netdev - [PATCH iproute2 1/3] ip-link: display parentid for netdevs

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Message-Id: <1417802537-20020-1-git-send-email-gospo@cumulusnetworks.com>
Date:	Fri,  5 Dec 2014 13:02:15 -0500
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	netdev@...r.kernel.org
Cc:	sfeldma@...il.com, jpirko@...nulli.us
Subject: [PATCH iproute2 1/3] ip-link: display parentid for netdevs

Display parentid for netdev that may actually be associated with device
capable of offloading network forwarding.  Useful to identify which
netdevs are connected device when multiple forwarding elements are on a
system.

Based on patch from Jiri Pirko but with a different name for netlink
attribute.

Signed-off-by: Andy Gospodarek <gospo@...ulusnetworks.com>
---

I did not include definition for IFLA_PHYS_PARENT_ID as Stephen
indicated that patching if_link.h isn't needed since it will get pulled
later.

 ip/ipaddress.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 4d99324..d155085 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -581,6 +581,14 @@ int print_linkinfo(const struct sockaddr_nl *who,
 		fprintf(fp, "master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1));
 	}
 
+	if (tb[IFLA_PHYS_PARENT_ID]) {
+		SPRINT_BUF(b1);
+		fprintf(fp, "parentid %s ",
+			hexstring_n2a(RTA_DATA(tb[IFLA_PHYS_PARENT_ID]),
+				      RTA_PAYLOAD(tb[IFLA_PHYS_PARENT_ID]),
+				      b1, sizeof(b1)));
+	}
+
 	if (tb[IFLA_PHYS_PORT_ID]) {
 		SPRINT_BUF(b1);
 		fprintf(fp, "portid %s ",
-- 
1.9.3

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