netdev - [PATCH net-next 3/4] rtnetlink: fill IFLA_PARENT_DEV

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Date:   Tue,  8 Jun 2021 16:07:06 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     kuba@...nel.org, davem@...emloft.net
Cc:     netdev@...r.kernel.org, johannes.berg@...el.com, leon@...nel.org,
        m.chetan.kumar@...el.com, Sergey Ryazanov <ryazanov.s.a@...il.com>
Subject: [PATCH net-next 3/4] rtnetlink: fill IFLA_PARENT_DEV_NAME on link dump

From: Sergey Ryazanov <ryazanov.s.a@...il.com>

Return a parent device using the FLA_PARENT_DEV_NAME attribute during
links dump. This should help a user figure out which links belong to a
particular HW device. E.g. what data channels exists on a specific WWAN
modem.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
---
 net/core/rtnetlink.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 56ac16a..120887c 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1819,6 +1819,11 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
 	if (rtnl_fill_prop_list(skb, dev))
 		goto nla_put_failure;
 
+	if (dev->dev.parent &&
+	    nla_put_string(skb, IFLA_PARENT_DEV_NAME,
+			   dev_name(dev->dev.parent)))
+		goto nla_put_failure;
+
 	nlmsg_end(skb, nlh);
 	return 0;
 
-- 
2.7.4