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From:   Sergey Ryazanov <ryazanov.s.a@gmail.com>
To:     Johannes Berg <johannes@sipsolutions.net>,
        Loic Poulain <loic.poulain@linaro.org>
Cc:     M Chetan Kumar <m.chetan.kumar@intel.com>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Subject: [RFC 3/6] rtnetlink: fill IFLA_PARENT_DEV_NAME on link dump
Date:   Thu,  3 Jun 2021 07:49:51 +0300
Message-Id: <20210603044954.8091-4-ryazanov.s.a@gmail.com>
In-Reply-To: <20210603044954.8091-1-ryazanov.s.a@gmail.com>
References: <20210603044954.8091-1-ryazanov.s.a@gmail.com>
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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@gmail.com>
---
 net/core/rtnetlink.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 56ac16abe0ba..120887c892de 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;
 
-- 
2.26.3