netdev - [PATCH net-next] net/hsr: add interlink to fill

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Message-ID: <20251015101001.25670-2-jvaclav@redhat.com>
Date: Wed, 15 Oct 2025 12:10:02 +0200
From: Jan Vaclav <jvaclav@...hat.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Simon Horman <horms@...nel.org>,
	Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	Jan Vaclav <jvaclav@...hat.com>
Subject: [PATCH net-next] net/hsr: add interlink to fill_info output

Currently, it is possible to configure the interlink
port, but no way to read it back from userspace.

Add it to the output of hsr_fill_info(), so it can be
read from userspace, for example:

$ ip -d link show hsr0
12: hsr0: <BROADCAST,MULTICAST> mtu ...
...
hsr slave1 veth0 slave2 veth1 interlink veth2 ...

Signed-off-by: Jan Vaclav <jvaclav@...hat.com>
---
 net/hsr/hsr_netlink.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index 4461adf69623..851187130755 100644
--- a/net/hsr/hsr_netlink.c
+++ b/net/hsr/hsr_netlink.c
@@ -160,6 +160,12 @@ static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
 			goto nla_put_failure;
 	}
 
+	port = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK);
+	if (port) {
+		if (nla_put_u32(skb, IFLA_HSR_INTERLINK, port->dev->ifindex))
+			goto nla_put_failure;
+	}
+
 	if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
 		    hsr->sup_multicast_addr) ||
 	    nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
-- 
2.51.0