netdev - [PATCH iproute2-next] bond: slave: print master name

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Message-ID: <20251017030509.61794-1-liuhangbin@gmail.com>
Date: Fri, 17 Oct 2025 03:05:09 +0000
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: Jay Vosburgh <jv@...sburgh.net>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	David Ahern <dsahern@...il.com>,
	linux-kselftest@...r.kernel.org,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH iproute2-next] bond: slave: print master name

Add a new attribute to display the name of the master interface for
each slave.

Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 ip/iplink_bond_slave.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/ip/iplink_bond_slave.c b/ip/iplink_bond_slave.c
index c88100e248dd..55deaadf5fe2 100644
--- a/ip/iplink_bond_slave.c
+++ b/ip/iplink_bond_slave.c
@@ -92,6 +92,17 @@ static void bond_slave_print_opt(struct link_util *lu, FILE *f, struct rtattr *t
 	if (!tb)
 		return;
 
+	if (tb[IFLA_BOND_SLAVE_MASTER]) {
+		unsigned int ifindex = rta_getattr_u32(tb[IFLA_BOND_SLAVE_MASTER]);
+
+		if (ifindex) {
+			print_string(PRINT_ANY,
+				     "master",
+				     "master %s ",
+				     ll_index_to_name(ifindex));
+		}
+	}
+
 	if (tb[IFLA_BOND_SLAVE_STATE])
 		print_slave_state(f, tb[IFLA_BOND_SLAVE_STATE]);
 
-- 
2.50.1