netdev - [PATCHv2 net 1/2] bonding: fix xfrm offload feature setup on active-backup mode

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Message-ID: <20250918020202.440904-1-liuhangbin@gmail.com>
Date: Thu, 18 Sep 2025 02:02:01 +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>,
	Shuah Khan <shuah@...nel.org>,
	Petr Machata <petrm@...dia.com>,
	linux-kselftest@...r.kernel.org,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCHv2 net 1/2] bonding: fix xfrm offload feature setup on active-backup mode

The active-backup bonding mode supports XFRM ESP offload. However, when
a bond is added using command like `ip link add bond0 type bond mode 1
miimon 100`, the `ethtool -k` command shows that the XFRM ESP offload is
disabled. This occurs because, in bond_newlink(), we change bond link
first and register bond device later. So the XFRM feature update in
bond_option_mode_set() is not called as the bond device is not yet
registered, leading to the offload feature not being set successfully.

To resolve this issue, we can modify the code order in bond_newlink() to
ensure that the bond device is registered first before changing the bond
link parameters. This change will allow the XFRM ESP offload feature to be
correctly enabled.

Fixes: 007ab5345545 ("bonding: fix feature flag setting at init time")
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
v2: rebase to latest net, no code update
---
 drivers/net/bonding/bond_main.c    |  2 +-
 drivers/net/bonding/bond_netlink.c | 16 +++++++++-------
 include/net/bonding.h              |  1 +
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 57be04f6cb11..f4f0feddd9fa 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4411,7 +4411,7 @@ void bond_work_init_all(struct bonding *bond)
 	INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
 }
 
-static void bond_work_cancel_all(struct bonding *bond)
+void bond_work_cancel_all(struct bonding *bond)
 {
 	cancel_delayed_work_sync(&bond->mii_work);
 	cancel_delayed_work_sync(&bond->arp_work);
diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 57fff2421f1b..7a9d73ec8e91 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -579,20 +579,22 @@ static int bond_newlink(struct net_device *bond_dev,
 			struct rtnl_newlink_params *params,
 			struct netlink_ext_ack *extack)
 {
+	struct bonding *bond = netdev_priv(bond_dev);
 	struct nlattr **data = params->data;
 	struct nlattr **tb = params->tb;
 	int err;
 
-	err = bond_changelink(bond_dev, tb, data, extack);
-	if (err < 0)
+	err = register_netdevice(bond_dev);
+	if (err)
 		return err;
 
-	err = register_netdevice(bond_dev);
-	if (!err) {
-		struct bonding *bond = netdev_priv(bond_dev);
+	netif_carrier_off(bond_dev);
+	bond_work_init_all(bond);
 
-		netif_carrier_off(bond_dev);
-		bond_work_init_all(bond);
+	err = bond_changelink(bond_dev, tb, data, extack);
+	if (err) {
+		bond_work_cancel_all(bond);
+		unregister_netdevice(bond_dev);
 	}
 
 	return err;
diff --git a/include/net/bonding.h b/include/net/bonding.h
index e06f0d63b2c1..bd56ad976cfb 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -711,6 +711,7 @@ struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 void bond_work_init_all(struct bonding *bond);
+void bond_work_cancel_all(struct bonding *bond);
 
 #ifdef CONFIG_PROC_FS
 void bond_create_proc_entry(struct bonding *bond);
-- 
2.50.1