[PATCHv3 net 2/3] bonding: fix xfrm offload feature setup on active-backup mode

Hangbin Liu
2025-02-27T08:37:56Z

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@gmail.com>
---
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 683bf1221caf..65e4b5d599e6 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4401,7 +4401,7 @@ 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 2a6a424806aa..ed16af6db557 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -568,18 +568,20 @@ static int bond_newlink(struct net *src_net, struct net_device *bond_dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
+ struct bonding *bond = netdev_priv(bond_dev);
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 8bb5f016969f..e5e005cd2e17 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -707,6 +707,7 @@ 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);
--
2.46.0