[PATCH 6.12 052/460] bonding: Correctly support GSO ESP offload

Greg Kroah-Hartman
2026-03-23T14:15:31Z

6.12-stable review patch. If anyone has any objections, please let me know.

------------------

From: Cosmin Ratiu <cratiu@nvidia.com>

[ Upstream commit 9e6c4e6b605c1fa3e24f74ee0b641e95f090188a ]

The referenced fix is incomplete. It correctly computes
bond_dev->gso_partial_features across slaves, but unfortunately
netdev_fix_features discards gso_partial_features from the feature set
if NETIF_F_GSO_PARTIAL isn't set in bond_dev->features.

This is visible with ethtool -k bond0 | grep esp:
tx-esp-segmentation: off [requested on]
esp-hw-offload: on
esp-tx-csum-hw-offload: on

This patch reworks the bonding GSO offload support by:
- making aggregating gso_partial_features across slaves similar to the
other feature sets (this part is a no-op).
- advertising the default partial gso features on empty bond devs, same
as with other feature sets (also a no-op).
- adding NETIF_F_GSO_PARTIAL to hw_enc_features filtered across slaves.
- adding NETIF_F_GSO_PARTIAL to features in bond_setup()

With all of these, 'ethtool -k bond0 | grep esp' now reports:
tx-esp-segmentation: on
esp-hw-offload: on
esp-tx-csum-hw-offload: on

Fixes: 4861333b4217 ("bonding: add ESP offload features when slaves support")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Acked-by: Jay Vosburgh <jv@jvosburgh.net>
Link: https://patch.msgid.link/20250127104147.759658-1-cratiu@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Stable-dep-of: 950803f72547 ("bonding: fix type confusion in bond_setup_by_slave()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/bonding/bond_main.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index aac385607ac42..fe29a0911308d 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1548,17 +1548,20 @@ static netdev_features_t bond_fix_features(struct net_device *dev,
NETIF_F_HIGHDMA | NETIF_F_LRO)

#define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
- NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
+ NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE | \
+ NETIF_F_GSO_PARTIAL)

#define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
NETIF_F_GSO_SOFTWARE)

+#define BOND_GSO_PARTIAL_FEATURES (NETIF_F_GSO_ESP)
+

static void bond_compute_features(struct bonding *bond)
{
+ netdev_features_t gso_partial_features = BOND_GSO_PARTIAL_FEATURES;
unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
IFF_XMIT_DST_RELEASE_PERM;
- netdev_features_t gso_partial_features = NETIF_F_GSO_ESP;
netdev_features_t vlan_features = BOND_VLAN_FEATURES;
netdev_features_t enc_features = BOND_ENC_FEATURES;
#ifdef CONFIG_XFRM_OFFLOAD
@@ -1592,8 +1595,9 @@ static void bond_compute_features(struct bonding *bond)
BOND_XFRM_FEATURES);
#endif /* CONFIG_XFRM_OFFLOAD */

- if (slave->dev->hw_enc_features & NETIF_F_GSO_PARTIAL)
- gso_partial_features &= slave->dev->gso_partial_features;
+ gso_partial_features = netdev_increment_features(gso_partial_features,
+ slave->dev->gso_partial_features,
+ BOND_GSO_PARTIAL_FEATURES);

mpls_features = netdev_increment_features(mpls_features,
slave->dev->mpls_features,
@@ -1608,12 +1612,8 @@ static void bond_compute_features(struct bonding *bond)
}
bond_dev->hard_header_len = max_hard_header_len;

- if (gso_partial_features & NETIF_F_GSO_ESP)
- bond_dev->gso_partial_features |= NETIF_F_GSO_ESP;
- else
- bond_dev->gso_partial_features &= ~NETIF_F_GSO_ESP;
-
done:
+ bond_dev->gso_partial_features = gso_partial_features;
bond_dev->vlan_features = vlan_features;
bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
NETIF_F_HW_VLAN_CTAG_TX |
@@ -6082,6 +6082,7 @@ void bond_setup(struct net_device *bond_dev)
bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
bond_dev->features |= bond_dev->hw_features;
bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+ bond_dev->features |= NETIF_F_GSO_PARTIAL;
#ifdef CONFIG_XFRM_OFFLOAD
bond_dev->hw_features |= BOND_XFRM_FEATURES;
/* Only enable XFRM features if this is an active-backup config */
--
2.51.0