[PATCH net-next] bonding: add ESP offload features when slaves support

[Tariq Toukan <tariqt@nvidia.com>]

From: Jianbo Liu <jianbol@nvidia.com>

Add NETIF_F_GSO_ESP bit to bond's gso_partial_features if all slaves
support it, such that ESP segmentation is handled by hardware if possible.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Boris Pismenny <borisp@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/bonding/bond_main.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3928287f5865..f7c734cfb917 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1548,6 +1548,7 @@ static void bond_compute_features(struct bonding *bond)
 	netdev_features_t vlan_features = BOND_VLAN_FEATURES;
 	netdev_features_t enc_features  = BOND_ENC_FEATURES;
 #ifdef CONFIG_XFRM_OFFLOAD
+	netdev_features_t gso_partial_features = NETIF_F_GSO_ESP;
 	netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
 #endif /* CONFIG_XFRM_OFFLOAD */
 	netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
@@ -1575,6 +1576,9 @@ static void bond_compute_features(struct bonding *bond)
 		xfrm_features = netdev_increment_features(xfrm_features,
 							  slave->dev->hw_enc_features,
 							  BOND_XFRM_FEATURES);
+
+		if (slave->dev->hw_enc_features & NETIF_F_GSO_PARTIAL)
+			gso_partial_features &= slave->dev->gso_partial_features;
 #endif /* CONFIG_XFRM_OFFLOAD */
 
 		mpls_features = netdev_increment_features(mpls_features,
@@ -1590,6 +1594,13 @@ static void bond_compute_features(struct bonding *bond)
 	}
 	bond_dev->hard_header_len = max_hard_header_len;
 
+#ifdef CONFIG_XFRM_OFFLOAD
+	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;
+#endif /* CONFIG_XFRM_OFFLOAD */
+
 done:
 	bond_dev->vlan_features = vlan_features;
 	bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
-- 
2.44.0