!213 net: bonding: Inherit MPLS features from slave devices

Merge Pull Request from: @CTC-XiboWang 
 
This PR is cherry-pick from upstream "net: bonding: Inherit MPLS features from slave devices"

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/bonding?id=2e770b507ccde8eedc129946e4b78ceed0a22df2 
 
Link:https://gitee.com/openeuler/kernel/pulls/213 

Reviewed-by: Laibin Qiu <qiulaibin@huawei.com> 
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com> 
Reviewed-by: Jackie Liu <liuyun01@kylinos.cn> 
Reviewed-by: Yue Haibing <yuehaibing@huawei.com> 
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> 

drivers/net/bonding/bond_main.c

@@ -1072,12 +1072,16 @@ static netdev_features_t bond_fix_features(struct net_device *dev,
 #define BOND_ENC_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
 				 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
 
+#define BOND_MPLS_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
+				 NETIF_F_ALL_TSO)
+
 static void bond_compute_features(struct bonding *bond)
 {
 	unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
 					IFF_XMIT_DST_RELEASE_PERM;
 	netdev_features_t vlan_features = BOND_VLAN_FEATURES;
 	netdev_features_t enc_features  = BOND_ENC_FEATURES;
+	netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
 	struct net_device *bond_dev = bond->dev;
 	struct list_head *iter;
 	struct slave *slave;
@@ -1088,6 +1092,7 @@ static void bond_compute_features(struct bonding *bond)
 	if (!bond_has_slaves(bond))
 		goto done;
 	vlan_features &= NETIF_F_ALL_FOR_ALL;
+	mpls_features &= NETIF_F_ALL_FOR_ALL;
 
 	bond_for_each_slave(bond, slave, iter) {
 		vlan_features = netdev_increment_features(vlan_features,
@@ -1096,6 +1101,11 @@ static void bond_compute_features(struct bonding *bond)
 		enc_features = netdev_increment_features(enc_features,
 							 slave->dev->hw_enc_features,
 							 BOND_ENC_FEATURES);
+
+		mpls_features = netdev_increment_features(mpls_features,
+							  slave->dev->mpls_features,
+							  BOND_MPLS_FEATURES);
+
 		dst_release_flag &= slave->dev->priv_flags;
 		if (slave->dev->hard_header_len > max_hard_header_len)
 			max_hard_header_len = slave->dev->hard_header_len;
@@ -1111,6 +1121,7 @@ static void bond_compute_features(struct bonding *bond)
 				    NETIF_F_HW_VLAN_CTAG_TX |
 				    NETIF_F_HW_VLAN_STAG_TX |
 				    NETIF_F_GSO_UDP_L4;
+	bond_dev->mpls_features = mpls_features;
 	bond_dev->gso_max_segs = gso_max_segs;
 	netif_set_gso_max_size(bond_dev, gso_max_size);