net: bonding: Inherit MPLS features from slave devices

When setting the bonding interface net device features,
the kernel code doesn't address the slaves' MPLS features
and doesn't inherit them.

Therefore, HW offloads that enhance performance such as
checksumming and TSO are disabled for MPLS tagged traffic
flowing via the bonding interface.

The patch add the inheritance of the MPLS features from the
slave devices with a similar logic to setting the bonding device's
VLAN and encapsulation features.

CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Ariel Levkovich <lariel@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 407f4095a37a9d56a4615dac03c6e5efbd53ffb7..ad53e5f729906c2d708690564e57af0f4484a5d8 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1077,12 +1077,16 @@ 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;
@@ -1093,6 +1097,7 @@ 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,
@@ -1101,6 +1106,11 @@ 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;
@@ -1114,6 +1124,7 @@ static void bond_compute_features(struct bonding *bond)
        bond_dev->vlan_features = vlan_features;
        bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
                                    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);