IPoIB: Add LSO support

For HCAs that support TCP segmentation offload (IB_DEVICE_UD_TSO), set
NETIF_F_TSO and use HW LSO to offload TCP segmentation.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index edf63dc0afe0..9d411f21460e 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -1384,7 +1384,7 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
                 ipoib_warn(priv, "enabling connected mode "
                            "will cause multicast packet drops\n");
 
-                dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG);
+                dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 
                 ipoib_flush_paths(dev);
@@ -1396,8 +1396,11 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
                 dev->mtu = min(priv->mcast_mtu, dev->mtu);
                 ipoib_flush_paths(dev);
 
-                if (test_bit(IPOIB_FLAG_CSUM, &priv->flags))
+                if (test_bit(IPOIB_FLAG_CSUM, &priv->flags)) {
                         dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
+                        if (priv->hca_caps & IB_DEVICE_UD_TSO)
+                                dev->features |= NETIF_F_TSO;
+                }
 
                 return count;
         }