IB/ipoib: Set MTU to max allowed by mode when mode changes

When switching between modes (datagram / connected) change the MTU
accordingly.
datagram mode up to 4K, connected mode up to (64K - 0x10).

Signed-off-by: ELi Cohen <eli@mellanox.com>
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 59604a7..b2943c8 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -232,6 +232,7 @@ int ipoib_set_mode(struct net_device *dev, const char *buf)
                ipoib_warn(priv, "enabling connected mode "
                           "will cause multicast packet drops\n");
                netdev_update_features(dev);
+               dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
                rtnl_unlock();
                priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;