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When creating a child interface, copy the MTU information from the parent. Otherwise when the child's multicast join completes, the MTU will not be updated since the code does dev->mtu = min(priv->mcast_mtu, priv->admin_mtu); and priv->admin_mtu will be set to 0. Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>