ipoib_cm_skb_too_long
void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);