IB_GRH_BYTES
(grh_present ? IB_GRH_BYTES : 0) +
len += IB_GRH_BYTES;
#define IPOIB_UD_BUF_SIZE(ib_mtu) (ib_mtu + IB_GRH_BYTES)
IPOIB_UD_HEAD_SIZE = IB_GRH_BYTES + IPOIB_ENCAP_LEN,
skb_pull(skb, IB_GRH_BYTES);
mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES +