IPOIB_UD_RX_SG
u64 mapping[IPOIB_UD_RX_SG];
struct ib_sge rx_sge[IPOIB_UD_RX_SG];
u64 mapping[IPOIB_UD_RX_SG];
IPOIB_UD_RX_SG * sizeof(*mapping));
u64 mapping[IPOIB_UD_RX_SG])
.max_recv_sge = IPOIB_UD_RX_SG