Or Gerlitz pointed out that the ipath driver wasn't setting IB_DEVICE_RC_RNR_NAK_GEN. When I looked at the other flags to see if any others were missing, I wasn't sure what one of the flags means. Can someone enlighten me? IB_DEVICE_CURR_QP_STATE_MOD ib_modify_qp(IB_QP_CUR_STATE) supported?