func (qp *queuePair) Init() error {
attr := C.struct_ibv_qp_attr{}
attr.qp_state = C.IBV_QPS_INIT
attr.pkey_index = 0
attr.port_num = C.uint8_t(qp.port)
// allow RDMA write
attr.qp_access_flags = IBV_ACCESS_REMOTE_WRITE
mask := C.IBV_QP_STATE | C.IBV_QP_PKEY_INDEX | C.IBV_QP_PORT | C.IBV_QP_ACCESS_FLAGS
return qp.modify(&attr, mask)
}
func (qp *queuePair) ReadyToSend() error {
attr := C.struct_ibv_qp_attr{}
attr.qp_state = C.IBV_QPS_RTS
// Local ack timeout for primary path.
// Timeout is calculated as 4.096e-6*(2**attr.timeout) seconds.
attr.timeout = 14
// Retry count (7 means forever)
attr.retry_cnt = 6
// RNR retry (7 means forever)
attr.rnr_retry = 6
attr.sq_psn = C.uint32_t(qp.psn)
// this must be > 0 to avoid IBV_WC_REM_INV_REQ_ERR
attr.max_rd_atomic = 1
mask := C.IBV_QP_STATE | C.IBV_QP_TIMEOUT | C.IBV_QP_RETRY_CNT | C.IBV_QP_RNR_RETRY |
C.IBV_QP_SQ_PSN | C.IBV_QP_MAX_QP_RD_ATOMIC
return qp.modify(&attr, mask)
}
func (qp *queuePair) ReadyToReceive(destLid uint16, destQpn, destPsn uint32) error {
attr := C.struct_ibv_qp_attr{}
attr.qp_state = C.IBV_QPS_RTR
attr.path_mtu = C.IBV_MTU_2048
attr.dest_qp_num = C.uint32_t(destQpn)
attr.rq_psn = C.uint32_t(destPsn)
// this must be > 0 to avoid IBV_WC_REM_INV_REQ_ERR
attr.max_dest_rd_atomic = 1
// Minimum RNR NAK timer (range 0..31)
attr.min_rnr_timer = 26
attr.ah_attr.is_global = 0
attr.ah_attr.dlid = C.uint16_t(destLid)
attr.ah_attr.sl = 0
attr.ah_attr.src_path_bits = 0
attr.ah_attr.port_num = C.uint8_t(qp.port)
mask := C.IBV_QP_STATE | C.IBV_QP_AV | C.IBV_QP_PATH_MTU | C.IBV_QP_DEST_QPN |
C.IBV_QP_RQ_PSN | C.IBV_QP_MAX_DEST_RD_ATOMIC | C.IBV_QP_MIN_RNR_TIMER
return qp.modify(&attr, mask)
}
func (qp *queuePair) Error() error {
attr := C.struct_ibv_qp_attr{}
attr.qp_state = C.IBV_QPS_ERR
mask := C.IBV_QP_STATE
return qp.modify(&attr, mask)
}