MLX4_IB_MIN_SQ_STRIDE
ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE)
qp->sq.wqe_shift = MLX4_IB_MIN_SQ_STRIDE;
qp->buf_size = qp->sq.wqe_cnt << MLX4_IB_MIN_SQ_STRIDE;
qp->sq.wqe_shift = MLX4_IB_MIN_SQ_STRIDE;