Passing URL report parameters directly to a report in a SharePoint Document Library is enabled in the SQL Server Reporting Services 2008 Integration with SharePoint Add-in.

Why? Key intent is to allow specifying non-default report parameter values when rendering of a report in full-page view in SharePoint.  

How do you use this feature? Simply add-on the URL report parameters onto the URL displayed in SharePoint when viewing a report in full page view. 

• When a report is rendered in full-page view in SharePoint, the URL is displayed in the following format: http://<SharePoint_site>/_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/<SharePoint_Document_Library>/<Report_Name>.rdl.
• In SSRS 2008, you specify a report parameter name and value pair by explicitly specifying the prefix "rp:". Here is an example to add-on a parameter with name "Month" that accepts a string value: http://<SharePoint_site>/_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/<SharePoint_Document_Library>/<Report_Name>.rdl&rp:Month=January
• You can also specify a fixed set of ReportViewer parameters to alter full-page rendering experience. These ReportViewer parameters need to be explicitly prefixed by "rv:". Here is an example of rendering the report with the parameters area collapsed: http://<SharePoint_site>/_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/<SharePoint_Document_Library>/<Report_Name>.rdl&rv:ParamMode=Collapsed&rp:Month=January

Examples: Here are examples using the Adventureworks sample reports assumed to be stored in SharePoint document library: http://<SharePoint_site>/Reports/ReportsLibrary

·         Render the AdventureWorks "Employee Sales Summary" report for 'Syed Abbas' for 'January' / '2004' with ReportViewer Toolbar showing pagination only: http://<SharePoint_site>/Reports/_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/Reports/ReportsLibrary/Employee%20Sales%20Summary.rdl&rv:ToolBar=Navigation&rp:EmpID=288&rp:ReportMonth=1&rp:ReportYear=2004

·         Render the AdventureWorks 'Product Catalog' report with the Document Map Area collapsed and no Header Area: http://<SharePoint_site>/Reports/_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/Reports/ReportsLibrary/Product%20Catalog.rdl&rv:HeaderArea=None&rv:DocMapMode=Collapsed

ReportViewer parameters for controlling full-page report rendering