Kernel Functions for Drivers
                          usbpipegetmaxbulktransfersize(9F)



NAME
     usbpipegetmaxbulktransfersize  -  Get   maximum   bulk
     transfer size

SYNOPSIS
     #include 



     int usbpipegetmaxbulktransfersize(devinfot dip, sizet *size);


INTERFACE LEVEL
     Solaris DI specific (Solaris DI)

PARAMETERS
     dip     Pointer to the device's devinfo structure.


     size    Returns the bulk transfer size.


DESCRIPTION
     The usbpipegetmaxbulktransfersize()  function  returns
     the  maximum  data transfer size in bytes that the host con-
     troller driver can support per bulk request.  This  informa-
     tion  can  be used to limit or break down larger requests to
     manageable sizes.

RETURN VALUES
     USBSUCES         Size is returned in size argument.


     USBINVALIDARGS    dip and/or size argument is NUL.


     USBFAILURE         Size could  not  be  returned.  Zero  is
                         returned in size arg.


CONTEXT
     May be called from user, kernel or interrupt context.

EXAMPLES
           int xxxattach(devinfot *dip, int command)
           {
                  ...
                  usbpipegetmaxbulktransfersize(dip, &state>maxxfersize);
                  ...
           }




SunOS 5.11           Last change: 5 Jan 2004                    1






Kernel Functions for Drivers
                          usbpipegetmaxbulktransfersize(9F)



           void xxxminphys(struct buf bp)
           {
                  ...
                  if (bp->bbcount > state->maxxfersize) {
                          bp->bbcount = state->maxxfersize;
                  }
                  ...
           }




ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Architecture                 PCI-based systems           
    
     Interface stability          Committed                   
    
     Availability                 SUNWusb                     
    


SEE ALSO
     attributes(5),                       usbpipebulkxfer(9F),
     usballocrequest(9F), usbbulkrequest(9S)






















SunOS 5.11           Last change: 5 Jan 2004                    2






Kernel Functions for Drivers
                          usbpipegetmaxbulktransfersize(9F)






















































SunOS 5.11           Last change: 5 Jan 2004                    3