IOCINFO for SAS Adapters

By knowing the maximum data transfer size, a SAS device driver can control several different devices on several different adapters. This operation returns a devinfo structure as defined in the sys/devinfo.h header file with the DD_BUS device type and the DS_SAS subtype. The following example shows a call to obtain the information:

rc = fp_ioctl(fp, IOCINFO, &infostruct, NULL);

where the fp parameter points to a file structure and the infostruct parameter is a devinfo structure. A nonzero rc value indicates an error. The devinfo structure is a union of several structures and the sas structure applies to the adapter. For example, the maximum transfer-size value is contained in the infostruct.un.sas.max_transfer variable.