Hi, Thanks for the reply. That made a lot of sense. I think I have the general idea, however I'm having some problems. I've managed to use ioctl() to send a vendor specific command using an ATA_PASS_THROUGH 12 or 16byte CDB to the device, and ioctl() returns success, and the various status,info flags are all OK too. However, when I look at CATC traces of the transfer, I notice that the CONTROL byte is always 0x8. This is regardless of what value I set my CDB's CONTROL byte field to, and regardless of whether I use the 12 or 16byte CDB. I've read the SCSI architecture model-3 document, and 0x8 isn't even a valid value for the CONTROL byte. It's a reserved bit that's being set. Why would the CONTROL byte not be what I set it as? I checked the value of the byte in my code before and after I do the ioctl() and the value does not change, so why would it be set as 0x8 instead of what I set it as in my code? Thanks. On Tue, Dec 2, 2008 at 8:29 PM, <bburk@xxxxxxxxxxxxxxxxxxx> wrote: > http://www.t10.org/cgi-bin/ac.pl?t=f&f=sat-r09.pdf > > Go to Section 12 and read up on the passthrough. > > The SCSI ioctl that you need to use is SG_IO. Google that for info on how > to set up the ioctl. The command can be sent to either sd or sg devices > these days. You'll also need to make sure that libata is loaded as a module > I think. > > Note that not all adapters will support the ATA_PASSTHROUGH scsi commands. > They should, but they don't. > > Brent Burkholder > ExtremeProtocol.com > > > > > -------- Original Message -------- > Subject: Linux SCSI programming > From: "Sihan Goi" <goister@xxxxxxxxx> > Date: Mon, December 01, 2008 8:50 pm > To: linux-scsi@xxxxxxxxxxxxxxx > > Hi, > > I'm trying to port a Windows SCSI API over to Linux. The API has > several functions, most of them using ATA_PASS_THROUGH_EX to send a > vendor specific command over to the device. I've managed to port 1 of > the API function that is a modified INQUIRY command. However, I'm very > confused as to how ATA passthrough is done in Linux. I've looked at > the sg3_utils source code to get some inspiration but it's too > complicated for me to understand what's going on. > > Does anyone know how to port this? > > In Windows a ATA_PASS_THROUGH_EX pointer is declared and memory > allocated for it. It's fields are then initialized(Length, AtaFlags, > DataTransferLength, TimeOutValue, DataBufferOffset, CurrentTaskFile[], > PreviousTaskFile[], etc) and then a DeviceIoControl() is called. > > Now I know Linux's version of DeviceIoControl is ioctl() and I've used > it successfully for the INQUIRY command, but what's Linux's version of > ATA_PASS_THROUGH_EX? > > Any help would be appreciated. Thanks! > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- - Goi Sihan goister@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
