Date: Wed, 7 Jan 2004 09:20:02 -0800 From: Chuck Tuffli <chuck_tuffli@agilent.com> To: Chhavi Kansal <chhavi_kansal@yahoo.com> Cc: freebsd-scsi@freebsd.org Subject: Re: scsi_target driver on FreeBSD 4.7 Message-ID: <20040107172002.GD9945@cre85086tuf.rose.agilent.com> In-Reply-To: <20040107161605.95908.qmail@web21501.mail.yahoo.com> References: <20040107161605.95908.qmail@web21501.mail.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Jan 07, 2004 at 08:16:05AM -0800, Chhavi Kansal wrote: > Hi all, > I want to write a scsi target driver to send some vendor > specific commands to the scsi disk. For that I have modified the Uh, who is sending the commands? Is the initiator sending a vendor specific command that the target driver passes along to the disk? Or, is the CAM/SIM driver receiving a command and translating it into a vendor specific command? Can you describe your setup a little bit more? > scsi_target.c. But it doesn't seems to be loading properly. I've > given printf's to all the functions. But it doesn't printing the > printf for init() function itself. Which HBA are you using (QLogic, ...)? Is the backing store the SCSI Disk Emulator (share/examples/scsi_target) or something else? > Do you have any idea, if I need to add anything in the existing > scsi_target.c available in sys/cam/scsi dir. > > How can we register a scsi driver module to the cam interface. It looks very similar to the initiator case that is documented (i.e. xpt_bus_register()). One difference is that the driver needs to set the target_sprt variable in the ccb->cpi structure. See the isp(4) driver for an example. > Is there any document where I can look to the flow of the driver calls. ? Use the code ;) I'm not 100% sure on this, but my understanding is that the disk emulator tells the CAM target driver how many IO's it can handle by allocating and sending ccb_accept_tio structures to the driver via write(). Once the SIM driver receives a CDB, it copies the CDB info to one of the ATIO structures and completes the command with xpt_done(). > Any pointer would be of great help ... > > regards, > Chhavi > > > > --------------------------------- > Do you Yahoo!? > Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes > _______________________________________________ > freebsd-scsi@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-scsi > To unsubscribe, send any mail to "freebsd-scsi-unsubscribe@freebsd.org" -- Chuck Tuffli <chuck_tuffli AT NO_SPAM agilent DOT com> Agilent Technologies, Storage Area Networking
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040107172002.GD9945>