Date: Wed, 4 Jun 2003 23:41:57 -0700 (PDT) From: Nate Lawson <nate@root.org> To: Aniruddha Bohra <bohra@cs.rutgers.edu> Cc: freebsd-scsi@FreeBSD.org Subject: Re: Emulating a SCSI device Message-ID: <20030604233659.V26654@root.org> In-Reply-To: <3EDD1302.6090102@cs.rutgers.edu> References: <3ED3CCFF.4080507@cs.rutgers.edu> <20030602235514.J22029@root.org> <3EDD1302.6090102@cs.rutgers.edu>
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On Tue, 3 Jun 2003, Aniruddha Bohra wrote: > Nate Lawson wrote: > >On Tue, 27 May 2003, Aniruddha Bohra wrote: > >> I am trying to write a SIM module for FreeBSD which basically > >>emulates a SCSI controller with a disk attached at target 0 lun 0. > > > >What is your hardware? Are you using sys/cam/scsi/scsi_target and > >src/share/examples/scsi_target? > > There is a LSI logic(mpt) SCSI controller in the system. However that is > immaterial as > I am trying to get a large memory buffer to act as a disk. > I would emulate a SCSI controller, so will handle the low level SCSI > commands myself by accessing the > memory. > > I will look at the above. I still am unclear about what you are trying to do. Are you trying to emulate an HBA? In that case, just take isp(4) or ahc(4) and strip things down to *_attach() and *_action(). > >> I go as far as the action function of the controller getting called > >>with a XPT_PATH_INQ - where I fill in the fake data. Which controller do you mean? You said above the controller is not relevant. > >> Nothing happens after that. I have looked for documentation > >>of how to get the psuedo disk attached to the da driver but did > >>not make much headway. > > > >You have to call xpt_done() on the CCB to send it back to the caller. > > I do that - Is there something special that I need to write in the ccb > header so that the caller > identifies the "device" as a disk ? Let's start over with you explaining what you are trying to do and I can give you an answer. -Nate
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