FUJITA Tomonori wrote on 2006-08-26: > From: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx> ... >> Could someone of the SCSI target folks give a rough outline of a SCSI >> target's building blocks when using this framework? > > Our OLS's paper and slides have good pictures. > > http://stgt.berlios.de/ > > I guess that SBP target stuff works well with the target > framework. All you need to do is to take care of SBP protocol. The > framework does the rest, that is, SCSI protocol processing, I/O, > logical unit management, configuration, etc. > > For example, your driver receives a SCSI command from an initiator, > tell the framework to perform it. Then the framework sends back the > result and buffer containing data you send to the initiator if > necessary. This looks very comfortable to write a transport driver against. > I don't know where your driver is implemented, in kernel space or user > space. Hani Mustafa's unpublished target is in kernel, Manish Singh's in userspace (as a libraw1394 application via the raw1394 character device; AFAIU multiple initiators capable, currently single-LU and only RBC implemented). >From end-user perspective, userspace might be preferable. I don't know though what the performance implications are and how easy e.g. optical drives could be integrated one or the other way. However, choices are good. (Besides and off topic, an SBP-2 target implementation in BIOS would be useful, like in Apple's firmware of their desktops and portables.) > The framework was designed for the former, however, it works > with both models now. You can find an example of the latter (though > it's just experiment): > > svn co http://svn.berlios.de/svnroot/repos/stgt/branches/user-iscsi > > > BTW, we've prepared a new git tree: > > http://www.kernel.org/git/?p=linux/kernel/git/mnc/linux-2.6-target.git;a=summary Thanks for the explanation and links. BTW, why not write the source file names out as _target_ instead of _tgt_? I hear git supports file renaming... :-) -- Stefan Richter -=====-=-==- =--= --=-- http://arcgraph.de/sr/ -- VGER BF report: H 4.53233e-10 - 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
