Resources for SCSI, SRP, Infiniband?

Resources for SCSI, SRP, Infiniband?

[Michael Heinz]

Hello, all -

I'm tasked with developing a new SCSI driver for 2.4; but I'm running 
into issues that (a) SCSI drivers are different from other Linux device 
drivers and (b) none of the SCSI driver docs/how-tos seem to have been 
updated since 2.0.x.

I'm making progress, but could someone direct me to a list of do's and 
don't's for SCSI drivers in 2.4?

Also, anybody else looking at developing IB and or SRP?

Thanks a lot....

Re: Resources for SCSI, SRP, Infiniband?

[Pete Zaitcev]

> I'm making progress, but could someone direct me to a list of do's and 
> don't's for SCSI drivers in 2.4?

Laugh, sadly.

> Also, anybody else looking at developing IB and or SRP?

Nobody does IB in the open, because hardware is not generally
available. Adapter manufacturers roll their proprietary stacks.
I work in a Trillian style effort (e.g. definitely to be opensourced
at a later date) - contact johnsonm at redhat if you are interested
in joining.

No SRP implementations exist that I know of, prorotypes may
be out there, coming from storage startups. AFAIK, Intel is
using a packetised SCSI mapping, at least Ashok Raj made
noises about it on IDF.

-- Pete

RE: Resources for SCSI, SRP, Infiniband?

[Heinz, Michael]

Thanks, Pete.


That's kind of the impression I was forming - nothing public for IB,
everything under the covers. Kind of silly, in the long run. 

As for the SCSI - thanks, at least I know I won't be breaking any rules
(since there aren't any... ;->)


Everybody loves a clown, but nobody will lend him money.

Michael "Pork Chop" Heinz
Infinicon Systems
610-205-0457 

-----Original Message-----
From: Pete Zaitcev [mailto:zaitcev@redhat.com]
Sent: Monday, August 06, 2001 4:14 PM
To: Heinz, Michael; linux-kernel
Subject: Re: Resources for SCSI, SRP, Infiniband?


> I'm making progress, but could someone direct me to a list of do's and

> don't's for SCSI drivers in 2.4?

Laugh, sadly.

> Also, anybody else looking at developing IB and or SRP?

Nobody does IB in the open, because hardware is not generally
available. Adapter manufacturers roll their proprietary stacks.
I work in a Trillian style effort (e.g. definitely to be opensourced
at a later date) - contact johnsonm at redhat if you are interested
in joining.

No SRP implementations exist that I know of, prorotypes may
be out there, coming from storage startups. AFAIK, Intel is
using a packetised SCSI mapping, at least Ashok Raj made
noises about it on IDF.

-- Pete

Re: Resources for SCSI, SRP, Infiniband?

[Douglas Gilbert]

Michael Heinz <mheinz@infiniconsys.com> wrote:
> I'm tasked with developing a new SCSI driver for 2.4; 
> but I'm running into issues that (a) SCSI drivers 
> are different from other Linux device drivers and 
> (b) none of the SCSI driver docs/how-tos seem to have
> been updated since 2.0.x.

Strange, I'm pretty certain the linux documentation
project now includes my document:
  http://www.linuxdoc.org/HOWTO/SCSI-2.4-HOWTO
and has for the last 6 months.

> I'm making progress, but could someone direct me to 
> a list of do's and don't's for SCSI drivers in 2.4?

Have you looked at Eric Youngdales site:
  http://www.andante.org/scsi.html  ?

Alan Cox wrote an article about developing a SCSI driver
(but its a little out of date). Then there are the
maintainers of the existings scsi adapter drivers
who may lend you a hand. Best to address your general
scsi queries to the linux-scsi@vger.kernel.org

> Also, anybody else looking at developing IB and or SRP?

I went to an IB talk at the OLS and it seems that most
players don't want to say much; so much for open
software.

Doug Gilbert

Re: Resources for SCSI, SRP, Infiniband?

[Matthew Jacob]

> 
> > Also, anybody else looking at developing IB and or SRP?
> 
> I went to an IB talk at the OLS and it seems that most
> players don't want to say much; so much for open
> software.
> 

pfiffle. The software and standards are open. The hardware players aren't
yet. This should put to rest any foolish notions about the relative importance
of some things.

RE: Resources for SCSI, SRP, Infiniband?

[Heinz, Michael]

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> Strange, I'm pretty certain the linux documentation
> project now includes my document:
>   http://www.linuxdoc.org/HOWTO/SCSI-2.4-HOWTO
> and has for the last 6 months.

Doug, you're a life saver. 

For some reason, if you go to LinuxDoc and search (as I did) for "SCSI",
the first 33 entries all refer to the 1996 version of this document! It
didn't occur to me that they would have both the old and new versions on
line.


> Have you looked at Eric Youngdales site:
>   http://www.andante.org/scsi.html  ?
> 
> Alan Cox wrote an article about developing a SCSI driver
.
.
.
> who may lend you a hand. Best to address your general
> scsi queries to the linux-scsi@vger.kernel.org

Again, thanks for the tips! While I'm an old hand at UNIX (and at
various freeware projects) I'm quite new to the Linux environment.

> I went to an IB talk at the OLS and it seems that most
> players don't want to say much; so much for open
> software.

Yeah, that seems to be my experience. 

Thanks again.

--
"Oh, bother!" said the Borg. "We've assimilated Pooh!"
"Thanks for noticing." replied Eeyore.

mheinz@infiniconsys.com


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Re: Resources for SCSI, SRP, Infiniband?

[Oliver Xymoron]

On Mon, 6 Aug 2001, Michael Heinz wrote:

> I'm tasked with developing a new SCSI driver for 2.4; but I'm running
> into issues that (a) SCSI drivers are different from other Linux device
> drivers and (b) none of the SCSI driver docs/how-tos seem to have been
> updated since 2.0.x.
>
> I'm making progress, but could someone direct me to a list of do's and
> don't's for SCSI drivers in 2.4?
>
> Also, anybody else looking at developing IB and or SRP?

The mention of all of the above together suggests you're working on iSCSI
or something similar. If so, there are at least three open implementations
for Linux, from Cisco, Intel, and UNH. Are you looking for Secure Remote
Password (speced for iSCSI authentication) or Selective Retransmission
Protocol?

--
 "Love the dolphins," she advised him. "Write by W.A.S.T.E.."

Re: Resources for SCSI, SRP, Infiniband?

[Michael Heinz]

Oliver Xymoron wrote:

> The mention of all of the above together suggests you're working on iSCSI
> or something similar. If so, there are at least three open implementations
> for Linux, from Cisco, Intel, and UNH. Are you looking for Secure Remote
> Password (speced for iSCSI authentication) or Selective Retransmission
> Protocol?
> 
> --
>  "Love the dolphins," she advised him. "Write by W.A.S.T.E.."
> 
> 
Ultimately, SRP over InfiniBand. At the moment, my sights are somewhat 
lower - a working RAM disk that emulates a SCSI device. (To teach myself 
the ins and outs of the SCSI modules)

Re: Resources for SCSI, SRP, Infiniband?

[Pete Zaitcev]

> > Also, anybody else looking at developing IB and or SRP?
> 
> The mention of all of the above together suggests you're working on iSCSI
> or something similar. If so, there are at least three open implementations
> for Linux, from Cisco, Intel, and UNH. Are you looking for Secure Remote
> Password (speced for iSCSI authentication) or Selective Retransmission
> Protocol?

Too many TLAs in the storage area. SRP in the context of Infi
is SCSI RDMA Protocol (formerly known as SCSI VI Protocol
(no, it is not Roman "six", but SCSI-over-VIA)). See:
 ftp://ftp.t10.org/t10/drafts/srp/srp-r07.pdf

-- Pete