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Date:      Sun, 05 May 2013 22:07:40 -0500
From:      Pedro Giffuni <pfg@FreeBSD.org>
To:        "Kenneth D. Merry" <ken@freebsd.org>
Cc:        freebsd-scsi@freebsd.org
Subject:   Re: Reference documentation for a scsi DTrace provider.
Message-ID:  <51871E7C.90108@FreeBSD.org>
In-Reply-To: <20130506022652.GA49892@nargothrond.kdm.org>
References:  <51870B8F.5040306@FreeBSD.org> <20130506022652.GA49892@nargothrond.kdm.org>

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El 05/05/2013 9:26 p. m., Kenneth D. Merry escribió:
> On Sun, May 05, 2013 at 20:46:55 -0500, Pedro Giffuni wrote:
>> Hello;
>>
>> By the way Solaris implemented some DTrace providers it looks like we
>> need a scsi provider as a starting point for a iscsi provider, which in
>> turn (plus the IP provider) is also a requirement to get NFSv4/NFSv3
>> providers.
>
> Why do the NFS providers depend on an iSCSI provider?
>
That's a good question.

According to the NFSv3 provider documentation:

https://wikis.oracle.com/display/DTrace/nfsv3+Provider
____

All NFS operation probes have the first argument in common:

args[0]		conninfo_t *		socket connection information

The conninfo_t structure is already used by the iSCSI target provider 
(iscsi) and the NFS v4 provider (nfsv4), and is intended for use by all 
provider which are providing some higher level protocol (e.g. iscsi, 
nfs, http, ftp).
_____


Regards,

Pedro.

>> I suspect there may be some interest on having a scsi DTrace provider
>> for it's own purposes, so JIC someone wants to try and at least for
>> documentation purposes I will share some links I found on how it was
>> done for OpenSolaris.
>>
>> The original commit in OpenSolaris seems to have been this:
>>
>> https://bitbucket.org/illumos/illumos-gate/commits/c4b38ec17f4eaacad8868141411d7b513910ad4a
>>
>> Then there is an interesting blog posting that accompanies it:
>>
>> "Adding a Dtrace provider to the kernel"
>> https://blogs.oracle.com/chrisg/entry/adding_a_dtrace_provider_to
>>
>> And some general introductory documentation for reference:
>>
>> http://www.ibm.com/developerworks/aix/library/au-dtraceprobes.html
>>
>> https://wiki.freebsd.org/DTrace/HowToAddSDTProbes
>>
>> Hope someone finds this helpful,
>
> It is, thanks!
>
> It would be great to have a SCSI provider, and an iSCSI provider to go
> along with the iSCSI work that Edward Napierala <trasz@freebsd.org> is
> doing.
>
> I don't have the time, but perhaps someone else will.
>
> Ken
>




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