Re: iscsi Rev 7.93 : text cmd & bookmarks.

[Santosh Rao <santoshr@cup.hp.com>]

Having a TTT allows the lookup of text cmd/responses to be the same as any
other cmd/rsp lookup. i.e. there is no need to special case the lookup of a
text cmd/rsp.

There will be only 1 outstanding text cmd/rsp in progress at any given time.
However, other cmds/rsps can continue in parallel with text cmd/rsp. Thus,
usage of a standard task lookup scheme like the task tags allows one to avoid
having to special case the context lookup based on cmd/rsp opcode.

- Santosh


Ayman Ghanem wrote:

> I could be missing something, but I am not sure why do we have TTT in text
> cmd/rsp if there MUST be only one outstanding text cmd per connection. Text
> command lookup implies to me more than one outstanding cmd, but that would
> be a protocol error.
>
> -Ayman
>
> > -----Original Message-----
> > From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of
> > Santosh Rao
> > Sent: Monday, September 17, 2001 1:26 PM
> > To: IPS Reflector
> > Subject: iscsi Rev 7.93 : text cmd & bookmarks.
> >
> >
> > Hi Julian,
> >
> > Thanks for adding the target transfer tag field to the text command
> > & text response. This allows for simpler indexing for targets without
> > having to special case the text message lookups.
> >
> > Also, as you've observed and incorporated, the target transfer tag field
> > itself serves as a bookmark and so, the bookmark field has been removed.
> >
> > One question remains however. Since the target transfer tag field serves
> > as a bookmark and a TTT of 0xFFFFFFFF serves as an indication that this
> > is a new text command (i.e. no bookmark present), of what value add is
> > the bookmark bit ? Why not remove the bookmark bit itself and only use
> > the TTT ?
> >
> > Keeping both the bookmark bit and the TTT is providing 2 ways of
> > indicating a new text cmd. I would be in favor of removal of the
> > bookmark bit.
> >
> > Regards,
> > Santosh
> >
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