Re : iscsi: Flavours of Login

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

> Matthew,
>
> Some comments inline within the table.

> Regards,
> Santosh
>
> "BURBRIDGE,MATTHEW (HP-UnitedKingdom,ex2)" wrote:
>
> >
> > Flavours of Login:
> > +-------+-------+-------+---+-------------------------------------------+
> > | TSID  | ISID  | CID   | X | Description                               |
> > +-------+-------+-------+---+-------------------------------------------+
> > |   0   | New   | New   | 0 | Initiator is creating a new session.      |
> > +-------+-------+-------+---+-------------------------------------------+
>
> Agreed. (Note that in this case, the CID is really a don't care, since CID is
> always new when a login on a new ISID is received.)
>
> > |   0   | Exist | New   | 0 | Initiator is trying to login after reboot |
> > +-------+-------+-------+---+-------------------------------------------+
>
> The first qualifier of a login should be the (ISID, TSID). If a session exists
> for the given (initiator name + ISID) pair and TSID is set to 0, then, the
> target MUST consider this login as an implicit logout of the previous session
> and then a re-login. In this case, the CID or X bit must be a "don't care".
> (?).
>
> > | Exist | Exist | New   | 0 | Initiator is adding a new connection to   |
> > |       |       |       |   | an existing session.                      |
> > +-------+-------+-------+---+-------------------------------------------+
>
> Agreed.
>
> > | Exist | Exist | Exist | 1 | Initiator is attempted connection         |
> > |       |       |       |   | reinstatement                             |
>
> Agreed.
>
> > +-------+-------+-------+---+-------------------------------------------+
> > | Exist | Exist | New   | 1 | Initiator is attempting session recovery  |
> > |       |       |       |   | (Proposal A)                              |
>

> The above is an invalid login PDU. An existing (ISID, TSID) login MUST either
> use :
> a) an existing CID with the X bit set
> b) or, a new CID while adding a cxn to a session.
>
> > +-------+-------+-------+---+-------------------------------------------+
> > |   0   | Exist | New   | 1 | Initiator is attempting session recovery  |
> > |       |       |       |   | (Proposal B)                              |
> > +-------+-------+-------+---+-------------------------------------------+
>
> As stated earlier, for a given (initiator name + ISID), if the TSID is 0, the
> login is an implicit logout + re-login if a previous session exists, for that
> (initiator name + ISID). In this case, the CID and X_bit are "don't cares".
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