[openib-general] SM assigned GID addresses

[Batwara, Ashish]

Thanks for your reply.
So do you mean to say that current GUIDCap is always configured by SM to
1 for all the HCAs, and it is safe to assume that one IB port will have
only one or multiple IB address but that will have GUID portion common
in them (Based upon manufacturer's assigned EUI-64 based).
We are trying to define the target functionality for IB for our storage
arrays, and are trying to explore howmany port addresses that we can get
from an initiator standpoint.
How does this IB port GUID maps to SRP initiator ID? Are they same or
I/O Controller may have its own GUID and can use SM prefix to derive
initiator port ID in SRP login req?

Thanks
Ashish

-----Original Message-----
From: Hal Rosenstock [mailto:halr at voltaire.com] 
Sent: Wednesday, February 14, 2007 10:41 AM
To: Batwara, Ashish
Cc: openib-general at openib.org
Subject: Re: [openib-general] SM assigned GID addresses

Hi,

On Wed, 2007-02-14 at 11:12, Batwara, Ashish wrote:
> Hi,
> I am referring to Section 4.1.1 of IB Spec which talks about "GID
Usage
> AND Properties". Does anyone know whether or not SM uses item # 3
below
> for the address assignment and who are all the vendor supports # 3?

> Can anybody points me to the appropriate driver documentation in this
area?

OpenSM supports setting either the default GID prefix or a configured
GID prefix and GIDs are comprised of this prefix and the endport EUI-64
(at index 0 of GUIDInfo).

OpenSM does not currently support configuring GUIDInfo indices above 0.
I'm also not sure how the stack would deal with this either. Is this a
requirement for some reason ? If so, can you elaborate/explain ?

-- Hal

> Thanks
> Ashish
> 
> 
> GID USAGE AND PROPERTIES
> 1) Each endport shall be assigned at least one unicast GID. The first
> unicast GID assigned shall be created using the manufacturer assigned
> EUI-64 identifier. This GID is referred to as GID index 0 and is
> formed by techniques 3(a) and 3(b) described below.
> 2) The default GID prefix shall be (0xFE80::0). A packet using the
> default
> GID prefix and either a manufacturer assigned or SM assigned
> EUI-64 must always be accepted by an endnode. A packet containing
> a GRH with a destination GID with this prefix must never be
> forwarded by a router, i.e. it is restricted to the local subnet.
> 3) A unicast GID shall be created using one or more of the following
> mechanisms:
> a) Concatenation of the default GID prefix with the manufacturer
> assigned
> EUI-64 identifier associated with an endport. This GID is
> referred to as the default GID.
> b) Concatenation of a subnet manager assigned 64-bit GID prefix
> and the manufacturer assigned EUI-64 identifier associated with
> an endport.
> c) Assignment of a GID by the subnet manager. The subnet manager
> creates a GID by concatenating the GID prefix (default or assigned)
> with a set of locally assigned EUI-64 values (at GID index
> 1 or above). Each endport must be assigned at least one unicast GID
> using (a). Additional GIDs may be assigned using (b) and/or (c). Note:
A
> subnet
> shall only have one assigned GID prefix (non default) at any given
> time.
> 
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