[openib-general] Re: QoS RFC

[Asgeir Eiriksson]

Roland

This thread also indirectly brings up the issue of OpenFabrics, RNIC,
and QoS.

The RNIC devices don't have to be, but are typically unified wire
devices, i.e. have simultaneous support for regular Ethernet NIC
functions such as LSO/TSO and checksum offloads; iSCSI HBA initiator
and/or target functionality; RNIC functionality; and TCP/IP offload.

All the usual Ethernet TCP/IP management and configuration tools work as
expected for such a device, e.g. for the purpose of this discussion QoS
configuration with DiffServ, etc.

At the same time: if there's an OpenFabrics QoS API, then this API needs
to be transport agnostic, such that RNIC QoS can be configured through
this same OpenFabrics QoS API.

To be clear: the QoS requirements presented in the RFC look quite
reasonable for an RNIC device, but the initial proposal didn't abstract
out non-essential (to QoS) IB detail.

Regards,

Asgeir Eiriksson
CTO
Chelsio Communications Inc.


> -----Original Message-----
> From: openib-general-bounces at openib.org [mailto:openib-general-
> bounces at openib.org] On Behalf Of Roland Dreier
> Sent: Tuesday, May 30, 2006 7:44 AM
> To: Eitan Zahavi
> Cc: Nimrod Gindi; Roland Dreier; openib-general at openib.org
> Subject: [openib-general] Re: QoS RFC
> 
>  > Service-ID:
>  > * For PathRecord: use the first 2 reserved fields whicg are 32bits
each
>  >   (component masks 0x1 and 0x2). Component mask 1 should be used to
>  > refer to the
>  >   merged Service-ID field
> 
>  > A new capability bit should describe the SM QoS support in the SA
class
>  > port
>  > info. This approach provides an easy migration path for existing
access
>  > layer
>  > and ULPs by not introducing a new attribute.
> 
> This is OK but it's sort of a pain to have to query SA ClassPortInfo
> all the time.  Do you have a plan for how to make this transparent to
> ULPs?
> 
> (BTW something in your email client is really messing up the
> formatting of your message)
> 
>  - R.
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