[ofa-general] QoS RFC

[Hal Rosenstock]

On 7/27/07, Sean Hefty <mshefty at ichips.intel.com> wrote:
> > I think the RDMA CM needs two solutions, depending on which address
> > family is used.  For IPv6, the existing interface is sufficient, and
> > works for both IB and iWarp.  The RDMA CM only needs to include the TC
> > and FL as part of its PR query.  For IPv4, to remain transport neutral,
> > I think we should add an rdma_set_option() routine to specify the QoS
> > field.  The RDMA CM would include the QoS field for PR query under this
> > condition.
> >
> > For IB, this requires changes to the ib_sa to support the new PR
> > extensions.  I don't think we gain anything having the RDMA CM include
> > service IDs as part of the query.
>
> I overlooked multicast in my reply.  Unfortunately, the QoS field was
> not added to MCMemberRecord.

Good point.

You can make PR requests with MGID as DGID though.

-- Hal

>  For multicast, IPv6 addresses would still
> use the TC and FL provided by the user.  For IPv4, the RDMA CM will
> either need to match the TC and FL of the IPoIB broadcast group or leave
> these fields unspecified.
>
> - Sean
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