[openib-general] SA cache design

[Hal Rosenstock]

On Thu, 2006-01-05 at 18:24, Sean Hefty wrote:
> >For the precise language, see C15-0-1.24 p. 923 IBA 1.2:
> >
> >
> >C15-0.1.24: It shall be possible to determine the location of SA from
> >any
> >endport by sending a GMP to QP1 (the GSI) of the node identified by the
> >endport's PortInfo:MasterSMLID, using in the GMP the base LID of the
> >endport as the SLID, the endport's PortInfo:MasterSMSL as the SL, the
> >well-known Q_Key (0x8001_0000), and whichever of the default P_Keys
> >(0xFFFF or 0x7FFF) was placed in the endport's P_Key Table by the SM
> >(Table 183 Initialization on page 868).
> >
> >so I overstated it a bit but this needs to be obeyed.
> 
> Could each of the requests be redirected to different nodes?

Yes.

>   I can envision how
> the sa_cache could eventually build towards a distributed SA.

I think a distributed SA is more like it rather than an SA cache.

-- Hal

> >C15-0.1.25: A SubnAdmGet(ClassPortInfo) sent according to C15-
> >0.1.24: shall return all information needed to communicate with Subnet
> >Administration. Alternatively, valid GMPs for SA sent according to C15-
> >0.1.24: shall either return redirection responses providing all such
> >information, or shall be normally processed by SA.
> 
> Thanks for the references.
> 
> - Sean
>