[ofa-general] [PATCH RFC] RDMA: New Memory Extensions.

[Talpey, Thomas]

At 07:54 PM 5/14/2008, Roland Dreier wrote:
>Second question -- IB BMME and iWARP talk about a key portion (least
>significant byte) of STag/L_Key/R_Key as being under consumer control.
>Do we want to expose that as part of this API?  Basically it means we
>need to add a way for the consumer to pass in a new L_Key/STag as part
>of a lot of calls.

I think the Key portion is a quite useful way for the upper layer to
salt the actual R_Keys as a protection mechanism, and having it would
simplify a bunch of defensive code in the NFS/RDMA client. Currently,
because the keys are provider-chosen and potentially recycled, there
is a latent risk.

But, I only want it if ALL future providers support it in some way. If a
subset does not, it's not worth coding around the differences.

Tom.