[openib-general] Re: Re: RFC: e2e credits

[Sean Hefty]

Michael S. Tsirkin wrote:
> "Signifies whether the local CA actually implements End-to-End Flow Control
> (1), or instead always advertises .invalid credits.(0)."
> and we just take this meaning, with a clarification: "for this connection".

This sounds reasonable.

> Anyway, we have two options: removing this field from CM/CMA,
> and adding it as a low-level driver module option, or adding
> it to ib_qp_init_attr?
> 
> In the later case, I think we can avoid ABI breakage by packing this
> flag in unused space near other flags.
> 
> Personally, I think the second option is the less disruptive: it moves the
> policy of using the hardware flow control out to the ULPs, even if I can't come
> up with an example where this is useful - there's close to zero overhead to have
> it either.

My personal preference would be to have this policy controlled by the ULPs.

- Sean