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

[Michael S. Tsirkin]

Quoting r. Sean Hefty <sean.hefty at intel.com>:
> Subject: RE: Re: RFC: e2e credits
> 
> >What does the flow_control parameter in ib_cm and rdma_cma conn_param do?
> >If that's what it is, I think its easier to just add API to ib verbs
> >making it possible to implement it than invent a device-specific way
> >to do it per driver.
> 
> As far as I can tell, it doesn't do anything.  Flow control is a parameter of
> the IB CM REQ/REP messages, so are exposed to the user.
> 
> I don't see how a user can make use of it in any practical way, however.  It
> isn't used to configure anything on the QP from what I can tell.

So we can either add an ability to enable flow control per RQ,
or remove this option altogether.

-- 
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies