[openib-general] Re: 2/2 libibverbs + libmthca changes for query QP

[Michael S. Tsirkin]

Quoting r. Roland Dreier <rdreier at cisco.com>:
> Subject: Re: 2/2 libibverbs + libmthca changes for query QP
> 
> This reminds me of something I've been meaning to ask: what is the
> attr_mask of the query QP function used for?  The verbs definition in
> the IB spec does not include an attribute mask.  Obviously we don't
> have to follow the spec precisely but I'm wondering what the advantage
> is in having an attribute mask for query QP.  None of the other query
> methods (including query SRQ) have an attribute mask.
> 
>  - R.

Mellanox driver does not need it.
AFAIK the eHCA driver seems to use this mask.
Can one of the eHCA authors explain why?

-- 
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies