[openib-general] Re: libibverbs and max inline data

[Michael S. Tsirkin]

Quoting r. Roland Dreier <roland at topspin.com>:
> Subject: Re: libibverbs and max inline data
> 
>     Michael> Hi!  I tried to figure out how much inline data a qp can
>     Michael> support, to know what max_inline_data value to put in the
>     Michael> qp.  However, there doesnt seem to exist a way to do
>     Michael> that, currently.
> 
> I think you're right.
> 
>     Michael> Maybe the driver should be changed to trim
>     Michael> max_inline_data to the maximum possible value?
> 
> Yes, that would probably make sense.  In a sense that's what the
> kernel driver already does -- it always clips the max_inline_data
> request from the consumer down to 0.

Right. So the driver could check the context to know what to return:
0 or the actual value.

> Independent of that we could add a field to the device properties
> struct (and implement ibv_query_device() for userspace).
> 
>  - R.

-- 
MST - Michael S. Tsirkin