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Hi Li, please do remember to use a [cyborg] topic marker in your subject 
line. (I've added one). Comments inline.

On 04/12/2018 11:08 PM, Li Liu wrote:
> Hi Team,
> 
> While wrapping up spec for FPGA programmability, I think we still miss 
> the reconfigurability part of Accelerators
> 
> For instance, in the FPGA case, after the bitstream is loaded, a user 
> might still need to tune the clock frequency, VF numbers, do reset, etc.

When you say "user" above, are you referring to a normal unprivileged 
user or are you referring to a privileged user like an admin or MANO system?

I'm not entirely sure why an unprivileged user would need to change the 
clock frequency or VF numbers for the FPGA, so I presume you are 
referring to a privileged user (admin)?

> These reconfigurations can be arbitory. Unfortunately, none of the APIs 
> we have right can handle them properly.
> 
> I suggest having another spec for a couple of new APIs dedicated 
> to reconfiguring accelerators.
> 
> 1. A rest API
> 2. A driver API

If my presumption from above is correct -- that you are referring to 
privileged users (and not the unprivileged users that are spinning up 
workloads that utilize the FPGA) -- then I believe a non-REST API is 
appropriate. REST APIs are typically more appropriate when trying 
provide a publicly-accessible endpoint for unprivileged users to perform 
actions against something. It's also easier to modify a driver API vs a 
REST API due to not having to be as concerned about backwards 
compatibility and things like microversions.

Best,
-jay

> I want to gather more ideas from you guys especially from our vendor 
> folks :)
> 
> 
> 
> -- 
> Thank you
> 
> Regards
> 
> Li Liu
> 
> 
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