On Fri, 16 Mar 2018 16:45:30 +0800
Jason Wang [off-list ref] wrote:

On 2018年03月10日 00:07, Jesper Dangaard Brouer wrote:

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On Fri, 9 Mar 2018 21:07:36 +0800
Jason Wang [off-list ref] wrote:
 

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Use the IDA infrastructure for getting a cyclic increasing ID number,
that is used for keeping track of each registered allocator per
RX-queue xdp_rxq_info.

Signed-off-by: Jesper Dangaard Brouer<redacted>  

A stupid question is, can we manage to unify this ID with NAPI id?  

Sorry I don't understand the question?

I mean can we associate page poll pointer to napi_struct, record NAPI id
in xdp_mem_info and do lookup through NAPI id?  

No. The driver can unreg/reg a new XDP memory model,  

Is there an actual use case for this?

I believe this is the common use case.  When attaching an XDP/bpf prog,
then the driver usually want to change the RX-ring memory model
(different performance trade off).  When detaching XDP, then driver
want to change back to old memory model. During this process, I
believe, the NAPI-ID remains the same (right?).

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  without reloading
the NAPI and generate a new NAPI id.
 

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer