[RFC PATCH v3] ethdev: support selective Rx data

[Stephen Hemminger]

On Mon, 19 Jan 2026 13:23:02 +0200 (IST)
"Etelson, Gregory" <getelson at nvidia.com> wrote:

> Hello,
> 
> >> In some cases application does not need to receive entire packet
> >> from port hardware.  
> >
> > Which scenarios need to be used?  
> 
> A typical use case for the selective Rx data read can be the SAMPLE flow action.
> In that scenario, Rx queue that receives sampled packet copy can be configured 
> to deliver to application partial packet data.
> 
> > What is the behavior when
> > LRO(TCP packet aggregation is performed by hardware) is enabled?
> >  
> 
> The selective Rx data read is applied to MBUF layout that will be delivered to 
> an application.
> That functionality comes after all HW Rx offloads.


What is the intended behavior in the selective case. Is there any mechanism for
application to see original length?