[dpdk-dev] [RFC v1 0/3] show the Rx/Tx burst description field

Stephen Hemminger stephen at networkplumber.org
Mon Aug 12 17:38:23 CEST 2019


On Mon, 12 Aug 2019 16:27:11 +0200
David Marchand <david.marchand at redhat.com> wrote:

> On Mon, Aug 12, 2019 at 4:20 PM Haiyue Wang <haiyue.wang at intel.com> wrote:
> >
> > Since some PMDs have multi-path for Rx/Tx, FD.io VPP will tell you in
> > the Debug CLI what rx/tx function is being used:
> >         #show hardware-interface
> >
> >          tx burst function: ice_xmit_pkts
> >          rx burst function: ice_recv_scattered_pkts
> >
> > But if the tx/rx is static, then 'dladdr' will return nil:
> >
> >          tx burst function: (nil) │······················
> >          rx burst function: (nil) │······················
> >
> > For making things consistent and gracefull, we introduce an new string
> > field to describe the Rx/Tx burst information. This is vendor-neutral,
> > it is used to identify the Rx/Tx burst selection if the PMD has more
> > than one.
> >
> > If a PMD supports this, then rxqinfo/txqinfo->burst_info[0] != '\0'.  
> 
> The rx/tx handlers are the same for all queues of a ethdev port.
> What is the added value to put this in a per queue api ?

With some symbol table lookup tools it is possible to do introspection
to find the symbol from the function pointer. Without breaking API/ABI.


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