On Fri, 16 Mar 2018 16:45:30 +0800 Jason Wang <jasow...@redhat.com> wrote:
> On 2018年03月10日 00:07, Jesper Dangaard Brouer wrote: > > On Fri, 9 Mar 2018 21:07:36 +0800 > > Jason Wang <jasow...@redhat.com> wrote: > > > >>>>> 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<bro...@redhat.com> > >>>> 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?). > > 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
