> On Wed, Oct 28, 2020 at 11:23:04AM +0100, Lorenzo Bianconi wrote:
> > > Hi Lorenzo,
> >
> > Hi Ilias,
> >
> > thx for the review.
> >
> > >
> > > On Tue, Oct 27, 2020 at 08:04:07PM +0100, Lorenzo Bianconi wrote:
> >
> > [...]
> >
> > > > +void xdp_return_frame_bulk(struct xdp_frame *xdpf,
> > > > + struct xdp_frame_bulk *bq)
> > > > +{
> > > > + struct xdp_mem_info *mem = &xdpf->mem;
> > > > + struct xdp_mem_allocator *xa, *nxa;
> > > > +
> > > > + if (mem->type != MEM_TYPE_PAGE_POOL) {
> > > > + __xdp_return(xdpf->data, &xdpf->mem, false);
> > > > + return;
> > > > + }
> > > > +
> > > > + rcu_read_lock();
> > > > +
> > > > + xa = bq->xa;
> > > > + if (unlikely(!xa || mem->id != xa->mem.id)) {
> > >
> > > Why is this marked as unlikely? The driver passes it as NULL. Should
> > > unlikely be
> > > checked on both xa and the comparison?
> >
> > xa is NULL only for the first xdp_frame in the burst while it is set for
> > subsequent ones. Do you think it is better to remove it?
>
> Ah correct, missed the general context of the driver this runs in.
>
> >
> > >
> > > > + nxa = rhashtable_lookup(mem_id_ht, &mem->id,
> > > > mem_id_rht_params);
> > >
> > > Is there a chance nxa can be NULL?
> >
> > I do not think so since the page_pool is not destroyed while there are
> > in-flight pages, right?
>
> I think so but I am not 100% sure. I'll apply the patch and have a closer lookack, thx. I converted socionext driver to bulking APIs but I have not posted the patch since I have not been able to test it. The code is available here: https://github.com/LorenzoBianconi/net-next/commit/88c2995bca051fa38860acf7b915c90768460d37 Regards, Lorenzo > > Cheers > /Ilias
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