> On Sun, May 31, 2020 at 11:46:49PM +0200, Lorenzo Bianconi wrote:
> > +
> > + prog = READ_ONCE(rcpu->prog);
> > for (i = 0; i < n; i++) {
> > - void *f = frames[i];
> > + void *f = xdp_frames[i];
> > struct page *page = virt_to_page(f);
> > + struct xdp_frame *xdpf;
> > + struct xdp_buff xdp;
> > + u32 act;
> > + int err;
> >
> > /* Bring struct page memory area to curr CPU. Read by
> > * build_skb_around via page_is_pfmemalloc(), and when
> > * freed written by page_frag_free call.
> > */
> > prefetchw(page);
> > + if (!prog) {
> > + frames[nframes++] = xdp_frames[i];
> > + continue;
> > + }
>
> I'm not sure compiler will be smart enough to hoist !prog check out of the
> loop.
> Otherwise default cpumap case will be a bit slower.
> I'd like to see performance numbers before/after and acks from folks
> who are using cpumap before applying.
> Also please add selftest for it. samples/bpf/ in patch 6 is not enough.Hi Alexei, thx for the review. I will add a selftest and some performance numbers in v2. Regards, Lorenzo > > Other than the above the feature looks good to me. It nicely complements > devmap.
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