> On Tue, 26 May 2020 15:48:13 +0200
> Lorenzo Bianconi <lorenzo@xxxxxxxxxx> wrote:
>
[...]
> > diff --git a/include/net/xdp.h b/include/net/xdp.h
> > index 90f11760bd12..5dbdd65866a9 100644
> > --- a/include/net/xdp.h
> > +++ b/include/net/xdp.h
> > @@ -106,6 +106,16 @@ void xdp_warn(const char *msg, const char *func, const int line);
> >
> > struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp);
> >
> > +static inline
> > +void convert_to_xdp_buff(struct xdp_frame *frame, struct xdp_buff *xdp)
> > +{
> > + xdp->data_hard_start = (void *)frame;
>
> This assumption is problematic. You are suppose to deduct this from
> frame->data pointer.
>
> Currently the xdp_frame is designed and access such that is is possible
> to use another memory area for xdp_frame. That would break after this
> change.
>
> This should instead be:
>
> xdp->data_hard_start = frame->data - (frame->headroom + sizeof(struct xdp_frame));
ack, fine. I will fix it v2.
Regards,
Lorenzo
>
> > + xdp->data = frame->data;
> > + xdp->data_end = frame->data + frame->len;
> > + xdp->data_meta = frame->data - frame->metasize;
> > + xdp->frame_sz = frame->frame_sz;
> > +}
> > +
>
> --
> Best regards,
> Jesper Dangaard Brouer
> MSc.CS, Principal Kernel Engineer at Red Hat
> LinkedIn: http://www.linkedin.com/in/brouer
>
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