> On Sat, 20 Jun 2020 00:57:17 +0200
> Lorenzo Bianconi <lorenzo@xxxxxxxxxx> wrote:
>
> > From: David Ahern <dahern@xxxxxxxxxxxxxxxx>
> >
[...]
> > if (unlikely((headroom - metasize) < sizeof(*xdp_frame)))
> > - return NULL;
> > + return -ENOMEM;
>
> IMHO I think ENOMEM is reserved for memory allocations failures.
> I think ENOSPC will be more appropriate here (or EOVERFLOW).
ack, I will fix it in v3
Regards,
Lorenzo
>
> >
> > /* Catch if driver didn't reserve tailroom for skb_shared_info */
> > if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) {
> > XDP_WARN("Driver BUG: missing reserved tailroom");
> > - return NULL;
> > + return -ENOMEM;
>
> Same here.
>
> > }
> >
> > - /* Store info in top of packet */
> > - xdp_frame = xdp->data_hard_start;
> > -
> > xdp_frame->data = xdp->data;
> > xdp_frame->len = xdp->data_end - xdp->data;
> > xdp_frame->headroom = headroom - sizeof(*xdp_frame);
> > xdp_frame->metasize = metasize;
> > xdp_frame->frame_sz = xdp->frame_sz;
> >
> > + return 0;
> > +}
> > +
> > +/* Convert xdp_buff to xdp_frame */
> > +static inline
> > +struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp)
> > +{
> > + struct xdp_frame *xdp_frame;
> > +
> > + if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)
> > + return xdp_convert_zc_to_xdp_frame(xdp);
> > +
> > + /* Store info in top of packet */
> > + xdp_frame = xdp->data_hard_start;
> > + if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0))
> > + return NULL;
> > +
> > /* rxq only valid until napi_schedule ends, convert to xdp_mem_info */
> > xdp_frame->mem = xdp->rxq->mem;
> >
>
>
>
> --
> Best regards,
> Jesper Dangaard Brouer
> MSc.CS, Principal Kernel Engineer at Red Hat
> LinkedIn: http://www.linkedin.com/in/brouer
>
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