Re: [PATCH bpf-next v4] virtio_net: add XDP meta data support

[Jason Wang <jasowang@xxxxxxxxxx>]

On 2020/2/5 下午5:18, Yuya Kusakabe wrote:
> > >            case XDP_TX:
> > >                stats->xdp_tx++;
> > > +            xdp.data_meta = xdp.data;
> > Any reason for doing this?
> XDP_TX can not support metadata for now, because if metasize > 0, __virtnet_xdp_xmit_one() returns EOPNOTSUPP.
>
> static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
> 				   struct send_queue *sq,
> 				   struct xdp_frame *xdpf)
> {
> 	struct virtio_net_hdr_mrg_rxbuf *hdr;
> 	int err;
>
> 	/* virtqueue want to use data area in-front of packet */
> 	if (unlikely(xdpf->metasize > 0))
> 		return -EOPNOTSUPP;

I see.

Then I think it's better to fix __virtnet_xdp_xmit_one() instead.

Thanks