@@ -419,30 +419,40 @@ static bool __virtnet_xdp_xmit(struct virtnet_info *vi,
struct xdp_buff *xdp)
{
struct virtio_net_hdr_mrg_rxbuf *hdr;
- unsigned int len;
+ struct xdp_frame *xdpf, *xdpf_sent;
struct send_queue *sq;
+ unsigned int len;
unsigned int qp;
- void *xdp_sent;
int err;
qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
sq = &vi->sq[qp];
/* Free up any pending old buffers before queueing new ones. */
- while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) {
- struct page *sent_page = virt_to_head_page(xdp_sent);
+ while ((xdpf_sent = virtqueue_get_buf(sq->vq, &len)) != NULL)
+ xdp_return_frame(xdpf_sent->data, &xdpf_sent->mem);
- put_page(sent_page);
- }
+ xdpf = convert_to_xdp_frame(xdp);
+ if (unlikely(!xdpf))
+ return -EOVERFLOW;
+
+ /* virtqueue want to use data area in-front of packet */
+ if (unlikely(xdpf->metasize > 0))
+ return -EOPNOTSUPP;
+
+ if (unlikely(xdpf->headroom < vi->hdr_len))
+ return -EOVERFLOW;
- xdp->data -= vi->hdr_len;
+ /* Make room for virtqueue hdr (also change xdpf->headroom?) */
+ xdpf->data -= vi->hdr_len;
/* Zero header and leave csum up to XDP layers */
- hdr = xdp->data;
+ hdr = xdpf->data;
memset(hdr, 0, vi->hdr_len);
+ xdpf->len += vi->hdr_len;
- sg_init_one(sq->sg, xdp->data, xdp->data_end - xdp->data);
+ sg_init_one(sq->sg, xdpf->data, xdpf->len);
- err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp->data, GFP_ATOMIC);
+ err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdpf, GFP_ATOMIC);
if (unlikely(err))
return false; /* Caller handle free/refcnt */
The virtio_net driver assumes XDP frames are always released based on page refcnt (via put_page). Thus, is only queues the XDP data pointer address and uses virt_to_head_page() to retrieve struct page. Use the XDP return API to get away from such assumptions. Instead queue an xdp_frame, which allow us to use the xdp_return_frame API, when releasing the frame. V8: Avoid endianness issues (found by kbuild test robot) Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> --- drivers/net/virtio_net.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-)