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tun: convert to use generic xdp_frame and xdp_return_frame API

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The tuntap driver invented it's own driver specific way of queuing
XDP packets, by storing the xdp_buff information in the top of
the XDP frame data.

Convert it over to use the more generic xdp_frame structure.  The
main problem with the in-driver method is that the xdp_rxq_info pointer
cannot be trused/used when dequeueing the frame.

V3: Remove check based on feedback from Jason

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer
2018-04-17 16:45:47 +02:00
committed by David S. Miller
parent c0048cff8a
commit 1ffcbc8537
3 changed files with 26 additions and 28 deletions
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7
drivers/vhost/net.c
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@@ -32,6 +32,7 @@
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/xdp.h>
#include "vhost.h"
@@ -181,10 +182,10 @@ static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq)
static int vhost_net_buf_peek_len(void *ptr)
{
if (tun_is_xdp_buff(ptr)) {
struct xdp_buff *xdp = tun_ptr_to_xdp(ptr);
if (tun_is_xdp_frame(ptr)) {
struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr);
return xdp->data_end - xdp->data;
return xdpf->len;
}
return __skb_array_len_with_tag(ptr);