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tuntap: XDP transmission

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This patch implements XDP transmission for TAP. Since we can't create
new queues for TAP during XDP set, exist ptr_ring was reused for
queuing XDP buffers. To differ xdp_buff from sk_buff, TUN_XDP_FLAG
(0x1UL) was encoded into lowest bit of xpd_buff pointer during
ptr_ring_produce, and was decoded during consuming. XDP metadata was
stored in the headroom of the packet which should work in most of
cases since driver usually reserve enough headroom. Very minor changes
were done for vhost_net: it just need to peek the length depends on
the type of pointer.

Tests were done on two Intel E5-2630 2.40GHz machines connected back
to back through two 82599ES. Traffic were generated/received through
MoonGen/testpmd(rxonly). It reports ~20% improvements when
xdp_redirect_map is doing redirection from ixgbe to TAP (from 2.50Mpps
to 3.05Mpps)

Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang
2018-01-04 11:14:28 +08:00
committed by David S. Miller
parent 5990a30510
commit fc72d1d54d
3 changed files with 208 additions and 33 deletions
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13
drivers/vhost/net.c
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@@ -175,6 +175,17 @@ 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);
return xdp->data_end - xdp->data;
}
return __skb_array_len_with_tag(ptr);
}
static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq)
{
struct vhost_net_buf *rxq = &nvq->rxq;
@@ -186,7 +197,7 @@ static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq)
return 0;
out:
return __skb_array_len_with_tag(vhost_net_buf_get_ptr(rxq));
return vhost_net_buf_peek_len(vhost_net_buf_get_ptr(rxq));
}
static void vhost_net_buf_init(struct vhost_net_buf *rxq)