[RFC PATCH net-next V2 6/6] virtio-net: support XDP rx handler
From: Jason Wang <hidden>
Date: 2018-08-13 03:18:02
Also in:
lkml
Subsystem:
networking drivers, the rest, virtio net driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, "Michael S. Tsirkin", Jason Wang
This patch tries to add the support of XDP rx handler to virtio-net. This is straight-forward, just call xdp_do_pass() and behave depends on its return value. Test was done by using XDP_DROP (xdp1) for macvlan on top of virtio-net. PPS of SKB mode was ~1.2Mpps while PPS of native XDP mode was ~2.2Mpps. About 83% improvement was measured. Notes: for RFC, only mergeable buffer case was implemented. Signed-off-by: Jason Wang <redacted> --- drivers/net/virtio_net.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 62311dd..1e22ad9 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c@@ -777,6 +777,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); if (xdp_prog) { + rx_xdp_handler_result_t ret; struct xdp_frame *xdpf; struct page *xdp_page; struct xdp_buff xdp;
@@ -825,6 +826,15 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, switch (act) { case XDP_PASS: + ret = xdp_do_pass(&xdp); + if (ret == RX_XDP_HANDLER_DROP) + goto drop; + if (ret != RX_XDP_HANDLER_FALLBACK) { + if (unlikely(xdp_page != page)) + put_page(page); + rcu_read_unlock(); + goto xdp_xmit; + } /* recalculate offset to account for any header * adjustments. Note other cases do not build an * skb and avoid using offset
@@ -881,6 +891,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, case XDP_ABORTED: trace_xdp_exception(vi->dev, xdp_prog, act); /* fall through */ +drop: case XDP_DROP: if (unlikely(xdp_page != page)) __free_pages(xdp_page, 0);
--
2.7.4