netdev - [RFC net-next 13/18] virtio_net: use XDP attachment helpers

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Date:   Tue, 26 Nov 2019 19:07:39 +0900
From:   Prashant Bhole <prashantbhole.linux@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        "Michael S . Tsirkin" <mst@...hat.com>
Cc:     Prashant Bhole <prashantbhole.linux@...il.com>,
        Jason Wang <jasowang@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org,
        qemu-devel@...gnu.org, kvm@...r.kernel.org
Subject: [RFC net-next 13/18] virtio_net: use XDP attachment helpers

Next patches will introduce virtio_net XDP offloading. In that case
we need to manage offloaded and non-offload program. In order to make
it consistent this patch introduces use of XDP attachment helpers.

Signed-off-by: Prashant Bhole <prashantbhole.linux@...il.com>
---
 drivers/net/virtio_net.c | 30 +++++++++++-------------------
 1 file changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index c8bbb1b90c1c..cee5c2b15c62 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -229,6 +229,8 @@ struct virtnet_info {
 	struct failover *failover;
 
 	struct bpf_prog __rcu *xdp_prog;
+
+	struct xdp_attachment_info xdp;
 };
 
 struct padded_vnet_hdr {
@@ -2398,15 +2400,19 @@ static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
 	return virtnet_set_guest_offloads(vi, offloads);
 }
 
-static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
-			   struct netlink_ext_ack *extack)
+static int virtnet_xdp_set(struct net_device *dev, struct netdev_bpf *bpf)
 {
 	unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
+	struct netlink_ext_ack *extack = bpf->extack;
 	struct virtnet_info *vi = netdev_priv(dev);
+	struct bpf_prog *prog = bpf->prog;
 	struct bpf_prog *old_prog;
 	u16 xdp_qp = 0, curr_qp;
 	int i, err;
 
+	if (!xdp_attachment_flags_ok(&vi->xdp, bpf))
+		return -EBUSY;
+
 	if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
 	    && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
 	        virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
@@ -2478,8 +2484,7 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
 		}
 	}
 
-	if (old_prog)
-		bpf_prog_put(old_prog);
+	xdp_attachment_setup(&vi->xdp, bpf);
 
 	return 0;
 
@@ -2501,26 +2506,13 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
 	return err;
 }
 
-static u32 virtnet_xdp_query(struct net_device *dev)
-{
-	struct virtnet_info *vi = netdev_priv(dev);
-	const struct bpf_prog *xdp_prog;
-
-	xdp_prog = rtnl_dereference(vi->xdp_prog);
-	if (xdp_prog)
-		return xdp_prog->aux->id;
-
-	return 0;
-}
-
 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 {
 	switch (xdp->command) {
 	case XDP_SETUP_PROG:
-		return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
+		return virtnet_xdp_set(dev, xdp);
 	case XDP_QUERY_PROG:
-		xdp->prog_id = virtnet_xdp_query(dev);
-		return 0;
+		return xdp_attachment_query(&vi->xdp, xdp);
 	default:
 		return -EINVAL;
 	}
-- 
2.20.1