[xdp-hints] [RFC bpf-next v2 18/24] veth: Implement VLAN tag and checksum XDP hint

[Larysa Zaremba <larysa.zaremba@intel.com>]

In order to test VLAN tag and checksum XDP hints in hardware-independent
selftests, implement newly added XDP hints in veth driver.

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/veth.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 0deefd1573cf..b17938a43f98 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1736,6 +1736,46 @@ static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
 	return 0;
 }
 
+static int veth_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto,
+				u16 *vlan_tci)
+{
+	struct veth_xdp_buff *_ctx = (void *)ctx;
+	struct sk_buff *skb = _ctx->skb;
+	int err;
+
+	if (!skb)
+		return -ENODATA;
+
+	err = __vlan_hwaccel_get_tag(skb, vlan_tci);
+	if (err)
+		return err;
+
+	*vlan_proto = skb->vlan_proto;
+	return err;
+}
+
+static int veth_xdp_rx_csum(const struct xdp_md *ctx,
+			    enum xdp_csum_status *csum_status,
+			    __wsum *csum)
+{
+	struct veth_xdp_buff *_ctx = (void *)ctx;
+	struct sk_buff *skb = _ctx->skb;
+
+	if (!skb)
+		return -ENODATA;
+
+	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+		*csum_status = XDP_CHECKSUM_VERIFIED;
+	} else if (skb->ip_summed == CHECKSUM_COMPLETE) {
+		*csum_status = XDP_CHECKSUM_COMPLETE;
+		*csum = skb->csum;
+	} else {
+		return -ENODATA;
+	}
+
+	return 0;
+}
+
 static const struct net_device_ops veth_netdev_ops = {
 	.ndo_init            = veth_dev_init,
 	.ndo_open            = veth_open,
@@ -1760,6 +1800,8 @@ static const struct net_device_ops veth_netdev_ops = {
 static const struct xdp_metadata_ops veth_xdp_metadata_ops = {
 	.xmo_rx_timestamp		= veth_xdp_rx_timestamp,
 	.xmo_rx_hash			= veth_xdp_rx_hash,
+	.xmo_rx_vlan_tag		= veth_xdp_rx_vlan_tag,
+	.xmo_rx_csum			= veth_xdp_rx_csum,
 };
 
 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
-- 
2.41.0