netdev - [PATCH bpf-next v2 17/20] veth: Implement VLAN tag and checksum level XDP hint

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Date: Mon,  3 Jul 2023 20:12:23 +0200
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: bpf@...r.kernel.org
Cc: Larysa Zaremba <larysa.zaremba@...el.com>,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	song@...nel.org,
	yhs@...com,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...gle.com,
	haoluo@...gle.com,
	jolsa@...nel.org,
	David Ahern <dsahern@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Willem de Bruijn <willemb@...gle.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Anatoly Burakov <anatoly.burakov@...el.com>,
	Alexander Lobakin <alexandr.lobakin@...el.com>,
	Magnus Karlsson <magnus.karlsson@...il.com>,
	Maryam Tahhan <mtahhan@...hat.com>,
	xdp-hints@...-project.net,
	netdev@...r.kernel.org
Subject: [PATCH bpf-next v2 17/20] veth: Implement VLAN tag and checksum level XDP hint

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

Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
---
 drivers/net/veth.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 614f3e3efab0..a7f2b679551d 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1732,6 +1732,44 @@ 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, u16 *vlan_tag,
+				__be16 *vlan_proto)
+{
+	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_tag);
+	if (err)
+		return err;
+
+	*vlan_proto = skb->vlan_proto;
+	return err;
+}
+
+static int veth_xdp_rx_csum_lvl(const struct xdp_md *ctx, u8 *csum_level)
+{
+	struct veth_xdp_buff *_ctx = (void *)ctx;
+	struct sk_buff *skb = _ctx->skb;
+
+	if (!skb)
+		return -ENODATA;
+
+	if (skb->ip_summed == CHECKSUM_UNNECESSARY)
+		*csum_level = skb->csum_level;
+	else if (skb->ip_summed == CHECKSUM_PARTIAL &&
+		 skb_checksum_start_offset(skb) == skb_transport_offset(skb) ||
+		 skb->csum_valid)
+		*csum_level = 0;
+	else
+		return -ENODATA;
+
+	return 0;
+}
+
 static const struct net_device_ops veth_netdev_ops = {
 	.ndo_init            = veth_dev_init,
 	.ndo_open            = veth_open,
@@ -1756,6 +1794,8 @@ 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_lvl		= veth_xdp_rx_csum_lvl,
 };
 
 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
-- 
2.41.0