netdev - [PATCH bpf-next v2 4/8] veth: Support RX XDP metadata

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Date:   Mon, 21 Nov 2022 10:25:48 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     bpf@...r.kernel.org
Cc:     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 4/8] veth: Support RX XDP metadata

The goal is to enable end-to-end testing of the metadata for AF_XDP.

Cc: John Fastabend <john.fastabend@...il.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: Jesper Dangaard Brouer <brouer@...hat.com>
Cc: Anatoly Burakov <anatoly.burakov@...el.com>
Cc: Alexander Lobakin <alexandr.lobakin@...el.com>
Cc: Magnus Karlsson <magnus.karlsson@...il.com>
Cc: Maryam Tahhan <mtahhan@...hat.com>
Cc: xdp-hints@...-project.net
Cc: netdev@...r.kernel.org
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 drivers/net/veth.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index bbabc592d431..fdbca2aee33a 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -118,6 +118,7 @@ static struct {
 
 struct veth_xdp_buff {
 	struct xdp_buff xdp;
+	struct sk_buff *skb;
 };
 
 static int veth_get_link_ksettings(struct net_device *dev,
@@ -602,6 +603,7 @@ static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq,
 
 		xdp_convert_frame_to_buff(frame, xdp);
 		xdp->rxq = &rq->xdp_rxq;
+		vxbuf.skb = NULL;
 
 		act = bpf_prog_run_xdp(xdp_prog, xdp);
 
@@ -823,6 +825,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
 	__skb_push(skb, skb->data - skb_mac_header(skb));
 	if (veth_convert_skb_to_xdp_buff(rq, xdp, &skb))
 		goto drop;
+	vxbuf.skb = skb;
 
 	orig_data = xdp->data;
 	orig_data_end = xdp->data_end;
@@ -1665,6 +1668,30 @@ static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 	}
 }
 
+static bool veth_xdp_rx_timestamp_supported(const struct xdp_md *ctx)
+{
+	return true;
+}
+
+static u64 veth_xdp_rx_timestamp(const struct xdp_md *ctx)
+{
+	return ktime_get_mono_fast_ns();
+}
+
+static bool veth_xdp_rx_hash_supported(const struct xdp_md *ctx)
+{
+	return true;
+}
+
+static u32 veth_xdp_rx_hash(const struct xdp_md *ctx)
+{
+	struct veth_xdp_buff *_ctx = (void *)ctx;
+
+	if (_ctx->skb)
+		return skb_get_hash(_ctx->skb);
+	return 0;
+}
+
 static const struct net_device_ops veth_netdev_ops = {
 	.ndo_init            = veth_dev_init,
 	.ndo_open            = veth_open,
@@ -1684,6 +1711,11 @@ static const struct net_device_ops veth_netdev_ops = {
 	.ndo_bpf		= veth_xdp,
 	.ndo_xdp_xmit		= veth_ndo_xdp_xmit,
 	.ndo_get_peer_dev	= veth_peer_dev,
+
+	.ndo_xdp_rx_timestamp_supported = veth_xdp_rx_timestamp_supported,
+	.ndo_xdp_rx_timestamp	= veth_xdp_rx_timestamp,
+	.ndo_xdp_rx_hash_supported = veth_xdp_rx_hash_supported,
+	.ndo_xdp_rx_hash	= veth_xdp_rx_hash,
 };
 
 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
-- 
2.38.1.584.g0f3c55d4c2-goog