linux-kernel - [PATCH net-next v1] idpf: export RX hardware timestamping information to XDP

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Message-ID: <20251122140839.3922015-1-almasrymina@google.com>
Date: Sat, 22 Nov 2025 14:08:36 +0000
From: Mina Almasry <almasrymina@...gle.com>
To: netdev@...r.kernel.org, bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: YiFei Zhu <zhuyifei@...gle.com>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, "David S. Miller" <davem@...emloft.net>, 
	Jakub Kicinski <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>, 
	John Fastabend <john.fastabend@...il.com>, Stanislav Fomichev <sdf@...ichev.me>, 
	Tony Nguyen <anthony.l.nguyen@...el.com>, Przemek Kitszel <przemyslaw.kitszel@...el.com>, 
	Andrew Lunn <andrew+netdev@...n.ch>, Eric Dumazet <edumazet@...gle.com>, 
	Paolo Abeni <pabeni@...hat.com>, Alexander Lobakin <aleksander.lobakin@...el.com>, 
	Richard Cochran <richardcochran@...il.com>, intel-wired-lan@...ts.osuosl.org, 
	Mina Almasry <almasrymina@...gle.com>
Subject: [PATCH net-next v1] idpf: export RX hardware timestamping information
 to XDP

From: YiFei Zhu <zhuyifei@...gle.com>

The logic is similar to idpf_rx_hwtstamp, but the data is exported
as a BPF kfunc instead of appended to an skb.

A idpf_queue_has(PTP, rxq) condition is added to check the queue
supports PTP similar to idpf_rx_process_skb_fields.

Cc: intel-wired-lan@...ts.osuosl.org

Signed-off-by: YiFei Zhu <zhuyifei@...gle.com>
Signed-off-by: Mina Almasry <almasrymina@...gle.com>
---
 drivers/net/ethernet/intel/idpf/xdp.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/xdp.c b/drivers/net/ethernet/intel/idpf/xdp.c
index 21ce25b0567f..850389ca66b6 100644
--- a/drivers/net/ethernet/intel/idpf/xdp.c
+++ b/drivers/net/ethernet/intel/idpf/xdp.c
@@ -2,6 +2,7 @@
 /* Copyright (C) 2025 Intel Corporation */
 
 #include "idpf.h"
+#include "idpf_ptp.h"
 #include "idpf_virtchnl.h"
 #include "xdp.h"
 #include "xsk.h"
@@ -369,6 +370,31 @@ int idpf_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 				       idpf_xdp_tx_finalize);
 }
 
+static int idpf_xdpmo_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp)
+{
+	const struct virtchnl2_rx_flex_desc_adv_nic_3 *rx_desc;
+	const struct libeth_xdp_buff *xdp = (typeof(xdp))ctx;
+	const struct idpf_rx_queue *rxq;
+	u64 cached_time, ts_ns;
+	u32 ts_high;
+
+	rx_desc = xdp->desc;
+	rxq = libeth_xdp_buff_to_rq(xdp, typeof(*rxq), xdp_rxq);
+
+	if (!idpf_queue_has(PTP, rxq))
+		return -ENODATA;
+	if (!(rx_desc->ts_low & VIRTCHNL2_RX_FLEX_TSTAMP_VALID))
+		return -ENODATA;
+
+	cached_time = READ_ONCE(rxq->cached_phc_time);
+
+	ts_high = le32_to_cpu(rx_desc->ts_high);
+	ts_ns = idpf_ptp_tstamp_extend_32b_to_64b(cached_time, ts_high);
+
+	*timestamp = ts_ns;
+	return 0;
+}
+
 static int idpf_xdpmo_rx_hash(const struct xdp_md *ctx, u32 *hash,
 			      enum xdp_rss_hash_type *rss_type)
 {
@@ -392,6 +418,7 @@ static int idpf_xdpmo_rx_hash(const struct xdp_md *ctx, u32 *hash,
 }
 
 static const struct xdp_metadata_ops idpf_xdpmo = {
+	.xmo_rx_timestamp	= idpf_xdpmo_rx_timestamp,
 	.xmo_rx_hash		= idpf_xdpmo_rx_hash,
 };
 

base-commit: e05021a829b834fecbd42b173e55382416571b2c
-- 
2.52.0.rc2.455.g230fcf2819-goog