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Message-ID: <20260126224313.3847849-8-anthony.l.nguyen@intel.com>
Date: Mon, 26 Jan 2026 14:43:11 -0800
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
kuba@...nel.org,
pabeni@...hat.com,
edumazet@...gle.com,
andrew+netdev@...n.ch,
netdev@...r.kernel.org
Cc: YiFei Zhu <zhuyifei@...gle.com>,
anthony.l.nguyen@...el.com,
maciej.fijalkowski@...el.com,
magnus.karlsson@...el.com,
ast@...nel.org,
daniel@...earbox.net,
hawk@...nel.org,
john.fastabend@...il.com,
sdf@...ichev.me,
bpf@...r.kernel.org,
intel-wired-lan@...ts.osuosl.org,
Mina Almasry <almasrymina@...gle.com>,
Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
Alexander Lobakin <aleksander.lobakin@...el.com>,
Simon Horman <horms@...nel.org>
Subject: [PATCH net-next 7/7] 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 to support grabbing
timestamps in xsk packets.
A idpf_queue_has(PTP, rxq) condition is added to check the queue
supports PTP similar to idpf_rx_process_skb_fields.
Tested using an xsk connection and checking xdp timestamps are
retrievable in received packets.
Cc: intel-wired-lan@...ts.osuosl.org
Signed-off-by: YiFei Zhu <zhuyifei@...gle.com>
Signed-off-by: Mina Almasry <almasrymina@...gle.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
drivers/net/ethernet/intel/idpf/xdp.c | 31 +++++++++++++++++++++++++++
drivers/net/ethernet/intel/idpf/xdp.h | 20 +++++++++++++++++
2 files changed, 51 insertions(+)
diff --git a/drivers/net/ethernet/intel/idpf/xdp.c b/drivers/net/ethernet/intel/idpf/xdp.c
index 0fe435fdbb6c..2b60f2a78684 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"
@@ -398,8 +399,38 @@ static int idpf_xdpmo_rx_hash(const struct xdp_md *ctx, u32 *hash,
pt);
}
+static int idpf_xdpmo_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp)
+{
+ const struct libeth_xdp_buff *xdp = (typeof(xdp))ctx;
+ struct idpf_xdp_rx_desc desc __uninitialized;
+ const struct idpf_rx_queue *rxq;
+ u64 cached_time, ts_ns;
+ u32 ts_high;
+
+ rxq = libeth_xdp_buff_to_rq(xdp, typeof(*rxq), xdp_rxq);
+
+ if (!idpf_queue_has(PTP, rxq))
+ return -ENODATA;
+
+ idpf_xdp_get_qw1(&desc, xdp->desc);
+
+ if (!(idpf_xdp_rx_ts_low(&desc) & VIRTCHNL2_RX_FLEX_TSTAMP_VALID))
+ return -ENODATA;
+
+ cached_time = READ_ONCE(rxq->cached_phc_time);
+
+ idpf_xdp_get_qw3(&desc, xdp->desc);
+
+ ts_high = idpf_xdp_rx_ts_high(&desc);
+ ts_ns = idpf_ptp_tstamp_extend_32b_to_64b(cached_time, ts_high);
+
+ *timestamp = ts_ns;
+ return 0;
+}
+
static const struct xdp_metadata_ops idpf_xdpmo = {
.xmo_rx_hash = idpf_xdpmo_rx_hash,
+ .xmo_rx_timestamp = idpf_xdpmo_rx_timestamp,
};
void idpf_xdp_set_features(const struct idpf_vport *vport)
diff --git a/drivers/net/ethernet/intel/idpf/xdp.h b/drivers/net/ethernet/intel/idpf/xdp.h
index 7ffc6955dfae..63e56f7d43e0 100644
--- a/drivers/net/ethernet/intel/idpf/xdp.h
+++ b/drivers/net/ethernet/intel/idpf/xdp.h
@@ -112,11 +112,13 @@ struct idpf_xdp_rx_desc {
aligned_u64 qw1;
#define IDPF_XDP_RX_BUF GENMASK_ULL(47, 32)
#define IDPF_XDP_RX_EOP BIT_ULL(1)
+#define IDPF_XDP_RX_TS_LOW GENMASK_ULL(31, 24)
aligned_u64 qw2;
#define IDPF_XDP_RX_HASH GENMASK_ULL(31, 0)
aligned_u64 qw3;
+#define IDPF_XDP_RX_TS_HIGH GENMASK_ULL(63, 32)
} __aligned(4 * sizeof(u64));
static_assert(sizeof(struct idpf_xdp_rx_desc) ==
sizeof(struct virtchnl2_rx_flex_desc_adv_nic_3));
@@ -128,6 +130,8 @@ static_assert(sizeof(struct idpf_xdp_rx_desc) ==
#define idpf_xdp_rx_buf(desc) FIELD_GET(IDPF_XDP_RX_BUF, (desc)->qw1)
#define idpf_xdp_rx_eop(desc) !!((desc)->qw1 & IDPF_XDP_RX_EOP)
#define idpf_xdp_rx_hash(desc) FIELD_GET(IDPF_XDP_RX_HASH, (desc)->qw2)
+#define idpf_xdp_rx_ts_low(desc) FIELD_GET(IDPF_XDP_RX_TS_LOW, (desc)->qw1)
+#define idpf_xdp_rx_ts_high(desc) FIELD_GET(IDPF_XDP_RX_TS_HIGH, (desc)->qw3)
static inline void
idpf_xdp_get_qw0(struct idpf_xdp_rx_desc *desc,
@@ -149,6 +153,9 @@ idpf_xdp_get_qw1(struct idpf_xdp_rx_desc *desc,
desc->qw1 = ((const typeof(desc))rxd)->qw1;
#else
desc->qw1 = ((u64)le16_to_cpu(rxd->buf_id) << 32) |
+ ((u64)rxd->ts_low << 24) |
+ ((u64)rxd->fflags1 << 16) |
+ ((u64)rxd->status_err1 << 8) |
rxd->status_err0_qw1;
#endif
}
@@ -166,6 +173,19 @@ idpf_xdp_get_qw2(struct idpf_xdp_rx_desc *desc,
#endif
}
+static inline void
+idpf_xdp_get_qw3(struct idpf_xdp_rx_desc *desc,
+ const struct virtchnl2_rx_flex_desc_adv_nic_3 *rxd)
+{
+#ifdef __LIBETH_WORD_ACCESS
+ desc->qw3 = ((const typeof(desc))rxd)->qw3;
+#else
+ desc->qw3 = ((u64)le32_to_cpu(rxd->ts_high) << 32) |
+ ((u64)le16_to_cpu(rxd->fmd6) << 16) |
+ le16_to_cpu(rxd->l2tag1);
+#endif
+}
+
void idpf_xdp_set_features(const struct idpf_vport *vport);
int idpf_xdp(struct net_device *dev, struct netdev_bpf *xdp);
--
2.47.1
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