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idpf: export RX hardware timestamping information to XDP

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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@lists.osuosl.org
Signed-off-by: YiFei Zhu <zhuyifei@google.com>
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
YiFei Zhu
2025-12-23 19:46:46 +00:00
committed by Tony Nguyen
parent 24f90786ef
commit 13a4be4126
2 changed files with 51 additions and 0 deletions
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31
drivers/net/ethernet/intel/idpf/xdp.c
View File

@@ -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)

20
drivers/net/ethernet/intel/idpf/xdp.h
View File

@@ -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);