linux-kernel - Re: [PATCH iwl-next v4] idpf: export RX hardware timestamping information to XDP

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Message-ID: <1c8c6856-fbf4-4060-b81c-9bf867009ea7@intel.com>
Date: Mon, 5 Jan 2026 16:45:09 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Mina Almasry <almasrymina@...gle.com>
CC: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, 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>, Richard Cochran <richardcochran@...il.com>,
	<intel-wired-lan@...ts.osuosl.org>, Aleksandr Loktionov
	<aleksandr.loktionov@...el.com>
Subject: Re: [PATCH iwl-next v4] idpf: export RX hardware timestamping
 information to XDP

From: Mina Almasry <almasrymina@...gle.com>
Date: Tue, 23 Dec 2025 19:46:46 +0000

> 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
> retreivable 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>

Thanks,
Olek