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

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Message-ID: <20260108133159.GH345651@kernel.org>
Date: Thu, 8 Jan 2026 13:31:59 +0000
From: Simon Horman <horms@...nel.org>
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>,
	Alexander Lobakin <aleksander.lobakin@...el.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

On Tue, Dec 23, 2025 at 07:46:46PM +0000, Mina Almasry wrote:
> 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: Simon Horman <horms@...nel.org>