linux-kernel - Re: [PATCH net-next 0/6] gve: Add Rx HW timestamping support

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Message-ID: <d3e40052-0d23-4f9e-87b1-4b71164cfa13@linux.dev>
Date: Wed, 23 Apr 2025 11:13:10 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Harshitha Ramamurthy <hramamurthy@...gle.com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, jeroendb@...gle.com, andrew+netdev@...n.ch,
 willemb@...gle.com, ziweixiao@...gle.com, pkaligineedi@...gle.com,
 yyd@...gle.com, joshwash@...gle.com, shailend@...gle.com, linux@...blig.org,
 thostet@...gle.com, jfraker@...gle.com, horms@...nel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/6] gve: Add Rx HW timestamping support

On 18/04/2025 23:12, Harshitha Ramamurthy wrote:
> From: Ziwei Xiao <ziweixiao@...gle.com>
> 
> This patch series add the support of Rx HW timestamping, which sends
> adminq commands periodically to the device for clock synchronization with
> the nic.

It looks more like other PHC devices, but no PTP clock is exported. Do
you plan to implement TX HW timestamps for this device later?
Is it possible to use timecounter to provide proper PTP device on top of
GVE?

> 
> John Fraker (5):
>    gve: Add device option for nic clock synchronization
>    gve: Add adminq command to report nic timestamp.
>    gve: Add rx hardware timestamp expansion
>    gve: Add support for SIOC[GS]HWTSTAMP IOCTLs
>    gve: Advertise support for rx hardware timestamping
> 
> Kevin Yang (1):
>    gve: Add initial gve_clock
> 
>   drivers/net/ethernet/google/gve/Makefile      |   2 +-
>   drivers/net/ethernet/google/gve/gve.h         |  14 +++
>   drivers/net/ethernet/google/gve/gve_adminq.c  |  51 ++++++++-
>   drivers/net/ethernet/google/gve/gve_adminq.h  |  26 +++++
>   drivers/net/ethernet/google/gve/gve_clock.c   | 103 ++++++++++++++++++
>   .../net/ethernet/google/gve/gve_desc_dqo.h    |   3 +-
>   drivers/net/ethernet/google/gve/gve_ethtool.c |  23 +++-
>   drivers/net/ethernet/google/gve/gve_main.c    |  47 ++++++++
>   drivers/net/ethernet/google/gve/gve_rx_dqo.c  |  26 +++++
>   9 files changed, 290 insertions(+), 5 deletions(-)
>   create mode 100644 drivers/net/ethernet/google/gve/gve_clock.c
>