netdev - Re: [Intel-wired-lan] [PATCH iwl-next v7 02/12] ice: support Rx timestamp on flex descriptor

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Date: Sat, 8 Jun 2024 13:56:53 +0100
From: Simon Horman <horms@...nel.org>
To: Mateusz Polchlopek <mateusz.polchlopek@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	Simei Su <simei.su@...el.com>,
	Wojciech Drewek <wojciech.drewek@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next v7 02/12] ice: support Rx
 timestamp on flex descriptor

On Tue, Jun 04, 2024 at 09:13:50AM -0400, Mateusz Polchlopek wrote:
> From: Simei Su <simei.su@...el.com>
> 
> To support Rx timestamp offload, VIRTCHNL_OP_1588_PTP_CAPS is sent by
> the VF to request PTP capability and responded by the PF what capability
> is enabled for that VF.
> 
> Hardware captures timestamps which contain only 32 bits of nominal
> nanoseconds, as opposed to the 64bit timestamps that the stack expects.
> To convert 32b to 64b, we need a current PHC time.
> VIRTCHNL_OP_1588_PTP_GET_TIME is sent by the VF and responded by the
> PF with the current PHC time.
> 
> Signed-off-by: Simei Su <simei.su@...el.com>
> Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
> Co-developed-by: Mateusz Polchlopek <mateusz.polchlopek@...el.com>
> Signed-off-by: Mateusz Polchlopek <mateusz.polchlopek@...el.com>

Reviewed-by: Simon Horman <horms@...nel.org>