netdev - Re: [net-next 08/14] net/mlx5e: Introduce lost_cqe statistic counter for PTP Tx port timestamping CQ

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Date: Tue, 14 Nov 2023 10:22:43 -0500
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Saeed Mahameed <saeed@...nel.org>, "David S. Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
 Tariq Toukan <tariqt@...dia.com>, Rahul Rameshbabu <rrameshbabu@...dia.com>
Subject: Re: [net-next 08/14] net/mlx5e: Introduce lost_cqe statistic counter
 for PTP Tx port timestamping CQ

On 13/11/2023 15:00, Saeed Mahameed wrote:
> From: Rahul Rameshbabu <rrameshbabu@...dia.com>
> 
> Track the number of times the a CQE was expected to not be delivered on PTP
> Tx port timestamping CQ. A CQE is expected to not be delivered of a certain
> amount of time passes since the corresponding CQE containing the DMA
> timestamp information has arrived. Increment the late_cqe counter when such
> a CQE does manage to be delivered to the CQ.
> 

It looks like missed/late timestamps is common problem for NICs. What do
you think about creating common counters in ethtool to have general
interface to provide timestamps counters? It may simplify things a lot.