linux-kernel - Re: [PATCH RFC net-next v1 1/6] ethtool: add interface to read Tx hardware timestamping statistics

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Date: Mon, 26 Feb 2024 11:09:46 +0100
From: Köry Maincent <kory.maincent@...tlin.com>
To: Rahul Rameshbabu <rrameshbabu@...dia.com>
Cc: Saeed Mahameed <saeed@...nel.org>, Leon Romanovsky <leon@...nel.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>, Jonathan Corbet <corbet@....net>, Richard Cochran
 <richardcochran@...il.com>, Tariq Toukan <tariqt@...dia.com>, Gal Pressman
 <gal@...dia.com>, Vadim Fedorenko <vadim.fedorenko@...ux.dev>, Andrew Lunn
 <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Przemek Kitszel
 <przemyslaw.kitszel@...el.com>, Ahmed Zaki <ahmed.zaki@...el.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>, Hangbin Liu
 <liuhangbin@...il.com>, Paul Greenwalt <paul.greenwalt@...el.com>, Justin
 Stitt <justinstitt@...gle.com>, Randy Dunlap <rdunlap@...radead.org>,
 Maxime Chevallier <maxime.chevallier@...tlin.com>, Wojciech Drewek
 <wojciech.drewek@...el.com>, Vladimir Oltean <vladimir.oltean@....com>,
 Jiri Pirko <jiri@...nulli.us>, Jacob Keller <jacob.e.keller@...el.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
 <joabreu@...opsys.com>, Dragos Tatulea <dtatulea@...dia.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH RFC net-next v1 1/6] ethtool: add interface to read Tx
 hardware timestamping statistics

On Fri, 23 Feb 2024 11:24:45 -0800
Rahul Rameshbabu <rrameshbabu@...dia.com> wrote:

> Multiple network devices that support hardware timestamping appear to have
> common behavior with regards to timestamp handling. Implement common Tx
> hardware timestamping statistics in a tx_stats struct_group. Common Rx
> hardware timestamping statistics can subsequently be implemented in a
> rx_stats struct_group for ethtool_ts_stats.
> 
> Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
> Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>

> +
> +const struct nla_policy ethnl_stats_get_policy[__ETHTOOL_A_STATS_CNT] = {
> +	[ETHTOOL_A_STATS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
> +	[ETHTOOL_A_STATS_GROUPS] = { .type = NLA_NESTED },
> +	[ETHTOOL_A_STATS_SRC] =
>  		NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC),
> +	[ETHTOOL_A_STATS_LAYER] =
> +		NLA_POLICY_MAX(NLA_U32, ETHTOOL_TS_STATS_LAYER_PHY),
>  };

You should add this new netlink attributes to the specs in a new patch to be
able to test it.

diff --git a/Documentation/netlink/specs/ethtool.yaml
b/Documentation/netlink/specs/ethtool.yaml
index cfe48f8d6283..118508de2c88 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -859,6 +859,9 @@ attribute-sets:
       -
         name: src
         type: u32
+      -
+        name: layer
+        type: u32
   -
     name: phc-vclocks
     attributes:
@@ -1526,6 +1529,7 @@ operations:
           attributes:
             - header
             - groups
+            - layer
         reply:
           attributes:
             - header

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com