netdev - Re: [PATCH net-next v3 5/9] net/sched: support per action hw stats

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Message-ID: <20230210023237.skdiyav6rvn5tzmr@t14s.localdomain>
Date:   Thu, 9 Feb 2023 18:32:37 -0800
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Oz Shlomo <ozsh@...dia.com>
Cc:     netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Roi Dayan <roid@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        Marcelo Ricardo Leitner <mleitner@...hat.com>,
        Simon Horman <simon.horman@...igine.com>,
        Baowen Zheng <baowen.zheng@...igine.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Edward Cree <ecree.xilinx@...il.com>
Subject: Re: [PATCH  net-next v3 5/9] net/sched: support per action hw stats

On Mon, Feb 06, 2023 at 03:54:38PM +0200, Oz Shlomo wrote:
> There are currently two mechanisms for populating hardware stats:
> 1. Using flow_offload api to query the flow's statistics.
>    The api assumes that the same stats values apply to all
>    the flow's actions.
>    This assumption breaks when action drops or jumps over following
>    actions.
> 2. Using hw_action api to query specific action stats via a driver
>    callback method. This api assures the correct action stats for
>    the offloaded action, however, it does not apply to the rest of the
>    actions in the flow's actions array.
> 
> Extend the flow_offload stats callback to indicate that a per action
> stats update is required.
> Use the existing flow_offload_action api to query the action's hw stats.
> In addition, currently the tc action stats utility only updates hw actions.
> Reuse the existing action stats cb infrastructure to query any action
> stats.
> 
> Signed-off-by: Oz Shlomo <ozsh@...dia.com>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>

Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>