netdev - Re: [patch net-next v4 00/10] net: allow user specify TC action HW stats type

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Message-Id: <20200308.210912.1633299574639128341.davem@davemloft.net>
Date:   Sun, 08 Mar 2020 21:09:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jiri@...nulli.us
Cc:     netdev@...r.kernel.org, kuba@...nel.org, saeedm@...lanox.com,
        leon@...nel.org, michael.chan@...adcom.com, vishal@...lsio.com,
        jeffrey.t.kirsher@...el.com, idosch@...lanox.com,
        aelior@...vell.com, peppe.cavallaro@...com,
        alexandre.torgue@...com, jhs@...atatu.com,
        xiyou.wangcong@...il.com, pablo@...filter.org,
        ecree@...arflare.com, mlxsw@...lanox.com
Subject: Re: [patch net-next v4 00/10] net: allow user specify TC action HW
 stats type

From: Jiri Pirko <jiri@...nulli.us>
Date: Sat,  7 Mar 2020 12:40:10 +0100

> Currently, when user adds a TC action and the action gets offloaded,
> the user expects the HW stats to be counted and included in stats dump.
> However, since drivers may implement different types of counting, there
> is no way to specify which one the user is interested in.
> 
> For example for mlx5, only delayed counters are available as the driver
> periodically polls for updated stats.
> 
> In case of mlxsw, the counters are queried on dump time. However, the
> HW resources for this type of counters is quite limited (couple of
> thousands). This limits the amount of supported offloaded filters
> significantly. Without counter assigned, the HW is capable to carry
> millions of those.
> 
> On top of that, mlxsw HW is able to support delayed counters as well in
> greater numbers. That is going to be added in a follow-up patch.
> 
> This patchset allows user to specify one of the following types of HW
> stats for added action:
> immediate - queried during dump time
> delayed - polled from HW periodically or sent by HW in async manner
> disabled - no stats needed
> 
> Note that if "hw_stats" option is not passed, user does not care about
> the type, just expects any type of stats.
> 
> Examples:
 ...

Series applied, thanks Jiri.