netdev - Re: [PATCH net-next v1 0/5] TC: Introduce qevents

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Date:   Mon, 29 Jun 2020 17:15:18 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     petrm@...lanox.com
Cc:     netdev@...r.kernel.org, kuba@...nel.org, xiyou.wangcong@...il.com,
        eric.dumazet@...il.com, jiri@...lanox.com, idosch@...lanox.com
Subject: Re: [PATCH net-next v1 0/5] TC: Introduce qevents

From: Petr Machata <petrm@...lanox.com>
Date: Sat, 27 Jun 2020 01:45:24 +0300

> The Spectrum hardware allows execution of one of several actions as a
> result of queue management decisions: tail-dropping, early-dropping,
> marking a packet, or passing a configured latency threshold or buffer
> size. Such packets can be mirrored, trapped, or sampled.
> 
> Modeling the action to be taken as simply a TC action is very attractive,
> but it is not obvious where to put these actions. At least with ECN marking
> one could imagine a tree of qdiscs and classifiers that effectively
> accomplishes this task, albeit in an impractically complex manner. But
> there is just no way to match on dropped-ness of a packet, let alone
> dropped-ness due to a particular reason.
> 
> To allow configuring user-defined actions as a result of inner workings of
> a qdisc, this patch set introduces a concept of qevents. Those are attach
> points for TC blocks, where filters can be put that are executed as the
> packet hits well-defined points in the qdisc algorithms. The attached
> blocks can be shared, in a manner similar to clsact ingress and egress
> blocks, arbitrary classifiers with arbitrary actions can be put on them,
> etc.
 ...

Series applied, thank you.