netdev - Re: [PATCH net-next 00/13] Control action percpu counters allocation by netlink flag

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Date:   Tue, 22 Oct 2019 12:15:24 -0300
From:   Marcelo Ricardo Leitner <mleitner@...hat.com>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net, dcaratti@...hat.com
Subject: Re: [PATCH net-next 00/13] Control action percpu counters allocation
 by netlink flag

On Tue, Oct 22, 2019 at 05:17:51PM +0300, Vlad Buslov wrote:
> - Extend actions that are used for hardware offloads with optional
>   netlink 32bit flags field. Add TCA_ACT_FLAGS_FAST_INIT action flag and
>   update affected actions to not allocate percpu counters when the flag
>   is set.

I just went over all the patches and they mostly make sense to me. So
far the only point I'm uncertain of is the naming of the flag,
"fast_init".  That is not clear on what it does and can be overloaded
with other stuff later and we probably don't want that.

Say, for example, we want percpu counters but to disable allocating
the stats for hw, to make the counter in 28169abadb08 ("net/sched: Add
hardware specific counters to TC actions") optional.

So what about:
TCA_ACT_FLAGS_NO_PERCPU_STATS
TCA_ACT_FLAGS_NO_HW_STATS (this one to be done on a subsequent patchset, yes)
?

  Marcelo