netdev - RE: [patch net-next 5/5] mlxsw: spectrum: qdiscs: Support stats for PRIO qdisc

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Date:   Fri, 12 Jan 2018 08:46:35 +0000
From:   Yuval Mintz <yuvalm@...lanox.com>
To:     Jakub Kicinski <kubakici@...pl>
CC:     Jiri Pirko <jiri@...nulli.us>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Nogah Frankel <nogahf@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Ido Schimmel <idosch@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
        "jhs@...atatu.com" <jhs@...atatu.com>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>
Subject: RE: [patch net-next 5/5] mlxsw: spectrum: qdiscs: Support stats for
 PRIO qdisc

> > > Hm.  You you need this just because you didn't add the backlog
> > > pointer to destroy?  AFAIK on destroy we are free to reset stats as
> > > well, thus simplifying your driver...  Let me know if I
> > > misunderstand.
> >
> > This is meant exactly for the scenario where qdisc didn't get
> > destroyed yet is no longer offloaded; E.g., if number of bands
> > increased beyond What we can offload. So we can't reset the
> > statistics in this case. [Although I might be the one to
> > misunderstand you, as the 'not destroyed' was explicitly mentioned
> > twice above]
> 
> I was trying to take some liberty with handling of destroy but your
> approach may actually end up being simpler.  I will withdraw my series
> for now and reuse your new callback once this series lands.
> 
> Do you have any objections to changing RED to behave more like prio
> (and other qdiscs) in principle?

>From statistics' perspective? None.