netdev - RE: [patch net-next 3/5] net: sch: prio: Add offload ability to PRIO qdisc

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Date:   Thu, 11 Jan 2018 23:50:27 +0000
From:   Yuval Mintz <yuvalm@...lanox.com>
To:     Jakub Kicinski <kubakici@...pl>, Jiri Pirko <jiri@...nulli.us>
CC:     "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 3/5] net: sch: prio: Add offload ability to PRIO
 qdisc

> > +struct tc_prio_qopt_offload_params {
> > +	int bands;
> > +	u8 priomap[TC_PRIO_MAX + 1];
> > +	/* In case that a prio qdisc is offloaded and now is changed to a
> > +	 * non-offloadedable config, it needs to update the backlog value
> > +	 * to negate the HW backlog value.
> > +	 */
> > +	u32 *backlog;
> > +};
> 
> Could we please pass the full qstats on replace and destroy.  This
> simplifies the driver code and allows handling the qlen as well as
> backlog.  Please see the 2 patch series I sent earlier yesterday.

That might give the false impression that offloading driver is expected
to correct all the qstats fields during destruction, whereas for most of
them it doesn't seem appropriate.