linux-kernel - Re: [v2] net_sched: act_police: add 2 new attributes to support police 64bit rate and peakrate

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Date:   Fri, 30 Aug 2019 13:09:29 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     "David Z. Dai" <zdai@...ux.vnet.ibm.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, zdai@...ibm.com
Subject: Re: [v2] net_sched: act_police: add 2 new attributes to support
 police 64bit rate and peakrate

On Fri, Aug 30, 2019 at 1:03 PM David Z. Dai <zdai@...ux.vnet.ibm.com> wrote:
>
> On Fri, 2019-08-30 at 12:11 -0700, Cong Wang wrote:
> > On Fri, Aug 30, 2019 at 12:06 PM David Dai <zdai@...ux.vnet.ibm.com> wrote:
> > > -       if (p->peak_present)
> > > +               if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
> > > +                   nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
> > > +                                     police->params->rate.rate_bytes_ps,
> > > +                                     __TCA_POLICE_MAX))
> >
> > I think the last parameter should be TCA_POLICE_PAD.
> Thanks for reviewing it!
> I have the impression that last parameter num value should be larger
> than the attribute num value in 2nd parameter (TC_POLICE_RATE64 in this

Why do you have this impression?

> case). This is the reason I changed the last parameter value to
> __TCA_POLICE_MAX after I moved the new attributes after TC_POLICE_PAD in
> pkt_cls.h header.

The prototype clearly shows it must be a padding attribute:

static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
                                    u64 value, int padattr)