netdev - RE: [EXT] Re: [PATCH v1 net-next 3/3] net: dsa: felix: add support Credit Based Shaper(CBS) for hardware offload

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Date:   Tue, 12 May 2020 09:17:59 +0000
From:   Xiaoliang Yang <xiaoliang.yang_1@....com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Po Liu <po.liu@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Leo Li <leoyang.li@....com>, Mingkai Hu <mingkai.hu@....com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "jiri@...nulli.us" <jiri@...nulli.us>,
        "idosch@...sch.org" <idosch@...sch.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "horatiu.vultur@...rochip.com" <horatiu.vultur@...rochip.com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "allan.nielsen@...rochip.com" <allan.nielsen@...rochip.com>,
        "joergen.andreasen@...rochip.com" <joergen.andreasen@...rochip.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "nikolay@...ulusnetworks.com" <nikolay@...ulusnetworks.com>,
        "roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
        "linux-devel@...ux.nxdi.nxp.com" <linux-devel@...ux.nxdi.nxp.com>
Subject: RE: [EXT] Re: [PATCH v1 net-next 3/3] net: dsa: felix: add support
 Credit Based Shaper(CBS) for hardware offload

Hi Vinicius,


On Tue, 12 May 2020 9:42:23 Vinicius Costa Gomes wrote:
> > +
> > +     /* Rate unit is 100 kbps */
> > +     cir = DIV_ROUND_UP(cbs_qopt->idleslope, 100);
> > +     cir = (cir ? cir : 1);
> > +     cir = min_t(u32, GENMASK(14, 0), cir);
>
> Please rename 'cir' to "rate" or "idleslope".
>
> Also consider using clamp_t here and below (I just found out about it).
>
> > +     /* Burst unit is 4kB */
> > +     cbs = DIV_ROUND_UP(cbs_qopt->hicredit, 4096);
> > +     /* Avoid using zero burst size */
> > +     cbs = (cbs ? cbs : 1);
> > +     cbs = min_t(u32, GENMASK(5, 0), cbs);
> 
> And please(!) rename 'cbs' to "burst" or "hicredit". Re-using the name "cbs" with a completely different meaning here is confusing.
> 
I will update this, using clamp_t seems more concise in the codes.

Regards,
Xiaoliang