netdev - Re: [v1] net_sched: act_police: add 2 new attributes to support police 64bit rate and peakrate

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Message-ID: <7a8a5024-bbff-7443-71b3-9e3976af269f@gmail.com>
Date:   Thu, 29 Aug 2019 10:32:31 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Dai <zdai@...ux.vnet.ibm.com>, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     zdai@...ibm.com
Subject: Re: [v1] net_sched: act_police: add 2 new attributes to support
 police 64bit rate and peakrate



On 8/29/19 12:51 AM, David Dai wrote:
> For high speed adapter like Mellanox CX-5 card, it can reach upto
> 100 Gbits per second bandwidth. Currently htb already supports 64bit rate
> in tc utility. However police action rate and peakrate are still limited
> to 32bit value (upto 32 Gbits per second). Add 2 new attributes
> TCA_POLICE_RATE64 and TCA_POLICE_RATE64 in kernel for 64bit support
> so that tc utility can use them for 64bit rate and peakrate value to
> break the 32bit limit, and still keep the backward binary compatibility.
> 
> Tested-by: David Dai <zdai@...ux.vnet.ibm.com>
> Signed-off-by: David Dai <zdai@...ux.vnet.ibm.com>
> ---
>  include/uapi/linux/pkt_cls.h |    2 ++
>  net/sched/act_police.c       |   27 +++++++++++++++++++++++----
>  2 files changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
> index b057aee..eb4ea4d 100644
> --- a/include/uapi/linux/pkt_cls.h
> +++ b/include/uapi/linux/pkt_cls.h
> @@ -159,6 +159,8 @@ enum {
>  	TCA_POLICE_AVRATE,
>  	TCA_POLICE_RESULT,
>  	TCA_POLICE_TM,
> +	TCA_POLICE_RATE64,
> +	TCA_POLICE_PEAKRATE64,
>  	TCA_POLICE_PAD,
>  	__TCA_POLICE_MAX
>  #define TCA_POLICE_RESULT TCA_POLICE_RESULT

Never insert new attributes, as this breaks compatibility with old binaries (including
old kernels)

Keep TCA_POLICE_PAD value the same, thanks.