netdev - Re: [patch net-next RFC 1/9] net_sch: red: Add offload ability to RED qdisc

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Date:   Mon, 30 Oct 2017 13:24:20 -0600
From:   David Ahern <dsahern@...il.com>
To:     Nogah Frankel <nogahf@...lanox.com>,
        David Miller <davem@...emloft.net>,
        "jiri@...nulli.us" <jiri@...nulli.us>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jhs@...atatu.com" <jhs@...atatu.com>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        mlxsw <mlxsw@...lanox.com>, "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        "ganeshgr@...lsio.com" <ganeshgr@...lsio.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>,
        "simon.horman@...ronome.com" <simon.horman@...ronome.com>,
        "pieter.jansenvanvuuren@...ronome.com" 
        <pieter.jansenvanvuuren@...ronome.com>,
        "john.hurley@...ronome.com" <john.hurley@...ronome.com>,
        "alexander.h.duyck@...el.com" <alexander.h.duyck@...el.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>
Subject: Re: [patch net-next RFC 1/9] net_sch: red: Add offload ability to RED
 qdisc

On 10/30/17 7:54 AM, Nogah Frankel wrote:
>>> diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
>>> index 0e88cc2..743c42a 100644
>>> --- a/include/uapi/linux/pkt_sched.h
>>> +++ b/include/uapi/linux/pkt_sched.h
>>> @@ -255,6 +255,7 @@ struct tc_red_qopt {
>>>  #define TC_RED_ECN		1
>>>  #define TC_RED_HARDDROP		2
>>>  #define TC_RED_ADAPTATIVE	4
>>> +#define TC_RED_OFFLOADED	8
>>>  };
>>>
>>>  struct tc_red_xstats {
>>
>> What keeps a user from setting this flag in the tc_red_qopt it
>> passes into the a change operation?
> 
> Nothing keeps the user from doing it, but it has no effect.
> The decision to offload is the driver's only.
> It is basically a read-only flag.
> 

If it is read-only, then attempts to set it from userspace should cause
the command to fail.