netdev - Re: [PATCH v10 net-next 3/3] net/sched: act_frag: add implict packet fragment support.

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Message-ID: <7f897550-119f-e149-3c9d-cf2eb8964d63@ucloud.cn>
Date:   Wed, 18 Nov 2020 07:21:10 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Vlad Buslov <vladbu@...dia.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH v10 net-next 3/3] net/sched: act_frag: add implict packet
 fragment support.


在 2020/11/18 6:43, Cong Wang 写道:
> On Mon, Nov 16, 2020 at 8:06 PM wenxu <wenxu@...oud.cn> wrote:
>>
>> On 11/17/2020 3:01 AM, Cong Wang wrote:
>>> On Sun, Nov 15, 2020 at 5:06 AM wenxu <wenxu@...oud.cn> wrote:
>>>> 在 2020/11/15 2:05, Cong Wang 写道:
>>>>> On Wed, Nov 11, 2020 at 9:44 PM <wenxu@...oud.cn> wrote:
>>>>>> diff --git a/net/sched/act_frag.c b/net/sched/act_frag.c
>>>>>> new file mode 100644
>>>>>> index 0000000..3a7ab92
>>>>>> --- /dev/null
>>>>>> +++ b/net/sched/act_frag.c
>>>>> It is kinda confusing to see this is a module. It provides some
>>>>> wrappers and hooks the dev_xmit_queue(), it belongs more to
>>>>> the core tc code than any modularized code. How about putting
>>>>> this into net/sched/sch_generic.c?
>>>>>
>>>>> Thanks.
>>>> All the operations in the act_frag  are single L3 action.
>>>>
>>>> So we put in a single module. to keep it as isolated/contained as possible
>>> Yeah, but you hook dev_queue_xmit() which is L2.
>>>
>>>> Maybe put this in a single file is better than a module? Buildin in the tc core code or not.
>>>>
>>>> Enable this feature in Kconifg with NET_ACT_FRAG?
>>> Sort of... If this is not an optional feature, that is a must-have
>>> feature for act_ct,
>>> we should just get rid of this Kconfig.
>>>
>>> Also, you need to depend on CONFIG_INET somewhere to use the IP
>>> fragment, no?
>>>
>>> Thanks.
>> Maybe the act_frag should rename to sch_frag and buildin kernel.
> sch_frag still sounds like a module. ;) This is why I proposed putting
> it into sch_generic.c.
>
>> This fcuntion can be used for all tc subsystem. There is no need for
>>
>> CONFIG_INET. The sched system depends on NET.
> CONFIG_INET is different from CONFIG_NET, right?

you are right. ip_do_fragment depends on this!

>
> Thanks.
>