netdev - Re: [PATCH v2 net-next 3/3] net/sched: sch_frag: add generic packet fragment support.

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Date:   Wed, 18 Nov 2020 16:04:45 +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>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net-next 3/3] net/sched: sch_frag: add generic packet
 fragment support.


在 2020/11/18 15:00, Cong Wang 写道:
> On Tue, Nov 17, 2020 at 5:37 PM <wenxu@...oud.cn> wrote:
>> From: wenxu <wenxu@...oud.cn>
>>
>> Currently kernel tc subsystem can do conntrack in cat_ct. But when several
>> fragment packets go through the act_ct, function tcf_ct_handle_fragments
>> will defrag the packets to a big one. But the last action will redirect
>> mirred to a device which maybe lead the reassembly big packet over the mtu
>> of target device.
>>
>> This patch add support for a xmit hook to mirred, that gets executed before
>> xmiting the packet. Then, when act_ct gets loaded, it configs that hook.
>> The frag xmit hook maybe reused by other modules.
>>
>> Signed-off-by: wenxu <wenxu@...oud.cn>
>> ---
>> v2: make act_frag just buildin for tc core but not a module
>>     return an error code from tcf_fragment
>>     depends on INET for ip_do_fragment
> Much better now.
>
>
>> +#ifdef CONFIG_INET
>> +               ret = ip_do_fragment(net, skb->sk, skb, sch_frag_xmit);
>> +#endif
>
> Doesn't the whole sch_frag need to be put under CONFIG_INET?
> I don't think fragmentation could work without CONFIG_INET.

I have already test with this. Without CONFIG_INET it is work.

And only the ip_do_fragment depends on CONFIG_INET

>
> Thanks.
>