linux-kernel - Re: [PATCH v4 2/3] ipv4: Namespaceify tcp_fastopen

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Date:   Tue, 26 Sep 2017 11:18:51 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yanhaishuang@...s.chinamobile.com
Cc:     kuznet@....inr.ac.ru, edumazet@...gle.com, weiwan@...gle.com,
        lucab@...ian.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] ipv4: Namespaceify tcp_fastopen_key knob

From: 严海双 <yanhaishuang@...s.chinamobile.com>
Date: Tue, 26 Sep 2017 09:25:51 +0800

>> On 2017年9月26日, at 上午7:24, David Miller <davem@...emloft.net> wrote:
>> 
>> From: Haishuang Yan <yanhaishuang@...s.chinamobile.com>
>> Date: Fri, 22 Sep 2017 21:48:43 +0800
>> 
>>> @@ -9,13 +9,18 @@
>>> #include <net/inetpeer.h>
>>> #include <net/tcp.h>
>>> 
>>> -struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
>>> -
>>> -static DEFINE_SPINLOCK(tcp_fastopen_ctx_lock);
>>> -
>>> -void tcp_fastopen_init_key_once(bool publish)
>>> +void tcp_fastopen_init_key_once(struct net *net)
>> 
>> Why did you remove the 'publish' logic from this function?
>> 
> 
> I think this logic is not necessary now, in proc_tcp_fastopen_key, I have removed 
> tcp_fastopen_init_key_once(false) where the ‘publish’ is false:
> 
> -		/* Generate a dummy secret but don't publish it. This
> -		 * is needed so we don't regenerate a new key on the
> -		 * first invocation of tcp_fastopen_cookie_gen
> -		 */
> -		tcp_fastopen_init_key_once(false);
> -		tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
> +		tcp_fastopen_reset_cipher(net, user_key, TCP_FASTOPEN_KEY_LENGTH);
> 
> It said we don't regenerate a new key on first invocation of tcp_fastopen_cookie_gen, 
> but in tcp_fastopen_cookie_gen，it didn’t  call tcp_fastopen_init_key_once since
> from commit dfea2aa654243 (tcp: Do not call tcp_fastopen_reset_cipher from interrupt context)：
> 
> And in other places where call tcp_fastopen_init_key_once, the ‘publish’ is always true:

Ok, this simplification seems legitimate.

But it is unrelated to this namespacification.  So it should be in a separate patch,
and should be documented well in the commit message using the great explanation you
gave to me above.

Please respin this series, with this patch #2 split up into two changes.

Thank you.