netdev - Re: [net-next PATCH v4 0/3] net: reserve ports for applications using fixed port

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Message-ID: <4B7C1722.7040304@redhat.com>
Date:	Thu, 18 Feb 2010 00:19:46 +0800
From:	Cong Wang <amwang@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Octavian Purdila <opurdila@...acom.com>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [net-next PATCH v4 0/3] net: reserve ports for applications using
 fixed port

Eric W. Biederman wrote:
> Cong Wang <amwang@...hat.com> writes:
> 
>> Octavian Purdila wrote:
>>> On Tuesday 16 February 2010 22:08:13 you wrote:
>>>>> Something like bellow?
>>>>>
>>>>> # set bits 8080 and 1666
>>>>> $echo 8080 1666-1666 > /proc
>>>>>
>>>>> #reset bit 1666
>>>>> $echo 8080 > /proc
>>>>>
>>>>> #reset whole bitmap
>>>>> $echo > /proc
>>>> Yes. So something like that.
>>>>
>>>> I think I would use commas instead of spaces as that is more traditional.
>>
>> Why this is better than the current version?
>>
>> For the single port case, currently we use:
>>
>> echo +8080 > /xxxx #set
>> echo -8080 > /xxxx #clear
>>
>> Now we will use:
>>
>> echo 8080 > /xxxx #set
>> echo 8080 > /xxxx #clear
> 
> No.
> 
>> I don't think the latter is better...
>>
>> For the multi-port case, yes, we should accept 'echo 8080,10000 >/xxxx'.
> 
> What I was envisioning was:
> 
> echo 8080 > /xxx # set the bitmap to 8080
> echo 8080,10000 > /xxx # add 10000 to the bitmap
> echo 8080 > /xxxx # remove 10000 from the bitmap.
> 
> That is when you set it you enter the entire set every time, treating
> the entire set as a single value.
> 

Oh, I see, this is ok.

But if we could support multi-port, that will be better, something like:

echo '8080,10000-11000' > /xxx #add port 8080 and port range 10000-11000

so that I don't have to construct a long string for all ports within
10000 and 11000.

Thanks.

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