linux-kernel - Re: [PATCH] Allow userspace code to use flag IFA_F_SECONDARY to specify an ip address to be primary or secondary ip on an interface

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Message-ID: <CAK3+h2y7v0i7AgK02GSy1apKKsi8n7is7U8oypx=uBf49Bubbg@mail.gmail.com>
Date:	Tue, 24 Sep 2013 13:46:41 -0700
From:	Vincent Li <vincent.mc.li@...il.com>
To:	David Miller <davem@...hat.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Allow userspace code to use flag IFA_F_SECONDARY to
 specify an ip address to be primary or secondary ip on an interface

Ok, I will resend the patch with your suggestions.

Vincent

On Tue, Sep 24, 2013 at 12:28 PM, David Miller <davem@...hat.com> wrote:
> From: Vincent Li <vincent.mc.li@...il.com>
> Date: Tue, 24 Sep 2013 11:11:21 -0700
>
>> the current behavior is when an IP is added to an interface, the primary
>> or secondary attributes is depending on the order of ip added to the interface
>> the first IP will be primary and second, third,... or alias IP will be secondary
>> if the IP subnet matches
>>
>> this patch add the flexiblity to allow user to specify an argument 'primary' or 'secondary'
>> (use 'ip addr add ip/mask primary|secondary dev ethX ' from iproute2 for example) to specify
>> an IP address to be  primary or secondary.
>>
>> the reason for this patch is that we have a multi blade cluster platform sharing 'floating management ip'
>> and also that each blade has its own management ip on the management interface, so whichever blade in the
>> cluster becomes primary blade, the 'floating mangaement ip' follows it, and we want any of our traffic
>> originated from the primary blade source from the 'floating management ip' for consistency. but in this
>> case, since the local blade management ip is always the primary ip on the mangaement interface and 'floating
>> management ip' is always secondary, kernel always choose the primary ip as source ip address. thus we would
>> like to add the flexibility in kernel to allow us to specify which ip to be primary or secondary.
>>
>> Signed-off-by: Vincent Li <vincent.mc.li@...il.com>
>
> When submitting a patch, please:
>
> 1) Specify an appropriate prefix for your subject line, indicating the
>    subsystem.  "ipv4: " might be appropriate here.
>
> 2) Format your commit message so that lines do not exceed 80 columns.
>    People will read using ASCII text based tools in 80 column
>    terminals.
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