Re: [PATCH] auto setup network without netroot

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On 01/30/2012 06:03 PM, Cong Wang wrote:

> On 01/30/2012 05:49 PM, Dave Young wrote:
>> On 01/30/2012 05:31 PM, Cong Wang wrote:
>>> On 01/30/2012 05:16 PM, Dave Young wrote:
>>>> How to say...
>>>> There's many different configs for network like:
>>>> 1. ip={dhcp|on|any|dhcp6|auto6|ibft}
>>>> 2. ip=<interface>:{dhcp|on|any|dhcp6|auto6}
>>>> 3. ip=<client-IP>:[<server-id>
>>>> ]:<gateway-IP>:<netmask>:<client_hostname>:<interface>:{none|off}
>>>> 4. ifname=
>>>> 5. bootdev=
>>>> 6. root=nfs:[snip]
>>>> They are all possibly be used, IHMO they are not good options for this
>>>> patch using. For example there's no NIC specified in 1 and 3, we will
>>>> still have to bring up the default
>>> Kdump module can make sure that at least one NIC will be specified, if
>>> there is ip=.
>>>> Also this is a general feature, maybe it will be used by users other
>>>> than kdump. For kdump I think we can use proper ip= plus rd.neednet=1
>>> Why? If we can re-use ip=, it will imply rd.neednet=1, so again,
>>> rd.neednet is not needed.
>> why choose ip=? what if user pass ifname= or bootdev= without ip=? I
> For kdump, ip= is the one we need, it has the NIC, and dhcp etc,
> everything we need to bring up an NIC.
> If ifname= or bootdev= is provided but no ip=, we can just bring the NIC
> up without assigning any IP address.
>> want to benefit to other user as well, from semantic point of view one
>> global switch like rd.neednet is more clear then reuse the various other
>> options.
> I can't agree, only specifying ip= also means bringing up network
> apparently.

Harald, what's your opnion? especially about the previous patch to allow
manually bring up network with like 'ifup eth0 -m'? Can you give comments?

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