Mon, Oct 05, 2015 at 07:43:23PM CEST, john.fastab...@gmail.com wrote:
>On 15-10-05 10:24 AM, Jiri Pirko wrote:
>> Mon, Oct 05, 2015 at 07:07:30PM CEST, john.fastab...@gmail.com wrote:
>>
>> <snip>
>>
>>>>
>>>> Again, to make this clear, worlds are not just a rehash of tables.
>>>>
>>>
>>> what are they then? Lets model those bits and let users configure them
>>> at runtime.
>>>
>>> So far I've had really good results modelling hardware as a 'parser',
>>> a set of tables, and a set of modify blocks. Now this breaks when you
>>> start to add black boxes in there for other functions such as encryption
>>> but I don't think your getting at that. Do you see something that
>>> couldn't be configured/modelled with those blocks?
>>
>> How about an arbitrary BPF program? I can implement world that bases
>> mangling/forwarding packets on intensity of gravitational field.
>> Rocker hw is very free in that and cannot be pushed down to "table boxes".
>>
>> That is making it a wild animal and challenges us to wrap it up in
>> kernel, somehow.
>>
>
>Just for fun ;)
>
>I would model this as a parser that matches on gravitational field and
>and an action that does mangling/forwarding.
>
>So a table,
>
> table { name "gravitational_field_table",
> id 10,
> size 1024,
> matches {(gfield,mask)},
> actions {mangle, forward},
> }
>
>rules would look like,
>
> match (gfield=0x1000, mask(0xff00)) -> action (mangle), action(forward)
>
>The user can populate these tables using some interface, the ebpf maps
>API looks nice and then programs running against hardware and software
>use the same API. Or the hardware could populate the table using a
>learning algorithm of some sort. Also you could push your bpf program
>to user space via an API so that we can create a software equiv of your
>hardware.
>
>I think we can tame the wild animal a bit by scoping it to the set of
>useful bpf programs. I guess we can argue about what useful is in this
>context. I'm going to argue forwarding by gravitational fields is going
>to be not so useful in practice.
Push into tables whatever you want, but please, leave our beloved
rocker out of it :)
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