Change of session name at runtime

[Ivan Loskutov]

Hello Norman,

> have you had a look at conditional session routes using '<if-args>'?
> Admittedly, it is not very well documented. Let's have a look at the the
> example given here:
>
>  http://genode.org/documentation/release-notes/11.11#Stub-driver_support
>
> In this example, one instance of L4Linux uses two block sessions that
> should be routed to different servers. Using the '<if-arg>' node, the
> routing is made depending on the label of the session ("l4android ->
> sda" versus "l4android -> sdb"). L4Linux just passes the label "sda" or
>"sdb" as argument to the 'Block::Connection' constructor. Couldn't a
> similar scheme work also for routing multiple Nic sessions to different
> Nic services? If you think so, we could add a label constructor argument
>to 'Nic::Connection', too.

Thank you for reference. I think '<if-arg>' mechanism is the good solution
and it can be solve my issue. I'll try to implement it today.


> There is currently no support for more than one NIC. In the presence of
> multiple networking adapters, we need a way to tell the driver, which
> NIC to use (e.g., using <config> parameters).

Yes, I have implemented selecting NIC device by driver <config>.

> I wonder about your IRQ problems. Having multiple devices to share one
> IRQ is expected to work. Maybe, your IRQ issues stem from a missing ACPI
> driver?

I have tried ACPI driver, but it didn't work in qemu and on my test PC.

--
Ivan Loskutov



2013/1/28 Norman Feske <norman.feske at ...1...>

> Hi Ivan,
>
> have you had a look at conditional session routes using '<if-args>'?
> Admittedly, it is not very well documented. Let's have a look at the the
> example given here:
>
>   http://genode.org/documentation/release-notes/11.11#Stub-driver_support
>
> In this example, one instance of L4Linux uses two block sessions that
> should be routed to different servers. Using the '<if-arg>' node, the
> routing is made depending on the label of the session ("l4android ->
> sda" versus "l4android -> sdb"). L4Linux just passes the label "sda" or
> "sdb" as argument to the 'Block::Connection' constructor. Couldn't a
> similar scheme work also for routing multiple Nic sessions to different
> Nic services? If you think so, we could add a label constructor argument
> to 'Nic::Connection', too.
>
> Heads-up warning: Recently, I slightly changed the label matching
> implementation of the '<if-arg>' mechanism. See here:
>
>
>
> https://github.com/genodelabs/genode/commit/277af913765f7e82b0f2a236e6b390ba4f450b6c
>
> So with the new version, the matching string would be just "sda" instead
> of "l4andriod -> sda".
>
> > *I’m trying to implement virtual network between two instances of the
> > L4Linux. Moreover, each L4Linux has access to own ethernet controller.
> > Genode hasn’t support two NIC drivers yet. It not work because each NIC
> try
> > to use one IRQ and interrupt handler doesn't work correct. It can be
> solved
> > by remapping PCI interrupts. The interrupt handler was temporarily moved
> to
> > PCI driver. But it isn’t a good solution.
>
> There is currently no support for more than one NIC. In the presence of
> multiple networking adapters, we need a way to tell the driver, which
> NIC to use (e.g., using <config> parameters).
>
> I wonder about your IRQ problems. Having multiple devices to share one
> IRQ is expected to work. Maybe, your IRQ issues stem from a missing ACPI
> driver?
>
> > ...
> > I think it would be nice to have session name can be changed in the
> config
> > like binary executable name and session name for connection can be
> > specified at runtime. This may look like:
> > config: <provides> <service name=”Nic2” base_name=”Nic”/></provides>
> > and source: Nic::Connection nic(“Nic2”);
> > Is it possible? Maybe you have another solution?*
>
> I would appreciate your feedback on how the '<if-arg>' mechanism works
> for you. At the first glance, I looks simpler than the introduction of
> aliases for service names. What do you think?
>
> Cheers
> Norman
>
> --
> Dr.-Ing. Norman Feske
> Genode Labs
>
> http://www.genode-labs.com · http://genode.org
>
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>
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