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nic session: link-state change handling

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A Nic::Session client can install a signal handler that is used to
propagate changes of the link-state by calling 'link_state_sigh()'.
The actual link state is queried via 'link_state()'.

The nic-driver interface now provides a Driver_notification callback,
which is used to forward link-state changes from the driver to the
Nic::Session_component.

The following drivers now provide real link state: dde_ipxe, nic_bridge,
and usb_drv. Currently, OpenVPN, Linux nic_drv, and lan9118 do not
support link state and always report link up.

Fixes #1327
This commit is contained in:
Josef Söntgen
2015-03-11 11:33:03 +01:00
committed by Christian Helmuth
parent e4f6fca355
commit dd47129bef
21 changed files with 314 additions and 67 deletions
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26
repos/os/include/nic/component.h
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@ -39,13 +39,16 @@ namespace Nic {
class Nic::Session_component : public Genode::Allocator_avl,
public Session_rpc_object, public Rx_buffer_alloc
public Session_rpc_object, public Rx_buffer_alloc,
public Driver_notification
{
private:
Driver_factory &_driver_factory;
Driver &_driver;
Genode::Signal_context_capability _link_state_sigh;
/* rx packet descriptor */
Genode::Packet_descriptor _curr_rx_packet;
@ -126,7 +129,7 @@ class Nic::Session_component : public Genode::Allocator_avl,
Genode::env()->ram_session()->alloc(rx_buf_size),
static_cast<Genode::Range_allocator *>(this), ep),
_driver_factory(driver_factory),
_driver(*driver_factory.create(*this)),
_driver(*driver_factory.create(*this, *this)),
_tx_thread(_tx.sink(), _driver)
{ }
@ -138,12 +141,21 @@ class Nic::Session_component : public Genode::Allocator_avl,
_driver_factory.destroy(&_driver);
}
/***********************************
** Driver-notification interface **
***********************************/
void link_state_changed() override
{
if (_link_state_sigh.valid())
Genode::Signal_transmitter(_link_state_sigh).submit();
}
/*******************************
** Rx_buffer_alloc interface **
*******************************/
void *alloc(Genode::size_t size)
void *alloc(Genode::size_t size) override
{
/* assign rx packet descriptor */
_curr_rx_packet = _rx.source()->alloc_packet(size);
@ -151,7 +163,7 @@ class Nic::Session_component : public Genode::Allocator_avl,
return _rx.source()->packet_content(_curr_rx_packet);
}
void submit()
void submit() override
{
/* check for acknowledgements from the client */
while (_rx.source()->ack_avail()) {
@ -175,8 +187,14 @@ class Nic::Session_component : public Genode::Allocator_avl,
****************************/
Mac_address mac_address() { return _driver.mac_address(); }
bool link_state() { return _driver.link_state(); }
Tx::Sink* tx_sink() { return _tx.sink(); }
Rx::Source* rx_source() { return _rx.source(); }
void link_state_sigh(Genode::Signal_context_capability sigh) override
{
_link_state_sigh = sigh;
}
};