genode/repos/os/include/nic_session/nic_session.h
2016-08-29 17:29:38 +02:00

124 lines
3.3 KiB
C++

/*
* \brief NIC session interface
* \author Norman Feske
* \date 2009-11-13
*/
/*
* Copyright (C) 2009-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__NIC_SESSION__NIC_SESSION_H_
#define _INCLUDE__NIC_SESSION__NIC_SESSION_H_
#include <dataspace/capability.h>
#include <base/signal.h>
#include <base/rpc.h>
#include <session/session.h>
#include <packet_stream_tx/packet_stream_tx.h>
#include <packet_stream_rx/packet_stream_rx.h>
#include <net/mac_address.h>
namespace Nic {
using Mac_address = Net::Mac_address;
struct Session;
using Genode::Packet_stream_sink;
using Genode::Packet_stream_source;
typedef Genode::Packet_descriptor Packet_descriptor;
}
/*
* NIC session interface
*
* A NIC session corresponds to a network adaptor, which can be used to
* transmit and receive network packets. Payload is communicated over the
* packet-stream interface set up between 'Session_client' and
* 'Session_server'.
*
* Even though the methods 'tx', 'tx_channel', 'rx', and 'rx_channel' are
* specific for the client side of the NIC session interface, they are part of
* the abstract 'Session' class to enable the client-side use of the NIC
* interface via a pointer to the abstract 'Session' class. This way, we can
* transparently co-locate the packet-stream server with the client in same
* program.
*/
struct Nic::Session : Genode::Session
{
enum { QUEUE_SIZE = 1024 };
/*
* Types used by the client stub code and server implementation
*
* The acknowledgement queue has always the same size as the submit
* queue. We access the packet content as a char pointer.
*/
typedef Genode::Packet_stream_policy<Genode::Packet_descriptor,
QUEUE_SIZE, QUEUE_SIZE, char> Policy;
typedef Packet_stream_tx::Channel<Policy> Tx;
typedef Packet_stream_rx::Channel<Policy> Rx;
static const char *service_name() { return "Nic"; }
virtual ~Session() { }
/**
* Request MAC address of network adapter
*/
virtual Mac_address mac_address() = 0;
/**
* Request packet-transmission channel
*/
virtual Tx *tx_channel() { return 0; }
/**
* Request packet-reception channel
*/
virtual Rx *rx_channel() { return 0; }
/**
* Request client-side packet-stream interface of tx channel
*/
virtual Tx::Source *tx() { return 0; }
/**
* Request client-side packet-stream interface of rx channel
*/
virtual Rx::Sink *rx() { return 0; }
/**
* Request current link state of network adapter (true means link detected)
*/
virtual bool link_state() = 0;
/**
* Register signal handler for link state changes
*/
virtual void link_state_sigh(Genode::Signal_context_capability sigh) = 0;
/*******************
** RPC interface **
*******************/
GENODE_RPC(Rpc_mac_address, Mac_address, mac_address);
GENODE_RPC(Rpc_tx_cap, Genode::Capability<Tx>, _tx_cap);
GENODE_RPC(Rpc_rx_cap, Genode::Capability<Rx>, _rx_cap);
GENODE_RPC(Rpc_link_state, bool, link_state);
GENODE_RPC(Rpc_link_state_sigh, void, link_state_sigh,
Genode::Signal_context_capability);
GENODE_RPC_INTERFACE(Rpc_mac_address, Rpc_link_state,
Rpc_link_state_sigh, Rpc_tx_cap, Rpc_rx_cap);
};
#endif /* _INCLUDE__NIC_SESSION__NIC_SESSION_H_ */