137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
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/*
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* \brief Block-session implementation for network devices
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* \author Sebastian Sumpf
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* \date 2012-07-05
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*/
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/*
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* Copyright (C) 2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _NIC__COMPONENT_H_
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#define _NIC__COMPONENT_H_
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#include <root/component.h>
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#include <nic_session/rpc_object.h>
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#include <signal/dispatch.h>
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namespace Nic {
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using namespace Genode;
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class Session_component;
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struct Device : ::Device
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{
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Session_component *_session;
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/**
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* Transmit data to driver
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*/
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virtual void tx(addr_t virt, size_t size) = 0;
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/**
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* Return mac address of device
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*/
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virtual Mac_address mac_address() = 0;
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/**
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* Set session belonging to this driver
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*/
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void session(Session_component *s) { _session = s; }
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};
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class Session_component : public Genode::Allocator_avl,
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public Packet_session_component<Session_rpc_object>
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{
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private:
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Device *_device; /* device this session is using */
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Tx::Sink *_tx_sink; /* client packet sink */
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protected:
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void _process_packets()
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{
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/* submit received packets to lower layer */
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while (_tx_sink->packet_avail())
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{
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Packet_descriptor packet = _tx_sink->get_packet();
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addr_t virt = (addr_t)_tx_sink->packet_content(packet);
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/* send to driver */
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_device->tx(virt, packet.size());
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if (!_tx_sink->ready_to_ack())
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PWRN("Wait for TX packet ack");
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/* acknowledge to client */
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_tx_sink->acknowledge_packet(packet);
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}
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/* release acknowledged packets */
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while (_rx.source()->ack_avail())
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{
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Packet_descriptor packet = _rx.source()->get_acked_packet();
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/* free packet buffer */
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_rx.source()->release_packet(packet);
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}
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}
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public:
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/**
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* Constructor
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*/
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Session_component(Dataspace_capability tx_ds,
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Dataspace_capability rx_ds,
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Rpc_entrypoint &ep,
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Signal_receiver *sig_rec,
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::Device *device)
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Genode::Allocator_avl(Genode::env()->heap()),
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Packet_session_component(tx_ds, rx_ds, this, ep, sig_rec),
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_device(static_cast<Device *>(device)),
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_tx_sink(Session_rpc_object::_tx.sink()) { _device->session(this); }
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Mac_address mac_address() { return _device->mac_address(); }
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/**
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* Send packet to client (called form driver)
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*/
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void rx(addr_t virt, size_t size)
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{
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Packet_descriptor p =_rx.source()->alloc_packet(size);
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memcpy(_rx.source()->packet_content(p), (void*)virt, size);
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_rx.source()->submit_packet(p);
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}
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};
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/*
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* Shortcut for single-client root component
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*/
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typedef Root_component<Session_component, Single_client> Root_component;
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/**
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* Root component, handling new session requests
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*/
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class Root : public Packet_root<Root_component, Session_component>
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{
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public:
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Root(Rpc_entrypoint *session_ep, Allocator *md_alloc,
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Signal_receiver *sig_rec, Device *device)
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:
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Packet_root(session_ep, md_alloc, sig_rec, device) { }
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};
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}
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#endif /* _NIC__COMPONENT_H_ */
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