220 lines
6.0 KiB
C++
220 lines
6.0 KiB
C++
/*
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* \brief Simple loop-back pseudo network adaptor
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* \author Norman Feske
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* \date 2009-11-13
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*
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* This program showcases the server-side use of the 'Nic_session' interface.
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*/
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/*
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* Copyright (C) 2009-2013 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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#include <base/env.h>
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#include <base/sleep.h>
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#include <cap_session/connection.h>
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#include <root/component.h>
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#include <util/arg_string.h>
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#include <util/misc_math.h>
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#include <nic_session/rpc_object.h>
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#include <nic_session/client.h>
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#include <timer_session/connection.h>
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namespace Nic {
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class Communication_buffer : Genode::Ram_dataspace_capability
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{
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public:
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Communication_buffer(Genode::size_t size)
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: Genode::Ram_dataspace_capability(Genode::env()->ram_session()->alloc(size))
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{ }
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~Communication_buffer() { Genode::env()->ram_session()->free(*this); }
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Genode::Dataspace_capability dataspace() { return *this; }
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};
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class Tx_rx_communication_buffers
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{
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private:
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Communication_buffer _tx_buf, _rx_buf;
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public:
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Tx_rx_communication_buffers(Genode::size_t tx_size,
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Genode::size_t rx_size)
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: _tx_buf(tx_size), _rx_buf(rx_size) { }
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Genode::Dataspace_capability tx_ds() { return _tx_buf.dataspace(); }
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Genode::Dataspace_capability rx_ds() { return _rx_buf.dataspace(); }
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};
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enum { STACK_SIZE = 8*1024 };
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class Session_component : private Genode::Allocator_avl,
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private Tx_rx_communication_buffers,
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private Genode::Thread<STACK_SIZE>,
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public Session_rpc_object
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{
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private:
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/**
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* Packet-handling thread
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*/
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void entry()
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{
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using namespace Genode;
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for (;;) {
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Packet_descriptor packet_from_client, packet_to_client;
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/* get packet, block until a packet is available */
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packet_from_client = _tx.sink()->get_packet();
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if (!packet_from_client.valid()) {
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PWRN("received invalid packet");
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continue;
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}
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size_t packet_size = packet_from_client.size();
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try {
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packet_to_client = _rx.source()->alloc_packet(packet_size);
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Genode::memcpy(_rx.source()->packet_content(packet_to_client),
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_tx.sink()->packet_content(packet_from_client),
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packet_size);
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_rx.source()->submit_packet(packet_to_client);
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} catch (Session::Rx::Source::Packet_alloc_failed) {
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PWRN("transmit packet allocation failed, drop packet");
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}
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if (!_tx.sink()->ready_to_ack())
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printf("need to wait until ready-for-ack\n");
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_tx.sink()->acknowledge_packet(packet_from_client);
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/* flush acknowledgements for the echoes packets */
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while (_rx.source()->ack_avail())
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_rx.source()->release_packet(_rx.source()->get_acked_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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* \param tx_buf_size buffer size for tx channel
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* \param rx_buf_size buffer size for rx channel
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* \param rx_block_md_alloc backing store of the meta data of the
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* rx block allocator
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* \param ep entry point used for packet stream
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* channels
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*/
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Session_component(Genode::size_t tx_buf_size,
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Genode::size_t rx_buf_size,
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Genode::Allocator *rx_block_md_alloc,
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Genode::Rpc_entrypoint &ep)
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:
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Genode::Allocator_avl(rx_block_md_alloc),
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Tx_rx_communication_buffers(tx_buf_size, rx_buf_size),
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Thread("nic_packet_handler"),
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Session_rpc_object(Tx_rx_communication_buffers::tx_ds(),
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Tx_rx_communication_buffers::rx_ds(),
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static_cast<Genode::Range_allocator *>(this), ep)
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{
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/* start packet-handling thread */
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start();
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}
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Mac_address mac_address()
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{
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Mac_address result = {{1,2,3,4,5,6}};
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return result;
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}
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bool link_state()
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{
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/* XXX always return true, for now */
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return true;
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}
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void link_state_sigh(Genode::Signal_context_capability sigh) { }
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};
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class Root : public Genode::Root_component<Session_component>
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{
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private:
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Genode::Rpc_entrypoint &_channel_ep;
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protected:
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Session_component *_create_session(const char *args)
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{
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using namespace Genode;
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size_t ram_quota = Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
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size_t tx_buf_size = Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
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size_t rx_buf_size = Arg_string::find_arg(args, "rx_buf_size").ulong_value(0);
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/* deplete ram quota by the memory needed for the session structure */
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size_t session_size = max(4096UL, (unsigned long)sizeof(Session_component));
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if (ram_quota < session_size)
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throw Root::Quota_exceeded();
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/*
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* Check if donated ram quota suffices for both communication
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* buffers. Also check both sizes separately to handle a
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* possible overflow of the sum of both sizes.
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*/
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if (tx_buf_size > ram_quota - session_size
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|| rx_buf_size > ram_quota - session_size
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|| tx_buf_size + rx_buf_size > ram_quota - session_size) {
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PERR("insufficient 'ram_quota', got %zd, need %zd",
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ram_quota, tx_buf_size + rx_buf_size + session_size);
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throw Root::Quota_exceeded();
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}
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return new (md_alloc()) Session_component(tx_buf_size, rx_buf_size,
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env()->heap(), _channel_ep);
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}
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public:
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Root(Genode::Rpc_entrypoint *session_ep,
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Genode::Allocator *md_alloc)
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:
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Genode::Root_component<Session_component>(session_ep, md_alloc),
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_channel_ep(*session_ep)
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{ }
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};
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}
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using namespace Genode;
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int main(int, char **)
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{
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enum { STACK_SIZE = 2*4096 };
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static Cap_connection cap;
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "nicloop_ep");
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static Nic::Root nic_root(&ep, env()->heap());
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env()->parent()->announce(ep.manage(&nic_root));
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sleep_forever();
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return 0;
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}
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