2016-08-25 17:48:53 +02:00
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/*
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* \brief A net interface in form of a signal-driven NIC-packet handler
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* \author Martin Stein
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* \date 2016-08-24
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*/
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/*
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2017-02-20 13:23:52 +01:00
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* Copyright (C) 2016-2017 Genode Labs GmbH
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2016-08-25 17:48:53 +02:00
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*
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* This file is part of the Genode OS framework, which is distributed
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2017-02-20 13:23:52 +01:00
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* under the terms of the GNU Affero General Public License version 3.
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2016-08-25 17:48:53 +02:00
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*/
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#ifndef _INTERFACE_H_
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#define _INTERFACE_H_
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2016-09-12 12:55:12 +02:00
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/* local includes */
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#include <link.h>
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#include <arp_cache.h>
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#include <arp_waiter.h>
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2016-08-25 17:48:53 +02:00
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/* Genode includes */
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#include <nic_session/nic_session.h>
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namespace Net {
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2016-09-12 12:55:12 +02:00
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using Packet_descriptor = ::Nic::Packet_descriptor;
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using Packet_stream_sink = ::Nic::Packet_stream_sink< ::Nic::Session::Policy>;
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using Packet_stream_source = ::Nic::Packet_stream_source< ::Nic::Session::Policy>;
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class Forward_rule_tree;
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class Transport_rule_list;
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2016-08-25 17:48:53 +02:00
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class Ethernet_frame;
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class Arp_packet;
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class Interface;
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2016-09-12 12:55:12 +02:00
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class Configuration;
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class Domain;
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2016-08-25 17:48:53 +02:00
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}
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2016-09-12 12:55:12 +02:00
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class Net::Interface
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2016-08-25 17:48:53 +02:00
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{
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protected:
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2016-09-12 12:55:12 +02:00
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using Signal_handler = Genode::Signal_handler<Interface>;
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Signal_handler _sink_ack;
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Signal_handler _sink_submit;
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Signal_handler _source_ack;
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Signal_handler _source_submit;
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Mac_address const _router_mac;
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Mac_address const _mac;
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2016-08-25 17:48:53 +02:00
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private:
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os/timer: interpolate time via timestamps
Previously, the Genode::Timer::curr_time always used the
Timer_session::elapsed_ms RPC as back end. Now, Genode::Timer reads
this remote time only in a periodic fashion independently from the calls
to Genode::Timer::curr_time. If now one calls Genode::Timer::curr_time,
the function takes the last read remote time value and adapts it using
the timestamp difference since the remote-time read. The conversion
factor from timestamps to time is estimated on every remote-time read
using the last read remote-time value and the timestamp difference since
the last remote time read.
This commit also re-works the timeout test. The test now has two stages.
In the first stage, it tests fast polling of the
Genode::Timer::curr_time. This stage checks the error between locally
interpolated and timer-driver time as well as wether the locally
interpolated time is monotone and sufficiently homogeneous. In the
second stage several periodic and one-shot timeouts are scheduled at
once. This stage checks if the timeouts trigger sufficiently precise.
This commit adds the new Kernel::time syscall to base-hw. The syscall is
solely used by the Genode::Timer on base-hw as substitute for the
timestamp. This is because on ARM, the timestamp function uses the ARM
performance counter that stops counting when the WFI (wait for
interrupt) instruction is active. This instruction, however is used by
the base-hw idle contexts that get active when no user thread needs to
be scheduled. Thus, the ARM performance counter is not a good choice for
time interpolation and we use the kernel internal time instead.
With this commit, the timeout library becomes a basic library. That means
that it is linked against the LDSO which then provides it to the program it
serves. Furthermore, you can't use the timeout library anymore without the
LDSO because through the kernel-dependent LDSO make-files we can achieve a
kernel-dependent timeout implementation.
This commit introduces a structured Duration type that shall successively
replace the use of Microseconds, Milliseconds, and integer types for duration
values.
Open issues:
* The timeout test fails on Raspberry PI because of precision errors in the
first stage. However, this does not render the framework unusable in general
on the RPI but merely is an issue when speaking of microseconds precision.
* If we run on ARM with another Kernel than HW the timestamp speed may
continuously vary from almost 0 up to CPU speed. The Timer, however,
only uses interpolation if the timestamp speed remained stable (12.5%
tolerance) for at least 3 observation periods. Currently, one period is
100ms, so its 300ms. As long as this is not the case,
Timer_session::elapsed_ms is called instead.
Anyway, it might happen that the CPU load was stable for some time so
interpolation becomes active and now the timestamp speed drops. In the
worst case, we would now have 100ms of slowed down time. The bad thing
about it would be, that this also affects the timeout of the period.
Thus, it might "freeze" the local time for more than 100ms.
On the other hand, if the timestamp speed suddenly raises after some
stable time, interpolated time can get too fast. This would shorten the
period but nonetheless may result in drifting away into the far future.
Now we would have the problem that we can't deliver the real time
anymore until it has caught up because the output of Timer::curr_time
shall be monotone. So, effectively local time might "freeze" again for
more than 100ms.
It would be a solution to not use the Trace::timestamp on ARM w/o HW but
a function whose return value causes the Timer to never use
interpolation because of its stability policy.
Fixes #2400
2017-04-22 00:52:23 +02:00
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Timer::Connection &_timer;
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2016-09-12 12:55:12 +02:00
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Genode::Allocator &_alloc;
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Domain &_domain;
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Arp_cache _arp_cache;
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Arp_waiter_list _own_arp_waiters;
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Arp_waiter_list _foreign_arp_waiters;
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Link_side_tree _tcp_links;
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Link_side_tree _udp_links;
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Link_list _closed_tcp_links;
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Link_list _closed_udp_links;
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void _new_link(Genode::uint8_t const protocol,
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Link_side_id const &local_id,
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Pointer<Port_allocator_guard> const remote_port_alloc,
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Interface &remote_interface,
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Link_side_id const &remote_id);
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Forward_rule_tree &_forward_rules(Genode::uint8_t const prot) const;
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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Transport_rule_list &_transport_rules(Genode::uint8_t const prot) const;
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _handle_arp(Ethernet_frame ð, Genode::size_t const eth_size);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _handle_arp_reply(Arp_packet &arp);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _handle_arp_request(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Arp_packet &arp);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _handle_ip(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Packet_descriptor const &pkt);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _adapt_eth(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Ipv4_address const &ip,
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Packet_descriptor const &pkt,
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Interface &interface);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _nat_link_and_pass(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Ipv4_packet &ip,
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Genode::uint8_t const prot,
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void *const prot_base,
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Genode::size_t const prot_size,
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Link_side_id const &local_id,
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Interface &interface);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _broadcast_arp_request(Ipv4_address const &ip);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _send(Ethernet_frame ð, Genode::size_t const eth_size);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _pass_ip(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Ipv4_packet &ip,
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Genode::uint8_t const prot,
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void *const prot_base,
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Genode::size_t const prot_size);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _continue_handle_eth(Packet_descriptor const &pkt);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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Link_list &_closed_links(Genode::uint8_t const protocol);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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Link_side_tree &_links(Genode::uint8_t const protocol);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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Configuration &_config() const;
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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Ipv4_address const &_router_ip() const;
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _handle_eth(void *const eth_base,
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Genode::size_t const eth_size,
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Packet_descriptor const &pkt);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _ack_packet(Packet_descriptor const &pkt);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void _cancel_arp_waiting(Arp_waiter &waiter);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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virtual Packet_stream_sink &_sink() = 0;
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virtual Packet_stream_source &_source() = 0;
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2016-08-25 17:48:53 +02:00
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/***********************************
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** Packet-stream signal handlers **
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***********************************/
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2016-09-12 12:55:12 +02:00
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void _ready_to_submit();
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void _ack_avail() { }
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void _ready_to_ack();
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void _packet_avail() { }
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2016-08-25 17:48:53 +02:00
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public:
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2016-09-12 12:55:12 +02:00
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struct Bad_transport_protocol : Genode::Exception { };
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struct Bad_network_protocol : Genode::Exception { };
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struct Packet_postponed : Genode::Exception { };
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Interface(Genode::Entrypoint &ep,
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os/timer: interpolate time via timestamps
Previously, the Genode::Timer::curr_time always used the
Timer_session::elapsed_ms RPC as back end. Now, Genode::Timer reads
this remote time only in a periodic fashion independently from the calls
to Genode::Timer::curr_time. If now one calls Genode::Timer::curr_time,
the function takes the last read remote time value and adapts it using
the timestamp difference since the remote-time read. The conversion
factor from timestamps to time is estimated on every remote-time read
using the last read remote-time value and the timestamp difference since
the last remote time read.
This commit also re-works the timeout test. The test now has two stages.
In the first stage, it tests fast polling of the
Genode::Timer::curr_time. This stage checks the error between locally
interpolated and timer-driver time as well as wether the locally
interpolated time is monotone and sufficiently homogeneous. In the
second stage several periodic and one-shot timeouts are scheduled at
once. This stage checks if the timeouts trigger sufficiently precise.
This commit adds the new Kernel::time syscall to base-hw. The syscall is
solely used by the Genode::Timer on base-hw as substitute for the
timestamp. This is because on ARM, the timestamp function uses the ARM
performance counter that stops counting when the WFI (wait for
interrupt) instruction is active. This instruction, however is used by
the base-hw idle contexts that get active when no user thread needs to
be scheduled. Thus, the ARM performance counter is not a good choice for
time interpolation and we use the kernel internal time instead.
With this commit, the timeout library becomes a basic library. That means
that it is linked against the LDSO which then provides it to the program it
serves. Furthermore, you can't use the timeout library anymore without the
LDSO because through the kernel-dependent LDSO make-files we can achieve a
kernel-dependent timeout implementation.
This commit introduces a structured Duration type that shall successively
replace the use of Microseconds, Milliseconds, and integer types for duration
values.
Open issues:
* The timeout test fails on Raspberry PI because of precision errors in the
first stage. However, this does not render the framework unusable in general
on the RPI but merely is an issue when speaking of microseconds precision.
* If we run on ARM with another Kernel than HW the timestamp speed may
continuously vary from almost 0 up to CPU speed. The Timer, however,
only uses interpolation if the timestamp speed remained stable (12.5%
tolerance) for at least 3 observation periods. Currently, one period is
100ms, so its 300ms. As long as this is not the case,
Timer_session::elapsed_ms is called instead.
Anyway, it might happen that the CPU load was stable for some time so
interpolation becomes active and now the timestamp speed drops. In the
worst case, we would now have 100ms of slowed down time. The bad thing
about it would be, that this also affects the timeout of the period.
Thus, it might "freeze" the local time for more than 100ms.
On the other hand, if the timestamp speed suddenly raises after some
stable time, interpolated time can get too fast. This would shorten the
period but nonetheless may result in drifting away into the far future.
Now we would have the problem that we can't deliver the real time
anymore until it has caught up because the output of Timer::curr_time
shall be monotone. So, effectively local time might "freeze" again for
more than 100ms.
It would be a solution to not use the Trace::timestamp on ARM w/o HW but
a function whose return value causes the Timer to never use
interpolation because of its stability policy.
Fixes #2400
2017-04-22 00:52:23 +02:00
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Timer::Connection &timer,
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2016-09-12 12:55:12 +02:00
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Mac_address const router_mac,
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Genode::Allocator &alloc,
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Mac_address const mac,
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Domain &domain);
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2016-08-25 17:48:53 +02:00
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~Interface();
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2016-09-12 12:55:12 +02:00
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void link_closed(Link &link, Genode::uint8_t const prot);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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void dissolve_link(Link_side &link_side, Genode::uint8_t const prot);
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2016-08-25 17:48:53 +02:00
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2016-09-12 12:55:12 +02:00
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/*********
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** log **
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*********/
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void print(Genode::Output &output) const;
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2016-08-25 17:48:53 +02:00
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/***************
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** Accessors **
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***************/
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2016-09-12 12:55:12 +02:00
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Arp_waiter_list &own_arp_waiters() { return _own_arp_waiters; }
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Arp_waiter_list &foreign_arp_waiters() { return _foreign_arp_waiters; }
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2016-08-25 17:48:53 +02:00
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};
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#endif /* _INTERFACE_H_ */
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