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nic_loopback: API transition

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Ref #1987
This commit is contained in:
Norman Feske
2017-01-04 18:01:30 +01:00
parent 7a0bcbbccb
commit a9eecc1a2d
3 changed files with 355 additions and 193 deletions
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104
repos/os/src/server/nic_loopback/main.cc
View File

@ -13,26 +13,24 @@
* under the terms of the GNU General Public License version 2. * under the terms of the GNU General Public License version 2.
*/ */
#include <base/env.h> #include <base/component.h>
#include <base/sleep.h> #include <base/heap.h>
#include <os/server.h>
#include <root/component.h> #include <root/component.h>
#include <util/arg_string.h> #include <util/arg_string.h>
#include <util/misc_math.h> #include <util/misc_math.h>
#include <nic/component.h> #include <nic/component.h>
#include <nic/packet_allocator.h> #include <nic/packet_allocator.h>
namespace Nic { namespace Nic_loopback {
class Session_component;
class Loopback_component;
class Root; class Root;
class Main;
using namespace Genode;
} }
namespace Server { struct Main; } class Nic_loopback::Session_component : public Nic::Session_component
class Nic::Loopback_component : public Nic::Session_component
{ {
public: public:
@ -47,19 +45,20 @@ class Nic::Loopback_component : public Nic::Session_component
* \param ep entry point used for packet stream * \param ep entry point used for packet stream
* channels * channels
*/ */
Loopback_component(Genode::size_t const tx_buf_size, Session_component(size_t const tx_buf_size,
Genode::size_t const rx_buf_size, size_t const rx_buf_size,
Genode::Allocator &rx_block_md_alloc, Allocator &rx_block_md_alloc,
Genode::Ram_session &ram_session, Ram_session &ram_session,
Server::Entrypoint &ep) Entrypoint &ep)
: Session_component(tx_buf_size, rx_buf_size, :
rx_block_md_alloc, ram_session, ep) Nic::Session_component(tx_buf_size, rx_buf_size, rx_block_md_alloc,
ram_session, ep)
{ } { }
Mac_address mac_address() override Nic::Mac_address mac_address() override
{ {
char buf[] = {1,2,3,4,5,6}; char buf[] = {1,2,3,4,5,6};
Mac_address result((void*)buf); Nic::Mac_address result((void*)buf);
return result; return result;
} }
@ -73,13 +72,11 @@ class Nic::Loopback_component : public Nic::Session_component
}; };
void Nic::Loopback_component::_handle_packet_stream() void Nic_loopback::Session_component::_handle_packet_stream()
{ {
using namespace Genode; size_t const alloc_size = Nic::Packet_allocator::DEFAULT_PACKET_SIZE;
unsigned const alloc_size = Nic::Packet_allocator::DEFAULT_PACKET_SIZE; /* loop while we can make progress */
/* loop unless we cannot make any progress */
for (;;) { for (;;) {
/* flush acknowledgements for the echoes packets */ /* flush acknowledgements for the echoes packets */
@ -118,20 +115,19 @@ void Nic::Loopback_component::_handle_packet_stream()
Packet_descriptor packet_to_client; Packet_descriptor packet_to_client;
try { try {
packet_to_client = _rx.source()->alloc_packet(alloc_size); packet_to_client = _rx.source()->alloc_packet(alloc_size); }
} catch (Session::Rx::Source::Packet_alloc_failed) { catch (Session::Rx::Source::Packet_alloc_failed) {
continue; continue; }
}
/* obtain packet */ /* obtain packet */
Packet_descriptor const packet_from_client = _tx.sink()->get_packet(); Packet_descriptor const packet_from_client = _tx.sink()->get_packet();
if (!packet_from_client.size()) { if (!packet_from_client.size()) {
Genode::warning("received zero-size packet"); warning("received zero-size packet");
_rx.source()->release_packet(packet_to_client); _rx.source()->release_packet(packet_to_client);
continue; continue;
} }
Genode::memcpy(_rx.source()->packet_content(packet_to_client), memcpy(_rx.source()->packet_content(packet_to_client),
_tx.sink()->packet_content(packet_from_client), _tx.sink()->packet_content(packet_from_client),
packet_from_client.size()); packet_from_client.size());
@ -144,24 +140,23 @@ void Nic::Loopback_component::_handle_packet_stream()
} }
class Nic::Root : public Genode::Root_component<Loopback_component> class Nic_loopback::Root : public Root_component<Session_component>
{ {
private: private:
Server::Entrypoint &_ep; Entrypoint &_ep;
Ram_session &_ram;
protected: protected:
Loopback_component*_create_session(const char *args) Session_component *_create_session(char const *args)
{ {
using namespace Genode;
size_t ram_quota = Arg_string::find_arg(args, "ram_quota" ).ulong_value(0); size_t ram_quota = Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
size_t tx_buf_size = Arg_string::find_arg(args, "tx_buf_size").ulong_value(0); size_t tx_buf_size = Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
size_t rx_buf_size = Arg_string::find_arg(args, "rx_buf_size").ulong_value(0); size_t rx_buf_size = Arg_string::find_arg(args, "rx_buf_size").ulong_value(0);
/* deplete ram quota by the memory needed for the session structure */ /* deplete ram quota by the memory needed for the session structure */
size_t session_size = max(4096UL, (unsigned long)sizeof(Session_component)); size_t session_size = max(4096UL, (size_t)sizeof(Session_component));
if (ram_quota < session_size) if (ram_quota < session_size)
throw Root::Quota_exceeded(); throw Root::Quota_exceeded();
@ -171,48 +166,39 @@ class Nic::Root : public Genode::Root_component<Loopback_component>
*/ */
if (tx_buf_size + rx_buf_size < tx_buf_size || if (tx_buf_size + rx_buf_size < tx_buf_size ||
tx_buf_size + rx_buf_size > ram_quota - session_size) { tx_buf_size + rx_buf_size > ram_quota - session_size) {
Genode::error("insufficient 'ram_quota', got ", ram_quota, ", " error("insufficient 'ram_quota', got ", ram_quota, ", "
"need ", tx_buf_size + rx_buf_size + session_size); "need ", tx_buf_size + rx_buf_size + session_size);
throw Root::Quota_exceeded(); throw Root::Quota_exceeded();
} }
return new (md_alloc()) Loopback_component(tx_buf_size, rx_buf_size, return new (md_alloc()) Session_component(tx_buf_size, rx_buf_size,
*env()->heap(), *md_alloc(), _ram, _ep);
*env()->ram_session(),
_ep);
} }
public: public:
Root(Server::Entrypoint &ep, Genode::Allocator &md_alloc) Root(Entrypoint &ep, Ram_session &ram, Allocator &md_alloc)
: :
Genode::Root_component<Loopback_component>(&ep.rpc_ep(), &md_alloc), Root_component<Session_component>(&ep.rpc_ep(), &md_alloc),
_ep(ep) _ep(ep), _ram(ram)
{ } { }
}; };
struct Server::Main struct Nic_loopback::Main
{ {
Entrypoint &ep; Env &_env;
Nic::Root nic_root { ep, *Genode::env()->heap() }; Heap _heap { _env.ram(), _env.rm() };
Main(Entrypoint &ep) : ep(ep) Nic_loopback::Root _root { _env.ep(), _env.ram(), _heap };
Main(Env &env) : _env(env)
{ {
Genode::env()->parent()->announce(ep.manage(nic_root)); _env.parent().announce(_env.ep().manage(_root));
} }
}; };
namespace Server { void Component::construct(Genode::Env &env) { static Nic_loopback::Main main(env); }
char const *name() { return "nicloop_ep"; }
size_t stack_size() { return 16*1024*sizeof(long); }
void construct(Entrypoint &ep)
{
static Main main(ep);
}
}

2
repos/os/src/server/nic_loopback/target.mk
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@ -1,3 +1,3 @@
TARGET = nic_loopback TARGET = nic_loopback
SRC_CC = main.cc SRC_CC = main.cc
LIBS = base server LIBS = base

416
repos/os/src/test/nic_loopback/main.cc
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@ -5,192 +5,368 @@
*/ */
/* /*
* Copyright (C) 2009-2013 Genode Labs GmbH * Copyright (C) 2009-2016 Genode Labs GmbH
* *
* This file is part of the Genode OS framework, which is distributed * This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2. * under the terms of the GNU General Public License version 2.
*/ */
#include <base/component.h>
#include <base/log.h> #include <base/log.h>
#include <base/heap.h>
#include <base/allocator_avl.h> #include <base/allocator_avl.h>
#include <nic_session/connection.h> #include <nic_session/connection.h>
#include <nic/packet_allocator.h> #include <nic/packet_allocator.h>
#include <timer_session/connection.h>
namespace Test {
struct Base;
struct Roundtrip;
struct Batch;
struct Main;
using namespace Genode;
}
namespace Genode { namespace Genode {
static inline void print(Output &out, Packet_descriptor packet) static void print(Output &out, Packet_descriptor const &packet)
{ {
Genode::print(out, "offset=", packet.offset(), ", size=", packet.size()); ::Genode::print(out, "offset=", packet.offset(), ", size=", packet.size());
} }
} }
using namespace Genode; struct Test::Base
static bool single_packet_roundtrip(Nic::Session *nic,
unsigned char content_pattern,
size_t packet_size)
{ {
public:
typedef String<64> Name;
virtual void handle_nic() = 0;
private:
Env &_env;
Name const _name;
Signal_context_capability _succeeded_sigh;
bool _done = false;
Heap _heap { _env.ram(), _env.rm() };
Allocator_avl _tx_block_alloc { &_heap };
enum { BUF_SIZE = Nic::Packet_allocator::DEFAULT_PACKET_SIZE * 128 };
Nic::Connection _nic { &_tx_block_alloc, BUF_SIZE, BUF_SIZE };
void _handle_nic() { if (!_done) handle_nic(); }
Signal_handler<Base> _nic_handler { _env.ep(), *this, &Base::_handle_nic };
public:
Nic::Connection &nic() { return _nic; }
void success()
{
/*
* There may still be packet-stream signals in flight, which we can
* ignore once the test succeeded.
*/
_done = true;
log("-- ", _name, " test succeeded --");
Signal_transmitter(_succeeded_sigh).submit();
}
template <typename... ARGS>
static void abort(ARGS &&... args)
{
error(args...);
class Error : Exception { };
throw Error();
}
Base(Env &env, Name const &name, Signal_context_capability succeeded_sigh)
:
_env(env), _name(name), _succeeded_sigh(succeeded_sigh)
{
log("-- starting ", _name, " test --");
_nic.tx_channel()->sigh_ready_to_submit(_nic_handler);
_nic.tx_channel()->sigh_ack_avail (_nic_handler);
_nic.rx_channel()->sigh_ready_to_ack (_nic_handler);
_nic.rx_channel()->sigh_packet_avail (_nic_handler);
}
};
struct Test::Roundtrip : Base
{
/*
* Each character of the string is used as pattern for one iteration.
*/
typedef String<16> Patterns;
Patterns const _patterns;
unsigned _cnt = 0;
off_t _expected_packet_offset = ~0L;
char _pattern() const { return _patterns.string()[_cnt]; }
bool _received_acknowledgement = false;
bool _received_reflected_packet = false;
enum { PACKET_SIZE = 100 };
void _produce_packet(Nic::Connection &nic)
{
log("start iteration ", _cnt, " with pattern '", Char(_pattern()), "'");
Packet_descriptor tx_packet; Packet_descriptor tx_packet;
log("single_packet_roundtrip(content='", Char(content_pattern), "', " /* allocate tx packet */
"packet_size=", packet_size, ")");
/* allocate transmit packet */
try { try {
tx_packet = nic->tx()->alloc_packet(packet_size); tx_packet = nic.tx()->alloc_packet(PACKET_SIZE); }
} catch (Nic::Session::Tx::Source::Packet_alloc_failed) { catch (Nic::Session::Tx::Source::Packet_alloc_failed) {
error(__func__, ": tx packet alloc failed"); abort(__func__, ": tx packet alloc failed"); }
return false;
} /*
* Remember the packet offset of the first packet. The offsets
* of all subsequent packets are expected to be the same.
*/
if (_expected_packet_offset == ~0L)
_expected_packet_offset = tx_packet.offset();
log("allocated tx packet ", tx_packet); log("allocated tx packet ", tx_packet);
/* fill packet with pattern */ /* fill packet with pattern */
char *tx_content = nic->tx()->packet_content(tx_packet); char *tx_content = nic.tx()->packet_content(tx_packet);
for (unsigned i = 0; i < packet_size; i++) for (unsigned i = 0; i < PACKET_SIZE; i++)
tx_content[i] = content_pattern; tx_content[i] = _pattern();
nic->tx()->submit_packet(tx_packet); if (!nic.tx()->ready_to_submit())
abort(__func__, ": submit queue is unexpectedly full");
nic.tx()->submit_packet(tx_packet);
}
void _consume_and_compare_packet(Nic::Connection &nic)
{
/*
* The acknowledgement for the sent packet and the reflected packet
* may arrive in any order.
*/
if (nic.tx()->ack_avail()) {
/* wait for acknowledgement */ /* wait for acknowledgement */
Packet_descriptor ack_tx_packet = nic->tx()->get_acked_packet(); Packet_descriptor const ack_tx_packet = nic.tx()->get_acked_packet();
if (ack_tx_packet.size() != tx_packet.size() if (ack_tx_packet.size() != PACKET_SIZE)
|| ack_tx_packet.offset() != tx_packet.offset()) { abort(__func__, ": unexpected acked packet");
error("unexpected acked packet");
return false; if (ack_tx_packet.offset() != _expected_packet_offset)
abort(__func__, ": unexpected offset of acknowledged packet");
/* release sent packet to free the space in the tx communication buffer */
nic.tx()->release_packet(ack_tx_packet);
_received_acknowledgement = true;
} }
if (nic.rx()->packet_avail()) {
/* /*
* Because we sent the packet to a loop-back device, we expect * Because we sent the packet to a loop-back device, we expect
* the same packet to be available at the rx channel of the NIC * the same packet to be available at the rx channel of the NIC
* session. * session.
*/ */
Packet_descriptor rx_packet = nic->rx()->get_packet(); Packet_descriptor const rx_packet = nic.rx()->get_packet();
log("received rx packet ", rx_packet); log("received rx packet ", rx_packet);
if (rx_packet.size() != tx_packet.size()) { if (rx_packet.size() != PACKET_SIZE)
error("sent and echoed packets differ in size"); abort("sent and echoed packets differ in size");
return false;
} if (rx_packet.offset() != _expected_packet_offset)
abort(__func__, ": unexpected offset of received packet");
/* compare original and echoed packets */ /* compare original and echoed packets */
char *rx_content = nic->rx()->packet_content(rx_packet); char const * const rx_content = nic.rx()->packet_content(rx_packet);
for (unsigned i = 0; i < packet_size; i++) for (unsigned i = 0; i < PACKET_SIZE; i++)
if (rx_content[i] != tx_content[i]) { if (rx_content[i] != _pattern()) {
error("sent and echoed packets have differnt content"); log("rx_content[", i, "]: ", Char(rx_content[i]));
return false; log("pattern: ", Char(_pattern()));
abort(__func__, ":sent and echoed packets have different content");
} }
/* acknowledge received packet */ if (!nic.rx()->ack_slots_free())
nic->rx()->acknowledge_packet(rx_packet); abort(__func__, ": acknowledgement queue is unexpectedly full");
/* release sent packet to free the space in the tx communication buffer */ nic.rx()->acknowledge_packet(rx_packet);
nic->tx()->release_packet(tx_packet);
return true; _received_reflected_packet = true;
} }
}
void handle_nic() override
{
_consume_and_compare_packet(nic());
if (!_received_acknowledgement || !_received_reflected_packet)
return;
/* start next iteration */
_cnt++;
/* check if we reached the end of the pattern string */
if (_pattern() == 0) {
success();
return;
}
_received_reflected_packet = false;
_received_acknowledgement = false;
_produce_packet(nic());
}
Roundtrip(Env &env, Signal_context_capability success_sigh, Patterns patterns)
:
Base(env, "roundtrip", success_sigh), _patterns(patterns)
{
_produce_packet(nic());
}
};
static bool batch_packets(Nic::Session *nic, unsigned num_packets) struct Test::Batch : Base
{ {
unsigned tx_cnt = 0, acked_cnt = 0, rx_cnt = 0, batch_cnt = 0; unsigned const _num_packets;
Genode::Signal_context tx_ready_to_submit, tx_ack_avail, unsigned _tx_cnt = 0, _acked_cnt = 0, _rx_cnt = 0, _batch_cnt = 0;
rx_ready_to_ack, rx_packet_avail;
Genode::Signal_receiver signal_receiver;
nic->tx_channel()->sigh_ready_to_submit (signal_receiver.manage(&tx_ready_to_submit));
nic->tx_channel()->sigh_ack_avail (signal_receiver.manage(&tx_ack_avail));
nic->rx_channel()->sigh_ready_to_ack (signal_receiver.manage(&rx_ready_to_ack));
nic->rx_channel()->sigh_packet_avail (signal_receiver.manage(&rx_packet_avail));
enum { PACKET_SIZE = 100 }; enum { PACKET_SIZE = 100 };
while (acked_cnt != num_packets static unsigned _send_packets(Nic::Connection &nic, unsigned limit)
|| tx_cnt != num_packets {
|| rx_cnt != num_packets) { unsigned cnt = 0;
while (nic.tx()->ready_to_submit() && cnt < limit) {
if (tx_cnt > rx_cnt || tx_cnt > acked_cnt)
signal_receiver.wait_for_signal();
/* produce as many packets as possible as one batch */
unsigned max_outstanding_requests = Nic::Session::QUEUE_SIZE - 1;
while (nic->tx()->ready_to_submit()
&& tx_cnt < num_packets
&& tx_cnt - rx_cnt < max_outstanding_requests) {
try { try {
Packet_descriptor tx_packet = nic->tx()->alloc_packet(PACKET_SIZE); Packet_descriptor tx_packet = nic.tx()->alloc_packet(PACKET_SIZE);
nic->tx()->submit_packet(tx_packet); nic.tx()->submit_packet(tx_packet);
tx_cnt++; cnt++;
} catch (Nic::Session::Tx::Source::Packet_alloc_failed) {
break;
} }
catch (Nic::Session::Tx::Source::Packet_alloc_failed) { break; }
}
return cnt;
} }
unsigned batch_rx_cnt = 0, batch_acked_cnt = 0; /*
* \return number of received acknowledgements
/* check for acknowledgements */ */
while (nic->tx()->ack_avail()) { static unsigned _collect_acknowledgements(Nic::Connection &nic)
Packet_descriptor acked_packet = nic->tx()->get_acked_packet(); {
nic->tx()->release_packet(acked_packet); unsigned cnt = 0;
acked_cnt++; while (nic.tx()->ack_avail()) {
batch_acked_cnt++; Packet_descriptor acked_packet = nic.tx()->get_acked_packet();
nic.tx()->release_packet(acked_packet);
cnt++;
}
return cnt;
} }
/* check for available rx packets */ static unsigned _receive_all_incoming_packets(Nic::Connection &nic)
while (nic->rx()->packet_avail() && nic->rx()->ready_to_ack()) { {
Packet_descriptor rx_packet = nic->rx()->get_packet(); unsigned cnt = 0;
while (nic.rx()->packet_avail() && nic.rx()->ready_to_ack()) {
if (!nic->rx()->ready_to_ack()) Packet_descriptor rx_packet = nic.rx()->get_packet();
warning("not ready for ack, going to blocK"); nic.rx()->acknowledge_packet(rx_packet);
cnt++;
nic->rx()->acknowledge_packet(rx_packet); }
rx_cnt++; return cnt;
batch_rx_cnt++;
} }
log("acked ", batch_acked_cnt, " packets, " void _check_for_success()
"received ", batch_rx_cnt, " packets " {
"-> tx: ", tx_cnt, ", acked: ", acked_cnt, ", rx: ", rx_cnt); unsigned const n = _num_packets;
if (_acked_cnt == n && _tx_cnt == n && _rx_cnt == n)
batch_cnt++; success();
} }
log("test used ", batch_cnt, " batches"); void handle_nic() override
return true; {
} unsigned const max_outstanding_requests = Nic::Session::QUEUE_SIZE - 1;
unsigned const outstanding_requests = _tx_cnt - _rx_cnt;
unsigned const tx_limit = min(_num_packets - _tx_cnt,
max_outstanding_requests - outstanding_requests);
unsigned const num_tx = _send_packets(nic(), tx_limit);
unsigned const num_acks = _collect_acknowledgements(nic());
unsigned const num_rx = _receive_all_incoming_packets(nic());
_tx_cnt += num_tx;
_rx_cnt += num_rx;
_acked_cnt += num_acks;
log("acked ", num_acks, " packets, "
"received ", num_rx, " packets "
"-> tx: ", _tx_cnt, ", acked: ", _acked_cnt, ", rx: ", _rx_cnt);
_check_for_success();
}
Batch(Env &env, Signal_context_capability success_sigh, unsigned num_packets)
:
Base(env, "batch", success_sigh), _num_packets(num_packets)
{
handle_nic();
}
};
int main(int, char **) struct Test::Main
{ {
Env &_env;
Constructible<Roundtrip> _roundtrip;
Constructible<Batch> _batch;
Signal_handler<Main> _test_completed_handler {
_env.ep(), *this, &Main::_handle_test_completed };
void _handle_test_completed()
{
if (_roundtrip.constructed()) {
_roundtrip.destruct();
enum { NUM_PACKETS = 1000 };
_batch.construct(_env, _test_completed_handler, NUM_PACKETS);
return;
}
if (_batch.constructed()) {
_batch.destruct();
log("--- finished NIC loop-back test ---");
_env.parent().exit(0);
}
}
Main(Env &env) : _env(env)
{
log("--- NIC loop-back test ---"); log("--- NIC loop-back test ---");
enum { BUF_SIZE = Nic::Packet_allocator::DEFAULT_PACKET_SIZE * 128 }; _roundtrip.construct(_env, _test_completed_handler, "abcdefghijklmn");
bool config_test_roundtrip = true;
bool config_test_batch = true;
if (config_test_roundtrip) {
log("-- test roundtrip two times (packet offsets should be the same) --");
Allocator_avl tx_block_alloc(env()->heap());
Nic::Connection nic(&tx_block_alloc, BUF_SIZE, BUF_SIZE);
single_packet_roundtrip(&nic, 'a', 100);
single_packet_roundtrip(&nic, 'b', 100);
} }
};
if (config_test_batch) {
log("-- test submitting and receiving batches of packets --");
Allocator_avl tx_block_alloc(env()->heap());
Nic::Connection nic(&tx_block_alloc, BUF_SIZE, BUF_SIZE);
enum { NUM_PACKETS = 1000 };
batch_packets(&nic, NUM_PACKETS);
}
log("--- finished NIC loop-back test ---"); void Component::construct(Genode::Env &env) { static Test::Main main(env); }
return 0;
}