mirror of
https://github.com/SerenityOS/serenity
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30d3f2789e
When scanning for network adapters, we give each driver a chance to claim the PCI device and whoever claims it first gets to keep it. Before this patch, the driver API returned a LockRefPtr<AdapterType>, which made it impossible to propagate errors that occurred during detection and/or initialization. This patch changes the API so that errors can bubble all the way out the PCI enumeration in NetworkingManagement::initialize() where we perform all the network adapter auto-detection on boot. When we eventually start to support hot-plugging network adapter in the future, it will be even more important to propagate errors instead of swallowing them. Importantly, before this patch, some errors were "handled" by panicking the kernel. This is no longer the case. 7 FIXMEs were killed in the making of this commit. :^)
133 lines
4.7 KiB
C++
133 lines
4.7 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Singleton.h>
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/CommandLine.h>
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#include <Kernel/KString.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Multiboot.h>
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#include <Kernel/Net/Intel/E1000ENetworkAdapter.h>
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#include <Kernel/Net/Intel/E1000NetworkAdapter.h>
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#include <Kernel/Net/LoopbackAdapter.h>
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#include <Kernel/Net/NE2000/NetworkAdapter.h>
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#include <Kernel/Net/NetworkingManagement.h>
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#include <Kernel/Net/Realtek/RTL8139NetworkAdapter.h>
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#include <Kernel/Net/Realtek/RTL8168NetworkAdapter.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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static Singleton<NetworkingManagement> s_the;
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NetworkingManagement& NetworkingManagement::the()
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{
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return *s_the;
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}
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bool NetworkingManagement::is_initialized()
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{
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return s_the.is_initialized();
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}
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UNMAP_AFTER_INIT NetworkingManagement::NetworkingManagement()
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{
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}
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NonnullLockRefPtr<NetworkAdapter> NetworkingManagement::loopback_adapter() const
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{
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return *m_loopback_adapter;
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}
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void NetworkingManagement::for_each(Function<void(NetworkAdapter&)> callback)
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{
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m_adapters.for_each([&](auto& adapter) {
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callback(adapter);
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});
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}
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ErrorOr<void> NetworkingManagement::try_for_each(Function<ErrorOr<void>(NetworkAdapter&)> callback)
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{
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return m_adapters.with([&](auto& adapters) -> ErrorOr<void> {
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for (auto& adapter : adapters)
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TRY(callback(adapter));
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return {};
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});
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}
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LockRefPtr<NetworkAdapter> NetworkingManagement::from_ipv4_address(IPv4Address const& address) const
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{
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if (address[0] == 0 && address[1] == 0 && address[2] == 0 && address[3] == 0)
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return m_loopback_adapter;
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if (address[0] == 127)
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return m_loopback_adapter;
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return m_adapters.with([&](auto& adapters) -> LockRefPtr<NetworkAdapter> {
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for (auto& adapter : adapters) {
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if (adapter.ipv4_address() == address || adapter.ipv4_broadcast() == address)
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return adapter;
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}
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return nullptr;
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});
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}
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LockRefPtr<NetworkAdapter> NetworkingManagement::lookup_by_name(StringView name) const
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{
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return m_adapters.with([&](auto& adapters) -> LockRefPtr<NetworkAdapter> {
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for (auto& adapter : adapters) {
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if (adapter.name() == name)
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return adapter;
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}
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return nullptr;
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});
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}
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ErrorOr<NonnullOwnPtr<KString>> NetworkingManagement::generate_interface_name_from_pci_address(PCI::DeviceIdentifier const& device_identifier)
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{
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VERIFY(device_identifier.class_code().value() == 0x2);
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// Note: This stands for e - "Ethernet", p - "Port" as for PCI bus, "s" for slot as for PCI slot
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auto name = TRY(KString::formatted("ep{}s{}", device_identifier.address().bus(), device_identifier.address().device()));
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VERIFY(!NetworkingManagement::the().lookup_by_name(name->view()));
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return name;
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}
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UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<NetworkAdapter>> NetworkingManagement::determine_network_device(PCI::DeviceIdentifier const& device_identifier) const
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{
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if (auto candidate = TRY(E1000NetworkAdapter::try_to_initialize(device_identifier)))
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return candidate.release_nonnull();
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if (auto candidate = TRY(E1000ENetworkAdapter::try_to_initialize(device_identifier)))
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return candidate.release_nonnull();
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if (auto candidate = TRY(RTL8139NetworkAdapter::try_to_initialize(device_identifier)))
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return candidate.release_nonnull();
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if (auto candidate = TRY(RTL8168NetworkAdapter::try_to_initialize(device_identifier)))
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return candidate.release_nonnull();
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if (auto candidate = TRY(NE2000NetworkAdapter::try_to_initialize(device_identifier)))
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return candidate.release_nonnull();
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return Error::from_string_literal("Unsupported network adapter");
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}
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bool NetworkingManagement::initialize()
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{
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if (!kernel_command_line().is_physical_networking_disabled() && !PCI::Access::is_disabled()) {
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MUST(PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
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// Note: PCI class 2 is the class of Network devices
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if (device_identifier.class_code().value() != 0x02)
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return;
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auto result = determine_network_device(device_identifier);
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if (result.is_error()) {
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dmesgln("Failed to initialize network adapter ({} {}): {}", device_identifier.address(), device_identifier.hardware_id(), result.error());
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return;
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}
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m_adapters.with([&](auto& adapters) { adapters.append(result.release_value()); });
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}));
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}
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auto loopback = LoopbackAdapter::try_create();
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VERIFY(loopback);
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m_adapters.with([&](auto& adapters) { adapters.append(*loopback); });
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m_loopback_adapter = loopback;
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return true;
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}
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}
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