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Kernel/Net: Introduce a new mechanism to initialize a PCI device

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Instead of using a clunky if-statement paradigm, we now have all drivers
being declaring two methods for their adapter class - create and probe.
These methods are linked in each PCINetworkDriverInitializer structure,
in a new s_initializers static list of them.
Then, when we probe for a PCI device, we use each probe method and if
there's a match, then the corresponding create method is called. After
the adapter instance is created, we call the virtual initialize method
on it, because many drivers actually require a sort of post-construction
initialization sequence to ensure the network adapter can properly
function.

As a result of this change, it's much more easy to add more drivers and
the initialization code is more readable and it's easier to understand
when and where things could fail in the whole initialization sequence.
This commit is contained in:
Liav A 2022-12-17 22:11:44 +02:00 • committed by Jelle Raaijmakers
parent 90ac9d7253
commit 0cede94c39
13 changed files with 131 additions and 86 deletions
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26
Kernel/Net/Realtek/RTL8168NetworkAdapter.cpp
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@ -182,12 +182,17 @@ namespace Kernel {
#define TX_BUFFER_SIZE 0x1FF8
#define RX_BUFFER_SIZE 0x1FF8 // FIXME: this should be increased (0x3FFF)
UNMAP_AFTER_INIT ErrorOr<LockRefPtr<RTL8168NetworkAdapter>> RTL8168NetworkAdapter::try_to_initialize(PCI::DeviceIdentifier const& pci_device_identifier)
UNMAP_AFTER_INIT ErrorOr<bool> RTL8168NetworkAdapter::probe(PCI::DeviceIdentifier const& pci_device_identifier)
{
if (pci_device_identifier.hardware_id().vendor_id != PCI::VendorID::Realtek)
return nullptr;
return false;
if (pci_device_identifier.hardware_id().device_id != 0x8168)
return nullptr;
return false;
return true;
}
UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<NetworkAdapter>> RTL8168NetworkAdapter::create(PCI::DeviceIdentifier const& pci_device_identifier)
{
u8 irq = pci_device_identifier.interrupt_line().value();
auto interface_name = TRY(NetworkingManagement::generate_interface_name_from_pci_address(pci_device_identifier));
auto registers_io_window = TRY(IOWindow::create_for_pci_device_bar(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR0));
@ -249,21 +254,17 @@ UNMAP_AFTER_INIT RTL8168NetworkAdapter::RTL8168NetworkAdapter(PCI::Address addre
{
dmesgln_pci(*this, "Found @ {}", pci_address());
dmesgln_pci(*this, "I/O port base: {}", m_registers_io_window);
}
UNMAP_AFTER_INIT ErrorOr<void> RTL8168NetworkAdapter::initialize(Badge<NetworkingManagement>)
{
identify_chip_version();
dmesgln_pci(*this, "Version detected - {} ({}{})", possible_device_name(), (u8)m_version, m_version_uncertain ? "?" : "");
if (!determine_supported_version()) {
dmesgln_pci(*this, "Aborting initialization! Support for your chip version ({}) is not implemented yet, please open a GH issue and include this message.", (u8)m_version);
return; // Each ChipVersion requires a specific implementation of configure_phy and hardware_quirks
return Error::from_errno(ENODEV); // Each ChipVersion requires a specific implementation of configure_phy and hardware_quirks
}
initialize();
startup();
}
void RTL8168NetworkAdapter::initialize()
{
// set initial REG_RXCFG
auto rx_config = RXCFG_MAX_DMA_UNLIMITED;
if (m_version <= ChipVersion::Version3) {
@ -344,6 +345,9 @@ void RTL8168NetworkAdapter::initialize()
// notify
TODO();
}
startup();
return {};
}
void RTL8168NetworkAdapter::startup()