mirror of
https://github.com/RGBCube/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. :^)
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/OwnPtr.h>
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#include <Kernel/Bus/PCI/Access.h>
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#include <Kernel/Bus/PCI/Device.h>
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#include <Kernel/IOWindow.h>
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#include <Kernel/Interrupts/IRQHandler.h>
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#include <Kernel/Net/NetworkAdapter.h>
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#include <Kernel/Random.h>
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namespace Kernel {
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#define RTL8139_TX_BUFFER_COUNT 4
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class RTL8139NetworkAdapter final : public NetworkAdapter
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, public PCI::Device
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, public IRQHandler {
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public:
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static ErrorOr<LockRefPtr<RTL8139NetworkAdapter>> try_to_initialize(PCI::DeviceIdentifier const&);
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virtual ~RTL8139NetworkAdapter() override;
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virtual void send_raw(ReadonlyBytes) override;
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virtual bool link_up() override { return m_link_up; }
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virtual i32 link_speed() override;
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virtual bool link_full_duplex() override;
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virtual StringView purpose() const override { return class_name(); }
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private:
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RTL8139NetworkAdapter(PCI::Address, u8 irq, NonnullOwnPtr<IOWindow> registers_io_window, NonnullOwnPtr<KString>);
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virtual bool handle_irq(RegisterState const&) override;
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virtual StringView class_name() const override { return "RTL8139NetworkAdapter"sv; }
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void reset();
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void read_mac_address();
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void receive();
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void out8(u16 address, u8 data);
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void out16(u16 address, u16 data);
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void out32(u16 address, u32 data);
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u8 in8(u16 address);
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u16 in16(u16 address);
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u32 in32(u16 address);
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NonnullOwnPtr<IOWindow> m_registers_io_window;
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u8 m_interrupt_line { 0 };
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OwnPtr<Memory::Region> m_rx_buffer;
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u16 m_rx_buffer_offset { 0 };
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Vector<OwnPtr<Memory::Region>> m_tx_buffers;
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u8 m_tx_next_buffer { 0 };
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OwnPtr<Memory::Region> m_packet_buffer;
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bool m_link_up { false };
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EntropySource m_entropy_source;
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};
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}
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