mirror of
https://github.com/RGBCube/serenity
synced 2025-05-18 00:45:06 +00:00
06cf01cd1e
We were frequently dropping packets when downloading large files. Then we had to wait for TCP retransmission which slowed things down. This patch dramatically improves E1000 throughput by increasing the number of RX/TX buffers from 32/8 to 256/256. The largest chunk of JavaScript from Discord now downloads in roughly 1 second instead of 7 seconds. :^)
101 lines
2.9 KiB
C++
101 lines
2.9 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/Arch/x86/IO.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/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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class E1000NetworkAdapter : 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 RefPtr<E1000NetworkAdapter> try_to_initialize(PCI::DeviceIdentifier const&);
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virtual bool initialize();
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virtual ~E1000NetworkAdapter() 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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protected:
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void setup_interrupts();
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void setup_link();
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E1000NetworkAdapter(PCI::Address, u8 irq, NonnullOwnPtr<KString>);
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virtual bool handle_irq(const RegisterState&) override;
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virtual StringView class_name() const override { return "E1000NetworkAdapter"sv; }
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struct [[gnu::packed]] e1000_rx_desc {
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volatile uint64_t addr { 0 };
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volatile uint16_t length { 0 };
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volatile uint16_t checksum { 0 };
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volatile uint8_t status { 0 };
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volatile uint8_t errors { 0 };
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volatile uint16_t special { 0 };
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};
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struct [[gnu::packed]] e1000_tx_desc {
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volatile uint64_t addr { 0 };
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volatile uint16_t length { 0 };
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volatile uint8_t cso { 0 };
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volatile uint8_t cmd { 0 };
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volatile uint8_t status { 0 };
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volatile uint8_t css { 0 };
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volatile uint16_t special { 0 };
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};
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virtual void detect_eeprom();
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virtual u32 read_eeprom(u8 address);
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void read_mac_address();
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void write_command(u16 address, u32);
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u32 read_command(u16 address);
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void initialize_rx_descriptors();
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void initialize_tx_descriptors();
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void out8(u16 address, u8);
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void out16(u16 address, u16);
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void out32(u16 address, u32);
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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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void receive();
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static constexpr size_t number_of_rx_descriptors = 256;
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static constexpr size_t number_of_tx_descriptors = 256;
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IOAddress m_io_base;
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VirtualAddress m_mmio_base;
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OwnPtr<Memory::Region> m_rx_descriptors_region;
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OwnPtr<Memory::Region> m_tx_descriptors_region;
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OwnPtr<Memory::Region> m_rx_buffer_region;
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OwnPtr<Memory::Region> m_tx_buffer_region;
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Array<void*, number_of_rx_descriptors> m_rx_buffers;
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Array<void*, number_of_tx_descriptors> m_tx_buffers;
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OwnPtr<Memory::Region> m_mmio_region;
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bool m_has_eeprom { false };
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bool m_use_mmio { false };
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bool m_link_up { false };
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EntropySource m_entropy_source;
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WaitQueue m_wait_queue;
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};
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}
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