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b6ba0f9fad
Calls to link_up() in the E1000 driver would read the link state directly from the hardware on every call. This had negative performance impact in high throughput situations since link_up() is called every time an IP packet's route is resolved. This patch takes inspiration from the RTL8139 network adapter where the link state is stored in a bool and only updated when the hardware generates an interrupt related to link state change. After this change I measured a ~9% increase in TCP Tx throughput using: cat /dev/zero | nc <host_IP> <host_port> from the Serenity VM to my host machine
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 = 32;
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static constexpr size_t number_of_tx_descriptors = 8;
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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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