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Kernel: Add an initial implementation of virtio-net driver

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It can be exercised by setting
    SERENITY_ETHERNET_DEVICE_TYPE=virtio-net-pci.
This commit is contained in:
Kirill Nikolaev 2023-07-02 17:39:47 +02:00 committed by Andrew Kaster
parent b00a23b0b6
commit 6cdb1f0415
Notes: sideshowbarker 2024-07-16 22:34:39 +09:00 
Author: https://github.com/nichtverstehen 🔰
Commit: https://github.com/SerenityOS/serenity/commit/6cdb1f0415
Pull-request: https://github.com/SerenityOS/serenity/pull/19757
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/gmta
5 changed files with 347 additions and 0 deletions
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1
Kernel/CMakeLists.txt
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@ -250,6 +250,7 @@ set(KERNEL_SOURCES
Net/Intel/E1000ENetworkAdapter.cpp
Net/Intel/E1000NetworkAdapter.cpp
Net/Realtek/RTL8168NetworkAdapter.cpp
Net/VirtIO/VirtIONetworkAdapter.cpp
Net/IPv4Socket.cpp
Net/LocalSocket.cpp
Net/LoopbackAdapter.cpp

1
Kernel/Memory/RingBuffer.h
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@ -24,6 +24,7 @@ public:
Spinlock<LockRank::None>& lock() { return m_lock; }
size_t used_bytes() const { return m_num_used_bytes; }
size_t available_bytes() const { return m_capacity_in_bytes - m_num_used_bytes; }
PhysicalAddress start_of_region() const { return m_region->physical_page(0)->paddr(); }
VirtualAddress vaddr() const { return m_region->vaddr(); }
size_t bytes_till_end() const { return (m_capacity_in_bytes - ((m_start_of_used + m_num_used_bytes) % m_capacity_in_bytes)) % m_capacity_in_bytes; }

2
Kernel/Net/NetworkingManagement.cpp
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@ -15,6 +15,7 @@
#include <Kernel/Net/LoopbackAdapter.h>
#include <Kernel/Net/NetworkingManagement.h>
#include <Kernel/Net/Realtek/RTL8168NetworkAdapter.h>
#include <Kernel/Net/VirtIO/VirtIONetworkAdapter.h>
#include <Kernel/Sections.h>
namespace Kernel {
@ -100,6 +101,7 @@ static constexpr PCINetworkDriverInitializer s_initializers[] = {
{ RTL8168NetworkAdapter::probe, RTL8168NetworkAdapter::create },
{ E1000NetworkAdapter::probe, E1000NetworkAdapter::create },
{ E1000ENetworkAdapter::probe, E1000ENetworkAdapter::create },
{ VirtIONetworkAdapter::probe, VirtIONetworkAdapter::create },
};
UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<NetworkAdapter>> NetworkingManagement::determine_network_device(PCI::DeviceIdentifier const& device_identifier) const

283
Kernel/Net/VirtIO/VirtIONetworkAdapter.cpp Normal file
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@ -0,0 +1,283 @@
/*
* Copyright (c) 2023, Kirill Nikolaev <cyril7@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Bus/PCI/IDs.h>
#include <Kernel/Net/NetworkingManagement.h>
#include <Kernel/Net/VirtIO/VirtIONetworkAdapter.h>
namespace Kernel {
namespace VirtIO {
// https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html
static constexpr u64 VIRTIO_NET_F_CSUM = (1ull << 0); // Device handles packets with partial checksum.
static constexpr u64 VIRTIO_NET_F_GUEST_CSUM = (1ull << 1); // Driver handles packets with partial checksum.
static constexpr u64 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS = (1ull << 2); // Control channel offloads reconfiguration support.
static constexpr u64 VIRTIO_NET_F_MTU = (1ull << 3); // Device maximum MTU reporting is supported.
static constexpr u64 VIRTIO_NET_F_MAC = (1ull << 5); // Device has given MAC address.
static constexpr u64 VIRTIO_NET_F_GUEST_TSO4 = (1ull << 7); // Driver can receive TSOv4.
static constexpr u64 VIRTIO_NET_F_GUEST_TSO6 = (1ull << 8); // Driver can receive TSOv6.
static constexpr u64 VIRTIO_NET_F_GUEST_ECN = (1ull << 9); // Driver can receive TSO with ECN.
static constexpr u64 VIRTIO_NET_F_GUEST_UFO = (1ull << 10); // Driver can receive UFO.
static constexpr u64 VIRTIO_NET_F_HOST_TSO4 = (1ull << 11); // Device can receive TSOv4.
static constexpr u64 VIRTIO_NET_F_HOST_TSO6 = (1ull << 12); // Device can receive TSOv6.
static constexpr u64 VIRTIO_NET_F_HOST_ECN = (1ull << 13); // Device can receive TSO with ECN.
static constexpr u64 VIRTIO_NET_F_HOST_UFO = (1ull << 14); // Device can receive UFO.
static constexpr u64 VIRTIO_NET_F_MRG_RXBUF = (1ull << 15); // Driver can merge receive buffers.
static constexpr u64 VIRTIO_NET_F_STATUS = (1ull << 16); // Configuration status field is available.
static constexpr u64 VIRTIO_NET_F_CTRL_VQ = (1ull << 17); // Control channel is available.
static constexpr u64 VIRTIO_NET_F_CTRL_RX = (1ull << 18); // Control channel RX mode support.
static constexpr u64 VIRTIO_NET_F_CTRL_VLAN = (1ull << 19); // Control channel VLAN filtering.
static constexpr u64 VIRTIO_NET_F_GUEST_ANNOUNCE = (1ull << 21); // Driver can send gratuitous packets.
static constexpr u64 VIRTIO_NET_F_MQ = (1ull << 22); // Device supports multiqueue with automatic receive steering.
static constexpr u64 VIRTIO_NET_F_CTRL_MAC_ADDR = (1ull << 23); // Set MAC address through control channel.
static constexpr u64 VIRTIO_NET_F_HOST_USO = (1ull << 56); // Device can receive USO packets.
static constexpr u64 VIRTIO_NET_F_HASH_REPORT = (1ull << 57); // Device can report per-packet hash value and a type of calculated hash.
static constexpr u64 VIRTIO_NET_F_GUEST_HDRLEN = (1ull << 59); // Driver can provide the exact hdr_len value.
static constexpr u64 VIRTIO_NET_F_RSS = (1ull << 60); // Device supports RSS with Toeplitz hash calculation
static constexpr u64 VIRTIO_NET_F_RSC_EXT = (1ull << 21); // Device can process duplicated ACKs and report number of coalesced segments and duplicated ACKs.
static constexpr u64 VIRTIO_NET_F_STANDBY = (1ull << 63); // Device may act as a standby for a primary device with the same MAC address.
static constexpr u64 VIRTIO_NET_F_SPEED_DUPLEX = (1ull << 63); // Device reports speed and duplex.
static constexpr u16 VIRTIO_NET_S_LINK_UP = 1;
static constexpr u16 VIRTIO_NET_S_ANNOUNCE = 2;
static constexpr u8 VIRTIO_NET_HDR_F_NEEDS_CSUM = 1;
static constexpr u8 VIRTIO_NET_HDR_F_DATA_VALID = 1;
static constexpr u8 VIRTIO_NET_HDR_F_RSC_INFO = 1;
static constexpr u8 VIRTIO_NET_HDR_GSO_NONE = 0;
static constexpr u8 VIRTIO_NET_HDR_GSO_TCPV4 = 1;
static constexpr u8 VIRTIO_NET_HDR_GSO_UDP = 3;
static constexpr u8 VIRTIO_NET_HDR_GSO_TCPV6 = 4;
static constexpr u8 VIRTIO_NET_HDR_GSO_UDP_L4 = 5;
static constexpr u8 VIRTIO_NET_HDR_GSO_ECN = 0x80;
struct [[gnu::packed]] VirtIONetConfig {
u8 mac[6];
LittleEndian<u16> status;
LittleEndian<u16> max_virtqueue_pairs;
LittleEndian<u16> mtu;
LittleEndian<u32> speed;
u8 duplex;
u8 rss_max_key_size;
LittleEndian<u16> rss_max_indirection_table_length;
LittleEndian<u32> supported_hash_types;
};
struct [[gnu::packed]] VirtIONetHdr {
u8 flags;
u8 gso_type;
LittleEndian<u16> hdr_len;
LittleEndian<u16> gso_size;
LittleEndian<u16> csum_start;
LittleEndian<u16> csum_offset;
LittleEndian<u16> num_buffers;
u8 frame[0];
};
}
using namespace VirtIO;
static constexpr u16 RECEIVEQ = 0;
static constexpr u16 TRANSMITQ = 1;
static constexpr size_t MAX_RX_FRAME_SIZE = 1514; // Non-jumbo Ethernet frame limit.
static constexpr size_t RX_BUFFER_SIZE = sizeof(VirtIONetHdr) * MAX_RX_FRAME_SIZE;
static constexpr u16 MAX_INFLIGHT_PACKETS = 128;
UNMAP_AFTER_INIT ErrorOr<bool> VirtIONetworkAdapter::probe(PCI::DeviceIdentifier const& pci_device_identifier)
{
if (pci_device_identifier.hardware_id().vendor_id != PCI::VendorID::VirtIO)
return false;
if (pci_device_identifier.hardware_id().device_id != PCI::DeviceID::VirtIONetAdapter)
return false;
return true;
}
UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<NetworkAdapter>> VirtIONetworkAdapter::create(PCI::DeviceIdentifier const& pci_device_identifier)
{
auto interface_name = TRY(NetworkingManagement::generate_interface_name_from_pci_address(pci_device_identifier));
return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) VirtIONetworkAdapter(pci_device_identifier, move(interface_name))));
}
UNMAP_AFTER_INIT VirtIONetworkAdapter::VirtIONetworkAdapter(PCI::DeviceIdentifier const& pci_device_identifier, NonnullOwnPtr<KString> interface_name)
: VirtIO::Device(pci_device_identifier)
, NetworkAdapter(move(interface_name))
{
}
UNMAP_AFTER_INIT ErrorOr<void> VirtIONetworkAdapter::initialize(Badge<NetworkingManagement>)
{
m_rx_buffers = TRY(Memory::RingBuffer::try_create("VirtIONetworkAdapter Rx buffer"sv, RX_BUFFER_SIZE * MAX_INFLIGHT_PACKETS));
m_tx_buffers = TRY(Memory::RingBuffer::try_create("VirtIONetworkAdapter Tx buffer"sv, RX_BUFFER_SIZE * MAX_INFLIGHT_PACKETS));
return initialize_virtio_resources();
}
UNMAP_AFTER_INIT ErrorOr<void> VirtIONetworkAdapter::initialize_virtio_resources()
{
dbgln_if(VIRTIO_DEBUG, "VirtIONetworkAdapter: initialize_virtio_resources");
TRY(Device::initialize_virtio_resources());
m_device_config = TRY(get_config(VirtIO::ConfigurationType::Device));
bool success = negotiate_features([&](u64 supported_features) {
u64 negotiated = 0;
if (is_feature_set(supported_features, VIRTIO_NET_F_STATUS))
negotiated |= VIRTIO_NET_F_STATUS;
if (is_feature_set(supported_features, VIRTIO_NET_F_MAC))
negotiated |= VIRTIO_NET_F_MAC;
if (is_feature_set(supported_features, VIRTIO_NET_F_SPEED_DUPLEX))
negotiated |= VIRTIO_NET_F_SPEED_DUPLEX;
if (is_feature_set(supported_features, VIRTIO_NET_F_MTU))
negotiated |= VIRTIO_NET_F_MTU;
return negotiated;
});
if (!success)
return Error::from_errno(EIO);
success = handle_device_config_change();
if (!success)
return Error::from_errno(EIO);
success = setup_queues(2); // receive & transmit
if (!success)
return Error::from_errno(EIO);
finish_init();
{
// Supply receive buffers.
auto& rx_queue = get_queue(RECEIVEQ);
SpinlockLocker queue_lock(rx_queue.lock());
VirtIO::QueueChain chain(rx_queue);
while (m_rx_buffers->available_bytes() > RX_BUFFER_SIZE) {
// We know that the RingBuffer will not wraparound in this loop. But it's still awkward.
auto buffer_start = MUST(m_rx_buffers->reserve_space(RX_BUFFER_SIZE));
VERIFY(chain.add_buffer_to_chain(buffer_start, RX_BUFFER_SIZE, VirtIO::BufferType::DeviceWritable));
supply_chain_and_notify(RECEIVEQ, chain);
}
}
return {};
}
bool VirtIONetworkAdapter::handle_device_config_change()
{
dbgln_if(VIRTIO_DEBUG, "VirtIONetworkAdapter: handle_device_config_change");
read_config_atomic([&]() {
if (is_feature_accepted(VIRTIO_NET_F_MAC)) {
set_mac_address(MACAddress(
config_read8(*m_device_config, 0x0),
config_read8(*m_device_config, 0x1),
config_read8(*m_device_config, 0x2),
config_read8(*m_device_config, 0x3),
config_read8(*m_device_config, 0x4),
config_read8(*m_device_config, 0x5)));
}
if (is_feature_accepted(VIRTIO_NET_F_STATUS)) {
u16 status = config_read16(*m_device_config, offsetof(VirtIONetConfig, status));
m_link_up = (status & VIRTIO_NET_S_LINK_UP) != 0;
}
if (is_feature_accepted(VIRTIO_NET_F_MTU)) {
u16 mtu = config_read16(*m_device_config, offsetof(VirtIONetConfig, mtu));
set_mtu(mtu);
}
if (is_feature_accepted(VIRTIO_NET_F_SPEED_DUPLEX)) {
u32 speed = config_read32(*m_device_config, offsetof(VirtIONetConfig, speed));
m_link_speed = speed;
u32 duplex = config_read32(*m_device_config, offsetof(VirtIONetConfig, duplex));
m_link_duplex = duplex == 0x01;
}
});
return true;
}
void VirtIONetworkAdapter::handle_queue_update(u16 queue_index)
{
dbgln_if(VIRTIO_DEBUG, "VirtIONetworkAdapter: handle_queue_update {}", queue_index);
if (queue_index == RECEIVEQ) {
// FIXME: Disable interrupts while receiving as recommended by the spec.
auto& queue = get_queue(RECEIVEQ);
SpinlockLocker queue_lock(queue.lock());
size_t used;
VirtIO::QueueChain popped_chain = queue.pop_used_buffer_chain(used);
while (!popped_chain.is_empty()) {
VERIFY(popped_chain.length() == 1);
popped_chain.for_each([&](PhysicalAddress addr, size_t length) {
size_t offset = addr.as_ptr() - m_rx_buffers->start_of_region().as_ptr();
auto* message = reinterpret_cast<VirtIONetHdr*>(m_rx_buffers->vaddr().offset(offset).as_ptr());
did_receive({ message->frame, length - sizeof(VirtIONetHdr) });
});
supply_chain_and_notify(RECEIVEQ, popped_chain);
popped_chain = queue.pop_used_buffer_chain(used);
}
} else if (queue_index == TRANSMITQ) {
auto& queue = get_queue(TRANSMITQ);
SpinlockLocker queue_lock(queue.lock());
SpinlockLocker ringbuffer_lock(m_tx_buffers->lock());
size_t used;
VirtIO::QueueChain popped_chain = queue.pop_used_buffer_chain(used);
do {
popped_chain.for_each([this](PhysicalAddress address, size_t length) {
m_tx_buffers->reclaim_space(address, length);
});
popped_chain.release_buffer_slots_to_queue();
popped_chain = queue.pop_used_buffer_chain(used);
} while (!popped_chain.is_empty());
} else {
dmesgln("VirtIONetworkAdapter: unexpected update for queue {}", queue_index);
}
}
static bool copy_data_to_chain(VirtIO::QueueChain& chain, Memory::RingBuffer& ring, u8 const* data, size_t length)
{
UserOrKernelBuffer buf = UserOrKernelBuffer::for_kernel_buffer(const_cast<u8*>(data));
size_t offset = 0;
while (offset < length) {
PhysicalAddress start_of_chunk;
size_t length_of_chunk;
VERIFY(ring.copy_data_in(buf, offset, length - offset, start_of_chunk, length_of_chunk));
if (!chain.add_buffer_to_chain(start_of_chunk, length_of_chunk, VirtIO::BufferType::DeviceReadable)) {
// FIXME: Rewind the RingBuffer.
// We are leaving the RingBuffer in an inconsistent state, but interface doesn't allow to undo pushes :(.
return false;
}
offset += length_of_chunk;
}
return true;
}
void VirtIONetworkAdapter::send_raw(ReadonlyBytes payload)
{
dbgln_if(VIRTIO_DEBUG, "VirtIONetworkAdapter: send_raw length={}", payload.size());
auto& queue = get_queue(TRANSMITQ);
SpinlockLocker queue_lock(queue.lock());
VirtIO::QueueChain chain(queue);
SpinlockLocker ringbuffer_lock(m_tx_buffers->lock());
if (m_tx_buffers->available_bytes() < sizeof(VirtIONetHdr) + payload.size()) {
// We can drop packets that don't fit to apply back pressure on eager senders.
dmesgln("VirtIONetworkAdapter: not enough space in the buffer. Dropping packet");
return;
}
// FIXME: Handle errors from pushing to the chain and rewind the RingBuffer.
VirtIONetHdr hdr {};
VERIFY(copy_data_to_chain(chain, *m_tx_buffers, reinterpret_cast<u8*>(&hdr), sizeof(hdr)));
VERIFY(copy_data_to_chain(chain, *m_tx_buffers, payload.data(), payload.size()));
supply_chain_and_notify(TRANSMITQ, chain);
}
}

60
Kernel/Net/VirtIO/VirtIONetworkAdapter.h Normal file
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@ -0,0 +1,60 @@
/*
* Copyright (c) 2023, Kirill Nikolaev <cyril7@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Bus/VirtIO/Device.h>
#include <Kernel/Memory/RingBuffer.h>
#include <Kernel/Net/NetworkAdapter.h>
namespace Kernel {
class VirtIONetworkAdapter
: public VirtIO::Device
, public NetworkAdapter {
public:
static ErrorOr<bool> probe(PCI::DeviceIdentifier const&);
static ErrorOr<NonnullRefPtr<NetworkAdapter>> create(PCI::DeviceIdentifier const&);
virtual ~VirtIONetworkAdapter() override = default;
// VirtIO::Device
virtual ErrorOr<void> initialize_virtio_resources() override;
virtual StringView device_name() const override { return class_name(); }
// NetworkAdapter
virtual StringView class_name() const override { return "VirtIONetworkAdapter"sv; }
virtual Type adapter_type() const override { return Type::Ethernet; }
virtual ErrorOr<void> initialize(Badge<NetworkingManagement>) override;
virtual bool link_up() override { return m_link_up; }
virtual bool link_full_duplex() override { return m_link_duplex; }
virtual i32 link_speed() override { return m_link_speed; }
private:
explicit VirtIONetworkAdapter(PCI::DeviceIdentifier const&, NonnullOwnPtr<KString> interface_name);
// VirtIO::Device
virtual bool handle_device_config_change() override;
virtual void handle_queue_update(u16 queue_index) override;
// NetworkAdapter
virtual void send_raw(ReadonlyBytes) override;
private:
VirtIO::Configuration const* m_device_config { nullptr };
// FIXME: Make atomic as they are read without sync.
// Note that VirtIO::NetworkAdapter may also have the same defect.
bool m_link_up { false };
i32 m_link_speed { LINKSPEED_INVALID };
bool m_link_duplex { false };
OwnPtr<Memory::RingBuffer> m_rx_buffers;
OwnPtr<Memory::RingBuffer> m_tx_buffers;
};
}