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Kernel: Add support for TCP window size scaling

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This should allow us to eventually properly saturate high-bandwidth
network links when using TCP, once other nonoptimal parts of our
network stack are improved.
This commit is contained in:
Idan Horowitz 2023-12-26 21:05:15 +02:00 • committed by Andreas Kling
parent 2c51ff763b
commit 785c9d5c2b
6 changed files with 124 additions and 14 deletions
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17
Kernel/Net/TCPSocket.h
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@ -9,6 +9,7 @@
#include <AK/Error.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <AK/IntegralMath.h>
#include <AK/SinglyLinkedList.h>
#include <AK/Time.h>
#include <Kernel/Library/LockWeakPtr.h>
@ -135,6 +136,12 @@ public:
u32 packets_out() const { return m_packets_out; }
u32 bytes_out() const { return m_bytes_out; }
void set_send_window_scale(size_t scale)
{
m_window_scaling_supported = true;
m_send_window_scale = scale;
}
// FIXME: Make this configurable?
static constexpr u32 maximum_duplicate_acks = 5;
void set_duplicate_acks(u32 acks) { m_duplicate_acks = acks; }
@ -188,6 +195,14 @@ private:
void enqueue_for_retransmit();
void dequeue_for_retransmit();
static constexpr size_t receive_window_scale()
{
auto buffer_size_bit_length = AK::log2(receive_buffer_size) + 1;
if (buffer_size_bit_length < 16)
return 0;
return buffer_size_bit_length - 16;
}
LockWeakPtr<TCPSocket> m_originator;
HashMap<IPv4SocketTuple, NonnullRefPtr<TCPSocket>> m_pending_release_for_accept;
Direction m_direction { Direction::Unspecified };
@ -229,6 +244,8 @@ private:
// Default to maximum window size. receive_tcp_packet() will update from the
// peer's advertised window size.
u32 m_send_window_size { 64 * KiB };
bool m_window_scaling_supported { false };
size_t m_send_window_scale { 0 };
bool m_no_delay { false };