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Kernel: Add support for TCP window size scaling
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.
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commit
785c9d5c2b
6 changed files with 124 additions and 14 deletions
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@ -9,6 +9,7 @@
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#include <AK/Error.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <AK/IntegralMath.h>
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#include <AK/SinglyLinkedList.h>
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#include <AK/Time.h>
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#include <Kernel/Library/LockWeakPtr.h>
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@ -135,6 +136,12 @@ public:
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u32 packets_out() const { return m_packets_out; }
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u32 bytes_out() const { return m_bytes_out; }
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void set_send_window_scale(size_t scale)
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{
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m_window_scaling_supported = true;
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m_send_window_scale = scale;
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}
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// FIXME: Make this configurable?
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static constexpr u32 maximum_duplicate_acks = 5;
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void set_duplicate_acks(u32 acks) { m_duplicate_acks = acks; }
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@ -188,6 +195,14 @@ private:
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void enqueue_for_retransmit();
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void dequeue_for_retransmit();
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static constexpr size_t receive_window_scale()
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{
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auto buffer_size_bit_length = AK::log2(receive_buffer_size) + 1;
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if (buffer_size_bit_length < 16)
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return 0;
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return buffer_size_bit_length - 16;
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}
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LockWeakPtr<TCPSocket> m_originator;
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HashMap<IPv4SocketTuple, NonnullRefPtr<TCPSocket>> m_pending_release_for_accept;
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Direction m_direction { Direction::Unspecified };
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@ -229,6 +244,8 @@ private:
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// Default to maximum window size. receive_tcp_packet() will update from the
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// peer's advertised window size.
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u32 m_send_window_size { 64 * KiB };
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bool m_window_scaling_supported { false };
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size_t m_send_window_scale { 0 };
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bool m_no_delay { false };
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