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Merge pull request #414 from paullouisageneau/sctp-max-burst

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Add SCTP max burst setting
This commit is contained in:
Paul-Louis Ageneau
2021-04-26 21:31:47 +02:00
committed by GitHub
parent 2bf03205cf 07a5591cda
commit ce9fa374d0
4 changed files with 22 additions and 11 deletions
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12
include/rtc/global.hpp
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@ -46,11 +46,13 @@ RTC_EXPORT void Preload();
RTC_EXPORT void Cleanup();
struct SctpSettings {
optional<size_t> recvBufferSize;
optional<size_t> sendBufferSize;
optional<size_t> maxChunksOnQueue;
optional<size_t> initialCongestionWindow;
optional<unsigned int> congestionControlModule;
// For the following settings, not set means optimized default
optional<size_t> recvBufferSize; // in bytes
optional<size_t> sendBufferSize; // in bytes
optional<size_t> maxChunksOnQueue; // in chunks
optional<size_t> initialCongestionWindow; // in MTUs
optional<size_t> maxBurst; // in MTUs
optional<unsigned int> congestionControlModule; // 0: RFC2581, 1: HSTCP, 2: H-TCP, 3: RTCC
optional<std::chrono::milliseconds> delayedSackTime;
};

13
include/rtc/rtc.h
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@ -222,12 +222,13 @@ RTC_EXPORT int rtcGetTrackDescription(int tr, char *buffer, int size);
// SCTP settings
typedef struct {
int recvBufferSize; // <= 0 means optimized default
int sendBufferSize; // <= 0 means optimized default
int maxChunksOnQueue; // <= 0 means optimized default
int initialCongestionWindow; // <= 0 means optimized default
int congestionControlModule; // <= 0 means default (0: RFC2581, 1: HSTCP, 2: H-TCP, 3: RTCC)
int delayedSackTimeMs; // <= 0 means optimized default
int recvBufferSize; // in bytes, <= 0 means optimized default
int sendBufferSize; // in bytes, <= 0 means optimized default
int maxChunksOnQueue; // in chunks, <= 0 means optimized default
int initialCongestionWindow; // in MTUs, <= 0 means optimized default
int maxBurst; // in MTUs, 0 means optimized default, < 0 means disabled
int congestionControlModule; // 0: RFC2581 (default), 1: HSTCP, 2: H-TCP, 3: RTCC
int delayedSackTimeMs; // in msecs, <= 0 means optimized default
} rtcSctpSettings;
// Note: SCTP settings apply to newly-created PeerConnections only

5
src/capi.cpp
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@ -683,6 +683,11 @@ int rtcSetSctpSettings(const rtcSctpSettings *settings) {
if (settings->initialCongestionWindow > 0)
s.initialCongestionWindow = size_t(settings->initialCongestionWindow);
if (settings->maxBurst > 0)
s.maxBurst = size_t(settings->maxBurst);
else if (settings->maxBurst < 0)
s.maxBurst = size_t(0); // setting to 0 disables, not setting chooses optimized default
if (settings->congestionControlModule >= 0)
s.congestionControlModule = unsigned(settings->congestionControlModule);

3
src/impl/sctptransport.cpp
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@ -115,6 +115,9 @@ void SctpTransport::SetSettings(const SctpSettings &s) {
// Increase initial congestion window size to 10 MTUs (RFC 6928) by default
usrsctp_sysctl_set_sctp_initial_cwnd(to_uint32(s.initialCongestionWindow.value_or(10)));
// Set max burst to 10 MTUs by default (max burst is initially 0, meaning disabled)
usrsctp_sysctl_set_sctp_max_burst_default(to_uint32(s.maxBurst.value_or(10)));
// Use standard SCTP congestion control (RFC 4960) by default
// See https://github.com/paullouisageneau/libdatachannel/issues/354
usrsctp_sysctl_set_sctp_default_cc_module(to_uint32(s.congestionControlModule.value_or(0)));