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annotate src/event/quic/ngx_event_quic_output.h @ 9143:48691bab4474

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QUIC: fixed probe-congestion deadlock. When probe timeout expired while congestion window was exhausted, probe PINGs could not be sent. As a result, lost packets could not be declared lost and congestion window could not be freed for new packets. This deadlock continued until connection idle timeout expiration. Now PINGs are sent separately from the frame queue without congestion control, as specified by RFC 9002, Section 7: An endpoint MUST NOT send a packet if it would cause bytes_in_flight (see Appendix B.2) to be larger than the congestion window, unless the packet is sent on a PTO timer expiration (see Section 6.2) or when entering recovery (see Section 7.3.2).
author Roman Arutyunyan <arut@nginx.com>
date Mon, 14 Aug 2023 08:28:30 +0400
parents 501f28679d56
children 58afcd72446f
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2 /*
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3 * Copyright (C) Nginx, Inc.
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4 */
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7 #ifndef _NGX_EVENT_QUIC_OUTPUT_H_INCLUDED_
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8 #define _NGX_EVENT_QUIC_OUTPUT_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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15 size_t ngx_quic_max_udp_payload(ngx_connection_t *c);
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17 ngx_int_t ngx_quic_output(ngx_connection_t *c);
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19 ngx_int_t ngx_quic_negotiate_version(ngx_connection_t *c,
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20 ngx_quic_header_t *inpkt);
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22 ngx_int_t ngx_quic_send_stateless_reset(ngx_connection_t *c,
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23 ngx_quic_conf_t *conf, ngx_quic_header_t *pkt);
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24 ngx_int_t ngx_quic_send_cc(ngx_connection_t *c);
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25 ngx_int_t ngx_quic_send_early_cc(ngx_connection_t *c,
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26 ngx_quic_header_t *inpkt, ngx_uint_t err, const char *reason);
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28 ngx_int_t ngx_quic_send_retry(ngx_connection_t *c,
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29 ngx_quic_conf_t *conf, ngx_quic_header_t *pkt);
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30 ngx_int_t ngx_quic_send_new_token(ngx_connection_t *c, ngx_quic_path_t *path);
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32 ngx_int_t ngx_quic_send_ack(ngx_connection_t *c,
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33 ngx_quic_send_ctx_t *ctx);
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34 ngx_int_t ngx_quic_send_ack_range(ngx_connection_t *c,
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35 ngx_quic_send_ctx_t *ctx, uint64_t smallest, uint64_t largest);
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37 ngx_int_t ngx_quic_frame_sendto(ngx_connection_t *c, ngx_quic_frame_t *frame,
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38 size_t min, ngx_quic_path_t *path);
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40 #endif /* _NGX_EVENT_QUIC_OUTPUT_H_INCLUDED_ */