Mercurial > hg > nginx-quic
view src/core/ngx_bpf.c @ 9067:f68fdb017141 quic
QUIC: optimized sending stream response.
When a stream is created by client, it's often the case that nginx will send
immediate response on that stream. An example is HTTP/3 request stream, which
in most cases quickly replies with at least HTTP headers.
QUIC stream init handlers are called from a posted event. Output QUIC
frames are also sent to client from a posted event, called the push event.
If the push event is posted before the stream init event, then output produced
by stream may trigger sending an extra UDP datagram. To address this, push
event is now re-posted when a new stream init event is posted.
An example is handling 0-RTT packets. Client typically sends an init packet
coalesced with a 0-RTT packet. Previously, nginx replied with a padded CRYPTO
datagram, followed by a 1-RTT stream reply datagram. Now CRYPTO and STREAM
packets are coalesced in one reply datagram, which saves bandwidth.
Other examples include coalescing 1-RTT first stream response, and
MAX_STREAMS/STREAM sent in response to ACK/STREAM.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Mon, 03 Apr 2023 16:17:12 +0400 |
parents | 7a07724256c2 |
children |
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/* * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #define NGX_BPF_LOGBUF_SIZE (16 * 1024) static ngx_inline int ngx_bpf(enum bpf_cmd cmd, union bpf_attr *attr, unsigned int size) { return syscall(__NR_bpf, cmd, attr, size); } void ngx_bpf_program_link(ngx_bpf_program_t *program, const char *symbol, int fd) { ngx_uint_t i; ngx_bpf_reloc_t *rl; rl = program->relocs; for (i = 0; i < program->nrelocs; i++) { if (ngx_strcmp(rl[i].name, symbol) == 0) { program->ins[rl[i].offset].src_reg = 1; program->ins[rl[i].offset].imm = fd; } } } int ngx_bpf_load_program(ngx_log_t *log, ngx_bpf_program_t *program) { int fd; union bpf_attr attr; #if (NGX_DEBUG) char buf[NGX_BPF_LOGBUF_SIZE]; #endif ngx_memzero(&attr, sizeof(union bpf_attr)); attr.license = (uintptr_t) program->license; attr.prog_type = program->type; attr.insns = (uintptr_t) program->ins; attr.insn_cnt = program->nins; #if (NGX_DEBUG) /* for verifier errors */ attr.log_buf = (uintptr_t) buf; attr.log_size = NGX_BPF_LOGBUF_SIZE; attr.log_level = 1; #endif fd = ngx_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); if (fd < 0) { ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "failed to load BPF program"); ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, "bpf verifier: %s", buf); return -1; } return fd; } int ngx_bpf_map_create(ngx_log_t *log, enum bpf_map_type type, int key_size, int value_size, int max_entries, uint32_t map_flags) { int fd; union bpf_attr attr; ngx_memzero(&attr, sizeof(union bpf_attr)); attr.map_type = type; attr.key_size = key_size; attr.value_size = value_size; attr.max_entries = max_entries; attr.map_flags = map_flags; fd = ngx_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); if (fd < 0) { ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "failed to create BPF map"); return NGX_ERROR; } return fd; } int ngx_bpf_map_update(int fd, const void *key, const void *value, uint64_t flags) { union bpf_attr attr; ngx_memzero(&attr, sizeof(union bpf_attr)); attr.map_fd = fd; attr.key = (uintptr_t) key; attr.value = (uintptr_t) value; attr.flags = flags; return ngx_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); } int ngx_bpf_map_delete(int fd, const void *key) { union bpf_attr attr; ngx_memzero(&attr, sizeof(union bpf_attr)); attr.map_fd = fd; attr.key = (uintptr_t) key; return ngx_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); } int ngx_bpf_map_lookup(int fd, const void *key, void *value) { union bpf_attr attr; ngx_memzero(&attr, sizeof(union bpf_attr)); attr.map_fd = fd; attr.key = (uintptr_t) key; attr.value = (uintptr_t) value; return ngx_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); }