Mercurial > hg > nginx-quic
annotate src/core/ngx_bpf.c @ 8759:56dec0d4e5b1 quic
QUIC: avoid excessive buffer allocations in stream output.
Previously, when a few bytes were send to a QUIC stream by the application, a
4K buffer was allocated for these bytes. Then a STREAM frame was created and
that entire buffer was used as data for that frame. The frame with the buffer
were in use up until the frame was acked by client. Meanwhile, when more
bytes were send to the stream, more buffers were allocated and assigned as
data to newer STREAM frames. In this scenario most buffer memory is unused.
Now the unused part of the stream output buffer is available for further
stream output while earlier parts of the buffer are waiting to be acked.
This is achieved by splitting the output buffer.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Fri, 24 Dec 2021 18:13:51 +0300 |
parents | 7a07724256c2 |
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rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Nginx, Inc. |
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4 */ |
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5 |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 |
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10 #define NGX_BPF_LOGBUF_SIZE (16 * 1024) |
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11 |
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12 |
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13 static ngx_inline int |
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14 ngx_bpf(enum bpf_cmd cmd, union bpf_attr *attr, unsigned int size) |
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15 { |
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16 return syscall(__NR_bpf, cmd, attr, size); |
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17 } |
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18 |
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19 |
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20 void |
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21 ngx_bpf_program_link(ngx_bpf_program_t *program, const char *symbol, int fd) |
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22 { |
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23 ngx_uint_t i; |
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24 ngx_bpf_reloc_t *rl; |
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25 |
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26 rl = program->relocs; |
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27 |
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28 for (i = 0; i < program->nrelocs; i++) { |
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29 if (ngx_strcmp(rl[i].name, symbol) == 0) { |
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30 program->ins[rl[i].offset].src_reg = 1; |
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31 program->ins[rl[i].offset].imm = fd; |
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32 } |
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33 } |
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34 } |
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35 |
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36 |
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37 int |
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38 ngx_bpf_load_program(ngx_log_t *log, ngx_bpf_program_t *program) |
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39 { |
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40 int fd; |
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41 union bpf_attr attr; |
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42 #if (NGX_DEBUG) |
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43 char buf[NGX_BPF_LOGBUF_SIZE]; |
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44 #endif |
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45 |
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46 ngx_memzero(&attr, sizeof(union bpf_attr)); |
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47 |
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48 attr.license = (uintptr_t) program->license; |
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49 attr.prog_type = program->type; |
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50 attr.insns = (uintptr_t) program->ins; |
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51 attr.insn_cnt = program->nins; |
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52 |
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53 #if (NGX_DEBUG) |
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54 /* for verifier errors */ |
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55 attr.log_buf = (uintptr_t) buf; |
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56 attr.log_size = NGX_BPF_LOGBUF_SIZE; |
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57 attr.log_level = 1; |
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58 #endif |
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59 |
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60 fd = ngx_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); |
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61 if (fd < 0) { |
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62 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, |
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63 "failed to load BPF program"); |
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64 |
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65 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, |
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66 "bpf verifier: %s", buf); |
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67 |
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68 return -1; |
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69 } |
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70 |
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71 return fd; |
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72 } |
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73 |
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74 |
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75 int |
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76 ngx_bpf_map_create(ngx_log_t *log, enum bpf_map_type type, int key_size, |
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77 int value_size, int max_entries, uint32_t map_flags) |
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78 { |
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79 int fd; |
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80 union bpf_attr attr; |
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81 |
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82 ngx_memzero(&attr, sizeof(union bpf_attr)); |
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83 |
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84 attr.map_type = type; |
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85 attr.key_size = key_size; |
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86 attr.value_size = value_size; |
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87 attr.max_entries = max_entries; |
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88 attr.map_flags = map_flags; |
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89 |
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90 fd = ngx_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); |
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91 if (fd < 0) { |
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92 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, |
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93 "failed to create BPF map"); |
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94 return NGX_ERROR; |
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95 } |
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96 |
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97 return fd; |
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98 } |
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99 |
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100 |
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101 int |
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102 ngx_bpf_map_update(int fd, const void *key, const void *value, uint64_t flags) |
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103 { |
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104 union bpf_attr attr; |
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105 |
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106 ngx_memzero(&attr, sizeof(union bpf_attr)); |
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107 |
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108 attr.map_fd = fd; |
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109 attr.key = (uintptr_t) key; |
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110 attr.value = (uintptr_t) value; |
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111 attr.flags = flags; |
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112 |
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113 return ngx_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); |
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114 } |
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115 |
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116 |
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117 int |
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118 ngx_bpf_map_delete(int fd, const void *key) |
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119 { |
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120 union bpf_attr attr; |
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121 |
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122 ngx_memzero(&attr, sizeof(union bpf_attr)); |
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123 |
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124 attr.map_fd = fd; |
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125 attr.key = (uintptr_t) key; |
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126 |
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127 return ngx_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); |
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128 } |
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129 |
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130 |
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131 int |
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132 ngx_bpf_map_lookup(int fd, const void *key, void *value) |
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133 { |
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134 union bpf_attr attr; |
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135 |
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136 ngx_memzero(&attr, sizeof(union bpf_attr)); |
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137 |
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138 attr.map_fd = fd; |
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139 attr.key = (uintptr_t) key; |
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140 attr.value = (uintptr_t) value; |
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141 |
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142 return ngx_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); |
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143 } |