Mercurial > hg > nginx-quic
annotate src/core/ngx_crc.h @ 7870:e169cce912c7 quic
Avoid retransmitting of packets with discarded keys.
Sections 4.10.1 and 4.10.2 of quic transport describe discarding of initial
and handshake keys. Since the keys are discarded, we no longer need
to retransmit packets and corresponding queues should be emptied.
This patch removes previously added workaround that did not require
acknowledgement for initial packets, resulting in avoiding retransmission,
which is wrong because a packet could be lost and we have to retransmit it.
author | Vladimir Homutov <vl@nginx.com> |
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date | Mon, 18 May 2020 13:54:53 +0300 |
parents | d620f497c50f |
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rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #ifndef _NGX_CRC_H_INCLUDED_ |
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9 #define _NGX_CRC_H_INCLUDED_ |
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792 | 12 #include <ngx_config.h> |
13 #include <ngx_core.h> | |
14 | |
15 | |
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16 /* 32-bit crc16 */ |
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17 |
776 | 18 static ngx_inline uint32_t |
789 | 19 ngx_crc(u_char *data, size_t len) |
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20 { |
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21 uint32_t sum; |
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23 for (sum = 0; len; len--) { |
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25 /* |
776 | 26 * gcc 2.95.2 x86 and icc 7.1.006 compile |
27 * that operator into the single "rol" opcode, | |
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28 * msvc 6.0sp2 compiles it into four opcodes. |
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29 */ |
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30 sum = sum >> 1 | sum << 31; |
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31 |
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32 sum += *data++; |
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33 } |
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34 |
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35 return sum; |
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36 } |
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38 |
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39 #endif /* _NGX_CRC_H_INCLUDED_ */ |