Mercurial > hg > nginx
view src/event/quic/bpf/bpfgen.sh @ 8822:ad046179eb91 quic
QUIC: handle EAGAIN properly on UDP sockets.
Previously, the error was ignored leading to unnecessary retransmits.
Now, unsent frames are returned into output queue, state is reset, and
timer is started for the next send attempt.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Wed, 28 Jul 2021 17:23:18 +0300 |
parents | 7df607cb2d11 |
children |
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#!/bin/bash export LANG=C set -e if [ $# -lt 1 ]; then echo "Usage: PROGNAME=foo LICENSE=bar $0 <bpf object file>" exit 1 fi self=$0 filename=$1 funcname=$PROGNAME generate_head() { cat << END /* AUTO-GENERATED, DO NOT EDIT. */ #include <stddef.h> #include <stdint.h> #include "ngx_bpf.h" END } generate_tail() { cat << END ngx_bpf_program_t $PROGNAME = { .relocs = bpf_reloc_prog_$funcname, .nrelocs = sizeof(bpf_reloc_prog_$funcname) / sizeof(bpf_reloc_prog_$funcname[0]), .ins = bpf_insn_prog_$funcname, .nins = sizeof(bpf_insn_prog_$funcname) / sizeof(bpf_insn_prog_$funcname[0]), .license = "$LICENSE", .type = BPF_PROG_TYPE_SK_REUSEPORT, }; END } process_relocations() { echo "static ngx_bpf_reloc_t bpf_reloc_prog_$funcname[] = {" objdump -r $filename | awk '{ if (enabled && $NF > 0) { off = strtonum(sprintf("0x%s", $1)); name = $3; printf(" { \"%s\", %d },\n", name, off/8); } if ($1 == "OFFSET") { enabled=1; } }' echo "};" echo } process_section() { echo "static struct bpf_insn bpf_insn_prog_$funcname[] = {" echo " /* opcode dst src offset imm */" section_info=$(objdump -h $filename --section=$funcname | grep "1 $funcname") # dd doesn't know hex length=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f3)) offset=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f6)) for ins in $(dd if="$filename" bs=1 count=$length skip=$offset status=none | xxd -p -c 8) do opcode=0x${ins:0:2} srcdst=0x${ins:2:2} # bytes are dumped in LE order offset=0x${ins:6:2}${ins:4:2} # short immedi=0x${ins:14:2}${ins:12:2}${ins:10:2}${ins:8:2} # int dst="$(($srcdst & 0xF))" src="$(($srcdst & 0xF0))" src="$(($src >> 4))" opcode=$(printf "0x%x" $opcode) dst=$(printf "BPF_REG_%d" $dst) src=$(printf "BPF_REG_%d" $src) offset=$(printf "%d" $offset) immedi=$(printf "0x%x" $immedi) printf " { %4s, %11s, %11s, (int16_t) %6s, %10s },\n" $opcode $dst $src $offset $immedi done cat << END }; END } generate_head process_relocations process_section generate_tail