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1// SPDX-License-Identifier: GPL-2.02/* Copyright (C) 2023. Huawei Technologies Co., Ltd */3#include <stdbool.h>4#include <errno.h>5#include <linux/types.h>6#include <linux/bpf.h>7#include <bpf/bpf_helpers.h>8#include <bpf/bpf_tracing.h>9 10#define OP_BATCH 6411 12struct update_ctx {13 unsigned int from;14 unsigned int step;15};16 17struct {18 __uint(type, BPF_MAP_TYPE_HASH);19 __uint(key_size, 4);20 __uint(map_flags, BPF_F_NO_PREALLOC);21} htab SEC(".maps");22 23char _license[] SEC("license") = "GPL";24 25unsigned char zeroed_value[4096];26unsigned int nr_thread = 0;27long op_cnt = 0;28 29static int write_htab(unsigned int i, struct update_ctx *ctx, unsigned int flags)30{31 bpf_map_update_elem(&htab, &ctx->from, zeroed_value, flags);32 ctx->from += ctx->step;33 34 return 0;35}36 37static int overwrite_htab(unsigned int i, struct update_ctx *ctx)38{39 return write_htab(i, ctx, 0);40}41 42static int newwrite_htab(unsigned int i, struct update_ctx *ctx)43{44 return write_htab(i, ctx, BPF_NOEXIST);45}46 47static int del_htab(unsigned int i, struct update_ctx *ctx)48{49 bpf_map_delete_elem(&htab, &ctx->from);50 ctx->from += ctx->step;51 52 return 0;53}54 55SEC("?tp/syscalls/sys_enter_getpgid")56int overwrite(void *ctx)57{58 struct update_ctx update;59 60 update.from = bpf_get_smp_processor_id();61 update.step = nr_thread;62 bpf_loop(OP_BATCH, overwrite_htab, &update, 0);63 __sync_fetch_and_add(&op_cnt, 1);64 return 0;65}66 67SEC("?tp/syscalls/sys_enter_getpgid")68int batch_add_batch_del(void *ctx)69{70 struct update_ctx update;71 72 update.from = bpf_get_smp_processor_id();73 update.step = nr_thread;74 bpf_loop(OP_BATCH, overwrite_htab, &update, 0);75 76 update.from = bpf_get_smp_processor_id();77 bpf_loop(OP_BATCH, del_htab, &update, 0);78 79 __sync_fetch_and_add(&op_cnt, 2);80 return 0;81}82 83SEC("?tp/syscalls/sys_enter_getpgid")84int add_only(void *ctx)85{86 struct update_ctx update;87 88 update.from = bpf_get_smp_processor_id() / 2;89 update.step = nr_thread / 2;90 bpf_loop(OP_BATCH, newwrite_htab, &update, 0);91 __sync_fetch_and_add(&op_cnt, 1);92 return 0;93}94 95SEC("?tp/syscalls/sys_enter_getppid")96int del_only(void *ctx)97{98 struct update_ctx update;99 100 update.from = bpf_get_smp_processor_id() / 2;101 update.step = nr_thread / 2;102 bpf_loop(OP_BATCH, del_htab, &update, 0);103 __sync_fetch_and_add(&op_cnt, 1);104 return 0;105}106