1// SPDX-License-Identifier: GPL-2.0 2/* 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 64 11 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