tests/python/test_percpu.py

#!/usr/bin/env python
# Copyright (c) PLUMgrid, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")

import os
import unittest
from bcc import BPF
import multiprocessing

class TestPercpu(unittest.TestCase):

    def setUp(self):
        try:
            b = BPF(text='BPF_TABLE("percpu_array", u32, u32, stub, 1);')
        except:
            raise unittest.SkipTest("PerCpu unsupported on this kernel")

    def test_helper(self):
        test_prog1 = """
        BPF_PERCPU_ARRAY(stub_default);
        BPF_PERCPU_ARRAY(stub_type, u64);
        BPF_PERCPU_ARRAY(stub_full, u64, 1024);
        """
        BPF(text=test_prog1)

    def test_u64(self):
        test_prog1 = """
        BPF_TABLE("percpu_hash", u32, u64, stats, 1);
        int hello_world(void *ctx) {
            u32 key=0;
            u64 value = 0, *val;
            val = stats.lookup_or_init(&key, &value);
            *val += 1;
            return 0;
        }
        """
        bpf_code = BPF(text=test_prog1)
        stats_map = bpf_code.get_table("stats")
        bpf_code.attach_kprobe(event="sys_clone", fn_name="hello_world")
        ini = stats_map.Leaf()
        for i in range(0, multiprocessing.cpu_count()):
            ini[i] = 0
        stats_map[ stats_map.Key(0) ] = ini
        f = os.popen("hostname")
        f.close()
        self.assertEqual(len(stats_map),1)
        val = stats_map[ stats_map.Key(0) ]
        sum = stats_map.sum(stats_map.Key(0))
        avg = stats_map.average(stats_map.Key(0))
        max = stats_map.max(stats_map.Key(0))
        self.assertGreater(sum.value, int(0))
        self.assertGreater(max.value, int(0))
        bpf_code.detach_kprobe("sys_clone")

    def test_u32(self):
        test_prog1 = """
        BPF_TABLE("percpu_array", u32, u32, stats, 1);
        int hello_world(void *ctx) {
            u32 key=0;
            u32 value = 0, *val;
            val = stats.lookup_or_init(&key, &value);
            *val += 1;
            return 0;
        }
        """
        bpf_code = BPF(text=test_prog1)
        stats_map = bpf_code.get_table("stats")
        bpf_code.attach_kprobe(event="sys_clone", fn_name="hello_world")
        ini = stats_map.Leaf()
        for i in range(0, multiprocessing.cpu_count()):
            ini[i] = 0
        stats_map[ stats_map.Key(0) ] = ini
        f = os.popen("hostname")
        f.close()
        self.assertEqual(len(stats_map),1)
        val = stats_map[ stats_map.Key(0) ]
        sum = stats_map.sum(stats_map.Key(0))
        avg = stats_map.average(stats_map.Key(0))
        max = stats_map.max(stats_map.Key(0))
        self.assertGreater(sum.value, int(0))
        self.assertGreater(max.value, int(0))
        bpf_code.detach_kprobe("sys_clone")

    def test_struct_custom_func(self):
        test_prog2 = """
        typedef struct counter {
        u32 c1;
        u32 c2;
        } counter;
        BPF_TABLE("percpu_hash", u32, counter, stats, 1);
        int hello_world(void *ctx) {
            u32 key=0;
            counter value = {0,0}, *val;
            val = stats.lookup_or_init(&key, &value);
            val->c1 += 1;
            val->c2 += 1;
            return 0;
        }
        """
        bpf_code = BPF(text=test_prog2)
        stats_map = bpf_code.get_table("stats",
                reducer=lambda x,y: stats_map.sLeaf(x.c1+y.c1))
        bpf_code.attach_kprobe(event="sys_clone", fn_name="hello_world")
        ini = stats_map.Leaf()
        for i in ini:
            i = stats_map.sLeaf(0,0)
        stats_map[ stats_map.Key(0) ] = ini
        f = os.popen("hostname")
        f.close()
        self.assertEqual(len(stats_map),1)
        k = stats_map[ stats_map.Key(0) ]
        self.assertGreater(k.c1, int(0))
        bpf_code.detach_kprobe("sys_clone")


if __name__ == "__main__":
    unittest.main()