net_dropmonitor.py

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# Monitor the system for dropped packets and proudce a report of drop locations and counts

import os
import sys

sys.path.append(os.environ['PERF_EXEC_PATH'] + \
        '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')

from perf_trace_context import *
from Core import *
from Util import *

drop_log = {}
kallsyms = []

def get_kallsyms_table():
    global kallsyms
    try:
        f = open("/proc/kallsyms", "r")
        linecount = 0
        for line in f:
            linecount = linecount+1
        f.seek(0)
    except:
        return


    j = 0
    for line in f:
        loc = int(line.split()[0], 16)
        name = line.split()[2]
        j = j +1
        if ((j % 100) == 0):
            print "\r" + str(j) + "/" + str(linecount),
        kallsyms.append({ 'loc': loc, 'name' : name})

    print "\r" + str(j) + "/" + str(linecount)
    kallsyms.sort()
    return

def get_sym(sloc):
    loc = int(sloc)
    for i in kallsyms:
        if (i['loc'] >= loc):
            return (i['name'], i['loc']-loc)
    return (None, 0)

def print_drop_table():
    print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT")
    for i in drop_log.keys():
        (sym, off) = get_sym(i)
        if sym == None:
            sym = i
        print "%25s %25s %25s" % (sym, off, drop_log[i])


def trace_begin():
    print "Starting trace (Ctrl-C to dump results)"

def trace_end():
    print "Gathering kallsyms data"
    get_kallsyms_table()
    print_drop_table()

# called from perf, when it finds a correspoinding event
def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm,
            skbaddr, protocol, location):
    slocation = str(location)
    try:
        drop_log[slocation] = drop_log[slocation] + 1
    except:
        drop_log[slocation] = 1