79 lines · python
1# Monitor the system for dropped packets and proudce a report of drop locations and counts2# SPDX-License-Identifier: GPL-2.03 4from __future__ import print_function5 6import os7import sys8 9sys.path.append(os.environ['PERF_EXEC_PATH'] + \10 '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')11 12from perf_trace_context import *13from Core import *14from Util import *15 16drop_log = {}17kallsyms = []18 19def get_kallsyms_table():20 global kallsyms21 22 try:23 f = open("/proc/kallsyms", "r")24 except:25 return26 27 for line in f:28 loc = int(line.split()[0], 16)29 name = line.split()[2]30 kallsyms.append((loc, name))31 kallsyms.sort()32 33def get_sym(sloc):34 loc = int(sloc)35 36 # Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start37 # kallsyms[i][0] > loc for all end <= i < len(kallsyms)38 start, end = -1, len(kallsyms)39 while end != start + 1:40 pivot = (start + end) // 241 if loc < kallsyms[pivot][0]:42 end = pivot43 else:44 start = pivot45 46 # Now (start == -1 or kallsyms[start][0] <= loc)47 # and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0])48 if start >= 0:49 symloc, name = kallsyms[start]50 return (name, loc - symloc)51 else:52 return (None, 0)53 54def print_drop_table():55 print("%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT"))56 for i in drop_log.keys():57 (sym, off) = get_sym(i)58 if sym == None:59 sym = i60 print("%25s %25s %25s" % (sym, off, drop_log[i]))61 62 63def trace_begin():64 print("Starting trace (Ctrl-C to dump results)")65 66def trace_end():67 print("Gathering kallsyms data")68 get_kallsyms_table()69 print_drop_table()70 71# called from perf, when it finds a corresponding event72def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain,73 skbaddr, location, protocol, reason):74 slocation = str(location)75 try:76 drop_log[slocation] = drop_log[slocation] + 177 except:78 drop_log[slocation] = 179