1 # Monitor the system for dropped packets and proudce a report of drop locations and counts 2 # SPDX-License-Identifier: GPL-2.0 3 4 import os 5 import sys 6 7 sys.path.append(os.environ['PERF_EXEC_PATH'] + \ 8 '/scripts/python/Perf-Trace-Util/lib/Perf/Trace') 9 10 from perf_trace_context import * 11 from Core import * 12 from Util import * 13 14 drop_log = {} 15 kallsyms = [] 16 17 def get_kallsyms_table(): 18 global kallsyms 19 20 try: 21 f = open("/proc/kallsyms", "r") 22 except: 23 return 24 25 for line in f: 26 loc = int(line.split()[0], 16) 27 name = line.split()[2] 28 kallsyms.append((loc, name)) 29 kallsyms.sort() 30 31 def get_sym(sloc): 32 loc = int(sloc) 33 34 # Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start 35 # kallsyms[i][0] > loc for all end <= i < len(kallsyms) 36 start, end = -1, len(kallsyms) 37 while end != start + 1: 38 pivot = (start + end) // 2 39 if loc < kallsyms[pivot][0]: 40 end = pivot 41 else: 42 start = pivot 43 44 # Now (start == -1 or kallsyms[start][0] <= loc) 45 # and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0]) 46 if start >= 0: 47 symloc, name = kallsyms[start] 48 return (name, loc - symloc) 49 else: 50 return (None, 0) 51 52 def print_drop_table(): 53 print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT") 54 for i in drop_log.keys(): 55 (sym, off) = get_sym(i) 56 if sym == None: 57 sym = i 58 print "%25s %25s %25s" % (sym, off, drop_log[i]) 59 60 61 def trace_begin(): 62 print "Starting trace (Ctrl-C to dump results)" 63 64 def trace_end(): 65 print "Gathering kallsyms data" 66 get_kallsyms_table() 67 print_drop_table() 68 69 # called from perf, when it finds a correspoinding event 70 def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain, 71 skbaddr, location, protocol): 72 slocation = str(location) 73 try: 74 drop_log[slocation] = drop_log[slocation] + 1 75 except: 76 drop_log[slocation] = 1 77