net_dropmonitor.py (1826B)
1# Monitor the system for dropped packets and proudce a report of drop locations and counts 2# SPDX-License-Identifier: GPL-2.0 3 4from __future__ import print_function 5 6import os 7import sys 8 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 kallsyms 21 22 try: 23 f = open("/proc/kallsyms", "r") 24 except: 25 return 26 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 <= start 37 # 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) // 2 41 if loc < kallsyms[pivot][0]: 42 end = pivot 43 else: 44 start = pivot 45 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 = i 60 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 correspoinding event 72def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain, 73 skbaddr, location, protocol): 74 slocation = str(location) 75 try: 76 drop_log[slocation] = drop_log[slocation] + 1 77 except: 78 drop_log[slocation] = 1