# Monitor the system for dropped packets and proudce a report of drop locations and counts
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# SPDX-License-Identifier: GPL-2.0
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from __future__ import print_function
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import os
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import sys
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sys.path.append(os.environ['PERF_EXEC_PATH'] + \
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'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
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from perf_trace_context import *
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from Core import *
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from Util import *
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drop_log = {}
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kallsyms = []
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def get_kallsyms_table():
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global kallsyms
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try:
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f = open("/proc/kallsyms", "r")
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except:
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return
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for line in f:
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loc = int(line.split()[0], 16)
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name = line.split()[2]
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kallsyms.append((loc, name))
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kallsyms.sort()
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def get_sym(sloc):
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loc = int(sloc)
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# Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start
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# kallsyms[i][0] > loc for all end <= i < len(kallsyms)
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start, end = -1, len(kallsyms)
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while end != start + 1:
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pivot = (start + end) // 2
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if loc < kallsyms[pivot][0]:
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end = pivot
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else:
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start = pivot
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# Now (start == -1 or kallsyms[start][0] <= loc)
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# and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0])
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if start >= 0:
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symloc, name = kallsyms[start]
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return (name, loc - symloc)
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else:
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return (None, 0)
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def print_drop_table():
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print("%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT"))
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for i in drop_log.keys():
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(sym, off) = get_sym(i)
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if sym == None:
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sym = i
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print("%25s %25s %25s" % (sym, off, drop_log[i]))
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def trace_begin():
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print("Starting trace (Ctrl-C to dump results)")
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def trace_end():
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print("Gathering kallsyms data")
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get_kallsyms_table()
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print_drop_table()
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# called from perf, when it finds a correspoinding event
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def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain,
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skbaddr, location, protocol):
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slocation = str(location)
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try:
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drop_log[slocation] = drop_log[slocation] + 1
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except:
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drop_log[slocation] = 1
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