# Display a process of packets and processed time.
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# SPDX-License-Identifier: GPL-2.0
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# It helps us to investigate networking or network device.
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#
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# options
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# tx: show only tx chart
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# rx: show only rx chart
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# dev=: show only thing related to specified device
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# debug: work with debug mode. It shows buffer status.
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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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all_event_list = []; # insert all tracepoint event related with this script
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irq_dic = {}; # key is cpu and value is a list which stacks irqs
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# which raise NET_RX softirq
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net_rx_dic = {}; # key is cpu and value include time of NET_RX softirq-entry
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# and a list which stacks receive
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receive_hunk_list = []; # a list which include a sequence of receive events
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rx_skb_list = []; # received packet list for matching
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# skb_copy_datagram_iovec
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buffer_budget = 65536; # the budget of rx_skb_list, tx_queue_list and
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# tx_xmit_list
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of_count_rx_skb_list = 0; # overflow count
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tx_queue_list = []; # list of packets which pass through dev_queue_xmit
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of_count_tx_queue_list = 0; # overflow count
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tx_xmit_list = []; # list of packets which pass through dev_hard_start_xmit
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of_count_tx_xmit_list = 0; # overflow count
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tx_free_list = []; # list of packets which is freed
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# options
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show_tx = 0;
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show_rx = 0;
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dev = 0; # store a name of device specified by option "dev="
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debug = 0;
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# indices of event_info tuple
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EINFO_IDX_NAME= 0
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EINFO_IDX_CONTEXT=1
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EINFO_IDX_CPU= 2
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EINFO_IDX_TIME= 3
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EINFO_IDX_PID= 4
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EINFO_IDX_COMM= 5
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# Calculate a time interval(msec) from src(nsec) to dst(nsec)
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def diff_msec(src, dst):
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return (dst - src) / 1000000.0
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# Display a process of transmitting a packet
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def print_transmit(hunk):
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if dev != 0 and hunk['dev'].find(dev) < 0:
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return
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print "%7s %5d %6d.%06dsec %12.3fmsec %12.3fmsec" % \
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(hunk['dev'], hunk['len'],
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nsecs_secs(hunk['queue_t']),
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nsecs_nsecs(hunk['queue_t'])/1000,
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diff_msec(hunk['queue_t'], hunk['xmit_t']),
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diff_msec(hunk['xmit_t'], hunk['free_t']))
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# Format for displaying rx packet processing
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PF_IRQ_ENTRY= " irq_entry(+%.3fmsec irq=%d:%s)"
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PF_SOFT_ENTRY=" softirq_entry(+%.3fmsec)"
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PF_NAPI_POLL= " napi_poll_exit(+%.3fmsec %s)"
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PF_JOINT= " |"
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PF_WJOINT= " | |"
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PF_NET_RECV= " |---netif_receive_skb(+%.3fmsec skb=%x len=%d)"
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PF_NET_RX= " |---netif_rx(+%.3fmsec skb=%x)"
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PF_CPY_DGRAM= " | skb_copy_datagram_iovec(+%.3fmsec %d:%s)"
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PF_KFREE_SKB= " | kfree_skb(+%.3fmsec location=%x)"
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PF_CONS_SKB= " | consume_skb(+%.3fmsec)"
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# Display a process of received packets and interrputs associated with
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# a NET_RX softirq
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def print_receive(hunk):
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show_hunk = 0
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irq_list = hunk['irq_list']
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cpu = irq_list[0]['cpu']
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base_t = irq_list[0]['irq_ent_t']
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# check if this hunk should be showed
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if dev != 0:
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for i in range(len(irq_list)):
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if irq_list[i]['name'].find(dev) >= 0:
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show_hunk = 1
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break
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else:
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show_hunk = 1
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if show_hunk == 0:
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return
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print "%d.%06dsec cpu=%d" % \
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(nsecs_secs(base_t), nsecs_nsecs(base_t)/1000, cpu)
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for i in range(len(irq_list)):
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print PF_IRQ_ENTRY % \
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(diff_msec(base_t, irq_list[i]['irq_ent_t']),
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irq_list[i]['irq'], irq_list[i]['name'])
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print PF_JOINT
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irq_event_list = irq_list[i]['event_list']
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for j in range(len(irq_event_list)):
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irq_event = irq_event_list[j]
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if irq_event['event'] == 'netif_rx':
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print PF_NET_RX % \
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(diff_msec(base_t, irq_event['time']),
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irq_event['skbaddr'])
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print PF_JOINT
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print PF_SOFT_ENTRY % \
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diff_msec(base_t, hunk['sirq_ent_t'])
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print PF_JOINT
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event_list = hunk['event_list']
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for i in range(len(event_list)):
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event = event_list[i]
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if event['event_name'] == 'napi_poll':
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print PF_NAPI_POLL % \
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(diff_msec(base_t, event['event_t']), event['dev'])
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if i == len(event_list) - 1:
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print ""
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else:
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print PF_JOINT
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else:
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print PF_NET_RECV % \
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(diff_msec(base_t, event['event_t']), event['skbaddr'],
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event['len'])
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if 'comm' in event.keys():
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print PF_WJOINT
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print PF_CPY_DGRAM % \
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(diff_msec(base_t, event['comm_t']),
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event['pid'], event['comm'])
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elif 'handle' in event.keys():
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print PF_WJOINT
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if event['handle'] == "kfree_skb":
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print PF_KFREE_SKB % \
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(diff_msec(base_t,
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event['comm_t']),
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event['location'])
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elif event['handle'] == "consume_skb":
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print PF_CONS_SKB % \
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diff_msec(base_t,
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event['comm_t'])
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print PF_JOINT
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def trace_begin():
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global show_tx
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global show_rx
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global dev
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global debug
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for i in range(len(sys.argv)):
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if i == 0:
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continue
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arg = sys.argv[i]
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if arg == 'tx':
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show_tx = 1
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elif arg =='rx':
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show_rx = 1
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elif arg.find('dev=',0, 4) >= 0:
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dev = arg[4:]
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elif arg == 'debug':
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debug = 1
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if show_tx == 0 and show_rx == 0:
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show_tx = 1
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show_rx = 1
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def trace_end():
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# order all events in time
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all_event_list.sort(lambda a,b :cmp(a[EINFO_IDX_TIME],
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b[EINFO_IDX_TIME]))
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# process all events
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for i in range(len(all_event_list)):
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event_info = all_event_list[i]
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name = event_info[EINFO_IDX_NAME]
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if name == 'irq__softirq_exit':
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handle_irq_softirq_exit(event_info)
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elif name == 'irq__softirq_entry':
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handle_irq_softirq_entry(event_info)
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elif name == 'irq__softirq_raise':
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handle_irq_softirq_raise(event_info)
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elif name == 'irq__irq_handler_entry':
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handle_irq_handler_entry(event_info)
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elif name == 'irq__irq_handler_exit':
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handle_irq_handler_exit(event_info)
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elif name == 'napi__napi_poll':
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handle_napi_poll(event_info)
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elif name == 'net__netif_receive_skb':
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handle_netif_receive_skb(event_info)
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elif name == 'net__netif_rx':
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handle_netif_rx(event_info)
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elif name == 'skb__skb_copy_datagram_iovec':
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handle_skb_copy_datagram_iovec(event_info)
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elif name == 'net__net_dev_queue':
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handle_net_dev_queue(event_info)
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elif name == 'net__net_dev_xmit':
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handle_net_dev_xmit(event_info)
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elif name == 'skb__kfree_skb':
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handle_kfree_skb(event_info)
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elif name == 'skb__consume_skb':
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handle_consume_skb(event_info)
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# display receive hunks
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if show_rx:
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for i in range(len(receive_hunk_list)):
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print_receive(receive_hunk_list[i])
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# display transmit hunks
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if show_tx:
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print " dev len Qdisc " \
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" netdevice free"
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for i in range(len(tx_free_list)):
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print_transmit(tx_free_list[i])
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if debug:
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print "debug buffer status"
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print "----------------------------"
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print "xmit Qdisc:remain:%d overflow:%d" % \
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(len(tx_queue_list), of_count_tx_queue_list)
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print "xmit netdevice:remain:%d overflow:%d" % \
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(len(tx_xmit_list), of_count_tx_xmit_list)
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print "receive:remain:%d overflow:%d" % \
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(len(rx_skb_list), of_count_rx_skb_list)
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# called from perf, when it finds a correspoinding event
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def irq__softirq_entry(name, context, cpu, sec, nsec, pid, comm, callchain, vec):
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if symbol_str("irq__softirq_entry", "vec", vec) != "NET_RX":
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return
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm, vec)
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all_event_list.append(event_info)
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def irq__softirq_exit(name, context, cpu, sec, nsec, pid, comm, callchain, vec):
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if symbol_str("irq__softirq_entry", "vec", vec) != "NET_RX":
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return
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm, vec)
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all_event_list.append(event_info)
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def irq__softirq_raise(name, context, cpu, sec, nsec, pid, comm, callchain, vec):
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if symbol_str("irq__softirq_entry", "vec", vec) != "NET_RX":
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return
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm, vec)
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all_event_list.append(event_info)
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def irq__irq_handler_entry(name, context, cpu, sec, nsec, pid, comm,
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callchain, irq, irq_name):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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irq, irq_name)
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all_event_list.append(event_info)
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def irq__irq_handler_exit(name, context, cpu, sec, nsec, pid, comm, callchain, irq, ret):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm, irq, ret)
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all_event_list.append(event_info)
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def napi__napi_poll(name, context, cpu, sec, nsec, pid, comm, callchain, napi,
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dev_name, work=None, budget=None):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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napi, dev_name, work, budget)
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all_event_list.append(event_info)
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def net__netif_receive_skb(name, context, cpu, sec, nsec, pid, comm, callchain, skbaddr,
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skblen, dev_name):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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skbaddr, skblen, dev_name)
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all_event_list.append(event_info)
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def net__netif_rx(name, context, cpu, sec, nsec, pid, comm, callchain, skbaddr,
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skblen, dev_name):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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skbaddr, skblen, dev_name)
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all_event_list.append(event_info)
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def net__net_dev_queue(name, context, cpu, sec, nsec, pid, comm, callchain,
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skbaddr, skblen, dev_name):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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skbaddr, skblen, dev_name)
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all_event_list.append(event_info)
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def net__net_dev_xmit(name, context, cpu, sec, nsec, pid, comm, callchain,
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skbaddr, skblen, rc, dev_name):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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skbaddr, skblen, rc ,dev_name)
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all_event_list.append(event_info)
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def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain,
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skbaddr, protocol, location):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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skbaddr, protocol, location)
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all_event_list.append(event_info)
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def skb__consume_skb(name, context, cpu, sec, nsec, pid, comm, callchain, skbaddr):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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skbaddr)
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all_event_list.append(event_info)
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def skb__skb_copy_datagram_iovec(name, context, cpu, sec, nsec, pid, comm, callchain,
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skbaddr, skblen):
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event_info = (name, context, cpu, nsecs(sec, nsec), pid, comm,
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skbaddr, skblen)
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all_event_list.append(event_info)
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def handle_irq_handler_entry(event_info):
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(name, context, cpu, time, pid, comm, irq, irq_name) = event_info
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if cpu not in irq_dic.keys():
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irq_dic[cpu] = []
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irq_record = {'irq':irq, 'name':irq_name, 'cpu':cpu, 'irq_ent_t':time}
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irq_dic[cpu].append(irq_record)
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def handle_irq_handler_exit(event_info):
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(name, context, cpu, time, pid, comm, irq, ret) = event_info
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if cpu not in irq_dic.keys():
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return
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irq_record = irq_dic[cpu].pop()
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if irq != irq_record['irq']:
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return
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irq_record.update({'irq_ext_t':time})
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# if an irq doesn't include NET_RX softirq, drop.
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if 'event_list' in irq_record.keys():
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irq_dic[cpu].append(irq_record)
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def handle_irq_softirq_raise(event_info):
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(name, context, cpu, time, pid, comm, vec) = event_info
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if cpu not in irq_dic.keys() \
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or len(irq_dic[cpu]) == 0:
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return
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irq_record = irq_dic[cpu].pop()
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if 'event_list' in irq_record.keys():
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irq_event_list = irq_record['event_list']
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else:
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irq_event_list = []
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irq_event_list.append({'time':time, 'event':'sirq_raise'})
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irq_record.update({'event_list':irq_event_list})
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irq_dic[cpu].append(irq_record)
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def handle_irq_softirq_entry(event_info):
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(name, context, cpu, time, pid, comm, vec) = event_info
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net_rx_dic[cpu] = {'sirq_ent_t':time, 'event_list':[]}
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def handle_irq_softirq_exit(event_info):
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(name, context, cpu, time, pid, comm, vec) = event_info
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irq_list = []
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event_list = 0
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if cpu in irq_dic.keys():
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irq_list = irq_dic[cpu]
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del irq_dic[cpu]
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if cpu in net_rx_dic.keys():
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sirq_ent_t = net_rx_dic[cpu]['sirq_ent_t']
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event_list = net_rx_dic[cpu]['event_list']
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del net_rx_dic[cpu]
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if irq_list == [] or event_list == 0:
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return
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rec_data = {'sirq_ent_t':sirq_ent_t, 'sirq_ext_t':time,
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'irq_list':irq_list, 'event_list':event_list}
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# merge information realted to a NET_RX softirq
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receive_hunk_list.append(rec_data)
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def handle_napi_poll(event_info):
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(name, context, cpu, time, pid, comm, napi, dev_name,
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work, budget) = event_info
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if cpu in net_rx_dic.keys():
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event_list = net_rx_dic[cpu]['event_list']
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rec_data = {'event_name':'napi_poll',
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'dev':dev_name, 'event_t':time,
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'work':work, 'budget':budget}
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event_list.append(rec_data)
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def handle_netif_rx(event_info):
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(name, context, cpu, time, pid, comm,
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skbaddr, skblen, dev_name) = event_info
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if cpu not in irq_dic.keys() \
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or len(irq_dic[cpu]) == 0:
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return
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irq_record = irq_dic[cpu].pop()
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if 'event_list' in irq_record.keys():
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irq_event_list = irq_record['event_list']
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else:
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irq_event_list = []
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irq_event_list.append({'time':time, 'event':'netif_rx',
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'skbaddr':skbaddr, 'skblen':skblen, 'dev_name':dev_name})
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irq_record.update({'event_list':irq_event_list})
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irq_dic[cpu].append(irq_record)
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def handle_netif_receive_skb(event_info):
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global of_count_rx_skb_list
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(name, context, cpu, time, pid, comm,
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skbaddr, skblen, dev_name) = event_info
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if cpu in net_rx_dic.keys():
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rec_data = {'event_name':'netif_receive_skb',
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'event_t':time, 'skbaddr':skbaddr, 'len':skblen}
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event_list = net_rx_dic[cpu]['event_list']
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event_list.append(rec_data)
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rx_skb_list.insert(0, rec_data)
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if len(rx_skb_list) > buffer_budget:
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rx_skb_list.pop()
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of_count_rx_skb_list += 1
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def handle_net_dev_queue(event_info):
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global of_count_tx_queue_list
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(name, context, cpu, time, pid, comm,
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skbaddr, skblen, dev_name) = event_info
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skb = {'dev':dev_name, 'skbaddr':skbaddr, 'len':skblen, 'queue_t':time}
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tx_queue_list.insert(0, skb)
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if len(tx_queue_list) > buffer_budget:
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tx_queue_list.pop()
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of_count_tx_queue_list += 1
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def handle_net_dev_xmit(event_info):
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global of_count_tx_xmit_list
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(name, context, cpu, time, pid, comm,
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skbaddr, skblen, rc, dev_name) = event_info
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if rc == 0: # NETDEV_TX_OK
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for i in range(len(tx_queue_list)):
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skb = tx_queue_list[i]
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if skb['skbaddr'] == skbaddr:
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skb['xmit_t'] = time
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tx_xmit_list.insert(0, skb)
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del tx_queue_list[i]
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if len(tx_xmit_list) > buffer_budget:
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tx_xmit_list.pop()
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of_count_tx_xmit_list += 1
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return
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def handle_kfree_skb(event_info):
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(name, context, cpu, time, pid, comm,
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skbaddr, protocol, location) = event_info
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for i in range(len(tx_queue_list)):
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skb = tx_queue_list[i]
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if skb['skbaddr'] == skbaddr:
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del tx_queue_list[i]
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return
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for i in range(len(tx_xmit_list)):
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skb = tx_xmit_list[i]
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if skb['skbaddr'] == skbaddr:
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skb['free_t'] = time
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tx_free_list.append(skb)
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del tx_xmit_list[i]
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return
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for i in range(len(rx_skb_list)):
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rec_data = rx_skb_list[i]
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if rec_data['skbaddr'] == skbaddr:
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rec_data.update({'handle':"kfree_skb",
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'comm':comm, 'pid':pid, 'comm_t':time})
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del rx_skb_list[i]
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return
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def handle_consume_skb(event_info):
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(name, context, cpu, time, pid, comm, skbaddr) = event_info
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for i in range(len(tx_xmit_list)):
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skb = tx_xmit_list[i]
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if skb['skbaddr'] == skbaddr:
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skb['free_t'] = time
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tx_free_list.append(skb)
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del tx_xmit_list[i]
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return
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def handle_skb_copy_datagram_iovec(event_info):
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(name, context, cpu, time, pid, comm, skbaddr, skblen) = event_info
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for i in range(len(rx_skb_list)):
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rec_data = rx_skb_list[i]
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if skbaddr == rec_data['skbaddr']:
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rec_data.update({'handle':"skb_copy_datagram_iovec",
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'comm':comm, 'pid':pid, 'comm_t':time})
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del rx_skb_list[i]
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return
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