xref: /linux/samples/pktgen/pktgen_bench_xmit_mode_netif_receive.sh (revision e5c86679d5e864947a52fb31e45a425dea3e7fa9) 
1#!/bin/bash
2#
3# Benchmark script:
4#  - developed for benchmarking ingress qdisc path
5#
6# Script for injecting packets into RX path of the stack with pktgen
7# "xmit_mode netif_receive".  With an invalid dst_mac this will only
8# measure the ingress code path as packets gets dropped in ip_rcv().
9#
10# This script don't really need any hardware.  It benchmarks software
11# RX path just after NIC driver level.  With bursting is also
12# "removes" the SKB alloc/free overhead.
13#
14# Setup scenarios for measuring ingress qdisc (with invalid dst_mac):
15# ------------------------------------------------------------------
16# (1) no ingress (uses static_key_false(&ingress_needed))
17#
18# (2) ingress on other dev (change ingress_needed and calls
19#     handle_ing() but exit early)
20#
21#  config:  tc qdisc add dev $SOMEDEV handle ffff: ingress
22#
23# (3) ingress on this dev, handle_ing() -> tc_classify()
24#
25#  config:  tc qdisc add dev $DEV handle ffff: ingress
26#
27# (4) ingress on this dev + drop at u32 classifier/action.
28#
29basedir=`dirname $0`
30source ${basedir}/functions.sh
31root_check_run_with_sudo "$@"
32
33# Parameter parsing via include
34source ${basedir}/parameters.sh
35# Using invalid DST_MAC will cause the packets to get dropped in
36# ip_rcv() which is part of the test
37if [ -z "$DEST_IP" ]; then
38    [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
39fi
40[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
41[ -z "$BURST" ] && BURST=1024
42
43# Base Config
44DELAY="0"        # Zero means max speed
45COUNT="10000000" # Zero means indefinitely
46
47# General cleanup everything since last run
48pg_ctrl "reset"
49
50# Threads are specified with parameter -t value in $THREADS
51for ((thread = 0; thread < $THREADS; thread++)); do
52    # The device name is extended with @name, using thread number to
53    # make then unique, but any name will do.
54    dev=${DEV}@${thread}
55
56    # Add remove all other devices and add_device $dev to thread
57    pg_thread $thread "rem_device_all"
58    pg_thread $thread "add_device" $dev
59
60    # Base config of dev
61    pg_set $dev "flag QUEUE_MAP_CPU"
62    pg_set $dev "count $COUNT"
63    pg_set $dev "pkt_size $PKT_SIZE"
64    pg_set $dev "delay $DELAY"
65    pg_set $dev "flag NO_TIMESTAMP"
66
67    # Destination
68    pg_set $dev "dst_mac $DST_MAC"
69    pg_set $dev "dst$IP6 $DEST_IP"
70
71    # Inject packet into RX path of stack
72    pg_set $dev "xmit_mode netif_receive"
73
74    # Burst allow us to avoid measuring SKB alloc/free overhead
75    pg_set $dev "burst $BURST"
76done
77
78# start_run
79echo "Running... ctrl^C to stop" >&2
80pg_ctrl "start"
81echo "Done" >&2
82
83# Print results
84for ((thread = 0; thread < $THREADS; thread++)); do
85    dev=${DEV}@${thread}
86    echo "Device: $dev"
87    cat /proc/net/pktgen/$dev | grep -A2 "Result:"
88done
89