1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# Benchmark script:
5#  - developed for benchmarking ingress qdisc path
6#
7# Script for injecting packets into RX path of the stack with pktgen
8# "xmit_mode netif_receive".  With an invalid dst_mac this will only
9# measure the ingress code path as packets gets dropped in ip_rcv().
10#
11# This script don't really need any hardware.  It benchmarks software
12# RX path just after NIC driver level.  With bursting is also
13# "removes" the SKB alloc/free overhead.
14#
15# Setup scenarios for measuring ingress qdisc (with invalid dst_mac):
16# ------------------------------------------------------------------
17# (1) no ingress (uses static_key_false(&ingress_needed))
18#
19# (2) ingress on other dev (change ingress_needed and calls
20#     handle_ing() but exit early)
21#
22#  config:  tc qdisc add dev $SOMEDEV handle ffff: ingress
23#
24# (3) ingress on this dev, handle_ing() -> tc_classify()
25#
26#  config:  tc qdisc add dev $DEV handle ffff: ingress
27#
28# (4) ingress on this dev + drop at u32 classifier/action.
29#
30basedir=`dirname $0`
31source ${basedir}/functions.sh
32root_check_run_with_sudo "$@"
33
34# Parameter parsing via include
35source ${basedir}/parameters.sh
36
37# Trap EXIT first
38trap_exit
39
40# Using invalid DST_MAC will cause the packets to get dropped in
41# ip_rcv() which is part of the test
42if [ -z "$DEST_IP" ]; then
43    [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
44fi
45[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
46[ -z "$BURST" ] && BURST=1024
47[ -z "$COUNT" ] && COUNT="10000000" # Zero means indefinitely
48if [ -n "$DEST_IP" ]; then
49    validate_addr${IP6} $DEST_IP
50    read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
51fi
52if [ -n "$DST_PORT" ]; then
53    read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)
54    validate_ports $UDP_DST_MIN $UDP_DST_MAX
55fi
56
57# General cleanup everything since last run
58pg_ctrl "reset"
59
60# Threads are specified with parameter -t value in $THREADS
61for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
62    # The device name is extended with @name, using thread number to
63    # make then unique, but any name will do.
64    dev=${DEV}@${thread}
65
66    # Add remove all other devices and add_device $dev to thread
67    pg_thread $thread "rem_device_all"
68    pg_thread $thread "add_device" $dev
69
70    # Base config of dev
71    pg_set $dev "flag QUEUE_MAP_CPU"
72    pg_set $dev "count $COUNT"
73    pg_set $dev "pkt_size $PKT_SIZE"
74    pg_set $dev "delay $DELAY"
75    pg_set $dev "flag NO_TIMESTAMP"
76
77    # Destination
78    pg_set $dev "dst_mac $DST_MAC"
79    pg_set $dev "dst${IP6}_min $DST_MIN"
80    pg_set $dev "dst${IP6}_max $DST_MAX"
81
82    if [ -n "$DST_PORT" ]; then
83	# Single destination port or random port range
84	pg_set $dev "flag UDPDST_RND"
85	pg_set $dev "udp_dst_min $UDP_DST_MIN"
86	pg_set $dev "udp_dst_max $UDP_DST_MAX"
87    fi
88
89    # Inject packet into RX path of stack
90    pg_set $dev "xmit_mode netif_receive"
91
92    # Burst allow us to avoid measuring SKB alloc/free overhead
93    pg_set $dev "burst $BURST"
94done
95
96# Run if user hits control-c
97function print_result() {
98    # Print results
99    for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
100        dev=${DEV}@${thread}
101        echo "Device: $dev"
102        cat /proc/net/pktgen/$dev | grep -A2 "Result:"
103    done
104}
105# trap keyboard interrupt (Ctrl-C)
106trap true SIGINT
107
108# start_run
109echo "Running... ctrl^C to stop" >&2
110pg_ctrl "start"
111echo "Done" >&2
112
113print_result
114