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 ${basedir}/parameters.sh
36# Using invalid DST_MAC will cause the packets to get dropped in
37# ip_rcv() which is part of the test
38if [ -z "$DEST_IP" ]; then
39    [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
40fi
41[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
42[ -z "$BURST" ] && BURST=1024
43[ -z "$COUNT" ] && COUNT="10000000" # Zero means indefinitely
44
45# Base Config
46DELAY="0"        # Zero means max speed
47
48# General cleanup everything since last run
49pg_ctrl "reset"
50
51# Threads are specified with parameter -t value in $THREADS
52for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
53    # The device name is extended with @name, using thread number to
54    # make then unique, but any name will do.
55    dev=${DEV}@${thread}
56
57    # Add remove all other devices and add_device $dev to thread
58    pg_thread $thread "rem_device_all"
59    pg_thread $thread "add_device" $dev
60
61    # Base config of dev
62    pg_set $dev "flag QUEUE_MAP_CPU"
63    pg_set $dev "count $COUNT"
64    pg_set $dev "pkt_size $PKT_SIZE"
65    pg_set $dev "delay $DELAY"
66    pg_set $dev "flag NO_TIMESTAMP"
67
68    # Destination
69    pg_set $dev "dst_mac $DST_MAC"
70    pg_set $dev "dst$IP6 $DEST_IP"
71
72    # Inject packet into RX path of stack
73    pg_set $dev "xmit_mode netif_receive"
74
75    # Burst allow us to avoid measuring SKB alloc/free overhead
76    pg_set $dev "burst $BURST"
77done
78
79# start_run
80echo "Running... ctrl^C to stop" >&2
81pg_ctrl "start"
82echo "Done" >&2
83
84# Print results
85for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
86    dev=${DEV}@${thread}
87    echo "Device: $dev"
88    cat /proc/net/pktgen/$dev | grep -A2 "Result:"
89done
90