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