pktgen: add benchmark script pktgen_bench_xmit_mode_netif_receive.sh

#!/bin/bash

#

# Benchmark script:

#  - developed for benchmarking ingress qdisc path

#

# Script for injecting packets into RX path of the stack with pktgen

# "xmit_mode netif_receive".  With an invalid dst_mac this will only

# measure the ingress code path as packets gets dropped in ip_rcv().

#

# This script don't really need any hardware.  It benchmarks software

# RX path just after NIC driver level.  With bursting is also

# "removes" the SKB alloc/free overhead.

#

# Setup scenarios for measuring ingress qdisc (with invalid dst_mac):

# ------------------------------------------------------------------

# (1) no ingress (uses static_key_false(&ingress_needed))

#

# (2) ingress on other dev (change ingress_needed and calls

#     handle_ing() but exit early)

#

#  config:  tc qdisc add dev $SOMEDEV handle ffff: ingress

#

# (3) ingress on this dev, handle_ing() -> tc_classify()

#

#  config:  tc qdisc add dev $DEV handle ffff: ingress

#

# (4) ingress on this dev + drop at u32 classifier/action.

#

basedir=`dirname $0`

source ${basedir}/functions.sh

root_check_run_with_sudo "$@"

# Parameter parsing via include

source ${basedir}/parameters.sh

# Using invalid DST_MAC will cause the packets to get dropped in

# ip_rcv() which is part of the test

[ -z "$DEST_IP" ] && DEST_IP="198.18.0.42"

[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"

[ -z "$BURST" ] && BURST=1024

# Base Config

DELAY="0"        # Zero means max speed

COUNT="10000000" # Zero means indefinitely

# General cleanup everything since last run

pg_ctrl "reset"

# Threads are specified with parameter -t value in $THREADS

for ((thread = 0; thread < $THREADS; thread++)); do

    # The device name is extended with @name, using thread number to

    # make then unique, but any name will do.

    dev=${DEV}@${thread}

    # Add remove all other devices and add_device $dev to thread

    pg_thread $thread "rem_device_all"

    pg_thread $thread "add_device" $dev

    # Base config of dev

    pg_set $dev "flag QUEUE_MAP_CPU"

    pg_set $dev "count $COUNT"

    pg_set $dev "pkt_size $PKT_SIZE"

    pg_set $dev "delay $DELAY"

    pg_set $dev "flag NO_TIMESTAMP"

    # Destination

    pg_set $dev "dst_mac $DST_MAC"

    pg_set $dev "dst $DEST_IP"

    # Inject packet into RX path of stack

    pg_set $dev "xmit_mode netif_receive"

    # Burst allow us to avoid measuring SKB alloc/free overhead

    pg_set $dev "burst $BURST"

done

# start_run

echo "Running... ctrl^C to stop" >&2

pg_ctrl "start"

echo "Done" >&2

# Print results

for ((thread = 0; thread < $THREADS; thread++)); do

    dev=${DEV}@${thread}

    echo "Device: $dev"

    cat /proc/net/pktgen/$dev | grep -A2 "Result:"

done