xref: /linux/samples/pktgen/pktgen_bench_xmit_mode_netif_receive.sh (revision b85d45947951d23cb22d90caecf4c1eb81342c96) 
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 ${basedir}/parameters.sh
35# Using invalid DST_MAC will cause the packets to get dropped in
36# ip_rcv() which is part of the test
37[ -z "$DEST_IP" ] && DEST_IP="198.18.0.42"
38[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
39[ -z "$BURST" ] && BURST=1024
40
41# Base Config
42DELAY="0"        # Zero means max speed
43COUNT="10000000" # Zero means indefinitely
44
45# General cleanup everything since last run
46pg_ctrl "reset"
47
48# Threads are specified with parameter -t value in $THREADS
49for ((thread = 0; thread < $THREADS; thread++)); do
50    # The device name is extended with @name, using thread number to
51    # make then unique, but any name will do.
52    dev=${DEV}@${thread}
53
54    # Add remove all other devices and add_device $dev to thread
55    pg_thread $thread "rem_device_all"
56    pg_thread $thread "add_device" $dev
57
58    # Base config of dev
59    pg_set $dev "flag QUEUE_MAP_CPU"
60    pg_set $dev "count $COUNT"
61    pg_set $dev "pkt_size $PKT_SIZE"
62    pg_set $dev "delay $DELAY"
63    pg_set $dev "flag NO_TIMESTAMP"
64
65    # Destination
66    pg_set $dev "dst_mac $DST_MAC"
67    pg_set $dev "dst $DEST_IP"
68
69    # Inject packet into RX path of stack
70    pg_set $dev "xmit_mode netif_receive"
71
72    # Burst allow us to avoid measuring SKB alloc/free overhead
73    pg_set $dev "burst $BURST"
74done
75
76# start_run
77echo "Running... ctrl^C to stop" >&2
78pg_ctrl "start"
79echo "Done" >&2
80
81# Print results
82for ((thread = 0; thread < $THREADS; thread++)); do
83    dev=${DEV}@${thread}
84    echo "Device: $dev"
85    cat /proc/net/pktgen/$dev | grep -A2 "Result:"
86done
87