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 #
30 basedir=`dirname $0`
31 source ${basedir}/functions.sh
32 root_check_run_with_sudo "$@"
33
34 # Parameter parsing via include
35 source ${basedir}/parameters.sh
36
37 # Trap EXIT first
38 trap_exit
39
40 # Using invalid DST_MAC will cause the packets to get dropped in
41 # ip_rcv() which is part of the test
42 if [ -z "$DEST_IP" ]; then
43 [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
44 fi
45 [ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
46 [ -z "$BURST" ] && BURST=1024
47 [ -z "$COUNT" ] && COUNT="10000000" # Zero means indefinitely
48 if [ -n "$DEST_IP" ]; then
49 validate_addr${IP6} $DEST_IP
50 read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
51 fi
52 if [ -n "$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
55 fi
56
57 # General cleanup everything since last run
58 pg_ctrl "reset"
59
60 # Threads are specified with parameter -t value in $THREADS
61 for ((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"
94 done
95
96 # Run if user hits control-c
97 function 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)
106 trap true SIGINT
107
108 # start_run
109 echo "Running... ctrl^C to stop" >&2
110 pg_ctrl "start"
111 echo "Done" >&2
112
113 print_result
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