Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# extended toeplitz test: test rxhash plus, optionally, either (1) rss mapping
5# from rxhash to rx queue ('-rss') or (2) rps mapping from rxhash to cpu
6# ('-rps <rps_map>')
7#
8# irq-pattern-prefix can be derived from /sys/kernel/irq/*/action,
9# which is a driver-specific encoding.
10#
11# invoke as ./toeplitz.sh (-i <iface>) -u|-t -4|-6 \
12# [(-rss -irq_prefix <irq-pattern-prefix>)|(-rps <rps_map>)]
13
14source setup_loopback.sh
15readonly SERVER_IP4="192.168.1.200/24"
16readonly SERVER_IP6="fda8::1/64"
17readonly SERVER_MAC="aa:00:00:00:00:02"
18
19readonly CLIENT_IP4="192.168.1.100/24"
20readonly CLIENT_IP6="fda8::2/64"
21readonly CLIENT_MAC="aa:00:00:00:00:01"
22
23PORT=8000
24KEY="$(</proc/sys/net/core/netdev_rss_key)"
25TEST_RSS=false
26RPS_MAP=""
27PROTO_FLAG=""
28IP_FLAG=""
29DEV="eth0"
30
31# Return the number of rxqs among which RSS is configured to spread packets.
32# This is determined by reading the RSS indirection table using ethtool.
33get_rss_cfg_num_rxqs() {
34 echo $(ethtool -x "${DEV}" |
35 grep -E [[:space:]]+[0-9]+:[[:space:]]+ |
36 cut -d: -f2- |
37 awk '{$1=$1};1' |
38 tr ' ' '\n' |
39 sort -u |
40 wc -l)
41}
42
43# Return a list of the receive irq handler cpus.
44# The list is ordered by the irqs, so first rxq-0 cpu, then rxq-1 cpu, etc.
45# Reads /sys/kernel/irq/ in order, so algorithm depends on
46# irq_{rxq-0} < irq_{rxq-1}, etc.
47get_rx_irq_cpus() {
48 CPUS=""
49 # sort so that irq 2 is read before irq 10
50 SORTED_IRQS=$(for i in /sys/kernel/irq/*; do echo $i; done | sort -V)
51 # Consider only as many queues as RSS actually uses. We assume that
52 # if RSS_CFG_NUM_RXQS=N, then RSS uses rxqs 0-(N-1).
53 RSS_CFG_NUM_RXQS=$(get_rss_cfg_num_rxqs)
54 RXQ_COUNT=0
55
56 for i in ${SORTED_IRQS}
57 do
58 [[ "${RXQ_COUNT}" -lt "${RSS_CFG_NUM_RXQS}" ]] || break
59 # lookup relevant IRQs by action name
60 [[ -e "$i/actions" ]] || continue
61 cat "$i/actions" | grep -q "${IRQ_PATTERN}" || continue
62 irqname=$(<"$i/actions")
63
64 # does the IRQ get called
65 irqcount=$(cat "$i/per_cpu_count" | tr -d '0,')
66 [[ -n "${irqcount}" ]] || continue
67
68 # lookup CPU
69 irq=$(basename "$i")
70 cpu=$(cat "/proc/irq/$irq/smp_affinity_list")
71
72 if [[ -z "${CPUS}" ]]; then
73 CPUS="${cpu}"
74 else
75 CPUS="${CPUS},${cpu}"
76 fi
77 RXQ_COUNT=$((RXQ_COUNT+1))
78 done
79
80 echo "${CPUS}"
81}
82
83get_disable_rfs_cmd() {
84 echo "echo 0 > /proc/sys/net/core/rps_sock_flow_entries;"
85}
86
87get_set_rps_bitmaps_cmd() {
88 CMD=""
89 for i in /sys/class/net/${DEV}/queues/rx-*/rps_cpus
90 do
91 CMD="${CMD} echo $1 > ${i};"
92 done
93
94 echo "${CMD}"
95}
96
97get_disable_rps_cmd() {
98 echo "$(get_set_rps_bitmaps_cmd 0)"
99}
100
101die() {
102 echo "$1"
103 exit 1
104}
105
106check_nic_rxhash_enabled() {
107 local -r pattern="receive-hashing:\ on"
108
109 ethtool -k "${DEV}" | grep -q "${pattern}" || die "rxhash must be enabled"
110}
111
112parse_opts() {
113 local prog=$0
114 shift 1
115
116 while [[ "$1" =~ "-" ]]; do
117 if [[ "$1" = "-irq_prefix" ]]; then
118 shift
119 IRQ_PATTERN="^$1-[0-9]*$"
120 elif [[ "$1" = "-u" || "$1" = "-t" ]]; then
121 PROTO_FLAG="$1"
122 elif [[ "$1" = "-4" ]]; then
123 IP_FLAG="$1"
124 SERVER_IP="${SERVER_IP4}"
125 CLIENT_IP="${CLIENT_IP4}"
126 elif [[ "$1" = "-6" ]]; then
127 IP_FLAG="$1"
128 SERVER_IP="${SERVER_IP6}"
129 CLIENT_IP="${CLIENT_IP6}"
130 elif [[ "$1" = "-rss" ]]; then
131 TEST_RSS=true
132 elif [[ "$1" = "-rps" ]]; then
133 shift
134 RPS_MAP="$1"
135 elif [[ "$1" = "-i" ]]; then
136 shift
137 DEV="$1"
138 else
139 die "Usage: ${prog} (-i <iface>) -u|-t -4|-6 \
140 [(-rss -irq_prefix <irq-pattern-prefix>)|(-rps <rps_map>)]"
141 fi
142 shift
143 done
144}
145
146setup() {
147 setup_loopback_environment "${DEV}"
148
149 # Set up server_ns namespace and client_ns namespace
150 setup_macvlan_ns "${DEV}" server_ns server \
151 "${SERVER_MAC}" "${SERVER_IP}"
152 setup_macvlan_ns "${DEV}" client_ns client \
153 "${CLIENT_MAC}" "${CLIENT_IP}"
154}
155
156cleanup() {
157 cleanup_macvlan_ns server_ns server client_ns client
158 cleanup_loopback "${DEV}"
159}
160
161parse_opts $0 $@
162
163setup
164trap cleanup EXIT
165
166check_nic_rxhash_enabled
167
168# Actual test starts here
169if [[ "${TEST_RSS}" = true ]]; then
170 # RPS/RFS must be disabled because they move packets between cpus,
171 # which breaks the PACKET_FANOUT_CPU identification of RSS decisions.
172 eval "$(get_disable_rfs_cmd) $(get_disable_rps_cmd)" \
173 ip netns exec server_ns ./toeplitz "${IP_FLAG}" "${PROTO_FLAG}" \
174 -d "${PORT}" -i "${DEV}" -k "${KEY}" -T 1000 \
175 -C "$(get_rx_irq_cpus)" -s -v &
176elif [[ ! -z "${RPS_MAP}" ]]; then
177 eval "$(get_disable_rfs_cmd) $(get_set_rps_bitmaps_cmd ${RPS_MAP})" \
178 ip netns exec server_ns ./toeplitz "${IP_FLAG}" "${PROTO_FLAG}" \
179 -d "${PORT}" -i "${DEV}" -k "${KEY}" -T 1000 \
180 -r "0x${RPS_MAP}" -s -v &
181else
182 ip netns exec server_ns ./toeplitz "${IP_FLAG}" "${PROTO_FLAG}" \
183 -d "${PORT}" -i "${DEV}" -k "${KEY}" -T 1000 -s -v &
184fi
185
186server_pid=$!
187
188ip netns exec client_ns ./toeplitz_client.sh "${PROTO_FLAG}" \
189 "${IP_FLAG}" "${SERVER_IP%%/*}" "${PORT}" &
190
191client_pid=$!
192
193wait "${server_pid}"
194exit_code=$?
195kill -9 "${client_pid}"
196if [[ "${exit_code}" -eq 0 ]]; then
197 echo "Test Succeeded!"
198fi
199exit "${exit_code}"