CasperSecurity
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# extended toeplitz test: test rxhash plus, optionally, either (1) rss mapping
# from rxhash to rx queue ('-rss') or (2) rps mapping from rxhash to cpu
# ('-rps <rps_map>')
#
# irq-pattern-prefix can be derived from /sys/kernel/irq/*/action,
# which is a driver-specific encoding.
#
# invoke as ./toeplitz.sh (-i <iface>) -u|-t -4|-6 \
# [(-rss -irq_prefix <irq-pattern-prefix>)|(-rps <rps_map>)]
source setup_loopback.sh
readonly SERVER_IP4="192.168.1.200/24"
readonly SERVER_IP6="fda8::1/64"
readonly SERVER_MAC="aa:00:00:00:00:02"
readonly CLIENT_IP4="192.168.1.100/24"
readonly CLIENT_IP6="fda8::2/64"
readonly CLIENT_MAC="aa:00:00:00:00:01"
PORT=8000
KEY="$(</proc/sys/net/core/netdev_rss_key)"
TEST_RSS=false
RPS_MAP=""
PROTO_FLAG=""
IP_FLAG=""
DEV="eth0"
# Return the number of rxqs among which RSS is configured to spread packets.
# This is determined by reading the RSS indirection table using ethtool.
get_rss_cfg_num_rxqs() {
echo $(ethtool -x "${DEV}" |
grep -E [[:space:]]+[0-9]+:[[:space:]]+ |
cut -d: -f2- |
awk '{$1=$1};1' |
tr ' ' '\n' |
sort -u |
wc -l)
}
# Return a list of the receive irq handler cpus.
# The list is ordered by the irqs, so first rxq-0 cpu, then rxq-1 cpu, etc.
# Reads /sys/kernel/irq/ in order, so algorithm depends on
# irq_{rxq-0} < irq_{rxq-1}, etc.
get_rx_irq_cpus() {
CPUS=""
# sort so that irq 2 is read before irq 10
SORTED_IRQS=$(for i in /sys/kernel/irq/*; do echo $i; done | sort -V)
# Consider only as many queues as RSS actually uses. We assume that
# if RSS_CFG_NUM_RXQS=N, then RSS uses rxqs 0-(N-1).
RSS_CFG_NUM_RXQS=$(get_rss_cfg_num_rxqs)
RXQ_COUNT=0
for i in ${SORTED_IRQS}
do
[[ "${RXQ_COUNT}" -lt "${RSS_CFG_NUM_RXQS}" ]] || break
# lookup relevant IRQs by action name
[[ -e "$i/actions" ]] || continue
cat "$i/actions" | grep -q "${IRQ_PATTERN}" || continue
irqname=$(<"$i/actions")
# does the IRQ get called
irqcount=$(cat "$i/per_cpu_count" | tr -d '0,')
[[ -n "${irqcount}" ]] || continue
# lookup CPU
irq=$(basename "$i")
cpu=$(cat "/proc/irq/$irq/smp_affinity_list")
if [[ -z "${CPUS}" ]]; then
CPUS="${cpu}"
else
CPUS="${CPUS},${cpu}"
fi
RXQ_COUNT=$((RXQ_COUNT+1))
done
echo "${CPUS}"
}
get_disable_rfs_cmd() {
echo "echo 0 > /proc/sys/net/core/rps_sock_flow_entries;"
}
get_set_rps_bitmaps_cmd() {
CMD=""
for i in /sys/class/net/${DEV}/queues/rx-*/rps_cpus
do
CMD="${CMD} echo $1 > ${i};"
done
echo "${CMD}"
}
get_disable_rps_cmd() {
echo "$(get_set_rps_bitmaps_cmd 0)"
}
die() {
echo "$1"
exit 1
}
check_nic_rxhash_enabled() {
local -r pattern="receive-hashing:\ on"
ethtool -k "${DEV}" | grep -q "${pattern}" || die "rxhash must be enabled"
}
parse_opts() {
local prog=$0
shift 1
while [[ "$1" =~ "-" ]]; do
if [[ "$1" = "-irq_prefix" ]]; then
shift
IRQ_PATTERN="^$1-[0-9]*$"
elif [[ "$1" = "-u" || "$1" = "-t" ]]; then
PROTO_FLAG="$1"
elif [[ "$1" = "-4" ]]; then
IP_FLAG="$1"
SERVER_IP="${SERVER_IP4}"
CLIENT_IP="${CLIENT_IP4}"
elif [[ "$1" = "-6" ]]; then
IP_FLAG="$1"
SERVER_IP="${SERVER_IP6}"
CLIENT_IP="${CLIENT_IP6}"
elif [[ "$1" = "-rss" ]]; then
TEST_RSS=true
elif [[ "$1" = "-rps" ]]; then
shift
RPS_MAP="$1"
elif [[ "$1" = "-i" ]]; then
shift
DEV="$1"
else
die "Usage: ${prog} (-i <iface>) -u|-t -4|-6 \
[(-rss -irq_prefix <irq-pattern-prefix>)|(-rps <rps_map>)]"
fi
shift
done
}
setup() {
setup_loopback_environment "${DEV}"
# Set up server_ns namespace and client_ns namespace
setup_macvlan_ns "${DEV}" server_ns server \
"${SERVER_MAC}" "${SERVER_IP}"
setup_macvlan_ns "${DEV}" client_ns client \
"${CLIENT_MAC}" "${CLIENT_IP}"
}
cleanup() {
cleanup_macvlan_ns server_ns server client_ns client
cleanup_loopback "${DEV}"
}
parse_opts $0 $@
setup
trap cleanup EXIT
check_nic_rxhash_enabled
# Actual test starts here
if [[ "${TEST_RSS}" = true ]]; then
# RPS/RFS must be disabled because they move packets between cpus,
# which breaks the PACKET_FANOUT_CPU identification of RSS decisions.
eval "$(get_disable_rfs_cmd) $(get_disable_rps_cmd)" \
ip netns exec server_ns ./toeplitz "${IP_FLAG}" "${PROTO_FLAG}" \
-d "${PORT}" -i "${DEV}" -k "${KEY}" -T 1000 \
-C "$(get_rx_irq_cpus)" -s -v &
elif [[ ! -z "${RPS_MAP}" ]]; then
eval "$(get_disable_rfs_cmd) $(get_set_rps_bitmaps_cmd ${RPS_MAP})" \
ip netns exec server_ns ./toeplitz "${IP_FLAG}" "${PROTO_FLAG}" \
-d "${PORT}" -i "${DEV}" -k "${KEY}" -T 1000 \
-r "0x${RPS_MAP}" -s -v &
else
ip netns exec server_ns ./toeplitz "${IP_FLAG}" "${PROTO_FLAG}" \
-d "${PORT}" -i "${DEV}" -k "${KEY}" -T 1000 -s -v &
fi
server_pid=$!
ip netns exec client_ns ./toeplitz_client.sh "${PROTO_FLAG}" \
"${IP_FLAG}" "${SERVER_IP%%/*}" "${PORT}" &
client_pid=$!
wait "${server_pid}"
exit_code=$?
kill -9 "${client_pid}"
if [[ "${exit_code}" -eq 0 ]]; then
echo "Test Succeeded!"
fi
exit "${exit_code}"