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selftests: rds: add testing infrastructure

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This adds some basic self-testing infrastructure for RDS-TCP.

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vegard Nossum 2024-08-06 08:38:09 -07:00 committed by David S. Miller
parent bc75dcc3ce
commit 3ade6ce125
8 changed files with 605 additions and 0 deletions
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11
Documentation/dev-tools/gcov.rst
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@ -75,6 +75,17 @@ Only files which are linked to the main kernel image or are compiled as
kernel modules are supported by this mechanism.
Module specific configs
-----------------------
Gcov kernel configs for specific modules are described below:
CONFIG_GCOV_PROFILE_RDS:
Enables GCOV profiling on RDS for checking which functions or
lines are executed. This config is used by the rds selftest to
generate coverage reports. If left unset the report is omitted.
Files
-----

1
MAINTAINERS
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@ -19197,6 +19197,7 @@ S: Supported
W: https://oss.oracle.com/projects/rds/
F: Documentation/networking/rds.rst
F: net/rds/
F: tools/testing/selftests/net/rds/
RDT - RESOURCE ALLOCATION
M: Fenghua Yu <fenghua.yu@intel.com>

1
tools/testing/selftests/Makefile
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@ -68,6 +68,7 @@ TARGETS += net/mptcp
TARGETS += net/openvswitch
TARGETS += net/tcp_ao
TARGETS += net/netfilter
TARGETS += net/rds
TARGETS += nsfs
TARGETS += perf_events
TARGETS += pidfd

12
tools/testing/selftests/net/rds/Makefile Normal file
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@ -0,0 +1,12 @@
# SPDX-License-Identifier: GPL-2.0
all:
@echo mk_build_dir="$(shell pwd)" > include.sh
TEST_PROGS := run.sh \
include.sh \
test.py
EXTRA_CLEAN := /tmp/rds_logs
include ../../lib.mk

41
tools/testing/selftests/net/rds/README.txt Normal file
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@ -0,0 +1,41 @@
RDS self-tests
==============
These scripts provide a coverage test for RDS-TCP by creating two
network namespaces and running rds packets between them. A loopback
network is provisioned with optional probability of packet loss or
corruption. A workload of 50000 hashes, each 64 characters in size,
are passed over an RDS socket on this test network. A passing test means
the RDS-TCP stack was able to recover properly. The provided config.sh
can be used to compile the kernel with the necessary gcov options. The
kernel may optionally be configured to omit the coverage report as well.
USAGE:
run.sh [-d logdir] [-l packet_loss] [-c packet_corruption]
[-u packet_duplcate]
OPTIONS:
-d Log directory. Defaults to tools/testing/selftests/net/rds/rds_logs
-l Simulates a percentage of packet loss
-c Simulates a percentage of packet corruption
-u Simulates a percentage of packet duplication.
EXAMPLE:
# Create a suitable gcov enabled .config
tools/testing/selftests/net/rds/config.sh -g
# Alternatly create a gcov disabled .config
tools/testing/selftests/net/rds/config.sh
# build the kernel
vng --build --config tools/testing/selftests/net/config
# launch the tests in a VM
vng -v --rwdir ./ --run . --user root --cpus 4 -- \
"export PYTHONPATH=tools/testing/selftests/net/; tools/testing/selftests/net/rds/run.sh"
An HTML coverage report will be output in tools/testing/selftests/net/rds/rds_logs/coverage/.

53
tools/testing/selftests/net/rds/config.sh Executable file
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@ -0,0 +1,53 @@
#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
set -e
set -u
set -x
unset KBUILD_OUTPUT
GENERATE_GCOV_REPORT=0
while getopts "g" opt; do
case ${opt} in
g)
GENERATE_GCOV_REPORT=1
;;
:)
echo "USAGE: config.sh [-g]"
exit 1
;;
?)
echo "Invalid option: -${OPTARG}."
exit 1
;;
esac
done
CONF_FILE="tools/testing/selftests/net/config"
# no modules
scripts/config --file "$CONF_FILE" --disable CONFIG_MODULES
# enable RDS
scripts/config --file "$CONF_FILE" --enable CONFIG_RDS
scripts/config --file "$CONF_FILE" --enable CONFIG_RDS_TCP
if [ "$GENERATE_GCOV_REPORT" -eq 1 ]; then
# instrument RDS and only RDS
scripts/config --file "$CONF_FILE" --enable CONFIG_GCOV_KERNEL
scripts/config --file "$CONF_FILE" --disable GCOV_PROFILE_ALL
scripts/config --file "$CONF_FILE" --enable GCOV_PROFILE_RDS
else
scripts/config --file "$CONF_FILE" --disable CONFIG_GCOV_KERNEL
scripts/config --file "$CONF_FILE" --disable GCOV_PROFILE_ALL
scripts/config --file "$CONF_FILE" --disable GCOV_PROFILE_RDS
fi
# need network namespaces to run tests with veth network interfaces
scripts/config --file "$CONF_FILE" --enable CONFIG_NET_NS
scripts/config --file "$CONF_FILE" --enable CONFIG_VETH
# simulate packet loss
scripts/config --file "$CONF_FILE" --enable CONFIG_NET_SCH_NETEM

224
tools/testing/selftests/net/rds/run.sh Executable file
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@ -0,0 +1,224 @@
#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
set -e
set -u
unset KBUILD_OUTPUT
current_dir="$(realpath "$(dirname "$0")")"
build_dir="$current_dir"
build_include="$current_dir/include.sh"
if test -f "$build_include"; then
# this include will define "$mk_build_dir" as the location the test was
# built. We will need this if the tests are installed in a location
# other than the kernel source
source "$build_include"
build_dir="$mk_build_dir"
fi
# This test requires kernel source and the *.gcda data therein
# Locate the top level of the kernel source, and the net/rds
# subfolder with the appropriate *.gcno object files
ksrc_dir="$(realpath "$build_dir"/../../../../../)"
kconfig="$ksrc_dir/.config"
obj_dir="$ksrc_dir/net/rds"
GCOV_CMD=gcov
#check to see if the host has the required packages to generate a gcov report
check_gcov_env()
{
if ! which "$GCOV_CMD" > /dev/null 2>&1; then
echo "Warning: Could not find gcov. "
GENERATE_GCOV_REPORT=0
return
fi
# the gcov version must match the gcc version
GCC_VER=$(gcc -dumpfullversion)
GCOV_VER=$($GCOV_CMD -v | grep gcov | awk '{print $3}'| awk 'BEGIN {FS="-"}{print $1}')
if [ "$GCOV_VER" != "$GCC_VER" ]; then
#attempt to find a matching gcov version
GCOV_CMD=gcov-$(gcc -dumpversion)
if ! which "$GCOV_CMD" > /dev/null 2>&1; then
echo "Warning: Could not find an appropriate gcov installation. \
gcov version must match gcc version"
GENERATE_GCOV_REPORT=0
return
fi
#recheck version number of found gcov executable
GCOV_VER=$($GCOV_CMD -v | grep gcov | awk '{print $3}'| \
awk 'BEGIN {FS="-"}{print $1}')
if [ "$GCOV_VER" != "$GCC_VER" ]; then
echo "Warning: Could not find an appropriate gcov installation. \
gcov version must match gcc version"
GENERATE_GCOV_REPORT=0
else
echo "Warning: Mismatched gcc and gcov detected. Using $GCOV_CMD"
fi
fi
}
# Check to see if the kconfig has the required configs to generate a coverage report
check_gcov_conf()
{
if ! grep -x "CONFIG_GCOV_PROFILE_RDS=y" "$kconfig" > /dev/null 2>&1; then
echo "INFO: CONFIG_GCOV_PROFILE_RDS should be enabled for coverage reports"
GENERATE_GCOV_REPORT=0
fi
if ! grep -x "CONFIG_GCOV_KERNEL=y" "$kconfig" > /dev/null 2>&1; then
echo "INFO: CONFIG_GCOV_KERNEL should be enabled for coverage reports"
GENERATE_GCOV_REPORT=0
fi
if grep -x "CONFIG_GCOV_PROFILE_ALL=y" "$kconfig" > /dev/null 2>&1; then
echo "INFO: CONFIG_GCOV_PROFILE_ALL should be disabled for coverage reports"
GENERATE_GCOV_REPORT=0
fi
if [ "$GENERATE_GCOV_REPORT" -eq 0 ]; then
echo "To enable gcov reports, please run "\
"\"tools/testing/selftests/net/rds/config.sh -g\" and rebuild the kernel"
else
# if we have the required kernel configs, proceed to check the environment to
# ensure we have the required gcov packages
check_gcov_env
fi
}
# Kselftest framework requirement - SKIP code is 4.
check_conf_enabled() {
if ! grep -x "$1=y" "$kconfig" > /dev/null 2>&1; then
echo "selftests: [SKIP] This test requires $1 enabled"
echo "Please run tools/testing/selftests/net/rds/config.sh and rebuild the kernel"
exit 4
fi
}
check_conf_disabled() {
if grep -x "$1=y" "$kconfig" > /dev/null 2>&1; then
echo "selftests: [SKIP] This test requires $1 disabled"
echo "Please run tools/testing/selftests/net/rds/config.sh and rebuild the kernel"
exit 4
fi
}
check_conf() {
check_conf_enabled CONFIG_NET_SCH_NETEM
check_conf_enabled CONFIG_VETH
check_conf_enabled CONFIG_NET_NS
check_conf_enabled CONFIG_RDS_TCP
check_conf_enabled CONFIG_RDS
check_conf_disabled CONFIG_MODULES
}
check_env()
{
if ! test -d "$obj_dir"; then
echo "selftests: [SKIP] This test requires a kernel source tree"
exit 4
fi
if ! test -e "$kconfig"; then
echo "selftests: [SKIP] This test requires a configured kernel source tree"
exit 4
fi
if ! which strace > /dev/null 2>&1; then
echo "selftests: [SKIP] Could not run test without strace"
exit 4
fi
if ! which tcpdump > /dev/null 2>&1; then
echo "selftests: [SKIP] Could not run test without tcpdump"
exit 4
fi
if ! which python3 > /dev/null 2>&1; then
echo "selftests: [SKIP] Could not run test without python3"
exit 4
fi
python_major=$(python3 -c "import sys; print(sys.version_info[0])")
python_minor=$(python3 -c "import sys; print(sys.version_info[1])")
if [[ python_major -lt 3 || ( python_major -eq 3 && python_minor -lt 9 ) ]] ; then
echo "selftests: [SKIP] Could not run test without at least python3.9"
python3 -V
exit 4
fi
}
LOG_DIR="$current_dir"/rds_logs
PLOSS=0
PCORRUPT=0
PDUP=0
GENERATE_GCOV_REPORT=1
while getopts "d:l:c:u:" opt; do
case ${opt} in
d)
LOG_DIR=${OPTARG}
;;
l)
PLOSS=${OPTARG}
;;
c)
PCORRUPT=${OPTARG}
;;
u)
PDUP=${OPTARG}
;;
:)
echo "USAGE: run.sh [-d logdir] [-l packet_loss] [-c packet_corruption]" \
"[-u packet_duplcate] [-g]"
exit 1
;;
?)
echo "Invalid option: -${OPTARG}."
exit 1
;;
esac
done
check_env
check_conf
check_gcov_conf
rm -fr "$LOG_DIR"
TRACE_FILE="${LOG_DIR}/rds-strace.txt"
COVR_DIR="${LOG_DIR}/coverage/"
mkdir -p "$LOG_DIR"
mkdir -p "$COVR_DIR"
set +e
echo running RDS tests...
echo Traces will be logged to "$TRACE_FILE"
rm -f "$TRACE_FILE"
strace -T -tt -o "$TRACE_FILE" python3 "$(dirname "$0")/test.py" --timeout 400 -d "$LOG_DIR" \
-l "$PLOSS" -c "$PCORRUPT" -u "$PDUP"
test_rc=$?
dmesg > "${LOG_DIR}/dmesg.out"
if [ "$GENERATE_GCOV_REPORT" -eq 1 ]; then
echo saving coverage data...
(set +x; cd /sys/kernel/debug/gcov; find ./* -name '*.gcda' | \
while read -r f
do
cat < "/sys/kernel/debug/gcov/$f" > "/$f"
done)
echo running gcovr...
gcovr -s --html-details --gcov-executable "$GCOV_CMD" --gcov-ignore-parse-errors \
-o "${COVR_DIR}/gcovr" "${ksrc_dir}/net/rds/"
else
echo "Coverage report will be skipped"
fi
if [ "$test_rc" -eq 0 ]; then
echo "PASS: Test completed successfully"
else
echo "FAIL: Test failed"
fi
exit "$test_rc"

262
tools/testing/selftests/net/rds/test.py Normal file
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@ -0,0 +1,262 @@
#! /usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
import argparse
import ctypes
import errno
import hashlib
import os
import select
import signal
import socket
import subprocess
import sys
import atexit
from pwd import getpwuid
from os import stat
from lib.py import ip
libc = ctypes.cdll.LoadLibrary('libc.so.6')
setns = libc.setns
net0 = 'net0'
net1 = 'net1'
veth0 = 'veth0'
veth1 = 'veth1'
# Helper function for creating a socket inside a network namespace.
# We need this because otherwise RDS will detect that the two TCP
# sockets are on the same interface and use the loop transport instead
# of the TCP transport.
def netns_socket(netns, *args):
u0, u1 = socket.socketpair(socket.AF_UNIX, socket.SOCK_SEQPACKET)
child = os.fork()
if child == 0:
# change network namespace
with open(f'/var/run/netns/{netns}') as f:
try:
ret = setns(f.fileno(), 0)
except IOError as e:
print(e.errno)
print(e)
# create socket in target namespace
s = socket.socket(*args)
# send resulting socket to parent
socket.send_fds(u0, [], [s.fileno()])
sys.exit(0)
# receive socket from child
_, s, _, _ = socket.recv_fds(u1, 0, 1)
os.waitpid(child, 0)
u0.close()
u1.close()
return socket.fromfd(s[0], *args)
def signal_handler(sig, frame):
print('Test timed out')
sys.exit(1)
#Parse out command line arguments. We take an optional
# timeout parameter and an optional log output folder
parser = argparse.ArgumentParser(description="init script args",
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument("-d", "--logdir", action="store",
help="directory to store logs", default="/tmp")
parser.add_argument('--timeout', help="timeout to terminate hung test",
type=int, default=0)
parser.add_argument('-l', '--loss', help="Simulate tcp packet loss",
type=int, default=0)
parser.add_argument('-c', '--corruption', help="Simulate tcp packet corruption",
type=int, default=0)
parser.add_argument('-u', '--duplicate', help="Simulate tcp packet duplication",
type=int, default=0)
args = parser.parse_args()
logdir=args.logdir
packet_loss=str(args.loss)+'%'
packet_corruption=str(args.corruption)+'%'
packet_duplicate=str(args.duplicate)+'%'
ip(f"netns add {net0}")
ip(f"netns add {net1}")
ip(f"link add type veth")
addrs = [
# we technically don't need different port numbers, but this will
# help identify traffic in the network analyzer
('10.0.0.1', 10000),
('10.0.0.2', 20000),
]
# move interfaces to separate namespaces so they can no longer be
# bound directly; this prevents rds from switching over from the tcp
# transport to the loop transport.
ip(f"link set {veth0} netns {net0} up")
ip(f"link set {veth1} netns {net1} up")
# add addresses
ip(f"-n {net0} addr add {addrs[0][0]}/32 dev {veth0}")
ip(f"-n {net1} addr add {addrs[1][0]}/32 dev {veth1}")
# add routes
ip(f"-n {net0} route add {addrs[1][0]}/32 dev {veth0}")
ip(f"-n {net1} route add {addrs[0][0]}/32 dev {veth1}")
# sanity check that our two interfaces/addresses are correctly set up
# and communicating by doing a single ping
ip(f"netns exec {net0} ping -c 1 {addrs[1][0]}")
# Start a packet capture on each network
for net in [net0, net1]:
tcpdump_pid = os.fork()
if tcpdump_pid == 0:
pcap = logdir+'/'+net+'.pcap'
subprocess.check_call(['touch', pcap])
user = getpwuid(stat(pcap).st_uid).pw_name
ip(f"netns exec {net} /usr/sbin/tcpdump -Z {user} -i any -w {pcap}")
sys.exit(0)
# simulate packet loss, duplication and corruption
for net, iface in [(net0, veth0), (net1, veth1)]:
ip(f"netns exec {net} /usr/sbin/tc qdisc add dev {iface} root netem \
corrupt {packet_corruption} loss {packet_loss} duplicate \
{packet_duplicate}")
# add a timeout
if args.timeout > 0:
signal.alarm(args.timeout)
signal.signal(signal.SIGALRM, signal_handler)
sockets = [
netns_socket(net0, socket.AF_RDS, socket.SOCK_SEQPACKET),
netns_socket(net1, socket.AF_RDS, socket.SOCK_SEQPACKET),
]
for s, addr in zip(sockets, addrs):
s.bind(addr)
s.setblocking(0)
fileno_to_socket = {
s.fileno(): s for s in sockets
}
addr_to_socket = {
addr: s for addr, s in zip(addrs, sockets)
}
socket_to_addr = {
s: addr for addr, s in zip(addrs, sockets)
}
send_hashes = {}
recv_hashes = {}
ep = select.epoll()
for s in sockets:
ep.register(s, select.EPOLLRDNORM)
n = 50000
nr_send = 0
nr_recv = 0
while nr_send < n:
# Send as much as we can without blocking
print("sending...", nr_send, nr_recv)
while nr_send < n:
send_data = hashlib.sha256(
f'packet {nr_send}'.encode('utf-8')).hexdigest().encode('utf-8')
# pseudo-random send/receive pattern
sender = sockets[nr_send % 2]
receiver = sockets[1 - (nr_send % 3) % 2]
try:
sender.sendto(send_data, socket_to_addr[receiver])
send_hashes.setdefault((sender.fileno(), receiver.fileno()),
hashlib.sha256()).update(f'<{send_data}>'.encode('utf-8'))
nr_send = nr_send + 1
except BlockingIOError as e:
break
except OSError as e:
if e.errno in [errno.ENOBUFS, errno.ECONNRESET, errno.EPIPE]:
break
raise
# Receive as much as we can without blocking
print("receiving...", nr_send, nr_recv)
while nr_recv < nr_send:
for fileno, eventmask in ep.poll():
receiver = fileno_to_socket[fileno]
if eventmask & select.EPOLLRDNORM:
while True:
try:
recv_data, address = receiver.recvfrom(1024)
sender = addr_to_socket[address]
recv_hashes.setdefault((sender.fileno(),
receiver.fileno()), hashlib.sha256()).update(
f'<{recv_data}>'.encode('utf-8'))
nr_recv = nr_recv + 1
except BlockingIOError as e:
break
# exercise net/rds/tcp.c:rds_tcp_sysctl_reset()
for net in [net0, net1]:
ip(f"netns exec {net} /usr/sbin/sysctl net.rds.tcp.rds_tcp_rcvbuf=10000")
ip(f"netns exec {net} /usr/sbin/sysctl net.rds.tcp.rds_tcp_sndbuf=10000")
print("done", nr_send, nr_recv)
# the Python socket module doesn't know these
RDS_INFO_FIRST = 10000
RDS_INFO_LAST = 10017
nr_success = 0
nr_error = 0
for s in sockets:
for optname in range(RDS_INFO_FIRST, RDS_INFO_LAST + 1):
# Sigh, the Python socket module doesn't allow us to pass
# buffer lengths greater than 1024 for some reason. RDS
# wants multiple pages.
try:
s.getsockopt(socket.SOL_RDS, optname, 1024)
nr_success = nr_success + 1
except OSError as e:
nr_error = nr_error + 1
if e.errno == errno.ENOSPC:
# ignore
pass
print(f"getsockopt(): {nr_success}/{nr_error}")
print("Stopping network packet captures")
subprocess.check_call(['killall', '-q', 'tcpdump'])
# We're done sending and receiving stuff, now let's check if what
# we received is what we sent.
for (sender, receiver), send_hash in send_hashes.items():
recv_hash = recv_hashes.get((sender, receiver))
if recv_hash is None:
print("FAIL: No data received")
sys.exit(1)
if send_hash.hexdigest() != recv_hash.hexdigest():
print("FAIL: Send/recv mismatch")
print("hash expected:", send_hash.hexdigest())
print("hash received:", recv_hash.hexdigest())
sys.exit(1)
print(f"{sender}/{receiver}: ok")
print("Success")
sys.exit(0)