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selftests: openvswitch: add psample test
Add a test to verify sampling packets via psample works. In order to do that, create a subcommand in ovs-dpctl.py to listen to on the psample multicast group and print samples. Reviewed-by: Aaron Conole <aconole@redhat.com> Tested-by: Ilya Maximets <i.maximets@ovn.org> Signed-off-by: Adrian Moreno <amorenoz@redhat.com> Link: https://patch.msgid.link/20240704085710.353845-11-amorenoz@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Adrian Moreno
Jakub Kicinski
parent
b192bf12db
commit
30d772a035
@ -20,7 +20,8 @@ tests="
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nat_related_v4 ip4-nat-related: ICMP related matches work with SNAT
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netlink_checks ovsnl: validate netlink attrs and settings
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upcall_interfaces ovs: test the upcall interfaces
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drop_reason drop: test drop reasons are emitted"
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drop_reason drop: test drop reasons are emitted
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psample psample: Sampling packets with psample"
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info() {
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[ "${ovs_dir}" != "" ] &&
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@ -105,12 +106,21 @@ ovs_netns_spawn_daemon() {
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shift
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netns=$1
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shift
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info "spawning cmd: $*"
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ip netns exec $netns $* >> $ovs_dir/stdout 2>> $ovs_dir/stderr &
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if [ "$netns" == "_default" ]; then
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$* >> $ovs_dir/stdout 2>> $ovs_dir/stderr &
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else
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ip netns exec $netns $* >> $ovs_dir/stdout 2>> $ovs_dir/stderr &
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fi
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pid=$!
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ovs_sbx "$sbx" on_exit "kill -TERM $pid 2>/dev/null"
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}
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ovs_spawn_daemon() {
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sbx=$1
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shift
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ovs_netns_spawn_daemon $sbx "_default" $*
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}
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ovs_add_netns_and_veths () {
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info "Adding netns attached: sbx:$1 dp:$2 {$3, $4, $5}"
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ovs_sbx "$1" ip netns add "$3" || return 1
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@ -173,6 +183,19 @@ ovs_drop_reason_count()
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return `echo "$perf_output" | grep "$pattern" | wc -l`
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}
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ovs_test_flow_fails () {
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ERR_MSG="Flow actions may not be safe on all matching packets"
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PRE_TEST=$(dmesg | grep -c "${ERR_MSG}")
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ovs_add_flow $@ &> /dev/null $@ && return 1
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POST_TEST=$(dmesg | grep -c "${ERR_MSG}")
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if [ "$PRE_TEST" == "$POST_TEST" ]; then
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return 1
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fi
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return 0
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}
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usage() {
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echo
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echo "$0 [OPTIONS] [TEST]..."
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@ -187,6 +210,92 @@ usage() {
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exit 1
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}
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# psample test
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# - use psample to observe packets
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test_psample() {
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sbx_add "test_psample" || return $?
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# Add a datapath with per-vport dispatching.
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ovs_add_dp "test_psample" psample -V 2:1 || return 1
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info "create namespaces"
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ovs_add_netns_and_veths "test_psample" "psample" \
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client c0 c1 172.31.110.10/24 -u || return 1
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ovs_add_netns_and_veths "test_psample" "psample" \
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server s0 s1 172.31.110.20/24 -u || return 1
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# Check if psample actions can be configured.
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ovs_add_flow "test_psample" psample \
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'in_port(1),eth(),eth_type(0x0806),arp()' 'psample(group=1)' &> /dev/null
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if [ $? == 1 ]; then
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info "no support for psample - skipping"
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ovs_exit_sig
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return $ksft_skip
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fi
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ovs_del_flows "test_psample" psample
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# Test action verification.
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OLDIFS=$IFS
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IFS='*'
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min_key='in_port(1),eth(),eth_type(0x0800),ipv4()'
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for testcase in \
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"cookie to large"*"psample(group=1,cookie=1615141312111009080706050403020100)" \
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"no group with cookie"*"psample(cookie=abcd)" \
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"no group"*"psample()";
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do
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set -- $testcase;
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ovs_test_flow_fails "test_psample" psample $min_key $2
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if [ $? == 1 ]; then
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info "failed - $1"
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return 1
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fi
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done
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IFS=$OLDIFS
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ovs_del_flows "test_psample" psample
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# Allow ARP
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ovs_add_flow "test_psample" psample \
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'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1
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ovs_add_flow "test_psample" psample \
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'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1
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# Sample first 14 bytes of all traffic.
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ovs_add_flow "test_psample" psample \
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"in_port(1),eth(),eth_type(0x0800),ipv4()" \
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"trunc(14),psample(group=1,cookie=c0ffee),2"
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# Sample all traffic. In this case, use a sample() action with both
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# psample and an upcall emulating simultaneous local sampling and
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# sFlow / IPFIX.
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nlpid=$(grep -E "listening on upcall packet handler" \
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$ovs_dir/s0.out | cut -d ":" -f 2 | tr -d ' ')
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ovs_add_flow "test_psample" psample \
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"in_port(2),eth(),eth_type(0x0800),ipv4()" \
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"sample(sample=100%,actions(psample(group=2,cookie=eeff0c),userspace(pid=${nlpid},userdata=eeff0c))),1"
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# Record psample data.
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ovs_spawn_daemon "test_psample" python3 $ovs_base/ovs-dpctl.py psample-events
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# Send a single ping.
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sleep 1
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ovs_sbx "test_psample" ip netns exec client ping -I c1 172.31.110.20 -c 1 || return 1
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sleep 1
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# We should have received one userspace action upcall and 2 psample packets.
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grep -E "userspace action command" $ovs_dir/s0.out >/dev/null 2>&1 || return 1
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# client -> server samples should only contain the first 14 bytes of the packet.
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grep -E "rate:4294967295,group:1,cookie:c0ffee data:[0-9a-f]{28}$" \
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$ovs_dir/stdout >/dev/null 2>&1 || return 1
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grep -E "rate:4294967295,group:2,cookie:eeff0c" \
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$ovs_dir/stdout >/dev/null 2>&1 || return 1
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return 0
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}
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# drop_reason test
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# - drop packets and verify the right drop reason is reported
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test_drop_reason() {
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@ -28,8 +28,10 @@ try:
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from pyroute2.netlink import genlmsg
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from pyroute2.netlink import nla
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from pyroute2.netlink import nlmsg_atoms
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from pyroute2.netlink.event import EventSocket
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from pyroute2.netlink.exceptions import NetlinkError
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from pyroute2.netlink.generic import GenericNetlinkSocket
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from pyroute2.netlink.nlsocket import Marshal
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import pyroute2
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import pyroute2.iproute
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@ -2460,10 +2462,70 @@ class OvsFlow(GenericNetlinkSocket):
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print("MISS upcall[%d/%s]: %s" % (seq, pktpres, keystr), flush=True)
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def execute(self, packetmsg):
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print("userspace execute command")
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print("userspace execute command", flush=True)
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def action(self, packetmsg):
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print("userspace action command")
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print("userspace action command", flush=True)
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class psample_sample(genlmsg):
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nla_map = (
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("PSAMPLE_ATTR_IIFINDEX", "none"),
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("PSAMPLE_ATTR_OIFINDEX", "none"),
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("PSAMPLE_ATTR_ORIGSIZE", "none"),
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("PSAMPLE_ATTR_SAMPLE_GROUP", "uint32"),
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("PSAMPLE_ATTR_GROUP_SEQ", "none"),
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("PSAMPLE_ATTR_SAMPLE_RATE", "uint32"),
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("PSAMPLE_ATTR_DATA", "array(uint8)"),
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("PSAMPLE_ATTR_GROUP_REFCOUNT", "none"),
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("PSAMPLE_ATTR_TUNNEL", "none"),
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("PSAMPLE_ATTR_PAD", "none"),
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("PSAMPLE_ATTR_OUT_TC", "none"),
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("PSAMPLE_ATTR_OUT_TC_OCC", "none"),
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("PSAMPLE_ATTR_LATENCY", "none"),
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("PSAMPLE_ATTR_TIMESTAMP", "none"),
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("PSAMPLE_ATTR_PROTO", "none"),
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("PSAMPLE_ATTR_USER_COOKIE", "array(uint8)"),
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)
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def dpstr(self):
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fields = []
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data = ""
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for (attr, value) in self["attrs"]:
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if attr == "PSAMPLE_ATTR_SAMPLE_GROUP":
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fields.append("group:%d" % value)
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if attr == "PSAMPLE_ATTR_SAMPLE_RATE":
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fields.append("rate:%d" % value)
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if attr == "PSAMPLE_ATTR_USER_COOKIE":
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value = "".join(format(x, "02x") for x in value)
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fields.append("cookie:%s" % value)
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if attr == "PSAMPLE_ATTR_DATA" and len(value) > 0:
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data = "data:%s" % "".join(format(x, "02x") for x in value)
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return ("%s %s" % (",".join(fields), data)).strip()
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class psample_msg(Marshal):
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PSAMPLE_CMD_SAMPLE = 0
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PSAMPLE_CMD_GET_GROUP = 1
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PSAMPLE_CMD_NEW_GROUP = 2
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PSAMPLE_CMD_DEL_GROUP = 3
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PSAMPLE_CMD_SET_FILTER = 4
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msg_map = {PSAMPLE_CMD_SAMPLE: psample_sample}
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class PsampleEvent(EventSocket):
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genl_family = "psample"
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mcast_groups = ["packets"]
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marshal_class = psample_msg
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def read_samples(self):
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while True:
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try:
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for msg in self.get():
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print(msg.dpstr(), flush=True)
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except NetlinkError as ne:
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raise ne
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def print_ovsdp_full(dp_lookup_rep, ifindex, ndb=NDB(), vpl=OvsVport()):
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@ -2530,7 +2592,7 @@ def main(argv):
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help="Increment 'verbose' output counter.",
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default=0,
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)
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subparsers = parser.add_subparsers()
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subparsers = parser.add_subparsers(dest="subcommand")
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showdpcmd = subparsers.add_parser("show")
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showdpcmd.add_argument(
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@ -2605,6 +2667,8 @@ def main(argv):
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delfscmd = subparsers.add_parser("del-flows")
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delfscmd.add_argument("flsbr", help="Datapath name")
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subparsers.add_parser("psample-events")
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args = parser.parse_args()
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if args.verbose > 0:
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@ -2619,6 +2683,9 @@ def main(argv):
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sys.setrecursionlimit(100000)
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if args.subcommand == "psample-events":
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PsampleEvent().read_samples()
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if hasattr(args, "showdp"):
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found = False
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for iface in ndb.interfaces:
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