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mirror of https://github.com/openvswitch/ovs synced 2025-08-29 05:18:13 +00:00

ofproto-dpif-xlate: Translate timeout policy in ct action

This patch derives the timeout policy based on ct zone from the
internal data structure that we maintain on dpif layer.

It also adds a system traffic test to verify the zone-based conntrack
timeout feature.  The test uses ovs-vsctl commands to configure
the customized ICMP and UDP timeout on zone 5 to a shorter period.
It then injects ICMP and UDP traffic to conntrack, and checks if the
corresponding conntrack entry expires after the predefined timeout.

Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com>

ofproto-dpif: Checks if datapath supports OVS_CT_ATTR_TIMEOUT

This patch checks whether datapath supports OVS_CT_ATTR_TIMEOUT. With this
check, ofproto-dpif-xlate can use this information to decide whether to
translate the ct timeout policy.

Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com>
Signed-off-by: Justin Pettit <jpettit@ovn.org>
This commit is contained in:
Yi-Hung Wei 2019-08-28 15:14:29 -07:00 committed by Justin Pettit
parent ebe62ec1b9
commit 187bb41fbf
12 changed files with 308 additions and 22 deletions

1
NEWS
View File

@ -78,6 +78,7 @@ v2.12.0 - 03 Sep 2019
- Linux datapath:
* Support for the kernel versions 4.19.x and 4.20.x.
* Support for the kernel version 5.0.x.
* Add support for conntrack zone-based timeout policy.
- 'ovs-dpctl dump-flows' is no longer suitable for dumping offloaded flows.
'ovs-appctl dpctl/dump-flows' should be used instead.
- Add L2 GRE tunnel over IPv6 support.

View File

@ -878,3 +878,14 @@ ct_dpif_timeout_policy_dump_done(struct dpif *dpif, void *state)
? dpif->dpif_class->ct_timeout_policy_dump_done(dpif, state)
: EOPNOTSUPP);
}
int
ct_dpif_get_timeout_policy_name(struct dpif *dpif, uint32_t tp_id,
uint16_t dl_type, uint8_t nw_proto,
char **tp_name, bool *is_generic)
{
return (dpif->dpif_class->ct_get_timeout_policy_name
? dpif->dpif_class->ct_get_timeout_policy_name(
dpif, tp_id, dl_type, nw_proto, tp_name, is_generic)
: EOPNOTSUPP);
}

View File

@ -320,5 +320,8 @@ int ct_dpif_timeout_policy_dump_start(struct dpif *dpif, void **statep);
int ct_dpif_timeout_policy_dump_next(struct dpif *dpif, void *state,
struct ct_dpif_timeout_policy *tp);
int ct_dpif_timeout_policy_dump_done(struct dpif *dpif, void *state);
int ct_dpif_get_timeout_policy_name(struct dpif *dpif, uint32_t tp_id,
uint16_t dl_type, uint8_t nw_proto,
char **tp_name, bool *is_generic);
#endif /* CT_DPIF_H */

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@ -7576,6 +7576,7 @@ const struct dpif_class dpif_netdev_class = {
NULL, /* ct_timeout_policy_dump_start */
NULL, /* ct_timeout_policy_dump_next */
NULL, /* ct_timeout_policy_dump_done */
NULL, /* ct_get_timeout_policy_name */
dpif_netdev_ipf_set_enabled,
dpif_netdev_ipf_set_min_frag,
dpif_netdev_ipf_set_max_nfrags,

View File

@ -3056,19 +3056,34 @@ static struct dpif_netlink_timeout_policy_protocol tp_protos[] = {
static void
dpif_netlink_format_tp_name(uint32_t id, uint16_t l3num, uint8_t l4num,
struct ds *tp_name)
char **tp_name)
{
ds_clear(tp_name);
ds_put_format(tp_name, "%s%"PRIu32"_", NL_TP_NAME_PREFIX, id);
ct_dpif_format_ipproto(tp_name, l4num);
struct ds ds = DS_EMPTY_INITIALIZER;
ds_put_format(&ds, "%s%"PRIu32"_", NL_TP_NAME_PREFIX, id);
ct_dpif_format_ipproto(&ds, l4num);
if (l3num == AF_INET) {
ds_put_cstr(tp_name, "4");
ds_put_cstr(&ds, "4");
} else if (l3num == AF_INET6 && l4num != IPPROTO_ICMPV6) {
ds_put_cstr(tp_name, "6");
ds_put_cstr(&ds, "6");
}
ovs_assert(tp_name->length < CTNL_TIMEOUT_NAME_MAX);
ovs_assert(ds.length < CTNL_TIMEOUT_NAME_MAX);
*tp_name = ds_steal_cstr(&ds);
}
static int
dpif_netlink_ct_get_timeout_policy_name(struct dpif *dpif OVS_UNUSED,
uint32_t tp_id, uint16_t dl_type,
uint8_t nw_proto, char **tp_name,
bool *is_generic)
{
dpif_netlink_format_tp_name(tp_id,
dl_type == ETH_TYPE_IP ? AF_INET : AF_INET6,
nw_proto, tp_name);
*is_generic = false;
return 0;
}
#define CT_DPIF_NL_TP_TCP_MAPPINGS \
@ -3264,14 +3279,17 @@ static int
dpif_netlink_ct_set_timeout_policy(struct dpif *dpif OVS_UNUSED,
const struct ct_dpif_timeout_policy *tp)
{
struct nl_ct_timeout_policy nl_tp;
struct ds nl_tp_name = DS_EMPTY_INITIALIZER;
int err = 0;
for (int i = 0; i < ARRAY_SIZE(tp_protos); ++i) {
struct nl_ct_timeout_policy nl_tp;
char *nl_tp_name;
dpif_netlink_format_tp_name(tp->id, tp_protos[i].l3num,
tp_protos[i].l4num, &nl_tp_name);
ovs_strlcpy(nl_tp.name, ds_cstr(&nl_tp_name), sizeof nl_tp.name);
ovs_strlcpy(nl_tp.name, nl_tp_name, sizeof nl_tp.name);
free(nl_tp_name);
nl_tp.l3num = tp_protos[i].l3num;
nl_tp.l4num = tp_protos[i].l4num;
dpif_netlink_get_nl_tp_attrs(tp, tp_protos[i].l4num, &nl_tp);
@ -3284,7 +3302,6 @@ dpif_netlink_ct_set_timeout_policy(struct dpif *dpif OVS_UNUSED,
}
out:
ds_destroy(&nl_tp_name);
return err;
}
@ -3293,27 +3310,29 @@ dpif_netlink_ct_get_timeout_policy(struct dpif *dpif OVS_UNUSED,
uint32_t tp_id,
struct ct_dpif_timeout_policy *tp)
{
struct nl_ct_timeout_policy nl_tp;
struct ds nl_tp_name = DS_EMPTY_INITIALIZER;
int err = 0;
tp->id = tp_id;
tp->present = 0;
for (int i = 0; i < ARRAY_SIZE(tp_protos); ++i) {
struct nl_ct_timeout_policy nl_tp;
char *nl_tp_name;
dpif_netlink_format_tp_name(tp_id, tp_protos[i].l3num,
tp_protos[i].l4num, &nl_tp_name);
err = nl_ct_get_timeout_policy(ds_cstr(&nl_tp_name), &nl_tp);
err = nl_ct_get_timeout_policy(nl_tp_name, &nl_tp);
if (err) {
VLOG_WARN_RL(&error_rl, "failed to get timeout policy %s (%s)",
nl_tp.name, ovs_strerror(err));
nl_tp_name, ovs_strerror(err));
free(nl_tp_name);
goto out;
}
free(nl_tp_name);
dpif_netlink_set_ct_dpif_tp_attrs(&nl_tp, tp);
}
out:
ds_destroy(&nl_tp_name);
return err;
}
@ -3323,25 +3342,25 @@ static int
dpif_netlink_ct_del_timeout_policy(struct dpif *dpif OVS_UNUSED,
uint32_t tp_id)
{
struct ds nl_tp_name = DS_EMPTY_INITIALIZER;
int ret = 0;
for (int i = 0; i < ARRAY_SIZE(tp_protos); ++i) {
char *nl_tp_name;
dpif_netlink_format_tp_name(tp_id, tp_protos[i].l3num,
tp_protos[i].l4num, &nl_tp_name);
int err = nl_ct_del_timeout_policy(ds_cstr(&nl_tp_name));
int err = nl_ct_del_timeout_policy(nl_tp_name);
if (err == ENOENT) {
err = 0;
}
if (err) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(6, 6);
VLOG_INFO_RL(&rl, "failed to delete timeout policy %s (%s)",
ds_cstr(&nl_tp_name), ovs_strerror(err));
nl_tp_name, ovs_strerror(err));
ret = 1;
}
free(nl_tp_name);
}
ds_destroy(&nl_tp_name);
return ret;
}
@ -3907,6 +3926,7 @@ const struct dpif_class dpif_netlink_class = {
dpif_netlink_ct_timeout_policy_dump_start,
dpif_netlink_ct_timeout_policy_dump_next,
dpif_netlink_ct_timeout_policy_dump_done,
dpif_netlink_ct_get_timeout_policy_name,
NULL, /* ipf_set_enabled */
NULL, /* ipf_set_min_frag */
NULL, /* ipf_set_max_nfrags */

View File

@ -547,6 +547,19 @@ struct dpif_class {
struct ct_dpif_timeout_policy *tp);
int (*ct_timeout_policy_dump_done)(struct dpif *, void *state);
/* Gets timeout policy based on 'tp_id', 'dl_type' and 'nw_proto'.
* On success, returns 0, stores the timeout policy name in 'tp_name',
* and sets 'is_generic'. 'is_generic' is false if the returned timeout
* policy in the 'dpif' is specific to 'dl_type' and 'nw_proto' in the
* datapath (e.g., the Linux kernel datapath). Sets 'is_generic' to
* true, if the timeout policy supports all OVS supported L3/L4
* protocols.
*
* The caller is responsible for freeing 'tp_name'. */
int (*ct_get_timeout_policy_name)(struct dpif *, uint32_t tp_id,
uint16_t dl_type, uint8_t nw_proto,
char **tp_name, bool *is_generic);
/* IP Fragmentation. */
/* Disables or enables conntrack fragment reassembly. The default

View File

@ -6016,6 +6016,29 @@ put_ct_helper(struct xlate_ctx *ctx,
}
}
static void
put_ct_timeout(struct ofpbuf *odp_actions, const struct dpif_backer *backer,
const struct flow *flow, struct flow_wildcards *wc,
uint16_t zone_id)
{
bool unwildcard;
char *tp_name = NULL;
if (ofproto_dpif_ct_zone_timeout_policy_get_name(backer, zone_id,
ntohs(flow->dl_type), flow->nw_proto, &tp_name, &unwildcard)) {
nl_msg_put_string(odp_actions, OVS_CT_ATTR_TIMEOUT, tp_name);
if (unwildcard) {
/* The underlying datapath requires separate timeout
* policies for different Ethertypes and IP protocols. We
* don't need to unwildcard 'wc->masks.dl_type' since that
* field is always unwildcarded in megaflows. */
memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
}
}
free(tp_name);
}
static void
put_ct_nat(struct xlate_ctx *ctx)
{
@ -6106,6 +6129,10 @@ compose_conntrack_action(struct xlate_ctx *ctx, struct ofpact_conntrack *ofc,
nl_msg_put_u32(ctx->odp_actions, OVS_CT_ATTR_EVENTMASK,
OVS_CT_EVENTMASK_DEFAULT);
}
if (ctx->xbridge->support.ct_timeout) {
put_ct_timeout(ctx->odp_actions, ctx->xbridge->ofproto->backer,
&ctx->xin->flow, ctx->wc, zone);
}
}
nl_msg_put_u16(ctx->odp_actions, OVS_CT_ATTR_ZONE, zone);
put_ct_mark(&ctx->xin->flow, ctx->odp_actions, ctx->wc);

View File

@ -1323,6 +1323,67 @@ check_ct_clear(struct dpif_backer *backer)
return supported;
}
/* Tests whether 'backer''s datapath supports the OVS_CT_ATTR_TIMEOUT
* attribute in OVS_ACTION_ATTR_CT. */
static bool
check_ct_timeout_policy(struct dpif_backer *backer)
{
struct dpif_execute execute;
struct dp_packet packet;
struct ofpbuf actions;
struct flow flow = {
.dl_type = CONSTANT_HTONS(ETH_TYPE_IP),
.nw_proto = IPPROTO_UDP,
.nw_ttl = 64,
/* Use the broadcast address on the loopback address range 127/8 to
* avoid hitting any real conntrack entries. We leave the UDP ports to
* zeroes for the same purpose. */
.nw_src = CONSTANT_HTONL(0x7fffffff),
.nw_dst = CONSTANT_HTONL(0x7fffffff),
};
size_t ct_start;
int error;
/* Compose CT action with timeout policy attribute and check if datapath
* can decode the message. */
ofpbuf_init(&actions, 64);
ct_start = nl_msg_start_nested(&actions, OVS_ACTION_ATTR_CT);
/* Timeout policy has no effect without the commit flag, but currently the
* datapath will accept a timeout policy even without commit. This is
* useful as we do not want to persist the probe connection in the
* conntrack table. */
nl_msg_put_string(&actions, OVS_CT_ATTR_TIMEOUT, "ovs_test_tp");
nl_msg_end_nested(&actions, ct_start);
/* Compose a dummy UDP packet. */
dp_packet_init(&packet, 0);
flow_compose(&packet, &flow, NULL, 64);
/* Execute the actions. On older datapaths this fails with EINVAL, on
* newer datapaths it succeeds. */
execute.actions = actions.data;
execute.actions_len = actions.size;
execute.packet = &packet;
execute.flow = &flow;
execute.needs_help = false;
execute.probe = true;
execute.mtu = 0;
error = dpif_execute(backer->dpif, &execute);
dp_packet_uninit(&packet);
ofpbuf_uninit(&actions);
if (error) {
VLOG_INFO("%s: Datapath does not support timeout policy in conntrack "
"action", dpif_name(backer->dpif));
} else {
VLOG_INFO("%s: Datapath supports timeout policy in conntrack action",
dpif_name(backer->dpif));
}
return !error;
}
/* Tests whether 'backer''s datapath supports the
* OVS_ACTION_ATTR_CHECK_PKT_LEN action. */
@ -1473,6 +1534,7 @@ check_support(struct dpif_backer *backer)
backer->rt_support.ct_clear = check_ct_clear(backer);
backer->rt_support.max_hash_alg = check_max_dp_hash_alg(backer);
backer->rt_support.check_pkt_len = check_check_pkt_len(backer);
backer->rt_support.ct_timeout = check_ct_timeout_policy(backer);
/* Flow fields. */
backer->rt_support.odp.ct_state = check_ct_state(backer);
@ -5378,6 +5440,41 @@ ct_del_zone_timeout_policy(const char *datapath_type, uint16_t zone_id)
}
}
/* Gets timeout policy name in 'backer' based on 'zone', 'dl_type' and
* 'nw_proto'. Returns true if the zone-based timeout policy is configured.
* On success, stores the timeout policy name in 'tp_name', and sets
* 'unwildcard' based on the dpif implementation. If 'unwildcard' is true,
* the returned timeout policy is 'dl_type' and 'nw_proto' specific, and OVS
* needs to unwildcard the datapath flow for this timeout policy in flow
* translation.
*
* The caller is responsible for freeing 'tp_name'. */
bool
ofproto_dpif_ct_zone_timeout_policy_get_name(
const struct dpif_backer *backer, uint16_t zone, uint16_t dl_type,
uint8_t nw_proto, char **tp_name, bool *unwildcard)
{
if (!ct_dpif_timeout_policy_support_ipproto(nw_proto)) {
return false;
}
struct ct_zone *ct_zone = ct_zone_lookup(&backer->ct_zones, zone);
if (!ct_zone) {
return false;
}
bool is_generic;
if (ct_dpif_get_timeout_policy_name(backer->dpif,
ct_zone->ct_tp->tp_id, dl_type,
nw_proto, tp_name, &is_generic)) {
return false;
}
/* Unwildcard datapath flow if it is not a generic timeout policy. */
*unwildcard = !is_generic;
return true;
}
static bool
set_frag_handling(struct ofproto *ofproto_,
enum ofputil_frag_handling frag_handling)

View File

@ -194,8 +194,12 @@ struct group_dpif *group_dpif_lookup(struct ofproto_dpif *,
/* Highest supported dp_hash algorithm. */ \
DPIF_SUPPORT_FIELD(size_t, max_hash_alg, "Max dp_hash algorithm") \
\
/* True if the datapath supports OVS_ACTION_ATTR_CHECK_PKT_LEN. */ \
DPIF_SUPPORT_FIELD(bool, check_pkt_len, "Check pkt length action")
/* True if the datapath supports OVS_ACTION_ATTR_CHECK_PKT_LEN. */ \
DPIF_SUPPORT_FIELD(bool, check_pkt_len, "Check pkt length action") \
\
/* True if the datapath supports OVS_CT_ATTR_TIMEOUT in \
* OVS_ACTION_ATTR_CT action. */ \
DPIF_SUPPORT_FIELD(bool, ct_timeout, "Conntrack timeout policy")
/* Stores the various features which the corresponding backer supports. */
struct dpif_backer_support {
@ -374,4 +378,8 @@ int ofproto_dpif_delete_internal_flow(struct ofproto_dpif *, struct match *,
bool ovs_native_tunneling_is_on(struct ofproto_dpif *);
bool ofproto_dpif_ct_zone_timeout_policy_get_name(
const struct dpif_backer *backer, uint16_t zone, uint16_t dl_type,
uint8_t nw_proto, char **tp_name, bool *unwildcard);
#endif /* ofproto-dpif.h */

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@ -100,6 +100,17 @@ m4_define([CHECK_CONNTRACK_FRAG_OVERLAP],
#
m4_define([CHECK_CONNTRACK_NAT])
# CHECK_CONNTRACK_TIMEOUT()
#
# Perform requirements checks for running conntrack customized timeout tests.
#
m4_define([CHECK_CONNTRACK_TIMEOUT],
[
AT_SKIP_IF([! cat /boot/config-$(uname -r) | grep NF_CONNTRACK_TIMEOUT | grep '=y' > /dev/null])
modprobe nfnetlink_cttimeout
on_exit 'modprobe -r nfnetlink_cttimeout'
])
# CHECK_CT_DPIF_PER_ZONE_LIMIT()
#
# Perform requirements checks for running ovs-dpctl ct-[set|get|del]-limits per
@ -185,3 +196,12 @@ m4_define([OVS_CHECK_KERNEL_EXCL],
sublevel=$(uname -r | sed -e 's/\./ /g' | awk '{print $ 2}')
AT_SKIP_IF([ ! ( test $version -lt $1 || ( test $version -eq $1 && test $sublevel -lt $2 ) || test $version -gt $3 || ( test $version -eq $3 && test $sublevel -gt $4 ) ) ])
])
# VSCTL_ADD_DATAPATH_TABLE()
#
# Create system datapath table "system" for kernel tests in ovsdb
m4_define([VSCTL_ADD_DATAPATH_TABLE],
[
AT_CHECK([ovs-vsctl -- --id=@m create Datapath datapath_version=0 -- set Open_vSwitch . datapaths:"system"=@m], [0], [stdout])
DP_TYPE=$(echo "system")
])

View File

@ -3179,6 +3179,72 @@ NXST_FLOW reply:
OVS_TRAFFIC_VSWITCHD_STOP
AT_CLEANUP
AT_SETUP([conntrack - zone-based timeout policy])
CHECK_CONNTRACK()
CHECK_CONNTRACK_TIMEOUT()
OVS_TRAFFIC_VSWITCHD_START()
ADD_NAMESPACES(at_ns0, at_ns1)
ADD_VETH(p0, at_ns0, br0, "10.1.1.1/24")
ADD_VETH(p1, at_ns1, br0, "10.1.1.2/24")
AT_DATA([flows.txt], [dnl
priority=1,action=drop
priority=10,arp,action=normal
priority=100,in_port=1,ip,action=ct(zone=5, table=1)
priority=100,in_port=2,ip,action=ct(zone=5, table=1)
table=1,in_port=2,ip,ct_state=+trk+est,action=1
table=1,in_port=1,ip,ct_state=+trk+new,action=ct(commit,zone=5),2
table=1,in_port=1,ip,ct_state=+trk+est,action=2
])
AT_CHECK([ovs-ofctl --bundle add-flows br0 flows.txt])
dnl Test with default timeout
dnl The default udp_single and icmp_first timeouts are 30 seconds in
dnl kernel DP, and 60 seconds in userspace DP.
dnl Send ICMP and UDP traffic
NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 10.1.1.2 | FORMAT_PING], [0], [dnl
3 packets transmitted, 3 received, 0% packet loss, time 0ms
])
AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101010a0101020001000200080000 actions=resubmit(,0)"])
sleep 4
AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT(10.1.1.2) | sort], [0], [dnl
icmp,orig=(src=10.1.1.1,dst=10.1.1.2,id=<cleared>,type=8,code=0),reply=(src=10.1.1.2,dst=10.1.1.1,id=<cleared>,type=0,code=0),zone=5
udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=<cleared>,dport=<cleared>),reply=(src=10.1.1.2,dst=10.1.1.1,sport=<cleared>,dport=<cleared>),zone=5
])
AT_CHECK([ovs-appctl dpctl/flush-conntrack])
dnl Shorten the udp_single and icmp_first timeout in zone 5
VSCTL_ADD_DATAPATH_TABLE()
AT_CHECK([ovs-vsctl add-zone-tp $DP_TYPE zone=5 udp_single=3 icmp_first=3])
dnl Send ICMP and UDP traffic
NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 10.1.1.2 | FORMAT_PING], [0], [dnl
3 packets transmitted, 3 received, 0% packet loss, time 0ms
])
AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101010a0101020001000200080000 actions=resubmit(,0)"])
AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT(10.1.1.2) | sort], [0], [dnl
icmp,orig=(src=10.1.1.1,dst=10.1.1.2,id=<cleared>,type=8,code=0),reply=(src=10.1.1.2,dst=10.1.1.1,id=<cleared>,type=0,code=0),zone=5
udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=<cleared>,dport=<cleared>),reply=(src=10.1.1.2,dst=10.1.1.1,sport=<cleared>,dport=<cleared>),zone=5
])
dnl Wait until the timeout expire.
dnl We intend to wait a bit longer, because conntrack does not recycle the entry right after it is expired.
sleep 4
AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT(10.1.1.2)], [0], [dnl
])
OVS_TRAFFIC_VSWITCHD_STOP
AT_CLEANUP
AT_BANNER([conntrack - L7])
AT_SETUP([conntrack - IPv4 HTTP])

View File

@ -98,6 +98,16 @@ m4_define([CHECK_CONNTRACK_FRAG_OVERLAP])
#
m4_define([CHECK_CONNTRACK_NAT])
# CHECK_CONNTRACK_TIMEOUT()
#
# Perform requirements checks for running conntrack customized timeout tests.
* The userspace datapath does not support this feature yet.
#
m4_define([CHECK_CONNTRACK_TIMEOUT],
[
AT_SKIP_IF([:])
])
# CHECK_CT_DPIF_PER_ZONE_LIMIT()
#
# Perform requirements checks for running ovs-dpctl ct-[set|get|del]-limits per
@ -295,3 +305,12 @@ m4_define([OVS_CHECK_KERNEL_EXCL],
[
AT_SKIP_IF([:])
])
# VSCTL_ADD_DATAPATH_TABLE()
#
# Create datapath table "netdev" for userspace tests in ovsdb
m4_define([VSCTL_ADD_DATAPATH_TABLE],
[
AT_CHECK([ovs-vsctl -- --id=@m create Datapath datapath_version=0 -- set Open_vSwitch . datapaths:"netdev"=@m], [0], [stdout])
DP_TYPE=$(echo "netdev")
])