2 * Copyright (c) 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "netdev-vport.h"
23 #include <sys/socket.h>
25 #include <sys/ioctl.h>
27 #include "byte-order.h"
34 #include "netdev-provider.h"
37 #include "poll-loop.h"
38 #include "route-table.h"
40 #include "socket-util.h"
43 VLOG_DEFINE_THIS_MODULE(netdev_vport);
45 #define GENEVE_DST_PORT 6081
46 #define VXLAN_DST_PORT 4789
47 #define LISP_DST_PORT 4341
49 #define DEFAULT_TTL 64
54 /* Protects all members below. */
55 struct ovs_mutex mutex;
57 uint8_t etheraddr[ETH_ADDR_LEN];
58 struct netdev_stats stats;
61 struct netdev_tunnel_config tnl_cfg;
62 char egress_iface[IFNAMSIZ];
70 const char *dpif_port;
71 struct netdev_class netdev_class;
74 /* Last read of the route-table's change number. */
75 static uint64_t rt_change_seqno;
77 static int netdev_vport_construct(struct netdev *);
78 static int get_patch_config(const struct netdev *netdev, struct smap *args);
79 static int get_tunnel_config(const struct netdev *, struct smap *args);
80 static bool tunnel_check_status_change__(struct netdev_vport *);
83 is_vport_class(const struct netdev_class *class)
85 return class->construct == netdev_vport_construct;
89 netdev_vport_is_vport_class(const struct netdev_class *class)
91 return is_vport_class(class);
94 static const struct vport_class *
95 vport_class_cast(const struct netdev_class *class)
97 ovs_assert(is_vport_class(class));
98 return CONTAINER_OF(class, struct vport_class, netdev_class);
101 static struct netdev_vport *
102 netdev_vport_cast(const struct netdev *netdev)
104 ovs_assert(is_vport_class(netdev_get_class(netdev)));
105 return CONTAINER_OF(netdev, struct netdev_vport, up);
108 static const struct netdev_tunnel_config *
109 get_netdev_tunnel_config(const struct netdev *netdev)
111 return &netdev_vport_cast(netdev)->tnl_cfg;
115 netdev_vport_is_patch(const struct netdev *netdev)
117 const struct netdev_class *class = netdev_get_class(netdev);
119 return class->get_config == get_patch_config;
123 netdev_vport_is_layer3(const struct netdev *dev)
125 const char *type = netdev_get_type(dev);
127 return (!strcmp("lisp", type));
131 netdev_vport_needs_dst_port(const struct netdev *dev)
133 const struct netdev_class *class = netdev_get_class(dev);
134 const char *type = netdev_get_type(dev);
136 return (class->get_config == get_tunnel_config &&
137 (!strcmp("geneve", type) || !strcmp("vxlan", type) ||
138 !strcmp("lisp", type)));
142 netdev_vport_class_get_dpif_port(const struct netdev_class *class)
144 return is_vport_class(class) ? vport_class_cast(class)->dpif_port : NULL;
148 netdev_vport_get_dpif_port(const struct netdev *netdev,
149 char namebuf[], size_t bufsize)
151 const struct netdev_class *class = netdev_get_class(netdev);
152 const char *dpif_port = netdev_vport_class_get_dpif_port(class);
155 return netdev_get_name(netdev);
158 if (netdev_vport_needs_dst_port(netdev)) {
159 const struct netdev_vport *vport = netdev_vport_cast(netdev);
162 * Note: IFNAMSIZ is 16 bytes long. Implementations should choose
163 * a dpif port name that is short enough to fit including any
164 * port numbers but assert just in case.
166 BUILD_ASSERT(NETDEV_VPORT_NAME_BUFSIZE >= IFNAMSIZ);
167 ovs_assert(strlen(dpif_port) + 6 < IFNAMSIZ);
168 snprintf(namebuf, bufsize, "%s_%d", dpif_port,
169 ntohs(vport->tnl_cfg.dst_port));
177 netdev_vport_get_dpif_port_strdup(const struct netdev *netdev)
179 char namebuf[NETDEV_VPORT_NAME_BUFSIZE];
181 return xstrdup(netdev_vport_get_dpif_port(netdev, namebuf,
185 /* Whenever the route-table change number is incremented,
186 * netdev_vport_route_changed() should be called to update
187 * the corresponding tunnel interface status. */
189 netdev_vport_route_changed(void)
191 struct netdev **vports;
194 vports = netdev_get_vports(&n_vports);
195 for (i = 0; i < n_vports; i++) {
196 struct netdev *netdev_ = vports[i];
197 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
199 ovs_mutex_lock(&netdev->mutex);
200 /* Finds all tunnel vports. */
201 if (netdev->tnl_cfg.ip_dst) {
202 if (tunnel_check_status_change__(netdev)) {
203 netdev_change_seq_changed(netdev_);
206 ovs_mutex_unlock(&netdev->mutex);
208 netdev_close(netdev_);
214 static struct netdev *
215 netdev_vport_alloc(void)
217 struct netdev_vport *netdev = xzalloc(sizeof *netdev);
222 netdev_vport_construct(struct netdev *netdev_)
224 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
226 ovs_mutex_init(&netdev->mutex);
227 eth_addr_random(netdev->etheraddr);
229 route_table_register();
235 netdev_vport_destruct(struct netdev *netdev_)
237 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
239 route_table_unregister();
241 ovs_mutex_destroy(&netdev->mutex);
245 netdev_vport_dealloc(struct netdev *netdev_)
247 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
252 netdev_vport_set_etheraddr(struct netdev *netdev_,
253 const uint8_t mac[ETH_ADDR_LEN])
255 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
257 ovs_mutex_lock(&netdev->mutex);
258 memcpy(netdev->etheraddr, mac, ETH_ADDR_LEN);
259 ovs_mutex_unlock(&netdev->mutex);
260 netdev_change_seq_changed(netdev_);
266 netdev_vport_get_etheraddr(const struct netdev *netdev_,
267 uint8_t mac[ETH_ADDR_LEN])
269 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
271 ovs_mutex_lock(&netdev->mutex);
272 memcpy(mac, netdev->etheraddr, ETH_ADDR_LEN);
273 ovs_mutex_unlock(&netdev->mutex);
278 /* Checks if the tunnel status has changed and returns a boolean.
279 * Updates the tunnel status if it has changed. */
281 tunnel_check_status_change__(struct netdev_vport *netdev)
282 OVS_REQUIRES(netdev->mutex)
284 char iface[IFNAMSIZ];
289 route = netdev->tnl_cfg.ip_dst;
290 if (route_table_get_name(route, iface)) {
291 struct netdev *egress_netdev;
293 if (!netdev_open(iface, "system", &egress_netdev)) {
294 status = netdev_get_carrier(egress_netdev);
295 netdev_close(egress_netdev);
299 if (strcmp(netdev->egress_iface, iface)
300 || netdev->carrier_status != status) {
301 ovs_strlcpy(netdev->egress_iface, iface, IFNAMSIZ);
302 netdev->carrier_status = status;
311 tunnel_get_status(const struct netdev *netdev_, struct smap *smap)
313 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
315 if (netdev->egress_iface[0]) {
316 smap_add(smap, "tunnel_egress_iface", netdev->egress_iface);
318 smap_add(smap, "tunnel_egress_iface_carrier",
319 netdev->carrier_status ? "up" : "down");
326 netdev_vport_update_flags(struct netdev *netdev OVS_UNUSED,
327 enum netdev_flags off,
328 enum netdev_flags on OVS_UNUSED,
329 enum netdev_flags *old_flagsp)
331 if (off & (NETDEV_UP | NETDEV_PROMISC)) {
335 *old_flagsp = NETDEV_UP | NETDEV_PROMISC;
340 netdev_vport_run(void)
345 seq = route_table_get_change_seq();
346 if (rt_change_seqno != seq) {
347 rt_change_seqno = seq;
348 netdev_vport_route_changed();
353 netdev_vport_wait(void)
358 seq = route_table_get_change_seq();
359 if (rt_change_seqno != seq) {
360 poll_immediate_wake();
364 /* Code specific to tunnel types. */
367 parse_key(const struct smap *args, const char *name,
368 bool *present, bool *flow)
375 s = smap_get(args, name);
377 s = smap_get(args, "key");
385 if (!strcmp(s, "flow")) {
389 return htonll(strtoull(s, NULL, 0));
394 set_tunnel_config(struct netdev *dev_, const struct smap *args)
396 struct netdev_vport *dev = netdev_vport_cast(dev_);
397 const char *name = netdev_get_name(dev_);
398 const char *type = netdev_get_type(dev_);
399 bool ipsec_mech_set, needs_dst_port, has_csum;
400 struct netdev_tunnel_config tnl_cfg;
401 struct smap_node *node;
403 has_csum = strstr(type, "gre");
404 ipsec_mech_set = false;
405 memset(&tnl_cfg, 0, sizeof tnl_cfg);
407 needs_dst_port = netdev_vport_needs_dst_port(dev_);
408 tnl_cfg.ipsec = strstr(type, "ipsec");
409 tnl_cfg.dont_fragment = true;
411 SMAP_FOR_EACH (node, args) {
412 if (!strcmp(node->key, "remote_ip")) {
413 struct in_addr in_addr;
414 if (!strcmp(node->value, "flow")) {
415 tnl_cfg.ip_dst_flow = true;
416 tnl_cfg.ip_dst = htonl(0);
417 } else if (lookup_ip(node->value, &in_addr)) {
418 VLOG_WARN("%s: bad %s 'remote_ip'", name, type);
419 } else if (ip_is_multicast(in_addr.s_addr)) {
420 VLOG_WARN("%s: multicast remote_ip="IP_FMT" not allowed",
421 name, IP_ARGS(in_addr.s_addr));
424 tnl_cfg.ip_dst = in_addr.s_addr;
426 } else if (!strcmp(node->key, "local_ip")) {
427 struct in_addr in_addr;
428 if (!strcmp(node->value, "flow")) {
429 tnl_cfg.ip_src_flow = true;
430 tnl_cfg.ip_src = htonl(0);
431 } else if (lookup_ip(node->value, &in_addr)) {
432 VLOG_WARN("%s: bad %s 'local_ip'", name, type);
434 tnl_cfg.ip_src = in_addr.s_addr;
436 } else if (!strcmp(node->key, "tos")) {
437 if (!strcmp(node->value, "inherit")) {
438 tnl_cfg.tos_inherit = true;
442 tos = strtol(node->value, &endptr, 0);
443 if (*endptr == '\0' && tos == (tos & IP_DSCP_MASK)) {
446 VLOG_WARN("%s: invalid TOS %s", name, node->value);
449 } else if (!strcmp(node->key, "ttl")) {
450 if (!strcmp(node->value, "inherit")) {
451 tnl_cfg.ttl_inherit = true;
453 tnl_cfg.ttl = atoi(node->value);
455 } else if (!strcmp(node->key, "dst_port") && needs_dst_port) {
456 tnl_cfg.dst_port = htons(atoi(node->value));
457 } else if (!strcmp(node->key, "csum") && has_csum) {
458 if (!strcmp(node->value, "true")) {
461 } else if (!strcmp(node->key, "df_default")) {
462 if (!strcmp(node->value, "false")) {
463 tnl_cfg.dont_fragment = false;
465 } else if (!strcmp(node->key, "peer_cert") && tnl_cfg.ipsec) {
466 if (smap_get(args, "certificate")) {
467 ipsec_mech_set = true;
469 const char *use_ssl_cert;
471 /* If the "use_ssl_cert" is true, then "certificate" and
472 * "private_key" will be pulled from the SSL table. The
473 * use of this option is strongly discouraged, since it
474 * will like be removed when multiple SSL configurations
475 * are supported by OVS.
477 use_ssl_cert = smap_get(args, "use_ssl_cert");
478 if (!use_ssl_cert || strcmp(use_ssl_cert, "true")) {
479 VLOG_ERR("%s: 'peer_cert' requires 'certificate' argument",
483 ipsec_mech_set = true;
485 } else if (!strcmp(node->key, "psk") && tnl_cfg.ipsec) {
486 ipsec_mech_set = true;
487 } else if (tnl_cfg.ipsec
488 && (!strcmp(node->key, "certificate")
489 || !strcmp(node->key, "private_key")
490 || !strcmp(node->key, "use_ssl_cert"))) {
491 /* Ignore options not used by the netdev. */
492 } else if (!strcmp(node->key, "key") ||
493 !strcmp(node->key, "in_key") ||
494 !strcmp(node->key, "out_key")) {
495 /* Handled separately below. */
497 VLOG_WARN("%s: unknown %s argument '%s'", name, type, node->key);
501 /* Add a default destination port for tunnel ports if none specified. */
502 if (!strcmp(type, "geneve") && !tnl_cfg.dst_port) {
503 tnl_cfg.dst_port = htons(GENEVE_DST_PORT);
506 if (!strcmp(type, "vxlan") && !tnl_cfg.dst_port) {
507 tnl_cfg.dst_port = htons(VXLAN_DST_PORT);
510 if (!strcmp(type, "lisp") && !tnl_cfg.dst_port) {
511 tnl_cfg.dst_port = htons(LISP_DST_PORT);
515 static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
516 static pid_t pid = 0;
519 ovs_mutex_lock(&mutex);
521 char *file_name = xasprintf("%s/%s", ovs_rundir(),
522 "ovs-monitor-ipsec.pid");
523 pid = read_pidfile(file_name);
526 ovs_mutex_unlock(&mutex);
530 VLOG_ERR("%s: IPsec requires the ovs-monitor-ipsec daemon",
535 if (smap_get(args, "peer_cert") && smap_get(args, "psk")) {
536 VLOG_ERR("%s: cannot define both 'peer_cert' and 'psk'", name);
540 if (!ipsec_mech_set) {
541 VLOG_ERR("%s: IPsec requires an 'peer_cert' or psk' argument",
547 if (!tnl_cfg.ip_dst && !tnl_cfg.ip_dst_flow) {
548 VLOG_ERR("%s: %s type requires valid 'remote_ip' argument",
552 if (tnl_cfg.ip_src_flow && !tnl_cfg.ip_dst_flow) {
553 VLOG_ERR("%s: %s type requires 'remote_ip=flow' with 'local_ip=flow'",
558 tnl_cfg.ttl = DEFAULT_TTL;
561 tnl_cfg.in_key = parse_key(args, "in_key",
562 &tnl_cfg.in_key_present,
563 &tnl_cfg.in_key_flow);
565 tnl_cfg.out_key = parse_key(args, "out_key",
566 &tnl_cfg.out_key_present,
567 &tnl_cfg.out_key_flow);
569 ovs_mutex_lock(&dev->mutex);
570 dev->tnl_cfg = tnl_cfg;
571 tunnel_check_status_change__(dev);
572 netdev_change_seq_changed(dev_);
573 ovs_mutex_unlock(&dev->mutex);
579 get_tunnel_config(const struct netdev *dev, struct smap *args)
581 struct netdev_vport *netdev = netdev_vport_cast(dev);
582 struct netdev_tunnel_config tnl_cfg;
584 ovs_mutex_lock(&netdev->mutex);
585 tnl_cfg = netdev->tnl_cfg;
586 ovs_mutex_unlock(&netdev->mutex);
588 if (tnl_cfg.ip_dst) {
589 smap_add_format(args, "remote_ip", IP_FMT, IP_ARGS(tnl_cfg.ip_dst));
590 } else if (tnl_cfg.ip_dst_flow) {
591 smap_add(args, "remote_ip", "flow");
594 if (tnl_cfg.ip_src) {
595 smap_add_format(args, "local_ip", IP_FMT, IP_ARGS(tnl_cfg.ip_src));
596 } else if (tnl_cfg.ip_src_flow) {
597 smap_add(args, "local_ip", "flow");
600 if (tnl_cfg.in_key_flow && tnl_cfg.out_key_flow) {
601 smap_add(args, "key", "flow");
602 } else if (tnl_cfg.in_key_present && tnl_cfg.out_key_present
603 && tnl_cfg.in_key == tnl_cfg.out_key) {
604 smap_add_format(args, "key", "%"PRIu64, ntohll(tnl_cfg.in_key));
606 if (tnl_cfg.in_key_flow) {
607 smap_add(args, "in_key", "flow");
608 } else if (tnl_cfg.in_key_present) {
609 smap_add_format(args, "in_key", "%"PRIu64,
610 ntohll(tnl_cfg.in_key));
613 if (tnl_cfg.out_key_flow) {
614 smap_add(args, "out_key", "flow");
615 } else if (tnl_cfg.out_key_present) {
616 smap_add_format(args, "out_key", "%"PRIu64,
617 ntohll(tnl_cfg.out_key));
621 if (tnl_cfg.ttl_inherit) {
622 smap_add(args, "ttl", "inherit");
623 } else if (tnl_cfg.ttl != DEFAULT_TTL) {
624 smap_add_format(args, "ttl", "%"PRIu8, tnl_cfg.ttl);
627 if (tnl_cfg.tos_inherit) {
628 smap_add(args, "tos", "inherit");
629 } else if (tnl_cfg.tos) {
630 smap_add_format(args, "tos", "0x%x", tnl_cfg.tos);
633 if (tnl_cfg.dst_port) {
634 uint16_t dst_port = ntohs(tnl_cfg.dst_port);
635 const char *type = netdev_get_type(dev);
637 if ((!strcmp("geneve", type) && dst_port != GENEVE_DST_PORT) ||
638 (!strcmp("vxlan", type) && dst_port != VXLAN_DST_PORT) ||
639 (!strcmp("lisp", type) && dst_port != LISP_DST_PORT)) {
640 smap_add_format(args, "dst_port", "%d", dst_port);
645 smap_add(args, "csum", "true");
648 if (!tnl_cfg.dont_fragment) {
649 smap_add(args, "df_default", "false");
655 /* Code specific to patch ports. */
657 /* If 'netdev' is a patch port, returns the name of its peer as a malloc()'d
658 * string that the caller must free.
660 * If 'netdev' is not a patch port, returns NULL. */
662 netdev_vport_patch_peer(const struct netdev *netdev_)
666 if (netdev_vport_is_patch(netdev_)) {
667 struct netdev_vport *netdev = netdev_vport_cast(netdev_);
669 ovs_mutex_lock(&netdev->mutex);
671 peer = xstrdup(netdev->peer);
673 ovs_mutex_unlock(&netdev->mutex);
680 netdev_vport_inc_rx(const struct netdev *netdev,
681 const struct dpif_flow_stats *stats)
683 if (is_vport_class(netdev_get_class(netdev))) {
684 struct netdev_vport *dev = netdev_vport_cast(netdev);
686 ovs_mutex_lock(&dev->mutex);
687 dev->stats.rx_packets += stats->n_packets;
688 dev->stats.rx_bytes += stats->n_bytes;
689 ovs_mutex_unlock(&dev->mutex);
694 netdev_vport_inc_tx(const struct netdev *netdev,
695 const struct dpif_flow_stats *stats)
697 if (is_vport_class(netdev_get_class(netdev))) {
698 struct netdev_vport *dev = netdev_vport_cast(netdev);
700 ovs_mutex_lock(&dev->mutex);
701 dev->stats.tx_packets += stats->n_packets;
702 dev->stats.tx_bytes += stats->n_bytes;
703 ovs_mutex_unlock(&dev->mutex);
708 get_patch_config(const struct netdev *dev_, struct smap *args)
710 struct netdev_vport *dev = netdev_vport_cast(dev_);
712 ovs_mutex_lock(&dev->mutex);
714 smap_add(args, "peer", dev->peer);
716 ovs_mutex_unlock(&dev->mutex);
722 set_patch_config(struct netdev *dev_, const struct smap *args)
724 struct netdev_vport *dev = netdev_vport_cast(dev_);
725 const char *name = netdev_get_name(dev_);
728 peer = smap_get(args, "peer");
730 VLOG_ERR("%s: patch type requires valid 'peer' argument", name);
734 if (smap_count(args) > 1) {
735 VLOG_ERR("%s: patch type takes only a 'peer' argument", name);
739 if (!strcmp(name, peer)) {
740 VLOG_ERR("%s: patch peer must not be self", name);
744 ovs_mutex_lock(&dev->mutex);
746 dev->peer = xstrdup(peer);
747 netdev_change_seq_changed(dev_);
748 ovs_mutex_unlock(&dev->mutex);
754 get_stats(const struct netdev *netdev, struct netdev_stats *stats)
756 struct netdev_vport *dev = netdev_vport_cast(netdev);
758 ovs_mutex_lock(&dev->mutex);
760 ovs_mutex_unlock(&dev->mutex);
765 #define VPORT_FUNCTIONS(GET_CONFIG, SET_CONFIG, \
766 GET_TUNNEL_CONFIG, GET_STATUS) \
771 netdev_vport_alloc, \
772 netdev_vport_construct, \
773 netdev_vport_destruct, \
774 netdev_vport_dealloc, \
778 NULL, /* get_numa_id */ \
779 NULL, /* set_multiq */ \
782 NULL, /* send_wait */ \
784 netdev_vport_set_etheraddr, \
785 netdev_vport_get_etheraddr, \
786 NULL, /* get_mtu */ \
787 NULL, /* set_mtu */ \
788 NULL, /* get_ifindex */ \
789 NULL, /* get_carrier */ \
790 NULL, /* get_carrier_resets */ \
791 NULL, /* get_miimon */ \
794 NULL, /* get_features */ \
795 NULL, /* set_advertisements */ \
797 NULL, /* set_policing */ \
798 NULL, /* get_qos_types */ \
799 NULL, /* get_qos_capabilities */ \
800 NULL, /* get_qos */ \
801 NULL, /* set_qos */ \
802 NULL, /* get_queue */ \
803 NULL, /* set_queue */ \
804 NULL, /* delete_queue */ \
805 NULL, /* get_queue_stats */ \
806 NULL, /* queue_dump_start */ \
807 NULL, /* queue_dump_next */ \
808 NULL, /* queue_dump_done */ \
809 NULL, /* dump_queue_stats */ \
811 NULL, /* get_in4 */ \
812 NULL, /* set_in4 */ \
813 NULL, /* get_in6 */ \
814 NULL, /* add_router */ \
815 NULL, /* get_next_hop */ \
817 NULL, /* arp_lookup */ \
819 netdev_vport_update_flags, \
821 NULL, /* rx_alloc */ \
822 NULL, /* rx_construct */ \
823 NULL, /* rx_destruct */ \
824 NULL, /* rx_dealloc */ \
825 NULL, /* rx_recv */ \
826 NULL, /* rx_wait */ \
829 #define TUNNEL_CLASS(NAME, DPIF_PORT) \
831 { NAME, VPORT_FUNCTIONS(get_tunnel_config, \
833 get_netdev_tunnel_config, \
834 tunnel_get_status) }}
837 netdev_vport_tunnel_register(void)
839 /* The name of the dpif_port should be short enough to accomodate adding
840 * a port number to the end if one is necessary. */
841 static const struct vport_class vport_classes[] = {
842 TUNNEL_CLASS("geneve", "genev_sys"),
843 TUNNEL_CLASS("gre", "gre_sys"),
844 TUNNEL_CLASS("ipsec_gre", "gre_sys"),
845 TUNNEL_CLASS("gre64", "gre64_sys"),
846 TUNNEL_CLASS("ipsec_gre64", "gre64_sys"),
847 TUNNEL_CLASS("vxlan", "vxlan_sys"),
848 TUNNEL_CLASS("lisp", "lisp_sys")
850 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
852 if (ovsthread_once_start(&once)) {
855 for (i = 0; i < ARRAY_SIZE(vport_classes); i++) {
856 netdev_register_provider(&vport_classes[i].netdev_class);
858 ovsthread_once_done(&once);
863 netdev_vport_patch_register(void)
865 static const struct vport_class patch_class =
867 { "patch", VPORT_FUNCTIONS(get_patch_config,
871 netdev_register_provider(&patch_class.netdev_class);