2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 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.
22 #include <netinet/in.h>
29 #include "dynamic-string.h"
30 #include "fatal-signal.h"
33 #include "netdev-provider.h"
34 #include "netdev-vport.h"
36 #include "openflow/openflow.h"
38 #include "poll-loop.h"
45 VLOG_DEFINE_THIS_MODULE(netdev);
47 COVERAGE_DEFINE(netdev_received);
48 COVERAGE_DEFINE(netdev_sent);
49 COVERAGE_DEFINE(netdev_add_router);
50 COVERAGE_DEFINE(netdev_get_stats);
52 struct netdev_saved_flags {
53 struct netdev *netdev;
54 struct list node; /* In struct netdev's saved_flags_list. */
55 enum netdev_flags saved_flags;
56 enum netdev_flags saved_values;
59 static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes);
61 /* All created network devices. */
62 static struct shash netdev_shash = SHASH_INITIALIZER(&netdev_shash);
64 /* This is set pretty low because we probably won't learn anything from the
65 * additional log messages. */
66 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
68 static void restore_all_flags(void *aux OVS_UNUSED);
69 void update_device_args(struct netdev *, const struct shash *args);
72 netdev_initialize(void)
79 fatal_signal_add_hook(restore_all_flags, NULL, NULL, true);
80 netdev_vport_patch_register();
83 netdev_register_provider(&netdev_linux_class);
84 netdev_register_provider(&netdev_internal_class);
85 netdev_register_provider(&netdev_tap_class);
86 netdev_vport_tunnel_register();
88 #if defined(__FreeBSD__) || defined(__NetBSD__)
89 netdev_register_provider(&netdev_tap_class);
90 netdev_register_provider(&netdev_bsd_class);
95 /* Performs periodic work needed by all the various kinds of netdevs.
97 * If your program opens any netdevs, it must call this function within its
102 struct shash_node *node;
103 SHASH_FOR_EACH(node, &netdev_classes) {
104 const struct netdev_class *netdev_class = node->data;
105 if (netdev_class->run) {
111 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
113 * If your program opens any netdevs, it must call this function within its
118 struct shash_node *node;
119 SHASH_FOR_EACH(node, &netdev_classes) {
120 const struct netdev_class *netdev_class = node->data;
121 if (netdev_class->wait) {
122 netdev_class->wait();
127 /* Initializes and registers a new netdev provider. After successful
128 * registration, new netdevs of that type can be opened using netdev_open(). */
130 netdev_register_provider(const struct netdev_class *new_class)
132 if (shash_find(&netdev_classes, new_class->type)) {
133 VLOG_WARN("attempted to register duplicate netdev provider: %s",
138 if (new_class->init) {
139 int error = new_class->init();
141 VLOG_ERR("failed to initialize %s network device class: %s",
142 new_class->type, strerror(error));
147 shash_add(&netdev_classes, new_class->type, new_class);
152 /* Unregisters a netdev provider. 'type' must have been previously
153 * registered and not currently be in use by any netdevs. After unregistration
154 * new netdevs of that type cannot be opened using netdev_open(). */
156 netdev_unregister_provider(const char *type)
158 struct shash_node *del_node, *netdev_node;
160 del_node = shash_find(&netdev_classes, type);
162 VLOG_WARN("attempted to unregister a netdev provider that is not "
163 "registered: %s", type);
167 SHASH_FOR_EACH (netdev_node, &netdev_shash) {
168 struct netdev *netdev = netdev_node->data;
169 if (!strcmp(netdev->netdev_class->type, type)) {
170 VLOG_WARN("attempted to unregister in use netdev provider: %s",
176 shash_delete(&netdev_classes, del_node);
181 const struct netdev_class *
182 netdev_lookup_provider(const char *type)
185 return shash_find_data(&netdev_classes, type && type[0] ? type : "system");
188 /* Clears 'types' and enumerates the types of all currently registered netdev
189 * providers into it. The caller must first initialize the sset. */
191 netdev_enumerate_types(struct sset *types)
193 struct shash_node *node;
198 SHASH_FOR_EACH(node, &netdev_classes) {
199 const struct netdev_class *netdev_class = node->data;
200 sset_add(types, netdev_class->type);
204 /* Check that the network device name is not the same as any of the registered
205 * vport providers' dpif_port name (dpif_port is NULL if the vport provider
206 * does not define it) or the datapath internal port name (e.g. ovs-system).
208 * Returns true if there is a name conflict, false otherwise. */
210 netdev_is_reserved_name(const char *name)
212 struct shash_node *node;
215 SHASH_FOR_EACH (node, &netdev_classes) {
216 const char *dpif_port;
217 dpif_port = netdev_vport_class_get_dpif_port(node->data);
218 if (dpif_port && !strcmp(dpif_port, name)) {
223 if (!strncmp(name, "ovs-", 4)) {
228 dp_enumerate_types(&types);
229 SSET_FOR_EACH (type, &types) {
230 if (!strcmp(name+4, type)) {
231 sset_destroy(&types);
235 sset_destroy(&types);
241 /* Opens the network device named 'name' (e.g. "eth0") of the specified 'type'
242 * (e.g. "system") and returns zero if successful, otherwise a positive errno
243 * value. On success, sets '*netdevp' to the new network device, otherwise to
246 * Some network devices may need to be configured (with netdev_set_config())
247 * before they can be used. */
249 netdev_open(const char *name, const char *type, struct netdev **netdevp)
251 struct netdev *netdev;
257 netdev = shash_find_data(&netdev_shash, name);
259 const struct netdev_class *class;
261 class = netdev_lookup_provider(type);
263 VLOG_WARN("could not create netdev %s of unknown type %s",
267 error = class->create(class, name, &netdev);
271 ovs_assert(netdev->netdev_class == class);
280 /* Returns a reference to 'netdev_' for the caller to own. */
282 netdev_ref(const struct netdev *netdev_)
284 struct netdev *netdev = CONST_CAST(struct netdev *, netdev_);
286 ovs_assert(netdev->ref_cnt > 0);
291 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
292 * or NULL if none are needed. */
294 netdev_set_config(struct netdev *netdev, const struct smap *args)
296 if (netdev->netdev_class->set_config) {
297 struct smap no_args = SMAP_INITIALIZER(&no_args);
298 return netdev->netdev_class->set_config(netdev,
299 args ? args : &no_args);
300 } else if (args && !smap_is_empty(args)) {
301 VLOG_WARN("%s: arguments provided to device that is not configurable",
302 netdev_get_name(netdev));
308 /* Returns the current configuration for 'netdev' in 'args'. The caller must
309 * have already initialized 'args' with smap_init(). Returns 0 on success, in
310 * which case 'args' will be filled with 'netdev''s configuration. On failure
311 * returns a positive errno value, in which case 'args' will be empty.
313 * The caller owns 'args' and its contents and must eventually free them with
316 netdev_get_config(const struct netdev *netdev, struct smap *args)
321 if (netdev->netdev_class->get_config) {
322 error = netdev->netdev_class->get_config(netdev, args);
333 const struct netdev_tunnel_config *
334 netdev_get_tunnel_config(const struct netdev *netdev)
336 if (netdev->netdev_class->get_tunnel_config) {
337 return netdev->netdev_class->get_tunnel_config(netdev);
344 netdev_unref(struct netdev *dev)
346 ovs_assert(dev->ref_cnt);
347 if (!--dev->ref_cnt) {
348 netdev_uninit(dev, true);
352 /* Closes and destroys 'netdev'. */
354 netdev_close(struct netdev *netdev)
357 netdev_unref(netdev);
361 /* Parses 'netdev_name_', which is of the form [type@]name into its component
362 * pieces. 'name' and 'type' must be freed by the caller. */
364 netdev_parse_name(const char *netdev_name_, char **name, char **type)
366 char *netdev_name = xstrdup(netdev_name_);
369 separator = strchr(netdev_name, '@');
373 *name = xstrdup(separator + 1);
376 *type = xstrdup("system");
381 netdev_rx_open(struct netdev *netdev, struct netdev_rx **rxp)
385 error = (netdev->netdev_class->rx_open
386 ? netdev->netdev_class->rx_open(netdev, rxp)
389 ovs_assert((*rxp)->netdev == netdev);
398 netdev_rx_close(struct netdev_rx *rx)
401 struct netdev *dev = rx->netdev;
403 rx->rx_class->destroy(rx);
409 netdev_rx_recv(struct netdev_rx *rx, struct ofpbuf *buffer)
413 ovs_assert(buffer->size == 0);
414 ovs_assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
416 retval = rx->rx_class->recv(rx, buffer->data, ofpbuf_tailroom(buffer));
418 COVERAGE_INC(netdev_received);
419 buffer->size += retval;
420 if (buffer->size < ETH_TOTAL_MIN) {
421 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
430 netdev_rx_wait(struct netdev_rx *rx)
432 rx->rx_class->wait(rx);
436 netdev_rx_drain(struct netdev_rx *rx)
438 return rx->rx_class->drain ? rx->rx_class->drain(rx) : 0;
441 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
442 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
443 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
444 * the packet is too big or too small to transmit on the device.
446 * The caller retains ownership of 'buffer' in all cases.
448 * The kernel maintains a packet transmission queue, so the caller is not
449 * expected to do additional queuing of packets.
451 * Some network devices may not implement support for this function. In such
452 * cases this function will always return EOPNOTSUPP. */
454 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
458 error = (netdev->netdev_class->send
459 ? netdev->netdev_class->send(netdev, buffer->data, buffer->size)
462 COVERAGE_INC(netdev_sent);
467 /* Registers with the poll loop to wake up from the next call to poll_block()
468 * when the packet transmission queue has sufficient room to transmit a packet
469 * with netdev_send().
471 * The kernel maintains a packet transmission queue, so the client is not
472 * expected to do additional queuing of packets. Thus, this function is
473 * unlikely to ever be used. It is included for completeness. */
475 netdev_send_wait(struct netdev *netdev)
477 if (netdev->netdev_class->send_wait) {
478 netdev->netdev_class->send_wait(netdev);
482 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
483 * otherwise a positive errno value. */
485 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
487 return netdev->netdev_class->set_etheraddr(netdev, mac);
490 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
491 * the MAC address into 'mac'. On failure, returns a positive errno value and
492 * clears 'mac' to all-zeros. */
494 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
496 return netdev->netdev_class->get_etheraddr(netdev, mac);
499 /* Returns the name of the network device that 'netdev' represents,
500 * e.g. "eth0". The caller must not modify or free the returned string. */
502 netdev_get_name(const struct netdev *netdev)
507 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
508 * (and received) packets, in bytes, not including the hardware header; thus,
509 * this is typically 1500 bytes for Ethernet devices.
511 * If successful, returns 0 and stores the MTU size in '*mtup'. Returns
512 * EOPNOTSUPP if 'netdev' does not have an MTU (as e.g. some tunnels do not).
513 * On other failure, returns a positive errno value. On failure, sets '*mtup'
516 netdev_get_mtu(const struct netdev *netdev, int *mtup)
518 const struct netdev_class *class = netdev->netdev_class;
521 error = class->get_mtu ? class->get_mtu(netdev, mtup) : EOPNOTSUPP;
524 if (error != EOPNOTSUPP) {
525 VLOG_DBG_RL(&rl, "failed to retrieve MTU for network device %s: "
526 "%s", netdev_get_name(netdev), strerror(error));
532 /* Sets the MTU of 'netdev'. The MTU is the maximum size of transmitted
533 * (and received) packets, in bytes.
535 * If successful, returns 0. Returns EOPNOTSUPP if 'netdev' does not have an
536 * MTU (as e.g. some tunnels do not). On other failure, returns a positive
539 netdev_set_mtu(const struct netdev *netdev, int mtu)
541 const struct netdev_class *class = netdev->netdev_class;
544 error = class->set_mtu ? class->set_mtu(netdev, mtu) : EOPNOTSUPP;
545 if (error && error != EOPNOTSUPP) {
546 VLOG_DBG_RL(&rl, "failed to set MTU for network device %s: %s",
547 netdev_get_name(netdev), strerror(error));
553 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
554 * failure, returns a negative errno value.
556 * The desired semantics of the ifindex value are a combination of those
557 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
558 * value should be unique within a host and remain stable at least until
559 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
560 * but many systems do not follow this rule anyhow.
562 * Some network devices may not implement support for this function. In such
563 * cases this function will always return -EOPNOTSUPP.
566 netdev_get_ifindex(const struct netdev *netdev)
568 int (*get_ifindex)(const struct netdev *);
570 get_ifindex = netdev->netdev_class->get_ifindex;
572 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
575 /* Stores the features supported by 'netdev' into each of '*current',
576 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
577 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
578 * successful, otherwise a positive errno value. On failure, all of the
579 * passed-in values are set to 0.
581 * Some network devices may not implement support for this function. In such
582 * cases this function will always return EOPNOTSUPP. */
584 netdev_get_features(const struct netdev *netdev,
585 enum netdev_features *current,
586 enum netdev_features *advertised,
587 enum netdev_features *supported,
588 enum netdev_features *peer)
590 int (*get_features)(const struct netdev *netdev,
591 enum netdev_features *current,
592 enum netdev_features *advertised,
593 enum netdev_features *supported,
594 enum netdev_features *peer);
595 enum netdev_features dummy[4];
602 advertised = &dummy[1];
605 supported = &dummy[2];
611 get_features = netdev->netdev_class->get_features;
613 ? get_features(netdev, current, advertised, supported,
617 *current = *advertised = *supported = *peer = 0;
622 /* Returns the maximum speed of a network connection that has the NETDEV_F_*
623 * bits in 'features', in bits per second. If no bits that indicate a speed
624 * are set in 'features', returns 'default_bps'. */
626 netdev_features_to_bps(enum netdev_features features,
627 uint64_t default_bps)
630 F_1000000MB = NETDEV_F_1TB_FD,
631 F_100000MB = NETDEV_F_100GB_FD,
632 F_40000MB = NETDEV_F_40GB_FD,
633 F_10000MB = NETDEV_F_10GB_FD,
634 F_1000MB = NETDEV_F_1GB_HD | NETDEV_F_1GB_FD,
635 F_100MB = NETDEV_F_100MB_HD | NETDEV_F_100MB_FD,
636 F_10MB = NETDEV_F_10MB_HD | NETDEV_F_10MB_FD
639 return ( features & F_1000000MB ? UINT64_C(1000000000000)
640 : features & F_100000MB ? UINT64_C(100000000000)
641 : features & F_40000MB ? UINT64_C(40000000000)
642 : features & F_10000MB ? UINT64_C(10000000000)
643 : features & F_1000MB ? UINT64_C(1000000000)
644 : features & F_100MB ? UINT64_C(100000000)
645 : features & F_10MB ? UINT64_C(10000000)
649 /* Returns true if any of the NETDEV_F_* bits that indicate a full-duplex link
650 * are set in 'features', otherwise false. */
652 netdev_features_is_full_duplex(enum netdev_features features)
654 return (features & (NETDEV_F_10MB_FD | NETDEV_F_100MB_FD | NETDEV_F_1GB_FD
655 | NETDEV_F_10GB_FD | NETDEV_F_40GB_FD
656 | NETDEV_F_100GB_FD | NETDEV_F_1TB_FD)) != 0;
659 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
660 * successful, otherwise a positive errno value. */
662 netdev_set_advertisements(struct netdev *netdev,
663 enum netdev_features advertise)
665 return (netdev->netdev_class->set_advertisements
666 ? netdev->netdev_class->set_advertisements(
671 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
672 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
673 * errno value and sets '*address' to 0 (INADDR_ANY).
675 * The following error values have well-defined meanings:
677 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
679 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
681 * 'address' or 'netmask' or both may be null, in which case the address or
682 * netmask is not reported. */
684 netdev_get_in4(const struct netdev *netdev,
685 struct in_addr *address_, struct in_addr *netmask_)
687 struct in_addr address;
688 struct in_addr netmask;
691 error = (netdev->netdev_class->get_in4
692 ? netdev->netdev_class->get_in4(netdev,
696 address_->s_addr = error ? 0 : address.s_addr;
699 netmask_->s_addr = error ? 0 : netmask.s_addr;
704 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
705 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
706 * positive errno value. */
708 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
710 return (netdev->netdev_class->set_in4
711 ? netdev->netdev_class->set_in4(netdev, addr, mask)
715 /* Obtains ad IPv4 address from device name and save the address in
716 * in4. Returns 0 if successful, otherwise a positive errno value.
719 netdev_get_in4_by_name(const char *device_name, struct in_addr *in4)
721 struct netdev *netdev;
724 error = netdev_open(device_name, "system", &netdev);
726 in4->s_addr = htonl(0);
730 error = netdev_get_in4(netdev, in4, NULL);
731 netdev_close(netdev);
735 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
738 netdev_add_router(struct netdev *netdev, struct in_addr router)
740 COVERAGE_INC(netdev_add_router);
741 return (netdev->netdev_class->add_router
742 ? netdev->netdev_class->add_router(netdev, router)
746 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
747 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
748 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
749 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
750 * a directly connected network) in '*next_hop' and a copy of the name of the
751 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
752 * responsible for freeing '*netdev_name' (by calling free()). */
754 netdev_get_next_hop(const struct netdev *netdev,
755 const struct in_addr *host, struct in_addr *next_hop,
758 int error = (netdev->netdev_class->get_next_hop
759 ? netdev->netdev_class->get_next_hop(
760 host, next_hop, netdev_name)
763 next_hop->s_addr = 0;
769 /* Populates 'smap' with status information.
771 * Populates 'smap' with 'netdev' specific status information. This
772 * information may be used to populate the status column of the Interface table
773 * as defined in ovs-vswitchd.conf.db(5). */
775 netdev_get_status(const struct netdev *netdev, struct smap *smap)
777 return (netdev->netdev_class->get_status
778 ? netdev->netdev_class->get_status(netdev, smap)
782 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
783 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
784 * all-zero-bits (in6addr_any).
786 * The following error values have well-defined meanings:
788 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
790 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
792 * 'in6' may be null, in which case the address itself is not reported. */
794 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
796 struct in6_addr dummy;
799 error = (netdev->netdev_class->get_in6
800 ? netdev->netdev_class->get_in6(netdev,
804 memset(in6, 0, sizeof *in6);
809 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
810 * 'on'. Returns 0 if successful, otherwise a positive errno value. */
812 do_update_flags(struct netdev *netdev, enum netdev_flags off,
813 enum netdev_flags on, enum netdev_flags *old_flagsp,
814 struct netdev_saved_flags **sfp)
816 struct netdev_saved_flags *sf = NULL;
817 enum netdev_flags old_flags;
820 error = netdev->netdev_class->update_flags(netdev, off & ~on, on,
823 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
824 off || on ? "set" : "get", netdev_get_name(netdev),
827 } else if ((off || on) && sfp) {
828 enum netdev_flags new_flags = (old_flags & ~off) | on;
829 enum netdev_flags changed_flags = old_flags ^ new_flags;
831 *sfp = sf = xmalloc(sizeof *sf);
833 list_push_front(&netdev->saved_flags_list, &sf->node);
834 sf->saved_flags = changed_flags;
835 sf->saved_values = changed_flags & new_flags;
842 *old_flagsp = old_flags;
851 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
852 * Returns 0 if successful, otherwise a positive errno value. On failure,
853 * stores 0 into '*flagsp'. */
855 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
857 struct netdev *netdev = CONST_CAST(struct netdev *, netdev_);
858 return do_update_flags(netdev, 0, 0, flagsp, NULL);
861 /* Sets the flags for 'netdev' to 'flags'.
862 * Returns 0 if successful, otherwise a positive errno value. */
864 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
865 struct netdev_saved_flags **sfp)
867 return do_update_flags(netdev, -1, flags, NULL, sfp);
870 /* Turns on the specified 'flags' on 'netdev':
872 * - On success, returns 0. If 'sfp' is nonnull, sets '*sfp' to a newly
873 * allocated 'struct netdev_saved_flags *' that may be passed to
874 * netdev_restore_flags() to restore the original values of 'flags' on
875 * 'netdev' (this will happen automatically at program termination if
876 * netdev_restore_flags() is never called) , or to NULL if no flags were
879 * - On failure, returns a positive errno value. If 'sfp' is nonnull, sets
882 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
883 struct netdev_saved_flags **sfp)
885 return do_update_flags(netdev, 0, flags, NULL, sfp);
888 /* Turns off the specified 'flags' on 'netdev'. See netdev_turn_flags_on() for
889 * details of the interface. */
891 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
892 struct netdev_saved_flags **sfp)
894 return do_update_flags(netdev, flags, 0, NULL, sfp);
897 /* Restores the flags that were saved in 'sf', and destroys 'sf'.
898 * Does nothing if 'sf' is NULL. */
900 netdev_restore_flags(struct netdev_saved_flags *sf)
903 struct netdev *netdev = sf->netdev;
904 enum netdev_flags old_flags;
906 netdev->netdev_class->update_flags(netdev,
907 sf->saved_flags & sf->saved_values,
908 sf->saved_flags & ~sf->saved_values,
910 list_remove(&sf->node);
913 netdev_unref(netdev);
917 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
918 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
919 * returns 0. Otherwise, it returns a positive errno value; in particular,
920 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
922 netdev_arp_lookup(const struct netdev *netdev,
923 ovs_be32 ip, uint8_t mac[ETH_ADDR_LEN])
925 int error = (netdev->netdev_class->arp_lookup
926 ? netdev->netdev_class->arp_lookup(netdev,
930 memset(mac, 0, ETH_ADDR_LEN);
935 /* Returns true if carrier is active (link light is on) on 'netdev'. */
937 netdev_get_carrier(const struct netdev *netdev)
940 enum netdev_flags flags;
943 netdev_get_flags(netdev, &flags);
944 if (!(flags & NETDEV_UP)) {
948 if (!netdev->netdev_class->get_carrier) {
952 error = netdev->netdev_class->get_carrier(netdev,
955 VLOG_DBG("%s: failed to get network device carrier status, assuming "
956 "down: %s", netdev_get_name(netdev), strerror(error));
963 /* Returns the number of times 'netdev''s carrier has changed. */
965 netdev_get_carrier_resets(const struct netdev *netdev)
967 return (netdev->netdev_class->get_carrier_resets
968 ? netdev->netdev_class->get_carrier_resets(netdev)
972 /* Attempts to force netdev_get_carrier() to poll 'netdev''s MII registers for
973 * link status instead of checking 'netdev''s carrier. 'netdev''s MII
974 * registers will be polled once ever 'interval' milliseconds. If 'netdev'
975 * does not support MII, another method may be used as a fallback. If
976 * 'interval' is less than or equal to zero, reverts netdev_get_carrier() to
977 * its normal behavior.
979 * Returns 0 if successful, otherwise a positive errno value. */
981 netdev_set_miimon_interval(struct netdev *netdev, long long int interval)
983 return (netdev->netdev_class->set_miimon_interval
984 ? netdev->netdev_class->set_miimon_interval(netdev, interval)
988 /* Retrieves current device stats for 'netdev'. */
990 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
994 COVERAGE_INC(netdev_get_stats);
995 error = (netdev->netdev_class->get_stats
996 ? netdev->netdev_class->get_stats(netdev, stats)
999 memset(stats, 0xff, sizeof *stats);
1004 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
1005 * Returns 0 if successful, otherwise a positive errno value.
1007 * This will probably fail for most network devices. Some devices might only
1008 * allow setting their stats to 0. */
1010 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
1012 return (netdev->netdev_class->set_stats
1013 ? netdev->netdev_class->set_stats(netdev, stats)
1017 /* Attempts to set input rate limiting (policing) policy, such that up to
1018 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
1019 * size of 'kbits' kb. */
1021 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
1022 uint32_t kbits_burst)
1024 return (netdev->netdev_class->set_policing
1025 ? netdev->netdev_class->set_policing(netdev,
1026 kbits_rate, kbits_burst)
1030 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
1031 * empty if 'netdev' does not support QoS. Any names added to 'types' should
1032 * be documented as valid for the "type" column in the "QoS" table in
1033 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1035 * Every network device supports disabling QoS with a type of "", but this type
1036 * will not be added to 'types'.
1038 * The caller must initialize 'types' (e.g. with sset_init()) before calling
1039 * this function. The caller is responsible for destroying 'types' (e.g. with
1040 * sset_destroy()) when it is no longer needed.
1042 * Returns 0 if successful, otherwise a positive errno value. */
1044 netdev_get_qos_types(const struct netdev *netdev, struct sset *types)
1046 const struct netdev_class *class = netdev->netdev_class;
1047 return (class->get_qos_types
1048 ? class->get_qos_types(netdev, types)
1052 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
1053 * which should be "" or one of the types returned by netdev_get_qos_types()
1054 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
1055 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
1056 * 'caps' to all zeros. */
1058 netdev_get_qos_capabilities(const struct netdev *netdev, const char *type,
1059 struct netdev_qos_capabilities *caps)
1061 const struct netdev_class *class = netdev->netdev_class;
1064 int retval = (class->get_qos_capabilities
1065 ? class->get_qos_capabilities(netdev, type, caps)
1068 memset(caps, 0, sizeof *caps);
1072 /* Every netdev supports turning off QoS. */
1073 memset(caps, 0, sizeof *caps);
1078 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1079 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1080 * the number of queues (zero on failure) in '*n_queuesp'.
1082 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1084 netdev_get_n_queues(const struct netdev *netdev,
1085 const char *type, unsigned int *n_queuesp)
1087 struct netdev_qos_capabilities caps;
1090 retval = netdev_get_qos_capabilities(netdev, type, &caps);
1091 *n_queuesp = caps.n_queues;
1095 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1096 * stores the name of the current form of QoS into '*typep', stores any details
1097 * of configuration as string key-value pairs in 'details', and returns 0. On
1098 * failure, sets '*typep' to NULL and returns a positive errno value.
1100 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1102 * The caller must initialize 'details' as an empty smap (e.g. with
1103 * smap_init()) before calling this function. The caller must free 'details'
1104 * when it is no longer needed (e.g. with smap_destroy()).
1106 * The caller must not modify or free '*typep'.
1108 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1109 * 'netdev'. The contents of 'details' should be documented as valid for
1110 * '*typep' in the "other_config" column in the "QoS" table in
1111 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1113 netdev_get_qos(const struct netdev *netdev,
1114 const char **typep, struct smap *details)
1116 const struct netdev_class *class = netdev->netdev_class;
1119 if (class->get_qos) {
1120 retval = class->get_qos(netdev, typep, details);
1123 smap_clear(details);
1127 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1133 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1134 * with details of configuration from 'details'. Returns 0 if successful,
1135 * otherwise a positive errno value. On error, the previous QoS configuration
1138 * When this function changes the type of QoS (not just 'details'), this also
1139 * resets all queue configuration for 'netdev' to their defaults (which depend
1140 * on the specific type of QoS). Otherwise, the queue configuration for
1141 * 'netdev' is unchanged.
1143 * 'type' should be "" (to disable QoS) or one of the types returned by
1144 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1145 * documented as valid for the given 'type' in the "other_config" column in the
1146 * "QoS" table in vswitchd/vswitch.xml (which is built as
1147 * ovs-vswitchd.conf.db(8)).
1149 * NULL may be specified for 'details' if there are no configuration
1152 netdev_set_qos(struct netdev *netdev,
1153 const char *type, const struct smap *details)
1155 const struct netdev_class *class = netdev->netdev_class;
1161 if (class->set_qos) {
1163 static const struct smap empty = SMAP_INITIALIZER(&empty);
1166 return class->set_qos(netdev, type, details);
1168 return *type ? EOPNOTSUPP : 0;
1172 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1173 * successful, adds that information as string key-value pairs to 'details'.
1174 * Returns 0 if successful, otherwise a positive errno value.
1176 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1177 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1179 * The returned contents of 'details' should be documented as valid for the
1180 * given 'type' in the "other_config" column in the "Queue" table in
1181 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1183 * The caller must initialize 'details' (e.g. with smap_init()) before calling
1184 * this function. The caller must free 'details' when it is no longer needed
1185 * (e.g. with smap_destroy()). */
1187 netdev_get_queue(const struct netdev *netdev,
1188 unsigned int queue_id, struct smap *details)
1190 const struct netdev_class *class = netdev->netdev_class;
1193 retval = (class->get_queue
1194 ? class->get_queue(netdev, queue_id, details)
1197 smap_clear(details);
1202 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1203 * string pairs in 'details'. The contents of 'details' should be documented
1204 * as valid for the given 'type' in the "other_config" column in the "Queue"
1205 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1206 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1207 * given queue's configuration should be unmodified.
1209 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1210 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1212 * This function does not modify 'details', and the caller retains ownership of
1215 netdev_set_queue(struct netdev *netdev,
1216 unsigned int queue_id, const struct smap *details)
1218 const struct netdev_class *class = netdev->netdev_class;
1219 return (class->set_queue
1220 ? class->set_queue(netdev, queue_id, details)
1224 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1225 * of QoS may have a fixed set of queues, in which case attempts to delete them
1226 * will fail with EOPNOTSUPP.
1228 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1229 * given queue will be unmodified.
1231 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1232 * the current form of QoS (e.g. as returned by
1233 * netdev_get_n_queues(netdev)). */
1235 netdev_delete_queue(struct netdev *netdev, unsigned int queue_id)
1237 const struct netdev_class *class = netdev->netdev_class;
1238 return (class->delete_queue
1239 ? class->delete_queue(netdev, queue_id)
1243 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1244 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1245 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1246 * positive errno value and fills 'stats' with all-1-bits. */
1248 netdev_get_queue_stats(const struct netdev *netdev, unsigned int queue_id,
1249 struct netdev_queue_stats *stats)
1251 const struct netdev_class *class = netdev->netdev_class;
1254 retval = (class->get_queue_stats
1255 ? class->get_queue_stats(netdev, queue_id, stats)
1258 memset(stats, 0xff, sizeof *stats);
1263 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1264 * its configuration, and the 'aux' specified by the caller. The order of
1265 * iteration is unspecified, but (when successful) each queue is visited
1268 * Calling this function may be more efficient than calling netdev_get_queue()
1271 * 'cb' must not modify or free the 'details' argument passed in. It may
1272 * delete or modify the queue passed in as its 'queue_id' argument. It may
1273 * modify but must not delete any other queue within 'netdev'. 'cb' should not
1274 * add new queues because this may cause some queues to be visited twice or not
1277 * Returns 0 if successful, otherwise a positive errno value. On error, some
1278 * configured queues may not have been included in the iteration. */
1280 netdev_dump_queues(const struct netdev *netdev,
1281 netdev_dump_queues_cb *cb, void *aux)
1283 const struct netdev_class *class = netdev->netdev_class;
1284 return (class->dump_queues
1285 ? class->dump_queues(netdev, cb, aux)
1289 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1290 * its statistics, and the 'aux' specified by the caller. The order of
1291 * iteration is unspecified, but (when successful) each queue is visited
1294 * Calling this function may be more efficient than calling
1295 * netdev_get_queue_stats() for every queue.
1297 * 'cb' must not modify or free the statistics passed in.
1299 * Returns 0 if successful, otherwise a positive errno value. On error, some
1300 * configured queues may not have been included in the iteration. */
1302 netdev_dump_queue_stats(const struct netdev *netdev,
1303 netdev_dump_queue_stats_cb *cb, void *aux)
1305 const struct netdev_class *class = netdev->netdev_class;
1306 return (class->dump_queue_stats
1307 ? class->dump_queue_stats(netdev, cb, aux)
1311 /* Returns a sequence number which indicates changes in one of 'netdev''s
1312 * properties. The returned sequence will be nonzero so that callers have a
1313 * value which they may use as a reset when tracking 'netdev'.
1315 * The returned sequence number will change whenever 'netdev''s flags,
1316 * features, ethernet address, or carrier changes. It may change for other
1317 * reasons as well, or no reason at all. */
1319 netdev_change_seq(const struct netdev *netdev)
1321 return netdev->netdev_class->change_seq(netdev);
1324 /* Initializes 'netdev' as a netdev device named 'name' of the specified
1325 * 'netdev_class'. This function is ordinarily called from a netdev provider's
1326 * 'create' function.
1328 * This function adds 'netdev' to a netdev-owned shash, so it is very important
1329 * that 'netdev' only be freed after calling netdev_uninit(). */
1331 netdev_init(struct netdev *netdev, const char *name,
1332 const struct netdev_class *netdev_class)
1334 ovs_assert(!shash_find(&netdev_shash, name));
1336 memset(netdev, 0, sizeof *netdev);
1337 netdev->netdev_class = netdev_class;
1338 netdev->name = xstrdup(name);
1339 netdev->node = shash_add(&netdev_shash, name, netdev);
1340 list_init(&netdev->saved_flags_list);
1343 /* Undoes the results of initialization.
1345 * Normally this function does not need to be called as netdev_close has
1346 * the same effect when the refcount drops to zero.
1347 * However, it may be called by providers due to an error on creation
1348 * that occurs after initialization. It this case netdev_close() would
1349 * never be called. */
1351 netdev_uninit(struct netdev *netdev, bool destroy)
1353 char *name = netdev->name;
1355 ovs_assert(!netdev->ref_cnt);
1356 ovs_assert(list_is_empty(&netdev->saved_flags_list));
1358 shash_delete(&netdev_shash, netdev->node);
1361 netdev->netdev_class->destroy(netdev);
1366 /* Returns the class type of 'netdev'.
1368 * The caller must not free the returned value. */
1370 netdev_get_type(const struct netdev *netdev)
1372 return netdev->netdev_class->type;
1375 /* Returns the class associated with 'netdev'. */
1376 const struct netdev_class *
1377 netdev_get_class(const struct netdev *netdev)
1379 return netdev->netdev_class;
1382 /* Returns the netdev with 'name' or NULL if there is none.
1384 * The caller must not free the returned value. */
1386 netdev_from_name(const char *name)
1388 return shash_find_data(&netdev_shash, name);
1391 /* Fills 'device_list' with devices that match 'netdev_class'.
1393 * The caller is responsible for initializing and destroying 'device_list'
1394 * but the contained netdevs must not be freed. */
1396 netdev_get_devices(const struct netdev_class *netdev_class,
1397 struct shash *device_list)
1399 struct shash_node *node;
1400 SHASH_FOR_EACH (node, &netdev_shash) {
1401 struct netdev *dev = node->data;
1403 if (dev->netdev_class == netdev_class) {
1404 shash_add(device_list, node->name, node->data);
1410 netdev_get_type_from_name(const char *name)
1412 const struct netdev *dev = netdev_from_name(name);
1413 return dev ? netdev_get_type(dev) : NULL;
1417 netdev_rx_init(struct netdev_rx *rx, struct netdev *netdev,
1418 const struct netdev_rx_class *class)
1420 ovs_assert(netdev->ref_cnt > 0);
1421 rx->rx_class = class;
1422 rx->netdev = netdev;
1426 netdev_rx_uninit(struct netdev_rx *rx OVS_UNUSED)
1428 /* Nothing to do. */
1432 netdev_rx_get_netdev(const struct netdev_rx *rx)
1434 ovs_assert(rx->netdev->ref_cnt > 0);
1439 netdev_rx_get_name(const struct netdev_rx *rx)
1441 return netdev_get_name(netdev_rx_get_netdev(rx));
1445 restore_all_flags(void *aux OVS_UNUSED)
1447 struct shash_node *node;
1449 SHASH_FOR_EACH (node, &netdev_shash) {
1450 struct netdev *netdev = node->data;
1451 const struct netdev_saved_flags *sf;
1452 enum netdev_flags saved_values;
1453 enum netdev_flags saved_flags;
1455 saved_values = saved_flags = 0;
1456 LIST_FOR_EACH (sf, node, &netdev->saved_flags_list) {
1457 saved_flags |= sf->saved_flags;
1458 saved_values &= ~sf->saved_flags;
1459 saved_values |= sf->saved_flags & sf->saved_values;
1462 enum netdev_flags old_flags;
1464 netdev->netdev_class->update_flags(netdev,
1465 saved_flags & saved_values,
1466 saved_flags & ~saved_values,