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>
28 #include "dynamic-string.h"
29 #include "fatal-signal.h"
32 #include "netdev-provider.h"
33 #include "netdev-vport.h"
35 #include "openflow/openflow.h"
37 #include "poll-loop.h"
44 VLOG_DEFINE_THIS_MODULE(netdev);
46 COVERAGE_DEFINE(netdev_received);
47 COVERAGE_DEFINE(netdev_sent);
48 COVERAGE_DEFINE(netdev_add_router);
49 COVERAGE_DEFINE(netdev_get_stats);
51 struct netdev_saved_flags {
52 struct netdev *netdev;
53 struct list node; /* In struct netdev's saved_flags_list. */
54 enum netdev_flags saved_flags;
55 enum netdev_flags saved_values;
58 static struct shash netdev_classes = SHASH_INITIALIZER(&netdev_classes);
60 /* All created network devices. */
61 static struct shash netdev_shash = SHASH_INITIALIZER(&netdev_shash);
63 /* This is set pretty low because we probably won't learn anything from the
64 * additional log messages. */
65 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
67 static void restore_all_flags(void *aux OVS_UNUSED);
68 void update_device_args(struct netdev *, const struct shash *args);
71 netdev_initialize(void)
78 fatal_signal_add_hook(restore_all_flags, NULL, NULL, true);
79 netdev_vport_patch_register();
82 netdev_register_provider(&netdev_linux_class);
83 netdev_register_provider(&netdev_internal_class);
84 netdev_register_provider(&netdev_tap_class);
85 netdev_vport_tunnel_register();
88 netdev_register_provider(&netdev_tap_class);
89 netdev_register_provider(&netdev_bsd_class);
91 netdev_register_provider(&netdev_tunnel_class);
92 netdev_register_provider(&netdev_pltap_class);
96 /* Performs periodic work needed by all the various kinds of netdevs.
98 * If your program opens any netdevs, it must call this function within its
103 struct shash_node *node;
104 SHASH_FOR_EACH(node, &netdev_classes) {
105 const struct netdev_class *netdev_class = node->data;
106 if (netdev_class->run) {
112 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
114 * If your program opens any netdevs, it must call this function within its
119 struct shash_node *node;
120 SHASH_FOR_EACH(node, &netdev_classes) {
121 const struct netdev_class *netdev_class = node->data;
122 if (netdev_class->wait) {
123 netdev_class->wait();
128 /* Initializes and registers a new netdev provider. After successful
129 * registration, new netdevs of that type can be opened using netdev_open(). */
131 netdev_register_provider(const struct netdev_class *new_class)
133 if (shash_find(&netdev_classes, new_class->type)) {
134 VLOG_WARN("attempted to register duplicate netdev provider: %s",
139 if (new_class->init) {
140 int error = new_class->init();
142 VLOG_ERR("failed to initialize %s network device class: %s",
143 new_class->type, strerror(error));
148 shash_add(&netdev_classes, new_class->type, new_class);
153 /* Unregisters a netdev provider. 'type' must have been previously
154 * registered and not currently be in use by any netdevs. After unregistration
155 * new netdevs of that type cannot be opened using netdev_open(). */
157 netdev_unregister_provider(const char *type)
159 struct shash_node *del_node, *netdev_node;
161 del_node = shash_find(&netdev_classes, type);
163 VLOG_WARN("attempted to unregister a netdev provider that is not "
164 "registered: %s", type);
168 SHASH_FOR_EACH (netdev_node, &netdev_shash) {
169 struct netdev *netdev = netdev_node->data;
170 if (!strcmp(netdev->netdev_class->type, type)) {
171 VLOG_WARN("attempted to unregister in use netdev provider: %s",
177 shash_delete(&netdev_classes, del_node);
182 const struct netdev_class *
183 netdev_lookup_provider(const char *type)
186 return shash_find_data(&netdev_classes, type && type[0] ? type : "system");
189 /* Clears 'types' and enumerates the types of all currently registered netdev
190 * providers into it. The caller must first initialize the sset. */
192 netdev_enumerate_types(struct sset *types)
194 struct shash_node *node;
199 SHASH_FOR_EACH(node, &netdev_classes) {
200 const struct netdev_class *netdev_class = node->data;
201 sset_add(types, netdev_class->type);
205 /* Opens the network device named 'name' (e.g. "eth0") of the specified 'type'
206 * (e.g. "system") and returns zero if successful, otherwise a positive errno
207 * value. On success, sets '*netdevp' to the new network device, otherwise to
210 * Some network devices may need to be configured (with netdev_set_config())
211 * before they can be used. */
213 netdev_open(const char *name, const char *type, struct netdev **netdevp)
215 struct netdev *netdev;
221 netdev = shash_find_data(&netdev_shash, name);
223 const struct netdev_class *class;
225 class = netdev_lookup_provider(type);
227 VLOG_WARN("could not create netdev %s of unknown type %s",
231 error = class->create(class, name, &netdev);
235 ovs_assert(netdev->netdev_class == class);
244 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
245 * or NULL if none are needed. */
247 netdev_set_config(struct netdev *netdev, const struct smap *args)
249 if (netdev->netdev_class->set_config) {
250 struct smap no_args = SMAP_INITIALIZER(&no_args);
251 return netdev->netdev_class->set_config(netdev,
252 args ? args : &no_args);
253 } else if (args && !smap_is_empty(args)) {
254 VLOG_WARN("%s: arguments provided to device that is not configurable",
255 netdev_get_name(netdev));
261 /* Returns the current configuration for 'netdev' in 'args'. The caller must
262 * have already initialized 'args' with smap_init(). Returns 0 on success, in
263 * which case 'args' will be filled with 'netdev''s configuration. On failure
264 * returns a positive errno value, in which case 'args' will be empty.
266 * The caller owns 'args' and its contents and must eventually free them with
269 netdev_get_config(const struct netdev *netdev, struct smap *args)
274 if (netdev->netdev_class->get_config) {
275 error = netdev->netdev_class->get_config(netdev, args);
286 const struct netdev_tunnel_config *
287 netdev_get_tunnel_config(const struct netdev *netdev)
289 if (netdev->netdev_class->get_tunnel_config) {
290 return netdev->netdev_class->get_tunnel_config(netdev);
297 netdev_unref(struct netdev *dev)
299 ovs_assert(dev->ref_cnt);
300 if (!--dev->ref_cnt) {
301 netdev_uninit(dev, true);
305 /* Closes and destroys 'netdev'. */
307 netdev_close(struct netdev *netdev)
310 netdev_unref(netdev);
314 /* Parses 'netdev_name_', which is of the form [type@]name into its component
315 * pieces. 'name' and 'type' must be freed by the caller. */
317 netdev_parse_name(const char *netdev_name_, char **name, char **type)
319 char *netdev_name = xstrdup(netdev_name_);
322 separator = strchr(netdev_name, '@');
326 *name = xstrdup(separator + 1);
329 *type = xstrdup("system");
334 netdev_rx_open(struct netdev *netdev, struct netdev_rx **rxp)
338 error = (netdev->netdev_class->rx_open
339 ? netdev->netdev_class->rx_open(netdev, rxp)
342 ovs_assert((*rxp)->netdev == netdev);
351 netdev_rx_close(struct netdev_rx *rx)
354 struct netdev *dev = rx->netdev;
356 rx->rx_class->destroy(rx);
362 netdev_rx_recv(struct netdev_rx *rx, struct ofpbuf *buffer)
366 ovs_assert(buffer->size == 0);
367 ovs_assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
369 retval = rx->rx_class->recv(rx, buffer->data, ofpbuf_tailroom(buffer));
371 COVERAGE_INC(netdev_received);
372 buffer->size += retval;
373 if (buffer->size < ETH_TOTAL_MIN) {
374 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
383 netdev_rx_wait(struct netdev_rx *rx)
385 rx->rx_class->wait(rx);
389 netdev_rx_drain(struct netdev_rx *rx)
391 return rx->rx_class->drain ? rx->rx_class->drain(rx) : 0;
394 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
395 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
396 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
397 * the packet is too big or too small to transmit on the device.
399 * The caller retains ownership of 'buffer' in all cases.
401 * The kernel maintains a packet transmission queue, so the caller is not
402 * expected to do additional queuing of packets.
404 * Some network devices may not implement support for this function. In such
405 * cases this function will always return EOPNOTSUPP. */
407 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
411 error = (netdev->netdev_class->send
412 ? netdev->netdev_class->send(netdev, buffer->data, buffer->size)
415 COVERAGE_INC(netdev_sent);
420 /* Registers with the poll loop to wake up from the next call to poll_block()
421 * when the packet transmission queue has sufficient room to transmit a packet
422 * with netdev_send().
424 * The kernel maintains a packet transmission queue, so the client is not
425 * expected to do additional queuing of packets. Thus, this function is
426 * unlikely to ever be used. It is included for completeness. */
428 netdev_send_wait(struct netdev *netdev)
430 if (netdev->netdev_class->send_wait) {
431 netdev->netdev_class->send_wait(netdev);
435 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
436 * otherwise a positive errno value. */
438 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
440 return netdev->netdev_class->set_etheraddr(netdev, mac);
443 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
444 * the MAC address into 'mac'. On failure, returns a positive errno value and
445 * clears 'mac' to all-zeros. */
447 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
449 return netdev->netdev_class->get_etheraddr(netdev, mac);
452 /* Returns the name of the network device that 'netdev' represents,
453 * e.g. "eth0". The caller must not modify or free the returned string. */
455 netdev_get_name(const struct netdev *netdev)
460 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
461 * (and received) packets, in bytes, not including the hardware header; thus,
462 * this is typically 1500 bytes for Ethernet devices.
464 * If successful, returns 0 and stores the MTU size in '*mtup'. Returns
465 * EOPNOTSUPP if 'netdev' does not have an MTU (as e.g. some tunnels do not).
466 * On other failure, returns a positive errno value. On failure, sets '*mtup'
469 netdev_get_mtu(const struct netdev *netdev, int *mtup)
471 const struct netdev_class *class = netdev->netdev_class;
474 error = class->get_mtu ? class->get_mtu(netdev, mtup) : EOPNOTSUPP;
477 if (error != EOPNOTSUPP) {
478 VLOG_DBG_RL(&rl, "failed to retrieve MTU for network device %s: "
479 "%s", netdev_get_name(netdev), strerror(error));
485 /* Sets the MTU of 'netdev'. The MTU is the maximum size of transmitted
486 * (and received) packets, in bytes.
488 * If successful, returns 0. Returns EOPNOTSUPP if 'netdev' does not have an
489 * MTU (as e.g. some tunnels do not). On other failure, returns a positive
492 netdev_set_mtu(const struct netdev *netdev, int mtu)
494 const struct netdev_class *class = netdev->netdev_class;
497 error = class->set_mtu ? class->set_mtu(netdev, mtu) : EOPNOTSUPP;
498 if (error && error != EOPNOTSUPP) {
499 VLOG_DBG_RL(&rl, "failed to set MTU for network device %s: %s",
500 netdev_get_name(netdev), strerror(error));
506 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
507 * failure, returns a negative errno value.
509 * The desired semantics of the ifindex value are a combination of those
510 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
511 * value should be unique within a host and remain stable at least until
512 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
513 * but many systems do not follow this rule anyhow.
515 * Some network devices may not implement support for this function. In such
516 * cases this function will always return -EOPNOTSUPP.
519 netdev_get_ifindex(const struct netdev *netdev)
521 int (*get_ifindex)(const struct netdev *);
523 get_ifindex = netdev->netdev_class->get_ifindex;
525 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
528 /* Stores the features supported by 'netdev' into each of '*current',
529 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
530 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
531 * successful, otherwise a positive errno value. On failure, all of the
532 * passed-in values are set to 0.
534 * Some network devices may not implement support for this function. In such
535 * cases this function will always return EOPNOTSUPP. */
537 netdev_get_features(const struct netdev *netdev,
538 enum netdev_features *current,
539 enum netdev_features *advertised,
540 enum netdev_features *supported,
541 enum netdev_features *peer)
543 int (*get_features)(const struct netdev *netdev,
544 enum netdev_features *current,
545 enum netdev_features *advertised,
546 enum netdev_features *supported,
547 enum netdev_features *peer);
548 enum netdev_features dummy[4];
555 advertised = &dummy[1];
558 supported = &dummy[2];
564 get_features = netdev->netdev_class->get_features;
566 ? get_features(netdev, current, advertised, supported,
570 *current = *advertised = *supported = *peer = 0;
575 /* Returns the maximum speed of a network connection that has the NETDEV_F_*
576 * bits in 'features', in bits per second. If no bits that indicate a speed
577 * are set in 'features', returns 'default_bps'. */
579 netdev_features_to_bps(enum netdev_features features,
580 uint64_t default_bps)
583 F_1000000MB = NETDEV_F_1TB_FD,
584 F_100000MB = NETDEV_F_100GB_FD,
585 F_40000MB = NETDEV_F_40GB_FD,
586 F_10000MB = NETDEV_F_10GB_FD,
587 F_1000MB = NETDEV_F_1GB_HD | NETDEV_F_1GB_FD,
588 F_100MB = NETDEV_F_100MB_HD | NETDEV_F_100MB_FD,
589 F_10MB = NETDEV_F_10MB_HD | NETDEV_F_10MB_FD
592 return ( features & F_1000000MB ? UINT64_C(1000000000000)
593 : features & F_100000MB ? UINT64_C(100000000000)
594 : features & F_40000MB ? UINT64_C(40000000000)
595 : features & F_10000MB ? UINT64_C(10000000000)
596 : features & F_1000MB ? UINT64_C(1000000000)
597 : features & F_100MB ? UINT64_C(100000000)
598 : features & F_10MB ? UINT64_C(10000000)
602 /* Returns true if any of the NETDEV_F_* bits that indicate a full-duplex link
603 * are set in 'features', otherwise false. */
605 netdev_features_is_full_duplex(enum netdev_features features)
607 return (features & (NETDEV_F_10MB_FD | NETDEV_F_100MB_FD | NETDEV_F_1GB_FD
608 | NETDEV_F_10GB_FD | NETDEV_F_40GB_FD
609 | NETDEV_F_100GB_FD | NETDEV_F_1TB_FD)) != 0;
612 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
613 * successful, otherwise a positive errno value. */
615 netdev_set_advertisements(struct netdev *netdev,
616 enum netdev_features advertise)
618 return (netdev->netdev_class->set_advertisements
619 ? netdev->netdev_class->set_advertisements(
624 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
625 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
626 * errno value and sets '*address' to 0 (INADDR_ANY).
628 * The following error values have well-defined meanings:
630 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
632 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
634 * 'address' or 'netmask' or both may be null, in which case the address or
635 * netmask is not reported. */
637 netdev_get_in4(const struct netdev *netdev,
638 struct in_addr *address_, struct in_addr *netmask_)
640 struct in_addr address;
641 struct in_addr netmask;
644 error = (netdev->netdev_class->get_in4
645 ? netdev->netdev_class->get_in4(netdev,
649 address_->s_addr = error ? 0 : address.s_addr;
652 netmask_->s_addr = error ? 0 : netmask.s_addr;
657 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
658 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
659 * positive errno value. */
661 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
663 return (netdev->netdev_class->set_in4
664 ? netdev->netdev_class->set_in4(netdev, addr, mask)
668 /* Obtains ad IPv4 address from device name and save the address in
669 * in4. Returns 0 if successful, otherwise a positive errno value.
672 netdev_get_in4_by_name(const char *device_name, struct in_addr *in4)
674 struct netdev *netdev;
677 error = netdev_open(device_name, "system", &netdev);
679 in4->s_addr = htonl(0);
683 error = netdev_get_in4(netdev, in4, NULL);
684 netdev_close(netdev);
688 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
691 netdev_add_router(struct netdev *netdev, struct in_addr router)
693 COVERAGE_INC(netdev_add_router);
694 return (netdev->netdev_class->add_router
695 ? netdev->netdev_class->add_router(netdev, router)
699 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
700 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
701 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
702 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
703 * a directly connected network) in '*next_hop' and a copy of the name of the
704 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
705 * responsible for freeing '*netdev_name' (by calling free()). */
707 netdev_get_next_hop(const struct netdev *netdev,
708 const struct in_addr *host, struct in_addr *next_hop,
711 int error = (netdev->netdev_class->get_next_hop
712 ? netdev->netdev_class->get_next_hop(
713 host, next_hop, netdev_name)
716 next_hop->s_addr = 0;
722 /* Populates 'smap' with status information.
724 * Populates 'smap' with 'netdev' specific status information. This
725 * information may be used to populate the status column of the Interface table
726 * as defined in ovs-vswitchd.conf.db(5). */
728 netdev_get_status(const struct netdev *netdev, struct smap *smap)
730 return (netdev->netdev_class->get_status
731 ? netdev->netdev_class->get_status(netdev, smap)
735 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
736 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
737 * all-zero-bits (in6addr_any).
739 * The following error values have well-defined meanings:
741 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
743 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
745 * 'in6' may be null, in which case the address itself is not reported. */
747 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
749 struct in6_addr dummy;
752 error = (netdev->netdev_class->get_in6
753 ? netdev->netdev_class->get_in6(netdev,
757 memset(in6, 0, sizeof *in6);
762 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
763 * 'on'. Returns 0 if successful, otherwise a positive errno value. */
765 do_update_flags(struct netdev *netdev, enum netdev_flags off,
766 enum netdev_flags on, enum netdev_flags *old_flagsp,
767 struct netdev_saved_flags **sfp)
769 struct netdev_saved_flags *sf = NULL;
770 enum netdev_flags old_flags;
773 error = netdev->netdev_class->update_flags(netdev, off & ~on, on,
776 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
777 off || on ? "set" : "get", netdev_get_name(netdev),
780 } else if ((off || on) && sfp) {
781 enum netdev_flags new_flags = (old_flags & ~off) | on;
782 enum netdev_flags changed_flags = old_flags ^ new_flags;
784 *sfp = sf = xmalloc(sizeof *sf);
786 list_push_front(&netdev->saved_flags_list, &sf->node);
787 sf->saved_flags = changed_flags;
788 sf->saved_values = changed_flags & new_flags;
795 *old_flagsp = old_flags;
804 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
805 * Returns 0 if successful, otherwise a positive errno value. On failure,
806 * stores 0 into '*flagsp'. */
808 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
810 struct netdev *netdev = CONST_CAST(struct netdev *, netdev_);
811 return do_update_flags(netdev, 0, 0, flagsp, NULL);
814 /* Sets the flags for 'netdev' to 'flags'.
815 * Returns 0 if successful, otherwise a positive errno value. */
817 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
818 struct netdev_saved_flags **sfp)
820 return do_update_flags(netdev, -1, flags, NULL, sfp);
823 /* Turns on the specified 'flags' on 'netdev':
825 * - On success, returns 0. If 'sfp' is nonnull, sets '*sfp' to a newly
826 * allocated 'struct netdev_saved_flags *' that may be passed to
827 * netdev_restore_flags() to restore the original values of 'flags' on
828 * 'netdev' (this will happen automatically at program termination if
829 * netdev_restore_flags() is never called) , or to NULL if no flags were
832 * - On failure, returns a positive errno value. If 'sfp' is nonnull, sets
835 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
836 struct netdev_saved_flags **sfp)
838 return do_update_flags(netdev, 0, flags, NULL, sfp);
841 /* Turns off the specified 'flags' on 'netdev'. See netdev_turn_flags_on() for
842 * details of the interface. */
844 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
845 struct netdev_saved_flags **sfp)
847 return do_update_flags(netdev, flags, 0, NULL, sfp);
850 /* Restores the flags that were saved in 'sf', and destroys 'sf'.
851 * Does nothing if 'sf' is NULL. */
853 netdev_restore_flags(struct netdev_saved_flags *sf)
856 struct netdev *netdev = sf->netdev;
857 enum netdev_flags old_flags;
859 netdev->netdev_class->update_flags(netdev,
860 sf->saved_flags & sf->saved_values,
861 sf->saved_flags & ~sf->saved_values,
863 list_remove(&sf->node);
866 netdev_unref(netdev);
870 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
871 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
872 * returns 0. Otherwise, it returns a positive errno value; in particular,
873 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
875 netdev_arp_lookup(const struct netdev *netdev,
876 ovs_be32 ip, uint8_t mac[ETH_ADDR_LEN])
878 int error = (netdev->netdev_class->arp_lookup
879 ? netdev->netdev_class->arp_lookup(netdev,
883 memset(mac, 0, ETH_ADDR_LEN);
888 /* Returns true if carrier is active (link light is on) on 'netdev'. */
890 netdev_get_carrier(const struct netdev *netdev)
893 enum netdev_flags flags;
896 netdev_get_flags(netdev, &flags);
897 if (!(flags & NETDEV_UP)) {
901 if (!netdev->netdev_class->get_carrier) {
905 error = netdev->netdev_class->get_carrier(netdev,
908 VLOG_DBG("%s: failed to get network device carrier status, assuming "
909 "down: %s", netdev_get_name(netdev), strerror(error));
916 /* Returns the number of times 'netdev''s carrier has changed. */
918 netdev_get_carrier_resets(const struct netdev *netdev)
920 return (netdev->netdev_class->get_carrier_resets
921 ? netdev->netdev_class->get_carrier_resets(netdev)
925 /* Attempts to force netdev_get_carrier() to poll 'netdev''s MII registers for
926 * link status instead of checking 'netdev''s carrier. 'netdev''s MII
927 * registers will be polled once ever 'interval' milliseconds. If 'netdev'
928 * does not support MII, another method may be used as a fallback. If
929 * 'interval' is less than or equal to zero, reverts netdev_get_carrier() to
930 * its normal behavior.
932 * Returns 0 if successful, otherwise a positive errno value. */
934 netdev_set_miimon_interval(struct netdev *netdev, long long int interval)
936 return (netdev->netdev_class->set_miimon_interval
937 ? netdev->netdev_class->set_miimon_interval(netdev, interval)
941 /* Retrieves current device stats for 'netdev'. */
943 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
947 COVERAGE_INC(netdev_get_stats);
948 error = (netdev->netdev_class->get_stats
949 ? netdev->netdev_class->get_stats(netdev, stats)
952 memset(stats, 0xff, sizeof *stats);
957 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
958 * Returns 0 if successful, otherwise a positive errno value.
960 * This will probably fail for most network devices. Some devices might only
961 * allow setting their stats to 0. */
963 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
965 return (netdev->netdev_class->set_stats
966 ? netdev->netdev_class->set_stats(netdev, stats)
970 /* Attempts to set input rate limiting (policing) policy, such that up to
971 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
972 * size of 'kbits' kb. */
974 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
975 uint32_t kbits_burst)
977 return (netdev->netdev_class->set_policing
978 ? netdev->netdev_class->set_policing(netdev,
979 kbits_rate, kbits_burst)
983 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
984 * empty if 'netdev' does not support QoS. Any names added to 'types' should
985 * be documented as valid for the "type" column in the "QoS" table in
986 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
988 * Every network device supports disabling QoS with a type of "", but this type
989 * will not be added to 'types'.
991 * The caller must initialize 'types' (e.g. with sset_init()) before calling
992 * this function. The caller is responsible for destroying 'types' (e.g. with
993 * sset_destroy()) when it is no longer needed.
995 * Returns 0 if successful, otherwise a positive errno value. */
997 netdev_get_qos_types(const struct netdev *netdev, struct sset *types)
999 const struct netdev_class *class = netdev->netdev_class;
1000 return (class->get_qos_types
1001 ? class->get_qos_types(netdev, types)
1005 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
1006 * which should be "" or one of the types returned by netdev_get_qos_types()
1007 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
1008 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
1009 * 'caps' to all zeros. */
1011 netdev_get_qos_capabilities(const struct netdev *netdev, const char *type,
1012 struct netdev_qos_capabilities *caps)
1014 const struct netdev_class *class = netdev->netdev_class;
1017 int retval = (class->get_qos_capabilities
1018 ? class->get_qos_capabilities(netdev, type, caps)
1021 memset(caps, 0, sizeof *caps);
1025 /* Every netdev supports turning off QoS. */
1026 memset(caps, 0, sizeof *caps);
1031 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1032 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1033 * the number of queues (zero on failure) in '*n_queuesp'.
1035 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1037 netdev_get_n_queues(const struct netdev *netdev,
1038 const char *type, unsigned int *n_queuesp)
1040 struct netdev_qos_capabilities caps;
1043 retval = netdev_get_qos_capabilities(netdev, type, &caps);
1044 *n_queuesp = caps.n_queues;
1048 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1049 * stores the name of the current form of QoS into '*typep', stores any details
1050 * of configuration as string key-value pairs in 'details', and returns 0. On
1051 * failure, sets '*typep' to NULL and returns a positive errno value.
1053 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1055 * The caller must initialize 'details' as an empty smap (e.g. with
1056 * smap_init()) before calling this function. The caller must free 'details'
1057 * when it is no longer needed (e.g. with smap_destroy()).
1059 * The caller must not modify or free '*typep'.
1061 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1062 * 'netdev'. The contents of 'details' should be documented as valid for
1063 * '*typep' in the "other_config" column in the "QoS" table in
1064 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1066 netdev_get_qos(const struct netdev *netdev,
1067 const char **typep, struct smap *details)
1069 const struct netdev_class *class = netdev->netdev_class;
1072 if (class->get_qos) {
1073 retval = class->get_qos(netdev, typep, details);
1076 smap_clear(details);
1080 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1086 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1087 * with details of configuration from 'details'. Returns 0 if successful,
1088 * otherwise a positive errno value. On error, the previous QoS configuration
1091 * When this function changes the type of QoS (not just 'details'), this also
1092 * resets all queue configuration for 'netdev' to their defaults (which depend
1093 * on the specific type of QoS). Otherwise, the queue configuration for
1094 * 'netdev' is unchanged.
1096 * 'type' should be "" (to disable QoS) or one of the types returned by
1097 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1098 * documented as valid for the given 'type' in the "other_config" column in the
1099 * "QoS" table in vswitchd/vswitch.xml (which is built as
1100 * ovs-vswitchd.conf.db(8)).
1102 * NULL may be specified for 'details' if there are no configuration
1105 netdev_set_qos(struct netdev *netdev,
1106 const char *type, const struct smap *details)
1108 const struct netdev_class *class = netdev->netdev_class;
1114 if (class->set_qos) {
1116 static const struct smap empty = SMAP_INITIALIZER(&empty);
1119 return class->set_qos(netdev, type, details);
1121 return *type ? EOPNOTSUPP : 0;
1125 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1126 * successful, adds that information as string key-value pairs to 'details'.
1127 * Returns 0 if successful, otherwise a positive errno value.
1129 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1130 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1132 * The returned contents of 'details' should be documented as valid for the
1133 * given 'type' in the "other_config" column in the "Queue" table in
1134 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1136 * The caller must initialize 'details' (e.g. with smap_init()) before calling
1137 * this function. The caller must free 'details' when it is no longer needed
1138 * (e.g. with smap_destroy()). */
1140 netdev_get_queue(const struct netdev *netdev,
1141 unsigned int queue_id, struct smap *details)
1143 const struct netdev_class *class = netdev->netdev_class;
1146 retval = (class->get_queue
1147 ? class->get_queue(netdev, queue_id, details)
1150 smap_clear(details);
1155 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1156 * string pairs in 'details'. The contents of 'details' should be documented
1157 * as valid for the given 'type' in the "other_config" column in the "Queue"
1158 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1159 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1160 * given queue's configuration should be unmodified.
1162 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1163 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1165 * This function does not modify 'details', and the caller retains ownership of
1168 netdev_set_queue(struct netdev *netdev,
1169 unsigned int queue_id, const struct smap *details)
1171 const struct netdev_class *class = netdev->netdev_class;
1172 return (class->set_queue
1173 ? class->set_queue(netdev, queue_id, details)
1177 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1178 * of QoS may have a fixed set of queues, in which case attempts to delete them
1179 * will fail with EOPNOTSUPP.
1181 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1182 * given queue will be unmodified.
1184 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1185 * the current form of QoS (e.g. as returned by
1186 * netdev_get_n_queues(netdev)). */
1188 netdev_delete_queue(struct netdev *netdev, unsigned int queue_id)
1190 const struct netdev_class *class = netdev->netdev_class;
1191 return (class->delete_queue
1192 ? class->delete_queue(netdev, queue_id)
1196 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1197 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1198 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1199 * positive errno value and fills 'stats' with all-1-bits. */
1201 netdev_get_queue_stats(const struct netdev *netdev, unsigned int queue_id,
1202 struct netdev_queue_stats *stats)
1204 const struct netdev_class *class = netdev->netdev_class;
1207 retval = (class->get_queue_stats
1208 ? class->get_queue_stats(netdev, queue_id, stats)
1211 memset(stats, 0xff, sizeof *stats);
1216 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1217 * its configuration, and the 'aux' specified by the caller. The order of
1218 * iteration is unspecified, but (when successful) each queue is visited
1221 * Calling this function may be more efficient than calling netdev_get_queue()
1224 * 'cb' must not modify or free the 'details' argument passed in. It may
1225 * delete or modify the queue passed in as its 'queue_id' argument. It may
1226 * modify but must not delete any other queue within 'netdev'. 'cb' should not
1227 * add new queues because this may cause some queues to be visited twice or not
1230 * Returns 0 if successful, otherwise a positive errno value. On error, some
1231 * configured queues may not have been included in the iteration. */
1233 netdev_dump_queues(const struct netdev *netdev,
1234 netdev_dump_queues_cb *cb, void *aux)
1236 const struct netdev_class *class = netdev->netdev_class;
1237 return (class->dump_queues
1238 ? class->dump_queues(netdev, cb, aux)
1242 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1243 * its statistics, and the 'aux' specified by the caller. The order of
1244 * iteration is unspecified, but (when successful) each queue is visited
1247 * Calling this function may be more efficient than calling
1248 * netdev_get_queue_stats() for every queue.
1250 * 'cb' must not modify or free the statistics passed in.
1252 * Returns 0 if successful, otherwise a positive errno value. On error, some
1253 * configured queues may not have been included in the iteration. */
1255 netdev_dump_queue_stats(const struct netdev *netdev,
1256 netdev_dump_queue_stats_cb *cb, void *aux)
1258 const struct netdev_class *class = netdev->netdev_class;
1259 return (class->dump_queue_stats
1260 ? class->dump_queue_stats(netdev, cb, aux)
1264 /* Returns a sequence number which indicates changes in one of 'netdev''s
1265 * properties. The returned sequence will be nonzero so that callers have a
1266 * value which they may use as a reset when tracking 'netdev'.
1268 * The returned sequence number will change whenever 'netdev''s flags,
1269 * features, ethernet address, or carrier changes. It may change for other
1270 * reasons as well, or no reason at all. */
1272 netdev_change_seq(const struct netdev *netdev)
1274 return netdev->netdev_class->change_seq(netdev);
1277 /* Initializes 'netdev' as a netdev device named 'name' of the specified
1278 * 'netdev_class'. This function is ordinarily called from a netdev provider's
1279 * 'create' function.
1281 * This function adds 'netdev' to a netdev-owned shash, so it is very important
1282 * that 'netdev' only be freed after calling netdev_uninit(). */
1284 netdev_init(struct netdev *netdev, const char *name,
1285 const struct netdev_class *netdev_class)
1287 ovs_assert(!shash_find(&netdev_shash, name));
1289 memset(netdev, 0, sizeof *netdev);
1290 netdev->netdev_class = netdev_class;
1291 netdev->name = xstrdup(name);
1292 netdev->node = shash_add(&netdev_shash, name, netdev);
1293 list_init(&netdev->saved_flags_list);
1296 /* Undoes the results of initialization.
1298 * Normally this function does not need to be called as netdev_close has
1299 * the same effect when the refcount drops to zero.
1300 * However, it may be called by providers due to an error on creation
1301 * that occurs after initialization. It this case netdev_close() would
1302 * never be called. */
1304 netdev_uninit(struct netdev *netdev, bool destroy)
1306 char *name = netdev->name;
1308 ovs_assert(!netdev->ref_cnt);
1309 ovs_assert(list_is_empty(&netdev->saved_flags_list));
1311 shash_delete(&netdev_shash, netdev->node);
1314 netdev->netdev_class->destroy(netdev);
1319 /* Returns the class type of 'netdev'.
1321 * The caller must not free the returned value. */
1323 netdev_get_type(const struct netdev *netdev)
1325 return netdev->netdev_class->type;
1328 /* Returns the class associated with 'netdev'. */
1329 const struct netdev_class *
1330 netdev_get_class(const struct netdev *netdev)
1332 return netdev->netdev_class;
1335 /* Returns the netdev with 'name' or NULL if there is none.
1337 * The caller must not free the returned value. */
1339 netdev_from_name(const char *name)
1341 return shash_find_data(&netdev_shash, name);
1344 /* Fills 'device_list' with devices that match 'netdev_class'.
1346 * The caller is responsible for initializing and destroying 'device_list'
1347 * but the contained netdevs must not be freed. */
1349 netdev_get_devices(const struct netdev_class *netdev_class,
1350 struct shash *device_list)
1352 struct shash_node *node;
1353 SHASH_FOR_EACH (node, &netdev_shash) {
1354 struct netdev *dev = node->data;
1356 if (dev->netdev_class == netdev_class) {
1357 shash_add(device_list, node->name, node->data);
1363 netdev_get_type_from_name(const char *name)
1365 const struct netdev *dev = netdev_from_name(name);
1366 return dev ? netdev_get_type(dev) : NULL;
1370 netdev_rx_init(struct netdev_rx *rx, struct netdev *netdev,
1371 const struct netdev_rx_class *class)
1373 ovs_assert(netdev->ref_cnt > 0);
1374 rx->rx_class = class;
1375 rx->netdev = netdev;
1379 netdev_rx_uninit(struct netdev_rx *rx OVS_UNUSED)
1381 /* Nothing to do. */
1385 netdev_rx_get_netdev(const struct netdev_rx *rx)
1387 ovs_assert(rx->netdev->ref_cnt > 0);
1392 netdev_rx_get_name(const struct netdev_rx *rx)
1394 return netdev_get_name(netdev_rx_get_netdev(rx));
1398 restore_all_flags(void *aux OVS_UNUSED)
1400 struct shash_node *node;
1402 SHASH_FOR_EACH (node, &netdev_shash) {
1403 struct netdev *netdev = node->data;
1404 const struct netdev_saved_flags *sf;
1405 enum netdev_flags saved_values;
1406 enum netdev_flags saved_flags;
1408 saved_values = saved_flags = 0;
1409 LIST_FOR_EACH (sf, node, &netdev->saved_flags_list) {
1410 saved_flags |= sf->saved_flags;
1411 saved_values &= ~sf->saved_flags;
1412 saved_values |= sf->saved_flags & sf->saved_values;
1415 enum netdev_flags old_flags;
1417 netdev->netdev_class->update_flags(netdev,
1418 saved_flags & saved_values,
1419 saved_flags & ~saved_values,