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_dev *dev;
53 struct list node; /* In struct netdev_dev'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_dev_shash = SHASH_INITIALIZER(&netdev_dev_shash);
63 /* All open network devices. */
64 static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
66 /* This is set pretty low because we probably won't learn anything from the
67 * additional log messages. */
68 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
70 static void restore_all_flags(void *aux OVS_UNUSED);
71 void update_device_args(struct netdev_dev *, const struct shash *args);
74 netdev_initialize(void)
81 fatal_signal_add_hook(restore_all_flags, NULL, NULL, true);
82 netdev_vport_patch_register();
85 netdev_register_provider(&netdev_linux_class);
86 netdev_register_provider(&netdev_internal_class);
87 netdev_register_provider(&netdev_tap_class);
88 netdev_vport_tunnel_register();
91 netdev_register_provider(&netdev_tap_class);
92 netdev_register_provider(&netdev_bsd_class);
97 /* Performs periodic work needed by all the various kinds of netdevs.
99 * If your program opens any netdevs, it must call this function within its
104 struct shash_node *node;
105 SHASH_FOR_EACH(node, &netdev_classes) {
106 const struct netdev_class *netdev_class = node->data;
107 if (netdev_class->run) {
113 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
115 * If your program opens any netdevs, it must call this function within its
120 struct shash_node *node;
121 SHASH_FOR_EACH(node, &netdev_classes) {
122 const struct netdev_class *netdev_class = node->data;
123 if (netdev_class->wait) {
124 netdev_class->wait();
129 /* Initializes and registers a new netdev provider. After successful
130 * registration, new netdevs of that type can be opened using netdev_open(). */
132 netdev_register_provider(const struct netdev_class *new_class)
134 if (shash_find(&netdev_classes, new_class->type)) {
135 VLOG_WARN("attempted to register duplicate netdev provider: %s",
140 if (new_class->init) {
141 int error = new_class->init();
143 VLOG_ERR("failed to initialize %s network device class: %s",
144 new_class->type, strerror(error));
149 shash_add(&netdev_classes, new_class->type, new_class);
154 /* Unregisters a netdev provider. 'type' must have been previously
155 * registered and not currently be in use by any netdevs. After unregistration
156 * new netdevs of that type cannot be opened using netdev_open(). */
158 netdev_unregister_provider(const char *type)
160 struct shash_node *del_node, *netdev_dev_node;
162 del_node = shash_find(&netdev_classes, type);
164 VLOG_WARN("attempted to unregister a netdev provider that is not "
165 "registered: %s", type);
169 SHASH_FOR_EACH(netdev_dev_node, &netdev_dev_shash) {
170 struct netdev_dev *netdev_dev = netdev_dev_node->data;
171 if (!strcmp(netdev_dev->netdev_class->type, type)) {
172 VLOG_WARN("attempted to unregister in use netdev provider: %s",
178 shash_delete(&netdev_classes, del_node);
183 const struct netdev_class *
184 netdev_lookup_provider(const char *type)
187 return shash_find_data(&netdev_classes, type && type[0] ? type : "system");
190 /* Clears 'types' and enumerates the types of all currently registered netdev
191 * providers into it. The caller must first initialize the sset. */
193 netdev_enumerate_types(struct sset *types)
195 struct shash_node *node;
200 SHASH_FOR_EACH(node, &netdev_classes) {
201 const struct netdev_class *netdev_class = node->data;
202 sset_add(types, netdev_class->type);
206 /* Opens the network device named 'name' (e.g. "eth0") of the specified 'type'
207 * (e.g. "system") and returns zero if successful, otherwise a positive errno
208 * value. On success, sets '*netdevp' to the new network device, otherwise to
211 * Some network devices may need to be configured (with netdev_set_config())
212 * before they can be used. */
214 netdev_open(const char *name, const char *type, struct netdev **netdevp)
216 struct netdev_dev *netdev_dev;
222 netdev_dev = shash_find_data(&netdev_dev_shash, name);
225 const struct netdev_class *class;
227 class = netdev_lookup_provider(type);
229 VLOG_WARN("could not create netdev %s of unknown type %s",
233 error = class->create(class, name, &netdev_dev);
237 ovs_assert(netdev_dev->netdev_class == class);
241 error = netdev_dev->netdev_class->open(netdev_dev, netdevp);
244 netdev_dev->ref_cnt++;
246 if (!netdev_dev->ref_cnt) {
247 netdev_dev_uninit(netdev_dev, true);
254 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
255 * or NULL if none are needed. */
257 netdev_set_config(struct netdev *netdev, const struct smap *args)
259 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
261 if (netdev_dev->netdev_class->set_config) {
262 struct smap no_args = SMAP_INITIALIZER(&no_args);
263 return netdev_dev->netdev_class->set_config(netdev_dev,
264 args ? args : &no_args);
265 } else if (args && !smap_is_empty(args)) {
266 VLOG_WARN("%s: arguments provided to device that is not configurable",
267 netdev_get_name(netdev));
273 /* Returns the current configuration for 'netdev' in 'args'. The caller must
274 * have already initialized 'args' with smap_init(). Returns 0 on success, in
275 * which case 'args' will be filled with 'netdev''s configuration. On failure
276 * returns a positive errno value, in which case 'args' will be empty.
278 * The caller owns 'args' and its contents and must eventually free them with
281 netdev_get_config(const struct netdev *netdev, struct smap *args)
283 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
287 if (netdev_dev->netdev_class->get_config) {
288 error = netdev_dev->netdev_class->get_config(netdev_dev, args);
299 const struct netdev_tunnel_config *
300 netdev_get_tunnel_config(const struct netdev *netdev)
302 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
304 if (netdev_dev->netdev_class->get_tunnel_config) {
305 return netdev_dev->netdev_class->get_tunnel_config(netdev_dev);
312 netdev_dev_unref(struct netdev_dev *dev)
314 ovs_assert(dev->ref_cnt);
315 if (!--dev->ref_cnt) {
316 netdev_dev_uninit(dev, true);
320 /* Closes and destroys 'netdev'. */
322 netdev_close(struct netdev *netdev)
325 struct netdev_dev *dev = netdev_get_dev(netdev);
327 netdev_uninit(netdev, true);
328 netdev_dev_unref(dev);
332 /* Parses 'netdev_name_', which is of the form [type@]name into its component
333 * pieces. 'name' and 'type' must be freed by the caller. */
335 netdev_parse_name(const char *netdev_name_, char **name, char **type)
337 char *netdev_name = xstrdup(netdev_name_);
340 separator = strchr(netdev_name, '@');
344 *name = xstrdup(separator + 1);
347 *type = xstrdup("system");
351 /* Attempts to set up 'netdev' for receiving packets with netdev_recv().
352 * Returns 0 if successful, otherwise a positive errno value. EOPNOTSUPP
353 * indicates that the network device does not implement packet reception
354 * through this interface. */
356 netdev_listen(struct netdev *netdev)
358 int (*listen)(struct netdev *);
360 listen = netdev_get_dev(netdev)->netdev_class->listen;
361 return listen ? (listen)(netdev) : EOPNOTSUPP;
364 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
365 * must have initialized with sufficient room for the packet. The space
366 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
367 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
368 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
369 * need not be included.)
371 * This function can only be expected to return a packet if ->listen() has
372 * been called successfully.
374 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
375 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
376 * positive errno value. Returns EAGAIN immediately if no packet is ready to
379 * Some network devices may not implement support for this function. In such
380 * cases this function will always return EOPNOTSUPP. */
382 netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
384 int (*recv)(struct netdev *, void *, size_t);
387 ovs_assert(buffer->size == 0);
388 ovs_assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
390 recv = netdev_get_dev(netdev)->netdev_class->recv;
392 ? (recv)(netdev, buffer->data, ofpbuf_tailroom(buffer))
395 COVERAGE_INC(netdev_received);
396 buffer->size += retval;
397 if (buffer->size < ETH_TOTAL_MIN) {
398 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
406 /* Registers with the poll loop to wake up from the next call to poll_block()
407 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
409 netdev_recv_wait(struct netdev *netdev)
411 void (*recv_wait)(struct netdev *);
413 recv_wait = netdev_get_dev(netdev)->netdev_class->recv_wait;
419 /* Discards all packets waiting to be received from 'netdev'. */
421 netdev_drain(struct netdev *netdev)
423 int (*drain)(struct netdev *);
425 drain = netdev_get_dev(netdev)->netdev_class->drain;
426 return drain ? drain(netdev) : 0;
429 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
430 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
431 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
432 * the packet is too big or too small to transmit on the device.
434 * The caller retains ownership of 'buffer' in all cases.
436 * The kernel maintains a packet transmission queue, so the caller is not
437 * expected to do additional queuing of packets.
439 * Some network devices may not implement support for this function. In such
440 * cases this function will always return EOPNOTSUPP. */
442 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
444 int (*send)(struct netdev *, const void *, size_t);
447 send = netdev_get_dev(netdev)->netdev_class->send;
448 error = send ? (send)(netdev, buffer->data, buffer->size) : EOPNOTSUPP;
450 COVERAGE_INC(netdev_sent);
455 /* Registers with the poll loop to wake up from the next call to poll_block()
456 * when the packet transmission queue has sufficient room to transmit a packet
457 * with netdev_send().
459 * The kernel maintains a packet transmission queue, so the client is not
460 * expected to do additional queuing of packets. Thus, this function is
461 * unlikely to ever be used. It is included for completeness. */
463 netdev_send_wait(struct netdev *netdev)
465 void (*send_wait)(struct netdev *);
467 send_wait = netdev_get_dev(netdev)->netdev_class->send_wait;
473 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
474 * otherwise a positive errno value. */
476 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
478 return netdev_get_dev(netdev)->netdev_class->set_etheraddr(netdev, mac);
481 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
482 * the MAC address into 'mac'. On failure, returns a positive errno value and
483 * clears 'mac' to all-zeros. */
485 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
487 return netdev_get_dev(netdev)->netdev_class->get_etheraddr(netdev, mac);
490 /* Returns the name of the network device that 'netdev' represents,
491 * e.g. "eth0". The caller must not modify or free the returned string. */
493 netdev_get_name(const struct netdev *netdev)
495 return netdev_get_dev(netdev)->name;
498 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
499 * (and received) packets, in bytes, not including the hardware header; thus,
500 * this is typically 1500 bytes for Ethernet devices.
502 * If successful, returns 0 and stores the MTU size in '*mtup'. Returns
503 * EOPNOTSUPP if 'netdev' does not have an MTU (as e.g. some tunnels do not).
504 * On other failure, returns a positive errno value. On failure, sets '*mtup'
507 netdev_get_mtu(const struct netdev *netdev, int *mtup)
509 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
512 error = class->get_mtu ? class->get_mtu(netdev, mtup) : EOPNOTSUPP;
515 if (error != EOPNOTSUPP) {
516 VLOG_DBG_RL(&rl, "failed to retrieve MTU for network device %s: "
517 "%s", netdev_get_name(netdev), strerror(error));
523 /* Sets the MTU of 'netdev'. The MTU is the maximum size of transmitted
524 * (and received) packets, in bytes.
526 * If successful, returns 0. Returns EOPNOTSUPP if 'netdev' does not have an
527 * MTU (as e.g. some tunnels do not). On other failure, returns a positive
530 netdev_set_mtu(const struct netdev *netdev, int mtu)
532 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
535 error = class->set_mtu ? class->set_mtu(netdev, mtu) : EOPNOTSUPP;
536 if (error && error != EOPNOTSUPP) {
537 VLOG_DBG_RL(&rl, "failed to set MTU for network device %s: %s",
538 netdev_get_name(netdev), strerror(error));
544 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
545 * failure, returns a negative errno value.
547 * The desired semantics of the ifindex value are a combination of those
548 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
549 * value should be unique within a host and remain stable at least until
550 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
551 * but many systems do not follow this rule anyhow.
553 * Some network devices may not implement support for this function. In such
554 * cases this function will always return -EOPNOTSUPP.
557 netdev_get_ifindex(const struct netdev *netdev)
559 int (*get_ifindex)(const struct netdev *);
561 get_ifindex = netdev_get_dev(netdev)->netdev_class->get_ifindex;
563 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
566 /* Stores the features supported by 'netdev' into each of '*current',
567 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
568 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
569 * successful, otherwise a positive errno value. On failure, all of the
570 * passed-in values are set to 0.
572 * Some network devices may not implement support for this function. In such
573 * cases this function will always return EOPNOTSUPP. */
575 netdev_get_features(const struct netdev *netdev,
576 enum netdev_features *current,
577 enum netdev_features *advertised,
578 enum netdev_features *supported,
579 enum netdev_features *peer)
581 int (*get_features)(const struct netdev *netdev,
582 enum netdev_features *current,
583 enum netdev_features *advertised,
584 enum netdev_features *supported,
585 enum netdev_features *peer);
586 enum netdev_features dummy[4];
593 advertised = &dummy[1];
596 supported = &dummy[2];
602 get_features = netdev_get_dev(netdev)->netdev_class->get_features;
604 ? get_features(netdev, current, advertised, supported,
608 *current = *advertised = *supported = *peer = 0;
613 /* Returns the maximum speed of a network connection that has the NETDEV_F_*
614 * bits in 'features', in bits per second. If no bits that indicate a speed
615 * are set in 'features', returns 'default_bps'. */
617 netdev_features_to_bps(enum netdev_features features,
618 uint64_t default_bps)
621 F_1000000MB = NETDEV_F_1TB_FD,
622 F_100000MB = NETDEV_F_100GB_FD,
623 F_40000MB = NETDEV_F_40GB_FD,
624 F_10000MB = NETDEV_F_10GB_FD,
625 F_1000MB = NETDEV_F_1GB_HD | NETDEV_F_1GB_FD,
626 F_100MB = NETDEV_F_100MB_HD | NETDEV_F_100MB_FD,
627 F_10MB = NETDEV_F_10MB_HD | NETDEV_F_10MB_FD
630 return ( features & F_1000000MB ? UINT64_C(1000000000000)
631 : features & F_100000MB ? UINT64_C(100000000000)
632 : features & F_40000MB ? UINT64_C(40000000000)
633 : features & F_10000MB ? UINT64_C(10000000000)
634 : features & F_1000MB ? UINT64_C(1000000000)
635 : features & F_100MB ? UINT64_C(100000000)
636 : features & F_10MB ? UINT64_C(10000000)
640 /* Returns true if any of the NETDEV_F_* bits that indicate a full-duplex link
641 * are set in 'features', otherwise false. */
643 netdev_features_is_full_duplex(enum netdev_features features)
645 return (features & (NETDEV_F_10MB_FD | NETDEV_F_100MB_FD | NETDEV_F_1GB_FD
646 | NETDEV_F_10GB_FD | NETDEV_F_40GB_FD
647 | NETDEV_F_100GB_FD | NETDEV_F_1TB_FD)) != 0;
650 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
651 * successful, otherwise a positive errno value. */
653 netdev_set_advertisements(struct netdev *netdev,
654 enum netdev_features advertise)
656 return (netdev_get_dev(netdev)->netdev_class->set_advertisements
657 ? netdev_get_dev(netdev)->netdev_class->set_advertisements(
662 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
663 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
664 * errno value and sets '*address' to 0 (INADDR_ANY).
666 * The following error values have well-defined meanings:
668 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
670 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
672 * 'address' or 'netmask' or both may be null, in which case the address or
673 * netmask is not reported. */
675 netdev_get_in4(const struct netdev *netdev,
676 struct in_addr *address_, struct in_addr *netmask_)
678 struct in_addr address;
679 struct in_addr netmask;
682 error = (netdev_get_dev(netdev)->netdev_class->get_in4
683 ? netdev_get_dev(netdev)->netdev_class->get_in4(netdev,
687 address_->s_addr = error ? 0 : address.s_addr;
690 netmask_->s_addr = error ? 0 : netmask.s_addr;
695 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
696 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
697 * positive errno value. */
699 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
701 return (netdev_get_dev(netdev)->netdev_class->set_in4
702 ? netdev_get_dev(netdev)->netdev_class->set_in4(netdev, addr, mask)
706 /* Obtains ad IPv4 address from device name and save the address in
707 * in4. Returns 0 if successful, otherwise a positive errno value.
710 netdev_get_in4_by_name(const char *device_name, struct in_addr *in4)
712 struct netdev *netdev;
715 error = netdev_open(device_name, "system", &netdev);
717 in4->s_addr = htonl(0);
721 error = netdev_get_in4(netdev, in4, NULL);
722 netdev_close(netdev);
726 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
729 netdev_add_router(struct netdev *netdev, struct in_addr router)
731 COVERAGE_INC(netdev_add_router);
732 return (netdev_get_dev(netdev)->netdev_class->add_router
733 ? netdev_get_dev(netdev)->netdev_class->add_router(netdev, router)
737 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
738 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
739 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
740 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
741 * a directly connected network) in '*next_hop' and a copy of the name of the
742 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
743 * responsible for freeing '*netdev_name' (by calling free()). */
745 netdev_get_next_hop(const struct netdev *netdev,
746 const struct in_addr *host, struct in_addr *next_hop,
749 int error = (netdev_get_dev(netdev)->netdev_class->get_next_hop
750 ? netdev_get_dev(netdev)->netdev_class->get_next_hop(
751 host, next_hop, netdev_name)
754 next_hop->s_addr = 0;
760 /* Populates 'smap' with status information.
762 * Populates 'smap' with 'netdev' specific status information. This
763 * information may be used to populate the status column of the Interface table
764 * as defined in ovs-vswitchd.conf.db(5). */
766 netdev_get_status(const struct netdev *netdev, struct smap *smap)
768 struct netdev_dev *dev = netdev_get_dev(netdev);
770 return (dev->netdev_class->get_status
771 ? dev->netdev_class->get_status(netdev, smap)
775 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
776 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
777 * all-zero-bits (in6addr_any).
779 * The following error values have well-defined meanings:
781 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
783 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
785 * 'in6' may be null, in which case the address itself is not reported. */
787 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
789 struct in6_addr dummy;
792 error = (netdev_get_dev(netdev)->netdev_class->get_in6
793 ? netdev_get_dev(netdev)->netdev_class->get_in6(netdev,
797 memset(in6, 0, sizeof *in6);
802 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
803 * 'on'. Returns 0 if successful, otherwise a positive errno value. */
805 do_update_flags(struct netdev *netdev, enum netdev_flags off,
806 enum netdev_flags on, enum netdev_flags *old_flagsp,
807 struct netdev_saved_flags **sfp)
809 struct netdev_dev *dev = netdev_get_dev(netdev);
810 struct netdev_saved_flags *sf = NULL;
811 enum netdev_flags old_flags;
814 error = dev->netdev_class->update_flags(dev, off & ~on, on, &old_flags);
816 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
817 off || on ? "set" : "get", netdev_get_name(netdev),
820 } else if ((off || on) && sfp) {
821 enum netdev_flags new_flags = (old_flags & ~off) | on;
822 enum netdev_flags changed_flags = old_flags ^ new_flags;
824 *sfp = sf = xmalloc(sizeof *sf);
826 list_push_front(&dev->saved_flags_list, &sf->node);
827 sf->saved_flags = changed_flags;
828 sf->saved_values = changed_flags & new_flags;
835 *old_flagsp = old_flags;
844 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
845 * Returns 0 if successful, otherwise a positive errno value. On failure,
846 * stores 0 into '*flagsp'. */
848 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
850 struct netdev *netdev = CONST_CAST(struct netdev *, netdev_);
851 return do_update_flags(netdev, 0, 0, flagsp, NULL);
854 /* Sets the flags for 'netdev' to 'flags'.
855 * Returns 0 if successful, otherwise a positive errno value. */
857 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
858 struct netdev_saved_flags **sfp)
860 return do_update_flags(netdev, -1, flags, NULL, sfp);
863 /* Turns on the specified 'flags' on 'netdev':
865 * - On success, returns 0. If 'sfp' is nonnull, sets '*sfp' to a newly
866 * allocated 'struct netdev_saved_flags *' that may be passed to
867 * netdev_restore_flags() to restore the original values of 'flags' on
868 * 'netdev' (this will happen automatically at program termination if
869 * netdev_restore_flags() is never called) , or to NULL if no flags were
872 * - On failure, returns a positive errno value. If 'sfp' is nonnull, sets
875 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
876 struct netdev_saved_flags **sfp)
878 return do_update_flags(netdev, 0, flags, NULL, sfp);
881 /* Turns off the specified 'flags' on 'netdev'. See netdev_turn_flags_on() for
882 * details of the interface. */
884 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
885 struct netdev_saved_flags **sfp)
887 return do_update_flags(netdev, flags, 0, NULL, sfp);
890 /* Restores the flags that were saved in 'sf', and destroys 'sf'.
891 * Does nothing if 'sf' is NULL. */
893 netdev_restore_flags(struct netdev_saved_flags *sf)
896 struct netdev_dev *dev = sf->dev;
897 enum netdev_flags old_flags;
899 dev->netdev_class->update_flags(dev,
900 sf->saved_flags & sf->saved_values,
901 sf->saved_flags & ~sf->saved_values,
903 list_remove(&sf->node);
906 netdev_dev_unref(dev);
910 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
911 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
912 * returns 0. Otherwise, it returns a positive errno value; in particular,
913 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
915 netdev_arp_lookup(const struct netdev *netdev,
916 ovs_be32 ip, uint8_t mac[ETH_ADDR_LEN])
918 int error = (netdev_get_dev(netdev)->netdev_class->arp_lookup
919 ? netdev_get_dev(netdev)->netdev_class->arp_lookup(netdev,
923 memset(mac, 0, ETH_ADDR_LEN);
928 /* Returns true if carrier is active (link light is on) on 'netdev'. */
930 netdev_get_carrier(const struct netdev *netdev)
933 enum netdev_flags flags;
936 netdev_get_flags(netdev, &flags);
937 if (!(flags & NETDEV_UP)) {
941 if (!netdev_get_dev(netdev)->netdev_class->get_carrier) {
945 error = netdev_get_dev(netdev)->netdev_class->get_carrier(netdev,
948 VLOG_DBG("%s: failed to get network device carrier status, assuming "
949 "down: %s", netdev_get_name(netdev), strerror(error));
956 /* Returns the number of times 'netdev''s carrier has changed. */
958 netdev_get_carrier_resets(const struct netdev *netdev)
960 return (netdev_get_dev(netdev)->netdev_class->get_carrier_resets
961 ? netdev_get_dev(netdev)->netdev_class->get_carrier_resets(netdev)
965 /* Attempts to force netdev_get_carrier() to poll 'netdev''s MII registers for
966 * link status instead of checking 'netdev''s carrier. 'netdev''s MII
967 * registers will be polled once ever 'interval' milliseconds. If 'netdev'
968 * does not support MII, another method may be used as a fallback. If
969 * 'interval' is less than or equal to zero, reverts netdev_get_carrier() to
970 * its normal behavior.
972 * Returns 0 if successful, otherwise a positive errno value. */
974 netdev_set_miimon_interval(struct netdev *netdev, long long int interval)
976 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
977 return (netdev_dev->netdev_class->set_miimon_interval
978 ? netdev_dev->netdev_class->set_miimon_interval(netdev, interval)
982 /* Retrieves current device stats for 'netdev'. */
984 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
988 COVERAGE_INC(netdev_get_stats);
989 error = (netdev_get_dev(netdev)->netdev_class->get_stats
990 ? netdev_get_dev(netdev)->netdev_class->get_stats(netdev, stats)
993 memset(stats, 0xff, sizeof *stats);
998 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
999 * Returns 0 if successful, otherwise a positive errno value.
1001 * This will probably fail for most network devices. Some devices might only
1002 * allow setting their stats to 0. */
1004 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
1006 return (netdev_get_dev(netdev)->netdev_class->set_stats
1007 ? netdev_get_dev(netdev)->netdev_class->set_stats(netdev, stats)
1011 /* Attempts to set input rate limiting (policing) policy, such that up to
1012 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
1013 * size of 'kbits' kb. */
1015 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
1016 uint32_t kbits_burst)
1018 return (netdev_get_dev(netdev)->netdev_class->set_policing
1019 ? netdev_get_dev(netdev)->netdev_class->set_policing(netdev,
1020 kbits_rate, kbits_burst)
1024 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
1025 * empty if 'netdev' does not support QoS. Any names added to 'types' should
1026 * be documented as valid for the "type" column in the "QoS" table in
1027 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1029 * Every network device supports disabling QoS with a type of "", but this type
1030 * will not be added to 'types'.
1032 * The caller must initialize 'types' (e.g. with sset_init()) before calling
1033 * this function. The caller is responsible for destroying 'types' (e.g. with
1034 * sset_destroy()) when it is no longer needed.
1036 * Returns 0 if successful, otherwise a positive errno value. */
1038 netdev_get_qos_types(const struct netdev *netdev, struct sset *types)
1040 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1041 return (class->get_qos_types
1042 ? class->get_qos_types(netdev, types)
1046 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
1047 * which should be "" or one of the types returned by netdev_get_qos_types()
1048 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
1049 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
1050 * 'caps' to all zeros. */
1052 netdev_get_qos_capabilities(const struct netdev *netdev, const char *type,
1053 struct netdev_qos_capabilities *caps)
1055 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1058 int retval = (class->get_qos_capabilities
1059 ? class->get_qos_capabilities(netdev, type, caps)
1062 memset(caps, 0, sizeof *caps);
1066 /* Every netdev supports turning off QoS. */
1067 memset(caps, 0, sizeof *caps);
1072 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1073 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1074 * the number of queues (zero on failure) in '*n_queuesp'.
1076 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1078 netdev_get_n_queues(const struct netdev *netdev,
1079 const char *type, unsigned int *n_queuesp)
1081 struct netdev_qos_capabilities caps;
1084 retval = netdev_get_qos_capabilities(netdev, type, &caps);
1085 *n_queuesp = caps.n_queues;
1089 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1090 * stores the name of the current form of QoS into '*typep', stores any details
1091 * of configuration as string key-value pairs in 'details', and returns 0. On
1092 * failure, sets '*typep' to NULL and returns a positive errno value.
1094 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1096 * The caller must initialize 'details' as an empty smap (e.g. with
1097 * smap_init()) before calling this function. The caller must free 'details'
1098 * when it is no longer needed (e.g. with smap_destroy()).
1100 * The caller must not modify or free '*typep'.
1102 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1103 * 'netdev'. The contents of 'details' should be documented as valid for
1104 * '*typep' in the "other_config" column in the "QoS" table in
1105 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1107 netdev_get_qos(const struct netdev *netdev,
1108 const char **typep, struct smap *details)
1110 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1113 if (class->get_qos) {
1114 retval = class->get_qos(netdev, typep, details);
1117 smap_clear(details);
1121 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1127 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1128 * with details of configuration from 'details'. Returns 0 if successful,
1129 * otherwise a positive errno value. On error, the previous QoS configuration
1132 * When this function changes the type of QoS (not just 'details'), this also
1133 * resets all queue configuration for 'netdev' to their defaults (which depend
1134 * on the specific type of QoS). Otherwise, the queue configuration for
1135 * 'netdev' is unchanged.
1137 * 'type' should be "" (to disable QoS) or one of the types returned by
1138 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1139 * documented as valid for the given 'type' in the "other_config" column in the
1140 * "QoS" table in vswitchd/vswitch.xml (which is built as
1141 * ovs-vswitchd.conf.db(8)).
1143 * NULL may be specified for 'details' if there are no configuration
1146 netdev_set_qos(struct netdev *netdev,
1147 const char *type, const struct smap *details)
1149 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1155 if (class->set_qos) {
1157 static const struct smap empty = SMAP_INITIALIZER(&empty);
1160 return class->set_qos(netdev, type, details);
1162 return *type ? EOPNOTSUPP : 0;
1166 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1167 * successful, adds that information as string key-value pairs to 'details'.
1168 * Returns 0 if successful, otherwise a positive errno value.
1170 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1171 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1173 * The returned contents of 'details' should be documented as valid for the
1174 * given 'type' in the "other_config" column in the "Queue" table in
1175 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1177 * The caller must initialize 'details' (e.g. with smap_init()) before calling
1178 * this function. The caller must free 'details' when it is no longer needed
1179 * (e.g. with smap_destroy()). */
1181 netdev_get_queue(const struct netdev *netdev,
1182 unsigned int queue_id, struct smap *details)
1184 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1187 retval = (class->get_queue
1188 ? class->get_queue(netdev, queue_id, details)
1191 smap_clear(details);
1196 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1197 * string pairs in 'details'. The contents of 'details' should be documented
1198 * as valid for the given 'type' in the "other_config" column in the "Queue"
1199 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1200 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1201 * given queue's configuration should be unmodified.
1203 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1204 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1206 * This function does not modify 'details', and the caller retains ownership of
1209 netdev_set_queue(struct netdev *netdev,
1210 unsigned int queue_id, const struct smap *details)
1212 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1213 return (class->set_queue
1214 ? class->set_queue(netdev, queue_id, details)
1218 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1219 * of QoS may have a fixed set of queues, in which case attempts to delete them
1220 * will fail with EOPNOTSUPP.
1222 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1223 * given queue will be unmodified.
1225 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1226 * the current form of QoS (e.g. as returned by
1227 * netdev_get_n_queues(netdev)). */
1229 netdev_delete_queue(struct netdev *netdev, unsigned int queue_id)
1231 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1232 return (class->delete_queue
1233 ? class->delete_queue(netdev, queue_id)
1237 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1238 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1239 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1240 * positive errno value and fills 'stats' with all-1-bits. */
1242 netdev_get_queue_stats(const struct netdev *netdev, unsigned int queue_id,
1243 struct netdev_queue_stats *stats)
1245 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1248 retval = (class->get_queue_stats
1249 ? class->get_queue_stats(netdev, queue_id, stats)
1252 memset(stats, 0xff, sizeof *stats);
1257 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1258 * its configuration, and the 'aux' specified by the caller. The order of
1259 * iteration is unspecified, but (when successful) each queue is visited
1262 * Calling this function may be more efficient than calling netdev_get_queue()
1265 * 'cb' must not modify or free the 'details' argument passed in. It may
1266 * delete or modify the queue passed in as its 'queue_id' argument. It may
1267 * modify but must not delete any other queue within 'netdev'. 'cb' should not
1268 * add new queues because this may cause some queues to be visited twice or not
1271 * Returns 0 if successful, otherwise a positive errno value. On error, some
1272 * configured queues may not have been included in the iteration. */
1274 netdev_dump_queues(const struct netdev *netdev,
1275 netdev_dump_queues_cb *cb, void *aux)
1277 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1278 return (class->dump_queues
1279 ? class->dump_queues(netdev, cb, aux)
1283 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1284 * its statistics, and the 'aux' specified by the caller. The order of
1285 * iteration is unspecified, but (when successful) each queue is visited
1288 * Calling this function may be more efficient than calling
1289 * netdev_get_queue_stats() for every queue.
1291 * 'cb' must not modify or free the statistics passed in.
1293 * Returns 0 if successful, otherwise a positive errno value. On error, some
1294 * configured queues may not have been included in the iteration. */
1296 netdev_dump_queue_stats(const struct netdev *netdev,
1297 netdev_dump_queue_stats_cb *cb, void *aux)
1299 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1300 return (class->dump_queue_stats
1301 ? class->dump_queue_stats(netdev, cb, aux)
1305 /* Returns a sequence number which indicates changes in one of 'netdev''s
1306 * properties. The returned sequence will be nonzero so that callers have a
1307 * value which they may use as a reset when tracking 'netdev'.
1309 * The returned sequence number will change whenever 'netdev''s flags,
1310 * features, ethernet address, or carrier changes. It may change for other
1311 * reasons as well, or no reason at all. */
1313 netdev_change_seq(const struct netdev *netdev)
1315 return netdev_get_dev(netdev)->netdev_class->change_seq(netdev);
1318 /* Initializes 'netdev_dev' as a netdev device named 'name' of the specified
1319 * 'netdev_class'. This function is ordinarily called from a netdev provider's
1320 * 'create' function.
1322 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1323 * very important that 'netdev_dev' only be freed after calling
1324 * the refcount drops to zero. */
1326 netdev_dev_init(struct netdev_dev *netdev_dev, const char *name,
1327 const struct netdev_class *netdev_class)
1329 ovs_assert(!shash_find(&netdev_dev_shash, name));
1331 memset(netdev_dev, 0, sizeof *netdev_dev);
1332 netdev_dev->netdev_class = netdev_class;
1333 netdev_dev->name = xstrdup(name);
1334 netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev);
1335 list_init(&netdev_dev->saved_flags_list);
1338 /* Undoes the results of initialization.
1340 * Normally this function does not need to be called as netdev_close has
1341 * the same effect when the refcount drops to zero.
1342 * However, it may be called by providers due to an error on creation
1343 * that occurs after initialization. It this case netdev_close() would
1344 * never be called. */
1346 netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy)
1348 char *name = netdev_dev->name;
1350 ovs_assert(!netdev_dev->ref_cnt);
1351 ovs_assert(list_is_empty(&netdev_dev->saved_flags_list));
1353 shash_delete(&netdev_dev_shash, netdev_dev->node);
1356 netdev_dev->netdev_class->destroy(netdev_dev);
1361 /* Returns the class type of 'netdev_dev'.
1363 * The caller must not free the returned value. */
1365 netdev_dev_get_type(const struct netdev_dev *netdev_dev)
1367 return netdev_dev->netdev_class->type;
1370 /* Returns the class associated with 'netdev_dev'. */
1371 const struct netdev_class *
1372 netdev_dev_get_class(const struct netdev_dev *netdev_dev)
1374 return netdev_dev->netdev_class;
1377 /* Returns the name of 'netdev_dev'.
1379 * The caller must not free the returned value. */
1381 netdev_dev_get_name(const struct netdev_dev *netdev_dev)
1383 return netdev_dev->name;
1386 /* Returns the netdev_dev with 'name' or NULL if there is none.
1388 * The caller must not free the returned value. */
1390 netdev_dev_from_name(const char *name)
1392 return shash_find_data(&netdev_dev_shash, name);
1395 /* Fills 'device_list' with devices that match 'netdev_class'.
1397 * The caller is responsible for initializing and destroying 'device_list'
1398 * but the contained netdev_devs must not be freed. */
1400 netdev_dev_get_devices(const struct netdev_class *netdev_class,
1401 struct shash *device_list)
1403 struct shash_node *node;
1404 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1405 struct netdev_dev *dev = node->data;
1407 if (dev->netdev_class == netdev_class) {
1408 shash_add(device_list, node->name, node->data);
1413 /* Initializes 'netdev' as a instance of the netdev_dev.
1415 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1416 * important that 'netdev' only be freed after calling netdev_close(). */
1418 netdev_init(struct netdev *netdev, struct netdev_dev *netdev_dev)
1420 memset(netdev, 0, sizeof *netdev);
1421 netdev->netdev_dev = netdev_dev;
1422 list_push_back(&netdev_list, &netdev->node);
1425 /* Undoes the results of initialization.
1427 * Normally this function only needs to be called from netdev_close().
1428 * However, it may be called by providers due to an error on opening
1429 * that occurs after initialization. It this case netdev_close() would
1430 * never be called. */
1432 netdev_uninit(struct netdev *netdev, bool close)
1434 list_remove(&netdev->node);
1436 netdev_get_dev(netdev)->netdev_class->close(netdev);
1440 /* Returns the class type of 'netdev'.
1442 * The caller must not free the returned value. */
1444 netdev_get_type(const struct netdev *netdev)
1446 return netdev_get_dev(netdev)->netdev_class->type;
1450 netdev_get_type_from_name(const char *name)
1452 const struct netdev_dev *dev = netdev_dev_from_name(name);
1453 return dev ? netdev_dev_get_type(dev) : NULL;
1457 netdev_get_dev(const struct netdev *netdev)
1459 return netdev->netdev_dev;
1462 /* Restores all flags that have been saved with netdev_save_flags() and not yet
1463 * restored with netdev_restore_flags(). */
1465 restore_all_flags(void *aux OVS_UNUSED)
1467 struct shash_node *node;
1469 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1470 struct netdev_dev *dev = node->data;
1471 const struct netdev_saved_flags *sf;
1472 enum netdev_flags saved_values;
1473 enum netdev_flags saved_flags;
1475 saved_values = saved_flags = 0;
1476 LIST_FOR_EACH (sf, node, &dev->saved_flags_list) {
1477 saved_flags |= sf->saved_flags;
1478 saved_values &= ~sf->saved_flags;
1479 saved_values |= sf->saved_flags & sf->saved_values;
1482 enum netdev_flags old_flags;
1484 dev->netdev_class->update_flags(dev,
1485 saved_flags & saved_values,
1486 saved_flags & ~saved_values,