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);
94 netdev_register_provider(&netdev_tunnel_class);
95 netdev_register_provider(&netdev_pltap_class);
99 /* Performs periodic work needed by all the various kinds of netdevs.
101 * If your program opens any netdevs, it must call this function within its
106 struct shash_node *node;
107 SHASH_FOR_EACH(node, &netdev_classes) {
108 const struct netdev_class *netdev_class = node->data;
109 if (netdev_class->run) {
115 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
117 * If your program opens any netdevs, it must call this function within its
122 struct shash_node *node;
123 SHASH_FOR_EACH(node, &netdev_classes) {
124 const struct netdev_class *netdev_class = node->data;
125 if (netdev_class->wait) {
126 netdev_class->wait();
131 /* Initializes and registers a new netdev provider. After successful
132 * registration, new netdevs of that type can be opened using netdev_open(). */
134 netdev_register_provider(const struct netdev_class *new_class)
136 if (shash_find(&netdev_classes, new_class->type)) {
137 VLOG_WARN("attempted to register duplicate netdev provider: %s",
142 if (new_class->init) {
143 int error = new_class->init();
145 VLOG_ERR("failed to initialize %s network device class: %s",
146 new_class->type, strerror(error));
151 shash_add(&netdev_classes, new_class->type, new_class);
156 /* Unregisters a netdev provider. 'type' must have been previously
157 * registered and not currently be in use by any netdevs. After unregistration
158 * new netdevs of that type cannot be opened using netdev_open(). */
160 netdev_unregister_provider(const char *type)
162 struct shash_node *del_node, *netdev_dev_node;
164 del_node = shash_find(&netdev_classes, type);
166 VLOG_WARN("attempted to unregister a netdev provider that is not "
167 "registered: %s", type);
171 SHASH_FOR_EACH(netdev_dev_node, &netdev_dev_shash) {
172 struct netdev_dev *netdev_dev = netdev_dev_node->data;
173 if (!strcmp(netdev_dev->netdev_class->type, type)) {
174 VLOG_WARN("attempted to unregister in use netdev provider: %s",
180 shash_delete(&netdev_classes, del_node);
185 const struct netdev_class *
186 netdev_lookup_provider(const char *type)
189 return shash_find_data(&netdev_classes, type && type[0] ? type : "system");
192 /* Clears 'types' and enumerates the types of all currently registered netdev
193 * providers into it. The caller must first initialize the sset. */
195 netdev_enumerate_types(struct sset *types)
197 struct shash_node *node;
202 SHASH_FOR_EACH(node, &netdev_classes) {
203 const struct netdev_class *netdev_class = node->data;
204 sset_add(types, netdev_class->type);
208 /* Opens the network device named 'name' (e.g. "eth0") of the specified 'type'
209 * (e.g. "system") and returns zero if successful, otherwise a positive errno
210 * value. On success, sets '*netdevp' to the new network device, otherwise to
213 * Some network devices may need to be configured (with netdev_set_config())
214 * before they can be used. */
216 netdev_open(const char *name, const char *type, struct netdev **netdevp)
218 struct netdev_dev *netdev_dev;
224 netdev_dev = shash_find_data(&netdev_dev_shash, name);
227 const struct netdev_class *class;
229 class = netdev_lookup_provider(type);
231 VLOG_WARN("could not create netdev %s of unknown type %s",
235 error = class->create(class, name, &netdev_dev);
239 ovs_assert(netdev_dev->netdev_class == class);
243 error = netdev_dev->netdev_class->open(netdev_dev, netdevp);
246 netdev_dev->ref_cnt++;
248 if (!netdev_dev->ref_cnt) {
249 netdev_dev_uninit(netdev_dev, true);
256 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
257 * or NULL if none are needed. */
259 netdev_set_config(struct netdev *netdev, const struct smap *args)
261 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
263 if (netdev_dev->netdev_class->set_config) {
264 struct smap no_args = SMAP_INITIALIZER(&no_args);
265 return netdev_dev->netdev_class->set_config(netdev_dev,
266 args ? args : &no_args);
267 } else if (args && !smap_is_empty(args)) {
268 VLOG_WARN("%s: arguments provided to device that is not configurable",
269 netdev_get_name(netdev));
275 /* Returns the current configuration for 'netdev' in 'args'. The caller must
276 * have already initialized 'args' with smap_init(). Returns 0 on success, in
277 * which case 'args' will be filled with 'netdev''s configuration. On failure
278 * returns a positive errno value, in which case 'args' will be empty.
280 * The caller owns 'args' and its contents and must eventually free them with
283 netdev_get_config(const struct netdev *netdev, struct smap *args)
285 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
289 if (netdev_dev->netdev_class->get_config) {
290 error = netdev_dev->netdev_class->get_config(netdev_dev, args);
301 const struct netdev_tunnel_config *
302 netdev_get_tunnel_config(const struct netdev *netdev)
304 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
306 if (netdev_dev->netdev_class->get_tunnel_config) {
307 return netdev_dev->netdev_class->get_tunnel_config(netdev_dev);
314 netdev_dev_unref(struct netdev_dev *dev)
316 ovs_assert(dev->ref_cnt);
317 if (!--dev->ref_cnt) {
318 netdev_dev_uninit(dev, true);
322 /* Closes and destroys 'netdev'. */
324 netdev_close(struct netdev *netdev)
327 struct netdev_dev *dev = netdev_get_dev(netdev);
329 netdev_uninit(netdev, true);
330 netdev_dev_unref(dev);
334 /* Parses 'netdev_name_', which is of the form [type@]name into its component
335 * pieces. 'name' and 'type' must be freed by the caller. */
337 netdev_parse_name(const char *netdev_name_, char **name, char **type)
339 char *netdev_name = xstrdup(netdev_name_);
342 separator = strchr(netdev_name, '@');
346 *name = xstrdup(separator + 1);
349 *type = xstrdup("system");
353 /* Attempts to set up 'netdev' for receiving packets with netdev_recv().
354 * Returns 0 if successful, otherwise a positive errno value. EOPNOTSUPP
355 * indicates that the network device does not implement packet reception
356 * through this interface. */
358 netdev_listen(struct netdev *netdev)
360 int (*listen)(struct netdev *);
362 listen = netdev_get_dev(netdev)->netdev_class->listen;
363 return listen ? (listen)(netdev) : EOPNOTSUPP;
366 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
367 * must have initialized with sufficient room for the packet. The space
368 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
369 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
370 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
371 * need not be included.)
373 * This function can only be expected to return a packet if ->listen() has
374 * been called successfully.
376 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
377 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
378 * positive errno value. Returns EAGAIN immediately if no packet is ready to
381 * Some network devices may not implement support for this function. In such
382 * cases this function will always return EOPNOTSUPP. */
384 netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
386 int (*recv)(struct netdev *, void *, size_t);
389 ovs_assert(buffer->size == 0);
390 ovs_assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
392 recv = netdev_get_dev(netdev)->netdev_class->recv;
394 ? (recv)(netdev, buffer->data, ofpbuf_tailroom(buffer))
397 COVERAGE_INC(netdev_received);
398 buffer->size += retval;
399 if (buffer->size < ETH_TOTAL_MIN) {
400 ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
408 /* Registers with the poll loop to wake up from the next call to poll_block()
409 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
411 netdev_recv_wait(struct netdev *netdev)
413 void (*recv_wait)(struct netdev *);
415 recv_wait = netdev_get_dev(netdev)->netdev_class->recv_wait;
421 /* Discards all packets waiting to be received from 'netdev'. */
423 netdev_drain(struct netdev *netdev)
425 int (*drain)(struct netdev *);
427 drain = netdev_get_dev(netdev)->netdev_class->drain;
428 return drain ? drain(netdev) : 0;
431 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
432 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
433 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
434 * the packet is too big or too small to transmit on the device.
436 * The caller retains ownership of 'buffer' in all cases.
438 * The kernel maintains a packet transmission queue, so the caller is not
439 * expected to do additional queuing of packets.
441 * Some network devices may not implement support for this function. In such
442 * cases this function will always return EOPNOTSUPP. */
444 netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
446 int (*send)(struct netdev *, const void *, size_t);
449 send = netdev_get_dev(netdev)->netdev_class->send;
450 error = send ? (send)(netdev, buffer->data, buffer->size) : EOPNOTSUPP;
452 COVERAGE_INC(netdev_sent);
457 /* Registers with the poll loop to wake up from the next call to poll_block()
458 * when the packet transmission queue has sufficient room to transmit a packet
459 * with netdev_send().
461 * The kernel maintains a packet transmission queue, so the client is not
462 * expected to do additional queuing of packets. Thus, this function is
463 * unlikely to ever be used. It is included for completeness. */
465 netdev_send_wait(struct netdev *netdev)
467 void (*send_wait)(struct netdev *);
469 send_wait = netdev_get_dev(netdev)->netdev_class->send_wait;
475 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
476 * otherwise a positive errno value. */
478 netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
480 return netdev_get_dev(netdev)->netdev_class->set_etheraddr(netdev, mac);
483 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
484 * the MAC address into 'mac'. On failure, returns a positive errno value and
485 * clears 'mac' to all-zeros. */
487 netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
489 return netdev_get_dev(netdev)->netdev_class->get_etheraddr(netdev, mac);
492 /* Returns the name of the network device that 'netdev' represents,
493 * e.g. "eth0". The caller must not modify or free the returned string. */
495 netdev_get_name(const struct netdev *netdev)
497 return netdev_get_dev(netdev)->name;
500 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
501 * (and received) packets, in bytes, not including the hardware header; thus,
502 * this is typically 1500 bytes for Ethernet devices.
504 * If successful, returns 0 and stores the MTU size in '*mtup'. Returns
505 * EOPNOTSUPP if 'netdev' does not have an MTU (as e.g. some tunnels do not).
506 * On other failure, returns a positive errno value. On failure, sets '*mtup'
509 netdev_get_mtu(const struct netdev *netdev, int *mtup)
511 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
514 error = class->get_mtu ? class->get_mtu(netdev, mtup) : EOPNOTSUPP;
517 if (error != EOPNOTSUPP) {
518 VLOG_DBG_RL(&rl, "failed to retrieve MTU for network device %s: "
519 "%s", netdev_get_name(netdev), strerror(error));
525 /* Sets the MTU of 'netdev'. The MTU is the maximum size of transmitted
526 * (and received) packets, in bytes.
528 * If successful, returns 0. Returns EOPNOTSUPP if 'netdev' does not have an
529 * MTU (as e.g. some tunnels do not). On other failure, returns a positive
532 netdev_set_mtu(const struct netdev *netdev, int mtu)
534 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
537 error = class->set_mtu ? class->set_mtu(netdev, mtu) : EOPNOTSUPP;
538 if (error && error != EOPNOTSUPP) {
539 VLOG_DBG_RL(&rl, "failed to set MTU for network device %s: %s",
540 netdev_get_name(netdev), strerror(error));
546 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
547 * failure, returns a negative errno value.
549 * The desired semantics of the ifindex value are a combination of those
550 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
551 * value should be unique within a host and remain stable at least until
552 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
553 * but many systems do not follow this rule anyhow.
555 * Some network devices may not implement support for this function. In such
556 * cases this function will always return -EOPNOTSUPP.
559 netdev_get_ifindex(const struct netdev *netdev)
561 int (*get_ifindex)(const struct netdev *);
563 get_ifindex = netdev_get_dev(netdev)->netdev_class->get_ifindex;
565 return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
568 /* Stores the features supported by 'netdev' into each of '*current',
569 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
570 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
571 * successful, otherwise a positive errno value. On failure, all of the
572 * passed-in values are set to 0.
574 * Some network devices may not implement support for this function. In such
575 * cases this function will always return EOPNOTSUPP. */
577 netdev_get_features(const struct netdev *netdev,
578 enum netdev_features *current,
579 enum netdev_features *advertised,
580 enum netdev_features *supported,
581 enum netdev_features *peer)
583 int (*get_features)(const struct netdev *netdev,
584 enum netdev_features *current,
585 enum netdev_features *advertised,
586 enum netdev_features *supported,
587 enum netdev_features *peer);
588 enum netdev_features dummy[4];
595 advertised = &dummy[1];
598 supported = &dummy[2];
604 get_features = netdev_get_dev(netdev)->netdev_class->get_features;
606 ? get_features(netdev, current, advertised, supported,
610 *current = *advertised = *supported = *peer = 0;
615 /* Returns the maximum speed of a network connection that has the NETDEV_F_*
616 * bits in 'features', in bits per second. If no bits that indicate a speed
617 * are set in 'features', returns 'default_bps'. */
619 netdev_features_to_bps(enum netdev_features features,
620 uint64_t default_bps)
623 F_1000000MB = NETDEV_F_1TB_FD,
624 F_100000MB = NETDEV_F_100GB_FD,
625 F_40000MB = NETDEV_F_40GB_FD,
626 F_10000MB = NETDEV_F_10GB_FD,
627 F_1000MB = NETDEV_F_1GB_HD | NETDEV_F_1GB_FD,
628 F_100MB = NETDEV_F_100MB_HD | NETDEV_F_100MB_FD,
629 F_10MB = NETDEV_F_10MB_HD | NETDEV_F_10MB_FD
632 return ( features & F_1000000MB ? UINT64_C(1000000000000)
633 : features & F_100000MB ? UINT64_C(100000000000)
634 : features & F_40000MB ? UINT64_C(40000000000)
635 : features & F_10000MB ? UINT64_C(10000000000)
636 : features & F_1000MB ? UINT64_C(1000000000)
637 : features & F_100MB ? UINT64_C(100000000)
638 : features & F_10MB ? UINT64_C(10000000)
642 /* Returns true if any of the NETDEV_F_* bits that indicate a full-duplex link
643 * are set in 'features', otherwise false. */
645 netdev_features_is_full_duplex(enum netdev_features features)
647 return (features & (NETDEV_F_10MB_FD | NETDEV_F_100MB_FD | NETDEV_F_1GB_FD
648 | NETDEV_F_10GB_FD | NETDEV_F_40GB_FD
649 | NETDEV_F_100GB_FD | NETDEV_F_1TB_FD)) != 0;
652 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
653 * successful, otherwise a positive errno value. */
655 netdev_set_advertisements(struct netdev *netdev,
656 enum netdev_features advertise)
658 return (netdev_get_dev(netdev)->netdev_class->set_advertisements
659 ? netdev_get_dev(netdev)->netdev_class->set_advertisements(
664 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
665 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
666 * errno value and sets '*address' to 0 (INADDR_ANY).
668 * The following error values have well-defined meanings:
670 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
672 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
674 * 'address' or 'netmask' or both may be null, in which case the address or
675 * netmask is not reported. */
677 netdev_get_in4(const struct netdev *netdev,
678 struct in_addr *address_, struct in_addr *netmask_)
680 struct in_addr address;
681 struct in_addr netmask;
684 error = (netdev_get_dev(netdev)->netdev_class->get_in4
685 ? netdev_get_dev(netdev)->netdev_class->get_in4(netdev,
689 address_->s_addr = error ? 0 : address.s_addr;
692 netmask_->s_addr = error ? 0 : netmask.s_addr;
697 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
698 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
699 * positive errno value. */
701 netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
703 return (netdev_get_dev(netdev)->netdev_class->set_in4
704 ? netdev_get_dev(netdev)->netdev_class->set_in4(netdev, addr, mask)
708 /* Obtains ad IPv4 address from device name and save the address in
709 * in4. Returns 0 if successful, otherwise a positive errno value.
712 netdev_get_in4_by_name(const char *device_name, struct in_addr *in4)
714 struct netdev *netdev;
717 error = netdev_open(device_name, "system", &netdev);
719 in4->s_addr = htonl(0);
723 error = netdev_get_in4(netdev, in4, NULL);
724 netdev_close(netdev);
728 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
731 netdev_add_router(struct netdev *netdev, struct in_addr router)
733 COVERAGE_INC(netdev_add_router);
734 return (netdev_get_dev(netdev)->netdev_class->add_router
735 ? netdev_get_dev(netdev)->netdev_class->add_router(netdev, router)
739 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
740 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
741 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
742 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
743 * a directly connected network) in '*next_hop' and a copy of the name of the
744 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
745 * responsible for freeing '*netdev_name' (by calling free()). */
747 netdev_get_next_hop(const struct netdev *netdev,
748 const struct in_addr *host, struct in_addr *next_hop,
751 int error = (netdev_get_dev(netdev)->netdev_class->get_next_hop
752 ? netdev_get_dev(netdev)->netdev_class->get_next_hop(
753 host, next_hop, netdev_name)
756 next_hop->s_addr = 0;
762 /* Populates 'smap' with status information.
764 * Populates 'smap' with 'netdev' specific status information. This
765 * information may be used to populate the status column of the Interface table
766 * as defined in ovs-vswitchd.conf.db(5). */
768 netdev_get_status(const struct netdev *netdev, struct smap *smap)
770 struct netdev_dev *dev = netdev_get_dev(netdev);
772 return (dev->netdev_class->get_status
773 ? dev->netdev_class->get_status(netdev, smap)
777 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
778 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
779 * all-zero-bits (in6addr_any).
781 * The following error values have well-defined meanings:
783 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
785 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
787 * 'in6' may be null, in which case the address itself is not reported. */
789 netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
791 struct in6_addr dummy;
794 error = (netdev_get_dev(netdev)->netdev_class->get_in6
795 ? netdev_get_dev(netdev)->netdev_class->get_in6(netdev,
799 memset(in6, 0, sizeof *in6);
804 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
805 * 'on'. Returns 0 if successful, otherwise a positive errno value. */
807 do_update_flags(struct netdev *netdev, enum netdev_flags off,
808 enum netdev_flags on, enum netdev_flags *old_flagsp,
809 struct netdev_saved_flags **sfp)
811 struct netdev_dev *dev = netdev_get_dev(netdev);
812 struct netdev_saved_flags *sf = NULL;
813 enum netdev_flags old_flags;
816 error = dev->netdev_class->update_flags(dev, off & ~on, on, &old_flags);
818 VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
819 off || on ? "set" : "get", netdev_get_name(netdev),
822 } else if ((off || on) && sfp) {
823 enum netdev_flags new_flags = (old_flags & ~off) | on;
824 enum netdev_flags changed_flags = old_flags ^ new_flags;
826 *sfp = sf = xmalloc(sizeof *sf);
828 list_push_front(&dev->saved_flags_list, &sf->node);
829 sf->saved_flags = changed_flags;
830 sf->saved_values = changed_flags & new_flags;
837 *old_flagsp = old_flags;
846 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
847 * Returns 0 if successful, otherwise a positive errno value. On failure,
848 * stores 0 into '*flagsp'. */
850 netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
852 struct netdev *netdev = CONST_CAST(struct netdev *, netdev_);
853 return do_update_flags(netdev, 0, 0, flagsp, NULL);
856 /* Sets the flags for 'netdev' to 'flags'.
857 * Returns 0 if successful, otherwise a positive errno value. */
859 netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
860 struct netdev_saved_flags **sfp)
862 return do_update_flags(netdev, -1, flags, NULL, sfp);
865 /* Turns on the specified 'flags' on 'netdev':
867 * - On success, returns 0. If 'sfp' is nonnull, sets '*sfp' to a newly
868 * allocated 'struct netdev_saved_flags *' that may be passed to
869 * netdev_restore_flags() to restore the original values of 'flags' on
870 * 'netdev' (this will happen automatically at program termination if
871 * netdev_restore_flags() is never called) , or to NULL if no flags were
874 * - On failure, returns a positive errno value. If 'sfp' is nonnull, sets
877 netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
878 struct netdev_saved_flags **sfp)
880 return do_update_flags(netdev, 0, flags, NULL, sfp);
883 /* Turns off the specified 'flags' on 'netdev'. See netdev_turn_flags_on() for
884 * details of the interface. */
886 netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
887 struct netdev_saved_flags **sfp)
889 return do_update_flags(netdev, flags, 0, NULL, sfp);
892 /* Restores the flags that were saved in 'sf', and destroys 'sf'.
893 * Does nothing if 'sf' is NULL. */
895 netdev_restore_flags(struct netdev_saved_flags *sf)
898 struct netdev_dev *dev = sf->dev;
899 enum netdev_flags old_flags;
901 dev->netdev_class->update_flags(dev,
902 sf->saved_flags & sf->saved_values,
903 sf->saved_flags & ~sf->saved_values,
905 list_remove(&sf->node);
908 netdev_dev_unref(dev);
912 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
913 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
914 * returns 0. Otherwise, it returns a positive errno value; in particular,
915 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
917 netdev_arp_lookup(const struct netdev *netdev,
918 ovs_be32 ip, uint8_t mac[ETH_ADDR_LEN])
920 int error = (netdev_get_dev(netdev)->netdev_class->arp_lookup
921 ? netdev_get_dev(netdev)->netdev_class->arp_lookup(netdev,
925 memset(mac, 0, ETH_ADDR_LEN);
930 /* Returns true if carrier is active (link light is on) on 'netdev'. */
932 netdev_get_carrier(const struct netdev *netdev)
935 enum netdev_flags flags;
938 netdev_get_flags(netdev, &flags);
939 if (!(flags & NETDEV_UP)) {
943 if (!netdev_get_dev(netdev)->netdev_class->get_carrier) {
947 error = netdev_get_dev(netdev)->netdev_class->get_carrier(netdev,
950 VLOG_DBG("%s: failed to get network device carrier status, assuming "
951 "down: %s", netdev_get_name(netdev), strerror(error));
958 /* Returns the number of times 'netdev''s carrier has changed. */
960 netdev_get_carrier_resets(const struct netdev *netdev)
962 return (netdev_get_dev(netdev)->netdev_class->get_carrier_resets
963 ? netdev_get_dev(netdev)->netdev_class->get_carrier_resets(netdev)
967 /* Attempts to force netdev_get_carrier() to poll 'netdev''s MII registers for
968 * link status instead of checking 'netdev''s carrier. 'netdev''s MII
969 * registers will be polled once ever 'interval' milliseconds. If 'netdev'
970 * does not support MII, another method may be used as a fallback. If
971 * 'interval' is less than or equal to zero, reverts netdev_get_carrier() to
972 * its normal behavior.
974 * Returns 0 if successful, otherwise a positive errno value. */
976 netdev_set_miimon_interval(struct netdev *netdev, long long int interval)
978 struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
979 return (netdev_dev->netdev_class->set_miimon_interval
980 ? netdev_dev->netdev_class->set_miimon_interval(netdev, interval)
984 /* Retrieves current device stats for 'netdev'. */
986 netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
990 COVERAGE_INC(netdev_get_stats);
991 error = (netdev_get_dev(netdev)->netdev_class->get_stats
992 ? netdev_get_dev(netdev)->netdev_class->get_stats(netdev, stats)
995 memset(stats, 0xff, sizeof *stats);
1000 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
1001 * Returns 0 if successful, otherwise a positive errno value.
1003 * This will probably fail for most network devices. Some devices might only
1004 * allow setting their stats to 0. */
1006 netdev_set_stats(struct netdev *netdev, const struct netdev_stats *stats)
1008 return (netdev_get_dev(netdev)->netdev_class->set_stats
1009 ? netdev_get_dev(netdev)->netdev_class->set_stats(netdev, stats)
1013 /* Attempts to set input rate limiting (policing) policy, such that up to
1014 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
1015 * size of 'kbits' kb. */
1017 netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
1018 uint32_t kbits_burst)
1020 return (netdev_get_dev(netdev)->netdev_class->set_policing
1021 ? netdev_get_dev(netdev)->netdev_class->set_policing(netdev,
1022 kbits_rate, kbits_burst)
1026 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
1027 * empty if 'netdev' does not support QoS. Any names added to 'types' should
1028 * be documented as valid for the "type" column in the "QoS" table in
1029 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1031 * Every network device supports disabling QoS with a type of "", but this type
1032 * will not be added to 'types'.
1034 * The caller must initialize 'types' (e.g. with sset_init()) before calling
1035 * this function. The caller is responsible for destroying 'types' (e.g. with
1036 * sset_destroy()) when it is no longer needed.
1038 * Returns 0 if successful, otherwise a positive errno value. */
1040 netdev_get_qos_types(const struct netdev *netdev, struct sset *types)
1042 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1043 return (class->get_qos_types
1044 ? class->get_qos_types(netdev, types)
1048 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
1049 * which should be "" or one of the types returned by netdev_get_qos_types()
1050 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
1051 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
1052 * 'caps' to all zeros. */
1054 netdev_get_qos_capabilities(const struct netdev *netdev, const char *type,
1055 struct netdev_qos_capabilities *caps)
1057 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1060 int retval = (class->get_qos_capabilities
1061 ? class->get_qos_capabilities(netdev, type, caps)
1064 memset(caps, 0, sizeof *caps);
1068 /* Every netdev supports turning off QoS. */
1069 memset(caps, 0, sizeof *caps);
1074 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1075 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1076 * the number of queues (zero on failure) in '*n_queuesp'.
1078 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1080 netdev_get_n_queues(const struct netdev *netdev,
1081 const char *type, unsigned int *n_queuesp)
1083 struct netdev_qos_capabilities caps;
1086 retval = netdev_get_qos_capabilities(netdev, type, &caps);
1087 *n_queuesp = caps.n_queues;
1091 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1092 * stores the name of the current form of QoS into '*typep', stores any details
1093 * of configuration as string key-value pairs in 'details', and returns 0. On
1094 * failure, sets '*typep' to NULL and returns a positive errno value.
1096 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1098 * The caller must initialize 'details' as an empty smap (e.g. with
1099 * smap_init()) before calling this function. The caller must free 'details'
1100 * when it is no longer needed (e.g. with smap_destroy()).
1102 * The caller must not modify or free '*typep'.
1104 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1105 * 'netdev'. The contents of 'details' should be documented as valid for
1106 * '*typep' in the "other_config" column in the "QoS" table in
1107 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1109 netdev_get_qos(const struct netdev *netdev,
1110 const char **typep, struct smap *details)
1112 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1115 if (class->get_qos) {
1116 retval = class->get_qos(netdev, typep, details);
1119 smap_clear(details);
1123 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1129 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1130 * with details of configuration from 'details'. Returns 0 if successful,
1131 * otherwise a positive errno value. On error, the previous QoS configuration
1134 * When this function changes the type of QoS (not just 'details'), this also
1135 * resets all queue configuration for 'netdev' to their defaults (which depend
1136 * on the specific type of QoS). Otherwise, the queue configuration for
1137 * 'netdev' is unchanged.
1139 * 'type' should be "" (to disable QoS) or one of the types returned by
1140 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1141 * documented as valid for the given 'type' in the "other_config" column in the
1142 * "QoS" table in vswitchd/vswitch.xml (which is built as
1143 * ovs-vswitchd.conf.db(8)).
1145 * NULL may be specified for 'details' if there are no configuration
1148 netdev_set_qos(struct netdev *netdev,
1149 const char *type, const struct smap *details)
1151 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1157 if (class->set_qos) {
1159 static const struct smap empty = SMAP_INITIALIZER(&empty);
1162 return class->set_qos(netdev, type, details);
1164 return *type ? EOPNOTSUPP : 0;
1168 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1169 * successful, adds that information as string key-value pairs to 'details'.
1170 * Returns 0 if successful, otherwise a positive errno value.
1172 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1173 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1175 * The returned contents of 'details' should be documented as valid for the
1176 * given 'type' in the "other_config" column in the "Queue" table in
1177 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1179 * The caller must initialize 'details' (e.g. with smap_init()) before calling
1180 * this function. The caller must free 'details' when it is no longer needed
1181 * (e.g. with smap_destroy()). */
1183 netdev_get_queue(const struct netdev *netdev,
1184 unsigned int queue_id, struct smap *details)
1186 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1189 retval = (class->get_queue
1190 ? class->get_queue(netdev, queue_id, details)
1193 smap_clear(details);
1198 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1199 * string pairs in 'details'. The contents of 'details' should be documented
1200 * as valid for the given 'type' in the "other_config" column in the "Queue"
1201 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1202 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1203 * given queue's configuration should be unmodified.
1205 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1206 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1208 * This function does not modify 'details', and the caller retains ownership of
1211 netdev_set_queue(struct netdev *netdev,
1212 unsigned int queue_id, const struct smap *details)
1214 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1215 return (class->set_queue
1216 ? class->set_queue(netdev, queue_id, details)
1220 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1221 * of QoS may have a fixed set of queues, in which case attempts to delete them
1222 * will fail with EOPNOTSUPP.
1224 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1225 * given queue will be unmodified.
1227 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1228 * the current form of QoS (e.g. as returned by
1229 * netdev_get_n_queues(netdev)). */
1231 netdev_delete_queue(struct netdev *netdev, unsigned int queue_id)
1233 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1234 return (class->delete_queue
1235 ? class->delete_queue(netdev, queue_id)
1239 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1240 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1241 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1242 * positive errno value and fills 'stats' with all-1-bits. */
1244 netdev_get_queue_stats(const struct netdev *netdev, unsigned int queue_id,
1245 struct netdev_queue_stats *stats)
1247 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1250 retval = (class->get_queue_stats
1251 ? class->get_queue_stats(netdev, queue_id, stats)
1254 memset(stats, 0xff, sizeof *stats);
1259 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1260 * its configuration, and the 'aux' specified by the caller. The order of
1261 * iteration is unspecified, but (when successful) each queue is visited
1264 * Calling this function may be more efficient than calling netdev_get_queue()
1267 * 'cb' must not modify or free the 'details' argument passed in. It may
1268 * delete or modify the queue passed in as its 'queue_id' argument. It may
1269 * modify but must not delete any other queue within 'netdev'. 'cb' should not
1270 * add new queues because this may cause some queues to be visited twice or not
1273 * Returns 0 if successful, otherwise a positive errno value. On error, some
1274 * configured queues may not have been included in the iteration. */
1276 netdev_dump_queues(const struct netdev *netdev,
1277 netdev_dump_queues_cb *cb, void *aux)
1279 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1280 return (class->dump_queues
1281 ? class->dump_queues(netdev, cb, aux)
1285 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1286 * its statistics, and the 'aux' specified by the caller. The order of
1287 * iteration is unspecified, but (when successful) each queue is visited
1290 * Calling this function may be more efficient than calling
1291 * netdev_get_queue_stats() for every queue.
1293 * 'cb' must not modify or free the statistics passed in.
1295 * Returns 0 if successful, otherwise a positive errno value. On error, some
1296 * configured queues may not have been included in the iteration. */
1298 netdev_dump_queue_stats(const struct netdev *netdev,
1299 netdev_dump_queue_stats_cb *cb, void *aux)
1301 const struct netdev_class *class = netdev_get_dev(netdev)->netdev_class;
1302 return (class->dump_queue_stats
1303 ? class->dump_queue_stats(netdev, cb, aux)
1307 /* Returns a sequence number which indicates changes in one of 'netdev''s
1308 * properties. The returned sequence will be nonzero so that callers have a
1309 * value which they may use as a reset when tracking 'netdev'.
1311 * The returned sequence number will change whenever 'netdev''s flags,
1312 * features, ethernet address, or carrier changes. It may change for other
1313 * reasons as well, or no reason at all. */
1315 netdev_change_seq(const struct netdev *netdev)
1317 return netdev_get_dev(netdev)->netdev_class->change_seq(netdev);
1320 /* Initializes 'netdev_dev' as a netdev device named 'name' of the specified
1321 * 'netdev_class'. This function is ordinarily called from a netdev provider's
1322 * 'create' function.
1324 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1325 * very important that 'netdev_dev' only be freed after calling
1326 * the refcount drops to zero. */
1328 netdev_dev_init(struct netdev_dev *netdev_dev, const char *name,
1329 const struct netdev_class *netdev_class)
1331 ovs_assert(!shash_find(&netdev_dev_shash, name));
1333 memset(netdev_dev, 0, sizeof *netdev_dev);
1334 netdev_dev->netdev_class = netdev_class;
1335 netdev_dev->name = xstrdup(name);
1336 netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev);
1337 list_init(&netdev_dev->saved_flags_list);
1340 /* Undoes the results of initialization.
1342 * Normally this function does not need to be called as netdev_close has
1343 * the same effect when the refcount drops to zero.
1344 * However, it may be called by providers due to an error on creation
1345 * that occurs after initialization. It this case netdev_close() would
1346 * never be called. */
1348 netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy)
1350 char *name = netdev_dev->name;
1352 ovs_assert(!netdev_dev->ref_cnt);
1353 ovs_assert(list_is_empty(&netdev_dev->saved_flags_list));
1355 shash_delete(&netdev_dev_shash, netdev_dev->node);
1358 netdev_dev->netdev_class->destroy(netdev_dev);
1363 /* Returns the class type of 'netdev_dev'.
1365 * The caller must not free the returned value. */
1367 netdev_dev_get_type(const struct netdev_dev *netdev_dev)
1369 return netdev_dev->netdev_class->type;
1372 /* Returns the class associated with 'netdev_dev'. */
1373 const struct netdev_class *
1374 netdev_dev_get_class(const struct netdev_dev *netdev_dev)
1376 return netdev_dev->netdev_class;
1379 /* Returns the name of 'netdev_dev'.
1381 * The caller must not free the returned value. */
1383 netdev_dev_get_name(const struct netdev_dev *netdev_dev)
1385 return netdev_dev->name;
1388 /* Returns the netdev_dev with 'name' or NULL if there is none.
1390 * The caller must not free the returned value. */
1392 netdev_dev_from_name(const char *name)
1394 return shash_find_data(&netdev_dev_shash, name);
1397 /* Fills 'device_list' with devices that match 'netdev_class'.
1399 * The caller is responsible for initializing and destroying 'device_list'
1400 * but the contained netdev_devs must not be freed. */
1402 netdev_dev_get_devices(const struct netdev_class *netdev_class,
1403 struct shash *device_list)
1405 struct shash_node *node;
1406 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1407 struct netdev_dev *dev = node->data;
1409 if (dev->netdev_class == netdev_class) {
1410 shash_add(device_list, node->name, node->data);
1415 /* Initializes 'netdev' as a instance of the netdev_dev.
1417 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1418 * important that 'netdev' only be freed after calling netdev_close(). */
1420 netdev_init(struct netdev *netdev, struct netdev_dev *netdev_dev)
1422 memset(netdev, 0, sizeof *netdev);
1423 netdev->netdev_dev = netdev_dev;
1424 list_push_back(&netdev_list, &netdev->node);
1427 /* Undoes the results of initialization.
1429 * Normally this function only needs to be called from netdev_close().
1430 * However, it may be called by providers due to an error on opening
1431 * that occurs after initialization. It this case netdev_close() would
1432 * never be called. */
1434 netdev_uninit(struct netdev *netdev, bool close)
1436 list_remove(&netdev->node);
1438 netdev_get_dev(netdev)->netdev_class->close(netdev);
1442 /* Returns the class type of 'netdev'.
1444 * The caller must not free the returned value. */
1446 netdev_get_type(const struct netdev *netdev)
1448 return netdev_get_dev(netdev)->netdev_class->type;
1452 netdev_get_type_from_name(const char *name)
1454 const struct netdev_dev *dev = netdev_dev_from_name(name);
1455 return dev ? netdev_dev_get_type(dev) : NULL;
1459 netdev_get_dev(const struct netdev *netdev)
1461 return netdev->netdev_dev;
1464 /* Restores all flags that have been saved with netdev_save_flags() and not yet
1465 * restored with netdev_restore_flags(). */
1467 restore_all_flags(void *aux OVS_UNUSED)
1469 struct shash_node *node;
1471 SHASH_FOR_EACH (node, &netdev_dev_shash) {
1472 struct netdev_dev *dev = node->data;
1473 const struct netdev_saved_flags *sf;
1474 enum netdev_flags saved_values;
1475 enum netdev_flags saved_flags;
1477 saved_values = saved_flags = 0;
1478 LIST_FOR_EACH (sf, node, &dev->saved_flags_list) {
1479 saved_flags |= sf->saved_flags;
1480 saved_values &= ~sf->saved_flags;
1481 saved_values |= sf->saved_flags & sf->saved_values;
1484 enum netdev_flags old_flags;
1486 dev->netdev_class->update_flags(dev,
1487 saved_flags & saved_values,
1488 saved_flags & ~saved_values,