2 * Copyright (c) 2008, 2009, 2010 Nicira Networks.
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.
23 #include <netinet/in.h>
29 #include "dynamic-string.h"
30 #include "fatal-signal.h"
33 #include "netdev-provider.h"
34 #include "netdev-vport.h"
36 #include "openflow/openflow.h"
38 #include "poll-loop.h"
43 VLOG_DEFINE_THIS_MODULE(netdev
);
45 COVERAGE_DEFINE(netdev_received
);
46 COVERAGE_DEFINE(netdev_sent
);
47 COVERAGE_DEFINE(netdev_add_router
);
48 COVERAGE_DEFINE(netdev_get_stats
);
50 static struct shash netdev_classes
= SHASH_INITIALIZER(&netdev_classes
);
52 /* All created network devices. */
53 static struct shash netdev_dev_shash
= SHASH_INITIALIZER(&netdev_dev_shash
);
55 /* All open network devices. */
56 static struct list netdev_list
= LIST_INITIALIZER(&netdev_list
);
58 /* This is set pretty low because we probably won't learn anything from the
59 * additional log messages. */
60 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(5, 20);
62 static void close_all_netdevs(void *aux OVS_UNUSED
);
63 static int restore_flags(struct netdev
*netdev
);
64 void update_device_args(struct netdev_dev
*, const struct shash
*args
);
67 netdev_initialize(void)
74 fatal_signal_add_hook(close_all_netdevs
, NULL
, NULL
, true);
77 netdev_register_provider(&netdev_linux_class
);
78 netdev_register_provider(&netdev_internal_class
);
79 netdev_register_provider(&netdev_tap_class
);
80 netdev_vport_register();
85 /* Performs periodic work needed by all the various kinds of netdevs.
87 * If your program opens any netdevs, it must call this function within its
92 struct shash_node
*node
;
93 SHASH_FOR_EACH(node
, &netdev_classes
) {
94 const struct netdev_class
*netdev_class
= node
->data
;
95 if (netdev_class
->run
) {
101 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
103 * If your program opens any netdevs, it must call this function within its
108 struct shash_node
*node
;
109 SHASH_FOR_EACH(node
, &netdev_classes
) {
110 const struct netdev_class
*netdev_class
= node
->data
;
111 if (netdev_class
->wait
) {
112 netdev_class
->wait();
117 /* Initializes and registers a new netdev provider. After successful
118 * registration, new netdevs of that type can be opened using netdev_open(). */
120 netdev_register_provider(const struct netdev_class
*new_class
)
122 if (shash_find(&netdev_classes
, new_class
->type
)) {
123 VLOG_WARN("attempted to register duplicate netdev provider: %s",
128 if (new_class
->init
) {
129 int error
= new_class
->init();
131 VLOG_ERR("failed to initialize %s network device class: %s",
132 new_class
->type
, strerror(error
));
137 shash_add(&netdev_classes
, new_class
->type
, new_class
);
142 /* Unregisters a netdev provider. 'type' must have been previously
143 * registered and not currently be in use by any netdevs. After unregistration
144 * new netdevs of that type cannot be opened using netdev_open(). */
146 netdev_unregister_provider(const char *type
)
148 struct shash_node
*del_node
, *netdev_dev_node
;
150 del_node
= shash_find(&netdev_classes
, type
);
152 VLOG_WARN("attempted to unregister a netdev provider that is not "
153 "registered: %s", type
);
157 SHASH_FOR_EACH(netdev_dev_node
, &netdev_dev_shash
) {
158 struct netdev_dev
*netdev_dev
= netdev_dev_node
->data
;
159 if (!strcmp(netdev_dev
->netdev_class
->type
, type
)) {
160 VLOG_WARN("attempted to unregister in use netdev provider: %s",
166 shash_delete(&netdev_classes
, del_node
);
171 const struct netdev_class
*
172 netdev_lookup_provider(const char *type
)
175 return shash_find_data(&netdev_classes
, type
&& type
[0] ? type
: "system");
178 /* Clears 'types' and enumerates the types of all currently registered netdev
179 * providers into it. The caller must first initialize the svec. */
181 netdev_enumerate_types(struct svec
*types
)
183 struct shash_node
*node
;
188 SHASH_FOR_EACH(node
, &netdev_classes
) {
189 const struct netdev_class
*netdev_class
= node
->data
;
190 svec_add(types
, netdev_class
->type
);
194 /* Compares 'args' to those used to those used by 'dev'. Returns true
195 * if the arguments are the same, false otherwise. Does not update the
196 * values stored in 'dev'. */
198 compare_device_args(const struct netdev_dev
*dev
, const struct shash
*args
)
200 const struct shash_node
**new_args
;
204 if (shash_count(args
) != dev
->n_args
) {
208 new_args
= shash_sort(args
);
209 for (i
= 0; i
< dev
->n_args
; i
++) {
210 if (strcmp(dev
->args
[i
].key
, new_args
[i
]->name
) ||
211 strcmp(dev
->args
[i
].value
, new_args
[i
]->data
)) {
223 compare_args(const void *a_
, const void *b_
)
225 const struct arg
*a
= a_
;
226 const struct arg
*b
= b_
;
227 return strcmp(a
->key
, b
->key
);
231 update_device_args(struct netdev_dev
*dev
, const struct shash
*args
)
233 struct shash_node
*node
;
237 for (i
= 0; i
< dev
->n_args
; i
++) {
238 free(dev
->args
[i
].key
);
239 free(dev
->args
[i
].value
);
246 if (!args
|| shash_is_empty(args
)) {
250 dev
->n_args
= shash_count(args
);
251 dev
->args
= xmalloc(dev
->n_args
* sizeof *dev
->args
);
254 SHASH_FOR_EACH(node
, args
) {
255 dev
->args
[i
].key
= xstrdup(node
->name
);
256 dev
->args
[i
].value
= xstrdup(node
->data
);
260 qsort(dev
->args
, dev
->n_args
, sizeof *dev
->args
, compare_args
);
263 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
264 * successful, otherwise a positive errno value. On success, sets '*netdevp'
265 * to the new network device, otherwise to null.
267 * If this is the first time the device has been opened, then create is called
268 * before opening. The device is created using the given type and arguments.
270 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
271 * capture frames of that type received on the device. It may also be one of
272 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
275 netdev_open(struct netdev_options
*options
, struct netdev
**netdevp
)
277 struct shash empty_args
= SHASH_INITIALIZER(&empty_args
);
278 struct netdev_dev
*netdev_dev
;
284 if (!options
->args
) {
285 options
->args
= &empty_args
;
288 netdev_dev
= shash_find_data(&netdev_dev_shash
, options
->name
);
291 const struct netdev_class
*class;
293 class = netdev_lookup_provider(options
->type
);
295 VLOG_WARN("could not create netdev %s of unknown type %s",
296 options
->name
, options
->type
);
299 error
= class->create(class, options
->name
, options
->args
,
304 assert(netdev_dev
->netdev_class
== class);
305 update_device_args(netdev_dev
, options
->args
);
307 } else if (!shash_is_empty(options
->args
) &&
308 !compare_device_args(netdev_dev
, options
->args
)) {
310 VLOG_WARN("%s: attempted to open already open netdev with "
311 "different arguments", options
->name
);
315 error
= netdev_dev
->netdev_class
->open(netdev_dev
, options
->ethertype
,
319 netdev_dev
->ref_cnt
++;
321 if (!netdev_dev
->ref_cnt
) {
322 netdev_dev_uninit(netdev_dev
, true);
330 netdev_open_default(const char *name
, struct netdev
**netdevp
)
332 struct netdev_options options
;
334 memset(&options
, 0, sizeof options
);
336 options
.ethertype
= NETDEV_ETH_TYPE_NONE
;
338 return netdev_open(&options
, netdevp
);
341 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
342 * or NULL if none are needed. */
344 netdev_reconfigure(struct netdev
*netdev
, const struct shash
*args
)
346 struct shash empty_args
= SHASH_INITIALIZER(&empty_args
);
347 struct netdev_dev
*netdev_dev
= netdev_get_dev(netdev
);
353 if (netdev_dev
->netdev_class
->reconfigure
) {
354 if (!compare_device_args(netdev_dev
, args
)) {
355 update_device_args(netdev_dev
, args
);
356 return netdev_dev
->netdev_class
->reconfigure(netdev_dev
, args
);
358 } else if (!shash_is_empty(args
)) {
359 VLOG_WARN("%s: arguments provided to device that does not have a "
360 "reconfigure function", netdev_get_name(netdev
));
366 /* Closes and destroys 'netdev'. */
368 netdev_close(struct netdev
*netdev
)
371 struct netdev_dev
*netdev_dev
= netdev_get_dev(netdev
);
373 assert(netdev_dev
->ref_cnt
);
374 netdev_dev
->ref_cnt
--;
375 netdev_uninit(netdev
, true);
377 /* If the reference count for the netdev device is zero, destroy it. */
378 if (!netdev_dev
->ref_cnt
) {
379 netdev_dev_uninit(netdev_dev
, true);
384 /* Returns true if a network device named 'name' exists and may be opened,
385 * otherwise false. */
387 netdev_exists(const char *name
)
389 struct netdev
*netdev
;
392 error
= netdev_open_default(name
, &netdev
);
394 netdev_close(netdev
);
397 if (error
!= ENODEV
) {
398 VLOG_WARN("failed to open network device %s: %s",
399 name
, strerror(error
));
405 /* Returns true if a network device named 'name' is currently opened,
406 * otherwise false. */
408 netdev_is_open(const char *name
)
410 return !!shash_find_data(&netdev_dev_shash
, name
);
413 /* Clears 'svec' and enumerates the names of all known network devices. */
415 netdev_enumerate(struct svec
*svec
)
417 struct shash_node
*node
;
423 SHASH_FOR_EACH(node
, &netdev_classes
) {
424 const struct netdev_class
*netdev_class
= node
->data
;
425 if (netdev_class
->enumerate
) {
426 int retval
= netdev_class
->enumerate(svec
);
428 VLOG_WARN("failed to enumerate %s network devices: %s",
429 netdev_class
->type
, strerror(retval
));
440 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
441 * must have initialized with sufficient room for the packet. The space
442 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
443 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
444 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
445 * need not be included.)
447 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
448 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
449 * positive errno value. Returns EAGAIN immediately if no packet is ready to
452 * Some network devices may not implement support for this function. In such
453 * cases this function will always return EOPNOTSUPP. */
455 netdev_recv(struct netdev
*netdev
, struct ofpbuf
*buffer
)
457 int (*recv
)(struct netdev
*, void *, size_t);
460 assert(buffer
->size
== 0);
461 assert(ofpbuf_tailroom(buffer
) >= ETH_TOTAL_MIN
);
463 recv
= netdev_get_dev(netdev
)->netdev_class
->recv
;
465 ? (recv
)(netdev
, buffer
->data
, ofpbuf_tailroom(buffer
))
468 COVERAGE_INC(netdev_received
);
469 buffer
->size
+= retval
;
470 if (buffer
->size
< ETH_TOTAL_MIN
) {
471 ofpbuf_put_zeros(buffer
, ETH_TOTAL_MIN
- buffer
->size
);
479 /* Registers with the poll loop to wake up from the next call to poll_block()
480 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
482 netdev_recv_wait(struct netdev
*netdev
)
484 void (*recv_wait
)(struct netdev
*);
486 recv_wait
= netdev_get_dev(netdev
)->netdev_class
->recv_wait
;
492 /* Discards all packets waiting to be received from 'netdev'. */
494 netdev_drain(struct netdev
*netdev
)
496 int (*drain
)(struct netdev
*);
498 drain
= netdev_get_dev(netdev
)->netdev_class
->drain
;
499 return drain
? drain(netdev
) : 0;
502 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
503 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
504 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
505 * the packet is too big or too small to transmit on the device.
507 * The caller retains ownership of 'buffer' in all cases.
509 * The kernel maintains a packet transmission queue, so the caller is not
510 * expected to do additional queuing of packets.
512 * Some network devices may not implement support for this function. In such
513 * cases this function will always return EOPNOTSUPP. */
515 netdev_send(struct netdev
*netdev
, const struct ofpbuf
*buffer
)
517 int (*send
)(struct netdev
*, const void *, size_t);
520 send
= netdev_get_dev(netdev
)->netdev_class
->send
;
521 error
= send
? (send
)(netdev
, buffer
->data
, buffer
->size
) : EOPNOTSUPP
;
523 COVERAGE_INC(netdev_sent
);
528 /* Registers with the poll loop to wake up from the next call to poll_block()
529 * when the packet transmission queue has sufficient room to transmit a packet
530 * with netdev_send().
532 * The kernel maintains a packet transmission queue, so the client is not
533 * expected to do additional queuing of packets. Thus, this function is
534 * unlikely to ever be used. It is included for completeness. */
536 netdev_send_wait(struct netdev
*netdev
)
538 void (*send_wait
)(struct netdev
*);
540 send_wait
= netdev_get_dev(netdev
)->netdev_class
->send_wait
;
546 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
547 * otherwise a positive errno value. */
549 netdev_set_etheraddr(struct netdev
*netdev
, const uint8_t mac
[ETH_ADDR_LEN
])
551 return netdev_get_dev(netdev
)->netdev_class
->set_etheraddr(netdev
, mac
);
554 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
555 * the MAC address into 'mac'. On failure, returns a positive errno value and
556 * clears 'mac' to all-zeros. */
558 netdev_get_etheraddr(const struct netdev
*netdev
, uint8_t mac
[ETH_ADDR_LEN
])
560 return netdev_get_dev(netdev
)->netdev_class
->get_etheraddr(netdev
, mac
);
563 /* Returns the name of the network device that 'netdev' represents,
564 * e.g. "eth0". The caller must not modify or free the returned string. */
566 netdev_get_name(const struct netdev
*netdev
)
568 return netdev_get_dev(netdev
)->name
;
571 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
572 * (and received) packets, in bytes, not including the hardware header; thus,
573 * this is typically 1500 bytes for Ethernet devices.
575 * If successful, returns 0 and stores the MTU size in '*mtup'. On failure,
576 * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in
579 netdev_get_mtu(const struct netdev
*netdev
, int *mtup
)
581 int error
= netdev_get_dev(netdev
)->netdev_class
->get_mtu(netdev
, mtup
);
583 VLOG_WARN_RL(&rl
, "failed to retrieve MTU for network device %s: %s",
584 netdev_get_name(netdev
), strerror(error
));
585 *mtup
= ETH_PAYLOAD_MAX
;
590 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
591 * failure, returns a negative errno value.
593 * The desired semantics of the ifindex value are a combination of those
594 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
595 * value should be unique within a host and remain stable at least until
596 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
597 * but many systems do not follow this rule anyhow.
599 * Some network devices may not implement support for this function. In such
600 * cases this function will always return -EOPNOTSUPP.
603 netdev_get_ifindex(const struct netdev
*netdev
)
605 int (*get_ifindex
)(const struct netdev
*);
607 get_ifindex
= netdev_get_dev(netdev
)->netdev_class
->get_ifindex
;
609 return get_ifindex
? get_ifindex(netdev
) : -EOPNOTSUPP
;
612 /* Stores the features supported by 'netdev' into each of '*current',
613 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
614 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
615 * successful, otherwise a positive errno value. On failure, all of the
616 * passed-in values are set to 0.
618 * Some network devices may not implement support for this function. In such
619 * cases this function will always return EOPNOTSUPP. */
621 netdev_get_features(struct netdev
*netdev
,
622 uint32_t *current
, uint32_t *advertised
,
623 uint32_t *supported
, uint32_t *peer
)
625 int (*get_features
)(struct netdev
*netdev
,
626 uint32_t *current
, uint32_t *advertised
,
627 uint32_t *supported
, uint32_t *peer
);
635 advertised
= &dummy
[1];
638 supported
= &dummy
[2];
644 get_features
= netdev_get_dev(netdev
)->netdev_class
->get_features
;
646 ? get_features(netdev
, current
, advertised
, supported
, peer
)
649 *current
= *advertised
= *supported
= *peer
= 0;
654 /* Returns the maximum speed of a network connection that has the "enum
655 * ofp_port_features" bits in 'features', in bits per second. If no bits that
656 * indicate a speed are set in 'features', assumes 100Mbps. */
658 netdev_features_to_bps(uint32_t features
)
661 F_10000MB
= OFPPF_10GB_FD
,
662 F_1000MB
= OFPPF_1GB_HD
| OFPPF_1GB_FD
,
663 F_100MB
= OFPPF_100MB_HD
| OFPPF_100MB_FD
,
664 F_10MB
= OFPPF_10MB_HD
| OFPPF_10MB_FD
667 return ( features
& F_10000MB
? UINT64_C(10000000000)
668 : features
& F_1000MB
? UINT64_C(1000000000)
669 : features
& F_100MB
? UINT64_C(100000000)
670 : features
& F_10MB
? UINT64_C(10000000)
671 : UINT64_C(100000000));
674 /* Returns true if any of the "enum ofp_port_features" bits that indicate a
675 * full-duplex link are set in 'features', otherwise false. */
677 netdev_features_is_full_duplex(uint32_t features
)
679 return (features
& (OFPPF_10MB_FD
| OFPPF_100MB_FD
| OFPPF_1GB_FD
680 | OFPPF_10GB_FD
)) != 0;
683 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
684 * successful, otherwise a positive errno value. */
686 netdev_set_advertisements(struct netdev
*netdev
, uint32_t advertise
)
688 return (netdev_get_dev(netdev
)->netdev_class
->set_advertisements
689 ? netdev_get_dev(netdev
)->netdev_class
->set_advertisements(
694 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
695 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
696 * errno value and sets '*address' to 0 (INADDR_ANY).
698 * The following error values have well-defined meanings:
700 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
702 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
704 * 'address' or 'netmask' or both may be null, in which case the address or
705 * netmask is not reported. */
707 netdev_get_in4(const struct netdev
*netdev
,
708 struct in_addr
*address_
, struct in_addr
*netmask_
)
710 struct in_addr address
;
711 struct in_addr netmask
;
714 error
= (netdev_get_dev(netdev
)->netdev_class
->get_in4
715 ? netdev_get_dev(netdev
)->netdev_class
->get_in4(netdev
,
719 address_
->s_addr
= error
? 0 : address
.s_addr
;
722 netmask_
->s_addr
= error
? 0 : netmask
.s_addr
;
727 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
728 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
729 * positive errno value. */
731 netdev_set_in4(struct netdev
*netdev
, struct in_addr addr
, struct in_addr mask
)
733 return (netdev_get_dev(netdev
)->netdev_class
->set_in4
734 ? netdev_get_dev(netdev
)->netdev_class
->set_in4(netdev
, addr
, mask
)
738 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
741 netdev_add_router(struct netdev
*netdev
, struct in_addr router
)
743 COVERAGE_INC(netdev_add_router
);
744 return (netdev_get_dev(netdev
)->netdev_class
->add_router
745 ? netdev_get_dev(netdev
)->netdev_class
->add_router(netdev
, router
)
749 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
750 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
751 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
752 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
753 * a directly connected network) in '*next_hop' and a copy of the name of the
754 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
755 * responsible for freeing '*netdev_name' (by calling free()). */
757 netdev_get_next_hop(const struct netdev
*netdev
,
758 const struct in_addr
*host
, struct in_addr
*next_hop
,
761 int error
= (netdev_get_dev(netdev
)->netdev_class
->get_next_hop
762 ? netdev_get_dev(netdev
)->netdev_class
->get_next_hop(
763 host
, next_hop
, netdev_name
)
766 next_hop
->s_addr
= 0;
772 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
773 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
774 * all-zero-bits (in6addr_any).
776 * The following error values have well-defined meanings:
778 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
780 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
782 * 'in6' may be null, in which case the address itself is not reported. */
784 netdev_get_in6(const struct netdev
*netdev
, struct in6_addr
*in6
)
786 struct in6_addr dummy
;
789 error
= (netdev_get_dev(netdev
)->netdev_class
->get_in6
790 ? netdev_get_dev(netdev
)->netdev_class
->get_in6(netdev
,
794 memset(in6
, 0, sizeof *in6
);
799 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
800 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
801 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
802 * successful, otherwise a positive errno value. */
804 do_update_flags(struct netdev
*netdev
, enum netdev_flags off
,
805 enum netdev_flags on
, enum netdev_flags
*old_flagsp
,
808 enum netdev_flags old_flags
;
811 error
= netdev_get_dev(netdev
)->netdev_class
->update_flags(netdev
,
812 off
& ~on
, on
, &old_flags
);
814 VLOG_WARN_RL(&rl
, "failed to %s flags for network device %s: %s",
815 off
|| on
? "set" : "get", netdev_get_name(netdev
),
818 } else if ((off
|| on
) && !permanent
) {
819 enum netdev_flags new_flags
= (old_flags
& ~off
) | on
;
820 enum netdev_flags changed_flags
= old_flags
^ new_flags
;
822 if (!netdev
->changed_flags
) {
823 netdev
->save_flags
= old_flags
;
825 netdev
->changed_flags
|= changed_flags
;
829 *old_flagsp
= old_flags
;
834 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
835 * Returns 0 if successful, otherwise a positive errno value. On failure,
836 * stores 0 into '*flagsp'. */
838 netdev_get_flags(const struct netdev
*netdev_
, enum netdev_flags
*flagsp
)
840 struct netdev
*netdev
= (struct netdev
*) netdev_
;
841 return do_update_flags(netdev
, 0, 0, flagsp
, false);
844 /* Sets the flags for 'netdev' to 'flags'.
845 * If 'permanent' is true, the changes will persist; otherwise, they
846 * will be reverted when 'netdev' is closed or the program exits.
847 * Returns 0 if successful, otherwise a positive errno value. */
849 netdev_set_flags(struct netdev
*netdev
, enum netdev_flags flags
,
852 return do_update_flags(netdev
, -1, flags
, NULL
, permanent
);
855 /* Turns on the specified 'flags' on 'netdev'.
856 * If 'permanent' is true, the changes will persist; otherwise, they
857 * will be reverted when 'netdev' is closed or the program exits.
858 * Returns 0 if successful, otherwise a positive errno value. */
860 netdev_turn_flags_on(struct netdev
*netdev
, enum netdev_flags flags
,
863 return do_update_flags(netdev
, 0, flags
, NULL
, permanent
);
866 /* Turns off the specified 'flags' on 'netdev'.
867 * If 'permanent' is true, the changes will persist; otherwise, they
868 * will be reverted when 'netdev' is closed or the program exits.
869 * Returns 0 if successful, otherwise a positive errno value. */
871 netdev_turn_flags_off(struct netdev
*netdev
, enum netdev_flags flags
,
874 return do_update_flags(netdev
, flags
, 0, NULL
, permanent
);
877 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
878 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
879 * returns 0. Otherwise, it returns a positive errno value; in particular,
880 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
882 netdev_arp_lookup(const struct netdev
*netdev
,
883 uint32_t ip
, uint8_t mac
[ETH_ADDR_LEN
])
885 int error
= (netdev_get_dev(netdev
)->netdev_class
->arp_lookup
886 ? netdev_get_dev(netdev
)->netdev_class
->arp_lookup(netdev
,
890 memset(mac
, 0, ETH_ADDR_LEN
);
895 /* Returns true if carrier is active (link light is on) on 'netdev'. */
897 netdev_get_carrier(const struct netdev
*netdev
)
900 enum netdev_flags flags
;
903 netdev_get_flags(netdev
, &flags
);
904 if (!(flags
& NETDEV_UP
)) {
908 if (!netdev_get_dev(netdev
)->netdev_class
->get_carrier
) {
912 error
= netdev_get_dev(netdev
)->netdev_class
->get_carrier(netdev
,
915 VLOG_DBG("%s: failed to get network device carrier status, assuming "
916 "down: %s", netdev_get_name(netdev
), strerror(error
));
923 /* Retrieves current device stats for 'netdev'. */
925 netdev_get_stats(const struct netdev
*netdev
, struct netdev_stats
*stats
)
929 COVERAGE_INC(netdev_get_stats
);
930 error
= (netdev_get_dev(netdev
)->netdev_class
->get_stats
931 ? netdev_get_dev(netdev
)->netdev_class
->get_stats(netdev
, stats
)
934 memset(stats
, 0xff, sizeof *stats
);
939 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
940 * Returns 0 if successful, otherwise a positive errno value.
942 * This will probably fail for most network devices. Some devices might only
943 * allow setting their stats to 0. */
945 netdev_set_stats(struct netdev
*netdev
, const struct netdev_stats
*stats
)
947 return (netdev_get_dev(netdev
)->netdev_class
->set_stats
948 ? netdev_get_dev(netdev
)->netdev_class
->set_stats(netdev
, stats
)
952 /* Attempts to set input rate limiting (policing) policy, such that up to
953 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
954 * size of 'kbits' kb. */
956 netdev_set_policing(struct netdev
*netdev
, uint32_t kbits_rate
,
957 uint32_t kbits_burst
)
959 return (netdev_get_dev(netdev
)->netdev_class
->set_policing
960 ? netdev_get_dev(netdev
)->netdev_class
->set_policing(netdev
,
961 kbits_rate
, kbits_burst
)
965 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
966 * empty if 'netdev' does not support QoS. Any names added to 'types' should
967 * be documented as valid for the "type" column in the "QoS" table in
968 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
970 * Every network device supports disabling QoS with a type of "", but this type
971 * will not be added to 'types'.
973 * The caller must initialize 'types' (e.g. with svec_init()) before calling
974 * this function. The caller is responsible for destroying 'types' (e.g. with
975 * svec_destroy()) when it is no longer needed.
977 * Returns 0 if successful, otherwise a positive errno value. */
979 netdev_get_qos_types(const struct netdev
*netdev
, struct svec
*types
)
981 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
982 return (class->get_qos_types
983 ? class->get_qos_types(netdev
, types
)
987 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
988 * which should be "" or one of the types returned by netdev_get_qos_types()
989 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
990 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
991 * 'caps' to all zeros. */
993 netdev_get_qos_capabilities(const struct netdev
*netdev
, const char *type
,
994 struct netdev_qos_capabilities
*caps
)
996 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
999 int retval
= (class->get_qos_capabilities
1000 ? class->get_qos_capabilities(netdev
, type
, caps
)
1003 memset(caps
, 0, sizeof *caps
);
1007 /* Every netdev supports turning off QoS. */
1008 memset(caps
, 0, sizeof *caps
);
1013 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1014 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1015 * the number of queues (zero on failure) in '*n_queuesp'.
1017 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1019 netdev_get_n_queues(const struct netdev
*netdev
,
1020 const char *type
, unsigned int *n_queuesp
)
1022 struct netdev_qos_capabilities caps
;
1025 retval
= netdev_get_qos_capabilities(netdev
, type
, &caps
);
1026 *n_queuesp
= caps
.n_queues
;
1030 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1031 * stores the name of the current form of QoS into '*typep', stores any details
1032 * of configuration as string key-value pairs in 'details', and returns 0. On
1033 * failure, sets '*typep' to NULL and returns a positive errno value.
1035 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1037 * The caller must initialize 'details' as an empty shash (e.g. with
1038 * shash_init()) before calling this function. The caller must free 'details',
1039 * including 'data' members, when it is no longer needed (e.g. with
1040 * shash_destroy_free_data()).
1042 * The caller must not modify or free '*typep'.
1044 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1045 * 'netdev'. The contents of 'details' should be documented as valid for
1046 * '*typep' in the "other_config" column in the "QoS" table in
1047 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1049 netdev_get_qos(const struct netdev
*netdev
,
1050 const char **typep
, struct shash
*details
)
1052 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1055 if (class->get_qos
) {
1056 retval
= class->get_qos(netdev
, typep
, details
);
1059 shash_clear_free_data(details
);
1063 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1069 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1070 * with details of configuration from 'details'. Returns 0 if successful,
1071 * otherwise a positive errno value. On error, the previous QoS configuration
1074 * When this function changes the type of QoS (not just 'details'), this also
1075 * resets all queue configuration for 'netdev' to their defaults (which depend
1076 * on the specific type of QoS). Otherwise, the queue configuration for
1077 * 'netdev' is unchanged.
1079 * 'type' should be "" (to disable QoS) or one of the types returned by
1080 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1081 * documented as valid for the given 'type' in the "other_config" column in the
1082 * "QoS" table in vswitchd/vswitch.xml (which is built as
1083 * ovs-vswitchd.conf.db(8)).
1085 * NULL may be specified for 'details' if there are no configuration
1088 netdev_set_qos(struct netdev
*netdev
,
1089 const char *type
, const struct shash
*details
)
1091 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1097 if (class->set_qos
) {
1099 static struct shash empty
= SHASH_INITIALIZER(&empty
);
1102 return class->set_qos(netdev
, type
, details
);
1104 return *type
? EOPNOTSUPP
: 0;
1108 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1109 * successful, adds that information as string key-value pairs to 'details'.
1110 * Returns 0 if successful, otherwise a positive errno value.
1112 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1113 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1115 * The returned contents of 'details' should be documented as valid for the
1116 * given 'type' in the "other_config" column in the "Queue" table in
1117 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1119 * The caller must initialize 'details' (e.g. with shash_init()) before calling
1120 * this function. The caller must free 'details', including 'data' members,
1121 * when it is no longer needed (e.g. with shash_destroy_free_data()). */
1123 netdev_get_queue(const struct netdev
*netdev
,
1124 unsigned int queue_id
, struct shash
*details
)
1126 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1129 retval
= (class->get_queue
1130 ? class->get_queue(netdev
, queue_id
, details
)
1133 shash_clear_free_data(details
);
1138 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1139 * string pairs in 'details'. The contents of 'details' should be documented
1140 * as valid for the given 'type' in the "other_config" column in the "Queue"
1141 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1142 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1143 * given queue's configuration should be unmodified.
1145 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1146 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1148 * This function does not modify 'details', and the caller retains ownership of
1151 netdev_set_queue(struct netdev
*netdev
,
1152 unsigned int queue_id
, const struct shash
*details
)
1154 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1155 return (class->set_queue
1156 ? class->set_queue(netdev
, queue_id
, details
)
1160 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1161 * of QoS may have a fixed set of queues, in which case attempts to delete them
1162 * will fail with EOPNOTSUPP.
1164 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1165 * given queue will be unmodified.
1167 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1168 * the current form of QoS (e.g. as returned by
1169 * netdev_get_n_queues(netdev)). */
1171 netdev_delete_queue(struct netdev
*netdev
, unsigned int queue_id
)
1173 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1174 return (class->delete_queue
1175 ? class->delete_queue(netdev
, queue_id
)
1179 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1180 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1181 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1182 * positive errno value and fills 'stats' with all-1-bits. */
1184 netdev_get_queue_stats(const struct netdev
*netdev
, unsigned int queue_id
,
1185 struct netdev_queue_stats
*stats
)
1187 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1190 retval
= (class->get_queue_stats
1191 ? class->get_queue_stats(netdev
, queue_id
, stats
)
1194 memset(stats
, 0xff, sizeof *stats
);
1199 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1200 * its configuration, and the 'aux' specified by the caller. The order of
1201 * iteration is unspecified, but (when successful) each queue is visited
1204 * Calling this function may be more efficient than calling netdev_get_queue()
1207 * 'cb' must not modify or free the 'details' argument passed in.
1209 * Returns 0 if successful, otherwise a positive errno value. On error, some
1210 * configured queues may not have been included in the iteration. */
1212 netdev_dump_queues(const struct netdev
*netdev
,
1213 netdev_dump_queues_cb
*cb
, void *aux
)
1215 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1216 return (class->dump_queues
1217 ? class->dump_queues(netdev
, cb
, aux
)
1221 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1222 * its statistics, and the 'aux' specified by the caller. The order of
1223 * iteration is unspecified, but (when successful) each queue is visited
1226 * Calling this function may be more efficient than calling
1227 * netdev_get_queue_stats() for every queue.
1229 * 'cb' must not modify or free the statistics passed in.
1231 * Returns 0 if successful, otherwise a positive errno value. On error, some
1232 * configured queues may not have been included in the iteration. */
1234 netdev_dump_queue_stats(const struct netdev
*netdev
,
1235 netdev_dump_queue_stats_cb
*cb
, void *aux
)
1237 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1238 return (class->dump_queue_stats
1239 ? class->dump_queue_stats(netdev
, cb
, aux
)
1243 /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)),
1244 * sets '*vlan_vid' to the VLAN VID associated with that device and returns 0.
1245 * Otherwise returns a errno value (specifically ENOENT if 'netdev_name' is the
1246 * name of a network device that is not a VLAN device) and sets '*vlan_vid' to
1249 netdev_get_vlan_vid(const struct netdev
*netdev
, int *vlan_vid
)
1251 int error
= (netdev_get_dev(netdev
)->netdev_class
->get_vlan_vid
1252 ? netdev_get_dev(netdev
)->netdev_class
->get_vlan_vid(netdev
,
1261 /* Returns a network device that has 'in4' as its IP address, if one exists,
1262 * otherwise a null pointer. */
1264 netdev_find_dev_by_in4(const struct in_addr
*in4
)
1266 struct netdev
*netdev
;
1267 struct svec dev_list
= SVEC_EMPTY_INITIALIZER
;
1270 netdev_enumerate(&dev_list
);
1271 for (i
= 0; i
< dev_list
.n
; i
++) {
1272 const char *name
= dev_list
.names
[i
];
1273 struct in_addr dev_in4
;
1275 if (!netdev_open_default(name
, &netdev
)
1276 && !netdev_get_in4(netdev
, &dev_in4
, NULL
)
1277 && dev_in4
.s_addr
== in4
->s_addr
) {
1280 netdev_close(netdev
);
1285 svec_destroy(&dev_list
);
1289 /* Initializes 'netdev_dev' as a netdev device named 'name' of the
1290 * specified 'netdev_class'.
1292 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1293 * very important that 'netdev_dev' only be freed after calling
1294 * the refcount drops to zero. */
1296 netdev_dev_init(struct netdev_dev
*netdev_dev
, const char *name
,
1297 const struct netdev_class
*netdev_class
)
1299 assert(!shash_find(&netdev_dev_shash
, name
));
1301 memset(netdev_dev
, 0, sizeof *netdev_dev
);
1302 netdev_dev
->netdev_class
= netdev_class
;
1303 netdev_dev
->name
= xstrdup(name
);
1304 netdev_dev
->node
= shash_add(&netdev_dev_shash
, name
, netdev_dev
);
1307 /* Undoes the results of initialization.
1309 * Normally this function does not need to be called as netdev_close has
1310 * the same effect when the refcount drops to zero.
1311 * However, it may be called by providers due to an error on creation
1312 * that occurs after initialization. It this case netdev_close() would
1313 * never be called. */
1315 netdev_dev_uninit(struct netdev_dev
*netdev_dev
, bool destroy
)
1317 char *name
= netdev_dev
->name
;
1319 assert(!netdev_dev
->ref_cnt
);
1321 shash_delete(&netdev_dev_shash
, netdev_dev
->node
);
1322 update_device_args(netdev_dev
, NULL
);
1325 netdev_dev
->netdev_class
->destroy(netdev_dev
);
1330 /* Returns the class type of 'netdev_dev'.
1332 * The caller must not free the returned value. */
1334 netdev_dev_get_type(const struct netdev_dev
*netdev_dev
)
1336 return netdev_dev
->netdev_class
->type
;
1339 /* Returns the class associated with 'netdev_dev'. */
1340 const struct netdev_class
*
1341 netdev_dev_get_class(const struct netdev_dev
*netdev_dev
)
1343 return netdev_dev
->netdev_class
;
1346 /* Returns the name of 'netdev_dev'.
1348 * The caller must not free the returned value. */
1350 netdev_dev_get_name(const struct netdev_dev
*netdev_dev
)
1352 return netdev_dev
->name
;
1355 /* Returns the netdev_dev with 'name' or NULL if there is none.
1357 * The caller must not free the returned value. */
1359 netdev_dev_from_name(const char *name
)
1361 return shash_find_data(&netdev_dev_shash
, name
);
1364 /* Fills 'device_list' with devices that match 'netdev_class'.
1366 * The caller is responsible for initializing and destroying 'device_list'
1367 * but the contained netdev_devs must not be freed. */
1369 netdev_dev_get_devices(const struct netdev_class
*netdev_class
,
1370 struct shash
*device_list
)
1372 struct shash_node
*node
;
1373 SHASH_FOR_EACH (node
, &netdev_dev_shash
) {
1374 struct netdev_dev
*dev
= node
->data
;
1376 if (dev
->netdev_class
== netdev_class
) {
1377 shash_add(device_list
, node
->name
, node
->data
);
1382 /* Initializes 'netdev' as a instance of the netdev_dev.
1384 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1385 * important that 'netdev' only be freed after calling netdev_close(). */
1387 netdev_init(struct netdev
*netdev
, struct netdev_dev
*netdev_dev
)
1389 memset(netdev
, 0, sizeof *netdev
);
1390 netdev
->netdev_dev
= netdev_dev
;
1391 list_push_back(&netdev_list
, &netdev
->node
);
1394 /* Undoes the results of initialization.
1396 * Normally this function only needs to be called from netdev_close().
1397 * However, it may be called by providers due to an error on opening
1398 * that occurs after initialization. It this case netdev_close() would
1399 * never be called. */
1401 netdev_uninit(struct netdev
*netdev
, bool close
)
1403 /* Restore flags that we changed, if any. */
1404 int error
= restore_flags(netdev
);
1405 list_remove(&netdev
->node
);
1407 VLOG_WARN("failed to restore network device flags on %s: %s",
1408 netdev_get_name(netdev
), strerror(error
));
1412 netdev_get_dev(netdev
)->netdev_class
->close(netdev
);
1417 /* Returns the class type of 'netdev'.
1419 * The caller must not free the returned value. */
1421 netdev_get_type(const struct netdev
*netdev
)
1423 return netdev_get_dev(netdev
)->netdev_class
->type
;
1427 netdev_get_dev(const struct netdev
*netdev
)
1429 return netdev
->netdev_dev
;
1432 /* Initializes 'notifier' as a netdev notifier for 'netdev', for which
1433 * notification will consist of calling 'cb', with auxiliary data 'aux'. */
1435 netdev_notifier_init(struct netdev_notifier
*notifier
, struct netdev
*netdev
,
1436 void (*cb
)(struct netdev_notifier
*), void *aux
)
1438 notifier
->netdev
= netdev
;
1440 notifier
->aux
= aux
;
1443 /* Tracks changes in the status of a set of network devices. */
1444 struct netdev_monitor
{
1445 struct shash polled_netdevs
;
1446 struct shash changed_netdevs
;
1449 /* Creates and returns a new structure for monitor changes in the status of
1450 * network devices. */
1451 struct netdev_monitor
*
1452 netdev_monitor_create(void)
1454 struct netdev_monitor
*monitor
= xmalloc(sizeof *monitor
);
1455 shash_init(&monitor
->polled_netdevs
);
1456 shash_init(&monitor
->changed_netdevs
);
1460 /* Destroys 'monitor'. */
1462 netdev_monitor_destroy(struct netdev_monitor
*monitor
)
1465 struct shash_node
*node
;
1467 SHASH_FOR_EACH (node
, &monitor
->polled_netdevs
) {
1468 struct netdev_notifier
*notifier
= node
->data
;
1469 netdev_get_dev(notifier
->netdev
)->netdev_class
->poll_remove(
1473 shash_destroy(&monitor
->polled_netdevs
);
1474 shash_destroy(&monitor
->changed_netdevs
);
1480 netdev_monitor_cb(struct netdev_notifier
*notifier
)
1482 struct netdev_monitor
*monitor
= notifier
->aux
;
1483 const char *name
= netdev_get_name(notifier
->netdev
);
1484 shash_add_once(&monitor
->changed_netdevs
, name
, NULL
);
1487 /* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if
1488 * successful, otherwise a positive errno value.
1490 * Adding a given 'netdev' to a monitor multiple times is equivalent to adding
1493 netdev_monitor_add(struct netdev_monitor
*monitor
, struct netdev
*netdev
)
1495 const char *netdev_name
= netdev_get_name(netdev
);
1497 if (!shash_find(&monitor
->polled_netdevs
, netdev_name
)
1498 && netdev_get_dev(netdev
)->netdev_class
->poll_add
)
1500 struct netdev_notifier
*notifier
;
1501 error
= netdev_get_dev(netdev
)->netdev_class
->poll_add(netdev
,
1502 netdev_monitor_cb
, monitor
, ¬ifier
);
1504 assert(notifier
->netdev
== netdev
);
1505 shash_add(&monitor
->polled_netdevs
, netdev_name
, notifier
);
1511 /* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has
1512 * no effect if 'netdev' is not in the set of devices monitored by
1515 netdev_monitor_remove(struct netdev_monitor
*monitor
, struct netdev
*netdev
)
1517 const char *netdev_name
= netdev_get_name(netdev
);
1518 struct shash_node
*node
;
1520 node
= shash_find(&monitor
->polled_netdevs
, netdev_name
);
1522 /* Cancel future notifications. */
1523 struct netdev_notifier
*notifier
= node
->data
;
1524 netdev_get_dev(netdev
)->netdev_class
->poll_remove(notifier
);
1525 shash_delete(&monitor
->polled_netdevs
, node
);
1527 /* Drop any pending notification. */
1528 node
= shash_find(&monitor
->changed_netdevs
, netdev_name
);
1530 shash_delete(&monitor
->changed_netdevs
, node
);
1535 /* Checks for changes to netdevs in the set monitored by 'monitor'. If any of
1536 * the attributes (Ethernet address, carrier status, speed or peer-advertised
1537 * speed, flags, etc.) of a network device monitored by 'monitor' has changed,
1538 * sets '*devnamep' to the name of a device that has changed and returns 0.
1539 * The caller is responsible for freeing '*devnamep' (with free()).
1541 * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN. */
1543 netdev_monitor_poll(struct netdev_monitor
*monitor
, char **devnamep
)
1545 struct shash_node
*node
= shash_first(&monitor
->changed_netdevs
);
1550 *devnamep
= shash_steal(&monitor
->changed_netdevs
, node
);
1555 /* Registers with the poll loop to wake up from the next call to poll_block()
1556 * when netdev_monitor_poll(monitor) would indicate that a device has
1559 netdev_monitor_poll_wait(const struct netdev_monitor
*monitor
)
1561 if (!shash_is_empty(&monitor
->changed_netdevs
)) {
1562 poll_immediate_wake();
1564 /* XXX Nothing needed here for netdev_linux, but maybe other netdev
1565 * classes need help. */
1569 /* Restore the network device flags on 'netdev' to those that were active
1570 * before we changed them. Returns 0 if successful, otherwise a positive
1573 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
1575 restore_flags(struct netdev
*netdev
)
1577 if (netdev
->changed_flags
) {
1578 enum netdev_flags restore
= netdev
->save_flags
& netdev
->changed_flags
;
1579 enum netdev_flags old_flags
;
1580 return netdev_get_dev(netdev
)->netdev_class
->update_flags(netdev
,
1581 netdev
->changed_flags
& ~restore
,
1582 restore
, &old_flags
);
1587 /* Close all netdevs on shutdown so they can do any needed cleanup such as
1588 * destroying devices, restoring flags, etc. */
1590 close_all_netdevs(void *aux OVS_UNUSED
)
1592 struct netdev
*netdev
, *next
;
1593 LIST_FOR_EACH_SAFE(netdev
, next
, node
, &netdev_list
) {
1594 netdev_close(netdev
);