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"
35 #include "openflow/openflow.h"
37 #include "poll-loop.h"
42 VLOG_DEFINE_THIS_MODULE(netdev
)
44 static const struct netdev_class
*base_netdev_classes
[] = {
54 static struct shash netdev_classes
= SHASH_INITIALIZER(&netdev_classes
);
56 /* All created network devices. */
57 static struct shash netdev_dev_shash
= SHASH_INITIALIZER(&netdev_dev_shash
);
59 /* All open network devices. */
60 static struct list netdev_list
= LIST_INITIALIZER(&netdev_list
);
62 /* This is set pretty low because we probably won't learn anything from the
63 * additional log messages. */
64 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(5, 20);
66 static void close_all_netdevs(void *aux OVS_UNUSED
);
67 static int restore_flags(struct netdev
*netdev
);
68 void update_device_args(struct netdev_dev
*, const struct shash
*args
);
71 netdev_initialize(void)
73 static int status
= -1;
78 fatal_signal_add_hook(close_all_netdevs
, NULL
, NULL
, true);
81 for (i
= 0; i
< ARRAY_SIZE(base_netdev_classes
); i
++) {
82 netdev_register_provider(base_netdev_classes
[i
]);
87 /* Performs periodic work needed by all the various kinds of netdevs.
89 * If your program opens any netdevs, it must call this function within its
94 struct shash_node
*node
;
95 SHASH_FOR_EACH(node
, &netdev_classes
) {
96 const struct netdev_class
*netdev_class
= node
->data
;
97 if (netdev_class
->run
) {
103 /* Arranges for poll_block() to wake up when netdev_run() needs to be called.
105 * If your program opens any netdevs, it must call this function within its
110 struct shash_node
*node
;
111 SHASH_FOR_EACH(node
, &netdev_classes
) {
112 const struct netdev_class
*netdev_class
= node
->data
;
113 if (netdev_class
->wait
) {
114 netdev_class
->wait();
119 /* Initializes and registers a new netdev provider. After successful
120 * registration, new netdevs of that type can be opened using netdev_open(). */
122 netdev_register_provider(const struct netdev_class
*new_class
)
124 struct netdev_class
*new_provider
;
126 if (shash_find(&netdev_classes
, new_class
->type
)) {
127 VLOG_WARN("attempted to register duplicate netdev provider: %s",
132 if (new_class
->init
) {
133 int error
= new_class
->init();
135 VLOG_ERR("failed to initialize %s network device class: %s",
136 new_class
->type
, strerror(error
));
141 new_provider
= xmalloc(sizeof *new_provider
);
142 memcpy(new_provider
, new_class
, sizeof *new_provider
);
144 shash_add(&netdev_classes
, new_class
->type
, new_provider
);
149 /* Unregisters a netdev provider. 'type' must have been previously
150 * registered and not currently be in use by any netdevs. After unregistration
151 * new netdevs of that type cannot be opened using netdev_open(). */
153 netdev_unregister_provider(const char *type
)
155 struct shash_node
*del_node
, *netdev_dev_node
;
157 del_node
= shash_find(&netdev_classes
, type
);
159 VLOG_WARN("attempted to unregister a netdev provider that is not "
160 "registered: %s", type
);
164 SHASH_FOR_EACH(netdev_dev_node
, &netdev_dev_shash
) {
165 struct netdev_dev
*netdev_dev
= netdev_dev_node
->data
;
166 if (!strcmp(netdev_dev
->netdev_class
->type
, type
)) {
167 VLOG_WARN("attempted to unregister in use netdev provider: %s",
173 shash_delete(&netdev_classes
, del_node
);
174 free(del_node
->data
);
179 /* Clears 'types' and enumerates the types of all currently registered netdev
180 * providers into it. The caller must first initialize the svec. */
182 netdev_enumerate_types(struct svec
*types
)
184 struct shash_node
*node
;
189 SHASH_FOR_EACH(node
, &netdev_classes
) {
190 const struct netdev_class
*netdev_class
= node
->data
;
191 svec_add(types
, netdev_class
->type
);
195 /* Compares 'args' to those used to those used by 'dev'. Returns true
196 * if the arguments are the same, false otherwise. Does not update the
197 * values stored in 'dev'. */
199 compare_device_args(const struct netdev_dev
*dev
, const struct shash
*args
)
201 const struct shash_node
**new_args
;
205 if (shash_count(args
) != dev
->n_args
) {
209 new_args
= shash_sort(args
);
210 for (i
= 0; i
< dev
->n_args
; i
++) {
211 if (strcmp(dev
->args
[i
].key
, new_args
[i
]->name
) ||
212 strcmp(dev
->args
[i
].value
, new_args
[i
]->data
)) {
224 compare_args(const void *a_
, const void *b_
)
226 const struct arg
*a
= a_
;
227 const struct arg
*b
= b_
;
228 return strcmp(a
->key
, b
->key
);
232 update_device_args(struct netdev_dev
*dev
, const struct shash
*args
)
234 struct shash_node
*node
;
238 for (i
= 0; i
< dev
->n_args
; i
++) {
239 free(dev
->args
[i
].key
);
240 free(dev
->args
[i
].value
);
247 if (!args
|| shash_is_empty(args
)) {
251 dev
->n_args
= shash_count(args
);
252 dev
->args
= xmalloc(dev
->n_args
* sizeof *dev
->args
);
255 SHASH_FOR_EACH(node
, args
) {
256 dev
->args
[i
].key
= xstrdup(node
->name
);
257 dev
->args
[i
].value
= xstrdup(node
->data
);
261 qsort(dev
->args
, dev
->n_args
, sizeof *dev
->args
, compare_args
);
265 create_device(struct netdev_options
*options
, struct netdev_dev
**netdev_devp
)
267 struct netdev_class
*netdev_class
;
269 if (!options
->type
|| strlen(options
->type
) == 0) {
270 /* Default to system. */
271 options
->type
= "system";
274 netdev_class
= shash_find_data(&netdev_classes
, options
->type
);
279 return netdev_class
->create(options
->name
, options
->type
, options
->args
,
283 /* Opens the network device named 'name' (e.g. "eth0") and returns zero if
284 * successful, otherwise a positive errno value. On success, sets '*netdevp'
285 * to the new network device, otherwise to null.
287 * If this is the first time the device has been opened, then create is called
288 * before opening. The device is created using the given type and arguments.
290 * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to
291 * capture frames of that type received on the device. It may also be one of
292 * the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
296 netdev_open(struct netdev_options
*options
, struct netdev
**netdevp
)
298 struct shash empty_args
= SHASH_INITIALIZER(&empty_args
);
299 struct netdev_dev
*netdev_dev
;
305 if (!options
->args
) {
306 options
->args
= &empty_args
;
309 netdev_dev
= shash_find_data(&netdev_dev_shash
, options
->name
);
312 error
= create_device(options
, &netdev_dev
);
314 if (error
== EAFNOSUPPORT
) {
315 VLOG_WARN("could not create netdev %s of unknown type %s",
316 options
->name
, options
->type
);
320 update_device_args(netdev_dev
, options
->args
);
322 } else if (!shash_is_empty(options
->args
) &&
323 !compare_device_args(netdev_dev
, options
->args
)) {
325 VLOG_WARN("%s: attempted to open already open netdev with "
326 "different arguments", options
->name
);
330 error
= netdev_dev
->netdev_class
->open(netdev_dev
, options
->ethertype
,
334 netdev_dev
->ref_cnt
++;
336 if (!netdev_dev
->ref_cnt
) {
337 netdev_dev_uninit(netdev_dev
, true);
345 netdev_open_default(const char *name
, struct netdev
**netdevp
)
347 struct netdev_options options
;
349 memset(&options
, 0, sizeof options
);
351 options
.ethertype
= NETDEV_ETH_TYPE_NONE
;
353 return netdev_open(&options
, netdevp
);
356 /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
357 * or NULL if none are needed. */
359 netdev_reconfigure(struct netdev
*netdev
, const struct shash
*args
)
361 struct shash empty_args
= SHASH_INITIALIZER(&empty_args
);
362 struct netdev_dev
*netdev_dev
= netdev_get_dev(netdev
);
368 if (netdev_dev
->netdev_class
->reconfigure
) {
369 if (!compare_device_args(netdev_dev
, args
)) {
370 update_device_args(netdev_dev
, args
);
371 return netdev_dev
->netdev_class
->reconfigure(netdev_dev
, args
);
373 } else if (!shash_is_empty(args
)) {
374 VLOG_WARN("%s: arguments provided to device that does not have a "
375 "reconfigure function", netdev_get_name(netdev
));
381 /* Closes and destroys 'netdev'. */
383 netdev_close(struct netdev
*netdev
)
386 struct netdev_dev
*netdev_dev
= netdev_get_dev(netdev
);
388 assert(netdev_dev
->ref_cnt
);
389 netdev_dev
->ref_cnt
--;
390 netdev_uninit(netdev
, true);
392 /* If the reference count for the netdev device is zero, destroy it. */
393 if (!netdev_dev
->ref_cnt
) {
394 netdev_dev_uninit(netdev_dev
, true);
399 /* Returns true if a network device named 'name' exists and may be opened,
400 * otherwise false. */
402 netdev_exists(const char *name
)
404 struct netdev
*netdev
;
407 error
= netdev_open_default(name
, &netdev
);
409 netdev_close(netdev
);
412 if (error
!= ENODEV
) {
413 VLOG_WARN("failed to open network device %s: %s",
414 name
, strerror(error
));
420 /* Returns true if a network device named 'name' is currently opened,
421 * otherwise false. */
423 netdev_is_open(const char *name
)
425 return !!shash_find_data(&netdev_dev_shash
, name
);
428 /* Clears 'svec' and enumerates the names of all known network devices. */
430 netdev_enumerate(struct svec
*svec
)
432 struct shash_node
*node
;
438 SHASH_FOR_EACH(node
, &netdev_classes
) {
439 const struct netdev_class
*netdev_class
= node
->data
;
440 if (netdev_class
->enumerate
) {
441 int retval
= netdev_class
->enumerate(svec
);
443 VLOG_WARN("failed to enumerate %s network devices: %s",
444 netdev_class
->type
, strerror(retval
));
455 /* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
456 * must have initialized with sufficient room for the packet. The space
457 * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
458 * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
459 * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
460 * need not be included.)
462 * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
463 * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
464 * positive errno value. Returns EAGAIN immediately if no packet is ready to
467 * Some network devices may not implement support for this function. In such
468 * cases this function will always return EOPNOTSUPP.
471 netdev_recv(struct netdev
*netdev
, struct ofpbuf
*buffer
)
473 int (*recv
)(struct netdev
*, void *, size_t);
476 assert(buffer
->size
== 0);
477 assert(ofpbuf_tailroom(buffer
) >= ETH_TOTAL_MIN
);
479 recv
= netdev_get_dev(netdev
)->netdev_class
->recv
;
481 ? (recv
)(netdev
, buffer
->data
, ofpbuf_tailroom(buffer
))
484 COVERAGE_INC(netdev_received
);
485 buffer
->size
+= retval
;
486 if (buffer
->size
< ETH_TOTAL_MIN
) {
487 ofpbuf_put_zeros(buffer
, ETH_TOTAL_MIN
- buffer
->size
);
495 /* Registers with the poll loop to wake up from the next call to poll_block()
496 * when a packet is ready to be received with netdev_recv() on 'netdev'. */
498 netdev_recv_wait(struct netdev
*netdev
)
500 void (*recv_wait
)(struct netdev
*);
502 recv_wait
= netdev_get_dev(netdev
)->netdev_class
->recv_wait
;
508 /* Discards all packets waiting to be received from 'netdev'. */
510 netdev_drain(struct netdev
*netdev
)
512 int (*drain
)(struct netdev
*);
514 drain
= netdev_get_dev(netdev
)->netdev_class
->drain
;
515 return drain
? drain(netdev
) : 0;
518 /* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
519 * errno value. Returns EAGAIN without blocking if the packet cannot be queued
520 * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
521 * the packet is too big or too small to transmit on the device.
523 * The caller retains ownership of 'buffer' in all cases.
525 * The kernel maintains a packet transmission queue, so the caller is not
526 * expected to do additional queuing of packets.
528 * Some network devices may not implement support for this function. In such
529 * cases this function will always return EOPNOTSUPP. */
531 netdev_send(struct netdev
*netdev
, const struct ofpbuf
*buffer
)
533 int (*send
)(struct netdev
*, const void *, size_t);
536 send
= netdev_get_dev(netdev
)->netdev_class
->send
;
537 error
= send
? (send
)(netdev
, buffer
->data
, buffer
->size
) : EOPNOTSUPP
;
539 COVERAGE_INC(netdev_sent
);
544 /* Registers with the poll loop to wake up from the next call to poll_block()
545 * when the packet transmission queue has sufficient room to transmit a packet
546 * with netdev_send().
548 * The kernel maintains a packet transmission queue, so the client is not
549 * expected to do additional queuing of packets. Thus, this function is
550 * unlikely to ever be used. It is included for completeness. */
552 netdev_send_wait(struct netdev
*netdev
)
554 void (*send_wait
)(struct netdev
*);
556 send_wait
= netdev_get_dev(netdev
)->netdev_class
->send_wait
;
562 /* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
563 * otherwise a positive errno value. */
565 netdev_set_etheraddr(struct netdev
*netdev
, const uint8_t mac
[ETH_ADDR_LEN
])
567 return netdev_get_dev(netdev
)->netdev_class
->set_etheraddr(netdev
, mac
);
570 /* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
571 * the MAC address into 'mac'. On failure, returns a positive errno value and
572 * clears 'mac' to all-zeros. */
574 netdev_get_etheraddr(const struct netdev
*netdev
, uint8_t mac
[ETH_ADDR_LEN
])
576 return netdev_get_dev(netdev
)->netdev_class
->get_etheraddr(netdev
, mac
);
579 /* Returns the name of the network device that 'netdev' represents,
580 * e.g. "eth0". The caller must not modify or free the returned string. */
582 netdev_get_name(const struct netdev
*netdev
)
584 return netdev_get_dev(netdev
)->name
;
587 /* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
588 * (and received) packets, in bytes, not including the hardware header; thus,
589 * this is typically 1500 bytes for Ethernet devices.
591 * If successful, returns 0 and stores the MTU size in '*mtup'. On failure,
592 * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in
595 netdev_get_mtu(const struct netdev
*netdev
, int *mtup
)
597 int error
= netdev_get_dev(netdev
)->netdev_class
->get_mtu(netdev
, mtup
);
599 VLOG_WARN_RL(&rl
, "failed to retrieve MTU for network device %s: %s",
600 netdev_get_name(netdev
), strerror(error
));
601 *mtup
= ETH_PAYLOAD_MAX
;
606 /* Returns the ifindex of 'netdev', if successful, as a positive number. On
607 * failure, returns a negative errno value.
609 * The desired semantics of the ifindex value are a combination of those
610 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
611 * value should be unique within a host and remain stable at least until
612 * reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
613 * but many systems do not follow this rule anyhow.
615 * Some network devices may not implement support for this function. In such
616 * cases this function will always return -EOPNOTSUPP.
619 netdev_get_ifindex(const struct netdev
*netdev
)
621 int (*get_ifindex
)(const struct netdev
*);
623 get_ifindex
= netdev_get_dev(netdev
)->netdev_class
->get_ifindex
;
625 return get_ifindex
? get_ifindex(netdev
) : -EOPNOTSUPP
;
628 /* Stores the features supported by 'netdev' into each of '*current',
629 * '*advertised', '*supported', and '*peer' that are non-null. Each value is a
630 * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
631 * successful, otherwise a positive errno value. On failure, all of the
632 * passed-in values are set to 0.
634 * Some network devices may not implement support for this function. In such
635 * cases this function will always return EOPNOTSUPP.
638 netdev_get_features(struct netdev
*netdev
,
639 uint32_t *current
, uint32_t *advertised
,
640 uint32_t *supported
, uint32_t *peer
)
642 int (*get_features
)(struct netdev
*netdev
,
643 uint32_t *current
, uint32_t *advertised
,
644 uint32_t *supported
, uint32_t *peer
);
652 advertised
= &dummy
[1];
655 supported
= &dummy
[2];
661 get_features
= netdev_get_dev(netdev
)->netdev_class
->get_features
;
663 ? get_features(netdev
, current
, advertised
, supported
, peer
)
666 *current
= *advertised
= *supported
= *peer
= 0;
671 /* Returns the maximum speed of a network connection that has the "enum
672 * ofp_port_features" bits in 'features', in bits per second. If no bits that
673 * indicate a speed are set in 'features', assumes 100Mbps. */
675 netdev_features_to_bps(uint32_t features
)
678 F_10000MB
= OFPPF_10GB_FD
,
679 F_1000MB
= OFPPF_1GB_HD
| OFPPF_1GB_FD
,
680 F_100MB
= OFPPF_100MB_HD
| OFPPF_100MB_FD
,
681 F_10MB
= OFPPF_10MB_HD
| OFPPF_10MB_FD
684 return ( features
& F_10000MB
? UINT64_C(10000000000)
685 : features
& F_1000MB
? UINT64_C(1000000000)
686 : features
& F_100MB
? UINT64_C(100000000)
687 : features
& F_10MB
? UINT64_C(10000000)
688 : UINT64_C(100000000));
691 /* Returns true if any of the "enum ofp_port_features" bits that indicate a
692 * full-duplex link are set in 'features', otherwise false. */
694 netdev_features_is_full_duplex(uint32_t features
)
696 return (features
& (OFPPF_10MB_FD
| OFPPF_100MB_FD
| OFPPF_1GB_FD
697 | OFPPF_10GB_FD
)) != 0;
700 /* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
701 * successful, otherwise a positive errno value. */
703 netdev_set_advertisements(struct netdev
*netdev
, uint32_t advertise
)
705 return (netdev_get_dev(netdev
)->netdev_class
->set_advertisements
706 ? netdev_get_dev(netdev
)->netdev_class
->set_advertisements(
711 /* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
712 * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
713 * errno value and sets '*address' to 0 (INADDR_ANY).
715 * The following error values have well-defined meanings:
717 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
719 * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
721 * 'address' or 'netmask' or both may be null, in which case the address or netmask
722 * is not reported. */
724 netdev_get_in4(const struct netdev
*netdev
,
725 struct in_addr
*address_
, struct in_addr
*netmask_
)
727 struct in_addr address
;
728 struct in_addr netmask
;
731 error
= (netdev_get_dev(netdev
)->netdev_class
->get_in4
732 ? netdev_get_dev(netdev
)->netdev_class
->get_in4(netdev
,
736 address_
->s_addr
= error
? 0 : address
.s_addr
;
739 netmask_
->s_addr
= error
? 0 : netmask
.s_addr
;
744 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
745 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
746 * positive errno value. */
748 netdev_set_in4(struct netdev
*netdev
, struct in_addr addr
, struct in_addr mask
)
750 return (netdev_get_dev(netdev
)->netdev_class
->set_in4
751 ? netdev_get_dev(netdev
)->netdev_class
->set_in4(netdev
, addr
, mask
)
755 /* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
758 netdev_add_router(struct netdev
*netdev
, struct in_addr router
)
760 COVERAGE_INC(netdev_add_router
);
761 return (netdev_get_dev(netdev
)->netdev_class
->add_router
762 ? netdev_get_dev(netdev
)->netdev_class
->add_router(netdev
, router
)
766 /* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
767 * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
768 * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
769 * next hop is found, stores the next hop gateway's address (0 if 'host' is on
770 * a directly connected network) in '*next_hop' and a copy of the name of the
771 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
772 * responsible for freeing '*netdev_name' (by calling free()). */
774 netdev_get_next_hop(const struct netdev
*netdev
,
775 const struct in_addr
*host
, struct in_addr
*next_hop
,
778 int error
= (netdev_get_dev(netdev
)->netdev_class
->get_next_hop
779 ? netdev_get_dev(netdev
)->netdev_class
->get_next_hop(
780 host
, next_hop
, netdev_name
)
783 next_hop
->s_addr
= 0;
789 /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
790 * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
791 * all-zero-bits (in6addr_any).
793 * The following error values have well-defined meanings:
795 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
797 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
799 * 'in6' may be null, in which case the address itself is not reported. */
801 netdev_get_in6(const struct netdev
*netdev
, struct in6_addr
*in6
)
803 struct in6_addr dummy
;
806 error
= (netdev_get_dev(netdev
)->netdev_class
->get_in6
807 ? netdev_get_dev(netdev
)->netdev_class
->get_in6(netdev
,
811 memset(in6
, 0, sizeof *in6
);
816 /* On 'netdev', turns off the flags in 'off' and then turns on the flags in
817 * 'on'. If 'permanent' is true, the changes will persist; otherwise, they
818 * will be reverted when 'netdev' is closed or the program exits. Returns 0 if
819 * successful, otherwise a positive errno value. */
821 do_update_flags(struct netdev
*netdev
, enum netdev_flags off
,
822 enum netdev_flags on
, enum netdev_flags
*old_flagsp
,
825 enum netdev_flags old_flags
;
828 error
= netdev_get_dev(netdev
)->netdev_class
->update_flags(netdev
,
829 off
& ~on
, on
, &old_flags
);
831 VLOG_WARN_RL(&rl
, "failed to %s flags for network device %s: %s",
832 off
|| on
? "set" : "get", netdev_get_name(netdev
),
835 } else if ((off
|| on
) && !permanent
) {
836 enum netdev_flags new_flags
= (old_flags
& ~off
) | on
;
837 enum netdev_flags changed_flags
= old_flags
^ new_flags
;
839 if (!netdev
->changed_flags
) {
840 netdev
->save_flags
= old_flags
;
842 netdev
->changed_flags
|= changed_flags
;
846 *old_flagsp
= old_flags
;
851 /* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
852 * Returns 0 if successful, otherwise a positive errno value. On failure,
853 * stores 0 into '*flagsp'. */
855 netdev_get_flags(const struct netdev
*netdev_
, enum netdev_flags
*flagsp
)
857 struct netdev
*netdev
= (struct netdev
*) netdev_
;
858 return do_update_flags(netdev
, 0, 0, flagsp
, false);
861 /* Sets the flags for 'netdev' to 'flags'.
862 * If 'permanent' is true, the changes will persist; otherwise, they
863 * will be reverted when 'netdev' is closed or the program exits.
864 * Returns 0 if successful, otherwise a positive errno value. */
866 netdev_set_flags(struct netdev
*netdev
, enum netdev_flags flags
,
869 return do_update_flags(netdev
, -1, flags
, NULL
, permanent
);
872 /* Turns on the specified 'flags' on 'netdev'.
873 * If 'permanent' is true, the changes will persist; otherwise, they
874 * will be reverted when 'netdev' is closed or the program exits.
875 * Returns 0 if successful, otherwise a positive errno value. */
877 netdev_turn_flags_on(struct netdev
*netdev
, enum netdev_flags flags
,
880 return do_update_flags(netdev
, 0, flags
, NULL
, permanent
);
883 /* Turns off the specified 'flags' on 'netdev'.
884 * If 'permanent' is true, the changes will persist; otherwise, they
885 * will be reverted when 'netdev' is closed or the program exits.
886 * Returns 0 if successful, otherwise a positive errno value. */
888 netdev_turn_flags_off(struct netdev
*netdev
, enum netdev_flags flags
,
891 return do_update_flags(netdev
, flags
, 0, NULL
, permanent
);
894 /* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
895 * successfully retrieved, it stores the corresponding MAC address in 'mac' and
896 * returns 0. Otherwise, it returns a positive errno value; in particular,
897 * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
899 netdev_arp_lookup(const struct netdev
*netdev
,
900 uint32_t ip
, uint8_t mac
[ETH_ADDR_LEN
])
902 int error
= (netdev_get_dev(netdev
)->netdev_class
->arp_lookup
903 ? netdev_get_dev(netdev
)->netdev_class
->arp_lookup(netdev
,
907 memset(mac
, 0, ETH_ADDR_LEN
);
912 /* Sets 'carrier' to true if carrier is active (link light is on) on
915 netdev_get_carrier(const struct netdev
*netdev
, bool *carrier
)
917 int error
= (netdev_get_dev(netdev
)->netdev_class
->get_carrier
918 ? netdev_get_dev(netdev
)->netdev_class
->get_carrier(netdev
,
927 /* Retrieves current device stats for 'netdev'. */
929 netdev_get_stats(const struct netdev
*netdev
, struct netdev_stats
*stats
)
933 COVERAGE_INC(netdev_get_stats
);
934 error
= (netdev_get_dev(netdev
)->netdev_class
->get_stats
935 ? netdev_get_dev(netdev
)->netdev_class
->get_stats(netdev
, stats
)
938 memset(stats
, 0xff, sizeof *stats
);
943 /* Attempts to change the stats for 'netdev' to those provided in 'stats'.
944 * Returns 0 if successful, otherwise a positive errno value.
946 * This will probably fail for most network devices. Some devices might only
947 * allow setting their stats to 0. */
949 netdev_set_stats(struct netdev
*netdev
, const struct netdev_stats
*stats
)
951 return (netdev_get_dev(netdev
)->netdev_class
->set_stats
952 ? netdev_get_dev(netdev
)->netdev_class
->set_stats(netdev
, stats
)
956 /* Attempts to set input rate limiting (policing) policy, such that up to
957 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
958 * size of 'kbits' kb. */
960 netdev_set_policing(struct netdev
*netdev
, uint32_t kbits_rate
,
961 uint32_t kbits_burst
)
963 return (netdev_get_dev(netdev
)->netdev_class
->set_policing
964 ? netdev_get_dev(netdev
)->netdev_class
->set_policing(netdev
,
965 kbits_rate
, kbits_burst
)
969 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
970 * empty if 'netdev' does not support QoS. Any names added to 'types' should
971 * be documented as valid for the "type" column in the "QoS" table in
972 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
974 * Every network device supports disabling QoS with a type of "", but this type
975 * will not be added to 'types'.
977 * The caller must initialize 'types' (e.g. with svec_init()) before calling
978 * this function. The caller is responsible for destroying 'types' (e.g. with
979 * svec_destroy()) when it is no longer needed.
981 * Returns 0 if successful, otherwise a positive errno value. */
983 netdev_get_qos_types(const struct netdev
*netdev
, struct svec
*types
)
985 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
986 return (class->get_qos_types
987 ? class->get_qos_types(netdev
, types
)
991 /* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
992 * which should be "" or one of the types returned by netdev_get_qos_types()
993 * for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
994 * On success, initializes 'caps' with the QoS capabilities; on failure, clears
995 * 'caps' to all zeros. */
997 netdev_get_qos_capabilities(const struct netdev
*netdev
, const char *type
,
998 struct netdev_qos_capabilities
*caps
)
1000 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1003 int retval
= (class->get_qos_capabilities
1004 ? class->get_qos_capabilities(netdev
, type
, caps
)
1007 memset(caps
, 0, sizeof *caps
);
1011 /* Every netdev supports turning off QoS. */
1012 memset(caps
, 0, sizeof *caps
);
1017 /* Obtains the number of queues supported by 'netdev' for the specified 'type'
1018 * of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
1019 * the number of queues (zero on failure) in '*n_queuesp'.
1021 * This is just a simple wrapper around netdev_get_qos_capabilities(). */
1023 netdev_get_n_queues(const struct netdev
*netdev
,
1024 const char *type
, unsigned int *n_queuesp
)
1026 struct netdev_qos_capabilities caps
;
1029 retval
= netdev_get_qos_capabilities(netdev
, type
, &caps
);
1030 *n_queuesp
= caps
.n_queues
;
1034 /* Queries 'netdev' about its currently configured form of QoS. If successful,
1035 * stores the name of the current form of QoS into '*typep', stores any details
1036 * of configuration as string key-value pairs in 'details', and returns 0. On
1037 * failure, sets '*typep' to NULL and returns a positive errno value.
1039 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
1041 * The caller must initialize 'details' as an empty shash (e.g. with
1042 * shash_init()) before calling this function. The caller must free 'details',
1043 * including 'data' members, when it is no longer needed (e.g. with
1044 * shash_destroy_free_data()).
1046 * The caller must not modify or free '*typep'.
1048 * '*typep' will be one of the types returned by netdev_get_qos_types() for
1049 * 'netdev'. The contents of 'details' should be documented as valid for
1050 * '*typep' in the "other_config" column in the "QoS" table in
1051 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
1053 netdev_get_qos(const struct netdev
*netdev
,
1054 const char **typep
, struct shash
*details
)
1056 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1059 if (class->get_qos
) {
1060 retval
= class->get_qos(netdev
, typep
, details
);
1063 shash_clear_free_data(details
);
1067 /* 'netdev' doesn't support QoS, so report that QoS is disabled. */
1073 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
1074 * with details of configuration from 'details'. Returns 0 if successful,
1075 * otherwise a positive errno value. On error, the previous QoS configuration
1078 * When this function changes the type of QoS (not just 'details'), this also
1079 * resets all queue configuration for 'netdev' to their defaults (which depend
1080 * on the specific type of QoS). Otherwise, the queue configuration for
1081 * 'netdev' is unchanged.
1083 * 'type' should be "" (to disable QoS) or one of the types returned by
1084 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
1085 * documented as valid for the given 'type' in the "other_config" column in the
1086 * "QoS" table in vswitchd/vswitch.xml (which is built as
1087 * ovs-vswitchd.conf.db(8)).
1089 * NULL may be specified for 'details' if there are no configuration
1092 netdev_set_qos(struct netdev
*netdev
,
1093 const char *type
, const struct shash
*details
)
1095 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1101 if (class->set_qos
) {
1103 static struct shash empty
= SHASH_INITIALIZER(&empty
);
1106 return class->set_qos(netdev
, type
, details
);
1108 return *type
? EOPNOTSUPP
: 0;
1112 /* Queries 'netdev' for information about the queue numbered 'queue_id'. If
1113 * successful, adds that information as string key-value pairs to 'details'.
1114 * Returns 0 if successful, otherwise a positive errno value.
1116 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1117 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1119 * The returned contents of 'details' should be documented as valid for the
1120 * given 'type' in the "other_config" column in the "Queue" table in
1121 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1123 * The caller must initialize 'details' (e.g. with shash_init()) before calling
1124 * this function. The caller must free 'details', including 'data' members,
1125 * when it is no longer needed (e.g. with shash_destroy_free_data()). */
1127 netdev_get_queue(const struct netdev
*netdev
,
1128 unsigned int queue_id
, struct shash
*details
)
1130 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1133 retval
= (class->get_queue
1134 ? class->get_queue(netdev
, queue_id
, details
)
1137 shash_clear_free_data(details
);
1142 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
1143 * string pairs in 'details'. The contents of 'details' should be documented
1144 * as valid for the given 'type' in the "other_config" column in the "Queue"
1145 * table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
1146 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1147 * given queue's configuration should be unmodified.
1149 * 'queue_id' must be less than the number of queues supported by 'netdev' for
1150 * the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
1152 * This function does not modify 'details', and the caller retains ownership of
1156 netdev_set_queue(struct netdev
*netdev
,
1157 unsigned int queue_id
, const struct shash
*details
)
1159 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1160 return (class->set_queue
1161 ? class->set_queue(netdev
, queue_id
, details
)
1165 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
1166 * of QoS may have a fixed set of queues, in which case attempts to delete them
1167 * will fail with EOPNOTSUPP.
1169 * Returns 0 if successful, otherwise a positive errno value. On failure, the
1170 * given queue will be unmodified.
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
1174 * netdev_get_n_queues(netdev)). */
1176 netdev_delete_queue(struct netdev
*netdev
, unsigned int queue_id
)
1178 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1179 return (class->delete_queue
1180 ? class->delete_queue(netdev
, queue_id
)
1184 /* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
1185 * fills 'stats' with the queue's statistics; individual members of 'stats' may
1186 * be set to all-1-bits if the statistic is unavailable. On failure, returns a
1187 * positive errno value and fills 'stats' with all-1-bits. */
1189 netdev_get_queue_stats(const struct netdev
*netdev
, unsigned int queue_id
,
1190 struct netdev_queue_stats
*stats
)
1192 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1195 retval
= (class->get_queue_stats
1196 ? class->get_queue_stats(netdev
, queue_id
, stats
)
1199 memset(stats
, 0xff, sizeof *stats
);
1204 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1205 * its configuration, and the 'aux' specified by the caller. The order of
1206 * iteration is unspecified, but (when successful) each queue is visited
1209 * Calling this function may be more efficient than calling netdev_get_queue()
1212 * 'cb' must not modify or free the 'details' argument passed in.
1214 * Returns 0 if successful, otherwise a positive errno value. On error, some
1215 * configured queues may not have been included in the iteration. */
1217 netdev_dump_queues(const struct netdev
*netdev
,
1218 netdev_dump_queues_cb
*cb
, void *aux
)
1220 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1221 return (class->dump_queues
1222 ? class->dump_queues(netdev
, cb
, aux
)
1226 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
1227 * its statistics, and the 'aux' specified by the caller. The order of
1228 * iteration is unspecified, but (when successful) each queue is visited
1231 * Calling this function may be more efficient than calling
1232 * netdev_get_queue_stats() for every queue.
1234 * 'cb' must not modify or free the statistics passed in.
1236 * Returns 0 if successful, otherwise a positive errno value. On error, some
1237 * configured queues may not have been included in the iteration. */
1239 netdev_dump_queue_stats(const struct netdev
*netdev
,
1240 netdev_dump_queue_stats_cb
*cb
, void *aux
)
1242 const struct netdev_class
*class = netdev_get_dev(netdev
)->netdev_class
;
1243 return (class->dump_queue_stats
1244 ? class->dump_queue_stats(netdev
, cb
, aux
)
1248 /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)),
1249 * sets '*vlan_vid' to the VLAN VID associated with that device and returns 0.
1250 * Otherwise returns a errno value (specifically ENOENT if 'netdev_name' is the
1251 * name of a network device that is not a VLAN device) and sets '*vlan_vid' to
1254 netdev_get_vlan_vid(const struct netdev
*netdev
, int *vlan_vid
)
1256 int error
= (netdev_get_dev(netdev
)->netdev_class
->get_vlan_vid
1257 ? netdev_get_dev(netdev
)->netdev_class
->get_vlan_vid(netdev
,
1266 /* Returns a network device that has 'in4' as its IP address, if one exists,
1267 * otherwise a null pointer. */
1269 netdev_find_dev_by_in4(const struct in_addr
*in4
)
1271 struct netdev
*netdev
;
1272 struct svec dev_list
= SVEC_EMPTY_INITIALIZER
;
1275 netdev_enumerate(&dev_list
);
1276 for (i
= 0; i
< dev_list
.n
; i
++) {
1277 const char *name
= dev_list
.names
[i
];
1278 struct in_addr dev_in4
;
1280 if (!netdev_open_default(name
, &netdev
)
1281 && !netdev_get_in4(netdev
, &dev_in4
, NULL
)
1282 && dev_in4
.s_addr
== in4
->s_addr
) {
1285 netdev_close(netdev
);
1290 svec_destroy(&dev_list
);
1294 /* Initializes 'netdev_dev' as a netdev device named 'name' of the
1295 * specified 'netdev_class'.
1297 * This function adds 'netdev_dev' to a netdev-owned shash, so it is
1298 * very important that 'netdev_dev' only be freed after calling
1299 * the refcount drops to zero. */
1301 netdev_dev_init(struct netdev_dev
*netdev_dev
, const char *name
,
1302 const struct netdev_class
*netdev_class
)
1304 assert(!shash_find(&netdev_dev_shash
, name
));
1306 memset(netdev_dev
, 0, sizeof *netdev_dev
);
1307 netdev_dev
->netdev_class
= netdev_class
;
1308 netdev_dev
->name
= xstrdup(name
);
1309 netdev_dev
->node
= shash_add(&netdev_dev_shash
, name
, netdev_dev
);
1312 /* Undoes the results of initialization.
1314 * Normally this function does not need to be called as netdev_close has
1315 * the same effect when the refcount drops to zero.
1316 * However, it may be called by providers due to an error on creation
1317 * that occurs after initialization. It this case netdev_close() would
1318 * never be called. */
1320 netdev_dev_uninit(struct netdev_dev
*netdev_dev
, bool destroy
)
1322 char *name
= netdev_dev
->name
;
1324 assert(!netdev_dev
->ref_cnt
);
1326 shash_delete(&netdev_dev_shash
, netdev_dev
->node
);
1327 update_device_args(netdev_dev
, NULL
);
1330 netdev_dev
->netdev_class
->destroy(netdev_dev
);
1335 /* Returns the class type of 'netdev_dev'.
1337 * The caller must not free the returned value. */
1339 netdev_dev_get_type(const struct netdev_dev
*netdev_dev
)
1341 return netdev_dev
->netdev_class
->type
;
1344 /* Returns the class associated with 'netdev_dev'. */
1345 const struct netdev_class
*
1346 netdev_dev_get_class(const struct netdev_dev
*netdev_dev
)
1348 return netdev_dev
->netdev_class
;
1351 /* Returns the name of 'netdev_dev'.
1353 * The caller must not free the returned value. */
1355 netdev_dev_get_name(const struct netdev_dev
*netdev_dev
)
1357 return netdev_dev
->name
;
1360 /* Returns the netdev_dev with 'name' or NULL if there is none.
1362 * The caller must not free the returned value. */
1364 netdev_dev_from_name(const char *name
)
1366 return shash_find_data(&netdev_dev_shash
, name
);
1369 /* Fills 'device_list' with devices that match 'netdev_class'.
1371 * The caller is responsible for initializing and destroying 'device_list'
1372 * but the contained netdev_devs must not be freed. */
1374 netdev_dev_get_devices(const struct netdev_class
*netdev_class
,
1375 struct shash
*device_list
)
1377 struct shash_node
*node
;
1378 SHASH_FOR_EACH (node
, &netdev_dev_shash
) {
1379 struct netdev_dev
*dev
= node
->data
;
1381 if (dev
->netdev_class
== netdev_class
) {
1382 shash_add(device_list
, node
->name
, node
->data
);
1387 /* Initializes 'netdev' as a instance of the netdev_dev.
1389 * This function adds 'netdev' to a netdev-owned linked list, so it is very
1390 * important that 'netdev' only be freed after calling netdev_close(). */
1392 netdev_init(struct netdev
*netdev
, struct netdev_dev
*netdev_dev
)
1394 memset(netdev
, 0, sizeof *netdev
);
1395 netdev
->netdev_dev
= netdev_dev
;
1396 list_push_back(&netdev_list
, &netdev
->node
);
1399 /* Undoes the results of initialization.
1401 * Normally this function only needs to be called from netdev_close().
1402 * However, it may be called by providers due to an error on opening
1403 * that occurs after initialization. It this case netdev_close() would
1404 * never be called. */
1406 netdev_uninit(struct netdev
*netdev
, bool close
)
1408 /* Restore flags that we changed, if any. */
1409 int error
= restore_flags(netdev
);
1410 list_remove(&netdev
->node
);
1412 VLOG_WARN("failed to restore network device flags on %s: %s",
1413 netdev_get_name(netdev
), strerror(error
));
1417 netdev_get_dev(netdev
)->netdev_class
->close(netdev
);
1422 /* Returns the class type of 'netdev'.
1424 * The caller must not free the returned value. */
1426 netdev_get_type(const struct netdev
*netdev
)
1428 return netdev_get_dev(netdev
)->netdev_class
->type
;
1432 netdev_get_dev(const struct netdev
*netdev
)
1434 return netdev
->netdev_dev
;
1437 /* Initializes 'notifier' as a netdev notifier for 'netdev', for which
1438 * notification will consist of calling 'cb', with auxiliary data 'aux'. */
1440 netdev_notifier_init(struct netdev_notifier
*notifier
, struct netdev
*netdev
,
1441 void (*cb
)(struct netdev_notifier
*), void *aux
)
1443 notifier
->netdev
= netdev
;
1445 notifier
->aux
= aux
;
1448 /* Tracks changes in the status of a set of network devices. */
1449 struct netdev_monitor
{
1450 struct shash polled_netdevs
;
1451 struct shash changed_netdevs
;
1454 /* Creates and returns a new structure for monitor changes in the status of
1455 * network devices. */
1456 struct netdev_monitor
*
1457 netdev_monitor_create(void)
1459 struct netdev_monitor
*monitor
= xmalloc(sizeof *monitor
);
1460 shash_init(&monitor
->polled_netdevs
);
1461 shash_init(&monitor
->changed_netdevs
);
1465 /* Destroys 'monitor'. */
1467 netdev_monitor_destroy(struct netdev_monitor
*monitor
)
1470 struct shash_node
*node
;
1472 SHASH_FOR_EACH (node
, &monitor
->polled_netdevs
) {
1473 struct netdev_notifier
*notifier
= node
->data
;
1474 netdev_get_dev(notifier
->netdev
)->netdev_class
->poll_remove(
1478 shash_destroy(&monitor
->polled_netdevs
);
1479 shash_destroy(&monitor
->changed_netdevs
);
1485 netdev_monitor_cb(struct netdev_notifier
*notifier
)
1487 struct netdev_monitor
*monitor
= notifier
->aux
;
1488 const char *name
= netdev_get_name(notifier
->netdev
);
1489 shash_add_once(&monitor
->changed_netdevs
, name
, NULL
);
1492 /* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if
1493 * successful, otherwise a positive errno value.
1495 * Adding a given 'netdev' to a monitor multiple times is equivalent to adding
1498 netdev_monitor_add(struct netdev_monitor
*monitor
, struct netdev
*netdev
)
1500 const char *netdev_name
= netdev_get_name(netdev
);
1502 if (!shash_find(&monitor
->polled_netdevs
, netdev_name
)
1503 && netdev_get_dev(netdev
)->netdev_class
->poll_add
)
1505 struct netdev_notifier
*notifier
;
1506 error
= netdev_get_dev(netdev
)->netdev_class
->poll_add(netdev
,
1507 netdev_monitor_cb
, monitor
, ¬ifier
);
1509 assert(notifier
->netdev
== netdev
);
1510 shash_add(&monitor
->polled_netdevs
, netdev_name
, notifier
);
1516 /* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has
1517 * no effect if 'netdev' is not in the set of devices monitored by
1520 netdev_monitor_remove(struct netdev_monitor
*monitor
, struct netdev
*netdev
)
1522 const char *netdev_name
= netdev_get_name(netdev
);
1523 struct shash_node
*node
;
1525 node
= shash_find(&monitor
->polled_netdevs
, netdev_name
);
1527 /* Cancel future notifications. */
1528 struct netdev_notifier
*notifier
= node
->data
;
1529 netdev_get_dev(netdev
)->netdev_class
->poll_remove(notifier
);
1530 shash_delete(&monitor
->polled_netdevs
, node
);
1532 /* Drop any pending notification. */
1533 node
= shash_find(&monitor
->changed_netdevs
, netdev_name
);
1535 shash_delete(&monitor
->changed_netdevs
, node
);
1540 /* Checks for changes to netdevs in the set monitored by 'monitor'. If any of
1541 * the attributes (Ethernet address, carrier status, speed or peer-advertised
1542 * speed, flags, etc.) of a network device monitored by 'monitor' has changed,
1543 * sets '*devnamep' to the name of a device that has changed and returns 0.
1544 * The caller is responsible for freeing '*devnamep' (with free()).
1546 * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN.
1549 netdev_monitor_poll(struct netdev_monitor
*monitor
, char **devnamep
)
1551 struct shash_node
*node
= shash_first(&monitor
->changed_netdevs
);
1556 *devnamep
= xstrdup(node
->name
);
1557 shash_delete(&monitor
->changed_netdevs
, node
);
1562 /* Registers with the poll loop to wake up from the next call to poll_block()
1563 * when netdev_monitor_poll(monitor) would indicate that a device has
1566 netdev_monitor_poll_wait(const struct netdev_monitor
*monitor
)
1568 if (!shash_is_empty(&monitor
->changed_netdevs
)) {
1569 poll_immediate_wake();
1571 /* XXX Nothing needed here for netdev_linux, but maybe other netdev
1572 * classes need help. */
1576 /* Restore the network device flags on 'netdev' to those that were active
1577 * before we changed them. Returns 0 if successful, otherwise a positive
1580 * To avoid reentry, the caller must ensure that fatal signals are blocked. */
1582 restore_flags(struct netdev
*netdev
)
1584 if (netdev
->changed_flags
) {
1585 enum netdev_flags restore
= netdev
->save_flags
& netdev
->changed_flags
;
1586 enum netdev_flags old_flags
;
1587 return netdev_get_dev(netdev
)->netdev_class
->update_flags(netdev
,
1588 netdev
->changed_flags
& ~restore
,
1589 restore
, &old_flags
);
1594 /* Close all netdevs on shutdown so they can do any needed cleanup such as
1595 * destroying devices, restoring flags, etc. */
1597 close_all_netdevs(void *aux OVS_UNUSED
)
1599 struct netdev
*netdev
, *next
;
1600 LIST_FOR_EACH_SAFE(netdev
, next
, struct netdev
, node
, &netdev_list
) {
1601 netdev_close(netdev
);