2 * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2016 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef NETDEV_PROVIDER_H
18 #define NETDEV_PROVIDER_H 1
20 /* Generic interface to network devices. */
22 #include "connectivity.h"
24 #include "openvswitch/list.h"
28 #include "openvswitch/shash.h"
35 struct netdev_tnl_build_header_params
;
36 #define NETDEV_NUMA_UNSPEC OVS_NUMA_UNSPEC
38 /* A network device (e.g. an Ethernet device).
40 * Network device implementations may read these members but should not modify
43 /* The following do not change during the lifetime of a struct netdev. */
44 char *name
; /* Name of network device. */
45 const struct netdev_class
*netdev_class
; /* Functions to control
48 /* If this is 'true' the user did not specify a netdev_class when
49 * opening this device, and therefore got assigned to the "system" class */
52 /* If this is 'true', the user explicitly specified an MTU for this
53 * netdev. Otherwise, Open vSwitch is allowed to override it. */
56 int ref_cnt
; /* Times this devices was opened. */
58 /* A sequence number which indicates changes in one of 'netdev''s
59 * properties. It must be nonzero so that users have a value which
60 * they may use as a reset when tracking 'netdev'.
62 * Minimally, the sequence number is required to change whenever
63 * 'netdev''s flags, features, ethernet address, or carrier changes. */
66 /* A netdev provider might be unable to change some of the device's
67 * parameter (n_rxq, mtu) when the device is in use. In this case
68 * the provider can notify the upper layer by calling
69 * netdev_request_reconfigure(). The upper layer will react by stopping
70 * the operations on the device and calling netdev_reconfigure() to allow
71 * the configuration changes. 'last_reconfigure_seq' remembers the value
72 * of 'reconfigure_seq' when the last reconfiguration happened. */
73 struct seq
*reconfigure_seq
;
74 uint64_t last_reconfigure_seq
;
76 /* The core netdev code initializes these at netdev construction and only
77 * provide read-only access to its client. Netdev implementations may
81 struct shash_node
*node
; /* Pointer to element in global map. */
82 struct ovs_list saved_flags_list
; /* Contains "struct netdev_saved_flags". */
86 netdev_change_seq_changed(const struct netdev
*netdev_
)
88 struct netdev
*netdev
= CONST_CAST(struct netdev
*, netdev_
);
89 seq_change(connectivity_seq_get());
91 if (!netdev
->change_seq
) {
97 netdev_request_reconfigure(struct netdev
*netdev
)
99 seq_change(netdev
->reconfigure_seq
);
102 const char *netdev_get_type(const struct netdev
*);
103 const struct netdev_class
*netdev_get_class(const struct netdev
*);
104 const char *netdev_get_name(const struct netdev
*);
105 struct netdev
*netdev_from_name(const char *name
);
106 void netdev_get_devices(const struct netdev_class
*,
107 struct shash
*device_list
);
108 struct netdev
**netdev_get_vports(size_t *size
);
110 /* A data structure for capturing packets received by a network device.
112 * Network device implementations may read these members but should not modify
115 * None of these members change during the lifetime of a struct netdev_rxq. */
117 struct netdev
*netdev
; /* Owns a reference to the netdev. */
121 struct netdev
*netdev_rxq_get_netdev(const struct netdev_rxq
*);
124 struct netdev_flow_dump
{
125 struct netdev
*netdev
;
128 struct nl_dump
*nl_dump
;
131 /* Network device class structure, to be defined by each implementation of a
134 * These functions return 0 if successful or a positive errno value on failure,
135 * except where otherwise noted.
141 * These functions work primarily with two different kinds of data structures:
143 * - "struct netdev", which represents a network device.
145 * - "struct netdev_rxq", which represents a handle for capturing packets
146 * received on a network device
148 * Each of these data structures contains all of the implementation-independent
149 * generic state for the respective concept, called the "base" state. None of
150 * them contains any extra space for implementations to use. Instead, each
151 * implementation is expected to declare its own data structure that contains
152 * an instance of the generic data structure plus additional
153 * implementation-specific members, called the "derived" state. The
154 * implementation can use casts or (preferably) the CONTAINER_OF macro to
155 * obtain access to derived state given only a pointer to the embedded generic
162 * Four stylized functions accompany each of these data structures:
164 * "alloc" "construct" "destruct" "dealloc"
165 * ------------ ---------------- --------------- --------------
166 * netdev ->alloc ->construct ->destruct ->dealloc
167 * netdev_rxq ->rxq_alloc ->rxq_construct ->rxq_destruct ->rxq_dealloc
169 * Any instance of a given data structure goes through the following life
172 * 1. The client calls the "alloc" function to obtain raw memory. If "alloc"
173 * fails, skip all the other steps.
175 * 2. The client initializes all of the data structure's base state. If this
176 * fails, skip to step 7.
178 * 3. The client calls the "construct" function. The implementation
179 * initializes derived state. It may refer to the already-initialized
180 * base state. If "construct" fails, skip to step 6.
182 * 4. The data structure is now initialized and in use.
184 * 5. When the data structure is no longer needed, the client calls the
185 * "destruct" function. The implementation uninitializes derived state.
186 * The base state has not been uninitialized yet, so the implementation
187 * may still refer to it.
189 * 6. The client uninitializes all of the data structure's base state.
191 * 7. The client calls the "dealloc" to free the raw memory. The
192 * implementation must not refer to base or derived state in the data
193 * structure, because it has already been uninitialized.
195 * If netdev support multi-queue IO then netdev->construct should set initialize
196 * netdev->n_rxq to number of queues.
198 * Each "alloc" function allocates and returns a new instance of the respective
199 * data structure. The "alloc" function is not given any information about the
200 * use of the new data structure, so it cannot perform much initialization.
201 * Its purpose is just to ensure that the new data structure has enough room
202 * for base and derived state. It may return a null pointer if memory is not
203 * available, in which case none of the other functions is called.
205 * Each "construct" function initializes derived state in its respective data
206 * structure. When "construct" is called, all of the base state has already
207 * been initialized, so the "construct" function may refer to it. The
208 * "construct" function is allowed to fail, in which case the client calls the
209 * "dealloc" function (but not the "destruct" function).
211 * Each "destruct" function uninitializes and frees derived state in its
212 * respective data structure. When "destruct" is called, the base state has
213 * not yet been uninitialized, so the "destruct" function may refer to it. The
214 * "destruct" function is not allowed to fail.
216 * Each "dealloc" function frees raw memory that was allocated by the
217 * "alloc" function. The memory's base and derived members might not have ever
218 * been initialized (but if "construct" returned successfully, then it has been
219 * "destruct"ed already). The "dealloc" function is not allowed to fail.
222 * Device Change Notification
223 * ==========================
225 * Minimally, implementations are required to report changes to netdev flags,
226 * features, ethernet address or carrier through connectivity_seq. Changes to
227 * other properties are allowed to cause notification through this interface,
228 * although implementations should try to avoid this. connectivity_seq_get()
229 * can be used to acquire a reference to the struct seq. The interface is
230 * described in detail in seq.h. */
231 struct netdev_class
{
232 /* Type of netdevs in this class, e.g. "system", "tap", "gre", etc.
234 * One of the providers should supply a "system" type, since this is
235 * the type assumed if no type is specified when opening a netdev.
236 * The "system" type corresponds to an existing network device on
240 /* If 'true' then this netdev should be polled by PMD threads. */
243 /* ## ------------------- ## */
244 /* ## Top-Level Functions ## */
245 /* ## ------------------- ## */
247 /* Called when the netdev provider is registered, typically at program
248 * startup. Returning an error from this function will prevent any network
249 * device in this class from being opened.
251 * This function may be set to null if a network device class needs no
252 * initialization at registration time. */
255 /* Performs periodic work needed by netdevs of this class. May be null if
256 * no periodic work is necessary.
258 * 'netdev_class' points to the class. It is useful in case the same
259 * function is used to implement different classes. */
260 void (*run
)(const struct netdev_class
*netdev_class
);
262 /* Arranges for poll_block() to wake up if the "run" member function needs
263 * to be called. Implementations are additionally required to wake
264 * whenever something changes in any of its netdevs which would cause their
265 * ->change_seq() function to change its result. May be null if nothing is
268 * 'netdev_class' points to the class. It is useful in case the same
269 * function is used to implement different classes. */
270 void (*wait
)(const struct netdev_class
*netdev_class
);
272 /* ## ---------------- ## */
273 /* ## netdev Functions ## */
274 /* ## ---------------- ## */
276 /* Life-cycle functions for a netdev. See the large comment above on
277 * struct netdev_class. */
278 struct netdev
*(*alloc
)(void);
279 int (*construct
)(struct netdev
*);
280 void (*destruct
)(struct netdev
*);
281 void (*dealloc
)(struct netdev
*);
283 /* Fetches the device 'netdev''s configuration, storing it in 'args'.
284 * The caller owns 'args' and pre-initializes it to an empty smap.
286 * If this netdev class does not have any configuration options, this may
287 * be a null pointer. */
288 int (*get_config
)(const struct netdev
*netdev
, struct smap
*args
);
290 /* Changes the device 'netdev''s configuration to 'args'.
292 * If this netdev class does not support configuration, this may be a null
295 * If the return value is not zero (meaning that an error occurred),
296 * the provider can allocate a string with an error message in '*errp'.
297 * The caller has to call free on it. */
298 int (*set_config
)(struct netdev
*netdev
, const struct smap
*args
,
301 /* Returns the tunnel configuration of 'netdev'. If 'netdev' is
302 * not a tunnel, returns null.
304 * If this function would always return null, it may be null instead. */
305 const struct netdev_tunnel_config
*
306 (*get_tunnel_config
)(const struct netdev
*netdev
);
308 /* Build Tunnel header. Ethernet and ip header parameters are passed to
309 * tunnel implementation to build entire outer header for given flow. */
310 int (*build_header
)(const struct netdev
*, struct ovs_action_push_tnl
*data
,
311 const struct netdev_tnl_build_header_params
*params
);
313 /* build_header() can not build entire header for all packets for given
314 * flow. Push header is called for packet to build header specific to
315 * a packet on actual transmit. It uses partial header build by
316 * build_header() which is passed as data. */
317 void (*push_header
)(struct dp_packet
*packet
,
318 const struct ovs_action_push_tnl
*data
);
320 /* Pop tunnel header from packet, build tunnel metadata and resize packet
321 * for further processing.
322 * Returns NULL in case of error or tunnel implementation queued packet for further
324 struct dp_packet
* (*pop_header
)(struct dp_packet
*packet
);
326 /* Returns the id of the numa node the 'netdev' is on. If there is no
327 * such info, returns NETDEV_NUMA_UNSPEC. */
328 int (*get_numa_id
)(const struct netdev
*netdev
);
330 /* Configures the number of tx queues of 'netdev'. Returns 0 if successful,
331 * otherwise a positive errno value.
333 * 'n_txq' specifies the exact number of transmission queues to create.
335 * The caller will call netdev_reconfigure() (if necessary) before using
336 * netdev_send() on any of the newly configured queues, giving the provider
337 * a chance to adjust its settings.
339 * On error, the tx queue configuration is unchanged. */
340 int (*set_tx_multiq
)(struct netdev
*netdev
, unsigned int n_txq
);
342 /* Sends buffers on 'netdev'.
343 * Returns 0 if successful (for every buffer), otherwise a positive errno
344 * value. Returns EAGAIN without blocking if one or more packets cannot be
345 * queued immediately. Returns EMSGSIZE if a partial packet was transmitted
346 * or if a packet is too big or too small to transmit on the device.
348 * If the function returns a non-zero value, some of the packets might have
351 * If 'may_steal' is false, the caller retains ownership of all the
352 * packets. If 'may_steal' is true, the caller transfers ownership of all
353 * the packets to the network device, regardless of success.
355 * If 'concurrent_txq' is true, the caller may perform concurrent calls
356 * to netdev_send() with the same 'qid'. The netdev provider is responsible
357 * for making sure that these concurrent calls do not create a race
358 * condition by using locking or other synchronization if required.
360 * The network device is expected to maintain one or more packet
361 * transmission queues, so that the caller does not ordinarily have to
362 * do additional queuing of packets. 'qid' specifies the queue to use
363 * and can be ignored if the implementation does not support multiple
366 * May return EOPNOTSUPP if a network device does not implement packet
367 * transmission through this interface. This function may be set to null
368 * if it would always return EOPNOTSUPP anyhow. (This will prevent the
369 * network device from being usefully used by the netdev-based "userspace
370 * datapath". It will also prevent the OVS implementation of bonding from
371 * working properly over 'netdev'.) */
372 int (*send
)(struct netdev
*netdev
, int qid
, struct dp_packet_batch
*batch
,
373 bool may_steal
, bool concurrent_txq
);
375 /* Registers with the poll loop to wake up from the next call to
376 * poll_block() when the packet transmission queue for 'netdev' has
377 * sufficient room to transmit a packet with netdev_send().
379 * The network device is expected to maintain one or more packet
380 * transmission queues, so that the caller does not ordinarily have to
381 * do additional queuing of packets. 'qid' specifies the queue to use
382 * and can be ignored if the implementation does not support multiple
385 * May be null if not needed, such as for a network device that does not
386 * implement packet transmission through the 'send' member function. */
387 void (*send_wait
)(struct netdev
*netdev
, int qid
);
389 /* Sets 'netdev''s Ethernet address to 'mac' */
390 int (*set_etheraddr
)(struct netdev
*netdev
, const struct eth_addr mac
);
392 /* Retrieves 'netdev''s Ethernet address into 'mac'.
394 * This address will be advertised as 'netdev''s MAC address through the
395 * OpenFlow protocol, among other uses. */
396 int (*get_etheraddr
)(const struct netdev
*netdev
, struct eth_addr
*mac
);
398 /* Retrieves 'netdev''s MTU into '*mtup'.
400 * The MTU is the maximum size of transmitted (and received) packets, in
401 * bytes, not including the hardware header; thus, this is typically 1500
402 * bytes for Ethernet devices.
404 * If 'netdev' does not have an MTU (e.g. as some tunnels do not), then
405 * this function should return EOPNOTSUPP. This function may be set to
406 * null if it would always return EOPNOTSUPP. */
407 int (*get_mtu
)(const struct netdev
*netdev
, int *mtup
);
409 /* Sets 'netdev''s MTU to 'mtu'.
411 * If 'netdev' does not have an MTU (e.g. as some tunnels do not), then
412 * this function should return EOPNOTSUPP. This function may be set to
413 * null if it would always return EOPNOTSUPP. */
414 int (*set_mtu
)(struct netdev
*netdev
, int mtu
);
416 /* Returns the ifindex of 'netdev', if successful, as a positive number.
417 * On failure, returns a negative errno value.
419 * The desired semantics of the ifindex value are a combination of those
420 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An
421 * ifindex value should be unique within a host and remain stable at least
422 * until reboot. SNMP says an ifindex "ranges between 1 and the value of
423 * ifNumber" but many systems do not follow this rule anyhow.
425 * This function may be set to null if it would always return -EOPNOTSUPP.
427 int (*get_ifindex
)(const struct netdev
*netdev
);
429 /* Sets 'carrier' to true if carrier is active (link light is on) on
432 * May be null if device does not provide carrier status (will be always
433 * up as long as device is up).
435 int (*get_carrier
)(const struct netdev
*netdev
, bool *carrier
);
437 /* Returns the number of times 'netdev''s carrier has changed since being
440 * If null, callers will assume the number of carrier resets is zero. */
441 long long int (*get_carrier_resets
)(const struct netdev
*netdev
);
443 /* Forces ->get_carrier() to poll 'netdev''s MII registers for link status
444 * instead of checking 'netdev''s carrier. 'netdev''s MII registers will
445 * be polled once every 'interval' milliseconds. If 'netdev' does not
446 * support MII, another method may be used as a fallback. If 'interval' is
447 * less than or equal to zero, reverts ->get_carrier() to its normal
450 * Most network devices won't support this feature and will set this
451 * function pointer to NULL, which is equivalent to returning EOPNOTSUPP.
453 int (*set_miimon_interval
)(struct netdev
*netdev
, long long int interval
);
455 /* Retrieves current device stats for 'netdev' into 'stats'.
457 * A network device that supports some statistics but not others, it should
458 * set the values of the unsupported statistics to all-1-bits
460 int (*get_stats
)(const struct netdev
*netdev
, struct netdev_stats
*);
462 /* Stores the features supported by 'netdev' into each of '*current',
463 * '*advertised', '*supported', and '*peer'. Each value is a bitmap of
466 * This function may be set to null if it would always return EOPNOTSUPP.
468 int (*get_features
)(const struct netdev
*netdev
,
469 enum netdev_features
*current
,
470 enum netdev_features
*advertised
,
471 enum netdev_features
*supported
,
472 enum netdev_features
*peer
);
474 /* Set the features advertised by 'netdev' to 'advertise', which is a
475 * set of NETDEV_F_* bits.
477 * This function may be set to null for a network device that does not
478 * support configuring advertisements. */
479 int (*set_advertisements
)(struct netdev
*netdev
,
480 enum netdev_features advertise
);
482 /* Returns 'netdev''s configured packet_type mode.
484 * This function may be set to null if it would always return
485 * NETDEV_PT_LEGACY_L2. */
486 enum netdev_pt_mode (*get_pt_mode
)(const struct netdev
*netdev
);
488 /* Attempts to set input rate limiting (policing) policy, such that up to
489 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative
490 * burst size of 'kbits' kb.
492 * This function may be set to null if policing is not supported. */
493 int (*set_policing
)(struct netdev
*netdev
, unsigned int kbits_rate
,
494 unsigned int kbits_burst
);
496 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves
497 * it empty if 'netdev' does not support QoS. Any names added to 'types'
498 * should be documented as valid for the "type" column in the "QoS" table
499 * in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
501 * Every network device must support disabling QoS with a type of "", but
502 * this function must not add "" to 'types'.
504 * The caller is responsible for initializing 'types' (e.g. with
505 * sset_init()) before calling this function. The caller retains ownership
508 * May be NULL if 'netdev' does not support QoS at all. */
509 int (*get_qos_types
)(const struct netdev
*netdev
, struct sset
*types
);
511 /* Queries 'netdev' for its capabilities regarding the specified 'type' of
512 * QoS. On success, initializes 'caps' with the QoS capabilities.
514 * Should return EOPNOTSUPP if 'netdev' does not support 'type'. May be
515 * NULL if 'netdev' does not support QoS at all. */
516 int (*get_qos_capabilities
)(const struct netdev
*netdev
,
518 struct netdev_qos_capabilities
*caps
);
520 /* Queries 'netdev' about its currently configured form of QoS. If
521 * successful, stores the name of the current form of QoS into '*typep'
522 * and any details of configuration as string key-value pairs in
525 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
527 * The caller initializes 'details' before calling this function. The
528 * caller takes ownership of the string key-values pairs added to
531 * The netdev retains ownership of '*typep'.
533 * '*typep' will be one of the types returned by netdev_get_qos_types() for
534 * 'netdev'. The contents of 'details' should be documented as valid for
535 * '*typep' in the "other_config" column in the "QoS" table in
536 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
538 * May be NULL if 'netdev' does not support QoS at all. */
539 int (*get_qos
)(const struct netdev
*netdev
,
540 const char **typep
, struct smap
*details
);
542 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to
543 * 'type' with details of configuration from 'details'.
545 * On error, the previous QoS configuration is retained.
547 * When this function changes the type of QoS (not just 'details'), this
548 * also resets all queue configuration for 'netdev' to their defaults
549 * (which depend on the specific type of QoS). Otherwise, the queue
550 * configuration for 'netdev' is unchanged.
552 * 'type' should be "" (to disable QoS) or one of the types returned by
553 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should
554 * be documented as valid for the given 'type' in the "other_config" column
555 * in the "QoS" table in vswitchd/vswitch.xml (which is built as
556 * ovs-vswitchd.conf.db(8)).
558 * May be NULL if 'netdev' does not support QoS at all. */
559 int (*set_qos
)(struct netdev
*netdev
,
560 const char *type
, const struct smap
*details
);
562 /* Queries 'netdev' for information about the queue numbered 'queue_id'.
563 * If successful, adds that information as string key-value pairs to
564 * 'details'. Returns 0 if successful, otherwise a positive errno value.
566 * Should return EINVAL if 'queue_id' is greater than or equal to the
567 * number of supported queues (as reported in the 'n_queues' member of
568 * struct netdev_qos_capabilities by 'get_qos_capabilities').
570 * The caller initializes 'details' before calling this function. The
571 * caller takes ownership of the string key-values pairs added to
574 * The returned contents of 'details' should be documented as valid for the
575 * given 'type' in the "other_config" column in the "Queue" table in
576 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
578 int (*get_queue
)(const struct netdev
*netdev
,
579 unsigned int queue_id
, struct smap
*details
);
581 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
582 * string pairs in 'details'. The contents of 'details' should be
583 * documented as valid for the given 'type' in the "other_config" column in
584 * the "Queue" table in vswitchd/vswitch.xml (which is built as
585 * ovs-vswitchd.conf.db(8)). Returns 0 if successful, otherwise a positive
586 * errno value. On failure, the given queue's configuration should be
589 * Should return EINVAL if 'queue_id' is greater than or equal to the
590 * number of supported queues (as reported in the 'n_queues' member of
591 * struct netdev_qos_capabilities by 'get_qos_capabilities'), or if
592 * 'details' is invalid for the type of queue.
594 * This function does not modify 'details', and the caller retains
597 * May be NULL if 'netdev' does not support QoS at all. */
598 int (*set_queue
)(struct netdev
*netdev
,
599 unsigned int queue_id
, const struct smap
*details
);
601 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'.
603 * Should return EINVAL if 'queue_id' is greater than or equal to the
604 * number of supported queues (as reported in the 'n_queues' member of
605 * struct netdev_qos_capabilities by 'get_qos_capabilities'). Should
606 * return EOPNOTSUPP if 'queue_id' is valid but may not be deleted (e.g. if
607 * 'netdev' has a fixed set of queues with the current QoS mode).
609 * May be NULL if 'netdev' does not support QoS at all, or if all of its
610 * QoS modes have fixed sets of queues. */
611 int (*delete_queue
)(struct netdev
*netdev
, unsigned int queue_id
);
613 /* Obtains statistics about 'queue_id' on 'netdev'. Fills 'stats' with the
614 * queue's statistics. May set individual members of 'stats' to all-1-bits
615 * if the statistic is unavailable.
617 * May be NULL if 'netdev' does not support QoS at all. */
618 int (*get_queue_stats
)(const struct netdev
*netdev
, unsigned int queue_id
,
619 struct netdev_queue_stats
*stats
);
621 /* Attempts to begin dumping the queues in 'netdev'. On success, returns 0
622 * and initializes '*statep' with any data needed for iteration. On
623 * failure, returns a positive errno value.
625 * May be NULL if 'netdev' does not support QoS at all. */
626 int (*queue_dump_start
)(const struct netdev
*netdev
, void **statep
);
628 /* Attempts to retrieve another queue from 'netdev' for 'state', which was
629 * initialized by a successful call to the 'queue_dump_start' function for
630 * 'netdev'. On success, stores a queue ID into '*queue_id' and fills
631 * 'details' with the configuration of the queue with that ID. Returns EOF
632 * if the last queue has been dumped, or a positive errno value on error.
633 * This function will not be called again once it returns nonzero once for
634 * a given iteration (but the 'queue_dump_done' function will be called
637 * The caller initializes and clears 'details' before calling this
638 * function. The caller takes ownership of the string key-values pairs
639 * added to 'details'.
641 * The returned contents of 'details' should be documented as valid for the
642 * given 'type' in the "other_config" column in the "Queue" table in
643 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
645 * May be NULL if 'netdev' does not support QoS at all. */
646 int (*queue_dump_next
)(const struct netdev
*netdev
, void *state
,
647 unsigned int *queue_id
, struct smap
*details
);
649 /* Releases resources from 'netdev' for 'state', which was initialized by a
650 * successful call to the 'queue_dump_start' function for 'netdev'.
652 * May be NULL if 'netdev' does not support QoS at all. */
653 int (*queue_dump_done
)(const struct netdev
*netdev
, void *state
);
655 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's
656 * ID, its statistics, and the 'aux' specified by the caller. The order of
657 * iteration is unspecified, but (when successful) each queue must be
658 * visited exactly once.
660 * 'cb' will not modify or free the statistics passed in. */
661 int (*dump_queue_stats
)(const struct netdev
*netdev
,
662 void (*cb
)(unsigned int queue_id
,
663 struct netdev_queue_stats
*,
667 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
668 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared.
670 * This function may be set to null if it would always return EOPNOTSUPP
672 int (*set_in4
)(struct netdev
*netdev
, struct in_addr addr
,
673 struct in_addr mask
);
675 /* Returns all assigned IP address to 'netdev' and returns 0.
676 * API allocates array of address and masks and set it to
677 * '*addr' and '*mask'.
678 * Otherwise, returns a positive errno value and sets '*addr', '*mask
679 * and '*n_addr' to NULL.
681 * The following error values have well-defined meanings:
683 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
685 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
687 * 'addr' may be null, in which case the address itself is not reported. */
688 int (*get_addr_list
)(const struct netdev
*netdev
, struct in6_addr
**in
,
689 struct in6_addr
**mask
, int *n_in6
);
691 /* Adds 'router' as a default IP gateway for the TCP/IP stack that
692 * corresponds to 'netdev'.
694 * This function may be set to null if it would always return EOPNOTSUPP
696 int (*add_router
)(struct netdev
*netdev
, struct in_addr router
);
698 /* Looks up the next hop for 'host' in the host's routing table. If
699 * successful, stores the next hop gateway's address (0 if 'host' is on a
700 * directly connected network) in '*next_hop' and a copy of the name of the
701 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
702 * responsible for freeing '*netdev_name' (by calling free()).
704 * This function may be set to null if it would always return EOPNOTSUPP
706 int (*get_next_hop
)(const struct in_addr
*host
, struct in_addr
*next_hop
,
709 /* Retrieves driver information of the device.
711 * Populates 'smap' with key-value pairs representing the status of the
712 * device. 'smap' is a set of key-value string pairs representing netdev
713 * type specific information. For more information see
714 * ovs-vswitchd.conf.db(5).
716 * The caller is responsible for destroying 'smap' and its data.
718 * This function may be set to null if it would always return EOPNOTSUPP
720 int (*get_status
)(const struct netdev
*netdev
, struct smap
*smap
);
722 /* Looks up the ARP table entry for 'ip' on 'netdev' and stores the
723 * corresponding MAC address in 'mac'. A return value of ENXIO, in
724 * particular, indicates that there is no ARP table entry for 'ip' on
727 * This function may be set to null if it would always return EOPNOTSUPP
729 int (*arp_lookup
)(const struct netdev
*netdev
, ovs_be32 ip
,
730 struct eth_addr
*mac
);
732 /* Retrieves the current set of flags on 'netdev' into '*old_flags'. Then,
733 * turns off the flags that are set to 1 in 'off' and turns on the flags
734 * that are set to 1 in 'on'. (No bit will be set to 1 in both 'off' and
735 * 'on'; that is, off & on == 0.)
737 * This function may be invoked from a signal handler. Therefore, it
738 * should not do anything that is not signal-safe (such as logging). */
739 int (*update_flags
)(struct netdev
*netdev
, enum netdev_flags off
,
740 enum netdev_flags on
, enum netdev_flags
*old_flags
);
742 /* If the provider called netdev_request_reconfigure(), the upper layer
743 * will eventually call this. The provider can update the device
744 * configuration knowing that the upper layer will not call rxq_recv() or
745 * send() until this function returns.
747 * On error, the configuration is indeterminant and the device cannot be
748 * used to send and receive packets until a successful configuration is
750 int (*reconfigure
)(struct netdev
*netdev
);
751 /* ## -------------------- ## */
752 /* ## netdev_rxq Functions ## */
753 /* ## -------------------- ## */
755 /* If a particular netdev class does not support receiving packets, all these
756 * function pointers must be NULL. */
758 /* Life-cycle functions for a netdev_rxq. See the large comment above on
759 * struct netdev_class. */
760 struct netdev_rxq
*(*rxq_alloc
)(void);
761 int (*rxq_construct
)(struct netdev_rxq
*);
762 void (*rxq_destruct
)(struct netdev_rxq
*);
763 void (*rxq_dealloc
)(struct netdev_rxq
*);
765 /* Attempts to receive a batch of packets from 'rx'. In 'batch', the
766 * caller supplies 'packets' as the pointer to the beginning of an array
767 * of NETDEV_MAX_BURST pointers to dp_packet. If successful, the
768 * implementation stores pointers to up to NETDEV_MAX_BURST dp_packets into
769 * the array, transferring ownership of the packets to the caller, stores
770 * the number of received packets into 'count', and returns 0.
772 * The implementation does not necessarily initialize any non-data members
773 * of 'packets' in 'batch'. That is, the caller must initialize layer
774 * pointers and metadata itself, if desired, e.g. with pkt_metadata_init()
775 * and miniflow_extract().
777 * Implementations should allocate buffers with DP_NETDEV_HEADROOM bytes of
780 * Returns EAGAIN immediately if no packet is ready to be received or
781 * another positive errno value if an error was encountered. */
782 int (*rxq_recv
)(struct netdev_rxq
*rx
, struct dp_packet_batch
*batch
);
784 /* Registers with the poll loop to wake up from the next call to
785 * poll_block() when a packet is ready to be received with
786 * netdev_rxq_recv() on 'rx'. */
787 void (*rxq_wait
)(struct netdev_rxq
*rx
);
789 /* Discards all packets waiting to be received from 'rx'. */
790 int (*rxq_drain
)(struct netdev_rxq
*rx
);
792 /* ## -------------------------------- ## */
793 /* ## netdev flow offloading functions ## */
794 /* ## -------------------------------- ## */
796 /* If a particular netdev class does not support offloading flows,
797 * all these function pointers must be NULL. */
799 /* Flush all offloaded flows from a netdev.
800 * Return 0 if successful, otherwise returns a positive errno value. */
801 int (*flow_flush
)(struct netdev
*);
803 /* Flow dumping interface.
805 * This is the back-end for the flow dumping interface described in
806 * dpif.h. Please read the comments there first, because this code
807 * closely follows it.
809 * On success returns 0 and allocates data, on failure returns
811 int (*flow_dump_create
)(struct netdev
*, struct netdev_flow_dump
**dump
);
812 int (*flow_dump_destroy
)(struct netdev_flow_dump
*);
814 /* Returns true if there are more flows to dump.
815 * 'rbuffer' is used as a temporary buffer and needs to be pre allocated
816 * by the caller. While there are more flows the same 'rbuffer'
817 * should be provided. 'wbuffer' is used to store dumped actions and needs
818 * to be pre allocated by the caller. */
819 bool (*flow_dump_next
)(struct netdev_flow_dump
*, struct match
*,
820 struct nlattr
**actions
,
821 struct dpif_flow_stats
*stats
, ovs_u128
*ufid
,
822 struct ofpbuf
*rbuffer
, struct ofpbuf
*wbuffer
);
824 /* Offload the given flow on netdev.
825 * To modify a flow, use the same ufid.
826 * 'actions' are in netlink format, as with struct dpif_flow_put.
827 * 'info' is extra info needed to offload the flow.
828 * 'stats' is populated according to the rules set out in the description
829 * above 'struct dpif_flow_put'.
830 * Return 0 if successful, otherwise returns a positive errno value. */
831 int (*flow_put
)(struct netdev
*, struct match
*, struct nlattr
*actions
,
832 size_t actions_len
, const ovs_u128
*ufid
,
833 struct offload_info
*info
, struct dpif_flow_stats
*);
835 /* Queries a flow specified by ufid on netdev.
836 * Fills output buffer as 'wbuffer' in flow_dump_next, which
837 * needs to be be pre allocated.
838 * Return 0 if successful, otherwise returns a positive errno value. */
839 int (*flow_get
)(struct netdev
*, struct match
*, struct nlattr
**actions
,
840 const ovs_u128
*ufid
, struct dpif_flow_stats
*,
841 struct ofpbuf
*wbuffer
);
843 /* Delete a flow specified by ufid from netdev.
844 * 'stats' is populated according to the rules set out in the description
845 * above 'struct dpif_flow_del'.
846 * Return 0 if successful, otherwise returns a positive errno value. */
847 int (*flow_del
)(struct netdev
*, const ovs_u128
*ufid
,
848 struct dpif_flow_stats
*);
850 /* Initializies the netdev flow api.
851 * Return 0 if successful, otherwise returns a positive errno value. */
852 int (*init_flow_api
)(struct netdev
*);
855 int netdev_register_provider(const struct netdev_class
*);
856 int netdev_unregister_provider(const char *type
);
858 #if defined(__FreeBSD__) || defined(__NetBSD__)
859 extern const struct netdev_class netdev_bsd_class
;
860 #elif defined(_WIN32)
861 extern const struct netdev_class netdev_windows_class
;
863 extern const struct netdev_class netdev_linux_class
;
865 extern const struct netdev_class netdev_internal_class
;
866 extern const struct netdev_class netdev_tap_class
;
872 #define NO_OFFLOAD_API NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
874 #endif /* netdev.h */