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 /* A sequence number which indicates changes in one of 'netdev''s
53 * properties. It must be nonzero so that users have a value which
54 * they may use as a reset when tracking 'netdev'.
56 * Minimally, the sequence number is required to change whenever
57 * 'netdev''s flags, features, ethernet address, or carrier changes. */
60 /* A netdev provider might be unable to change some of the device's
61 * parameter (n_rxq, mtu) when the device is in use. In this case
62 * the provider can notify the upper layer by calling
63 * netdev_request_reconfigure(). The upper layer will react by stopping
64 * the operations on the device and calling netdev_reconfigure() to allow
65 * the configuration changes. 'last_reconfigure_seq' remembers the value
66 * of 'reconfigure_seq' when the last reconfiguration happened. */
67 struct seq
*reconfigure_seq
;
68 uint64_t last_reconfigure_seq
;
70 /* If this is 'true', the user explicitly specified an MTU for this
71 * netdev. Otherwise, Open vSwitch is allowed to override it. */
74 /* The core netdev code initializes these at netdev construction and only
75 * provide read-only access to its client. Netdev implementations may
79 int ref_cnt
; /* Times this devices was opened. */
80 struct shash_node
*node
; /* Pointer to element in global map. */
81 struct ovs_list saved_flags_list
; /* Contains "struct netdev_saved_flags". */
85 netdev_change_seq_changed(const struct netdev
*netdev_
)
87 struct netdev
*netdev
= CONST_CAST(struct netdev
*, netdev_
);
88 seq_change(connectivity_seq_get());
90 if (!netdev
->change_seq
) {
96 netdev_request_reconfigure(struct netdev
*netdev
)
98 seq_change(netdev
->reconfigure_seq
);
101 const char *netdev_get_type(const struct netdev
*);
102 const struct netdev_class
*netdev_get_class(const struct netdev
*);
103 const char *netdev_get_name(const struct netdev
*);
104 struct netdev
*netdev_from_name(const char *name
);
105 void netdev_get_devices(const struct netdev_class
*,
106 struct shash
*device_list
);
107 struct netdev
**netdev_get_vports(size_t *size
);
109 /* A data structure for capturing packets received by a network device.
111 * Network device implementations may read these members but should not modify
114 * None of these members change during the lifetime of a struct netdev_rxq. */
116 struct netdev
*netdev
; /* Owns a reference to the netdev. */
120 struct netdev
*netdev_rxq_get_netdev(const struct netdev_rxq
*);
123 struct netdev_flow_dump
{
124 struct netdev
*netdev
;
126 struct nl_dump
*nl_dump
;
130 /* Network device class structure, to be defined by each implementation of a
133 * These functions return 0 if successful or a positive errno value on failure,
134 * except where otherwise noted.
140 * These functions work primarily with two different kinds of data structures:
142 * - "struct netdev", which represents a network device.
144 * - "struct netdev_rxq", which represents a handle for capturing packets
145 * received on a network device
147 * Each of these data structures contains all of the implementation-independent
148 * generic state for the respective concept, called the "base" state. None of
149 * them contains any extra space for implementations to use. Instead, each
150 * implementation is expected to declare its own data structure that contains
151 * an instance of the generic data structure plus additional
152 * implementation-specific members, called the "derived" state. The
153 * implementation can use casts or (preferably) the CONTAINER_OF macro to
154 * obtain access to derived state given only a pointer to the embedded generic
161 * Four stylized functions accompany each of these data structures:
163 * "alloc" "construct" "destruct" "dealloc"
164 * ------------ ---------------- --------------- --------------
165 * netdev ->alloc ->construct ->destruct ->dealloc
166 * netdev_rxq ->rxq_alloc ->rxq_construct ->rxq_destruct ->rxq_dealloc
168 * Any instance of a given data structure goes through the following life
171 * 1. The client calls the "alloc" function to obtain raw memory. If "alloc"
172 * fails, skip all the other steps.
174 * 2. The client initializes all of the data structure's base state. If this
175 * fails, skip to step 7.
177 * 3. The client calls the "construct" function. The implementation
178 * initializes derived state. It may refer to the already-initialized
179 * base state. If "construct" fails, skip to step 6.
181 * 4. The data structure is now initialized and in use.
183 * 5. When the data structure is no longer needed, the client calls the
184 * "destruct" function. The implementation uninitializes derived state.
185 * The base state has not been uninitialized yet, so the implementation
186 * may still refer to it.
188 * 6. The client uninitializes all of the data structure's base state.
190 * 7. The client calls the "dealloc" to free the raw memory. The
191 * implementation must not refer to base or derived state in the data
192 * structure, because it has already been uninitialized.
194 * If netdev support multi-queue IO then netdev->construct should set initialize
195 * netdev->n_rxq to number of queues.
197 * Each "alloc" function allocates and returns a new instance of the respective
198 * data structure. The "alloc" function is not given any information about the
199 * use of the new data structure, so it cannot perform much initialization.
200 * Its purpose is just to ensure that the new data structure has enough room
201 * for base and derived state. It may return a null pointer if memory is not
202 * available, in which case none of the other functions is called.
204 * Each "construct" function initializes derived state in its respective data
205 * structure. When "construct" is called, all of the base state has already
206 * been initialized, so the "construct" function may refer to it. The
207 * "construct" function is allowed to fail, in which case the client calls the
208 * "dealloc" function (but not the "destruct" function).
210 * Each "destruct" function uninitializes and frees derived state in its
211 * respective data structure. When "destruct" is called, the base state has
212 * not yet been uninitialized, so the "destruct" function may refer to it. The
213 * "destruct" function is not allowed to fail.
215 * Each "dealloc" function frees raw memory that was allocated by the
216 * "alloc" function. The memory's base and derived members might not have ever
217 * been initialized (but if "construct" returned successfully, then it has been
218 * "destruct"ed already). The "dealloc" function is not allowed to fail.
221 * Device Change Notification
222 * ==========================
224 * Minimally, implementations are required to report changes to netdev flags,
225 * features, ethernet address or carrier through connectivity_seq. Changes to
226 * other properties are allowed to cause notification through this interface,
227 * although implementations should try to avoid this. connectivity_seq_get()
228 * can be used to acquire a reference to the struct seq. The interface is
229 * described in detail in seq.h. */
230 struct netdev_class
{
231 /* Type of netdevs in this class, e.g. "system", "tap", "gre", etc.
233 * One of the providers should supply a "system" type, since this is
234 * the type assumed if no type is specified when opening a netdev.
235 * The "system" type corresponds to an existing network device on
239 /* If 'true' then this netdev should be polled by PMD threads. */
242 /* ## ------------------- ## */
243 /* ## Top-Level Functions ## */
244 /* ## ------------------- ## */
246 /* Called when the netdev provider is registered, typically at program
247 * startup. Returning an error from this function will prevent any network
248 * device in this class from being opened.
250 * This function may be set to null if a network device class needs no
251 * initialization at registration time. */
254 /* Performs periodic work needed by netdevs of this class. May be null if
255 * no periodic work is necessary.
257 * 'netdev_class' points to the class. It is useful in case the same
258 * function is used to implement different classes. */
259 void (*run
)(const struct netdev_class
*netdev_class
);
261 /* Arranges for poll_block() to wake up if the "run" member function needs
262 * to be called. Implementations are additionally required to wake
263 * whenever something changes in any of its netdevs which would cause their
264 * ->change_seq() function to change its result. May be null if nothing is
267 * 'netdev_class' points to the class. It is useful in case the same
268 * function is used to implement different classes. */
269 void (*wait
)(const struct netdev_class
*netdev_class
);
271 /* ## ---------------- ## */
272 /* ## netdev Functions ## */
273 /* ## ---------------- ## */
275 /* Life-cycle functions for a netdev. See the large comment above on
276 * struct netdev_class. */
277 struct netdev
*(*alloc
)(void);
278 int (*construct
)(struct netdev
*);
279 void (*destruct
)(struct netdev
*);
280 void (*dealloc
)(struct netdev
*);
282 /* Fetches the device 'netdev''s configuration, storing it in 'args'.
283 * The caller owns 'args' and pre-initializes it to an empty smap.
285 * If this netdev class does not have any configuration options, this may
286 * be a null pointer. */
287 int (*get_config
)(const struct netdev
*netdev
, struct smap
*args
);
289 /* Changes the device 'netdev''s configuration to 'args'.
291 * If this netdev class does not support configuration, this may be a null
294 * If the return value is not zero (meaning that an error occurred),
295 * the provider can allocate a string with an error message in '*errp'.
296 * The caller has to call free on it. */
297 int (*set_config
)(struct netdev
*netdev
, const struct smap
*args
,
300 /* Returns the tunnel configuration of 'netdev'. If 'netdev' is
301 * not a tunnel, returns null.
303 * If this function would always return null, it may be null instead. */
304 const struct netdev_tunnel_config
*
305 (*get_tunnel_config
)(const struct netdev
*netdev
);
307 /* Build Tunnel header. Ethernet and ip header parameters are passed to
308 * tunnel implementation to build entire outer header for given flow. */
309 int (*build_header
)(const struct netdev
*, struct ovs_action_push_tnl
*data
,
310 const struct netdev_tnl_build_header_params
*params
);
312 /* build_header() can not build entire header for all packets for given
313 * flow. Push header is called for packet to build header specific to
314 * a packet on actual transmit. It uses partial header build by
315 * build_header() which is passed as data. */
316 void (*push_header
)(struct dp_packet
*packet
,
317 const struct ovs_action_push_tnl
*data
);
319 /* Pop tunnel header from packet, build tunnel metadata and resize packet
320 * for further processing.
321 * Returns NULL in case of error or tunnel implementation queued packet for further
323 struct dp_packet
* (*pop_header
)(struct dp_packet
*packet
);
325 /* Returns the id of the numa node the 'netdev' is on. If there is no
326 * such info, returns NETDEV_NUMA_UNSPEC. */
327 int (*get_numa_id
)(const struct netdev
*netdev
);
329 /* Configures the number of tx queues of 'netdev'. Returns 0 if successful,
330 * otherwise a positive errno value.
332 * 'n_txq' specifies the exact number of transmission queues to create.
334 * The caller will call netdev_reconfigure() (if necessary) before using
335 * netdev_send() on any of the newly configured queues, giving the provider
336 * a chance to adjust its settings.
338 * On error, the tx queue configuration is unchanged. */
339 int (*set_tx_multiq
)(struct netdev
*netdev
, unsigned int n_txq
);
341 /* Sends buffers on 'netdev'.
342 * Returns 0 if successful (for every buffer), otherwise a positive errno
343 * value. Returns EAGAIN without blocking if one or more packets cannot be
344 * queued immediately. Returns EMSGSIZE if a partial packet was transmitted
345 * or if a packet is too big or too small to transmit on the device.
347 * If the function returns a non-zero value, some of the packets might have
350 * If 'may_steal' is false, the caller retains ownership of all the
351 * packets. If 'may_steal' is true, the caller transfers ownership of all
352 * the packets to the network device, regardless of success.
354 * If 'concurrent_txq' is true, the caller may perform concurrent calls
355 * to netdev_send() with the same 'qid'. The netdev provider is responsible
356 * for making sure that these concurrent calls do not create a race
357 * condition by using locking or other synchronization if required.
359 * The network device is expected to maintain one or more packet
360 * transmission queues, so that the caller does not ordinarily have to
361 * do additional queuing of packets. 'qid' specifies the queue to use
362 * and can be ignored if the implementation does not support multiple
365 * May return EOPNOTSUPP if a network device does not implement packet
366 * transmission through this interface. This function may be set to null
367 * if it would always return EOPNOTSUPP anyhow. (This will prevent the
368 * network device from being usefully used by the netdev-based "userspace
369 * datapath". It will also prevent the OVS implementation of bonding from
370 * working properly over 'netdev'.) */
371 int (*send
)(struct netdev
*netdev
, int qid
, struct dp_packet_batch
*batch
,
372 bool may_steal
, bool concurrent_txq
);
374 /* Registers with the poll loop to wake up from the next call to
375 * poll_block() when the packet transmission queue for 'netdev' has
376 * sufficient room to transmit a packet with netdev_send().
378 * The network device is expected to maintain one or more packet
379 * transmission queues, so that the caller does not ordinarily have to
380 * do additional queuing of packets. 'qid' specifies the queue to use
381 * and can be ignored if the implementation does not support multiple
384 * May be null if not needed, such as for a network device that does not
385 * implement packet transmission through the 'send' member function. */
386 void (*send_wait
)(struct netdev
*netdev
, int qid
);
388 /* Sets 'netdev''s Ethernet address to 'mac' */
389 int (*set_etheraddr
)(struct netdev
*netdev
, const struct eth_addr mac
);
391 /* Retrieves 'netdev''s Ethernet address into 'mac'.
393 * This address will be advertised as 'netdev''s MAC address through the
394 * OpenFlow protocol, among other uses. */
395 int (*get_etheraddr
)(const struct netdev
*netdev
, struct eth_addr
*mac
);
397 /* Retrieves 'netdev''s MTU into '*mtup'.
399 * The MTU is the maximum size of transmitted (and received) packets, in
400 * bytes, not including the hardware header; thus, this is typically 1500
401 * bytes for Ethernet devices.
403 * If 'netdev' does not have an MTU (e.g. as some tunnels do not), then
404 * this function should return EOPNOTSUPP. This function may be set to
405 * null if it would always return EOPNOTSUPP. */
406 int (*get_mtu
)(const struct netdev
*netdev
, int *mtup
);
408 /* Sets 'netdev''s MTU to 'mtu'.
410 * If 'netdev' does not have an MTU (e.g. as some tunnels do not), then
411 * this function should return EOPNOTSUPP. This function may be set to
412 * null if it would always return EOPNOTSUPP. */
413 int (*set_mtu
)(struct netdev
*netdev
, int mtu
);
415 /* Returns the ifindex of 'netdev', if successful, as a positive number.
416 * On failure, returns a negative errno value.
418 * The desired semantics of the ifindex value are a combination of those
419 * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An
420 * ifindex value should be unique within a host and remain stable at least
421 * until reboot. SNMP says an ifindex "ranges between 1 and the value of
422 * ifNumber" but many systems do not follow this rule anyhow.
424 * This function may be set to null if it would always return -EOPNOTSUPP.
426 int (*get_ifindex
)(const struct netdev
*netdev
);
428 /* Sets 'carrier' to true if carrier is active (link light is on) on
431 * May be null if device does not provide carrier status (will be always
432 * up as long as device is up).
434 int (*get_carrier
)(const struct netdev
*netdev
, bool *carrier
);
436 /* Returns the number of times 'netdev''s carrier has changed since being
439 * If null, callers will assume the number of carrier resets is zero. */
440 long long int (*get_carrier_resets
)(const struct netdev
*netdev
);
442 /* Forces ->get_carrier() to poll 'netdev''s MII registers for link status
443 * instead of checking 'netdev''s carrier. 'netdev''s MII registers will
444 * be polled once every 'interval' milliseconds. If 'netdev' does not
445 * support MII, another method may be used as a fallback. If 'interval' is
446 * less than or equal to zero, reverts ->get_carrier() to its normal
449 * Most network devices won't support this feature and will set this
450 * function pointer to NULL, which is equivalent to returning EOPNOTSUPP.
452 int (*set_miimon_interval
)(struct netdev
*netdev
, long long int interval
);
454 /* Retrieves current device stats for 'netdev' into 'stats'.
456 * A network device that supports some statistics but not others, it should
457 * set the values of the unsupported statistics to all-1-bits
459 int (*get_stats
)(const struct netdev
*netdev
, struct netdev_stats
*);
461 /* Stores the features supported by 'netdev' into each of '*current',
462 * '*advertised', '*supported', and '*peer'. Each value is a bitmap of
465 * This function may be set to null if it would always return EOPNOTSUPP.
467 int (*get_features
)(const struct netdev
*netdev
,
468 enum netdev_features
*current
,
469 enum netdev_features
*advertised
,
470 enum netdev_features
*supported
,
471 enum netdev_features
*peer
);
473 /* Set the features advertised by 'netdev' to 'advertise', which is a
474 * set of NETDEV_F_* bits.
476 * This function may be set to null for a network device that does not
477 * support configuring advertisements. */
478 int (*set_advertisements
)(struct netdev
*netdev
,
479 enum netdev_features advertise
);
481 /* Returns 'netdev''s configured packet_type mode.
483 * This function may be set to null if it would always return
484 * NETDEV_PT_LEGACY_L2. */
485 enum netdev_pt_mode (*get_pt_mode
)(const struct netdev
*netdev
);
487 /* Attempts to set input rate limiting (policing) policy, such that up to
488 * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative
489 * burst size of 'kbits' kb.
491 * This function may be set to null if policing is not supported. */
492 int (*set_policing
)(struct netdev
*netdev
, unsigned int kbits_rate
,
493 unsigned int kbits_burst
);
495 /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves
496 * it empty if 'netdev' does not support QoS. Any names added to 'types'
497 * should be documented as valid for the "type" column in the "QoS" table
498 * in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
500 * Every network device must support disabling QoS with a type of "", but
501 * this function must not add "" to 'types'.
503 * The caller is responsible for initializing 'types' (e.g. with
504 * sset_init()) before calling this function. The caller retains ownership
507 * May be NULL if 'netdev' does not support QoS at all. */
508 int (*get_qos_types
)(const struct netdev
*netdev
, struct sset
*types
);
510 /* Queries 'netdev' for its capabilities regarding the specified 'type' of
511 * QoS. On success, initializes 'caps' with the QoS capabilities.
513 * Should return EOPNOTSUPP if 'netdev' does not support 'type'. May be
514 * NULL if 'netdev' does not support QoS at all. */
515 int (*get_qos_capabilities
)(const struct netdev
*netdev
,
517 struct netdev_qos_capabilities
*caps
);
519 /* Queries 'netdev' about its currently configured form of QoS. If
520 * successful, stores the name of the current form of QoS into '*typep'
521 * and any details of configuration as string key-value pairs in
524 * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
526 * The caller initializes 'details' before calling this function. The
527 * caller takes ownership of the string key-values pairs added to
530 * The netdev retains ownership of '*typep'.
532 * '*typep' will be one of the types returned by netdev_get_qos_types() for
533 * 'netdev'. The contents of 'details' should be documented as valid for
534 * '*typep' in the "other_config" column in the "QoS" table in
535 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
537 * May be NULL if 'netdev' does not support QoS at all. */
538 int (*get_qos
)(const struct netdev
*netdev
,
539 const char **typep
, struct smap
*details
);
541 /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to
542 * 'type' with details of configuration from 'details'.
544 * On error, the previous QoS configuration is retained.
546 * When this function changes the type of QoS (not just 'details'), this
547 * also resets all queue configuration for 'netdev' to their defaults
548 * (which depend on the specific type of QoS). Otherwise, the queue
549 * configuration for 'netdev' is unchanged.
551 * 'type' should be "" (to disable QoS) or one of the types returned by
552 * netdev_get_qos_types() for 'netdev'. The contents of 'details' should
553 * be documented as valid for the given 'type' in the "other_config" column
554 * in the "QoS" table in vswitchd/vswitch.xml (which is built as
555 * ovs-vswitchd.conf.db(8)).
557 * May be NULL if 'netdev' does not support QoS at all. */
558 int (*set_qos
)(struct netdev
*netdev
,
559 const char *type
, const struct smap
*details
);
561 /* Queries 'netdev' for information about the queue numbered 'queue_id'.
562 * If successful, adds that information as string key-value pairs to
563 * 'details'. Returns 0 if successful, otherwise a positive errno value.
565 * Should return EINVAL if 'queue_id' is greater than or equal to the
566 * number of supported queues (as reported in the 'n_queues' member of
567 * struct netdev_qos_capabilities by 'get_qos_capabilities').
569 * The caller initializes 'details' before calling this function. The
570 * caller takes ownership of the string key-values pairs added to
573 * The returned contents of 'details' should be documented as valid for the
574 * given 'type' in the "other_config" column in the "Queue" table in
575 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
577 int (*get_queue
)(const struct netdev
*netdev
,
578 unsigned int queue_id
, struct smap
*details
);
580 /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
581 * string pairs in 'details'. The contents of 'details' should be
582 * documented as valid for the given 'type' in the "other_config" column in
583 * the "Queue" table in vswitchd/vswitch.xml (which is built as
584 * ovs-vswitchd.conf.db(8)). Returns 0 if successful, otherwise a positive
585 * errno value. On failure, the given queue's configuration should be
588 * Should return EINVAL if 'queue_id' is greater than or equal to the
589 * number of supported queues (as reported in the 'n_queues' member of
590 * struct netdev_qos_capabilities by 'get_qos_capabilities'), or if
591 * 'details' is invalid for the type of queue.
593 * This function does not modify 'details', and the caller retains
596 * May be NULL if 'netdev' does not support QoS at all. */
597 int (*set_queue
)(struct netdev
*netdev
,
598 unsigned int queue_id
, const struct smap
*details
);
600 /* Attempts to delete the queue numbered 'queue_id' from 'netdev'.
602 * Should return EINVAL if 'queue_id' is greater than or equal to the
603 * number of supported queues (as reported in the 'n_queues' member of
604 * struct netdev_qos_capabilities by 'get_qos_capabilities'). Should
605 * return EOPNOTSUPP if 'queue_id' is valid but may not be deleted (e.g. if
606 * 'netdev' has a fixed set of queues with the current QoS mode).
608 * May be NULL if 'netdev' does not support QoS at all, or if all of its
609 * QoS modes have fixed sets of queues. */
610 int (*delete_queue
)(struct netdev
*netdev
, unsigned int queue_id
);
612 /* Obtains statistics about 'queue_id' on 'netdev'. Fills 'stats' with the
613 * queue's statistics. May set individual members of 'stats' to all-1-bits
614 * if the statistic is unavailable.
616 * May be NULL if 'netdev' does not support QoS at all. */
617 int (*get_queue_stats
)(const struct netdev
*netdev
, unsigned int queue_id
,
618 struct netdev_queue_stats
*stats
);
620 /* Attempts to begin dumping the queues in 'netdev'. On success, returns 0
621 * and initializes '*statep' with any data needed for iteration. On
622 * failure, returns a positive errno value.
624 * May be NULL if 'netdev' does not support QoS at all. */
625 int (*queue_dump_start
)(const struct netdev
*netdev
, void **statep
);
627 /* Attempts to retrieve another queue from 'netdev' for 'state', which was
628 * initialized by a successful call to the 'queue_dump_start' function for
629 * 'netdev'. On success, stores a queue ID into '*queue_id' and fills
630 * 'details' with the configuration of the queue with that ID. Returns EOF
631 * if the last queue has been dumped, or a positive errno value on error.
632 * This function will not be called again once it returns nonzero once for
633 * a given iteration (but the 'queue_dump_done' function will be called
636 * The caller initializes and clears 'details' before calling this
637 * function. The caller takes ownership of the string key-values pairs
638 * added to 'details'.
640 * The returned contents of 'details' should be documented as valid for the
641 * given 'type' in the "other_config" column in the "Queue" table in
642 * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
644 * May be NULL if 'netdev' does not support QoS at all. */
645 int (*queue_dump_next
)(const struct netdev
*netdev
, void *state
,
646 unsigned int *queue_id
, struct smap
*details
);
648 /* Releases resources from 'netdev' for 'state', which was initialized by a
649 * successful call to the 'queue_dump_start' function for 'netdev'.
651 * May be NULL if 'netdev' does not support QoS at all. */
652 int (*queue_dump_done
)(const struct netdev
*netdev
, void *state
);
654 /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's
655 * ID, its statistics, and the 'aux' specified by the caller. The order of
656 * iteration is unspecified, but (when successful) each queue must be
657 * visited exactly once.
659 * 'cb' will not modify or free the statistics passed in. */
660 int (*dump_queue_stats
)(const struct netdev
*netdev
,
661 void (*cb
)(unsigned int queue_id
,
662 struct netdev_queue_stats
*,
666 /* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
667 * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared.
669 * This function may be set to null if it would always return EOPNOTSUPP
671 int (*set_in4
)(struct netdev
*netdev
, struct in_addr addr
,
672 struct in_addr mask
);
674 /* Returns all assigned IP address to 'netdev' and returns 0.
675 * API allocates array of address and masks and set it to
676 * '*addr' and '*mask'.
677 * Otherwise, returns a positive errno value and sets '*addr', '*mask
678 * and '*n_addr' to NULL.
680 * The following error values have well-defined meanings:
682 * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
684 * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
686 * 'addr' may be null, in which case the address itself is not reported. */
687 int (*get_addr_list
)(const struct netdev
*netdev
, struct in6_addr
**in
,
688 struct in6_addr
**mask
, int *n_in6
);
690 /* Adds 'router' as a default IP gateway for the TCP/IP stack that
691 * corresponds to 'netdev'.
693 * This function may be set to null if it would always return EOPNOTSUPP
695 int (*add_router
)(struct netdev
*netdev
, struct in_addr router
);
697 /* Looks up the next hop for 'host' in the host's routing table. If
698 * successful, stores the next hop gateway's address (0 if 'host' is on a
699 * directly connected network) in '*next_hop' and a copy of the name of the
700 * device to reach 'host' in '*netdev_name', and returns 0. The caller is
701 * responsible for freeing '*netdev_name' (by calling free()).
703 * This function may be set to null if it would always return EOPNOTSUPP
705 int (*get_next_hop
)(const struct in_addr
*host
, struct in_addr
*next_hop
,
708 /* Retrieves driver information of the device.
710 * Populates 'smap' with key-value pairs representing the status of the
711 * device. 'smap' is a set of key-value string pairs representing netdev
712 * type specific information. For more information see
713 * ovs-vswitchd.conf.db(5).
715 * The caller is responsible for destroying 'smap' and its data.
717 * This function may be set to null if it would always return EOPNOTSUPP
719 int (*get_status
)(const struct netdev
*netdev
, struct smap
*smap
);
721 /* Looks up the ARP table entry for 'ip' on 'netdev' and stores the
722 * corresponding MAC address in 'mac'. A return value of ENXIO, in
723 * particular, indicates that there is no ARP table entry for 'ip' on
726 * This function may be set to null if it would always return EOPNOTSUPP
728 int (*arp_lookup
)(const struct netdev
*netdev
, ovs_be32 ip
,
729 struct eth_addr
*mac
);
731 /* Retrieves the current set of flags on 'netdev' into '*old_flags'. Then,
732 * turns off the flags that are set to 1 in 'off' and turns on the flags
733 * that are set to 1 in 'on'. (No bit will be set to 1 in both 'off' and
734 * 'on'; that is, off & on == 0.)
736 * This function may be invoked from a signal handler. Therefore, it
737 * should not do anything that is not signal-safe (such as logging). */
738 int (*update_flags
)(struct netdev
*netdev
, enum netdev_flags off
,
739 enum netdev_flags on
, enum netdev_flags
*old_flags
);
741 /* If the provider called netdev_request_reconfigure(), the upper layer
742 * will eventually call this. The provider can update the device
743 * configuration knowing that the upper layer will not call rxq_recv() or
744 * send() until this function returns.
746 * On error, the configuration is indeterminant and the device cannot be
747 * used to send and receive packets until a successful configuration is
749 int (*reconfigure
)(struct netdev
*netdev
);
750 /* ## -------------------- ## */
751 /* ## netdev_rxq Functions ## */
752 /* ## -------------------- ## */
754 /* If a particular netdev class does not support receiving packets, all these
755 * function pointers must be NULL. */
757 /* Life-cycle functions for a netdev_rxq. See the large comment above on
758 * struct netdev_class. */
759 struct netdev_rxq
*(*rxq_alloc
)(void);
760 int (*rxq_construct
)(struct netdev_rxq
*);
761 void (*rxq_destruct
)(struct netdev_rxq
*);
762 void (*rxq_dealloc
)(struct netdev_rxq
*);
764 /* Attempts to receive a batch of packets from 'rx'. In 'batch', the
765 * caller supplies 'packets' as the pointer to the beginning of an array
766 * of NETDEV_MAX_BURST pointers to dp_packet. If successful, the
767 * implementation stores pointers to up to NETDEV_MAX_BURST dp_packets into
768 * the array, transferring ownership of the packets to the caller, stores
769 * the number of received packets into 'count', and returns 0.
771 * The implementation does not necessarily initialize any non-data members
772 * of 'packets' in 'batch'. That is, the caller must initialize layer
773 * pointers and metadata itself, if desired, e.g. with pkt_metadata_init()
774 * and miniflow_extract().
776 * Implementations should allocate buffers with DP_NETDEV_HEADROOM bytes of
779 * Returns EAGAIN immediately if no packet is ready to be received or
780 * another positive errno value if an error was encountered. */
781 int (*rxq_recv
)(struct netdev_rxq
*rx
, struct dp_packet_batch
*batch
);
783 /* Registers with the poll loop to wake up from the next call to
784 * poll_block() when a packet is ready to be received with
785 * netdev_rxq_recv() on 'rx'. */
786 void (*rxq_wait
)(struct netdev_rxq
*rx
);
788 /* Discards all packets waiting to be received from 'rx'. */
789 int (*rxq_drain
)(struct netdev_rxq
*rx
);
791 /* ## -------------------------------- ## */
792 /* ## netdev flow offloading functions ## */
793 /* ## -------------------------------- ## */
795 /* If a particular netdev class does not support offloading flows,
796 * all these function pointers must be NULL. */
798 /* Flush all offloaded flows from a netdev.
799 * Return 0 if successful, otherwise returns a positive errno value. */
800 int (*flow_flush
)(struct netdev
*);
802 /* Flow dumping interface.
804 * This is the back-end for the flow dumping interface described in
805 * dpif.h. Please read the comments there first, because this code
806 * closely follows it.
808 * On success returns 0 and allocates data, on failure returns
810 int (*flow_dump_create
)(struct netdev
*, struct netdev_flow_dump
**dump
);
811 int (*flow_dump_destroy
)(struct netdev_flow_dump
*);
813 /* Returns true if there are more flows to dump.
814 * 'rbuffer' is used as a temporary buffer and needs to be pre allocated
815 * by the caller. While there are more flows the same 'rbuffer'
816 * should be provided. 'wbuffer' is used to store dumped actions and needs
817 * to be pre allocated by the caller. */
818 bool (*flow_dump_next
)(struct netdev_flow_dump
*, struct match
*,
819 struct nlattr
**actions
,
820 struct dpif_flow_stats
*stats
, ovs_u128
*ufid
,
821 struct ofpbuf
*rbuffer
, struct ofpbuf
*wbuffer
);
823 /* Offload the given flow on netdev.
824 * To modify a flow, use the same ufid.
825 * 'actions' are in netlink format, as with struct dpif_flow_put.
826 * 'info' is extra info needed to offload the flow.
827 * 'stats' is populated according to the rules set out in the description
828 * above 'struct dpif_flow_put'.
829 * Return 0 if successful, otherwise returns a positive errno value. */
830 int (*flow_put
)(struct netdev
*, struct match
*, struct nlattr
*actions
,
831 size_t actions_len
, const ovs_u128
*ufid
,
832 struct offload_info
*info
, struct dpif_flow_stats
*);
834 /* Queries a flow specified by ufid on netdev.
835 * Fills output buffer as 'wbuffer' in flow_dump_next, which
836 * needs to be be pre allocated.
837 * Return 0 if successful, otherwise returns a positive errno value. */
838 int (*flow_get
)(struct netdev
*, struct match
*, struct nlattr
**actions
,
839 const ovs_u128
*ufid
, struct dpif_flow_stats
*,
840 struct ofpbuf
*wbuffer
);
842 /* Delete a flow specified by ufid from netdev.
843 * 'stats' is populated according to the rules set out in the description
844 * above 'struct dpif_flow_del'.
845 * Return 0 if successful, otherwise returns a positive errno value. */
846 int (*flow_del
)(struct netdev
*, const ovs_u128
*ufid
,
847 struct dpif_flow_stats
*);
849 /* Initializies the netdev flow api.
850 * Return 0 if successful, otherwise returns a positive errno value. */
851 int (*init_flow_api
)(struct netdev
*);
854 int netdev_register_provider(const struct netdev_class
*);
855 int netdev_unregister_provider(const char *type
);
857 #if defined(__FreeBSD__) || defined(__NetBSD__)
858 extern const struct netdev_class netdev_bsd_class
;
859 #elif defined(_WIN32)
860 extern const struct netdev_class netdev_windows_class
;
862 extern const struct netdev_class netdev_linux_class
;
864 extern const struct netdev_class netdev_internal_class
;
865 extern const struct netdev_class netdev_tap_class
;
871 #define NO_OFFLOAD_API NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
873 #endif /* netdev.h */