2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Definitions for the Interfaces handler.
8 * Version: @(#)dev.h 1.0.10 08/12/93
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
14 * Alan Cox, <alan@lxorguk.ukuu.org.uk>
15 * Bjorn Ekwall. <bj0rn@blox.se>
16 * Pekka Riikonen <priikone@poseidon.pspt.fi>
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
23 * Moved to /usr/include/linux for NET3
25 #ifndef _LINUX_NETDEVICE_H
26 #define _LINUX_NETDEVICE_H
29 #include <linux/if_ether.h>
30 #include <linux/if_packet.h>
31 #include <linux/if_link.h>
34 #include <linux/pm_qos_params.h>
35 #include <linux/timer.h>
36 #include <linux/delay.h>
38 #include <asm/atomic.h>
39 #include <asm/cache.h>
40 #include <asm/byteorder.h>
42 #include <linux/device.h>
43 #include <linux/percpu.h>
44 #include <linux/rculist.h>
45 #include <linux/dmaengine.h>
46 #include <linux/workqueue.h>
48 #include <linux/ethtool.h>
49 #include <net/net_namespace.h>
52 #include <net/dcbnl.h>
60 /* source back-compat hooks */
61 #define SET_ETHTOOL_OPS(netdev,ops) \
62 ( (netdev)->ethtool_ops = (ops) )
64 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
65 functions are available. */
66 #define HAVE_FREE_NETDEV /* free_netdev() */
67 #define HAVE_NETDEV_PRIV /* netdev_priv() */
69 /* hardware address assignment types */
70 #define NET_ADDR_PERM 0 /* address is permanent (default) */
71 #define NET_ADDR_RANDOM 1 /* address is generated randomly */
72 #define NET_ADDR_STOLEN 2 /* address is stolen from other device */
74 /* Backlog congestion levels */
75 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
76 #define NET_RX_DROP 1 /* packet dropped */
79 * Transmit return codes: transmit return codes originate from three different
82 * - qdisc return codes
83 * - driver transmit return codes
86 * Drivers are allowed to return any one of those in their hard_start_xmit()
87 * function. Real network devices commonly used with qdiscs should only return
88 * the driver transmit return codes though - when qdiscs are used, the actual
89 * transmission happens asynchronously, so the value is not propagated to
90 * higher layers. Virtual network devices transmit synchronously, in this case
91 * the driver transmit return codes are consumed by dev_queue_xmit(), all
92 * others are propagated to higher layers.
95 /* qdisc ->enqueue() return codes. */
96 #define NET_XMIT_SUCCESS 0x00
97 #define NET_XMIT_DROP 0x01 /* skb dropped */
98 #define NET_XMIT_CN 0x02 /* congestion notification */
99 #define NET_XMIT_POLICED 0x03 /* skb is shot by police */
100 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */
102 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
103 * indicates that the device will soon be dropping packets, or already drops
104 * some packets of the same priority; prompting us to send less aggressively. */
105 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e))
106 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
108 /* Driver transmit return codes */
109 #define NETDEV_TX_MASK 0xf0
112 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */
113 NETDEV_TX_OK = 0x00, /* driver took care of packet */
114 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/
115 NETDEV_TX_LOCKED = 0x20, /* driver tx lock was already taken */
117 typedef enum netdev_tx netdev_tx_t;
120 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
121 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
123 static inline bool dev_xmit_complete(int rc)
126 * Positive cases with an skb consumed by a driver:
127 * - successful transmission (rc == NETDEV_TX_OK)
128 * - error while transmitting (rc < 0)
129 * - error while queueing to a different device (rc & NET_XMIT_MASK)
131 if (likely(rc < NET_XMIT_MASK))
139 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
141 /* Initial net device group. All devices belong to group 0 by default. */
142 #define INIT_NETDEV_GROUP 0
146 * Compute the worst case header length according to the protocols
150 #if defined(CONFIG_WLAN) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
151 # if defined(CONFIG_MAC80211_MESH)
152 # define LL_MAX_HEADER 128
154 # define LL_MAX_HEADER 96
156 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
157 # define LL_MAX_HEADER 48
159 # define LL_MAX_HEADER 32
162 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
163 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
164 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
165 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
166 #define MAX_HEADER LL_MAX_HEADER
168 #define MAX_HEADER (LL_MAX_HEADER + 48)
172 * Old network device statistics. Fields are native words
173 * (unsigned long) so they can be read and written atomically.
176 struct net_device_stats {
177 unsigned long rx_packets;
178 unsigned long tx_packets;
179 unsigned long rx_bytes;
180 unsigned long tx_bytes;
181 unsigned long rx_errors;
182 unsigned long tx_errors;
183 unsigned long rx_dropped;
184 unsigned long tx_dropped;
185 unsigned long multicast;
186 unsigned long collisions;
187 unsigned long rx_length_errors;
188 unsigned long rx_over_errors;
189 unsigned long rx_crc_errors;
190 unsigned long rx_frame_errors;
191 unsigned long rx_fifo_errors;
192 unsigned long rx_missed_errors;
193 unsigned long tx_aborted_errors;
194 unsigned long tx_carrier_errors;
195 unsigned long tx_fifo_errors;
196 unsigned long tx_heartbeat_errors;
197 unsigned long tx_window_errors;
198 unsigned long rx_compressed;
199 unsigned long tx_compressed;
202 #endif /* __KERNEL__ */
205 /* Media selection options. */
218 #include <linux/cache.h>
219 #include <linux/skbuff.h>
225 struct netdev_hw_addr {
226 struct list_head list;
227 unsigned char addr[MAX_ADDR_LEN];
229 #define NETDEV_HW_ADDR_T_LAN 1
230 #define NETDEV_HW_ADDR_T_SAN 2
231 #define NETDEV_HW_ADDR_T_SLAVE 3
232 #define NETDEV_HW_ADDR_T_UNICAST 4
233 #define NETDEV_HW_ADDR_T_MULTICAST 5
237 struct rcu_head rcu_head;
240 struct netdev_hw_addr_list {
241 struct list_head list;
245 #define netdev_hw_addr_list_count(l) ((l)->count)
246 #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
247 #define netdev_hw_addr_list_for_each(ha, l) \
248 list_for_each_entry(ha, &(l)->list, list)
250 #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
251 #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
252 #define netdev_for_each_uc_addr(ha, dev) \
253 netdev_hw_addr_list_for_each(ha, &(dev)->uc)
255 #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
256 #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
257 #define netdev_for_each_mc_addr(ha, dev) \
258 netdev_hw_addr_list_for_each(ha, &(dev)->mc)
261 struct hh_cache *hh_next; /* Next entry */
262 atomic_t hh_refcnt; /* number of users */
264 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
266 * They are mostly read, but hh_refcnt may be changed quite frequently,
267 * incurring cache line ping pongs.
269 __be16 hh_type ____cacheline_aligned_in_smp;
270 /* protocol identifier, f.e ETH_P_IP
271 * NOTE: For VLANs, this will be the
272 * encapuslated type. --BLG
274 u16 hh_len; /* length of header */
275 int (*hh_output)(struct sk_buff *skb);
278 /* cached hardware header; allow for machine alignment needs. */
279 #define HH_DATA_MOD 16
280 #define HH_DATA_OFF(__len) \
281 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
282 #define HH_DATA_ALIGN(__len) \
283 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
284 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
287 static inline void hh_cache_put(struct hh_cache *hh)
289 if (atomic_dec_and_test(&hh->hh_refcnt))
293 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
295 * dev->hard_header_len ? (dev->hard_header_len +
296 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
298 * We could use other alignment values, but we must maintain the
299 * relationship HH alignment <= LL alignment.
301 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
304 #define LL_RESERVED_SPACE(dev) \
305 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
306 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
307 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
308 #define LL_ALLOCATED_SPACE(dev) \
309 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
312 int (*create) (struct sk_buff *skb, struct net_device *dev,
313 unsigned short type, const void *daddr,
314 const void *saddr, unsigned len);
315 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
316 int (*rebuild)(struct sk_buff *skb);
317 #define HAVE_HEADER_CACHE
318 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
319 void (*cache_update)(struct hh_cache *hh,
320 const struct net_device *dev,
321 const unsigned char *haddr);
324 /* These flag bits are private to the generic network queueing
325 * layer, they may not be explicitly referenced by any other
329 enum netdev_state_t {
331 __LINK_STATE_PRESENT,
332 __LINK_STATE_NOCARRIER,
333 __LINK_STATE_LINKWATCH_PENDING,
334 __LINK_STATE_DORMANT,
339 * This structure holds at boot time configured netdevice settings. They
340 * are then used in the device probing.
342 struct netdev_boot_setup {
346 #define NETDEV_BOOT_SETUP_MAX 8
348 extern int __init netdev_boot_setup(char *str);
351 * Structure for NAPI scheduling similar to tasklet but with weighting
354 /* The poll_list must only be managed by the entity which
355 * changes the state of the NAPI_STATE_SCHED bit. This means
356 * whoever atomically sets that bit can add this napi_struct
357 * to the per-cpu poll_list, and whoever clears that bit
358 * can remove from the list right before clearing the bit.
360 struct list_head poll_list;
364 int (*poll)(struct napi_struct *, int);
365 #ifdef CONFIG_NETPOLL
366 spinlock_t poll_lock;
370 unsigned int gro_count;
372 struct net_device *dev;
373 struct list_head dev_list;
374 struct sk_buff *gro_list;
379 NAPI_STATE_SCHED, /* Poll is scheduled */
380 NAPI_STATE_DISABLE, /* Disable pending */
381 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
391 typedef enum gro_result gro_result_t;
394 * enum rx_handler_result - Possible return values for rx_handlers.
395 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
397 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
398 * case skb->dev was changed by rx_handler.
399 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
400 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
402 * rx_handlers are functions called from inside __netif_receive_skb(), to do
403 * special processing of the skb, prior to delivery to protocol handlers.
405 * Currently, a net_device can only have a single rx_handler registered. Trying
406 * to register a second rx_handler will return -EBUSY.
408 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
409 * To unregister a rx_handler on a net_device, use
410 * netdev_rx_handler_unregister().
412 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
415 * If the rx_handler consumed to skb in some way, it should return
416 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
417 * the skb to be delivered in some other ways.
419 * If the rx_handler changed skb->dev, to divert the skb to another
420 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
421 * new device will be called if it exists.
423 * If the rx_handler consider the skb should be ignored, it should return
424 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
425 * are registred on exact device (ptype->dev == skb->dev).
427 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
428 * delivered, it should return RX_HANDLER_PASS.
430 * A device without a registered rx_handler will behave as if rx_handler
431 * returned RX_HANDLER_PASS.
434 enum rx_handler_result {
440 typedef enum rx_handler_result rx_handler_result_t;
441 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
443 extern void __napi_schedule(struct napi_struct *n);
445 static inline int napi_disable_pending(struct napi_struct *n)
447 return test_bit(NAPI_STATE_DISABLE, &n->state);
451 * napi_schedule_prep - check if napi can be scheduled
454 * Test if NAPI routine is already running, and if not mark
455 * it as running. This is used as a condition variable
456 * insure only one NAPI poll instance runs. We also make
457 * sure there is no pending NAPI disable.
459 static inline int napi_schedule_prep(struct napi_struct *n)
461 return !napi_disable_pending(n) &&
462 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
466 * napi_schedule - schedule NAPI poll
469 * Schedule NAPI poll routine to be called if it is not already
472 static inline void napi_schedule(struct napi_struct *n)
474 if (napi_schedule_prep(n))
478 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
479 static inline int napi_reschedule(struct napi_struct *napi)
481 if (napi_schedule_prep(napi)) {
482 __napi_schedule(napi);
489 * napi_complete - NAPI processing complete
492 * Mark NAPI processing as complete.
494 extern void __napi_complete(struct napi_struct *n);
495 extern void napi_complete(struct napi_struct *n);
498 * napi_disable - prevent NAPI from scheduling
501 * Stop NAPI from being scheduled on this context.
502 * Waits till any outstanding processing completes.
504 static inline void napi_disable(struct napi_struct *n)
506 set_bit(NAPI_STATE_DISABLE, &n->state);
507 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
509 clear_bit(NAPI_STATE_DISABLE, &n->state);
513 * napi_enable - enable NAPI scheduling
516 * Resume NAPI from being scheduled on this context.
517 * Must be paired with napi_disable.
519 static inline void napi_enable(struct napi_struct *n)
521 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
522 smp_mb__before_clear_bit();
523 clear_bit(NAPI_STATE_SCHED, &n->state);
528 * napi_synchronize - wait until NAPI is not running
531 * Wait until NAPI is done being scheduled on this context.
532 * Waits till any outstanding processing completes but
533 * does not disable future activations.
535 static inline void napi_synchronize(const struct napi_struct *n)
537 while (test_bit(NAPI_STATE_SCHED, &n->state))
541 # define napi_synchronize(n) barrier()
544 enum netdev_queue_state_t {
546 __QUEUE_STATE_FROZEN,
547 #define QUEUE_STATE_XOFF_OR_FROZEN ((1 << __QUEUE_STATE_XOFF) | \
548 (1 << __QUEUE_STATE_FROZEN))
551 struct netdev_queue {
555 struct net_device *dev;
558 struct Qdisc *qdisc_sleeping;
562 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
568 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
571 * please use this field instead of dev->trans_start
573 unsigned long trans_start;
574 } ____cacheline_aligned_in_smp;
576 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
578 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
585 static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
587 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
594 * This structure holds an RPS map which can be of variable length. The
595 * map is an array of CPUs.
602 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))
605 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
606 * tail pointer for that CPU's input queue at the time of last enqueue, and
607 * a hardware filter index.
609 struct rps_dev_flow {
612 unsigned int last_qtail;
614 #define RPS_NO_FILTER 0xffff
617 * The rps_dev_flow_table structure contains a table of flow mappings.
619 struct rps_dev_flow_table {
622 struct work_struct free_work;
623 struct rps_dev_flow flows[0];
625 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
626 (_num * sizeof(struct rps_dev_flow)))
629 * The rps_sock_flow_table contains mappings of flows to the last CPU
630 * on which they were processed by the application (set in recvmsg).
632 struct rps_sock_flow_table {
636 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
637 (_num * sizeof(u16)))
639 #define RPS_NO_CPU 0xffff
641 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
645 unsigned int cpu, index = hash & table->mask;
647 /* We only give a hint, preemption can change cpu under us */
648 cpu = raw_smp_processor_id();
650 if (table->ents[index] != cpu)
651 table->ents[index] = cpu;
655 static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
659 table->ents[hash & table->mask] = RPS_NO_CPU;
662 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
664 #ifdef CONFIG_RFS_ACCEL
665 extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
666 u32 flow_id, u16 filter_id);
669 /* This structure contains an instance of an RX queue. */
670 struct netdev_rx_queue {
671 struct rps_map __rcu *rps_map;
672 struct rps_dev_flow_table __rcu *rps_flow_table;
674 struct net_device *dev;
675 } ____cacheline_aligned_in_smp;
676 #endif /* CONFIG_RPS */
680 * This structure holds an XPS map which can be of variable length. The
681 * map is an array of queues.
685 unsigned int alloc_len;
689 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + (_num * sizeof(u16)))
690 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map)) \
694 * This structure holds all XPS maps for device. Maps are indexed by CPU.
696 struct xps_dev_maps {
698 struct xps_map __rcu *cpu_map[0];
700 #define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) + \
701 (nr_cpu_ids * sizeof(struct xps_map *)))
702 #endif /* CONFIG_XPS */
704 #define TC_MAX_QUEUE 16
705 #define TC_BITMASK 15
706 /* HW offloaded queuing disciplines txq count and offset maps */
707 struct netdev_tc_txq {
713 * This structure defines the management hooks for network devices.
714 * The following hooks can be defined; unless noted otherwise, they are
715 * optional and can be filled with a null pointer.
717 * int (*ndo_init)(struct net_device *dev);
718 * This function is called once when network device is registered.
719 * The network device can use this to any late stage initializaton
720 * or semantic validattion. It can fail with an error code which will
721 * be propogated back to register_netdev
723 * void (*ndo_uninit)(struct net_device *dev);
724 * This function is called when device is unregistered or when registration
725 * fails. It is not called if init fails.
727 * int (*ndo_open)(struct net_device *dev);
728 * This function is called when network device transistions to the up
731 * int (*ndo_stop)(struct net_device *dev);
732 * This function is called when network device transistions to the down
735 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
736 * struct net_device *dev);
737 * Called when a packet needs to be transmitted.
738 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
739 * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
740 * Required can not be NULL.
742 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
743 * Called to decide which queue to when device supports multiple
746 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
747 * This function is called to allow device receiver to make
748 * changes to configuration when multicast or promiscious is enabled.
750 * void (*ndo_set_rx_mode)(struct net_device *dev);
751 * This function is called device changes address list filtering.
753 * void (*ndo_set_multicast_list)(struct net_device *dev);
754 * This function is called when the multicast address list changes.
756 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
757 * This function is called when the Media Access Control address
758 * needs to be changed. If this interface is not defined, the
759 * mac address can not be changed.
761 * int (*ndo_validate_addr)(struct net_device *dev);
762 * Test if Media Access Control address is valid for the device.
764 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
765 * Called when a user request an ioctl which can't be handled by
766 * the generic interface code. If not defined ioctl's return
767 * not supported error code.
769 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
770 * Used to set network devices bus interface parameters. This interface
771 * is retained for legacy reason, new devices should use the bus
772 * interface (PCI) for low level management.
774 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
775 * Called when a user wants to change the Maximum Transfer Unit
776 * of a device. If not defined, any request to change MTU will
777 * will return an error.
779 * void (*ndo_tx_timeout)(struct net_device *dev);
780 * Callback uses when the transmitter has not made any progress
781 * for dev->watchdog ticks.
783 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
784 * struct rtnl_link_stats64 *storage);
785 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
786 * Called when a user wants to get the network device usage
787 * statistics. Drivers must do one of the following:
788 * 1. Define @ndo_get_stats64 to fill in a zero-initialised
789 * rtnl_link_stats64 structure passed by the caller.
790 * 2. Define @ndo_get_stats to update a net_device_stats structure
791 * (which should normally be dev->stats) and return a pointer to
792 * it. The structure may be changed asynchronously only if each
793 * field is written atomically.
794 * 3. Update dev->stats asynchronously and atomically, and define
797 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
798 * If device support VLAN receive acceleration
799 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
800 * when vlan groups for the device changes. Note: grp is NULL
801 * if no vlan's groups are being used.
803 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
804 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
805 * this function is called when a VLAN id is registered.
807 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
808 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
809 * this function is called when a VLAN id is unregistered.
811 * void (*ndo_poll_controller)(struct net_device *dev);
813 * SR-IOV management functions.
814 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
815 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
816 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
817 * int (*ndo_get_vf_config)(struct net_device *dev,
818 * int vf, struct ifla_vf_info *ivf);
819 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
820 * struct nlattr *port[]);
821 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
822 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
823 * Called to setup 'tc' number of traffic classes in the net device. This
824 * is always called from the stack with the rtnl lock held and netif tx
825 * queues stopped. This allows the netdevice to perform queue management
828 * Fiber Channel over Ethernet (FCoE) offload functions.
829 * int (*ndo_fcoe_enable)(struct net_device *dev);
830 * Called when the FCoE protocol stack wants to start using LLD for FCoE
831 * so the underlying device can perform whatever needed configuration or
832 * initialization to support acceleration of FCoE traffic.
834 * int (*ndo_fcoe_disable)(struct net_device *dev);
835 * Called when the FCoE protocol stack wants to stop using LLD for FCoE
836 * so the underlying device can perform whatever needed clean-ups to
837 * stop supporting acceleration of FCoE traffic.
839 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
840 * struct scatterlist *sgl, unsigned int sgc);
841 * Called when the FCoE Initiator wants to initialize an I/O that
842 * is a possible candidate for Direct Data Placement (DDP). The LLD can
843 * perform necessary setup and returns 1 to indicate the device is set up
844 * successfully to perform DDP on this I/O, otherwise this returns 0.
846 * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid);
847 * Called when the FCoE Initiator/Target is done with the DDPed I/O as
848 * indicated by the FC exchange id 'xid', so the underlying device can
849 * clean up and reuse resources for later DDP requests.
851 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
852 * struct scatterlist *sgl, unsigned int sgc);
853 * Called when the FCoE Target wants to initialize an I/O that
854 * is a possible candidate for Direct Data Placement (DDP). The LLD can
855 * perform necessary setup and returns 1 to indicate the device is set up
856 * successfully to perform DDP on this I/O, otherwise this returns 0.
858 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
859 * Called when the underlying device wants to override default World Wide
860 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own
861 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
862 * protocol stack to use.
865 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
866 * u16 rxq_index, u32 flow_id);
867 * Set hardware filter for RFS. rxq_index is the target queue index;
868 * flow_id is a flow ID to be passed to rps_may_expire_flow() later.
869 * Return the filter ID on success, or a negative error code.
871 * Slave management functions (for bridge, bonding, etc). User should
872 * call netdev_set_master() to set dev->master properly.
873 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
874 * Called to make another netdev an underling.
876 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
877 * Called to release previously enslaved netdev.
879 * Feature/offload setting functions.
880 * u32 (*ndo_fix_features)(struct net_device *dev, u32 features);
881 * Adjusts the requested feature flags according to device-specific
882 * constraints, and returns the resulting flags. Must not modify
885 * int (*ndo_set_features)(struct net_device *dev, u32 features);
886 * Called to update device configuration to new features. Passed
887 * feature set might be less than what was returned by ndo_fix_features()).
888 * Must return >0 or -errno if it changed dev->features itself.
891 #define HAVE_NET_DEVICE_OPS
892 struct net_device_ops {
893 int (*ndo_init)(struct net_device *dev);
894 void (*ndo_uninit)(struct net_device *dev);
895 int (*ndo_open)(struct net_device *dev);
896 int (*ndo_stop)(struct net_device *dev);
897 netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb,
898 struct net_device *dev);
899 u16 (*ndo_select_queue)(struct net_device *dev,
900 struct sk_buff *skb);
901 void (*ndo_change_rx_flags)(struct net_device *dev,
903 void (*ndo_set_rx_mode)(struct net_device *dev);
904 void (*ndo_set_multicast_list)(struct net_device *dev);
905 int (*ndo_set_mac_address)(struct net_device *dev,
907 int (*ndo_validate_addr)(struct net_device *dev);
908 int (*ndo_do_ioctl)(struct net_device *dev,
909 struct ifreq *ifr, int cmd);
910 int (*ndo_set_config)(struct net_device *dev,
912 int (*ndo_change_mtu)(struct net_device *dev,
914 int (*ndo_neigh_setup)(struct net_device *dev,
915 struct neigh_parms *);
916 void (*ndo_tx_timeout) (struct net_device *dev);
918 struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
919 struct rtnl_link_stats64 *storage);
920 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
922 void (*ndo_vlan_rx_register)(struct net_device *dev,
923 struct vlan_group *grp);
924 void (*ndo_vlan_rx_add_vid)(struct net_device *dev,
926 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
928 #ifdef CONFIG_NET_POLL_CONTROLLER
929 void (*ndo_poll_controller)(struct net_device *dev);
930 int (*ndo_netpoll_setup)(struct net_device *dev,
931 struct netpoll_info *info);
932 void (*ndo_netpoll_cleanup)(struct net_device *dev);
934 int (*ndo_set_vf_mac)(struct net_device *dev,
936 int (*ndo_set_vf_vlan)(struct net_device *dev,
937 int queue, u16 vlan, u8 qos);
938 int (*ndo_set_vf_tx_rate)(struct net_device *dev,
940 int (*ndo_get_vf_config)(struct net_device *dev,
942 struct ifla_vf_info *ivf);
943 int (*ndo_set_vf_port)(struct net_device *dev,
945 struct nlattr *port[]);
946 int (*ndo_get_vf_port)(struct net_device *dev,
947 int vf, struct sk_buff *skb);
948 int (*ndo_setup_tc)(struct net_device *dev, u8 tc);
949 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
950 int (*ndo_fcoe_enable)(struct net_device *dev);
951 int (*ndo_fcoe_disable)(struct net_device *dev);
952 int (*ndo_fcoe_ddp_setup)(struct net_device *dev,
954 struct scatterlist *sgl,
956 int (*ndo_fcoe_ddp_done)(struct net_device *dev,
958 int (*ndo_fcoe_ddp_target)(struct net_device *dev,
960 struct scatterlist *sgl,
962 #define NETDEV_FCOE_WWNN 0
963 #define NETDEV_FCOE_WWPN 1
964 int (*ndo_fcoe_get_wwn)(struct net_device *dev,
967 #ifdef CONFIG_RFS_ACCEL
968 int (*ndo_rx_flow_steer)(struct net_device *dev,
969 const struct sk_buff *skb,
973 int (*ndo_add_slave)(struct net_device *dev,
974 struct net_device *slave_dev);
975 int (*ndo_del_slave)(struct net_device *dev,
976 struct net_device *slave_dev);
977 u32 (*ndo_fix_features)(struct net_device *dev,
979 int (*ndo_set_features)(struct net_device *dev,
984 * The DEVICE structure.
985 * Actually, this whole structure is a big mistake. It mixes I/O
986 * data with strictly "high-level" data, and it has to know about
987 * almost every data structure used in the INET module.
989 * FIXME: cleanup struct net_device such that network protocol info
996 * This is the first field of the "visible" part of this structure
997 * (i.e. as seen by users in the "Space.c" file). It is the name
1000 char name[IFNAMSIZ];
1002 struct pm_qos_request_list pm_qos_req;
1004 /* device name hash chain */
1005 struct hlist_node name_hlist;
1010 * I/O specific fields
1011 * FIXME: Merge these and struct ifmap into one
1013 unsigned long mem_end; /* shared mem end */
1014 unsigned long mem_start; /* shared mem start */
1015 unsigned long base_addr; /* device I/O address */
1016 unsigned int irq; /* device IRQ number */
1019 * Some hardware also needs these fields, but they are not
1020 * part of the usual set specified in Space.c.
1023 unsigned long state;
1025 struct list_head dev_list;
1026 struct list_head napi_list;
1027 struct list_head unreg_list;
1029 /* currently active device features */
1031 /* user-changeable features */
1033 /* user-requested features */
1034 u32 wanted_features;
1035 /* mask of features inheritable by VLAN devices */
1038 /* Net device feature bits; if you change something,
1039 * also update netdev_features_strings[] in ethtool.c */
1041 #define NETIF_F_SG 1 /* Scatter/gather IO. */
1042 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
1043 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
1044 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
1045 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
1046 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
1047 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
1048 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
1049 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
1050 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
1051 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
1052 #define NETIF_F_GSO 2048 /* Enable software GSO. */
1053 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
1054 /* do not use LLTX in new drivers */
1055 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
1056 #define NETIF_F_GRO 16384 /* Generic receive offload */
1057 #define NETIF_F_LRO 32768 /* large receive offload */
1059 /* the GSO_MASK reserves bits 16 through 23 */
1060 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */
1061 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */
1062 #define NETIF_F_FCOE_MTU (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
1063 #define NETIF_F_NTUPLE (1 << 27) /* N-tuple filters supported */
1064 #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */
1065 #define NETIF_F_RXCSUM (1 << 29) /* Receive checksumming offload */
1066 #define NETIF_F_NOCACHE_COPY (1 << 30) /* Use no-cache copyfromuser */
1067 #define NETIF_F_LOOPBACK (1 << 31) /* Enable loopback */
1069 /* Segmentation offload features */
1070 #define NETIF_F_GSO_SHIFT 16
1071 #define NETIF_F_GSO_MASK 0x00ff0000
1072 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
1073 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
1074 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
1075 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
1076 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
1077 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
1079 /* Features valid for ethtool to change */
1080 /* = all defined minus driver/device-class-related */
1081 #define NETIF_F_NEVER_CHANGE (NETIF_F_VLAN_CHALLENGED | \
1082 NETIF_F_LLTX | NETIF_F_NETNS_LOCAL)
1083 #define NETIF_F_ETHTOOL_BITS (0xff3fffff & ~NETIF_F_NEVER_CHANGE)
1085 /* List of features with software fallbacks. */
1086 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | \
1087 NETIF_F_TSO6 | NETIF_F_UFO)
1090 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
1091 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
1092 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
1093 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
1095 #define NETIF_F_ALL_TSO (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN)
1097 #define NETIF_F_ALL_FCOE (NETIF_F_FCOE_CRC | NETIF_F_FCOE_MTU | \
1100 #define NETIF_F_ALL_TX_OFFLOADS (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1101 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1103 NETIF_F_SCTP_CSUM | \
1107 * If one device supports one of these features, then enable them
1108 * for all in netdev_increment_features.
1110 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
1111 NETIF_F_SG | NETIF_F_HIGHDMA | \
1112 NETIF_F_FRAGLIST | NETIF_F_VLAN_CHALLENGED)
1114 * If one device doesn't support one of these features, then disable it
1115 * for all in netdev_increment_features.
1117 #define NETIF_F_ALL_FOR_ALL (NETIF_F_NOCACHE_COPY | NETIF_F_FSO)
1119 /* changeable features with no special hardware requirements */
1120 #define NETIF_F_SOFT_FEATURES (NETIF_F_GSO | NETIF_F_GRO)
1122 /* Interface index. Unique device identifier */
1126 struct net_device_stats stats;
1127 atomic_long_t rx_dropped; /* dropped packets by core network
1128 * Do not use this in drivers.
1131 #ifdef CONFIG_WIRELESS_EXT
1132 /* List of functions to handle Wireless Extensions (instead of ioctl).
1133 * See <net/iw_handler.h> for details. Jean II */
1134 const struct iw_handler_def * wireless_handlers;
1135 /* Instance data managed by the core of Wireless Extensions. */
1136 struct iw_public_data * wireless_data;
1138 /* Management operations */
1139 const struct net_device_ops *netdev_ops;
1140 const struct ethtool_ops *ethtool_ops;
1142 /* Hardware header description */
1143 const struct header_ops *header_ops;
1145 unsigned int flags; /* interface flags (a la BSD) */
1146 unsigned int priv_flags; /* Like 'flags' but invisible to userspace. */
1147 unsigned short gflags;
1148 unsigned short padded; /* How much padding added by alloc_netdev() */
1150 unsigned char operstate; /* RFC2863 operstate */
1151 unsigned char link_mode; /* mapping policy to operstate */
1153 unsigned char if_port; /* Selectable AUI, TP,..*/
1154 unsigned char dma; /* DMA channel */
1156 unsigned int mtu; /* interface MTU value */
1157 unsigned short type; /* interface hardware type */
1158 unsigned short hard_header_len; /* hardware hdr length */
1160 /* extra head- and tailroom the hardware may need, but not in all cases
1161 * can this be guaranteed, especially tailroom. Some cases also use
1162 * LL_MAX_HEADER instead to allocate the skb.
1164 unsigned short needed_headroom;
1165 unsigned short needed_tailroom;
1167 /* Interface address info. */
1168 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1169 unsigned char addr_assign_type; /* hw address assignment type */
1170 unsigned char addr_len; /* hardware address length */
1171 unsigned short dev_id; /* for shared network cards */
1173 spinlock_t addr_list_lock;
1174 struct netdev_hw_addr_list uc; /* Unicast mac addresses */
1175 struct netdev_hw_addr_list mc; /* Multicast mac addresses */
1177 unsigned int promiscuity;
1178 unsigned int allmulti;
1181 /* Protocol specific pointers */
1183 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
1184 struct vlan_group __rcu *vlgrp; /* VLAN group */
1186 #ifdef CONFIG_NET_DSA
1187 void *dsa_ptr; /* dsa specific data */
1189 void *atalk_ptr; /* AppleTalk link */
1190 struct in_device __rcu *ip_ptr; /* IPv4 specific data */
1191 struct dn_dev __rcu *dn_ptr; /* DECnet specific data */
1192 struct inet6_dev __rcu *ip6_ptr; /* IPv6 specific data */
1193 void *ec_ptr; /* Econet specific data */
1194 void *ax25_ptr; /* AX.25 specific data */
1195 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
1196 assign before registering */
1199 * Cache lines mostly used on receive path (including eth_type_trans())
1201 unsigned long last_rx; /* Time of last Rx
1202 * This should not be set in
1203 * drivers, unless really needed,
1204 * because network stack (bonding)
1205 * use it if/when necessary, to
1206 * avoid dirtying this cache line.
1209 struct net_device *master; /* Pointer to master device of a group,
1210 * which this device is member of.
1213 /* Interface address info used in eth_type_trans() */
1214 unsigned char *dev_addr; /* hw address, (before bcast
1215 because most packets are
1218 struct netdev_hw_addr_list dev_addrs; /* list of device
1221 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
1224 struct kset *queues_kset;
1226 struct netdev_rx_queue *_rx;
1228 /* Number of RX queues allocated at register_netdev() time */
1229 unsigned int num_rx_queues;
1231 /* Number of RX queues currently active in device */
1232 unsigned int real_num_rx_queues;
1234 #ifdef CONFIG_RFS_ACCEL
1235 /* CPU reverse-mapping for RX completion interrupts, indexed
1236 * by RX queue number. Assigned by driver. This must only be
1237 * set if the ndo_rx_flow_steer operation is defined. */
1238 struct cpu_rmap *rx_cpu_rmap;
1242 rx_handler_func_t __rcu *rx_handler;
1243 void __rcu *rx_handler_data;
1245 struct netdev_queue __rcu *ingress_queue;
1248 * Cache lines mostly used on transmit path
1250 struct netdev_queue *_tx ____cacheline_aligned_in_smp;
1252 /* Number of TX queues allocated at alloc_netdev_mq() time */
1253 unsigned int num_tx_queues;
1255 /* Number of TX queues currently active in device */
1256 unsigned int real_num_tx_queues;
1258 /* root qdisc from userspace point of view */
1259 struct Qdisc *qdisc;
1261 unsigned long tx_queue_len; /* Max frames per queue allowed */
1262 spinlock_t tx_global_lock;
1265 struct xps_dev_maps __rcu *xps_maps;
1268 /* These may be needed for future network-power-down code. */
1271 * trans_start here is expensive for high speed devices on SMP,
1272 * please use netdev_queue->trans_start instead.
1274 unsigned long trans_start; /* Time (in jiffies) of last Tx */
1276 int watchdog_timeo; /* used by dev_watchdog() */
1277 struct timer_list watchdog_timer;
1279 /* Number of references to this device */
1280 int __percpu *pcpu_refcnt;
1282 /* delayed register/unregister */
1283 struct list_head todo_list;
1284 /* device index hash chain */
1285 struct hlist_node index_hlist;
1287 struct list_head link_watch_list;
1289 /* register/unregister state machine */
1290 enum { NETREG_UNINITIALIZED=0,
1291 NETREG_REGISTERED, /* completed register_netdevice */
1292 NETREG_UNREGISTERING, /* called unregister_netdevice */
1293 NETREG_UNREGISTERED, /* completed unregister todo */
1294 NETREG_RELEASED, /* called free_netdev */
1295 NETREG_DUMMY, /* dummy device for NAPI poll */
1298 bool dismantle; /* device is going do be freed */
1301 RTNL_LINK_INITIALIZED,
1302 RTNL_LINK_INITIALIZING,
1303 } rtnl_link_state:16;
1305 /* Called from unregister, can be used to call free_netdev */
1306 void (*destructor)(struct net_device *dev);
1308 #ifdef CONFIG_NETPOLL
1309 struct netpoll_info *npinfo;
1312 #ifdef CONFIG_NET_NS
1313 /* Network namespace this network device is inside */
1317 /* mid-layer private */
1320 struct pcpu_lstats __percpu *lstats; /* loopback stats */
1321 struct pcpu_tstats __percpu *tstats; /* tunnel stats */
1322 struct pcpu_dstats __percpu *dstats; /* dummy stats */
1325 struct garp_port __rcu *garp_port;
1327 /* class/net/name entry */
1329 /* space for optional device, statistics, and wireless sysfs groups */
1330 const struct attribute_group *sysfs_groups[4];
1332 /* rtnetlink link ops */
1333 const struct rtnl_link_ops *rtnl_link_ops;
1335 /* for setting kernel sock attribute on TCP connection setup */
1336 #define GSO_MAX_SIZE 65536
1337 unsigned int gso_max_size;
1340 /* Data Center Bridging netlink ops */
1341 const struct dcbnl_rtnl_ops *dcbnl_ops;
1344 struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
1345 u8 prio_tc_map[TC_BITMASK + 1];
1347 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
1348 /* max exchange id for FCoE LRO by ddp */
1349 unsigned int fcoe_ddp_xid;
1351 /* n-tuple filter list attached to this device */
1352 struct ethtool_rx_ntuple_list ethtool_ntuple_list;
1354 /* phy device may attach itself for hardware timestamping */
1355 struct phy_device *phydev;
1357 /* group the device belongs to */
1360 #define to_net_dev(d) container_of(d, struct net_device, dev)
1362 #define NETDEV_ALIGN 32
1365 int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
1367 return dev->prio_tc_map[prio & TC_BITMASK];
1371 int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
1373 if (tc >= dev->num_tc)
1376 dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
1381 void netdev_reset_tc(struct net_device *dev)
1384 memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
1385 memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
1389 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
1391 if (tc >= dev->num_tc)
1394 dev->tc_to_txq[tc].count = count;
1395 dev->tc_to_txq[tc].offset = offset;
1400 int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
1402 if (num_tc > TC_MAX_QUEUE)
1405 dev->num_tc = num_tc;
1410 int netdev_get_num_tc(struct net_device *dev)
1416 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
1419 return &dev->_tx[index];
1422 static inline void netdev_for_each_tx_queue(struct net_device *dev,
1423 void (*f)(struct net_device *,
1424 struct netdev_queue *,
1430 for (i = 0; i < dev->num_tx_queues; i++)
1431 f(dev, &dev->_tx[i], arg);
1435 * Net namespace inlines
1438 struct net *dev_net(const struct net_device *dev)
1440 return read_pnet(&dev->nd_net);
1444 void dev_net_set(struct net_device *dev, struct net *net)
1446 #ifdef CONFIG_NET_NS
1447 release_net(dev->nd_net);
1448 dev->nd_net = hold_net(net);
1452 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1454 #ifdef CONFIG_NET_DSA_TAG_DSA
1455 if (dev->dsa_ptr != NULL)
1456 return dsa_uses_dsa_tags(dev->dsa_ptr);
1462 #ifndef CONFIG_NET_NS
1463 static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1467 #else /* CONFIG_NET_NS */
1468 void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
1471 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1473 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1474 if (dev->dsa_ptr != NULL)
1475 return dsa_uses_trailer_tags(dev->dsa_ptr);
1482 * netdev_priv - access network device private data
1483 * @dev: network device
1485 * Get network device private data
1487 static inline void *netdev_priv(const struct net_device *dev)
1489 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1492 /* Set the sysfs physical device reference for the network logical device
1493 * if set prior to registration will cause a symlink during initialization.
1495 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
1497 /* Set the sysfs device type for the network logical device to allow
1498 * fin grained indentification of different network device types. For
1499 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1501 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype))
1504 * netif_napi_add - initialize a napi context
1505 * @dev: network device
1506 * @napi: napi context
1507 * @poll: polling function
1508 * @weight: default weight
1510 * netif_napi_add() must be used to initialize a napi context prior to calling
1511 * *any* of the other napi related functions.
1513 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1514 int (*poll)(struct napi_struct *, int), int weight);
1517 * netif_napi_del - remove a napi context
1518 * @napi: napi context
1520 * netif_napi_del() removes a napi context from the network device napi list
1522 void netif_napi_del(struct napi_struct *napi);
1524 struct napi_gro_cb {
1525 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1528 /* Length of frag0. */
1529 unsigned int frag0_len;
1531 /* This indicates where we are processing relative to skb->data. */
1534 /* This is non-zero if the packet may be of the same flow. */
1537 /* This is non-zero if the packet cannot be merged with the new skb. */
1540 /* Number of segments aggregated. */
1547 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1549 struct packet_type {
1550 __be16 type; /* This is really htons(ether_type). */
1551 struct net_device *dev; /* NULL is wildcarded here */
1552 int (*func) (struct sk_buff *,
1553 struct net_device *,
1554 struct packet_type *,
1555 struct net_device *);
1556 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
1558 int (*gso_send_check)(struct sk_buff *skb);
1559 struct sk_buff **(*gro_receive)(struct sk_buff **head,
1560 struct sk_buff *skb);
1561 int (*gro_complete)(struct sk_buff *skb);
1562 void *af_packet_priv;
1563 struct list_head list;
1566 #include <linux/interrupt.h>
1567 #include <linux/notifier.h>
1569 extern rwlock_t dev_base_lock; /* Device list lock */
1572 #define for_each_netdev(net, d) \
1573 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1574 #define for_each_netdev_reverse(net, d) \
1575 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1576 #define for_each_netdev_rcu(net, d) \
1577 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1578 #define for_each_netdev_safe(net, d, n) \
1579 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1580 #define for_each_netdev_continue(net, d) \
1581 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1582 #define for_each_netdev_continue_rcu(net, d) \
1583 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1584 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
1586 static inline struct net_device *next_net_device(struct net_device *dev)
1588 struct list_head *lh;
1592 lh = dev->dev_list.next;
1593 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1596 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1598 struct list_head *lh;
1602 lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1603 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1606 static inline struct net_device *first_net_device(struct net *net)
1608 return list_empty(&net->dev_base_head) ? NULL :
1609 net_device_entry(net->dev_base_head.next);
1612 static inline struct net_device *first_net_device_rcu(struct net *net)
1614 struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
1616 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1619 extern int netdev_boot_setup_check(struct net_device *dev);
1620 extern unsigned long netdev_boot_base(const char *prefix, int unit);
1621 extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
1622 const char *hwaddr);
1623 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1624 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1625 extern void dev_add_pack(struct packet_type *pt);
1626 extern void dev_remove_pack(struct packet_type *pt);
1627 extern void __dev_remove_pack(struct packet_type *pt);
1629 extern struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
1630 unsigned short mask);
1631 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
1632 extern struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
1633 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
1634 extern int dev_alloc_name(struct net_device *dev, const char *name);
1635 extern int dev_open(struct net_device *dev);
1636 extern int dev_close(struct net_device *dev);
1637 extern void dev_disable_lro(struct net_device *dev);
1638 extern int dev_queue_xmit(struct sk_buff *skb);
1639 extern int register_netdevice(struct net_device *dev);
1640 extern void unregister_netdevice_queue(struct net_device *dev,
1641 struct list_head *head);
1642 extern void unregister_netdevice_many(struct list_head *head);
1643 static inline void unregister_netdevice(struct net_device *dev)
1645 unregister_netdevice_queue(dev, NULL);
1648 extern int netdev_refcnt_read(const struct net_device *dev);
1649 extern void free_netdev(struct net_device *dev);
1650 extern void synchronize_net(void);
1651 extern int register_netdevice_notifier(struct notifier_block *nb);
1652 extern int unregister_netdevice_notifier(struct notifier_block *nb);
1653 extern int init_dummy_netdev(struct net_device *dev);
1654 extern void netdev_resync_ops(struct net_device *dev);
1656 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1657 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
1658 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
1659 extern struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
1660 extern int dev_restart(struct net_device *dev);
1661 #ifdef CONFIG_NETPOLL_TRAP
1662 extern int netpoll_trap(void);
1664 extern int skb_gro_receive(struct sk_buff **head,
1665 struct sk_buff *skb);
1666 extern void skb_gro_reset_offset(struct sk_buff *skb);
1668 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1670 return NAPI_GRO_CB(skb)->data_offset;
1673 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1675 return skb->len - NAPI_GRO_CB(skb)->data_offset;
1678 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1680 NAPI_GRO_CB(skb)->data_offset += len;
1683 static inline void *skb_gro_header_fast(struct sk_buff *skb,
1684 unsigned int offset)
1686 return NAPI_GRO_CB(skb)->frag0 + offset;
1689 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1691 return NAPI_GRO_CB(skb)->frag0_len < hlen;
1694 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1695 unsigned int offset)
1697 NAPI_GRO_CB(skb)->frag0 = NULL;
1698 NAPI_GRO_CB(skb)->frag0_len = 0;
1699 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1702 static inline void *skb_gro_mac_header(struct sk_buff *skb)
1704 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1707 static inline void *skb_gro_network_header(struct sk_buff *skb)
1709 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1710 skb_network_offset(skb);
1713 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1714 unsigned short type,
1715 const void *daddr, const void *saddr,
1718 if (!dev->header_ops || !dev->header_ops->create)
1721 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1724 static inline int dev_parse_header(const struct sk_buff *skb,
1725 unsigned char *haddr)
1727 const struct net_device *dev = skb->dev;
1729 if (!dev->header_ops || !dev->header_ops->parse)
1731 return dev->header_ops->parse(skb, haddr);
1734 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1735 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1736 static inline int unregister_gifconf(unsigned int family)
1738 return register_gifconf(family, NULL);
1742 * Incoming packets are placed on per-cpu queues
1744 struct softnet_data {
1745 struct Qdisc *output_queue;
1746 struct Qdisc **output_queue_tailp;
1747 struct list_head poll_list;
1748 struct sk_buff *completion_queue;
1749 struct sk_buff_head process_queue;
1752 unsigned int processed;
1753 unsigned int time_squeeze;
1754 unsigned int cpu_collision;
1755 unsigned int received_rps;
1758 struct softnet_data *rps_ipi_list;
1760 /* Elements below can be accessed between CPUs for RPS */
1761 struct call_single_data csd ____cacheline_aligned_in_smp;
1762 struct softnet_data *rps_ipi_next;
1764 unsigned int input_queue_head;
1765 unsigned int input_queue_tail;
1768 struct sk_buff_head input_pkt_queue;
1769 struct napi_struct backlog;
1772 static inline void input_queue_head_incr(struct softnet_data *sd)
1775 sd->input_queue_head++;
1779 static inline void input_queue_tail_incr_save(struct softnet_data *sd,
1780 unsigned int *qtail)
1783 *qtail = ++sd->input_queue_tail;
1787 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
1789 #define HAVE_NETIF_QUEUE
1791 extern void __netif_schedule(struct Qdisc *q);
1793 static inline void netif_schedule_queue(struct netdev_queue *txq)
1795 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1796 __netif_schedule(txq->qdisc);
1799 static inline void netif_tx_schedule_all(struct net_device *dev)
1803 for (i = 0; i < dev->num_tx_queues; i++)
1804 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1807 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1809 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1813 * netif_start_queue - allow transmit
1814 * @dev: network device
1816 * Allow upper layers to call the device hard_start_xmit routine.
1818 static inline void netif_start_queue(struct net_device *dev)
1820 netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1823 static inline void netif_tx_start_all_queues(struct net_device *dev)
1827 for (i = 0; i < dev->num_tx_queues; i++) {
1828 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1829 netif_tx_start_queue(txq);
1833 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1835 #ifdef CONFIG_NETPOLL_TRAP
1836 if (netpoll_trap()) {
1837 netif_tx_start_queue(dev_queue);
1841 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1842 __netif_schedule(dev_queue->qdisc);
1846 * netif_wake_queue - restart transmit
1847 * @dev: network device
1849 * Allow upper layers to call the device hard_start_xmit routine.
1850 * Used for flow control when transmit resources are available.
1852 static inline void netif_wake_queue(struct net_device *dev)
1854 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1857 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1861 for (i = 0; i < dev->num_tx_queues; i++) {
1862 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1863 netif_tx_wake_queue(txq);
1867 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1869 if (WARN_ON(!dev_queue)) {
1870 pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1873 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1877 * netif_stop_queue - stop transmitted packets
1878 * @dev: network device
1880 * Stop upper layers calling the device hard_start_xmit routine.
1881 * Used for flow control when transmit resources are unavailable.
1883 static inline void netif_stop_queue(struct net_device *dev)
1885 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1888 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1892 for (i = 0; i < dev->num_tx_queues; i++) {
1893 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1894 netif_tx_stop_queue(txq);
1898 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1900 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1904 * netif_queue_stopped - test if transmit queue is flowblocked
1905 * @dev: network device
1907 * Test if transmit queue on device is currently unable to send.
1909 static inline int netif_queue_stopped(const struct net_device *dev)
1911 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1914 static inline int netif_tx_queue_frozen_or_stopped(const struct netdev_queue *dev_queue)
1916 return dev_queue->state & QUEUE_STATE_XOFF_OR_FROZEN;
1920 * netif_running - test if up
1921 * @dev: network device
1923 * Test if the device has been brought up.
1925 static inline int netif_running(const struct net_device *dev)
1927 return test_bit(__LINK_STATE_START, &dev->state);
1931 * Routines to manage the subqueues on a device. We only need start
1932 * stop, and a check if it's stopped. All other device management is
1933 * done at the overall netdevice level.
1934 * Also test the device if we're multiqueue.
1938 * netif_start_subqueue - allow sending packets on subqueue
1939 * @dev: network device
1940 * @queue_index: sub queue index
1942 * Start individual transmit queue of a device with multiple transmit queues.
1944 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1946 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1948 netif_tx_start_queue(txq);
1952 * netif_stop_subqueue - stop sending packets on subqueue
1953 * @dev: network device
1954 * @queue_index: sub queue index
1956 * Stop individual transmit queue of a device with multiple transmit queues.
1958 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1960 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1961 #ifdef CONFIG_NETPOLL_TRAP
1965 netif_tx_stop_queue(txq);
1969 * netif_subqueue_stopped - test status of subqueue
1970 * @dev: network device
1971 * @queue_index: sub queue index
1973 * Check individual transmit queue of a device with multiple transmit queues.
1975 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1978 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1980 return netif_tx_queue_stopped(txq);
1983 static inline int netif_subqueue_stopped(const struct net_device *dev,
1984 struct sk_buff *skb)
1986 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1990 * netif_wake_subqueue - allow sending packets on subqueue
1991 * @dev: network device
1992 * @queue_index: sub queue index
1994 * Resume individual transmit queue of a device with multiple transmit queues.
1996 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1998 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1999 #ifdef CONFIG_NETPOLL_TRAP
2003 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
2004 __netif_schedule(txq->qdisc);
2008 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
2009 * as a distribution range limit for the returned value.
2011 static inline u16 skb_tx_hash(const struct net_device *dev,
2012 const struct sk_buff *skb)
2014 return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
2018 * netif_is_multiqueue - test if device has multiple transmit queues
2019 * @dev: network device
2021 * Check if device has multiple transmit queues
2023 static inline int netif_is_multiqueue(const struct net_device *dev)
2025 return dev->num_tx_queues > 1;
2028 extern int netif_set_real_num_tx_queues(struct net_device *dev,
2032 extern int netif_set_real_num_rx_queues(struct net_device *dev,
2035 static inline int netif_set_real_num_rx_queues(struct net_device *dev,
2042 static inline int netif_copy_real_num_queues(struct net_device *to_dev,
2043 const struct net_device *from_dev)
2045 netif_set_real_num_tx_queues(to_dev, from_dev->real_num_tx_queues);
2047 return netif_set_real_num_rx_queues(to_dev,
2048 from_dev->real_num_rx_queues);
2054 /* Use this variant when it is known for sure that it
2055 * is executing from hardware interrupt context or with hardware interrupts
2058 extern void dev_kfree_skb_irq(struct sk_buff *skb);
2060 /* Use this variant in places where it could be invoked
2061 * from either hardware interrupt or other context, with hardware interrupts
2062 * either disabled or enabled.
2064 extern void dev_kfree_skb_any(struct sk_buff *skb);
2066 #define HAVE_NETIF_RX 1
2067 extern int netif_rx(struct sk_buff *skb);
2068 extern int netif_rx_ni(struct sk_buff *skb);
2069 #define HAVE_NETIF_RECEIVE_SKB 1
2070 extern int netif_receive_skb(struct sk_buff *skb);
2071 extern gro_result_t dev_gro_receive(struct napi_struct *napi,
2072 struct sk_buff *skb);
2073 extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
2074 extern gro_result_t napi_gro_receive(struct napi_struct *napi,
2075 struct sk_buff *skb);
2076 extern void napi_gro_flush(struct napi_struct *napi);
2077 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
2078 extern gro_result_t napi_frags_finish(struct napi_struct *napi,
2079 struct sk_buff *skb,
2081 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
2082 extern gro_result_t napi_gro_frags(struct napi_struct *napi);
2084 static inline void napi_free_frags(struct napi_struct *napi)
2086 kfree_skb(napi->skb);
2090 extern int netdev_rx_handler_register(struct net_device *dev,
2091 rx_handler_func_t *rx_handler,
2092 void *rx_handler_data);
2093 extern void netdev_rx_handler_unregister(struct net_device *dev);
2095 extern int dev_valid_name(const char *name);
2096 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
2097 extern int dev_ethtool(struct net *net, struct ifreq *);
2098 extern unsigned dev_get_flags(const struct net_device *);
2099 extern int __dev_change_flags(struct net_device *, unsigned int flags);
2100 extern int dev_change_flags(struct net_device *, unsigned);
2101 extern void __dev_notify_flags(struct net_device *, unsigned int old_flags);
2102 extern int dev_change_name(struct net_device *, const char *);
2103 extern int dev_set_alias(struct net_device *, const char *, size_t);
2104 extern int dev_change_net_namespace(struct net_device *,
2105 struct net *, const char *);
2106 extern int dev_set_mtu(struct net_device *, int);
2107 extern void dev_set_group(struct net_device *, int);
2108 extern int dev_set_mac_address(struct net_device *,
2110 extern int dev_hard_start_xmit(struct sk_buff *skb,
2111 struct net_device *dev,
2112 struct netdev_queue *txq);
2113 extern int dev_forward_skb(struct net_device *dev,
2114 struct sk_buff *skb);
2116 extern int netdev_budget;
2118 /* Called by rtnetlink.c:rtnl_unlock() */
2119 extern void netdev_run_todo(void);
2122 * dev_put - release reference to device
2123 * @dev: network device
2125 * Release reference to device to allow it to be freed.
2127 static inline void dev_put(struct net_device *dev)
2129 irqsafe_cpu_dec(*dev->pcpu_refcnt);
2133 * dev_hold - get reference to device
2134 * @dev: network device
2136 * Hold reference to device to keep it from being freed.
2138 static inline void dev_hold(struct net_device *dev)
2140 irqsafe_cpu_inc(*dev->pcpu_refcnt);
2143 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
2144 * and _off may be called from IRQ context, but it is caller
2145 * who is responsible for serialization of these calls.
2147 * The name carrier is inappropriate, these functions should really be
2148 * called netif_lowerlayer_*() because they represent the state of any
2149 * kind of lower layer not just hardware media.
2152 extern void linkwatch_fire_event(struct net_device *dev);
2153 extern void linkwatch_forget_dev(struct net_device *dev);
2156 * netif_carrier_ok - test if carrier present
2157 * @dev: network device
2159 * Check if carrier is present on device
2161 static inline int netif_carrier_ok(const struct net_device *dev)
2163 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
2166 extern unsigned long dev_trans_start(struct net_device *dev);
2168 extern void __netdev_watchdog_up(struct net_device *dev);
2170 extern void netif_carrier_on(struct net_device *dev);
2172 extern void netif_carrier_off(struct net_device *dev);
2174 extern void netif_notify_peers(struct net_device *dev);
2177 * netif_dormant_on - mark device as dormant.
2178 * @dev: network device
2180 * Mark device as dormant (as per RFC2863).
2182 * The dormant state indicates that the relevant interface is not
2183 * actually in a condition to pass packets (i.e., it is not 'up') but is
2184 * in a "pending" state, waiting for some external event. For "on-
2185 * demand" interfaces, this new state identifies the situation where the
2186 * interface is waiting for events to place it in the up state.
2189 static inline void netif_dormant_on(struct net_device *dev)
2191 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
2192 linkwatch_fire_event(dev);
2196 * netif_dormant_off - set device as not dormant.
2197 * @dev: network device
2199 * Device is not in dormant state.
2201 static inline void netif_dormant_off(struct net_device *dev)
2203 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
2204 linkwatch_fire_event(dev);
2208 * netif_dormant - test if carrier present
2209 * @dev: network device
2211 * Check if carrier is present on device
2213 static inline int netif_dormant(const struct net_device *dev)
2215 return test_bit(__LINK_STATE_DORMANT, &dev->state);
2220 * netif_oper_up - test if device is operational
2221 * @dev: network device
2223 * Check if carrier is operational
2225 static inline int netif_oper_up(const struct net_device *dev)
2227 return (dev->operstate == IF_OPER_UP ||
2228 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
2232 * netif_device_present - is device available or removed
2233 * @dev: network device
2235 * Check if device has not been removed from system.
2237 static inline int netif_device_present(struct net_device *dev)
2239 return test_bit(__LINK_STATE_PRESENT, &dev->state);
2242 extern void netif_device_detach(struct net_device *dev);
2244 extern void netif_device_attach(struct net_device *dev);
2247 * Network interface message level settings
2249 #define HAVE_NETIF_MSG 1
2252 NETIF_MSG_DRV = 0x0001,
2253 NETIF_MSG_PROBE = 0x0002,
2254 NETIF_MSG_LINK = 0x0004,
2255 NETIF_MSG_TIMER = 0x0008,
2256 NETIF_MSG_IFDOWN = 0x0010,
2257 NETIF_MSG_IFUP = 0x0020,
2258 NETIF_MSG_RX_ERR = 0x0040,
2259 NETIF_MSG_TX_ERR = 0x0080,
2260 NETIF_MSG_TX_QUEUED = 0x0100,
2261 NETIF_MSG_INTR = 0x0200,
2262 NETIF_MSG_TX_DONE = 0x0400,
2263 NETIF_MSG_RX_STATUS = 0x0800,
2264 NETIF_MSG_PKTDATA = 0x1000,
2265 NETIF_MSG_HW = 0x2000,
2266 NETIF_MSG_WOL = 0x4000,
2269 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
2270 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
2271 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
2272 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
2273 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
2274 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
2275 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
2276 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
2277 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
2278 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
2279 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
2280 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
2281 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
2282 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
2283 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
2285 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
2288 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
2289 return default_msg_enable_bits;
2290 if (debug_value == 0) /* no output */
2292 /* set low N bits */
2293 return (1 << debug_value) - 1;
2296 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
2298 spin_lock(&txq->_xmit_lock);
2299 txq->xmit_lock_owner = cpu;
2302 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
2304 spin_lock_bh(&txq->_xmit_lock);
2305 txq->xmit_lock_owner = smp_processor_id();
2308 static inline int __netif_tx_trylock(struct netdev_queue *txq)
2310 int ok = spin_trylock(&txq->_xmit_lock);
2312 txq->xmit_lock_owner = smp_processor_id();
2316 static inline void __netif_tx_unlock(struct netdev_queue *txq)
2318 txq->xmit_lock_owner = -1;
2319 spin_unlock(&txq->_xmit_lock);
2322 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
2324 txq->xmit_lock_owner = -1;
2325 spin_unlock_bh(&txq->_xmit_lock);
2328 static inline void txq_trans_update(struct netdev_queue *txq)
2330 if (txq->xmit_lock_owner != -1)
2331 txq->trans_start = jiffies;
2335 * netif_tx_lock - grab network device transmit lock
2336 * @dev: network device
2338 * Get network device transmit lock
2340 static inline void netif_tx_lock(struct net_device *dev)
2345 spin_lock(&dev->tx_global_lock);
2346 cpu = smp_processor_id();
2347 for (i = 0; i < dev->num_tx_queues; i++) {
2348 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2350 /* We are the only thread of execution doing a
2351 * freeze, but we have to grab the _xmit_lock in
2352 * order to synchronize with threads which are in
2353 * the ->hard_start_xmit() handler and already
2354 * checked the frozen bit.
2356 __netif_tx_lock(txq, cpu);
2357 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
2358 __netif_tx_unlock(txq);
2362 static inline void netif_tx_lock_bh(struct net_device *dev)
2368 static inline void netif_tx_unlock(struct net_device *dev)
2372 for (i = 0; i < dev->num_tx_queues; i++) {
2373 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2375 /* No need to grab the _xmit_lock here. If the
2376 * queue is not stopped for another reason, we
2379 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
2380 netif_schedule_queue(txq);
2382 spin_unlock(&dev->tx_global_lock);
2385 static inline void netif_tx_unlock_bh(struct net_device *dev)
2387 netif_tx_unlock(dev);
2391 #define HARD_TX_LOCK(dev, txq, cpu) { \
2392 if ((dev->features & NETIF_F_LLTX) == 0) { \
2393 __netif_tx_lock(txq, cpu); \
2397 #define HARD_TX_UNLOCK(dev, txq) { \
2398 if ((dev->features & NETIF_F_LLTX) == 0) { \
2399 __netif_tx_unlock(txq); \
2403 static inline void netif_tx_disable(struct net_device *dev)
2409 cpu = smp_processor_id();
2410 for (i = 0; i < dev->num_tx_queues; i++) {
2411 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2413 __netif_tx_lock(txq, cpu);
2414 netif_tx_stop_queue(txq);
2415 __netif_tx_unlock(txq);
2420 static inline void netif_addr_lock(struct net_device *dev)
2422 spin_lock(&dev->addr_list_lock);
2425 static inline void netif_addr_lock_bh(struct net_device *dev)
2427 spin_lock_bh(&dev->addr_list_lock);
2430 static inline void netif_addr_unlock(struct net_device *dev)
2432 spin_unlock(&dev->addr_list_lock);
2435 static inline void netif_addr_unlock_bh(struct net_device *dev)
2437 spin_unlock_bh(&dev->addr_list_lock);
2441 * dev_addrs walker. Should be used only for read access. Call with
2442 * rcu_read_lock held.
2444 #define for_each_dev_addr(dev, ha) \
2445 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2447 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
2449 extern void ether_setup(struct net_device *dev);
2451 /* Support for loadable net-drivers */
2452 extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2453 void (*setup)(struct net_device *),
2454 unsigned int txqs, unsigned int rxqs);
2455 #define alloc_netdev(sizeof_priv, name, setup) \
2456 alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
2458 #define alloc_netdev_mq(sizeof_priv, name, setup, count) \
2459 alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
2461 extern int register_netdev(struct net_device *dev);
2462 extern void unregister_netdev(struct net_device *dev);
2464 /* General hardware address lists handling functions */
2465 extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
2466 struct netdev_hw_addr_list *from_list,
2467 int addr_len, unsigned char addr_type);
2468 extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
2469 struct netdev_hw_addr_list *from_list,
2470 int addr_len, unsigned char addr_type);
2471 extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
2472 struct netdev_hw_addr_list *from_list,
2474 extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
2475 struct netdev_hw_addr_list *from_list,
2477 extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
2478 extern void __hw_addr_init(struct netdev_hw_addr_list *list);
2480 /* Functions used for device addresses handling */
2481 extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
2482 unsigned char addr_type);
2483 extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
2484 unsigned char addr_type);
2485 extern int dev_addr_add_multiple(struct net_device *to_dev,
2486 struct net_device *from_dev,
2487 unsigned char addr_type);
2488 extern int dev_addr_del_multiple(struct net_device *to_dev,
2489 struct net_device *from_dev,
2490 unsigned char addr_type);
2491 extern void dev_addr_flush(struct net_device *dev);
2492 extern int dev_addr_init(struct net_device *dev);
2494 /* Functions used for unicast addresses handling */
2495 extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
2496 extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
2497 extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2498 extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
2499 extern void dev_uc_flush(struct net_device *dev);
2500 extern void dev_uc_init(struct net_device *dev);
2502 /* Functions used for multicast addresses handling */
2503 extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
2504 extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
2505 extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
2506 extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
2507 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2508 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
2509 extern void dev_mc_flush(struct net_device *dev);
2510 extern void dev_mc_init(struct net_device *dev);
2512 /* Functions used for secondary unicast and multicast support */
2513 extern void dev_set_rx_mode(struct net_device *dev);
2514 extern void __dev_set_rx_mode(struct net_device *dev);
2515 extern int dev_set_promiscuity(struct net_device *dev, int inc);
2516 extern int dev_set_allmulti(struct net_device *dev, int inc);
2517 extern void netdev_state_change(struct net_device *dev);
2518 extern int netdev_bonding_change(struct net_device *dev,
2519 unsigned long event);
2520 extern void netdev_features_change(struct net_device *dev);
2521 /* Load a device via the kmod */
2522 extern void dev_load(struct net *net, const char *name);
2523 extern void dev_mcast_init(void);
2524 extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
2525 struct rtnl_link_stats64 *storage);
2527 extern int netdev_max_backlog;
2528 extern int netdev_tstamp_prequeue;
2529 extern int weight_p;
2530 extern int bpf_jit_enable;
2531 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
2532 extern int netdev_set_bond_master(struct net_device *dev,
2533 struct net_device *master);
2534 extern int skb_checksum_help(struct sk_buff *skb);
2535 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features);
2537 extern void netdev_rx_csum_fault(struct net_device *dev);
2539 static inline void netdev_rx_csum_fault(struct net_device *dev)
2543 /* rx skb timestamps */
2544 extern void net_enable_timestamp(void);
2545 extern void net_disable_timestamp(void);
2547 #ifdef CONFIG_PROC_FS
2548 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
2549 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
2550 extern void dev_seq_stop(struct seq_file *seq, void *v);
2553 extern int netdev_class_create_file(struct class_attribute *class_attr);
2554 extern void netdev_class_remove_file(struct class_attribute *class_attr);
2556 extern struct kobj_ns_type_operations net_ns_type_operations;
2558 extern const char *netdev_drivername(const struct net_device *dev);
2560 extern void linkwatch_run_queue(void);
2562 static inline u32 netdev_get_wanted_features(struct net_device *dev)
2564 return (dev->features & ~dev->hw_features) | dev->wanted_features;
2566 u32 netdev_increment_features(u32 all, u32 one, u32 mask);
2567 u32 netdev_fix_features(struct net_device *dev, u32 features);
2568 int __netdev_update_features(struct net_device *dev);
2569 void netdev_update_features(struct net_device *dev);
2570 void netdev_change_features(struct net_device *dev);
2572 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
2573 struct net_device *dev);
2575 u32 netif_skb_features(struct sk_buff *skb);
2577 static inline int net_gso_ok(u32 features, int gso_type)
2579 int feature = gso_type << NETIF_F_GSO_SHIFT;
2580 return (features & feature) == feature;
2583 static inline int skb_gso_ok(struct sk_buff *skb, u32 features)
2585 return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2586 (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2589 static inline int netif_needs_gso(struct sk_buff *skb, int features)
2591 return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2592 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2595 static inline void netif_set_gso_max_size(struct net_device *dev,
2598 dev->gso_max_size = size;
2601 static inline int netif_is_bond_slave(struct net_device *dev)
2603 return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
2606 extern struct pernet_operations __net_initdata loopback_net_ops;
2608 int dev_ethtool_get_settings(struct net_device *dev,
2609 struct ethtool_cmd *cmd);
2611 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
2613 if (dev->features & NETIF_F_RXCSUM)
2615 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
2617 return dev->ethtool_ops->get_rx_csum(dev);
2620 static inline u32 dev_ethtool_get_flags(struct net_device *dev)
2622 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
2624 return dev->ethtool_ops->get_flags(dev);
2627 /* Logging, debugging and troubleshooting/diagnostic helpers. */
2629 /* netdev_printk helpers, similar to dev_printk */
2631 static inline const char *netdev_name(const struct net_device *dev)
2633 if (dev->reg_state != NETREG_REGISTERED)
2634 return "(unregistered net_device)";
2638 extern int netdev_printk(const char *level, const struct net_device *dev,
2639 const char *format, ...)
2640 __attribute__ ((format (printf, 3, 4)));
2641 extern int netdev_emerg(const struct net_device *dev, const char *format, ...)
2642 __attribute__ ((format (printf, 2, 3)));
2643 extern int netdev_alert(const struct net_device *dev, const char *format, ...)
2644 __attribute__ ((format (printf, 2, 3)));
2645 extern int netdev_crit(const struct net_device *dev, const char *format, ...)
2646 __attribute__ ((format (printf, 2, 3)));
2647 extern int netdev_err(const struct net_device *dev, const char *format, ...)
2648 __attribute__ ((format (printf, 2, 3)));
2649 extern int netdev_warn(const struct net_device *dev, const char *format, ...)
2650 __attribute__ ((format (printf, 2, 3)));
2651 extern int netdev_notice(const struct net_device *dev, const char *format, ...)
2652 __attribute__ ((format (printf, 2, 3)));
2653 extern int netdev_info(const struct net_device *dev, const char *format, ...)
2654 __attribute__ ((format (printf, 2, 3)));
2656 #define MODULE_ALIAS_NETDEV(device) \
2657 MODULE_ALIAS("netdev-" device)
2660 #define netdev_dbg(__dev, format, args...) \
2661 netdev_printk(KERN_DEBUG, __dev, format, ##args)
2662 #elif defined(CONFIG_DYNAMIC_DEBUG)
2663 #define netdev_dbg(__dev, format, args...) \
2665 dynamic_dev_dbg((__dev)->dev.parent, "%s: " format, \
2666 netdev_name(__dev), ##args); \
2669 #define netdev_dbg(__dev, format, args...) \
2672 netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2677 #if defined(VERBOSE_DEBUG)
2678 #define netdev_vdbg netdev_dbg
2681 #define netdev_vdbg(dev, format, args...) \
2684 netdev_printk(KERN_DEBUG, dev, format, ##args); \
2690 * netdev_WARN() acts like dev_printk(), but with the key difference
2691 * of using a WARN/WARN_ON to get the message out, including the
2692 * file/line information and a backtrace.
2694 #define netdev_WARN(dev, format, args...) \
2695 WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2697 /* netif printk helpers, similar to netdev_printk */
2699 #define netif_printk(priv, type, level, dev, fmt, args...) \
2701 if (netif_msg_##type(priv)) \
2702 netdev_printk(level, (dev), fmt, ##args); \
2705 #define netif_level(level, priv, type, dev, fmt, args...) \
2707 if (netif_msg_##type(priv)) \
2708 netdev_##level(dev, fmt, ##args); \
2711 #define netif_emerg(priv, type, dev, fmt, args...) \
2712 netif_level(emerg, priv, type, dev, fmt, ##args)
2713 #define netif_alert(priv, type, dev, fmt, args...) \
2714 netif_level(alert, priv, type, dev, fmt, ##args)
2715 #define netif_crit(priv, type, dev, fmt, args...) \
2716 netif_level(crit, priv, type, dev, fmt, ##args)
2717 #define netif_err(priv, type, dev, fmt, args...) \
2718 netif_level(err, priv, type, dev, fmt, ##args)
2719 #define netif_warn(priv, type, dev, fmt, args...) \
2720 netif_level(warn, priv, type, dev, fmt, ##args)
2721 #define netif_notice(priv, type, dev, fmt, args...) \
2722 netif_level(notice, priv, type, dev, fmt, ##args)
2723 #define netif_info(priv, type, dev, fmt, args...) \
2724 netif_level(info, priv, type, dev, fmt, ##args)
2727 #define netif_dbg(priv, type, dev, format, args...) \
2728 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2729 #elif defined(CONFIG_DYNAMIC_DEBUG)
2730 #define netif_dbg(priv, type, netdev, format, args...) \
2732 if (netif_msg_##type(priv)) \
2733 dynamic_dev_dbg((netdev)->dev.parent, \
2735 netdev_name(netdev), ##args); \
2738 #define netif_dbg(priv, type, dev, format, args...) \
2741 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2746 #if defined(VERBOSE_DEBUG)
2747 #define netif_vdbg netif_dbg
2749 #define netif_vdbg(priv, type, dev, format, args...) \
2752 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2757 #endif /* __KERNEL__ */
2759 #endif /* _LINUX_NETDEVICE_H */