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.h>
35 #include <linux/timer.h>
36 #include <linux/delay.h>
37 #include <linux/atomic.h>
38 #include <asm/cache.h>
39 #include <asm/byteorder.h>
41 #include <linux/device.h>
42 #include <linux/percpu.h>
43 #include <linux/rculist.h>
44 #include <linux/dmaengine.h>
45 #include <linux/workqueue.h>
47 #include <linux/ethtool.h>
48 #include <net/net_namespace.h>
51 #include <net/dcbnl.h>
53 #include <net/netprio_cgroup.h>
55 #include <linux/netdev_features.h>
62 /* source back-compat hooks */
63 #define SET_ETHTOOL_OPS(netdev,ops) \
64 ( (netdev)->ethtool_ops = (ops) )
66 /* hardware address assignment types */
67 #define NET_ADDR_PERM 0 /* address is permanent (default) */
68 #define NET_ADDR_RANDOM 1 /* address is generated randomly */
69 #define NET_ADDR_STOLEN 2 /* address is stolen from other device */
71 /* Backlog congestion levels */
72 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
73 #define NET_RX_DROP 1 /* packet dropped */
76 * Transmit return codes: transmit return codes originate from three different
79 * - qdisc return codes
80 * - driver transmit return codes
83 * Drivers are allowed to return any one of those in their hard_start_xmit()
84 * function. Real network devices commonly used with qdiscs should only return
85 * the driver transmit return codes though - when qdiscs are used, the actual
86 * transmission happens asynchronously, so the value is not propagated to
87 * higher layers. Virtual network devices transmit synchronously, in this case
88 * the driver transmit return codes are consumed by dev_queue_xmit(), all
89 * others are propagated to higher layers.
92 /* qdisc ->enqueue() return codes. */
93 #define NET_XMIT_SUCCESS 0x00
94 #define NET_XMIT_DROP 0x01 /* skb dropped */
95 #define NET_XMIT_CN 0x02 /* congestion notification */
96 #define NET_XMIT_POLICED 0x03 /* skb is shot by police */
97 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */
99 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
100 * indicates that the device will soon be dropping packets, or already drops
101 * some packets of the same priority; prompting us to send less aggressively. */
102 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e))
103 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
105 /* Driver transmit return codes */
106 #define NETDEV_TX_MASK 0xf0
109 __NETDEV_TX_MIN
= INT_MIN
, /* make sure enum is signed */
110 NETDEV_TX_OK
= 0x00, /* driver took care of packet */
111 NETDEV_TX_BUSY
= 0x10, /* driver tx path was busy*/
112 NETDEV_TX_LOCKED
= 0x20, /* driver tx lock was already taken */
114 typedef enum netdev_tx netdev_tx_t
;
117 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
118 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
120 static inline bool dev_xmit_complete(int rc
)
123 * Positive cases with an skb consumed by a driver:
124 * - successful transmission (rc == NETDEV_TX_OK)
125 * - error while transmitting (rc < 0)
126 * - error while queueing to a different device (rc & NET_XMIT_MASK)
128 if (likely(rc
< NET_XMIT_MASK
))
136 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
138 /* Initial net device group. All devices belong to group 0 by default. */
139 #define INIT_NETDEV_GROUP 0
143 * Compute the worst case header length according to the protocols
147 #if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
148 # if defined(CONFIG_MAC80211_MESH)
149 # define LL_MAX_HEADER 128
151 # define LL_MAX_HEADER 96
153 #elif IS_ENABLED(CONFIG_TR)
154 # define LL_MAX_HEADER 48
156 # define LL_MAX_HEADER 32
159 #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
160 !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
161 #define MAX_HEADER LL_MAX_HEADER
163 #define MAX_HEADER (LL_MAX_HEADER + 48)
167 * Old network device statistics. Fields are native words
168 * (unsigned long) so they can be read and written atomically.
171 struct net_device_stats
{
172 unsigned long rx_packets
;
173 unsigned long tx_packets
;
174 unsigned long rx_bytes
;
175 unsigned long tx_bytes
;
176 unsigned long rx_errors
;
177 unsigned long tx_errors
;
178 unsigned long rx_dropped
;
179 unsigned long tx_dropped
;
180 unsigned long multicast
;
181 unsigned long collisions
;
182 unsigned long rx_length_errors
;
183 unsigned long rx_over_errors
;
184 unsigned long rx_crc_errors
;
185 unsigned long rx_frame_errors
;
186 unsigned long rx_fifo_errors
;
187 unsigned long rx_missed_errors
;
188 unsigned long tx_aborted_errors
;
189 unsigned long tx_carrier_errors
;
190 unsigned long tx_fifo_errors
;
191 unsigned long tx_heartbeat_errors
;
192 unsigned long tx_window_errors
;
193 unsigned long rx_compressed
;
194 unsigned long tx_compressed
;
197 #endif /* __KERNEL__ */
200 /* Media selection options. */
213 #include <linux/cache.h>
214 #include <linux/skbuff.h>
217 #include <linux/jump_label.h>
218 extern struct jump_label_key rps_needed
;
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)
265 /* cached hardware header; allow for machine alignment needs. */
266 #define HH_DATA_MOD 16
267 #define HH_DATA_OFF(__len) \
268 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
269 #define HH_DATA_ALIGN(__len) \
270 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
271 unsigned long hh_data
[HH_DATA_ALIGN(LL_MAX_HEADER
) / sizeof(long)];
274 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
276 * dev->hard_header_len ? (dev->hard_header_len +
277 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
279 * We could use other alignment values, but we must maintain the
280 * relationship HH alignment <= LL alignment.
282 #define LL_RESERVED_SPACE(dev) \
283 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
284 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
285 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
288 int (*create
) (struct sk_buff
*skb
, struct net_device
*dev
,
289 unsigned short type
, const void *daddr
,
290 const void *saddr
, unsigned len
);
291 int (*parse
)(const struct sk_buff
*skb
, unsigned char *haddr
);
292 int (*rebuild
)(struct sk_buff
*skb
);
293 int (*cache
)(const struct neighbour
*neigh
, struct hh_cache
*hh
, __be16 type
);
294 void (*cache_update
)(struct hh_cache
*hh
,
295 const struct net_device
*dev
,
296 const unsigned char *haddr
);
299 /* These flag bits are private to the generic network queueing
300 * layer, they may not be explicitly referenced by any other
304 enum netdev_state_t
{
306 __LINK_STATE_PRESENT
,
307 __LINK_STATE_NOCARRIER
,
308 __LINK_STATE_LINKWATCH_PENDING
,
309 __LINK_STATE_DORMANT
,
314 * This structure holds at boot time configured netdevice settings. They
315 * are then used in the device probing.
317 struct netdev_boot_setup
{
321 #define NETDEV_BOOT_SETUP_MAX 8
323 extern int __init
netdev_boot_setup(char *str
);
326 * Structure for NAPI scheduling similar to tasklet but with weighting
329 /* The poll_list must only be managed by the entity which
330 * changes the state of the NAPI_STATE_SCHED bit. This means
331 * whoever atomically sets that bit can add this napi_struct
332 * to the per-cpu poll_list, and whoever clears that bit
333 * can remove from the list right before clearing the bit.
335 struct list_head poll_list
;
339 int (*poll
)(struct napi_struct
*, int);
340 #ifdef CONFIG_NETPOLL
341 spinlock_t poll_lock
;
345 unsigned int gro_count
;
347 struct net_device
*dev
;
348 struct list_head dev_list
;
349 struct sk_buff
*gro_list
;
354 NAPI_STATE_SCHED
, /* Poll is scheduled */
355 NAPI_STATE_DISABLE
, /* Disable pending */
356 NAPI_STATE_NPSVC
, /* Netpoll - don't dequeue from poll_list */
366 typedef enum gro_result gro_result_t
;
369 * enum rx_handler_result - Possible return values for rx_handlers.
370 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
372 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
373 * case skb->dev was changed by rx_handler.
374 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
375 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
377 * rx_handlers are functions called from inside __netif_receive_skb(), to do
378 * special processing of the skb, prior to delivery to protocol handlers.
380 * Currently, a net_device can only have a single rx_handler registered. Trying
381 * to register a second rx_handler will return -EBUSY.
383 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
384 * To unregister a rx_handler on a net_device, use
385 * netdev_rx_handler_unregister().
387 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
390 * If the rx_handler consumed to skb in some way, it should return
391 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
392 * the skb to be delivered in some other ways.
394 * If the rx_handler changed skb->dev, to divert the skb to another
395 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
396 * new device will be called if it exists.
398 * If the rx_handler consider the skb should be ignored, it should return
399 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
400 * are registred on exact device (ptype->dev == skb->dev).
402 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
403 * delivered, it should return RX_HANDLER_PASS.
405 * A device without a registered rx_handler will behave as if rx_handler
406 * returned RX_HANDLER_PASS.
409 enum rx_handler_result
{
415 typedef enum rx_handler_result rx_handler_result_t
;
416 typedef rx_handler_result_t
rx_handler_func_t(struct sk_buff
**pskb
);
418 extern void __napi_schedule(struct napi_struct
*n
);
420 static inline int napi_disable_pending(struct napi_struct
*n
)
422 return test_bit(NAPI_STATE_DISABLE
, &n
->state
);
426 * napi_schedule_prep - check if napi can be scheduled
429 * Test if NAPI routine is already running, and if not mark
430 * it as running. This is used as a condition variable
431 * insure only one NAPI poll instance runs. We also make
432 * sure there is no pending NAPI disable.
434 static inline int napi_schedule_prep(struct napi_struct
*n
)
436 return !napi_disable_pending(n
) &&
437 !test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
);
441 * napi_schedule - schedule NAPI poll
444 * Schedule NAPI poll routine to be called if it is not already
447 static inline void napi_schedule(struct napi_struct
*n
)
449 if (napi_schedule_prep(n
))
453 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
454 static inline int napi_reschedule(struct napi_struct
*napi
)
456 if (napi_schedule_prep(napi
)) {
457 __napi_schedule(napi
);
464 * napi_complete - NAPI processing complete
467 * Mark NAPI processing as complete.
469 extern void __napi_complete(struct napi_struct
*n
);
470 extern void napi_complete(struct napi_struct
*n
);
473 * napi_disable - prevent NAPI from scheduling
476 * Stop NAPI from being scheduled on this context.
477 * Waits till any outstanding processing completes.
479 static inline void napi_disable(struct napi_struct
*n
)
481 set_bit(NAPI_STATE_DISABLE
, &n
->state
);
482 while (test_and_set_bit(NAPI_STATE_SCHED
, &n
->state
))
484 clear_bit(NAPI_STATE_DISABLE
, &n
->state
);
488 * napi_enable - enable NAPI scheduling
491 * Resume NAPI from being scheduled on this context.
492 * Must be paired with napi_disable.
494 static inline void napi_enable(struct napi_struct
*n
)
496 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
497 smp_mb__before_clear_bit();
498 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
503 * napi_synchronize - wait until NAPI is not running
506 * Wait until NAPI is done being scheduled on this context.
507 * Waits till any outstanding processing completes but
508 * does not disable future activations.
510 static inline void napi_synchronize(const struct napi_struct
*n
)
512 while (test_bit(NAPI_STATE_SCHED
, &n
->state
))
516 # define napi_synchronize(n) barrier()
519 enum netdev_queue_state_t
{
521 __QUEUE_STATE_FROZEN
,
522 #define QUEUE_STATE_XOFF_OR_FROZEN ((1 << __QUEUE_STATE_XOFF) | \
523 (1 << __QUEUE_STATE_FROZEN))
526 struct netdev_queue
{
530 struct net_device
*dev
;
533 struct Qdisc
*qdisc_sleeping
;
537 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
543 spinlock_t _xmit_lock ____cacheline_aligned_in_smp
;
546 * please use this field instead of dev->trans_start
548 unsigned long trans_start
;
551 * Number of TX timeouts for this queue
552 * (/sys/class/net/DEV/Q/trans_timeout)
554 unsigned long trans_timeout
;
555 } ____cacheline_aligned_in_smp
;
557 static inline int netdev_queue_numa_node_read(const struct netdev_queue
*q
)
559 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
566 static inline void netdev_queue_numa_node_write(struct netdev_queue
*q
, int node
)
568 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
575 * This structure holds an RPS map which can be of variable length. The
576 * map is an array of CPUs.
583 #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))
586 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
587 * tail pointer for that CPU's input queue at the time of last enqueue, and
588 * a hardware filter index.
590 struct rps_dev_flow
{
593 unsigned int last_qtail
;
595 #define RPS_NO_FILTER 0xffff
598 * The rps_dev_flow_table structure contains a table of flow mappings.
600 struct rps_dev_flow_table
{
603 struct work_struct free_work
;
604 struct rps_dev_flow flows
[0];
606 #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
607 (_num * sizeof(struct rps_dev_flow)))
610 * The rps_sock_flow_table contains mappings of flows to the last CPU
611 * on which they were processed by the application (set in recvmsg).
613 struct rps_sock_flow_table
{
617 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
618 (_num * sizeof(u16)))
620 #define RPS_NO_CPU 0xffff
622 static inline void rps_record_sock_flow(struct rps_sock_flow_table
*table
,
626 unsigned int cpu
, index
= hash
& table
->mask
;
628 /* We only give a hint, preemption can change cpu under us */
629 cpu
= raw_smp_processor_id();
631 if (table
->ents
[index
] != cpu
)
632 table
->ents
[index
] = cpu
;
636 static inline void rps_reset_sock_flow(struct rps_sock_flow_table
*table
,
640 table
->ents
[hash
& table
->mask
] = RPS_NO_CPU
;
643 extern struct rps_sock_flow_table __rcu
*rps_sock_flow_table
;
645 #ifdef CONFIG_RFS_ACCEL
646 extern bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
647 u32 flow_id
, u16 filter_id
);
650 /* This structure contains an instance of an RX queue. */
651 struct netdev_rx_queue
{
652 struct rps_map __rcu
*rps_map
;
653 struct rps_dev_flow_table __rcu
*rps_flow_table
;
655 struct net_device
*dev
;
656 } ____cacheline_aligned_in_smp
;
657 #endif /* CONFIG_RPS */
661 * This structure holds an XPS map which can be of variable length. The
662 * map is an array of queues.
666 unsigned int alloc_len
;
670 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + (_num * sizeof(u16)))
671 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map)) \
675 * This structure holds all XPS maps for device. Maps are indexed by CPU.
677 struct xps_dev_maps
{
679 struct xps_map __rcu
*cpu_map
[0];
681 #define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) + \
682 (nr_cpu_ids * sizeof(struct xps_map *)))
683 #endif /* CONFIG_XPS */
685 #define TC_MAX_QUEUE 16
686 #define TC_BITMASK 15
687 /* HW offloaded queuing disciplines txq count and offset maps */
688 struct netdev_tc_txq
{
694 * This structure defines the management hooks for network devices.
695 * The following hooks can be defined; unless noted otherwise, they are
696 * optional and can be filled with a null pointer.
698 * int (*ndo_init)(struct net_device *dev);
699 * This function is called once when network device is registered.
700 * The network device can use this to any late stage initializaton
701 * or semantic validattion. It can fail with an error code which will
702 * be propogated back to register_netdev
704 * void (*ndo_uninit)(struct net_device *dev);
705 * This function is called when device is unregistered or when registration
706 * fails. It is not called if init fails.
708 * int (*ndo_open)(struct net_device *dev);
709 * This function is called when network device transistions to the up
712 * int (*ndo_stop)(struct net_device *dev);
713 * This function is called when network device transistions to the down
716 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
717 * struct net_device *dev);
718 * Called when a packet needs to be transmitted.
719 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
720 * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
721 * Required can not be NULL.
723 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
724 * Called to decide which queue to when device supports multiple
727 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
728 * This function is called to allow device receiver to make
729 * changes to configuration when multicast or promiscious is enabled.
731 * void (*ndo_set_rx_mode)(struct net_device *dev);
732 * This function is called device changes address list filtering.
733 * If driver handles unicast address filtering, it should set
734 * IFF_UNICAST_FLT to its priv_flags.
736 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
737 * This function is called when the Media Access Control address
738 * needs to be changed. If this interface is not defined, the
739 * mac address can not be changed.
741 * int (*ndo_validate_addr)(struct net_device *dev);
742 * Test if Media Access Control address is valid for the device.
744 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
745 * Called when a user request an ioctl which can't be handled by
746 * the generic interface code. If not defined ioctl's return
747 * not supported error code.
749 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
750 * Used to set network devices bus interface parameters. This interface
751 * is retained for legacy reason, new devices should use the bus
752 * interface (PCI) for low level management.
754 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
755 * Called when a user wants to change the Maximum Transfer Unit
756 * of a device. If not defined, any request to change MTU will
757 * will return an error.
759 * void (*ndo_tx_timeout)(struct net_device *dev);
760 * Callback uses when the transmitter has not made any progress
761 * for dev->watchdog ticks.
763 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
764 * struct rtnl_link_stats64 *storage);
765 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
766 * Called when a user wants to get the network device usage
767 * statistics. Drivers must do one of the following:
768 * 1. Define @ndo_get_stats64 to fill in a zero-initialised
769 * rtnl_link_stats64 structure passed by the caller.
770 * 2. Define @ndo_get_stats to update a net_device_stats structure
771 * (which should normally be dev->stats) and return a pointer to
772 * it. The structure may be changed asynchronously only if each
773 * field is written atomically.
774 * 3. Update dev->stats asynchronously and atomically, and define
777 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
778 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
779 * this function is called when a VLAN id is registered.
781 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
782 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
783 * this function is called when a VLAN id is unregistered.
785 * void (*ndo_poll_controller)(struct net_device *dev);
787 * SR-IOV management functions.
788 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
789 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
790 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
791 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
792 * int (*ndo_get_vf_config)(struct net_device *dev,
793 * int vf, struct ifla_vf_info *ivf);
794 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
795 * struct nlattr *port[]);
796 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
797 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
798 * Called to setup 'tc' number of traffic classes in the net device. This
799 * is always called from the stack with the rtnl lock held and netif tx
800 * queues stopped. This allows the netdevice to perform queue management
803 * Fiber Channel over Ethernet (FCoE) offload functions.
804 * int (*ndo_fcoe_enable)(struct net_device *dev);
805 * Called when the FCoE protocol stack wants to start using LLD for FCoE
806 * so the underlying device can perform whatever needed configuration or
807 * initialization to support acceleration of FCoE traffic.
809 * int (*ndo_fcoe_disable)(struct net_device *dev);
810 * Called when the FCoE protocol stack wants to stop using LLD for FCoE
811 * so the underlying device can perform whatever needed clean-ups to
812 * stop supporting acceleration of FCoE traffic.
814 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
815 * struct scatterlist *sgl, unsigned int sgc);
816 * Called when the FCoE Initiator wants to initialize an I/O that
817 * is a possible candidate for Direct Data Placement (DDP). The LLD can
818 * perform necessary setup and returns 1 to indicate the device is set up
819 * successfully to perform DDP on this I/O, otherwise this returns 0.
821 * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid);
822 * Called when the FCoE Initiator/Target is done with the DDPed I/O as
823 * indicated by the FC exchange id 'xid', so the underlying device can
824 * clean up and reuse resources for later DDP requests.
826 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
827 * struct scatterlist *sgl, unsigned int sgc);
828 * Called when the FCoE Target wants to initialize an I/O that
829 * is a possible candidate for Direct Data Placement (DDP). The LLD can
830 * perform necessary setup and returns 1 to indicate the device is set up
831 * successfully to perform DDP on this I/O, otherwise this returns 0.
833 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
834 * Called when the underlying device wants to override default World Wide
835 * Name (WWN) generation mechanism in FCoE protocol stack to pass its own
836 * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
837 * protocol stack to use.
840 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
841 * u16 rxq_index, u32 flow_id);
842 * Set hardware filter for RFS. rxq_index is the target queue index;
843 * flow_id is a flow ID to be passed to rps_may_expire_flow() later.
844 * Return the filter ID on success, or a negative error code.
846 * Slave management functions (for bridge, bonding, etc). User should
847 * call netdev_set_master() to set dev->master properly.
848 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
849 * Called to make another netdev an underling.
851 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
852 * Called to release previously enslaved netdev.
854 * Feature/offload setting functions.
855 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
856 * netdev_features_t features);
857 * Adjusts the requested feature flags according to device-specific
858 * constraints, and returns the resulting flags. Must not modify
861 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
862 * Called to update device configuration to new features. Passed
863 * feature set might be less than what was returned by ndo_fix_features()).
864 * Must return >0 or -errno if it changed dev->features itself.
867 struct net_device_ops
{
868 int (*ndo_init
)(struct net_device
*dev
);
869 void (*ndo_uninit
)(struct net_device
*dev
);
870 int (*ndo_open
)(struct net_device
*dev
);
871 int (*ndo_stop
)(struct net_device
*dev
);
872 netdev_tx_t (*ndo_start_xmit
) (struct sk_buff
*skb
,
873 struct net_device
*dev
);
874 u16 (*ndo_select_queue
)(struct net_device
*dev
,
875 struct sk_buff
*skb
);
876 void (*ndo_change_rx_flags
)(struct net_device
*dev
,
878 void (*ndo_set_rx_mode
)(struct net_device
*dev
);
879 int (*ndo_set_mac_address
)(struct net_device
*dev
,
881 int (*ndo_validate_addr
)(struct net_device
*dev
);
882 int (*ndo_do_ioctl
)(struct net_device
*dev
,
883 struct ifreq
*ifr
, int cmd
);
884 int (*ndo_set_config
)(struct net_device
*dev
,
886 int (*ndo_change_mtu
)(struct net_device
*dev
,
888 int (*ndo_neigh_setup
)(struct net_device
*dev
,
889 struct neigh_parms
*);
890 void (*ndo_tx_timeout
) (struct net_device
*dev
);
892 struct rtnl_link_stats64
* (*ndo_get_stats64
)(struct net_device
*dev
,
893 struct rtnl_link_stats64
*storage
);
894 struct net_device_stats
* (*ndo_get_stats
)(struct net_device
*dev
);
896 void (*ndo_vlan_rx_add_vid
)(struct net_device
*dev
,
898 void (*ndo_vlan_rx_kill_vid
)(struct net_device
*dev
,
900 #ifdef CONFIG_NET_POLL_CONTROLLER
901 void (*ndo_poll_controller
)(struct net_device
*dev
);
902 int (*ndo_netpoll_setup
)(struct net_device
*dev
,
903 struct netpoll_info
*info
);
904 void (*ndo_netpoll_cleanup
)(struct net_device
*dev
);
906 int (*ndo_set_vf_mac
)(struct net_device
*dev
,
908 int (*ndo_set_vf_vlan
)(struct net_device
*dev
,
909 int queue
, u16 vlan
, u8 qos
);
910 int (*ndo_set_vf_tx_rate
)(struct net_device
*dev
,
912 int (*ndo_set_vf_spoofchk
)(struct net_device
*dev
,
913 int vf
, bool setting
);
914 int (*ndo_get_vf_config
)(struct net_device
*dev
,
916 struct ifla_vf_info
*ivf
);
917 int (*ndo_set_vf_port
)(struct net_device
*dev
,
919 struct nlattr
*port
[]);
920 int (*ndo_get_vf_port
)(struct net_device
*dev
,
921 int vf
, struct sk_buff
*skb
);
922 int (*ndo_setup_tc
)(struct net_device
*dev
, u8 tc
);
923 #if IS_ENABLED(CONFIG_FCOE)
924 int (*ndo_fcoe_enable
)(struct net_device
*dev
);
925 int (*ndo_fcoe_disable
)(struct net_device
*dev
);
926 int (*ndo_fcoe_ddp_setup
)(struct net_device
*dev
,
928 struct scatterlist
*sgl
,
930 int (*ndo_fcoe_ddp_done
)(struct net_device
*dev
,
932 int (*ndo_fcoe_ddp_target
)(struct net_device
*dev
,
934 struct scatterlist
*sgl
,
938 #if IS_ENABLED(CONFIG_LIBFCOE)
939 #define NETDEV_FCOE_WWNN 0
940 #define NETDEV_FCOE_WWPN 1
941 int (*ndo_fcoe_get_wwn
)(struct net_device
*dev
,
945 #ifdef CONFIG_RFS_ACCEL
946 int (*ndo_rx_flow_steer
)(struct net_device
*dev
,
947 const struct sk_buff
*skb
,
951 int (*ndo_add_slave
)(struct net_device
*dev
,
952 struct net_device
*slave_dev
);
953 int (*ndo_del_slave
)(struct net_device
*dev
,
954 struct net_device
*slave_dev
);
955 netdev_features_t (*ndo_fix_features
)(struct net_device
*dev
,
956 netdev_features_t features
);
957 int (*ndo_set_features
)(struct net_device
*dev
,
958 netdev_features_t features
);
962 * The DEVICE structure.
963 * Actually, this whole structure is a big mistake. It mixes I/O
964 * data with strictly "high-level" data, and it has to know about
965 * almost every data structure used in the INET module.
967 * FIXME: cleanup struct net_device such that network protocol info
974 * This is the first field of the "visible" part of this structure
975 * (i.e. as seen by users in the "Space.c" file). It is the name
980 struct pm_qos_request pm_qos_req
;
982 /* device name hash chain */
983 struct hlist_node name_hlist
;
988 * I/O specific fields
989 * FIXME: Merge these and struct ifmap into one
991 unsigned long mem_end
; /* shared mem end */
992 unsigned long mem_start
; /* shared mem start */
993 unsigned long base_addr
; /* device I/O address */
994 unsigned int irq
; /* device IRQ number */
997 * Some hardware also needs these fields, but they are not
998 * part of the usual set specified in Space.c.
1001 unsigned long state
;
1003 struct list_head dev_list
;
1004 struct list_head napi_list
;
1005 struct list_head unreg_list
;
1007 /* currently active device features */
1008 netdev_features_t features
;
1009 /* user-changeable features */
1010 netdev_features_t hw_features
;
1011 /* user-requested features */
1012 netdev_features_t wanted_features
;
1013 /* mask of features inheritable by VLAN devices */
1014 netdev_features_t vlan_features
;
1016 /* Interface index. Unique device identifier */
1020 struct net_device_stats stats
;
1021 atomic_long_t rx_dropped
; /* dropped packets by core network
1022 * Do not use this in drivers.
1025 #ifdef CONFIG_WIRELESS_EXT
1026 /* List of functions to handle Wireless Extensions (instead of ioctl).
1027 * See <net/iw_handler.h> for details. Jean II */
1028 const struct iw_handler_def
* wireless_handlers
;
1029 /* Instance data managed by the core of Wireless Extensions. */
1030 struct iw_public_data
* wireless_data
;
1032 /* Management operations */
1033 const struct net_device_ops
*netdev_ops
;
1034 const struct ethtool_ops
*ethtool_ops
;
1036 /* Hardware header description */
1037 const struct header_ops
*header_ops
;
1039 unsigned int flags
; /* interface flags (a la BSD) */
1040 unsigned int priv_flags
; /* Like 'flags' but invisible to userspace. */
1041 unsigned short gflags
;
1042 unsigned short padded
; /* How much padding added by alloc_netdev() */
1044 unsigned char operstate
; /* RFC2863 operstate */
1045 unsigned char link_mode
; /* mapping policy to operstate */
1047 unsigned char if_port
; /* Selectable AUI, TP,..*/
1048 unsigned char dma
; /* DMA channel */
1050 unsigned int mtu
; /* interface MTU value */
1051 unsigned short type
; /* interface hardware type */
1052 unsigned short hard_header_len
; /* hardware hdr length */
1054 /* extra head- and tailroom the hardware may need, but not in all cases
1055 * can this be guaranteed, especially tailroom. Some cases also use
1056 * LL_MAX_HEADER instead to allocate the skb.
1058 unsigned short needed_headroom
;
1059 unsigned short needed_tailroom
;
1061 /* Interface address info. */
1062 unsigned char perm_addr
[MAX_ADDR_LEN
]; /* permanent hw address */
1063 unsigned char addr_assign_type
; /* hw address assignment type */
1064 unsigned char addr_len
; /* hardware address length */
1065 unsigned short dev_id
; /* for shared network cards */
1067 spinlock_t addr_list_lock
;
1068 struct netdev_hw_addr_list uc
; /* Unicast mac addresses */
1069 struct netdev_hw_addr_list mc
; /* Multicast mac addresses */
1071 unsigned int promiscuity
;
1072 unsigned int allmulti
;
1075 /* Protocol specific pointers */
1077 #if IS_ENABLED(CONFIG_VLAN_8021Q)
1078 struct vlan_group __rcu
*vlgrp
; /* VLAN group */
1080 #if IS_ENABLED(CONFIG_NET_DSA)
1081 struct dsa_switch_tree
*dsa_ptr
; /* dsa specific data */
1083 void *atalk_ptr
; /* AppleTalk link */
1084 struct in_device __rcu
*ip_ptr
; /* IPv4 specific data */
1085 struct dn_dev __rcu
*dn_ptr
; /* DECnet specific data */
1086 struct inet6_dev __rcu
*ip6_ptr
; /* IPv6 specific data */
1087 void *ec_ptr
; /* Econet specific data */
1088 void *ax25_ptr
; /* AX.25 specific data */
1089 struct wireless_dev
*ieee80211_ptr
; /* IEEE 802.11 specific data,
1090 assign before registering */
1093 * Cache lines mostly used on receive path (including eth_type_trans())
1095 unsigned long last_rx
; /* Time of last Rx
1096 * This should not be set in
1097 * drivers, unless really needed,
1098 * because network stack (bonding)
1099 * use it if/when necessary, to
1100 * avoid dirtying this cache line.
1103 struct net_device
*master
; /* Pointer to master device of a group,
1104 * which this device is member of.
1107 /* Interface address info used in eth_type_trans() */
1108 unsigned char *dev_addr
; /* hw address, (before bcast
1109 because most packets are
1112 struct netdev_hw_addr_list dev_addrs
; /* list of device
1115 unsigned char broadcast
[MAX_ADDR_LEN
]; /* hw bcast add */
1118 struct kset
*queues_kset
;
1122 struct netdev_rx_queue
*_rx
;
1124 /* Number of RX queues allocated at register_netdev() time */
1125 unsigned int num_rx_queues
;
1127 /* Number of RX queues currently active in device */
1128 unsigned int real_num_rx_queues
;
1130 #ifdef CONFIG_RFS_ACCEL
1131 /* CPU reverse-mapping for RX completion interrupts, indexed
1132 * by RX queue number. Assigned by driver. This must only be
1133 * set if the ndo_rx_flow_steer operation is defined. */
1134 struct cpu_rmap
*rx_cpu_rmap
;
1138 rx_handler_func_t __rcu
*rx_handler
;
1139 void __rcu
*rx_handler_data
;
1141 struct netdev_queue __rcu
*ingress_queue
;
1144 * Cache lines mostly used on transmit path
1146 struct netdev_queue
*_tx ____cacheline_aligned_in_smp
;
1148 /* Number of TX queues allocated at alloc_netdev_mq() time */
1149 unsigned int num_tx_queues
;
1151 /* Number of TX queues currently active in device */
1152 unsigned int real_num_tx_queues
;
1154 /* root qdisc from userspace point of view */
1155 struct Qdisc
*qdisc
;
1157 unsigned long tx_queue_len
; /* Max frames per queue allowed */
1158 spinlock_t tx_global_lock
;
1161 struct xps_dev_maps __rcu
*xps_maps
;
1164 /* These may be needed for future network-power-down code. */
1167 * trans_start here is expensive for high speed devices on SMP,
1168 * please use netdev_queue->trans_start instead.
1170 unsigned long trans_start
; /* Time (in jiffies) of last Tx */
1172 int watchdog_timeo
; /* used by dev_watchdog() */
1173 struct timer_list watchdog_timer
;
1175 /* Number of references to this device */
1176 int __percpu
*pcpu_refcnt
;
1178 /* delayed register/unregister */
1179 struct list_head todo_list
;
1180 /* device index hash chain */
1181 struct hlist_node index_hlist
;
1183 struct list_head link_watch_list
;
1185 /* register/unregister state machine */
1186 enum { NETREG_UNINITIALIZED
=0,
1187 NETREG_REGISTERED
, /* completed register_netdevice */
1188 NETREG_UNREGISTERING
, /* called unregister_netdevice */
1189 NETREG_UNREGISTERED
, /* completed unregister todo */
1190 NETREG_RELEASED
, /* called free_netdev */
1191 NETREG_DUMMY
, /* dummy device for NAPI poll */
1194 bool dismantle
; /* device is going do be freed */
1197 RTNL_LINK_INITIALIZED
,
1198 RTNL_LINK_INITIALIZING
,
1199 } rtnl_link_state
:16;
1201 /* Called from unregister, can be used to call free_netdev */
1202 void (*destructor
)(struct net_device
*dev
);
1204 #ifdef CONFIG_NETPOLL
1205 struct netpoll_info
*npinfo
;
1208 #ifdef CONFIG_NET_NS
1209 /* Network namespace this network device is inside */
1213 /* mid-layer private */
1216 struct pcpu_lstats __percpu
*lstats
; /* loopback stats */
1217 struct pcpu_tstats __percpu
*tstats
; /* tunnel stats */
1218 struct pcpu_dstats __percpu
*dstats
; /* dummy stats */
1221 struct garp_port __rcu
*garp_port
;
1223 /* class/net/name entry */
1225 /* space for optional device, statistics, and wireless sysfs groups */
1226 const struct attribute_group
*sysfs_groups
[4];
1228 /* rtnetlink link ops */
1229 const struct rtnl_link_ops
*rtnl_link_ops
;
1231 /* for setting kernel sock attribute on TCP connection setup */
1232 #define GSO_MAX_SIZE 65536
1233 unsigned int gso_max_size
;
1236 /* Data Center Bridging netlink ops */
1237 const struct dcbnl_rtnl_ops
*dcbnl_ops
;
1240 struct netdev_tc_txq tc_to_txq
[TC_MAX_QUEUE
];
1241 u8 prio_tc_map
[TC_BITMASK
+ 1];
1243 #if IS_ENABLED(CONFIG_FCOE)
1244 /* max exchange id for FCoE LRO by ddp */
1245 unsigned int fcoe_ddp_xid
;
1247 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
1248 struct netprio_map __rcu
*priomap
;
1250 /* phy device may attach itself for hardware timestamping */
1251 struct phy_device
*phydev
;
1253 /* group the device belongs to */
1256 #define to_net_dev(d) container_of(d, struct net_device, dev)
1258 #define NETDEV_ALIGN 32
1261 int netdev_get_prio_tc_map(const struct net_device
*dev
, u32 prio
)
1263 return dev
->prio_tc_map
[prio
& TC_BITMASK
];
1267 int netdev_set_prio_tc_map(struct net_device
*dev
, u8 prio
, u8 tc
)
1269 if (tc
>= dev
->num_tc
)
1272 dev
->prio_tc_map
[prio
& TC_BITMASK
] = tc
& TC_BITMASK
;
1277 void netdev_reset_tc(struct net_device
*dev
)
1280 memset(dev
->tc_to_txq
, 0, sizeof(dev
->tc_to_txq
));
1281 memset(dev
->prio_tc_map
, 0, sizeof(dev
->prio_tc_map
));
1285 int netdev_set_tc_queue(struct net_device
*dev
, u8 tc
, u16 count
, u16 offset
)
1287 if (tc
>= dev
->num_tc
)
1290 dev
->tc_to_txq
[tc
].count
= count
;
1291 dev
->tc_to_txq
[tc
].offset
= offset
;
1296 int netdev_set_num_tc(struct net_device
*dev
, u8 num_tc
)
1298 if (num_tc
> TC_MAX_QUEUE
)
1301 dev
->num_tc
= num_tc
;
1306 int netdev_get_num_tc(struct net_device
*dev
)
1312 struct netdev_queue
*netdev_get_tx_queue(const struct net_device
*dev
,
1315 return &dev
->_tx
[index
];
1318 static inline void netdev_for_each_tx_queue(struct net_device
*dev
,
1319 void (*f
)(struct net_device
*,
1320 struct netdev_queue
*,
1326 for (i
= 0; i
< dev
->num_tx_queues
; i
++)
1327 f(dev
, &dev
->_tx
[i
], arg
);
1331 * Net namespace inlines
1334 struct net
*dev_net(const struct net_device
*dev
)
1336 return read_pnet(&dev
->nd_net
);
1340 void dev_net_set(struct net_device
*dev
, struct net
*net
)
1342 #ifdef CONFIG_NET_NS
1343 release_net(dev
->nd_net
);
1344 dev
->nd_net
= hold_net(net
);
1348 static inline bool netdev_uses_dsa_tags(struct net_device
*dev
)
1350 #ifdef CONFIG_NET_DSA_TAG_DSA
1351 if (dev
->dsa_ptr
!= NULL
)
1352 return dsa_uses_dsa_tags(dev
->dsa_ptr
);
1358 #ifndef CONFIG_NET_NS
1359 static inline void skb_set_dev(struct sk_buff
*skb
, struct net_device
*dev
)
1363 #else /* CONFIG_NET_NS */
1364 void skb_set_dev(struct sk_buff
*skb
, struct net_device
*dev
);
1367 static inline bool netdev_uses_trailer_tags(struct net_device
*dev
)
1369 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1370 if (dev
->dsa_ptr
!= NULL
)
1371 return dsa_uses_trailer_tags(dev
->dsa_ptr
);
1378 * netdev_priv - access network device private data
1379 * @dev: network device
1381 * Get network device private data
1383 static inline void *netdev_priv(const struct net_device
*dev
)
1385 return (char *)dev
+ ALIGN(sizeof(struct net_device
), NETDEV_ALIGN
);
1388 /* Set the sysfs physical device reference for the network logical device
1389 * if set prior to registration will cause a symlink during initialization.
1391 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
1393 /* Set the sysfs device type for the network logical device to allow
1394 * fin grained indentification of different network device types. For
1395 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1397 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype))
1400 * netif_napi_add - initialize a napi context
1401 * @dev: network device
1402 * @napi: napi context
1403 * @poll: polling function
1404 * @weight: default weight
1406 * netif_napi_add() must be used to initialize a napi context prior to calling
1407 * *any* of the other napi related functions.
1409 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
1410 int (*poll
)(struct napi_struct
*, int), int weight
);
1413 * netif_napi_del - remove a napi context
1414 * @napi: napi context
1416 * netif_napi_del() removes a napi context from the network device napi list
1418 void netif_napi_del(struct napi_struct
*napi
);
1420 struct napi_gro_cb
{
1421 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1424 /* Length of frag0. */
1425 unsigned int frag0_len
;
1427 /* This indicates where we are processing relative to skb->data. */
1430 /* This is non-zero if the packet may be of the same flow. */
1433 /* This is non-zero if the packet cannot be merged with the new skb. */
1436 /* Number of segments aggregated. */
1443 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1445 struct packet_type
{
1446 __be16 type
; /* This is really htons(ether_type). */
1447 struct net_device
*dev
; /* NULL is wildcarded here */
1448 int (*func
) (struct sk_buff
*,
1449 struct net_device
*,
1450 struct packet_type
*,
1451 struct net_device
*);
1452 struct sk_buff
*(*gso_segment
)(struct sk_buff
*skb
,
1453 netdev_features_t features
);
1454 int (*gso_send_check
)(struct sk_buff
*skb
);
1455 struct sk_buff
**(*gro_receive
)(struct sk_buff
**head
,
1456 struct sk_buff
*skb
);
1457 int (*gro_complete
)(struct sk_buff
*skb
);
1458 void *af_packet_priv
;
1459 struct list_head list
;
1462 #include <linux/notifier.h>
1464 /* netdevice notifier chain. Please remember to update the rtnetlink
1465 * notification exclusion list in rtnetlink_event() when adding new
1468 #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */
1469 #define NETDEV_DOWN 0x0002
1470 #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface
1471 detected a hardware crash and restarted
1472 - we can use this eg to kick tcp sessions
1474 #define NETDEV_CHANGE 0x0004 /* Notify device state change */
1475 #define NETDEV_REGISTER 0x0005
1476 #define NETDEV_UNREGISTER 0x0006
1477 #define NETDEV_CHANGEMTU 0x0007
1478 #define NETDEV_CHANGEADDR 0x0008
1479 #define NETDEV_GOING_DOWN 0x0009
1480 #define NETDEV_CHANGENAME 0x000A
1481 #define NETDEV_FEAT_CHANGE 0x000B
1482 #define NETDEV_BONDING_FAILOVER 0x000C
1483 #define NETDEV_PRE_UP 0x000D
1484 #define NETDEV_PRE_TYPE_CHANGE 0x000E
1485 #define NETDEV_POST_TYPE_CHANGE 0x000F
1486 #define NETDEV_POST_INIT 0x0010
1487 #define NETDEV_UNREGISTER_BATCH 0x0011
1488 #define NETDEV_RELEASE 0x0012
1489 #define NETDEV_NOTIFY_PEERS 0x0013
1490 #define NETDEV_JOIN 0x0014
1492 extern int register_netdevice_notifier(struct notifier_block
*nb
);
1493 extern int unregister_netdevice_notifier(struct notifier_block
*nb
);
1494 extern int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
);
1497 extern rwlock_t dev_base_lock
; /* Device list lock */
1500 #define for_each_netdev(net, d) \
1501 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1502 #define for_each_netdev_reverse(net, d) \
1503 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1504 #define for_each_netdev_rcu(net, d) \
1505 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1506 #define for_each_netdev_safe(net, d, n) \
1507 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1508 #define for_each_netdev_continue(net, d) \
1509 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1510 #define for_each_netdev_continue_rcu(net, d) \
1511 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1512 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
1514 static inline struct net_device
*next_net_device(struct net_device
*dev
)
1516 struct list_head
*lh
;
1520 lh
= dev
->dev_list
.next
;
1521 return lh
== &net
->dev_base_head
? NULL
: net_device_entry(lh
);
1524 static inline struct net_device
*next_net_device_rcu(struct net_device
*dev
)
1526 struct list_head
*lh
;
1530 lh
= rcu_dereference(list_next_rcu(&dev
->dev_list
));
1531 return lh
== &net
->dev_base_head
? NULL
: net_device_entry(lh
);
1534 static inline struct net_device
*first_net_device(struct net
*net
)
1536 return list_empty(&net
->dev_base_head
) ? NULL
:
1537 net_device_entry(net
->dev_base_head
.next
);
1540 static inline struct net_device
*first_net_device_rcu(struct net
*net
)
1542 struct list_head
*lh
= rcu_dereference(list_next_rcu(&net
->dev_base_head
));
1544 return lh
== &net
->dev_base_head
? NULL
: net_device_entry(lh
);
1547 extern int netdev_boot_setup_check(struct net_device
*dev
);
1548 extern unsigned long netdev_boot_base(const char *prefix
, int unit
);
1549 extern struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
1550 const char *hwaddr
);
1551 extern struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
);
1552 extern struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
);
1553 extern void dev_add_pack(struct packet_type
*pt
);
1554 extern void dev_remove_pack(struct packet_type
*pt
);
1555 extern void __dev_remove_pack(struct packet_type
*pt
);
1557 extern struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short flags
,
1558 unsigned short mask
);
1559 extern struct net_device
*dev_get_by_name(struct net
*net
, const char *name
);
1560 extern struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
);
1561 extern struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
);
1562 extern int dev_alloc_name(struct net_device
*dev
, const char *name
);
1563 extern int dev_open(struct net_device
*dev
);
1564 extern int dev_close(struct net_device
*dev
);
1565 extern void dev_disable_lro(struct net_device
*dev
);
1566 extern int dev_queue_xmit(struct sk_buff
*skb
);
1567 extern int register_netdevice(struct net_device
*dev
);
1568 extern void unregister_netdevice_queue(struct net_device
*dev
,
1569 struct list_head
*head
);
1570 extern void unregister_netdevice_many(struct list_head
*head
);
1571 static inline void unregister_netdevice(struct net_device
*dev
)
1573 unregister_netdevice_queue(dev
, NULL
);
1576 extern int netdev_refcnt_read(const struct net_device
*dev
);
1577 extern void free_netdev(struct net_device
*dev
);
1578 extern void synchronize_net(void);
1579 extern int init_dummy_netdev(struct net_device
*dev
);
1580 extern void netdev_resync_ops(struct net_device
*dev
);
1582 extern struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
);
1583 extern struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
);
1584 extern struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
);
1585 extern int dev_restart(struct net_device
*dev
);
1586 #ifdef CONFIG_NETPOLL_TRAP
1587 extern int netpoll_trap(void);
1589 extern int skb_gro_receive(struct sk_buff
**head
,
1590 struct sk_buff
*skb
);
1591 extern void skb_gro_reset_offset(struct sk_buff
*skb
);
1593 static inline unsigned int skb_gro_offset(const struct sk_buff
*skb
)
1595 return NAPI_GRO_CB(skb
)->data_offset
;
1598 static inline unsigned int skb_gro_len(const struct sk_buff
*skb
)
1600 return skb
->len
- NAPI_GRO_CB(skb
)->data_offset
;
1603 static inline void skb_gro_pull(struct sk_buff
*skb
, unsigned int len
)
1605 NAPI_GRO_CB(skb
)->data_offset
+= len
;
1608 static inline void *skb_gro_header_fast(struct sk_buff
*skb
,
1609 unsigned int offset
)
1611 return NAPI_GRO_CB(skb
)->frag0
+ offset
;
1614 static inline int skb_gro_header_hard(struct sk_buff
*skb
, unsigned int hlen
)
1616 return NAPI_GRO_CB(skb
)->frag0_len
< hlen
;
1619 static inline void *skb_gro_header_slow(struct sk_buff
*skb
, unsigned int hlen
,
1620 unsigned int offset
)
1622 if (!pskb_may_pull(skb
, hlen
))
1625 NAPI_GRO_CB(skb
)->frag0
= NULL
;
1626 NAPI_GRO_CB(skb
)->frag0_len
= 0;
1627 return skb
->data
+ offset
;
1630 static inline void *skb_gro_mac_header(struct sk_buff
*skb
)
1632 return NAPI_GRO_CB(skb
)->frag0
?: skb_mac_header(skb
);
1635 static inline void *skb_gro_network_header(struct sk_buff
*skb
)
1637 return (NAPI_GRO_CB(skb
)->frag0
?: skb
->data
) +
1638 skb_network_offset(skb
);
1641 static inline int dev_hard_header(struct sk_buff
*skb
, struct net_device
*dev
,
1642 unsigned short type
,
1643 const void *daddr
, const void *saddr
,
1646 if (!dev
->header_ops
|| !dev
->header_ops
->create
)
1649 return dev
->header_ops
->create(skb
, dev
, type
, daddr
, saddr
, len
);
1652 static inline int dev_parse_header(const struct sk_buff
*skb
,
1653 unsigned char *haddr
)
1655 const struct net_device
*dev
= skb
->dev
;
1657 if (!dev
->header_ops
|| !dev
->header_ops
->parse
)
1659 return dev
->header_ops
->parse(skb
, haddr
);
1662 typedef int gifconf_func_t(struct net_device
* dev
, char __user
* bufptr
, int len
);
1663 extern int register_gifconf(unsigned int family
, gifconf_func_t
* gifconf
);
1664 static inline int unregister_gifconf(unsigned int family
)
1666 return register_gifconf(family
, NULL
);
1670 * Incoming packets are placed on per-cpu queues
1672 struct softnet_data
{
1673 struct Qdisc
*output_queue
;
1674 struct Qdisc
**output_queue_tailp
;
1675 struct list_head poll_list
;
1676 struct sk_buff
*completion_queue
;
1677 struct sk_buff_head process_queue
;
1680 unsigned int processed
;
1681 unsigned int time_squeeze
;
1682 unsigned int cpu_collision
;
1683 unsigned int received_rps
;
1686 struct softnet_data
*rps_ipi_list
;
1688 /* Elements below can be accessed between CPUs for RPS */
1689 struct call_single_data csd ____cacheline_aligned_in_smp
;
1690 struct softnet_data
*rps_ipi_next
;
1692 unsigned int input_queue_head
;
1693 unsigned int input_queue_tail
;
1696 struct sk_buff_head input_pkt_queue
;
1697 struct napi_struct backlog
;
1700 static inline void input_queue_head_incr(struct softnet_data
*sd
)
1703 sd
->input_queue_head
++;
1707 static inline void input_queue_tail_incr_save(struct softnet_data
*sd
,
1708 unsigned int *qtail
)
1711 *qtail
= ++sd
->input_queue_tail
;
1715 DECLARE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
1717 extern void __netif_schedule(struct Qdisc
*q
);
1719 static inline void netif_schedule_queue(struct netdev_queue
*txq
)
1721 if (!test_bit(__QUEUE_STATE_XOFF
, &txq
->state
))
1722 __netif_schedule(txq
->qdisc
);
1725 static inline void netif_tx_schedule_all(struct net_device
*dev
)
1729 for (i
= 0; i
< dev
->num_tx_queues
; i
++)
1730 netif_schedule_queue(netdev_get_tx_queue(dev
, i
));
1733 static inline void netif_tx_start_queue(struct netdev_queue
*dev_queue
)
1735 clear_bit(__QUEUE_STATE_XOFF
, &dev_queue
->state
);
1739 * netif_start_queue - allow transmit
1740 * @dev: network device
1742 * Allow upper layers to call the device hard_start_xmit routine.
1744 static inline void netif_start_queue(struct net_device
*dev
)
1746 netif_tx_start_queue(netdev_get_tx_queue(dev
, 0));
1749 static inline void netif_tx_start_all_queues(struct net_device
*dev
)
1753 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
1754 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
1755 netif_tx_start_queue(txq
);
1759 static inline void netif_tx_wake_queue(struct netdev_queue
*dev_queue
)
1761 #ifdef CONFIG_NETPOLL_TRAP
1762 if (netpoll_trap()) {
1763 netif_tx_start_queue(dev_queue
);
1767 if (test_and_clear_bit(__QUEUE_STATE_XOFF
, &dev_queue
->state
))
1768 __netif_schedule(dev_queue
->qdisc
);
1772 * netif_wake_queue - restart transmit
1773 * @dev: network device
1775 * Allow upper layers to call the device hard_start_xmit routine.
1776 * Used for flow control when transmit resources are available.
1778 static inline void netif_wake_queue(struct net_device
*dev
)
1780 netif_tx_wake_queue(netdev_get_tx_queue(dev
, 0));
1783 static inline void netif_tx_wake_all_queues(struct net_device
*dev
)
1787 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
1788 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
1789 netif_tx_wake_queue(txq
);
1793 static inline void netif_tx_stop_queue(struct netdev_queue
*dev_queue
)
1795 if (WARN_ON(!dev_queue
)) {
1796 pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1799 set_bit(__QUEUE_STATE_XOFF
, &dev_queue
->state
);
1803 * netif_stop_queue - stop transmitted packets
1804 * @dev: network device
1806 * Stop upper layers calling the device hard_start_xmit routine.
1807 * Used for flow control when transmit resources are unavailable.
1809 static inline void netif_stop_queue(struct net_device
*dev
)
1811 netif_tx_stop_queue(netdev_get_tx_queue(dev
, 0));
1814 static inline void netif_tx_stop_all_queues(struct net_device
*dev
)
1818 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
1819 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
1820 netif_tx_stop_queue(txq
);
1824 static inline int netif_tx_queue_stopped(const struct netdev_queue
*dev_queue
)
1826 return test_bit(__QUEUE_STATE_XOFF
, &dev_queue
->state
);
1830 * netif_queue_stopped - test if transmit queue is flowblocked
1831 * @dev: network device
1833 * Test if transmit queue on device is currently unable to send.
1835 static inline int netif_queue_stopped(const struct net_device
*dev
)
1837 return netif_tx_queue_stopped(netdev_get_tx_queue(dev
, 0));
1840 static inline int netif_tx_queue_frozen_or_stopped(const struct netdev_queue
*dev_queue
)
1842 return dev_queue
->state
& QUEUE_STATE_XOFF_OR_FROZEN
;
1846 * netif_running - test if up
1847 * @dev: network device
1849 * Test if the device has been brought up.
1851 static inline int netif_running(const struct net_device
*dev
)
1853 return test_bit(__LINK_STATE_START
, &dev
->state
);
1857 * Routines to manage the subqueues on a device. We only need start
1858 * stop, and a check if it's stopped. All other device management is
1859 * done at the overall netdevice level.
1860 * Also test the device if we're multiqueue.
1864 * netif_start_subqueue - allow sending packets on subqueue
1865 * @dev: network device
1866 * @queue_index: sub queue index
1868 * Start individual transmit queue of a device with multiple transmit queues.
1870 static inline void netif_start_subqueue(struct net_device
*dev
, u16 queue_index
)
1872 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
1874 netif_tx_start_queue(txq
);
1878 * netif_stop_subqueue - stop sending packets on subqueue
1879 * @dev: network device
1880 * @queue_index: sub queue index
1882 * Stop individual transmit queue of a device with multiple transmit queues.
1884 static inline void netif_stop_subqueue(struct net_device
*dev
, u16 queue_index
)
1886 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
1887 #ifdef CONFIG_NETPOLL_TRAP
1891 netif_tx_stop_queue(txq
);
1895 * netif_subqueue_stopped - test status of subqueue
1896 * @dev: network device
1897 * @queue_index: sub queue index
1899 * Check individual transmit queue of a device with multiple transmit queues.
1901 static inline int __netif_subqueue_stopped(const struct net_device
*dev
,
1904 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
1906 return netif_tx_queue_stopped(txq
);
1909 static inline int netif_subqueue_stopped(const struct net_device
*dev
,
1910 struct sk_buff
*skb
)
1912 return __netif_subqueue_stopped(dev
, skb_get_queue_mapping(skb
));
1916 * netif_wake_subqueue - allow sending packets on subqueue
1917 * @dev: network device
1918 * @queue_index: sub queue index
1920 * Resume individual transmit queue of a device with multiple transmit queues.
1922 static inline void netif_wake_subqueue(struct net_device
*dev
, u16 queue_index
)
1924 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, queue_index
);
1925 #ifdef CONFIG_NETPOLL_TRAP
1929 if (test_and_clear_bit(__QUEUE_STATE_XOFF
, &txq
->state
))
1930 __netif_schedule(txq
->qdisc
);
1934 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
1935 * as a distribution range limit for the returned value.
1937 static inline u16
skb_tx_hash(const struct net_device
*dev
,
1938 const struct sk_buff
*skb
)
1940 return __skb_tx_hash(dev
, skb
, dev
->real_num_tx_queues
);
1944 * netif_is_multiqueue - test if device has multiple transmit queues
1945 * @dev: network device
1947 * Check if device has multiple transmit queues
1949 static inline int netif_is_multiqueue(const struct net_device
*dev
)
1951 return dev
->num_tx_queues
> 1;
1954 extern int netif_set_real_num_tx_queues(struct net_device
*dev
,
1958 extern int netif_set_real_num_rx_queues(struct net_device
*dev
,
1961 static inline int netif_set_real_num_rx_queues(struct net_device
*dev
,
1968 static inline int netif_copy_real_num_queues(struct net_device
*to_dev
,
1969 const struct net_device
*from_dev
)
1971 netif_set_real_num_tx_queues(to_dev
, from_dev
->real_num_tx_queues
);
1973 return netif_set_real_num_rx_queues(to_dev
,
1974 from_dev
->real_num_rx_queues
);
1980 /* Use this variant when it is known for sure that it
1981 * is executing from hardware interrupt context or with hardware interrupts
1984 extern void dev_kfree_skb_irq(struct sk_buff
*skb
);
1986 /* Use this variant in places where it could be invoked
1987 * from either hardware interrupt or other context, with hardware interrupts
1988 * either disabled or enabled.
1990 extern void dev_kfree_skb_any(struct sk_buff
*skb
);
1992 extern int netif_rx(struct sk_buff
*skb
);
1993 extern int netif_rx_ni(struct sk_buff
*skb
);
1994 extern int netif_receive_skb(struct sk_buff
*skb
);
1995 extern gro_result_t
dev_gro_receive(struct napi_struct
*napi
,
1996 struct sk_buff
*skb
);
1997 extern gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
);
1998 extern gro_result_t
napi_gro_receive(struct napi_struct
*napi
,
1999 struct sk_buff
*skb
);
2000 extern void napi_gro_flush(struct napi_struct
*napi
);
2001 extern struct sk_buff
* napi_get_frags(struct napi_struct
*napi
);
2002 extern gro_result_t
napi_frags_finish(struct napi_struct
*napi
,
2003 struct sk_buff
*skb
,
2005 extern struct sk_buff
* napi_frags_skb(struct napi_struct
*napi
);
2006 extern gro_result_t
napi_gro_frags(struct napi_struct
*napi
);
2008 static inline void napi_free_frags(struct napi_struct
*napi
)
2010 kfree_skb(napi
->skb
);
2014 extern int netdev_rx_handler_register(struct net_device
*dev
,
2015 rx_handler_func_t
*rx_handler
,
2016 void *rx_handler_data
);
2017 extern void netdev_rx_handler_unregister(struct net_device
*dev
);
2019 extern int dev_valid_name(const char *name
);
2020 extern int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*);
2021 extern int dev_ethtool(struct net
*net
, struct ifreq
*);
2022 extern unsigned dev_get_flags(const struct net_device
*);
2023 extern int __dev_change_flags(struct net_device
*, unsigned int flags
);
2024 extern int dev_change_flags(struct net_device
*, unsigned);
2025 extern void __dev_notify_flags(struct net_device
*, unsigned int old_flags
);
2026 extern int dev_change_name(struct net_device
*, const char *);
2027 extern int dev_set_alias(struct net_device
*, const char *, size_t);
2028 extern int dev_change_net_namespace(struct net_device
*,
2029 struct net
*, const char *);
2030 extern int dev_set_mtu(struct net_device
*, int);
2031 extern void dev_set_group(struct net_device
*, int);
2032 extern int dev_set_mac_address(struct net_device
*,
2034 extern int dev_hard_start_xmit(struct sk_buff
*skb
,
2035 struct net_device
*dev
,
2036 struct netdev_queue
*txq
);
2037 extern int dev_forward_skb(struct net_device
*dev
,
2038 struct sk_buff
*skb
);
2040 extern int netdev_budget
;
2042 /* Called by rtnetlink.c:rtnl_unlock() */
2043 extern void netdev_run_todo(void);
2046 * dev_put - release reference to device
2047 * @dev: network device
2049 * Release reference to device to allow it to be freed.
2051 static inline void dev_put(struct net_device
*dev
)
2053 irqsafe_cpu_dec(*dev
->pcpu_refcnt
);
2057 * dev_hold - get reference to device
2058 * @dev: network device
2060 * Hold reference to device to keep it from being freed.
2062 static inline void dev_hold(struct net_device
*dev
)
2064 irqsafe_cpu_inc(*dev
->pcpu_refcnt
);
2067 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
2068 * and _off may be called from IRQ context, but it is caller
2069 * who is responsible for serialization of these calls.
2071 * The name carrier is inappropriate, these functions should really be
2072 * called netif_lowerlayer_*() because they represent the state of any
2073 * kind of lower layer not just hardware media.
2076 extern void linkwatch_fire_event(struct net_device
*dev
);
2077 extern void linkwatch_forget_dev(struct net_device
*dev
);
2080 * netif_carrier_ok - test if carrier present
2081 * @dev: network device
2083 * Check if carrier is present on device
2085 static inline int netif_carrier_ok(const struct net_device
*dev
)
2087 return !test_bit(__LINK_STATE_NOCARRIER
, &dev
->state
);
2090 extern unsigned long dev_trans_start(struct net_device
*dev
);
2092 extern void __netdev_watchdog_up(struct net_device
*dev
);
2094 extern void netif_carrier_on(struct net_device
*dev
);
2096 extern void netif_carrier_off(struct net_device
*dev
);
2098 extern void netif_notify_peers(struct net_device
*dev
);
2101 * netif_dormant_on - mark device as dormant.
2102 * @dev: network device
2104 * Mark device as dormant (as per RFC2863).
2106 * The dormant state indicates that the relevant interface is not
2107 * actually in a condition to pass packets (i.e., it is not 'up') but is
2108 * in a "pending" state, waiting for some external event. For "on-
2109 * demand" interfaces, this new state identifies the situation where the
2110 * interface is waiting for events to place it in the up state.
2113 static inline void netif_dormant_on(struct net_device
*dev
)
2115 if (!test_and_set_bit(__LINK_STATE_DORMANT
, &dev
->state
))
2116 linkwatch_fire_event(dev
);
2120 * netif_dormant_off - set device as not dormant.
2121 * @dev: network device
2123 * Device is not in dormant state.
2125 static inline void netif_dormant_off(struct net_device
*dev
)
2127 if (test_and_clear_bit(__LINK_STATE_DORMANT
, &dev
->state
))
2128 linkwatch_fire_event(dev
);
2132 * netif_dormant - test if carrier present
2133 * @dev: network device
2135 * Check if carrier is present on device
2137 static inline int netif_dormant(const struct net_device
*dev
)
2139 return test_bit(__LINK_STATE_DORMANT
, &dev
->state
);
2144 * netif_oper_up - test if device is operational
2145 * @dev: network device
2147 * Check if carrier is operational
2149 static inline int netif_oper_up(const struct net_device
*dev
)
2151 return (dev
->operstate
== IF_OPER_UP
||
2152 dev
->operstate
== IF_OPER_UNKNOWN
/* backward compat */);
2156 * netif_device_present - is device available or removed
2157 * @dev: network device
2159 * Check if device has not been removed from system.
2161 static inline int netif_device_present(struct net_device
*dev
)
2163 return test_bit(__LINK_STATE_PRESENT
, &dev
->state
);
2166 extern void netif_device_detach(struct net_device
*dev
);
2168 extern void netif_device_attach(struct net_device
*dev
);
2171 * Network interface message level settings
2175 NETIF_MSG_DRV
= 0x0001,
2176 NETIF_MSG_PROBE
= 0x0002,
2177 NETIF_MSG_LINK
= 0x0004,
2178 NETIF_MSG_TIMER
= 0x0008,
2179 NETIF_MSG_IFDOWN
= 0x0010,
2180 NETIF_MSG_IFUP
= 0x0020,
2181 NETIF_MSG_RX_ERR
= 0x0040,
2182 NETIF_MSG_TX_ERR
= 0x0080,
2183 NETIF_MSG_TX_QUEUED
= 0x0100,
2184 NETIF_MSG_INTR
= 0x0200,
2185 NETIF_MSG_TX_DONE
= 0x0400,
2186 NETIF_MSG_RX_STATUS
= 0x0800,
2187 NETIF_MSG_PKTDATA
= 0x1000,
2188 NETIF_MSG_HW
= 0x2000,
2189 NETIF_MSG_WOL
= 0x4000,
2192 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
2193 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
2194 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
2195 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
2196 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
2197 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
2198 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
2199 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
2200 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
2201 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
2202 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
2203 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
2204 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
2205 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
2206 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
2208 static inline u32
netif_msg_init(int debug_value
, int default_msg_enable_bits
)
2211 if (debug_value
< 0 || debug_value
>= (sizeof(u32
) * 8))
2212 return default_msg_enable_bits
;
2213 if (debug_value
== 0) /* no output */
2215 /* set low N bits */
2216 return (1 << debug_value
) - 1;
2219 static inline void __netif_tx_lock(struct netdev_queue
*txq
, int cpu
)
2221 spin_lock(&txq
->_xmit_lock
);
2222 txq
->xmit_lock_owner
= cpu
;
2225 static inline void __netif_tx_lock_bh(struct netdev_queue
*txq
)
2227 spin_lock_bh(&txq
->_xmit_lock
);
2228 txq
->xmit_lock_owner
= smp_processor_id();
2231 static inline int __netif_tx_trylock(struct netdev_queue
*txq
)
2233 int ok
= spin_trylock(&txq
->_xmit_lock
);
2235 txq
->xmit_lock_owner
= smp_processor_id();
2239 static inline void __netif_tx_unlock(struct netdev_queue
*txq
)
2241 txq
->xmit_lock_owner
= -1;
2242 spin_unlock(&txq
->_xmit_lock
);
2245 static inline void __netif_tx_unlock_bh(struct netdev_queue
*txq
)
2247 txq
->xmit_lock_owner
= -1;
2248 spin_unlock_bh(&txq
->_xmit_lock
);
2251 static inline void txq_trans_update(struct netdev_queue
*txq
)
2253 if (txq
->xmit_lock_owner
!= -1)
2254 txq
->trans_start
= jiffies
;
2258 * netif_tx_lock - grab network device transmit lock
2259 * @dev: network device
2261 * Get network device transmit lock
2263 static inline void netif_tx_lock(struct net_device
*dev
)
2268 spin_lock(&dev
->tx_global_lock
);
2269 cpu
= smp_processor_id();
2270 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
2271 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
2273 /* We are the only thread of execution doing a
2274 * freeze, but we have to grab the _xmit_lock in
2275 * order to synchronize with threads which are in
2276 * the ->hard_start_xmit() handler and already
2277 * checked the frozen bit.
2279 __netif_tx_lock(txq
, cpu
);
2280 set_bit(__QUEUE_STATE_FROZEN
, &txq
->state
);
2281 __netif_tx_unlock(txq
);
2285 static inline void netif_tx_lock_bh(struct net_device
*dev
)
2291 static inline void netif_tx_unlock(struct net_device
*dev
)
2295 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
2296 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
2298 /* No need to grab the _xmit_lock here. If the
2299 * queue is not stopped for another reason, we
2302 clear_bit(__QUEUE_STATE_FROZEN
, &txq
->state
);
2303 netif_schedule_queue(txq
);
2305 spin_unlock(&dev
->tx_global_lock
);
2308 static inline void netif_tx_unlock_bh(struct net_device
*dev
)
2310 netif_tx_unlock(dev
);
2314 #define HARD_TX_LOCK(dev, txq, cpu) { \
2315 if ((dev->features & NETIF_F_LLTX) == 0) { \
2316 __netif_tx_lock(txq, cpu); \
2320 #define HARD_TX_UNLOCK(dev, txq) { \
2321 if ((dev->features & NETIF_F_LLTX) == 0) { \
2322 __netif_tx_unlock(txq); \
2326 static inline void netif_tx_disable(struct net_device
*dev
)
2332 cpu
= smp_processor_id();
2333 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
2334 struct netdev_queue
*txq
= netdev_get_tx_queue(dev
, i
);
2336 __netif_tx_lock(txq
, cpu
);
2337 netif_tx_stop_queue(txq
);
2338 __netif_tx_unlock(txq
);
2343 static inline void netif_addr_lock(struct net_device
*dev
)
2345 spin_lock(&dev
->addr_list_lock
);
2348 static inline void netif_addr_lock_bh(struct net_device
*dev
)
2350 spin_lock_bh(&dev
->addr_list_lock
);
2353 static inline void netif_addr_unlock(struct net_device
*dev
)
2355 spin_unlock(&dev
->addr_list_lock
);
2358 static inline void netif_addr_unlock_bh(struct net_device
*dev
)
2360 spin_unlock_bh(&dev
->addr_list_lock
);
2364 * dev_addrs walker. Should be used only for read access. Call with
2365 * rcu_read_lock held.
2367 #define for_each_dev_addr(dev, ha) \
2368 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2370 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
2372 extern void ether_setup(struct net_device
*dev
);
2374 /* Support for loadable net-drivers */
2375 extern struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
2376 void (*setup
)(struct net_device
*),
2377 unsigned int txqs
, unsigned int rxqs
);
2378 #define alloc_netdev(sizeof_priv, name, setup) \
2379 alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
2381 #define alloc_netdev_mq(sizeof_priv, name, setup, count) \
2382 alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
2384 extern int register_netdev(struct net_device
*dev
);
2385 extern void unregister_netdev(struct net_device
*dev
);
2387 /* General hardware address lists handling functions */
2388 extern int __hw_addr_add_multiple(struct netdev_hw_addr_list
*to_list
,
2389 struct netdev_hw_addr_list
*from_list
,
2390 int addr_len
, unsigned char addr_type
);
2391 extern void __hw_addr_del_multiple(struct netdev_hw_addr_list
*to_list
,
2392 struct netdev_hw_addr_list
*from_list
,
2393 int addr_len
, unsigned char addr_type
);
2394 extern int __hw_addr_sync(struct netdev_hw_addr_list
*to_list
,
2395 struct netdev_hw_addr_list
*from_list
,
2397 extern void __hw_addr_unsync(struct netdev_hw_addr_list
*to_list
,
2398 struct netdev_hw_addr_list
*from_list
,
2400 extern void __hw_addr_flush(struct netdev_hw_addr_list
*list
);
2401 extern void __hw_addr_init(struct netdev_hw_addr_list
*list
);
2403 /* Functions used for device addresses handling */
2404 extern int dev_addr_add(struct net_device
*dev
, unsigned char *addr
,
2405 unsigned char addr_type
);
2406 extern int dev_addr_del(struct net_device
*dev
, unsigned char *addr
,
2407 unsigned char addr_type
);
2408 extern int dev_addr_add_multiple(struct net_device
*to_dev
,
2409 struct net_device
*from_dev
,
2410 unsigned char addr_type
);
2411 extern int dev_addr_del_multiple(struct net_device
*to_dev
,
2412 struct net_device
*from_dev
,
2413 unsigned char addr_type
);
2414 extern void dev_addr_flush(struct net_device
*dev
);
2415 extern int dev_addr_init(struct net_device
*dev
);
2417 /* Functions used for unicast addresses handling */
2418 extern int dev_uc_add(struct net_device
*dev
, unsigned char *addr
);
2419 extern int dev_uc_del(struct net_device
*dev
, unsigned char *addr
);
2420 extern int dev_uc_sync(struct net_device
*to
, struct net_device
*from
);
2421 extern void dev_uc_unsync(struct net_device
*to
, struct net_device
*from
);
2422 extern void dev_uc_flush(struct net_device
*dev
);
2423 extern void dev_uc_init(struct net_device
*dev
);
2425 /* Functions used for multicast addresses handling */
2426 extern int dev_mc_add(struct net_device
*dev
, unsigned char *addr
);
2427 extern int dev_mc_add_global(struct net_device
*dev
, unsigned char *addr
);
2428 extern int dev_mc_del(struct net_device
*dev
, unsigned char *addr
);
2429 extern int dev_mc_del_global(struct net_device
*dev
, unsigned char *addr
);
2430 extern int dev_mc_sync(struct net_device
*to
, struct net_device
*from
);
2431 extern void dev_mc_unsync(struct net_device
*to
, struct net_device
*from
);
2432 extern void dev_mc_flush(struct net_device
*dev
);
2433 extern void dev_mc_init(struct net_device
*dev
);
2435 /* Functions used for secondary unicast and multicast support */
2436 extern void dev_set_rx_mode(struct net_device
*dev
);
2437 extern void __dev_set_rx_mode(struct net_device
*dev
);
2438 extern int dev_set_promiscuity(struct net_device
*dev
, int inc
);
2439 extern int dev_set_allmulti(struct net_device
*dev
, int inc
);
2440 extern void netdev_state_change(struct net_device
*dev
);
2441 extern int netdev_bonding_change(struct net_device
*dev
,
2442 unsigned long event
);
2443 extern void netdev_features_change(struct net_device
*dev
);
2444 /* Load a device via the kmod */
2445 extern void dev_load(struct net
*net
, const char *name
);
2446 extern void dev_mcast_init(void);
2447 extern struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
2448 struct rtnl_link_stats64
*storage
);
2450 extern int netdev_max_backlog
;
2451 extern int netdev_tstamp_prequeue
;
2452 extern int weight_p
;
2453 extern int bpf_jit_enable
;
2454 extern int netdev_set_master(struct net_device
*dev
, struct net_device
*master
);
2455 extern int netdev_set_bond_master(struct net_device
*dev
,
2456 struct net_device
*master
);
2457 extern int skb_checksum_help(struct sk_buff
*skb
);
2458 extern struct sk_buff
*skb_gso_segment(struct sk_buff
*skb
,
2459 netdev_features_t features
);
2461 extern void netdev_rx_csum_fault(struct net_device
*dev
);
2463 static inline void netdev_rx_csum_fault(struct net_device
*dev
)
2467 /* rx skb timestamps */
2468 extern void net_enable_timestamp(void);
2469 extern void net_disable_timestamp(void);
2471 #ifdef CONFIG_PROC_FS
2472 extern void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
);
2473 extern void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
);
2474 extern void dev_seq_stop(struct seq_file
*seq
, void *v
);
2477 extern int netdev_class_create_file(struct class_attribute
*class_attr
);
2478 extern void netdev_class_remove_file(struct class_attribute
*class_attr
);
2480 extern struct kobj_ns_type_operations net_ns_type_operations
;
2482 extern const char *netdev_drivername(const struct net_device
*dev
);
2484 extern void linkwatch_run_queue(void);
2486 static inline netdev_features_t
netdev_get_wanted_features(
2487 struct net_device
*dev
)
2489 return (dev
->features
& ~dev
->hw_features
) | dev
->wanted_features
;
2491 netdev_features_t
netdev_increment_features(netdev_features_t all
,
2492 netdev_features_t one
, netdev_features_t mask
);
2493 int __netdev_update_features(struct net_device
*dev
);
2494 void netdev_update_features(struct net_device
*dev
);
2495 void netdev_change_features(struct net_device
*dev
);
2497 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
2498 struct net_device
*dev
);
2500 netdev_features_t
netif_skb_features(struct sk_buff
*skb
);
2502 static inline int net_gso_ok(netdev_features_t features
, int gso_type
)
2504 netdev_features_t feature
= gso_type
<< NETIF_F_GSO_SHIFT
;
2506 /* check flags correspondence */
2507 BUILD_BUG_ON(SKB_GSO_TCPV4
!= (NETIF_F_TSO
>> NETIF_F_GSO_SHIFT
));
2508 BUILD_BUG_ON(SKB_GSO_UDP
!= (NETIF_F_UFO
>> NETIF_F_GSO_SHIFT
));
2509 BUILD_BUG_ON(SKB_GSO_DODGY
!= (NETIF_F_GSO_ROBUST
>> NETIF_F_GSO_SHIFT
));
2510 BUILD_BUG_ON(SKB_GSO_TCP_ECN
!= (NETIF_F_TSO_ECN
>> NETIF_F_GSO_SHIFT
));
2511 BUILD_BUG_ON(SKB_GSO_TCPV6
!= (NETIF_F_TSO6
>> NETIF_F_GSO_SHIFT
));
2512 BUILD_BUG_ON(SKB_GSO_FCOE
!= (NETIF_F_FSO
>> NETIF_F_GSO_SHIFT
));
2514 return (features
& feature
) == feature
;
2517 static inline int skb_gso_ok(struct sk_buff
*skb
, netdev_features_t features
)
2519 return net_gso_ok(features
, skb_shinfo(skb
)->gso_type
) &&
2520 (!skb_has_frag_list(skb
) || (features
& NETIF_F_FRAGLIST
));
2523 static inline int netif_needs_gso(struct sk_buff
*skb
,
2524 netdev_features_t features
)
2526 return skb_is_gso(skb
) && (!skb_gso_ok(skb
, features
) ||
2527 unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
));
2530 static inline void netif_set_gso_max_size(struct net_device
*dev
,
2533 dev
->gso_max_size
= size
;
2536 static inline int netif_is_bond_slave(struct net_device
*dev
)
2538 return dev
->flags
& IFF_SLAVE
&& dev
->priv_flags
& IFF_BONDING
;
2541 extern struct pernet_operations __net_initdata loopback_net_ops
;
2543 /* Logging, debugging and troubleshooting/diagnostic helpers. */
2545 /* netdev_printk helpers, similar to dev_printk */
2547 static inline const char *netdev_name(const struct net_device
*dev
)
2549 if (dev
->reg_state
!= NETREG_REGISTERED
)
2550 return "(unregistered net_device)";
2554 extern int __netdev_printk(const char *level
, const struct net_device
*dev
,
2555 struct va_format
*vaf
);
2557 extern __printf(3, 4)
2558 int netdev_printk(const char *level
, const struct net_device
*dev
,
2559 const char *format
, ...);
2560 extern __printf(2, 3)
2561 int netdev_emerg(const struct net_device
*dev
, const char *format
, ...);
2562 extern __printf(2, 3)
2563 int netdev_alert(const struct net_device
*dev
, const char *format
, ...);
2564 extern __printf(2, 3)
2565 int netdev_crit(const struct net_device
*dev
, const char *format
, ...);
2566 extern __printf(2, 3)
2567 int netdev_err(const struct net_device
*dev
, const char *format
, ...);
2568 extern __printf(2, 3)
2569 int netdev_warn(const struct net_device
*dev
, const char *format
, ...);
2570 extern __printf(2, 3)
2571 int netdev_notice(const struct net_device
*dev
, const char *format
, ...);
2572 extern __printf(2, 3)
2573 int netdev_info(const struct net_device
*dev
, const char *format
, ...);
2575 #define MODULE_ALIAS_NETDEV(device) \
2576 MODULE_ALIAS("netdev-" device)
2579 #define netdev_dbg(__dev, format, args...) \
2580 netdev_printk(KERN_DEBUG, __dev, format, ##args)
2581 #elif defined(CONFIG_DYNAMIC_DEBUG)
2582 #define netdev_dbg(__dev, format, args...) \
2584 dynamic_netdev_dbg(__dev, format, ##args); \
2587 #define netdev_dbg(__dev, format, args...) \
2590 netdev_printk(KERN_DEBUG, __dev, format, ##args); \
2595 #if defined(VERBOSE_DEBUG)
2596 #define netdev_vdbg netdev_dbg
2599 #define netdev_vdbg(dev, format, args...) \
2602 netdev_printk(KERN_DEBUG, dev, format, ##args); \
2608 * netdev_WARN() acts like dev_printk(), but with the key difference
2609 * of using a WARN/WARN_ON to get the message out, including the
2610 * file/line information and a backtrace.
2612 #define netdev_WARN(dev, format, args...) \
2613 WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
2615 /* netif printk helpers, similar to netdev_printk */
2617 #define netif_printk(priv, type, level, dev, fmt, args...) \
2619 if (netif_msg_##type(priv)) \
2620 netdev_printk(level, (dev), fmt, ##args); \
2623 #define netif_level(level, priv, type, dev, fmt, args...) \
2625 if (netif_msg_##type(priv)) \
2626 netdev_##level(dev, fmt, ##args); \
2629 #define netif_emerg(priv, type, dev, fmt, args...) \
2630 netif_level(emerg, priv, type, dev, fmt, ##args)
2631 #define netif_alert(priv, type, dev, fmt, args...) \
2632 netif_level(alert, priv, type, dev, fmt, ##args)
2633 #define netif_crit(priv, type, dev, fmt, args...) \
2634 netif_level(crit, priv, type, dev, fmt, ##args)
2635 #define netif_err(priv, type, dev, fmt, args...) \
2636 netif_level(err, priv, type, dev, fmt, ##args)
2637 #define netif_warn(priv, type, dev, fmt, args...) \
2638 netif_level(warn, priv, type, dev, fmt, ##args)
2639 #define netif_notice(priv, type, dev, fmt, args...) \
2640 netif_level(notice, priv, type, dev, fmt, ##args)
2641 #define netif_info(priv, type, dev, fmt, args...) \
2642 netif_level(info, priv, type, dev, fmt, ##args)
2645 #define netif_dbg(priv, type, dev, format, args...) \
2646 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2647 #elif defined(CONFIG_DYNAMIC_DEBUG)
2648 #define netif_dbg(priv, type, netdev, format, args...) \
2650 if (netif_msg_##type(priv)) \
2651 dynamic_netdev_dbg(netdev, format, ##args); \
2654 #define netif_dbg(priv, type, dev, format, args...) \
2657 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2662 #if defined(VERBOSE_DEBUG)
2663 #define netif_vdbg netif_dbg
2665 #define netif_vdbg(priv, type, dev, format, args...) \
2668 netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2673 #endif /* __KERNEL__ */
2675 #endif /* _LINUX_NETDEVICE_H */