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>
33 #include <linux/timer.h>
34 #include <linux/delay.h>
35 #include <asm/atomic.h>
36 #include <asm/cache.h>
37 #include <asm/byteorder.h>
39 #include <linux/device.h>
40 #include <linux/percpu.h>
41 #include <linux/dmaengine.h>
42 #include <linux/workqueue.h>
44 #include <net/net_namespace.h>
47 #include <net/dcbnl.h>
55 /* source back-compat hooks */
56 #define SET_ETHTOOL_OPS(netdev,ops) \
57 ( (netdev)->ethtool_ops = (ops) )
59 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
60 functions are available. */
61 #define HAVE_FREE_NETDEV /* free_netdev() */
62 #define HAVE_NETDEV_PRIV /* netdev_priv() */
64 #define NET_XMIT_SUCCESS 0
65 #define NET_XMIT_DROP 1 /* skb dropped */
66 #define NET_XMIT_CN 2 /* congestion notification */
67 #define NET_XMIT_POLICED 3 /* skb is shot by police */
68 #define NET_XMIT_MASK 0xFFFF /* qdisc flags in net/sch_generic.h */
70 /* Backlog congestion levels */
71 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
72 #define NET_RX_DROP 1 /* packet dropped */
73 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
74 #define NET_RX_CN_MOD 3 /* Storm on its way! */
75 #define NET_RX_CN_HIGH 4 /* The storm is here */
76 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
78 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
79 * indicates that the device will soon be dropping packets, or already drops
80 * some packets of the same priority; prompting us to send less aggressively. */
81 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e))
82 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
86 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
88 /* Driver transmit return codes */
89 #define NETDEV_TX_OK 0 /* driver took care of packet */
90 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
91 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
96 * Compute the worst case header length according to the protocols
100 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
101 # if defined(CONFIG_MAC80211_MESH)
102 # define LL_MAX_HEADER 128
104 # define LL_MAX_HEADER 96
106 #elif defined(CONFIG_TR)
107 # define LL_MAX_HEADER 48
109 # define LL_MAX_HEADER 32
112 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
113 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
114 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
115 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
116 #define MAX_HEADER LL_MAX_HEADER
118 #define MAX_HEADER (LL_MAX_HEADER + 48)
121 #endif /* __KERNEL__ */
124 * Network device statistics. Akin to the 2.0 ether stats but
125 * with byte counters.
128 struct net_device_stats
130 unsigned long rx_packets; /* total packets received */
131 unsigned long tx_packets; /* total packets transmitted */
132 unsigned long rx_bytes; /* total bytes received */
133 unsigned long tx_bytes; /* total bytes transmitted */
134 unsigned long rx_errors; /* bad packets received */
135 unsigned long tx_errors; /* packet transmit problems */
136 unsigned long rx_dropped; /* no space in linux buffers */
137 unsigned long tx_dropped; /* no space available in linux */
138 unsigned long multicast; /* multicast packets received */
139 unsigned long collisions;
141 /* detailed rx_errors: */
142 unsigned long rx_length_errors;
143 unsigned long rx_over_errors; /* receiver ring buff overflow */
144 unsigned long rx_crc_errors; /* recved pkt with crc error */
145 unsigned long rx_frame_errors; /* recv'd frame alignment error */
146 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
147 unsigned long rx_missed_errors; /* receiver missed packet */
149 /* detailed tx_errors */
150 unsigned long tx_aborted_errors;
151 unsigned long tx_carrier_errors;
152 unsigned long tx_fifo_errors;
153 unsigned long tx_heartbeat_errors;
154 unsigned long tx_window_errors;
157 unsigned long rx_compressed;
158 unsigned long tx_compressed;
162 /* Media selection options. */
175 #include <linux/cache.h>
176 #include <linux/skbuff.h>
182 struct netif_rx_stats
186 unsigned time_squeeze;
187 unsigned cpu_collision;
190 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
194 struct dev_addr_list *next;
195 u8 da_addr[MAX_ADDR_LEN];
203 * We tag multicasts with these structures.
206 #define dev_mc_list dev_addr_list
207 #define dmi_addr da_addr
208 #define dmi_addrlen da_addrlen
209 #define dmi_users da_users
210 #define dmi_gusers da_gusers
214 struct hh_cache *hh_next; /* Next entry */
215 atomic_t hh_refcnt; /* number of users */
217 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
219 * They are mostly read, but hh_refcnt may be changed quite frequently,
220 * incurring cache line ping pongs.
222 __be16 hh_type ____cacheline_aligned_in_smp;
223 /* protocol identifier, f.e ETH_P_IP
224 * NOTE: For VLANs, this will be the
225 * encapuslated type. --BLG
227 u16 hh_len; /* length of header */
228 int (*hh_output)(struct sk_buff *skb);
231 /* cached hardware header; allow for machine alignment needs. */
232 #define HH_DATA_MOD 16
233 #define HH_DATA_OFF(__len) \
234 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
235 #define HH_DATA_ALIGN(__len) \
236 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
237 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
240 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
242 * dev->hard_header_len ? (dev->hard_header_len +
243 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
245 * We could use other alignment values, but we must maintain the
246 * relationship HH alignment <= LL alignment.
248 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
251 #define LL_RESERVED_SPACE(dev) \
252 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
253 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
254 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
255 #define LL_ALLOCATED_SPACE(dev) \
256 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
259 int (*create) (struct sk_buff *skb, struct net_device *dev,
260 unsigned short type, const void *daddr,
261 const void *saddr, unsigned len);
262 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
263 int (*rebuild)(struct sk_buff *skb);
264 #define HAVE_HEADER_CACHE
265 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
266 void (*cache_update)(struct hh_cache *hh,
267 const struct net_device *dev,
268 const unsigned char *haddr);
271 /* These flag bits are private to the generic network queueing
272 * layer, they may not be explicitly referenced by any other
279 __LINK_STATE_PRESENT,
280 __LINK_STATE_NOCARRIER,
281 __LINK_STATE_LINKWATCH_PENDING,
282 __LINK_STATE_DORMANT,
287 * This structure holds at boot time configured netdevice settings. They
288 * are then used in the device probing.
290 struct netdev_boot_setup {
294 #define NETDEV_BOOT_SETUP_MAX 8
296 extern int __init netdev_boot_setup(char *str);
299 * Structure for NAPI scheduling similar to tasklet but with weighting
302 /* The poll_list must only be managed by the entity which
303 * changes the state of the NAPI_STATE_SCHED bit. This means
304 * whoever atomically sets that bit can add this napi_struct
305 * to the per-cpu poll_list, and whoever clears that bit
306 * can remove from the list right before clearing the bit.
308 struct list_head poll_list;
312 int (*poll)(struct napi_struct *, int);
313 #ifdef CONFIG_NETPOLL
314 spinlock_t poll_lock;
317 struct net_device *dev;
318 struct list_head dev_list;
319 struct sk_buff *gro_list;
325 NAPI_STATE_SCHED, /* Poll is scheduled */
326 NAPI_STATE_DISABLE, /* Disable pending */
327 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
330 extern void __napi_schedule(struct napi_struct *n);
332 static inline int napi_disable_pending(struct napi_struct *n)
334 return test_bit(NAPI_STATE_DISABLE, &n->state);
338 * napi_schedule_prep - check if napi can be scheduled
341 * Test if NAPI routine is already running, and if not mark
342 * it as running. This is used as a condition variable
343 * insure only one NAPI poll instance runs. We also make
344 * sure there is no pending NAPI disable.
346 static inline int napi_schedule_prep(struct napi_struct *n)
348 return !napi_disable_pending(n) &&
349 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
353 * napi_schedule - schedule NAPI poll
356 * Schedule NAPI poll routine to be called if it is not already
359 static inline void napi_schedule(struct napi_struct *n)
361 if (napi_schedule_prep(n))
365 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
366 static inline int napi_reschedule(struct napi_struct *napi)
368 if (napi_schedule_prep(napi)) {
369 __napi_schedule(napi);
376 * napi_complete - NAPI processing complete
379 * Mark NAPI processing as complete.
381 extern void __napi_complete(struct napi_struct *n);
382 extern void napi_complete(struct napi_struct *n);
385 * napi_disable - prevent NAPI from scheduling
388 * Stop NAPI from being scheduled on this context.
389 * Waits till any outstanding processing completes.
391 static inline void napi_disable(struct napi_struct *n)
393 set_bit(NAPI_STATE_DISABLE, &n->state);
394 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
396 clear_bit(NAPI_STATE_DISABLE, &n->state);
400 * napi_enable - enable NAPI scheduling
403 * Resume NAPI from being scheduled on this context.
404 * Must be paired with napi_disable.
406 static inline void napi_enable(struct napi_struct *n)
408 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
409 smp_mb__before_clear_bit();
410 clear_bit(NAPI_STATE_SCHED, &n->state);
415 * napi_synchronize - wait until NAPI is not running
418 * Wait until NAPI is done being scheduled on this context.
419 * Waits till any outstanding processing completes but
420 * does not disable future activations.
422 static inline void napi_synchronize(const struct napi_struct *n)
424 while (test_bit(NAPI_STATE_SCHED, &n->state))
428 # define napi_synchronize(n) barrier()
431 enum netdev_queue_state_t
434 __QUEUE_STATE_FROZEN,
437 struct netdev_queue {
438 struct net_device *dev;
441 spinlock_t _xmit_lock;
443 struct Qdisc *qdisc_sleeping;
444 } ____cacheline_aligned_in_smp;
448 * This structure defines the management hooks for network devices.
449 * The following hooks can be defined; unless noted otherwise, they are
450 * optional and can be filled with a null pointer.
452 * int (*ndo_init)(struct net_device *dev);
453 * This function is called once when network device is registered.
454 * The network device can use this to any late stage initializaton
455 * or semantic validattion. It can fail with an error code which will
456 * be propogated back to register_netdev
458 * void (*ndo_uninit)(struct net_device *dev);
459 * This function is called when device is unregistered or when registration
460 * fails. It is not called if init fails.
462 * int (*ndo_open)(struct net_device *dev);
463 * This function is called when network device transistions to the up
466 * int (*ndo_stop)(struct net_device *dev);
467 * This function is called when network device transistions to the down
470 * int (*ndo_hard_start_xmit)(struct sk_buff *skb, struct net_device *dev);
471 * Called when a packet needs to be transmitted.
472 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY, or NETDEV_TX_LOCKED,
473 * Required can not be NULL.
475 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
476 * Called to decide which queue to when device supports multiple
479 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
480 * This function is called to allow device receiver to make
481 * changes to configuration when multicast or promiscious is enabled.
483 * void (*ndo_set_rx_mode)(struct net_device *dev);
484 * This function is called device changes address list filtering.
486 * void (*ndo_set_multicast_list)(struct net_device *dev);
487 * This function is called when the multicast address list changes.
489 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
490 * This function is called when the Media Access Control address
491 * needs to be changed. If not this interface is not defined, the
492 * mac address can not be changed.
494 * int (*ndo_validate_addr)(struct net_device *dev);
495 * Test if Media Access Control address is valid for the device.
497 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
498 * Called when a user request an ioctl which can't be handled by
499 * the generic interface code. If not defined ioctl's return
500 * not supported error code.
502 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
503 * Used to set network devices bus interface parameters. This interface
504 * is retained for legacy reason, new devices should use the bus
505 * interface (PCI) for low level management.
507 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
508 * Called when a user wants to change the Maximum Transfer Unit
509 * of a device. If not defined, any request to change MTU will
510 * will return an error.
512 * void (*ndo_tx_timeout)(struct net_device *dev);
513 * Callback uses when the transmitter has not made any progress
514 * for dev->watchdog ticks.
516 * struct net_device_stats* (*get_stats)(struct net_device *dev);
517 * Called when a user wants to get the network device usage
518 * statistics. If not defined, the counters in dev->stats will
521 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
522 * If device support VLAN receive accleration
523 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
524 * when vlan groups for the device changes. Note: grp is NULL
525 * if no vlan's groups are being used.
527 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
528 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
529 * this function is called when a VLAN id is registered.
531 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
532 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
533 * this function is called when a VLAN id is unregistered.
535 * void (*ndo_poll_controller)(struct net_device *dev);
537 #define HAVE_NET_DEVICE_OPS
538 struct net_device_ops {
539 int (*ndo_init)(struct net_device *dev);
540 void (*ndo_uninit)(struct net_device *dev);
541 int (*ndo_open)(struct net_device *dev);
542 int (*ndo_stop)(struct net_device *dev);
543 int (*ndo_start_xmit) (struct sk_buff *skb,
544 struct net_device *dev);
545 u16 (*ndo_select_queue)(struct net_device *dev,
546 struct sk_buff *skb);
547 #define HAVE_CHANGE_RX_FLAGS
548 void (*ndo_change_rx_flags)(struct net_device *dev,
550 #define HAVE_SET_RX_MODE
551 void (*ndo_set_rx_mode)(struct net_device *dev);
552 #define HAVE_MULTICAST
553 void (*ndo_set_multicast_list)(struct net_device *dev);
554 #define HAVE_SET_MAC_ADDR
555 int (*ndo_set_mac_address)(struct net_device *dev,
557 #define HAVE_VALIDATE_ADDR
558 int (*ndo_validate_addr)(struct net_device *dev);
559 #define HAVE_PRIVATE_IOCTL
560 int (*ndo_do_ioctl)(struct net_device *dev,
561 struct ifreq *ifr, int cmd);
562 #define HAVE_SET_CONFIG
563 int (*ndo_set_config)(struct net_device *dev,
565 #define HAVE_CHANGE_MTU
566 int (*ndo_change_mtu)(struct net_device *dev,
568 int (*ndo_neigh_setup)(struct net_device *dev,
569 struct neigh_parms *);
570 #define HAVE_TX_TIMEOUT
571 void (*ndo_tx_timeout) (struct net_device *dev);
573 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
575 void (*ndo_vlan_rx_register)(struct net_device *dev,
576 struct vlan_group *grp);
577 void (*ndo_vlan_rx_add_vid)(struct net_device *dev,
579 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
581 #ifdef CONFIG_NET_POLL_CONTROLLER
582 #define HAVE_NETDEV_POLL
583 void (*ndo_poll_controller)(struct net_device *dev);
588 * The DEVICE structure.
589 * Actually, this whole structure is a big mistake. It mixes I/O
590 * data with strictly "high-level" data, and it has to know about
591 * almost every data structure used in the INET module.
593 * FIXME: cleanup struct net_device such that network protocol info
601 * This is the first field of the "visible" part of this structure
602 * (i.e. as seen by users in the "Space.c" file). It is the name
606 /* device name hash chain */
607 struct hlist_node name_hlist;
612 * I/O specific fields
613 * FIXME: Merge these and struct ifmap into one
615 unsigned long mem_end; /* shared mem end */
616 unsigned long mem_start; /* shared mem start */
617 unsigned long base_addr; /* device I/O address */
618 unsigned int irq; /* device IRQ number */
621 * Some hardware also needs these fields, but they are not
622 * part of the usual set specified in Space.c.
625 unsigned char if_port; /* Selectable AUI, TP,..*/
626 unsigned char dma; /* DMA channel */
630 struct list_head dev_list;
631 struct list_head napi_list;
633 /* Net device features */
634 unsigned long features;
635 #define NETIF_F_SG 1 /* Scatter/gather IO. */
636 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
637 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
638 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
639 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
640 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
641 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
642 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
643 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
644 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
645 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
646 #define NETIF_F_GSO 2048 /* Enable software GSO. */
647 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
648 /* do not use LLTX in new drivers */
649 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
650 #define NETIF_F_GRO 16384 /* Generic receive offload */
651 #define NETIF_F_LRO 32768 /* large receive offload */
653 /* Segmentation offload features */
654 #define NETIF_F_GSO_SHIFT 16
655 #define NETIF_F_GSO_MASK 0xffff0000
656 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
657 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
658 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
659 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
660 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
662 /* List of features with software fallbacks. */
663 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
666 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
667 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
668 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
669 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
672 * If one device supports one of these features, then enable them
673 * for all in netdev_increment_features.
675 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
676 NETIF_F_SG | NETIF_F_HIGHDMA | \
679 /* Interface index. Unique device identifier */
683 struct net_device_stats stats;
685 #ifdef CONFIG_WIRELESS_EXT
686 /* List of functions to handle Wireless Extensions (instead of ioctl).
687 * See <net/iw_handler.h> for details. Jean II */
688 const struct iw_handler_def * wireless_handlers;
689 /* Instance data managed by the core of Wireless Extensions. */
690 struct iw_public_data * wireless_data;
692 /* Management operations */
693 const struct net_device_ops *netdev_ops;
694 const struct ethtool_ops *ethtool_ops;
696 /* Hardware header description */
697 const struct header_ops *header_ops;
699 unsigned int flags; /* interface flags (a la BSD) */
700 unsigned short gflags;
701 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
702 unsigned short padded; /* How much padding added by alloc_netdev() */
704 unsigned char operstate; /* RFC2863 operstate */
705 unsigned char link_mode; /* mapping policy to operstate */
707 unsigned mtu; /* interface MTU value */
708 unsigned short type; /* interface hardware type */
709 unsigned short hard_header_len; /* hardware hdr length */
711 /* extra head- and tailroom the hardware may need, but not in all cases
712 * can this be guaranteed, especially tailroom. Some cases also use
713 * LL_MAX_HEADER instead to allocate the skb.
715 unsigned short needed_headroom;
716 unsigned short needed_tailroom;
718 struct net_device *master; /* Pointer to master device of a group,
719 * which this device is member of.
722 /* Interface address info. */
723 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
724 unsigned char addr_len; /* hardware address length */
725 unsigned short dev_id; /* for shared network cards */
727 spinlock_t addr_list_lock;
728 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */
729 int uc_count; /* Number of installed ucasts */
731 struct dev_addr_list *mc_list; /* Multicast mac addresses */
732 int mc_count; /* Number of installed mcasts */
733 unsigned int promiscuity;
734 unsigned int allmulti;
737 /* Protocol specific pointers */
739 #ifdef CONFIG_NET_DSA
740 void *dsa_ptr; /* dsa specific data */
742 void *atalk_ptr; /* AppleTalk link */
743 void *ip_ptr; /* IPv4 specific data */
744 void *dn_ptr; /* DECnet specific data */
745 void *ip6_ptr; /* IPv6 specific data */
746 void *ec_ptr; /* Econet specific data */
747 void *ax25_ptr; /* AX.25 specific data */
748 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
749 assign before registering */
752 * Cache line mostly used on receive path (including eth_type_trans())
754 unsigned long last_rx; /* Time of last Rx */
755 /* Interface address info used in eth_type_trans() */
756 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
757 because most packets are unicast) */
759 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
761 struct netdev_queue rx_queue;
763 struct netdev_queue *_tx ____cacheline_aligned_in_smp;
765 /* Number of TX queues allocated at alloc_netdev_mq() time */
766 unsigned int num_tx_queues;
768 /* Number of TX queues currently active in device */
769 unsigned int real_num_tx_queues;
771 unsigned long tx_queue_len; /* Max frames per queue allowed */
772 spinlock_t tx_global_lock;
774 * One part is mostly used on xmit path (device)
776 /* These may be needed for future network-power-down code. */
777 unsigned long trans_start; /* Time (in jiffies) of last Tx */
779 int watchdog_timeo; /* used by dev_watchdog() */
780 struct timer_list watchdog_timer;
782 /* Number of references to this device */
783 atomic_t refcnt ____cacheline_aligned_in_smp;
785 /* delayed register/unregister */
786 struct list_head todo_list;
787 /* device index hash chain */
788 struct hlist_node index_hlist;
790 struct net_device *link_watch_next;
792 /* register/unregister state machine */
793 enum { NETREG_UNINITIALIZED=0,
794 NETREG_REGISTERED, /* completed register_netdevice */
795 NETREG_UNREGISTERING, /* called unregister_netdevice */
796 NETREG_UNREGISTERED, /* completed unregister todo */
797 NETREG_RELEASED, /* called free_netdev */
800 /* Called from unregister, can be used to call free_netdev */
801 void (*destructor)(struct net_device *dev);
803 #ifdef CONFIG_NETPOLL
804 struct netpoll_info *npinfo;
808 /* Network namespace this network device is inside */
812 /* mid-layer private */
816 struct net_bridge_port *br_port;
818 struct macvlan_port *macvlan_port;
820 struct garp_port *garp_port;
822 /* class/net/name entry */
824 /* space for optional statistics and wireless sysfs groups */
825 struct attribute_group *sysfs_groups[3];
827 /* rtnetlink link ops */
828 const struct rtnl_link_ops *rtnl_link_ops;
830 /* VLAN feature mask */
831 unsigned long vlan_features;
833 /* for setting kernel sock attribute on TCP connection setup */
834 #define GSO_MAX_SIZE 65536
835 unsigned int gso_max_size;
838 /* Data Center Bridging netlink ops */
839 struct dcbnl_rtnl_ops *dcbnl_ops;
842 #ifdef CONFIG_COMPAT_NET_DEV_OPS
844 int (*init)(struct net_device *dev);
845 void (*uninit)(struct net_device *dev);
846 int (*open)(struct net_device *dev);
847 int (*stop)(struct net_device *dev);
848 int (*hard_start_xmit) (struct sk_buff *skb,
849 struct net_device *dev);
850 u16 (*select_queue)(struct net_device *dev,
851 struct sk_buff *skb);
852 void (*change_rx_flags)(struct net_device *dev,
854 void (*set_rx_mode)(struct net_device *dev);
855 void (*set_multicast_list)(struct net_device *dev);
856 int (*set_mac_address)(struct net_device *dev,
858 int (*validate_addr)(struct net_device *dev);
859 int (*do_ioctl)(struct net_device *dev,
860 struct ifreq *ifr, int cmd);
861 int (*set_config)(struct net_device *dev,
863 int (*change_mtu)(struct net_device *dev, int new_mtu);
864 int (*neigh_setup)(struct net_device *dev,
865 struct neigh_parms *);
866 void (*tx_timeout) (struct net_device *dev);
867 struct net_device_stats* (*get_stats)(struct net_device *dev);
868 void (*vlan_rx_register)(struct net_device *dev,
869 struct vlan_group *grp);
870 void (*vlan_rx_add_vid)(struct net_device *dev,
872 void (*vlan_rx_kill_vid)(struct net_device *dev,
874 #ifdef CONFIG_NET_POLL_CONTROLLER
875 void (*poll_controller)(struct net_device *dev);
880 #define to_net_dev(d) container_of(d, struct net_device, dev)
882 #define NETDEV_ALIGN 32
883 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
886 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
889 return &dev->_tx[index];
892 static inline void netdev_for_each_tx_queue(struct net_device *dev,
893 void (*f)(struct net_device *,
894 struct netdev_queue *,
900 for (i = 0; i < dev->num_tx_queues; i++)
901 f(dev, &dev->_tx[i], arg);
905 * Net namespace inlines
908 struct net *dev_net(const struct net_device *dev)
918 void dev_net_set(struct net_device *dev, struct net *net)
921 release_net(dev->nd_net);
922 dev->nd_net = hold_net(net);
926 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
928 #ifdef CONFIG_NET_DSA_TAG_DSA
929 if (dev->dsa_ptr != NULL)
930 return dsa_uses_dsa_tags(dev->dsa_ptr);
936 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
938 #ifdef CONFIG_NET_DSA_TAG_TRAILER
939 if (dev->dsa_ptr != NULL)
940 return dsa_uses_trailer_tags(dev->dsa_ptr);
947 * netdev_priv - access network device private data
948 * @dev: network device
950 * Get network device private data
952 static inline void *netdev_priv(const struct net_device *dev)
954 return (char *)dev + ((sizeof(struct net_device)
955 + NETDEV_ALIGN_CONST)
956 & ~NETDEV_ALIGN_CONST);
959 /* Set the sysfs physical device reference for the network logical device
960 * if set prior to registration will cause a symlink during initialization.
962 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
965 * netif_napi_add - initialize a napi context
966 * @dev: network device
967 * @napi: napi context
968 * @poll: polling function
969 * @weight: default weight
971 * netif_napi_add() must be used to initialize a napi context prior to calling
972 * *any* of the other napi related functions.
974 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
975 int (*poll)(struct napi_struct *, int), int weight);
978 * netif_napi_del - remove a napi context
979 * @napi: napi context
981 * netif_napi_del() removes a napi context from the network device napi list
983 void netif_napi_del(struct napi_struct *napi);
986 /* This is non-zero if the packet may be of the same flow. */
989 /* This is non-zero if the packet cannot be merged with the new skb. */
992 /* Number of segments aggregated. */
999 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1001 struct packet_type {
1002 __be16 type; /* This is really htons(ether_type). */
1003 struct net_device *dev; /* NULL is wildcarded here */
1004 int (*func) (struct sk_buff *,
1005 struct net_device *,
1006 struct packet_type *,
1007 struct net_device *);
1008 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
1010 int (*gso_send_check)(struct sk_buff *skb);
1011 struct sk_buff **(*gro_receive)(struct sk_buff **head,
1012 struct sk_buff *skb);
1013 int (*gro_complete)(struct sk_buff *skb);
1014 void *af_packet_priv;
1015 struct list_head list;
1018 struct napi_gro_fraginfo {
1019 skb_frag_t frags[MAX_SKB_FRAGS];
1020 unsigned int nr_frags;
1021 unsigned int ip_summed;
1026 #include <linux/interrupt.h>
1027 #include <linux/notifier.h>
1029 extern rwlock_t dev_base_lock; /* Device list lock */
1032 #define for_each_netdev(net, d) \
1033 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1034 #define for_each_netdev_safe(net, d, n) \
1035 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1036 #define for_each_netdev_continue(net, d) \
1037 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1038 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
1040 static inline struct net_device *next_net_device(struct net_device *dev)
1042 struct list_head *lh;
1046 lh = dev->dev_list.next;
1047 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1050 static inline struct net_device *first_net_device(struct net *net)
1052 return list_empty(&net->dev_base_head) ? NULL :
1053 net_device_entry(net->dev_base_head.next);
1056 extern int netdev_boot_setup_check(struct net_device *dev);
1057 extern unsigned long netdev_boot_base(const char *prefix, int unit);
1058 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1059 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1060 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1061 extern void dev_add_pack(struct packet_type *pt);
1062 extern void dev_remove_pack(struct packet_type *pt);
1063 extern void __dev_remove_pack(struct packet_type *pt);
1065 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags,
1066 unsigned short mask);
1067 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
1068 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
1069 extern int dev_alloc_name(struct net_device *dev, const char *name);
1070 extern int dev_open(struct net_device *dev);
1071 extern int dev_close(struct net_device *dev);
1072 extern void dev_disable_lro(struct net_device *dev);
1073 extern int dev_queue_xmit(struct sk_buff *skb);
1074 extern int register_netdevice(struct net_device *dev);
1075 extern void unregister_netdevice(struct net_device *dev);
1076 extern void free_netdev(struct net_device *dev);
1077 extern void synchronize_net(void);
1078 extern int register_netdevice_notifier(struct notifier_block *nb);
1079 extern int unregister_netdevice_notifier(struct notifier_block *nb);
1080 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1081 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
1082 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
1083 extern int dev_restart(struct net_device *dev);
1084 #ifdef CONFIG_NETPOLL_TRAP
1085 extern int netpoll_trap(void);
1088 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1089 unsigned short type,
1090 const void *daddr, const void *saddr,
1093 if (!dev->header_ops || !dev->header_ops->create)
1096 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1099 static inline int dev_parse_header(const struct sk_buff *skb,
1100 unsigned char *haddr)
1102 const struct net_device *dev = skb->dev;
1104 if (!dev->header_ops || !dev->header_ops->parse)
1106 return dev->header_ops->parse(skb, haddr);
1109 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1110 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1111 static inline int unregister_gifconf(unsigned int family)
1113 return register_gifconf(family, NULL);
1117 * Incoming packets are placed on per-cpu queues so that
1118 * no locking is needed.
1122 struct Qdisc *output_queue;
1123 struct sk_buff_head input_pkt_queue;
1124 struct list_head poll_list;
1125 struct sk_buff *completion_queue;
1127 struct napi_struct backlog;
1128 #ifdef CONFIG_NET_DMA
1129 struct dma_chan *net_dma;
1133 DECLARE_PER_CPU(struct softnet_data,softnet_data);
1135 #define HAVE_NETIF_QUEUE
1137 extern void __netif_schedule(struct Qdisc *q);
1139 static inline void netif_schedule_queue(struct netdev_queue *txq)
1141 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1142 __netif_schedule(txq->qdisc);
1145 static inline void netif_tx_schedule_all(struct net_device *dev)
1149 for (i = 0; i < dev->num_tx_queues; i++)
1150 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1153 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1155 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1159 * netif_start_queue - allow transmit
1160 * @dev: network device
1162 * Allow upper layers to call the device hard_start_xmit routine.
1164 static inline void netif_start_queue(struct net_device *dev)
1166 netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1169 static inline void netif_tx_start_all_queues(struct net_device *dev)
1173 for (i = 0; i < dev->num_tx_queues; i++) {
1174 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1175 netif_tx_start_queue(txq);
1179 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1181 #ifdef CONFIG_NETPOLL_TRAP
1182 if (netpoll_trap()) {
1183 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1187 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1188 __netif_schedule(dev_queue->qdisc);
1192 * netif_wake_queue - restart transmit
1193 * @dev: network device
1195 * Allow upper layers to call the device hard_start_xmit routine.
1196 * Used for flow control when transmit resources are available.
1198 static inline void netif_wake_queue(struct net_device *dev)
1200 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1203 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1207 for (i = 0; i < dev->num_tx_queues; i++) {
1208 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1209 netif_tx_wake_queue(txq);
1213 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1215 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1219 * netif_stop_queue - stop transmitted packets
1220 * @dev: network device
1222 * Stop upper layers calling the device hard_start_xmit routine.
1223 * Used for flow control when transmit resources are unavailable.
1225 static inline void netif_stop_queue(struct net_device *dev)
1227 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1230 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1234 for (i = 0; i < dev->num_tx_queues; i++) {
1235 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1236 netif_tx_stop_queue(txq);
1240 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1242 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1246 * netif_queue_stopped - test if transmit queue is flowblocked
1247 * @dev: network device
1249 * Test if transmit queue on device is currently unable to send.
1251 static inline int netif_queue_stopped(const struct net_device *dev)
1253 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1256 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1258 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1262 * netif_running - test if up
1263 * @dev: network device
1265 * Test if the device has been brought up.
1267 static inline int netif_running(const struct net_device *dev)
1269 return test_bit(__LINK_STATE_START, &dev->state);
1273 * Routines to manage the subqueues on a device. We only need start
1274 * stop, and a check if it's stopped. All other device management is
1275 * done at the overall netdevice level.
1276 * Also test the device if we're multiqueue.
1280 * netif_start_subqueue - allow sending packets on subqueue
1281 * @dev: network device
1282 * @queue_index: sub queue index
1284 * Start individual transmit queue of a device with multiple transmit queues.
1286 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1288 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1289 clear_bit(__QUEUE_STATE_XOFF, &txq->state);
1293 * netif_stop_subqueue - stop sending packets on subqueue
1294 * @dev: network device
1295 * @queue_index: sub queue index
1297 * Stop individual transmit queue of a device with multiple transmit queues.
1299 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1301 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1302 #ifdef CONFIG_NETPOLL_TRAP
1306 set_bit(__QUEUE_STATE_XOFF, &txq->state);
1310 * netif_subqueue_stopped - test status of subqueue
1311 * @dev: network device
1312 * @queue_index: sub queue index
1314 * Check individual transmit queue of a device with multiple transmit queues.
1316 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1319 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1320 return test_bit(__QUEUE_STATE_XOFF, &txq->state);
1323 static inline int netif_subqueue_stopped(const struct net_device *dev,
1324 struct sk_buff *skb)
1326 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1330 * netif_wake_subqueue - allow sending packets on subqueue
1331 * @dev: network device
1332 * @queue_index: sub queue index
1334 * Resume individual transmit queue of a device with multiple transmit queues.
1336 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1338 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1339 #ifdef CONFIG_NETPOLL_TRAP
1343 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1344 __netif_schedule(txq->qdisc);
1348 * netif_is_multiqueue - test if device has multiple transmit queues
1349 * @dev: network device
1351 * Check if device has multiple transmit queues
1353 static inline int netif_is_multiqueue(const struct net_device *dev)
1355 return (dev->num_tx_queues > 1);
1358 /* Use this variant when it is known for sure that it
1359 * is executing from hardware interrupt context or with hardware interrupts
1362 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1364 /* Use this variant in places where it could be invoked
1365 * from either hardware interrupt or other context, with hardware interrupts
1366 * either disabled or enabled.
1368 extern void dev_kfree_skb_any(struct sk_buff *skb);
1370 #define HAVE_NETIF_RX 1
1371 extern int netif_rx(struct sk_buff *skb);
1372 extern int netif_rx_ni(struct sk_buff *skb);
1373 #define HAVE_NETIF_RECEIVE_SKB 1
1374 extern int netif_receive_skb(struct sk_buff *skb);
1375 extern void napi_gro_flush(struct napi_struct *napi);
1376 extern int napi_gro_receive(struct napi_struct *napi,
1377 struct sk_buff *skb);
1378 extern int napi_gro_frags(struct napi_struct *napi,
1379 struct napi_gro_fraginfo *info);
1380 extern void netif_nit_deliver(struct sk_buff *skb);
1381 extern int dev_valid_name(const char *name);
1382 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1383 extern int dev_ethtool(struct net *net, struct ifreq *);
1384 extern unsigned dev_get_flags(const struct net_device *);
1385 extern int dev_change_flags(struct net_device *, unsigned);
1386 extern int dev_change_name(struct net_device *, const char *);
1387 extern int dev_set_alias(struct net_device *, const char *, size_t);
1388 extern int dev_change_net_namespace(struct net_device *,
1389 struct net *, const char *);
1390 extern int dev_set_mtu(struct net_device *, int);
1391 extern int dev_set_mac_address(struct net_device *,
1393 extern int dev_hard_start_xmit(struct sk_buff *skb,
1394 struct net_device *dev,
1395 struct netdev_queue *txq);
1397 extern int netdev_budget;
1399 /* Called by rtnetlink.c:rtnl_unlock() */
1400 extern void netdev_run_todo(void);
1403 * dev_put - release reference to device
1404 * @dev: network device
1406 * Release reference to device to allow it to be freed.
1408 static inline void dev_put(struct net_device *dev)
1410 atomic_dec(&dev->refcnt);
1414 * dev_hold - get reference to device
1415 * @dev: network device
1417 * Hold reference to device to keep it from being freed.
1419 static inline void dev_hold(struct net_device *dev)
1421 atomic_inc(&dev->refcnt);
1424 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1425 * and _off may be called from IRQ context, but it is caller
1426 * who is responsible for serialization of these calls.
1428 * The name carrier is inappropriate, these functions should really be
1429 * called netif_lowerlayer_*() because they represent the state of any
1430 * kind of lower layer not just hardware media.
1433 extern void linkwatch_fire_event(struct net_device *dev);
1436 * netif_carrier_ok - test if carrier present
1437 * @dev: network device
1439 * Check if carrier is present on device
1441 static inline int netif_carrier_ok(const struct net_device *dev)
1443 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1446 extern void __netdev_watchdog_up(struct net_device *dev);
1448 extern void netif_carrier_on(struct net_device *dev);
1450 extern void netif_carrier_off(struct net_device *dev);
1453 * netif_dormant_on - mark device as dormant.
1454 * @dev: network device
1456 * Mark device as dormant (as per RFC2863).
1458 * The dormant state indicates that the relevant interface is not
1459 * actually in a condition to pass packets (i.e., it is not 'up') but is
1460 * in a "pending" state, waiting for some external event. For "on-
1461 * demand" interfaces, this new state identifies the situation where the
1462 * interface is waiting for events to place it in the up state.
1465 static inline void netif_dormant_on(struct net_device *dev)
1467 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1468 linkwatch_fire_event(dev);
1472 * netif_dormant_off - set device as not dormant.
1473 * @dev: network device
1475 * Device is not in dormant state.
1477 static inline void netif_dormant_off(struct net_device *dev)
1479 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1480 linkwatch_fire_event(dev);
1484 * netif_dormant - test if carrier present
1485 * @dev: network device
1487 * Check if carrier is present on device
1489 static inline int netif_dormant(const struct net_device *dev)
1491 return test_bit(__LINK_STATE_DORMANT, &dev->state);
1496 * netif_oper_up - test if device is operational
1497 * @dev: network device
1499 * Check if carrier is operational
1501 static inline int netif_oper_up(const struct net_device *dev) {
1502 return (dev->operstate == IF_OPER_UP ||
1503 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1507 * netif_device_present - is device available or removed
1508 * @dev: network device
1510 * Check if device has not been removed from system.
1512 static inline int netif_device_present(struct net_device *dev)
1514 return test_bit(__LINK_STATE_PRESENT, &dev->state);
1517 extern void netif_device_detach(struct net_device *dev);
1519 extern void netif_device_attach(struct net_device *dev);
1522 * Network interface message level settings
1524 #define HAVE_NETIF_MSG 1
1527 NETIF_MSG_DRV = 0x0001,
1528 NETIF_MSG_PROBE = 0x0002,
1529 NETIF_MSG_LINK = 0x0004,
1530 NETIF_MSG_TIMER = 0x0008,
1531 NETIF_MSG_IFDOWN = 0x0010,
1532 NETIF_MSG_IFUP = 0x0020,
1533 NETIF_MSG_RX_ERR = 0x0040,
1534 NETIF_MSG_TX_ERR = 0x0080,
1535 NETIF_MSG_TX_QUEUED = 0x0100,
1536 NETIF_MSG_INTR = 0x0200,
1537 NETIF_MSG_TX_DONE = 0x0400,
1538 NETIF_MSG_RX_STATUS = 0x0800,
1539 NETIF_MSG_PKTDATA = 0x1000,
1540 NETIF_MSG_HW = 0x2000,
1541 NETIF_MSG_WOL = 0x4000,
1544 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
1545 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
1546 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
1547 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
1548 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
1549 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
1550 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
1551 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
1552 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1553 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
1554 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
1555 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1556 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
1557 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
1558 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
1560 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1563 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1564 return default_msg_enable_bits;
1565 if (debug_value == 0) /* no output */
1567 /* set low N bits */
1568 return (1 << debug_value) - 1;
1571 /* Test if receive needs to be scheduled but only if up */
1572 static inline int netif_rx_schedule_prep(struct napi_struct *napi)
1574 return napi_schedule_prep(napi);
1577 /* Add interface to tail of rx poll list. This assumes that _prep has
1578 * already been called and returned 1.
1580 static inline void __netif_rx_schedule(struct napi_struct *napi)
1582 __napi_schedule(napi);
1585 /* Try to reschedule poll. Called by irq handler. */
1587 static inline void netif_rx_schedule(struct napi_struct *napi)
1589 if (netif_rx_schedule_prep(napi))
1590 __netif_rx_schedule(napi);
1593 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */
1594 static inline int netif_rx_reschedule(struct napi_struct *napi)
1596 if (napi_schedule_prep(napi)) {
1597 __netif_rx_schedule(napi);
1603 /* same as netif_rx_complete, except that local_irq_save(flags)
1604 * has already been issued
1606 static inline void __netif_rx_complete(struct napi_struct *napi)
1608 __napi_complete(napi);
1611 /* Remove interface from poll list: it must be in the poll list
1612 * on current cpu. This primitive is called by dev->poll(), when
1613 * it completes the work. The device cannot be out of poll list at this
1614 * moment, it is BUG().
1616 static inline void netif_rx_complete(struct napi_struct *napi)
1618 napi_complete(napi);
1621 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1623 spin_lock(&txq->_xmit_lock);
1624 txq->xmit_lock_owner = cpu;
1627 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1629 spin_lock_bh(&txq->_xmit_lock);
1630 txq->xmit_lock_owner = smp_processor_id();
1633 static inline int __netif_tx_trylock(struct netdev_queue *txq)
1635 int ok = spin_trylock(&txq->_xmit_lock);
1637 txq->xmit_lock_owner = smp_processor_id();
1641 static inline void __netif_tx_unlock(struct netdev_queue *txq)
1643 txq->xmit_lock_owner = -1;
1644 spin_unlock(&txq->_xmit_lock);
1647 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1649 txq->xmit_lock_owner = -1;
1650 spin_unlock_bh(&txq->_xmit_lock);
1654 * netif_tx_lock - grab network device transmit lock
1655 * @dev: network device
1657 * Get network device transmit lock
1659 static inline void netif_tx_lock(struct net_device *dev)
1664 spin_lock(&dev->tx_global_lock);
1665 cpu = smp_processor_id();
1666 for (i = 0; i < dev->num_tx_queues; i++) {
1667 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1669 /* We are the only thread of execution doing a
1670 * freeze, but we have to grab the _xmit_lock in
1671 * order to synchronize with threads which are in
1672 * the ->hard_start_xmit() handler and already
1673 * checked the frozen bit.
1675 __netif_tx_lock(txq, cpu);
1676 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1677 __netif_tx_unlock(txq);
1681 static inline void netif_tx_lock_bh(struct net_device *dev)
1687 static inline void netif_tx_unlock(struct net_device *dev)
1691 for (i = 0; i < dev->num_tx_queues; i++) {
1692 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1694 /* No need to grab the _xmit_lock here. If the
1695 * queue is not stopped for another reason, we
1698 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1699 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1700 __netif_schedule(txq->qdisc);
1702 spin_unlock(&dev->tx_global_lock);
1705 static inline void netif_tx_unlock_bh(struct net_device *dev)
1707 netif_tx_unlock(dev);
1711 #define HARD_TX_LOCK(dev, txq, cpu) { \
1712 if ((dev->features & NETIF_F_LLTX) == 0) { \
1713 __netif_tx_lock(txq, cpu); \
1717 #define HARD_TX_UNLOCK(dev, txq) { \
1718 if ((dev->features & NETIF_F_LLTX) == 0) { \
1719 __netif_tx_unlock(txq); \
1723 static inline void netif_tx_disable(struct net_device *dev)
1729 cpu = smp_processor_id();
1730 for (i = 0; i < dev->num_tx_queues; i++) {
1731 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1733 __netif_tx_lock(txq, cpu);
1734 netif_tx_stop_queue(txq);
1735 __netif_tx_unlock(txq);
1740 static inline void netif_addr_lock(struct net_device *dev)
1742 spin_lock(&dev->addr_list_lock);
1745 static inline void netif_addr_lock_bh(struct net_device *dev)
1747 spin_lock_bh(&dev->addr_list_lock);
1750 static inline void netif_addr_unlock(struct net_device *dev)
1752 spin_unlock(&dev->addr_list_lock);
1755 static inline void netif_addr_unlock_bh(struct net_device *dev)
1757 spin_unlock_bh(&dev->addr_list_lock);
1760 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1762 extern void ether_setup(struct net_device *dev);
1764 /* Support for loadable net-drivers */
1765 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1766 void (*setup)(struct net_device *),
1767 unsigned int queue_count);
1768 #define alloc_netdev(sizeof_priv, name, setup) \
1769 alloc_netdev_mq(sizeof_priv, name, setup, 1)
1770 extern int register_netdev(struct net_device *dev);
1771 extern void unregister_netdev(struct net_device *dev);
1772 /* Functions used for secondary unicast and multicast support */
1773 extern void dev_set_rx_mode(struct net_device *dev);
1774 extern void __dev_set_rx_mode(struct net_device *dev);
1775 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1776 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen);
1777 extern int dev_unicast_sync(struct net_device *to, struct net_device *from);
1778 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from);
1779 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1780 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1781 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
1782 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
1783 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1784 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1785 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1786 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1787 extern int dev_set_promiscuity(struct net_device *dev, int inc);
1788 extern int dev_set_allmulti(struct net_device *dev, int inc);
1789 extern void netdev_state_change(struct net_device *dev);
1790 extern void netdev_bonding_change(struct net_device *dev);
1791 extern void netdev_features_change(struct net_device *dev);
1792 /* Load a device via the kmod */
1793 extern void dev_load(struct net *net, const char *name);
1794 extern void dev_mcast_init(void);
1795 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
1797 extern int netdev_max_backlog;
1798 extern int weight_p;
1799 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1800 extern int skb_checksum_help(struct sk_buff *skb);
1801 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1803 extern void netdev_rx_csum_fault(struct net_device *dev);
1805 static inline void netdev_rx_csum_fault(struct net_device *dev)
1809 /* rx skb timestamps */
1810 extern void net_enable_timestamp(void);
1811 extern void net_disable_timestamp(void);
1813 #ifdef CONFIG_PROC_FS
1814 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1815 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1816 extern void dev_seq_stop(struct seq_file *seq, void *v);
1819 extern int netdev_class_create_file(struct class_attribute *class_attr);
1820 extern void netdev_class_remove_file(struct class_attribute *class_attr);
1822 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1824 extern void linkwatch_run_queue(void);
1826 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
1827 unsigned long mask);
1828 unsigned long netdev_fix_features(unsigned long features, const char *name);
1830 static inline int net_gso_ok(int features, int gso_type)
1832 int feature = gso_type << NETIF_F_GSO_SHIFT;
1833 return (features & feature) == feature;
1836 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1838 return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1841 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1843 return skb_is_gso(skb) &&
1844 (!skb_gso_ok(skb, dev->features) ||
1845 (skb_shinfo(skb)->frag_list &&
1846 !(dev->features & NETIF_F_FRAGLIST)) ||
1847 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1850 static inline void netif_set_gso_max_size(struct net_device *dev,
1853 dev->gso_max_size = size;
1856 /* On bonding slaves other than the currently active slave, suppress
1857 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1858 * ARP on active-backup slaves with arp_validate enabled.
1860 static inline int skb_bond_should_drop(struct sk_buff *skb)
1862 struct net_device *dev = skb->dev;
1863 struct net_device *master = dev->master;
1866 if (master->priv_flags & IFF_MASTER_ARPMON)
1867 dev->last_rx = jiffies;
1869 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1870 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1871 skb->protocol == __constant_htons(ETH_P_ARP))
1874 if (master->priv_flags & IFF_MASTER_ALB) {
1875 if (skb->pkt_type != PACKET_BROADCAST &&
1876 skb->pkt_type != PACKET_MULTICAST)
1879 if (master->priv_flags & IFF_MASTER_8023AD &&
1880 skb->protocol == __constant_htons(ETH_P_SLOW))
1889 extern struct pernet_operations __net_initdata loopback_net_ops;
1890 #endif /* __KERNEL__ */
1892 #endif /* _LINUX_DEV_H */