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.Cox@linux.org>
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>
51 /* source back-compat hooks */
52 #define SET_ETHTOOL_OPS(netdev,ops) \
53 ( (netdev)->ethtool_ops = (ops) )
55 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
56 functions are available. */
57 #define HAVE_FREE_NETDEV /* free_netdev() */
58 #define HAVE_NETDEV_PRIV /* netdev_priv() */
60 #define NET_XMIT_SUCCESS 0
61 #define NET_XMIT_DROP 1 /* skb dropped */
62 #define NET_XMIT_CN 2 /* congestion notification */
63 #define NET_XMIT_POLICED 3 /* skb is shot by police */
64 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue;
65 (TC use only - dev_queue_xmit
66 returns this as NET_XMIT_SUCCESS) */
68 /* Backlog congestion levels */
69 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
70 #define NET_RX_DROP 1 /* packet dropped */
71 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
72 #define NET_RX_CN_MOD 3 /* Storm on its way! */
73 #define NET_RX_CN_HIGH 4 /* The storm is here */
74 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
76 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
77 * indicates that the device will soon be dropping packets, or already drops
78 * some packets of the same priority; prompting us to send less aggressively. */
79 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e))
80 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
84 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
86 /* Driver transmit return codes */
87 #define NETDEV_TX_OK 0 /* driver took care of packet */
88 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
89 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
92 * Compute the worst case header length according to the protocols
96 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
97 #define LL_MAX_HEADER 32
99 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
100 #define LL_MAX_HEADER 96
102 #define LL_MAX_HEADER 48
106 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
107 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
108 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
109 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
110 #define MAX_HEADER LL_MAX_HEADER
112 #define MAX_HEADER (LL_MAX_HEADER + 48)
115 struct net_device_subqueue
117 /* Give a control state for each queue. This struct may contain
118 * per-queue locks in the future.
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 #define LL_RESERVED_SPACE(dev) \
249 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
250 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
251 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
253 /* These flag bits are private to the generic network queueing
254 * layer, they may not be explicitly referenced by any other
262 __LINK_STATE_PRESENT,
264 __LINK_STATE_NOCARRIER,
265 __LINK_STATE_LINKWATCH_PENDING,
266 __LINK_STATE_DORMANT,
267 __LINK_STATE_QDISC_RUNNING,
272 * This structure holds at boot time configured netdevice settings. They
273 * are then used in the device probing.
275 struct netdev_boot_setup {
279 #define NETDEV_BOOT_SETUP_MAX 8
281 extern int __init netdev_boot_setup(char *str);
284 * Structure for NAPI scheduling similar to tasklet but with weighting
287 /* The poll_list must only be managed by the entity which
288 * changes the state of the NAPI_STATE_SCHED bit. This means
289 * whoever atomically sets that bit can add this napi_struct
290 * to the per-cpu poll_list, and whoever clears that bit
291 * can remove from the list right before clearing the bit.
293 struct list_head poll_list;
297 int (*poll)(struct napi_struct *, int);
298 #ifdef CONFIG_NETPOLL
299 spinlock_t poll_lock;
301 struct net_device *dev;
302 struct list_head dev_list;
308 NAPI_STATE_SCHED, /* Poll is scheduled */
311 extern void FASTCALL(__napi_schedule(struct napi_struct *n));
314 * napi_schedule_prep - check if napi can be scheduled
317 * Test if NAPI routine is already running, and if not mark
318 * it as running. This is used as a condition variable
319 * insure only one NAPI poll instance runs
321 static inline int napi_schedule_prep(struct napi_struct *n)
323 return !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
327 * napi_schedule - schedule NAPI poll
330 * Schedule NAPI poll routine to be called if it is not already
333 static inline void napi_schedule(struct napi_struct *n)
335 if (napi_schedule_prep(n))
340 * napi_complete - NAPI processing complete
343 * Mark NAPI processing as complete.
345 static inline void __napi_complete(struct napi_struct *n)
347 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
348 list_del(&n->poll_list);
349 smp_mb__before_clear_bit();
350 clear_bit(NAPI_STATE_SCHED, &n->state);
353 static inline void napi_complete(struct napi_struct *n)
361 * napi_disable - prevent NAPI from scheduling
364 * Stop NAPI from being scheduled on this context.
365 * Waits till any outstanding processing completes.
367 static inline void napi_disable(struct napi_struct *n)
369 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
370 msleep_interruptible(1);
374 * napi_enable - enable NAPI scheduling
377 * Resume NAPI from being scheduled on this context.
378 * Must be paired with napi_disable.
380 static inline void napi_enable(struct napi_struct *n)
382 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
383 smp_mb__before_clear_bit();
384 clear_bit(NAPI_STATE_SCHED, &n->state);
388 * The DEVICE structure.
389 * Actually, this whole structure is a big mistake. It mixes I/O
390 * data with strictly "high-level" data, and it has to know about
391 * almost every data structure used in the INET module.
393 * FIXME: cleanup struct net_device such that network protocol info
401 * This is the first field of the "visible" part of this structure
402 * (i.e. as seen by users in the "Space.c" file). It is the name
406 /* device name hash chain */
407 struct hlist_node name_hlist;
410 * I/O specific fields
411 * FIXME: Merge these and struct ifmap into one
413 unsigned long mem_end; /* shared mem end */
414 unsigned long mem_start; /* shared mem start */
415 unsigned long base_addr; /* device I/O address */
416 unsigned int irq; /* device IRQ number */
419 * Some hardware also needs these fields, but they are not
420 * part of the usual set specified in Space.c.
423 unsigned char if_port; /* Selectable AUI, TP,..*/
424 unsigned char dma; /* DMA channel */
428 struct list_head dev_list;
429 #ifdef CONFIG_NETPOLL
430 struct list_head napi_list;
433 /* The device initialization function. Called only once. */
434 int (*init)(struct net_device *dev);
436 /* ------- Fields preinitialized in Space.c finish here ------- */
438 /* Net device features */
439 unsigned long features;
440 #define NETIF_F_SG 1 /* Scatter/gather IO. */
441 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
442 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
443 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
444 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
445 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
446 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
447 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
448 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
449 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
450 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
451 #define NETIF_F_GSO 2048 /* Enable software GSO. */
452 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
453 /* do not use LLTX in new drivers */
454 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
455 #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */
456 #define NETIF_F_LRO 32768 /* large receive offload */
458 /* Segmentation offload features */
459 #define NETIF_F_GSO_SHIFT 16
460 #define NETIF_F_GSO_MASK 0xffff0000
461 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
462 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
463 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
464 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
465 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
467 /* List of features with software fallbacks. */
468 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
471 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
472 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
473 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
474 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
476 struct net_device *next_sched;
478 /* Interface index. Unique device identifier */
483 struct net_device_stats* (*get_stats)(struct net_device *dev);
484 struct net_device_stats stats;
486 #ifdef CONFIG_WIRELESS_EXT
487 /* List of functions to handle Wireless Extensions (instead of ioctl).
488 * See <net/iw_handler.h> for details. Jean II */
489 const struct iw_handler_def * wireless_handlers;
490 /* Instance data managed by the core of Wireless Extensions. */
491 struct iw_public_data * wireless_data;
493 const struct ethtool_ops *ethtool_ops;
496 * This marks the end of the "visible" part of the structure. All
497 * fields hereafter are internal to the system, and may change at
498 * will (read: may be cleaned up at will).
502 unsigned int flags; /* interface flags (a la BSD) */
503 unsigned short gflags;
504 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
505 unsigned short padded; /* How much padding added by alloc_netdev() */
507 unsigned char operstate; /* RFC2863 operstate */
508 unsigned char link_mode; /* mapping policy to operstate */
510 unsigned mtu; /* interface MTU value */
511 unsigned short type; /* interface hardware type */
512 unsigned short hard_header_len; /* hardware hdr length */
514 struct net_device *master; /* Pointer to master device of a group,
515 * which this device is member of.
518 /* Interface address info. */
519 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
520 unsigned char addr_len; /* hardware address length */
521 unsigned short dev_id; /* for shared network cards */
523 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */
524 int uc_count; /* Number of installed ucasts */
526 struct dev_addr_list *mc_list; /* Multicast mac addresses */
527 int mc_count; /* Number of installed mcasts */
532 /* Protocol specific pointers */
534 void *atalk_ptr; /* AppleTalk link */
535 void *ip_ptr; /* IPv4 specific data */
536 void *dn_ptr; /* DECnet specific data */
537 void *ip6_ptr; /* IPv6 specific data */
538 void *ec_ptr; /* Econet specific data */
539 void *ax25_ptr; /* AX.25 specific data */
540 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
541 assign before registering */
544 * Cache line mostly used on receive path (including eth_type_trans())
546 unsigned long last_rx; /* Time of last Rx */
547 /* Interface address info used in eth_type_trans() */
548 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
549 because most packets are unicast) */
551 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
554 * Cache line mostly used on queue transmit path (qdisc)
556 /* device queue lock */
557 spinlock_t queue_lock ____cacheline_aligned_in_smp;
559 struct Qdisc *qdisc_sleeping;
560 struct list_head qdisc_list;
561 unsigned long tx_queue_len; /* Max frames per queue allowed */
563 /* Partially transmitted GSO packet. */
564 struct sk_buff *gso_skb;
566 /* ingress path synchronizer */
567 spinlock_t ingress_lock;
568 struct Qdisc *qdisc_ingress;
571 * One part is mostly used on xmit path (device)
573 /* hard_start_xmit synchronizer */
574 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
575 /* cpu id of processor entered to hard_start_xmit or -1,
576 if nobody entered there.
579 void *priv; /* pointer to private data */
580 int (*hard_start_xmit) (struct sk_buff *skb,
581 struct net_device *dev);
582 /* These may be needed for future network-power-down code. */
583 unsigned long trans_start; /* Time (in jiffies) of last Tx */
585 int watchdog_timeo; /* used by dev_watchdog() */
586 struct timer_list watchdog_timer;
589 * refcnt is a very hot point, so align it on SMP
591 /* Number of references to this device */
592 atomic_t refcnt ____cacheline_aligned_in_smp;
594 /* delayed register/unregister */
595 struct list_head todo_list;
596 /* device index hash chain */
597 struct hlist_node index_hlist;
599 struct net_device *link_watch_next;
601 /* register/unregister state machine */
602 enum { NETREG_UNINITIALIZED=0,
603 NETREG_REGISTERED, /* completed register_netdevice */
604 NETREG_UNREGISTERING, /* called unregister_netdevice */
605 NETREG_UNREGISTERED, /* completed unregister todo */
606 NETREG_RELEASED, /* called free_netdev */
609 /* Called after device is detached from network. */
610 void (*uninit)(struct net_device *dev);
611 /* Called after last user reference disappears. */
612 void (*destructor)(struct net_device *dev);
614 /* Pointers to interface service routines. */
615 int (*open)(struct net_device *dev);
616 int (*stop)(struct net_device *dev);
617 #define HAVE_NETDEV_POLL
618 int (*hard_header) (struct sk_buff *skb,
619 struct net_device *dev,
624 int (*rebuild_header)(struct sk_buff *skb);
625 #define HAVE_CHANGE_RX_FLAGS
626 void (*change_rx_flags)(struct net_device *dev,
628 #define HAVE_SET_RX_MODE
629 void (*set_rx_mode)(struct net_device *dev);
630 #define HAVE_MULTICAST
631 void (*set_multicast_list)(struct net_device *dev);
632 #define HAVE_SET_MAC_ADDR
633 int (*set_mac_address)(struct net_device *dev,
635 #define HAVE_PRIVATE_IOCTL
636 int (*do_ioctl)(struct net_device *dev,
637 struct ifreq *ifr, int cmd);
638 #define HAVE_SET_CONFIG
639 int (*set_config)(struct net_device *dev,
641 #define HAVE_HEADER_CACHE
642 int (*hard_header_cache)(struct neighbour *neigh,
643 struct hh_cache *hh);
644 void (*header_cache_update)(struct hh_cache *hh,
645 struct net_device *dev,
646 unsigned char * haddr);
647 #define HAVE_CHANGE_MTU
648 int (*change_mtu)(struct net_device *dev, int new_mtu);
650 #define HAVE_TX_TIMEOUT
651 void (*tx_timeout) (struct net_device *dev);
653 void (*vlan_rx_register)(struct net_device *dev,
654 struct vlan_group *grp);
655 void (*vlan_rx_add_vid)(struct net_device *dev,
657 void (*vlan_rx_kill_vid)(struct net_device *dev,
660 int (*hard_header_parse)(const struct sk_buff *skb,
661 unsigned char *haddr);
662 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
663 #ifdef CONFIG_NETPOLL
664 struct netpoll_info *npinfo;
666 #ifdef CONFIG_NET_POLL_CONTROLLER
667 void (*poll_controller)(struct net_device *dev);
670 /* Network namespace this network device is inside */
674 struct net_bridge_port *br_port;
676 struct macvlan_port *macvlan_port;
678 /* class/net/name entry */
680 /* space for optional statistics and wireless sysfs groups */
681 struct attribute_group *sysfs_groups[3];
683 /* rtnetlink link ops */
684 const struct rtnl_link_ops *rtnl_link_ops;
686 /* The TX queue control structures */
687 unsigned int egress_subqueue_count;
688 struct net_device_subqueue egress_subqueue[1];
690 #define to_net_dev(d) container_of(d, struct net_device, dev)
692 #define NETDEV_ALIGN 32
693 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
696 * netdev_priv - access network device private data
697 * @dev: network device
699 * Get network device private data
701 static inline void *netdev_priv(const struct net_device *dev)
706 /* Set the sysfs physical device reference for the network logical device
707 * if set prior to registration will cause a symlink during initialization.
709 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
711 static inline void netif_napi_add(struct net_device *dev,
712 struct napi_struct *napi,
713 int (*poll)(struct napi_struct *, int),
716 INIT_LIST_HEAD(&napi->poll_list);
718 napi->weight = weight;
719 #ifdef CONFIG_NETPOLL
721 list_add(&napi->dev_list, &dev->napi_list);
722 spin_lock_init(&napi->poll_lock);
723 napi->poll_owner = -1;
725 set_bit(NAPI_STATE_SCHED, &napi->state);
729 __be16 type; /* This is really htons(ether_type). */
730 struct net_device *dev; /* NULL is wildcarded here */
731 int (*func) (struct sk_buff *,
733 struct packet_type *,
734 struct net_device *);
735 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
737 int (*gso_send_check)(struct sk_buff *skb);
738 void *af_packet_priv;
739 struct list_head list;
742 #include <linux/interrupt.h>
743 #include <linux/notifier.h>
745 extern rwlock_t dev_base_lock; /* Device list lock */
748 #define for_each_netdev(net, d) \
749 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
750 #define for_each_netdev_safe(net, d, n) \
751 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
752 #define for_each_netdev_continue(net, d) \
753 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
754 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
756 static inline struct net_device *next_net_device(struct net_device *dev)
758 struct list_head *lh;
762 lh = dev->dev_list.next;
763 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
766 static inline struct net_device *first_net_device(struct net *net)
768 return list_empty(&net->dev_base_head) ? NULL :
769 net_device_entry(net->dev_base_head.next);
772 extern int netdev_boot_setup_check(struct net_device *dev);
773 extern unsigned long netdev_boot_base(const char *prefix, int unit);
774 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
775 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
776 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
777 extern void dev_add_pack(struct packet_type *pt);
778 extern void dev_remove_pack(struct packet_type *pt);
779 extern void __dev_remove_pack(struct packet_type *pt);
781 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags,
782 unsigned short mask);
783 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
784 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
785 extern int dev_alloc_name(struct net_device *dev, const char *name);
786 extern int dev_open(struct net_device *dev);
787 extern int dev_close(struct net_device *dev);
788 extern int dev_queue_xmit(struct sk_buff *skb);
789 extern int register_netdevice(struct net_device *dev);
790 extern void unregister_netdevice(struct net_device *dev);
791 extern void free_netdev(struct net_device *dev);
792 extern void synchronize_net(void);
793 extern int register_netdevice_notifier(struct notifier_block *nb);
794 extern int unregister_netdevice_notifier(struct notifier_block *nb);
795 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
796 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
797 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
798 extern int dev_restart(struct net_device *dev);
799 #ifdef CONFIG_NETPOLL_TRAP
800 extern int netpoll_trap(void);
803 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
805 void *daddr, void *saddr, unsigned len)
807 if (!dev->hard_header)
809 return dev->hard_header(skb, dev, type, daddr, saddr, len);
812 static inline int dev_parse_header(const struct sk_buff *skb,
813 unsigned char *haddr)
815 const struct net_device *dev = skb->dev;
817 if (!dev->hard_header_parse)
819 return dev->hard_header_parse(skb, haddr);
822 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
823 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
824 static inline int unregister_gifconf(unsigned int family)
826 return register_gifconf(family, NULL);
830 * Incoming packets are placed on per-cpu queues so that
831 * no locking is needed.
835 struct net_device *output_queue;
836 struct sk_buff_head input_pkt_queue;
837 struct list_head poll_list;
838 struct sk_buff *completion_queue;
840 struct napi_struct backlog;
841 #ifdef CONFIG_NET_DMA
842 struct dma_chan *net_dma;
846 DECLARE_PER_CPU(struct softnet_data,softnet_data);
848 #define HAVE_NETIF_QUEUE
850 extern void __netif_schedule(struct net_device *dev);
852 static inline void netif_schedule(struct net_device *dev)
854 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
855 __netif_schedule(dev);
859 * netif_start_queue - allow transmit
860 * @dev: network device
862 * Allow upper layers to call the device hard_start_xmit routine.
864 static inline void netif_start_queue(struct net_device *dev)
866 clear_bit(__LINK_STATE_XOFF, &dev->state);
870 * netif_wake_queue - restart transmit
871 * @dev: network device
873 * Allow upper layers to call the device hard_start_xmit routine.
874 * Used for flow control when transmit resources are available.
876 static inline void netif_wake_queue(struct net_device *dev)
878 #ifdef CONFIG_NETPOLL_TRAP
879 if (netpoll_trap()) {
880 clear_bit(__LINK_STATE_XOFF, &dev->state);
884 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
885 __netif_schedule(dev);
889 * netif_stop_queue - stop transmitted packets
890 * @dev: network device
892 * Stop upper layers calling the device hard_start_xmit routine.
893 * Used for flow control when transmit resources are unavailable.
895 static inline void netif_stop_queue(struct net_device *dev)
897 set_bit(__LINK_STATE_XOFF, &dev->state);
901 * netif_queue_stopped - test if transmit queue is flowblocked
902 * @dev: network device
904 * Test if transmit queue on device is currently unable to send.
906 static inline int netif_queue_stopped(const struct net_device *dev)
908 return test_bit(__LINK_STATE_XOFF, &dev->state);
912 * netif_running - test if up
913 * @dev: network device
915 * Test if the device has been brought up.
917 static inline int netif_running(const struct net_device *dev)
919 return test_bit(__LINK_STATE_START, &dev->state);
923 * Routines to manage the subqueues on a device. We only need start
924 * stop, and a check if it's stopped. All other device management is
925 * done at the overall netdevice level.
926 * Also test the device if we're multiqueue.
930 * netif_start_subqueue - allow sending packets on subqueue
931 * @dev: network device
932 * @queue_index: sub queue index
934 * Start individual transmit queue of a device with multiple transmit queues.
936 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
938 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
939 clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
944 * netif_stop_subqueue - stop sending packets on subqueue
945 * @dev: network device
946 * @queue_index: sub queue index
948 * Stop individual transmit queue of a device with multiple transmit queues.
950 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
952 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
953 #ifdef CONFIG_NETPOLL_TRAP
957 set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
962 * netif_subqueue_stopped - test status of subqueue
963 * @dev: network device
964 * @queue_index: sub queue index
966 * Check individual transmit queue of a device with multiple transmit queues.
968 static inline int netif_subqueue_stopped(const struct net_device *dev,
971 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
972 return test_bit(__LINK_STATE_XOFF,
973 &dev->egress_subqueue[queue_index].state);
981 * netif_wake_subqueue - allow sending packets on subqueue
982 * @dev: network device
983 * @queue_index: sub queue index
985 * Resume individual transmit queue of a device with multiple transmit queues.
987 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
989 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
990 #ifdef CONFIG_NETPOLL_TRAP
994 if (test_and_clear_bit(__LINK_STATE_XOFF,
995 &dev->egress_subqueue[queue_index].state))
996 __netif_schedule(dev);
1001 * netif_is_multiqueue - test if device has multiple transmit queues
1002 * @dev: network device
1004 * Check if device has multiple transmit queues
1005 * Always falls if NETDEVICE_MULTIQUEUE is not configured
1007 static inline int netif_is_multiqueue(const struct net_device *dev)
1009 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1010 return (!!(NETIF_F_MULTI_QUEUE & dev->features));
1016 /* Use this variant when it is known for sure that it
1017 * is executing from interrupt context.
1019 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1021 /* Use this variant in places where it could be invoked
1022 * either from interrupt or non-interrupt context.
1024 extern void dev_kfree_skb_any(struct sk_buff *skb);
1026 #define HAVE_NETIF_RX 1
1027 extern int netif_rx(struct sk_buff *skb);
1028 extern int netif_rx_ni(struct sk_buff *skb);
1029 #define HAVE_NETIF_RECEIVE_SKB 1
1030 extern int netif_receive_skb(struct sk_buff *skb);
1031 extern int dev_valid_name(const char *name);
1032 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1033 extern int dev_ethtool(struct net *net, struct ifreq *);
1034 extern unsigned dev_get_flags(const struct net_device *);
1035 extern int dev_change_flags(struct net_device *, unsigned);
1036 extern int dev_change_name(struct net_device *, char *);
1037 extern int dev_change_net_namespace(struct net_device *,
1038 struct net *, const char *);
1039 extern int dev_set_mtu(struct net_device *, int);
1040 extern int dev_set_mac_address(struct net_device *,
1042 extern int dev_hard_start_xmit(struct sk_buff *skb,
1043 struct net_device *dev);
1045 extern int netdev_budget;
1047 /* Called by rtnetlink.c:rtnl_unlock() */
1048 extern void netdev_run_todo(void);
1051 * dev_put - release reference to device
1052 * @dev: network device
1054 * Hold reference to device to keep it from being freed.
1056 static inline void dev_put(struct net_device *dev)
1058 atomic_dec(&dev->refcnt);
1062 * dev_hold - get reference to device
1063 * @dev: network device
1065 * Release reference to device to allow it to be freed.
1067 static inline void dev_hold(struct net_device *dev)
1069 atomic_inc(&dev->refcnt);
1072 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1073 * and _off may be called from IRQ context, but it is caller
1074 * who is responsible for serialization of these calls.
1076 * The name carrier is inappropriate, these functions should really be
1077 * called netif_lowerlayer_*() because they represent the state of any
1078 * kind of lower layer not just hardware media.
1081 extern void linkwatch_fire_event(struct net_device *dev);
1084 * netif_carrier_ok - test if carrier present
1085 * @dev: network device
1087 * Check if carrier is present on device
1089 static inline int netif_carrier_ok(const struct net_device *dev)
1091 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1094 extern void __netdev_watchdog_up(struct net_device *dev);
1096 extern void netif_carrier_on(struct net_device *dev);
1098 extern void netif_carrier_off(struct net_device *dev);
1101 * netif_dormant_on - mark device as dormant.
1102 * @dev: network device
1104 * Mark device as dormant (as per RFC2863).
1106 * The dormant state indicates that the relevant interface is not
1107 * actually in a condition to pass packets (i.e., it is not 'up') but is
1108 * in a "pending" state, waiting for some external event. For "on-
1109 * demand" interfaces, this new state identifies the situation where the
1110 * interface is waiting for events to place it in the up state.
1113 static inline void netif_dormant_on(struct net_device *dev)
1115 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1116 linkwatch_fire_event(dev);
1120 * netif_dormant_off - set device as not dormant.
1121 * @dev: network device
1123 * Device is not in dormant state.
1125 static inline void netif_dormant_off(struct net_device *dev)
1127 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1128 linkwatch_fire_event(dev);
1132 * netif_dormant - test if carrier present
1133 * @dev: network device
1135 * Check if carrier is present on device
1137 static inline int netif_dormant(const struct net_device *dev)
1139 return test_bit(__LINK_STATE_DORMANT, &dev->state);
1144 * netif_oper_up - test if device is operational
1145 * @dev: network device
1147 * Check if carrier is operational
1149 static inline int netif_oper_up(const struct net_device *dev) {
1150 return (dev->operstate == IF_OPER_UP ||
1151 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1155 * netif_device_present - is device available or removed
1156 * @dev: network device
1158 * Check if device has not been removed from system.
1160 static inline int netif_device_present(struct net_device *dev)
1162 return test_bit(__LINK_STATE_PRESENT, &dev->state);
1165 extern void netif_device_detach(struct net_device *dev);
1167 extern void netif_device_attach(struct net_device *dev);
1170 * Network interface message level settings
1172 #define HAVE_NETIF_MSG 1
1175 NETIF_MSG_DRV = 0x0001,
1176 NETIF_MSG_PROBE = 0x0002,
1177 NETIF_MSG_LINK = 0x0004,
1178 NETIF_MSG_TIMER = 0x0008,
1179 NETIF_MSG_IFDOWN = 0x0010,
1180 NETIF_MSG_IFUP = 0x0020,
1181 NETIF_MSG_RX_ERR = 0x0040,
1182 NETIF_MSG_TX_ERR = 0x0080,
1183 NETIF_MSG_TX_QUEUED = 0x0100,
1184 NETIF_MSG_INTR = 0x0200,
1185 NETIF_MSG_TX_DONE = 0x0400,
1186 NETIF_MSG_RX_STATUS = 0x0800,
1187 NETIF_MSG_PKTDATA = 0x1000,
1188 NETIF_MSG_HW = 0x2000,
1189 NETIF_MSG_WOL = 0x4000,
1192 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
1193 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
1194 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
1195 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
1196 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
1197 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
1198 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
1199 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
1200 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1201 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
1202 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
1203 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1204 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
1205 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
1206 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
1208 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1211 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1212 return default_msg_enable_bits;
1213 if (debug_value == 0) /* no output */
1215 /* set low N bits */
1216 return (1 << debug_value) - 1;
1219 /* Test if receive needs to be scheduled but only if up */
1220 static inline int netif_rx_schedule_prep(struct net_device *dev,
1221 struct napi_struct *napi)
1223 return netif_running(dev) && napi_schedule_prep(napi);
1226 /* Add interface to tail of rx poll list. This assumes that _prep has
1227 * already been called and returned 1.
1229 static inline void __netif_rx_schedule(struct net_device *dev,
1230 struct napi_struct *napi)
1233 __napi_schedule(napi);
1236 /* Try to reschedule poll. Called by irq handler. */
1238 static inline void netif_rx_schedule(struct net_device *dev,
1239 struct napi_struct *napi)
1241 if (netif_rx_schedule_prep(dev, napi))
1242 __netif_rx_schedule(dev, napi);
1245 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */
1246 static inline int netif_rx_reschedule(struct net_device *dev,
1247 struct napi_struct *napi)
1249 if (napi_schedule_prep(napi)) {
1250 __netif_rx_schedule(dev, napi);
1256 /* same as netif_rx_complete, except that local_irq_save(flags)
1257 * has already been issued
1259 static inline void __netif_rx_complete(struct net_device *dev,
1260 struct napi_struct *napi)
1262 __napi_complete(napi);
1266 /* Remove interface from poll list: it must be in the poll list
1267 * on current cpu. This primitive is called by dev->poll(), when
1268 * it completes the work. The device cannot be out of poll list at this
1269 * moment, it is BUG().
1271 static inline void netif_rx_complete(struct net_device *dev,
1272 struct napi_struct *napi)
1274 unsigned long flags;
1276 local_irq_save(flags);
1277 __netif_rx_complete(dev, napi);
1278 local_irq_restore(flags);
1282 * netif_tx_lock - grab network device transmit lock
1283 * @dev: network device
1285 * Get network device transmit lock
1287 static inline void __netif_tx_lock(struct net_device *dev, int cpu)
1289 spin_lock(&dev->_xmit_lock);
1290 dev->xmit_lock_owner = cpu;
1293 static inline void netif_tx_lock(struct net_device *dev)
1295 __netif_tx_lock(dev, smp_processor_id());
1298 static inline void netif_tx_lock_bh(struct net_device *dev)
1300 spin_lock_bh(&dev->_xmit_lock);
1301 dev->xmit_lock_owner = smp_processor_id();
1304 static inline int netif_tx_trylock(struct net_device *dev)
1306 int ok = spin_trylock(&dev->_xmit_lock);
1308 dev->xmit_lock_owner = smp_processor_id();
1312 static inline void netif_tx_unlock(struct net_device *dev)
1314 dev->xmit_lock_owner = -1;
1315 spin_unlock(&dev->_xmit_lock);
1318 static inline void netif_tx_unlock_bh(struct net_device *dev)
1320 dev->xmit_lock_owner = -1;
1321 spin_unlock_bh(&dev->_xmit_lock);
1324 #define HARD_TX_LOCK(dev, cpu) { \
1325 if ((dev->features & NETIF_F_LLTX) == 0) { \
1326 __netif_tx_lock(dev, cpu); \
1330 #define HARD_TX_UNLOCK(dev) { \
1331 if ((dev->features & NETIF_F_LLTX) == 0) { \
1332 netif_tx_unlock(dev); \
1336 static inline void netif_tx_disable(struct net_device *dev)
1338 netif_tx_lock_bh(dev);
1339 netif_stop_queue(dev);
1340 netif_tx_unlock_bh(dev);
1343 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1345 extern void ether_setup(struct net_device *dev);
1347 /* Support for loadable net-drivers */
1348 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1349 void (*setup)(struct net_device *),
1350 unsigned int queue_count);
1351 #define alloc_netdev(sizeof_priv, name, setup) \
1352 alloc_netdev_mq(sizeof_priv, name, setup, 1)
1353 extern int register_netdev(struct net_device *dev);
1354 extern void unregister_netdev(struct net_device *dev);
1355 /* Functions used for secondary unicast and multicast support */
1356 extern void dev_set_rx_mode(struct net_device *dev);
1357 extern void __dev_set_rx_mode(struct net_device *dev);
1358 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1359 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen);
1360 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1361 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1362 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
1363 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
1364 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1365 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1366 extern void dev_set_promiscuity(struct net_device *dev, int inc);
1367 extern void dev_set_allmulti(struct net_device *dev, int inc);
1368 extern void netdev_state_change(struct net_device *dev);
1369 extern void netdev_features_change(struct net_device *dev);
1370 /* Load a device via the kmod */
1371 extern void dev_load(struct net *net, const char *name);
1372 extern void dev_mcast_init(void);
1373 extern int netdev_max_backlog;
1374 extern int weight_p;
1375 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1376 extern int skb_checksum_help(struct sk_buff *skb);
1377 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1379 extern void netdev_rx_csum_fault(struct net_device *dev);
1381 static inline void netdev_rx_csum_fault(struct net_device *dev)
1385 /* rx skb timestamps */
1386 extern void net_enable_timestamp(void);
1387 extern void net_disable_timestamp(void);
1389 #ifdef CONFIG_PROC_FS
1390 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1391 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1392 extern void dev_seq_stop(struct seq_file *seq, void *v);
1395 extern void linkwatch_run_queue(void);
1397 extern int netdev_compute_features(unsigned long all, unsigned long one);
1399 static inline int net_gso_ok(int features, int gso_type)
1401 int feature = gso_type << NETIF_F_GSO_SHIFT;
1402 return (features & feature) == feature;
1405 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1407 return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1410 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1412 return skb_is_gso(skb) &&
1413 (!skb_gso_ok(skb, dev->features) ||
1414 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1417 /* On bonding slaves other than the currently active slave, suppress
1418 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1419 * ARP on active-backup slaves with arp_validate enabled.
1421 static inline int skb_bond_should_drop(struct sk_buff *skb)
1423 struct net_device *dev = skb->dev;
1424 struct net_device *master = dev->master;
1427 (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1428 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1429 skb->protocol == __constant_htons(ETH_P_ARP))
1432 if (master->priv_flags & IFF_MASTER_ALB) {
1433 if (skb->pkt_type != PACKET_BROADCAST &&
1434 skb->pkt_type != PACKET_MULTICAST)
1437 if (master->priv_flags & IFF_MASTER_8023AD &&
1438 skb->protocol == __constant_htons(ETH_P_SLOW))
1446 #endif /* __KERNEL__ */
1448 #endif /* _LINUX_DEV_H */