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)
254 int (*create) (struct sk_buff *skb, struct net_device *dev,
255 unsigned short type, const void *daddr,
256 const void *saddr, unsigned len);
257 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
258 int (*rebuild)(struct sk_buff *skb);
259 #define HAVE_HEADER_CACHE
260 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
261 void (*cache_update)(struct hh_cache *hh,
262 const struct net_device *dev,
263 const unsigned char *haddr);
266 /* These flag bits are private to the generic network queueing
267 * layer, they may not be explicitly referenced by any other
275 __LINK_STATE_PRESENT,
277 __LINK_STATE_NOCARRIER,
278 __LINK_STATE_LINKWATCH_PENDING,
279 __LINK_STATE_DORMANT,
280 __LINK_STATE_QDISC_RUNNING,
285 * This structure holds at boot time configured netdevice settings. They
286 * are then used in the device probing.
288 struct netdev_boot_setup {
292 #define NETDEV_BOOT_SETUP_MAX 8
294 extern int __init netdev_boot_setup(char *str);
297 * Structure for NAPI scheduling similar to tasklet but with weighting
300 /* The poll_list must only be managed by the entity which
301 * changes the state of the NAPI_STATE_SCHED bit. This means
302 * whoever atomically sets that bit can add this napi_struct
303 * to the per-cpu poll_list, and whoever clears that bit
304 * can remove from the list right before clearing the bit.
306 struct list_head poll_list;
310 int (*poll)(struct napi_struct *, int);
311 #ifdef CONFIG_NETPOLL
312 spinlock_t poll_lock;
314 struct net_device *dev;
315 struct list_head dev_list;
321 NAPI_STATE_SCHED, /* Poll is scheduled */
324 extern void FASTCALL(__napi_schedule(struct napi_struct *n));
327 * napi_schedule_prep - check if napi can be scheduled
330 * Test if NAPI routine is already running, and if not mark
331 * it as running. This is used as a condition variable
332 * insure only one NAPI poll instance runs
334 static inline int napi_schedule_prep(struct napi_struct *n)
336 return !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
340 * napi_schedule - schedule NAPI poll
343 * Schedule NAPI poll routine to be called if it is not already
346 static inline void napi_schedule(struct napi_struct *n)
348 if (napi_schedule_prep(n))
353 * napi_complete - NAPI processing complete
356 * Mark NAPI processing as complete.
358 static inline void __napi_complete(struct napi_struct *n)
360 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
361 list_del(&n->poll_list);
362 smp_mb__before_clear_bit();
363 clear_bit(NAPI_STATE_SCHED, &n->state);
366 static inline void napi_complete(struct napi_struct *n)
374 * napi_disable - prevent NAPI from scheduling
377 * Stop NAPI from being scheduled on this context.
378 * Waits till any outstanding processing completes.
380 static inline void napi_disable(struct napi_struct *n)
382 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
383 msleep_interruptible(1);
387 * napi_enable - enable NAPI scheduling
390 * Resume NAPI from being scheduled on this context.
391 * Must be paired with napi_disable.
393 static inline void napi_enable(struct napi_struct *n)
395 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
396 smp_mb__before_clear_bit();
397 clear_bit(NAPI_STATE_SCHED, &n->state);
401 * The DEVICE structure.
402 * Actually, this whole structure is a big mistake. It mixes I/O
403 * data with strictly "high-level" data, and it has to know about
404 * almost every data structure used in the INET module.
406 * FIXME: cleanup struct net_device such that network protocol info
414 * This is the first field of the "visible" part of this structure
415 * (i.e. as seen by users in the "Space.c" file). It is the name
419 /* device name hash chain */
420 struct hlist_node name_hlist;
423 * I/O specific fields
424 * FIXME: Merge these and struct ifmap into one
426 unsigned long mem_end; /* shared mem end */
427 unsigned long mem_start; /* shared mem start */
428 unsigned long base_addr; /* device I/O address */
429 unsigned int irq; /* device IRQ number */
432 * Some hardware also needs these fields, but they are not
433 * part of the usual set specified in Space.c.
436 unsigned char if_port; /* Selectable AUI, TP,..*/
437 unsigned char dma; /* DMA channel */
441 struct list_head dev_list;
442 #ifdef CONFIG_NETPOLL
443 struct list_head napi_list;
446 /* The device initialization function. Called only once. */
447 int (*init)(struct net_device *dev);
449 /* ------- Fields preinitialized in Space.c finish here ------- */
451 /* Net device features */
452 unsigned long features;
453 #define NETIF_F_SG 1 /* Scatter/gather IO. */
454 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
455 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
456 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
457 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
458 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
459 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
460 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
461 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
462 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
463 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
464 #define NETIF_F_GSO 2048 /* Enable software GSO. */
465 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
466 /* do not use LLTX in new drivers */
467 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
468 #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */
469 #define NETIF_F_LRO 32768 /* large receive offload */
471 /* Segmentation offload features */
472 #define NETIF_F_GSO_SHIFT 16
473 #define NETIF_F_GSO_MASK 0xffff0000
474 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
475 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
476 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
477 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
478 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
480 /* List of features with software fallbacks. */
481 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
484 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
485 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
486 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
487 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
489 struct net_device *next_sched;
491 /* Interface index. Unique device identifier */
496 struct net_device_stats* (*get_stats)(struct net_device *dev);
497 struct net_device_stats stats;
499 #ifdef CONFIG_WIRELESS_EXT
500 /* List of functions to handle Wireless Extensions (instead of ioctl).
501 * See <net/iw_handler.h> for details. Jean II */
502 const struct iw_handler_def * wireless_handlers;
503 /* Instance data managed by the core of Wireless Extensions. */
504 struct iw_public_data * wireless_data;
506 const struct ethtool_ops *ethtool_ops;
508 /* Hardware header description */
509 const struct header_ops *header_ops;
512 * This marks the end of the "visible" part of the structure. All
513 * fields hereafter are internal to the system, and may change at
514 * will (read: may be cleaned up at will).
518 unsigned int flags; /* interface flags (a la BSD) */
519 unsigned short gflags;
520 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
521 unsigned short padded; /* How much padding added by alloc_netdev() */
523 unsigned char operstate; /* RFC2863 operstate */
524 unsigned char link_mode; /* mapping policy to operstate */
526 unsigned mtu; /* interface MTU value */
527 unsigned short type; /* interface hardware type */
528 unsigned short hard_header_len; /* hardware hdr length */
530 struct net_device *master; /* Pointer to master device of a group,
531 * which this device is member of.
534 /* Interface address info. */
535 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
536 unsigned char addr_len; /* hardware address length */
537 unsigned short dev_id; /* for shared network cards */
539 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */
540 int uc_count; /* Number of installed ucasts */
542 struct dev_addr_list *mc_list; /* Multicast mac addresses */
543 int mc_count; /* Number of installed mcasts */
548 /* Protocol specific pointers */
550 void *atalk_ptr; /* AppleTalk link */
551 void *ip_ptr; /* IPv4 specific data */
552 void *dn_ptr; /* DECnet specific data */
553 void *ip6_ptr; /* IPv6 specific data */
554 void *ec_ptr; /* Econet specific data */
555 void *ax25_ptr; /* AX.25 specific data */
556 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
557 assign before registering */
560 * Cache line mostly used on receive path (including eth_type_trans())
562 unsigned long last_rx; /* Time of last Rx */
563 /* Interface address info used in eth_type_trans() */
564 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
565 because most packets are unicast) */
567 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
570 * Cache line mostly used on queue transmit path (qdisc)
572 /* device queue lock */
573 spinlock_t queue_lock ____cacheline_aligned_in_smp;
575 struct Qdisc *qdisc_sleeping;
576 struct list_head qdisc_list;
577 unsigned long tx_queue_len; /* Max frames per queue allowed */
579 /* Partially transmitted GSO packet. */
580 struct sk_buff *gso_skb;
582 /* ingress path synchronizer */
583 spinlock_t ingress_lock;
584 struct Qdisc *qdisc_ingress;
587 * One part is mostly used on xmit path (device)
589 /* hard_start_xmit synchronizer */
590 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
591 /* cpu id of processor entered to hard_start_xmit or -1,
592 if nobody entered there.
595 void *priv; /* pointer to private data */
596 int (*hard_start_xmit) (struct sk_buff *skb,
597 struct net_device *dev);
598 /* These may be needed for future network-power-down code. */
599 unsigned long trans_start; /* Time (in jiffies) of last Tx */
601 int watchdog_timeo; /* used by dev_watchdog() */
602 struct timer_list watchdog_timer;
605 * refcnt is a very hot point, so align it on SMP
607 /* Number of references to this device */
608 atomic_t refcnt ____cacheline_aligned_in_smp;
610 /* delayed register/unregister */
611 struct list_head todo_list;
612 /* device index hash chain */
613 struct hlist_node index_hlist;
615 struct net_device *link_watch_next;
617 /* register/unregister state machine */
618 enum { NETREG_UNINITIALIZED=0,
619 NETREG_REGISTERED, /* completed register_netdevice */
620 NETREG_UNREGISTERING, /* called unregister_netdevice */
621 NETREG_UNREGISTERED, /* completed unregister todo */
622 NETREG_RELEASED, /* called free_netdev */
625 /* Called after device is detached from network. */
626 void (*uninit)(struct net_device *dev);
627 /* Called after last user reference disappears. */
628 void (*destructor)(struct net_device *dev);
630 /* Pointers to interface service routines. */
631 int (*open)(struct net_device *dev);
632 int (*stop)(struct net_device *dev);
633 #define HAVE_NETDEV_POLL
634 #define HAVE_CHANGE_RX_FLAGS
635 void (*change_rx_flags)(struct net_device *dev,
637 #define HAVE_SET_RX_MODE
638 void (*set_rx_mode)(struct net_device *dev);
639 #define HAVE_MULTICAST
640 void (*set_multicast_list)(struct net_device *dev);
641 #define HAVE_SET_MAC_ADDR
642 int (*set_mac_address)(struct net_device *dev,
644 #define HAVE_PRIVATE_IOCTL
645 int (*do_ioctl)(struct net_device *dev,
646 struct ifreq *ifr, int cmd);
647 #define HAVE_SET_CONFIG
648 int (*set_config)(struct net_device *dev,
650 #define HAVE_CHANGE_MTU
651 int (*change_mtu)(struct net_device *dev, int new_mtu);
653 #define HAVE_TX_TIMEOUT
654 void (*tx_timeout) (struct net_device *dev);
656 void (*vlan_rx_register)(struct net_device *dev,
657 struct vlan_group *grp);
658 void (*vlan_rx_add_vid)(struct net_device *dev,
660 void (*vlan_rx_kill_vid)(struct net_device *dev,
663 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
664 #ifdef CONFIG_NETPOLL
665 struct netpoll_info *npinfo;
667 #ifdef CONFIG_NET_POLL_CONTROLLER
668 void (*poll_controller)(struct net_device *dev);
671 /* Network namespace this network device is inside */
675 struct net_bridge_port *br_port;
677 struct macvlan_port *macvlan_port;
679 /* class/net/name entry */
681 /* space for optional statistics and wireless sysfs groups */
682 struct attribute_group *sysfs_groups[3];
684 /* rtnetlink link ops */
685 const struct rtnl_link_ops *rtnl_link_ops;
687 /* The TX queue control structures */
688 unsigned int egress_subqueue_count;
689 struct net_device_subqueue egress_subqueue[1];
691 #define to_net_dev(d) container_of(d, struct net_device, dev)
693 #define NETDEV_ALIGN 32
694 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
697 * netdev_priv - access network device private data
698 * @dev: network device
700 * Get network device private data
702 static inline void *netdev_priv(const struct net_device *dev)
707 /* Set the sysfs physical device reference for the network logical device
708 * if set prior to registration will cause a symlink during initialization.
710 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
712 static inline void netif_napi_add(struct net_device *dev,
713 struct napi_struct *napi,
714 int (*poll)(struct napi_struct *, int),
717 INIT_LIST_HEAD(&napi->poll_list);
719 napi->weight = weight;
720 #ifdef CONFIG_NETPOLL
722 list_add(&napi->dev_list, &dev->napi_list);
723 spin_lock_init(&napi->poll_lock);
724 napi->poll_owner = -1;
726 set_bit(NAPI_STATE_SCHED, &napi->state);
730 __be16 type; /* This is really htons(ether_type). */
731 struct net_device *dev; /* NULL is wildcarded here */
732 int (*func) (struct sk_buff *,
734 struct packet_type *,
735 struct net_device *);
736 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
738 int (*gso_send_check)(struct sk_buff *skb);
739 void *af_packet_priv;
740 struct list_head list;
743 #include <linux/interrupt.h>
744 #include <linux/notifier.h>
746 extern rwlock_t dev_base_lock; /* Device list lock */
749 #define for_each_netdev(net, d) \
750 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
751 #define for_each_netdev_safe(net, d, n) \
752 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
753 #define for_each_netdev_continue(net, d) \
754 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
755 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
757 static inline struct net_device *next_net_device(struct net_device *dev)
759 struct list_head *lh;
763 lh = dev->dev_list.next;
764 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
767 static inline struct net_device *first_net_device(struct net *net)
769 return list_empty(&net->dev_base_head) ? NULL :
770 net_device_entry(net->dev_base_head.next);
773 extern int netdev_boot_setup_check(struct net_device *dev);
774 extern unsigned long netdev_boot_base(const char *prefix, int unit);
775 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
776 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
777 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
778 extern void dev_add_pack(struct packet_type *pt);
779 extern void dev_remove_pack(struct packet_type *pt);
780 extern void __dev_remove_pack(struct packet_type *pt);
782 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags,
783 unsigned short mask);
784 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
785 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
786 extern int dev_alloc_name(struct net_device *dev, const char *name);
787 extern int dev_open(struct net_device *dev);
788 extern int dev_close(struct net_device *dev);
789 extern int dev_queue_xmit(struct sk_buff *skb);
790 extern int register_netdevice(struct net_device *dev);
791 extern void unregister_netdevice(struct net_device *dev);
792 extern void free_netdev(struct net_device *dev);
793 extern void synchronize_net(void);
794 extern int register_netdevice_notifier(struct notifier_block *nb);
795 extern int unregister_netdevice_notifier(struct notifier_block *nb);
796 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
797 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
798 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
799 extern int dev_restart(struct net_device *dev);
800 #ifdef CONFIG_NETPOLL_TRAP
801 extern int netpoll_trap(void);
804 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
806 const void *daddr, const void *saddr,
809 if (!dev->header_ops)
812 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
815 static inline int dev_parse_header(const struct sk_buff *skb,
816 unsigned char *haddr)
818 const struct net_device *dev = skb->dev;
820 if (!dev->header_ops->parse)
822 return dev->header_ops->parse(skb, haddr);
825 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
826 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
827 static inline int unregister_gifconf(unsigned int family)
829 return register_gifconf(family, NULL);
833 * Incoming packets are placed on per-cpu queues so that
834 * no locking is needed.
838 struct net_device *output_queue;
839 struct sk_buff_head input_pkt_queue;
840 struct list_head poll_list;
841 struct sk_buff *completion_queue;
843 struct napi_struct backlog;
844 #ifdef CONFIG_NET_DMA
845 struct dma_chan *net_dma;
849 DECLARE_PER_CPU(struct softnet_data,softnet_data);
851 #define HAVE_NETIF_QUEUE
853 extern void __netif_schedule(struct net_device *dev);
855 static inline void netif_schedule(struct net_device *dev)
857 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
858 __netif_schedule(dev);
862 * netif_start_queue - allow transmit
863 * @dev: network device
865 * Allow upper layers to call the device hard_start_xmit routine.
867 static inline void netif_start_queue(struct net_device *dev)
869 clear_bit(__LINK_STATE_XOFF, &dev->state);
873 * netif_wake_queue - restart transmit
874 * @dev: network device
876 * Allow upper layers to call the device hard_start_xmit routine.
877 * Used for flow control when transmit resources are available.
879 static inline void netif_wake_queue(struct net_device *dev)
881 #ifdef CONFIG_NETPOLL_TRAP
882 if (netpoll_trap()) {
883 clear_bit(__LINK_STATE_XOFF, &dev->state);
887 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
888 __netif_schedule(dev);
892 * netif_stop_queue - stop transmitted packets
893 * @dev: network device
895 * Stop upper layers calling the device hard_start_xmit routine.
896 * Used for flow control when transmit resources are unavailable.
898 static inline void netif_stop_queue(struct net_device *dev)
900 set_bit(__LINK_STATE_XOFF, &dev->state);
904 * netif_queue_stopped - test if transmit queue is flowblocked
905 * @dev: network device
907 * Test if transmit queue on device is currently unable to send.
909 static inline int netif_queue_stopped(const struct net_device *dev)
911 return test_bit(__LINK_STATE_XOFF, &dev->state);
915 * netif_running - test if up
916 * @dev: network device
918 * Test if the device has been brought up.
920 static inline int netif_running(const struct net_device *dev)
922 return test_bit(__LINK_STATE_START, &dev->state);
926 * Routines to manage the subqueues on a device. We only need start
927 * stop, and a check if it's stopped. All other device management is
928 * done at the overall netdevice level.
929 * Also test the device if we're multiqueue.
933 * netif_start_subqueue - allow sending packets on subqueue
934 * @dev: network device
935 * @queue_index: sub queue index
937 * Start individual transmit queue of a device with multiple transmit queues.
939 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
941 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
942 clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
947 * netif_stop_subqueue - stop sending packets on subqueue
948 * @dev: network device
949 * @queue_index: sub queue index
951 * Stop individual transmit queue of a device with multiple transmit queues.
953 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
955 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
956 #ifdef CONFIG_NETPOLL_TRAP
960 set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
965 * netif_subqueue_stopped - test status of subqueue
966 * @dev: network device
967 * @queue_index: sub queue index
969 * Check individual transmit queue of a device with multiple transmit queues.
971 static inline int netif_subqueue_stopped(const struct net_device *dev,
974 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
975 return test_bit(__LINK_STATE_XOFF,
976 &dev->egress_subqueue[queue_index].state);
984 * netif_wake_subqueue - allow sending packets on subqueue
985 * @dev: network device
986 * @queue_index: sub queue index
988 * Resume individual transmit queue of a device with multiple transmit queues.
990 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
992 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
993 #ifdef CONFIG_NETPOLL_TRAP
997 if (test_and_clear_bit(__LINK_STATE_XOFF,
998 &dev->egress_subqueue[queue_index].state))
999 __netif_schedule(dev);
1004 * netif_is_multiqueue - test if device has multiple transmit queues
1005 * @dev: network device
1007 * Check if device has multiple transmit queues
1008 * Always falls if NETDEVICE_MULTIQUEUE is not configured
1010 static inline int netif_is_multiqueue(const struct net_device *dev)
1012 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
1013 return (!!(NETIF_F_MULTI_QUEUE & dev->features));
1019 /* Use this variant when it is known for sure that it
1020 * is executing from interrupt context.
1022 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1024 /* Use this variant in places where it could be invoked
1025 * either from interrupt or non-interrupt context.
1027 extern void dev_kfree_skb_any(struct sk_buff *skb);
1029 #define HAVE_NETIF_RX 1
1030 extern int netif_rx(struct sk_buff *skb);
1031 extern int netif_rx_ni(struct sk_buff *skb);
1032 #define HAVE_NETIF_RECEIVE_SKB 1
1033 extern int netif_receive_skb(struct sk_buff *skb);
1034 extern int dev_valid_name(const char *name);
1035 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1036 extern int dev_ethtool(struct net *net, struct ifreq *);
1037 extern unsigned dev_get_flags(const struct net_device *);
1038 extern int dev_change_flags(struct net_device *, unsigned);
1039 extern int dev_change_name(struct net_device *, char *);
1040 extern int dev_change_net_namespace(struct net_device *,
1041 struct net *, const char *);
1042 extern int dev_set_mtu(struct net_device *, int);
1043 extern int dev_set_mac_address(struct net_device *,
1045 extern int dev_hard_start_xmit(struct sk_buff *skb,
1046 struct net_device *dev);
1048 extern int netdev_budget;
1050 /* Called by rtnetlink.c:rtnl_unlock() */
1051 extern void netdev_run_todo(void);
1054 * dev_put - release reference to device
1055 * @dev: network device
1057 * Hold reference to device to keep it from being freed.
1059 static inline void dev_put(struct net_device *dev)
1061 atomic_dec(&dev->refcnt);
1065 * dev_hold - get reference to device
1066 * @dev: network device
1068 * Release reference to device to allow it to be freed.
1070 static inline void dev_hold(struct net_device *dev)
1072 atomic_inc(&dev->refcnt);
1075 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1076 * and _off may be called from IRQ context, but it is caller
1077 * who is responsible for serialization of these calls.
1079 * The name carrier is inappropriate, these functions should really be
1080 * called netif_lowerlayer_*() because they represent the state of any
1081 * kind of lower layer not just hardware media.
1084 extern void linkwatch_fire_event(struct net_device *dev);
1087 * netif_carrier_ok - test if carrier present
1088 * @dev: network device
1090 * Check if carrier is present on device
1092 static inline int netif_carrier_ok(const struct net_device *dev)
1094 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1097 extern void __netdev_watchdog_up(struct net_device *dev);
1099 extern void netif_carrier_on(struct net_device *dev);
1101 extern void netif_carrier_off(struct net_device *dev);
1104 * netif_dormant_on - mark device as dormant.
1105 * @dev: network device
1107 * Mark device as dormant (as per RFC2863).
1109 * The dormant state indicates that the relevant interface is not
1110 * actually in a condition to pass packets (i.e., it is not 'up') but is
1111 * in a "pending" state, waiting for some external event. For "on-
1112 * demand" interfaces, this new state identifies the situation where the
1113 * interface is waiting for events to place it in the up state.
1116 static inline void netif_dormant_on(struct net_device *dev)
1118 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1119 linkwatch_fire_event(dev);
1123 * netif_dormant_off - set device as not dormant.
1124 * @dev: network device
1126 * Device is not in dormant state.
1128 static inline void netif_dormant_off(struct net_device *dev)
1130 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1131 linkwatch_fire_event(dev);
1135 * netif_dormant - test if carrier present
1136 * @dev: network device
1138 * Check if carrier is present on device
1140 static inline int netif_dormant(const struct net_device *dev)
1142 return test_bit(__LINK_STATE_DORMANT, &dev->state);
1147 * netif_oper_up - test if device is operational
1148 * @dev: network device
1150 * Check if carrier is operational
1152 static inline int netif_oper_up(const struct net_device *dev) {
1153 return (dev->operstate == IF_OPER_UP ||
1154 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1158 * netif_device_present - is device available or removed
1159 * @dev: network device
1161 * Check if device has not been removed from system.
1163 static inline int netif_device_present(struct net_device *dev)
1165 return test_bit(__LINK_STATE_PRESENT, &dev->state);
1168 extern void netif_device_detach(struct net_device *dev);
1170 extern void netif_device_attach(struct net_device *dev);
1173 * Network interface message level settings
1175 #define HAVE_NETIF_MSG 1
1178 NETIF_MSG_DRV = 0x0001,
1179 NETIF_MSG_PROBE = 0x0002,
1180 NETIF_MSG_LINK = 0x0004,
1181 NETIF_MSG_TIMER = 0x0008,
1182 NETIF_MSG_IFDOWN = 0x0010,
1183 NETIF_MSG_IFUP = 0x0020,
1184 NETIF_MSG_RX_ERR = 0x0040,
1185 NETIF_MSG_TX_ERR = 0x0080,
1186 NETIF_MSG_TX_QUEUED = 0x0100,
1187 NETIF_MSG_INTR = 0x0200,
1188 NETIF_MSG_TX_DONE = 0x0400,
1189 NETIF_MSG_RX_STATUS = 0x0800,
1190 NETIF_MSG_PKTDATA = 0x1000,
1191 NETIF_MSG_HW = 0x2000,
1192 NETIF_MSG_WOL = 0x4000,
1195 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
1196 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
1197 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
1198 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
1199 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
1200 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
1201 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
1202 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
1203 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1204 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
1205 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
1206 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1207 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
1208 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
1209 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
1211 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1214 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1215 return default_msg_enable_bits;
1216 if (debug_value == 0) /* no output */
1218 /* set low N bits */
1219 return (1 << debug_value) - 1;
1222 /* Test if receive needs to be scheduled but only if up */
1223 static inline int netif_rx_schedule_prep(struct net_device *dev,
1224 struct napi_struct *napi)
1226 return netif_running(dev) && napi_schedule_prep(napi);
1229 /* Add interface to tail of rx poll list. This assumes that _prep has
1230 * already been called and returned 1.
1232 static inline void __netif_rx_schedule(struct net_device *dev,
1233 struct napi_struct *napi)
1236 __napi_schedule(napi);
1239 /* Try to reschedule poll. Called by irq handler. */
1241 static inline void netif_rx_schedule(struct net_device *dev,
1242 struct napi_struct *napi)
1244 if (netif_rx_schedule_prep(dev, napi))
1245 __netif_rx_schedule(dev, napi);
1248 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */
1249 static inline int netif_rx_reschedule(struct net_device *dev,
1250 struct napi_struct *napi)
1252 if (napi_schedule_prep(napi)) {
1253 __netif_rx_schedule(dev, napi);
1259 /* same as netif_rx_complete, except that local_irq_save(flags)
1260 * has already been issued
1262 static inline void __netif_rx_complete(struct net_device *dev,
1263 struct napi_struct *napi)
1265 __napi_complete(napi);
1269 /* Remove interface from poll list: it must be in the poll list
1270 * on current cpu. This primitive is called by dev->poll(), when
1271 * it completes the work. The device cannot be out of poll list at this
1272 * moment, it is BUG().
1274 static inline void netif_rx_complete(struct net_device *dev,
1275 struct napi_struct *napi)
1277 unsigned long flags;
1279 local_irq_save(flags);
1280 __netif_rx_complete(dev, napi);
1281 local_irq_restore(flags);
1285 * netif_tx_lock - grab network device transmit lock
1286 * @dev: network device
1288 * Get network device transmit lock
1290 static inline void __netif_tx_lock(struct net_device *dev, int cpu)
1292 spin_lock(&dev->_xmit_lock);
1293 dev->xmit_lock_owner = cpu;
1296 static inline void netif_tx_lock(struct net_device *dev)
1298 __netif_tx_lock(dev, smp_processor_id());
1301 static inline void netif_tx_lock_bh(struct net_device *dev)
1303 spin_lock_bh(&dev->_xmit_lock);
1304 dev->xmit_lock_owner = smp_processor_id();
1307 static inline int netif_tx_trylock(struct net_device *dev)
1309 int ok = spin_trylock(&dev->_xmit_lock);
1311 dev->xmit_lock_owner = smp_processor_id();
1315 static inline void netif_tx_unlock(struct net_device *dev)
1317 dev->xmit_lock_owner = -1;
1318 spin_unlock(&dev->_xmit_lock);
1321 static inline void netif_tx_unlock_bh(struct net_device *dev)
1323 dev->xmit_lock_owner = -1;
1324 spin_unlock_bh(&dev->_xmit_lock);
1327 #define HARD_TX_LOCK(dev, cpu) { \
1328 if ((dev->features & NETIF_F_LLTX) == 0) { \
1329 __netif_tx_lock(dev, cpu); \
1333 #define HARD_TX_UNLOCK(dev) { \
1334 if ((dev->features & NETIF_F_LLTX) == 0) { \
1335 netif_tx_unlock(dev); \
1339 static inline void netif_tx_disable(struct net_device *dev)
1341 netif_tx_lock_bh(dev);
1342 netif_stop_queue(dev);
1343 netif_tx_unlock_bh(dev);
1346 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1348 extern void ether_setup(struct net_device *dev);
1350 /* Support for loadable net-drivers */
1351 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1352 void (*setup)(struct net_device *),
1353 unsigned int queue_count);
1354 #define alloc_netdev(sizeof_priv, name, setup) \
1355 alloc_netdev_mq(sizeof_priv, name, setup, 1)
1356 extern int register_netdev(struct net_device *dev);
1357 extern void unregister_netdev(struct net_device *dev);
1358 /* Functions used for secondary unicast and multicast support */
1359 extern void dev_set_rx_mode(struct net_device *dev);
1360 extern void __dev_set_rx_mode(struct net_device *dev);
1361 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen);
1362 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen);
1363 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1364 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1365 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
1366 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
1367 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1368 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1369 extern void dev_set_promiscuity(struct net_device *dev, int inc);
1370 extern void dev_set_allmulti(struct net_device *dev, int inc);
1371 extern void netdev_state_change(struct net_device *dev);
1372 extern void netdev_features_change(struct net_device *dev);
1373 /* Load a device via the kmod */
1374 extern void dev_load(struct net *net, const char *name);
1375 extern void dev_mcast_init(void);
1376 extern int netdev_max_backlog;
1377 extern int weight_p;
1378 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1379 extern int skb_checksum_help(struct sk_buff *skb);
1380 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1382 extern void netdev_rx_csum_fault(struct net_device *dev);
1384 static inline void netdev_rx_csum_fault(struct net_device *dev)
1388 /* rx skb timestamps */
1389 extern void net_enable_timestamp(void);
1390 extern void net_disable_timestamp(void);
1392 #ifdef CONFIG_PROC_FS
1393 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1394 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1395 extern void dev_seq_stop(struct seq_file *seq, void *v);
1398 extern void linkwatch_run_queue(void);
1400 extern int netdev_compute_features(unsigned long all, unsigned long one);
1402 static inline int net_gso_ok(int features, int gso_type)
1404 int feature = gso_type << NETIF_F_GSO_SHIFT;
1405 return (features & feature) == feature;
1408 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1410 return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1413 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1415 return skb_is_gso(skb) &&
1416 (!skb_gso_ok(skb, dev->features) ||
1417 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1420 /* On bonding slaves other than the currently active slave, suppress
1421 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1422 * ARP on active-backup slaves with arp_validate enabled.
1424 static inline int skb_bond_should_drop(struct sk_buff *skb)
1426 struct net_device *dev = skb->dev;
1427 struct net_device *master = dev->master;
1430 (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1431 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1432 skb->protocol == __constant_htons(ETH_P_ARP))
1435 if (master->priv_flags & IFF_MASTER_ALB) {
1436 if (skb->pkt_type != PACKET_BROADCAST &&
1437 skb->pkt_type != PACKET_MULTICAST)
1440 if (master->priv_flags & IFF_MASTER_8023AD &&
1441 skb->protocol == __constant_htons(ETH_P_SLOW))
1449 #endif /* __KERNEL__ */
1451 #endif /* _LINUX_DEV_H */