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 <asm/atomic.h>
35 #include <asm/cache.h>
36 #include <asm/byteorder.h>
38 #include <linux/device.h>
39 #include <linux/percpu.h>
40 #include <linux/dmaengine.h>
47 /* source back-compat hooks */
48 #define SET_ETHTOOL_OPS(netdev,ops) \
49 ( (netdev)->ethtool_ops = (ops) )
51 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
52 functions are available. */
53 #define HAVE_FREE_NETDEV /* free_netdev() */
54 #define HAVE_NETDEV_PRIV /* netdev_priv() */
56 #define NET_XMIT_SUCCESS 0
57 #define NET_XMIT_DROP 1 /* skb dropped */
58 #define NET_XMIT_CN 2 /* congestion notification */
59 #define NET_XMIT_POLICED 3 /* skb is shot by police */
60 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue;
61 (TC use only - dev_queue_xmit
62 returns this as NET_XMIT_SUCCESS) */
64 /* Backlog congestion levels */
65 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
66 #define NET_RX_DROP 1 /* packet dropped */
67 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
68 #define NET_RX_CN_MOD 3 /* Storm on its way! */
69 #define NET_RX_CN_HIGH 4 /* The storm is here */
70 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
72 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
73 * indicates that the device will soon be dropping packets, or already drops
74 * some packets of the same priority; prompting us to send less aggressively. */
75 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e))
76 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
80 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
82 /* Driver transmit return codes */
83 #define NETDEV_TX_OK 0 /* driver took care of packet */
84 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
85 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
88 * Compute the worst case header length according to the protocols
92 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
93 #define LL_MAX_HEADER 32
95 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
96 #define LL_MAX_HEADER 96
98 #define LL_MAX_HEADER 48
102 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
103 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
104 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
105 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
106 #define MAX_HEADER LL_MAX_HEADER
108 #define MAX_HEADER (LL_MAX_HEADER + 48)
112 * Network device statistics. Akin to the 2.0 ether stats but
113 * with byte counters.
116 struct net_device_stats
118 unsigned long rx_packets; /* total packets received */
119 unsigned long tx_packets; /* total packets transmitted */
120 unsigned long rx_bytes; /* total bytes received */
121 unsigned long tx_bytes; /* total bytes transmitted */
122 unsigned long rx_errors; /* bad packets received */
123 unsigned long tx_errors; /* packet transmit problems */
124 unsigned long rx_dropped; /* no space in linux buffers */
125 unsigned long tx_dropped; /* no space available in linux */
126 unsigned long multicast; /* multicast packets received */
127 unsigned long collisions;
129 /* detailed rx_errors: */
130 unsigned long rx_length_errors;
131 unsigned long rx_over_errors; /* receiver ring buff overflow */
132 unsigned long rx_crc_errors; /* recved pkt with crc error */
133 unsigned long rx_frame_errors; /* recv'd frame alignment error */
134 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
135 unsigned long rx_missed_errors; /* receiver missed packet */
137 /* detailed tx_errors */
138 unsigned long tx_aborted_errors;
139 unsigned long tx_carrier_errors;
140 unsigned long tx_fifo_errors;
141 unsigned long tx_heartbeat_errors;
142 unsigned long tx_window_errors;
145 unsigned long rx_compressed;
146 unsigned long tx_compressed;
150 /* Media selection options. */
163 #include <linux/cache.h>
164 #include <linux/skbuff.h>
170 struct netif_rx_stats
174 unsigned time_squeeze;
175 unsigned cpu_collision;
178 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
182 * We tag multicasts with these structures.
187 struct dev_mc_list *next;
188 __u8 dmi_addr[MAX_ADDR_LEN];
189 unsigned char dmi_addrlen;
196 struct hh_cache *hh_next; /* Next entry */
197 atomic_t hh_refcnt; /* number of users */
199 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
201 * They are mostly read, but hh_refcnt may be changed quite frequently,
202 * incurring cache line ping pongs.
204 __be16 hh_type ____cacheline_aligned_in_smp;
205 /* protocol identifier, f.e ETH_P_IP
206 * NOTE: For VLANs, this will be the
207 * encapuslated type. --BLG
209 u16 hh_len; /* length of header */
210 int (*hh_output)(struct sk_buff *skb);
213 /* cached hardware header; allow for machine alignment needs. */
214 #define HH_DATA_MOD 16
215 #define HH_DATA_OFF(__len) \
216 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
217 #define HH_DATA_ALIGN(__len) \
218 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
219 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
222 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
224 * dev->hard_header_len ? (dev->hard_header_len +
225 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
227 * We could use other alignment values, but we must maintain the
228 * relationship HH alignment <= LL alignment.
230 #define LL_RESERVED_SPACE(dev) \
231 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
232 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
233 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
235 /* These flag bits are private to the generic network queueing
236 * layer, they may not be explicitly referenced by any other
244 __LINK_STATE_PRESENT,
246 __LINK_STATE_NOCARRIER,
247 __LINK_STATE_RX_SCHED,
248 __LINK_STATE_LINKWATCH_PENDING,
249 __LINK_STATE_DORMANT,
250 __LINK_STATE_QDISC_RUNNING,
255 * This structure holds at boot time configured netdevice settings. They
256 * are then used in the device probing.
258 struct netdev_boot_setup {
262 #define NETDEV_BOOT_SETUP_MAX 8
264 extern int __init netdev_boot_setup(char *str);
267 * The DEVICE structure.
268 * Actually, this whole structure is a big mistake. It mixes I/O
269 * data with strictly "high-level" data, and it has to know about
270 * almost every data structure used in the INET module.
272 * FIXME: cleanup struct net_device such that network protocol info
280 * This is the first field of the "visible" part of this structure
281 * (i.e. as seen by users in the "Space.c" file). It is the name
285 /* device name hash chain */
286 struct hlist_node name_hlist;
289 * I/O specific fields
290 * FIXME: Merge these and struct ifmap into one
292 unsigned long mem_end; /* shared mem end */
293 unsigned long mem_start; /* shared mem start */
294 unsigned long base_addr; /* device I/O address */
295 unsigned int irq; /* device IRQ number */
298 * Some hardware also needs these fields, but they are not
299 * part of the usual set specified in Space.c.
302 unsigned char if_port; /* Selectable AUI, TP,..*/
303 unsigned char dma; /* DMA channel */
307 struct list_head dev_list;
309 /* The device initialization function. Called only once. */
310 int (*init)(struct net_device *dev);
312 /* ------- Fields preinitialized in Space.c finish here ------- */
314 /* Net device features */
315 unsigned long features;
316 #define NETIF_F_SG 1 /* Scatter/gather IO. */
317 #define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
318 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
319 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
320 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
321 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
322 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
323 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
324 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
325 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
326 #define NETIF_F_GSO 2048 /* Enable software GSO. */
327 #define NETIF_F_LLTX 4096 /* LockLess TX */
329 /* Segmentation offload features */
330 #define NETIF_F_GSO_SHIFT 16
331 #define NETIF_F_GSO_MASK 0xffff0000
332 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
333 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
334 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
335 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
336 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
338 /* List of features with software fallbacks. */
339 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
341 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
342 #define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
344 struct net_device *next_sched;
346 /* Interface index. Unique device identifier */
351 struct net_device_stats* (*get_stats)(struct net_device *dev);
352 struct net_device_stats stats;
354 #ifdef CONFIG_WIRELESS_EXT
355 /* List of functions to handle Wireless Extensions (instead of ioctl).
356 * See <net/iw_handler.h> for details. Jean II */
357 const struct iw_handler_def * wireless_handlers;
358 /* Instance data managed by the core of Wireless Extensions. */
359 struct iw_public_data * wireless_data;
361 const struct ethtool_ops *ethtool_ops;
364 * This marks the end of the "visible" part of the structure. All
365 * fields hereafter are internal to the system, and may change at
366 * will (read: may be cleaned up at will).
370 unsigned int flags; /* interface flags (a la BSD) */
371 unsigned short gflags;
372 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
373 unsigned short padded; /* How much padding added by alloc_netdev() */
375 unsigned char operstate; /* RFC2863 operstate */
376 unsigned char link_mode; /* mapping policy to operstate */
378 unsigned mtu; /* interface MTU value */
379 unsigned short type; /* interface hardware type */
380 unsigned short hard_header_len; /* hardware hdr length */
382 struct net_device *master; /* Pointer to master device of a group,
383 * which this device is member of.
386 /* Interface address info. */
387 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
388 unsigned char addr_len; /* hardware address length */
389 unsigned short dev_id; /* for shared network cards */
391 struct dev_mc_list *mc_list; /* Multicast mac addresses */
392 int mc_count; /* Number of installed mcasts */
397 /* Protocol specific pointers */
399 void *atalk_ptr; /* AppleTalk link */
400 void *ip_ptr; /* IPv4 specific data */
401 void *dn_ptr; /* DECnet specific data */
402 void *ip6_ptr; /* IPv6 specific data */
403 void *ec_ptr; /* Econet specific data */
404 void *ax25_ptr; /* AX.25 specific data */
405 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
406 assign before registering */
409 * Cache line mostly used on receive path (including eth_type_trans())
411 struct list_head poll_list ____cacheline_aligned_in_smp;
412 /* Link to poll list */
414 int (*poll) (struct net_device *dev, int *quota);
417 unsigned long last_rx; /* Time of last Rx */
418 /* Interface address info used in eth_type_trans() */
419 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
420 because most packets are unicast) */
422 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
425 * Cache line mostly used on queue transmit path (qdisc)
427 /* device queue lock */
428 spinlock_t queue_lock ____cacheline_aligned_in_smp;
430 struct Qdisc *qdisc_sleeping;
431 struct list_head qdisc_list;
432 unsigned long tx_queue_len; /* Max frames per queue allowed */
434 /* Partially transmitted GSO packet. */
435 struct sk_buff *gso_skb;
437 /* ingress path synchronizer */
438 spinlock_t ingress_lock;
439 struct Qdisc *qdisc_ingress;
442 * One part is mostly used on xmit path (device)
444 /* hard_start_xmit synchronizer */
445 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
446 /* cpu id of processor entered to hard_start_xmit or -1,
447 if nobody entered there.
450 void *priv; /* pointer to private data */
451 int (*hard_start_xmit) (struct sk_buff *skb,
452 struct net_device *dev);
453 /* These may be needed for future network-power-down code. */
454 unsigned long trans_start; /* Time (in jiffies) of last Tx */
456 int watchdog_timeo; /* used by dev_watchdog() */
457 struct timer_list watchdog_timer;
460 * refcnt is a very hot point, so align it on SMP
462 /* Number of references to this device */
463 atomic_t refcnt ____cacheline_aligned_in_smp;
465 /* delayed register/unregister */
466 struct list_head todo_list;
467 /* device index hash chain */
468 struct hlist_node index_hlist;
470 struct net_device *link_watch_next;
472 /* register/unregister state machine */
473 enum { NETREG_UNINITIALIZED=0,
474 NETREG_REGISTERED, /* completed register_netdevice */
475 NETREG_UNREGISTERING, /* called unregister_netdevice */
476 NETREG_UNREGISTERED, /* completed unregister todo */
477 NETREG_RELEASED, /* called free_netdev */
480 /* Called after device is detached from network. */
481 void (*uninit)(struct net_device *dev);
482 /* Called after last user reference disappears. */
483 void (*destructor)(struct net_device *dev);
485 /* Pointers to interface service routines. */
486 int (*open)(struct net_device *dev);
487 int (*stop)(struct net_device *dev);
488 #define HAVE_NETDEV_POLL
489 int (*hard_header) (struct sk_buff *skb,
490 struct net_device *dev,
495 int (*rebuild_header)(struct sk_buff *skb);
496 #define HAVE_MULTICAST
497 void (*set_multicast_list)(struct net_device *dev);
498 #define HAVE_SET_MAC_ADDR
499 int (*set_mac_address)(struct net_device *dev,
501 #define HAVE_PRIVATE_IOCTL
502 int (*do_ioctl)(struct net_device *dev,
503 struct ifreq *ifr, int cmd);
504 #define HAVE_SET_CONFIG
505 int (*set_config)(struct net_device *dev,
507 #define HAVE_HEADER_CACHE
508 int (*hard_header_cache)(struct neighbour *neigh,
509 struct hh_cache *hh);
510 void (*header_cache_update)(struct hh_cache *hh,
511 struct net_device *dev,
512 unsigned char * haddr);
513 #define HAVE_CHANGE_MTU
514 int (*change_mtu)(struct net_device *dev, int new_mtu);
516 #define HAVE_TX_TIMEOUT
517 void (*tx_timeout) (struct net_device *dev);
519 void (*vlan_rx_register)(struct net_device *dev,
520 struct vlan_group *grp);
521 void (*vlan_rx_add_vid)(struct net_device *dev,
523 void (*vlan_rx_kill_vid)(struct net_device *dev,
526 int (*hard_header_parse)(struct sk_buff *skb,
527 unsigned char *haddr);
528 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
529 #ifdef CONFIG_NETPOLL
530 struct netpoll_info *npinfo;
532 #ifdef CONFIG_NET_POLL_CONTROLLER
533 void (*poll_controller)(struct net_device *dev);
537 struct net_bridge_port *br_port;
539 /* class/net/name entry */
541 /* space for optional statistics and wireless sysfs groups */
542 struct attribute_group *sysfs_groups[3];
544 #define to_net_dev(d) container_of(d, struct net_device, dev)
546 #define NETDEV_ALIGN 32
547 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
549 static inline void *netdev_priv(struct net_device *dev)
551 return (char *)dev + ((sizeof(struct net_device)
552 + NETDEV_ALIGN_CONST)
553 & ~NETDEV_ALIGN_CONST);
556 #define SET_MODULE_OWNER(dev) do { } while (0)
557 /* Set the sysfs physical device reference for the network logical device
558 * if set prior to registration will cause a symlink during initialization.
560 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
563 __be16 type; /* This is really htons(ether_type). */
564 struct net_device *dev; /* NULL is wildcarded here */
565 int (*func) (struct sk_buff *,
567 struct packet_type *,
568 struct net_device *);
569 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
571 int (*gso_send_check)(struct sk_buff *skb);
572 void *af_packet_priv;
573 struct list_head list;
576 #include <linux/interrupt.h>
577 #include <linux/notifier.h>
579 extern struct net_device loopback_dev; /* The loopback */
580 extern struct list_head dev_base_head; /* All devices */
581 extern rwlock_t dev_base_lock; /* Device list lock */
583 #define for_each_netdev(d) \
584 list_for_each_entry(d, &dev_base_head, dev_list)
585 #define for_each_netdev_safe(d, n) \
586 list_for_each_entry_safe(d, n, &dev_base_head, dev_list)
587 #define for_each_netdev_continue(d) \
588 list_for_each_entry_continue(d, &dev_base_head, dev_list)
589 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
591 static inline struct net_device *next_net_device(struct net_device *dev)
593 struct list_head *lh;
595 lh = dev->dev_list.next;
596 return lh == &dev_base_head ? NULL : net_device_entry(lh);
599 static inline struct net_device *first_net_device(void)
601 return list_empty(&dev_base_head) ? NULL :
602 net_device_entry(dev_base_head.next);
605 extern int netdev_boot_setup_check(struct net_device *dev);
606 extern unsigned long netdev_boot_base(const char *prefix, int unit);
607 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr);
608 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
609 extern struct net_device *__dev_getfirstbyhwtype(unsigned short type);
610 extern void dev_add_pack(struct packet_type *pt);
611 extern void dev_remove_pack(struct packet_type *pt);
612 extern void __dev_remove_pack(struct packet_type *pt);
614 extern struct net_device *dev_get_by_flags(unsigned short flags,
615 unsigned short mask);
616 extern struct net_device *dev_get_by_name(const char *name);
617 extern struct net_device *__dev_get_by_name(const char *name);
618 extern int dev_alloc_name(struct net_device *dev, const char *name);
619 extern int dev_open(struct net_device *dev);
620 extern int dev_close(struct net_device *dev);
621 extern int dev_queue_xmit(struct sk_buff *skb);
622 extern int register_netdevice(struct net_device *dev);
623 extern void unregister_netdevice(struct net_device *dev);
624 extern void free_netdev(struct net_device *dev);
625 extern void synchronize_net(void);
626 extern int register_netdevice_notifier(struct notifier_block *nb);
627 extern int unregister_netdevice_notifier(struct notifier_block *nb);
628 extern int call_netdevice_notifiers(unsigned long val, void *v);
629 extern struct net_device *dev_get_by_index(int ifindex);
630 extern struct net_device *__dev_get_by_index(int ifindex);
631 extern int dev_restart(struct net_device *dev);
632 #ifdef CONFIG_NETPOLL_TRAP
633 extern int netpoll_trap(void);
636 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
637 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
638 static inline int unregister_gifconf(unsigned int family)
640 return register_gifconf(family, NULL);
644 * Incoming packets are placed on per-cpu queues so that
645 * no locking is needed.
650 struct net_device *output_queue;
651 struct sk_buff_head input_pkt_queue;
652 struct list_head poll_list;
653 struct sk_buff *completion_queue;
655 struct net_device backlog_dev; /* Sorry. 8) */
656 #ifdef CONFIG_NET_DMA
657 struct dma_chan *net_dma;
661 DECLARE_PER_CPU(struct softnet_data,softnet_data);
663 #define HAVE_NETIF_QUEUE
665 extern void __netif_schedule(struct net_device *dev);
667 static inline void netif_schedule(struct net_device *dev)
669 if (!test_bit(__LINK_STATE_XOFF, &dev->state))
670 __netif_schedule(dev);
673 static inline void netif_start_queue(struct net_device *dev)
675 clear_bit(__LINK_STATE_XOFF, &dev->state);
678 static inline void netif_wake_queue(struct net_device *dev)
680 #ifdef CONFIG_NETPOLL_TRAP
681 if (netpoll_trap()) {
682 clear_bit(__LINK_STATE_XOFF, &dev->state);
686 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
687 __netif_schedule(dev);
690 static inline void netif_stop_queue(struct net_device *dev)
692 set_bit(__LINK_STATE_XOFF, &dev->state);
695 static inline int netif_queue_stopped(const struct net_device *dev)
697 return test_bit(__LINK_STATE_XOFF, &dev->state);
700 static inline int netif_running(const struct net_device *dev)
702 return test_bit(__LINK_STATE_START, &dev->state);
706 /* Use this variant when it is known for sure that it
707 * is executing from interrupt context.
709 static inline void dev_kfree_skb_irq(struct sk_buff *skb)
711 if (atomic_dec_and_test(&skb->users)) {
712 struct softnet_data *sd;
715 local_irq_save(flags);
716 sd = &__get_cpu_var(softnet_data);
717 skb->next = sd->completion_queue;
718 sd->completion_queue = skb;
719 raise_softirq_irqoff(NET_TX_SOFTIRQ);
720 local_irq_restore(flags);
724 /* Use this variant in places where it could be invoked
725 * either from interrupt or non-interrupt context.
727 extern void dev_kfree_skb_any(struct sk_buff *skb);
729 #define HAVE_NETIF_RX 1
730 extern int netif_rx(struct sk_buff *skb);
731 extern int netif_rx_ni(struct sk_buff *skb);
732 #define HAVE_NETIF_RECEIVE_SKB 1
733 extern int netif_receive_skb(struct sk_buff *skb);
734 extern int dev_valid_name(const char *name);
735 extern int dev_ioctl(unsigned int cmd, void __user *);
736 extern int dev_ethtool(struct ifreq *);
737 extern unsigned dev_get_flags(const struct net_device *);
738 extern int dev_change_flags(struct net_device *, unsigned);
739 extern int dev_change_name(struct net_device *, char *);
740 extern int dev_set_mtu(struct net_device *, int);
741 extern int dev_set_mac_address(struct net_device *,
743 extern int dev_hard_start_xmit(struct sk_buff *skb,
744 struct net_device *dev);
746 extern void dev_init(void);
748 extern int netdev_budget;
750 /* Called by rtnetlink.c:rtnl_unlock() */
751 extern void netdev_run_todo(void);
753 static inline void dev_put(struct net_device *dev)
755 atomic_dec(&dev->refcnt);
758 static inline void dev_hold(struct net_device *dev)
760 atomic_inc(&dev->refcnt);
763 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
764 * and _off may be called from IRQ context, but it is caller
765 * who is responsible for serialization of these calls.
767 * The name carrier is inappropriate, these functions should really be
768 * called netif_lowerlayer_*() because they represent the state of any
769 * kind of lower layer not just hardware media.
772 extern void linkwatch_fire_event(struct net_device *dev);
774 static inline int netif_carrier_ok(const struct net_device *dev)
776 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
779 extern void __netdev_watchdog_up(struct net_device *dev);
781 extern void netif_carrier_on(struct net_device *dev);
783 extern void netif_carrier_off(struct net_device *dev);
785 static inline void netif_dormant_on(struct net_device *dev)
787 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
788 linkwatch_fire_event(dev);
791 static inline void netif_dormant_off(struct net_device *dev)
793 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
794 linkwatch_fire_event(dev);
797 static inline int netif_dormant(const struct net_device *dev)
799 return test_bit(__LINK_STATE_DORMANT, &dev->state);
803 static inline int netif_oper_up(const struct net_device *dev) {
804 return (dev->operstate == IF_OPER_UP ||
805 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
809 static inline int netif_device_present(struct net_device *dev)
811 return test_bit(__LINK_STATE_PRESENT, &dev->state);
814 extern void netif_device_detach(struct net_device *dev);
816 extern void netif_device_attach(struct net_device *dev);
819 * Network interface message level settings
821 #define HAVE_NETIF_MSG 1
824 NETIF_MSG_DRV = 0x0001,
825 NETIF_MSG_PROBE = 0x0002,
826 NETIF_MSG_LINK = 0x0004,
827 NETIF_MSG_TIMER = 0x0008,
828 NETIF_MSG_IFDOWN = 0x0010,
829 NETIF_MSG_IFUP = 0x0020,
830 NETIF_MSG_RX_ERR = 0x0040,
831 NETIF_MSG_TX_ERR = 0x0080,
832 NETIF_MSG_TX_QUEUED = 0x0100,
833 NETIF_MSG_INTR = 0x0200,
834 NETIF_MSG_TX_DONE = 0x0400,
835 NETIF_MSG_RX_STATUS = 0x0800,
836 NETIF_MSG_PKTDATA = 0x1000,
837 NETIF_MSG_HW = 0x2000,
838 NETIF_MSG_WOL = 0x4000,
841 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
842 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
843 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
844 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
845 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
846 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
847 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
848 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
849 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
850 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
851 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
852 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
853 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
854 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
855 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
857 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
860 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
861 return default_msg_enable_bits;
862 if (debug_value == 0) /* no output */
865 return (1 << debug_value) - 1;
868 /* Test if receive needs to be scheduled */
869 static inline int __netif_rx_schedule_prep(struct net_device *dev)
871 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
874 /* Test if receive needs to be scheduled but only if up */
875 static inline int netif_rx_schedule_prep(struct net_device *dev)
877 return netif_running(dev) && __netif_rx_schedule_prep(dev);
880 /* Add interface to tail of rx poll list. This assumes that _prep has
881 * already been called and returned 1.
884 extern void __netif_rx_schedule(struct net_device *dev);
886 /* Try to reschedule poll. Called by irq handler. */
888 static inline void netif_rx_schedule(struct net_device *dev)
890 if (netif_rx_schedule_prep(dev))
891 __netif_rx_schedule(dev);
894 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
895 * Do not inline this?
897 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
899 if (netif_rx_schedule_prep(dev)) {
904 local_irq_save(flags);
905 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
906 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
907 local_irq_restore(flags);
913 /* Remove interface from poll list: it must be in the poll list
914 * on current cpu. This primitive is called by dev->poll(), when
915 * it completes the work. The device cannot be out of poll list at this
916 * moment, it is BUG().
918 static inline void netif_rx_complete(struct net_device *dev)
922 local_irq_save(flags);
923 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
924 list_del(&dev->poll_list);
925 smp_mb__before_clear_bit();
926 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
927 local_irq_restore(flags);
930 static inline void netif_poll_disable(struct net_device *dev)
932 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state))
934 schedule_timeout_interruptible(1);
937 static inline void netif_poll_enable(struct net_device *dev)
939 smp_mb__before_clear_bit();
940 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
943 /* same as netif_rx_complete, except that local_irq_save(flags)
944 * has already been issued
946 static inline void __netif_rx_complete(struct net_device *dev)
948 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state));
949 list_del(&dev->poll_list);
950 smp_mb__before_clear_bit();
951 clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
954 static inline void netif_tx_lock(struct net_device *dev)
956 spin_lock(&dev->_xmit_lock);
957 dev->xmit_lock_owner = smp_processor_id();
960 static inline void netif_tx_lock_bh(struct net_device *dev)
962 spin_lock_bh(&dev->_xmit_lock);
963 dev->xmit_lock_owner = smp_processor_id();
966 static inline int netif_tx_trylock(struct net_device *dev)
968 int ok = spin_trylock(&dev->_xmit_lock);
970 dev->xmit_lock_owner = smp_processor_id();
974 static inline void netif_tx_unlock(struct net_device *dev)
976 dev->xmit_lock_owner = -1;
977 spin_unlock(&dev->_xmit_lock);
980 static inline void netif_tx_unlock_bh(struct net_device *dev)
982 dev->xmit_lock_owner = -1;
983 spin_unlock_bh(&dev->_xmit_lock);
986 static inline void netif_tx_disable(struct net_device *dev)
988 netif_tx_lock_bh(dev);
989 netif_stop_queue(dev);
990 netif_tx_unlock_bh(dev);
993 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
995 extern void ether_setup(struct net_device *dev);
997 /* Support for loadable net-drivers */
998 extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
999 void (*setup)(struct net_device *));
1000 extern int register_netdev(struct net_device *dev);
1001 extern void unregister_netdev(struct net_device *dev);
1002 /* Functions used for multicast support */
1003 extern void dev_mc_upload(struct net_device *dev);
1004 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1005 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1006 extern void dev_mc_discard(struct net_device *dev);
1007 extern void dev_set_promiscuity(struct net_device *dev, int inc);
1008 extern void dev_set_allmulti(struct net_device *dev, int inc);
1009 extern void netdev_state_change(struct net_device *dev);
1010 extern void netdev_features_change(struct net_device *dev);
1011 /* Load a device via the kmod */
1012 extern void dev_load(const char *name);
1013 extern void dev_mcast_init(void);
1014 extern int netdev_max_backlog;
1015 extern int weight_p;
1016 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1017 extern int skb_checksum_help(struct sk_buff *skb);
1018 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1020 extern void netdev_rx_csum_fault(struct net_device *dev);
1022 static inline void netdev_rx_csum_fault(struct net_device *dev)
1026 /* rx skb timestamps */
1027 extern void net_enable_timestamp(void);
1028 extern void net_disable_timestamp(void);
1030 #ifdef CONFIG_PROC_FS
1031 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1032 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1033 extern void dev_seq_stop(struct seq_file *seq, void *v);
1036 extern void linkwatch_run_queue(void);
1038 static inline int net_gso_ok(int features, int gso_type)
1040 int feature = gso_type << NETIF_F_GSO_SHIFT;
1041 return (features & feature) == feature;
1044 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1046 return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1049 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1051 return skb_is_gso(skb) &&
1052 (!skb_gso_ok(skb, dev->features) ||
1053 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1056 /* On bonding slaves other than the currently active slave, suppress
1057 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1058 * ARP on active-backup slaves with arp_validate enabled.
1060 static inline int skb_bond_should_drop(struct sk_buff *skb)
1062 struct net_device *dev = skb->dev;
1063 struct net_device *master = dev->master;
1066 (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
1067 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1068 skb->protocol == __constant_htons(ETH_P_ARP))
1071 if (master->priv_flags & IFF_MASTER_ALB) {
1072 if (skb->pkt_type != PACKET_BROADCAST &&
1073 skb->pkt_type != PACKET_MULTICAST)
1076 if (master->priv_flags & IFF_MASTER_8023AD &&
1077 skb->protocol == __constant_htons(ETH_P_SLOW))
1085 #endif /* __KERNEL__ */
1087 #endif /* _LINUX_DEV_H */