2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Definitions for the Interfaces handler.
8 * Version: @(#)dev.h 1.0.10 08/12/93
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
14 * Alan Cox, <alan@lxorguk.ukuu.org.uk>
15 * Bjorn Ekwall. <bj0rn@blox.se>
16 * Pekka Riikonen <priikone@poseidon.pspt.fi>
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
23 * Moved to /usr/include/linux for NET3
25 #ifndef _LINUX_NETDEVICE_H
26 #define _LINUX_NETDEVICE_H
29 #include <linux/if_ether.h>
30 #include <linux/if_packet.h>
33 #include <linux/timer.h>
34 #include <linux/delay.h>
36 #include <asm/atomic.h>
37 #include <asm/cache.h>
38 #include <asm/byteorder.h>
40 #include <linux/device.h>
41 #include <linux/percpu.h>
42 #include <linux/rculist.h>
43 #include <linux/dmaengine.h>
44 #include <linux/workqueue.h>
46 #include <linux/ethtool.h>
47 #include <net/net_namespace.h>
50 #include <net/dcbnl.h>
57 /* source back-compat hooks */
58 #define SET_ETHTOOL_OPS(netdev,ops) \
59 ( (netdev)->ethtool_ops = (ops) )
61 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
62 functions are available. */
63 #define HAVE_FREE_NETDEV /* free_netdev() */
64 #define HAVE_NETDEV_PRIV /* netdev_priv() */
66 #define NET_XMIT_SUCCESS 0
67 #define NET_XMIT_DROP 1 /* skb dropped */
68 #define NET_XMIT_CN 2 /* congestion notification */
69 #define NET_XMIT_POLICED 3 /* skb is shot by police */
70 #define NET_XMIT_MASK 0xFFFF /* qdisc flags in net/sch_generic.h */
72 /* Backlog congestion levels */
73 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
74 #define NET_RX_DROP 1 /* packet dropped */
75 #define NET_RX_CN_LOW 2 /* storm alert, just in case */
76 #define NET_RX_CN_MOD 3 /* Storm on its way! */
77 #define NET_RX_CN_HIGH 4 /* The storm is here */
78 #define NET_RX_BAD 5 /* packet dropped due to kernel error */
80 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
81 * indicates that the device will soon be dropping packets, or already drops
82 * some packets of the same priority; prompting us to send less aggressively. */
83 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e))
84 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
88 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
90 /* Driver transmit return codes */
91 #define NETDEV_TX_OK 0 /* driver took care of packet */
92 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
93 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
98 * Compute the worst case header length according to the protocols
102 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
103 # if defined(CONFIG_MAC80211_MESH)
104 # define LL_MAX_HEADER 128
106 # define LL_MAX_HEADER 96
108 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
109 # define LL_MAX_HEADER 48
111 # define LL_MAX_HEADER 32
114 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
115 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
116 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
117 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
118 #define MAX_HEADER LL_MAX_HEADER
120 #define MAX_HEADER (LL_MAX_HEADER + 48)
123 #endif /* __KERNEL__ */
126 * Network device statistics. Akin to the 2.0 ether stats but
127 * with byte counters.
130 struct net_device_stats
132 unsigned long rx_packets; /* total packets received */
133 unsigned long tx_packets; /* total packets transmitted */
134 unsigned long rx_bytes; /* total bytes received */
135 unsigned long tx_bytes; /* total bytes transmitted */
136 unsigned long rx_errors; /* bad packets received */
137 unsigned long tx_errors; /* packet transmit problems */
138 unsigned long rx_dropped; /* no space in linux buffers */
139 unsigned long tx_dropped; /* no space available in linux */
140 unsigned long multicast; /* multicast packets received */
141 unsigned long collisions;
143 /* detailed rx_errors: */
144 unsigned long rx_length_errors;
145 unsigned long rx_over_errors; /* receiver ring buff overflow */
146 unsigned long rx_crc_errors; /* recved pkt with crc error */
147 unsigned long rx_frame_errors; /* recv'd frame alignment error */
148 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
149 unsigned long rx_missed_errors; /* receiver missed packet */
151 /* detailed tx_errors */
152 unsigned long tx_aborted_errors;
153 unsigned long tx_carrier_errors;
154 unsigned long tx_fifo_errors;
155 unsigned long tx_heartbeat_errors;
156 unsigned long tx_window_errors;
159 unsigned long rx_compressed;
160 unsigned long tx_compressed;
164 /* Media selection options. */
177 #include <linux/cache.h>
178 #include <linux/skbuff.h>
184 struct netif_rx_stats
188 unsigned time_squeeze;
189 unsigned cpu_collision;
192 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
196 struct dev_addr_list *next;
197 u8 da_addr[MAX_ADDR_LEN];
205 * We tag multicasts with these structures.
208 #define dev_mc_list dev_addr_list
209 #define dmi_addr da_addr
210 #define dmi_addrlen da_addrlen
211 #define dmi_users da_users
212 #define dmi_gusers da_gusers
214 struct netdev_hw_addr {
215 struct list_head list;
216 unsigned char addr[MAX_ADDR_LEN];
218 #define NETDEV_HW_ADDR_T_LAN 1
219 #define NETDEV_HW_ADDR_T_SAN 2
220 #define NETDEV_HW_ADDR_T_SLAVE 3
221 #define NETDEV_HW_ADDR_T_UNICAST 4
224 struct rcu_head rcu_head;
227 struct netdev_hw_addr_list {
228 struct list_head list;
234 struct hh_cache *hh_next; /* Next entry */
235 atomic_t hh_refcnt; /* number of users */
237 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
239 * They are mostly read, but hh_refcnt may be changed quite frequently,
240 * incurring cache line ping pongs.
242 __be16 hh_type ____cacheline_aligned_in_smp;
243 /* protocol identifier, f.e ETH_P_IP
244 * NOTE: For VLANs, this will be the
245 * encapuslated type. --BLG
247 u16 hh_len; /* length of header */
248 int (*hh_output)(struct sk_buff *skb);
251 /* cached hardware header; allow for machine alignment needs. */
252 #define HH_DATA_MOD 16
253 #define HH_DATA_OFF(__len) \
254 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
255 #define HH_DATA_ALIGN(__len) \
256 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
257 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
260 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
262 * dev->hard_header_len ? (dev->hard_header_len +
263 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
265 * We could use other alignment values, but we must maintain the
266 * relationship HH alignment <= LL alignment.
268 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
271 #define LL_RESERVED_SPACE(dev) \
272 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
273 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
274 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
275 #define LL_ALLOCATED_SPACE(dev) \
276 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
279 int (*create) (struct sk_buff *skb, struct net_device *dev,
280 unsigned short type, const void *daddr,
281 const void *saddr, unsigned len);
282 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
283 int (*rebuild)(struct sk_buff *skb);
284 #define HAVE_HEADER_CACHE
285 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
286 void (*cache_update)(struct hh_cache *hh,
287 const struct net_device *dev,
288 const unsigned char *haddr);
291 /* These flag bits are private to the generic network queueing
292 * layer, they may not be explicitly referenced by any other
299 __LINK_STATE_PRESENT,
300 __LINK_STATE_NOCARRIER,
301 __LINK_STATE_LINKWATCH_PENDING,
302 __LINK_STATE_DORMANT,
307 * This structure holds at boot time configured netdevice settings. They
308 * are then used in the device probing.
310 struct netdev_boot_setup {
314 #define NETDEV_BOOT_SETUP_MAX 8
316 extern int __init netdev_boot_setup(char *str);
319 * Structure for NAPI scheduling similar to tasklet but with weighting
322 /* The poll_list must only be managed by the entity which
323 * changes the state of the NAPI_STATE_SCHED bit. This means
324 * whoever atomically sets that bit can add this napi_struct
325 * to the per-cpu poll_list, and whoever clears that bit
326 * can remove from the list right before clearing the bit.
328 struct list_head poll_list;
332 int (*poll)(struct napi_struct *, int);
333 #ifdef CONFIG_NETPOLL
334 spinlock_t poll_lock;
338 unsigned int gro_count;
340 struct net_device *dev;
341 struct list_head dev_list;
342 struct sk_buff *gro_list;
348 NAPI_STATE_SCHED, /* Poll is scheduled */
349 NAPI_STATE_DISABLE, /* Disable pending */
350 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
361 extern void __napi_schedule(struct napi_struct *n);
363 static inline int napi_disable_pending(struct napi_struct *n)
365 return test_bit(NAPI_STATE_DISABLE, &n->state);
369 * napi_schedule_prep - check if napi can be scheduled
372 * Test if NAPI routine is already running, and if not mark
373 * it as running. This is used as a condition variable
374 * insure only one NAPI poll instance runs. We also make
375 * sure there is no pending NAPI disable.
377 static inline int napi_schedule_prep(struct napi_struct *n)
379 return !napi_disable_pending(n) &&
380 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
384 * napi_schedule - schedule NAPI poll
387 * Schedule NAPI poll routine to be called if it is not already
390 static inline void napi_schedule(struct napi_struct *n)
392 if (napi_schedule_prep(n))
396 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
397 static inline int napi_reschedule(struct napi_struct *napi)
399 if (napi_schedule_prep(napi)) {
400 __napi_schedule(napi);
407 * napi_complete - NAPI processing complete
410 * Mark NAPI processing as complete.
412 extern void __napi_complete(struct napi_struct *n);
413 extern void napi_complete(struct napi_struct *n);
416 * napi_disable - prevent NAPI from scheduling
419 * Stop NAPI from being scheduled on this context.
420 * Waits till any outstanding processing completes.
422 static inline void napi_disable(struct napi_struct *n)
424 set_bit(NAPI_STATE_DISABLE, &n->state);
425 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
427 clear_bit(NAPI_STATE_DISABLE, &n->state);
431 * napi_enable - enable NAPI scheduling
434 * Resume NAPI from being scheduled on this context.
435 * Must be paired with napi_disable.
437 static inline void napi_enable(struct napi_struct *n)
439 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
440 smp_mb__before_clear_bit();
441 clear_bit(NAPI_STATE_SCHED, &n->state);
446 * napi_synchronize - wait until NAPI is not running
449 * Wait until NAPI is done being scheduled on this context.
450 * Waits till any outstanding processing completes but
451 * does not disable future activations.
453 static inline void napi_synchronize(const struct napi_struct *n)
455 while (test_bit(NAPI_STATE_SCHED, &n->state))
459 # define napi_synchronize(n) barrier()
462 enum netdev_queue_state_t
465 __QUEUE_STATE_FROZEN,
468 struct netdev_queue {
472 struct net_device *dev;
475 struct Qdisc *qdisc_sleeping;
479 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
482 * please use this field instead of dev->trans_start
484 unsigned long trans_start;
485 unsigned long tx_bytes;
486 unsigned long tx_packets;
487 unsigned long tx_dropped;
488 } ____cacheline_aligned_in_smp;
492 * This structure defines the management hooks for network devices.
493 * The following hooks can be defined; unless noted otherwise, they are
494 * optional and can be filled with a null pointer.
496 * int (*ndo_init)(struct net_device *dev);
497 * This function is called once when network device is registered.
498 * The network device can use this to any late stage initializaton
499 * or semantic validattion. It can fail with an error code which will
500 * be propogated back to register_netdev
502 * void (*ndo_uninit)(struct net_device *dev);
503 * This function is called when device is unregistered or when registration
504 * fails. It is not called if init fails.
506 * int (*ndo_open)(struct net_device *dev);
507 * This function is called when network device transistions to the up
510 * int (*ndo_stop)(struct net_device *dev);
511 * This function is called when network device transistions to the down
514 * int (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev);
515 * Called when a packet needs to be transmitted.
516 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY, or NETDEV_TX_LOCKED,
517 * Required can not be NULL.
519 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
520 * Called to decide which queue to when device supports multiple
523 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
524 * This function is called to allow device receiver to make
525 * changes to configuration when multicast or promiscious is enabled.
527 * void (*ndo_set_rx_mode)(struct net_device *dev);
528 * This function is called device changes address list filtering.
530 * void (*ndo_set_multicast_list)(struct net_device *dev);
531 * This function is called when the multicast address list changes.
533 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
534 * This function is called when the Media Access Control address
535 * needs to be changed. If this interface is not defined, the
536 * mac address can not be changed.
538 * int (*ndo_validate_addr)(struct net_device *dev);
539 * Test if Media Access Control address is valid for the device.
541 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
542 * Called when a user request an ioctl which can't be handled by
543 * the generic interface code. If not defined ioctl's return
544 * not supported error code.
546 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
547 * Used to set network devices bus interface parameters. This interface
548 * is retained for legacy reason, new devices should use the bus
549 * interface (PCI) for low level management.
551 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
552 * Called when a user wants to change the Maximum Transfer Unit
553 * of a device. If not defined, any request to change MTU will
554 * will return an error.
556 * void (*ndo_tx_timeout)(struct net_device *dev);
557 * Callback uses when the transmitter has not made any progress
558 * for dev->watchdog ticks.
560 * struct net_device_stats* (*get_stats)(struct net_device *dev);
561 * Called when a user wants to get the network device usage
562 * statistics. If not defined, the counters in dev->stats will
565 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
566 * If device support VLAN receive accleration
567 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
568 * when vlan groups for the device changes. Note: grp is NULL
569 * if no vlan's groups are being used.
571 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
572 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
573 * this function is called when a VLAN id is registered.
575 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
576 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
577 * this function is called when a VLAN id is unregistered.
579 * void (*ndo_poll_controller)(struct net_device *dev);
581 #define HAVE_NET_DEVICE_OPS
582 struct net_device_ops {
583 int (*ndo_init)(struct net_device *dev);
584 void (*ndo_uninit)(struct net_device *dev);
585 int (*ndo_open)(struct net_device *dev);
586 int (*ndo_stop)(struct net_device *dev);
587 int (*ndo_start_xmit) (struct sk_buff *skb,
588 struct net_device *dev);
589 u16 (*ndo_select_queue)(struct net_device *dev,
590 struct sk_buff *skb);
591 #define HAVE_CHANGE_RX_FLAGS
592 void (*ndo_change_rx_flags)(struct net_device *dev,
594 #define HAVE_SET_RX_MODE
595 void (*ndo_set_rx_mode)(struct net_device *dev);
596 #define HAVE_MULTICAST
597 void (*ndo_set_multicast_list)(struct net_device *dev);
598 #define HAVE_SET_MAC_ADDR
599 int (*ndo_set_mac_address)(struct net_device *dev,
601 #define HAVE_VALIDATE_ADDR
602 int (*ndo_validate_addr)(struct net_device *dev);
603 #define HAVE_PRIVATE_IOCTL
604 int (*ndo_do_ioctl)(struct net_device *dev,
605 struct ifreq *ifr, int cmd);
606 #define HAVE_SET_CONFIG
607 int (*ndo_set_config)(struct net_device *dev,
609 #define HAVE_CHANGE_MTU
610 int (*ndo_change_mtu)(struct net_device *dev,
612 int (*ndo_neigh_setup)(struct net_device *dev,
613 struct neigh_parms *);
614 #define HAVE_TX_TIMEOUT
615 void (*ndo_tx_timeout) (struct net_device *dev);
617 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
619 void (*ndo_vlan_rx_register)(struct net_device *dev,
620 struct vlan_group *grp);
621 void (*ndo_vlan_rx_add_vid)(struct net_device *dev,
623 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
625 #ifdef CONFIG_NET_POLL_CONTROLLER
626 #define HAVE_NETDEV_POLL
627 void (*ndo_poll_controller)(struct net_device *dev);
629 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
630 int (*ndo_fcoe_ddp_setup)(struct net_device *dev,
632 struct scatterlist *sgl,
634 int (*ndo_fcoe_ddp_done)(struct net_device *dev,
640 * The DEVICE structure.
641 * Actually, this whole structure is a big mistake. It mixes I/O
642 * data with strictly "high-level" data, and it has to know about
643 * almost every data structure used in the INET module.
645 * FIXME: cleanup struct net_device such that network protocol info
653 * This is the first field of the "visible" part of this structure
654 * (i.e. as seen by users in the "Space.c" file). It is the name
658 /* device name hash chain */
659 struct hlist_node name_hlist;
664 * I/O specific fields
665 * FIXME: Merge these and struct ifmap into one
667 unsigned long mem_end; /* shared mem end */
668 unsigned long mem_start; /* shared mem start */
669 unsigned long base_addr; /* device I/O address */
670 unsigned int irq; /* device IRQ number */
673 * Some hardware also needs these fields, but they are not
674 * part of the usual set specified in Space.c.
677 unsigned char if_port; /* Selectable AUI, TP,..*/
678 unsigned char dma; /* DMA channel */
682 struct list_head dev_list;
683 struct list_head napi_list;
685 /* Net device features */
686 unsigned long features;
687 #define NETIF_F_SG 1 /* Scatter/gather IO. */
688 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
689 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
690 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
691 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
692 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
693 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
694 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
695 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
696 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
697 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
698 #define NETIF_F_GSO 2048 /* Enable software GSO. */
699 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
700 /* do not use LLTX in new drivers */
701 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
702 #define NETIF_F_GRO 16384 /* Generic receive offload */
703 #define NETIF_F_LRO 32768 /* large receive offload */
705 /* the GSO_MASK reserves bits 16 through 23 */
706 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */
707 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */
709 /* Segmentation offload features */
710 #define NETIF_F_GSO_SHIFT 16
711 #define NETIF_F_GSO_MASK 0x00ff0000
712 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
713 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
714 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
715 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
716 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
717 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
719 /* List of features with software fallbacks. */
720 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
723 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
724 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
725 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
726 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
729 * If one device supports one of these features, then enable them
730 * for all in netdev_increment_features.
732 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
733 NETIF_F_SG | NETIF_F_HIGHDMA | \
736 /* Interface index. Unique device identifier */
740 struct net_device_stats stats;
742 #ifdef CONFIG_WIRELESS_EXT
743 /* List of functions to handle Wireless Extensions (instead of ioctl).
744 * See <net/iw_handler.h> for details. Jean II */
745 const struct iw_handler_def * wireless_handlers;
746 /* Instance data managed by the core of Wireless Extensions. */
747 struct iw_public_data * wireless_data;
749 /* Management operations */
750 const struct net_device_ops *netdev_ops;
751 const struct ethtool_ops *ethtool_ops;
753 /* Hardware header description */
754 const struct header_ops *header_ops;
756 unsigned int flags; /* interface flags (a la BSD) */
757 unsigned short gflags;
758 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
759 unsigned short padded; /* How much padding added by alloc_netdev() */
761 unsigned char operstate; /* RFC2863 operstate */
762 unsigned char link_mode; /* mapping policy to operstate */
764 unsigned mtu; /* interface MTU value */
765 unsigned short type; /* interface hardware type */
766 unsigned short hard_header_len; /* hardware hdr length */
768 /* extra head- and tailroom the hardware may need, but not in all cases
769 * can this be guaranteed, especially tailroom. Some cases also use
770 * LL_MAX_HEADER instead to allocate the skb.
772 unsigned short needed_headroom;
773 unsigned short needed_tailroom;
775 struct net_device *master; /* Pointer to master device of a group,
776 * which this device is member of.
779 /* Interface address info. */
780 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
781 unsigned char addr_len; /* hardware address length */
782 unsigned short dev_id; /* for shared network cards */
784 struct netdev_hw_addr_list uc; /* Secondary unicast
787 spinlock_t addr_list_lock;
788 struct dev_addr_list *mc_list; /* Multicast mac addresses */
789 int mc_count; /* Number of installed mcasts */
790 unsigned int promiscuity;
791 unsigned int allmulti;
794 /* Protocol specific pointers */
796 #ifdef CONFIG_NET_DSA
797 void *dsa_ptr; /* dsa specific data */
799 void *atalk_ptr; /* AppleTalk link */
800 void *ip_ptr; /* IPv4 specific data */
801 void *dn_ptr; /* DECnet specific data */
802 void *ip6_ptr; /* IPv6 specific data */
803 void *ec_ptr; /* Econet specific data */
804 void *ax25_ptr; /* AX.25 specific data */
805 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
806 assign before registering */
809 * Cache line mostly used on receive path (including eth_type_trans())
811 unsigned long last_rx; /* Time of last Rx */
812 /* Interface address info used in eth_type_trans() */
813 unsigned char *dev_addr; /* hw address, (before bcast
814 because most packets are
817 struct netdev_hw_addr_list dev_addrs; /* list of device
820 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
822 struct netdev_queue rx_queue;
824 struct netdev_queue *_tx ____cacheline_aligned_in_smp;
826 /* Number of TX queues allocated at alloc_netdev_mq() time */
827 unsigned int num_tx_queues;
829 /* Number of TX queues currently active in device */
830 unsigned int real_num_tx_queues;
832 unsigned long tx_queue_len; /* Max frames per queue allowed */
833 spinlock_t tx_global_lock;
835 * One part is mostly used on xmit path (device)
837 /* These may be needed for future network-power-down code. */
840 * trans_start here is expensive for high speed devices on SMP,
841 * please use netdev_queue->trans_start instead.
843 unsigned long trans_start; /* Time (in jiffies) of last Tx */
845 int watchdog_timeo; /* used by dev_watchdog() */
846 struct timer_list watchdog_timer;
848 /* Number of references to this device */
849 atomic_t refcnt ____cacheline_aligned_in_smp;
851 /* delayed register/unregister */
852 struct list_head todo_list;
853 /* device index hash chain */
854 struct hlist_node index_hlist;
856 struct net_device *link_watch_next;
858 /* register/unregister state machine */
859 enum { NETREG_UNINITIALIZED=0,
860 NETREG_REGISTERED, /* completed register_netdevice */
861 NETREG_UNREGISTERING, /* called unregister_netdevice */
862 NETREG_UNREGISTERED, /* completed unregister todo */
863 NETREG_RELEASED, /* called free_netdev */
864 NETREG_DUMMY, /* dummy device for NAPI poll */
867 /* Called from unregister, can be used to call free_netdev */
868 void (*destructor)(struct net_device *dev);
870 #ifdef CONFIG_NETPOLL
871 struct netpoll_info *npinfo;
875 /* Network namespace this network device is inside */
879 /* mid-layer private */
883 struct net_bridge_port *br_port;
885 struct macvlan_port *macvlan_port;
887 struct garp_port *garp_port;
889 /* class/net/name entry */
891 /* space for optional statistics and wireless sysfs groups */
892 struct attribute_group *sysfs_groups[3];
894 /* rtnetlink link ops */
895 const struct rtnl_link_ops *rtnl_link_ops;
897 /* VLAN feature mask */
898 unsigned long vlan_features;
900 /* for setting kernel sock attribute on TCP connection setup */
901 #define GSO_MAX_SIZE 65536
902 unsigned int gso_max_size;
905 /* Data Center Bridging netlink ops */
906 struct dcbnl_rtnl_ops *dcbnl_ops;
909 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
910 /* max exchange id for FCoE LRO by ddp */
911 unsigned int fcoe_ddp_xid;
914 #define to_net_dev(d) container_of(d, struct net_device, dev)
916 #define NETDEV_ALIGN 32
919 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
922 return &dev->_tx[index];
925 static inline void netdev_for_each_tx_queue(struct net_device *dev,
926 void (*f)(struct net_device *,
927 struct netdev_queue *,
933 for (i = 0; i < dev->num_tx_queues; i++)
934 f(dev, &dev->_tx[i], arg);
938 * Net namespace inlines
941 struct net *dev_net(const struct net_device *dev)
951 void dev_net_set(struct net_device *dev, struct net *net)
954 release_net(dev->nd_net);
955 dev->nd_net = hold_net(net);
959 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
961 #ifdef CONFIG_NET_DSA_TAG_DSA
962 if (dev->dsa_ptr != NULL)
963 return dsa_uses_dsa_tags(dev->dsa_ptr);
969 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
971 #ifdef CONFIG_NET_DSA_TAG_TRAILER
972 if (dev->dsa_ptr != NULL)
973 return dsa_uses_trailer_tags(dev->dsa_ptr);
980 * netdev_priv - access network device private data
981 * @dev: network device
983 * Get network device private data
985 static inline void *netdev_priv(const struct net_device *dev)
987 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
990 /* Set the sysfs physical device reference for the network logical device
991 * if set prior to registration will cause a symlink during initialization.
993 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
996 * netif_napi_add - initialize a napi context
997 * @dev: network device
998 * @napi: napi context
999 * @poll: polling function
1000 * @weight: default weight
1002 * netif_napi_add() must be used to initialize a napi context prior to calling
1003 * *any* of the other napi related functions.
1005 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1006 int (*poll)(struct napi_struct *, int), int weight);
1009 * netif_napi_del - remove a napi context
1010 * @napi: napi context
1012 * netif_napi_del() removes a napi context from the network device napi list
1014 void netif_napi_del(struct napi_struct *napi);
1016 struct napi_gro_cb {
1017 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1020 /* Length of frag0. */
1021 unsigned int frag0_len;
1023 /* This indicates where we are processing relative to skb->data. */
1026 /* This is non-zero if the packet may be of the same flow. */
1029 /* This is non-zero if the packet cannot be merged with the new skb. */
1032 /* Number of segments aggregated. */
1039 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1041 struct packet_type {
1042 __be16 type; /* This is really htons(ether_type). */
1043 struct net_device *dev; /* NULL is wildcarded here */
1044 int (*func) (struct sk_buff *,
1045 struct net_device *,
1046 struct packet_type *,
1047 struct net_device *);
1048 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
1050 int (*gso_send_check)(struct sk_buff *skb);
1051 struct sk_buff **(*gro_receive)(struct sk_buff **head,
1052 struct sk_buff *skb);
1053 int (*gro_complete)(struct sk_buff *skb);
1054 void *af_packet_priv;
1055 struct list_head list;
1058 #include <linux/interrupt.h>
1059 #include <linux/notifier.h>
1061 extern rwlock_t dev_base_lock; /* Device list lock */
1064 #define for_each_netdev(net, d) \
1065 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1066 #define for_each_netdev_safe(net, d, n) \
1067 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1068 #define for_each_netdev_continue(net, d) \
1069 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1070 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
1072 static inline struct net_device *next_net_device(struct net_device *dev)
1074 struct list_head *lh;
1078 lh = dev->dev_list.next;
1079 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1082 static inline struct net_device *first_net_device(struct net *net)
1084 return list_empty(&net->dev_base_head) ? NULL :
1085 net_device_entry(net->dev_base_head.next);
1088 extern int netdev_boot_setup_check(struct net_device *dev);
1089 extern unsigned long netdev_boot_base(const char *prefix, int unit);
1090 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1091 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1092 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1093 extern void dev_add_pack(struct packet_type *pt);
1094 extern void dev_remove_pack(struct packet_type *pt);
1095 extern void __dev_remove_pack(struct packet_type *pt);
1097 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags,
1098 unsigned short mask);
1099 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
1100 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
1101 extern int dev_alloc_name(struct net_device *dev, const char *name);
1102 extern int dev_open(struct net_device *dev);
1103 extern int dev_close(struct net_device *dev);
1104 extern void dev_disable_lro(struct net_device *dev);
1105 extern int dev_queue_xmit(struct sk_buff *skb);
1106 extern int register_netdevice(struct net_device *dev);
1107 extern void unregister_netdevice(struct net_device *dev);
1108 extern void free_netdev(struct net_device *dev);
1109 extern void synchronize_net(void);
1110 extern int register_netdevice_notifier(struct notifier_block *nb);
1111 extern int unregister_netdevice_notifier(struct notifier_block *nb);
1112 extern int init_dummy_netdev(struct net_device *dev);
1113 extern void netdev_resync_ops(struct net_device *dev);
1115 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1116 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
1117 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
1118 extern int dev_restart(struct net_device *dev);
1119 #ifdef CONFIG_NETPOLL_TRAP
1120 extern int netpoll_trap(void);
1122 extern int skb_gro_receive(struct sk_buff **head,
1123 struct sk_buff *skb);
1124 extern void skb_gro_reset_offset(struct sk_buff *skb);
1126 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1128 return NAPI_GRO_CB(skb)->data_offset;
1131 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1133 return skb->len - NAPI_GRO_CB(skb)->data_offset;
1136 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1138 NAPI_GRO_CB(skb)->data_offset += len;
1141 static inline void *skb_gro_header_fast(struct sk_buff *skb,
1142 unsigned int offset)
1144 return NAPI_GRO_CB(skb)->frag0 + offset;
1147 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1149 return NAPI_GRO_CB(skb)->frag0_len < hlen;
1152 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1153 unsigned int offset)
1155 NAPI_GRO_CB(skb)->frag0 = NULL;
1156 NAPI_GRO_CB(skb)->frag0_len = 0;
1157 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1160 static inline void *skb_gro_mac_header(struct sk_buff *skb)
1162 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1165 static inline void *skb_gro_network_header(struct sk_buff *skb)
1167 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1168 skb_network_offset(skb);
1171 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1172 unsigned short type,
1173 const void *daddr, const void *saddr,
1176 if (!dev->header_ops || !dev->header_ops->create)
1179 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1182 static inline int dev_parse_header(const struct sk_buff *skb,
1183 unsigned char *haddr)
1185 const struct net_device *dev = skb->dev;
1187 if (!dev->header_ops || !dev->header_ops->parse)
1189 return dev->header_ops->parse(skb, haddr);
1192 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1193 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1194 static inline int unregister_gifconf(unsigned int family)
1196 return register_gifconf(family, NULL);
1200 * Incoming packets are placed on per-cpu queues so that
1201 * no locking is needed.
1205 struct Qdisc *output_queue;
1206 struct sk_buff_head input_pkt_queue;
1207 struct list_head poll_list;
1208 struct sk_buff *completion_queue;
1210 struct napi_struct backlog;
1213 DECLARE_PER_CPU(struct softnet_data,softnet_data);
1215 #define HAVE_NETIF_QUEUE
1217 extern void __netif_schedule(struct Qdisc *q);
1219 static inline void netif_schedule_queue(struct netdev_queue *txq)
1221 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1222 __netif_schedule(txq->qdisc);
1225 static inline void netif_tx_schedule_all(struct net_device *dev)
1229 for (i = 0; i < dev->num_tx_queues; i++)
1230 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1233 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1235 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1239 * netif_start_queue - allow transmit
1240 * @dev: network device
1242 * Allow upper layers to call the device hard_start_xmit routine.
1244 static inline void netif_start_queue(struct net_device *dev)
1246 netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1249 static inline void netif_tx_start_all_queues(struct net_device *dev)
1253 for (i = 0; i < dev->num_tx_queues; i++) {
1254 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1255 netif_tx_start_queue(txq);
1259 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1261 #ifdef CONFIG_NETPOLL_TRAP
1262 if (netpoll_trap()) {
1263 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1267 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1268 __netif_schedule(dev_queue->qdisc);
1272 * netif_wake_queue - restart transmit
1273 * @dev: network device
1275 * Allow upper layers to call the device hard_start_xmit routine.
1276 * Used for flow control when transmit resources are available.
1278 static inline void netif_wake_queue(struct net_device *dev)
1280 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1283 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1287 for (i = 0; i < dev->num_tx_queues; i++) {
1288 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1289 netif_tx_wake_queue(txq);
1293 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1295 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1299 * netif_stop_queue - stop transmitted packets
1300 * @dev: network device
1302 * Stop upper layers calling the device hard_start_xmit routine.
1303 * Used for flow control when transmit resources are unavailable.
1305 static inline void netif_stop_queue(struct net_device *dev)
1307 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1310 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1314 for (i = 0; i < dev->num_tx_queues; i++) {
1315 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1316 netif_tx_stop_queue(txq);
1320 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1322 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1326 * netif_queue_stopped - test if transmit queue is flowblocked
1327 * @dev: network device
1329 * Test if transmit queue on device is currently unable to send.
1331 static inline int netif_queue_stopped(const struct net_device *dev)
1333 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1336 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1338 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1342 * netif_running - test if up
1343 * @dev: network device
1345 * Test if the device has been brought up.
1347 static inline int netif_running(const struct net_device *dev)
1349 return test_bit(__LINK_STATE_START, &dev->state);
1353 * Routines to manage the subqueues on a device. We only need start
1354 * stop, and a check if it's stopped. All other device management is
1355 * done at the overall netdevice level.
1356 * Also test the device if we're multiqueue.
1360 * netif_start_subqueue - allow sending packets on subqueue
1361 * @dev: network device
1362 * @queue_index: sub queue index
1364 * Start individual transmit queue of a device with multiple transmit queues.
1366 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1368 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1369 clear_bit(__QUEUE_STATE_XOFF, &txq->state);
1373 * netif_stop_subqueue - stop sending packets on subqueue
1374 * @dev: network device
1375 * @queue_index: sub queue index
1377 * Stop individual transmit queue of a device with multiple transmit queues.
1379 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1381 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1382 #ifdef CONFIG_NETPOLL_TRAP
1386 set_bit(__QUEUE_STATE_XOFF, &txq->state);
1390 * netif_subqueue_stopped - test status of subqueue
1391 * @dev: network device
1392 * @queue_index: sub queue index
1394 * Check individual transmit queue of a device with multiple transmit queues.
1396 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1399 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1400 return test_bit(__QUEUE_STATE_XOFF, &txq->state);
1403 static inline int netif_subqueue_stopped(const struct net_device *dev,
1404 struct sk_buff *skb)
1406 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1410 * netif_wake_subqueue - allow sending packets on subqueue
1411 * @dev: network device
1412 * @queue_index: sub queue index
1414 * Resume individual transmit queue of a device with multiple transmit queues.
1416 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1418 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1419 #ifdef CONFIG_NETPOLL_TRAP
1423 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1424 __netif_schedule(txq->qdisc);
1428 * netif_is_multiqueue - test if device has multiple transmit queues
1429 * @dev: network device
1431 * Check if device has multiple transmit queues
1433 static inline int netif_is_multiqueue(const struct net_device *dev)
1435 return (dev->num_tx_queues > 1);
1438 /* Use this variant when it is known for sure that it
1439 * is executing from hardware interrupt context or with hardware interrupts
1442 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1444 /* Use this variant in places where it could be invoked
1445 * from either hardware interrupt or other context, with hardware interrupts
1446 * either disabled or enabled.
1448 extern void dev_kfree_skb_any(struct sk_buff *skb);
1450 #define HAVE_NETIF_RX 1
1451 extern int netif_rx(struct sk_buff *skb);
1452 extern int netif_rx_ni(struct sk_buff *skb);
1453 #define HAVE_NETIF_RECEIVE_SKB 1
1454 extern int netif_receive_skb(struct sk_buff *skb);
1455 extern void napi_gro_flush(struct napi_struct *napi);
1456 extern int dev_gro_receive(struct napi_struct *napi,
1457 struct sk_buff *skb);
1458 extern int napi_skb_finish(int ret, struct sk_buff *skb);
1459 extern int napi_gro_receive(struct napi_struct *napi,
1460 struct sk_buff *skb);
1461 extern void napi_reuse_skb(struct napi_struct *napi,
1462 struct sk_buff *skb);
1463 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
1464 extern int napi_frags_finish(struct napi_struct *napi,
1465 struct sk_buff *skb, int ret);
1466 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
1467 extern int napi_gro_frags(struct napi_struct *napi);
1469 static inline void napi_free_frags(struct napi_struct *napi)
1471 kfree_skb(napi->skb);
1475 extern void netif_nit_deliver(struct sk_buff *skb);
1476 extern int dev_valid_name(const char *name);
1477 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1478 extern int dev_ethtool(struct net *net, struct ifreq *);
1479 extern unsigned dev_get_flags(const struct net_device *);
1480 extern int dev_change_flags(struct net_device *, unsigned);
1481 extern int dev_change_name(struct net_device *, const char *);
1482 extern int dev_set_alias(struct net_device *, const char *, size_t);
1483 extern int dev_change_net_namespace(struct net_device *,
1484 struct net *, const char *);
1485 extern int dev_set_mtu(struct net_device *, int);
1486 extern int dev_set_mac_address(struct net_device *,
1488 extern int dev_hard_start_xmit(struct sk_buff *skb,
1489 struct net_device *dev,
1490 struct netdev_queue *txq);
1492 extern int netdev_budget;
1494 /* Called by rtnetlink.c:rtnl_unlock() */
1495 extern void netdev_run_todo(void);
1498 * dev_put - release reference to device
1499 * @dev: network device
1501 * Release reference to device to allow it to be freed.
1503 static inline void dev_put(struct net_device *dev)
1505 atomic_dec(&dev->refcnt);
1509 * dev_hold - get reference to device
1510 * @dev: network device
1512 * Hold reference to device to keep it from being freed.
1514 static inline void dev_hold(struct net_device *dev)
1516 atomic_inc(&dev->refcnt);
1519 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1520 * and _off may be called from IRQ context, but it is caller
1521 * who is responsible for serialization of these calls.
1523 * The name carrier is inappropriate, these functions should really be
1524 * called netif_lowerlayer_*() because they represent the state of any
1525 * kind of lower layer not just hardware media.
1528 extern void linkwatch_fire_event(struct net_device *dev);
1531 * netif_carrier_ok - test if carrier present
1532 * @dev: network device
1534 * Check if carrier is present on device
1536 static inline int netif_carrier_ok(const struct net_device *dev)
1538 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1541 extern unsigned long dev_trans_start(struct net_device *dev);
1543 extern void __netdev_watchdog_up(struct net_device *dev);
1545 extern void netif_carrier_on(struct net_device *dev);
1547 extern void netif_carrier_off(struct net_device *dev);
1550 * netif_dormant_on - mark device as dormant.
1551 * @dev: network device
1553 * Mark device as dormant (as per RFC2863).
1555 * The dormant state indicates that the relevant interface is not
1556 * actually in a condition to pass packets (i.e., it is not 'up') but is
1557 * in a "pending" state, waiting for some external event. For "on-
1558 * demand" interfaces, this new state identifies the situation where the
1559 * interface is waiting for events to place it in the up state.
1562 static inline void netif_dormant_on(struct net_device *dev)
1564 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1565 linkwatch_fire_event(dev);
1569 * netif_dormant_off - set device as not dormant.
1570 * @dev: network device
1572 * Device is not in dormant state.
1574 static inline void netif_dormant_off(struct net_device *dev)
1576 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1577 linkwatch_fire_event(dev);
1581 * netif_dormant - test if carrier present
1582 * @dev: network device
1584 * Check if carrier is present on device
1586 static inline int netif_dormant(const struct net_device *dev)
1588 return test_bit(__LINK_STATE_DORMANT, &dev->state);
1593 * netif_oper_up - test if device is operational
1594 * @dev: network device
1596 * Check if carrier is operational
1598 static inline int netif_oper_up(const struct net_device *dev) {
1599 return (dev->operstate == IF_OPER_UP ||
1600 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1604 * netif_device_present - is device available or removed
1605 * @dev: network device
1607 * Check if device has not been removed from system.
1609 static inline int netif_device_present(struct net_device *dev)
1611 return test_bit(__LINK_STATE_PRESENT, &dev->state);
1614 extern void netif_device_detach(struct net_device *dev);
1616 extern void netif_device_attach(struct net_device *dev);
1619 * Network interface message level settings
1621 #define HAVE_NETIF_MSG 1
1624 NETIF_MSG_DRV = 0x0001,
1625 NETIF_MSG_PROBE = 0x0002,
1626 NETIF_MSG_LINK = 0x0004,
1627 NETIF_MSG_TIMER = 0x0008,
1628 NETIF_MSG_IFDOWN = 0x0010,
1629 NETIF_MSG_IFUP = 0x0020,
1630 NETIF_MSG_RX_ERR = 0x0040,
1631 NETIF_MSG_TX_ERR = 0x0080,
1632 NETIF_MSG_TX_QUEUED = 0x0100,
1633 NETIF_MSG_INTR = 0x0200,
1634 NETIF_MSG_TX_DONE = 0x0400,
1635 NETIF_MSG_RX_STATUS = 0x0800,
1636 NETIF_MSG_PKTDATA = 0x1000,
1637 NETIF_MSG_HW = 0x2000,
1638 NETIF_MSG_WOL = 0x4000,
1641 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
1642 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
1643 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
1644 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
1645 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
1646 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
1647 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
1648 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
1649 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1650 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
1651 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
1652 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1653 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
1654 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
1655 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
1657 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1660 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1661 return default_msg_enable_bits;
1662 if (debug_value == 0) /* no output */
1664 /* set low N bits */
1665 return (1 << debug_value) - 1;
1668 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1670 spin_lock(&txq->_xmit_lock);
1671 txq->xmit_lock_owner = cpu;
1674 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1676 spin_lock_bh(&txq->_xmit_lock);
1677 txq->xmit_lock_owner = smp_processor_id();
1680 static inline int __netif_tx_trylock(struct netdev_queue *txq)
1682 int ok = spin_trylock(&txq->_xmit_lock);
1684 txq->xmit_lock_owner = smp_processor_id();
1688 static inline void __netif_tx_unlock(struct netdev_queue *txq)
1690 txq->xmit_lock_owner = -1;
1691 spin_unlock(&txq->_xmit_lock);
1694 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1696 txq->xmit_lock_owner = -1;
1697 spin_unlock_bh(&txq->_xmit_lock);
1700 static inline void txq_trans_update(struct netdev_queue *txq)
1702 if (txq->xmit_lock_owner != -1)
1703 txq->trans_start = jiffies;
1707 * netif_tx_lock - grab network device transmit lock
1708 * @dev: network device
1710 * Get network device transmit lock
1712 static inline void netif_tx_lock(struct net_device *dev)
1717 spin_lock(&dev->tx_global_lock);
1718 cpu = smp_processor_id();
1719 for (i = 0; i < dev->num_tx_queues; i++) {
1720 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1722 /* We are the only thread of execution doing a
1723 * freeze, but we have to grab the _xmit_lock in
1724 * order to synchronize with threads which are in
1725 * the ->hard_start_xmit() handler and already
1726 * checked the frozen bit.
1728 __netif_tx_lock(txq, cpu);
1729 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1730 __netif_tx_unlock(txq);
1734 static inline void netif_tx_lock_bh(struct net_device *dev)
1740 static inline void netif_tx_unlock(struct net_device *dev)
1744 for (i = 0; i < dev->num_tx_queues; i++) {
1745 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1747 /* No need to grab the _xmit_lock here. If the
1748 * queue is not stopped for another reason, we
1751 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1752 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1753 __netif_schedule(txq->qdisc);
1755 spin_unlock(&dev->tx_global_lock);
1758 static inline void netif_tx_unlock_bh(struct net_device *dev)
1760 netif_tx_unlock(dev);
1764 #define HARD_TX_LOCK(dev, txq, cpu) { \
1765 if ((dev->features & NETIF_F_LLTX) == 0) { \
1766 __netif_tx_lock(txq, cpu); \
1770 #define HARD_TX_UNLOCK(dev, txq) { \
1771 if ((dev->features & NETIF_F_LLTX) == 0) { \
1772 __netif_tx_unlock(txq); \
1776 static inline void netif_tx_disable(struct net_device *dev)
1782 cpu = smp_processor_id();
1783 for (i = 0; i < dev->num_tx_queues; i++) {
1784 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1786 __netif_tx_lock(txq, cpu);
1787 netif_tx_stop_queue(txq);
1788 __netif_tx_unlock(txq);
1793 static inline void netif_addr_lock(struct net_device *dev)
1795 spin_lock(&dev->addr_list_lock);
1798 static inline void netif_addr_lock_bh(struct net_device *dev)
1800 spin_lock_bh(&dev->addr_list_lock);
1803 static inline void netif_addr_unlock(struct net_device *dev)
1805 spin_unlock(&dev->addr_list_lock);
1808 static inline void netif_addr_unlock_bh(struct net_device *dev)
1810 spin_unlock_bh(&dev->addr_list_lock);
1814 * dev_addrs walker. Should be used only for read access. Call with
1815 * rcu_read_lock held.
1817 #define for_each_dev_addr(dev, ha) \
1818 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
1820 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1822 extern void ether_setup(struct net_device *dev);
1824 /* Support for loadable net-drivers */
1825 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1826 void (*setup)(struct net_device *),
1827 unsigned int queue_count);
1828 #define alloc_netdev(sizeof_priv, name, setup) \
1829 alloc_netdev_mq(sizeof_priv, name, setup, 1)
1830 extern int register_netdev(struct net_device *dev);
1831 extern void unregister_netdev(struct net_device *dev);
1833 /* Functions used for device addresses handling */
1834 extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
1835 unsigned char addr_type);
1836 extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
1837 unsigned char addr_type);
1838 extern int dev_addr_add_multiple(struct net_device *to_dev,
1839 struct net_device *from_dev,
1840 unsigned char addr_type);
1841 extern int dev_addr_del_multiple(struct net_device *to_dev,
1842 struct net_device *from_dev,
1843 unsigned char addr_type);
1845 /* Functions used for secondary unicast and multicast support */
1846 extern void dev_set_rx_mode(struct net_device *dev);
1847 extern void __dev_set_rx_mode(struct net_device *dev);
1848 extern int dev_unicast_delete(struct net_device *dev, void *addr);
1849 extern int dev_unicast_add(struct net_device *dev, void *addr);
1850 extern int dev_unicast_sync(struct net_device *to, struct net_device *from);
1851 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from);
1852 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1853 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1854 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
1855 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
1856 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1857 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1858 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1859 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1860 extern int dev_set_promiscuity(struct net_device *dev, int inc);
1861 extern int dev_set_allmulti(struct net_device *dev, int inc);
1862 extern void netdev_state_change(struct net_device *dev);
1863 extern void netdev_bonding_change(struct net_device *dev);
1864 extern void netdev_features_change(struct net_device *dev);
1865 /* Load a device via the kmod */
1866 extern void dev_load(struct net *net, const char *name);
1867 extern void dev_mcast_init(void);
1868 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
1870 extern int netdev_max_backlog;
1871 extern int weight_p;
1872 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1873 extern int skb_checksum_help(struct sk_buff *skb);
1874 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1876 extern void netdev_rx_csum_fault(struct net_device *dev);
1878 static inline void netdev_rx_csum_fault(struct net_device *dev)
1882 /* rx skb timestamps */
1883 extern void net_enable_timestamp(void);
1884 extern void net_disable_timestamp(void);
1886 #ifdef CONFIG_PROC_FS
1887 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1888 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1889 extern void dev_seq_stop(struct seq_file *seq, void *v);
1892 extern int netdev_class_create_file(struct class_attribute *class_attr);
1893 extern void netdev_class_remove_file(struct class_attribute *class_attr);
1895 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1897 extern void linkwatch_run_queue(void);
1899 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
1900 unsigned long mask);
1901 unsigned long netdev_fix_features(unsigned long features, const char *name);
1903 static inline int net_gso_ok(int features, int gso_type)
1905 int feature = gso_type << NETIF_F_GSO_SHIFT;
1906 return (features & feature) == feature;
1909 static inline int skb_gso_ok(struct sk_buff *skb, int features)
1911 return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
1912 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
1915 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
1917 return skb_is_gso(skb) &&
1918 (!skb_gso_ok(skb, dev->features) ||
1919 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1922 static inline void netif_set_gso_max_size(struct net_device *dev,
1925 dev->gso_max_size = size;
1928 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
1929 struct net_device *master)
1931 if (skb->pkt_type == PACKET_HOST) {
1932 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
1934 memcpy(dest, master->dev_addr, ETH_ALEN);
1938 /* On bonding slaves other than the currently active slave, suppress
1939 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1940 * ARP on active-backup slaves with arp_validate enabled.
1942 static inline int skb_bond_should_drop(struct sk_buff *skb)
1944 struct net_device *dev = skb->dev;
1945 struct net_device *master = dev->master;
1948 if (master->priv_flags & IFF_MASTER_ARPMON)
1949 dev->last_rx = jiffies;
1951 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
1952 /* Do address unmangle. The local destination address
1953 * will be always the one master has. Provides the right
1954 * functionality in a bridge.
1956 skb_bond_set_mac_by_master(skb, master);
1959 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1960 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1961 skb->protocol == __cpu_to_be16(ETH_P_ARP))
1964 if (master->priv_flags & IFF_MASTER_ALB) {
1965 if (skb->pkt_type != PACKET_BROADCAST &&
1966 skb->pkt_type != PACKET_MULTICAST)
1969 if (master->priv_flags & IFF_MASTER_8023AD &&
1970 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
1979 extern struct pernet_operations __net_initdata loopback_net_ops;
1981 static inline int dev_ethtool_get_settings(struct net_device *dev,
1982 struct ethtool_cmd *cmd)
1984 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
1986 return dev->ethtool_ops->get_settings(dev, cmd);
1989 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
1991 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
1993 return dev->ethtool_ops->get_rx_csum(dev);
1996 static inline u32 dev_ethtool_get_flags(struct net_device *dev)
1998 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
2000 return dev->ethtool_ops->get_flags(dev);
2002 #endif /* __KERNEL__ */
2004 #endif /* _LINUX_NETDEVICE_H */