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 /* Backlog congestion levels */
67 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
68 #define NET_RX_DROP 1 /* packet dropped */
71 * Transmit return codes: transmit return codes originate from three different
74 * - qdisc return codes
75 * - driver transmit return codes
78 * Drivers are allowed to return any one of those in their hard_start_xmit()
79 * function. Real network devices commonly used with qdiscs should only return
80 * the driver transmit return codes though - when qdiscs are used, the actual
81 * transmission happens asynchronously, so the value is not propagated to
82 * higher layers. Virtual network devices transmit synchronously, in this case
83 * the driver transmit return codes are consumed by dev_queue_xmit(), all
84 * others are propagated to higher layers.
87 /* qdisc ->enqueue() return codes. */
88 #define NET_XMIT_SUCCESS 0x00
89 #define NET_XMIT_DROP 0x01 /* skb dropped */
90 #define NET_XMIT_CN 0x02 /* congestion notification */
91 #define NET_XMIT_POLICED 0x03 /* skb is shot by police */
92 #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */
94 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
95 * indicates that the device will soon be dropping packets, or already drops
96 * some packets of the same priority; prompting us to send less aggressively. */
97 #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e))
98 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
100 /* Driver transmit return codes */
101 #define NETDEV_TX_MASK 0xf0
104 __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */
105 NETDEV_TX_OK = 0x00, /* driver took care of packet */
106 NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/
107 NETDEV_TX_LOCKED = 0x20, /* driver tx lock was already taken */
109 typedef enum netdev_tx netdev_tx_t;
112 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
113 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
115 static inline bool dev_xmit_complete(int rc)
118 * Positive cases with an skb consumed by a driver:
119 * - successful transmission (rc == NETDEV_TX_OK)
120 * - error while transmitting (rc < 0)
121 * - error while queueing to a different device (rc & NET_XMIT_MASK)
123 if (likely(rc < NET_XMIT_MASK))
131 #define MAX_ADDR_LEN 32 /* Largest hardware address length */
135 * Compute the worst case header length according to the protocols
139 #if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
140 # if defined(CONFIG_MAC80211_MESH)
141 # define LL_MAX_HEADER 128
143 # define LL_MAX_HEADER 96
145 #elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
146 # define LL_MAX_HEADER 48
148 # define LL_MAX_HEADER 32
151 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
152 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \
153 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
154 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
155 #define MAX_HEADER LL_MAX_HEADER
157 #define MAX_HEADER (LL_MAX_HEADER + 48)
160 #endif /* __KERNEL__ */
163 * Network device statistics. Akin to the 2.0 ether stats but
164 * with byte counters.
167 struct net_device_stats {
168 unsigned long rx_packets; /* total packets received */
169 unsigned long tx_packets; /* total packets transmitted */
170 unsigned long rx_bytes; /* total bytes received */
171 unsigned long tx_bytes; /* total bytes transmitted */
172 unsigned long rx_errors; /* bad packets received */
173 unsigned long tx_errors; /* packet transmit problems */
174 unsigned long rx_dropped; /* no space in linux buffers */
175 unsigned long tx_dropped; /* no space available in linux */
176 unsigned long multicast; /* multicast packets received */
177 unsigned long collisions;
179 /* detailed rx_errors: */
180 unsigned long rx_length_errors;
181 unsigned long rx_over_errors; /* receiver ring buff overflow */
182 unsigned long rx_crc_errors; /* recved pkt with crc error */
183 unsigned long rx_frame_errors; /* recv'd frame alignment error */
184 unsigned long rx_fifo_errors; /* recv'r fifo overrun */
185 unsigned long rx_missed_errors; /* receiver missed packet */
187 /* detailed tx_errors */
188 unsigned long tx_aborted_errors;
189 unsigned long tx_carrier_errors;
190 unsigned long tx_fifo_errors;
191 unsigned long tx_heartbeat_errors;
192 unsigned long tx_window_errors;
195 unsigned long rx_compressed;
196 unsigned long tx_compressed;
200 /* Media selection options. */
213 #include <linux/cache.h>
214 #include <linux/skbuff.h>
220 struct netif_rx_stats {
223 unsigned time_squeeze;
224 unsigned cpu_collision;
227 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
229 struct dev_addr_list {
230 struct dev_addr_list *next;
231 u8 da_addr[MAX_ADDR_LEN];
239 * We tag multicasts with these structures.
242 #define dev_mc_list dev_addr_list
243 #define dmi_addr da_addr
244 #define dmi_addrlen da_addrlen
245 #define dmi_users da_users
246 #define dmi_gusers da_gusers
248 struct netdev_hw_addr {
249 struct list_head list;
250 unsigned char addr[MAX_ADDR_LEN];
252 #define NETDEV_HW_ADDR_T_LAN 1
253 #define NETDEV_HW_ADDR_T_SAN 2
254 #define NETDEV_HW_ADDR_T_SLAVE 3
255 #define NETDEV_HW_ADDR_T_UNICAST 4
258 struct rcu_head rcu_head;
261 struct netdev_hw_addr_list {
262 struct list_head list;
266 #define netdev_uc_count(dev) ((dev)->uc.count)
267 #define netdev_uc_empty(dev) ((dev)->uc.count == 0)
268 #define netdev_for_each_uc_addr(ha, dev) \
269 list_for_each_entry(ha, &dev->uc.list, list)
271 #define netdev_mc_count(dev) ((dev)->mc_count)
272 #define netdev_mc_empty(dev) (netdev_mc_count(dev) == 0)
274 #define netdev_for_each_mc_addr(mclist, dev) \
275 for (mclist = dev->mc_list; mclist; mclist = mclist->next)
278 struct hh_cache *hh_next; /* Next entry */
279 atomic_t hh_refcnt; /* number of users */
281 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
283 * They are mostly read, but hh_refcnt may be changed quite frequently,
284 * incurring cache line ping pongs.
286 __be16 hh_type ____cacheline_aligned_in_smp;
287 /* protocol identifier, f.e ETH_P_IP
288 * NOTE: For VLANs, this will be the
289 * encapuslated type. --BLG
291 u16 hh_len; /* length of header */
292 int (*hh_output)(struct sk_buff *skb);
295 /* cached hardware header; allow for machine alignment needs. */
296 #define HH_DATA_MOD 16
297 #define HH_DATA_OFF(__len) \
298 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
299 #define HH_DATA_ALIGN(__len) \
300 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
301 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
304 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
306 * dev->hard_header_len ? (dev->hard_header_len +
307 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
309 * We could use other alignment values, but we must maintain the
310 * relationship HH alignment <= LL alignment.
312 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
315 #define LL_RESERVED_SPACE(dev) \
316 ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
317 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
318 ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
319 #define LL_ALLOCATED_SPACE(dev) \
320 ((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
323 int (*create) (struct sk_buff *skb, struct net_device *dev,
324 unsigned short type, const void *daddr,
325 const void *saddr, unsigned len);
326 int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
327 int (*rebuild)(struct sk_buff *skb);
328 #define HAVE_HEADER_CACHE
329 int (*cache)(const struct neighbour *neigh, struct hh_cache *hh);
330 void (*cache_update)(struct hh_cache *hh,
331 const struct net_device *dev,
332 const unsigned char *haddr);
335 /* These flag bits are private to the generic network queueing
336 * layer, they may not be explicitly referenced by any other
340 enum netdev_state_t {
342 __LINK_STATE_PRESENT,
343 __LINK_STATE_NOCARRIER,
344 __LINK_STATE_LINKWATCH_PENDING,
345 __LINK_STATE_DORMANT,
350 * This structure holds at boot time configured netdevice settings. They
351 * are then used in the device probing.
353 struct netdev_boot_setup {
357 #define NETDEV_BOOT_SETUP_MAX 8
359 extern int __init netdev_boot_setup(char *str);
362 * Structure for NAPI scheduling similar to tasklet but with weighting
365 /* The poll_list must only be managed by the entity which
366 * changes the state of the NAPI_STATE_SCHED bit. This means
367 * whoever atomically sets that bit can add this napi_struct
368 * to the per-cpu poll_list, and whoever clears that bit
369 * can remove from the list right before clearing the bit.
371 struct list_head poll_list;
375 int (*poll)(struct napi_struct *, int);
376 #ifdef CONFIG_NETPOLL
377 spinlock_t poll_lock;
381 unsigned int gro_count;
383 struct net_device *dev;
384 struct list_head dev_list;
385 struct sk_buff *gro_list;
390 NAPI_STATE_SCHED, /* Poll is scheduled */
391 NAPI_STATE_DISABLE, /* Disable pending */
392 NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
402 typedef enum gro_result gro_result_t;
404 extern void __napi_schedule(struct napi_struct *n);
406 static inline int napi_disable_pending(struct napi_struct *n)
408 return test_bit(NAPI_STATE_DISABLE, &n->state);
412 * napi_schedule_prep - check if napi can be scheduled
415 * Test if NAPI routine is already running, and if not mark
416 * it as running. This is used as a condition variable
417 * insure only one NAPI poll instance runs. We also make
418 * sure there is no pending NAPI disable.
420 static inline int napi_schedule_prep(struct napi_struct *n)
422 return !napi_disable_pending(n) &&
423 !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
427 * napi_schedule - schedule NAPI poll
430 * Schedule NAPI poll routine to be called if it is not already
433 static inline void napi_schedule(struct napi_struct *n)
435 if (napi_schedule_prep(n))
439 /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
440 static inline int napi_reschedule(struct napi_struct *napi)
442 if (napi_schedule_prep(napi)) {
443 __napi_schedule(napi);
450 * napi_complete - NAPI processing complete
453 * Mark NAPI processing as complete.
455 extern void __napi_complete(struct napi_struct *n);
456 extern void napi_complete(struct napi_struct *n);
459 * napi_disable - prevent NAPI from scheduling
462 * Stop NAPI from being scheduled on this context.
463 * Waits till any outstanding processing completes.
465 static inline void napi_disable(struct napi_struct *n)
467 set_bit(NAPI_STATE_DISABLE, &n->state);
468 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
470 clear_bit(NAPI_STATE_DISABLE, &n->state);
474 * napi_enable - enable NAPI scheduling
477 * Resume NAPI from being scheduled on this context.
478 * Must be paired with napi_disable.
480 static inline void napi_enable(struct napi_struct *n)
482 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
483 smp_mb__before_clear_bit();
484 clear_bit(NAPI_STATE_SCHED, &n->state);
489 * napi_synchronize - wait until NAPI is not running
492 * Wait until NAPI is done being scheduled on this context.
493 * Waits till any outstanding processing completes but
494 * does not disable future activations.
496 static inline void napi_synchronize(const struct napi_struct *n)
498 while (test_bit(NAPI_STATE_SCHED, &n->state))
502 # define napi_synchronize(n) barrier()
505 enum netdev_queue_state_t {
507 __QUEUE_STATE_FROZEN,
510 struct netdev_queue {
514 struct net_device *dev;
517 struct Qdisc *qdisc_sleeping;
521 spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
524 * please use this field instead of dev->trans_start
526 unsigned long trans_start;
527 unsigned long tx_bytes;
528 unsigned long tx_packets;
529 unsigned long tx_dropped;
530 } ____cacheline_aligned_in_smp;
534 * This structure defines the management hooks for network devices.
535 * The following hooks can be defined; unless noted otherwise, they are
536 * optional and can be filled with a null pointer.
538 * int (*ndo_init)(struct net_device *dev);
539 * This function is called once when network device is registered.
540 * The network device can use this to any late stage initializaton
541 * or semantic validattion. It can fail with an error code which will
542 * be propogated back to register_netdev
544 * void (*ndo_uninit)(struct net_device *dev);
545 * This function is called when device is unregistered or when registration
546 * fails. It is not called if init fails.
548 * int (*ndo_open)(struct net_device *dev);
549 * This function is called when network device transistions to the up
552 * int (*ndo_stop)(struct net_device *dev);
553 * This function is called when network device transistions to the down
556 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
557 * struct net_device *dev);
558 * Called when a packet needs to be transmitted.
559 * Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
560 * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
561 * Required can not be NULL.
563 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
564 * Called to decide which queue to when device supports multiple
567 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
568 * This function is called to allow device receiver to make
569 * changes to configuration when multicast or promiscious is enabled.
571 * void (*ndo_set_rx_mode)(struct net_device *dev);
572 * This function is called device changes address list filtering.
574 * void (*ndo_set_multicast_list)(struct net_device *dev);
575 * This function is called when the multicast address list changes.
577 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
578 * This function is called when the Media Access Control address
579 * needs to be changed. If this interface is not defined, the
580 * mac address can not be changed.
582 * int (*ndo_validate_addr)(struct net_device *dev);
583 * Test if Media Access Control address is valid for the device.
585 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
586 * Called when a user request an ioctl which can't be handled by
587 * the generic interface code. If not defined ioctl's return
588 * not supported error code.
590 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
591 * Used to set network devices bus interface parameters. This interface
592 * is retained for legacy reason, new devices should use the bus
593 * interface (PCI) for low level management.
595 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
596 * Called when a user wants to change the Maximum Transfer Unit
597 * of a device. If not defined, any request to change MTU will
598 * will return an error.
600 * void (*ndo_tx_timeout)(struct net_device *dev);
601 * Callback uses when the transmitter has not made any progress
602 * for dev->watchdog ticks.
604 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
605 * Called when a user wants to get the network device usage
606 * statistics. If not defined, the counters in dev->stats will
609 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
610 * If device support VLAN receive accleration
611 * (ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
612 * when vlan groups for the device changes. Note: grp is NULL
613 * if no vlan's groups are being used.
615 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
616 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
617 * this function is called when a VLAN id is registered.
619 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
620 * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
621 * this function is called when a VLAN id is unregistered.
623 * void (*ndo_poll_controller)(struct net_device *dev);
625 #define HAVE_NET_DEVICE_OPS
626 struct net_device_ops {
627 int (*ndo_init)(struct net_device *dev);
628 void (*ndo_uninit)(struct net_device *dev);
629 int (*ndo_open)(struct net_device *dev);
630 int (*ndo_stop)(struct net_device *dev);
631 netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb,
632 struct net_device *dev);
633 u16 (*ndo_select_queue)(struct net_device *dev,
634 struct sk_buff *skb);
635 void (*ndo_change_rx_flags)(struct net_device *dev,
637 void (*ndo_set_rx_mode)(struct net_device *dev);
638 void (*ndo_set_multicast_list)(struct net_device *dev);
639 int (*ndo_set_mac_address)(struct net_device *dev,
641 int (*ndo_validate_addr)(struct net_device *dev);
642 int (*ndo_do_ioctl)(struct net_device *dev,
643 struct ifreq *ifr, int cmd);
644 int (*ndo_set_config)(struct net_device *dev,
646 int (*ndo_change_mtu)(struct net_device *dev,
648 int (*ndo_neigh_setup)(struct net_device *dev,
649 struct neigh_parms *);
650 void (*ndo_tx_timeout) (struct net_device *dev);
652 struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
654 void (*ndo_vlan_rx_register)(struct net_device *dev,
655 struct vlan_group *grp);
656 void (*ndo_vlan_rx_add_vid)(struct net_device *dev,
658 void (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
660 #ifdef CONFIG_NET_POLL_CONTROLLER
661 void (*ndo_poll_controller)(struct net_device *dev);
663 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
664 int (*ndo_fcoe_enable)(struct net_device *dev);
665 int (*ndo_fcoe_disable)(struct net_device *dev);
666 int (*ndo_fcoe_ddp_setup)(struct net_device *dev,
668 struct scatterlist *sgl,
670 int (*ndo_fcoe_ddp_done)(struct net_device *dev,
672 #define NETDEV_FCOE_WWNN 0
673 #define NETDEV_FCOE_WWPN 1
674 int (*ndo_fcoe_get_wwn)(struct net_device *dev,
680 * The DEVICE structure.
681 * Actually, this whole structure is a big mistake. It mixes I/O
682 * data with strictly "high-level" data, and it has to know about
683 * almost every data structure used in the INET module.
685 * FIXME: cleanup struct net_device such that network protocol info
692 * This is the first field of the "visible" part of this structure
693 * (i.e. as seen by users in the "Space.c" file). It is the name
697 /* device name hash chain */
698 struct hlist_node name_hlist;
703 * I/O specific fields
704 * FIXME: Merge these and struct ifmap into one
706 unsigned long mem_end; /* shared mem end */
707 unsigned long mem_start; /* shared mem start */
708 unsigned long base_addr; /* device I/O address */
709 unsigned int irq; /* device IRQ number */
712 * Some hardware also needs these fields, but they are not
713 * part of the usual set specified in Space.c.
716 unsigned char if_port; /* Selectable AUI, TP,..*/
717 unsigned char dma; /* DMA channel */
721 struct list_head dev_list;
722 struct list_head napi_list;
723 struct list_head unreg_list;
725 /* Net device features */
726 unsigned long features;
727 #define NETIF_F_SG 1 /* Scatter/gather IO. */
728 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
729 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
730 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
731 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
732 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
733 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
734 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
735 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
736 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
737 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
738 #define NETIF_F_GSO 2048 /* Enable software GSO. */
739 #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */
740 /* do not use LLTX in new drivers */
741 #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
742 #define NETIF_F_GRO 16384 /* Generic receive offload */
743 #define NETIF_F_LRO 32768 /* large receive offload */
745 /* the GSO_MASK reserves bits 16 through 23 */
746 #define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */
747 #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */
748 #define NETIF_F_FCOE_MTU (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
750 /* Segmentation offload features */
751 #define NETIF_F_GSO_SHIFT 16
752 #define NETIF_F_GSO_MASK 0x00ff0000
753 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
754 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
755 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
756 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
757 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
758 #define NETIF_F_FSO (SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
760 /* List of features with software fallbacks. */
761 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
764 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
765 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
766 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
767 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
770 * If one device supports one of these features, then enable them
771 * for all in netdev_increment_features.
773 #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
774 NETIF_F_SG | NETIF_F_HIGHDMA | \
777 /* Interface index. Unique device identifier */
781 struct net_device_stats stats;
783 #ifdef CONFIG_WIRELESS_EXT
784 /* List of functions to handle Wireless Extensions (instead of ioctl).
785 * See <net/iw_handler.h> for details. Jean II */
786 const struct iw_handler_def * wireless_handlers;
787 /* Instance data managed by the core of Wireless Extensions. */
788 struct iw_public_data * wireless_data;
790 /* Management operations */
791 const struct net_device_ops *netdev_ops;
792 const struct ethtool_ops *ethtool_ops;
794 /* Hardware header description */
795 const struct header_ops *header_ops;
797 unsigned int flags; /* interface flags (a la BSD) */
798 unsigned short gflags;
799 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
800 unsigned short padded; /* How much padding added by alloc_netdev() */
802 unsigned char operstate; /* RFC2863 operstate */
803 unsigned char link_mode; /* mapping policy to operstate */
805 unsigned mtu; /* interface MTU value */
806 unsigned short type; /* interface hardware type */
807 unsigned short hard_header_len; /* hardware hdr length */
809 /* extra head- and tailroom the hardware may need, but not in all cases
810 * can this be guaranteed, especially tailroom. Some cases also use
811 * LL_MAX_HEADER instead to allocate the skb.
813 unsigned short needed_headroom;
814 unsigned short needed_tailroom;
816 struct net_device *master; /* Pointer to master device of a group,
817 * which this device is member of.
820 /* Interface address info. */
821 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
822 unsigned char addr_len; /* hardware address length */
823 unsigned short dev_id; /* for shared network cards */
825 struct netdev_hw_addr_list uc; /* Secondary unicast
828 spinlock_t addr_list_lock;
829 struct dev_addr_list *mc_list; /* Multicast mac addresses */
830 int mc_count; /* Number of installed mcasts */
831 unsigned int promiscuity;
832 unsigned int allmulti;
835 /* Protocol specific pointers */
837 #ifdef CONFIG_NET_DSA
838 void *dsa_ptr; /* dsa specific data */
840 void *atalk_ptr; /* AppleTalk link */
841 void *ip_ptr; /* IPv4 specific data */
842 void *dn_ptr; /* DECnet specific data */
843 void *ip6_ptr; /* IPv6 specific data */
844 void *ec_ptr; /* Econet specific data */
845 void *ax25_ptr; /* AX.25 specific data */
846 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
847 assign before registering */
850 * Cache line mostly used on receive path (including eth_type_trans())
852 unsigned long last_rx; /* Time of last Rx */
853 /* Interface address info used in eth_type_trans() */
854 unsigned char *dev_addr; /* hw address, (before bcast
855 because most packets are
858 struct netdev_hw_addr_list dev_addrs; /* list of device
861 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
863 struct netdev_queue rx_queue;
865 struct netdev_queue *_tx ____cacheline_aligned_in_smp;
867 /* Number of TX queues allocated at alloc_netdev_mq() time */
868 unsigned int num_tx_queues;
870 /* Number of TX queues currently active in device */
871 unsigned int real_num_tx_queues;
873 /* root qdisc from userspace point of view */
876 unsigned long tx_queue_len; /* Max frames per queue allowed */
877 spinlock_t tx_global_lock;
879 * One part is mostly used on xmit path (device)
881 /* These may be needed for future network-power-down code. */
884 * trans_start here is expensive for high speed devices on SMP,
885 * please use netdev_queue->trans_start instead.
887 unsigned long trans_start; /* Time (in jiffies) of last Tx */
889 int watchdog_timeo; /* used by dev_watchdog() */
890 struct timer_list watchdog_timer;
892 /* Number of references to this device */
893 atomic_t refcnt ____cacheline_aligned_in_smp;
895 /* delayed register/unregister */
896 struct list_head todo_list;
897 /* device index hash chain */
898 struct hlist_node index_hlist;
900 struct list_head link_watch_list;
902 /* register/unregister state machine */
903 enum { NETREG_UNINITIALIZED=0,
904 NETREG_REGISTERED, /* completed register_netdevice */
905 NETREG_UNREGISTERING, /* called unregister_netdevice */
906 NETREG_UNREGISTERED, /* completed unregister todo */
907 NETREG_RELEASED, /* called free_netdev */
908 NETREG_DUMMY, /* dummy device for NAPI poll */
911 /* Called from unregister, can be used to call free_netdev */
912 void (*destructor)(struct net_device *dev);
914 #ifdef CONFIG_NETPOLL
915 struct netpoll_info *npinfo;
919 /* Network namespace this network device is inside */
923 /* mid-layer private */
927 struct net_bridge_port *br_port;
929 struct macvlan_port *macvlan_port;
931 struct garp_port *garp_port;
933 /* class/net/name entry */
935 /* space for optional device, statistics, and wireless sysfs groups */
936 const struct attribute_group *sysfs_groups[4];
938 /* rtnetlink link ops */
939 const struct rtnl_link_ops *rtnl_link_ops;
941 /* VLAN feature mask */
942 unsigned long vlan_features;
944 /* for setting kernel sock attribute on TCP connection setup */
945 #define GSO_MAX_SIZE 65536
946 unsigned int gso_max_size;
949 /* Data Center Bridging netlink ops */
950 const struct dcbnl_rtnl_ops *dcbnl_ops;
953 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
954 /* max exchange id for FCoE LRO by ddp */
955 unsigned int fcoe_ddp_xid;
958 #define to_net_dev(d) container_of(d, struct net_device, dev)
960 #define NETDEV_ALIGN 32
963 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
966 return &dev->_tx[index];
969 static inline void netdev_for_each_tx_queue(struct net_device *dev,
970 void (*f)(struct net_device *,
971 struct netdev_queue *,
977 for (i = 0; i < dev->num_tx_queues; i++)
978 f(dev, &dev->_tx[i], arg);
982 * Net namespace inlines
985 struct net *dev_net(const struct net_device *dev)
995 void dev_net_set(struct net_device *dev, struct net *net)
998 release_net(dev->nd_net);
999 dev->nd_net = hold_net(net);
1003 static inline bool netdev_uses_dsa_tags(struct net_device *dev)
1005 #ifdef CONFIG_NET_DSA_TAG_DSA
1006 if (dev->dsa_ptr != NULL)
1007 return dsa_uses_dsa_tags(dev->dsa_ptr);
1013 #ifndef CONFIG_NET_NS
1014 static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1018 #else /* CONFIG_NET_NS */
1019 void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
1022 static inline bool netdev_uses_trailer_tags(struct net_device *dev)
1024 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1025 if (dev->dsa_ptr != NULL)
1026 return dsa_uses_trailer_tags(dev->dsa_ptr);
1033 * netdev_priv - access network device private data
1034 * @dev: network device
1036 * Get network device private data
1038 static inline void *netdev_priv(const struct net_device *dev)
1040 return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
1043 /* Set the sysfs physical device reference for the network logical device
1044 * if set prior to registration will cause a symlink during initialization.
1046 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
1048 /* Set the sysfs device type for the network logical device to allow
1049 * fin grained indentification of different network device types. For
1050 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
1052 #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype))
1055 * netif_napi_add - initialize a napi context
1056 * @dev: network device
1057 * @napi: napi context
1058 * @poll: polling function
1059 * @weight: default weight
1061 * netif_napi_add() must be used to initialize a napi context prior to calling
1062 * *any* of the other napi related functions.
1064 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
1065 int (*poll)(struct napi_struct *, int), int weight);
1068 * netif_napi_del - remove a napi context
1069 * @napi: napi context
1071 * netif_napi_del() removes a napi context from the network device napi list
1073 void netif_napi_del(struct napi_struct *napi);
1075 struct napi_gro_cb {
1076 /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
1079 /* Length of frag0. */
1080 unsigned int frag0_len;
1082 /* This indicates where we are processing relative to skb->data. */
1085 /* This is non-zero if the packet may be of the same flow. */
1088 /* This is non-zero if the packet cannot be merged with the new skb. */
1091 /* Number of segments aggregated. */
1098 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1100 struct packet_type {
1101 __be16 type; /* This is really htons(ether_type). */
1102 struct net_device *dev; /* NULL is wildcarded here */
1103 int (*func) (struct sk_buff *,
1104 struct net_device *,
1105 struct packet_type *,
1106 struct net_device *);
1107 struct sk_buff *(*gso_segment)(struct sk_buff *skb,
1109 int (*gso_send_check)(struct sk_buff *skb);
1110 struct sk_buff **(*gro_receive)(struct sk_buff **head,
1111 struct sk_buff *skb);
1112 int (*gro_complete)(struct sk_buff *skb);
1113 void *af_packet_priv;
1114 struct list_head list;
1117 #include <linux/interrupt.h>
1118 #include <linux/notifier.h>
1120 extern rwlock_t dev_base_lock; /* Device list lock */
1123 #define for_each_netdev(net, d) \
1124 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1125 #define for_each_netdev_reverse(net, d) \
1126 list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1127 #define for_each_netdev_rcu(net, d) \
1128 list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1129 #define for_each_netdev_safe(net, d, n) \
1130 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
1131 #define for_each_netdev_continue(net, d) \
1132 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
1133 #define for_each_netdev_continue_rcu(net, d) \
1134 list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1135 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
1137 static inline struct net_device *next_net_device(struct net_device *dev)
1139 struct list_head *lh;
1143 lh = dev->dev_list.next;
1144 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1147 static inline struct net_device *next_net_device_rcu(struct net_device *dev)
1149 struct list_head *lh;
1153 lh = rcu_dereference(dev->dev_list.next);
1154 return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
1157 static inline struct net_device *first_net_device(struct net *net)
1159 return list_empty(&net->dev_base_head) ? NULL :
1160 net_device_entry(net->dev_base_head.next);
1163 extern int netdev_boot_setup_check(struct net_device *dev);
1164 extern unsigned long netdev_boot_base(const char *prefix, int unit);
1165 extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
1166 extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
1167 extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
1168 extern void dev_add_pack(struct packet_type *pt);
1169 extern void dev_remove_pack(struct packet_type *pt);
1170 extern void __dev_remove_pack(struct packet_type *pt);
1172 extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags,
1173 unsigned short mask);
1174 extern struct net_device *dev_get_by_name(struct net *net, const char *name);
1175 extern struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
1176 extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
1177 extern int dev_alloc_name(struct net_device *dev, const char *name);
1178 extern int dev_open(struct net_device *dev);
1179 extern int dev_close(struct net_device *dev);
1180 extern void dev_disable_lro(struct net_device *dev);
1181 extern int dev_queue_xmit(struct sk_buff *skb);
1182 extern int register_netdevice(struct net_device *dev);
1183 extern void unregister_netdevice_queue(struct net_device *dev,
1184 struct list_head *head);
1185 extern void unregister_netdevice_many(struct list_head *head);
1186 static inline void unregister_netdevice(struct net_device *dev)
1188 unregister_netdevice_queue(dev, NULL);
1191 extern void free_netdev(struct net_device *dev);
1192 extern void synchronize_net(void);
1193 extern int register_netdevice_notifier(struct notifier_block *nb);
1194 extern int unregister_netdevice_notifier(struct notifier_block *nb);
1195 extern int init_dummy_netdev(struct net_device *dev);
1196 extern void netdev_resync_ops(struct net_device *dev);
1198 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1199 extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
1200 extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
1201 extern struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
1202 extern int dev_restart(struct net_device *dev);
1203 #ifdef CONFIG_NETPOLL_TRAP
1204 extern int netpoll_trap(void);
1206 extern int skb_gro_receive(struct sk_buff **head,
1207 struct sk_buff *skb);
1208 extern void skb_gro_reset_offset(struct sk_buff *skb);
1210 static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
1212 return NAPI_GRO_CB(skb)->data_offset;
1215 static inline unsigned int skb_gro_len(const struct sk_buff *skb)
1217 return skb->len - NAPI_GRO_CB(skb)->data_offset;
1220 static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
1222 NAPI_GRO_CB(skb)->data_offset += len;
1225 static inline void *skb_gro_header_fast(struct sk_buff *skb,
1226 unsigned int offset)
1228 return NAPI_GRO_CB(skb)->frag0 + offset;
1231 static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
1233 return NAPI_GRO_CB(skb)->frag0_len < hlen;
1236 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
1237 unsigned int offset)
1239 NAPI_GRO_CB(skb)->frag0 = NULL;
1240 NAPI_GRO_CB(skb)->frag0_len = 0;
1241 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1244 static inline void *skb_gro_mac_header(struct sk_buff *skb)
1246 return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1249 static inline void *skb_gro_network_header(struct sk_buff *skb)
1251 return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
1252 skb_network_offset(skb);
1255 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
1256 unsigned short type,
1257 const void *daddr, const void *saddr,
1260 if (!dev->header_ops || !dev->header_ops->create)
1263 return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1266 static inline int dev_parse_header(const struct sk_buff *skb,
1267 unsigned char *haddr)
1269 const struct net_device *dev = skb->dev;
1271 if (!dev->header_ops || !dev->header_ops->parse)
1273 return dev->header_ops->parse(skb, haddr);
1276 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1277 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
1278 static inline int unregister_gifconf(unsigned int family)
1280 return register_gifconf(family, NULL);
1284 * Incoming packets are placed on per-cpu queues so that
1285 * no locking is needed.
1287 struct softnet_data {
1288 struct Qdisc *output_queue;
1289 struct sk_buff_head input_pkt_queue;
1290 struct list_head poll_list;
1291 struct sk_buff *completion_queue;
1293 struct napi_struct backlog;
1296 DECLARE_PER_CPU(struct softnet_data,softnet_data);
1298 #define HAVE_NETIF_QUEUE
1300 extern void __netif_schedule(struct Qdisc *q);
1302 static inline void netif_schedule_queue(struct netdev_queue *txq)
1304 if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1305 __netif_schedule(txq->qdisc);
1308 static inline void netif_tx_schedule_all(struct net_device *dev)
1312 for (i = 0; i < dev->num_tx_queues; i++)
1313 netif_schedule_queue(netdev_get_tx_queue(dev, i));
1316 static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
1318 clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1322 * netif_start_queue - allow transmit
1323 * @dev: network device
1325 * Allow upper layers to call the device hard_start_xmit routine.
1327 static inline void netif_start_queue(struct net_device *dev)
1329 netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
1332 static inline void netif_tx_start_all_queues(struct net_device *dev)
1336 for (i = 0; i < dev->num_tx_queues; i++) {
1337 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1338 netif_tx_start_queue(txq);
1342 static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
1344 #ifdef CONFIG_NETPOLL_TRAP
1345 if (netpoll_trap()) {
1346 netif_tx_start_queue(dev_queue);
1350 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1351 __netif_schedule(dev_queue->qdisc);
1355 * netif_wake_queue - restart transmit
1356 * @dev: network device
1358 * Allow upper layers to call the device hard_start_xmit routine.
1359 * Used for flow control when transmit resources are available.
1361 static inline void netif_wake_queue(struct net_device *dev)
1363 netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
1366 static inline void netif_tx_wake_all_queues(struct net_device *dev)
1370 for (i = 0; i < dev->num_tx_queues; i++) {
1371 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1372 netif_tx_wake_queue(txq);
1376 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
1378 set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1382 * netif_stop_queue - stop transmitted packets
1383 * @dev: network device
1385 * Stop upper layers calling the device hard_start_xmit routine.
1386 * Used for flow control when transmit resources are unavailable.
1388 static inline void netif_stop_queue(struct net_device *dev)
1390 netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
1393 static inline void netif_tx_stop_all_queues(struct net_device *dev)
1397 for (i = 0; i < dev->num_tx_queues; i++) {
1398 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1399 netif_tx_stop_queue(txq);
1403 static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1405 return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
1409 * netif_queue_stopped - test if transmit queue is flowblocked
1410 * @dev: network device
1412 * Test if transmit queue on device is currently unable to send.
1414 static inline int netif_queue_stopped(const struct net_device *dev)
1416 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
1419 static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
1421 return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
1425 * netif_running - test if up
1426 * @dev: network device
1428 * Test if the device has been brought up.
1430 static inline int netif_running(const struct net_device *dev)
1432 return test_bit(__LINK_STATE_START, &dev->state);
1436 * Routines to manage the subqueues on a device. We only need start
1437 * stop, and a check if it's stopped. All other device management is
1438 * done at the overall netdevice level.
1439 * Also test the device if we're multiqueue.
1443 * netif_start_subqueue - allow sending packets on subqueue
1444 * @dev: network device
1445 * @queue_index: sub queue index
1447 * Start individual transmit queue of a device with multiple transmit queues.
1449 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
1451 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1453 netif_tx_start_queue(txq);
1457 * netif_stop_subqueue - stop sending packets on subqueue
1458 * @dev: network device
1459 * @queue_index: sub queue index
1461 * Stop individual transmit queue of a device with multiple transmit queues.
1463 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
1465 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1466 #ifdef CONFIG_NETPOLL_TRAP
1470 netif_tx_stop_queue(txq);
1474 * netif_subqueue_stopped - test status of subqueue
1475 * @dev: network device
1476 * @queue_index: sub queue index
1478 * Check individual transmit queue of a device with multiple transmit queues.
1480 static inline int __netif_subqueue_stopped(const struct net_device *dev,
1483 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1485 return netif_tx_queue_stopped(txq);
1488 static inline int netif_subqueue_stopped(const struct net_device *dev,
1489 struct sk_buff *skb)
1491 return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
1495 * netif_wake_subqueue - allow sending packets on subqueue
1496 * @dev: network device
1497 * @queue_index: sub queue index
1499 * Resume individual transmit queue of a device with multiple transmit queues.
1501 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
1503 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1504 #ifdef CONFIG_NETPOLL_TRAP
1508 if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1509 __netif_schedule(txq->qdisc);
1513 * netif_is_multiqueue - test if device has multiple transmit queues
1514 * @dev: network device
1516 * Check if device has multiple transmit queues
1518 static inline int netif_is_multiqueue(const struct net_device *dev)
1520 return (dev->num_tx_queues > 1);
1523 /* Use this variant when it is known for sure that it
1524 * is executing from hardware interrupt context or with hardware interrupts
1527 extern void dev_kfree_skb_irq(struct sk_buff *skb);
1529 /* Use this variant in places where it could be invoked
1530 * from either hardware interrupt or other context, with hardware interrupts
1531 * either disabled or enabled.
1533 extern void dev_kfree_skb_any(struct sk_buff *skb);
1535 #define HAVE_NETIF_RX 1
1536 extern int netif_rx(struct sk_buff *skb);
1537 extern int netif_rx_ni(struct sk_buff *skb);
1538 #define HAVE_NETIF_RECEIVE_SKB 1
1539 extern int netif_receive_skb(struct sk_buff *skb);
1540 extern gro_result_t dev_gro_receive(struct napi_struct *napi,
1541 struct sk_buff *skb);
1542 extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
1543 extern gro_result_t napi_gro_receive(struct napi_struct *napi,
1544 struct sk_buff *skb);
1545 extern void napi_reuse_skb(struct napi_struct *napi,
1546 struct sk_buff *skb);
1547 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
1548 extern gro_result_t napi_frags_finish(struct napi_struct *napi,
1549 struct sk_buff *skb,
1551 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
1552 extern gro_result_t napi_gro_frags(struct napi_struct *napi);
1554 static inline void napi_free_frags(struct napi_struct *napi)
1556 kfree_skb(napi->skb);
1560 extern void netif_nit_deliver(struct sk_buff *skb);
1561 extern int dev_valid_name(const char *name);
1562 extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
1563 extern int dev_ethtool(struct net *net, struct ifreq *);
1564 extern unsigned dev_get_flags(const struct net_device *);
1565 extern int dev_change_flags(struct net_device *, unsigned);
1566 extern int dev_change_name(struct net_device *, const char *);
1567 extern int dev_set_alias(struct net_device *, const char *, size_t);
1568 extern int dev_change_net_namespace(struct net_device *,
1569 struct net *, const char *);
1570 extern int dev_set_mtu(struct net_device *, int);
1571 extern int dev_set_mac_address(struct net_device *,
1573 extern int dev_hard_start_xmit(struct sk_buff *skb,
1574 struct net_device *dev,
1575 struct netdev_queue *txq);
1576 extern int dev_forward_skb(struct net_device *dev,
1577 struct sk_buff *skb);
1579 extern int netdev_budget;
1581 /* Called by rtnetlink.c:rtnl_unlock() */
1582 extern void netdev_run_todo(void);
1585 * dev_put - release reference to device
1586 * @dev: network device
1588 * Release reference to device to allow it to be freed.
1590 static inline void dev_put(struct net_device *dev)
1592 atomic_dec(&dev->refcnt);
1596 * dev_hold - get reference to device
1597 * @dev: network device
1599 * Hold reference to device to keep it from being freed.
1601 static inline void dev_hold(struct net_device *dev)
1603 atomic_inc(&dev->refcnt);
1606 /* Carrier loss detection, dial on demand. The functions netif_carrier_on
1607 * and _off may be called from IRQ context, but it is caller
1608 * who is responsible for serialization of these calls.
1610 * The name carrier is inappropriate, these functions should really be
1611 * called netif_lowerlayer_*() because they represent the state of any
1612 * kind of lower layer not just hardware media.
1615 extern void linkwatch_fire_event(struct net_device *dev);
1616 extern void linkwatch_forget_dev(struct net_device *dev);
1619 * netif_carrier_ok - test if carrier present
1620 * @dev: network device
1622 * Check if carrier is present on device
1624 static inline int netif_carrier_ok(const struct net_device *dev)
1626 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
1629 extern unsigned long dev_trans_start(struct net_device *dev);
1631 extern void __netdev_watchdog_up(struct net_device *dev);
1633 extern void netif_carrier_on(struct net_device *dev);
1635 extern void netif_carrier_off(struct net_device *dev);
1638 * netif_dormant_on - mark device as dormant.
1639 * @dev: network device
1641 * Mark device as dormant (as per RFC2863).
1643 * The dormant state indicates that the relevant interface is not
1644 * actually in a condition to pass packets (i.e., it is not 'up') but is
1645 * in a "pending" state, waiting for some external event. For "on-
1646 * demand" interfaces, this new state identifies the situation where the
1647 * interface is waiting for events to place it in the up state.
1650 static inline void netif_dormant_on(struct net_device *dev)
1652 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
1653 linkwatch_fire_event(dev);
1657 * netif_dormant_off - set device as not dormant.
1658 * @dev: network device
1660 * Device is not in dormant state.
1662 static inline void netif_dormant_off(struct net_device *dev)
1664 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
1665 linkwatch_fire_event(dev);
1669 * netif_dormant - test if carrier present
1670 * @dev: network device
1672 * Check if carrier is present on device
1674 static inline int netif_dormant(const struct net_device *dev)
1676 return test_bit(__LINK_STATE_DORMANT, &dev->state);
1681 * netif_oper_up - test if device is operational
1682 * @dev: network device
1684 * Check if carrier is operational
1686 static inline int netif_oper_up(const struct net_device *dev)
1688 return (dev->operstate == IF_OPER_UP ||
1689 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
1693 * netif_device_present - is device available or removed
1694 * @dev: network device
1696 * Check if device has not been removed from system.
1698 static inline int netif_device_present(struct net_device *dev)
1700 return test_bit(__LINK_STATE_PRESENT, &dev->state);
1703 extern void netif_device_detach(struct net_device *dev);
1705 extern void netif_device_attach(struct net_device *dev);
1708 * Network interface message level settings
1710 #define HAVE_NETIF_MSG 1
1713 NETIF_MSG_DRV = 0x0001,
1714 NETIF_MSG_PROBE = 0x0002,
1715 NETIF_MSG_LINK = 0x0004,
1716 NETIF_MSG_TIMER = 0x0008,
1717 NETIF_MSG_IFDOWN = 0x0010,
1718 NETIF_MSG_IFUP = 0x0020,
1719 NETIF_MSG_RX_ERR = 0x0040,
1720 NETIF_MSG_TX_ERR = 0x0080,
1721 NETIF_MSG_TX_QUEUED = 0x0100,
1722 NETIF_MSG_INTR = 0x0200,
1723 NETIF_MSG_TX_DONE = 0x0400,
1724 NETIF_MSG_RX_STATUS = 0x0800,
1725 NETIF_MSG_PKTDATA = 0x1000,
1726 NETIF_MSG_HW = 0x2000,
1727 NETIF_MSG_WOL = 0x4000,
1730 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
1731 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
1732 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
1733 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
1734 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
1735 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
1736 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
1737 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
1738 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
1739 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
1740 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
1741 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
1742 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
1743 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
1744 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
1746 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
1749 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
1750 return default_msg_enable_bits;
1751 if (debug_value == 0) /* no output */
1753 /* set low N bits */
1754 return (1 << debug_value) - 1;
1757 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
1759 spin_lock(&txq->_xmit_lock);
1760 txq->xmit_lock_owner = cpu;
1763 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
1765 spin_lock_bh(&txq->_xmit_lock);
1766 txq->xmit_lock_owner = smp_processor_id();
1769 static inline int __netif_tx_trylock(struct netdev_queue *txq)
1771 int ok = spin_trylock(&txq->_xmit_lock);
1773 txq->xmit_lock_owner = smp_processor_id();
1777 static inline void __netif_tx_unlock(struct netdev_queue *txq)
1779 txq->xmit_lock_owner = -1;
1780 spin_unlock(&txq->_xmit_lock);
1783 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
1785 txq->xmit_lock_owner = -1;
1786 spin_unlock_bh(&txq->_xmit_lock);
1789 static inline void txq_trans_update(struct netdev_queue *txq)
1791 if (txq->xmit_lock_owner != -1)
1792 txq->trans_start = jiffies;
1796 * netif_tx_lock - grab network device transmit lock
1797 * @dev: network device
1799 * Get network device transmit lock
1801 static inline void netif_tx_lock(struct net_device *dev)
1806 spin_lock(&dev->tx_global_lock);
1807 cpu = smp_processor_id();
1808 for (i = 0; i < dev->num_tx_queues; i++) {
1809 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1811 /* We are the only thread of execution doing a
1812 * freeze, but we have to grab the _xmit_lock in
1813 * order to synchronize with threads which are in
1814 * the ->hard_start_xmit() handler and already
1815 * checked the frozen bit.
1817 __netif_tx_lock(txq, cpu);
1818 set_bit(__QUEUE_STATE_FROZEN, &txq->state);
1819 __netif_tx_unlock(txq);
1823 static inline void netif_tx_lock_bh(struct net_device *dev)
1829 static inline void netif_tx_unlock(struct net_device *dev)
1833 for (i = 0; i < dev->num_tx_queues; i++) {
1834 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1836 /* No need to grab the _xmit_lock here. If the
1837 * queue is not stopped for another reason, we
1840 clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
1841 netif_schedule_queue(txq);
1843 spin_unlock(&dev->tx_global_lock);
1846 static inline void netif_tx_unlock_bh(struct net_device *dev)
1848 netif_tx_unlock(dev);
1852 #define HARD_TX_LOCK(dev, txq, cpu) { \
1853 if ((dev->features & NETIF_F_LLTX) == 0) { \
1854 __netif_tx_lock(txq, cpu); \
1858 #define HARD_TX_UNLOCK(dev, txq) { \
1859 if ((dev->features & NETIF_F_LLTX) == 0) { \
1860 __netif_tx_unlock(txq); \
1864 static inline void netif_tx_disable(struct net_device *dev)
1870 cpu = smp_processor_id();
1871 for (i = 0; i < dev->num_tx_queues; i++) {
1872 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1874 __netif_tx_lock(txq, cpu);
1875 netif_tx_stop_queue(txq);
1876 __netif_tx_unlock(txq);
1881 static inline void netif_addr_lock(struct net_device *dev)
1883 spin_lock(&dev->addr_list_lock);
1886 static inline void netif_addr_lock_bh(struct net_device *dev)
1888 spin_lock_bh(&dev->addr_list_lock);
1891 static inline void netif_addr_unlock(struct net_device *dev)
1893 spin_unlock(&dev->addr_list_lock);
1896 static inline void netif_addr_unlock_bh(struct net_device *dev)
1898 spin_unlock_bh(&dev->addr_list_lock);
1902 * dev_addrs walker. Should be used only for read access. Call with
1903 * rcu_read_lock held.
1905 #define for_each_dev_addr(dev, ha) \
1906 list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
1908 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
1910 extern void ether_setup(struct net_device *dev);
1912 /* Support for loadable net-drivers */
1913 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
1914 void (*setup)(struct net_device *),
1915 unsigned int queue_count);
1916 #define alloc_netdev(sizeof_priv, name, setup) \
1917 alloc_netdev_mq(sizeof_priv, name, setup, 1)
1918 extern int register_netdev(struct net_device *dev);
1919 extern void unregister_netdev(struct net_device *dev);
1921 /* Functions used for device addresses handling */
1922 extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
1923 unsigned char addr_type);
1924 extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
1925 unsigned char addr_type);
1926 extern int dev_addr_add_multiple(struct net_device *to_dev,
1927 struct net_device *from_dev,
1928 unsigned char addr_type);
1929 extern int dev_addr_del_multiple(struct net_device *to_dev,
1930 struct net_device *from_dev,
1931 unsigned char addr_type);
1933 /* Functions used for secondary unicast and multicast support */
1934 extern void dev_set_rx_mode(struct net_device *dev);
1935 extern void __dev_set_rx_mode(struct net_device *dev);
1936 extern int dev_unicast_delete(struct net_device *dev, void *addr);
1937 extern int dev_unicast_add(struct net_device *dev, void *addr);
1938 extern int dev_unicast_sync(struct net_device *to, struct net_device *from);
1939 extern void dev_unicast_unsync(struct net_device *to, struct net_device *from);
1940 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
1941 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1942 extern int dev_mc_sync(struct net_device *to, struct net_device *from);
1943 extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
1944 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
1945 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1946 extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1947 extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1948 extern int dev_set_promiscuity(struct net_device *dev, int inc);
1949 extern int dev_set_allmulti(struct net_device *dev, int inc);
1950 extern void netdev_state_change(struct net_device *dev);
1951 extern void netdev_bonding_change(struct net_device *dev,
1952 unsigned long event);
1953 extern void netdev_features_change(struct net_device *dev);
1954 /* Load a device via the kmod */
1955 extern void dev_load(struct net *net, const char *name);
1956 extern void dev_mcast_init(void);
1957 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
1958 extern void dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
1960 extern int netdev_max_backlog;
1961 extern int weight_p;
1962 extern int netdev_set_master(struct net_device *dev, struct net_device *master);
1963 extern int skb_checksum_help(struct sk_buff *skb);
1964 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1966 extern void netdev_rx_csum_fault(struct net_device *dev);
1968 static inline void netdev_rx_csum_fault(struct net_device *dev)
1972 /* rx skb timestamps */
1973 extern void net_enable_timestamp(void);
1974 extern void net_disable_timestamp(void);
1976 #ifdef CONFIG_PROC_FS
1977 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
1978 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
1979 extern void dev_seq_stop(struct seq_file *seq, void *v);
1982 extern int netdev_class_create_file(struct class_attribute *class_attr);
1983 extern void netdev_class_remove_file(struct class_attribute *class_attr);
1985 extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1987 extern void linkwatch_run_queue(void);
1989 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
1990 unsigned long mask);
1991 unsigned long netdev_fix_features(unsigned long features, const char *name);
1993 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
1994 struct net_device *dev);
1996 static inline int net_gso_ok(int features, int gso_type)
1998 int feature = gso_type << NETIF_F_GSO_SHIFT;
1999 return (features & feature) == feature;
2002 static inline int skb_gso_ok(struct sk_buff *skb, int features)
2004 return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2005 (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
2008 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
2010 return skb_is_gso(skb) &&
2011 (!skb_gso_ok(skb, dev->features) ||
2012 unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2015 static inline void netif_set_gso_max_size(struct net_device *dev,
2018 dev->gso_max_size = size;
2021 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2022 struct net_device *master)
2024 if (skb->pkt_type == PACKET_HOST) {
2025 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2027 memcpy(dest, master->dev_addr, ETH_ALEN);
2031 /* On bonding slaves other than the currently active slave, suppress
2032 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2033 * ARP on active-backup slaves with arp_validate enabled.
2035 static inline int skb_bond_should_drop(struct sk_buff *skb)
2037 struct net_device *dev = skb->dev;
2038 struct net_device *master = dev->master;
2041 if (master->priv_flags & IFF_MASTER_ARPMON)
2042 dev->last_rx = jiffies;
2044 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2045 /* Do address unmangle. The local destination address
2046 * will be always the one master has. Provides the right
2047 * functionality in a bridge.
2049 skb_bond_set_mac_by_master(skb, master);
2052 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2053 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2054 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2057 if (master->priv_flags & IFF_MASTER_ALB) {
2058 if (skb->pkt_type != PACKET_BROADCAST &&
2059 skb->pkt_type != PACKET_MULTICAST)
2062 if (master->priv_flags & IFF_MASTER_8023AD &&
2063 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2072 extern struct pernet_operations __net_initdata loopback_net_ops;
2074 static inline int dev_ethtool_get_settings(struct net_device *dev,
2075 struct ethtool_cmd *cmd)
2077 if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
2079 return dev->ethtool_ops->get_settings(dev, cmd);
2082 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
2084 if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
2086 return dev->ethtool_ops->get_rx_csum(dev);
2089 static inline u32 dev_ethtool_get_flags(struct net_device *dev)
2091 if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
2093 return dev->ethtool_ops->get_flags(dev);
2095 #endif /* __KERNEL__ */
2097 #endif /* _LINUX_NETDEVICE_H */