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/**

 *	struct net_device - The DEVICE structure. *		Actually, this whole structure is a big mistake.  It mixes I/O *		data with strictly "high-level" data, and it has to know about *		almost every data structure used in the INET module. * *	@name:	This is the first field of the "visible" part of this structure *		(i.e. as seen by users in the "Space.c" file).  It is the name *	 	of the interface. * *	@name_hlist: 	Device name hash chain, please keep it close to name[] *	@ifalias:	SNMP alias *	@mem_end:	Shared memory end *	@mem_start:	Shared memory start *	@base_addr:	Device I/O address *	@irq:		Device IRQ number * *	@carrier_changes:	Stats to monitor carrier on<->off transitions * *	@state:		Generic network queuing layer state, see netdev_state_t *	@dev_list:	The global list of network devices *	@napi_list:	List entry used for polling NAPI devices *	@unreg_list:	List entry  when we are unregistering the *			device; see the function unregister_netdev *	@close_list:	List entry used when we are closing the device *	@ptype_all:     Device-specific packet handlers for all protocols *	@ptype_specific: Device-specific, protocol-specific packet handlers * *	@adj_list:	Directly linked devices, like slaves for bonding *	@all_adj_list:	All linked devices, *including* neighbours *	@features:	Currently active device features *	@hw_features:	User-changeable features * *	@wanted_features:	User-requested features *	@vlan_features:		Mask of features inheritable by VLAN devices * *	@hw_enc_features:	Mask of features inherited by encapsulating devices *				This field indicates what encapsulation *				offloads the hardware is capable of doing, *				and drivers will need to set them appropriately. * *	@mpls_features:	Mask of features inheritable by MPLS * *	@ifindex:	interface index *	@group:		The group the device belongs to * *	@stats:		Statistics struct, which was left as a legacy, use *			rtnl_link_stats64 instead * *	@rx_dropped:	Dropped packets by core network, *			do not use this in drivers *	@tx_dropped:	Dropped packets by core network, *			do not use this in drivers *	@rx_nohandler:	nohandler dropped packets by core network on *			inactive devices, do not use this in drivers * *	@wireless_handlers:	List of functions to handle Wireless Extensions, *				instead of ioctl, *				see 
   
     for details. *	@wireless_data:	Instance data managed by the core of wireless extensions * *	@netdev_ops:	Includes several pointers to callbacks, *			if one wants to override the ndo_*() functions *	@ethtool_ops:	Management operations *	@ndisc_ops:	Includes callbacks for different IPv6 neighbour *			discovery handling. Necessary for e.g. 6LoWPAN. *	@header_ops:	Includes callbacks for creating,parsing,caching,etc *			of Layer 2 headers. * *	@flags:		Interface flags (a la BSD) *	@priv_flags:	Like 'flags' but invisible to userspace, *			see if.h for the definitions *	@gflags:	Global flags ( kept as legacy ) *	@padded:	How much padding added by alloc_netdev() *	@operstate:	RFC2863 operstate *	@link_mode:	Mapping policy to operstate *	@if_port:	Selectable AUI, TP, ... *	@dma:		DMA channel *	@mtu:		Interface MTU value *	@type:		Interface hardware type *	@hard_header_len: Maximum hardware header length. * *	@needed_headroom: Extra headroom the hardware may need, but not in all *			  cases can this be guaranteed *	@needed_tailroom: Extra tailroom the hardware may need, but not in all *			  cases can this be guaranteed. Some cases also use *			  LL_MAX_HEADER instead to allocate the skb * *	interface address info: * * 	@perm_addr:		Permanent hw address * 	@addr_assign_type:	Hw address assignment type * 	@addr_len:		Hardware address length *	@neigh_priv_len:	Used in neigh_alloc() * 	@dev_id:		Used to differentiate devices that share * 				the same link layer address * 	@dev_port:		Used to differentiate devices that share * 				the same function *	@addr_list_lock:	XXX: need comments on this one *	@uc_promisc:		Counter that indicates promiscuous mode *				has been enabled due to the need to listen to *				additional unicast addresses in a device that *				does not implement ndo_set_rx_mode() *	@uc:			unicast mac addresses *	@mc:			multicast mac addresses *	@dev_addrs:		list of device hw addresses *	@queues_kset:		Group of all Kobjects in the Tx and RX queues *	@promiscuity:		Number of times the NIC is told to work in *				promiscuous mode; if it becomes 0 the NIC will *				exit promiscuous mode *	@allmulti:		Counter, enables or disables allmulticast mode * *	@vlan_info:	VLAN info *	@dsa_ptr:	dsa specific data *	@tipc_ptr:	TIPC specific data *	@atalk_ptr:	AppleTalk link *	@ip_ptr:	IPv4 specific data *	@dn_ptr:	DECnet specific data *	@ip6_ptr:	IPv6 specific data *	@ax25_ptr:	AX.25 specific data *	@ieee80211_ptr:	IEEE 802.11 specific data, assign before registering * *	@last_rx:	Time of last Rx *	@dev_addr:	Hw address (before bcast, *			because most packets are unicast) * *	@_rx:			Array of RX queues *	@num_rx_queues:		Number of RX queues *				allocated at register_netdev() time *	@real_num_rx_queues: 	Number of RX queues currently active in device * *	@rx_handler:		handler for received packets *	@rx_handler_data: 	XXX: need comments on this one *	@ingress_queue:		XXX: need comments on this one *	@broadcast:		hw bcast address * *	@rx_cpu_rmap:	CPU reverse-mapping for RX completion interrupts, *			indexed by RX queue number. Assigned by driver. *			This must only be set if the ndo_rx_flow_steer *			operation is defined *	@index_hlist:		Device index hash chain * *	@_tx:			Array of TX queues *	@num_tx_queues:		Number of TX queues allocated at alloc_netdev_mq() time *	@real_num_tx_queues: 	Number of TX queues currently active in device *	@qdisc:			Root qdisc from userspace point of view *	@tx_queue_len:		Max frames per queue allowed *	@tx_global_lock: 	XXX: need comments on this one * *	@xps_maps:	XXX: need comments on this one * *	@watchdog_timeo:	Represents the timeout that is used by *				the watchdog (see dev_watchdog()) *	@watchdog_timer:	List of timers * *	@pcpu_refcnt:		Number of references to this device *	@todo_list:		Delayed register/unregister *	@link_watch_list:	XXX: need comments on this one * *	@reg_state:		Register/unregister state machine *	@dismantle:		Device is going to be freed *	@rtnl_link_state:	This enum represents the phases of creating *				a new link * *	@destructor:		Called from unregister, *				can be used to call free_netdev *	@npinfo:		XXX: need comments on this one * 	@nd_net:		Network namespace this network device is inside * * 	@ml_priv:	Mid-layer private * 	@lstats:	Loopback statistics * 	@tstats:	Tunnel statistics * 	@dstats:	Dummy statistics * 	@vstats:	Virtual ethernet statistics * *	@garp_port:	GARP *	@mrp_port:	MRP * *	@dev:		Class/net/name entry *	@sysfs_groups:	Space for optional device, statistics and wireless *			sysfs groups * *	@sysfs_rx_queue_group:	Space for optional per-rx queue attributes *	@rtnl_link_ops:	Rtnl_link_ops * *	@gso_max_size:	Maximum size of generic segmentation offload *	@gso_max_segs:	Maximum number of segments that can be passed to the *			NIC for GSO * *	@dcbnl_ops:	Data Center Bridging netlink ops *	@num_tc:	Number of traffic classes in the net device *	@tc_to_txq:	XXX: need comments on this one *	@prio_tc_map:	XXX: need comments on this one * *	@fcoe_ddp_xid:	Max exchange id for FCoE LRO by ddp * *	@priomap:	XXX: need comments on this one *	@phydev:	Physical device may attach itself *			for hardware timestamping * *	@qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock *	@qdisc_running_key: lockdep class annotating Qdisc->running seqcount * *	@proto_down:	protocol port state information can be sent to the *			switch driver and used to set the phys state of the *			switch port. * *	FIXME: cleanup struct net_device such that network protocol info *	moves out. */struct net_device {	char			name[IFNAMSIZ];	struct hlist_node	name_hlist;	char 			*ifalias;	/*	 *	I/O specific fields	 *	FIXME: Merge these and struct ifmap into one	 */	unsigned long		mem_end;	unsigned long		mem_start;	unsigned long		base_addr;	int			irq;	atomic_t		carrier_changes;	/*	 *	Some hardware also needs these fields (state,dev_list,	 *	napi_list,unreg_list,close_list) but they are not	 *	part of the usual set specified in Space.c.	 */	unsigned long		state;	struct list_head	dev_list;	struct list_head	napi_list;	struct list_head	unreg_list;	struct list_head	close_list;	struct list_head	ptype_all;	struct list_head	ptype_specific;	struct {		struct list_head upper;		struct list_head lower;	} adj_list;	struct {		struct list_head upper;		struct list_head lower;	} all_adj_list;	netdev_features_t	features;	netdev_features_t	hw_features;	netdev_features_t	wanted_features;	netdev_features_t	vlan_features;	netdev_features_t	hw_enc_features;	netdev_features_t	mpls_features;	netdev_features_t	gso_partial_features;	int			ifindex;	int			group;	struct net_device_stats	stats;	atomic_long_t		rx_dropped;	atomic_long_t		tx_dropped;	atomic_long_t		rx_nohandler;#ifdef CONFIG_WIRELESS_EXT	const struct iw_handler_def *wireless_handlers;	struct iw_public_data	*wireless_data;#endif	const struct net_device_ops *netdev_ops;	const struct ethtool_ops *ethtool_ops;#ifdef CONFIG_NET_SWITCHDEV	const struct switchdev_ops *switchdev_ops;#endif#ifdef CONFIG_NET_L3_MASTER_DEV	const struct l3mdev_ops	*l3mdev_ops;#endif#if IS_ENABLED(CONFIG_IPV6)	const struct ndisc_ops *ndisc_ops;#endif	const struct header_ops *header_ops;	unsigned int		flags;	unsigned int		priv_flags;	unsigned short		gflags;	unsigned short		padded;	unsigned char		operstate;	unsigned char		link_mode;	unsigned char		if_port;	unsigned char		dma;	unsigned int		mtu;	unsigned short		type;	unsigned short		hard_header_len;	unsigned short		needed_headroom;	unsigned short		needed_tailroom;	/* Interface address info. */	unsigned char		perm_addr[MAX_ADDR_LEN];	unsigned char		addr_assign_type;	unsigned char		addr_len;	unsigned short		neigh_priv_len;	unsigned short          dev_id;	unsigned short          dev_port;	spinlock_t		addr_list_lock;	unsigned char		name_assign_type;	bool			uc_promisc;	struct netdev_hw_addr_list	uc;	struct netdev_hw_addr_list	mc;	struct netdev_hw_addr_list	dev_addrs;#ifdef CONFIG_SYSFS	struct kset		*queues_kset;#endif	unsigned int		promiscuity;	unsigned int		allmulti;	/* Protocol-specific pointers */#if IS_ENABLED(CONFIG_VLAN_8021Q)	struct vlan_info __rcu	*vlan_info;#endif#if IS_ENABLED(CONFIG_NET_DSA)	struct dsa_switch_tree	*dsa_ptr;#endif#if IS_ENABLED(CONFIG_TIPC)	struct tipc_bearer __rcu *tipc_ptr;#endif	void 			*atalk_ptr;	struct in_device __rcu	*ip_ptr;	struct dn_dev __rcu     *dn_ptr;	struct inet6_dev __rcu	*ip6_ptr;	void			*ax25_ptr;	struct wireless_dev	*ieee80211_ptr;	struct wpan_dev		*ieee802154_ptr;#if IS_ENABLED(CONFIG_MPLS_ROUTING)	struct mpls_dev __rcu	*mpls_ptr;#endif/* * Cache lines mostly used on receive path (including eth_type_trans()) */	unsigned long		last_rx;	/* Interface address info used in eth_type_trans() */	unsigned char		*dev_addr;#ifdef CONFIG_SYSFS	struct netdev_rx_queue	*_rx;	unsigned int		num_rx_queues;	unsigned int		real_num_rx_queues;#endif	unsigned long		gro_flush_timeout;	rx_handler_func_t __rcu	*rx_handler;	void __rcu		*rx_handler_data;#ifdef CONFIG_NET_CLS_ACT	struct tcf_proto __rcu  *ingress_cl_list;#endif	struct netdev_queue __rcu *ingress_queue;#ifdef CONFIG_NETFILTER_INGRESS	struct nf_hook_entry __rcu *nf_hooks_ingress;#endif	unsigned char		broadcast[MAX_ADDR_LEN];#ifdef CONFIG_RFS_ACCEL	struct cpu_rmap		*rx_cpu_rmap;#endif	struct hlist_node	index_hlist;/* * Cache lines mostly used on transmit path */	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;	unsigned int		num_tx_queues;	unsigned int		real_num_tx_queues;	struct Qdisc		*qdisc;#ifdef CONFIG_NET_SCHED	DECLARE_HASHTABLE	(qdisc_hash, 4);#endif	unsigned long		tx_queue_len;	spinlock_t		tx_global_lock;	int			watchdog_timeo;#ifdef CONFIG_XPS	struct xps_dev_maps __rcu *xps_maps;#endif#ifdef CONFIG_NET_CLS_ACT	struct tcf_proto __rcu  *egress_cl_list;#endif	/* These may be needed for future network-power-down code. */	struct timer_list	watchdog_timer;	int __percpu		*pcpu_refcnt;	struct list_head	todo_list;	struct list_head	link_watch_list;	enum { NETREG_UNINITIALIZED=0,	       NETREG_REGISTERED,	/* completed register_netdevice */	       NETREG_UNREGISTERING,	/* called unregister_netdevice */	       NETREG_UNREGISTERED,	/* completed unregister todo */	       NETREG_RELEASED,		/* called free_netdev */	       NETREG_DUMMY,		/* dummy device for NAPI poll */	} reg_state:8;	bool dismantle;	enum {		RTNL_LINK_INITIALIZED,		RTNL_LINK_INITIALIZING,	} rtnl_link_state:16;	void (*destructor)(struct net_device *dev);#ifdef CONFIG_NETPOLL	struct netpoll_info __rcu	*npinfo;#endif	possible_net_t			nd_net;	/* mid-layer private */	union {		void					*ml_priv;		struct pcpu_lstats __percpu		*lstats;		struct pcpu_sw_netstats __percpu	*tstats;		struct pcpu_dstats __percpu		*dstats;		struct pcpu_vstats __percpu		*vstats;	};	struct garp_port __rcu	*garp_port;	struct mrp_port __rcu	*mrp_port;	struct device		dev;	const struct attribute_group *sysfs_groups[4];	const struct attribute_group *sysfs_rx_queue_group;	const struct rtnl_link_ops *rtnl_link_ops;	/* for setting kernel sock attribute on TCP connection setup */#define GSO_MAX_SIZE		65536	unsigned int		gso_max_size;#define GSO_MAX_SEGS		65535	u16			gso_max_segs;#ifdef CONFIG_DCB	const struct dcbnl_rtnl_ops *dcbnl_ops;#endif	u8			num_tc;	struct netdev_tc_txq	tc_to_txq[TC_MAX_QUEUE];	u8			prio_tc_map[TC_BITMASK + 1];#if IS_ENABLED(CONFIG_FCOE)	unsigned int		fcoe_ddp_xid;#endif#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)	struct netprio_map __rcu *priomap;#endif	struct phy_device	*phydev;	struct lock_class_key	*qdisc_tx_busylock;	struct lock_class_key	*qdisc_running_key;	bool			proto_down;};
   

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