/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the Interfaces handler. * * Version: @(#)dev.h 1.0.10 08/12/93 * * Authors: Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Corey Minyard <wf-rch!minyard@relay.EU.net> * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov> * Alan Cox, <Alan.Cox@linux.org> * Bjorn Ekwall. <bj0rn@blox.se> * Pekka Riikonen <priikone@poseidon.pspt.fi> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Moved to /usr/include/linux for NET3 */ #ifndef _LINUX_NETDEVICE_H #define _LINUX_NETDEVICE_H #include <linux/if.h> #include <linux/if_ether.h> #include <linux/if_packet.h> #ifdef __KERNEL__ #include <linux/timer.h> #include <linux/delay.h> #include <asm/atomic.h> #include <asm/cache.h> #include <asm/byteorder.h> #include <linux/device.h> #include <linux/percpu.h> #include <linux/dmaengine.h> #include <linux/workqueue.h> #include <net/net_namespace.h> struct vlan_group; struct ethtool_ops; struct netpoll_info; /* 802.11 specific */ struct wireless_dev; /* source back-compat hooks */ #define SET_ETHTOOL_OPS(netdev,ops) \ ( (netdev)->ethtool_ops = (ops) ) #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev functions are available. */ #define HAVE_FREE_NETDEV /* free_netdev() */ #define HAVE_NETDEV_PRIV /* netdev_priv() */ #define NET_XMIT_SUCCESS 0 #define NET_XMIT_DROP 1 /* skb dropped */ #define NET_XMIT_CN 2 /* congestion notification */ #define NET_XMIT_POLICED 3 /* skb is shot by police */ #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue; (TC use only - dev_queue_xmit returns this as NET_XMIT_SUCCESS) */ /* Backlog congestion levels */ #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ #define NET_RX_DROP 1 /* packet dropped */ #define NET_RX_CN_LOW 2 /* storm alert, just in case */ #define NET_RX_CN_MOD 3 /* Storm on its way! */ #define NET_RX_CN_HIGH 4 /* The storm is here */ #define NET_RX_BAD 5 /* packet dropped due to kernel error */ /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It * indicates that the device will soon be dropping packets, or already drops * some packets of the same priority; prompting us to send less aggressively. */ #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) #endif #define MAX_ADDR_LEN 32 /* Largest hardware address length */ /* Driver transmit return codes */ #define NETDEV_TX_OK 0 /* driver took care of packet */ #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ /* * Compute the worst case header length according to the protocols * used. */ #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR) #define LL_MAX_HEADER 32 #else #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) #define LL_MAX_HEADER 96 #else #define LL_MAX_HEADER 48 #endif #endif #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) #define MAX_HEADER LL_MAX_HEADER #else #define MAX_HEADER (LL_MAX_HEADER + 48) #endif struct net_device_subqueue { /* Give a control state for each queue. This struct may contain * per-queue locks in the future. */ unsigned long state; }; /* * Network device statistics. Akin to the 2.0 ether stats but * with byte counters. */ struct net_device_stats { unsigned long rx_packets; /* total packets received */ unsigned long tx_packets; /* total packets transmitted */ unsigned long rx_bytes; /* total bytes received */ unsigned long tx_bytes; /* total bytes transmitted */ unsigned long rx_errors; /* bad packets received */ unsigned long tx_errors; /* packet transmit problems */ unsigned long rx_dropped; /* no space in linux buffers */ unsigned long tx_dropped; /* no space available in linux */ unsigned long multicast; /* multicast packets received */ unsigned long collisions; /* detailed rx_errors: */ unsigned long rx_length_errors; unsigned long rx_over_errors; /* receiver ring buff overflow */ unsigned long rx_crc_errors; /* recved pkt with crc error */ unsigned long rx_frame_errors; /* recv'd frame alignment error */ unsigned long rx_fifo_errors; /* recv'r fifo overrun */ unsigned long rx_missed_errors; /* receiver missed packet */ /* detailed tx_errors */ unsigned long tx_aborted_errors; unsigned long tx_carrier_errors; unsigned long tx_fifo_errors; unsigned long tx_heartbeat_errors; unsigned long tx_window_errors; /* for cslip etc */ unsigned long rx_compressed; unsigned long tx_compressed; }; /* Media selection options. */ enum { IF_PORT_UNKNOWN = 0, IF_PORT_10BASE2, IF_PORT_10BASET, IF_PORT_AUI, IF_PORT_100BASET, IF_PORT_100BASETX, IF_PORT_100BASEFX }; #ifdef __KERNEL__ #include <linux/cache.h> #include <linux/skbuff.h> struct neighbour; struct neigh_parms; struct sk_buff; struct netif_rx_stats { unsigned total; unsigned dropped; unsigned time_squeeze; unsigned cpu_collision; }; DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); struct dev_addr_list { struct dev_addr_list *next; u8 da_addr[MAX_ADDR_LEN]; u8 da_addrlen; u8 da_synced; int da_users; int da_gusers; }; /* * We tag multicasts with these structures. */ #define dev_mc_list dev_addr_list #define dmi_addr da_addr #define dmi_addrlen da_addrlen #define dmi_users da_users #define dmi_gusers da_gusers struct hh_cache { struct hh_cache *hh_next; /* Next entry */ atomic_t hh_refcnt; /* number of users */ /* * We want hh_output, hh_len, hh_lock and hh_data be a in a separate * cache line on SMP. * They are mostly read, but hh_refcnt may be changed quite frequently, * incurring cache line ping pongs. */ __be16 hh_type ____cacheline_aligned_in_smp; /* protocol identifier, f.e ETH_P_IP * NOTE: For VLANs, this will be the * encapuslated type. --BLG */ u16 hh_len; /* length of header */ int (*hh_output)(struct sk_buff *skb); seqlock_t hh_lock; /* cached hardware header; allow for machine alignment needs. */ #define HH_DATA_MOD 16 #define HH_DATA_OFF(__len) \ (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) #define HH_DATA_ALIGN(__len) \ (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; }; /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. * Alternative is: * dev->hard_header_len ? (dev->hard_header_len + * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 * * We could use other alignment values, but we must maintain the * relationship HH alignment <= LL alignment. */ #define LL_RESERVED_SPACE(dev) \ (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) struct header_ops { int (*create) (struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned len); int (*parse)(const struct sk_buff *skb, unsigned char *haddr); int (*rebuild)(struct sk_buff *skb); #define HAVE_HEADER_CACHE int (*cache)(const struct neighbour *neigh, struct hh_cache *hh); void (*cache_update)(struct hh_cache *hh, const struct net_device *dev, const unsigned char *haddr); }; /* These flag bits are private to the generic network queueing * layer, they may not be explicitly referenced by any other * code. */ enum netdev_state_t { __LINK_STATE_XOFF=0, __LINK_STATE_START, __LINK_STATE_PRESENT, __LINK_STATE_SCHED, __LINK_STATE_NOCARRIER, __LINK_STATE_LINKWATCH_PENDING, __LINK_STATE_DORMANT, __LINK_STATE_QDISC_RUNNING, }; /* * This structure holds at boot time configured netdevice settings. They * are then used in the device probing. */ struct netdev_boot_setup { char name[IFNAMSIZ]; struct ifmap map; }; #define NETDEV_BOOT_SETUP_MAX 8 extern int __init netdev_boot_setup(char *str); /* * Structure for NAPI scheduling similar to tasklet but with weighting */ struct napi_struct { /* The poll_list must only be managed by the entity which * changes the state of the NAPI_STATE_SCHED bit. This means * whoever atomically sets that bit can add this napi_struct * to the per-cpu poll_list, and whoever clears that bit * can remove from the list right before clearing the bit. */ struct list_head poll_list; unsigned long state; int weight; int (*poll)(struct napi_struct *, int); #ifdef CONFIG_NETPOLL spinlock_t poll_lock; int poll_owner; struct net_device *dev; struct list_head dev_list; #endif }; enum { NAPI_STATE_SCHED, /* Poll is scheduled */ NAPI_STATE_DISABLE, /* Disable pending */ }; extern void __napi_schedule(struct napi_struct *n); static inline int napi_disable_pending(struct napi_struct *n) { return test_bit(NAPI_STATE_DISABLE, &n->state); } /** * napi_schedule_prep - check if napi can be scheduled * @n: napi context * * Test if NAPI routine is already running, and if not mark * it as running. This is used as a condition variable * insure only one NAPI poll instance runs. We also make * sure there is no pending NAPI disable. */ static inline int napi_schedule_prep(struct napi_struct *n) { return !napi_disable_pending(n) && !test_and_set_bit(NAPI_STATE_SCHED, &n->state); } /** * napi_schedule - schedule NAPI poll * @n: napi context * * Schedule NAPI poll routine to be called if it is not already * running. */ static inline void napi_schedule(struct napi_struct *n) { if (napi_schedule_prep(n)) __napi_schedule(n); } /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ static inline int napi_reschedule(struct napi_struct *napi) { if (napi_schedule_prep(napi)) { __napi_schedule(napi); return 1; } return 0; } /** * napi_complete - NAPI processing complete * @n: napi context * * Mark NAPI processing as complete. */ static inline void __napi_complete(struct napi_struct *n) { BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); list_del(&n->poll_list); smp_mb__before_clear_bit(); clear_bit(NAPI_STATE_SCHED, &n->state); } static inline void napi_complete(struct napi_struct *n) { unsigned long flags; local_irq_save(flags); __napi_complete(n); local_irq_restore(flags); } /** * napi_disable - prevent NAPI from scheduling * @n: napi context * * Stop NAPI from being scheduled on this context. * Waits till any outstanding processing completes. */ static inline void napi_disable(struct napi_struct *n) { set_bit(NAPI_STATE_DISABLE, &n->state); while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) msleep(1); clear_bit(NAPI_STATE_DISABLE, &n->state); } /** * napi_enable - enable NAPI scheduling * @n: napi context * * Resume NAPI from being scheduled on this context. * Must be paired with napi_disable. */ static inline void napi_enable(struct napi_struct *n) { BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); smp_mb__before_clear_bit(); clear_bit(NAPI_STATE_SCHED, &n->state); } #ifdef CONFIG_SMP /** * napi_synchronize - wait until NAPI is not running * @n: napi context * * Wait until NAPI is done being scheduled on this context. * Waits till any outstanding processing completes but * does not disable future activations. */ static inline void napi_synchronize(const struct napi_struct *n) { while (test_bit(NAPI_STATE_SCHED, &n->state)) msleep(1); } #else # define napi_synchronize(n) barrier() #endif /* * 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. * * FIXME: cleanup struct net_device such that network protocol info * moves out. */ struct net_device { /* * 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 * the interface. */ char name[IFNAMSIZ]; /* device name hash chain */ struct hlist_node name_hlist; /* * I/O specific fields * FIXME: Merge these and struct ifmap into one */ unsigned long mem_end; /* shared mem end */ unsigned long mem_start; /* shared mem start */ unsigned long base_addr; /* device I/O address */ unsigned int irq; /* device IRQ number */ /* * Some hardware also needs these fields, but they are not * part of the usual set specified in Space.c. */ unsigned char if_port; /* Selectable AUI, TP,..*/ unsigned char dma; /* DMA channel */ unsigned long state; struct list_head dev_list; #ifdef CONFIG_NETPOLL struct list_head napi_list; #endif /* The device initialization function. Called only once. */ int (*init)(struct net_device *dev); /* ------- Fields preinitialized in Space.c finish here ------- */ /* Net device features */ unsigned long features; #define NETIF_F_SG 1 /* Scatter/gather IO. */ #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ #define NETIF_F_GSO 2048 /* Enable software GSO. */ #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated. Please */ /* do not use LLTX in new drivers */ #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */ #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */ #define NETIF_F_LRO 32768 /* large receive offload */ /* Segmentation offload features */ #define NETIF_F_GSO_SHIFT 16 #define NETIF_F_GSO_MASK 0xffff0000 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) /* List of features with software fallbacks. */ #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) struct net_device *next_sched; /* Interface index. Unique device identifier */ int ifindex; int iflink; struct net_device_stats* (*get_stats)(struct net_device *dev); struct net_device_stats stats; #ifdef CONFIG_WIRELESS_EXT /* List of functions to handle Wireless Extensions (instead of ioctl). * See <net/iw_handler.h> for details. Jean II */ const struct iw_handler_def * wireless_handlers; /* Instance data managed by the core of Wireless Extensions. */ struct iw_public_data * wireless_data; #endif const struct ethtool_ops *ethtool_ops; /* Hardware header description */ const struct header_ops *header_ops; /* * This marks the end of the "visible" part of the structure. All * fields hereafter are internal to the system, and may change at * will (read: may be cleaned up at will). */ unsigned int flags; /* interface flags (a la BSD) */ unsigned short gflags; unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ unsigned short padded; /* How much padding added by alloc_netdev() */ unsigned char operstate; /* RFC2863 operstate */ unsigned char link_mode; /* mapping policy to operstate */ unsigned mtu; /* interface MTU value */ unsigned short type; /* interface hardware type */ unsigned short hard_header_len; /* hardware hdr length */ struct net_device *master; /* Pointer to master device of a group, * which this device is member of. */ /* Interface address info. */ unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ unsigned char addr_len; /* hardware address length */ unsigned short dev_id; /* for shared network cards */ struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ int uc_count; /* Number of installed ucasts */ int uc_promisc; struct dev_addr_list *mc_list; /* Multicast mac addresses */ int mc_count; /* Number of installed mcasts */ int promiscuity; int allmulti; /* Protocol specific pointers */ void *atalk_ptr; /* AppleTalk link */ void *ip_ptr; /* IPv4 specific data */ void *dn_ptr; /* DECnet specific data */ void *ip6_ptr; /* IPv6 specific data */ void *ec_ptr; /* Econet specific data */ void *ax25_ptr; /* AX.25 specific data */ struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, assign before registering */ /* * Cache line mostly used on receive path (including eth_type_trans()) */ unsigned long last_rx; /* Time of last Rx */ /* Interface address info used in eth_type_trans() */ unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast because most packets are unicast) */ unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ /* ingress path synchronizer */ spinlock_t ingress_lock; struct Qdisc *qdisc_ingress; /* * Cache line mostly used on queue transmit path (qdisc) */ /* device queue lock */ spinlock_t queue_lock ____cacheline_aligned_in_smp; struct Qdisc *qdisc; struct Qdisc *qdisc_sleeping; struct list_head qdisc_list; unsigned long tx_queue_len; /* Max frames per queue allowed */ /* Partially transmitted GSO packet. */ struct sk_buff *gso_skb; /* * One part is mostly used on xmit path (device) */ /* hard_start_xmit synchronizer */ spinlock_t _xmit_lock ____cacheline_aligned_in_smp; /* cpu id of processor entered to hard_start_xmit or -1, if nobody entered there. */ int xmit_lock_owner; void *priv; /* pointer to private data */ int (*hard_start_xmit) (struct sk_buff *skb, struct net_device *dev); /* These may be needed for future network-power-down code. */ unsigned long trans_start; /* Time (in jiffies) of last Tx */ int watchdog_timeo; /* used by dev_watchdog() */ struct timer_list watchdog_timer; /* * refcnt is a very hot point, so align it on SMP */ /* Number of references to this device */ atomic_t refcnt ____cacheline_aligned_in_smp; /* delayed register/unregister */ struct list_head todo_list; /* device index hash chain */ struct hlist_node index_hlist; struct net_device *link_watch_next; /* register/unregister state machine */ enum { NETREG_UNINITIALIZED=0, NETREG_REGISTERED, /* completed register_netdevice */ NETREG_UNREGISTERING, /* called unregister_netdevice */ NETREG_UNREGISTERED, /* completed unregister todo */ NETREG_RELEASED, /* called free_netdev */ } reg_state; /* Called after device is detached from network. */ void (*uninit)(struct net_device *dev); /* Called after last user reference disappears. */ void (*destructor)(struct net_device *dev); /* Pointers to interface service routines. */ int (*open)(struct net_device *dev); int (*stop)(struct net_device *dev); #define HAVE_NETDEV_POLL #define HAVE_CHANGE_RX_FLAGS void (*change_rx_flags)(struct net_device *dev, int flags); #define HAVE_SET_RX_MODE void (*set_rx_mode)(struct net_device *dev); #define HAVE_MULTICAST void (*set_multicast_list)(struct net_device *dev); #define HAVE_SET_MAC_ADDR int (*set_mac_address)(struct net_device *dev, void *addr); #define HAVE_VALIDATE_ADDR int (*validate_addr)(struct net_device *dev); #define HAVE_PRIVATE_IOCTL int (*do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd); #define HAVE_SET_CONFIG int (*set_config)(struct net_device *dev, struct ifmap *map); #define HAVE_CHANGE_MTU int (*change_mtu)(struct net_device *dev, int new_mtu); #define HAVE_TX_TIMEOUT void (*tx_timeout) (struct net_device *dev); void (*vlan_rx_register)(struct net_device *dev, struct vlan_group *grp); void (*vlan_rx_add_vid)(struct net_device *dev, unsigned short vid); void (*vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid); int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); #ifdef CONFIG_NETPOLL struct netpoll_info *npinfo; #endif #ifdef CONFIG_NET_POLL_CONTROLLER void (*poll_controller)(struct net_device *dev); #endif #ifdef CONFIG_NET_NS /* Network namespace this network device is inside */ struct net *nd_net; #endif /* bridge stuff */ struct net_bridge_port *br_port; /* macvlan */ struct macvlan_port *macvlan_port; /* class/net/name entry */ struct device dev; /* space for optional statistics and wireless sysfs groups */ struct attribute_group *sysfs_groups[3]; /* rtnetlink link ops */ 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; /* The TX queue control structures */ unsigned int egress_subqueue_count; struct net_device_subqueue egress_subqueue[1]; }; #define to_net_dev(d) container_of(d, struct net_device, dev) #define NETDEV_ALIGN 32 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) /* * Net namespace inlines */ static inline struct net *dev_net(const struct net_device *dev) { #ifdef CONFIG_NET_NS return dev->nd_net; #else return &init_net; #endif } static inline void dev_net_set(struct net_device *dev, struct net *net) { #ifdef CONFIG_NET_NS release_net(dev->nd_net); dev->nd_net = hold_net(net); #endif } /** * netdev_priv - access network device private data * @dev: network device * * Get network device private data */ static inline void *netdev_priv(const struct net_device *dev) { return dev->priv; } /* Set the sysfs physical device reference for the network logical device * if set prior to registration will cause a symlink during initialization. */ #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) /** * netif_napi_add - initialize a napi context * @dev: network device * @napi: napi context * @poll: polling function * @weight: default weight * * netif_napi_add() must be used to initialize a napi context prior to calling * *any* of the other napi related functions. */ static inline void netif_napi_add(struct net_device *dev, struct napi_struct *napi, int (*poll)(struct napi_struct *, int), int weight) { INIT_LIST_HEAD(&napi->poll_list); napi->poll = poll; napi->weight = weight; #ifdef CONFIG_NETPOLL napi->dev = dev; list_add(&napi->dev_list, &dev->napi_list); spin_lock_init(&napi->poll_lock); napi->poll_owner = -1; #endif set_bit(NAPI_STATE_SCHED, &napi->state); } struct packet_type { __be16 type; /* This is really htons(ether_type). */ struct net_device *dev; /* NULL is wildcarded here */ int (*func) (struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); struct sk_buff *(*gso_segment)(struct sk_buff *skb, int features); int (*gso_send_check)(struct sk_buff *skb); void *af_packet_priv; struct list_head list; }; #include <linux/interrupt.h> #include <linux/notifier.h> extern rwlock_t dev_base_lock; /* Device list lock */ #define for_each_netdev(net, d) \ list_for_each_entry(d, &(net)->dev_base_head, dev_list) #define for_each_netdev_safe(net, d, n) \ list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list) #define for_each_netdev_continue(net, d) \ list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list) #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) static inline struct net_device *next_net_device(struct net_device *dev) { struct list_head *lh; struct net *net; net = dev_net(dev); lh = dev->dev_list.next; return lh == &net->dev_base_head ? NULL : net_device_entry(lh); } static inline struct net_device *first_net_device(struct net *net) { return list_empty(&net->dev_base_head) ? NULL : net_device_entry(net->dev_base_head.next); } extern int netdev_boot_setup_check(struct net_device *dev); extern unsigned long netdev_boot_base(const char *prefix, int unit); extern struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr); extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type); extern void dev_add_pack(struct packet_type *pt); extern void dev_remove_pack(struct packet_type *pt); extern void __dev_remove_pack(struct packet_type *pt); extern struct net_device *dev_get_by_flags(struct net *net, unsigned short flags, unsigned short mask); extern struct net_device *dev_get_by_name(struct net *net, const char *name); extern struct net_device *__dev_get_by_name(struct net *net, const char *name); extern int dev_alloc_name(struct net_device *dev, const char *name); extern int dev_open(struct net_device *dev); extern int dev_close(struct net_device *dev); extern int dev_queue_xmit(struct sk_buff *skb); extern int register_netdevice(struct net_device *dev); extern void unregister_netdevice(struct net_device *dev); extern void free_netdev(struct net_device *dev); extern void synchronize_net(void); extern int register_netdevice_notifier(struct notifier_block *nb); extern int unregister_netdevice_notifier(struct notifier_block *nb); extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); extern struct net_device *dev_get_by_index(struct net *net, int ifindex); extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); extern int dev_restart(struct net_device *dev); #ifdef CONFIG_NETPOLL_TRAP extern int netpoll_trap(void); #endif static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned len) { if (!dev->header_ops || !dev->header_ops->create) return 0; return dev->header_ops->create(skb, dev, type, daddr, saddr, len); } static inline int dev_parse_header(const struct sk_buff *skb, unsigned char *haddr) { const struct net_device *dev = skb->dev; if (!dev->header_ops || !dev->header_ops->parse) return 0; return dev->header_ops->parse(skb, haddr); } typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); static inline int unregister_gifconf(unsigned int family) { return register_gifconf(family, NULL); } /* * Incoming packets are placed on per-cpu queues so that * no locking is needed. */ struct softnet_data { struct net_device *output_queue; struct sk_buff_head input_pkt_queue; struct list_head poll_list; struct sk_buff *completion_queue; struct napi_struct backlog; #ifdef CONFIG_NET_DMA struct dma_chan *net_dma; #endif }; DECLARE_PER_CPU(struct softnet_data,softnet_data); #define HAVE_NETIF_QUEUE extern void __netif_schedule(struct net_device *dev); static inline void netif_schedule(struct net_device *dev) { if (!test_bit(__LINK_STATE_XOFF, &dev->state)) __netif_schedule(dev); } /** * netif_start_queue - allow transmit * @dev: network device * * Allow upper layers to call the device hard_start_xmit routine. */ static inline void netif_start_queue(struct net_device *dev) { clear_bit(__LINK_STATE_XOFF, &dev->state); } /** * netif_wake_queue - restart transmit * @dev: network device * * Allow upper layers to call the device hard_start_xmit routine. * Used for flow control when transmit resources are available. */ static inline void netif_wake_queue(struct net_device *dev) { #ifdef CONFIG_NETPOLL_TRAP if (netpoll_trap()) { clear_bit(__LINK_STATE_XOFF, &dev->state); return; } #endif if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) __netif_schedule(dev); } /** * netif_stop_queue - stop transmitted packets * @dev: network device * * Stop upper layers calling the device hard_start_xmit routine. * Used for flow control when transmit resources are unavailable. */ static inline void netif_stop_queue(struct net_device *dev) { set_bit(__LINK_STATE_XOFF, &dev->state); } /** * netif_queue_stopped - test if transmit queue is flowblocked * @dev: network device * * Test if transmit queue on device is currently unable to send. */ static inline int netif_queue_stopped(const struct net_device *dev) { return test_bit(__LINK_STATE_XOFF, &dev->state); } /** * netif_running - test if up * @dev: network device * * Test if the device has been brought up. */ static inline int netif_running(const struct net_device *dev) { return test_bit(__LINK_STATE_START, &dev->state); } /* * Routines to manage the subqueues on a device. We only need start * stop, and a check if it's stopped. All other device management is * done at the overall netdevice level. * Also test the device if we're multiqueue. */ /** * netif_start_subqueue - allow sending packets on subqueue * @dev: network device * @queue_index: sub queue index * * Start individual transmit queue of a device with multiple transmit queues. */ static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) { #ifdef CONFIG_NETDEVICES_MULTIQUEUE clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); #endif } /** * netif_stop_subqueue - stop sending packets on subqueue * @dev: network device * @queue_index: sub queue index * * Stop individual transmit queue of a device with multiple transmit queues. */ static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) { #ifdef CONFIG_NETDEVICES_MULTIQUEUE #ifdef CONFIG_NETPOLL_TRAP if (netpoll_trap()) return; #endif set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); #endif } /** * netif_subqueue_stopped - test status of subqueue * @dev: network device * @queue_index: sub queue index * * Check individual transmit queue of a device with multiple transmit queues. */ static inline int __netif_subqueue_stopped(const struct net_device *dev, u16 queue_index) { #ifdef CONFIG_NETDEVICES_MULTIQUEUE return test_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); #else return 0; #endif } static inline int netif_subqueue_stopped(const struct net_device *dev, struct sk_buff *skb) { return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb)); } /** * netif_wake_subqueue - allow sending packets on subqueue * @dev: network device * @queue_index: sub queue index * * Resume individual transmit queue of a device with multiple transmit queues. */ static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) { #ifdef CONFIG_NETDEVICES_MULTIQUEUE #ifdef CONFIG_NETPOLL_TRAP if (netpoll_trap()) return; #endif if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state)) __netif_schedule(dev); #endif } /** * netif_is_multiqueue - test if device has multiple transmit queues * @dev: network device * * Check if device has multiple transmit queues * Always falls if NETDEVICE_MULTIQUEUE is not configured */ static inline int netif_is_multiqueue(const struct net_device *dev) { #ifdef CONFIG_NETDEVICES_MULTIQUEUE return (!!(NETIF_F_MULTI_QUEUE & dev->features)); #else return 0; #endif } /* Use this variant when it is known for sure that it * is executing from hardware interrupt context or with hardware interrupts * disabled. */ extern void dev_kfree_skb_irq(struct sk_buff *skb); /* Use this variant in places where it could be invoked * from either hardware interrupt or other context, with hardware interrupts * either disabled or enabled. */ extern void dev_kfree_skb_any(struct sk_buff *skb); #define HAVE_NETIF_RX 1 extern int netif_rx(struct sk_buff *skb); extern int netif_rx_ni(struct sk_buff *skb); #define HAVE_NETIF_RECEIVE_SKB 1 extern int netif_receive_skb(struct sk_buff *skb); extern int dev_valid_name(const char *name); extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *); extern int dev_ethtool(struct net *net, struct ifreq *); extern unsigned dev_get_flags(const struct net_device *); extern int dev_change_flags(struct net_device *, unsigned); extern int dev_change_name(struct net_device *, char *); extern int dev_change_net_namespace(struct net_device *, struct net *, const char *); extern int dev_set_mtu(struct net_device *, int); extern int dev_set_mac_address(struct net_device *, struct sockaddr *); extern int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev); extern int netdev_budget; /* Called by rtnetlink.c:rtnl_unlock() */ extern void netdev_run_todo(void); /** * dev_put - release reference to device * @dev: network device * * Release reference to device to allow it to be freed. */ static inline void dev_put(struct net_device *dev) { atomic_dec(&dev->refcnt); } /** * dev_hold - get reference to device * @dev: network device * * Hold reference to device to keep it from being freed. */ static inline void dev_hold(struct net_device *dev) { atomic_inc(&dev->refcnt); } /* Carrier loss detection, dial on demand. The functions netif_carrier_on * and _off may be called from IRQ context, but it is caller * who is responsible for serialization of these calls. * * The name carrier is inappropriate, these functions should really be * called netif_lowerlayer_*() because they represent the state of any * kind of lower layer not just hardware media. */ extern void linkwatch_fire_event(struct net_device *dev); /** * netif_carrier_ok - test if carrier present * @dev: network device * * Check if carrier is present on device */ static inline int netif_carrier_ok(const struct net_device *dev) { return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); } extern void __netdev_watchdog_up(struct net_device *dev); extern void netif_carrier_on(struct net_device *dev); extern void netif_carrier_off(struct net_device *dev); /** * netif_dormant_on - mark device as dormant. * @dev: network device * * Mark device as dormant (as per RFC2863). * * The dormant state indicates that the relevant interface is not * actually in a condition to pass packets (i.e., it is not 'up') but is * in a "pending" state, waiting for some external event. For "on- * demand" interfaces, this new state identifies the situation where the * interface is waiting for events to place it in the up state. * */ static inline void netif_dormant_on(struct net_device *dev) { if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) linkwatch_fire_event(dev); } /** * netif_dormant_off - set device as not dormant. * @dev: network device * * Device is not in dormant state. */ static inline void netif_dormant_off(struct net_device *dev) { if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) linkwatch_fire_event(dev); } /** * netif_dormant - test if carrier present * @dev: network device * * Check if carrier is present on device */ static inline int netif_dormant(const struct net_device *dev) { return test_bit(__LINK_STATE_DORMANT, &dev->state); } /** * netif_oper_up - test if device is operational * @dev: network device * * Check if carrier is operational */ static inline int netif_oper_up(const struct net_device *dev) { return (dev->operstate == IF_OPER_UP || dev->operstate == IF_OPER_UNKNOWN /* backward compat */); } /** * netif_device_present - is device available or removed * @dev: network device * * Check if device has not been removed from system. */ static inline int netif_device_present(struct net_device *dev) { return test_bit(__LINK_STATE_PRESENT, &dev->state); } extern void netif_device_detach(struct net_device *dev); extern void netif_device_attach(struct net_device *dev); /* * Network interface message level settings */ #define HAVE_NETIF_MSG 1 enum { NETIF_MSG_DRV = 0x0001, NETIF_MSG_PROBE = 0x0002, NETIF_MSG_LINK = 0x0004, NETIF_MSG_TIMER = 0x0008, NETIF_MSG_IFDOWN = 0x0010, NETIF_MSG_IFUP = 0x0020, NETIF_MSG_RX_ERR = 0x0040, NETIF_MSG_TX_ERR = 0x0080, NETIF_MSG_TX_QUEUED = 0x0100, NETIF_MSG_INTR = 0x0200, NETIF_MSG_TX_DONE = 0x0400, NETIF_MSG_RX_STATUS = 0x0800, NETIF_MSG_PKTDATA = 0x1000, NETIF_MSG_HW = 0x2000, NETIF_MSG_WOL = 0x4000, }; #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) { /* use default */ if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) return default_msg_enable_bits; if (debug_value == 0) /* no output */ return 0; /* set low N bits */ return (1 << debug_value) - 1; } /* Test if receive needs to be scheduled but only if up */ static inline int netif_rx_schedule_prep(struct net_device *dev, struct napi_struct *napi) { return napi_schedule_prep(napi); } /* Add interface to tail of rx poll list. This assumes that _prep has * already been called and returned 1. */ static inline void __netif_rx_schedule(struct net_device *dev, struct napi_struct *napi) { __napi_schedule(napi); } /* Try to reschedule poll. Called by irq handler. */ static inline void netif_rx_schedule(struct net_device *dev, struct napi_struct *napi) { if (netif_rx_schedule_prep(dev, napi)) __netif_rx_schedule(dev, napi); } /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */ static inline int netif_rx_reschedule(struct net_device *dev, struct napi_struct *napi) { if (napi_schedule_prep(napi)) { __netif_rx_schedule(dev, napi); return 1; } return 0; } /* same as netif_rx_complete, except that local_irq_save(flags) * has already been issued */ static inline void __netif_rx_complete(struct net_device *dev, struct napi_struct *napi) { __napi_complete(napi); } /* Remove interface from poll list: it must be in the poll list * on current cpu. This primitive is called by dev->poll(), when * it completes the work. The device cannot be out of poll list at this * moment, it is BUG(). */ static inline void netif_rx_complete(struct net_device *dev, struct napi_struct *napi) { unsigned long flags; local_irq_save(flags); __netif_rx_complete(dev, napi); local_irq_restore(flags); } /** * netif_tx_lock - grab network device transmit lock * @dev: network device * @cpu: cpu number of lock owner * * Get network device transmit lock */ static inline void __netif_tx_lock(struct net_device *dev, int cpu) { spin_lock(&dev->_xmit_lock); dev->xmit_lock_owner = cpu; } static inline void netif_tx_lock(struct net_device *dev) { __netif_tx_lock(dev, smp_processor_id()); } static inline void netif_tx_lock_bh(struct net_device *dev) { spin_lock_bh(&dev->_xmit_lock); dev->xmit_lock_owner = smp_processor_id(); } static inline int netif_tx_trylock(struct net_device *dev) { int ok = spin_trylock(&dev->_xmit_lock); if (likely(ok)) dev->xmit_lock_owner = smp_processor_id(); return ok; } static inline void netif_tx_unlock(struct net_device *dev) { dev->xmit_lock_owner = -1; spin_unlock(&dev->_xmit_lock); } static inline void netif_tx_unlock_bh(struct net_device *dev) { dev->xmit_lock_owner = -1; spin_unlock_bh(&dev->_xmit_lock); } #define HARD_TX_LOCK(dev, cpu) { \ if ((dev->features & NETIF_F_LLTX) == 0) { \ __netif_tx_lock(dev, cpu); \ } \ } #define HARD_TX_UNLOCK(dev) { \ if ((dev->features & NETIF_F_LLTX) == 0) { \ netif_tx_unlock(dev); \ } \ } static inline void netif_tx_disable(struct net_device *dev) { netif_tx_lock_bh(dev); netif_stop_queue(dev); netif_tx_unlock_bh(dev); } /* These functions live elsewhere (drivers/net/net_init.c, but related) */ extern void ether_setup(struct net_device *dev); /* Support for loadable net-drivers */ extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, void (*setup)(struct net_device *), unsigned int queue_count); #define alloc_netdev(sizeof_priv, name, setup) \ alloc_netdev_mq(sizeof_priv, name, setup, 1) extern int register_netdev(struct net_device *dev); extern void unregister_netdev(struct net_device *dev); /* Functions used for secondary unicast and multicast support */ extern void dev_set_rx_mode(struct net_device *dev); extern void __dev_set_rx_mode(struct net_device *dev); extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); extern int dev_unicast_sync(struct net_device *to, struct net_device *from); extern void dev_unicast_unsync(struct net_device *to, struct net_device *from); extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); extern int dev_mc_sync(struct net_device *to, struct net_device *from); extern void dev_mc_unsync(struct net_device *to, struct net_device *from); extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); extern int __dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); extern void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count); extern void dev_set_promiscuity(struct net_device *dev, int inc); extern void dev_set_allmulti(struct net_device *dev, int inc); extern void netdev_state_change(struct net_device *dev); extern void netdev_features_change(struct net_device *dev); /* Load a device via the kmod */ extern void dev_load(struct net *net, const char *name); extern void dev_mcast_init(void); extern int netdev_max_backlog; extern int weight_p; extern int netdev_set_master(struct net_device *dev, struct net_device *master); extern int skb_checksum_help(struct sk_buff *skb); extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); #ifdef CONFIG_BUG extern void netdev_rx_csum_fault(struct net_device *dev); #else static inline void netdev_rx_csum_fault(struct net_device *dev) { } #endif /* rx skb timestamps */ extern void net_enable_timestamp(void); extern void net_disable_timestamp(void); #ifdef CONFIG_PROC_FS extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); extern void dev_seq_stop(struct seq_file *seq, void *v); #endif extern void linkwatch_run_queue(void); extern int netdev_compute_features(unsigned long all, unsigned long one); static inline int net_gso_ok(int features, int gso_type) { int feature = gso_type << NETIF_F_GSO_SHIFT; return (features & feature) == feature; } static inline int skb_gso_ok(struct sk_buff *skb, int features) { return net_gso_ok(features, skb_shinfo(skb)->gso_type); } static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) { return skb_is_gso(skb) && (!skb_gso_ok(skb, dev->features) || unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); } static inline void netif_set_gso_max_size(struct net_device *dev, unsigned int size) { dev->gso_max_size = size; } /* On bonding slaves other than the currently active slave, suppress * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and * ARP on active-backup slaves with arp_validate enabled. */ static inline int skb_bond_should_drop(struct sk_buff *skb) { struct net_device *dev = skb->dev; struct net_device *master = dev->master; if (master && (dev->priv_flags & IFF_SLAVE_INACTIVE)) { if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && skb->protocol == __constant_htons(ETH_P_ARP)) return 0; if (master->priv_flags & IFF_MASTER_ALB) { if (skb->pkt_type != PACKET_BROADCAST && skb->pkt_type != PACKET_MULTICAST) return 0; } if (master->priv_flags & IFF_MASTER_8023AD && skb->protocol == __constant_htons(ETH_P_SLOW)) return 0; return 1; } return 0; } #endif /* __KERNEL__ */ #endif /* _LINUX_DEV_H */