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STRUCT NET_DEVICE(9) Network device support STRUCT NET_DEVICE(9)

NAME

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.

SYNOPSIS

struct net_device {
  char name[IFNAMSIZ];
  struct hlist_node name_hlist;
  char * ifalias;
  unsigned long mem_end;
  unsigned long mem_start;
  unsigned long base_addr;
  int irq;
  atomic_t carrier_changes;
  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 {unnamed_struct};
#if IS_ENABLED(CONFIG_GARP)
  struct garp_port __rcu * garp_port;
#endif
#if IS_ENABLED(CONFIG_MRP)
  struct mrp_port __rcu * mrp_port;
#endif
  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;
#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;
};

MEMBERS

char name[IFNAMSIZ]
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.

struct hlist_node name_hlist

Device name hash chain, please keep it close to name[]

char * ifalias

SNMP alias

unsigned long mem_end

Shared memory end

unsigned long mem_start

Shared memory start

unsigned long base_addr

Device I/O address

int irq

Device IRQ number

atomic_t carrier_changes

Stats to monitor carrier on<->off transitions

unsigned long state

Generic network queuing layer state, see netdev_state_t

struct list_head dev_list

The global list of network devices

struct list_head napi_list

List entry used for polling NAPI devices

struct list_head unreg_list

List entry when we are unregistering the device; see the function unregister_netdev

struct list_head close_list

List entry used when we are closing the device

struct list_head ptype_all

Device-specific packet handlers for all protocols

struct list_head ptype_specific

Device-specific, protocol-specific packet handlers

struct {unnamed_struct}

anonymous

struct garp_port __rcu * garp_port

GARP

struct mrp_port __rcu * mrp_port

MRP

struct device dev

Class/net/name entry

const struct attribute_group * sysfs_groups[4]

Space for optional device, statistics and wireless sysfs groups

const struct attribute_group * sysfs_rx_queue_group

Space for optional per-rx queue attributes

const struct rtnl_link_ops * rtnl_link_ops

Rtnl_link_ops

unsigned int gso_max_size

Maximum size of generic segmentation offload

u16 gso_max_segs

Maximum number of segments that can be passed to the NIC for GSO

const struct dcbnl_rtnl_ops * dcbnl_ops

Data Center Bridging netlink ops

u8 num_tc

Number of traffic classes in the net device

struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]

XXX: need comments on this one

u8 prio_tc_map[TC_BITMASK + 1]

XXX: need comments on this one

unsigned int fcoe_ddp_xid

Max exchange id for FCoE LRO by ddp

struct netprio_map __rcu * priomap

XXX: need comments on this one

struct phy_device * phydev

Physical device may attach itself for hardware timestamping

struct lock_class_key * qdisc_tx_busylock

lockdep class annotating Qdisc->busylock spinlock

struct lock_class_key * qdisc_running_key

lockdep class annotating Qdisc->running seqcount

bool proto_down

protocol port state information can be sent to the switch driver and used to set the phys state of the switch port.

DESCRIPTION

interface address info:

FIXME: cleanup struct net_device such that network protocol info moves out.

COPYRIGHT

July 2017 Kernel Hackers Manual 4.11