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};
         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;
       #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];
       #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
       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.

       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

       {unnamed_struct}
           anonymous

       garp_port
           GARP

       mrp_port
           MRP

       dev
           Class/net/name entry

       sysfs_groups[4]
           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[TC_MAX_QUEUE]
           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.

DESCRIPTION
       interface address info:

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

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                      STRUCT NET_DEVICE(9)