Net_device is a vast and important structure, but it has no kernel-doc
compliant documentation. This patch extracts the comments from the structure
to clean it up, and let the scripts extract documentation from it. I know that
the patch is big, but it's just reordering of comments into the appropriate
form, and adding a few more, for the missing members.
v2:
Additional documentation added for some members (gflags,neigh_priv_len,
queues_kset, uc_promisc, promiscuity, allmulti, _rx, _tx, watchdog_timer,
rtnl_link_state, tstats, gso_max_size, gso_max_segs, num_tc, pm_qos_req).
Cleaned up trailing whitespaces and blank lines.
Fixed the beginning to indicate kernel-doc notation.
v3:
Fixed typos.
Added documentation for npinfo and stats
Signed-off-by: Karoly Kemeny <karoly.kemeny@xxxxxxxxx>
---
include/linux/netdevice.h | 381 ++++++++++++++++++++++++++++++----------------
1 file changed, 250 insertions(+), 131 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 66f9a04..4760958 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1229,42 +1229,228 @@ enum netdev_priv_flags {
#define IFF_LIVE_ADDR_CHANGE IFF_LIVE_ADDR_CHANGE
#define IFF_MACVLAN IFF_MACVLAN
-/*
- * 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.
+/**
+ * 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
+ *
+ * @state: Generic network queuing layer state, see netdev_state_t
+ * @dev_list: The global list of network devices
+ * @napi_list: List entry, that is used for polling napi devices
+ * @unreg_list: List entry, that is used, when we are unregistering the
+ * device, see the function unregister_netdev
+ * @close_list: List entry, that is used, when we are closing the device
+ *
+ * @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-changable features
+ *
+ * @wanted_features: User-requested features
+ * @vlan_features: Mask of features inheritable by VLAN devices
+ *
+ * @hw_enc_features: Mask of features inherited by enapsulating 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 intheritable by MPLS
+ *
+ * @ifindex: interface index
+ * @iflink: unique device identifier
+ *
+ * @stats: Statistics struct, wich 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
+ *
+ * @carrier_changes: Stats to monitor carrier on<->off transitions
+ *
+ * @wireless_handlers: List of functions to handle Wireless Extensions,
+ * instead of ioctl,
+ * see <net/iw_handler.h> 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
+ * @fwd_ops: Management operations
+ * @header_ops: Includes callbacks for creating,parsing,rebuilding,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: Hardware header length
+ *
+ * @needed_headroom: Extra headroom the hardware may need, but not in all
+ * cases can this be guaranteed
+ * @needed_tailroom: Extra taiéroom 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(),
+ * initialized only in atm/clip.c
+ * @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: unicast mac addresses
+ * @mc: multicas mac addresses
+ * @dev_addrs: list of device hw addresses
+ * @queues_kset: Group of all Kobjects in the Tx and RX queues
+ * @uc_promisc: Counter, that indicates, that promiscous 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()
+ * @promiscuity: Number of times, the NIC is told to work in
+ * Promiscuous mode, if it becomes 0 the NIC will
+ * exit from working in 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
+ *
+ * @_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 form 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
+ *
+ * @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
+ *
+ * @trans_start: Time (in jiffies) of last Tx
+ * @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
+ * @index_hlist: Device index hash chain
+ * @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: XXX: need comments on this one
+ *
+ * @group: The group, that the device belongs to
+ * @pm_qos_req: Power Management QoS object
*
* 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
- * of the interface.
- */
char name[IFNAMSIZ];
-
- /* device name hash chain, please keep it close to name[] */
struct hlist_node name_hlist;
-
- /* snmp alias */
char *ifalias;
-
/*
* 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 */
- int irq; /* device IRQ number */
+ unsigned long mem_end;
+ unsigned long mem_start;
+ unsigned long base_addr;
+ int irq;
/*
- * Some hardware also needs these fields, but they are not
+ * 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.
*/
@@ -1275,106 +1461,74 @@ struct net_device {
struct list_head unreg_list;
struct list_head close_list;
- /* directly linked devices, like slaves for bonding */
struct {
struct list_head upper;
struct list_head lower;
} adj_list;
- /* all linked devices, *including* neighbours */
struct {
struct list_head upper;
struct list_head lower;
} all_adj_list;
-
- /* currently active device features */
netdev_features_t features;
- /* user-changeable features */
netdev_features_t hw_features;
- /* user-requested features */
netdev_features_t wanted_features;
- /* mask of features inheritable by VLAN devices */
netdev_features_t vlan_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.
- */
netdev_features_t hw_enc_features;
- /* mask of fetures inheritable by MPLS */
netdev_features_t mpls_features;
- /* Interface index. Unique device identifier */
int ifindex;
int iflink;
struct net_device_stats stats;
- /* dropped packets by core network, Do not use this in drivers */
atomic_long_t rx_dropped;
atomic_long_t tx_dropped;
- /* Stats to monitor carrier on<->off transitions */
atomic_t carrier_changes;
#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
- /* Management operations */
const struct net_device_ops *netdev_ops;
const struct ethtool_ops *ethtool_ops;
const struct forwarding_accel_ops *fwd_ops;
- /* Hardware header description */
const struct header_ops *header_ops;
- unsigned int flags; /* interface flags (a la BSD) */
- unsigned int priv_flags; /* Like 'flags' but invisible to userspace.
- * See if.h for definitions. */
+ unsigned int flags;
+ unsigned int priv_flags;
+
unsigned short gflags;
- unsigned short padded; /* How much padding added by alloc_netdev() */
+ unsigned short padded;
- unsigned char operstate; /* RFC2863 operstate */
- unsigned char link_mode; /* mapping policy to operstate */
+ unsigned char operstate;
+ unsigned char link_mode;
- unsigned char if_port; /* Selectable AUI, TP,..*/
- unsigned char dma; /* DMA channel */
+ unsigned char if_port;
+ unsigned char dma;
- unsigned int mtu; /* interface MTU value */
- unsigned short type; /* interface hardware type */
- unsigned short hard_header_len; /* hardware hdr length */
+ unsigned int mtu;
+ unsigned short type;
+ unsigned short hard_header_len;
- /* extra head- and tailroom the hardware may need, but not in all cases
- * can this be guaranteed, especially tailroom. Some cases also use
- * LL_MAX_HEADER instead to allocate the skb.
- */
unsigned short needed_headroom;
unsigned short needed_tailroom;
/* Interface address info. */
- unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
- unsigned char addr_assign_type; /* hw address assignment type */
- unsigned char addr_len; /* hardware address length */
+ 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; /* Used to differentiate devices
- * that share the same link
- * layer address
- */
- unsigned short dev_port; /* Used to differentiate
- * devices that share the same
- * function
- */
+ unsigned short dev_id;
+ unsigned short dev_port;
spinlock_t addr_list_lock;
- struct netdev_hw_addr_list uc; /* Unicast mac addresses */
- struct netdev_hw_addr_list mc; /* Multicast mac addresses */
- struct netdev_hw_addr_list dev_addrs; /* list of device
- * hw addresses
- */
+ 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
@@ -1387,40 +1541,34 @@ struct net_device {
/* Protocol specific pointers */
#if IS_ENABLED(CONFIG_VLAN_8021Q)
- struct vlan_info __rcu *vlan_info; /* VLAN info */
+ struct vlan_info __rcu *vlan_info;
#endif
#if IS_ENABLED(CONFIG_NET_DSA)
- struct dsa_switch_tree *dsa_ptr; /* dsa specific data */
+ struct dsa_switch_tree *dsa_ptr;
#endif
#if IS_ENABLED(CONFIG_TIPC)
- struct tipc_bearer __rcu *tipc_ptr; /* TIPC specific data */
+ struct tipc_bearer __rcu *tipc_ptr;
#endif
- void *atalk_ptr; /* AppleTalk link */
- struct in_device __rcu *ip_ptr; /* IPv4 specific data */
- struct dn_dev __rcu *dn_ptr; /* DECnet specific data */
- struct inet6_dev __rcu *ip6_ptr; /* IPv6 specific data */
- void *ax25_ptr; /* AX.25 specific data */
- struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
- assign before registering */
+ 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;
/*
* Cache lines mostly used on receive path (including eth_type_trans())
*/
- unsigned long last_rx; /* Time of last Rx */
+ unsigned long last_rx;
/* Interface address info used in eth_type_trans() */
- unsigned char *dev_addr; /* hw address, (before bcast
- because most packets are
- unicast) */
+ unsigned char *dev_addr;
#ifdef CONFIG_SYSFS
struct netdev_rx_queue *_rx;
- /* Number of RX queues allocated at register_netdev() time */
unsigned int num_rx_queues;
-
- /* Number of RX queues currently active in device */
unsigned int real_num_rx_queues;
#endif
@@ -1429,33 +1577,23 @@ struct net_device {
void __rcu *rx_handler_data;
struct netdev_queue __rcu *ingress_queue;
- unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
+ unsigned char broadcast[MAX_ADDR_LEN];
/*
* Cache lines mostly used on transmit path
*/
struct netdev_queue *_tx ____cacheline_aligned_in_smp;
-
- /* Number of TX queues allocated at alloc_netdev_mq() time */
unsigned int num_tx_queues;
-
- /* Number of TX queues currently active in device */
unsigned int real_num_tx_queues;
-
- /* root qdisc from userspace point of view */
struct Qdisc *qdisc;
-
- unsigned long tx_queue_len; /* Max frames per queue allowed */
+ unsigned long tx_queue_len;
spinlock_t tx_global_lock;
#ifdef CONFIG_XPS
struct xps_dev_maps __rcu *xps_maps;
#endif
#ifdef CONFIG_RFS_ACCEL
- /* 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. */
struct cpu_rmap *rx_cpu_rmap;
#endif
@@ -1465,22 +1603,17 @@ struct net_device {
* trans_start here is expensive for high speed devices on SMP,
* please use netdev_queue->trans_start instead.
*/
- unsigned long trans_start; /* Time (in jiffies) of last Tx */
+ unsigned long trans_start;
- int watchdog_timeo; /* used by dev_watchdog() */
+ int watchdog_timeo;
struct timer_list watchdog_timer;
- /* Number of references to this device */
int __percpu *pcpu_refcnt;
-
- /* delayed register/unregister */
struct list_head todo_list;
- /* device index hash chain */
- struct hlist_node index_hlist;
+ struct hlist_node index_hlist;
struct list_head link_watch_list;
- /* register/unregister state machine */
enum { NETREG_UNINITIALIZED=0,
NETREG_REGISTERED, /* completed register_netdevice */
NETREG_UNREGISTERING, /* called unregister_netdevice */
@@ -1489,14 +1622,13 @@ struct net_device {
NETREG_DUMMY, /* dummy device for NAPI poll */
} reg_state:8;
- bool dismantle; /* device is going do be freed */
+ bool dismantle;
enum {
RTNL_LINK_INITIALIZED,
RTNL_LINK_INITIALIZING,
} rtnl_link_state:16;
- /* Called from unregister, can be used to call free_netdev */
void (*destructor)(struct net_device *dev);
#ifdef CONFIG_NETPOLL
@@ -1504,31 +1636,25 @@ struct net_device {
#endif
#ifdef CONFIG_NET_NS
- /* Network namespace this network device is inside */
struct net *nd_net;
#endif
/* mid-layer private */
union {
- void *ml_priv;
- struct pcpu_lstats __percpu *lstats; /* loopback stats */
+ void *ml_priv;
+ struct pcpu_lstats __percpu *lstats;
struct pcpu_sw_netstats __percpu *tstats;
- struct pcpu_dstats __percpu *dstats; /* dummy stats */
- struct pcpu_vstats __percpu *vstats; /* veth stats */
+ struct pcpu_dstats __percpu *dstats;
+ struct pcpu_vstats __percpu *vstats;
};
- /* GARP */
+
struct garp_port __rcu *garp_port;
- /* MRP */
struct mrp_port __rcu *mrp_port;
- /* class/net/name entry */
- struct device dev;
- /* space for optional device, statistics, and wireless sysfs groups */
+ struct device dev;
const struct attribute_group *sysfs_groups[4];
- /* space for optional per-rx queue attributes */
const struct attribute_group *sysfs_rx_queue_group;
- /* rtnetlink link ops */
const struct rtnl_link_ops *rtnl_link_ops;
/* for setting kernel sock attribute on TCP connection setup */
@@ -1538,7 +1664,6 @@ struct net_device {
u16 gso_max_segs;
#ifdef CONFIG_DCB
- /* Data Center Bridging netlink ops */
const struct dcbnl_rtnl_ops *dcbnl_ops;
#endif
u8 num_tc;
@@ -1546,20 +1671,14 @@ struct net_device {
u8 prio_tc_map[TC_BITMASK + 1];
#if IS_ENABLED(CONFIG_FCOE)
- /* max exchange id for FCoE LRO by ddp */
unsigned int fcoe_ddp_xid;
#endif
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
struct netprio_map __rcu *priomap;
#endif
- /* phy device may attach itself for hardware timestamping */
struct phy_device *phydev;
-
struct lock_class_key *qdisc_tx_busylock;
-
- /* group the device belongs to */
int group;
-
struct pm_qos_request pm_qos_req;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
