netdevice.h 90.3 KB
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/*
 * 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
 *
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 * Authors:	Ross Biro
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 *		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>
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 *		Alan Cox, <alan@lxorguk.ukuu.org.uk>
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 *		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

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#include <linux/pm_qos.h>
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#include <linux/timer.h>
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#include <linux/bug.h>
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#include <linux/delay.h>
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#include <linux/atomic.h>
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#include <asm/cache.h>
#include <asm/byteorder.h>

#include <linux/percpu.h>
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#include <linux/rculist.h>
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#include <linux/dmaengine.h>
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#include <linux/workqueue.h>
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#include <linux/dynamic_queue_limits.h>
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#include <linux/ethtool.h>
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#include <net/net_namespace.h>
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#include <net/dsa.h>
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#ifdef CONFIG_DCB
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#include <net/dcbnl.h>
#endif
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#include <net/netprio_cgroup.h>
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#include <linux/netdev_features.h>
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#include <linux/neighbour.h>
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#include <uapi/linux/netdevice.h>
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struct netpoll_info;
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struct device;
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struct phy_device;
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/* 802.11 specific */
struct wireless_dev;
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					/* source back-compat hooks */
#define SET_ETHTOOL_OPS(netdev,ops) \
	( (netdev)->ethtool_ops = (ops) )

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extern void netdev_set_default_ethtool_ops(struct net_device *dev,
					   const struct ethtool_ops *ops);

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/* hardware address assignment types */
#define NET_ADDR_PERM		0	/* address is permanent (default) */
#define NET_ADDR_RANDOM		1	/* address is generated randomly */
#define NET_ADDR_STOLEN		2	/* address is stolen from other device */
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#define NET_ADDR_SET		3	/* address is set using
					 * dev_set_mac_address() */
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/* Backlog congestion levels */
#define NET_RX_SUCCESS		0	/* keep 'em coming, baby */
#define NET_RX_DROP		1	/* packet dropped */

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/*
 * Transmit return codes: transmit return codes originate from three different
 * namespaces:
 *
 * - qdisc return codes
 * - driver transmit return codes
 * - errno values
 *
 * Drivers are allowed to return any one of those in their hard_start_xmit()
 * function. Real network devices commonly used with qdiscs should only return
 * the driver transmit return codes though - when qdiscs are used, the actual
 * transmission happens asynchronously, so the value is not propagated to
 * higher layers. Virtual network devices transmit synchronously, in this case
 * the driver transmit return codes are consumed by dev_queue_xmit(), all
 * others are propagated to higher layers.
 */

/* qdisc ->enqueue() return codes. */
#define NET_XMIT_SUCCESS	0x00
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#define NET_XMIT_DROP		0x01	/* skb dropped			*/
#define NET_XMIT_CN		0x02	/* congestion notification	*/
#define NET_XMIT_POLICED	0x03	/* skb is shot by police	*/
#define NET_XMIT_MASK		0x0f	/* qdisc flags in net/sch_generic.h */
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/* 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. */
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#define net_xmit_eval(e)	((e) == NET_XMIT_CN ? 0 : (e))
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#define net_xmit_errno(e)	((e) != NET_XMIT_CN ? -ENOBUFS : 0)

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/* Driver transmit return codes */
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#define NETDEV_TX_MASK		0xf0
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enum netdev_tx {
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	__NETDEV_TX_MIN	 = INT_MIN,	/* make sure enum is signed */
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	NETDEV_TX_OK	 = 0x00,	/* driver took care of packet */
	NETDEV_TX_BUSY	 = 0x10,	/* driver tx path was busy*/
	NETDEV_TX_LOCKED = 0x20,	/* driver tx lock was already taken */
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};
typedef enum netdev_tx netdev_tx_t;

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/*
 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
 */
static inline bool dev_xmit_complete(int rc)
{
	/*
	 * Positive cases with an skb consumed by a driver:
	 * - successful transmission (rc == NETDEV_TX_OK)
	 * - error while transmitting (rc < 0)
	 * - error while queueing to a different device (rc & NET_XMIT_MASK)
	 */
	if (likely(rc < NET_XMIT_MASK))
		return true;

	return false;
}

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/*
 *	Compute the worst case header length according to the protocols
 *	used.
 */
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#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
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# if defined(CONFIG_MAC80211_MESH)
#  define LL_MAX_HEADER 128
# else
#  define LL_MAX_HEADER 96
# endif
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#else
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# define LL_MAX_HEADER 32
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#endif

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#if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
    !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
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#define MAX_HEADER LL_MAX_HEADER
#else
#define MAX_HEADER (LL_MAX_HEADER + 48)
#endif

/*
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 *	Old network device statistics. Fields are native words
 *	(unsigned long) so they can be read and written atomically.
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 */
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struct net_device_stats {
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	unsigned long	rx_packets;
	unsigned long	tx_packets;
	unsigned long	rx_bytes;
	unsigned long	tx_bytes;
	unsigned long	rx_errors;
	unsigned long	tx_errors;
	unsigned long	rx_dropped;
	unsigned long	tx_dropped;
	unsigned long	multicast;
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	unsigned long	collisions;
	unsigned long	rx_length_errors;
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	unsigned long	rx_over_errors;
	unsigned long	rx_crc_errors;
	unsigned long	rx_frame_errors;
	unsigned long	rx_fifo_errors;
	unsigned long	rx_missed_errors;
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	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;
	unsigned long	rx_compressed;
	unsigned long	tx_compressed;
};


#include <linux/cache.h>
#include <linux/skbuff.h>

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#ifdef CONFIG_RPS
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#include <linux/static_key.h>
extern struct static_key rps_needed;
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#endif

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struct neighbour;
struct neigh_parms;
struct sk_buff;

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struct netdev_hw_addr {
	struct list_head	list;
	unsigned char		addr[MAX_ADDR_LEN];
	unsigned char		type;
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#define NETDEV_HW_ADDR_T_LAN		1
#define NETDEV_HW_ADDR_T_SAN		2
#define NETDEV_HW_ADDR_T_SLAVE		3
#define NETDEV_HW_ADDR_T_UNICAST	4
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#define NETDEV_HW_ADDR_T_MULTICAST	5
	bool			global_use;
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	int			sync_cnt;
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	int			refcount;
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	int			synced;
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	struct rcu_head		rcu_head;
};

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struct netdev_hw_addr_list {
	struct list_head	list;
	int			count;
};

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#define netdev_hw_addr_list_count(l) ((l)->count)
#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
#define netdev_hw_addr_list_for_each(ha, l) \
	list_for_each_entry(ha, &(l)->list, list)
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#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
#define netdev_for_each_uc_addr(ha, dev) \
	netdev_hw_addr_list_for_each(ha, &(dev)->uc)
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#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
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#define netdev_for_each_mc_addr(ha, dev) \
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	netdev_hw_addr_list_for_each(ha, &(dev)->mc)
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struct hh_cache {
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	u16		hh_len;
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	u16		__pad;
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	seqlock_t	hh_lock;
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	/* cached hardware header; allow for machine alignment needs.        */
#define HH_DATA_MOD	16
#define HH_DATA_OFF(__len) \
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	(HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
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#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) \
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	((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
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	((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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struct header_ops {
	int	(*create) (struct sk_buff *skb, struct net_device *dev,
			   unsigned short type, const void *daddr,
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			   const void *saddr, unsigned int len);
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	int	(*parse)(const struct sk_buff *skb, unsigned char *haddr);
	int	(*rebuild)(struct sk_buff *skb);
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	int	(*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
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	void	(*cache_update)(struct hh_cache *hh,
				const struct net_device *dev,
				const unsigned char *haddr);
};

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/* These flag bits are private to the generic network queueing
 * layer, they may not be explicitly referenced by any other
 * code.
 */

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enum netdev_state_t {
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	__LINK_STATE_START,
	__LINK_STATE_PRESENT,
	__LINK_STATE_NOCARRIER,
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	__LINK_STATE_LINKWATCH_PENDING,
	__LINK_STATE_DORMANT,
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};


/*
 * This structure holds at boot time configured netdevice settings. They
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 * are then used in the device probing.
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 */
struct netdev_boot_setup {
	char name[IFNAMSIZ];
	struct ifmap map;
};
#define NETDEV_BOOT_SETUP_MAX 8

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extern int __init netdev_boot_setup(char *str);
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/*
 * 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;
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	unsigned int		gro_count;
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	int			(*poll)(struct napi_struct *, int);
#ifdef CONFIG_NETPOLL
	spinlock_t		poll_lock;
	int			poll_owner;
#endif
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	struct net_device	*dev;
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	struct sk_buff		*gro_list;
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	struct sk_buff		*skb;
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	struct list_head	dev_list;
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};

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enum {
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	NAPI_STATE_SCHED,	/* Poll is scheduled */
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	NAPI_STATE_DISABLE,	/* Disable pending */
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	NAPI_STATE_NPSVC,	/* Netpoll - don't dequeue from poll_list */
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};

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enum gro_result {
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	GRO_MERGED,
	GRO_MERGED_FREE,
	GRO_HELD,
	GRO_NORMAL,
	GRO_DROP,
};
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typedef enum gro_result gro_result_t;
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/*
 * enum rx_handler_result - Possible return values for rx_handlers.
 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
 * further.
 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
 * case skb->dev was changed by rx_handler.
 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
 *
 * rx_handlers are functions called from inside __netif_receive_skb(), to do
 * special processing of the skb, prior to delivery to protocol handlers.
 *
 * Currently, a net_device can only have a single rx_handler registered. Trying
 * to register a second rx_handler will return -EBUSY.
 *
 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
 * To unregister a rx_handler on a net_device, use
 * netdev_rx_handler_unregister().
 *
 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
 * do with the skb.
 *
 * If the rx_handler consumed to skb in some way, it should return
 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
 * the skb to be delivered in some other ways.
 *
 * If the rx_handler changed skb->dev, to divert the skb to another
 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
 * new device will be called if it exists.
 *
 * If the rx_handler consider the skb should be ignored, it should return
 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
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 * are registered on exact device (ptype->dev == skb->dev).
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 *
 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
 * delivered, it should return RX_HANDLER_PASS.
 *
 * A device without a registered rx_handler will behave as if rx_handler
 * returned RX_HANDLER_PASS.
 */

enum rx_handler_result {
	RX_HANDLER_CONSUMED,
	RX_HANDLER_ANOTHER,
	RX_HANDLER_EXACT,
	RX_HANDLER_PASS,
};
typedef enum rx_handler_result rx_handler_result_t;
typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
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extern void __napi_schedule(struct napi_struct *n);
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static inline bool napi_disable_pending(struct napi_struct *n)
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{
	return test_bit(NAPI_STATE_DISABLE, &n->state);
}

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/**
 *	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
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 * insure only one NAPI poll instance runs.  We also make
 * sure there is no pending NAPI disable.
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 */
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static inline bool napi_schedule_prep(struct napi_struct *n)
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{
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	return !napi_disable_pending(n) &&
		!test_and_set_bit(NAPI_STATE_SCHED, &n->state);
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}

/**
 *	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);
}

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/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
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static inline bool napi_reschedule(struct napi_struct *napi)
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{
	if (napi_schedule_prep(napi)) {
		__napi_schedule(napi);
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		return true;
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	}
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	return false;
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}

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/**
 *	napi_complete - NAPI processing complete
 *	@n: napi context
 *
 * Mark NAPI processing as complete.
 */
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extern void __napi_complete(struct napi_struct *n);
extern void napi_complete(struct napi_struct *n);
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/**
 *	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)
{
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	set_bit(NAPI_STATE_DISABLE, &n->state);
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	while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
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		msleep(1);
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	clear_bit(NAPI_STATE_DISABLE, &n->state);
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}

/**
 *	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);
}

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#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

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enum netdev_queue_state_t {
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	__QUEUE_STATE_DRV_XOFF,
	__QUEUE_STATE_STACK_XOFF,
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	__QUEUE_STATE_FROZEN,
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#define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF)		| \
			      (1 << __QUEUE_STATE_STACK_XOFF))
#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF		| \
					(1 << __QUEUE_STATE_FROZEN))
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};
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/*
 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
 * netif_tx_* functions below are used to manipulate this flag.  The
 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
 * queue independently.  The netif_xmit_*stopped functions below are called
 * to check if the queue has been stopped by the driver or stack (either
 * of the XOFF bits are set in the state).  Drivers should not need to call
 * netif_xmit*stopped functions, they should only be using netif_tx_*.
 */
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struct netdev_queue {
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/*
 * read mostly part
 */
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	struct net_device	*dev;
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	struct Qdisc		*qdisc;
	struct Qdisc		*qdisc_sleeping;
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#ifdef CONFIG_SYSFS
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	struct kobject		kobj;
#endif
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#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	int			numa_node;
#endif
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/*
 * write mostly part
 */
	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
	int			xmit_lock_owner;
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	/*
	 * please use this field instead of dev->trans_start
	 */
	unsigned long		trans_start;
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	/*
	 * Number of TX timeouts for this queue
	 * (/sys/class/net/DEV/Q/trans_timeout)
	 */
	unsigned long		trans_timeout;
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	unsigned long		state;

#ifdef CONFIG_BQL
	struct dql		dql;
#endif
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} ____cacheline_aligned_in_smp;
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static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
{
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	return q->numa_node;
#else
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	return NUMA_NO_NODE;
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#endif
}

static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
{
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	q->numa_node = node;
#endif
}

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#ifdef CONFIG_RPS
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/*
 * This structure holds an RPS map which can be of variable length.  The
 * map is an array of CPUs.
 */
struct rps_map {
	unsigned int len;
	struct rcu_head rcu;
	u16 cpus[0];
};
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#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
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/*
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 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
 * tail pointer for that CPU's input queue at the time of last enqueue, and
 * a hardware filter index.
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 */
struct rps_dev_flow {
	u16 cpu;
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	u16 filter;
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	unsigned int last_qtail;
};
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#define RPS_NO_FILTER 0xffff
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/*
 * The rps_dev_flow_table structure contains a table of flow mappings.
 */
struct rps_dev_flow_table {
	unsigned int mask;
	struct rcu_head rcu;
	struct rps_dev_flow flows[0];
};
#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
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    ((_num) * sizeof(struct rps_dev_flow)))
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/*
 * The rps_sock_flow_table contains mappings of flows to the last CPU
 * on which they were processed by the application (set in recvmsg).
 */
struct rps_sock_flow_table {
	unsigned int mask;
	u16 ents[0];
};
#define	RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
610
    ((_num) * sizeof(u16)))
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#define RPS_NO_CPU 0xffff

static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
					u32 hash)
{
	if (table && hash) {
		unsigned int cpu, index = hash & table->mask;

		/* We only give a hint, preemption can change cpu under us */
		cpu = raw_smp_processor_id();

		if (table->ents[index] != cpu)
			table->ents[index] = cpu;
	}
}

static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
				       u32 hash)
{
	if (table && hash)
		table->ents[hash & table->mask] = RPS_NO_CPU;
}

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extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
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#ifdef CONFIG_RFS_ACCEL
extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
				u32 flow_id, u16 filter_id);
#endif

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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
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	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
	struct kobject			kobj;
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	struct net_device		*dev;
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} ____cacheline_aligned_in_smp;
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#endif /* CONFIG_RPS */
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#ifdef CONFIG_XPS
/*
 * This structure holds an XPS map which can be of variable length.  The
 * map is an array of queues.
 */
struct xps_map {
	unsigned int len;
	unsigned int alloc_len;
	struct rcu_head rcu;
	u16 queues[0];
};
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#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
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#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))	\
    / sizeof(u16))

/*
 * This structure holds all XPS maps for device.  Maps are indexed by CPU.
 */
struct xps_dev_maps {
	struct rcu_head rcu;
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	struct xps_map __rcu *cpu_map[0];
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};
#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +		\
    (nr_cpu_ids * sizeof(struct xps_map *)))
#endif /* CONFIG_XPS */

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#define TC_MAX_QUEUE	16
#define TC_BITMASK	15
/* HW offloaded queuing disciplines txq count and offset maps */
struct netdev_tc_txq {
	u16 count;
	u16 offset;
};

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#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
/*
 * This structure is to hold information about the device
 * configured to run FCoE protocol stack.
 */
struct netdev_fcoe_hbainfo {
	char	manufacturer[64];
	char	serial_number[64];
	char	hardware_version[64];
	char	driver_version[64];
	char	optionrom_version[64];
	char	firmware_version[64];
	char	model[256];
	char	model_description[256];
};
#endif

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/*
 * This structure defines the management hooks for network devices.
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 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
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 *
 * int (*ndo_init)(struct net_device *dev);
 *     This function is called once when network device is registered.
 *     The network device can use this to any late stage initializaton
 *     or semantic validattion. It can fail with an error code which will
 *     be propogated back to register_netdev
 *
 * void (*ndo_uninit)(struct net_device *dev);
 *     This function is called when device is unregistered or when registration
 *     fails. It is not called if init fails.
 *
 * int (*ndo_open)(struct net_device *dev);
 *     This function is called when network device transistions to the up
 *     state.
 *
 * int (*ndo_stop)(struct net_device *dev);
 *     This function is called when network device transistions to the down
 *     state.
 *
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 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
727
 *	Called when a packet needs to be transmitted.
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 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
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 *	Required can not be NULL.
 *
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 *	Called to decide which queue to when device supports multiple
 *	transmit queues.
 *
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 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 *	This function is called to allow device receiver to make
 *	changes to configuration when multicast or promiscious is enabled.
 *
 * void (*ndo_set_rx_mode)(struct net_device *dev);
 *	This function is called device changes address list filtering.
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 *	If driver handles unicast address filtering, it should set
 *	IFF_UNICAST_FLT to its priv_flags.
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 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *	This function  is called when the Media Access Control address
747
 *	needs to be changed. If this interface is not defined, the
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
 *	mac address can not be changed.
 *
 * int (*ndo_validate_addr)(struct net_device *dev);
 *	Test if Media Access Control address is valid for the device.
 *
 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 *	Called when a user request an ioctl which can't be handled by
 *	the generic interface code. If not defined ioctl's return
 *	not supported error code.
 *
 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 *	Used to set network devices bus interface parameters. This interface
 *	is retained for legacy reason, new devices should use the bus
 *	interface (PCI) for low level management.
 *
 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 *	Called when a user wants to change the Maximum Transfer Unit
 *	of a device. If not defined, any request to change MTU will
 *	will return an error.
 *
768
 * void (*ndo_tx_timeout)(struct net_device *dev);
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 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
772
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
773
 *                      struct rtnl_link_stats64 *storage);
774
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
775
 *	Called when a user wants to get the network device usage
776
 *	statistics. Drivers must do one of the following:
777 778
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
779
 *	2. Define @ndo_get_stats to update a net_device_stats structure
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 *	   (which should normally be dev->stats) and return a pointer to
 *	   it. The structure may be changed asynchronously only if each
 *	   field is written atomically.
 *	3. Update dev->stats asynchronously and atomically, and define
 *	   neither operation.
785
 *
786 787 788
 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16t vid);
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is registered.
789
 *
790
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
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 *	If device support VLAN filtering this function is called when a
 *	VLAN id is unregistered.
793 794
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
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 *
 *	SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
800
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
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 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
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 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 *			  struct nlattr *port[]);
 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
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 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
 * 	Called to setup 'tc' number of traffic classes in the net device. This
 * 	is always called from the stack with the rtnl lock held and netif tx
 * 	queues stopped. This allows the netdevice to perform queue management
 * 	safely.
811
 *
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
 *	Fiber Channel over Ethernet (FCoE) offload functions.
 * int (*ndo_fcoe_enable)(struct net_device *dev);
 *	Called when the FCoE protocol stack wants to start using LLD for FCoE
 *	so the underlying device can perform whatever needed configuration or
 *	initialization to support acceleration of FCoE traffic.
 *
 * int (*ndo_fcoe_disable)(struct net_device *dev);
 *	Called when the FCoE protocol stack wants to stop using LLD for FCoE
 *	so the underlying device can perform whatever needed clean-ups to
 *	stop supporting acceleration of FCoE traffic.
 *
 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
 *			     struct scatterlist *sgl, unsigned int sgc);
 *	Called when the FCoE Initiator wants to initialize an I/O that
 *	is a possible candidate for Direct Data Placement (DDP). The LLD can
 *	perform necessary setup and returns 1 to indicate the device is set up
 *	successfully to perform DDP on this I/O, otherwise this returns 0.
 *
 * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
 *	Called when the FCoE Initiator/Target is done with the DDPed I/O as
 *	indicated by the FC exchange id 'xid', so the underlying device can
 *	clean up and reuse resources for later DDP requests.
 *
 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
 *			      struct scatterlist *sgl, unsigned int sgc);
 *	Called when the FCoE Target wants to initialize an I/O that
 *	is a possible candidate for Direct Data Placement (DDP). The LLD can
 *	perform necessary setup and returns 1 to indicate the device is set up
 *	successfully to perform DDP on this I/O, otherwise this returns 0.
 *
842 843 844 845 846 847 848
 * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
 *			       struct netdev_fcoe_hbainfo *hbainfo);
 *	Called when the FCoE Protocol stack wants information on the underlying
 *	device. This information is utilized by the FCoE protocol stack to
 *	register attributes with Fiber Channel management service as per the
 *	FC-GS Fabric Device Management Information(FDMI) specification.
 *
849 850 851 852 853 854
 * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
 *	Called when the underlying device wants to override default World Wide
 *	Name (WWN) generation mechanism in FCoE protocol stack to pass its own
 *	World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
 *	protocol stack to use.
 *
855 856 857 858 859 860
 *	RFS acceleration.
 * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
 *			    u16 rxq_index, u32 flow_id);
 *	Set hardware filter for RFS.  rxq_index is the target queue index;
 *	flow_id is a flow ID to be passed to rps_may_expire_flow() later.
 *	Return the filter ID on success, or a negative error code.
861
 *
862
 *	Slave management functions (for bridge, bonding, etc).
863 864 865 866 867
 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
 *	Called to make another netdev an underling.
 *
 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
 *	Called to release previously enslaved netdev.
868 869
 *
 *      Feature/offload setting functions.
870 871
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *		netdev_features_t features);
872 873 874 875
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
876
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
877 878 879 880
 *	Called to update device configuration to new features. Passed
 *	feature set might be less than what was returned by ndo_fix_features()).
 *	Must return >0 or -errno if it changed dev->features itself.
 *
881 882
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
883
 *		      const unsigned char *addr, u16 flags)
884
 *	Adds an FDB entry to dev for addr.
885 886
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
887
 *		      const unsigned char *addr)
888 889 890 891 892
 *	Deletes the FDB entry from dev coresponding to addr.
 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
 *		       struct net_device *dev, int idx)
 *	Used to add FDB entries to dump requests. Implementers should add
 *	entries to skb and update idx with the number of entries.
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 *
 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh)
 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
896
 *			     struct net_device *dev, u32 filter_mask)
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 *
 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
 *	Called to change device carrier. Soft-devices (like dummy, team, etc)
 *	which do not represent real hardware may define this to allow their
 *	userspace components to manage their virtual carrier state. Devices
 *	that determine carrier state from physical hardware properties (eg
 *	network cables) or protocol-dependent mechanisms (eg
 *	USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
905 906 907 908 909 910
 */
struct net_device_ops {
	int			(*ndo_init)(struct net_device *dev);
	void			(*ndo_uninit)(struct net_device *dev);
	int			(*ndo_open)(struct net_device *dev);
	int			(*ndo_stop)(struct net_device *dev);
911
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
912 913 914
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
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	void			(*ndo_change_rx_flags)(struct net_device *dev,
						       int flags);
	void			(*ndo_set_rx_mode)(struct net_device *dev);
	int			(*ndo_set_mac_address)(struct net_device *dev,
						       void *addr);
	int			(*ndo_validate_addr)(struct net_device *dev);
	int			(*ndo_do_ioctl)(struct net_device *dev,
					        struct ifreq *ifr, int cmd);
	int			(*ndo_set_config)(struct net_device *dev,
					          struct ifmap *map);
925 926 927 928
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
929 930
	void			(*ndo_tx_timeout) (struct net_device *dev);

931 932
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
933 934
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

935
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
936
						       __be16 proto, u16 vid);
937
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
938
						        __be16 proto, u16 vid);
939 940
#ifdef CONFIG_NET_POLL_CONTROLLER
	void                    (*ndo_poll_controller)(struct net_device *dev);
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	int			(*ndo_netpoll_setup)(struct net_device *dev,
942 943
						     struct netpoll_info *info,
						     gfp_t gfp);
944
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
945
#endif
946 947 948 949 950 951
	int			(*ndo_set_vf_mac)(struct net_device *dev,
						  int queue, u8 *mac);
	int			(*ndo_set_vf_vlan)(struct net_device *dev,
						   int queue, u16 vlan, u8 qos);
	int			(*ndo_set_vf_tx_rate)(struct net_device *dev,
						      int vf, int rate);
952 953
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
954 955 956
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
957 958 959 960 961
	int			(*ndo_set_vf_port)(struct net_device *dev,
						   int vf,
						   struct nlattr *port[]);
	int			(*ndo_get_vf_port)(struct net_device *dev,
						   int vf, struct sk_buff *skb);
962
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
963
#if IS_ENABLED(CONFIG_FCOE)
964 965
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
966 967 968 969 970 971
	int			(*ndo_fcoe_ddp_setup)(struct net_device *dev,
						      u16 xid,
						      struct scatterlist *sgl,
						      unsigned int sgc);
	int			(*ndo_fcoe_ddp_done)(struct net_device *dev,
						     u16 xid);
972 973 974 975
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
976 977
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
978 979
#endif

980
#if IS_ENABLED(CONFIG_LIBFCOE)
981 982 983 984
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
985
#endif
986

987 988 989 990 991 992
#ifdef CONFIG_RFS_ACCEL
	int			(*ndo_rx_flow_steer)(struct net_device *dev,
						     const struct sk_buff *skb,
						     u16 rxq_index,
						     u32 flow_id);
#endif
993 994 995 996
	int			(*ndo_add_slave)(struct net_device *dev,
						 struct net_device *slave_dev);
	int			(*ndo_del_slave)(struct net_device *dev,
						 struct net_device *slave_dev);
997 998
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
999
	int			(*ndo_set_features)(struct net_device *dev,
1000
						    netdev_features_t features);
1001
	int			(*ndo_neigh_construct)(struct neighbour *n);
1002
	void			(*ndo_neigh_destroy)(struct neighbour *n);
1003 1004

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1005
					       struct nlattr *tb[],
1006
					       struct net_device *dev,
1007
					       const unsigned char *addr,
1008 1009
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1010
					       struct nlattr *tb[],
1011
					       struct net_device *dev,
1012
					       const unsigned char *addr);
1013 1014 1015 1016
	int			(*ndo_fdb_dump)(struct sk_buff *skb,
						struct netlink_callback *cb,
						struct net_device *dev,
						int idx);
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	int			(*ndo_bridge_setlink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
						      u32 pid, u32 seq,
1022 1023
						      struct net_device *dev,
						      u32 filter_mask);
1024 1025
	int			(*ndo_bridge_dellink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
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	int			(*ndo_change_carrier)(struct net_device *dev,
						      bool new_carrier);
1028 1029
};

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/*
 *	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.
 */

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struct net_device {
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	/*
	 * 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
1045
	 * of the interface.
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	 */
	char			name[IFNAMSIZ];
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1049
	/* device name hash chain, please keep it close to name[] */
1050
	struct hlist_node	name_hlist;
1051

1052 1053
	/* snmp alias */
	char 			*ifalias;
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	/*
	 *	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 long		state;

1071
	struct list_head	dev_list;
1072
	struct list_head	napi_list;
1073
	struct list_head	unreg_list;
1074 1075
	struct list_head	upper_dev_list; /* List of upper devices */

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1077
	/* currently active device features */
1078
	netdev_features_t	features;
1079
	/* user-changeable features */
1080
	netdev_features_t	hw_features;
1081
	/* user-requested features */
1082
	netdev_features_t	wanted_features;
1083
	/* mask of features inheritable by VLAN devices */
1084
	netdev_features_t	vlan_features;
1085 1086 1087 1088 1089 1090
	/* 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;
1091

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1092 1093 1094 1095
	/* Interface index. Unique device identifier	*/
	int			ifindex;
	int			iflink;

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1096
	struct net_device_stats	stats;
1097 1098 1099
	atomic_long_t		rx_dropped; /* dropped packets by core network
					     * Do not use this in drivers.
					     */
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1101
#ifdef CONFIG_WIRELESS_EXT
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1102 1103 1104 1105 1106
	/* 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;
1107
#endif
1108 1109
	/* Management operations */
	const struct net_device_ops *netdev_ops;
1110
	const struct ethtool_ops *ethtool_ops;
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1112 1113 1114
	/* Hardware header description */
	const struct header_ops *header_ops;

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1115
	unsigned int		flags;	/* interface flags (a la BSD)	*/
1116 1117
	unsigned int		priv_flags; /* Like 'flags' but invisible to userspace.
					     * See if.h for definitions. */
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1118 1119 1120
	unsigned short		gflags;
	unsigned short		padded;	/* How much padding added by alloc_netdev() */

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1121 1122 1123
	unsigned char		operstate; /* RFC2863 operstate */
	unsigned char		link_mode; /* mapping policy to operstate */

1124 1125 1126
	unsigned char		if_port;	/* Selectable AUI, TP,..*/
	unsigned char		dma;		/* DMA channel		*/

1127
	unsigned int		mtu;	/* interface MTU value		*/
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1128 1129 1130
	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

1131 1132 1133 1134 1135 1136 1137
	/* 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;

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1138
	/* Interface address info. */
1139
	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1140
	unsigned char		addr_assign_type; /* hw address assignment type */
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1141
	unsigned char		addr_len;	/* hardware address length	*/
1142
	unsigned char		neigh_priv_len;
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1143 1144
	unsigned short          dev_id;		/* for shared network cards */

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1145
	spinlock_t		addr_list_lock;
1146 1147
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
1148 1149 1150 1151 1152 1153 1154
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						    * hw addresses
						    */
#ifdef CONFIG_SYSFS
	struct kset		*queues_kset;
#endif

1155
	bool			uc_promisc;
1156 1157
	unsigned int		promiscuity;
	unsigned int		allmulti;
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	/* Protocol specific pointers */
1161

1162
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1163
	struct vlan_info __rcu	*vlan_info;	/* VLAN info */
1164
#endif
1165
#if IS_ENABLED(CONFIG_NET_DSA)
1166
	struct dsa_switch_tree	*dsa_ptr;	/* dsa specific data */
1167
#endif
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	void 			*atalk_ptr;	/* AppleTalk link 	*/
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1169
	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
1170
	struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
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	struct inet6_dev __rcu	*ip6_ptr;       /* IPv6 specific data */
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	void			*ax25_ptr;	/* AX.25 specific data */
1173 1174
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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1176
/*
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 * Cache lines mostly used on receive path (including eth_type_trans())
1178
 */
1179 1180 1181 1182 1183 1184 1185 1186
	unsigned long		last_rx;	/* Time of last Rx
						 * This should not be set in
						 * drivers, unless really needed,
						 * because network stack (bonding)
						 * use it if/when necessary, to
						 * avoid dirtying this cache line.
						 */

1187
	/* Interface address info used in eth_type_trans() */
1188 1189 1190 1191
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

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1192

1193
#ifdef CONFIG_RPS
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1194 1195
	struct netdev_rx_queue	*_rx;

1196
	/* Number of RX queues allocated at register_netdev() time */
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	unsigned int		num_rx_queues;
1198 1199 1200

	/* Number of RX queues currently active in device */
	unsigned int		real_num_rx_queues;
1201

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1202
#endif
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1203

1204 1205
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1206

1207
	struct netdev_queue __rcu *ingress_queue;
1208 1209
	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/

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1210 1211 1212 1213

/*
 * Cache lines mostly used on transmit path
 */
1214
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
1215 1216

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
1217
	unsigned int		num_tx_queues;
1218 1219 1220 1221

	/* Number of TX queues currently active in device  */
	unsigned int		real_num_tx_queues;

1222 1223 1224
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
1226
	spinlock_t		tx_global_lock;
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1227

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1228
#ifdef CONFIG_XPS
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1229
	struct xps_dev_maps __rcu *xps_maps;
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1230
#endif
1231 1232 1233 1234 1235 1236
#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
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1237

1238
	/* These may be needed for future network-power-down code. */
1239 1240 1241 1242 1243

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1244 1245 1246 1247 1248
	unsigned long		trans_start;	/* Time (in jiffies) of last Tx	*/

	int			watchdog_timeo; /* used by dev_watchdog() */
	struct timer_list	watchdog_timer;

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	/* Number of references to this device */
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1250
	int __percpu		*pcpu_refcnt;
1251

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1252 1253 1254 1255 1256
	/* delayed register/unregister */
	struct list_head	todo_list;
	/* device index hash chain */
	struct hlist_node	index_hlist;

1257
	struct list_head	link_watch_list;
1258

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1259 1260
	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1261
	       NETREG_REGISTERED,	/* completed register_netdevice */
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1262 1263 1264
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1265
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1266 1267 1268
	} reg_state:8;

	bool dismantle; /* device is going do be freed */
1269 1270 1271 1272 1273

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1275 1276
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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1277 1278

#ifdef CONFIG_NETPOLL
1279
	struct netpoll_info __rcu	*npinfo;
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1280
#endif
1281

1282
#ifdef CONFIG_NET_NS
1283 1284
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1285
#endif
1286

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1287
	/* mid-layer private */
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1288 1289 1290
	union {
		void				*ml_priv;
		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
1291
		struct pcpu_tstats __percpu	*tstats; /* tunnel stats */
1292
		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
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1293
		struct pcpu_vstats __percpu	*vstats; /* veth stats */
E
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1294
	};
1295
	/* GARP */
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1296
	struct garp_port __rcu	*garp_port;
1297 1298
	/* MRP */
	struct mrp_port __rcu	*mrp_port;
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1299 1300

	/* class/net/name entry */
1301
	struct device		dev;
1302 1303
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
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1304 1305 1306

	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
1307

1308 1309 1310
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1311 1312
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1313

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1314
#ifdef CONFIG_DCB
1315
	/* Data Center Bridging netlink ops */
1316
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1317
#endif
1318 1319 1320
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1321

1322
#if IS_ENABLED(CONFIG_FCOE)
1323 1324
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
1325 1326 1327
#endif
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
	struct netprio_map __rcu *priomap;
1328
#endif
1329 1330
	/* phy device may attach itself for hardware timestamping */
	struct phy_device *phydev;
1331

1332 1333
	struct lock_class_key *qdisc_tx_busylock;

1334 1335
	/* group the device belongs to */
	int group;
1336 1337

	struct pm_qos_request	pm_qos_req;
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1338
};
1339
#define to_net_dev(d) container_of(d, struct net_device, dev)
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#define	NETDEV_ALIGN		32

1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
static inline
int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
{
	return dev->prio_tc_map[prio & TC_BITMASK];
}

static inline
int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
{
	if (tc >= dev->num_tc)
		return -EINVAL;

	dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
	return 0;
}

static inline
void netdev_reset_tc(struct net_device *dev)
{
	dev->num_tc = 0;
	memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
	memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
}

static inline
int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
{
	if (tc >= dev->num_tc)
		return -EINVAL;

	dev->tc_to_txq[tc].count = count;
	dev->tc_to_txq[tc].offset = offset;
	return 0;
}

static inline
int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
{
	if (num_tc > TC_MAX_QUEUE)
		return -EINVAL;

	dev->num_tc = num_tc;
	return 0;
}

static inline
int netdev_get_num_tc(struct net_device *dev)
{
	return dev->num_tc;
}

1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
					 unsigned int index)
{
	return &dev->_tx[index];
}

static inline void netdev_for_each_tx_queue(struct net_device *dev,
					    void (*f)(struct net_device *,
						      struct netdev_queue *,
						      void *),
					    void *arg)
{
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++)
		f(dev, &dev->_tx[i], arg);
}

1413 1414
extern struct netdev_queue *netdev_pick_tx(struct net_device *dev,
					   struct sk_buff *skb);
1415
extern u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb);
1416

1417 1418 1419 1420 1421 1422
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
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Eric Dumazet 已提交
1423
	return read_pnet(&dev->nd_net);
1424 1425 1426
}

static inline
1427
void dev_net_set(struct net_device *dev, struct net *net)
1428 1429
{
#ifdef CONFIG_NET_NS
1430 1431
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1432 1433 1434
#endif
}

1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
static inline bool netdev_uses_dsa_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_DSA
	if (dev->dsa_ptr != NULL)
		return dsa_uses_dsa_tags(dev->dsa_ptr);
#endif

	return 0;
}

1445 1446 1447 1448 1449 1450 1451 1452 1453 1454
static inline bool netdev_uses_trailer_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_TRAILER
	if (dev->dsa_ptr != NULL)
		return dsa_uses_trailer_tags(dev->dsa_ptr);
#endif

	return 0;
}

1455 1456 1457 1458 1459 1460
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1461
static inline void *netdev_priv(const struct net_device *dev)
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1462
{
1463
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
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1464 1465 1466 1467 1468
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1469
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1471 1472 1473 1474 1475 1476
/* Set the sysfs device type for the network logical device to allow
 * fin grained indentification of different network device types. For
 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

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1477 1478 1479 1480 1481
/* Default NAPI poll() weight
 * Device drivers are strongly advised to not use bigger value
 */
#define NAPI_POLL_WEIGHT 64

1482 1483 1484 1485 1486 1487 1488 1489 1490 1491
/**
 *	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.
 */
1492 1493
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1494

1495 1496 1497 1498 1499 1500
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1501 1502 1503
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1504 1505 1506
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1507 1508 1509
	/* Length of frag0. */
	unsigned int frag0_len;

1510 1511 1512
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1513 1514 1515 1516
	/* This is non-zero if the packet cannot be merged with the new skb. */
	int flush;

	/* Number of segments aggregated. */
1517 1518 1519 1520
	u16	count;

	/* This is non-zero if the packet may be of the same flow. */
	u8	same_flow;
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Herbert Xu 已提交
1521 1522

	/* Free the skb? */
1523
	u8	free;
1524 1525
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2
1526 1527 1528

	/* jiffies when first packet was created/queued */
	unsigned long age;
1529 1530 1531

	/* Used in ipv6_gro_receive() */
	int	proto;
1532 1533 1534

	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
1535 1536 1537
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1538

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1539
struct packet_type {
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1540 1541 1542 1543 1544 1545
	__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 *);
1546 1547
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
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1548 1549 1550 1551
	void			*af_packet_priv;
	struct list_head	list;
};

1552
struct offload_callbacks {
1553
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
1554
						netdev_features_t features);
1555
	int			(*gso_send_check)(struct sk_buff *skb);
1556 1557 1558
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
1559 1560 1561 1562 1563 1564
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
	struct offload_callbacks callbacks;
	struct list_head	 list;
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1565 1566 1567 1568
};

#include <linux/notifier.h>

1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
/* netdevice notifier chain. Please remember to update the rtnetlink
 * notification exclusion list in rtnetlink_event() when adding new
 * types.
 */
#define NETDEV_UP	0x0001	/* For now you can't veto a device up/down */
#define NETDEV_DOWN	0x0002
#define NETDEV_REBOOT	0x0003	/* Tell a protocol stack a network interface
				   detected a hardware crash and restarted
				   - we can use this eg to kick tcp sessions
				   once done */
#define NETDEV_CHANGE	0x0004	/* Notify device state change */
#define NETDEV_REGISTER 0x0005
#define NETDEV_UNREGISTER	0x0006
#define NETDEV_CHANGEMTU	0x0007
#define NETDEV_CHANGEADDR	0x0008
#define NETDEV_GOING_DOWN	0x0009
#define NETDEV_CHANGENAME	0x000A
#define NETDEV_FEAT_CHANGE	0x000B
#define NETDEV_BONDING_FAILOVER 0x000C
#define NETDEV_PRE_UP		0x000D
#define NETDEV_PRE_TYPE_CHANGE	0x000E
#define NETDEV_POST_TYPE_CHANGE	0x000F
#define NETDEV_POST_INIT	0x0010
1592
#define NETDEV_UNREGISTER_FINAL 0x0011
1593 1594 1595
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014
1596
#define NETDEV_CHANGEUPPER	0x0015
1597 1598 1599 1600 1601 1602

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);


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1603 1604
extern rwlock_t				dev_base_lock;		/* Device list lock */

1605
extern seqcount_t	devnet_rename_seq;	/* Device rename seq */
1606

1607

1608 1609
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1610 1611
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1612 1613
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1614 1615 1616 1617
#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)
1618 1619
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1620 1621 1622
#define for_each_netdev_in_bond_rcu(bond, slave)	\
		for_each_netdev_rcu(&init_net, slave)	\
			if (netdev_master_upper_dev_get_rcu(slave) == bond)
1623
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1624

1625 1626 1627 1628 1629
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1630
	net = dev_net(dev);
1631 1632 1633 1634
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1635 1636 1637 1638 1639 1640
static inline struct net_device *next_net_device_rcu(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

	net = dev_net(dev);
E
Eric Dumazet 已提交
1641
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1642 1643 1644
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1645 1646 1647 1648 1649
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);
}
1650

E
Eric Dumazet 已提交
1651 1652 1653 1654 1655 1656 1657
static inline struct net_device *first_net_device_rcu(struct net *net)
{
	struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));

	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

L
Linus Torvalds 已提交
1658 1659
extern int 			netdev_boot_setup_check(struct net_device *dev);
extern unsigned long		netdev_boot_base(const char *prefix, int unit);
1660 1661
extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
					      const char *hwaddr);
1662 1663
extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
L
Linus Torvalds 已提交
1664 1665 1666
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);
1667 1668 1669
extern void		dev_add_offload(struct packet_offload *po);
extern void		dev_remove_offload(struct packet_offload *po);
extern void		__dev_remove_offload(struct packet_offload *po);
L
Linus Torvalds 已提交
1670

E
Eric Dumazet 已提交
1671 1672
extern struct net_device	*dev_get_by_flags_rcu(struct net *net, unsigned short flags,
						      unsigned short mask);
1673
extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
1674
extern struct net_device	*dev_get_by_name_rcu(struct net *net, const char *name);
1675
extern struct net_device	*__dev_get_by_name(struct net *net, const char *name);
L
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1676 1677 1678
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);
1679
extern void		dev_disable_lro(struct net_device *dev);
1680
extern int		dev_loopback_xmit(struct sk_buff *newskb);
L
Linus Torvalds 已提交
1681 1682
extern int		dev_queue_xmit(struct sk_buff *skb);
extern int		register_netdevice(struct net_device *dev);
1683 1684
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1685
extern void		unregister_netdevice_many(struct list_head *head);
1686 1687 1688 1689 1690
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

E
Eric Dumazet 已提交
1691
extern int 		netdev_refcnt_read(const struct net_device *dev);
L
Linus Torvalds 已提交
1692 1693
extern void		free_netdev(struct net_device *dev);
extern void		synchronize_net(void);
1694 1695
extern int		init_dummy_netdev(struct net_device *dev);

1696 1697
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);
1698
extern struct net_device	*dev_get_by_index_rcu(struct net *net, int ifindex);
L
Linus Torvalds 已提交
1699 1700 1701 1702
extern int		dev_restart(struct net_device *dev);
#ifdef CONFIG_NETPOLL_TRAP
extern int		netpoll_trap(void);
#endif
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720
extern int	       skb_gro_receive(struct sk_buff **head,
				       struct sk_buff *skb);

static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
{
	return NAPI_GRO_CB(skb)->data_offset;
}

static inline unsigned int skb_gro_len(const struct sk_buff *skb)
{
	return skb->len - NAPI_GRO_CB(skb)->data_offset;
}

static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
{
	NAPI_GRO_CB(skb)->data_offset += len;
}

1721 1722
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1723
{
1724 1725
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1726

1727 1728 1729 1730
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1731

1732 1733 1734
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
1735 1736 1737
	if (!pskb_may_pull(skb, hlen))
		return NULL;

1738 1739
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
1740
	return skb->data + offset;
1741
}
L
Linus Torvalds 已提交
1742

1743 1744
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1745
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1746 1747
}

H
Herbert Xu 已提交
1748 1749
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1750 1751
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
1752 1753
}

1754 1755
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1756
				  const void *daddr, const void *saddr,
1757
				  unsigned int len)
1758
{
1759
	if (!dev->header_ops || !dev->header_ops->create)
1760
		return 0;
1761 1762

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1763 1764
}

S
Stephen Hemminger 已提交
1765 1766 1767 1768 1769
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1770
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
1771
		return 0;
1772
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
1773 1774
}

L
Linus Torvalds 已提交
1775 1776 1777 1778 1779 1780 1781
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);
}

1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794
#ifdef CONFIG_NET_FLOW_LIMIT
#define FLOW_LIMIT_HISTORY	(1 << 8)	/* must be ^2 */
struct sd_flow_limit {
	u64			count;
	unsigned int		num_buckets;
	unsigned int		history_head;
	u16			history[FLOW_LIMIT_HISTORY];
	u8			buckets[];
};

extern int netdev_flow_limit_table_len;
#endif /* CONFIG_NET_FLOW_LIMIT */

L
Linus Torvalds 已提交
1795
/*
E
Eric Dumazet 已提交
1796
 * Incoming packets are placed on per-cpu queues
L
Linus Torvalds 已提交
1797
 */
E
Eric Dumazet 已提交
1798
struct softnet_data {
1799
	struct Qdisc		*output_queue;
1800
	struct Qdisc		**output_queue_tailp;
L
Linus Torvalds 已提交
1801 1802
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
1803
	struct sk_buff_head	process_queue;
L
Linus Torvalds 已提交
1804

C
Changli Gao 已提交
1805
	/* stats */
1806 1807 1808 1809
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
C
Changli Gao 已提交
1810

1811
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
1812 1813 1814
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
T
Tom Herbert 已提交
1815
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
1816 1817
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
Tom Herbert 已提交
1818
	unsigned int		input_queue_head;
1819
	unsigned int		input_queue_tail;
1820
#endif
1821
	unsigned int		dropped;
T
Tom Herbert 已提交
1822
	struct sk_buff_head	input_pkt_queue;
1823
	struct napi_struct	backlog;
1824 1825 1826 1827

#ifdef CONFIG_NET_FLOW_LIMIT
	struct sd_flow_limit	*flow_limit;
#endif
L
Linus Torvalds 已提交
1828 1829
};

1830
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
1831 1832
{
#ifdef CONFIG_RPS
1833 1834 1835 1836 1837 1838 1839 1840 1841
	sd->input_queue_head++;
#endif
}

static inline void input_queue_tail_incr_save(struct softnet_data *sd,
					      unsigned int *qtail)
{
#ifdef CONFIG_RPS
	*qtail = ++sd->input_queue_tail;
T
Tom Herbert 已提交
1842 1843 1844
#endif
}

T
Tom Herbert 已提交
1845
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
1846

1847
extern void __netif_schedule(struct Qdisc *q);
L
Linus Torvalds 已提交
1848

1849
static inline void netif_schedule_queue(struct netdev_queue *txq)
L
Linus Torvalds 已提交
1850
{
1851
	if (!(txq->state & QUEUE_STATE_ANY_XOFF))
1852
		__netif_schedule(txq->qdisc);
1853 1854
}

1855 1856 1857 1858 1859 1860 1861 1862
static inline void netif_tx_schedule_all(struct net_device *dev)
{
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++)
		netif_schedule_queue(netdev_get_tx_queue(dev, i));
}

1863 1864
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
1865
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1866 1867
}

1868 1869 1870 1871 1872 1873
/**
 *	netif_start_queue - allow transmit
 *	@dev: network device
 *
 *	Allow upper layers to call the device hard_start_xmit routine.
 */
L
Linus Torvalds 已提交
1874 1875
static inline void netif_start_queue(struct net_device *dev)
{
1876
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1877 1878
}

1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
static inline void netif_tx_start_all_queues(struct net_device *dev)
{
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		netif_tx_start_queue(txq);
	}
}

1889
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
L
Linus Torvalds 已提交
1890 1891
{
#ifdef CONFIG_NETPOLL_TRAP
1892
	if (netpoll_trap()) {
1893
		netif_tx_start_queue(dev_queue);
L
Linus Torvalds 已提交
1894
		return;
1895
	}
L
Linus Torvalds 已提交
1896
#endif
1897
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
1898
		__netif_schedule(dev_queue->qdisc);
1899 1900
}

1901 1902 1903 1904 1905 1906 1907
/**
 *	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.
 */
1908 1909
static inline void netif_wake_queue(struct net_device *dev)
{
1910
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1911 1912
}

1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
static inline void netif_tx_wake_all_queues(struct net_device *dev)
{
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		netif_tx_wake_queue(txq);
	}
}

1923 1924
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
1925
	if (WARN_ON(!dev_queue)) {
1926
		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1927 1928
		return;
	}
1929
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1930 1931
}

1932 1933 1934 1935 1936 1937 1938
/**
 *	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.
 */
L
Linus Torvalds 已提交
1939 1940
static inline void netif_stop_queue(struct net_device *dev)
{
1941
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1942 1943
}

1944 1945 1946 1947 1948 1949 1950 1951 1952 1953
static inline void netif_tx_stop_all_queues(struct net_device *dev)
{
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		netif_tx_stop_queue(txq);
	}
}

1954
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1955
{
1956
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1957 1958
}

1959 1960 1961 1962 1963 1964
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
1965
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
1966
{
1967
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1968 1969
}

1970
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
1971
{
1972 1973 1974
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

1975
static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
1976 1977 1978 1979
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

1980 1981 1982
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
1983 1984
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000

	if (likely(dql_avail(&dev_queue->dql) >= 0))
		return;

	set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);

	/*
	 * The XOFF flag must be set before checking the dql_avail below,
	 * because in netdev_tx_completed_queue we update the dql_completed
	 * before checking the XOFF flag.
	 */
	smp_mb();

	/* check again in case another CPU has just made room avail */
	if (unlikely(dql_avail(&dev_queue->dql) >= 0))
		clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
T
Tom Herbert 已提交
2001
#endif
2002 2003 2004 2005 2006 2007 2008 2009
}

static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
{
	netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
}

static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
2010
					     unsigned int pkts, unsigned int bytes)
2011
{
T
Tom Herbert 已提交
2012
#ifdef CONFIG_BQL
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
	if (unlikely(!bytes))
		return;

	dql_completed(&dev_queue->dql, bytes);

	/*
	 * Without the memory barrier there is a small possiblity that
	 * netdev_tx_sent_queue will miss the update and cause the queue to
	 * be stopped forever
	 */
	smp_mb();

	if (dql_avail(&dev_queue->dql) < 0)
		return;

	if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
		netif_schedule_queue(dev_queue);
T
Tom Herbert 已提交
2030
#endif
2031 2032 2033
}

static inline void netdev_completed_queue(struct net_device *dev,
2034
					  unsigned int pkts, unsigned int bytes)
2035 2036 2037 2038 2039 2040
{
	netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
}

static inline void netdev_tx_reset_queue(struct netdev_queue *q)
{
T
Tom Herbert 已提交
2041
#ifdef CONFIG_BQL
2042
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
2043 2044
	dql_reset(&q->dql);
#endif
2045 2046 2047 2048 2049
}

static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2050 2051
}

2052 2053 2054 2055 2056 2057
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
2058
static inline bool netif_running(const struct net_device *dev)
L
Linus Torvalds 已提交
2059 2060 2061 2062
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

2063 2064 2065 2066 2067 2068
/*
 * 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.
 */
2069 2070 2071 2072 2073 2074 2075 2076

/**
 *	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.
 */
2077 2078
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
2079
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2080 2081

	netif_tx_start_queue(txq);
2082 2083
}

2084 2085 2086 2087 2088 2089 2090
/**
 *	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.
 */
2091 2092
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
2093
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2094 2095 2096 2097
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2098
	netif_tx_stop_queue(txq);
2099 2100
}

2101 2102 2103 2104 2105 2106 2107
/**
 *	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.
 */
2108 2109
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
2110
{
2111
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2112 2113

	return netif_tx_queue_stopped(txq);
2114 2115
}

2116 2117
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
2118 2119 2120
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
2121 2122 2123 2124 2125 2126 2127 2128

/**
 *	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.
 */
2129 2130
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
2131
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2132 2133 2134 2135
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2136
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2137
		__netif_schedule(txq->qdisc);
2138 2139
}

2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151
#ifdef CONFIG_XPS
extern int netif_set_xps_queue(struct net_device *dev, struct cpumask *mask,
			       u16 index);
#else
static inline int netif_set_xps_queue(struct net_device *dev,
				      struct cpumask *mask,
				      u16 index)
{
	return 0;
}
#endif

2152 2153 2154 2155 2156 2157 2158 2159 2160 2161
/*
 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
 * as a distribution range limit for the returned value.
 */
static inline u16 skb_tx_hash(const struct net_device *dev,
			      const struct sk_buff *skb)
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

2162 2163 2164 2165 2166 2167
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
2168
static inline bool netif_is_multiqueue(const struct net_device *dev)
2169
{
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2170
	return dev->num_tx_queues > 1;
2171
}
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2172

2173 2174
extern int netif_set_real_num_tx_queues(struct net_device *dev,
					unsigned int txq);
2175

2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186
#ifdef CONFIG_RPS
extern int netif_set_real_num_rx_queues(struct net_device *dev,
					unsigned int rxq);
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

2187 2188 2189
static inline int netif_copy_real_num_queues(struct net_device *to_dev,
					     const struct net_device *from_dev)
{
2190 2191 2192 2193 2194 2195
	int err;

	err = netif_set_real_num_tx_queues(to_dev,
					   from_dev->real_num_tx_queues);
	if (err)
		return err;
2196 2197 2198 2199 2200 2201 2202 2203
#ifdef CONFIG_RPS
	return netif_set_real_num_rx_queues(to_dev,
					    from_dev->real_num_rx_queues);
#else
	return 0;
#endif
}

2204 2205 2206
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
extern int netif_get_num_default_rss_queues(void);

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2207
/* Use this variant when it is known for sure that it
2208 2209
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
L
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2210
 */
2211
extern void dev_kfree_skb_irq(struct sk_buff *skb);
L
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2212 2213

/* Use this variant in places where it could be invoked
2214 2215
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
L
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2216
 */
2217
extern void dev_kfree_skb_any(struct sk_buff *skb);
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2218 2219 2220 2221

extern int		netif_rx(struct sk_buff *skb);
extern int		netif_rx_ni(struct sk_buff *skb);
extern int		netif_receive_skb(struct sk_buff *skb);
2222
extern gro_result_t	napi_gro_receive(struct napi_struct *napi,
2223
					 struct sk_buff *skb);
2224
extern void		napi_gro_flush(struct napi_struct *napi, bool flush_old);
2225
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
2226
extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
2227 2228 2229 2230 2231 2232 2233

static inline void napi_free_frags(struct napi_struct *napi)
{
	kfree_skb(napi->skb);
	napi->skb = NULL;
}

2234
extern int netdev_rx_handler_register(struct net_device *dev,
J
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2235 2236
				      rx_handler_func_t *rx_handler,
				      void *rx_handler_data);
2237 2238
extern void netdev_rx_handler_unregister(struct net_device *dev);

2239
extern bool		dev_valid_name(const char *name);
2240 2241
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
2242
extern unsigned int	dev_get_flags(const struct net_device *);
2243
extern int		__dev_change_flags(struct net_device *, unsigned int flags);
2244
extern int		dev_change_flags(struct net_device *, unsigned int);
2245
extern void		__dev_notify_flags(struct net_device *, unsigned int old_flags);
2246
extern int		dev_change_name(struct net_device *, const char *);
2247
extern int		dev_set_alias(struct net_device *, const char *, size_t);
2248 2249
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
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2250
extern int		dev_set_mtu(struct net_device *, int);
2251
extern void		dev_set_group(struct net_device *, int);
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2252 2253
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
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2254 2255
extern int		dev_change_carrier(struct net_device *,
					   bool new_carrier);
2256
extern int		dev_hard_start_xmit(struct sk_buff *skb,
2257 2258
					    struct net_device *dev,
					    struct netdev_queue *txq);
2259 2260
extern int		dev_forward_skb(struct net_device *dev,
					struct sk_buff *skb);
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2261

2262
extern int		netdev_budget;
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2263 2264 2265 2266

/* Called by rtnetlink.c:rtnl_unlock() */
extern void netdev_run_todo(void);

2267 2268 2269 2270
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
2271
 * Release reference to device to allow it to be freed.
2272
 */
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2273 2274
static inline void dev_put(struct net_device *dev)
{
2275
	this_cpu_dec(*dev->pcpu_refcnt);
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2276 2277
}

2278 2279 2280 2281
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
2282
 * Hold reference to device to keep it from being freed.
2283
 */
2284 2285
static inline void dev_hold(struct net_device *dev)
{
2286
	this_cpu_inc(*dev->pcpu_refcnt);
2287
}
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2288 2289 2290 2291

/* 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.
S
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2292 2293 2294 2295
 *
 * 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.
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2296 2297
 */

2298
extern void linkwatch_init_dev(struct net_device *dev);
L
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2299
extern void linkwatch_fire_event(struct net_device *dev);
2300
extern void linkwatch_forget_dev(struct net_device *dev);
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2301

2302 2303 2304 2305 2306 2307
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2308
static inline bool netif_carrier_ok(const struct net_device *dev)
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2309 2310 2311 2312
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

2313 2314
extern unsigned long dev_trans_start(struct net_device *dev);

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2315 2316
extern void __netdev_watchdog_up(struct net_device *dev);

2317
extern void netif_carrier_on(struct net_device *dev);
L
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2318

2319
extern void netif_carrier_off(struct net_device *dev);
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2320

2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333
/**
 *	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.
 *
 */
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Stefan Rompf 已提交
2334 2335 2336 2337 2338 2339
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2340 2341 2342 2343 2344 2345
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
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2346 2347 2348 2349 2350 2351
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2352 2353 2354 2355 2356 2357
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2358
static inline bool netif_dormant(const struct net_device *dev)
S
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2359 2360 2361 2362 2363
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2364 2365 2366 2367 2368 2369
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
2370
static inline bool netif_oper_up(const struct net_device *dev)
E
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2371
{
S
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2372 2373 2374 2375
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

2376 2377 2378 2379 2380 2381
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
2382
static inline bool netif_device_present(struct net_device *dev)
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2383 2384 2385 2386
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

2387
extern void netif_device_detach(struct net_device *dev);
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2388

2389
extern void netif_device_attach(struct net_device *dev);
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2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439

/*
 * Network interface message level settings
 */

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;
}

2440
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
2441
{
2442 2443
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
2444 2445
}

2446 2447 2448 2449 2450 2451
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

2452
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2453
{
2454
	bool ok = spin_trylock(&txq->_xmit_lock);
2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471
	if (likely(ok))
		txq->xmit_lock_owner = smp_processor_id();
	return ok;
}

static inline void __netif_tx_unlock(struct netdev_queue *txq)
{
	txq->xmit_lock_owner = -1;
	spin_unlock(&txq->_xmit_lock);
}

static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
{
	txq->xmit_lock_owner = -1;
	spin_unlock_bh(&txq->_xmit_lock);
}

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2472 2473 2474 2475 2476 2477
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

2478 2479 2480 2481 2482 2483
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
2484 2485
static inline void netif_tx_lock(struct net_device *dev)
{
2486
	unsigned int i;
2487
	int cpu;
2488

2489 2490
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
2491 2492
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2493 2494 2495 2496 2497 2498 2499

		/* We are the only thread of execution doing a
		 * freeze, but we have to grab the _xmit_lock in
		 * order to synchronize with threads which are in
		 * the ->hard_start_xmit() handler and already
		 * checked the frozen bit.
		 */
2500
		__netif_tx_lock(txq, cpu);
2501 2502
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
2503
	}
H
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2504 2505 2506 2507
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
2508 2509
	local_bh_disable();
	netif_tx_lock(dev);
H
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2510 2511 2512 2513
}

static inline void netif_tx_unlock(struct net_device *dev)
{
2514 2515 2516 2517
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2518

2519 2520 2521 2522 2523
		/* No need to grab the _xmit_lock here.  If the
		 * queue is not stopped for another reason, we
		 * force a schedule.
		 */
		clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
2524
		netif_schedule_queue(txq);
2525 2526
	}
	spin_unlock(&dev->tx_global_lock);
H
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2527 2528 2529 2530
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2531 2532
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
2533 2534
}

2535
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2536
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2537
		__netif_tx_lock(txq, cpu);		\
2538 2539 2540
	}						\
}

2541
#define HARD_TX_UNLOCK(dev, txq) {			\
2542
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2543
		__netif_tx_unlock(txq);			\
2544 2545 2546
	}						\
}

L
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2547 2548
static inline void netif_tx_disable(struct net_device *dev)
{
2549
	unsigned int i;
2550
	int cpu;
2551

2552 2553
	local_bh_disable();
	cpu = smp_processor_id();
2554 2555
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2556 2557

		__netif_tx_lock(txq, cpu);
2558
		netif_tx_stop_queue(txq);
2559
		__netif_tx_unlock(txq);
2560
	}
2561
	local_bh_enable();
L
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2562 2563
}

2564 2565 2566 2567 2568
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

2569 2570 2571 2572 2573
static inline void netif_addr_lock_nested(struct net_device *dev)
{
	spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
}

2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588
static inline void netif_addr_lock_bh(struct net_device *dev)
{
	spin_lock_bh(&dev->addr_list_lock);
}

static inline void netif_addr_unlock(struct net_device *dev)
{
	spin_unlock(&dev->addr_list_lock);
}

static inline void netif_addr_unlock_bh(struct net_device *dev)
{
	spin_unlock_bh(&dev->addr_list_lock);
}

2589
/*
2590
 * dev_addrs walker. Should be used only for read access. Call with
2591 2592 2593
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2594
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2595

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2596 2597 2598 2599 2600
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

extern void		ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
T
Tom Herbert 已提交
2601
extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2602
				       void (*setup)(struct net_device *),
T
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2603
				       unsigned int txqs, unsigned int rxqs);
2604
#define alloc_netdev(sizeof_priv, name, setup) \
T
Tom Herbert 已提交
2605 2606 2607 2608 2609
	alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)

#define alloc_netdev_mq(sizeof_priv, name, setup, count) \
	alloc_netdev_mqs(sizeof_priv, name, setup, count, count)

L
Linus Torvalds 已提交
2610 2611
extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
2612

2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628
/* General hardware address lists handling functions */
extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
				  struct netdev_hw_addr_list *from_list,
				  int addr_len, unsigned char addr_type);
extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
				   struct netdev_hw_addr_list *from_list,
				   int addr_len, unsigned char addr_type);
extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
			  struct netdev_hw_addr_list *from_list,
			  int addr_len);
extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
			     struct netdev_hw_addr_list *from_list,
			     int addr_len);
extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
extern void __hw_addr_init(struct netdev_hw_addr_list *list);

2629
/* Functions used for device addresses handling */
2630
extern int dev_addr_add(struct net_device *dev, const unsigned char *addr,
2631
			unsigned char addr_type);
2632
extern int dev_addr_del(struct net_device *dev, const unsigned char *addr,
2633 2634 2635 2636 2637 2638 2639
			unsigned char addr_type);
extern int dev_addr_add_multiple(struct net_device *to_dev,
				 struct net_device *from_dev,
				 unsigned char addr_type);
extern int dev_addr_del_multiple(struct net_device *to_dev,
				 struct net_device *from_dev,
				 unsigned char addr_type);
2640 2641 2642 2643
extern void dev_addr_flush(struct net_device *dev);
extern int dev_addr_init(struct net_device *dev);

/* Functions used for unicast addresses handling */
2644 2645 2646
extern int dev_uc_add(struct net_device *dev, const unsigned char *addr);
extern int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
extern int dev_uc_del(struct net_device *dev, const unsigned char *addr);
2647
extern int dev_uc_sync(struct net_device *to, struct net_device *from);
2648
extern int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
2649 2650 2651
extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
extern void dev_uc_flush(struct net_device *dev);
extern void dev_uc_init(struct net_device *dev);
2652

2653
/* Functions used for multicast addresses handling */
2654 2655 2656 2657 2658
extern int dev_mc_add(struct net_device *dev, const unsigned char *addr);
extern int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
extern int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
extern int dev_mc_del(struct net_device *dev, const unsigned char *addr);
extern int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
2659
extern int dev_mc_sync(struct net_device *to, struct net_device *from);
2660
extern int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
2661 2662 2663
extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
extern void dev_mc_flush(struct net_device *dev);
extern void dev_mc_init(struct net_device *dev);
2664

2665 2666 2667
/* 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);
2668 2669
extern int		dev_set_promiscuity(struct net_device *dev, int inc);
extern int		dev_set_allmulti(struct net_device *dev, int inc);
L
Linus Torvalds 已提交
2670
extern void		netdev_state_change(struct net_device *dev);
2671
extern void		netdev_notify_peers(struct net_device *dev);
2672
extern void		netdev_features_change(struct net_device *dev);
L
Linus Torvalds 已提交
2673
/* Load a device via the kmod */
2674
extern void		dev_load(struct net *net, const char *name);
2675 2676
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					       struct rtnl_link_stats64 *storage);
2677 2678
extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
				    const struct net_device_stats *netdev_stats);
2679

L
Linus Torvalds 已提交
2680
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
2681
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
2682
extern int		weight_p;
2683
extern int		bpf_jit_enable;
J
Jiri Pirko 已提交
2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695

extern bool netdev_has_upper_dev(struct net_device *dev,
				 struct net_device *upper_dev);
extern bool netdev_has_any_upper_dev(struct net_device *dev);
extern struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
extern struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
extern int netdev_upper_dev_link(struct net_device *dev,
				 struct net_device *upper_dev);
extern int netdev_master_upper_dev_link(struct net_device *dev,
					struct net_device *upper_dev);
extern void netdev_upper_dev_unlink(struct net_device *dev,
				    struct net_device *upper_dev);
2696
extern int skb_checksum_help(struct sk_buff *skb);
2697 2698
extern struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
	netdev_features_t features, bool tx_path);
2699 2700
extern struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
					  netdev_features_t features);
2701 2702 2703 2704 2705 2706

static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
	return __skb_gso_segment(skb, features, true);
}
2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719
__be16 skb_network_protocol(struct sk_buff *skb);

static inline bool can_checksum_protocol(netdev_features_t features,
					 __be16 protocol)
{
	return ((features & NETIF_F_GEN_CSUM) ||
		((features & NETIF_F_V4_CSUM) &&
		 protocol == htons(ETH_P_IP)) ||
		((features & NETIF_F_V6_CSUM) &&
		 protocol == htons(ETH_P_IPV6)) ||
		((features & NETIF_F_FCOE_CRC) &&
		 protocol == htons(ETH_P_FCOE)));
}
2720

2721 2722 2723 2724 2725 2726 2727
#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
L
Linus Torvalds 已提交
2728 2729 2730 2731
/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

2732
#ifdef CONFIG_PROC_FS
2733 2734 2735
extern int __init dev_proc_init(void);
#else
#define dev_proc_init() 0
2736 2737
#endif

2738 2739 2740
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

2741 2742
extern struct kobj_ns_type_operations net_ns_type_operations;

2743
extern const char *netdev_drivername(const struct net_device *dev);
2744

2745 2746
extern void linkwatch_run_queue(void);

2747 2748
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
2749 2750 2751
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
2752 2753
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764

/* Allow TSO being used on stacked device :
 * Performing the GSO segmentation before last device
 * is a performance improvement.
 */
static inline netdev_features_t netdev_add_tso_features(netdev_features_t features,
							netdev_features_t mask)
{
	return netdev_increment_features(features, NETIF_F_ALL_TSO, mask);
}

2765
int __netdev_update_features(struct net_device *dev);
2766
void netdev_update_features(struct net_device *dev);
2767
void netdev_change_features(struct net_device *dev);
2768

2769 2770 2771
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

2772
netdev_features_t netif_skb_features(struct sk_buff *skb);
2773

2774
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
2775
{
2776
	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
2777 2778 2779 2780 2781 2782 2783 2784 2785

	/* check flags correspondence */
	BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));

2786
	return (features & feature) == feature;
2787 2788
}

2789
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
2790
{
H
Herbert Xu 已提交
2791
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2792
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2793 2794
}

2795 2796
static inline bool netif_needs_gso(struct sk_buff *skb,
				   netdev_features_t features)
2797
{
2798
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2799 2800
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
2801 2802
}

2803 2804 2805 2806 2807 2808
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

2809 2810 2811 2812 2813
static inline bool netif_is_bond_master(struct net_device *dev)
{
	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
}

2814
static inline bool netif_is_bond_slave(struct net_device *dev)
J
Jiri Pirko 已提交
2815 2816 2817 2818
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

2819 2820 2821 2822 2823
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

2824
extern struct pernet_operations __net_initdata loopback_net_ops;
2825

2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

static inline const char *netdev_name(const struct net_device *dev)
{
	if (dev->reg_state != NETREG_REGISTERED)
		return "(unregistered net_device)";
	return dev->name;
}

2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853
extern __printf(3, 4)
int netdev_printk(const char *level, const struct net_device *dev,
		  const char *format, ...);
extern __printf(2, 3)
int netdev_emerg(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_alert(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_crit(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_err(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_warn(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_notice(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_info(const struct net_device *dev, const char *format, ...);
2854

2855 2856 2857
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

2858
#if defined(CONFIG_DYNAMIC_DEBUG)
2859 2860
#define netdev_dbg(__dev, format, args...)			\
do {								\
2861
	dynamic_netdev_dbg(__dev, format, ##args);		\
2862
} while (0)
2863 2864 2865
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894
#else
#define netdev_dbg(__dev, format, args...)			\
({								\
	if (0)							\
		netdev_printk(KERN_DEBUG, __dev, format, ##args); \
	0;							\
})
#endif

#if defined(VERBOSE_DEBUG)
#define netdev_vdbg	netdev_dbg
#else

#define netdev_vdbg(dev, format, args...)			\
({								\
	if (0)							\
		netdev_printk(KERN_DEBUG, dev, format, ##args);	\
	0;							\
})
#endif

/*
 * netdev_WARN() acts like dev_printk(), but with the key difference
 * of using a WARN/WARN_ON to get the message out, including the
 * file/line information and a backtrace.
 */
#define netdev_WARN(dev, format, args...)			\
	WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);

2895 2896 2897 2898 2899 2900 2901 2902
/* netif printk helpers, similar to netdev_printk */

#define netif_printk(priv, type, level, dev, fmt, args...)	\
do {					  			\
	if (netif_msg_##type(priv))				\
		netdev_printk(level, (dev), fmt, ##args);	\
} while (0)

2903 2904 2905 2906 2907 2908
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

2909
#define netif_emerg(priv, type, dev, fmt, args...)		\
2910
	netif_level(emerg, priv, type, dev, fmt, ##args)
2911
#define netif_alert(priv, type, dev, fmt, args...)		\
2912
	netif_level(alert, priv, type, dev, fmt, ##args)
2913
#define netif_crit(priv, type, dev, fmt, args...)		\
2914
	netif_level(crit, priv, type, dev, fmt, ##args)
2915
#define netif_err(priv, type, dev, fmt, args...)		\
2916
	netif_level(err, priv, type, dev, fmt, ##args)
2917
#define netif_warn(priv, type, dev, fmt, args...)		\
2918
	netif_level(warn, priv, type, dev, fmt, ##args)
2919
#define netif_notice(priv, type, dev, fmt, args...)		\
2920
	netif_level(notice, priv, type, dev, fmt, ##args)
2921
#define netif_info(priv, type, dev, fmt, args...)		\
2922
	netif_level(info, priv, type, dev, fmt, ##args)
2923

2924
#if defined(CONFIG_DYNAMIC_DEBUG)
2925 2926 2927
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
2928
		dynamic_netdev_dbg(netdev, format, ##args);	\
2929
} while (0)
2930 2931 2932
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2933 2934 2935 2936 2937 2938 2939 2940 2941 2942
#else
#define netif_dbg(priv, type, dev, format, args...)			\
({									\
	if (0)								\
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
	0;								\
})
#endif

#if defined(VERBOSE_DEBUG)
2943
#define netif_vdbg	netif_dbg
2944 2945 2946 2947
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
2948
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2949 2950 2951
	0;							\
})
#endif
2952

2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982
/*
 *	The list of packet types we will receive (as opposed to discard)
 *	and the routines to invoke.
 *
 *	Why 16. Because with 16 the only overlap we get on a hash of the
 *	low nibble of the protocol value is RARP/SNAP/X.25.
 *
 *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
 *             sure which should go first, but I bet it won't make much
 *             difference if we are running VLANs.  The good news is that
 *             this protocol won't be in the list unless compiled in, so
 *             the average user (w/out VLANs) will not be adversely affected.
 *             --BLG
 *
 *		0800	IP
 *		8100    802.1Q VLAN
 *		0001	802.3
 *		0002	AX.25
 *		0004	802.2
 *		8035	RARP
 *		0005	SNAP
 *		0805	X.25
 *		0806	ARP
 *		8137	IPX
 *		0009	Localtalk
 *		86DD	IPv6
 */
#define PTYPE_HASH_SIZE	(16)
#define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)

2983
#endif	/* _LINUX_NETDEVICE_H */