netdevice.h 86.1 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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/* 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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/* 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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#elif IS_ENABLED(CONFIG_TR)
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# define LL_MAX_HEADER 48
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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
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	bool			synced;
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	bool			global_use;
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	int			refcount;
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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 work_struct free_work;
	struct rps_dev_flow flows[0];
};
#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
596
    ((_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) + \
607
    ((_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];
};
659
#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.
701 702
 * 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);
724
 *	Called when a packet needs to be transmitted.
725 726
 *	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.
739 740
 *	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
744
 *	needs to be changed. If this interface is not defined, the
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764
 *	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.
 *
765
 * 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.
 *
769
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
770
 *                      struct rtnl_link_stats64 *storage);
771
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
772
 *	Called when a user wants to get the network device usage
773
 *	statistics. Drivers must do one of the following:
774 775
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
776
 *	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.
782
 *
783
 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
784 785 786
 *	If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *	this function is called when a VLAN id is registered.
 *
787
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
788 789 790 791
 *	If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *	this function is called when a VLAN id is unregistered.
 *
 * 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);
797
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
798 799
 * 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.
808
 *
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
 *	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.
 *
839 840 841 842 843 844 845
 * 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.
 *
846 847 848 849 850 851
 * 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.
 *
852 853 854 855 856 857
 *	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.
858 859 860 861 862 863 864 865
 *
 *	Slave management functions (for bridge, bonding, etc). User should
 *	call netdev_set_master() to set dev->master properly.
 * 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.
866 867
 *
 *      Feature/offload setting functions.
868 869
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *		netdev_features_t features);
870 871 872 873
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
874
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
875 876 877 878
 *	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.
 *
879 880
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
881
 *		      const unsigned char *addr, u16 flags)
882 883
 *	Adds an FDB entry to dev for addr.
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct net_device *dev,
884
 *		      const unsigned char *addr)
885 886 887 888 889
 *	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,
 *			     struct net_device *dev)
894 895 896 897 898 899
 */
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);
900
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
901 902 903
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
904 905 906 907 908 909 910 911 912 913
	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);
914 915 916 917
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
918 919
	void			(*ndo_tx_timeout) (struct net_device *dev);

920 921
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
922 923
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

924
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
925
						       unsigned short vid);
926
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
927 928 929
						        unsigned short vid);
#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,
931 932
						     struct netpoll_info *info,
						     gfp_t gfp);
933
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
934
#endif
935 936 937 938 939 940
	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);
941 942
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
943 944 945
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
946 947 948 949 950
	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);
951
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
952
#if IS_ENABLED(CONFIG_FCOE)
953 954
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
955 956 957 958 959 960
	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);
961 962 963 964
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
965 966
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
967 968
#endif

969
#if IS_ENABLED(CONFIG_LIBFCOE)
970 971 972 973
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
974
#endif
975

976 977 978 979 980 981
#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
982 983 984 985
	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);
986 987
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
988
	int			(*ndo_set_features)(struct net_device *dev,
989
						    netdev_features_t features);
990
	int			(*ndo_neigh_construct)(struct neighbour *n);
991
	void			(*ndo_neigh_destroy)(struct neighbour *n);
992 993

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
994
					       struct nlattr *tb[],
995
					       struct net_device *dev,
996
					       const unsigned char *addr,
997 998 999
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
					       struct net_device *dev,
1000
					       const unsigned char *addr);
1001 1002 1003 1004
	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,
						      struct net_device *dev);
1011 1012
};

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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
1028
	 * of the interface.
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	 */
	char			name[IFNAMSIZ];
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1032
	/* device name hash chain, please keep it close to name[] */
1033
	struct hlist_node	name_hlist;
1034

1035 1036
	/* 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;

1054
	struct list_head	dev_list;
1055
	struct list_head	napi_list;
1056
	struct list_head	unreg_list;
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1058
	/* currently active device features */
1059
	netdev_features_t	features;
1060
	/* user-changeable features */
1061
	netdev_features_t	hw_features;
1062
	/* user-requested features */
1063
	netdev_features_t	wanted_features;
1064
	/* mask of features inheritable by VLAN devices */
1065
	netdev_features_t	vlan_features;
1066 1067 1068 1069 1070 1071
	/* 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;
1072

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1073 1074 1075 1076
	/* Interface index. Unique device identifier	*/
	int			ifindex;
	int			iflink;

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1077
	struct net_device_stats	stats;
1078 1079 1080
	atomic_long_t		rx_dropped; /* dropped packets by core network
					     * Do not use this in drivers.
					     */
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1081

1082
#ifdef CONFIG_WIRELESS_EXT
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1083 1084 1085 1086 1087
	/* 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;
1088
#endif
1089 1090
	/* Management operations */
	const struct net_device_ops *netdev_ops;
1091
	const struct ethtool_ops *ethtool_ops;
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1092

1093 1094 1095
	/* Hardware header description */
	const struct header_ops *header_ops;

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1096
	unsigned int		flags;	/* interface flags (a la BSD)	*/
1097 1098
	unsigned int		priv_flags; /* Like 'flags' but invisible to userspace.
					     * See if.h for definitions. */
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1099 1100 1101
	unsigned short		gflags;
	unsigned short		padded;	/* How much padding added by alloc_netdev() */

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1102 1103 1104
	unsigned char		operstate; /* RFC2863 operstate */
	unsigned char		link_mode; /* mapping policy to operstate */

1105 1106 1107
	unsigned char		if_port;	/* Selectable AUI, TP,..*/
	unsigned char		dma;		/* DMA channel		*/

1108
	unsigned int		mtu;	/* interface MTU value		*/
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1109 1110 1111
	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

1112 1113 1114 1115 1116 1117 1118
	/* 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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	/* Interface address info. */
1120
	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1121
	unsigned char		addr_assign_type; /* hw address assignment type */
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	unsigned char		addr_len;	/* hardware address length	*/
1123
	unsigned char		neigh_priv_len;
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1124 1125
	unsigned short          dev_id;		/* for shared network cards */

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1126
	spinlock_t		addr_list_lock;
1127 1128
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
1129
	bool			uc_promisc;
1130 1131
	unsigned int		promiscuity;
	unsigned int		allmulti;
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1132 1133 1134


	/* Protocol specific pointers */
1135

1136
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1137
	struct vlan_info __rcu	*vlan_info;	/* VLAN info */
1138
#endif
1139
#if IS_ENABLED(CONFIG_NET_DSA)
1140
	struct dsa_switch_tree	*dsa_ptr;	/* dsa specific data */
1141
#endif
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1142
	void 			*atalk_ptr;	/* AppleTalk link 	*/
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1143
	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
1144
	struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
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1145
	struct inet6_dev __rcu	*ip6_ptr;       /* IPv6 specific data */
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	void			*ax25_ptr;	/* AX.25 specific data */
1147 1148
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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1150
/*
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1151
 * Cache lines mostly used on receive path (including eth_type_trans())
1152
 */
1153 1154 1155 1156 1157 1158 1159 1160
	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.
						 */

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	struct net_device	*master; /* Pointer to master device of a group,
					  * which this device is member of.
					  */

1165
	/* Interface address info used in eth_type_trans() */
1166 1167 1168 1169
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

1170 1171
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						      hw addresses */
1172 1173

	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/
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1175
#ifdef CONFIG_SYSFS
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1176
	struct kset		*queues_kset;
1177
#endif
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1178

1179
#ifdef CONFIG_RPS
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1180 1181
	struct netdev_rx_queue	*_rx;

1182
	/* Number of RX queues allocated at register_netdev() time */
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1183
	unsigned int		num_rx_queues;
1184 1185 1186

	/* Number of RX queues currently active in device */
	unsigned int		real_num_rx_queues;
1187 1188 1189 1190 1191 1192 1193

#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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#endif
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1195

1196 1197
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1198

1199
	struct netdev_queue __rcu *ingress_queue;
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1200 1201 1202 1203

/*
 * Cache lines mostly used on transmit path
 */
1204
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
1205 1206

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
1207
	unsigned int		num_tx_queues;
1208 1209 1210 1211

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

1212 1213 1214
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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1215
	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
1216
	spinlock_t		tx_global_lock;
E
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1217

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1218
#ifdef CONFIG_XPS
E
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1219
	struct xps_dev_maps __rcu *xps_maps;
T
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1220
#endif
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1221

1222
	/* These may be needed for future network-power-down code. */
1223 1224 1225 1226 1227

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1228 1229 1230 1231 1232
	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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1233
	/* Number of references to this device */
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1234
	int __percpu		*pcpu_refcnt;
1235

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1236 1237 1238 1239 1240
	/* delayed register/unregister */
	struct list_head	todo_list;
	/* device index hash chain */
	struct hlist_node	index_hlist;

1241
	struct list_head	link_watch_list;
1242

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1243 1244
	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1245
	       NETREG_REGISTERED,	/* completed register_netdevice */
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1246 1247 1248
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1249
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1250 1251 1252
	} reg_state:8;

	bool dismantle; /* device is going do be freed */
1253 1254 1255 1256 1257

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1258

1259 1260
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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1261 1262

#ifdef CONFIG_NETPOLL
1263
	struct netpoll_info	*npinfo;
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1264
#endif
1265

1266
#ifdef CONFIG_NET_NS
1267 1268
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1269
#endif
1270

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1271
	/* mid-layer private */
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1272 1273 1274
	union {
		void				*ml_priv;
		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
1275
		struct pcpu_tstats __percpu	*tstats; /* tunnel stats */
1276
		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
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1277
	};
1278
	/* GARP */
E
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1279
	struct garp_port __rcu	*garp_port;
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1280 1281

	/* class/net/name entry */
1282
	struct device		dev;
1283 1284
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
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1285 1286 1287

	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
1288

1289 1290 1291
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1292 1293
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1294

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1295
#ifdef CONFIG_DCB
1296
	/* Data Center Bridging netlink ops */
1297
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1298
#endif
1299 1300 1301
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1302

1303
#if IS_ENABLED(CONFIG_FCOE)
1304 1305
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
1306 1307 1308
#endif
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
	struct netprio_map __rcu *priomap;
1309
#endif
1310 1311
	/* phy device may attach itself for hardware timestamping */
	struct phy_device *phydev;
1312

1313 1314
	struct lock_class_key *qdisc_tx_busylock;

1315 1316
	/* group the device belongs to */
	int group;
1317 1318

	struct pm_qos_request	pm_qos_req;
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1319
};
1320
#define to_net_dev(d) container_of(d, struct net_device, dev)
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1321 1322 1323

#define	NETDEV_ALIGN		32

1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 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
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;
}

1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
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);
}

1394 1395 1396
extern struct netdev_queue *netdev_pick_tx(struct net_device *dev,
					   struct sk_buff *skb);

1397 1398 1399 1400 1401 1402
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
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Eric Dumazet 已提交
1403
	return read_pnet(&dev->nd_net);
1404 1405 1406
}

static inline
1407
void dev_net_set(struct net_device *dev, struct net *net)
1408 1409
{
#ifdef CONFIG_NET_NS
1410 1411
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1412 1413 1414
#endif
}

1415 1416 1417 1418 1419 1420 1421 1422 1423 1424
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;
}

1425 1426 1427 1428 1429 1430 1431 1432 1433 1434
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;
}

1435 1436 1437 1438 1439 1440
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1441
static inline void *netdev_priv(const struct net_device *dev)
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1442
{
1443
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
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1444 1445 1446 1447 1448
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1449
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1451 1452 1453 1454 1455 1456
/* 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))

1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
/**
 *	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.
 */
1467 1468
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1469

1470 1471 1472 1473 1474 1475
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1476 1477 1478
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1479 1480 1481
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1482 1483 1484
	/* Length of frag0. */
	unsigned int frag0_len;

1485 1486 1487
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1488 1489 1490 1491
	/* This is non-zero if the packet cannot be merged with the new skb. */
	int flush;

	/* Number of segments aggregated. */
1492 1493 1494 1495
	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
1496 1497

	/* Free the skb? */
1498
	u8	free;
1499 1500
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2
1501 1502 1503

	/* jiffies when first packet was created/queued */
	unsigned long age;
1504 1505 1506

	/* Used in ipv6_gro_receive() */
	int	proto;
1507 1508 1509

	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
1510 1511 1512
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1513

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1514
struct packet_type {
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1515 1516 1517 1518 1519 1520
	__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 *);
1521 1522
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
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1523 1524 1525 1526
	void			*af_packet_priv;
	struct list_head	list;
};

1527
struct offload_callbacks {
1528
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
1529
						netdev_features_t features);
1530
	int			(*gso_send_check)(struct sk_buff *skb);
1531 1532 1533
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
1534 1535 1536 1537 1538 1539
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
	struct offload_callbacks callbacks;
	struct list_head	 list;
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1540 1541 1542 1543
};

#include <linux/notifier.h>

1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
/* 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
1567
#define NETDEV_UNREGISTER_FINAL 0x0011
1568 1569 1570 1571 1572 1573 1574 1575 1576
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014

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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1577 1578
extern rwlock_t				dev_base_lock;		/* Device list lock */

1579
extern seqcount_t	devnet_rename_seq;	/* Device rename seq */
1580

1581

1582 1583
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1584 1585
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1586 1587
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1588 1589 1590 1591
#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)
1592 1593
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1594
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1595

1596 1597 1598 1599 1600
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1601
	net = dev_net(dev);
1602 1603 1604 1605
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1606 1607 1608 1609 1610 1611
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
1612
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1613 1614 1615
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1616 1617 1618 1619 1620
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);
}
1621

E
Eric Dumazet 已提交
1622 1623 1624 1625 1626 1627 1628
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
1629 1630
extern int 			netdev_boot_setup_check(struct net_device *dev);
extern unsigned long		netdev_boot_base(const char *prefix, int unit);
1631 1632
extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
					      const char *hwaddr);
1633 1634
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
1635 1636 1637
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);
1638 1639 1640
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
1641

E
Eric Dumazet 已提交
1642 1643
extern struct net_device	*dev_get_by_flags_rcu(struct net *net, unsigned short flags,
						      unsigned short mask);
1644
extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
1645
extern struct net_device	*dev_get_by_name_rcu(struct net *net, const char *name);
1646
extern struct net_device	*__dev_get_by_name(struct net *net, const char *name);
L
Linus Torvalds 已提交
1647 1648 1649
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);
1650
extern void		dev_disable_lro(struct net_device *dev);
1651
extern int		dev_loopback_xmit(struct sk_buff *newskb);
L
Linus Torvalds 已提交
1652 1653
extern int		dev_queue_xmit(struct sk_buff *skb);
extern int		register_netdevice(struct net_device *dev);
1654 1655
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1656
extern void		unregister_netdevice_many(struct list_head *head);
1657 1658 1659 1660 1661
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

E
Eric Dumazet 已提交
1662
extern int 		netdev_refcnt_read(const struct net_device *dev);
L
Linus Torvalds 已提交
1663 1664
extern void		free_netdev(struct net_device *dev);
extern void		synchronize_net(void);
1665
extern int		init_dummy_netdev(struct net_device *dev);
1666
extern void		netdev_resync_ops(struct net_device *dev);
1667

1668 1669
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);
1670
extern struct net_device	*dev_get_by_index_rcu(struct net *net, int ifindex);
L
Linus Torvalds 已提交
1671 1672 1673 1674
extern int		dev_restart(struct net_device *dev);
#ifdef CONFIG_NETPOLL_TRAP
extern int		netpoll_trap(void);
#endif
1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
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;
}

1693 1694
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1695
{
1696 1697
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1698

1699 1700 1701 1702
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1703

1704 1705 1706
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
1707 1708 1709
	if (!pskb_may_pull(skb, hlen))
		return NULL;

1710 1711
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
1712
	return skb->data + offset;
1713
}
L
Linus Torvalds 已提交
1714

1715 1716
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1717
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1718 1719
}

H
Herbert Xu 已提交
1720 1721
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1722 1723
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
1724 1725
}

1726 1727
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1728
				  const void *daddr, const void *saddr,
1729
				  unsigned int len)
1730
{
1731
	if (!dev->header_ops || !dev->header_ops->create)
1732
		return 0;
1733 1734

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1735 1736
}

S
Stephen Hemminger 已提交
1737 1738 1739 1740 1741
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1742
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
1743
		return 0;
1744
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
1745 1746
}

L
Linus Torvalds 已提交
1747 1748 1749 1750 1751 1752 1753 1754
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);
}

/*
E
Eric Dumazet 已提交
1755
 * Incoming packets are placed on per-cpu queues
L
Linus Torvalds 已提交
1756
 */
E
Eric Dumazet 已提交
1757
struct softnet_data {
1758
	struct Qdisc		*output_queue;
1759
	struct Qdisc		**output_queue_tailp;
L
Linus Torvalds 已提交
1760 1761
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
1762
	struct sk_buff_head	process_queue;
L
Linus Torvalds 已提交
1763

C
Changli Gao 已提交
1764
	/* stats */
1765 1766 1767 1768
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
C
Changli Gao 已提交
1769

1770
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
1771 1772 1773
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
T
Tom Herbert 已提交
1774
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
1775 1776
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
Tom Herbert 已提交
1777
	unsigned int		input_queue_head;
1778
	unsigned int		input_queue_tail;
1779
#endif
1780
	unsigned int		dropped;
T
Tom Herbert 已提交
1781
	struct sk_buff_head	input_pkt_queue;
1782
	struct napi_struct	backlog;
L
Linus Torvalds 已提交
1783 1784
};

1785
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
1786 1787
{
#ifdef CONFIG_RPS
1788 1789 1790 1791 1792 1793 1794 1795 1796
	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
1797 1798 1799
#endif
}

T
Tom Herbert 已提交
1800
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
1801

1802
extern void __netif_schedule(struct Qdisc *q);
L
Linus Torvalds 已提交
1803

1804
static inline void netif_schedule_queue(struct netdev_queue *txq)
L
Linus Torvalds 已提交
1805
{
1806
	if (!(txq->state & QUEUE_STATE_ANY_XOFF))
1807
		__netif_schedule(txq->qdisc);
1808 1809
}

1810 1811 1812 1813 1814 1815 1816 1817
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));
}

1818 1819
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
1820
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1821 1822
}

1823 1824 1825 1826 1827 1828
/**
 *	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
1829 1830
static inline void netif_start_queue(struct net_device *dev)
{
1831
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1832 1833
}

1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
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);
	}
}

1844
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
L
Linus Torvalds 已提交
1845 1846
{
#ifdef CONFIG_NETPOLL_TRAP
1847
	if (netpoll_trap()) {
1848
		netif_tx_start_queue(dev_queue);
L
Linus Torvalds 已提交
1849
		return;
1850
	}
L
Linus Torvalds 已提交
1851
#endif
1852
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
1853
		__netif_schedule(dev_queue->qdisc);
1854 1855
}

1856 1857 1858 1859 1860 1861 1862
/**
 *	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.
 */
1863 1864
static inline void netif_wake_queue(struct net_device *dev)
{
1865
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1866 1867
}

1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
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);
	}
}

1878 1879
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
1880
	if (WARN_ON(!dev_queue)) {
1881
		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1882 1883
		return;
	}
1884
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1885 1886
}

1887 1888 1889 1890 1891 1892 1893
/**
 *	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
1894 1895
static inline void netif_stop_queue(struct net_device *dev)
{
1896
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1897 1898
}

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
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);
	}
}

1909
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
1910
{
1911
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1912 1913
}

1914 1915 1916 1917 1918 1919
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
1920
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
1921
{
1922
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1923 1924
}

1925
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
1926
{
1927 1928 1929
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

1930
static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
1931 1932 1933 1934
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

1935 1936 1937
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
1938 1939
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955

	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
1956
#endif
1957 1958 1959 1960 1961 1962 1963 1964
}

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,
1965
					     unsigned int pkts, unsigned int bytes)
1966
{
T
Tom Herbert 已提交
1967
#ifdef CONFIG_BQL
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984
	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
1985
#endif
1986 1987 1988
}

static inline void netdev_completed_queue(struct net_device *dev,
1989
					  unsigned int pkts, unsigned int bytes)
1990 1991 1992 1993 1994 1995
{
	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
1996
#ifdef CONFIG_BQL
1997
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
1998 1999
	dql_reset(&q->dql);
#endif
2000 2001 2002 2003 2004
}

static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2005 2006
}

2007 2008 2009 2010 2011 2012
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
2013
static inline bool netif_running(const struct net_device *dev)
L
Linus Torvalds 已提交
2014 2015 2016 2017
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

2018 2019 2020 2021 2022 2023
/*
 * 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.
 */
2024 2025 2026 2027 2028 2029 2030 2031

/**
 *	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.
 */
2032 2033
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
2034
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2035 2036

	netif_tx_start_queue(txq);
2037 2038
}

2039 2040 2041 2042 2043 2044 2045
/**
 *	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.
 */
2046 2047
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
2048
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2049 2050 2051 2052
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2053
	netif_tx_stop_queue(txq);
2054 2055
}

2056 2057 2058 2059 2060 2061 2062
/**
 *	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.
 */
2063 2064
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
2065
{
2066
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2067 2068

	return netif_tx_queue_stopped(txq);
2069 2070
}

2071 2072
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
2073 2074 2075
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
2076 2077 2078 2079 2080 2081 2082 2083

/**
 *	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.
 */
2084 2085
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
2086
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2087 2088 2089 2090
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2091
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2092
		__netif_schedule(txq->qdisc);
2093 2094
}

2095 2096 2097 2098 2099 2100 2101 2102 2103 2104
/*
 * 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);
}

2105 2106 2107 2108 2109 2110
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
2111
static inline bool netif_is_multiqueue(const struct net_device *dev)
2112
{
E
Eric Dumazet 已提交
2113
	return dev->num_tx_queues > 1;
2114
}
L
Linus Torvalds 已提交
2115

2116 2117
extern int netif_set_real_num_tx_queues(struct net_device *dev,
					unsigned int txq);
2118

2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
#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

2130 2131 2132
static inline int netif_copy_real_num_queues(struct net_device *to_dev,
					     const struct net_device *from_dev)
{
2133 2134 2135 2136 2137 2138
	int err;

	err = netif_set_real_num_tx_queues(to_dev,
					   from_dev->real_num_tx_queues);
	if (err)
		return err;
2139 2140 2141 2142 2143 2144 2145 2146
#ifdef CONFIG_RPS
	return netif_set_real_num_rx_queues(to_dev,
					    from_dev->real_num_rx_queues);
#else
	return 0;
#endif
}

2147 2148 2149
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
extern int netif_get_num_default_rss_queues(void);

L
Linus Torvalds 已提交
2150
/* Use this variant when it is known for sure that it
2151 2152
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
L
Linus Torvalds 已提交
2153
 */
2154
extern void dev_kfree_skb_irq(struct sk_buff *skb);
L
Linus Torvalds 已提交
2155 2156

/* Use this variant in places where it could be invoked
2157 2158
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
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2159
 */
2160
extern void dev_kfree_skb_any(struct sk_buff *skb);
L
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2161 2162 2163 2164

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);
2165
extern gro_result_t	napi_gro_receive(struct napi_struct *napi,
2166
					 struct sk_buff *skb);
2167
extern void		napi_gro_flush(struct napi_struct *napi, bool flush_old);
2168
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
2169
extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
2170 2171 2172 2173 2174 2175 2176

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

2177
extern int netdev_rx_handler_register(struct net_device *dev,
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Jiri Pirko 已提交
2178 2179
				      rx_handler_func_t *rx_handler,
				      void *rx_handler_data);
2180 2181
extern void netdev_rx_handler_unregister(struct net_device *dev);

2182
extern bool		dev_valid_name(const char *name);
2183 2184
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
2185
extern unsigned int	dev_get_flags(const struct net_device *);
2186
extern int		__dev_change_flags(struct net_device *, unsigned int flags);
2187
extern int		dev_change_flags(struct net_device *, unsigned int);
2188
extern void		__dev_notify_flags(struct net_device *, unsigned int old_flags);
2189
extern int		dev_change_name(struct net_device *, const char *);
2190
extern int		dev_set_alias(struct net_device *, const char *, size_t);
2191 2192
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
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2193
extern int		dev_set_mtu(struct net_device *, int);
2194
extern void		dev_set_group(struct net_device *, int);
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2195 2196
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
2197
extern int		dev_hard_start_xmit(struct sk_buff *skb,
2198 2199
					    struct net_device *dev,
					    struct netdev_queue *txq);
2200 2201
extern int		dev_forward_skb(struct net_device *dev,
					struct sk_buff *skb);
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2202

2203
extern int		netdev_budget;
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2204 2205 2206 2207

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

2208 2209 2210 2211
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
2212
 * Release reference to device to allow it to be freed.
2213
 */
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2214 2215
static inline void dev_put(struct net_device *dev)
{
2216
	this_cpu_dec(*dev->pcpu_refcnt);
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2217 2218
}

2219 2220 2221 2222
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
2223
 * Hold reference to device to keep it from being freed.
2224
 */
2225 2226
static inline void dev_hold(struct net_device *dev)
{
2227
	this_cpu_inc(*dev->pcpu_refcnt);
2228
}
L
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2229 2230 2231 2232

/* 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
Stefan Rompf 已提交
2233 2234 2235 2236
 *
 * 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.
L
Linus Torvalds 已提交
2237 2238
 */

2239
extern void linkwatch_init_dev(struct net_device *dev);
L
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2240
extern void linkwatch_fire_event(struct net_device *dev);
2241
extern void linkwatch_forget_dev(struct net_device *dev);
L
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2242

2243 2244 2245 2246 2247 2248
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2249
static inline bool netif_carrier_ok(const struct net_device *dev)
L
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2250 2251 2252 2253
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

2254 2255
extern unsigned long dev_trans_start(struct net_device *dev);

L
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2256 2257
extern void __netdev_watchdog_up(struct net_device *dev);

2258
extern void netif_carrier_on(struct net_device *dev);
L
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2259

2260
extern void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
2261

2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274
/**
 *	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.
 *
 */
S
Stefan Rompf 已提交
2275 2276 2277 2278 2279 2280
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2281 2282 2283 2284 2285 2286
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
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2287 2288 2289 2290 2291 2292
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2293 2294 2295 2296 2297 2298
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2299
static inline bool netif_dormant(const struct net_device *dev)
S
Stefan Rompf 已提交
2300 2301 2302 2303 2304
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2305 2306 2307 2308 2309 2310
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
2311
static inline bool netif_oper_up(const struct net_device *dev)
E
Eric Dumazet 已提交
2312
{
S
Stefan Rompf 已提交
2313 2314 2315 2316
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

2317 2318 2319 2320 2321 2322
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
2323
static inline bool netif_device_present(struct net_device *dev)
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2324 2325 2326 2327
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

2328
extern void netif_device_detach(struct net_device *dev);
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2329

2330
extern void netif_device_attach(struct net_device *dev);
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2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380

/*
 * 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;
}

2381
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
2382
{
2383 2384
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
2385 2386
}

2387 2388 2389 2390 2391 2392
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

2393
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2394
{
2395
	bool ok = spin_trylock(&txq->_xmit_lock);
2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
	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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Eric Dumazet 已提交
2413 2414 2415 2416 2417 2418
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

2419 2420 2421 2422 2423 2424
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
2425 2426
static inline void netif_tx_lock(struct net_device *dev)
{
2427
	unsigned int i;
2428
	int cpu;
2429

2430 2431
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
2432 2433
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2434 2435 2436 2437 2438 2439 2440

		/* 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.
		 */
2441
		__netif_tx_lock(txq, cpu);
2442 2443
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
2444
	}
H
Herbert Xu 已提交
2445 2446 2447 2448
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
2449 2450
	local_bh_disable();
	netif_tx_lock(dev);
H
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2451 2452 2453 2454
}

static inline void netif_tx_unlock(struct net_device *dev)
{
2455 2456 2457 2458
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2459

2460 2461 2462 2463 2464
		/* 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);
2465
		netif_schedule_queue(txq);
2466 2467
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
2468 2469 2470 2471
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2472 2473
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
2474 2475
}

2476
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2477
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2478
		__netif_tx_lock(txq, cpu);		\
2479 2480 2481
	}						\
}

2482
#define HARD_TX_UNLOCK(dev, txq) {			\
2483
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2484
		__netif_tx_unlock(txq);			\
2485 2486 2487
	}						\
}

L
Linus Torvalds 已提交
2488 2489
static inline void netif_tx_disable(struct net_device *dev)
{
2490
	unsigned int i;
2491
	int cpu;
2492

2493 2494
	local_bh_disable();
	cpu = smp_processor_id();
2495 2496
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2497 2498

		__netif_tx_lock(txq, cpu);
2499
		netif_tx_stop_queue(txq);
2500
		__netif_tx_unlock(txq);
2501
	}
2502
	local_bh_enable();
L
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2503 2504
}

2505 2506 2507 2508 2509
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

2510 2511 2512 2513 2514
static inline void netif_addr_lock_nested(struct net_device *dev)
{
	spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
}

2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529
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);
}

2530
/*
2531
 * dev_addrs walker. Should be used only for read access. Call with
2532 2533 2534
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2535
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2536

L
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2537 2538 2539 2540 2541
/* 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
2542
extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2543
				       void (*setup)(struct net_device *),
T
Tom Herbert 已提交
2544
				       unsigned int txqs, unsigned int rxqs);
2545
#define alloc_netdev(sizeof_priv, name, setup) \
T
Tom Herbert 已提交
2546 2547 2548 2549 2550
	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
2551 2552
extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
2553

2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
/* 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);

2570
/* Functions used for device addresses handling */
2571
extern int dev_addr_add(struct net_device *dev, const unsigned char *addr,
2572
			unsigned char addr_type);
2573
extern int dev_addr_del(struct net_device *dev, const unsigned char *addr,
2574 2575 2576 2577 2578 2579 2580
			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);
2581 2582 2583 2584
extern void dev_addr_flush(struct net_device *dev);
extern int dev_addr_init(struct net_device *dev);

/* Functions used for unicast addresses handling */
2585 2586 2587
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);
2588 2589 2590 2591
extern int dev_uc_sync(struct net_device *to, struct net_device *from);
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);
2592

2593
/* Functions used for multicast addresses handling */
2594 2595 2596 2597 2598
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);
2599 2600 2601 2602
extern int dev_mc_sync(struct net_device *to, struct net_device *from);
extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
extern void dev_mc_flush(struct net_device *dev);
extern void dev_mc_init(struct net_device *dev);
2603

2604 2605 2606
/* 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);
2607 2608
extern int		dev_set_promiscuity(struct net_device *dev, int inc);
extern int		dev_set_allmulti(struct net_device *dev, int inc);
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Linus Torvalds 已提交
2609
extern void		netdev_state_change(struct net_device *dev);
2610
extern void		netdev_notify_peers(struct net_device *dev);
2611
extern void		netdev_features_change(struct net_device *dev);
L
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2612
/* Load a device via the kmod */
2613
extern void		dev_load(struct net *net, const char *name);
L
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2614
extern void		dev_mcast_init(void);
2615 2616
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					       struct rtnl_link_stats64 *storage);
2617 2618
extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
				    const struct net_device_stats *netdev_stats);
2619

L
Linus Torvalds 已提交
2620
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
2621
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
2622
extern int		weight_p;
2623
extern int		bpf_jit_enable;
L
Linus Torvalds 已提交
2624
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
J
Jiri Pirko 已提交
2625 2626
extern int netdev_set_bond_master(struct net_device *dev,
				  struct net_device *master);
2627
extern int skb_checksum_help(struct sk_buff *skb);
2628 2629
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb,
	netdev_features_t features);
2630 2631 2632 2633 2634 2635 2636
#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
2637 2638 2639 2640
/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

2641 2642 2643 2644 2645 2646
#ifdef CONFIG_PROC_FS
extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
extern void dev_seq_stop(struct seq_file *seq, void *v);
#endif

2647 2648 2649
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

2650 2651
extern struct kobj_ns_type_operations net_ns_type_operations;

2652
extern const char *netdev_drivername(const struct net_device *dev);
2653

2654 2655
extern void linkwatch_run_queue(void);

2656 2657
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
2658 2659 2660
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
2661 2662
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
2663
int __netdev_update_features(struct net_device *dev);
2664
void netdev_update_features(struct net_device *dev);
2665
void netdev_change_features(struct net_device *dev);
2666

2667 2668 2669
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

2670
netdev_features_t netif_skb_features(struct sk_buff *skb);
2671

2672
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
2673
{
2674
	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
2675 2676 2677 2678 2679 2680 2681 2682 2683

	/* 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));

2684
	return (features & feature) == feature;
2685 2686
}

2687
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
2688
{
H
Herbert Xu 已提交
2689
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2690
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2691 2692
}

2693 2694
static inline bool netif_needs_gso(struct sk_buff *skb,
				   netdev_features_t features)
2695
{
2696
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2697 2698
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
2699 2700
}

2701 2702 2703 2704 2705 2706
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

2707
static inline bool netif_is_bond_slave(struct net_device *dev)
J
Jiri Pirko 已提交
2708 2709 2710 2711
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

2712 2713 2714 2715 2716
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

2717
extern struct pernet_operations __net_initdata loopback_net_ops;
2718

2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729
/* 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;
}

2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746
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, ...);
2747

2748 2749 2750
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

2751
#if defined(CONFIG_DYNAMIC_DEBUG)
2752 2753
#define netdev_dbg(__dev, format, args...)			\
do {								\
2754
	dynamic_netdev_dbg(__dev, format, ##args);		\
2755
} while (0)
2756 2757 2758
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787
#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);

2788 2789 2790 2791 2792 2793 2794 2795
/* 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)

2796 2797 2798 2799 2800 2801
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

2802
#define netif_emerg(priv, type, dev, fmt, args...)		\
2803
	netif_level(emerg, priv, type, dev, fmt, ##args)
2804
#define netif_alert(priv, type, dev, fmt, args...)		\
2805
	netif_level(alert, priv, type, dev, fmt, ##args)
2806
#define netif_crit(priv, type, dev, fmt, args...)		\
2807
	netif_level(crit, priv, type, dev, fmt, ##args)
2808
#define netif_err(priv, type, dev, fmt, args...)		\
2809
	netif_level(err, priv, type, dev, fmt, ##args)
2810
#define netif_warn(priv, type, dev, fmt, args...)		\
2811
	netif_level(warn, priv, type, dev, fmt, ##args)
2812
#define netif_notice(priv, type, dev, fmt, args...)		\
2813
	netif_level(notice, priv, type, dev, fmt, ##args)
2814
#define netif_info(priv, type, dev, fmt, args...)		\
2815
	netif_level(info, priv, type, dev, fmt, ##args)
2816

2817
#if defined(CONFIG_DYNAMIC_DEBUG)
2818 2819 2820
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
2821
		dynamic_netdev_dbg(netdev, format, ##args);	\
2822
} while (0)
2823 2824 2825
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
2826 2827 2828 2829 2830 2831 2832 2833 2834 2835
#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)
2836
#define netif_vdbg	netif_dbg
2837 2838 2839 2840
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
2841
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2842 2843 2844
	0;							\
})
#endif
2845

2846
#endif	/* _LINUX_NETDEVICE_H */