netdevice.h 99.4 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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void netdev_set_default_ethtool_ops(struct net_device *dev,
				    const struct ethtool_ops *ops);
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/* hardware address assignment types */
#define NET_ADDR_PERM		0	/* address is permanent (default) */
#define NET_ADDR_RANDOM		1	/* address is generated randomly */
#define NET_ADDR_STOLEN		2	/* address is stolen from other device */
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#define NET_ADDR_SET		3	/* address is set using
					 * dev_set_mac_address() */
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/* Backlog congestion levels */
#define NET_RX_SUCCESS		0	/* keep 'em coming, baby */
#define NET_RX_DROP		1	/* packet dropped */

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

/* qdisc ->enqueue() return codes. */
#define NET_XMIT_SUCCESS	0x00
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#define NET_XMIT_DROP		0x01	/* skb dropped			*/
#define NET_XMIT_CN		0x02	/* congestion notification	*/
#define NET_XMIT_POLICED	0x03	/* skb is shot by police	*/
#define NET_XMIT_MASK		0x0f	/* qdisc flags in net/sch_generic.h */
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/* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
 * indicates that the device will soon be dropping packets, or already drops
 * some packets of the same priority; prompting us to send less aggressively. */
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#define net_xmit_eval(e)	((e) == NET_XMIT_CN ? 0 : (e))
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#define net_xmit_errno(e)	((e) != NET_XMIT_CN ? -ENOBUFS : 0)

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

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

	return false;
}

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

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

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


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

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

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struct neighbour;
struct neigh_parms;
struct sk_buff;

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

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

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#define netdev_hw_addr_list_count(l) ((l)->count)
#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
#define netdev_hw_addr_list_for_each(ha, l) \
	list_for_each_entry(ha, &(l)->list, list)
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#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
#define netdev_for_each_uc_addr(ha, dev) \
	netdev_hw_addr_list_for_each(ha, &(dev)->uc)
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#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
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#define netdev_for_each_mc_addr(ha, dev) \
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	netdev_hw_addr_list_for_each(ha, &(dev)->mc)
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struct hh_cache {
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	u16		hh_len;
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	u16		__pad;
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	seqlock_t	hh_lock;
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	/* cached hardware header; allow for machine alignment needs.        */
#define HH_DATA_MOD	16
#define HH_DATA_OFF(__len) \
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	(HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
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#define HH_DATA_ALIGN(__len) \
	(((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
	unsigned long	hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
};

/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 * Alternative is:
 *   dev->hard_header_len ? (dev->hard_header_len +
 *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 *
 * We could use other alignment values, but we must maintain the
 * relationship HH alignment <= LL alignment.
 */
#define LL_RESERVED_SPACE(dev) \
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	((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
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	((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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struct header_ops {
	int	(*create) (struct sk_buff *skb, struct net_device *dev,
			   unsigned short type, const void *daddr,
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			   const void *saddr, unsigned int len);
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	int	(*parse)(const struct sk_buff *skb, unsigned char *haddr);
	int	(*rebuild)(struct sk_buff *skb);
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	int	(*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
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	void	(*cache_update)(struct hh_cache *hh,
				const struct net_device *dev,
				const unsigned char *haddr);
};

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

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


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

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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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	struct hlist_node	napi_hash_node;
	unsigned int		napi_id;
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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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	NAPI_STATE_HASHED,	/* In NAPI hash */
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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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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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void __napi_complete(struct napi_struct *n);
void napi_complete(struct napi_struct *n);
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/**
 *	napi_by_id - lookup a NAPI by napi_id
 *	@napi_id: hashed napi_id
 *
 * lookup @napi_id in napi_hash table
 * must be called under rcu_read_lock()
 */
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struct napi_struct *napi_by_id(unsigned int napi_id);
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/**
 *	napi_hash_add - add a NAPI to global hashtable
 *	@napi: napi context
 *
 * generate a new napi_id and store a @napi under it in napi_hash
 */
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void napi_hash_add(struct napi_struct *napi);
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/**
 *	napi_hash_del - remove a NAPI from global table
 *	@napi: napi context
 *
 * Warning: caller must observe rcu grace period
 * before freeing memory containing @napi
 */
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void napi_hash_del(struct napi_struct *napi);
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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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	might_sleep();
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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
578
} ____cacheline_aligned_in_smp;
579

580 581 582 583 584
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
585
	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];
};
606
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
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/*
609 610 611
 * 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;
615
	u16 filter;
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	unsigned int last_qtail;
};
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#define RPS_NO_FILTER 0xffff
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/*
 * The rps_dev_flow_table structure contains a table of flow mappings.
 */
struct rps_dev_flow_table {
	unsigned int mask;
	struct rcu_head rcu;
	struct rps_dev_flow flows[0];
};
#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
629
    ((_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) + \
640
    ((_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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667
#ifdef CONFIG_RFS_ACCEL
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bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
			 u16 filter_id);
670
#endif
671
#endif /* CONFIG_RPS */
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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
675
#ifdef CONFIG_RPS
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	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
678
#endif
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	struct kobject			kobj;
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	struct net_device		*dev;
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} ____cacheline_aligned_in_smp;
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/*
 * RX queue sysfs structures and functions.
 */
struct rx_queue_attribute {
	struct attribute attr;
	ssize_t (*show)(struct netdev_rx_queue *queue,
	    struct rx_queue_attribute *attr, char *buf);
	ssize_t (*store)(struct netdev_rx_queue *queue,
	    struct rx_queue_attribute *attr, const char *buf, size_t len);
};
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#ifdef CONFIG_XPS
/*
 * This structure holds an XPS map which can be of variable length.  The
 * map is an array of queues.
 */
struct xps_map {
	unsigned int len;
	unsigned int alloc_len;
	struct rcu_head rcu;
	u16 queues[0];
};
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#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
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#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))	\
    / sizeof(u16))

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

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

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

745 746 747 748 749 750 751 752 753 754
#define MAX_PHYS_PORT_ID_LEN 32

/* This structure holds a unique identifier to identify the
 * physical port used by a netdevice.
 */
struct netdev_phys_port_id {
	unsigned char id[MAX_PHYS_PORT_ID_LEN];
	unsigned char id_len;
};

755 756
/*
 * This structure defines the management hooks for network devices.
757 758
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
 *
 * 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);
780
 *	Called when a packet needs to be transmitted.
781 782
 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
783 784
 *	Required can not be NULL.
 *
785 786
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
 *                         void *accel_priv);
787 788 789
 *	Called to decide which queue to when device supports multiple
 *	transmit queues.
 *
790 791 792 793 794 795
 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 *	This function is called to allow device receiver to make
 *	changes to configuration when multicast or promiscious is enabled.
 *
 * void (*ndo_set_rx_mode)(struct net_device *dev);
 *	This function is called device changes address list filtering.
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 *	If driver handles unicast address filtering, it should set
 *	IFF_UNICAST_FLT to its priv_flags.
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 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *	This function  is called when the Media Access Control address
801
 *	needs to be changed. If this interface is not defined, the
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
 *	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.
 *
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 * void (*ndo_tx_timeout)(struct net_device *dev);
823 824 825
 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
826
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
827
 *                      struct rtnl_link_stats64 *storage);
828
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
829
 *	Called when a user wants to get the network device usage
830
 *	statistics. Drivers must do one of the following:
831 832
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
833
 *	2. Define @ndo_get_stats to update a net_device_stats structure
834 835 836 837 838
 *	   (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.
839
 *
840 841 842
 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16t vid);
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is registered.
843
 *
844
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
845 846
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is unregistered.
847 848
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
849 850 851 852 853
 *
 *	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);
854
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
855 856
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
857
 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
858 859 860
 * 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);
861 862 863 864 865
 * 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.
866
 *
867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
 *	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.
 *
897 898 899 900 901 902 903
 * 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.
 *
904 905 906 907 908 909
 * 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.
 *
910 911 912 913 914 915
 *	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.
916
 *
917
 *	Slave management functions (for bridge, bonding, etc).
918 919 920 921 922
 * 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.
923
 *
924 925 926
 * int (*ndo_get_slave)(struct net_device *slave_dev, struct sk_buff *skb);
 *	Called to fill netlink skb with slave info.
 *
927
 *      Feature/offload setting functions.
928 929
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *		netdev_features_t features);
930 931 932 933
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
934
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
935 936 937 938
 *	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.
 *
939 940
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
941
 *		      const unsigned char *addr, u16 flags)
942
 *	Adds an FDB entry to dev for addr.
943 944
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
945
 *		      const unsigned char *addr)
946 947 948 949 950
 *	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,
954
 *			     struct net_device *dev, u32 filter_mask)
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 *
 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
 *	Called to change device carrier. Soft-devices (like dummy, team, etc)
 *	which do not represent real hardware may define this to allow their
 *	userspace components to manage their virtual carrier state. Devices
 *	that determine carrier state from physical hardware properties (eg
 *	network cables) or protocol-dependent mechanisms (eg
 *	USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
963 964 965 966 967 968
 *
 * int (*ndo_get_phys_port_id)(struct net_device *dev,
 *			       struct netdev_phys_port_id *ppid);
 *	Called to get ID of physical port of this device. If driver does
 *	not implement this, it is assumed that the hw is not able to have
 *	multiple net devices on single physical port.
969 970
 *
 * void (*ndo_add_vxlan_port)(struct  net_device *dev,
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 *			      sa_family_t sa_family, __be16 port);
972 973 974 975 976 977
 *	Called by vxlan to notiy a driver about the UDP port and socket
 *	address family that vxlan is listnening to. It is called only when
 *	a new port starts listening. The operation is protected by the
 *	vxlan_net->sock_lock.
 *
 * void (*ndo_del_vxlan_port)(struct  net_device *dev,
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 *			      sa_family_t sa_family, __be16 port);
979 980 981
 *	Called by vxlan to notify the driver about a UDP port and socket
 *	address family that vxlan is not listening to anymore. The operation
 *	is protected by the vxlan_net->sock_lock.
982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
 *
 * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
 *				 struct net_device *dev)
 *	Called by upper layer devices to accelerate switching or other
 *	station functionality into hardware. 'pdev is the lowerdev
 *	to use for the offload and 'dev' is the net device that will
 *	back the offload. Returns a pointer to the private structure
 *	the upper layer will maintain.
 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv)
 *	Called by upper layer device to delete the station created
 *	by 'ndo_dfwd_add_station'. 'pdev' is the net device backing
 *	the station and priv is the structure returned by the add
 *	operation.
 * netdev_tx_t (*ndo_dfwd_start_xmit)(struct sk_buff *skb,
 *				      struct net_device *dev,
 *				      void *priv);
 *	Callback to use for xmit over the accelerated station. This
 *	is used in place of ndo_start_xmit on accelerated net
 *	devices.
1001 1002 1003 1004 1005 1006
 */
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);
1007
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
1008 1009
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
1010 1011
						    struct sk_buff *skb,
						    void *accel_priv);
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
	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);
1022 1023 1024 1025
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
1026 1027
	void			(*ndo_tx_timeout) (struct net_device *dev);

1028 1029
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
1030 1031
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

1032
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
1033
						       __be16 proto, u16 vid);
1034
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1035
						        __be16 proto, u16 vid);
1036 1037
#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,
1039 1040
						     struct netpoll_info *info,
						     gfp_t gfp);
1041
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
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#endif
1043
#ifdef CONFIG_NET_RX_BUSY_POLL
1044
	int			(*ndo_busy_poll)(struct napi_struct *dev);
1045
#endif
1046 1047 1048 1049 1050 1051
	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);
1052 1053
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
1054 1055 1056
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
1057 1058
	int			(*ndo_set_vf_link_state)(struct net_device *dev,
							 int vf, int link_state);
1059 1060 1061 1062 1063
	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);
1064
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
1065
#if IS_ENABLED(CONFIG_FCOE)
1066 1067
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
1068 1069 1070 1071 1072 1073
	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);
1074 1075 1076 1077
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
1078 1079
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
1080 1081
#endif

1082
#if IS_ENABLED(CONFIG_LIBFCOE)
1083 1084 1085 1086
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
1087
#endif
1088

1089 1090 1091 1092 1093 1094
#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
1095 1096 1097 1098
	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);
1099 1100
	int			(*ndo_get_slave)(struct net_device *slave_dev,
						 struct sk_buff *skb);
1101 1102
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
1103
	int			(*ndo_set_features)(struct net_device *dev,
1104
						    netdev_features_t features);
1105
	int			(*ndo_neigh_construct)(struct neighbour *n);
1106
	void			(*ndo_neigh_destroy)(struct neighbour *n);
1107 1108

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1109
					       struct nlattr *tb[],
1110
					       struct net_device *dev,
1111
					       const unsigned char *addr,
1112 1113
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1114
					       struct nlattr *tb[],
1115
					       struct net_device *dev,
1116
					       const unsigned char *addr);
1117 1118 1119 1120
	int			(*ndo_fdb_dump)(struct sk_buff *skb,
						struct netlink_callback *cb,
						struct net_device *dev,
						int idx);
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John Fastabend 已提交
1121 1122 1123 1124 1125

	int			(*ndo_bridge_setlink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
						      u32 pid, u32 seq,
1126 1127
						      struct net_device *dev,
						      u32 filter_mask);
1128 1129
	int			(*ndo_bridge_dellink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
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Jiri Pirko 已提交
1130 1131
	int			(*ndo_change_carrier)(struct net_device *dev,
						      bool new_carrier);
1132 1133
	int			(*ndo_get_phys_port_id)(struct net_device *dev,
							struct netdev_phys_port_id *ppid);
1134 1135
	void			(*ndo_add_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
J
Joseph Gasparakis 已提交
1136
						      __be16 port);
1137 1138
	void			(*ndo_del_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
J
Joseph Gasparakis 已提交
1139
						      __be16 port);
1140 1141 1142 1143 1144 1145 1146 1147 1148

	void*			(*ndo_dfwd_add_station)(struct net_device *pdev,
							struct net_device *dev);
	void			(*ndo_dfwd_del_station)(struct net_device *pdev,
							void *priv);

	netdev_tx_t		(*ndo_dfwd_start_xmit) (struct sk_buff *skb,
							struct net_device *dev,
							void *priv);
1149 1150
};

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Linus Torvalds 已提交
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
/*
 *	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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Eric Dumazet 已提交
1161
struct net_device {
L
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1162 1163 1164 1165

	/*
	 * 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
1166
	 * of the interface.
L
Linus Torvalds 已提交
1167 1168
	 */
	char			name[IFNAMSIZ];
M
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1169

1170
	/* device name hash chain, please keep it close to name[] */
1171
	struct hlist_node	name_hlist;
1172

1173 1174
	/* snmp alias */
	char 			*ifalias;
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1175 1176 1177 1178 1179 1180 1181 1182

	/*
	 *	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	*/
1183
	int			irq;		/* device IRQ number	*/
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1184 1185 1186 1187 1188 1189 1190 1191

	/*
	 *	Some hardware also needs these fields, but they are not
	 *	part of the usual set specified in Space.c.
	 */

	unsigned long		state;

1192
	struct list_head	dev_list;
1193
	struct list_head	napi_list;
1194
	struct list_head	unreg_list;
1195
	struct list_head	close_list;
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207

	/* directly linked devices, like slaves for bonding */
	struct {
		struct list_head upper;
		struct list_head lower;
	} adj_list;

	/* all linked devices, *including* neighbours */
	struct {
		struct list_head upper;
		struct list_head lower;
	} all_adj_list;
1208

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Linus Torvalds 已提交
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1210
	/* currently active device features */
1211
	netdev_features_t	features;
1212
	/* user-changeable features */
1213
	netdev_features_t	hw_features;
1214
	/* user-requested features */
1215
	netdev_features_t	wanted_features;
1216
	/* mask of features inheritable by VLAN devices */
1217
	netdev_features_t	vlan_features;
1218 1219 1220 1221 1222 1223
	/* 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;
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1224 1225
	/* mask of fetures inheritable by MPLS */
	netdev_features_t	mpls_features;
1226

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1227 1228 1229 1230
	/* Interface index. Unique device identifier	*/
	int			ifindex;
	int			iflink;

R
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1231
	struct net_device_stats	stats;
1232 1233 1234
	atomic_long_t		rx_dropped; /* dropped packets by core network
					     * Do not use this in drivers.
					     */
L
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1235

1236
#ifdef CONFIG_WIRELESS_EXT
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1237 1238 1239 1240 1241
	/* 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;
1242
#endif
1243 1244
	/* Management operations */
	const struct net_device_ops *netdev_ops;
1245
	const struct ethtool_ops *ethtool_ops;
1246
	const struct forwarding_accel_ops *fwd_ops;
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1247

1248 1249 1250
	/* Hardware header description */
	const struct header_ops *header_ops;

S
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1251
	unsigned int		flags;	/* interface flags (a la BSD)	*/
1252 1253
	unsigned int		priv_flags; /* Like 'flags' but invisible to userspace.
					     * See if.h for definitions. */
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1254 1255 1256
	unsigned short		gflags;
	unsigned short		padded;	/* How much padding added by alloc_netdev() */

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1257 1258 1259
	unsigned char		operstate; /* RFC2863 operstate */
	unsigned char		link_mode; /* mapping policy to operstate */

1260 1261 1262
	unsigned char		if_port;	/* Selectable AUI, TP,..*/
	unsigned char		dma;		/* DMA channel		*/

1263
	unsigned int		mtu;	/* interface MTU value		*/
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1264 1265 1266
	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

1267 1268 1269 1270 1271 1272 1273
	/* 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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1274
	/* Interface address info. */
1275
	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1276
	unsigned char		addr_assign_type; /* hw address assignment type */
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Linus Torvalds 已提交
1277
	unsigned char		addr_len;	/* hardware address length	*/
1278
	unsigned short		neigh_priv_len;
1279 1280 1281 1282
	unsigned short          dev_id;		/* Used to differentiate devices
						 * that share the same link
						 * layer address
						 */
J
Jiri Pirko 已提交
1283
	spinlock_t		addr_list_lock;
1284 1285
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
1286 1287 1288 1289 1290 1291 1292
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						    * hw addresses
						    */
#ifdef CONFIG_SYSFS
	struct kset		*queues_kset;
#endif

1293
	bool			uc_promisc;
1294 1295
	unsigned int		promiscuity;
	unsigned int		allmulti;
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1296 1297 1298


	/* Protocol specific pointers */
1299

1300
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1301
	struct vlan_info __rcu	*vlan_info;	/* VLAN info */
1302
#endif
1303
#if IS_ENABLED(CONFIG_NET_DSA)
1304
	struct dsa_switch_tree	*dsa_ptr;	/* dsa specific data */
1305 1306 1307
#endif
#if IS_ENABLED(CONFIG_TIPC)
	struct tipc_bearer __rcu *tipc_ptr;	/* TIPC specific data */
1308
#endif
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Linus Torvalds 已提交
1309
	void 			*atalk_ptr;	/* AppleTalk link 	*/
E
Eric Dumazet 已提交
1310
	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
1311
	struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
E
Eric Dumazet 已提交
1312
	struct inet6_dev __rcu	*ip6_ptr;       /* IPv6 specific data */
L
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1313
	void			*ax25_ptr;	/* AX.25 specific data */
1314 1315
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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Linus Torvalds 已提交
1316

1317
/*
E
Eric Dumazet 已提交
1318
 * Cache lines mostly used on receive path (including eth_type_trans())
1319
 */
1320 1321 1322 1323 1324 1325 1326 1327
	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.
						 */

1328
	/* Interface address info used in eth_type_trans() */
1329 1330 1331 1332
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

T
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1333

1334
#ifdef CONFIG_SYSFS
T
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1335 1336
	struct netdev_rx_queue	*_rx;

1337
	/* Number of RX queues allocated at register_netdev() time */
T
Tom Herbert 已提交
1338
	unsigned int		num_rx_queues;
1339 1340 1341

	/* Number of RX queues currently active in device */
	unsigned int		real_num_rx_queues;
1342

E
Eric Dumazet 已提交
1343
#endif
T
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1344

1345 1346
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1347

1348
	struct netdev_queue __rcu *ingress_queue;
1349 1350
	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/

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1351 1352 1353 1354

/*
 * Cache lines mostly used on transmit path
 */
1355
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
1356 1357

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
1358
	unsigned int		num_tx_queues;
1359 1360 1361 1362

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

1363 1364 1365
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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1366
	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
1367
	spinlock_t		tx_global_lock;
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1368

T
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1369
#ifdef CONFIG_XPS
E
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1370
	struct xps_dev_maps __rcu *xps_maps;
T
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1371
#endif
1372 1373 1374 1375 1376 1377
#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
T
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1378

1379
	/* These may be needed for future network-power-down code. */
1380 1381 1382 1383 1384

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1385 1386 1387 1388 1389
	unsigned long		trans_start;	/* Time (in jiffies) of last Tx	*/

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

L
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1390
	/* Number of references to this device */
E
Eric Dumazet 已提交
1391
	int __percpu		*pcpu_refcnt;
1392

L
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1393 1394 1395 1396 1397
	/* delayed register/unregister */
	struct list_head	todo_list;
	/* device index hash chain */
	struct hlist_node	index_hlist;

1398
	struct list_head	link_watch_list;
1399

L
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1400 1401
	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1402
	       NETREG_REGISTERED,	/* completed register_netdevice */
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1403 1404 1405
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1406
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1407 1408 1409
	} reg_state:8;

	bool dismantle; /* device is going do be freed */
1410 1411 1412 1413 1414

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1415

1416 1417
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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1418 1419

#ifdef CONFIG_NETPOLL
1420
	struct netpoll_info __rcu	*npinfo;
L
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1421
#endif
1422

1423
#ifdef CONFIG_NET_NS
1424 1425
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1426
#endif
1427

D
David S. Miller 已提交
1428
	/* mid-layer private */
E
Eric Dumazet 已提交
1429 1430 1431
	union {
		void				*ml_priv;
		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
1432
		struct pcpu_sw_netstats __percpu	*tstats;
1433
		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
E
Eric Dumazet 已提交
1434
		struct pcpu_vstats __percpu	*vstats; /* veth stats */
E
Eric Dumazet 已提交
1435
	};
1436
	/* GARP */
E
Eric Dumazet 已提交
1437
	struct garp_port __rcu	*garp_port;
1438 1439
	/* MRP */
	struct mrp_port __rcu	*mrp_port;
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1440 1441

	/* class/net/name entry */
1442
	struct device		dev;
1443 1444
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
1445 1446
	/* space for optional per-rx queue attributes */
	const struct attribute_group *sysfs_rx_queue_group;
P
Patrick McHardy 已提交
1447 1448 1449

	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
1450

1451 1452 1453
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1454 1455
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1456

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Jeff Kirsher 已提交
1457
#ifdef CONFIG_DCB
1458
	/* Data Center Bridging netlink ops */
1459
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1460
#endif
1461 1462 1463
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1464

1465
#if IS_ENABLED(CONFIG_FCOE)
1466 1467
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
1468
#endif
1469
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1470
	struct netprio_map __rcu *priomap;
1471
#endif
1472 1473
	/* phy device may attach itself for hardware timestamping */
	struct phy_device *phydev;
1474

1475 1476
	struct lock_class_key *qdisc_tx_busylock;

1477 1478
	/* group the device belongs to */
	int group;
1479 1480

	struct pm_qos_request	pm_qos_req;
L
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1481
};
1482
#define to_net_dev(d) container_of(d, struct net_device, dev)
L
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1483 1484 1485

#define	NETDEV_ALIGN		32

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
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;
}

1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555
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);
}

1556
struct netdev_queue *netdev_pick_tx(struct net_device *dev,
1557 1558
				    struct sk_buff *skb,
				    void *accel_priv);
1559
u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb);
1560

1561 1562 1563 1564 1565 1566
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
Eric Dumazet 已提交
1567
	return read_pnet(&dev->nd_net);
1568 1569 1570
}

static inline
1571
void dev_net_set(struct net_device *dev, struct net *net)
1572 1573
{
#ifdef CONFIG_NET_NS
1574 1575
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1576 1577 1578
#endif
}

1579 1580 1581 1582 1583 1584 1585 1586 1587 1588
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;
}

1589 1590 1591 1592 1593 1594 1595 1596 1597 1598
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;
}

1599 1600 1601 1602 1603 1604
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1605
static inline void *netdev_priv(const struct net_device *dev)
L
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1606
{
1607
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
L
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1608 1609 1610 1611 1612
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1613
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
L
Linus Torvalds 已提交
1614

1615
/* Set the sysfs device type for the network logical device to allow
1616
 * fine-grained identification of different network device types. For
1617 1618 1619 1620
 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

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1621 1622 1623 1624 1625
/* Default NAPI poll() weight
 * Device drivers are strongly advised to not use bigger value
 */
#define NAPI_POLL_WEIGHT 64

1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
/**
 *	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.
 */
1636 1637
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1638

1639 1640 1641 1642 1643 1644
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1645 1646 1647
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1648 1649 1650
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1651 1652 1653
	/* Length of frag0. */
	unsigned int frag0_len;

1654 1655 1656
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1657
	/* This is non-zero if the packet cannot be merged with the new skb. */
1658 1659 1660 1661
	u16	flush;

	/* Save the IP ID here and check when we get to the transport layer */
	u16	flush_id;
1662 1663

	/* Number of segments aggregated. */
1664 1665 1666 1667
	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
1668 1669

	/* Free the skb? */
1670
	u8	free;
1671 1672
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2
1673 1674 1675

	/* jiffies when first packet was created/queued */
	unsigned long age;
1676 1677 1678

	/* Used in ipv6_gro_receive() */
	int	proto;
1679

1680 1681 1682
	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
	__wsum	csum;

1683 1684
	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
1685 1686 1687
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1688

L
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1689
struct packet_type {
D
David S. Miller 已提交
1690 1691 1692 1693 1694 1695
	__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 *);
1696 1697
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
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1698 1699 1700 1701
	void			*af_packet_priv;
	struct list_head	list;
};

1702
struct offload_callbacks {
1703
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
1704
						netdev_features_t features);
1705
	int			(*gso_send_check)(struct sk_buff *skb);
1706 1707
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
1708
	int			(*gro_complete)(struct sk_buff *skb, int nhoff);
1709 1710 1711 1712 1713 1714
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
	struct offload_callbacks callbacks;
	struct list_head	 list;
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1715 1716
};

1717 1718 1719 1720 1721 1722 1723 1724 1725
/* often modified stats are per cpu, other are shared (netdev->stats) */
struct pcpu_sw_netstats {
	u64     rx_packets;
	u64     rx_bytes;
	u64     tx_packets;
	u64     tx_bytes;
	struct u64_stats_sync   syncp;
};

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1726 1727
#include <linux/notifier.h>

1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
/* 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
1741
#define NETDEV_CHANGEMTU	0x0007 /* notify after mtu change happened */
1742 1743 1744 1745 1746 1747 1748 1749 1750
#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
1751
#define NETDEV_UNREGISTER_FINAL 0x0011
1752 1753 1754
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014
1755
#define NETDEV_CHANGEUPPER	0x0015
1756
#define NETDEV_RESEND_IGMP	0x0016
1757
#define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
1758

1759 1760
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);
1761 1762 1763 1764 1765

struct netdev_notifier_info {
	struct net_device *dev;
};

1766 1767 1768 1769 1770
struct netdev_notifier_change_info {
	struct netdev_notifier_info info; /* must be first */
	unsigned int flags_changed;
};

1771 1772 1773 1774 1775 1776
static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
					     struct net_device *dev)
{
	info->dev = dev;
}

1777 1778 1779 1780 1781 1782
static inline struct net_device *
netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
{
	return info->dev;
}

1783
int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1784 1785


L
Linus Torvalds 已提交
1786 1787
extern rwlock_t				dev_base_lock;		/* Device list lock */

1788 1789
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1790 1791
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1792 1793
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1794 1795 1796 1797
#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)
1798 1799
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1800 1801 1802
#define for_each_netdev_in_bond_rcu(bond, slave)	\
		for_each_netdev_rcu(&init_net, slave)	\
			if (netdev_master_upper_dev_get_rcu(slave) == bond)
1803
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1804

1805 1806 1807 1808 1809
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1810
	net = dev_net(dev);
1811 1812 1813 1814
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1815 1816 1817 1818 1819 1820
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
1821
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1822 1823 1824
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1825 1826 1827 1828 1829
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);
}
1830

E
Eric Dumazet 已提交
1831 1832 1833 1834 1835 1836 1837
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);
}

1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860
int netdev_boot_setup_check(struct net_device *dev);
unsigned long netdev_boot_base(const char *prefix, int unit);
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
				       const char *hwaddr);
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
void dev_add_pack(struct packet_type *pt);
void dev_remove_pack(struct packet_type *pt);
void __dev_remove_pack(struct packet_type *pt);
void dev_add_offload(struct packet_offload *po);
void dev_remove_offload(struct packet_offload *po);

struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
					unsigned short mask);
struct net_device *dev_get_by_name(struct net *net, const char *name);
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
struct net_device *__dev_get_by_name(struct net *net, const char *name);
int dev_alloc_name(struct net_device *dev, const char *name);
int dev_open(struct net_device *dev);
int dev_close(struct net_device *dev);
void dev_disable_lro(struct net_device *dev);
int dev_loopback_xmit(struct sk_buff *newskb);
int dev_queue_xmit(struct sk_buff *skb);
1861
int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
1862 1863 1864
int register_netdevice(struct net_device *dev);
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head);
void unregister_netdevice_many(struct list_head *head);
1865 1866 1867 1868 1869
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

1870 1871
int netdev_refcnt_read(const struct net_device *dev);
void free_netdev(struct net_device *dev);
1872
void netdev_freemem(struct net_device *dev);
1873 1874
void synchronize_net(void);
int init_dummy_netdev(struct net_device *dev);
1875

1876 1877 1878 1879 1880
struct net_device *dev_get_by_index(struct net *net, int ifindex);
struct net_device *__dev_get_by_index(struct net *net, int ifindex);
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
int netdev_get_name(struct net *net, char *name, int ifindex);
int dev_restart(struct net_device *dev);
L
Linus Torvalds 已提交
1881
#ifdef CONFIG_NETPOLL_TRAP
1882
int netpoll_trap(void);
L
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1883
#endif
1884
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900

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;
}

1901 1902
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1903
{
1904 1905
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1906

1907 1908 1909 1910
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1911

1912 1913 1914
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
1915 1916 1917
	if (!pskb_may_pull(skb, hlen))
		return NULL;

1918 1919
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
1920
	return skb->data + offset;
1921
}
L
Linus Torvalds 已提交
1922

1923 1924
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1925
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1926 1927
}

H
Herbert Xu 已提交
1928 1929
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1930 1931
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
1932 1933
}

1934 1935 1936 1937 1938 1939 1940 1941
static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
					const void *start, unsigned int len)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
						  csum_partial(start, len, 0));
}

1942 1943
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1944
				  const void *daddr, const void *saddr,
1945
				  unsigned int len)
1946
{
1947
	if (!dev->header_ops || !dev->header_ops->create)
1948
		return 0;
1949 1950

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1951 1952
}

S
Stephen Hemminger 已提交
1953 1954 1955 1956 1957
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1958
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
1959
		return 0;
1960
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
1961 1962
}

1963 1964 1965 1966 1967 1968 1969 1970 1971
static inline int dev_rebuild_header(struct sk_buff *skb)
{
	const struct net_device *dev = skb->dev;

	if (!dev->header_ops || !dev->header_ops->rebuild)
		return 0;
	return dev->header_ops->rebuild(skb);
}

L
Linus Torvalds 已提交
1972
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1973
int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
L
Linus Torvalds 已提交
1974 1975 1976 1977 1978
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

1979
#ifdef CONFIG_NET_FLOW_LIMIT
1980
#define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991
struct sd_flow_limit {
	u64			count;
	unsigned int		num_buckets;
	unsigned int		history_head;
	u16			history[FLOW_LIMIT_HISTORY];
	u8			buckets[];
};

extern int netdev_flow_limit_table_len;
#endif /* CONFIG_NET_FLOW_LIMIT */

L
Linus Torvalds 已提交
1992
/*
E
Eric Dumazet 已提交
1993
 * Incoming packets are placed on per-cpu queues
L
Linus Torvalds 已提交
1994
 */
E
Eric Dumazet 已提交
1995
struct softnet_data {
1996
	struct Qdisc		*output_queue;
1997
	struct Qdisc		**output_queue_tailp;
L
Linus Torvalds 已提交
1998 1999
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
2000
	struct sk_buff_head	process_queue;
L
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2001

C
Changli Gao 已提交
2002
	/* stats */
2003 2004 2005 2006
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
C
Changli Gao 已提交
2007

2008
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
2009 2010 2011
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
T
Tom Herbert 已提交
2012
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
2013 2014
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
Tom Herbert 已提交
2015
	unsigned int		input_queue_head;
2016
	unsigned int		input_queue_tail;
2017
#endif
2018
	unsigned int		dropped;
T
Tom Herbert 已提交
2019
	struct sk_buff_head	input_pkt_queue;
2020
	struct napi_struct	backlog;
2021 2022

#ifdef CONFIG_NET_FLOW_LIMIT
2023
	struct sd_flow_limit __rcu *flow_limit;
2024
#endif
L
Linus Torvalds 已提交
2025 2026
};

2027
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
2028 2029
{
#ifdef CONFIG_RPS
2030 2031 2032 2033 2034 2035 2036 2037 2038
	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
2039 2040 2041
#endif
}

T
Tom Herbert 已提交
2042
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
2043

2044
void __netif_schedule(struct Qdisc *q);
L
Linus Torvalds 已提交
2045

2046
static inline void netif_schedule_queue(struct netdev_queue *txq)
L
Linus Torvalds 已提交
2047
{
2048
	if (!(txq->state & QUEUE_STATE_ANY_XOFF))
2049
		__netif_schedule(txq->qdisc);
2050 2051
}

2052 2053 2054 2055 2056 2057 2058 2059
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));
}

2060 2061
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
2062
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2063 2064
}

2065 2066 2067 2068 2069 2070
/**
 *	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
2071 2072
static inline void netif_start_queue(struct net_device *dev)
{
2073
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2074 2075
}

2076 2077 2078 2079 2080 2081 2082 2083 2084 2085
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);
	}
}

2086
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
L
Linus Torvalds 已提交
2087 2088
{
#ifdef CONFIG_NETPOLL_TRAP
2089
	if (netpoll_trap()) {
2090
		netif_tx_start_queue(dev_queue);
L
Linus Torvalds 已提交
2091
		return;
2092
	}
L
Linus Torvalds 已提交
2093
#endif
2094
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
2095
		__netif_schedule(dev_queue->qdisc);
2096 2097
}

2098 2099 2100 2101 2102 2103 2104
/**
 *	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.
 */
2105 2106
static inline void netif_wake_queue(struct net_device *dev)
{
2107
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2108 2109
}

2110 2111 2112 2113 2114 2115 2116 2117 2118 2119
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);
	}
}

2120 2121
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
2122
	if (WARN_ON(!dev_queue)) {
2123
		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
2124 2125
		return;
	}
2126
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2127 2128
}

2129 2130 2131 2132 2133 2134 2135
/**
 *	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
2136 2137
static inline void netif_stop_queue(struct net_device *dev)
{
2138
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2139 2140
}

2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
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);
	}
}

2151
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2152
{
2153
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2154 2155
}

2156 2157 2158 2159 2160 2161
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
2162
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
2163
{
2164
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2165 2166
}

2167
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2168
{
2169 2170 2171
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

2172
static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2173 2174 2175 2176
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

2177 2178 2179
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
2180 2181
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197

	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
2198
#endif
2199 2200
}

2201 2202 2203 2204 2205 2206 2207 2208 2209
/**
 * 	netdev_sent_queue - report the number of bytes queued to hardware
 * 	@dev: network device
 * 	@bytes: number of bytes queued to the hardware device queue
 *
 * 	Report the number of bytes queued for sending/completion to the network
 * 	device hardware queue. @bytes should be a good approximation and should
 * 	exactly match netdev_completed_queue() @bytes
 */
2210 2211 2212 2213 2214 2215
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,
2216
					     unsigned int pkts, unsigned int bytes)
2217
{
T
Tom Herbert 已提交
2218
#ifdef CONFIG_BQL
2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235
	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
2236
#endif
2237 2238
}

2239 2240 2241 2242 2243 2244 2245 2246 2247 2248
/**
 * 	netdev_completed_queue - report bytes and packets completed by device
 * 	@dev: network device
 * 	@pkts: actual number of packets sent over the medium
 * 	@bytes: actual number of bytes sent over the medium
 *
 * 	Report the number of bytes and packets transmitted by the network device
 * 	hardware queue over the physical medium, @bytes must exactly match the
 * 	@bytes amount passed to netdev_sent_queue()
 */
2249
static inline void netdev_completed_queue(struct net_device *dev,
2250
					  unsigned int pkts, unsigned int bytes)
2251 2252 2253 2254 2255 2256
{
	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
2257
#ifdef CONFIG_BQL
2258
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
2259 2260
	dql_reset(&q->dql);
#endif
2261 2262
}

2263 2264 2265 2266 2267 2268 2269
/**
 * 	netdev_reset_queue - reset the packets and bytes count of a network device
 * 	@dev_queue: network device
 *
 * 	Reset the bytes and packet count of a network device and clear the
 * 	software flow control OFF bit for this network device
 */
2270 2271 2272
static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2273 2274
}

2275 2276 2277 2278 2279 2280
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
2281
static inline bool netif_running(const struct net_device *dev)
L
Linus Torvalds 已提交
2282 2283 2284 2285
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

2286 2287 2288 2289 2290 2291
/*
 * 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.
 */
2292 2293 2294 2295 2296 2297 2298 2299

/**
 *	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.
 */
2300 2301
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
2302
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2303 2304

	netif_tx_start_queue(txq);
2305 2306
}

2307 2308 2309 2310 2311 2312 2313
/**
 *	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.
 */
2314 2315
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
2316
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2317 2318 2319 2320
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2321
	netif_tx_stop_queue(txq);
2322 2323
}

2324 2325 2326 2327 2328 2329 2330
/**
 *	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.
 */
2331 2332
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
2333
{
2334
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2335 2336

	return netif_tx_queue_stopped(txq);
2337 2338
}

2339 2340
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
2341 2342 2343
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
2344 2345 2346 2347 2348 2349 2350 2351

/**
 *	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.
 */
2352 2353
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
2354
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2355 2356 2357 2358
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2359
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2360
		__netif_schedule(txq->qdisc);
2361 2362
}

2363
#ifdef CONFIG_XPS
2364
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2365
			u16 index);
2366 2367
#else
static inline int netif_set_xps_queue(struct net_device *dev,
2368
				      const struct cpumask *mask,
2369 2370 2371 2372 2373 2374
				      u16 index)
{
	return 0;
}
#endif

2375 2376 2377 2378 2379 2380 2381 2382 2383 2384
/*
 * 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);
}

2385 2386 2387 2388 2389 2390
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
2391
static inline bool netif_is_multiqueue(const struct net_device *dev)
2392
{
E
Eric Dumazet 已提交
2393
	return dev->num_tx_queues > 1;
2394
}
L
Linus Torvalds 已提交
2395

2396
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
2397

2398
#ifdef CONFIG_SYSFS
2399
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
2400 2401 2402 2403 2404 2405 2406 2407
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

2408 2409 2410
static inline int netif_copy_real_num_queues(struct net_device *to_dev,
					     const struct net_device *from_dev)
{
2411 2412 2413 2414 2415 2416
	int err;

	err = netif_set_real_num_tx_queues(to_dev,
					   from_dev->real_num_tx_queues);
	if (err)
		return err;
2417
#ifdef CONFIG_SYSFS
2418 2419 2420 2421 2422 2423 2424
	return netif_set_real_num_rx_queues(to_dev,
					    from_dev->real_num_rx_queues);
#else
	return 0;
#endif
}

2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
#ifdef CONFIG_SYSFS
static inline unsigned int get_netdev_rx_queue_index(
		struct netdev_rx_queue *queue)
{
	struct net_device *dev = queue->dev;
	int index = queue - dev->_rx;

	BUG_ON(index >= dev->num_rx_queues);
	return index;
}
#endif

2437
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
2438
int netif_get_num_default_rss_queues(void);
2439

2440 2441 2442 2443 2444 2445 2446
enum skb_free_reason {
	SKB_REASON_CONSUMED,
	SKB_REASON_DROPPED,
};

void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason);
void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason);
L
Linus Torvalds 已提交
2447

2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
/*
 * It is not allowed to call kfree_skb() or consume_skb() from hardware
 * interrupt context or with hardware interrupts being disabled.
 * (in_irq() || irqs_disabled())
 *
 * We provide four helpers that can be used in following contexts :
 *
 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context,
 *  replacing kfree_skb(skb)
 *
 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context.
 *  Typically used in place of consume_skb(skb) in TX completion path
 *
 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context,
 *  replacing kfree_skb(skb)
 *
 * dev_consume_skb_any(skb) when caller doesn't know its current irq context,
 *  and consumed a packet. Used in place of consume_skb(skb)
L
Linus Torvalds 已提交
2466
 */
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485
static inline void dev_kfree_skb_irq(struct sk_buff *skb)
{
	__dev_kfree_skb_irq(skb, SKB_REASON_DROPPED);
}

static inline void dev_consume_skb_irq(struct sk_buff *skb)
{
	__dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED);
}

static inline void dev_kfree_skb_any(struct sk_buff *skb)
{
	__dev_kfree_skb_any(skb, SKB_REASON_DROPPED);
}

static inline void dev_consume_skb_any(struct sk_buff *skb)
{
	__dev_kfree_skb_any(skb, SKB_REASON_CONSUMED);
}
L
Linus Torvalds 已提交
2486

2487 2488 2489 2490 2491 2492 2493
int netif_rx(struct sk_buff *skb);
int netif_rx_ni(struct sk_buff *skb);
int netif_receive_skb(struct sk_buff *skb);
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
void napi_gro_flush(struct napi_struct *napi, bool flush_old);
struct sk_buff *napi_get_frags(struct napi_struct *napi);
gro_result_t napi_gro_frags(struct napi_struct *napi);
2494 2495
struct packet_offload *gro_find_receive_by_type(__be16 type);
struct packet_offload *gro_find_complete_by_type(__be16 type);
2496 2497 2498 2499 2500 2501 2502

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

2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513
int netdev_rx_handler_register(struct net_device *dev,
			       rx_handler_func_t *rx_handler,
			       void *rx_handler_data);
void netdev_rx_handler_unregister(struct net_device *dev);

bool dev_valid_name(const char *name);
int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
int dev_ethtool(struct net *net, struct ifreq *);
unsigned int dev_get_flags(const struct net_device *);
int __dev_change_flags(struct net_device *, unsigned int flags);
int dev_change_flags(struct net_device *, unsigned int);
2514 2515
void __dev_notify_flags(struct net_device *, unsigned int old_flags,
			unsigned int gchanges);
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525
int dev_change_name(struct net_device *, const char *);
int dev_set_alias(struct net_device *, const char *, size_t);
int dev_change_net_namespace(struct net_device *, struct net *, const char *);
int dev_set_mtu(struct net_device *, int);
void dev_set_group(struct net_device *, int);
int dev_set_mac_address(struct net_device *, struct sockaddr *);
int dev_change_carrier(struct net_device *, bool new_carrier);
int dev_get_phys_port_id(struct net_device *dev,
			 struct netdev_phys_port_id *ppid);
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2526
			struct netdev_queue *txq);
2527
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
L
Linus Torvalds 已提交
2528

2529
extern int		netdev_budget;
L
Linus Torvalds 已提交
2530 2531

/* Called by rtnetlink.c:rtnl_unlock() */
2532
void netdev_run_todo(void);
L
Linus Torvalds 已提交
2533

2534 2535 2536 2537
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
2538
 * Release reference to device to allow it to be freed.
2539
 */
L
Linus Torvalds 已提交
2540 2541
static inline void dev_put(struct net_device *dev)
{
2542
	this_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
2543 2544
}

2545 2546 2547 2548
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
2549
 * Hold reference to device to keep it from being freed.
2550
 */
2551 2552
static inline void dev_hold(struct net_device *dev)
{
2553
	this_cpu_inc(*dev->pcpu_refcnt);
2554
}
L
Linus Torvalds 已提交
2555 2556 2557 2558

/* 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
2559 2560 2561 2562
 *
 * 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
2563 2564
 */

2565 2566 2567
void linkwatch_init_dev(struct net_device *dev);
void linkwatch_fire_event(struct net_device *dev);
void linkwatch_forget_dev(struct net_device *dev);
L
Linus Torvalds 已提交
2568

2569 2570 2571 2572 2573 2574
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2575
static inline bool netif_carrier_ok(const struct net_device *dev)
L
Linus Torvalds 已提交
2576 2577 2578 2579
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

2580
unsigned long dev_trans_start(struct net_device *dev);
2581

2582
void __netdev_watchdog_up(struct net_device *dev);
L
Linus Torvalds 已提交
2583

2584
void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
2585

2586
void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
2587

2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600
/**
 *	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
2601 2602 2603 2604 2605 2606
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2607 2608 2609 2610 2611 2612
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
2613 2614 2615 2616 2617 2618
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2619 2620 2621 2622 2623 2624
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2625
static inline bool netif_dormant(const struct net_device *dev)
S
Stefan Rompf 已提交
2626 2627 2628 2629 2630
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2631 2632 2633 2634 2635 2636
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
2637
static inline bool netif_oper_up(const struct net_device *dev)
E
Eric Dumazet 已提交
2638
{
S
Stefan Rompf 已提交
2639 2640 2641 2642
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

2643 2644 2645 2646 2647 2648
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
2649
static inline bool netif_device_present(struct net_device *dev)
L
Linus Torvalds 已提交
2650 2651 2652 2653
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

2654
void netif_device_detach(struct net_device *dev);
L
Linus Torvalds 已提交
2655

2656
void netif_device_attach(struct net_device *dev);
L
Linus Torvalds 已提交
2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706

/*
 * 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;
}

2707
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
2708
{
2709 2710
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
2711 2712
}

2713 2714 2715 2716 2717 2718
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

2719
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2720
{
2721
	bool ok = spin_trylock(&txq->_xmit_lock);
2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738
	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);
}

E
Eric Dumazet 已提交
2739 2740 2741 2742 2743 2744
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

2745 2746 2747 2748 2749 2750
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
2751 2752
static inline void netif_tx_lock(struct net_device *dev)
{
2753
	unsigned int i;
2754
	int cpu;
2755

2756 2757
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
2758 2759
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2760 2761 2762 2763 2764 2765 2766

		/* 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.
		 */
2767
		__netif_tx_lock(txq, cpu);
2768 2769
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
2770
	}
H
Herbert Xu 已提交
2771 2772 2773 2774
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
2775 2776
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
2777 2778 2779 2780
}

static inline void netif_tx_unlock(struct net_device *dev)
{
2781 2782 2783 2784
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2785

2786 2787 2788 2789 2790
		/* 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);
2791
		netif_schedule_queue(txq);
2792 2793
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
2794 2795 2796 2797
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2798 2799
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
2800 2801
}

2802
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2803
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2804
		__netif_tx_lock(txq, cpu);		\
2805 2806 2807
	}						\
}

2808
#define HARD_TX_UNLOCK(dev, txq) {			\
2809
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2810
		__netif_tx_unlock(txq);			\
2811 2812 2813
	}						\
}

L
Linus Torvalds 已提交
2814 2815
static inline void netif_tx_disable(struct net_device *dev)
{
2816
	unsigned int i;
2817
	int cpu;
2818

2819 2820
	local_bh_disable();
	cpu = smp_processor_id();
2821 2822
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2823 2824

		__netif_tx_lock(txq, cpu);
2825
		netif_tx_stop_queue(txq);
2826
		__netif_tx_unlock(txq);
2827
	}
2828
	local_bh_enable();
L
Linus Torvalds 已提交
2829 2830
}

2831 2832 2833 2834 2835
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

2836 2837 2838 2839 2840
static inline void netif_addr_lock_nested(struct net_device *dev)
{
	spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
}

2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855
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);
}

2856
/*
2857
 * dev_addrs walker. Should be used only for read access. Call with
2858 2859 2860
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2861
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2862

L
Linus Torvalds 已提交
2863 2864
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

2865
void ether_setup(struct net_device *dev);
L
Linus Torvalds 已提交
2866 2867

/* Support for loadable net-drivers */
2868 2869 2870
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
				    void (*setup)(struct net_device *),
				    unsigned int txqs, unsigned int rxqs);
2871
#define alloc_netdev(sizeof_priv, name, setup) \
T
Tom Herbert 已提交
2872 2873 2874 2875 2876
	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)

2877 2878
int register_netdev(struct net_device *dev);
void unregister_netdev(struct net_device *dev);
2879

2880
/* General hardware address lists handling functions */
2881 2882 2883 2884 2885
int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
		   struct netdev_hw_addr_list *from_list, int addr_len);
void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
		      struct netdev_hw_addr_list *from_list, int addr_len);
void __hw_addr_init(struct netdev_hw_addr_list *list);
2886

2887
/* Functions used for device addresses handling */
2888 2889 2890 2891 2892 2893
int dev_addr_add(struct net_device *dev, const unsigned char *addr,
		 unsigned char addr_type);
int dev_addr_del(struct net_device *dev, const unsigned char *addr,
		 unsigned char addr_type);
void dev_addr_flush(struct net_device *dev);
int dev_addr_init(struct net_device *dev);
2894 2895

/* Functions used for unicast addresses handling */
2896 2897 2898 2899 2900 2901 2902 2903
int dev_uc_add(struct net_device *dev, const unsigned char *addr);
int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
int dev_uc_del(struct net_device *dev, const unsigned char *addr);
int dev_uc_sync(struct net_device *to, struct net_device *from);
int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
void dev_uc_unsync(struct net_device *to, struct net_device *from);
void dev_uc_flush(struct net_device *dev);
void dev_uc_init(struct net_device *dev);
2904

2905
/* Functions used for multicast addresses handling */
2906 2907 2908 2909 2910 2911 2912 2913 2914 2915
int dev_mc_add(struct net_device *dev, const unsigned char *addr);
int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
int dev_mc_del(struct net_device *dev, const unsigned char *addr);
int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
int dev_mc_sync(struct net_device *to, struct net_device *from);
int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
void dev_mc_unsync(struct net_device *to, struct net_device *from);
void dev_mc_flush(struct net_device *dev);
void dev_mc_init(struct net_device *dev);
2916

2917
/* Functions used for secondary unicast and multicast support */
2918 2919 2920 2921 2922 2923 2924
void dev_set_rx_mode(struct net_device *dev);
void __dev_set_rx_mode(struct net_device *dev);
int dev_set_promiscuity(struct net_device *dev, int inc);
int dev_set_allmulti(struct net_device *dev, int inc);
void netdev_state_change(struct net_device *dev);
void netdev_notify_peers(struct net_device *dev);
void netdev_features_change(struct net_device *dev);
L
Linus Torvalds 已提交
2925
/* Load a device via the kmod */
2926 2927 2928 2929 2930
void dev_load(struct net *net, const char *name);
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					struct rtnl_link_stats64 *storage);
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
			     const struct net_device_stats *netdev_stats);
2931

L
Linus Torvalds 已提交
2932
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
2933
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
2934
extern int		weight_p;
2935
extern int		bpf_jit_enable;
J
Jiri Pirko 已提交
2936

2937 2938 2939
bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
2940 2941

/* iterate through upper list, must be called under RCU read lock */
2942 2943 2944 2945 2946
#define netdev_for_each_all_upper_dev_rcu(dev, updev, iter) \
	for (iter = &(dev)->all_adj_list.upper, \
	     updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)); \
	     updev; \
	     updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)))
2947

2948 2949 2950 2951
void *netdev_lower_get_next_private(struct net_device *dev,
				    struct list_head **iter);
void *netdev_lower_get_next_private_rcu(struct net_device *dev,
					struct list_head **iter);
2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964

#define netdev_for_each_lower_private(dev, priv, iter) \
	for (iter = (dev)->adj_list.lower.next, \
	     priv = netdev_lower_get_next_private(dev, &(iter)); \
	     priv; \
	     priv = netdev_lower_get_next_private(dev, &(iter)))

#define netdev_for_each_lower_private_rcu(dev, priv, iter) \
	for (iter = &(dev)->adj_list.lower, \
	     priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \
	     priv; \
	     priv = netdev_lower_get_next_private_rcu(dev, &(iter)))

2965
void *netdev_adjacent_get_private(struct list_head *adj_list);
2966
void *netdev_lower_get_first_private_rcu(struct net_device *dev);
2967 2968 2969 2970
struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev);
int netdev_master_upper_dev_link(struct net_device *dev,
J
Jiri Pirko 已提交
2971
				 struct net_device *upper_dev);
2972 2973 2974 2975 2976
int netdev_master_upper_dev_link_private(struct net_device *dev,
					 struct net_device *upper_dev,
					 void *private);
void netdev_upper_dev_unlink(struct net_device *dev,
			     struct net_device *upper_dev);
2977
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
2978 2979 2980 2981 2982 2983 2984
void *netdev_lower_dev_get_private(struct net_device *dev,
				   struct net_device *lower_dev);
int skb_checksum_help(struct sk_buff *skb);
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
				  netdev_features_t features, bool tx_path);
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
				    netdev_features_t features);
2985 2986 2987 2988 2989 2990

static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
	return __skb_gso_segment(skb, features, true);
}
2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003
__be16 skb_network_protocol(struct sk_buff *skb);

static inline bool can_checksum_protocol(netdev_features_t features,
					 __be16 protocol)
{
	return ((features & NETIF_F_GEN_CSUM) ||
		((features & NETIF_F_V4_CSUM) &&
		 protocol == htons(ETH_P_IP)) ||
		((features & NETIF_F_V6_CSUM) &&
		 protocol == htons(ETH_P_IPV6)) ||
		((features & NETIF_F_FCOE_CRC) &&
		 protocol == htons(ETH_P_FCOE)));
}
3004

3005
#ifdef CONFIG_BUG
3006
void netdev_rx_csum_fault(struct net_device *dev);
3007 3008 3009 3010 3011
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
L
Linus Torvalds 已提交
3012
/* rx skb timestamps */
3013 3014
void net_enable_timestamp(void);
void net_disable_timestamp(void);
L
Linus Torvalds 已提交
3015

3016
#ifdef CONFIG_PROC_FS
3017
int __init dev_proc_init(void);
3018 3019
#else
#define dev_proc_init() 0
3020 3021
#endif

3022 3023 3024 3025
int netdev_class_create_file_ns(struct class_attribute *class_attr,
				const void *ns);
void netdev_class_remove_file_ns(struct class_attribute *class_attr,
				 const void *ns);
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035

static inline int netdev_class_create_file(struct class_attribute *class_attr)
{
	return netdev_class_create_file_ns(class_attr, NULL);
}

static inline void netdev_class_remove_file(struct class_attribute *class_attr)
{
	netdev_class_remove_file_ns(class_attr, NULL);
}
3036

3037 3038
extern struct kobj_ns_type_operations net_ns_type_operations;

3039
const char *netdev_drivername(const struct net_device *dev);
3040

3041
void linkwatch_run_queue(void);
3042

3043 3044
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
3045 3046 3047
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
3048 3049
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060

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

3061
int __netdev_update_features(struct net_device *dev);
3062
void netdev_update_features(struct net_device *dev);
3063
void netdev_change_features(struct net_device *dev);
3064

3065 3066 3067
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

3068
netdev_features_t netif_skb_features(struct sk_buff *skb);
3069

3070
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
3071
{
3072
	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
3073 3074 3075 3076 3077 3078 3079 3080 3081

	/* 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));

3082
	return (features & feature) == feature;
3083 3084
}

3085
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
3086
{
H
Herbert Xu 已提交
3087
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
3088
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
3089 3090
}

3091 3092
static inline bool netif_needs_gso(struct sk_buff *skb,
				   netdev_features_t features)
3093
{
3094
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
3095 3096
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
3097 3098
}

3099 3100 3101 3102 3103 3104
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117
static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
					int pulled_hlen, u16 mac_offset,
					int mac_len)
{
	skb->protocol = protocol;
	skb->encapsulation = 1;
	skb_push(skb, pulled_hlen);
	skb_reset_transport_header(skb);
	skb->mac_header = mac_offset;
	skb->network_header = skb->mac_header + mac_len;
	skb->mac_len = mac_len;
}

3118 3119 3120 3121 3122
static inline bool netif_is_macvlan(struct net_device *dev)
{
	return dev->priv_flags & IFF_MACVLAN;
}

3123 3124 3125 3126 3127
static inline bool netif_is_bond_master(struct net_device *dev)
{
	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
}

3128
static inline bool netif_is_bond_slave(struct net_device *dev)
J
Jiri Pirko 已提交
3129 3130 3131 3132
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

3133 3134 3135 3136 3137
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

3138
extern struct pernet_operations __net_initdata loopback_net_ops;
3139

3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150
/* 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;
}

3151
__printf(3, 4)
3152 3153
int netdev_printk(const char *level, const struct net_device *dev,
		  const char *format, ...);
3154
__printf(2, 3)
3155
int netdev_emerg(const struct net_device *dev, const char *format, ...);
3156
__printf(2, 3)
3157
int netdev_alert(const struct net_device *dev, const char *format, ...);
3158
__printf(2, 3)
3159
int netdev_crit(const struct net_device *dev, const char *format, ...);
3160
__printf(2, 3)
3161
int netdev_err(const struct net_device *dev, const char *format, ...);
3162
__printf(2, 3)
3163
int netdev_warn(const struct net_device *dev, const char *format, ...);
3164
__printf(2, 3)
3165
int netdev_notice(const struct net_device *dev, const char *format, ...);
3166
__printf(2, 3)
3167
int netdev_info(const struct net_device *dev, const char *format, ...);
3168

3169 3170 3171
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

3172
#if defined(CONFIG_DYNAMIC_DEBUG)
3173 3174
#define netdev_dbg(__dev, format, args...)			\
do {								\
3175
	dynamic_netdev_dbg(__dev, format, ##args);		\
3176
} while (0)
3177 3178 3179
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206
#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...)			\
3207
	WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args)
3208

3209 3210 3211 3212 3213 3214 3215 3216
/* 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)

3217 3218 3219 3220 3221 3222
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

3223
#define netif_emerg(priv, type, dev, fmt, args...)		\
3224
	netif_level(emerg, priv, type, dev, fmt, ##args)
3225
#define netif_alert(priv, type, dev, fmt, args...)		\
3226
	netif_level(alert, priv, type, dev, fmt, ##args)
3227
#define netif_crit(priv, type, dev, fmt, args...)		\
3228
	netif_level(crit, priv, type, dev, fmt, ##args)
3229
#define netif_err(priv, type, dev, fmt, args...)		\
3230
	netif_level(err, priv, type, dev, fmt, ##args)
3231
#define netif_warn(priv, type, dev, fmt, args...)		\
3232
	netif_level(warn, priv, type, dev, fmt, ##args)
3233
#define netif_notice(priv, type, dev, fmt, args...)		\
3234
	netif_level(notice, priv, type, dev, fmt, ##args)
3235
#define netif_info(priv, type, dev, fmt, args...)		\
3236
	netif_level(info, priv, type, dev, fmt, ##args)
3237

3238
#if defined(CONFIG_DYNAMIC_DEBUG)
3239 3240 3241
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
3242
		dynamic_netdev_dbg(netdev, format, ##args);	\
3243
} while (0)
3244 3245 3246
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
3247 3248 3249 3250 3251 3252 3253 3254 3255 3256
#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)
3257
#define netif_vdbg	netif_dbg
3258 3259 3260 3261
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
3262
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
3263 3264 3265
	0;							\
})
#endif
3266

3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296
/*
 *	The list of packet types we will receive (as opposed to discard)
 *	and the routines to invoke.
 *
 *	Why 16. Because with 16 the only overlap we get on a hash of the
 *	low nibble of the protocol value is RARP/SNAP/X.25.
 *
 *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
 *             sure which should go first, but I bet it won't make much
 *             difference if we are running VLANs.  The good news is that
 *             this protocol won't be in the list unless compiled in, so
 *             the average user (w/out VLANs) will not be adversely affected.
 *             --BLG
 *
 *		0800	IP
 *		8100    802.1Q VLAN
 *		0001	802.3
 *		0002	AX.25
 *		0004	802.2
 *		8035	RARP
 *		0005	SNAP
 *		0805	X.25
 *		0806	ARP
 *		8137	IPX
 *		0009	Localtalk
 *		86DD	IPv6
 */
#define PTYPE_HASH_SIZE	(16)
#define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)

3297
#endif	/* _LINUX_NETDEVICE_H */