netdevice.h 117.4 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 <linux/prefetch.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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/* 802.15.4 specific */
struct wpan_dev;
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void netdev_set_default_ethtool_ops(struct net_device *dev,
				    const struct ethtool_ops *ops);
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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 hrtimer		timer;
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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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void __napi_schedule_irqoff(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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/**
 *	napi_schedule_irqoff - schedule NAPI poll
 *	@n: napi context
 *
 * Variant of napi_schedule(), assuming hard irqs are masked.
 */
static inline void napi_schedule_irqoff(struct napi_struct *n)
{
	if (napi_schedule_prep(n))
		__napi_schedule_irqoff(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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void __napi_complete(struct napi_struct *n);
void napi_complete_done(struct napi_struct *n, int work_done);
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/**
 *	napi_complete - NAPI processing complete
 *	@n: napi context
 *
 * Mark NAPI processing as complete.
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 * Consider using napi_complete_done() instead.
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 */
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static inline void napi_complete(struct napi_struct *n)
{
	return napi_complete_done(n, 0);
}
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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.
 */
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void napi_disable(struct napi_struct *n);
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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));
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	smp_mb__before_atomic();
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	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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};
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#define QUEUE_STATE_DRV_XOFF	(1 << __QUEUE_STATE_DRV_XOFF)
#define QUEUE_STATE_STACK_XOFF	(1 << __QUEUE_STATE_STACK_XOFF)
#define QUEUE_STATE_FROZEN	(1 << __QUEUE_STATE_FROZEN)

#define QUEUE_STATE_ANY_XOFF	(QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF)
#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
					QUEUE_STATE_FROZEN)
#define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \
					QUEUE_STATE_FROZEN)

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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 __rcu	*qdisc;
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	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;
574 575 576 577
	/*
	 * 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
590
} ____cacheline_aligned_in_smp;
591

592 593 594 595 596
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
597
	return NUMA_NO_NODE;
598 599 600 601 602 603 604 605 606 607
#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];
};
618
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
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/*
621 622 623
 * 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;
627
	u16 filter;
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	unsigned int last_qtail;
};
630
#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) + \
641
    ((_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) + \
652
    ((_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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679
#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);
682
#endif
683
#endif /* CONFIG_RPS */
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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
687
#ifdef CONFIG_RPS
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	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
690
#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;
};

740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
#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

757
#define MAX_PHYS_ITEM_ID_LEN 32
758

759 760
/* This structure holds a unique identifier to identify some
 * physical item (port for example) used by a netdevice.
761
 */
762 763
struct netdev_phys_item_id {
	unsigned char id[MAX_PHYS_ITEM_ID_LEN];
764 765 766
	unsigned char id_len;
};

767 768 769
typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
				       struct sk_buff *skb);

770 771
/*
 * This structure defines the management hooks for network devices.
772 773
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
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 *
 * int (*ndo_init)(struct net_device *dev);
 *     This function is called once when network device is registered.
 *     The network device can use this to any late stage initializaton
 *     or semantic validattion. It can fail with an error code which will
 *     be propogated back to register_netdev
 *
 * void (*ndo_uninit)(struct net_device *dev);
 *     This function is called when device is unregistered or when registration
 *     fails. It is not called if init fails.
 *
 * int (*ndo_open)(struct net_device *dev);
 *     This function is called when network device transistions to the up
 *     state.
 *
 * int (*ndo_stop)(struct net_device *dev);
 *     This function is called when network device transistions to the down
 *     state.
 *
793 794
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
795
 *	Called when a packet needs to be transmitted.
796 797
 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
798 799
 *	Required can not be NULL.
 *
800
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
801
 *                         void *accel_priv, select_queue_fallback_t fallback);
802 803 804
 *	Called to decide which queue to when device supports multiple
 *	transmit queues.
 *
805 806 807 808 809 810
 * 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.
811 812
 *	If driver handles unicast address filtering, it should set
 *	IFF_UNICAST_FLT to its priv_flags.
813 814 815
 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *	This function  is called when the Media Access Control address
816
 *	needs to be changed. If this interface is not defined, the
817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
 *	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.
 *
837
 * void (*ndo_tx_timeout)(struct net_device *dev);
838 839 840
 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
841
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
842
 *                      struct rtnl_link_stats64 *storage);
843
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
844
 *	Called when a user wants to get the network device usage
845
 *	statistics. Drivers must do one of the following:
846 847
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
848
 *	2. Define @ndo_get_stats to update a net_device_stats structure
849 850 851 852 853
 *	   (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.
854
 *
855 856 857
 * 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.
858
 *
859
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
860 861
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is unregistered.
862 863
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
864 865 866 867
 *
 *	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);
868 869
 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
 *			  int max_tx_rate);
870
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
871 872
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
873
 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
874 875 876
 * 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);
877 878 879 880 881
 * 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.
882
 *
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912
 *	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.
 *
913 914 915 916 917 918 919
 * 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.
 *
920 921 922 923 924 925
 * 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.
 *
926 927 928 929 930 931
 *	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.
932
 *
933
 *	Slave management functions (for bridge, bonding, etc).
934 935 936 937 938
 * 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.
939 940
 *
 *      Feature/offload setting functions.
941 942
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *		netdev_features_t features);
943 944 945 946
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
947
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
948 949 950 951
 *	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.
 *
952 953
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
954
 *		      const unsigned char *addr, u16 vid, u16 flags)
955
 *	Adds an FDB entry to dev for addr.
956 957
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
958
 *		      const unsigned char *addr, u16 vid)
959 960
 *	Deletes the FDB entry from dev coresponding to addr.
 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
961 962
 *		       struct net_device *dev, struct net_device *filter_dev,
 *		       int idx)
963 964
 *	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,
968
 *			     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.
977 978
 *
 * int (*ndo_get_phys_port_id)(struct net_device *dev,
979
 *			       struct netdev_phys_item_id *ppid);
980 981 982
 *	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.
983 984
 *
 * void (*ndo_add_vxlan_port)(struct  net_device *dev,
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 *			      sa_family_t sa_family, __be16 port);
986 987 988 989 990 991
 *	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);
993 994 995
 *	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.
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 *
 * 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.
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 * bool	(*ndo_gso_check) (struct sk_buff *skb,
 *			  struct net_device *dev);
 *	Called by core transmit path to determine if device is capable of
 *	performing GSO on a packet. The device returns true if it is
 *	able to GSO the packet, false otherwise. If the return value is
 *	false the stack will do software GSO.
1021 1022 1023 1024 1025 1026
 *
 * int (*ndo_switch_parent_id_get)(struct net_device *dev,
 *				   struct netdev_phys_item_id *psid);
 *	Called to get an ID of the switch chip this port is part of.
 *	If driver implements this, it indicates that it represents a port
 *	of a switch chip.
1027 1028 1029
 * int (*ndo_switch_port_stp_update)(struct net_device *dev, u8 state);
 *	Called to notify switch device port of bridge port STP
 *	state change.
1030 1031 1032 1033 1034 1035
 */
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);
1036
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
1037 1038
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
1039
						    struct sk_buff *skb,
1040 1041
						    void *accel_priv,
						    select_queue_fallback_t fallback);
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	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);
1052 1053 1054 1055
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
1056 1057
	void			(*ndo_tx_timeout) (struct net_device *dev);

1058 1059
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
1060 1061
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

1062
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
1063
						       __be16 proto, u16 vid);
1064
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1065
						        __be16 proto, u16 vid);
1066 1067
#ifdef CONFIG_NET_POLL_CONTROLLER
	void                    (*ndo_poll_controller)(struct net_device *dev);
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Herbert Xu 已提交
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	int			(*ndo_netpoll_setup)(struct net_device *dev,
1069
						     struct netpoll_info *info);
1070
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
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Eliezer Tamir 已提交
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#endif
1072
#ifdef CONFIG_NET_RX_BUSY_POLL
1073
	int			(*ndo_busy_poll)(struct napi_struct *dev);
1074
#endif
1075 1076 1077 1078
	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);
1079 1080 1081
	int			(*ndo_set_vf_rate)(struct net_device *dev,
						   int vf, int min_tx_rate,
						   int max_tx_rate);
1082 1083
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
1084 1085 1086
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
1087 1088
	int			(*ndo_set_vf_link_state)(struct net_device *dev,
							 int vf, int link_state);
1089 1090 1091 1092 1093
	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);
1094
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
1095
#if IS_ENABLED(CONFIG_FCOE)
1096 1097
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
1098 1099 1100 1101 1102 1103
	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);
1104 1105 1106 1107
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
1108 1109
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
1110 1111
#endif

1112
#if IS_ENABLED(CONFIG_LIBFCOE)
1113 1114 1115 1116
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
1117
#endif
1118

1119 1120 1121 1122 1123 1124
#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
1125 1126 1127 1128
	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);
1129 1130
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
1131
	int			(*ndo_set_features)(struct net_device *dev,
1132
						    netdev_features_t features);
1133
	int			(*ndo_neigh_construct)(struct neighbour *n);
1134
	void			(*ndo_neigh_destroy)(struct neighbour *n);
1135 1136

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1137
					       struct nlattr *tb[],
1138
					       struct net_device *dev,
1139
					       const unsigned char *addr,
1140
					       u16 vid,
1141 1142
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1143
					       struct nlattr *tb[],
1144
					       struct net_device *dev,
1145 1146
					       const unsigned char *addr,
					       u16 vid);
1147 1148 1149
	int			(*ndo_fdb_dump)(struct sk_buff *skb,
						struct netlink_callback *cb,
						struct net_device *dev,
1150
						struct net_device *filter_dev,
1151
						int idx);
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John Fastabend 已提交
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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,
1157 1158
						      struct net_device *dev,
						      u32 filter_mask);
1159 1160
	int			(*ndo_bridge_dellink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
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Jiri Pirko 已提交
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	int			(*ndo_change_carrier)(struct net_device *dev,
						      bool new_carrier);
1163
	int			(*ndo_get_phys_port_id)(struct net_device *dev,
1164
							struct netdev_phys_item_id *ppid);
1165 1166
	void			(*ndo_add_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
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Joseph Gasparakis 已提交
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						      __be16 port);
1168 1169
	void			(*ndo_del_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
J
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						      __be16 port);
1171 1172 1173 1174 1175 1176 1177 1178 1179

	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);
1180
	int			(*ndo_get_lock_subclass)(struct net_device *dev);
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	bool			(*ndo_gso_check) (struct sk_buff *skb,
						  struct net_device *dev);
1183 1184 1185
#ifdef CONFIG_NET_SWITCHDEV
	int			(*ndo_switch_parent_id_get)(struct net_device *dev,
							    struct netdev_phys_item_id *psid);
1186 1187
	int			(*ndo_switch_port_stp_update)(struct net_device *dev,
							      u8 state);
1188
#endif
1189 1190
};

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/**
 * enum net_device_priv_flags - &struct net_device priv_flags
 *
 * These are the &struct net_device, they are only set internally
 * by drivers and used in the kernel. These flags are invisible to
 * userspace, this means that the order of these flags can change
 * during any kernel release.
 *
 * You should have a pretty good reason to be extending these flags.
 *
 * @IFF_802_1Q_VLAN: 802.1Q VLAN device
 * @IFF_EBRIDGE: Ethernet bridging device
 * @IFF_SLAVE_INACTIVE: bonding slave not the curr. active
 * @IFF_MASTER_8023AD: bonding master, 802.3ad
 * @IFF_MASTER_ALB: bonding master, balance-alb
 * @IFF_BONDING: bonding master or slave
 * @IFF_SLAVE_NEEDARP: need ARPs for validation
 * @IFF_ISATAP: ISATAP interface (RFC4214)
 * @IFF_MASTER_ARPMON: bonding master, ARP mon in use
 * @IFF_WAN_HDLC: WAN HDLC device
 * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to
 *	release skb->dst
 * @IFF_DONT_BRIDGE: disallow bridging this ether dev
 * @IFF_DISABLE_NETPOLL: disable netpoll at run-time
 * @IFF_MACVLAN_PORT: device used as macvlan port
 * @IFF_BRIDGE_PORT: device used as bridge port
 * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port
 * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit
 * @IFF_UNICAST_FLT: Supports unicast filtering
 * @IFF_TEAM_PORT: device used as team port
 * @IFF_SUPP_NOFCS: device supports sending custom FCS
 * @IFF_LIVE_ADDR_CHANGE: device supports hardware address
 *	change when it's running
 * @IFF_MACVLAN: Macvlan device
 */
enum netdev_priv_flags {
	IFF_802_1Q_VLAN			= 1<<0,
	IFF_EBRIDGE			= 1<<1,
	IFF_SLAVE_INACTIVE		= 1<<2,
	IFF_MASTER_8023AD		= 1<<3,
	IFF_MASTER_ALB			= 1<<4,
	IFF_BONDING			= 1<<5,
	IFF_SLAVE_NEEDARP		= 1<<6,
	IFF_ISATAP			= 1<<7,
	IFF_MASTER_ARPMON		= 1<<8,
	IFF_WAN_HDLC			= 1<<9,
	IFF_XMIT_DST_RELEASE		= 1<<10,
	IFF_DONT_BRIDGE			= 1<<11,
	IFF_DISABLE_NETPOLL		= 1<<12,
	IFF_MACVLAN_PORT		= 1<<13,
	IFF_BRIDGE_PORT			= 1<<14,
	IFF_OVS_DATAPATH		= 1<<15,
	IFF_TX_SKB_SHARING		= 1<<16,
	IFF_UNICAST_FLT			= 1<<17,
	IFF_TEAM_PORT			= 1<<18,
	IFF_SUPP_NOFCS			= 1<<19,
	IFF_LIVE_ADDR_CHANGE		= 1<<20,
	IFF_MACVLAN			= 1<<21,
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	IFF_XMIT_DST_RELEASE_PERM	= 1<<22,
1250 1251
	IFF_IPVLAN_MASTER		= 1<<23,
	IFF_IPVLAN_SLAVE		= 1<<24,
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};

#define IFF_802_1Q_VLAN			IFF_802_1Q_VLAN
#define IFF_EBRIDGE			IFF_EBRIDGE
#define IFF_SLAVE_INACTIVE		IFF_SLAVE_INACTIVE
#define IFF_MASTER_8023AD		IFF_MASTER_8023AD
#define IFF_MASTER_ALB			IFF_MASTER_ALB
#define IFF_BONDING			IFF_BONDING
#define IFF_SLAVE_NEEDARP		IFF_SLAVE_NEEDARP
#define IFF_ISATAP			IFF_ISATAP
#define IFF_MASTER_ARPMON		IFF_MASTER_ARPMON
#define IFF_WAN_HDLC			IFF_WAN_HDLC
#define IFF_XMIT_DST_RELEASE		IFF_XMIT_DST_RELEASE
#define IFF_DONT_BRIDGE			IFF_DONT_BRIDGE
#define IFF_DISABLE_NETPOLL		IFF_DISABLE_NETPOLL
#define IFF_MACVLAN_PORT		IFF_MACVLAN_PORT
#define IFF_BRIDGE_PORT			IFF_BRIDGE_PORT
#define IFF_OVS_DATAPATH		IFF_OVS_DATAPATH
#define IFF_TX_SKB_SHARING		IFF_TX_SKB_SHARING
#define IFF_UNICAST_FLT			IFF_UNICAST_FLT
#define IFF_TEAM_PORT			IFF_TEAM_PORT
#define IFF_SUPP_NOFCS			IFF_SUPP_NOFCS
#define IFF_LIVE_ADDR_CHANGE		IFF_LIVE_ADDR_CHANGE
#define IFF_MACVLAN			IFF_MACVLAN
1276
#define IFF_XMIT_DST_RELEASE_PERM	IFF_XMIT_DST_RELEASE_PERM
1277 1278
#define IFF_IPVLAN_MASTER		IFF_IPVLAN_MASTER
#define IFF_IPVLAN_SLAVE		IFF_IPVLAN_SLAVE
1279

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/**
 *	struct net_device - The DEVICE structure.
 *		Actually, this whole structure is a big mistake.  It mixes I/O
 *		data with strictly "high-level" data, and it has to know about
 *		almost every data structure used in the INET module.
 *
 *	@name:	This is the first field of the "visible" part of this structure
 *		(i.e. as seen by users in the "Space.c" file).  It is the name
 *	 	of the interface.
 *
 *	@name_hlist: 	Device name hash chain, please keep it close to name[]
 *	@ifalias:	SNMP alias
 *	@mem_end:	Shared memory end
 *	@mem_start:	Shared memory start
 *	@base_addr:	Device I/O address
 *	@irq:		Device IRQ number
 *
 *	@state:		Generic network queuing layer state, see netdev_state_t
 *	@dev_list:	The global list of network devices
 *	@napi_list:	List entry, that is used for polling napi devices
 *	@unreg_list:	List entry, that is used, when we are unregistering the
 *			device, see the function unregister_netdev
 *	@close_list:	List entry, that is used, when we are closing the device
 *
 *	@adj_list:	Directly linked devices, like slaves for bonding
 *	@all_adj_list:	All linked devices, *including* neighbours
 *	@features:	Currently active device features
 *	@hw_features:	User-changeable features
 *
 *	@wanted_features:	User-requested features
 *	@vlan_features:		Mask of features inheritable by VLAN devices
 *
 *	@hw_enc_features:	Mask of features inherited by encapsulating devices
 *				This field indicates what encapsulation
 *				offloads the hardware is capable of doing,
 *				and drivers will need to set them appropriately.
 *
 *	@mpls_features:	Mask of features inheritable by MPLS
 *
 *	@ifindex:	interface index
 *	@iflink:	unique device identifier
 *
 *	@stats:		Statistics struct, which was left as a legacy, use
 *			rtnl_link_stats64 instead
 *
 *	@rx_dropped:	Dropped packets by core network,
 *			do not use this in drivers
 *	@tx_dropped:	Dropped packets by core network,
 *			do not use this in drivers
 *
 *	@carrier_changes:	Stats to monitor carrier on<->off transitions
 *
 *	@wireless_handlers:	List of functions to handle Wireless Extensions,
 *				instead of ioctl,
 *				see <net/iw_handler.h> for details.
 *	@wireless_data:	Instance data managed by the core of wireless extensions
 *
 *	@netdev_ops:	Includes several pointers to callbacks,
 *			if one wants to override the ndo_*() functions
 *	@ethtool_ops:	Management operations
 *	@fwd_ops:	Management operations
 *	@header_ops:	Includes callbacks for creating,parsing,rebuilding,etc
 *			of Layer 2 headers.
 *
 *	@flags:		Interface flags (a la BSD)
 *	@priv_flags:	Like 'flags' but invisible to userspace,
 *			see if.h for the definitions
 *	@gflags:	Global flags ( kept as legacy )
 *	@padded:	How much padding added by alloc_netdev()
 *	@operstate:	RFC2863 operstate
 *	@link_mode:	Mapping policy to operstate
 *	@if_port:	Selectable AUI, TP, ...
 *	@dma:		DMA channel
 *	@mtu:		Interface MTU value
 *	@type:		Interface hardware type
 *	@hard_header_len: Hardware header length
 *
 *	@needed_headroom: Extra headroom the hardware may need, but not in all
 *			  cases can this be guaranteed
 *	@needed_tailroom: Extra tailroom the hardware may need, but not in all
 *			  cases can this be guaranteed. Some cases also use
 *			  LL_MAX_HEADER instead to allocate the skb
 *
 *	interface address info:
 *
 * 	@perm_addr:		Permanent hw address
 * 	@addr_assign_type:	Hw address assignment type
 * 	@addr_len:		Hardware address length
 * 	@neigh_priv_len;	Used in neigh_alloc(),
 * 				initialized only in atm/clip.c
 * 	@dev_id:		Used to differentiate devices that share
 * 				the same link layer address
 * 	@dev_port:		Used to differentiate devices that share
 * 				the same function
 *	@addr_list_lock:	XXX: need comments on this one
 *	@uc:			unicast mac addresses
 *	@mc:			multicast mac addresses
 *	@dev_addrs:		list of device hw addresses
 *	@queues_kset:		Group of all Kobjects in the Tx and RX queues
 *	@uc_promisc:		Counter, that indicates, that promiscuous mode
 *				has been enabled due to the need to listen to
 *				additional unicast addresses in a device that
 *				does not implement ndo_set_rx_mode()
 *	@promiscuity:		Number of times, the NIC is told to work in
 *				Promiscuous mode, if it becomes 0 the NIC will
 *				exit from working in Promiscuous mode
 *	@allmulti:		Counter, enables or disables allmulticast mode
 *
 *	@vlan_info:	VLAN info
 *	@dsa_ptr:	dsa specific data
 *	@tipc_ptr:	TIPC specific data
 *	@atalk_ptr:	AppleTalk link
 *	@ip_ptr:	IPv4 specific data
 *	@dn_ptr:	DECnet specific data
 *	@ip6_ptr:	IPv6 specific data
 *	@ax25_ptr:	AX.25 specific data
 *	@ieee80211_ptr:	IEEE 802.11 specific data, assign before registering
 *
 *	@last_rx:	Time of last Rx
 *	@dev_addr:	Hw address (before bcast,
 *			because most packets are unicast)
 *
 *	@_rx:			Array of RX queues
 *	@num_rx_queues:		Number of RX queues
 *				allocated at register_netdev() time
 *	@real_num_rx_queues: 	Number of RX queues currently active in device
 *
 *	@rx_handler:		handler for received packets
 *	@rx_handler_data: 	XXX: need comments on this one
 *	@ingress_queue:		XXX: need comments on this one
 *	@broadcast:		hw bcast address
 *
 *	@_tx:			Array of TX queues
 *	@num_tx_queues:		Number of TX queues allocated at alloc_netdev_mq() time
 *	@real_num_tx_queues: 	Number of TX queues currently active in device
 *	@qdisc:			Root qdisc from userspace point of view
 *	@tx_queue_len:		Max frames per queue allowed
 *	@tx_global_lock: 	XXX: need comments on this one
 *
 *	@xps_maps:	XXX: need comments on this one
 *
 *	@rx_cpu_rmap:	CPU reverse-mapping for RX completion interrupts,
 *			indexed by RX queue number. Assigned by driver.
 *			This must only be set if the ndo_rx_flow_steer
 *			operation is defined
 *
 *	@trans_start:		Time (in jiffies) of last Tx
 *	@watchdog_timeo:	Represents the timeout that is used by
 *				the watchdog ( see dev_watchdog() )
 *	@watchdog_timer:	List of timers
 *
 *	@pcpu_refcnt:		Number of references to this device
 *	@todo_list:		Delayed register/unregister
 *	@index_hlist:		Device index hash chain
 *	@link_watch_list:	XXX: need comments on this one
 *
 *	@reg_state:		Register/unregister state machine
 *	@dismantle:		Device is going to be freed
 *	@rtnl_link_state:	This enum represents the phases of creating
 *				a new link
 *
 *	@destructor:		Called from unregister,
 *				can be used to call free_netdev
 *	@npinfo:		XXX: need comments on this one
 * 	@nd_net:		Network namespace this network device is inside
 *
 * 	@ml_priv:	Mid-layer private
 * 	@lstats:	Loopback statistics
 * 	@tstats:	Tunnel statistics
 * 	@dstats:	Dummy statistics
 * 	@vstats:	Virtual ethernet statistics
 *
 *	@garp_port:	GARP
 *	@mrp_port:	MRP
 *
 *	@dev:		Class/net/name entry
 *	@sysfs_groups:	Space for optional device, statistics and wireless
 *			sysfs groups
 *
 *	@sysfs_rx_queue_group:	Space for optional per-rx queue attributes
 *	@rtnl_link_ops:	Rtnl_link_ops
 *
 *	@gso_max_size:	Maximum size of generic segmentation offload
 *	@gso_max_segs:	Maximum number of segments that can be passed to the
 *			NIC for GSO
1465 1466
 *	@gso_min_segs:	Minimum number of segments that can be passed to the
 *			NIC for GSO
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
 *
 *	@dcbnl_ops:	Data Center Bridging netlink ops
 *	@num_tc:	Number of traffic classes in the net device
 *	@tc_to_txq:	XXX: need comments on this one
 *	@prio_tc_map	XXX: need comments on this one
 *
 *	@fcoe_ddp_xid:	Max exchange id for FCoE LRO by ddp
 *
 *	@priomap:	XXX: need comments on this one
 *	@phydev:	Physical device may attach itself
 *			for hardware timestamping
 *
 *	@qdisc_tx_busylock:	XXX: need comments on this one
 *
 *	@group:		The group, that the device belongs to
 *	@pm_qos_req:	Power Management QoS object
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 *
 *	FIXME: cleanup struct net_device such that network protocol info
 *	moves out.
 */

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struct net_device {
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	char			name[IFNAMSIZ];
1490
	struct hlist_node	name_hlist;
1491
	char 			*ifalias;
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	/*
	 *	I/O specific fields
	 *	FIXME: Merge these and struct ifmap into one
	 */
1496 1497 1498 1499
	unsigned long		mem_end;
	unsigned long		mem_start;
	unsigned long		base_addr;
	int			irq;
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	/*
1502 1503
	 *	Some hardware also needs these fields (state,dev_list,
	 *	napi_list,unreg_list,close_list) but they are not
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	 *	part of the usual set specified in Space.c.
	 */

	unsigned long		state;

1509
	struct list_head	dev_list;
1510
	struct list_head	napi_list;
1511
	struct list_head	unreg_list;
1512
	struct list_head	close_list;
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522

	struct {
		struct list_head upper;
		struct list_head lower;
	} adj_list;

	struct {
		struct list_head upper;
		struct list_head lower;
	} all_adj_list;
1523

1524 1525 1526 1527
	netdev_features_t	features;
	netdev_features_t	hw_features;
	netdev_features_t	wanted_features;
	netdev_features_t	vlan_features;
1528
	netdev_features_t	hw_enc_features;
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	netdev_features_t	mpls_features;
1530

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	int			ifindex;
	int			iflink;

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1534
	struct net_device_stats	stats;
1535 1536 1537

	atomic_long_t		rx_dropped;
	atomic_long_t		tx_dropped;
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1539 1540
	atomic_t		carrier_changes;

1541
#ifdef CONFIG_WIRELESS_EXT
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1542 1543
	const struct iw_handler_def *	wireless_handlers;
	struct iw_public_data *	wireless_data;
1544
#endif
1545
	const struct net_device_ops *netdev_ops;
1546
	const struct ethtool_ops *ethtool_ops;
1547
	const struct forwarding_accel_ops *fwd_ops;
L
Linus Torvalds 已提交
1548

1549 1550
	const struct header_ops *header_ops;

1551 1552 1553
	unsigned int		flags;
	unsigned int		priv_flags;

L
Linus Torvalds 已提交
1554
	unsigned short		gflags;
1555
	unsigned short		padded;
L
Linus Torvalds 已提交
1556

1557 1558
	unsigned char		operstate;
	unsigned char		link_mode;
S
Stefan Rompf 已提交
1559

1560 1561
	unsigned char		if_port;
	unsigned char		dma;
1562

1563 1564 1565
	unsigned int		mtu;
	unsigned short		type;
	unsigned short		hard_header_len;
L
Linus Torvalds 已提交
1566

1567 1568 1569
	unsigned short		needed_headroom;
	unsigned short		needed_tailroom;

L
Linus Torvalds 已提交
1570
	/* Interface address info. */
1571 1572 1573
	unsigned char		perm_addr[MAX_ADDR_LEN];
	unsigned char		addr_assign_type;
	unsigned char		addr_len;
1574
	unsigned short		neigh_priv_len;
1575 1576
	unsigned short          dev_id;
	unsigned short          dev_port;
J
Jiri Pirko 已提交
1577
	spinlock_t		addr_list_lock;
1578 1579 1580 1581
	struct netdev_hw_addr_list	uc;
	struct netdev_hw_addr_list	mc;
	struct netdev_hw_addr_list	dev_addrs;

1582 1583 1584 1585
#ifdef CONFIG_SYSFS
	struct kset		*queues_kset;
#endif

1586 1587
	unsigned char		name_assign_type;

1588
	bool			uc_promisc;
1589 1590
	unsigned int		promiscuity;
	unsigned int		allmulti;
L
Linus Torvalds 已提交
1591 1592 1593


	/* Protocol specific pointers */
1594

1595
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1596
	struct vlan_info __rcu	*vlan_info;
1597
#endif
1598
#if IS_ENABLED(CONFIG_NET_DSA)
1599
	struct dsa_switch_tree	*dsa_ptr;
1600 1601
#endif
#if IS_ENABLED(CONFIG_TIPC)
1602
	struct tipc_bearer __rcu *tipc_ptr;
1603
#endif
1604 1605 1606 1607 1608 1609
	void 			*atalk_ptr;
	struct in_device __rcu	*ip_ptr;
	struct dn_dev __rcu     *dn_ptr;
	struct inet6_dev __rcu	*ip6_ptr;
	void			*ax25_ptr;
	struct wireless_dev	*ieee80211_ptr;
1610
	struct wpan_dev		*ieee802154_ptr;
L
Linus Torvalds 已提交
1611

1612
/*
E
Eric Dumazet 已提交
1613
 * Cache lines mostly used on receive path (including eth_type_trans())
1614
 */
1615
	unsigned long		last_rx;
1616

1617
	/* Interface address info used in eth_type_trans() */
1618
	unsigned char		*dev_addr;
1619

T
Tom Herbert 已提交
1620

1621
#ifdef CONFIG_SYSFS
T
Tom Herbert 已提交
1622 1623 1624
	struct netdev_rx_queue	*_rx;

	unsigned int		num_rx_queues;
1625
	unsigned int		real_num_rx_queues;
1626

E
Eric Dumazet 已提交
1627
#endif
T
Tom Herbert 已提交
1628

1629
	unsigned long		gro_flush_timeout;
1630 1631
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1632

1633
	struct netdev_queue __rcu *ingress_queue;
1634
	unsigned char		broadcast[MAX_ADDR_LEN];
1635

E
Eric Dumazet 已提交
1636 1637 1638 1639

/*
 * Cache lines mostly used on transmit path
 */
1640 1641
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
	unsigned int		num_tx_queues;
1642
	unsigned int		real_num_tx_queues;
1643
	struct Qdisc		*qdisc;
1644
	unsigned long		tx_queue_len;
1645
	spinlock_t		tx_global_lock;
E
Eric Dumazet 已提交
1646

T
Tom Herbert 已提交
1647
#ifdef CONFIG_XPS
E
Eric Dumazet 已提交
1648
	struct xps_dev_maps __rcu *xps_maps;
T
Tom Herbert 已提交
1649
#endif
1650 1651 1652
#ifdef CONFIG_RFS_ACCEL
	struct cpu_rmap		*rx_cpu_rmap;
#endif
T
Tom Herbert 已提交
1653

1654
	/* These may be needed for future network-power-down code. */
1655 1656 1657 1658 1659

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1660
	unsigned long		trans_start;
1661

1662
	int			watchdog_timeo;
1663 1664
	struct timer_list	watchdog_timer;

E
Eric Dumazet 已提交
1665
	int __percpu		*pcpu_refcnt;
L
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1666 1667
	struct list_head	todo_list;

1668
	struct hlist_node	index_hlist;
1669
	struct list_head	link_watch_list;
1670

L
Linus Torvalds 已提交
1671
	enum { NETREG_UNINITIALIZED=0,
1672
	       NETREG_REGISTERED,	/* completed register_netdevice */
L
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1673 1674 1675
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1676
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1677 1678
	} reg_state:8;

1679
	bool dismantle;
1680 1681 1682 1683 1684

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
L
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1685

1686
	void (*destructor)(struct net_device *dev);
L
Linus Torvalds 已提交
1687 1688

#ifdef CONFIG_NETPOLL
1689
	struct netpoll_info __rcu	*npinfo;
L
Linus Torvalds 已提交
1690
#endif
1691

1692
#ifdef CONFIG_NET_NS
1693
	struct net		*nd_net;
1694
#endif
1695

D
David S. Miller 已提交
1696
	/* mid-layer private */
E
Eric Dumazet 已提交
1697
	union {
1698 1699
		void					*ml_priv;
		struct pcpu_lstats __percpu		*lstats;
1700
		struct pcpu_sw_netstats __percpu	*tstats;
1701 1702
		struct pcpu_dstats __percpu		*dstats;
		struct pcpu_vstats __percpu		*vstats;
E
Eric Dumazet 已提交
1703
	};
1704

E
Eric Dumazet 已提交
1705
	struct garp_port __rcu	*garp_port;
1706
	struct mrp_port __rcu	*mrp_port;
L
Linus Torvalds 已提交
1707

1708
	struct device	dev;
1709
	const struct attribute_group *sysfs_groups[4];
1710
	const struct attribute_group *sysfs_rx_queue_group;
P
Patrick McHardy 已提交
1711 1712

	const struct rtnl_link_ops *rtnl_link_ops;
1713

1714 1715 1716
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1717 1718
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1719
	u16			gso_min_segs;
J
Jeff Kirsher 已提交
1720
#ifdef CONFIG_DCB
1721
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1722
#endif
1723 1724 1725
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1726

1727
#if IS_ENABLED(CONFIG_FCOE)
1728
	unsigned int		fcoe_ddp_xid;
1729
#endif
1730
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1731
	struct netprio_map __rcu *priomap;
1732
#endif
1733
	struct phy_device *phydev;
1734
	struct lock_class_key *qdisc_tx_busylock;
1735
	int group;
1736
	struct pm_qos_request	pm_qos_req;
L
Linus Torvalds 已提交
1737
};
1738
#define to_net_dev(d) container_of(d, struct net_device, dev)
L
Linus Torvalds 已提交
1739 1740 1741

#define	NETDEV_ALIGN		32

1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
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;
}

1793 1794 1795 1796 1797 1798 1799
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
					 unsigned int index)
{
	return &dev->_tx[index];
}

1800 1801 1802 1803 1804 1805
static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
						    const struct sk_buff *skb)
{
	return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
}

1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817
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);
}

1818
struct netdev_queue *netdev_pick_tx(struct net_device *dev,
1819 1820
				    struct sk_buff *skb,
				    void *accel_priv);
1821

1822 1823 1824 1825 1826 1827
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
Eric Dumazet 已提交
1828
	return read_pnet(&dev->nd_net);
1829 1830 1831
}

static inline
1832
void dev_net_set(struct net_device *dev, struct net *net)
1833 1834
{
#ifdef CONFIG_NET_NS
1835 1836
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1837 1838 1839
#endif
}

1840
static inline bool netdev_uses_dsa(struct net_device *dev)
1841
{
1842
#if IS_ENABLED(CONFIG_NET_DSA)
1843 1844
	if (dev->dsa_ptr != NULL)
		return dsa_uses_tagged_protocol(dev->dsa_ptr);
1845
#endif
1846
	return false;
1847 1848
}

1849 1850 1851 1852 1853 1854
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1855
static inline void *netdev_priv(const struct net_device *dev)
L
Linus Torvalds 已提交
1856
{
1857
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
L
Linus Torvalds 已提交
1858 1859 1860 1861 1862
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1863
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
L
Linus Torvalds 已提交
1864

1865
/* Set the sysfs device type for the network logical device to allow
1866
 * fine-grained identification of different network device types. For
1867 1868 1869 1870
 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

E
Eric Dumazet 已提交
1871 1872 1873 1874 1875
/* Default NAPI poll() weight
 * Device drivers are strongly advised to not use bigger value
 */
#define NAPI_POLL_WEIGHT 64

1876 1877 1878 1879 1880 1881 1882 1883 1884 1885
/**
 *	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.
 */
1886 1887
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1888

1889 1890 1891 1892 1893 1894
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1895 1896 1897
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1898 1899 1900
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1901 1902 1903
	/* Length of frag0. */
	unsigned int frag0_len;

1904 1905 1906
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1907
	/* This is non-zero if the packet cannot be merged with the new skb. */
1908 1909 1910 1911
	u16	flush;

	/* Save the IP ID here and check when we get to the transport layer */
	u16	flush_id;
1912 1913

	/* Number of segments aggregated. */
1914 1915 1916 1917
	u16	count;

	/* This is non-zero if the packet may be of the same flow. */
	u8	same_flow;
H
Herbert Xu 已提交
1918 1919

	/* Free the skb? */
1920
	u8	free;
1921 1922
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2
1923 1924 1925

	/* jiffies when first packet was created/queued */
	unsigned long age;
1926

T
Tom Herbert 已提交
1927
	/* Used in ipv6_gro_receive() and foo-over-udp */
1928 1929 1930
	u16	proto;

	/* Used in udp_gro_receive */
T
Tom Herbert 已提交
1931 1932 1933 1934 1935
	u8	udp_mark:1;

	/* GRO checksum is valid */
	u8	csum_valid:1;

1936 1937
	/* Number of checksums via CHECKSUM_UNNECESSARY */
	u8	csum_cnt:3;
1938

1939 1940 1941
	/* Used in foo-over-udp, set in udp[46]_gro_receive */
	u8	is_ipv6:1;

1942 1943 1944
	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
	__wsum	csum;

1945 1946
	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
1947 1948 1949
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1950

L
Linus Torvalds 已提交
1951
struct packet_type {
D
David S. Miller 已提交
1952 1953 1954 1955 1956 1957
	__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 *);
1958 1959
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
L
Linus Torvalds 已提交
1960 1961 1962 1963
	void			*af_packet_priv;
	struct list_head	list;
};

1964
struct offload_callbacks {
1965
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
1966
						netdev_features_t features);
1967 1968
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
1969
	int			(*gro_complete)(struct sk_buff *skb, int nhoff);
1970 1971 1972 1973 1974 1975
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
	struct offload_callbacks callbacks;
	struct list_head	 list;
L
Linus Torvalds 已提交
1976 1977
};

1978 1979
struct udp_offload {
	__be16			 port;
T
Tom Herbert 已提交
1980
	u8			 ipproto;
1981 1982 1983
	struct offload_callbacks callbacks;
};

1984 1985 1986 1987 1988 1989 1990 1991 1992
/* 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;
};

1993 1994
#define netdev_alloc_pcpu_stats(type)				\
({								\
1995
	typeof(type) __percpu *pcpu_stats = alloc_percpu(type); \
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
	if (pcpu_stats)	{					\
		int i;						\
		for_each_possible_cpu(i) {			\
			typeof(type) *stat;			\
			stat = per_cpu_ptr(pcpu_stats, i);	\
			u64_stats_init(&stat->syncp);		\
		}						\
	}							\
	pcpu_stats;						\
})

L
Linus Torvalds 已提交
2007 2008
#include <linux/notifier.h>

2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
/* 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
2022
#define NETDEV_CHANGEMTU	0x0007 /* notify after mtu change happened */
2023 2024 2025 2026 2027 2028 2029 2030 2031
#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
2032
#define NETDEV_UNREGISTER_FINAL 0x0011
2033 2034 2035
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014
2036
#define NETDEV_CHANGEUPPER	0x0015
2037
#define NETDEV_RESEND_IGMP	0x0016
2038
#define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
2039
#define NETDEV_CHANGEINFODATA	0x0018
2040

2041 2042
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);
2043 2044 2045 2046 2047

struct netdev_notifier_info {
	struct net_device *dev;
};

2048 2049 2050 2051 2052
struct netdev_notifier_change_info {
	struct netdev_notifier_info info; /* must be first */
	unsigned int flags_changed;
};

2053 2054 2055 2056 2057 2058
static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
					     struct net_device *dev)
{
	info->dev = dev;
}

2059 2060 2061 2062 2063 2064
static inline struct net_device *
netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
{
	return info->dev;
}

2065
int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
2066 2067


L
Linus Torvalds 已提交
2068 2069
extern rwlock_t				dev_base_lock;		/* Device list lock */

2070 2071
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
2072 2073
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
2074 2075
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
2076 2077 2078 2079
#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)
2080 2081
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
2082 2083 2084
#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)
2085
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
2086

2087 2088 2089 2090 2091
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

2092
	net = dev_net(dev);
2093 2094 2095 2096
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2097 2098 2099 2100 2101 2102
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
2103
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
2104 2105 2106
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2107 2108 2109 2110 2111
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);
}
2112

E
Eric Dumazet 已提交
2113 2114 2115 2116 2117 2118 2119
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);
}

2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131
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);

2132 2133
struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
				      unsigned short mask);
2134 2135 2136 2137 2138 2139 2140 2141 2142
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);
2143
int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
2144 2145 2146
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);
2147 2148 2149 2150 2151
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

2152 2153
int netdev_refcnt_read(const struct net_device *dev);
void free_netdev(struct net_device *dev);
2154
void netdev_freemem(struct net_device *dev);
2155 2156
void synchronize_net(void);
int init_dummy_netdev(struct net_device *dev);
2157

2158 2159 2160 2161 2162 2163
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);
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179

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;
}

2180 2181
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
2182
{
2183 2184
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
2185

2186 2187 2188 2189
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
2190

2191 2192 2193
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
2194 2195 2196
	if (!pskb_may_pull(skb, hlen))
		return NULL;

2197 2198
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
2199
	return skb->data + offset;
2200
}
L
Linus Torvalds 已提交
2201

H
Herbert Xu 已提交
2202 2203
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
2204 2205
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
2206 2207
}

2208 2209 2210
static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
					const void *start, unsigned int len)
{
T
Tom Herbert 已提交
2211
	if (NAPI_GRO_CB(skb)->csum_valid)
2212 2213 2214 2215
		NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
						  csum_partial(start, len, 0));
}

T
Tom Herbert 已提交
2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227
/* GRO checksum functions. These are logical equivalents of the normal
 * checksum functions (in skbuff.h) except that they operate on the GRO
 * offsets and fields in sk_buff.
 */

__sum16 __skb_gro_checksum_complete(struct sk_buff *skb);

static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
						      bool zero_okay,
						      __sum16 check)
{
	return (skb->ip_summed != CHECKSUM_PARTIAL &&
2228
		NAPI_GRO_CB(skb)->csum_cnt == 0 &&
T
Tom Herbert 已提交
2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245
		(!zero_okay || check));
}

static inline __sum16 __skb_gro_checksum_validate_complete(struct sk_buff *skb,
							   __wsum psum)
{
	if (NAPI_GRO_CB(skb)->csum_valid &&
	    !csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum)))
		return 0;

	NAPI_GRO_CB(skb)->csum = psum;

	return __skb_gro_checksum_complete(skb);
}

static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb)
{
2246 2247 2248 2249 2250 2251 2252 2253 2254
	if (NAPI_GRO_CB(skb)->csum_cnt > 0) {
		/* Consume a checksum from CHECKSUM_UNNECESSARY */
		NAPI_GRO_CB(skb)->csum_cnt--;
	} else {
		/* Update skb for CHECKSUM_UNNECESSARY and csum_level when we
		 * verified a new top level checksum or an encapsulated one
		 * during GRO. This saves work if we fallback to normal path.
		 */
		__skb_incr_checksum_unnecessary(skb);
T
Tom Herbert 已提交
2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
	}
}

#define __skb_gro_checksum_validate(skb, proto, zero_okay, check,	\
				    compute_pseudo)			\
({									\
	__sum16 __ret = 0;						\
	if (__skb_gro_checksum_validate_needed(skb, zero_okay, check))	\
		__ret = __skb_gro_checksum_validate_complete(skb,	\
				compute_pseudo(skb, proto));		\
2265 2266 2267
	if (__ret)							\
		__skb_mark_checksum_bad(skb);				\
	else								\
T
Tom Herbert 已提交
2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281
		skb_gro_incr_csum_unnecessary(skb);			\
	__ret;								\
})

#define skb_gro_checksum_validate(skb, proto, compute_pseudo)		\
	__skb_gro_checksum_validate(skb, proto, false, 0, compute_pseudo)

#define skb_gro_checksum_validate_zero_check(skb, proto, check,		\
					     compute_pseudo)		\
	__skb_gro_checksum_validate(skb, proto, true, check, compute_pseudo)

#define skb_gro_checksum_simple_validate(skb)				\
	__skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo)

2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301
static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb)
{
	return (NAPI_GRO_CB(skb)->csum_cnt == 0 &&
		!NAPI_GRO_CB(skb)->csum_valid);
}

static inline void __skb_gro_checksum_convert(struct sk_buff *skb,
					      __sum16 check, __wsum pseudo)
{
	NAPI_GRO_CB(skb)->csum = ~pseudo;
	NAPI_GRO_CB(skb)->csum_valid = 1;
}

#define skb_gro_checksum_try_convert(skb, proto, check, compute_pseudo)	\
do {									\
	if (__skb_gro_checksum_convert_check(skb))			\
		__skb_gro_checksum_convert(skb, check,			\
					   compute_pseudo(skb, proto));	\
} while (0)

2302 2303
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
2304
				  const void *daddr, const void *saddr,
2305
				  unsigned int len)
2306
{
2307
	if (!dev->header_ops || !dev->header_ops->create)
2308
		return 0;
2309 2310

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
2311 2312
}

S
Stephen Hemminger 已提交
2313 2314 2315 2316 2317
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

2318
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
2319
		return 0;
2320
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
2321 2322
}

2323 2324 2325 2326 2327 2328 2329 2330 2331
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
2332
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
2333
int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
L
Linus Torvalds 已提交
2334 2335 2336 2337 2338
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

2339
#ifdef CONFIG_NET_FLOW_LIMIT
2340
#define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351
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
2352
/*
E
Eric Dumazet 已提交
2353
 * Incoming packets are placed on per-cpu queues
L
Linus Torvalds 已提交
2354
 */
E
Eric Dumazet 已提交
2355
struct softnet_data {
L
Linus Torvalds 已提交
2356
	struct list_head	poll_list;
2357
	struct sk_buff_head	process_queue;
L
Linus Torvalds 已提交
2358

C
Changli Gao 已提交
2359
	/* stats */
2360 2361 2362 2363
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
2364
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
2365
	struct softnet_data	*rps_ipi_list;
E
Eric Dumazet 已提交
2366 2367 2368 2369 2370 2371 2372
#endif
#ifdef CONFIG_NET_FLOW_LIMIT
	struct sd_flow_limit __rcu *flow_limit;
#endif
	struct Qdisc		*output_queue;
	struct Qdisc		**output_queue_tailp;
	struct sk_buff		*completion_queue;
E
Eric Dumazet 已提交
2373

E
Eric Dumazet 已提交
2374
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
2375
	/* Elements below can be accessed between CPUs for RPS */
T
Tom Herbert 已提交
2376
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
2377 2378
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
Tom Herbert 已提交
2379
	unsigned int		input_queue_head;
2380
	unsigned int		input_queue_tail;
2381
#endif
2382
	unsigned int		dropped;
T
Tom Herbert 已提交
2383
	struct sk_buff_head	input_pkt_queue;
2384
	struct napi_struct	backlog;
2385

L
Linus Torvalds 已提交
2386 2387
};

2388
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
2389 2390
{
#ifdef CONFIG_RPS
2391 2392 2393 2394 2395 2396 2397 2398 2399
	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
2400 2401 2402
#endif
}

T
Tom Herbert 已提交
2403
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
2404

2405
void __netif_schedule(struct Qdisc *q);
2406
void netif_schedule_queue(struct netdev_queue *txq);
2407

2408 2409 2410 2411 2412 2413 2414 2415
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));
}

2416 2417
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
2418
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2419 2420
}

2421 2422 2423 2424 2425 2426
/**
 *	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
2427 2428
static inline void netif_start_queue(struct net_device *dev)
{
2429
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2430 2431
}

2432 2433 2434 2435 2436 2437 2438 2439 2440 2441
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);
	}
}

2442
void netif_tx_wake_queue(struct netdev_queue *dev_queue);
2443

2444 2445 2446 2447 2448 2449 2450
/**
 *	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.
 */
2451 2452
static inline void netif_wake_queue(struct net_device *dev)
{
2453
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2454 2455
}

2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
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);
	}
}

2466 2467
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
2468
	if (WARN_ON(!dev_queue)) {
2469
		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
2470 2471
		return;
	}
2472
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2473 2474
}

2475 2476 2477 2478 2479 2480 2481
/**
 *	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
2482 2483
static inline void netif_stop_queue(struct net_device *dev)
{
2484
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2485 2486
}

2487 2488 2489 2490 2491 2492 2493 2494 2495 2496
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);
	}
}

2497
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2498
{
2499
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2500 2501
}

2502 2503 2504 2505 2506 2507
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
2508
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
2509
{
2510
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2511 2512
}

2513
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2514
{
2515 2516 2517
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

2518 2519
static inline bool
netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2520 2521 2522 2523
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

2524 2525 2526 2527 2528 2529
static inline bool
netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue)
{
	return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN;
}

2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557
/**
 *	netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write
 *	@dev_queue: pointer to transmit queue
 *
 * BQL enabled drivers might use this helper in their ndo_start_xmit(),
 * to give appropriate hint to the cpu.
 */
static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue)
{
#ifdef CONFIG_BQL
	prefetchw(&dev_queue->dql.num_queued);
#endif
}

/**
 *	netdev_txq_bql_complete_prefetchw - prefetch bql data for write
 *	@dev_queue: pointer to transmit queue
 *
 * BQL enabled drivers might use this helper in their TX completion path,
 * to give appropriate hint to the cpu.
 */
static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
{
#ifdef CONFIG_BQL
	prefetchw(&dev_queue->dql.limit);
#endif
}

2558 2559 2560
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
2561 2562
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578

	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
2579
#endif
2580 2581
}

2582 2583 2584 2585 2586 2587 2588 2589 2590
/**
 * 	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
 */
2591 2592 2593 2594 2595 2596
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,
2597
					     unsigned int pkts, unsigned int bytes)
2598
{
T
Tom Herbert 已提交
2599
#ifdef CONFIG_BQL
2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
	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
2617
#endif
2618 2619
}

2620 2621 2622 2623 2624 2625 2626 2627 2628 2629
/**
 * 	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()
 */
2630
static inline void netdev_completed_queue(struct net_device *dev,
2631
					  unsigned int pkts, unsigned int bytes)
2632 2633 2634 2635 2636 2637
{
	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
2638
#ifdef CONFIG_BQL
2639
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
2640 2641
	dql_reset(&q->dql);
#endif
2642 2643
}

2644 2645 2646 2647 2648 2649 2650
/**
 * 	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
 */
2651 2652 2653
static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2654 2655
}

2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675
/**
 * 	netdev_cap_txqueue - check if selected tx queue exceeds device queues
 * 	@dev: network device
 * 	@queue_index: given tx queue index
 *
 * 	Returns 0 if given tx queue index >= number of device tx queues,
 * 	otherwise returns the originally passed tx queue index.
 */
static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index)
{
	if (unlikely(queue_index >= dev->real_num_tx_queues)) {
		net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
				     dev->name, queue_index,
				     dev->real_num_tx_queues);
		return 0;
	}

	return queue_index;
}

2676 2677 2678 2679 2680 2681
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
2682
static inline bool netif_running(const struct net_device *dev)
L
Linus Torvalds 已提交
2683 2684 2685 2686
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

2687 2688 2689 2690 2691 2692
/*
 * 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.
 */
2693 2694 2695 2696 2697 2698 2699 2700

/**
 *	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.
 */
2701 2702
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
2703
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2704 2705

	netif_tx_start_queue(txq);
2706 2707
}

2708 2709 2710 2711 2712 2713 2714
/**
 *	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.
 */
2715 2716
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
2717
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2718
	netif_tx_stop_queue(txq);
2719 2720
}

2721 2722 2723 2724 2725 2726 2727
/**
 *	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.
 */
2728 2729
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
2730
{
2731
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2732 2733

	return netif_tx_queue_stopped(txq);
2734 2735
}

2736 2737
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
2738 2739 2740
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
2741

2742
void netif_wake_subqueue(struct net_device *dev, u16 queue_index);
2743

2744
#ifdef CONFIG_XPS
2745
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2746
			u16 index);
2747 2748
#else
static inline int netif_set_xps_queue(struct net_device *dev,
2749
				      const struct cpumask *mask,
2750 2751 2752 2753 2754 2755
				      u16 index)
{
	return 0;
}
#endif

2756 2757 2758 2759 2760
/*
 * 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,
2761
			      struct sk_buff *skb)
2762 2763 2764 2765
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

2766 2767 2768 2769 2770 2771
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
2772
static inline bool netif_is_multiqueue(const struct net_device *dev)
2773
{
E
Eric Dumazet 已提交
2774
	return dev->num_tx_queues > 1;
2775
}
L
Linus Torvalds 已提交
2776

2777
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
2778

2779
#ifdef CONFIG_SYSFS
2780
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
2781 2782 2783 2784 2785 2786 2787 2788
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800
#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

2801
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
2802
int netif_get_num_default_rss_queues(void);
2803

2804 2805 2806 2807 2808 2809 2810
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
2811

2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829
/*
 * 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
2830
 */
2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849
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
2850

2851 2852 2853 2854 2855 2856 2857
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);
2858 2859
struct packet_offload *gro_find_receive_by_type(__be16 type);
struct packet_offload *gro_find_complete_by_type(__be16 type);
2860 2861 2862 2863 2864 2865 2866

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

2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877
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);
2878 2879
void __dev_notify_flags(struct net_device *, unsigned int old_flags,
			unsigned int gchanges);
2880 2881 2882 2883 2884 2885 2886 2887
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,
2888
			 struct netdev_phys_item_id *ppid);
2889
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev);
2890 2891
struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
				    struct netdev_queue *txq, int *ret);
H
Herbert Xu 已提交
2892
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
2893
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
2894
bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb);
L
Linus Torvalds 已提交
2895

2896
extern int		netdev_budget;
L
Linus Torvalds 已提交
2897 2898

/* Called by rtnetlink.c:rtnl_unlock() */
2899
void netdev_run_todo(void);
L
Linus Torvalds 已提交
2900

2901 2902 2903 2904
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
2905
 * Release reference to device to allow it to be freed.
2906
 */
L
Linus Torvalds 已提交
2907 2908
static inline void dev_put(struct net_device *dev)
{
2909
	this_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
2910 2911
}

2912 2913 2914 2915
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
2916
 * Hold reference to device to keep it from being freed.
2917
 */
2918 2919
static inline void dev_hold(struct net_device *dev)
{
2920
	this_cpu_inc(*dev->pcpu_refcnt);
2921
}
L
Linus Torvalds 已提交
2922 2923 2924 2925

/* 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
2926 2927 2928 2929
 *
 * 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
2930 2931
 */

2932 2933 2934
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
2935

2936 2937 2938 2939 2940 2941
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2942
static inline bool netif_carrier_ok(const struct net_device *dev)
L
Linus Torvalds 已提交
2943 2944 2945 2946
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

2947
unsigned long dev_trans_start(struct net_device *dev);
2948

2949
void __netdev_watchdog_up(struct net_device *dev);
L
Linus Torvalds 已提交
2950

2951
void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
2952

2953
void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
2954

2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967
/**
 *	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
2968 2969 2970 2971 2972 2973
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2974 2975 2976 2977 2978 2979
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
2980 2981 2982 2983 2984 2985
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2986 2987 2988 2989 2990 2991
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2992
static inline bool netif_dormant(const struct net_device *dev)
S
Stefan Rompf 已提交
2993 2994 2995 2996 2997
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2998 2999 3000 3001 3002 3003
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
3004
static inline bool netif_oper_up(const struct net_device *dev)
E
Eric Dumazet 已提交
3005
{
S
Stefan Rompf 已提交
3006 3007 3008 3009
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

3010 3011 3012 3013 3014 3015
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
3016
static inline bool netif_device_present(struct net_device *dev)
L
Linus Torvalds 已提交
3017 3018 3019 3020
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

3021
void netif_device_detach(struct net_device *dev);
L
Linus Torvalds 已提交
3022

3023
void netif_device_attach(struct net_device *dev);
L
Linus Torvalds 已提交
3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073

/*
 * 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;
}

3074
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
3075
{
3076 3077
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
3078 3079
}

3080 3081 3082 3083 3084 3085
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

3086
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
3087
{
3088
	bool ok = spin_trylock(&txq->_xmit_lock);
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105
	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
3106 3107 3108 3109 3110 3111
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

3112 3113 3114 3115 3116 3117
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
3118 3119
static inline void netif_tx_lock(struct net_device *dev)
{
3120
	unsigned int i;
3121
	int cpu;
3122

3123 3124
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
3125 3126
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3127 3128 3129 3130 3131 3132 3133

		/* 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.
		 */
3134
		__netif_tx_lock(txq, cpu);
3135 3136
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
3137
	}
H
Herbert Xu 已提交
3138 3139 3140 3141
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
3142 3143
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
3144 3145 3146 3147
}

static inline void netif_tx_unlock(struct net_device *dev)
{
3148 3149 3150 3151
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3152

3153 3154 3155 3156 3157
		/* 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);
3158
		netif_schedule_queue(txq);
3159 3160
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
3161 3162 3163 3164
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
3165 3166
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
3167 3168
}

3169
#define HARD_TX_LOCK(dev, txq, cpu) {			\
3170
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3171
		__netif_tx_lock(txq, cpu);		\
3172 3173 3174
	}						\
}

3175 3176 3177 3178 3179
#define HARD_TX_TRYLOCK(dev, txq)			\
	(((dev->features & NETIF_F_LLTX) == 0) ?	\
		__netif_tx_trylock(txq) :		\
		true )

3180
#define HARD_TX_UNLOCK(dev, txq) {			\
3181
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3182
		__netif_tx_unlock(txq);			\
3183 3184 3185
	}						\
}

L
Linus Torvalds 已提交
3186 3187
static inline void netif_tx_disable(struct net_device *dev)
{
3188
	unsigned int i;
3189
	int cpu;
3190

3191 3192
	local_bh_disable();
	cpu = smp_processor_id();
3193 3194
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3195 3196

		__netif_tx_lock(txq, cpu);
3197
		netif_tx_stop_queue(txq);
3198
		__netif_tx_unlock(txq);
3199
	}
3200
	local_bh_enable();
L
Linus Torvalds 已提交
3201 3202
}

3203 3204 3205 3206 3207
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

3208 3209
static inline void netif_addr_lock_nested(struct net_device *dev)
{
3210 3211 3212 3213 3214 3215
	int subclass = SINGLE_DEPTH_NESTING;

	if (dev->netdev_ops->ndo_get_lock_subclass)
		subclass = dev->netdev_ops->ndo_get_lock_subclass(dev);

	spin_lock_nested(&dev->addr_list_lock, subclass);
3216 3217
}

3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232
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);
}

3233
/*
3234
 * dev_addrs walker. Should be used only for read access. Call with
3235 3236 3237
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
3238
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
3239

L
Linus Torvalds 已提交
3240 3241
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

3242
void ether_setup(struct net_device *dev);
L
Linus Torvalds 已提交
3243 3244

/* Support for loadable net-drivers */
3245
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
3246
				    unsigned char name_assign_type,
3247 3248
				    void (*setup)(struct net_device *),
				    unsigned int txqs, unsigned int rxqs);
3249 3250
#define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \
	alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1)
T
Tom Herbert 已提交
3251

3252 3253 3254
#define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \
	alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \
			 count)
T
Tom Herbert 已提交
3255

3256 3257
int register_netdev(struct net_device *dev);
void unregister_netdev(struct net_device *dev);
3258

3259
/* General hardware address lists handling functions */
3260 3261 3262 3263
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);
3264 3265 3266 3267 3268 3269 3270 3271 3272
int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
		       struct net_device *dev,
		       int (*sync)(struct net_device *, const unsigned char *),
		       int (*unsync)(struct net_device *,
				     const unsigned char *));
void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
			  struct net_device *dev,
			  int (*unsync)(struct net_device *,
					const unsigned char *));
3273
void __hw_addr_init(struct netdev_hw_addr_list *list);
3274

3275
/* Functions used for device addresses handling */
3276 3277 3278 3279 3280 3281
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);
3282 3283

/* Functions used for unicast addresses handling */
3284 3285 3286 3287 3288 3289 3290 3291
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);
3292

3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311
/**
 *  __dev_uc_sync - Synchonize device's unicast list
 *  @dev:  device to sync
 *  @sync: function to call if address should be added
 *  @unsync: function to call if address should be removed
 *
 *  Add newly added addresses to the interface, and release
 *  addresses that have been deleted.
 **/
static inline int __dev_uc_sync(struct net_device *dev,
				int (*sync)(struct net_device *,
					    const unsigned char *),
				int (*unsync)(struct net_device *,
					      const unsigned char *))
{
	return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
}

/**
3312
 *  __dev_uc_unsync - Remove synchronized addresses from device
3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324
 *  @dev:  device to sync
 *  @unsync: function to call if address should be removed
 *
 *  Remove all addresses that were added to the device by dev_uc_sync().
 **/
static inline void __dev_uc_unsync(struct net_device *dev,
				   int (*unsync)(struct net_device *,
						 const unsigned char *))
{
	__hw_addr_unsync_dev(&dev->uc, dev, unsync);
}

3325
/* Functions used for multicast addresses handling */
3326 3327 3328 3329 3330 3331 3332 3333 3334 3335
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);
3336

3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355
/**
 *  __dev_mc_sync - Synchonize device's multicast list
 *  @dev:  device to sync
 *  @sync: function to call if address should be added
 *  @unsync: function to call if address should be removed
 *
 *  Add newly added addresses to the interface, and release
 *  addresses that have been deleted.
 **/
static inline int __dev_mc_sync(struct net_device *dev,
				int (*sync)(struct net_device *,
					    const unsigned char *),
				int (*unsync)(struct net_device *,
					      const unsigned char *))
{
	return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
}

/**
3356
 *  __dev_mc_unsync - Remove synchronized addresses from device
3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368
 *  @dev:  device to sync
 *  @unsync: function to call if address should be removed
 *
 *  Remove all addresses that were added to the device by dev_mc_sync().
 **/
static inline void __dev_mc_unsync(struct net_device *dev,
				   int (*unsync)(struct net_device *,
						 const unsigned char *))
{
	__hw_addr_unsync_dev(&dev->mc, dev, unsync);
}

3369
/* Functions used for secondary unicast and multicast support */
3370 3371 3372 3373 3374 3375 3376
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
3377
/* Load a device via the kmod */
3378 3379 3380 3381 3382
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);
3383

L
Linus Torvalds 已提交
3384
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
3385
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
3386
extern int		weight_p;
3387
extern int		bpf_jit_enable;
J
Jiri Pirko 已提交
3388

3389
bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
3390 3391
struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3392 3393
struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3394

3395 3396 3397 3398 3399 3400 3401
/* iterate through upper list, must be called under RCU read lock */
#define netdev_for_each_upper_dev_rcu(dev, updev, iter) \
	for (iter = &(dev)->adj_list.upper, \
	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
	     updev; \
	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))

3402
/* iterate through upper list, must be called under RCU read lock */
3403 3404 3405 3406 3407
#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)))
3408

3409 3410 3411 3412
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);
3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425

#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)))

3426 3427 3428 3429 3430 3431 3432 3433
void *netdev_lower_get_next(struct net_device *dev,
				struct list_head **iter);
#define netdev_for_each_lower_dev(dev, ldev, iter) \
	for (iter = &(dev)->adj_list.lower, \
	     ldev = netdev_lower_get_next(dev, &(iter)); \
	     ldev; \
	     ldev = netdev_lower_get_next(dev, &(iter)))

3434
void *netdev_adjacent_get_private(struct list_head *adj_list);
3435
void *netdev_lower_get_first_private_rcu(struct net_device *dev);
3436 3437 3438 3439
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
3440
				 struct net_device *upper_dev);
3441 3442 3443 3444 3445
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);
3446
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
3447 3448
void *netdev_lower_dev_get_private(struct net_device *dev,
				   struct net_device *lower_dev);
3449 3450 3451 3452 3453 3454

/* RSS keys are 40 or 52 bytes long */
#define NETDEV_RSS_KEY_LEN 52
extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN];
void netdev_rss_key_fill(void *buffer, size_t len);

3455 3456
int dev_get_nest_level(struct net_device *dev,
		       bool (*type_check)(struct net_device *dev));
3457 3458 3459 3460 3461
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);
3462 3463 3464 3465 3466 3467

static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
	return __skb_gso_segment(skb, features, true);
}
3468
__be16 skb_network_protocol(struct sk_buff *skb, int *depth);
3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480

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)));
}
3481

3482
#ifdef CONFIG_BUG
3483
void netdev_rx_csum_fault(struct net_device *dev);
3484 3485 3486 3487 3488
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
L
Linus Torvalds 已提交
3489
/* rx skb timestamps */
3490 3491
void net_enable_timestamp(void);
void net_disable_timestamp(void);
L
Linus Torvalds 已提交
3492

3493
#ifdef CONFIG_PROC_FS
3494
int __init dev_proc_init(void);
3495 3496
#else
#define dev_proc_init() 0
3497 3498
#endif

D
David S. Miller 已提交
3499
static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
3500 3501
					      struct sk_buff *skb, struct net_device *dev,
					      bool more)
D
David S. Miller 已提交
3502
{
3503
	skb->xmit_more = more ? 1 : 0;
3504
	return ops->ndo_start_xmit(skb, dev);
D
David S. Miller 已提交
3505 3506
}

3507
static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
3508
					    struct netdev_queue *txq, bool more)
D
David S. Miller 已提交
3509 3510
{
	const struct net_device_ops *ops = dev->netdev_ops;
3511
	int rc;
D
David S. Miller 已提交
3512

3513
	rc = __netdev_start_xmit(ops, skb, dev, more);
3514 3515 3516 3517
	if (rc == NETDEV_TX_OK)
		txq_trans_update(txq);

	return rc;
D
David S. Miller 已提交
3518 3519
}

3520 3521 3522 3523
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);
3524 3525 3526 3527 3528 3529 3530 3531 3532 3533

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);
}
3534

3535 3536
extern struct kobj_ns_type_operations net_ns_type_operations;

3537
const char *netdev_drivername(const struct net_device *dev);
3538

3539
void linkwatch_run_queue(void);
3540

3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554
static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
							  netdev_features_t f2)
{
	if (f1 & NETIF_F_GEN_CSUM)
		f1 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
	if (f2 & NETIF_F_GEN_CSUM)
		f2 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
	f1 &= f2;
	if (f1 & NETIF_F_GEN_CSUM)
		f1 &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);

	return f1;
}

3555 3556
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
3557 3558 3559
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
3560 3561
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572

/* 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);
}

3573
int __netdev_update_features(struct net_device *dev);
3574
void netdev_update_features(struct net_device *dev);
3575
void netdev_change_features(struct net_device *dev);
3576

3577 3578 3579
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

3580
netdev_features_t netif_skb_features(struct sk_buff *skb);
3581

3582
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
3583
{
3584
	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
3585 3586 3587 3588 3589 3590 3591 3592

	/* 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));
3593 3594 3595 3596 3597 3598
	BUILD_BUG_ON(SKB_GSO_GRE     != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_IPIP    != (NETIF_F_GSO_IPIP >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_SIT     != (NETIF_F_GSO_SIT >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
3599
	BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
3600

3601
	return (features & feature) == feature;
3602 3603
}

3604
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
3605
{
H
Herbert Xu 已提交
3606
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
3607
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
3608 3609
}

T
Tom Herbert 已提交
3610
static inline bool netif_needs_gso(struct net_device *dev, struct sk_buff *skb,
3611
				   netdev_features_t features)
3612
{
3613
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
T
Tom Herbert 已提交
3614 3615
		(dev->netdev_ops->ndo_gso_check &&
		 !dev->netdev_ops->ndo_gso_check(skb, dev)) ||
3616 3617
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
3618 3619
}

3620 3621 3622 3623 3624 3625
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638
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;
}

3639 3640 3641 3642 3643
static inline bool netif_is_macvlan(struct net_device *dev)
{
	return dev->priv_flags & IFF_MACVLAN;
}

3644 3645 3646 3647 3648
static inline bool netif_is_macvlan_port(struct net_device *dev)
{
	return dev->priv_flags & IFF_MACVLAN_PORT;
}

3649 3650 3651 3652 3653
static inline bool netif_is_bond_master(struct net_device *dev)
{
	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
}

3654
static inline bool netif_is_bond_slave(struct net_device *dev)
J
Jiri Pirko 已提交
3655 3656 3657 3658
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

3659 3660 3661 3662 3663
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

3664 3665 3666 3667 3668 3669
/* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */
static inline void netif_keep_dst(struct net_device *dev)
{
	dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM);
}

3670
extern struct pernet_operations __net_initdata loopback_net_ops;
3671

3672 3673 3674 3675 3676 3677
/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

static inline const char *netdev_name(const struct net_device *dev)
{
3678 3679
	if (!dev->name[0] || strchr(dev->name, '%'))
		return "(unnamed net_device)";
3680 3681 3682
	return dev->name;
}

3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697
static inline const char *netdev_reg_state(const struct net_device *dev)
{
	switch (dev->reg_state) {
	case NETREG_UNINITIALIZED: return " (uninitialized)";
	case NETREG_REGISTERED: return "";
	case NETREG_UNREGISTERING: return " (unregistering)";
	case NETREG_UNREGISTERED: return " (unregistered)";
	case NETREG_RELEASED: return " (released)";
	case NETREG_DUMMY: return " (dummy)";
	}

	WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state);
	return " (unknown)";
}

3698
__printf(3, 4)
3699 3700
void netdev_printk(const char *level, const struct net_device *dev,
		   const char *format, ...);
3701
__printf(2, 3)
3702
void netdev_emerg(const struct net_device *dev, const char *format, ...);
3703
__printf(2, 3)
3704
void netdev_alert(const struct net_device *dev, const char *format, ...);
3705
__printf(2, 3)
3706
void netdev_crit(const struct net_device *dev, const char *format, ...);
3707
__printf(2, 3)
3708
void netdev_err(const struct net_device *dev, const char *format, ...);
3709
__printf(2, 3)
3710
void netdev_warn(const struct net_device *dev, const char *format, ...);
3711
__printf(2, 3)
3712
void netdev_notice(const struct net_device *dev, const char *format, ...);
3713
__printf(2, 3)
3714
void netdev_info(const struct net_device *dev, const char *format, ...);
3715

3716 3717 3718
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

3719
#if defined(CONFIG_DYNAMIC_DEBUG)
3720 3721
#define netdev_dbg(__dev, format, args...)			\
do {								\
3722
	dynamic_netdev_dbg(__dev, format, ##args);		\
3723
} while (0)
3724 3725 3726
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752
#else
#define netdev_dbg(__dev, format, args...)			\
({								\
	if (0)							\
		netdev_printk(KERN_DEBUG, __dev, format, ##args); \
})
#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...)			\
3753 3754
	WARN(1, "netdevice: %s%s\n" format, netdev_name(dev),	\
	     netdev_reg_state(dev), ##args)
3755

3756 3757 3758 3759 3760 3761 3762 3763
/* 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)

3764 3765 3766 3767 3768 3769
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

3770
#define netif_emerg(priv, type, dev, fmt, args...)		\
3771
	netif_level(emerg, priv, type, dev, fmt, ##args)
3772
#define netif_alert(priv, type, dev, fmt, args...)		\
3773
	netif_level(alert, priv, type, dev, fmt, ##args)
3774
#define netif_crit(priv, type, dev, fmt, args...)		\
3775
	netif_level(crit, priv, type, dev, fmt, ##args)
3776
#define netif_err(priv, type, dev, fmt, args...)		\
3777
	netif_level(err, priv, type, dev, fmt, ##args)
3778
#define netif_warn(priv, type, dev, fmt, args...)		\
3779
	netif_level(warn, priv, type, dev, fmt, ##args)
3780
#define netif_notice(priv, type, dev, fmt, args...)		\
3781
	netif_level(notice, priv, type, dev, fmt, ##args)
3782
#define netif_info(priv, type, dev, fmt, args...)		\
3783
	netif_level(info, priv, type, dev, fmt, ##args)
3784

3785
#if defined(CONFIG_DYNAMIC_DEBUG)
3786 3787 3788
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
3789
		dynamic_netdev_dbg(netdev, format, ##args);	\
3790
} while (0)
3791 3792 3793
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
3794 3795 3796 3797 3798 3799 3800 3801 3802 3803
#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)
3804
#define netif_vdbg	netif_dbg
3805 3806 3807 3808
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
3809
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
3810 3811 3812
	0;							\
})
#endif
3813

3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843
/*
 *	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)

3844
#endif	/* _LINUX_NETDEVICE_H */