netdevice.h 134.0 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/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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#include <uapi/linux/if_bonding.h>
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#include <uapi/linux/pkt_cls.h>
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#include <linux/hashtable.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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struct mpls_dev;
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/* UDP Tunnel offloads */
struct udp_tunnel_info;
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struct bpf_prog;
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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
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 * higher layers. Virtual network devices transmit synchronously; in this case
 * the driver transmit return codes are consumed by dev_queue_xmit(), and all
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 * 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_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*/
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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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/*
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 *	Compute the worst-case header length according to the protocols
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 *	used.
 */
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#if defined(CONFIG_HYPERV_NET)
# define LL_MAX_HEADER 128
#elif 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)];
};

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/* Reserve HH_DATA_MOD byte-aligned hard_header_len, but at least that much.
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 * 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);
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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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	bool	(*validate)(const char *ll_header, unsigned int len);
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};

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


/*
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 * This structure holds 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
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	 * to the per-CPU poll_list, and whoever clears that bit
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	 * 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 (busy polling possible) */
	NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */
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	NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */
};

enum {
	NAPIF_STATE_SCHED	 = (1UL << NAPI_STATE_SCHED),
	NAPIF_STATE_DISABLE	 = (1UL << NAPI_STATE_DISABLE),
	NAPIF_STATE_NPSVC	 = (1UL << NAPI_STATE_NPSVC),
	NAPIF_STATE_HASHED	 = (1UL << NAPI_STATE_HASHED),
	NAPIF_STATE_NO_BUSY_POLL = (1UL << NAPI_STATE_NO_BUSY_POLL),
	NAPIF_STATE_IN_BUSY_POLL = (1UL << NAPI_STATE_IN_BUSY_POLL),
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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.
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 * @RX_HANDLER_PASS: Do nothing, pass the skb as if no rx_handler was called.
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 *
 * 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.
 *
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 * If the rx_handler consumed the skb in some way, it should return
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 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
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 * the skb to be delivered in some other way.
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 *
 * 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.
 *
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 * If the rx_handler decides the skb should be ignored, it should return
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 * 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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 *
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 * If the rx_handler didn't change skb->dev, but wants the skb to be normally
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 * 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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/**
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 *	napi_schedule_prep - check if NAPI can be scheduled
 *	@n: NAPI context
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 *
 * Test if NAPI routine is already running, and if not mark
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 * it as running.  This is used as a condition variable to
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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
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 *	@n: NAPI context
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 *
 * 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
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 *	@n: NAPI context
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 *
 * 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
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 *	@n: NAPI context
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 *
 * 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_hash_del - remove a NAPI from global table
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 *	@napi: NAPI context
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 *
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 * Warning: caller must observe RCU grace period
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 * before freeing memory containing @napi, if
 * this function returns true.
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 * Note: core networking stack automatically calls it
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 * from netif_napi_del().
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 * Drivers might want to call this helper to combine all
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 * the needed RCU grace periods into a single one.
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 */
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bool napi_hash_del(struct napi_struct *napi);
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/**
 *	napi_disable - prevent NAPI from scheduling
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 *	@n: NAPI context
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 *
 * 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
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 *	@n: NAPI context
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 *
 * 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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	clear_bit(NAPI_STATE_NPSVC, &n->state);
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}

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/**
 *	napi_synchronize - wait until NAPI is not running
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 *	@n: NAPI context
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 *
 * 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)
{
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	if (IS_ENABLED(CONFIG_SMP))
		while (test_bit(NAPI_STATE_SCHED, &n->state))
			msleep(1);
	else
		barrier();
533 534
}

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enum netdev_queue_state_t {
536 537
	__QUEUE_STATE_DRV_XOFF,
	__QUEUE_STATE_STACK_XOFF,
538
	__QUEUE_STATE_FROZEN,
539
};
540 541 542 543 544 545 546 547 548 549 550

#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)

551 552 553 554 555 556 557 558 559
/*
 * __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_*.
 */
560

561
struct netdev_queue {
562
/*
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 * read-mostly part
564
 */
565
	struct net_device	*dev;
566
	struct Qdisc __rcu	*qdisc;
567
	struct Qdisc		*qdisc_sleeping;
568
#ifdef CONFIG_SYSFS
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	struct kobject		kobj;
#endif
571 572 573
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	int			numa_node;
#endif
574 575 576 577 578 579
	unsigned long		tx_maxrate;
	/*
	 * Number of TX timeouts for this queue
	 * (/sys/class/net/DEV/Q/trans_timeout)
	 */
	unsigned long		trans_timeout;
580
/*
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 * write-mostly part
582 583 584
 */
	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
	int			xmit_lock_owner;
585
	/*
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	 * Time (in jiffies) of last Tx
587 588
	 */
	unsigned long		trans_start;
589

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	unsigned long		state;

#ifdef CONFIG_BQL
	struct dql		dql;
#endif
595
} ____cacheline_aligned_in_smp;
596

597 598 599 600 601
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
602
	return NUMA_NO_NODE;
603 604 605 606 607 608 609 610 611 612
#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];
};
623
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
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/*
626 627 628
 * 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;
632
	u16 filter;
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	unsigned int last_qtail;
};
635
#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) + \
646
    ((_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).
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 * Each entry is a 32bit value. Upper part is the high-order bits
 * of flow hash, lower part is CPU number.
653
 * rps_cpu_mask is used to partition the space, depending on number of
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 * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1
 * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f,
656
 * meaning we use 32-6=26 bits for the hash.
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 */
struct rps_sock_flow_table {
659
	u32	mask;
660 661

	u32	ents[0] ____cacheline_aligned_in_smp;
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};
663
#define	RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num]))
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#define RPS_NO_CPU 0xffff

667 668 669
extern u32 rps_cpu_mask;
extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;

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static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
					u32 hash)
{
	if (table && hash) {
674 675
		unsigned int index = hash & table->mask;
		u32 val = hash & ~rps_cpu_mask;
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		/* We only give a hint, preemption can change CPU under us */
678
		val |= raw_smp_processor_id();
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680 681
		if (table->ents[index] != val)
			table->ents[index] = val;
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682 683 684
	}
}

685
#ifdef CONFIG_RFS_ACCEL
686 687
bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
			 u16 filter_id);
688
#endif
689
#endif /* CONFIG_RPS */
690

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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
693
#ifdef CONFIG_RPS
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	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
696
#endif
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	struct kobject			kobj;
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	struct net_device		*dev;
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} ____cacheline_aligned_in_smp;
700 701 702 703 704 705 706 707 708 709 710

/*
 * 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);
};
711

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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];
};
723
#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
724 725
#define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \
       - sizeof(struct xps_map)) / sizeof(u16))
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/*
 * 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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};
734 735
#define XPS_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) +		\
	(nr_cpu_ids * (_tcs) * sizeof(struct xps_map *)))
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#endif /* CONFIG_XPS */

738 739 740 741 742 743 744 745
#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;
};

746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
#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

763
#define MAX_PHYS_ITEM_ID_LEN 32
764

765 766
/* This structure holds a unique identifier to identify some
 * physical item (port for example) used by a netdevice.
767
 */
768 769
struct netdev_phys_item_id {
	unsigned char id[MAX_PHYS_ITEM_ID_LEN];
770 771 772
	unsigned char id_len;
};

773 774 775 776 777 778 779
static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
					    struct netdev_phys_item_id *b)
{
	return a->id_len == b->id_len &&
	       memcmp(a->id, b->id, a->id_len) == 0;
}

780 781 782
typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
				       struct sk_buff *skb);

783
/* These structures hold the attributes of qdisc and classifiers
784 785 786 787
 * that are being passed to the netdevice through the setup_tc op.
 */
enum {
	TC_SETUP_MQPRIO,
788
	TC_SETUP_CLSU32,
789
	TC_SETUP_CLSFLOWER,
790
	TC_SETUP_MATCHALL,
791
	TC_SETUP_CLSBPF,
792 793
};

794 795
struct tc_cls_u32_offload;

796 797 798 799
struct tc_to_netdev {
	unsigned int type;
	union {
		u8 tc;
800
		struct tc_cls_u32_offload *cls_u32;
801
		struct tc_cls_flower_offload *cls_flower;
802
		struct tc_cls_matchall_offload *cls_mall;
803
		struct tc_cls_bpf_offload *cls_bpf;
804 805 806
	};
};

807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
/* These structures hold the attributes of xdp state that are being passed
 * to the netdevice through the xdp op.
 */
enum xdp_netdev_command {
	/* Set or clear a bpf program used in the earliest stages of packet
	 * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee
	 * is responsible for calling bpf_prog_put on any old progs that are
	 * stored. In case of error, the callee need not release the new prog
	 * reference, but on success it takes ownership and must bpf_prog_put
	 * when it is no longer used.
	 */
	XDP_SETUP_PROG,
	/* Check if a bpf program is set on the device.  The callee should
	 * return true if a program is currently attached and running.
	 */
	XDP_QUERY_PROG,
};

struct netdev_xdp {
	enum xdp_netdev_command command;
	union {
		/* XDP_SETUP_PROG */
		struct bpf_prog *prog;
		/* XDP_QUERY_PROG */
		bool prog_attached;
	};
};
834

835 836
/*
 * This structure defines the management hooks for network devices.
837 838
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
839 840
 *
 * int (*ndo_init)(struct net_device *dev);
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 *     This function is called once when a network device is registered.
 *     The network device can use this for any late stage initialization
 *     or semantic validation. It can fail with an error code which will
 *     be propagated back to register_netdev.
845 846 847 848 849 850
 *
 * 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);
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 *     This function is called when a network device transitions to the up
852 853 854
 *     state.
 *
 * int (*ndo_stop)(struct net_device *dev);
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855
 *     This function is called when a network device transitions to the down
856 857
 *     state.
 *
858 859
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
860
 *	Called when a packet needs to be transmitted.
861 862 863 864
 *	Returns NETDEV_TX_OK.  Can return NETDEV_TX_BUSY, but you should stop
 *	the queue before that can happen; it's for obsolete devices and weird
 *	corner cases, but the stack really does a non-trivial amount
 *	of useless work if you return NETDEV_TX_BUSY.
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865
 *	Required; cannot be NULL.
866
 *
867 868 869 870 871 872
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *		netdev_features_t features);
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
873
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
874
 *                         void *accel_priv, select_queue_fallback_t fallback);
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875
 *	Called to decide which queue to use when device supports multiple
876 877
 *	transmit queues.
 *
878 879
 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 *	This function is called to allow device receiver to make
B
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880
 *	changes to configuration when multicast or promiscuous is enabled.
881 882 883
 *
 * void (*ndo_set_rx_mode)(struct net_device *dev);
 *	This function is called device changes address list filtering.
884
 *	If driver handles unicast address filtering, it should set
B
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 *	IFF_UNICAST_FLT in its priv_flags.
886 887 888
 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *	This function  is called when the Media Access Control address
889
 *	needs to be changed. If this interface is not defined, the
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890
 *	MAC address can not be changed.
891 892 893 894 895
 *
 * 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);
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896 897
 *	Called when a user requests an ioctl which can't be handled by
 *	the generic interface code. If not defined ioctls return
898 899 900 901
 *	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
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 *	is retained for legacy reasons; new devices should use the bus
903 904 905 906 907 908 909
 *	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.
 *
910
 * void (*ndo_tx_timeout)(struct net_device *dev);
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 *	Callback used when the transmitter has not made any progress
912 913
 *	for dev->watchdog ticks.
 *
914
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
915
 *                      struct rtnl_link_stats64 *storage);
916
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
917
 *	Called when a user wants to get the network device usage
918
 *	statistics. Drivers must do one of the following:
919 920
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
921
 *	2. Define @ndo_get_stats to update a net_device_stats structure
922 923 924 925 926
 *	   (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.
927
 *
928 929 930 931 932 933 934 935
 * bool (*ndo_has_offload_stats)(int attr_id)
 *	Return true if this device supports offload stats of this attr_id.
 *
 * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev,
 *	void *attr_data)
 *	Get statistics for offload operations by attr_id. Write it into the
 *	attr_data pointer.
 *
936
 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid);
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937
 *	If device supports VLAN filtering this function is called when a
938
 *	VLAN id is registered.
939
 *
940
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid);
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941
 *	If device supports VLAN filtering this function is called when a
942
 *	VLAN id is unregistered.
943 944
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
945 946 947
 *
 *	SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
948 949
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan,
 *			  u8 qos, __be16 proto);
950 951
 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
 *			  int max_tx_rate);
952
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
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Hiroshi Shimamoto 已提交
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 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting);
954 955
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
956
 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
957 958
 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 *			  struct nlattr *port[]);
959 960 961
 *
 *      Enable or disable the VF ability to query its RSS Redirection Table and
 *      Hash Key. This is needed since on some devices VF share this information
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962
 *      with PF and querying it may introduce a theoretical security risk.
963
 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting);
964
 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
965 966 967 968 969
 * 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.
970
 *
971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
 *	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.
 *
1001 1002 1003 1004 1005 1006 1007
 * 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.
 *
1008 1009 1010 1011 1012 1013
 * 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.
 *
1014 1015 1016 1017 1018 1019
 *	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.
1020
 *
1021
 *	Slave management functions (for bridge, bonding, etc).
1022 1023 1024 1025 1026
 * 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.
1027 1028
 *
 *      Feature/offload setting functions.
1029
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
1030 1031 1032 1033
 *	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.
 *
1034 1035
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
1036
 *		      const unsigned char *addr, u16 vid, u16 flags)
1037
 *	Adds an FDB entry to dev for addr.
1038 1039
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
1040
 *		      const unsigned char *addr, u16 vid)
1041 1042
 *	Deletes the FDB entry from dev coresponding to addr.
 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
1043
 *		       struct net_device *dev, struct net_device *filter_dev,
1044
 *		       int *idx)
1045 1046
 *	Used to add FDB entries to dump requests. Implementers should add
 *	entries to skb and update idx with the number of entries.
J
John Fastabend 已提交
1047
 *
1048 1049
 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh,
 *			     u16 flags)
J
John Fastabend 已提交
1050
 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
1051 1052
 *			     struct net_device *dev, u32 filter_mask,
 *			     int nlflags)
1053 1054
 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh,
 *			     u16 flags);
J
Jiri Pirko 已提交
1055 1056 1057 1058 1059 1060 1061 1062
 *
 * 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.
1063 1064
 *
 * int (*ndo_get_phys_port_id)(struct net_device *dev,
1065
 *			       struct netdev_phys_item_id *ppid);
1066 1067 1068
 *	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.
1069
 *
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
 * void (*ndo_udp_tunnel_add)(struct net_device *dev,
 *			      struct udp_tunnel_info *ti);
 *	Called by UDP tunnel to notify a driver about the UDP port and socket
 *	address family that a UDP tunnel is listnening to. It is called only
 *	when a new port starts listening. The operation is protected by the
 *	RTNL.
 *
 * void (*ndo_udp_tunnel_del)(struct net_device *dev,
 *			      struct udp_tunnel_info *ti);
 *	Called by UDP tunnel to notify the driver about a UDP port and socket
 *	address family that the UDP tunnel is not listening to anymore. The
 *	operation is protected by the RTNL.
 *
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
 * 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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Bjorn Helgaas 已提交
1101 1102 1103
 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
 *					   struct net_device *dev
 *					   netdev_features_t features);
T
Tom Herbert 已提交
1104
 *	Called by core transmit path to determine if device is capable of
1105 1106 1107 1108 1109
 *	performing offload operations on a given packet. This is to give
 *	the device an opportunity to implement any restrictions that cannot
 *	be otherwise expressed by feature flags. The check is called with
 *	the set of features that the stack has calculated and it returns
 *	those the driver believes to be appropriate.
1110 1111 1112 1113
 * int (*ndo_set_tx_maxrate)(struct net_device *dev,
 *			     int queue_index, u32 maxrate);
 *	Called when a user wants to set a max-rate limitation of specific
 *	TX queue.
1114 1115
 * int (*ndo_get_iflink)(const struct net_device *dev);
 *	Called to get the iflink value of this device.
1116
 * void (*ndo_change_proto_down)(struct net_device *dev,
B
Bjorn Helgaas 已提交
1117
 *				 bool proto_down);
1118 1119 1120
 *	This function is used to pass protocol port error state information
 *	to the switch driver. The switch driver can react to the proto_down
 *      by doing a phys down on the associated switch port.
1121 1122 1123 1124
 * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb);
 *	This function is used to get egress tunnel information for given skb.
 *	This is useful for retrieving outer tunnel header parameters while
 *	sampling packet.
1125 1126 1127 1128
 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);
 *	This function is used to specify the headroom that the skb must
 *	consider when allocation skb during packet reception. Setting
 *	appropriate rx headroom value allows avoiding skb head copy on
B
Bjorn Helgaas 已提交
1129
 *	forward. Setting a negative value resets the rx headroom to the
1130
 *	default value.
1131 1132 1133
 * int (*ndo_xdp)(struct net_device *dev, struct netdev_xdp *xdp);
 *	This function is used to set or query state related to XDP on the
 *	netdevice. See definition of enum xdp_netdev_command for details.
1134
 *
1135 1136 1137 1138 1139 1140
 */
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);
1141 1142 1143 1144 1145
	netdev_tx_t		(*ndo_start_xmit)(struct sk_buff *skb,
						  struct net_device *dev);
	netdev_features_t	(*ndo_features_check)(struct sk_buff *skb,
						      struct net_device *dev,
						      netdev_features_t features);
1146
	u16			(*ndo_select_queue)(struct net_device *dev,
1147
						    struct sk_buff *skb,
1148 1149
						    void *accel_priv,
						    select_queue_fallback_t fallback);
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
	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);
1160 1161 1162 1163
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
1164 1165
	void			(*ndo_tx_timeout) (struct net_device *dev);

1166 1167
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
1168 1169 1170 1171
	bool			(*ndo_has_offload_stats)(int attr_id);
	int			(*ndo_get_offload_stats)(int attr_id,
							 const struct net_device *dev,
							 void *attr_data);
1172 1173
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

1174
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
1175
						       __be16 proto, u16 vid);
1176
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1177
						        __be16 proto, u16 vid);
1178 1179
#ifdef CONFIG_NET_POLL_CONTROLLER
	void                    (*ndo_poll_controller)(struct net_device *dev);
H
Herbert Xu 已提交
1180
	int			(*ndo_netpoll_setup)(struct net_device *dev,
1181
						     struct netpoll_info *info);
1182
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
E
Eliezer Tamir 已提交
1183
#endif
1184
#ifdef CONFIG_NET_RX_BUSY_POLL
1185
	int			(*ndo_busy_poll)(struct napi_struct *dev);
1186
#endif
1187 1188 1189
	int			(*ndo_set_vf_mac)(struct net_device *dev,
						  int queue, u8 *mac);
	int			(*ndo_set_vf_vlan)(struct net_device *dev,
1190 1191
						   int queue, u16 vlan,
						   u8 qos, __be16 proto);
1192 1193 1194
	int			(*ndo_set_vf_rate)(struct net_device *dev,
						   int vf, int min_tx_rate,
						   int max_tx_rate);
1195 1196
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
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Hiroshi Shimamoto 已提交
1197 1198
	int			(*ndo_set_vf_trust)(struct net_device *dev,
						    int vf, bool setting);
1199 1200 1201
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
1202 1203
	int			(*ndo_set_vf_link_state)(struct net_device *dev,
							 int vf, int link_state);
1204 1205 1206 1207
	int			(*ndo_get_vf_stats)(struct net_device *dev,
						    int vf,
						    struct ifla_vf_stats
						    *vf_stats);
1208 1209 1210 1211 1212
	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);
1213 1214 1215
	int			(*ndo_set_vf_guid)(struct net_device *dev,
						   int vf, u64 guid,
						   int guid_type);
1216 1217 1218
	int			(*ndo_set_vf_rss_query_en)(
						   struct net_device *dev,
						   int vf, bool setting);
1219 1220 1221 1222
	int			(*ndo_setup_tc)(struct net_device *dev,
						u32 handle,
						__be16 protocol,
						struct tc_to_netdev *tc);
1223
#if IS_ENABLED(CONFIG_FCOE)
1224 1225
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
1226 1227 1228 1229 1230 1231
	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);
1232 1233 1234 1235
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
1236 1237
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
1238 1239
#endif

1240
#if IS_ENABLED(CONFIG_LIBFCOE)
1241 1242 1243 1244
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
1245
#endif
1246

1247 1248 1249 1250 1251 1252
#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
1253 1254 1255 1256
	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);
1257 1258
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
1259
	int			(*ndo_set_features)(struct net_device *dev,
1260
						    netdev_features_t features);
1261 1262 1263 1264
	int			(*ndo_neigh_construct)(struct net_device *dev,
						       struct neighbour *n);
	void			(*ndo_neigh_destroy)(struct net_device *dev,
						     struct neighbour *n);
1265 1266

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1267
					       struct nlattr *tb[],
1268
					       struct net_device *dev,
1269
					       const unsigned char *addr,
1270
					       u16 vid,
1271 1272
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1273
					       struct nlattr *tb[],
1274
					       struct net_device *dev,
1275 1276
					       const unsigned char *addr,
					       u16 vid);
1277 1278 1279
	int			(*ndo_fdb_dump)(struct sk_buff *skb,
						struct netlink_callback *cb,
						struct net_device *dev,
1280
						struct net_device *filter_dev,
1281
						int *idx);
J
John Fastabend 已提交
1282 1283

	int			(*ndo_bridge_setlink)(struct net_device *dev,
1284 1285
						      struct nlmsghdr *nlh,
						      u16 flags);
J
John Fastabend 已提交
1286 1287
	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
						      u32 pid, u32 seq,
1288
						      struct net_device *dev,
1289 1290
						      u32 filter_mask,
						      int nlflags);
1291
	int			(*ndo_bridge_dellink)(struct net_device *dev,
1292 1293
						      struct nlmsghdr *nlh,
						      u16 flags);
J
Jiri Pirko 已提交
1294 1295
	int			(*ndo_change_carrier)(struct net_device *dev,
						      bool new_carrier);
1296
	int			(*ndo_get_phys_port_id)(struct net_device *dev,
1297
							struct netdev_phys_item_id *ppid);
1298 1299
	int			(*ndo_get_phys_port_name)(struct net_device *dev,
							  char *name, size_t len);
1300 1301 1302 1303
	void			(*ndo_udp_tunnel_add)(struct net_device *dev,
						      struct udp_tunnel_info *ti);
	void			(*ndo_udp_tunnel_del)(struct net_device *dev,
						      struct udp_tunnel_info *ti);
1304 1305 1306 1307 1308 1309 1310 1311
	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);
1312
	int			(*ndo_get_lock_subclass)(struct net_device *dev);
1313 1314 1315
	int			(*ndo_set_tx_maxrate)(struct net_device *dev,
						      int queue_index,
						      u32 maxrate);
1316
	int			(*ndo_get_iflink)(const struct net_device *dev);
1317 1318
	int			(*ndo_change_proto_down)(struct net_device *dev,
							 bool proto_down);
1319 1320
	int			(*ndo_fill_metadata_dst)(struct net_device *dev,
						       struct sk_buff *skb);
1321 1322
	void			(*ndo_set_rx_headroom)(struct net_device *dev,
						       int needed_headroom);
1323 1324
	int			(*ndo_xdp)(struct net_device *dev,
					   struct netdev_xdp *xdp);
1325 1326
};

1327 1328 1329 1330 1331
/**
 * 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
B
Bjorn Helgaas 已提交
1332
 * userspace; this means that the order of these flags can change
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
 * 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_BONDING: bonding master or slave
 * @IFF_ISATAP: ISATAP interface (RFC4214)
 * @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
1356 1357 1358 1359
 * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account
 *	underlying stacked devices
 * @IFF_IPVLAN_MASTER: IPvlan master device
 * @IFF_IPVLAN_SLAVE: IPvlan slave device
1360
 * @IFF_L3MDEV_MASTER: device is an L3 master device
1361
 * @IFF_NO_QUEUE: device can run without qdisc attached
1362
 * @IFF_OPENVSWITCH: device is a Open vSwitch master
D
David Ahern 已提交
1363
 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
J
Jiri Pirko 已提交
1364
 * @IFF_TEAM: device is a team device
1365
 * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
1366 1367
 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
 *	entity (i.e. the master device for bridged veth)
1368
 * @IFF_MACSEC: device is a MACsec device
1369 1370 1371 1372
 */
enum netdev_priv_flags {
	IFF_802_1Q_VLAN			= 1<<0,
	IFF_EBRIDGE			= 1<<1,
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
	IFF_BONDING			= 1<<2,
	IFF_ISATAP			= 1<<3,
	IFF_WAN_HDLC			= 1<<4,
	IFF_XMIT_DST_RELEASE		= 1<<5,
	IFF_DONT_BRIDGE			= 1<<6,
	IFF_DISABLE_NETPOLL		= 1<<7,
	IFF_MACVLAN_PORT		= 1<<8,
	IFF_BRIDGE_PORT			= 1<<9,
	IFF_OVS_DATAPATH		= 1<<10,
	IFF_TX_SKB_SHARING		= 1<<11,
	IFF_UNICAST_FLT			= 1<<12,
	IFF_TEAM_PORT			= 1<<13,
	IFF_SUPP_NOFCS			= 1<<14,
	IFF_LIVE_ADDR_CHANGE		= 1<<15,
	IFF_MACVLAN			= 1<<16,
	IFF_XMIT_DST_RELEASE_PERM	= 1<<17,
	IFF_IPVLAN_MASTER		= 1<<18,
	IFF_IPVLAN_SLAVE		= 1<<19,
1391
	IFF_L3MDEV_MASTER		= 1<<20,
1392 1393
	IFF_NO_QUEUE			= 1<<21,
	IFF_OPENVSWITCH			= 1<<22,
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David Ahern 已提交
1394
	IFF_L3MDEV_SLAVE		= 1<<23,
J
Jiri Pirko 已提交
1395
	IFF_TEAM			= 1<<24,
1396
	IFF_RXFH_CONFIGURED		= 1<<25,
1397
	IFF_PHONY_HEADROOM		= 1<<26,
1398
	IFF_MACSEC			= 1<<27,
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
};

#define IFF_802_1Q_VLAN			IFF_802_1Q_VLAN
#define IFF_EBRIDGE			IFF_EBRIDGE
#define IFF_BONDING			IFF_BONDING
#define IFF_ISATAP			IFF_ISATAP
#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
1418
#define IFF_XMIT_DST_RELEASE_PERM	IFF_XMIT_DST_RELEASE_PERM
1419 1420
#define IFF_IPVLAN_MASTER		IFF_IPVLAN_MASTER
#define IFF_IPVLAN_SLAVE		IFF_IPVLAN_SLAVE
1421
#define IFF_L3MDEV_MASTER		IFF_L3MDEV_MASTER
1422
#define IFF_NO_QUEUE			IFF_NO_QUEUE
1423
#define IFF_OPENVSWITCH			IFF_OPENVSWITCH
1424
#define IFF_L3MDEV_SLAVE		IFF_L3MDEV_SLAVE
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Jiri Pirko 已提交
1425
#define IFF_TEAM			IFF_TEAM
1426
#define IFF_RXFH_CONFIGURED		IFF_RXFH_CONFIGURED
1427
#define IFF_MACSEC			IFF_MACSEC
1428

1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
/**
 *	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
 *
1446 1447
 *	@carrier_changes:	Stats to monitor carrier on<->off transitions
 *
1448 1449
 *	@state:		Generic network queuing layer state, see netdev_state_t
 *	@dev_list:	The global list of network devices
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Bjorn Helgaas 已提交
1450 1451 1452 1453
 *	@napi_list:	List entry used for polling NAPI devices
 *	@unreg_list:	List entry  when we are unregistering the
 *			device; see the function unregister_netdev
 *	@close_list:	List entry used when we are closing the device
1454 1455
 *	@ptype_all:     Device-specific packet handlers for all protocols
 *	@ptype_specific: Device-specific, protocol-specific packet handlers
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
 *
 *	@adj_list:	Directly linked devices, like slaves for bonding
 *	@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
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Bjorn Helgaas 已提交
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 *	@group:		The group the device belongs to
1473 1474 1475 1476 1477 1478 1479 1480
 *
 *	@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
1481 1482
 *	@rx_nohandler:	nohandler dropped packets by core network on
 *			inactive devices, do not use this in drivers
1483 1484 1485 1486 1487 1488 1489 1490 1491
 *
 *	@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
1492 1493
 *	@ndisc_ops:	Includes callbacks for different IPv6 neighbour
 *			discovery handling. Necessary for e.g. 6LoWPAN.
E
Eric W. Biederman 已提交
1494
 *	@header_ops:	Includes callbacks for creating,parsing,caching,etc
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
 *			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
1507 1508
 *	@min_mtu:	Interface Minimum MTU value
 *	@max_mtu:	Interface Maximum MTU value
1509
 *	@type:		Interface hardware type
1510
 *	@hard_header_len: Maximum hardware header length.
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
 *
 *	@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
1523
 *	@neigh_priv_len:	Used in neigh_alloc()
1524 1525 1526 1527 1528
 * 	@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
B
Bjorn Helgaas 已提交
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 *	@uc_promisc:		Counter that indicates promiscuous mode
1530 1531 1532
 *				has been enabled due to the need to listen to
 *				additional unicast addresses in a device that
 *				does not implement ndo_set_rx_mode()
1533 1534 1535 1536
 *	@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
B
Bjorn Helgaas 已提交
1537 1538 1539
 *	@promiscuity:		Number of times the NIC is told to work in
 *				promiscuous mode; if it becomes 0 the NIC will
 *				exit promiscuous mode
1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
 *	@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
 *
1566 1567 1568 1569 1570 1571
 *	@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
 *	@index_hlist:		Device index hash chain
 *
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
 *	@_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
 *
 *	@watchdog_timeo:	Represents the timeout that is used by
B
Bjorn Helgaas 已提交
1582
 *				the watchdog (see dev_watchdog())
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
 *	@watchdog_timer:	List of timers
 *
 *	@pcpu_refcnt:		Number of references to this device
 *	@todo_list:		Delayed register/unregister
 *	@link_watch_list:	XXX: need comments on this one
 *
 *	@reg_state:		Register/unregister state machine
 *	@dismantle:		Device is going to be freed
 *	@rtnl_link_state:	This enum represents the phases of creating
 *				a new link
 *
 *	@destructor:		Called from unregister,
 *				can be used to call free_netdev
 *	@npinfo:		XXX: need comments on this one
 * 	@nd_net:		Network namespace this network device is inside
 *
 * 	@ml_priv:	Mid-layer private
 * 	@lstats:	Loopback statistics
 * 	@tstats:	Tunnel statistics
 * 	@dstats:	Dummy statistics
 * 	@vstats:	Virtual ethernet statistics
 *
 *	@garp_port:	GARP
 *	@mrp_port:	MRP
 *
 *	@dev:		Class/net/name entry
 *	@sysfs_groups:	Space for optional device, statistics and wireless
 *			sysfs groups
 *
 *	@sysfs_rx_queue_group:	Space for optional per-rx queue attributes
 *	@rtnl_link_ops:	Rtnl_link_ops
 *
 *	@gso_max_size:	Maximum size of generic segmentation offload
 *	@gso_max_segs:	Maximum number of segments that can be passed to the
 *			NIC for GSO
 *
 *	@dcbnl_ops:	Data Center Bridging netlink ops
 *	@num_tc:	Number of traffic classes in the net device
 *	@tc_to_txq:	XXX: need comments on this one
 *	@prio_tc_map	XXX: need comments on this one
 *
 *	@fcoe_ddp_xid:	Max exchange id for FCoE LRO by ddp
 *
 *	@priomap:	XXX: need comments on this one
 *	@phydev:	Physical device may attach itself
 *			for hardware timestamping
 *
1630 1631
 *	@qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
 *	@qdisc_running_key: lockdep class annotating Qdisc->running seqcount
1632
 *
1633 1634 1635 1636
 *	@proto_down:	protocol port state information can be sent to the
 *			switch driver and used to set the phys state of the
 *			switch port.
 *
L
Linus Torvalds 已提交
1637 1638 1639 1640
 *	FIXME: cleanup struct net_device such that network protocol info
 *	moves out.
 */

E
Eric Dumazet 已提交
1641
struct net_device {
L
Linus Torvalds 已提交
1642
	char			name[IFNAMSIZ];
1643
	struct hlist_node	name_hlist;
1644
	char 			*ifalias;
L
Linus Torvalds 已提交
1645 1646 1647 1648
	/*
	 *	I/O specific fields
	 *	FIXME: Merge these and struct ifmap into one
	 */
1649 1650 1651 1652
	unsigned long		mem_end;
	unsigned long		mem_start;
	unsigned long		base_addr;
	int			irq;
L
Linus Torvalds 已提交
1653

1654 1655
	atomic_t		carrier_changes;

L
Linus Torvalds 已提交
1656
	/*
1657 1658
	 *	Some hardware also needs these fields (state,dev_list,
	 *	napi_list,unreg_list,close_list) but they are not
L
Linus Torvalds 已提交
1659 1660 1661 1662 1663
	 *	part of the usual set specified in Space.c.
	 */

	unsigned long		state;

1664
	struct list_head	dev_list;
1665
	struct list_head	napi_list;
1666
	struct list_head	unreg_list;
1667
	struct list_head	close_list;
1668 1669
	struct list_head	ptype_all;
	struct list_head	ptype_specific;
1670 1671 1672 1673 1674 1675

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

1676 1677 1678 1679
	netdev_features_t	features;
	netdev_features_t	hw_features;
	netdev_features_t	wanted_features;
	netdev_features_t	vlan_features;
1680
	netdev_features_t	hw_enc_features;
S
Simon Horman 已提交
1681
	netdev_features_t	mpls_features;
1682
	netdev_features_t	gso_partial_features;
1683

L
Linus Torvalds 已提交
1684
	int			ifindex;
1685
	int			group;
L
Linus Torvalds 已提交
1686

R
Rusty Russell 已提交
1687
	struct net_device_stats	stats;
1688 1689 1690

	atomic_long_t		rx_dropped;
	atomic_long_t		tx_dropped;
1691
	atomic_long_t		rx_nohandler;
L
Linus Torvalds 已提交
1692

1693
#ifdef CONFIG_WIRELESS_EXT
B
Bjorn Helgaas 已提交
1694 1695
	const struct iw_handler_def *wireless_handlers;
	struct iw_public_data	*wireless_data;
1696
#endif
1697
	const struct net_device_ops *netdev_ops;
1698
	const struct ethtool_ops *ethtool_ops;
S
Scott Feldman 已提交
1699
#ifdef CONFIG_NET_SWITCHDEV
J
Jiri Pirko 已提交
1700
	const struct switchdev_ops *switchdev_ops;
S
Scott Feldman 已提交
1701
#endif
1702 1703 1704
#ifdef CONFIG_NET_L3_MASTER_DEV
	const struct l3mdev_ops	*l3mdev_ops;
#endif
1705 1706 1707
#if IS_ENABLED(CONFIG_IPV6)
	const struct ndisc_ops *ndisc_ops;
#endif
L
Linus Torvalds 已提交
1708

1709 1710
	const struct header_ops *header_ops;

1711 1712 1713
	unsigned int		flags;
	unsigned int		priv_flags;

L
Linus Torvalds 已提交
1714
	unsigned short		gflags;
1715
	unsigned short		padded;
L
Linus Torvalds 已提交
1716

1717 1718
	unsigned char		operstate;
	unsigned char		link_mode;
S
Stefan Rompf 已提交
1719

1720 1721
	unsigned char		if_port;
	unsigned char		dma;
1722

1723
	unsigned int		mtu;
1724 1725
	unsigned int		min_mtu;
	unsigned int		max_mtu;
1726 1727
	unsigned short		type;
	unsigned short		hard_header_len;
L
Linus Torvalds 已提交
1728

1729 1730 1731
	unsigned short		needed_headroom;
	unsigned short		needed_tailroom;

L
Linus Torvalds 已提交
1732
	/* Interface address info. */
1733 1734 1735
	unsigned char		perm_addr[MAX_ADDR_LEN];
	unsigned char		addr_assign_type;
	unsigned char		addr_len;
1736
	unsigned short		neigh_priv_len;
1737 1738
	unsigned short          dev_id;
	unsigned short          dev_port;
J
Jiri Pirko 已提交
1739
	spinlock_t		addr_list_lock;
1740 1741
	unsigned char		name_assign_type;
	bool			uc_promisc;
1742 1743 1744 1745
	struct netdev_hw_addr_list	uc;
	struct netdev_hw_addr_list	mc;
	struct netdev_hw_addr_list	dev_addrs;

1746 1747 1748
#ifdef CONFIG_SYSFS
	struct kset		*queues_kset;
#endif
1749 1750
	unsigned int		promiscuity;
	unsigned int		allmulti;
L
Linus Torvalds 已提交
1751 1752


B
Bjorn Helgaas 已提交
1753
	/* Protocol-specific pointers */
1754

1755
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1756
	struct vlan_info __rcu	*vlan_info;
1757
#endif
1758
#if IS_ENABLED(CONFIG_NET_DSA)
1759
	struct dsa_switch_tree	*dsa_ptr;
1760 1761
#endif
#if IS_ENABLED(CONFIG_TIPC)
1762
	struct tipc_bearer __rcu *tipc_ptr;
1763
#endif
1764 1765 1766 1767 1768 1769
	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;
1770
	struct wpan_dev		*ieee802154_ptr;
R
Robert Shearman 已提交
1771 1772 1773
#if IS_ENABLED(CONFIG_MPLS_ROUTING)
	struct mpls_dev __rcu	*mpls_ptr;
#endif
L
Linus Torvalds 已提交
1774

1775
/*
E
Eric Dumazet 已提交
1776
 * Cache lines mostly used on receive path (including eth_type_trans())
1777
 */
1778
	unsigned long		last_rx;
1779

1780
	/* Interface address info used in eth_type_trans() */
1781
	unsigned char		*dev_addr;
1782

1783
#ifdef CONFIG_SYSFS
T
Tom Herbert 已提交
1784 1785 1786
	struct netdev_rx_queue	*_rx;

	unsigned int		num_rx_queues;
1787
	unsigned int		real_num_rx_queues;
E
Eric Dumazet 已提交
1788
#endif
T
Tom Herbert 已提交
1789

1790
	unsigned long		gro_flush_timeout;
1791 1792
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1793

1794
#ifdef CONFIG_NET_CLS_ACT
1795 1796
	struct tcf_proto __rcu  *ingress_cl_list;
#endif
1797
	struct netdev_queue __rcu *ingress_queue;
1798
#ifdef CONFIG_NETFILTER_INGRESS
1799
	struct nf_hook_entry __rcu *nf_hooks_ingress;
1800
#endif
1801

1802
	unsigned char		broadcast[MAX_ADDR_LEN];
1803 1804 1805 1806
#ifdef CONFIG_RFS_ACCEL
	struct cpu_rmap		*rx_cpu_rmap;
#endif
	struct hlist_node	index_hlist;
E
Eric Dumazet 已提交
1807 1808 1809 1810

/*
 * Cache lines mostly used on transmit path
 */
1811 1812
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
	unsigned int		num_tx_queues;
1813
	unsigned int		real_num_tx_queues;
1814
	struct Qdisc		*qdisc;
1815 1816 1817
#ifdef CONFIG_NET_SCHED
	DECLARE_HASHTABLE	(qdisc_hash, 4);
#endif
1818
	unsigned long		tx_queue_len;
1819
	spinlock_t		tx_global_lock;
1820
	int			watchdog_timeo;
E
Eric Dumazet 已提交
1821

T
Tom Herbert 已提交
1822
#ifdef CONFIG_XPS
E
Eric Dumazet 已提交
1823
	struct xps_dev_maps __rcu *xps_maps;
T
Tom Herbert 已提交
1824
#endif
D
Daniel Borkmann 已提交
1825 1826 1827
#ifdef CONFIG_NET_CLS_ACT
	struct tcf_proto __rcu  *egress_cl_list;
#endif
1828

1829 1830 1831
	/* These may be needed for future network-power-down code. */
	struct timer_list	watchdog_timer;

E
Eric Dumazet 已提交
1832
	int __percpu		*pcpu_refcnt;
L
Linus Torvalds 已提交
1833 1834
	struct list_head	todo_list;

1835
	struct list_head	link_watch_list;
1836

L
Linus Torvalds 已提交
1837
	enum { NETREG_UNINITIALIZED=0,
1838
	       NETREG_REGISTERED,	/* completed register_netdevice */
L
Linus Torvalds 已提交
1839 1840 1841
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1842
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1843 1844
	} reg_state:8;

1845
	bool dismantle;
1846 1847 1848 1849 1850

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
L
Linus Torvalds 已提交
1851

1852
	void (*destructor)(struct net_device *dev);
L
Linus Torvalds 已提交
1853 1854

#ifdef CONFIG_NETPOLL
1855
	struct netpoll_info __rcu	*npinfo;
L
Linus Torvalds 已提交
1856
#endif
1857

1858
	possible_net_t			nd_net;
1859

D
David S. Miller 已提交
1860
	/* mid-layer private */
E
Eric Dumazet 已提交
1861
	union {
1862 1863
		void					*ml_priv;
		struct pcpu_lstats __percpu		*lstats;
1864
		struct pcpu_sw_netstats __percpu	*tstats;
1865 1866
		struct pcpu_dstats __percpu		*dstats;
		struct pcpu_vstats __percpu		*vstats;
E
Eric Dumazet 已提交
1867
	};
1868

E
Eric Dumazet 已提交
1869
	struct garp_port __rcu	*garp_port;
1870
	struct mrp_port __rcu	*mrp_port;
L
Linus Torvalds 已提交
1871

B
Bjorn Helgaas 已提交
1872
	struct device		dev;
1873
	const struct attribute_group *sysfs_groups[4];
1874
	const struct attribute_group *sysfs_rx_queue_group;
P
Patrick McHardy 已提交
1875 1876

	const struct rtnl_link_ops *rtnl_link_ops;
1877

1878 1879 1880
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1881 1882
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1883

J
Jeff Kirsher 已提交
1884
#ifdef CONFIG_DCB
1885
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1886
#endif
B
Bjorn Helgaas 已提交
1887 1888 1889
	u8			num_tc;
	struct netdev_tc_txq	tc_to_txq[TC_MAX_QUEUE];
	u8			prio_tc_map[TC_BITMASK + 1];
1890

1891
#if IS_ENABLED(CONFIG_FCOE)
1892
	unsigned int		fcoe_ddp_xid;
1893
#endif
1894
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1895
	struct netprio_map __rcu *priomap;
1896
#endif
B
Bjorn Helgaas 已提交
1897 1898
	struct phy_device	*phydev;
	struct lock_class_key	*qdisc_tx_busylock;
1899
	struct lock_class_key	*qdisc_running_key;
B
Bjorn Helgaas 已提交
1900
	bool			proto_down;
L
Linus Torvalds 已提交
1901
};
1902
#define to_net_dev(d) container_of(d, struct net_device, dev)
L
Linus Torvalds 已提交
1903 1904 1905

#define	NETDEV_ALIGN		32

1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
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;
}

1922
int netdev_txq_to_tc(struct net_device *dev, unsigned int txq);
1923 1924 1925
void netdev_reset_tc(struct net_device *dev);
int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset);
int netdev_set_num_tc(struct net_device *dev, u8 num_tc);
1926 1927 1928 1929 1930 1931 1932

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

1933 1934 1935 1936 1937 1938 1939
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
					 unsigned int index)
{
	return &dev->_tx[index];
}

1940 1941 1942 1943 1944 1945
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));
}

1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
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);
}

1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
#define netdev_lockdep_set_classes(dev)				\
{								\
	static struct lock_class_key qdisc_tx_busylock_key;	\
	static struct lock_class_key qdisc_running_key;		\
	static struct lock_class_key qdisc_xmit_lock_key;	\
	static struct lock_class_key dev_addr_list_lock_key;	\
	unsigned int i;						\
								\
	(dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key;	\
	(dev)->qdisc_running_key = &qdisc_running_key;		\
	lockdep_set_class(&(dev)->addr_list_lock,		\
			  &dev_addr_list_lock_key); 		\
	for (i = 0; i < (dev)->num_tx_queues; i++)		\
		lockdep_set_class(&(dev)->_tx[i]._xmit_lock,	\
				  &qdisc_xmit_lock_key);	\
}

1975
struct netdev_queue *netdev_pick_tx(struct net_device *dev,
1976 1977
				    struct sk_buff *skb,
				    void *accel_priv);
1978

1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
/* returns the headroom that the master device needs to take in account
 * when forwarding to this dev
 */
static inline unsigned netdev_get_fwd_headroom(struct net_device *dev)
{
	return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom;
}

static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr)
{
	if (dev->netdev_ops->ndo_set_rx_headroom)
		dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr);
}

/* set the device rx headroom to the dev's default */
static inline void netdev_reset_rx_headroom(struct net_device *dev)
{
	netdev_set_rx_headroom(dev, -1);
}

1999 2000 2001 2002 2003 2004
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
Eric Dumazet 已提交
2005
	return read_pnet(&dev->nd_net);
2006 2007 2008
}

static inline
2009
void dev_net_set(struct net_device *dev, struct net *net)
2010
{
2011
	write_pnet(&dev->nd_net, net);
2012 2013
}

2014
static inline bool netdev_uses_dsa(struct net_device *dev)
2015
{
2016
#if IS_ENABLED(CONFIG_NET_DSA)
2017 2018
	if (dev->dsa_ptr != NULL)
		return dsa_uses_tagged_protocol(dev->dsa_ptr);
2019
#endif
2020
	return false;
2021 2022
}

2023 2024 2025 2026 2027 2028
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
2029
static inline void *netdev_priv(const struct net_device *dev)
L
Linus Torvalds 已提交
2030
{
2031
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
L
Linus Torvalds 已提交
2032 2033 2034 2035 2036
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
2037
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
L
Linus Torvalds 已提交
2038

2039
/* Set the sysfs device type for the network logical device to allow
2040
 * fine-grained identification of different network device types. For
B
Bjorn Helgaas 已提交
2041
 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc.
2042 2043 2044
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

E
Eric Dumazet 已提交
2045 2046 2047 2048 2049
/* Default NAPI poll() weight
 * Device drivers are strongly advised to not use bigger value
 */
#define NAPI_POLL_WEIGHT 64

2050
/**
B
Bjorn Helgaas 已提交
2051
 *	netif_napi_add - initialize a NAPI context
2052
 *	@dev:  network device
B
Bjorn Helgaas 已提交
2053
 *	@napi: NAPI context
2054 2055 2056
 *	@poll: polling function
 *	@weight: default weight
 *
B
Bjorn Helgaas 已提交
2057 2058
 * netif_napi_add() must be used to initialize a NAPI context prior to calling
 * *any* of the other NAPI-related functions.
2059
 */
2060 2061
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
2062

E
Eric Dumazet 已提交
2063
/**
B
Bjorn Helgaas 已提交
2064
 *	netif_tx_napi_add - initialize a NAPI context
E
Eric Dumazet 已提交
2065
 *	@dev:  network device
B
Bjorn Helgaas 已提交
2066
 *	@napi: NAPI context
E
Eric Dumazet 已提交
2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082
 *	@poll: polling function
 *	@weight: default weight
 *
 * This variant of netif_napi_add() should be used from drivers using NAPI
 * to exclusively poll a TX queue.
 * This will avoid we add it into napi_hash[], thus polluting this hash table.
 */
static inline void netif_tx_napi_add(struct net_device *dev,
				     struct napi_struct *napi,
				     int (*poll)(struct napi_struct *, int),
				     int weight)
{
	set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state);
	netif_napi_add(dev, napi, poll, weight);
}

2083
/**
B
Bjorn Helgaas 已提交
2084 2085
 *  netif_napi_del - remove a NAPI context
 *  @napi: NAPI context
2086
 *
B
Bjorn Helgaas 已提交
2087
 *  netif_napi_del() removes a NAPI context from the network device NAPI list
2088
 */
2089 2090 2091
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
2092
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
B
Bjorn Helgaas 已提交
2093
	void	*frag0;
2094

2095 2096 2097
	/* Length of frag0. */
	unsigned int frag0_len;

2098
	/* This indicates where we are processing relative to skb->data. */
B
Bjorn Helgaas 已提交
2099
	int	data_offset;
2100

2101
	/* This is non-zero if the packet cannot be merged with the new skb. */
2102 2103 2104 2105
	u16	flush;

	/* Save the IP ID here and check when we get to the transport layer */
	u16	flush_id;
2106 2107

	/* Number of segments aggregated. */
2108 2109
	u16	count;

2110 2111 2112
	/* Start offset for remote checksum offload */
	u16	gro_remcsum_start;

2113 2114
	/* jiffies when first packet was created/queued */
	unsigned long age;
2115

T
Tom Herbert 已提交
2116
	/* Used in ipv6_gro_receive() and foo-over-udp */
2117 2118
	u16	proto;

2119 2120 2121
	/* This is non-zero if the packet may be of the same flow. */
	u8	same_flow:1;

2122 2123
	/* Used in tunnel GRO receive */
	u8	encap_mark:1;
T
Tom Herbert 已提交
2124 2125 2126 2127

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

2128 2129
	/* Number of checksums via CHECKSUM_UNNECESSARY */
	u8	csum_cnt:3;
2130

2131 2132 2133 2134 2135
	/* Free the skb? */
	u8	free:2;
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2

2136 2137 2138
	/* Used in foo-over-udp, set in udp[46]_gro_receive */
	u8	is_ipv6:1;

2139 2140 2141
	/* Used in GRE, set in fou/gue_gro_receive */
	u8	is_fou:1;

2142 2143 2144
	/* Used to determine if flush_id can be ignored */
	u8	is_atomic:1;

S
Sabrina Dubroca 已提交
2145 2146 2147 2148
	/* Number of gro_receive callbacks this packet already went through */
	u8 recursion_counter:4;

	/* 1 bit hole */
2149

2150 2151 2152
	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
	__wsum	csum;

2153 2154
	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
2155 2156 2157
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
2158

S
Sabrina Dubroca 已提交
2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192
#define GRO_RECURSION_LIMIT 15
static inline int gro_recursion_inc_test(struct sk_buff *skb)
{
	return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT;
}

typedef struct sk_buff **(*gro_receive_t)(struct sk_buff **, struct sk_buff *);
static inline struct sk_buff **call_gro_receive(gro_receive_t cb,
						struct sk_buff **head,
						struct sk_buff *skb)
{
	if (unlikely(gro_recursion_inc_test(skb))) {
		NAPI_GRO_CB(skb)->flush |= 1;
		return NULL;
	}

	return cb(head, skb);
}

typedef struct sk_buff **(*gro_receive_sk_t)(struct sock *, struct sk_buff **,
					     struct sk_buff *);
static inline struct sk_buff **call_gro_receive_sk(gro_receive_sk_t cb,
						   struct sock *sk,
						   struct sk_buff **head,
						   struct sk_buff *skb)
{
	if (unlikely(gro_recursion_inc_test(skb))) {
		NAPI_GRO_CB(skb)->flush |= 1;
		return NULL;
	}

	return cb(sk, head, skb);
}

L
Linus Torvalds 已提交
2193
struct packet_type {
D
David S. Miller 已提交
2194 2195 2196 2197 2198 2199
	__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 *);
2200 2201
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
L
Linus Torvalds 已提交
2202 2203 2204 2205
	void			*af_packet_priv;
	struct list_head	list;
};

2206
struct offload_callbacks {
2207
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
2208
						netdev_features_t features);
2209
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
2210
						 struct sk_buff *skb);
2211
	int			(*gro_complete)(struct sk_buff *skb, int nhoff);
2212 2213 2214 2215
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
2216
	u16			 priority;
2217 2218
	struct offload_callbacks callbacks;
	struct list_head	 list;
L
Linus Torvalds 已提交
2219 2220
};

B
Bjorn Helgaas 已提交
2221
/* often modified stats are per-CPU, other are shared (netdev->stats) */
2222 2223 2224 2225 2226 2227 2228 2229
struct pcpu_sw_netstats {
	u64     rx_packets;
	u64     rx_bytes;
	u64     tx_packets;
	u64     tx_bytes;
	struct u64_stats_sync   syncp;
};

2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241
#define __netdev_alloc_pcpu_stats(type, gfp)				\
({									\
	typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\
	if (pcpu_stats)	{						\
		int __cpu;						\
		for_each_possible_cpu(__cpu) {				\
			typeof(type) *stat;				\
			stat = per_cpu_ptr(pcpu_stats, __cpu);		\
			u64_stats_init(&stat->syncp);			\
		}							\
	}								\
	pcpu_stats;							\
2242 2243
})

2244
#define netdev_alloc_pcpu_stats(type)					\
2245
	__netdev_alloc_pcpu_stats(type, GFP_KERNEL)
2246

2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259
enum netdev_lag_tx_type {
	NETDEV_LAG_TX_TYPE_UNKNOWN,
	NETDEV_LAG_TX_TYPE_RANDOM,
	NETDEV_LAG_TX_TYPE_BROADCAST,
	NETDEV_LAG_TX_TYPE_ROUNDROBIN,
	NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
	NETDEV_LAG_TX_TYPE_HASH,
};

struct netdev_lag_upper_info {
	enum netdev_lag_tx_type tx_type;
};

2260 2261 2262 2263 2264
struct netdev_lag_lower_state_info {
	u8 link_up : 1,
	   tx_enabled : 1;
};

L
Linus Torvalds 已提交
2265 2266
#include <linux/notifier.h>

2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279
/* 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
2280
#define NETDEV_CHANGEMTU	0x0007 /* notify after mtu change happened */
2281 2282 2283 2284 2285 2286 2287 2288 2289
#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
2290
#define NETDEV_UNREGISTER_FINAL 0x0011
2291 2292 2293
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014
2294
#define NETDEV_CHANGEUPPER	0x0015
2295
#define NETDEV_RESEND_IGMP	0x0016
2296
#define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
2297
#define NETDEV_CHANGEINFODATA	0x0018
2298
#define NETDEV_BONDING_INFO	0x0019
2299
#define NETDEV_PRECHANGEUPPER	0x001A
2300
#define NETDEV_CHANGELOWERSTATE	0x001B
2301
#define NETDEV_UDP_TUNNEL_PUSH_INFO	0x001C
2302
#define NETDEV_CHANGE_TX_QUEUE_LEN	0x001E
2303

2304 2305
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);
2306 2307 2308 2309 2310

struct netdev_notifier_info {
	struct net_device *dev;
};

2311 2312 2313 2314 2315
struct netdev_notifier_change_info {
	struct netdev_notifier_info info; /* must be first */
	unsigned int flags_changed;
};

2316 2317 2318 2319
struct netdev_notifier_changeupper_info {
	struct netdev_notifier_info info; /* must be first */
	struct net_device *upper_dev; /* new upper dev */
	bool master; /* is upper dev master */
B
Bjorn Helgaas 已提交
2320
	bool linking; /* is the notification for link or unlink */
2321
	void *upper_info; /* upper dev info */
2322 2323
};

2324 2325 2326 2327 2328
struct netdev_notifier_changelowerstate_info {
	struct netdev_notifier_info info; /* must be first */
	void *lower_state_info; /* is lower dev state */
};

2329 2330 2331 2332 2333 2334
static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
					     struct net_device *dev)
{
	info->dev = dev;
}

2335 2336 2337 2338 2339 2340
static inline struct net_device *
netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
{
	return info->dev;
}

2341
int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
2342 2343


L
Linus Torvalds 已提交
2344 2345
extern rwlock_t				dev_base_lock;		/* Device list lock */

2346 2347
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
2348 2349
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
2350 2351
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
2352 2353 2354 2355
#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)
2356 2357
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
2358 2359
#define for_each_netdev_in_bond_rcu(bond, slave)	\
		for_each_netdev_rcu(&init_net, slave)	\
2360
			if (netdev_master_upper_dev_get_rcu(slave) == (bond))
2361
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
2362

2363 2364 2365 2366 2367
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

2368
	net = dev_net(dev);
2369 2370 2371 2372
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2373 2374 2375 2376 2377 2378
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
2379
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
2380 2381 2382
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2383 2384 2385 2386 2387
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);
}
2388

E
Eric Dumazet 已提交
2389 2390 2391 2392 2393 2394 2395
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);
}

2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407
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);

2408
int dev_get_iflink(const struct net_device *dev);
2409
int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
2410 2411
struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
				      unsigned short mask);
2412 2413 2414 2415 2416 2417
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);
2418
int dev_close_many(struct list_head *head, bool unlink);
2419
void dev_disable_lro(struct net_device *dev);
2420
int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb);
2421
int dev_queue_xmit(struct sk_buff *skb);
2422
int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
2423 2424 2425
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);
2426 2427 2428 2429 2430
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

2431 2432
int netdev_refcnt_read(const struct net_device *dev);
void free_netdev(struct net_device *dev);
2433
void netdev_freemem(struct net_device *dev);
2434 2435
void synchronize_net(void);
int init_dummy_netdev(struct net_device *dev);
2436

2437
DECLARE_PER_CPU(int, xmit_recursion);
2438 2439
#define XMIT_RECURSION_LIMIT	10

2440 2441 2442 2443 2444
static inline int dev_recursion_level(void)
{
	return this_cpu_read(xmit_recursion);
}

2445 2446 2447 2448 2449 2450
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);
2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466

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;
}

2467 2468
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
2469
{
2470 2471
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
2472

2473 2474 2475 2476
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
2477

2478 2479 2480
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
2481 2482 2483
	if (!pskb_may_pull(skb, hlen))
		return NULL;

2484 2485
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
2486
	return skb->data + offset;
2487
}
L
Linus Torvalds 已提交
2488

H
Herbert Xu 已提交
2489 2490
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
2491 2492
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
2493 2494
}

2495 2496 2497
static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
					const void *start, unsigned int len)
{
T
Tom Herbert 已提交
2498
	if (NAPI_GRO_CB(skb)->csum_valid)
2499 2500 2501 2502
		NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
						  csum_partial(start, len, 0));
}

T
Tom Herbert 已提交
2503 2504 2505 2506 2507 2508 2509
/* 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);

2510 2511
static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb)
{
2512
	return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb));
2513 2514
}

T
Tom Herbert 已提交
2515 2516 2517 2518
static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
						      bool zero_okay,
						      __sum16 check)
{
2519 2520 2521
	return ((skb->ip_summed != CHECKSUM_PARTIAL ||
		skb_checksum_start_offset(skb) <
		 skb_gro_offset(skb)) &&
2522
		!skb_at_gro_remcsum_start(skb) &&
2523
		NAPI_GRO_CB(skb)->csum_cnt == 0 &&
T
Tom Herbert 已提交
2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
		(!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)
{
2541 2542 2543 2544 2545 2546 2547 2548 2549
	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
2550 2551 2552 2553 2554 2555 2556 2557 2558 2559
	}
}

#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));		\
2560 2561 2562
	if (__ret)							\
		__skb_mark_checksum_bad(skb);				\
	else								\
T
Tom Herbert 已提交
2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
		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)

2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596
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)

2597 2598 2599 2600 2601 2602 2603
struct gro_remcsum {
	int offset;
	__wsum delta;
};

static inline void skb_gro_remcsum_init(struct gro_remcsum *grc)
{
2604
	grc->offset = 0;
2605 2606 2607
	grc->delta = 0;
}

2608 2609 2610 2611 2612
static inline void *skb_gro_remcsum_process(struct sk_buff *skb, void *ptr,
					    unsigned int off, size_t hdrlen,
					    int start, int offset,
					    struct gro_remcsum *grc,
					    bool nopartial)
2613 2614
{
	__wsum delta;
2615
	size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start);
2616 2617 2618

	BUG_ON(!NAPI_GRO_CB(skb)->csum_valid);

2619
	if (!nopartial) {
2620 2621 2622 2623 2624 2625 2626 2627 2628
		NAPI_GRO_CB(skb)->gro_remcsum_start = off + hdrlen + start;
		return ptr;
	}

	ptr = skb_gro_header_fast(skb, off);
	if (skb_gro_header_hard(skb, off + plen)) {
		ptr = skb_gro_header_slow(skb, off + plen, off);
		if (!ptr)
			return NULL;
2629 2630
	}

2631 2632
	delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum,
			       start, offset);
2633 2634 2635

	/* Adjust skb->csum since we changed the packet */
	NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
2636

2637
	grc->offset = off + hdrlen + offset;
2638
	grc->delta = delta;
2639 2640

	return ptr;
2641 2642
}

2643 2644 2645
static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb,
					   struct gro_remcsum *grc)
{
2646 2647 2648
	void *ptr;
	size_t plen = grc->offset + sizeof(u16);

2649 2650 2651
	if (!grc->delta)
		return;

2652 2653 2654 2655 2656 2657 2658 2659
	ptr = skb_gro_header_fast(skb, grc->offset);
	if (skb_gro_header_hard(skb, grc->offset + sizeof(u16))) {
		ptr = skb_gro_header_slow(skb, plen, grc->offset);
		if (!ptr)
			return;
	}

	remcsum_unadjust((__sum16 *)ptr, grc->delta);
2660
}
2661

2662 2663
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
2664
				  const void *daddr, const void *saddr,
2665
				  unsigned int len)
2666
{
2667
	if (!dev->header_ops || !dev->header_ops->create)
2668
		return 0;
2669 2670

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
2671 2672
}

S
Stephen Hemminger 已提交
2673 2674 2675 2676 2677
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

2678
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
2679
		return 0;
2680
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
2681 2682
}

2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700
/* ll_header must have at least hard_header_len allocated */
static inline bool dev_validate_header(const struct net_device *dev,
				       char *ll_header, int len)
{
	if (likely(len >= dev->hard_header_len))
		return true;

	if (capable(CAP_SYS_RAWIO)) {
		memset(ll_header + len, 0, dev->hard_header_len - len);
		return true;
	}

	if (dev->header_ops && dev->header_ops->validate)
		return dev->header_ops->validate(ll_header, len);

	return false;
}

L
Linus Torvalds 已提交
2701
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
2702
int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
L
Linus Torvalds 已提交
2703 2704 2705 2706 2707
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

2708
#ifdef CONFIG_NET_FLOW_LIMIT
2709
#define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720
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
2721
/*
B
Bjorn Helgaas 已提交
2722
 * Incoming packets are placed on per-CPU queues
L
Linus Torvalds 已提交
2723
 */
E
Eric Dumazet 已提交
2724
struct softnet_data {
L
Linus Torvalds 已提交
2725
	struct list_head	poll_list;
2726
	struct sk_buff_head	process_queue;
L
Linus Torvalds 已提交
2727

C
Changli Gao 已提交
2728
	/* stats */
2729 2730 2731
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		received_rps;
2732
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
2733
	struct softnet_data	*rps_ipi_list;
E
Eric Dumazet 已提交
2734 2735 2736 2737 2738 2739 2740
#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
2741

E
Eric Dumazet 已提交
2742
#ifdef CONFIG_RPS
2743 2744 2745 2746 2747 2748
	/* input_queue_head should be written by cpu owning this struct,
	 * and only read by other cpus. Worth using a cache line.
	 */
	unsigned int		input_queue_head ____cacheline_aligned_in_smp;

	/* Elements below can be accessed between CPUs for RPS/RFS */
T
Tom Herbert 已提交
2749
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
2750 2751
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
2752
	unsigned int		input_queue_tail;
2753
#endif
2754
	unsigned int		dropped;
T
Tom Herbert 已提交
2755
	struct sk_buff_head	input_pkt_queue;
2756
	struct napi_struct	backlog;
2757

L
Linus Torvalds 已提交
2758 2759
};

2760
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
2761 2762
{
#ifdef CONFIG_RPS
2763 2764 2765 2766 2767 2768 2769 2770 2771
	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
2772 2773 2774
#endif
}

T
Tom Herbert 已提交
2775
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
2776

2777
void __netif_schedule(struct Qdisc *q);
2778
void netif_schedule_queue(struct netdev_queue *txq);
2779

2780 2781 2782 2783 2784 2785 2786 2787
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));
}

2788
static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
2789
{
2790
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2791 2792
}

2793 2794 2795 2796 2797 2798
/**
 *	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
2799 2800
static inline void netif_start_queue(struct net_device *dev)
{
2801
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2802 2803
}

2804 2805 2806 2807 2808 2809 2810 2811 2812 2813
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);
	}
}

2814
void netif_tx_wake_queue(struct netdev_queue *dev_queue);
2815

2816 2817 2818 2819 2820 2821 2822
/**
 *	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.
 */
2823 2824
static inline void netif_wake_queue(struct net_device *dev)
{
2825
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2826 2827
}

2828 2829 2830 2831 2832 2833 2834 2835 2836 2837
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);
	}
}

2838
static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
2839
{
2840
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2841 2842
}

2843 2844 2845 2846 2847 2848 2849
/**
 *	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
2850 2851
static inline void netif_stop_queue(struct net_device *dev)
{
2852
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2853 2854
}

2855
void netif_tx_stop_all_queues(struct net_device *dev);
2856

2857
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2858
{
2859
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2860 2861
}

2862 2863 2864 2865 2866 2867
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
2868
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
2869
{
2870
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2871 2872
}

2873
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2874
{
2875 2876 2877
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

2878 2879
static inline bool
netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2880 2881 2882 2883
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

2884 2885 2886 2887 2888 2889
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;
}

2890 2891 2892 2893 2894
/**
 *	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(),
B
Bjorn Helgaas 已提交
2895
 * to give appropriate hint to the CPU.
2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908
 */
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,
B
Bjorn Helgaas 已提交
2909
 * to give appropriate hint to the CPU.
2910 2911 2912 2913 2914 2915 2916 2917
 */
static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
{
#ifdef CONFIG_BQL
	prefetchw(&dev_queue->dql.limit);
#endif
}

2918 2919 2920
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
2921 2922
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938

	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
2939
#endif
2940 2941
}

2942 2943 2944 2945 2946 2947 2948 2949 2950
/**
 * 	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
 */
2951 2952 2953 2954 2955 2956
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,
2957
					     unsigned int pkts, unsigned int bytes)
2958
{
T
Tom Herbert 已提交
2959
#ifdef CONFIG_BQL
2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976
	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
2977
#endif
2978 2979
}

2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
/**
 * 	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()
 */
2990
static inline void netdev_completed_queue(struct net_device *dev,
2991
					  unsigned int pkts, unsigned int bytes)
2992 2993 2994 2995 2996 2997
{
	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
2998
#ifdef CONFIG_BQL
2999
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
3000 3001
	dql_reset(&q->dql);
#endif
3002 3003
}

3004 3005 3006 3007 3008 3009 3010
/**
 * 	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
 */
3011 3012 3013
static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
3014 3015
}

3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035
/**
 * 	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;
}

3036 3037 3038 3039 3040 3041
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
3042
static inline bool netif_running(const struct net_device *dev)
L
Linus Torvalds 已提交
3043 3044 3045 3046
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

3047
/*
B
Bjorn Helgaas 已提交
3048
 * Routines to manage the subqueues on a device.  We only need start,
3049 3050 3051 3052
 * 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.
 */
3053 3054 3055 3056 3057 3058 3059 3060

/**
 *	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.
 */
3061 3062
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
3063
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3064 3065

	netif_tx_start_queue(txq);
3066 3067
}

3068 3069 3070 3071 3072 3073 3074
/**
 *	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.
 */
3075 3076
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
3077
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3078
	netif_tx_stop_queue(txq);
3079 3080
}

3081 3082 3083 3084 3085 3086 3087
/**
 *	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.
 */
3088 3089
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
3090
{
3091
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3092 3093

	return netif_tx_queue_stopped(txq);
3094 3095
}

3096 3097
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
3098 3099 3100
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
3101

3102
void netif_wake_subqueue(struct net_device *dev, u16 queue_index);
3103

3104
#ifdef CONFIG_XPS
3105
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
3106
			u16 index);
3107 3108
#else
static inline int netif_set_xps_queue(struct net_device *dev,
3109
				      const struct cpumask *mask,
3110 3111 3112 3113 3114 3115
				      u16 index)
{
	return 0;
}
#endif

J
Jiri Pirko 已提交
3116 3117 3118
u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
		  unsigned int num_tx_queues);

3119 3120 3121 3122 3123
/*
 * 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,
3124
			      struct sk_buff *skb)
3125 3126 3127 3128
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

3129 3130 3131 3132 3133 3134
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
3135
static inline bool netif_is_multiqueue(const struct net_device *dev)
3136
{
E
Eric Dumazet 已提交
3137
	return dev->num_tx_queues > 1;
3138
}
L
Linus Torvalds 已提交
3139

3140
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
3141

3142
#ifdef CONFIG_SYSFS
3143
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
3144 3145 3146 3147 3148 3149 3150 3151
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
#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

3164
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
3165
int netif_get_num_default_rss_queues(void);
3166

3167 3168 3169 3170 3171 3172 3173
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
3174

3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192
/*
 * 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
3193
 */
3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212
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
3213

3214 3215
int netif_rx(struct sk_buff *skb);
int netif_rx_ni(struct sk_buff *skb);
3216
int netif_receive_skb(struct sk_buff *skb);
3217 3218 3219 3220
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);
3221 3222
struct packet_offload *gro_find_receive_by_type(__be16 type);
struct packet_offload *gro_find_complete_by_type(__be16 type);
3223 3224 3225 3226 3227 3228 3229

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

M
Mahesh Bandewar 已提交
3230
bool netdev_is_rx_handler_busy(struct net_device *dev);
3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
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);
3242 3243
void __dev_notify_flags(struct net_device *, unsigned int old_flags,
			unsigned int gchanges);
3244 3245 3246 3247 3248 3249 3250 3251
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,
3252
			 struct netdev_phys_item_id *ppid);
3253 3254
int dev_get_phys_port_name(struct net_device *dev,
			   char *name, size_t len);
3255
int dev_change_proto_down(struct net_device *dev, bool proto_down);
3256
int dev_change_xdp_fd(struct net_device *dev, int fd);
3257
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev);
3258 3259
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
3260
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3261
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3262 3263
bool is_skb_forwardable(const struct net_device *dev,
			const struct sk_buff *skb);
L
Linus Torvalds 已提交
3264

3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279
static __always_inline int ____dev_forward_skb(struct net_device *dev,
					       struct sk_buff *skb)
{
	if (skb_orphan_frags(skb, GFP_ATOMIC) ||
	    unlikely(!is_skb_forwardable(dev, skb))) {
		atomic_long_inc(&dev->rx_dropped);
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	skb_scrub_packet(skb, true);
	skb->priority = 0;
	return 0;
}

3280 3281
void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);

3282
extern int		netdev_budget;
L
Linus Torvalds 已提交
3283 3284

/* Called by rtnetlink.c:rtnl_unlock() */
3285
void netdev_run_todo(void);
L
Linus Torvalds 已提交
3286

3287 3288 3289 3290
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
3291
 * Release reference to device to allow it to be freed.
3292
 */
L
Linus Torvalds 已提交
3293 3294
static inline void dev_put(struct net_device *dev)
{
3295
	this_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
3296 3297
}

3298 3299 3300 3301
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
3302
 * Hold reference to device to keep it from being freed.
3303
 */
3304 3305
static inline void dev_hold(struct net_device *dev)
{
3306
	this_cpu_inc(*dev->pcpu_refcnt);
3307
}
L
Linus Torvalds 已提交
3308 3309 3310 3311

/* 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
3312 3313 3314 3315
 *
 * 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
3316 3317
 */

3318 3319 3320
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
3321

3322 3323 3324 3325 3326 3327
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
3328
static inline bool netif_carrier_ok(const struct net_device *dev)
L
Linus Torvalds 已提交
3329 3330 3331 3332
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

3333
unsigned long dev_trans_start(struct net_device *dev);
3334

3335
void __netdev_watchdog_up(struct net_device *dev);
L
Linus Torvalds 已提交
3336

3337
void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
3338

3339
void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
3340

3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352
/**
 *	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
3353 3354 3355 3356 3357 3358
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

3359 3360 3361 3362 3363 3364
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
3365 3366 3367 3368 3369 3370
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

3371 3372 3373 3374 3375 3376
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
3377
static inline bool netif_dormant(const struct net_device *dev)
S
Stefan Rompf 已提交
3378 3379 3380 3381 3382
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


3383 3384 3385 3386 3387 3388
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
3389
static inline bool netif_oper_up(const struct net_device *dev)
E
Eric Dumazet 已提交
3390
{
S
Stefan Rompf 已提交
3391 3392 3393 3394
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

3395 3396 3397 3398 3399 3400
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
3401
static inline bool netif_device_present(struct net_device *dev)
L
Linus Torvalds 已提交
3402 3403 3404 3405
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

3406
void netif_device_detach(struct net_device *dev);
L
Linus Torvalds 已提交
3407

3408
void netif_device_attach(struct net_device *dev);
L
Linus Torvalds 已提交
3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458

/*
 * 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;
}

3459
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
3460
{
3461 3462
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
3463 3464
}

3465 3466 3467 3468 3469 3470
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

3471
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
3472
{
3473
	bool ok = spin_trylock(&txq->_xmit_lock);
3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490
	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
3491 3492 3493 3494 3495 3496
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

3497 3498 3499
/* legacy drivers only, netdev_start_xmit() sets txq->trans_start */
static inline void netif_trans_update(struct net_device *dev)
{
F
Florian Westphal 已提交
3500 3501 3502 3503
	struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);

	if (txq->trans_start != jiffies)
		txq->trans_start = jiffies;
3504 3505
}

3506 3507 3508 3509 3510 3511
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
3512 3513
static inline void netif_tx_lock(struct net_device *dev)
{
3514
	unsigned int i;
3515
	int cpu;
3516

3517 3518
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
3519 3520
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3521 3522 3523 3524 3525 3526 3527

		/* 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.
		 */
3528
		__netif_tx_lock(txq, cpu);
3529 3530
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
3531
	}
H
Herbert Xu 已提交
3532 3533 3534 3535
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
3536 3537
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
3538 3539 3540 3541
}

static inline void netif_tx_unlock(struct net_device *dev)
{
3542 3543 3544 3545
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3546

3547 3548 3549 3550 3551
		/* 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);
3552
		netif_schedule_queue(txq);
3553 3554
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
3555 3556 3557 3558
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
3559 3560
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
3561 3562
}

3563
#define HARD_TX_LOCK(dev, txq, cpu) {			\
3564
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3565
		__netif_tx_lock(txq, cpu);		\
3566 3567 3568
	}						\
}

3569 3570 3571 3572 3573
#define HARD_TX_TRYLOCK(dev, txq)			\
	(((dev->features & NETIF_F_LLTX) == 0) ?	\
		__netif_tx_trylock(txq) :		\
		true )

3574
#define HARD_TX_UNLOCK(dev, txq) {			\
3575
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3576
		__netif_tx_unlock(txq);			\
3577 3578 3579
	}						\
}

L
Linus Torvalds 已提交
3580 3581
static inline void netif_tx_disable(struct net_device *dev)
{
3582
	unsigned int i;
3583
	int cpu;
3584

3585 3586
	local_bh_disable();
	cpu = smp_processor_id();
3587 3588
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3589 3590

		__netif_tx_lock(txq, cpu);
3591
		netif_tx_stop_queue(txq);
3592
		__netif_tx_unlock(txq);
3593
	}
3594
	local_bh_enable();
L
Linus Torvalds 已提交
3595 3596
}

3597 3598 3599 3600 3601
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

3602 3603
static inline void netif_addr_lock_nested(struct net_device *dev)
{
3604 3605 3606 3607 3608 3609
	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);
3610 3611
}

3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626
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);
}

3627
/*
3628
 * dev_addrs walker. Should be used only for read access. Call with
3629 3630 3631
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
3632
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
3633

L
Linus Torvalds 已提交
3634 3635
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

3636
void ether_setup(struct net_device *dev);
L
Linus Torvalds 已提交
3637 3638

/* Support for loadable net-drivers */
3639
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
3640
				    unsigned char name_assign_type,
3641 3642
				    void (*setup)(struct net_device *),
				    unsigned int txqs, unsigned int rxqs);
3643 3644
#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
3645

3646 3647 3648
#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
3649

3650 3651
int register_netdev(struct net_device *dev);
void unregister_netdev(struct net_device *dev);
3652

3653
/* General hardware address lists handling functions */
3654 3655 3656 3657
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);
3658 3659 3660 3661 3662 3663 3664 3665 3666
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 *));
3667
void __hw_addr_init(struct netdev_hw_addr_list *list);
3668

3669
/* Functions used for device addresses handling */
3670 3671 3672 3673 3674 3675
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);
3676 3677

/* Functions used for unicast addresses handling */
3678 3679 3680 3681 3682 3683 3684 3685
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);
3686

3687 3688 3689 3690 3691 3692 3693 3694
/**
 *  __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.
B
Bjorn Helgaas 已提交
3695
 */
3696 3697 3698 3699 3700 3701 3702 3703 3704 3705
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);
}

/**
3706
 *  __dev_uc_unsync - Remove synchronized addresses from device
3707 3708 3709 3710
 *  @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().
B
Bjorn Helgaas 已提交
3711
 */
3712 3713 3714 3715 3716 3717 3718
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);
}

3719
/* Functions used for multicast addresses handling */
3720 3721 3722 3723 3724 3725 3726 3727 3728 3729
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);
3730

3731 3732 3733 3734 3735 3736 3737 3738
/**
 *  __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.
B
Bjorn Helgaas 已提交
3739
 */
3740 3741 3742 3743 3744 3745 3746 3747 3748 3749
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);
}

/**
3750
 *  __dev_mc_unsync - Remove synchronized addresses from device
3751 3752 3753 3754
 *  @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().
B
Bjorn Helgaas 已提交
3755
 */
3756 3757 3758 3759 3760 3761 3762
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);
}

3763
/* Functions used for secondary unicast and multicast support */
3764 3765 3766 3767 3768 3769 3770
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
3771
/* Load a device via the kmod */
3772 3773 3774 3775 3776
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);
3777

L
Linus Torvalds 已提交
3778
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
3779
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
3780
extern int		weight_p;
J
Jiri Pirko 已提交
3781

3782
bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
3783 3784
struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3785 3786
struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3787

3788 3789 3790 3791 3792 3793 3794
/* 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)))

3795 3796 3797 3798 3799 3800 3801 3802
int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
				  int (*fn)(struct net_device *upper_dev,
					    void *data),
				  void *data);

bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
				  struct net_device *upper_dev);

3803 3804 3805 3806
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);
3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819

#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)))

3820 3821
void *netdev_lower_get_next(struct net_device *dev,
				struct list_head **iter);
3822

3823
#define netdev_for_each_lower_dev(dev, ldev, iter) \
3824
	for (iter = (dev)->adj_list.lower.next, \
3825 3826 3827 3828
	     ldev = netdev_lower_get_next(dev, &(iter)); \
	     ldev; \
	     ldev = netdev_lower_get_next(dev, &(iter)))

3829 3830 3831 3832 3833
struct net_device *netdev_all_lower_get_next(struct net_device *dev,
					     struct list_head **iter);
struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev,
						 struct list_head **iter);

3834 3835 3836 3837 3838 3839 3840 3841 3842
int netdev_walk_all_lower_dev(struct net_device *dev,
			      int (*fn)(struct net_device *lower_dev,
					void *data),
			      void *data);
int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
				  int (*fn)(struct net_device *lower_dev,
					    void *data),
				  void *data);

3843
void *netdev_adjacent_get_private(struct list_head *adj_list);
3844
void *netdev_lower_get_first_private_rcu(struct net_device *dev);
3845 3846 3847 3848
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,
3849
				 struct net_device *upper_dev,
3850
				 void *upper_priv, void *upper_info);
3851 3852
void netdev_upper_dev_unlink(struct net_device *dev,
			     struct net_device *upper_dev);
3853
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
3854 3855
void *netdev_lower_dev_get_private(struct net_device *dev,
				   struct net_device *lower_dev);
3856 3857
void netdev_lower_state_changed(struct net_device *lower_dev,
				void *lower_state_info);
3858 3859 3860 3861
int netdev_default_l2upper_neigh_construct(struct net_device *dev,
					   struct neighbour *n);
void netdev_default_l2upper_neigh_destroy(struct net_device *dev,
					  struct neighbour *n);
3862 3863 3864

/* RSS keys are 40 or 52 bytes long */
#define NETDEV_RSS_KEY_LEN 52
3865
extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
3866 3867
void netdev_rss_key_fill(void *buffer, size_t len);

3868
int dev_get_nest_level(struct net_device *dev);
3869 3870 3871 3872 3873
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);
3874

3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887
struct netdev_bonding_info {
	ifslave	slave;
	ifbond	master;
};

struct netdev_notifier_bonding_info {
	struct netdev_notifier_info info; /* must be first */
	struct netdev_bonding_info  bonding_info;
};

void netdev_bonding_info_change(struct net_device *dev,
				struct netdev_bonding_info *bonding_info);

3888 3889 3890 3891 3892
static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
	return __skb_gso_segment(skb, features, true);
}
3893
__be16 skb_network_protocol(struct sk_buff *skb, int *depth);
3894 3895 3896 3897

static inline bool can_checksum_protocol(netdev_features_t features,
					 __be16 protocol)
{
3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915
	if (protocol == htons(ETH_P_FCOE))
		return !!(features & NETIF_F_FCOE_CRC);

	/* Assume this is an IP checksum (not SCTP CRC) */

	if (features & NETIF_F_HW_CSUM) {
		/* Can checksum everything */
		return true;
	}

	switch (protocol) {
	case htons(ETH_P_IP):
		return !!(features & NETIF_F_IP_CSUM);
	case htons(ETH_P_IPV6):
		return !!(features & NETIF_F_IPV6_CSUM);
	default:
		return false;
	}
3916
}
3917

3918
#ifdef CONFIG_BUG
3919
void netdev_rx_csum_fault(struct net_device *dev);
3920 3921 3922 3923 3924
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
L
Linus Torvalds 已提交
3925
/* rx skb timestamps */
3926 3927
void net_enable_timestamp(void);
void net_disable_timestamp(void);
L
Linus Torvalds 已提交
3928

3929
#ifdef CONFIG_PROC_FS
3930
int __init dev_proc_init(void);
3931 3932
#else
#define dev_proc_init() 0
3933 3934
#endif

D
David S. Miller 已提交
3935
static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
3936 3937
					      struct sk_buff *skb, struct net_device *dev,
					      bool more)
D
David S. Miller 已提交
3938
{
3939
	skb->xmit_more = more ? 1 : 0;
3940
	return ops->ndo_start_xmit(skb, dev);
D
David S. Miller 已提交
3941 3942
}

3943
static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
3944
					    struct netdev_queue *txq, bool more)
D
David S. Miller 已提交
3945 3946
{
	const struct net_device_ops *ops = dev->netdev_ops;
3947
	int rc;
D
David S. Miller 已提交
3948

3949
	rc = __netdev_start_xmit(ops, skb, dev, more);
3950 3951 3952 3953
	if (rc == NETDEV_TX_OK)
		txq_trans_update(txq);

	return rc;
D
David S. Miller 已提交
3954 3955
}

3956 3957 3958 3959
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);
3960 3961 3962 3963 3964 3965 3966 3967 3968 3969

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);
}
3970

3971 3972
extern struct kobj_ns_type_operations net_ns_type_operations;

3973
const char *netdev_drivername(const struct net_device *dev);
3974

3975
void linkwatch_run_queue(void);
3976

3977 3978 3979
static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
							  netdev_features_t f2)
{
3980 3981
	if ((f1 ^ f2) & NETIF_F_HW_CSUM) {
		if (f1 & NETIF_F_HW_CSUM)
3982
			f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3983
		else
3984
			f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3985
	}
3986

3987
	return f1 & f2;
3988 3989
}

3990 3991
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
3992 3993 3994
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
3995 3996
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007

/* 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);
}

4008
int __netdev_update_features(struct net_device *dev);
4009
void netdev_update_features(struct net_device *dev);
4010
void netdev_change_features(struct net_device *dev);
4011

4012 4013 4014
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

4015 4016 4017
netdev_features_t passthru_features_check(struct sk_buff *skb,
					  struct net_device *dev,
					  netdev_features_t features);
4018
netdev_features_t netif_skb_features(struct sk_buff *skb);
4019

4020
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
4021
{
4022
	netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT;
4023 4024 4025 4026 4027 4028

	/* 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));
4029
	BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT));
4030 4031
	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));
4032 4033
	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));
4034 4035
	BUILD_BUG_ON(SKB_GSO_IPXIP4  != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_IPXIP6  != (NETIF_F_GSO_IPXIP6 >> NETIF_F_GSO_SHIFT));
4036 4037
	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));
4038
	BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT));
4039
	BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
M
Marcelo Ricardo Leitner 已提交
4040
	BUILD_BUG_ON(SKB_GSO_SCTP    != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT));
4041

4042
	return (features & feature) == feature;
4043 4044
}

4045
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
4046
{
H
Herbert Xu 已提交
4047
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
4048
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
4049 4050
}

4051
static inline bool netif_needs_gso(struct sk_buff *skb,
4052
				   netdev_features_t features)
4053
{
4054
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
4055 4056
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
4057 4058
}

4059 4060 4061 4062 4063 4064
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077
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;
}

4078 4079 4080 4081 4082
static inline bool netif_is_macsec(const struct net_device *dev)
{
	return dev->priv_flags & IFF_MACSEC;
}

4083
static inline bool netif_is_macvlan(const struct net_device *dev)
4084 4085 4086 4087
{
	return dev->priv_flags & IFF_MACVLAN;
}

4088
static inline bool netif_is_macvlan_port(const struct net_device *dev)
4089 4090 4091 4092
{
	return dev->priv_flags & IFF_MACVLAN_PORT;
}

4093
static inline bool netif_is_ipvlan(const struct net_device *dev)
4094 4095 4096 4097
{
	return dev->priv_flags & IFF_IPVLAN_SLAVE;
}

4098
static inline bool netif_is_ipvlan_port(const struct net_device *dev)
4099 4100 4101 4102
{
	return dev->priv_flags & IFF_IPVLAN_MASTER;
}

4103
static inline bool netif_is_bond_master(const struct net_device *dev)
4104 4105 4106 4107
{
	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
}

4108
static inline bool netif_is_bond_slave(const struct net_device *dev)
J
Jiri Pirko 已提交
4109 4110 4111 4112
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

4113 4114 4115 4116 4117
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

4118
static inline bool netif_is_l3_master(const struct net_device *dev)
4119
{
4120
	return dev->priv_flags & IFF_L3MDEV_MASTER;
4121 4122
}

D
David Ahern 已提交
4123 4124 4125 4126 4127
static inline bool netif_is_l3_slave(const struct net_device *dev)
{
	return dev->priv_flags & IFF_L3MDEV_SLAVE;
}

4128 4129 4130 4131 4132
static inline bool netif_is_bridge_master(const struct net_device *dev)
{
	return dev->priv_flags & IFF_EBRIDGE;
}

4133 4134 4135 4136 4137
static inline bool netif_is_bridge_port(const struct net_device *dev)
{
	return dev->priv_flags & IFF_BRIDGE_PORT;
}

4138 4139 4140 4141 4142
static inline bool netif_is_ovs_master(const struct net_device *dev)
{
	return dev->priv_flags & IFF_OPENVSWITCH;
}

4143
static inline bool netif_is_team_master(const struct net_device *dev)
J
Jiri Pirko 已提交
4144 4145 4146 4147
{
	return dev->priv_flags & IFF_TEAM;
}

4148
static inline bool netif_is_team_port(const struct net_device *dev)
J
Jiri Pirko 已提交
4149 4150 4151 4152
{
	return dev->priv_flags & IFF_TEAM_PORT;
}

4153
static inline bool netif_is_lag_master(const struct net_device *dev)
J
Jiri Pirko 已提交
4154 4155 4156 4157
{
	return netif_is_bond_master(dev) || netif_is_team_master(dev);
}

4158
static inline bool netif_is_lag_port(const struct net_device *dev)
J
Jiri Pirko 已提交
4159 4160 4161 4162
{
	return netif_is_bond_slave(dev) || netif_is_team_port(dev);
}

4163 4164 4165 4166 4167
static inline bool netif_is_rxfh_configured(const struct net_device *dev)
{
	return dev->priv_flags & IFF_RXFH_CONFIGURED;
}

4168 4169 4170 4171 4172 4173
/* 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);
}

4174 4175 4176 4177 4178 4179 4180
/* return true if dev can't cope with mtu frames that need vlan tag insertion */
static inline bool netif_reduces_vlan_mtu(struct net_device *dev)
{
	/* TODO: reserve and use an additional IFF bit, if we get more users */
	return dev->priv_flags & IFF_MACSEC;
}

4181
extern struct pernet_operations __net_initdata loopback_net_ops;
4182

4183 4184 4185 4186 4187 4188
/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

static inline const char *netdev_name(const struct net_device *dev)
{
4189 4190
	if (!dev->name[0] || strchr(dev->name, '%'))
		return "(unnamed net_device)";
4191 4192 4193
	return dev->name;
}

4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208
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)";
}

4209
__printf(3, 4)
4210 4211
void netdev_printk(const char *level, const struct net_device *dev,
		   const char *format, ...);
4212
__printf(2, 3)
4213
void netdev_emerg(const struct net_device *dev, const char *format, ...);
4214
__printf(2, 3)
4215
void netdev_alert(const struct net_device *dev, const char *format, ...);
4216
__printf(2, 3)
4217
void netdev_crit(const struct net_device *dev, const char *format, ...);
4218
__printf(2, 3)
4219
void netdev_err(const struct net_device *dev, const char *format, ...);
4220
__printf(2, 3)
4221
void netdev_warn(const struct net_device *dev, const char *format, ...);
4222
__printf(2, 3)
4223
void netdev_notice(const struct net_device *dev, const char *format, ...);
4224
__printf(2, 3)
4225
void netdev_info(const struct net_device *dev, const char *format, ...);
4226

4227 4228 4229
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

4230
#if defined(CONFIG_DYNAMIC_DEBUG)
4231 4232
#define netdev_dbg(__dev, format, args...)			\
do {								\
4233
	dynamic_netdev_dbg(__dev, format, ##args);		\
4234
} while (0)
4235 4236 4237
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263
#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...)			\
4264 4265
	WARN(1, "netdevice: %s%s\n" format, netdev_name(dev),	\
	     netdev_reg_state(dev), ##args)
4266

4267 4268 4269 4270 4271 4272 4273 4274
/* 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)

4275 4276 4277 4278 4279 4280
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

4281
#define netif_emerg(priv, type, dev, fmt, args...)		\
4282
	netif_level(emerg, priv, type, dev, fmt, ##args)
4283
#define netif_alert(priv, type, dev, fmt, args...)		\
4284
	netif_level(alert, priv, type, dev, fmt, ##args)
4285
#define netif_crit(priv, type, dev, fmt, args...)		\
4286
	netif_level(crit, priv, type, dev, fmt, ##args)
4287
#define netif_err(priv, type, dev, fmt, args...)		\
4288
	netif_level(err, priv, type, dev, fmt, ##args)
4289
#define netif_warn(priv, type, dev, fmt, args...)		\
4290
	netif_level(warn, priv, type, dev, fmt, ##args)
4291
#define netif_notice(priv, type, dev, fmt, args...)		\
4292
	netif_level(notice, priv, type, dev, fmt, ##args)
4293
#define netif_info(priv, type, dev, fmt, args...)		\
4294
	netif_level(info, priv, type, dev, fmt, ##args)
4295

4296
#if defined(CONFIG_DYNAMIC_DEBUG)
4297 4298 4299
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
4300
		dynamic_netdev_dbg(netdev, format, ##args);	\
4301
} while (0)
4302 4303 4304
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
4305 4306 4307 4308 4309 4310 4311 4312 4313 4314
#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)
4315
#define netif_vdbg	netif_dbg
4316 4317 4318 4319
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
4320
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4321 4322 4323
	0;							\
})
#endif
4324

4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354
/*
 *	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)

4355
#endif	/* _LINUX_NETDEVICE_H */