netdevice.h 138.8 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/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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#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 <net/xdp.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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struct dsa_port;
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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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struct xdp_buff;
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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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extern struct static_key rfs_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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	unsigned int	hh_len;
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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
	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_MISSED,	/* reschedule a napi */
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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 {
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	NAPIF_STATE_SCHED	 = BIT(NAPI_STATE_SCHED),
	NAPIF_STATE_MISSED	 = BIT(NAPI_STATE_MISSED),
	NAPIF_STATE_DISABLE	 = BIT(NAPI_STATE_DISABLE),
	NAPIF_STATE_NPSVC	 = BIT(NAPI_STATE_NPSVC),
	NAPIF_STATE_HASHED	 = BIT(NAPI_STATE_HASHED),
	NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL),
	NAPIF_STATE_IN_BUSY_POLL = BIT(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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	GRO_CONSUMED,
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};
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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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bool napi_schedule_prep(struct napi_struct *n);
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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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bool 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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 * Return false if device should avoid rearming interrupts.
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 */
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static inline bool napi_complete(struct napi_struct *n)
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{
	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();
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}

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enum netdev_queue_state_t {
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	__QUEUE_STATE_DRV_XOFF,
	__QUEUE_STATE_STACK_XOFF,
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	__QUEUE_STATE_FROZEN,
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};
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#define QUEUE_STATE_DRV_XOFF	(1 << __QUEUE_STATE_DRV_XOFF)
#define QUEUE_STATE_STACK_XOFF	(1 << __QUEUE_STATE_STACK_XOFF)
#define QUEUE_STATE_FROZEN	(1 << __QUEUE_STATE_FROZEN)

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

542 543 544 545 546 547 548 549 550
/*
 * __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_*.
 */
551

552
struct netdev_queue {
553
/*
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 * read-mostly part
555
 */
556
	struct net_device	*dev;
557
	struct Qdisc __rcu	*qdisc;
558
	struct Qdisc		*qdisc_sleeping;
559
#ifdef CONFIG_SYSFS
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	struct kobject		kobj;
#endif
562 563 564
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	int			numa_node;
#endif
565 566 567 568 569 570
	unsigned long		tx_maxrate;
	/*
	 * Number of TX timeouts for this queue
	 * (/sys/class/net/DEV/Q/trans_timeout)
	 */
	unsigned long		trans_timeout;
571
/*
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 * write-mostly part
573 574 575
 */
	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
	int			xmit_lock_owner;
576
	/*
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	 * Time (in jiffies) of last Tx
578 579
	 */
	unsigned long		trans_start;
580

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581 582 583 584 585
	unsigned long		state;

#ifdef CONFIG_BQL
	struct dql		dql;
#endif
586
} ____cacheline_aligned_in_smp;
587

588 589 590 591 592
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
593
	return NUMA_NO_NODE;
594 595 596 597 598 599 600 601 602 603
#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];
};
614
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
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/*
617 618 619
 * 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.
T
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 */
struct rps_dev_flow {
	u16 cpu;
623
	u16 filter;
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	unsigned int last_qtail;
};
626
#define RPS_NO_FILTER 0xffff
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627 628 629 630 631 632 633 634 635 636

/*
 * 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) + \
637
    ((_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.
644
 * 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,
647
 * meaning we use 32-6=26 bits for the hash.
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 */
struct rps_sock_flow_table {
650
	u32	mask;
651 652

	u32	ents[0] ____cacheline_aligned_in_smp;
T
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};
654
#define	RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num]))
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#define RPS_NO_CPU 0xffff

658 659 660
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) {
665 666
		unsigned int index = hash & table->mask;
		u32 val = hash & ~rps_cpu_mask;
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667

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668
		/* We only give a hint, preemption can change CPU under us */
669
		val |= raw_smp_processor_id();
T
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670

671 672
		if (table->ents[index] != val)
			table->ents[index] = val;
T
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673 674 675
	}
}

676
#ifdef CONFIG_RFS_ACCEL
677 678
bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
			 u16 filter_id);
679
#endif
680
#endif /* CONFIG_RPS */
681

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682 683
/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
684
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
685 686
	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
687
#endif
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688
	struct kobject			kobj;
T
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689
	struct net_device		*dev;
690
	struct xdp_rxq_info		xdp_rxq;
T
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691
} ____cacheline_aligned_in_smp;
692 693 694 695 696 697

/*
 * RX queue sysfs structures and functions.
 */
struct rx_queue_attribute {
	struct attribute attr;
698
	ssize_t (*show)(struct netdev_rx_queue *queue, char *buf);
699
	ssize_t (*store)(struct netdev_rx_queue *queue,
700
			 const char *buf, size_t len);
701
};
702

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703 704 705 706 707 708 709 710 711 712 713
#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];
};
714
#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
715 716
#define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \
       - sizeof(struct xps_map)) / sizeof(u16))
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717 718 719 720 721 722

/*
 * This structure holds all XPS maps for device.  Maps are indexed by CPU.
 */
struct xps_dev_maps {
	struct rcu_head rcu;
E
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723
	struct xps_map __rcu *cpu_map[0];
T
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724
};
725 726
#define XPS_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) +		\
	(nr_cpu_ids * (_tcs) * sizeof(struct xps_map *)))
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727 728
#endif /* CONFIG_XPS */

729 730 731 732 733 734 735 736
#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;
};

737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
#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

754
#define MAX_PHYS_ITEM_ID_LEN 32
755

756 757
/* This structure holds a unique identifier to identify some
 * physical item (port for example) used by a netdevice.
758
 */
759 760
struct netdev_phys_item_id {
	unsigned char id[MAX_PHYS_ITEM_ID_LEN];
761 762 763
	unsigned char id_len;
};

764 765 766 767 768 769 770
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;
}

771 772 773
typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
				       struct sk_buff *skb);

774
enum tc_setup_type {
775
	TC_SETUP_QDISC_MQPRIO,
776
	TC_SETUP_CLSU32,
777
	TC_SETUP_CLSFLOWER,
778
	TC_SETUP_CLSMATCHALL,
779
	TC_SETUP_CLSBPF,
780
	TC_SETUP_BLOCK,
781
	TC_SETUP_QDISC_CBS,
782
	TC_SETUP_QDISC_RED,
783
	TC_SETUP_QDISC_PRIO,
784 785
};

786 787
/* These structures hold the attributes of bpf state that are being passed
 * to the netdevice through the bpf op.
788
 */
789
enum bpf_netdev_command {
790 791 792 793 794 795 796 797
	/* 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,
798
	XDP_SETUP_PROG_HW,
799
	/* Check if a bpf program is set on the device.  The callee should
800 801
	 * set @prog_attached to one of XDP_ATTACHED_* values, note that "true"
	 * is equivalent to XDP_ATTACHED_DRV.
802 803
	 */
	XDP_QUERY_PROG,
804 805 806 807
	/* BPF program for offload callbacks, invoked at program load time. */
	BPF_OFFLOAD_VERIFIER_PREP,
	BPF_OFFLOAD_TRANSLATE,
	BPF_OFFLOAD_DESTROY,
808 809
	BPF_OFFLOAD_MAP_ALLOC,
	BPF_OFFLOAD_MAP_FREE,
810 811
};

812
struct bpf_prog_offload_ops;
813 814
struct netlink_ext_ack;

815 816
struct netdev_bpf {
	enum bpf_netdev_command command;
817 818
	union {
		/* XDP_SETUP_PROG */
819
		struct {
820
			u32 flags;
821 822 823
			struct bpf_prog *prog;
			struct netlink_ext_ack *extack;
		};
824
		/* XDP_QUERY_PROG */
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Martin KaFai Lau 已提交
825
		struct {
826
			u8 prog_attached;
M
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827
			u32 prog_id;
828 829
			/* flags with which program was installed */
			u32 prog_flags;
M
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830
		};
831 832 833
		/* BPF_OFFLOAD_VERIFIER_PREP */
		struct {
			struct bpf_prog *prog;
834
			const struct bpf_prog_offload_ops *ops; /* callee set */
835 836 837 838 839
		} verifier;
		/* BPF_OFFLOAD_TRANSLATE, BPF_OFFLOAD_DESTROY */
		struct {
			struct bpf_prog *prog;
		} offload;
840 841 842 843
		/* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */
		struct {
			struct bpf_offloaded_map *offmap;
		};
844 845
	};
};
846

847 848 849 850 851 852 853 854 855 856
#ifdef CONFIG_XFRM_OFFLOAD
struct xfrmdev_ops {
	int	(*xdo_dev_state_add) (struct xfrm_state *x);
	void	(*xdo_dev_state_delete) (struct xfrm_state *x);
	void	(*xdo_dev_state_free) (struct xfrm_state *x);
	bool	(*xdo_dev_offload_ok) (struct sk_buff *skb,
				       struct xfrm_state *x);
};
#endif

857 858 859 860 861
struct dev_ifalias {
	struct rcu_head rcuhead;
	char ifalias[];
};

862 863
/*
 * This structure defines the management hooks for network devices.
864 865
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
866 867
 *
 * int (*ndo_init)(struct net_device *dev);
B
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868 869 870 871
 *     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.
872 873 874 875 876 877
 *
 * 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);
B
Bjorn Helgaas 已提交
878
 *     This function is called when a network device transitions to the up
879 880 881
 *     state.
 *
 * int (*ndo_stop)(struct net_device *dev);
B
Bjorn Helgaas 已提交
882
 *     This function is called when a network device transitions to the down
883 884
 *     state.
 *
885 886
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
887
 *	Called when a packet needs to be transmitted.
888 889 890 891
 *	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.
B
Bjorn Helgaas 已提交
892
 *	Required; cannot be NULL.
893
 *
894 895 896 897 898 899 900 901 902
 * netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
 *					   struct net_device *dev
 *					   netdev_features_t features);
 *	Called by core transmit path to determine if device is capable of
 *	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.
903
 *
904
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
905
 *                         void *accel_priv, select_queue_fallback_t fallback);
B
Bjorn Helgaas 已提交
906
 *	Called to decide which queue to use when device supports multiple
907 908
 *	transmit queues.
 *
909 910
 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 *	This function is called to allow device receiver to make
B
Bjorn Helgaas 已提交
911
 *	changes to configuration when multicast or promiscuous is enabled.
912 913 914
 *
 * void (*ndo_set_rx_mode)(struct net_device *dev);
 *	This function is called device changes address list filtering.
915
 *	If driver handles unicast address filtering, it should set
B
Bjorn Helgaas 已提交
916
 *	IFF_UNICAST_FLT in its priv_flags.
917 918 919
 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *	This function  is called when the Media Access Control address
920
 *	needs to be changed. If this interface is not defined, the
B
Bjorn Helgaas 已提交
921
 *	MAC address can not be changed.
922 923 924 925 926
 *
 * 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);
B
Bjorn Helgaas 已提交
927 928
 *	Called when a user requests an ioctl which can't be handled by
 *	the generic interface code. If not defined ioctls return
929 930 931 932
 *	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
B
Bjorn Helgaas 已提交
933
 *	is retained for legacy reasons; new devices should use the bus
934 935 936 937
 *	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
938
 *	of a device.
939
 *
940
 * void (*ndo_tx_timeout)(struct net_device *dev);
B
Bjorn Helgaas 已提交
941
 *	Callback used when the transmitter has not made any progress
942 943
 *	for dev->watchdog ticks.
 *
944 945
 * void (*ndo_get_stats64)(struct net_device *dev,
 *                         struct rtnl_link_stats64 *storage);
946
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
947
 *	Called when a user wants to get the network device usage
948
 *	statistics. Drivers must do one of the following:
949 950
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
951
 *	2. Define @ndo_get_stats to update a net_device_stats structure
952 953 954 955 956
 *	   (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.
957
 *
958
 * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id)
959 960 961 962 963 964 965
 *	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.
 *
966
 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid);
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Bjorn Helgaas 已提交
967
 *	If device supports VLAN filtering this function is called when a
968
 *	VLAN id is registered.
969
 *
970
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid);
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Bjorn Helgaas 已提交
971
 *	If device supports VLAN filtering this function is called when a
972
 *	VLAN id is unregistered.
973 974
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
975 976 977
 *
 *	SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
978 979
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan,
 *			  u8 qos, __be16 proto);
980 981
 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
 *			  int max_tx_rate);
982
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
H
Hiroshi Shimamoto 已提交
983
 * int (*ndo_set_vf_trust)(struct net_device *dev, int vf, bool setting);
984 985
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
986
 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
987 988
 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 *			  struct nlattr *port[]);
989 990 991
 *
 *      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
B
Bjorn Helgaas 已提交
992
 *      with PF and querying it may introduce a theoretical security risk.
993
 * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting);
994
 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
995
 * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type,
996
 *		       void *type_data);
F
Florian Fainelli 已提交
997 998 999 1000
 *	Called to setup any 'tc' scheduler, classifier or action on @dev.
 *	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.
1001
 *
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
 *	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.
 *
1032 1033 1034 1035 1036 1037 1038
 * 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.
 *
1039 1040 1041 1042 1043 1044
 * 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.
 *
1045 1046 1047 1048 1049 1050
 *	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.
1051
 *
1052
 *	Slave management functions (for bridge, bonding, etc).
1053 1054 1055 1056 1057
 * 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.
1058 1059
 *
 *      Feature/offload setting functions.
1060 1061 1062 1063 1064 1065
 * 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.
 *
1066
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
1067 1068 1069 1070
 *	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.
 *
1071 1072
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
1073
 *		      const unsigned char *addr, u16 vid, u16 flags)
1074
 *	Adds an FDB entry to dev for addr.
1075 1076
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
1077
 *		      const unsigned char *addr, u16 vid)
1078 1079
 *	Deletes the FDB entry from dev coresponding to addr.
 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
1080
 *		       struct net_device *dev, struct net_device *filter_dev,
1081
 *		       int *idx)
1082 1083
 *	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
1084
 *
1085 1086
 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh,
 *			     u16 flags)
J
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1087
 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
1088 1089
 *			     struct net_device *dev, u32 filter_mask,
 *			     int nlflags)
1090 1091
 * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh,
 *			     u16 flags);
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Jiri Pirko 已提交
1092 1093 1094 1095 1096 1097 1098 1099
 *
 * 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.
1100 1101
 *
 * int (*ndo_get_phys_port_id)(struct net_device *dev,
1102
 *			       struct netdev_phys_item_id *ppid);
1103 1104 1105
 *	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.
1106
 *
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
 * 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.
 *
1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
 * 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.
1132 1133 1134 1135
 * 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.
1136 1137
 * int (*ndo_get_iflink)(const struct net_device *dev);
 *	Called to get the iflink value of this device.
1138
 * void (*ndo_change_proto_down)(struct net_device *dev,
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Bjorn Helgaas 已提交
1139
 *				 bool proto_down);
1140 1141 1142
 *	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.
1143 1144 1145 1146
 * 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.
1147 1148 1149 1150
 * 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
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Bjorn Helgaas 已提交
1151
 *	forward. Setting a negative value resets the rx headroom to the
1152
 *	default value.
1153
 * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf);
1154
 *	This function is used to set or query state related to XDP on the
1155 1156
 *	netdevice and manage BPF offload. See definition of
 *	enum bpf_netdev_command for details.
1157 1158 1159
 * int (*ndo_xdp_xmit)(struct net_device *dev, struct xdp_buff *xdp);
 *	This function is used to submit a XDP packet for transmit on a
 *	netdevice.
1160
 * void (*ndo_xdp_flush)(struct net_device *dev);
1161 1162
 *	This function is used to inform the driver to flush a particular
 *	xdp tx queue. Must be called on same CPU as xdp_xmit.
1163 1164 1165 1166 1167 1168
 */
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);
1169 1170 1171 1172 1173
	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);
1174
	u16			(*ndo_select_queue)(struct net_device *dev,
1175
						    struct sk_buff *skb,
1176 1177
						    void *accel_priv,
						    select_queue_fallback_t fallback);
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
	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);
1188 1189 1190 1191
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
1192 1193
	void			(*ndo_tx_timeout) (struct net_device *dev);

1194 1195
	void			(*ndo_get_stats64)(struct net_device *dev,
						   struct rtnl_link_stats64 *storage);
1196
	bool			(*ndo_has_offload_stats)(const struct net_device *dev, int attr_id);
1197 1198 1199
	int			(*ndo_get_offload_stats)(int attr_id,
							 const struct net_device *dev,
							 void *attr_data);
1200 1201
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

1202
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
1203
						       __be16 proto, u16 vid);
1204
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1205
						        __be16 proto, u16 vid);
1206 1207
#ifdef CONFIG_NET_POLL_CONTROLLER
	void                    (*ndo_poll_controller)(struct net_device *dev);
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Herbert Xu 已提交
1208
	int			(*ndo_netpoll_setup)(struct net_device *dev,
1209
						     struct netpoll_info *info);
1210
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
1211
#endif
1212 1213 1214
	int			(*ndo_set_vf_mac)(struct net_device *dev,
						  int queue, u8 *mac);
	int			(*ndo_set_vf_vlan)(struct net_device *dev,
1215 1216
						   int queue, u16 vlan,
						   u8 qos, __be16 proto);
1217 1218 1219
	int			(*ndo_set_vf_rate)(struct net_device *dev,
						   int vf, int min_tx_rate,
						   int max_tx_rate);
1220 1221
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
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Hiroshi Shimamoto 已提交
1222 1223
	int			(*ndo_set_vf_trust)(struct net_device *dev,
						    int vf, bool setting);
1224 1225 1226
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
1227 1228
	int			(*ndo_set_vf_link_state)(struct net_device *dev,
							 int vf, int link_state);
1229 1230 1231 1232
	int			(*ndo_get_vf_stats)(struct net_device *dev,
						    int vf,
						    struct ifla_vf_stats
						    *vf_stats);
1233 1234 1235 1236 1237
	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);
1238 1239 1240
	int			(*ndo_set_vf_guid)(struct net_device *dev,
						   int vf, u64 guid,
						   int guid_type);
1241 1242 1243
	int			(*ndo_set_vf_rss_query_en)(
						   struct net_device *dev,
						   int vf, bool setting);
1244
	int			(*ndo_setup_tc)(struct net_device *dev,
1245
						enum tc_setup_type type,
1246
						void *type_data);
1247
#if IS_ENABLED(CONFIG_FCOE)
1248 1249
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
1250 1251 1252 1253 1254 1255
	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);
1256 1257 1258 1259
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
1260 1261
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
1262 1263
#endif

1264
#if IS_ENABLED(CONFIG_LIBFCOE)
1265 1266 1267 1268
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
1269
#endif
1270

1271 1272 1273 1274 1275 1276
#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
1277
	int			(*ndo_add_slave)(struct net_device *dev,
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David Ahern 已提交
1278 1279
						 struct net_device *slave_dev,
						 struct netlink_ext_ack *extack);
1280 1281
	int			(*ndo_del_slave)(struct net_device *dev,
						 struct net_device *slave_dev);
1282 1283
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
1284
	int			(*ndo_set_features)(struct net_device *dev,
1285
						    netdev_features_t features);
1286 1287 1288 1289
	int			(*ndo_neigh_construct)(struct net_device *dev,
						       struct neighbour *n);
	void			(*ndo_neigh_destroy)(struct net_device *dev,
						     struct neighbour *n);
1290 1291

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1292
					       struct nlattr *tb[],
1293
					       struct net_device *dev,
1294
					       const unsigned char *addr,
1295
					       u16 vid,
1296 1297
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1298
					       struct nlattr *tb[],
1299
					       struct net_device *dev,
1300 1301
					       const unsigned char *addr,
					       u16 vid);
1302 1303 1304
	int			(*ndo_fdb_dump)(struct sk_buff *skb,
						struct netlink_callback *cb,
						struct net_device *dev,
1305
						struct net_device *filter_dev,
1306
						int *idx);
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John Fastabend 已提交
1307 1308

	int			(*ndo_bridge_setlink)(struct net_device *dev,
1309 1310
						      struct nlmsghdr *nlh,
						      u16 flags);
J
John Fastabend 已提交
1311 1312
	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
						      u32 pid, u32 seq,
1313
						      struct net_device *dev,
1314 1315
						      u32 filter_mask,
						      int nlflags);
1316
	int			(*ndo_bridge_dellink)(struct net_device *dev,
1317 1318
						      struct nlmsghdr *nlh,
						      u16 flags);
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Jiri Pirko 已提交
1319 1320
	int			(*ndo_change_carrier)(struct net_device *dev,
						      bool new_carrier);
1321
	int			(*ndo_get_phys_port_id)(struct net_device *dev,
1322
							struct netdev_phys_item_id *ppid);
1323 1324
	int			(*ndo_get_phys_port_name)(struct net_device *dev,
							  char *name, size_t len);
1325 1326 1327 1328
	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);
1329 1330 1331 1332 1333
	void*			(*ndo_dfwd_add_station)(struct net_device *pdev,
							struct net_device *dev);
	void			(*ndo_dfwd_del_station)(struct net_device *pdev,
							void *priv);

1334
	int			(*ndo_get_lock_subclass)(struct net_device *dev);
1335 1336 1337
	int			(*ndo_set_tx_maxrate)(struct net_device *dev,
						      int queue_index,
						      u32 maxrate);
1338
	int			(*ndo_get_iflink)(const struct net_device *dev);
1339 1340
	int			(*ndo_change_proto_down)(struct net_device *dev,
							 bool proto_down);
1341 1342
	int			(*ndo_fill_metadata_dst)(struct net_device *dev,
						       struct sk_buff *skb);
1343 1344
	void			(*ndo_set_rx_headroom)(struct net_device *dev,
						       int needed_headroom);
1345 1346
	int			(*ndo_bpf)(struct net_device *dev,
					   struct netdev_bpf *bpf);
1347 1348
	int			(*ndo_xdp_xmit)(struct net_device *dev,
						struct xdp_buff *xdp);
1349
	void			(*ndo_xdp_flush)(struct net_device *dev);
1350 1351
};

1352 1353 1354 1355 1356
/**
 * 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
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Bjorn Helgaas 已提交
1357
 * userspace; this means that the order of these flags can change
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
 * 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
1381 1382 1383 1384
 * @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
1385
 * @IFF_L3MDEV_MASTER: device is an L3 master device
1386
 * @IFF_NO_QUEUE: device can run without qdisc attached
1387
 * @IFF_OPENVSWITCH: device is a Open vSwitch master
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1388
 * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
J
Jiri Pirko 已提交
1389
 * @IFF_TEAM: device is a team device
1390
 * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
1391 1392
 * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
 *	entity (i.e. the master device for bridged veth)
1393
 * @IFF_MACSEC: device is a MACsec device
1394 1395 1396 1397
 */
enum netdev_priv_flags {
	IFF_802_1Q_VLAN			= 1<<0,
	IFF_EBRIDGE			= 1<<1,
1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
	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,
1416
	IFF_L3MDEV_MASTER		= 1<<20,
1417 1418
	IFF_NO_QUEUE			= 1<<21,
	IFF_OPENVSWITCH			= 1<<22,
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David Ahern 已提交
1419
	IFF_L3MDEV_SLAVE		= 1<<23,
J
Jiri Pirko 已提交
1420
	IFF_TEAM			= 1<<24,
1421
	IFF_RXFH_CONFIGURED		= 1<<25,
1422
	IFF_PHONY_HEADROOM		= 1<<26,
1423
	IFF_MACSEC			= 1<<27,
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
};

#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
1443
#define IFF_XMIT_DST_RELEASE_PERM	IFF_XMIT_DST_RELEASE_PERM
1444 1445
#define IFF_IPVLAN_MASTER		IFF_IPVLAN_MASTER
#define IFF_IPVLAN_SLAVE		IFF_IPVLAN_SLAVE
1446
#define IFF_L3MDEV_MASTER		IFF_L3MDEV_MASTER
1447
#define IFF_NO_QUEUE			IFF_NO_QUEUE
1448
#define IFF_OPENVSWITCH			IFF_OPENVSWITCH
1449
#define IFF_L3MDEV_SLAVE		IFF_L3MDEV_SLAVE
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#define IFF_TEAM			IFF_TEAM
1451
#define IFF_RXFH_CONFIGURED		IFF_RXFH_CONFIGURED
1452
#define IFF_MACSEC			IFF_MACSEC
1453

1454 1455
/**
 *	struct net_device - The DEVICE structure.
1456 1457 1458 1459
 *
 *	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.
1460 1461 1462
 *
 *	@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
1463
 *		of the interface.
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
 *
 *	@name_hlist: 	Device name hash chain, please keep it close to name[]
 *	@ifalias:	SNMP alias
 *	@mem_end:	Shared memory end
 *	@mem_start:	Shared memory start
 *	@base_addr:	Device I/O address
 *	@irq:		Device IRQ number
 *
 *	@state:		Generic network queuing layer state, see netdev_state_t
 *	@dev_list:	The global list of network devices
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 *	@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
1478 1479
 *	@ptype_all:     Device-specific packet handlers for all protocols
 *	@ptype_specific: Device-specific, protocol-specific packet handlers
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
 *
 *	@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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 *	@group:		The group the device belongs to
1497 1498 1499 1500 1501 1502 1503 1504
 *
 *	@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
1505 1506
 *	@rx_nohandler:	nohandler dropped packets by core network on
 *			inactive devices, do not use this in drivers
1507 1508
 *	@carrier_up_count:	Number of times the carrier has been up
 *	@carrier_down_count:	Number of times the carrier has been down
1509 1510 1511 1512 1513 1514 1515 1516 1517
 *
 *	@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
1518 1519
 *	@ndisc_ops:	Includes callbacks for different IPv6 neighbour
 *			discovery handling. Necessary for e.g. 6LoWPAN.
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 *	@header_ops:	Includes callbacks for creating,parsing,caching,etc
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
 *			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
1533 1534
 *	@min_mtu:	Interface Minimum MTU value
 *	@max_mtu:	Interface Maximum MTU value
1535
 *	@type:		Interface hardware type
1536
 *	@hard_header_len: Maximum hardware header length.
1537
 *	@min_header_len:  Minimum hardware header length
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549
 *
 *	@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
1550
 *	@neigh_priv_len:	Used in neigh_alloc()
1551 1552 1553 1554 1555
 * 	@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
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 *	@uc_promisc:		Counter that indicates promiscuous mode
1557 1558 1559
 *				has been enabled due to the need to listen to
 *				additional unicast addresses in a device that
 *				does not implement ndo_set_rx_mode()
1560 1561 1562 1563
 *	@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
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 *	@promiscuity:		Number of times the NIC is told to work in
 *				promiscuous mode; if it becomes 0 the NIC will
 *				exit promiscuous mode
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588
 *	@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
 *
 *	@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
1589 1590
 *	@miniq_ingress:		ingress/clsact qdisc specific data for
 *				ingress processing
1591 1592 1593
 *	@ingress_queue:		XXX: need comments on this one
 *	@broadcast:		hw bcast address
 *
1594 1595 1596 1597 1598 1599
 *	@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
 *
1600 1601 1602 1603 1604 1605 1606 1607
 *	@_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
1608 1609
 *	@miniq_egress:		clsact qdisc specific data for
 *				egress processing
1610
 *	@watchdog_timeo:	Represents the timeout that is used by
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Bjorn Helgaas 已提交
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 *				the watchdog (see dev_watchdog())
1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622
 *	@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
 *
1623 1624
 *	@needs_free_netdev:	Should unregister perform free_netdev?
 *	@priv_destructor:	Called from unregister
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650
 *	@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
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Randy Dunlap 已提交
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 *	@prio_tc_map:	XXX: need comments on this one
1652 1653 1654 1655 1656 1657 1658
 *
 *	@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
 *
1659 1660
 *	@qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
 *	@qdisc_running_key: lockdep class annotating Qdisc->running seqcount
1661
 *
1662 1663 1664 1665
 *	@proto_down:	protocol port state information can be sent to the
 *			switch driver and used to set the phys state of the
 *			switch port.
 *
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Linus Torvalds 已提交
1666 1667 1668 1669
 *	FIXME: cleanup struct net_device such that network protocol info
 *	moves out.
 */

E
Eric Dumazet 已提交
1670
struct net_device {
L
Linus Torvalds 已提交
1671
	char			name[IFNAMSIZ];
1672
	struct hlist_node	name_hlist;
1673
	struct dev_ifalias	__rcu *ifalias;
L
Linus Torvalds 已提交
1674 1675 1676 1677
	/*
	 *	I/O specific fields
	 *	FIXME: Merge these and struct ifmap into one
	 */
1678 1679 1680 1681
	unsigned long		mem_end;
	unsigned long		mem_start;
	unsigned long		base_addr;
	int			irq;
L
Linus Torvalds 已提交
1682 1683

	/*
1684 1685
	 *	Some hardware also needs these fields (state,dev_list,
	 *	napi_list,unreg_list,close_list) but they are not
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Linus Torvalds 已提交
1686 1687 1688 1689 1690
	 *	part of the usual set specified in Space.c.
	 */

	unsigned long		state;

1691
	struct list_head	dev_list;
1692
	struct list_head	napi_list;
1693
	struct list_head	unreg_list;
1694
	struct list_head	close_list;
1695 1696
	struct list_head	ptype_all;
	struct list_head	ptype_specific;
1697 1698 1699 1700 1701 1702

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

1703 1704 1705 1706
	netdev_features_t	features;
	netdev_features_t	hw_features;
	netdev_features_t	wanted_features;
	netdev_features_t	vlan_features;
1707
	netdev_features_t	hw_enc_features;
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Simon Horman 已提交
1708
	netdev_features_t	mpls_features;
1709
	netdev_features_t	gso_partial_features;
1710

L
Linus Torvalds 已提交
1711
	int			ifindex;
1712
	int			group;
L
Linus Torvalds 已提交
1713

R
Rusty Russell 已提交
1714
	struct net_device_stats	stats;
1715 1716 1717

	atomic_long_t		rx_dropped;
	atomic_long_t		tx_dropped;
1718
	atomic_long_t		rx_nohandler;
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Linus Torvalds 已提交
1719

1720 1721 1722 1723
	/* Stats to monitor link on/off, flapping */
	atomic_t		carrier_up_count;
	atomic_t		carrier_down_count;

1724
#ifdef CONFIG_WIRELESS_EXT
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Bjorn Helgaas 已提交
1725 1726
	const struct iw_handler_def *wireless_handlers;
	struct iw_public_data	*wireless_data;
1727
#endif
1728
	const struct net_device_ops *netdev_ops;
1729
	const struct ethtool_ops *ethtool_ops;
S
Scott Feldman 已提交
1730
#ifdef CONFIG_NET_SWITCHDEV
J
Jiri Pirko 已提交
1731
	const struct switchdev_ops *switchdev_ops;
S
Scott Feldman 已提交
1732
#endif
1733 1734 1735
#ifdef CONFIG_NET_L3_MASTER_DEV
	const struct l3mdev_ops	*l3mdev_ops;
#endif
1736 1737 1738
#if IS_ENABLED(CONFIG_IPV6)
	const struct ndisc_ops *ndisc_ops;
#endif
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Linus Torvalds 已提交
1739

1740
#ifdef CONFIG_XFRM_OFFLOAD
1741 1742 1743
	const struct xfrmdev_ops *xfrmdev_ops;
#endif

1744 1745
	const struct header_ops *header_ops;

1746 1747 1748
	unsigned int		flags;
	unsigned int		priv_flags;

L
Linus Torvalds 已提交
1749
	unsigned short		gflags;
1750
	unsigned short		padded;
L
Linus Torvalds 已提交
1751

1752 1753
	unsigned char		operstate;
	unsigned char		link_mode;
S
Stefan Rompf 已提交
1754

1755 1756
	unsigned char		if_port;
	unsigned char		dma;
1757

1758
	unsigned int		mtu;
1759 1760
	unsigned int		min_mtu;
	unsigned int		max_mtu;
1761 1762
	unsigned short		type;
	unsigned short		hard_header_len;
1763
	unsigned char		min_header_len;
L
Linus Torvalds 已提交
1764

1765 1766 1767
	unsigned short		needed_headroom;
	unsigned short		needed_tailroom;

L
Linus Torvalds 已提交
1768
	/* Interface address info. */
1769 1770 1771
	unsigned char		perm_addr[MAX_ADDR_LEN];
	unsigned char		addr_assign_type;
	unsigned char		addr_len;
1772
	unsigned short		neigh_priv_len;
1773 1774
	unsigned short          dev_id;
	unsigned short          dev_port;
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Jiri Pirko 已提交
1775
	spinlock_t		addr_list_lock;
1776 1777
	unsigned char		name_assign_type;
	bool			uc_promisc;
1778 1779 1780 1781
	struct netdev_hw_addr_list	uc;
	struct netdev_hw_addr_list	mc;
	struct netdev_hw_addr_list	dev_addrs;

1782 1783 1784
#ifdef CONFIG_SYSFS
	struct kset		*queues_kset;
#endif
1785 1786
	unsigned int		promiscuity;
	unsigned int		allmulti;
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Linus Torvalds 已提交
1787 1788


B
Bjorn Helgaas 已提交
1789
	/* Protocol-specific pointers */
1790

1791
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1792
	struct vlan_info __rcu	*vlan_info;
1793
#endif
1794
#if IS_ENABLED(CONFIG_NET_DSA)
1795
	struct dsa_port		*dsa_ptr;
1796 1797
#endif
#if IS_ENABLED(CONFIG_TIPC)
1798
	struct tipc_bearer __rcu *tipc_ptr;
1799
#endif
1800 1801 1802 1803 1804 1805
	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;
1806
	struct wpan_dev		*ieee802154_ptr;
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Robert Shearman 已提交
1807 1808 1809
#if IS_ENABLED(CONFIG_MPLS_ROUTING)
	struct mpls_dev __rcu	*mpls_ptr;
#endif
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Linus Torvalds 已提交
1810

1811
/*
E
Eric Dumazet 已提交
1812
 * Cache lines mostly used on receive path (including eth_type_trans())
1813 1814
 */
	/* Interface address info used in eth_type_trans() */
1815
	unsigned char		*dev_addr;
1816

T
Tom Herbert 已提交
1817 1818
	struct netdev_rx_queue	*_rx;
	unsigned int		num_rx_queues;
1819
	unsigned int		real_num_rx_queues;
T
Tom Herbert 已提交
1820

1821
	struct bpf_prog __rcu	*xdp_prog;
1822
	unsigned long		gro_flush_timeout;
1823 1824
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1825

1826
#ifdef CONFIG_NET_CLS_ACT
1827
	struct mini_Qdisc __rcu	*miniq_ingress;
1828
#endif
1829
	struct netdev_queue __rcu *ingress_queue;
1830
#ifdef CONFIG_NETFILTER_INGRESS
1831
	struct nf_hook_entries __rcu *nf_hooks_ingress;
1832
#endif
1833

1834
	unsigned char		broadcast[MAX_ADDR_LEN];
1835 1836 1837 1838
#ifdef CONFIG_RFS_ACCEL
	struct cpu_rmap		*rx_cpu_rmap;
#endif
	struct hlist_node	index_hlist;
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Eric Dumazet 已提交
1839 1840 1841 1842

/*
 * Cache lines mostly used on transmit path
 */
1843 1844
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
	unsigned int		num_tx_queues;
1845
	unsigned int		real_num_tx_queues;
1846
	struct Qdisc		*qdisc;
1847 1848 1849
#ifdef CONFIG_NET_SCHED
	DECLARE_HASHTABLE	(qdisc_hash, 4);
#endif
1850
	unsigned int		tx_queue_len;
1851
	spinlock_t		tx_global_lock;
1852
	int			watchdog_timeo;
E
Eric Dumazet 已提交
1853

T
Tom Herbert 已提交
1854
#ifdef CONFIG_XPS
E
Eric Dumazet 已提交
1855
	struct xps_dev_maps __rcu *xps_maps;
T
Tom Herbert 已提交
1856
#endif
D
Daniel Borkmann 已提交
1857
#ifdef CONFIG_NET_CLS_ACT
1858
	struct mini_Qdisc __rcu	*miniq_egress;
D
Daniel Borkmann 已提交
1859
#endif
1860

1861 1862 1863
	/* These may be needed for future network-power-down code. */
	struct timer_list	watchdog_timer;

E
Eric Dumazet 已提交
1864
	int __percpu		*pcpu_refcnt;
L
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1865 1866
	struct list_head	todo_list;

1867
	struct list_head	link_watch_list;
1868

L
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1869
	enum { NETREG_UNINITIALIZED=0,
1870
	       NETREG_REGISTERED,	/* completed register_netdevice */
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1871 1872 1873
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1874
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1875 1876
	} reg_state:8;

1877
	bool dismantle;
1878 1879 1880 1881 1882

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
L
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1883

1884 1885
	bool needs_free_netdev;
	void (*priv_destructor)(struct net_device *dev);
L
Linus Torvalds 已提交
1886 1887

#ifdef CONFIG_NETPOLL
1888
	struct netpoll_info __rcu	*npinfo;
L
Linus Torvalds 已提交
1889
#endif
1890

1891
	possible_net_t			nd_net;
1892

D
David S. Miller 已提交
1893
	/* mid-layer private */
E
Eric Dumazet 已提交
1894
	union {
1895 1896
		void					*ml_priv;
		struct pcpu_lstats __percpu		*lstats;
1897
		struct pcpu_sw_netstats __percpu	*tstats;
1898 1899
		struct pcpu_dstats __percpu		*dstats;
		struct pcpu_vstats __percpu		*vstats;
E
Eric Dumazet 已提交
1900
	};
1901

1902
#if IS_ENABLED(CONFIG_GARP)
E
Eric Dumazet 已提交
1903
	struct garp_port __rcu	*garp_port;
1904 1905
#endif
#if IS_ENABLED(CONFIG_MRP)
1906
	struct mrp_port __rcu	*mrp_port;
1907
#endif
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1908

B
Bjorn Helgaas 已提交
1909
	struct device		dev;
1910
	const struct attribute_group *sysfs_groups[4];
1911
	const struct attribute_group *sysfs_rx_queue_group;
P
Patrick McHardy 已提交
1912 1913

	const struct rtnl_link_ops *rtnl_link_ops;
1914

1915 1916 1917
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1918 1919
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1920

J
Jeff Kirsher 已提交
1921
#ifdef CONFIG_DCB
1922
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1923
#endif
B
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1924 1925 1926
	u8			num_tc;
	struct netdev_tc_txq	tc_to_txq[TC_MAX_QUEUE];
	u8			prio_tc_map[TC_BITMASK + 1];
1927

1928
#if IS_ENABLED(CONFIG_FCOE)
1929
	unsigned int		fcoe_ddp_xid;
1930
#endif
1931
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1932
	struct netprio_map __rcu *priomap;
1933
#endif
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1934 1935
	struct phy_device	*phydev;
	struct lock_class_key	*qdisc_tx_busylock;
1936
	struct lock_class_key	*qdisc_running_key;
B
Bjorn Helgaas 已提交
1937
	bool			proto_down;
L
Linus Torvalds 已提交
1938
};
1939
#define to_net_dev(d) container_of(d, struct net_device, dev)
L
Linus Torvalds 已提交
1940

D
David S. Miller 已提交
1941 1942 1943 1944 1945 1946 1947
static inline bool netif_elide_gro(const struct net_device *dev)
{
	if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog)
		return true;
	return false;
}

L
Linus Torvalds 已提交
1948 1949
#define	NETDEV_ALIGN		32

1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
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;
}

1966
int netdev_txq_to_tc(struct net_device *dev, unsigned int txq);
1967 1968 1969
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);
1970 1971 1972 1973 1974 1975 1976

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

1977 1978 1979 1980 1981 1982 1983
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
					 unsigned int index)
{
	return &dev->_tx[index];
}

1984 1985 1986 1987 1988 1989
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));
}

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
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);
}

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
#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);	\
}

2019
struct netdev_queue *netdev_pick_tx(struct net_device *dev,
2020 2021
				    struct sk_buff *skb,
				    void *accel_priv);
2022

2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042
/* 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);
}

2043 2044 2045 2046 2047 2048
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
Eric Dumazet 已提交
2049
	return read_pnet(&dev->nd_net);
2050 2051 2052
}

static inline
2053
void dev_net_set(struct net_device *dev, struct net *net)
2054
{
2055
	write_pnet(&dev->nd_net, net);
2056 2057
}

2058 2059 2060 2061 2062 2063
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
2064
static inline void *netdev_priv(const struct net_device *dev)
L
Linus Torvalds 已提交
2065
{
2066
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
L
Linus Torvalds 已提交
2067 2068 2069 2070 2071
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
2072
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
L
Linus Torvalds 已提交
2073

2074
/* Set the sysfs device type for the network logical device to allow
2075
 * fine-grained identification of different network device types. For
B
Bjorn Helgaas 已提交
2076
 * example Ethernet, Wireless LAN, Bluetooth, WiMAX etc.
2077 2078 2079
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

E
Eric Dumazet 已提交
2080 2081 2082 2083 2084
/* Default NAPI poll() weight
 * Device drivers are strongly advised to not use bigger value
 */
#define NAPI_POLL_WEIGHT 64

2085
/**
B
Bjorn Helgaas 已提交
2086
 *	netif_napi_add - initialize a NAPI context
2087
 *	@dev:  network device
B
Bjorn Helgaas 已提交
2088
 *	@napi: NAPI context
2089 2090 2091
 *	@poll: polling function
 *	@weight: default weight
 *
B
Bjorn Helgaas 已提交
2092 2093
 * netif_napi_add() must be used to initialize a NAPI context prior to calling
 * *any* of the other NAPI-related functions.
2094
 */
2095 2096
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
2097

E
Eric Dumazet 已提交
2098
/**
B
Bjorn Helgaas 已提交
2099
 *	netif_tx_napi_add - initialize a NAPI context
E
Eric Dumazet 已提交
2100
 *	@dev:  network device
B
Bjorn Helgaas 已提交
2101
 *	@napi: NAPI context
E
Eric Dumazet 已提交
2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
 *	@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);
}

2118
/**
B
Bjorn Helgaas 已提交
2119 2120
 *  netif_napi_del - remove a NAPI context
 *  @napi: NAPI context
2121
 *
B
Bjorn Helgaas 已提交
2122
 *  netif_napi_del() removes a NAPI context from the network device NAPI list
2123
 */
2124 2125 2126
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
2127
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
B
Bjorn Helgaas 已提交
2128
	void	*frag0;
2129

2130 2131 2132
	/* Length of frag0. */
	unsigned int frag0_len;

2133
	/* This indicates where we are processing relative to skb->data. */
B
Bjorn Helgaas 已提交
2134
	int	data_offset;
2135

2136
	/* This is non-zero if the packet cannot be merged with the new skb. */
2137 2138 2139 2140
	u16	flush;

	/* Save the IP ID here and check when we get to the transport layer */
	u16	flush_id;
2141 2142

	/* Number of segments aggregated. */
2143 2144
	u16	count;

2145 2146 2147
	/* Start offset for remote checksum offload */
	u16	gro_remcsum_start;

2148 2149
	/* jiffies when first packet was created/queued */
	unsigned long age;
2150

T
Tom Herbert 已提交
2151
	/* Used in ipv6_gro_receive() and foo-over-udp */
2152 2153
	u16	proto;

2154 2155 2156
	/* This is non-zero if the packet may be of the same flow. */
	u8	same_flow:1;

2157 2158
	/* Used in tunnel GRO receive */
	u8	encap_mark:1;
T
Tom Herbert 已提交
2159 2160 2161 2162

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

2163 2164
	/* Number of checksums via CHECKSUM_UNNECESSARY */
	u8	csum_cnt:3;
2165

2166 2167 2168 2169 2170
	/* Free the skb? */
	u8	free:2;
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2

2171 2172 2173
	/* Used in foo-over-udp, set in udp[46]_gro_receive */
	u8	is_ipv6:1;

2174 2175 2176
	/* Used in GRE, set in fou/gue_gro_receive */
	u8	is_fou:1;

2177 2178 2179
	/* Used to determine if flush_id can be ignored */
	u8	is_atomic:1;

S
Sabrina Dubroca 已提交
2180 2181 2182 2183
	/* Number of gro_receive callbacks this packet already went through */
	u8 recursion_counter:4;

	/* 1 bit hole */
2184

2185 2186 2187
	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
	__wsum	csum;

2188 2189
	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
2190 2191 2192
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
2193

S
Sabrina Dubroca 已提交
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227
#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
2228
struct packet_type {
D
David S. Miller 已提交
2229 2230 2231 2232 2233 2234
	__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 *);
2235 2236
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
L
Linus Torvalds 已提交
2237 2238 2239 2240
	void			*af_packet_priv;
	struct list_head	list;
};

2241
struct offload_callbacks {
2242
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
2243
						netdev_features_t features);
2244
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
2245
						 struct sk_buff *skb);
2246
	int			(*gro_complete)(struct sk_buff *skb, int nhoff);
2247 2248 2249 2250
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
2251
	u16			 priority;
2252 2253
	struct offload_callbacks callbacks;
	struct list_head	 list;
L
Linus Torvalds 已提交
2254 2255
};

B
Bjorn Helgaas 已提交
2256
/* often modified stats are per-CPU, other are shared (netdev->stats) */
2257 2258 2259 2260 2261 2262 2263 2264
struct pcpu_sw_netstats {
	u64     rx_packets;
	u64     rx_bytes;
	u64     tx_packets;
	u64     tx_bytes;
	struct u64_stats_sync   syncp;
};

2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276
#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;							\
2277 2278
})

2279
#define netdev_alloc_pcpu_stats(type)					\
2280
	__netdev_alloc_pcpu_stats(type, GFP_KERNEL)
2281

2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294
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;
};

2295 2296 2297 2298 2299
struct netdev_lag_lower_state_info {
	u8 link_up : 1,
	   tx_enabled : 1;
};

L
Linus Torvalds 已提交
2300 2301
#include <linux/notifier.h>

2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
/* 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
2315
#define NETDEV_CHANGEMTU	0x0007 /* notify after mtu change happened */
2316 2317 2318 2319 2320 2321 2322 2323 2324
#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
2325
#define NETDEV_UNREGISTER_FINAL 0x0011
2326 2327 2328
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014
2329
#define NETDEV_CHANGEUPPER	0x0015
2330
#define NETDEV_RESEND_IGMP	0x0016
2331
#define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
2332
#define NETDEV_CHANGEINFODATA	0x0018
2333
#define NETDEV_BONDING_INFO	0x0019
2334
#define NETDEV_PRECHANGEUPPER	0x001A
2335
#define NETDEV_CHANGELOWERSTATE	0x001B
2336
#define NETDEV_UDP_TUNNEL_PUSH_INFO	0x001C
2337
#define NETDEV_UDP_TUNNEL_DROP_INFO	0x001D
2338
#define NETDEV_CHANGE_TX_QUEUE_LEN	0x001E
2339

2340 2341
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);
2342 2343

struct netdev_notifier_info {
2344 2345
	struct net_device	*dev;
	struct netlink_ext_ack	*extack;
2346 2347
};

2348 2349 2350 2351 2352
struct netdev_notifier_change_info {
	struct netdev_notifier_info info; /* must be first */
	unsigned int flags_changed;
};

2353 2354 2355 2356
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
2357
	bool linking; /* is the notification for link or unlink */
2358
	void *upper_info; /* upper dev info */
2359 2360
};

2361 2362 2363 2364 2365
struct netdev_notifier_changelowerstate_info {
	struct netdev_notifier_info info; /* must be first */
	void *lower_state_info; /* is lower dev state */
};

2366 2367 2368 2369
static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
					     struct net_device *dev)
{
	info->dev = dev;
2370
	info->extack = NULL;
2371 2372
}

2373 2374 2375 2376 2377 2378
static inline struct net_device *
netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
{
	return info->dev;
}

2379 2380 2381 2382 2383 2384
static inline struct netlink_ext_ack *
netdev_notifier_info_to_extack(const struct netdev_notifier_info *info)
{
	return info->extack;
}

2385
int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
2386 2387


L
Linus Torvalds 已提交
2388 2389
extern rwlock_t				dev_base_lock;		/* Device list lock */

2390 2391
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
2392 2393
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
2394 2395
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
2396 2397 2398 2399
#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)
2400 2401
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
2402 2403
#define for_each_netdev_in_bond_rcu(bond, slave)	\
		for_each_netdev_rcu(&init_net, slave)	\
2404
			if (netdev_master_upper_dev_get_rcu(slave) == (bond))
2405
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
2406

2407 2408 2409 2410 2411
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

2412
	net = dev_net(dev);
2413 2414 2415 2416
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2417 2418 2419 2420 2421 2422
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
2423
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
2424 2425 2426
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2427 2428 2429 2430 2431
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);
}
2432

E
Eric Dumazet 已提交
2433 2434 2435 2436 2437 2438 2439
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);
}

2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451
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);

2452
int dev_get_iflink(const struct net_device *dev);
2453
int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
2454 2455
struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
				      unsigned short mask);
2456 2457 2458 2459 2460
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);
2461 2462
void dev_close(struct net_device *dev);
void dev_close_many(struct list_head *head, bool unlink);
2463
void dev_disable_lro(struct net_device *dev);
2464
int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb);
2465
int dev_queue_xmit(struct sk_buff *skb);
2466
int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
2467 2468 2469
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);
2470 2471 2472 2473 2474
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

2475 2476
int netdev_refcnt_read(const struct net_device *dev);
void free_netdev(struct net_device *dev);
2477
void netdev_freemem(struct net_device *dev);
2478 2479
void synchronize_net(void);
int init_dummy_netdev(struct net_device *dev);
2480

2481
DECLARE_PER_CPU(int, xmit_recursion);
2482 2483
#define XMIT_RECURSION_LIMIT	10

2484 2485 2486 2487 2488
static inline int dev_recursion_level(void)
{
	return this_cpu_read(xmit_recursion);
}

2489 2490 2491
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);
2492
struct net_device *dev_get_by_napi_id(unsigned int napi_id);
2493 2494 2495
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);
2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511

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;
}

2512 2513
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
2514
{
2515 2516
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
2517

2518 2519 2520 2521
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
2522

2523 2524 2525 2526 2527 2528
static inline void skb_gro_frag0_invalidate(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
}

2529 2530 2531
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
2532 2533 2534
	if (!pskb_may_pull(skb, hlen))
		return NULL;

2535
	skb_gro_frag0_invalidate(skb);
2536
	return skb->data + offset;
2537
}
L
Linus Torvalds 已提交
2538

H
Herbert Xu 已提交
2539 2540
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
2541 2542
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
2543 2544
}

2545 2546 2547
static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
					const void *start, unsigned int len)
{
T
Tom Herbert 已提交
2548
	if (NAPI_GRO_CB(skb)->csum_valid)
2549 2550 2551 2552
		NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
						  csum_partial(start, len, 0));
}

T
Tom Herbert 已提交
2553 2554 2555 2556 2557 2558 2559
/* 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);

2560 2561
static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb)
{
2562
	return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb));
2563 2564
}

T
Tom Herbert 已提交
2565 2566 2567 2568
static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
						      bool zero_okay,
						      __sum16 check)
{
2569 2570 2571
	return ((skb->ip_summed != CHECKSUM_PARTIAL ||
		skb_checksum_start_offset(skb) <
		 skb_gro_offset(skb)) &&
2572
		!skb_at_gro_remcsum_start(skb) &&
2573
		NAPI_GRO_CB(skb)->csum_cnt == 0 &&
T
Tom Herbert 已提交
2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590
		(!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)
{
2591 2592 2593 2594 2595 2596 2597 2598 2599
	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
2600 2601 2602 2603 2604 2605 2606 2607 2608 2609
	}
}

#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));		\
2610
	if (!__ret)							\
T
Tom Herbert 已提交
2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
		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)

2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644
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)

2645 2646 2647 2648 2649 2650 2651
struct gro_remcsum {
	int offset;
	__wsum delta;
};

static inline void skb_gro_remcsum_init(struct gro_remcsum *grc)
{
2652
	grc->offset = 0;
2653 2654 2655
	grc->delta = 0;
}

2656 2657 2658 2659 2660
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)
2661 2662
{
	__wsum delta;
2663
	size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start);
2664 2665 2666

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

2667
	if (!nopartial) {
2668 2669 2670 2671 2672 2673 2674 2675 2676
		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;
2677 2678
	}

2679 2680
	delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum,
			       start, offset);
2681 2682 2683

	/* Adjust skb->csum since we changed the packet */
	NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
2684

2685
	grc->offset = off + hdrlen + offset;
2686
	grc->delta = delta;
2687 2688

	return ptr;
2689 2690
}

2691 2692 2693
static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb,
					   struct gro_remcsum *grc)
{
2694 2695 2696
	void *ptr;
	size_t plen = grc->offset + sizeof(u16);

2697 2698 2699
	if (!grc->delta)
		return;

2700 2701 2702 2703 2704 2705 2706 2707
	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);
2708
}
2709

2710 2711 2712 2713 2714 2715 2716
#ifdef CONFIG_XFRM_OFFLOAD
static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush)
{
	if (PTR_ERR(pp) != -EINPROGRESS)
		NAPI_GRO_CB(skb)->flush |= flush;
}
#else
2717 2718 2719 2720
static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff **pp, int flush)
{
	NAPI_GRO_CB(skb)->flush |= flush;
}
2721
#endif
2722

2723 2724
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
2725
				  const void *daddr, const void *saddr,
2726
				  unsigned int len)
2727
{
2728
	if (!dev->header_ops || !dev->header_ops->create)
2729
		return 0;
2730 2731

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
2732 2733
}

S
Stephen Hemminger 已提交
2734 2735 2736 2737 2738
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

2739
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
2740
		return 0;
2741
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
2742 2743
}

2744 2745 2746 2747 2748 2749
/* 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;
2750 2751
	if (len < dev->min_header_len)
		return false;
2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763

	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;
}

2764 2765
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr,
			   int len, int size);
2766
int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
L
Linus Torvalds 已提交
2767 2768 2769 2770 2771
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

2772
#ifdef CONFIG_NET_FLOW_LIMIT
2773
#define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784
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
2785
/*
B
Bjorn Helgaas 已提交
2786
 * Incoming packets are placed on per-CPU queues
L
Linus Torvalds 已提交
2787
 */
E
Eric Dumazet 已提交
2788
struct softnet_data {
L
Linus Torvalds 已提交
2789
	struct list_head	poll_list;
2790
	struct sk_buff_head	process_queue;
L
Linus Torvalds 已提交
2791

C
Changli Gao 已提交
2792
	/* stats */
2793 2794 2795
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		received_rps;
2796
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
2797
	struct softnet_data	*rps_ipi_list;
E
Eric Dumazet 已提交
2798 2799 2800 2801 2802 2803 2804
#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;
2805 2806 2807
#ifdef CONFIG_XFRM_OFFLOAD
	struct sk_buff_head	xfrm_backlog;
#endif
E
Eric Dumazet 已提交
2808
#ifdef CONFIG_RPS
2809 2810 2811 2812 2813 2814
	/* 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 */
2815
	call_single_data_t	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
2816 2817
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
2818
	unsigned int		input_queue_tail;
2819
#endif
2820
	unsigned int		dropped;
T
Tom Herbert 已提交
2821
	struct sk_buff_head	input_pkt_queue;
2822
	struct napi_struct	backlog;
2823

L
Linus Torvalds 已提交
2824 2825
};

2826
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
2827 2828
{
#ifdef CONFIG_RPS
2829 2830 2831 2832 2833 2834 2835 2836 2837
	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
2838 2839 2840
#endif
}

T
Tom Herbert 已提交
2841
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
2842

2843
void __netif_schedule(struct Qdisc *q);
2844
void netif_schedule_queue(struct netdev_queue *txq);
2845

2846 2847 2848 2849 2850 2851 2852 2853
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));
}

2854
static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
2855
{
2856
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2857 2858
}

2859 2860 2861 2862 2863 2864
/**
 *	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
2865 2866
static inline void netif_start_queue(struct net_device *dev)
{
2867
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2868 2869
}

2870 2871 2872 2873 2874 2875 2876 2877 2878 2879
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);
	}
}

2880
void netif_tx_wake_queue(struct netdev_queue *dev_queue);
2881

2882 2883 2884 2885 2886 2887 2888
/**
 *	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.
 */
2889 2890
static inline void netif_wake_queue(struct net_device *dev)
{
2891
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2892 2893
}

2894 2895 2896 2897 2898 2899 2900 2901 2902 2903
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);
	}
}

2904
static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
2905
{
2906
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2907 2908
}

2909 2910 2911 2912 2913 2914 2915
/**
 *	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
2916 2917
static inline void netif_stop_queue(struct net_device *dev)
{
2918
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2919 2920
}

2921
void netif_tx_stop_all_queues(struct net_device *dev);
2922

2923
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2924
{
2925
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2926 2927
}

2928 2929 2930 2931 2932 2933
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
2934
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
2935
{
2936
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2937 2938
}

2939
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2940
{
2941 2942 2943
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

2944 2945
static inline bool
netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2946 2947 2948 2949
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

2950 2951 2952 2953 2954 2955
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;
}

2956 2957 2958 2959 2960
/**
 *	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
2961
 * to give appropriate hint to the CPU.
2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974
 */
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
2975
 * to give appropriate hint to the CPU.
2976 2977 2978 2979 2980 2981 2982 2983
 */
static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
{
#ifdef CONFIG_BQL
	prefetchw(&dev_queue->dql.limit);
#endif
}

2984 2985 2986
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
2987 2988
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004

	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
3005
#endif
3006 3007
}

3008 3009 3010 3011 3012 3013 3014 3015 3016
/**
 * 	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
 */
3017 3018 3019 3020 3021 3022
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,
3023
					     unsigned int pkts, unsigned int bytes)
3024
{
T
Tom Herbert 已提交
3025
#ifdef CONFIG_BQL
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042
	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
3043
#endif
3044 3045
}

3046 3047 3048 3049 3050 3051 3052 3053 3054 3055
/**
 * 	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()
 */
3056
static inline void netdev_completed_queue(struct net_device *dev,
3057
					  unsigned int pkts, unsigned int bytes)
3058 3059 3060 3061 3062 3063
{
	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
3064
#ifdef CONFIG_BQL
3065
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
3066 3067
	dql_reset(&q->dql);
#endif
3068 3069
}

3070 3071 3072 3073 3074 3075 3076
/**
 * 	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
 */
3077 3078 3079
static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
3080 3081
}

3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101
/**
 * 	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;
}

3102 3103 3104 3105 3106 3107
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
3108
static inline bool netif_running(const struct net_device *dev)
L
Linus Torvalds 已提交
3109 3110 3111 3112
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

3113
/*
B
Bjorn Helgaas 已提交
3114
 * Routines to manage the subqueues on a device.  We only need start,
3115 3116 3117 3118
 * 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.
 */
3119 3120 3121 3122 3123 3124 3125 3126

/**
 *	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.
 */
3127 3128
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
3129
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3130 3131

	netif_tx_start_queue(txq);
3132 3133
}

3134 3135 3136 3137 3138 3139 3140
/**
 *	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.
 */
3141 3142
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
3143
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3144
	netif_tx_stop_queue(txq);
3145 3146
}

3147 3148 3149 3150 3151 3152 3153
/**
 *	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.
 */
3154 3155
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
3156
{
3157
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
3158 3159

	return netif_tx_queue_stopped(txq);
3160 3161
}

3162 3163
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
3164 3165 3166
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
3167

3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180
/**
 *	netif_wake_subqueue - allow sending packets on subqueue
 *	@dev: network device
 *	@queue_index: sub queue index
 *
 * Resume individual transmit queue of a device with multiple transmit queues.
 */
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);

	netif_tx_wake_queue(txq);
}
3181

3182
#ifdef CONFIG_XPS
3183
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
3184
			u16 index);
3185 3186
#else
static inline int netif_set_xps_queue(struct net_device *dev,
3187
				      const struct cpumask *mask,
3188 3189 3190 3191 3192 3193
				      u16 index)
{
	return 0;
}
#endif

J
Jiri Pirko 已提交
3194 3195 3196
u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
		  unsigned int num_tx_queues);

3197 3198 3199 3200 3201
/*
 * 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,
3202
			      struct sk_buff *skb)
3203 3204 3205 3206
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

3207 3208 3209 3210 3211 3212
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
3213
static inline bool netif_is_multiqueue(const struct net_device *dev)
3214
{
E
Eric Dumazet 已提交
3215
	return dev->num_tx_queues > 1;
3216
}
L
Linus Torvalds 已提交
3217

3218
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
3219

3220
#ifdef CONFIG_SYSFS
3221
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
3222 3223 3224 3225 3226 3227 3228 3229
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
#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

3242
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
3243
int netif_get_num_default_rss_queues(void);
3244

3245 3246 3247 3248 3249 3250 3251
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
3252

3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270
/*
 * 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
3271
 */
3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290
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
3291

3292 3293
void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog);
int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb);
3294 3295
int netif_rx(struct sk_buff *skb);
int netif_rx_ni(struct sk_buff *skb);
3296
int netif_receive_skb(struct sk_buff *skb);
3297
int netif_receive_skb_core(struct sk_buff *skb);
3298 3299 3300 3301
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);
3302 3303
struct packet_offload *gro_find_receive_by_type(__be16 type);
struct packet_offload *gro_find_complete_by_type(__be16 type);
3304 3305 3306 3307 3308 3309 3310

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

M
Mahesh Bandewar 已提交
3311
bool netdev_is_rx_handler_busy(struct net_device *dev);
3312 3313 3314 3315 3316 3317 3318
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 *);
3319
int dev_ifconf(struct net *net, struct ifconf *, int);
3320 3321 3322 3323
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);
3324 3325
void __dev_notify_flags(struct net_device *, unsigned int old_flags,
			unsigned int gchanges);
3326 3327
int dev_change_name(struct net_device *, const char *);
int dev_set_alias(struct net_device *, const char *, size_t);
3328
int dev_get_alias(const struct net_device *, char *, size_t);
3329
int dev_change_net_namespace(struct net_device *, struct net *, const char *);
3330
int __dev_set_mtu(struct net_device *, int);
3331 3332 3333 3334 3335
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,
3336
			 struct netdev_phys_item_id *ppid);
3337 3338
int dev_get_phys_port_name(struct net_device *dev,
			   char *name, size_t len);
3339
int dev_change_proto_down(struct net_device *dev, bool proto_down);
3340
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again);
3341 3342
struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
				    struct netdev_queue *txq, int *ret);
3343

3344
typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
3345 3346
int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
		      int fd, u32 flags);
3347 3348
void __dev_xdp_query(struct net_device *dev, bpf_op_t xdp_op,
		     struct netdev_bpf *xdp);
3349

H
Herbert Xu 已提交
3350
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3351
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
3352 3353
bool is_skb_forwardable(const struct net_device *dev,
			const struct sk_buff *skb);
L
Linus Torvalds 已提交
3354

3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369
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;
}

3370 3371
void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);

3372
extern int		netdev_budget;
3373
extern unsigned int	netdev_budget_usecs;
L
Linus Torvalds 已提交
3374 3375

/* Called by rtnetlink.c:rtnl_unlock() */
3376
void netdev_run_todo(void);
L
Linus Torvalds 已提交
3377

3378 3379 3380 3381
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
3382
 * Release reference to device to allow it to be freed.
3383
 */
L
Linus Torvalds 已提交
3384 3385
static inline void dev_put(struct net_device *dev)
{
3386
	this_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
3387 3388
}

3389 3390 3391 3392
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
3393
 * Hold reference to device to keep it from being freed.
3394
 */
3395 3396
static inline void dev_hold(struct net_device *dev)
{
3397
	this_cpu_inc(*dev->pcpu_refcnt);
3398
}
L
Linus Torvalds 已提交
3399 3400 3401 3402

/* 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
3403 3404 3405 3406
 *
 * 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
3407 3408
 */

3409 3410 3411
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
3412

3413 3414 3415 3416 3417 3418
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
3419
static inline bool netif_carrier_ok(const struct net_device *dev)
L
Linus Torvalds 已提交
3420 3421 3422 3423
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

3424
unsigned long dev_trans_start(struct net_device *dev);
3425

3426
void __netdev_watchdog_up(struct net_device *dev);
L
Linus Torvalds 已提交
3427

3428
void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
3429

3430
void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
3431

3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443
/**
 *	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
3444 3445 3446 3447 3448 3449
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

3450 3451 3452 3453 3454 3455
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
3456 3457 3458 3459 3460 3461
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

3462
/**
3463
 *	netif_dormant - test if device is dormant
3464 3465
 *	@dev: network device
 *
3466
 * Check if device is dormant.
3467
 */
3468
static inline bool netif_dormant(const struct net_device *dev)
S
Stefan Rompf 已提交
3469 3470 3471 3472 3473
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


3474 3475 3476 3477 3478 3479
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
3480
static inline bool netif_oper_up(const struct net_device *dev)
E
Eric Dumazet 已提交
3481
{
S
Stefan Rompf 已提交
3482 3483 3484 3485
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

3486 3487 3488 3489 3490 3491
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
3492
static inline bool netif_device_present(struct net_device *dev)
L
Linus Torvalds 已提交
3493 3494 3495 3496
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

3497
void netif_device_detach(struct net_device *dev);
L
Linus Torvalds 已提交
3498

3499
void netif_device_attach(struct net_device *dev);
L
Linus Torvalds 已提交
3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549

/*
 * 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;
}

3550
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
3551
{
3552 3553
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
3554 3555
}

3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566
static inline bool __netif_tx_acquire(struct netdev_queue *txq)
{
	__acquire(&txq->_xmit_lock);
	return true;
}

static inline void __netif_tx_release(struct netdev_queue *txq)
{
	__release(&txq->_xmit_lock);
}

3567 3568 3569 3570 3571 3572
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

3573
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
3574
{
3575
	bool ok = spin_trylock(&txq->_xmit_lock);
3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592
	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
3593 3594 3595 3596 3597 3598
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

3599 3600 3601
/* 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
3602 3603 3604 3605
	struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);

	if (txq->trans_start != jiffies)
		txq->trans_start = jiffies;
3606 3607
}

3608 3609 3610 3611 3612 3613
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
3614 3615
static inline void netif_tx_lock(struct net_device *dev)
{
3616
	unsigned int i;
3617
	int cpu;
3618

3619 3620
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
3621 3622
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3623 3624 3625 3626 3627 3628 3629

		/* 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.
		 */
3630
		__netif_tx_lock(txq, cpu);
3631 3632
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
3633
	}
H
Herbert Xu 已提交
3634 3635 3636 3637
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
3638 3639
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
3640 3641 3642 3643
}

static inline void netif_tx_unlock(struct net_device *dev)
{
3644 3645 3646 3647
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3648

3649 3650 3651 3652 3653
		/* 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);
3654
		netif_schedule_queue(txq);
3655 3656
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
3657 3658 3659 3660
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
3661 3662
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
3663 3664
}

3665
#define HARD_TX_LOCK(dev, txq, cpu) {			\
3666
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3667
		__netif_tx_lock(txq, cpu);		\
3668 3669
	} else {					\
		__netif_tx_acquire(txq);		\
3670 3671 3672
	}						\
}

3673 3674 3675
#define HARD_TX_TRYLOCK(dev, txq)			\
	(((dev->features & NETIF_F_LLTX) == 0) ?	\
		__netif_tx_trylock(txq) :		\
3676
		__netif_tx_acquire(txq))
3677

3678
#define HARD_TX_UNLOCK(dev, txq) {			\
3679
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3680
		__netif_tx_unlock(txq);			\
3681 3682
	} else {					\
		__netif_tx_release(txq);		\
3683 3684 3685
	}						\
}

L
Linus Torvalds 已提交
3686 3687
static inline void netif_tx_disable(struct net_device *dev)
{
3688
	unsigned int i;
3689
	int cpu;
3690

3691 3692
	local_bh_disable();
	cpu = smp_processor_id();
3693 3694
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3695 3696

		__netif_tx_lock(txq, cpu);
3697
		netif_tx_stop_queue(txq);
3698
		__netif_tx_unlock(txq);
3699
	}
3700
	local_bh_enable();
L
Linus Torvalds 已提交
3701 3702
}

3703 3704 3705 3706 3707
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

3708 3709
static inline void netif_addr_lock_nested(struct net_device *dev)
{
3710 3711 3712 3713 3714 3715
	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);
3716 3717
}

3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732
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);
}

3733
/*
3734
 * dev_addrs walker. Should be used only for read access. Call with
3735 3736 3737
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
3738
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
3739

L
Linus Torvalds 已提交
3740 3741
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

3742
void ether_setup(struct net_device *dev);
L
Linus Torvalds 已提交
3743 3744

/* Support for loadable net-drivers */
3745
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
3746
				    unsigned char name_assign_type,
3747 3748
				    void (*setup)(struct net_device *),
				    unsigned int txqs, unsigned int rxqs);
3749 3750 3751
int dev_get_valid_name(struct net *net, struct net_device *dev,
		       const char *name);

3752 3753
#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
3754

3755 3756 3757
#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
3758

3759 3760
int register_netdev(struct net_device *dev);
void unregister_netdev(struct net_device *dev);
3761

3762
/* General hardware address lists handling functions */
3763 3764 3765 3766
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);
3767 3768 3769 3770 3771 3772 3773 3774 3775
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 *));
3776
void __hw_addr_init(struct netdev_hw_addr_list *list);
3777

3778
/* Functions used for device addresses handling */
3779 3780 3781 3782 3783 3784
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);
3785 3786

/* Functions used for unicast addresses handling */
3787 3788 3789 3790 3791 3792 3793 3794
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);
3795

3796 3797 3798 3799 3800 3801 3802 3803
/**
 *  __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
3804
 */
3805 3806 3807 3808 3809 3810 3811 3812 3813 3814
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);
}

/**
3815
 *  __dev_uc_unsync - Remove synchronized addresses from device
3816 3817 3818 3819
 *  @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
3820
 */
3821 3822 3823 3824 3825 3826 3827
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);
}

3828
/* Functions used for multicast addresses handling */
3829 3830 3831 3832 3833 3834 3835 3836 3837 3838
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);
3839

3840 3841 3842 3843 3844 3845 3846 3847
/**
 *  __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
3848
 */
3849 3850 3851 3852 3853 3854 3855 3856 3857 3858
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);
}

/**
3859
 *  __dev_mc_unsync - Remove synchronized addresses from device
3860 3861 3862 3863
 *  @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
3864
 */
3865 3866 3867 3868 3869 3870 3871
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);
}

3872
/* Functions used for secondary unicast and multicast support */
3873 3874 3875 3876 3877 3878 3879
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
3880
/* Load a device via the kmod */
3881 3882 3883 3884 3885
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);
3886

L
Linus Torvalds 已提交
3887
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
3888
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
3889
extern int		weight_p;
3890 3891 3892 3893
extern int		dev_weight_rx_bias;
extern int		dev_weight_tx_bias;
extern int		dev_rx_weight;
extern int		dev_tx_weight;
J
Jiri Pirko 已提交
3894

3895
bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
3896 3897
struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3898 3899
struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3900

3901 3902 3903 3904 3905 3906 3907
/* 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)))

3908 3909 3910 3911 3912 3913 3914 3915
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);

3916 3917
bool netdev_has_any_upper_dev(struct net_device *dev);

3918 3919 3920 3921
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);
3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934

#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)))

3935 3936
void *netdev_lower_get_next(struct net_device *dev,
				struct list_head **iter);
3937

3938
#define netdev_for_each_lower_dev(dev, ldev, iter) \
3939
	for (iter = (dev)->adj_list.lower.next, \
3940 3941 3942 3943
	     ldev = netdev_lower_get_next(dev, &(iter)); \
	     ldev; \
	     ldev = netdev_lower_get_next(dev, &(iter)))

3944 3945 3946 3947 3948
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);

3949 3950 3951 3952 3953 3954 3955 3956 3957
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);

3958
void *netdev_adjacent_get_private(struct list_head *adj_list);
3959
void *netdev_lower_get_first_private_rcu(struct net_device *dev);
3960 3961
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);
3962 3963
int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev,
			  struct netlink_ext_ack *extack);
3964
int netdev_master_upper_dev_link(struct net_device *dev,
3965
				 struct net_device *upper_dev,
3966 3967
				 void *upper_priv, void *upper_info,
				 struct netlink_ext_ack *extack);
3968 3969
void netdev_upper_dev_unlink(struct net_device *dev,
			     struct net_device *upper_dev);
3970
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
3971 3972
void *netdev_lower_dev_get_private(struct net_device *dev,
				   struct net_device *lower_dev);
3973 3974
void netdev_lower_state_changed(struct net_device *lower_dev,
				void *lower_state_info);
3975 3976 3977

/* RSS keys are 40 or 52 bytes long */
#define NETDEV_RSS_KEY_LEN 52
3978
extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
3979 3980
void netdev_rss_key_fill(void *buffer, size_t len);

3981
int dev_get_nest_level(struct net_device *dev);
3982
int skb_checksum_help(struct sk_buff *skb);
3983
int skb_crc32c_csum_help(struct sk_buff *skb);
3984 3985 3986
int skb_csum_hwoffload_help(struct sk_buff *skb,
			    const netdev_features_t features);

3987 3988 3989 3990
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);
3991

3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004
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);

4005 4006 4007 4008 4009
static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
	return __skb_gso_segment(skb, features, true);
}
4010
__be16 skb_network_protocol(struct sk_buff *skb, int *depth);
4011 4012 4013 4014

static inline bool can_checksum_protocol(netdev_features_t features,
					 __be16 protocol)
{
4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032
	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;
	}
4033
}
4034

4035
#ifdef CONFIG_BUG
4036
void netdev_rx_csum_fault(struct net_device *dev);
4037 4038 4039 4040 4041
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
L
Linus Torvalds 已提交
4042
/* rx skb timestamps */
4043 4044
void net_enable_timestamp(void);
void net_disable_timestamp(void);
L
Linus Torvalds 已提交
4045

4046
#ifdef CONFIG_PROC_FS
4047
int __init dev_proc_init(void);
4048 4049
#else
#define dev_proc_init() 0
4050 4051
#endif

D
David S. Miller 已提交
4052
static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
4053 4054
					      struct sk_buff *skb, struct net_device *dev,
					      bool more)
D
David S. Miller 已提交
4055
{
4056
	skb->xmit_more = more ? 1 : 0;
4057
	return ops->ndo_start_xmit(skb, dev);
D
David S. Miller 已提交
4058 4059
}

4060
static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
4061
					    struct netdev_queue *txq, bool more)
D
David S. Miller 已提交
4062 4063
{
	const struct net_device_ops *ops = dev->netdev_ops;
4064
	int rc;
D
David S. Miller 已提交
4065

4066
	rc = __netdev_start_xmit(ops, skb, dev, more);
4067 4068 4069 4070
	if (rc == NETDEV_TX_OK)
		txq_trans_update(txq);

	return rc;
D
David S. Miller 已提交
4071 4072
}

4073
int netdev_class_create_file_ns(const struct class_attribute *class_attr,
4074
				const void *ns);
4075
void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
4076
				 const void *ns);
4077

4078
static inline int netdev_class_create_file(const struct class_attribute *class_attr)
4079 4080 4081 4082
{
	return netdev_class_create_file_ns(class_attr, NULL);
}

4083
static inline void netdev_class_remove_file(const struct class_attribute *class_attr)
4084 4085 4086
{
	netdev_class_remove_file_ns(class_attr, NULL);
}
4087

4088
extern const struct kobj_ns_type_operations net_ns_type_operations;
4089

4090
const char *netdev_drivername(const struct net_device *dev);
4091

4092
void linkwatch_run_queue(void);
4093

4094 4095 4096
static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
							  netdev_features_t f2)
{
4097 4098
	if ((f1 ^ f2) & NETIF_F_HW_CSUM) {
		if (f1 & NETIF_F_HW_CSUM)
4099
			f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4100
		else
4101
			f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4102
	}
4103

4104
	return f1 & f2;
4105 4106
}

4107 4108
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
4109 4110 4111
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
4112 4113
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124

/* 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);
}

4125
int __netdev_update_features(struct net_device *dev);
4126
void netdev_update_features(struct net_device *dev);
4127
void netdev_change_features(struct net_device *dev);
4128

4129 4130 4131
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

4132 4133 4134
netdev_features_t passthru_features_check(struct sk_buff *skb,
					  struct net_device *dev,
					  netdev_features_t features);
4135
netdev_features_t netif_skb_features(struct sk_buff *skb);
4136

4137
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
4138
{
4139
	netdev_features_t feature = (netdev_features_t)gso_type << NETIF_F_GSO_SHIFT;
4140 4141 4142 4143 4144

	/* check flags correspondence */
	BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> 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));
4145
	BUILD_BUG_ON(SKB_GSO_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> NETIF_F_GSO_SHIFT));
4146 4147
	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));
4148 4149
	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));
4150 4151
	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));
4152 4153
	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));
4154
	BUILD_BUG_ON(SKB_GSO_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT));
4155
	BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
M
Marcelo Ricardo Leitner 已提交
4156
	BUILD_BUG_ON(SKB_GSO_SCTP    != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT));
S
Steffen Klassert 已提交
4157
	BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT));
4158
	BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT));
4159

4160
	return (features & feature) == feature;
4161 4162
}

4163
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
4164
{
H
Herbert Xu 已提交
4165
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
4166
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
4167 4168
}

4169
static inline bool netif_needs_gso(struct sk_buff *skb,
4170
				   netdev_features_t features)
4171
{
4172
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
4173 4174
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
4175 4176
}

4177 4178 4179 4180 4181 4182
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195
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;
}

4196 4197 4198 4199 4200
static inline bool netif_is_macsec(const struct net_device *dev)
{
	return dev->priv_flags & IFF_MACSEC;
}

4201
static inline bool netif_is_macvlan(const struct net_device *dev)
4202 4203 4204 4205
{
	return dev->priv_flags & IFF_MACVLAN;
}

4206
static inline bool netif_is_macvlan_port(const struct net_device *dev)
4207 4208 4209 4210
{
	return dev->priv_flags & IFF_MACVLAN_PORT;
}

4211
static inline bool netif_is_ipvlan(const struct net_device *dev)
4212 4213 4214 4215
{
	return dev->priv_flags & IFF_IPVLAN_SLAVE;
}

4216
static inline bool netif_is_ipvlan_port(const struct net_device *dev)
4217 4218 4219 4220
{
	return dev->priv_flags & IFF_IPVLAN_MASTER;
}

4221
static inline bool netif_is_bond_master(const struct net_device *dev)
4222 4223 4224 4225
{
	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
}

4226
static inline bool netif_is_bond_slave(const struct net_device *dev)
J
Jiri Pirko 已提交
4227 4228 4229 4230
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

4231 4232 4233 4234 4235
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

4236
static inline bool netif_is_l3_master(const struct net_device *dev)
4237
{
4238
	return dev->priv_flags & IFF_L3MDEV_MASTER;
4239 4240
}

D
David Ahern 已提交
4241 4242 4243 4244 4245
static inline bool netif_is_l3_slave(const struct net_device *dev)
{
	return dev->priv_flags & IFF_L3MDEV_SLAVE;
}

4246 4247 4248 4249 4250
static inline bool netif_is_bridge_master(const struct net_device *dev)
{
	return dev->priv_flags & IFF_EBRIDGE;
}

4251 4252 4253 4254 4255
static inline bool netif_is_bridge_port(const struct net_device *dev)
{
	return dev->priv_flags & IFF_BRIDGE_PORT;
}

4256 4257 4258 4259 4260
static inline bool netif_is_ovs_master(const struct net_device *dev)
{
	return dev->priv_flags & IFF_OPENVSWITCH;
}

J
Jiri Pirko 已提交
4261 4262 4263 4264 4265
static inline bool netif_is_ovs_port(const struct net_device *dev)
{
	return dev->priv_flags & IFF_OVS_DATAPATH;
}

4266
static inline bool netif_is_team_master(const struct net_device *dev)
J
Jiri Pirko 已提交
4267 4268 4269 4270
{
	return dev->priv_flags & IFF_TEAM;
}

4271
static inline bool netif_is_team_port(const struct net_device *dev)
J
Jiri Pirko 已提交
4272 4273 4274 4275
{
	return dev->priv_flags & IFF_TEAM_PORT;
}

4276
static inline bool netif_is_lag_master(const struct net_device *dev)
J
Jiri Pirko 已提交
4277 4278 4279 4280
{
	return netif_is_bond_master(dev) || netif_is_team_master(dev);
}

4281
static inline bool netif_is_lag_port(const struct net_device *dev)
J
Jiri Pirko 已提交
4282 4283 4284 4285
{
	return netif_is_bond_slave(dev) || netif_is_team_port(dev);
}

4286 4287 4288 4289 4290
static inline bool netif_is_rxfh_configured(const struct net_device *dev)
{
	return dev->priv_flags & IFF_RXFH_CONFIGURED;
}

4291 4292 4293 4294 4295 4296
/* 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);
}

4297 4298 4299 4300 4301 4302 4303
/* 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;
}

4304
extern struct pernet_operations __net_initdata loopback_net_ops;
4305

4306 4307 4308 4309 4310 4311
/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

static inline const char *netdev_name(const struct net_device *dev)
{
4312 4313
	if (!dev->name[0] || strchr(dev->name, '%'))
		return "(unnamed net_device)";
4314 4315 4316
	return dev->name;
}

4317 4318 4319 4320 4321
static inline bool netdev_unregistering(const struct net_device *dev)
{
	return dev->reg_state == NETREG_UNREGISTERING;
}

4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336
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)";
}

4337
__printf(3, 4)
4338 4339
void netdev_printk(const char *level, const struct net_device *dev,
		   const char *format, ...);
4340
__printf(2, 3)
4341
void netdev_emerg(const struct net_device *dev, const char *format, ...);
4342
__printf(2, 3)
4343
void netdev_alert(const struct net_device *dev, const char *format, ...);
4344
__printf(2, 3)
4345
void netdev_crit(const struct net_device *dev, const char *format, ...);
4346
__printf(2, 3)
4347
void netdev_err(const struct net_device *dev, const char *format, ...);
4348
__printf(2, 3)
4349
void netdev_warn(const struct net_device *dev, const char *format, ...);
4350
__printf(2, 3)
4351
void netdev_notice(const struct net_device *dev, const char *format, ...);
4352
__printf(2, 3)
4353
void netdev_info(const struct net_device *dev, const char *format, ...);
4354

4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379
#define netdev_level_once(level, dev, fmt, ...)			\
do {								\
	static bool __print_once __read_mostly;			\
								\
	if (!__print_once) {					\
		__print_once = true;				\
		netdev_printk(level, dev, fmt, ##__VA_ARGS__);	\
	}							\
} while (0)

#define netdev_emerg_once(dev, fmt, ...) \
	netdev_level_once(KERN_EMERG, dev, fmt, ##__VA_ARGS__)
#define netdev_alert_once(dev, fmt, ...) \
	netdev_level_once(KERN_ALERT, dev, fmt, ##__VA_ARGS__)
#define netdev_crit_once(dev, fmt, ...) \
	netdev_level_once(KERN_CRIT, dev, fmt, ##__VA_ARGS__)
#define netdev_err_once(dev, fmt, ...) \
	netdev_level_once(KERN_ERR, dev, fmt, ##__VA_ARGS__)
#define netdev_warn_once(dev, fmt, ...) \
	netdev_level_once(KERN_WARNING, dev, fmt, ##__VA_ARGS__)
#define netdev_notice_once(dev, fmt, ...) \
	netdev_level_once(KERN_NOTICE, dev, fmt, ##__VA_ARGS__)
#define netdev_info_once(dev, fmt, ...) \
	netdev_level_once(KERN_INFO, dev, fmt, ##__VA_ARGS__)

4380 4381 4382
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

4383
#if defined(CONFIG_DYNAMIC_DEBUG)
4384 4385
#define netdev_dbg(__dev, format, args...)			\
do {								\
4386
	dynamic_netdev_dbg(__dev, format, ##args);		\
4387
} while (0)
4388 4389 4390
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416
#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...)			\
4417
	WARN(1, "netdevice: %s%s: " format, netdev_name(dev),	\
4418
	     netdev_reg_state(dev), ##args)
4419

G
Gal Pressman 已提交
4420
#define netdev_WARN_ONCE(dev, format, args...)				\
4421
	WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev),	\
4422 4423
		  netdev_reg_state(dev), ##args)

4424 4425 4426 4427 4428 4429 4430 4431
/* 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)

4432 4433 4434 4435 4436 4437
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

4438
#define netif_emerg(priv, type, dev, fmt, args...)		\
4439
	netif_level(emerg, priv, type, dev, fmt, ##args)
4440
#define netif_alert(priv, type, dev, fmt, args...)		\
4441
	netif_level(alert, priv, type, dev, fmt, ##args)
4442
#define netif_crit(priv, type, dev, fmt, args...)		\
4443
	netif_level(crit, priv, type, dev, fmt, ##args)
4444
#define netif_err(priv, type, dev, fmt, args...)		\
4445
	netif_level(err, priv, type, dev, fmt, ##args)
4446
#define netif_warn(priv, type, dev, fmt, args...)		\
4447
	netif_level(warn, priv, type, dev, fmt, ##args)
4448
#define netif_notice(priv, type, dev, fmt, args...)		\
4449
	netif_level(notice, priv, type, dev, fmt, ##args)
4450
#define netif_info(priv, type, dev, fmt, args...)		\
4451
	netif_level(info, priv, type, dev, fmt, ##args)
4452

4453
#if defined(CONFIG_DYNAMIC_DEBUG)
4454 4455 4456
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
4457
		dynamic_netdev_dbg(netdev, format, ##args);	\
4458
} while (0)
4459 4460 4461
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
4462 4463 4464 4465 4466 4467 4468 4469 4470
#else
#define netif_dbg(priv, type, dev, format, args...)			\
({									\
	if (0)								\
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
	0;								\
})
#endif

4471 4472 4473 4474 4475 4476 4477 4478 4479
/* if @cond then downgrade to debug, else print at @level */
#define netif_cond_dbg(priv, type, netdev, cond, level, fmt, args...)     \
	do {                                                              \
		if (cond)                                                 \
			netif_dbg(priv, type, netdev, fmt, ##args);       \
		else                                                      \
			netif_ ## level(priv, type, netdev, fmt, ##args); \
	} while (0)

4480
#if defined(VERBOSE_DEBUG)
4481
#define netif_vdbg	netif_dbg
4482 4483 4484 4485
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
4486
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
4487 4488 4489
	0;							\
})
#endif
4490

4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512
/*
 *	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.
 *
 *		0800	IP
 *		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)

4513
#endif	/* _LINUX_NETDEVICE_H */