netdevice.h 95.1 KB
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/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the Interfaces handler.
 *
 * Version:	@(#)dev.h	1.0.10	08/12/93
 *
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 * Authors:	Ross Biro
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 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Corey Minyard <wf-rch!minyard@relay.EU.net>
 *		Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
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 *		Alan Cox, <alan@lxorguk.ukuu.org.uk>
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 *		Bjorn Ekwall. <bj0rn@blox.se>
 *              Pekka Riikonen <priikone@poseidon.pspt.fi>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *		Moved to /usr/include/linux for NET3
 */
#ifndef _LINUX_NETDEVICE_H
#define _LINUX_NETDEVICE_H

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#include <linux/pm_qos.h>
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#include <linux/timer.h>
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#include <linux/bug.h>
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#include <linux/delay.h>
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#include <linux/atomic.h>
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#include <asm/cache.h>
#include <asm/byteorder.h>

#include <linux/percpu.h>
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#include <linux/rculist.h>
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#include <linux/dmaengine.h>
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#include <linux/workqueue.h>
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#include <linux/dynamic_queue_limits.h>
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#include <linux/ethtool.h>
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#include <net/net_namespace.h>
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#include <net/dsa.h>
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#ifdef CONFIG_DCB
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#include <net/dcbnl.h>
#endif
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#include <net/netprio_cgroup.h>
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#include <linux/netdev_features.h>
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#include <linux/neighbour.h>
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#include <uapi/linux/netdevice.h>
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struct netpoll_info;
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struct device;
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struct phy_device;
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/* 802.11 specific */
struct wireless_dev;
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					/* source back-compat hooks */
#define SET_ETHTOOL_OPS(netdev,ops) \
	( (netdev)->ethtool_ops = (ops) )

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

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

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

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

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

	return false;
}

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

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

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


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

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

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struct neighbour;
struct neigh_parms;
struct sk_buff;

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

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

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

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

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

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


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

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int __init netdev_boot_setup(char *str);
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/*
 * Structure for NAPI scheduling similar to tasklet but with weighting
 */
struct napi_struct {
	/* The poll_list must only be managed by the entity which
	 * changes the state of the NAPI_STATE_SCHED bit.  This means
	 * whoever atomically sets that bit can add this napi_struct
	 * to the per-cpu poll_list, and whoever clears that bit
	 * can remove from the list right before clearing the bit.
	 */
	struct list_head	poll_list;

	unsigned long		state;
	int			weight;
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	unsigned int		gro_count;
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	int			(*poll)(struct napi_struct *, int);
#ifdef CONFIG_NETPOLL
	spinlock_t		poll_lock;
	int			poll_owner;
#endif
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	struct net_device	*dev;
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	struct sk_buff		*gro_list;
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	struct sk_buff		*skb;
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	struct list_head	dev_list;
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	struct hlist_node	napi_hash_node;
	unsigned int		napi_id;
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};

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enum {
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	NAPI_STATE_SCHED,	/* Poll is scheduled */
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	NAPI_STATE_DISABLE,	/* Disable pending */
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	NAPI_STATE_NPSVC,	/* Netpoll - don't dequeue from poll_list */
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	NAPI_STATE_HASHED,	/* In NAPI hash */
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};

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enum gro_result {
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	GRO_MERGED,
	GRO_MERGED_FREE,
	GRO_HELD,
	GRO_NORMAL,
	GRO_DROP,
};
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typedef enum gro_result gro_result_t;
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/*
 * enum rx_handler_result - Possible return values for rx_handlers.
 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
 * further.
 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
 * case skb->dev was changed by rx_handler.
 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
 *
 * rx_handlers are functions called from inside __netif_receive_skb(), to do
 * special processing of the skb, prior to delivery to protocol handlers.
 *
 * Currently, a net_device can only have a single rx_handler registered. Trying
 * to register a second rx_handler will return -EBUSY.
 *
 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
 * To unregister a rx_handler on a net_device, use
 * netdev_rx_handler_unregister().
 *
 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
 * do with the skb.
 *
 * If the rx_handler consumed to skb in some way, it should return
 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
 * the skb to be delivered in some other ways.
 *
 * If the rx_handler changed skb->dev, to divert the skb to another
 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
 * new device will be called if it exists.
 *
 * If the rx_handler consider the skb should be ignored, it should return
 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
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 * are registered on exact device (ptype->dev == skb->dev).
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 *
 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
 * delivered, it should return RX_HANDLER_PASS.
 *
 * A device without a registered rx_handler will behave as if rx_handler
 * returned RX_HANDLER_PASS.
 */

enum rx_handler_result {
	RX_HANDLER_CONSUMED,
	RX_HANDLER_ANOTHER,
	RX_HANDLER_EXACT,
	RX_HANDLER_PASS,
};
typedef enum rx_handler_result rx_handler_result_t;
typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
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void __napi_schedule(struct napi_struct *n);
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static inline bool napi_disable_pending(struct napi_struct *n)
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{
	return test_bit(NAPI_STATE_DISABLE, &n->state);
}

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/**
 *	napi_schedule_prep - check if napi can be scheduled
 *	@n: napi context
 *
 * Test if NAPI routine is already running, and if not mark
 * it as running.  This is used as a condition variable
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 * insure only one NAPI poll instance runs.  We also make
 * sure there is no pending NAPI disable.
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 */
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static inline bool napi_schedule_prep(struct napi_struct *n)
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{
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	return !napi_disable_pending(n) &&
		!test_and_set_bit(NAPI_STATE_SCHED, &n->state);
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}

/**
 *	napi_schedule - schedule NAPI poll
 *	@n: napi context
 *
 * Schedule NAPI poll routine to be called if it is not already
 * running.
 */
static inline void napi_schedule(struct napi_struct *n)
{
	if (napi_schedule_prep(n))
		__napi_schedule(n);
}

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/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
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static inline bool napi_reschedule(struct napi_struct *napi)
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{
	if (napi_schedule_prep(napi)) {
		__napi_schedule(napi);
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		return true;
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	}
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	return false;
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}

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/**
 *	napi_complete - NAPI processing complete
 *	@n: napi context
 *
 * Mark NAPI processing as complete.
 */
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void __napi_complete(struct napi_struct *n);
void napi_complete(struct napi_struct *n);
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/**
 *	napi_by_id - lookup a NAPI by napi_id
 *	@napi_id: hashed napi_id
 *
 * lookup @napi_id in napi_hash table
 * must be called under rcu_read_lock()
 */
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struct napi_struct *napi_by_id(unsigned int napi_id);
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/**
 *	napi_hash_add - add a NAPI to global hashtable
 *	@napi: napi context
 *
 * generate a new napi_id and store a @napi under it in napi_hash
 */
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void napi_hash_add(struct napi_struct *napi);
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/**
 *	napi_hash_del - remove a NAPI from global table
 *	@napi: napi context
 *
 * Warning: caller must observe rcu grace period
 * before freeing memory containing @napi
 */
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void napi_hash_del(struct napi_struct *napi);
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/**
 *	napi_disable - prevent NAPI from scheduling
 *	@n: napi context
 *
 * Stop NAPI from being scheduled on this context.
 * Waits till any outstanding processing completes.
 */
static inline void napi_disable(struct napi_struct *n)
{
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	might_sleep();
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	set_bit(NAPI_STATE_DISABLE, &n->state);
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	while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
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		msleep(1);
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	clear_bit(NAPI_STATE_DISABLE, &n->state);
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}

/**
 *	napi_enable - enable NAPI scheduling
 *	@n: napi context
 *
 * Resume NAPI from being scheduled on this context.
 * Must be paired with napi_disable.
 */
static inline void napi_enable(struct napi_struct *n)
{
	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
	smp_mb__before_clear_bit();
	clear_bit(NAPI_STATE_SCHED, &n->state);
}

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#ifdef CONFIG_SMP
/**
 *	napi_synchronize - wait until NAPI is not running
 *	@n: napi context
 *
 * Wait until NAPI is done being scheduled on this context.
 * Waits till any outstanding processing completes but
 * does not disable future activations.
 */
static inline void napi_synchronize(const struct napi_struct *n)
{
	while (test_bit(NAPI_STATE_SCHED, &n->state))
		msleep(1);
}
#else
# define napi_synchronize(n)	barrier()
#endif

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enum netdev_queue_state_t {
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	__QUEUE_STATE_DRV_XOFF,
	__QUEUE_STATE_STACK_XOFF,
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	__QUEUE_STATE_FROZEN,
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#define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF)		| \
			      (1 << __QUEUE_STATE_STACK_XOFF))
#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF		| \
					(1 << __QUEUE_STATE_FROZEN))
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};
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/*
 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
 * netif_tx_* functions below are used to manipulate this flag.  The
 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
 * queue independently.  The netif_xmit_*stopped functions below are called
 * to check if the queue has been stopped by the driver or stack (either
 * of the XOFF bits are set in the state).  Drivers should not need to call
 * netif_xmit*stopped functions, they should only be using netif_tx_*.
 */
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struct netdev_queue {
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/*
 * read mostly part
 */
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	struct net_device	*dev;
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	struct Qdisc		*qdisc;
	struct Qdisc		*qdisc_sleeping;
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#ifdef CONFIG_SYSFS
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	struct kobject		kobj;
#endif
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#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	int			numa_node;
#endif
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/*
 * write mostly part
 */
	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
	int			xmit_lock_owner;
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	/*
	 * please use this field instead of dev->trans_start
	 */
	unsigned long		trans_start;
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	/*
	 * Number of TX timeouts for this queue
	 * (/sys/class/net/DEV/Q/trans_timeout)
	 */
	unsigned long		trans_timeout;
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	unsigned long		state;

#ifdef CONFIG_BQL
	struct dql		dql;
#endif
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} ____cacheline_aligned_in_smp;
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static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
{
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	return q->numa_node;
#else
585
	return NUMA_NO_NODE;
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#endif
}

static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
{
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	q->numa_node = node;
#endif
}

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#ifdef CONFIG_RPS
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/*
 * This structure holds an RPS map which can be of variable length.  The
 * map is an array of CPUs.
 */
struct rps_map {
	unsigned int len;
	struct rcu_head rcu;
	u16 cpus[0];
};
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#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
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/*
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 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
 * tail pointer for that CPU's input queue at the time of last enqueue, and
 * a hardware filter index.
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 */
struct rps_dev_flow {
	u16 cpu;
615
	u16 filter;
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	unsigned int last_qtail;
};
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#define RPS_NO_FILTER 0xffff
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/*
 * The rps_dev_flow_table structure contains a table of flow mappings.
 */
struct rps_dev_flow_table {
	unsigned int mask;
	struct rcu_head rcu;
	struct rps_dev_flow flows[0];
};
#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
629
    ((_num) * sizeof(struct rps_dev_flow)))
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/*
 * The rps_sock_flow_table contains mappings of flows to the last CPU
 * on which they were processed by the application (set in recvmsg).
 */
struct rps_sock_flow_table {
	unsigned int mask;
	u16 ents[0];
};
#define	RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
640
    ((_num) * sizeof(u16)))
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#define RPS_NO_CPU 0xffff

static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
					u32 hash)
{
	if (table && hash) {
		unsigned int cpu, index = hash & table->mask;

		/* We only give a hint, preemption can change cpu under us */
		cpu = raw_smp_processor_id();

		if (table->ents[index] != cpu)
			table->ents[index] = cpu;
	}
}

static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
				       u32 hash)
{
	if (table && hash)
		table->ents[hash & table->mask] = RPS_NO_CPU;
}

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extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
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667
#ifdef CONFIG_RFS_ACCEL
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bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
			 u16 filter_id);
670 671
#endif

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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
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	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
	struct kobject			kobj;
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	struct net_device		*dev;
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} ____cacheline_aligned_in_smp;
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#endif /* CONFIG_RPS */
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#ifdef CONFIG_XPS
/*
 * This structure holds an XPS map which can be of variable length.  The
 * map is an array of queues.
 */
struct xps_map {
	unsigned int len;
	unsigned int alloc_len;
	struct rcu_head rcu;
	u16 queues[0];
};
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#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
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#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))	\
    / sizeof(u16))

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

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

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

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#define MAX_PHYS_PORT_ID_LEN 32

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

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/*
 * This structure defines the management hooks for network devices.
744 745
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
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 *
 * int (*ndo_init)(struct net_device *dev);
 *     This function is called once when network device is registered.
 *     The network device can use this to any late stage initializaton
 *     or semantic validattion. It can fail with an error code which will
 *     be propogated back to register_netdev
 *
 * void (*ndo_uninit)(struct net_device *dev);
 *     This function is called when device is unregistered or when registration
 *     fails. It is not called if init fails.
 *
 * int (*ndo_open)(struct net_device *dev);
 *     This function is called when network device transistions to the up
 *     state.
 *
 * int (*ndo_stop)(struct net_device *dev);
 *     This function is called when network device transistions to the down
 *     state.
 *
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 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
767
 *	Called when a packet needs to be transmitted.
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 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
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 *	Required can not be NULL.
 *
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 *	Called to decide which queue to when device supports multiple
 *	transmit queues.
 *
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 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 *	This function is called to allow device receiver to make
 *	changes to configuration when multicast or promiscious is enabled.
 *
 * void (*ndo_set_rx_mode)(struct net_device *dev);
 *	This function is called device changes address list filtering.
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 *	If driver handles unicast address filtering, it should set
 *	IFF_UNICAST_FLT to its priv_flags.
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 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *	This function  is called when the Media Access Control address
787
 *	needs to be changed. If this interface is not defined, the
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
 *	mac address can not be changed.
 *
 * int (*ndo_validate_addr)(struct net_device *dev);
 *	Test if Media Access Control address is valid for the device.
 *
 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 *	Called when a user request an ioctl which can't be handled by
 *	the generic interface code. If not defined ioctl's return
 *	not supported error code.
 *
 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 *	Used to set network devices bus interface parameters. This interface
 *	is retained for legacy reason, new devices should use the bus
 *	interface (PCI) for low level management.
 *
 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 *	Called when a user wants to change the Maximum Transfer Unit
 *	of a device. If not defined, any request to change MTU will
 *	will return an error.
 *
808
 * void (*ndo_tx_timeout)(struct net_device *dev);
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 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
812
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
813
 *                      struct rtnl_link_stats64 *storage);
814
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
815
 *	Called when a user wants to get the network device usage
816
 *	statistics. Drivers must do one of the following:
817 818
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
819
 *	2. Define @ndo_get_stats to update a net_device_stats structure
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 *	   (which should normally be dev->stats) and return a pointer to
 *	   it. The structure may be changed asynchronously only if each
 *	   field is written atomically.
 *	3. Update dev->stats asynchronously and atomically, and define
 *	   neither operation.
825
 *
826 827 828
 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16t vid);
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is registered.
829
 *
830
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
831 832
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is unregistered.
833 834
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
835 836 837 838 839
 *
 *	SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
840
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
841 842
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
843
 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
844 845 846
 * 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);
847 848 849 850 851
 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
 * 	Called to setup 'tc' number of traffic classes in the net device. This
 * 	is always called from the stack with the rtnl lock held and netif tx
 * 	queues stopped. This allows the netdevice to perform queue management
 * 	safely.
852
 *
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882
 *	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.
 *
883 884 885 886 887 888 889
 * 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.
 *
890 891 892 893 894 895
 * 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.
 *
896 897 898 899 900 901
 *	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.
902
 *
903
 *	Slave management functions (for bridge, bonding, etc).
904 905 906 907 908
 * 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.
909 910
 *
 *      Feature/offload setting functions.
911 912
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *		netdev_features_t features);
913 914 915 916
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
917
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
918 919 920 921
 *	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.
 *
922 923
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
924
 *		      const unsigned char *addr, u16 flags)
925
 *	Adds an FDB entry to dev for addr.
926 927
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
928
 *		      const unsigned char *addr)
929 930 931 932 933
 *	Deletes the FDB entry from dev coresponding to addr.
 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
 *		       struct net_device *dev, int idx)
 *	Used to add FDB entries to dump requests. Implementers should add
 *	entries to skb and update idx with the number of entries.
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 *
 * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh)
 * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
937
 *			     struct net_device *dev, u32 filter_mask)
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 *
 * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
 *	Called to change device carrier. Soft-devices (like dummy, team, etc)
 *	which do not represent real hardware may define this to allow their
 *	userspace components to manage their virtual carrier state. Devices
 *	that determine carrier state from physical hardware properties (eg
 *	network cables) or protocol-dependent mechanisms (eg
 *	USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
946 947 948 949 950 951
 *
 * int (*ndo_get_phys_port_id)(struct net_device *dev,
 *			       struct netdev_phys_port_id *ppid);
 *	Called to get ID of physical port of this device. If driver does
 *	not implement this, it is assumed that the hw is not able to have
 *	multiple net devices on single physical port.
952 953
 *
 * void (*ndo_add_vxlan_port)(struct  net_device *dev,
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 *			      sa_family_t sa_family, __be16 port);
955 956 957 958 959 960
 *	Called by vxlan to notiy a driver about the UDP port and socket
 *	address family that vxlan is listnening to. It is called only when
 *	a new port starts listening. The operation is protected by the
 *	vxlan_net->sock_lock.
 *
 * void (*ndo_del_vxlan_port)(struct  net_device *dev,
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 *			      sa_family_t sa_family, __be16 port);
962 963 964
 *	Called by vxlan to notify the driver about a UDP port and socket
 *	address family that vxlan is not listening to anymore. The operation
 *	is protected by the vxlan_net->sock_lock.
965 966 967 968 969 970
 */
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);
971
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
972 973 974
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
975 976 977 978 979 980 981 982 983 984
	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);
985 986 987 988
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
989 990
	void			(*ndo_tx_timeout) (struct net_device *dev);

991 992
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
993 994
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

995
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
996
						       __be16 proto, u16 vid);
997
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
998
						        __be16 proto, u16 vid);
999 1000
#ifdef CONFIG_NET_POLL_CONTROLLER
	void                    (*ndo_poll_controller)(struct net_device *dev);
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	int			(*ndo_netpoll_setup)(struct net_device *dev,
1002 1003
						     struct netpoll_info *info,
						     gfp_t gfp);
1004
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
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#endif
1006
#ifdef CONFIG_NET_RX_BUSY_POLL
1007
	int			(*ndo_busy_poll)(struct napi_struct *dev);
1008
#endif
1009 1010 1011 1012 1013 1014
	int			(*ndo_set_vf_mac)(struct net_device *dev,
						  int queue, u8 *mac);
	int			(*ndo_set_vf_vlan)(struct net_device *dev,
						   int queue, u16 vlan, u8 qos);
	int			(*ndo_set_vf_tx_rate)(struct net_device *dev,
						      int vf, int rate);
1015 1016
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
1017 1018 1019
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
1020 1021
	int			(*ndo_set_vf_link_state)(struct net_device *dev,
							 int vf, int link_state);
1022 1023 1024 1025 1026
	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);
1027
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
1028
#if IS_ENABLED(CONFIG_FCOE)
1029 1030
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
1031 1032 1033 1034 1035 1036
	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);
1037 1038 1039 1040
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
1041 1042
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
1043 1044
#endif

1045
#if IS_ENABLED(CONFIG_LIBFCOE)
1046 1047 1048 1049
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
1050
#endif
1051

1052 1053 1054 1055 1056 1057
#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
1058 1059 1060 1061
	int			(*ndo_add_slave)(struct net_device *dev,
						 struct net_device *slave_dev);
	int			(*ndo_del_slave)(struct net_device *dev,
						 struct net_device *slave_dev);
1062 1063
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
1064
	int			(*ndo_set_features)(struct net_device *dev,
1065
						    netdev_features_t features);
1066
	int			(*ndo_neigh_construct)(struct neighbour *n);
1067
	void			(*ndo_neigh_destroy)(struct neighbour *n);
1068 1069

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1070
					       struct nlattr *tb[],
1071
					       struct net_device *dev,
1072
					       const unsigned char *addr,
1073 1074
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1075
					       struct nlattr *tb[],
1076
					       struct net_device *dev,
1077
					       const unsigned char *addr);
1078 1079 1080 1081
	int			(*ndo_fdb_dump)(struct sk_buff *skb,
						struct netlink_callback *cb,
						struct net_device *dev,
						int idx);
J
John Fastabend 已提交
1082 1083 1084 1085 1086

	int			(*ndo_bridge_setlink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
						      u32 pid, u32 seq,
1087 1088
						      struct net_device *dev,
						      u32 filter_mask);
1089 1090
	int			(*ndo_bridge_dellink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
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Jiri Pirko 已提交
1091 1092
	int			(*ndo_change_carrier)(struct net_device *dev,
						      bool new_carrier);
1093 1094
	int			(*ndo_get_phys_port_id)(struct net_device *dev,
							struct netdev_phys_port_id *ppid);
1095 1096
	void			(*ndo_add_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
J
Joseph Gasparakis 已提交
1097
						      __be16 port);
1098 1099
	void			(*ndo_del_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
J
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1100
						      __be16 port);
1101 1102
};

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Linus Torvalds 已提交
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
/*
 *	The DEVICE structure.
 *	Actually, this whole structure is a big mistake.  It mixes I/O
 *	data with strictly "high-level" data, and it has to know about
 *	almost every data structure used in the INET module.
 *
 *	FIXME: cleanup struct net_device such that network protocol info
 *	moves out.
 */

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Eric Dumazet 已提交
1113
struct net_device {
L
Linus Torvalds 已提交
1114 1115 1116 1117

	/*
	 * 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
1118
	 * of the interface.
L
Linus Torvalds 已提交
1119 1120
	 */
	char			name[IFNAMSIZ];
M
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1121

1122
	/* device name hash chain, please keep it close to name[] */
1123
	struct hlist_node	name_hlist;
1124

1125 1126
	/* snmp alias */
	char 			*ifalias;
L
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1127 1128 1129 1130 1131 1132 1133 1134

	/*
	 *	I/O specific fields
	 *	FIXME: Merge these and struct ifmap into one
	 */
	unsigned long		mem_end;	/* shared mem end	*/
	unsigned long		mem_start;	/* shared mem start	*/
	unsigned long		base_addr;	/* device I/O address	*/
1135
	int			irq;		/* device IRQ number	*/
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1136 1137 1138 1139 1140 1141 1142 1143

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

	unsigned long		state;

1144
	struct list_head	dev_list;
1145
	struct list_head	napi_list;
1146
	struct list_head	unreg_list;
1147
	struct list_head	close_list;
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159

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

	/* all linked devices, *including* neighbours */
	struct {
		struct list_head upper;
		struct list_head lower;
	} all_adj_list;
1160

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Linus Torvalds 已提交
1161

1162
	/* currently active device features */
1163
	netdev_features_t	features;
1164
	/* user-changeable features */
1165
	netdev_features_t	hw_features;
1166
	/* user-requested features */
1167
	netdev_features_t	wanted_features;
1168
	/* mask of features inheritable by VLAN devices */
1169
	netdev_features_t	vlan_features;
1170 1171 1172 1173 1174 1175
	/* mask of features inherited by encapsulating devices
	 * This field indicates what encapsulation offloads
	 * the hardware is capable of doing, and drivers will
	 * need to set them appropriately.
	 */
	netdev_features_t	hw_enc_features;
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1176 1177
	/* mask of fetures inheritable by MPLS */
	netdev_features_t	mpls_features;
1178

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1179 1180 1181 1182
	/* Interface index. Unique device identifier	*/
	int			ifindex;
	int			iflink;

R
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1183
	struct net_device_stats	stats;
1184 1185 1186
	atomic_long_t		rx_dropped; /* dropped packets by core network
					     * Do not use this in drivers.
					     */
L
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1187

1188
#ifdef CONFIG_WIRELESS_EXT
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1189 1190 1191 1192 1193
	/* List of functions to handle Wireless Extensions (instead of ioctl).
	 * See <net/iw_handler.h> for details. Jean II */
	const struct iw_handler_def *	wireless_handlers;
	/* Instance data managed by the core of Wireless Extensions. */
	struct iw_public_data *	wireless_data;
1194
#endif
1195 1196
	/* Management operations */
	const struct net_device_ops *netdev_ops;
1197
	const struct ethtool_ops *ethtool_ops;
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1198

1199 1200 1201
	/* Hardware header description */
	const struct header_ops *header_ops;

S
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1202
	unsigned int		flags;	/* interface flags (a la BSD)	*/
1203 1204
	unsigned int		priv_flags; /* Like 'flags' but invisible to userspace.
					     * See if.h for definitions. */
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1205 1206 1207
	unsigned short		gflags;
	unsigned short		padded;	/* How much padding added by alloc_netdev() */

S
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1208 1209 1210
	unsigned char		operstate; /* RFC2863 operstate */
	unsigned char		link_mode; /* mapping policy to operstate */

1211 1212 1213
	unsigned char		if_port;	/* Selectable AUI, TP,..*/
	unsigned char		dma;		/* DMA channel		*/

1214
	unsigned int		mtu;	/* interface MTU value		*/
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1215 1216 1217
	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

1218 1219 1220 1221 1222 1223 1224
	/* extra head- and tailroom the hardware may need, but not in all cases
	 * can this be guaranteed, especially tailroom. Some cases also use
	 * LL_MAX_HEADER instead to allocate the skb.
	 */
	unsigned short		needed_headroom;
	unsigned short		needed_tailroom;

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1225
	/* Interface address info. */
1226
	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1227
	unsigned char		addr_assign_type; /* hw address assignment type */
L
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1228
	unsigned char		addr_len;	/* hardware address length	*/
1229
	unsigned char		neigh_priv_len;
1230 1231 1232 1233
	unsigned short          dev_id;		/* Used to differentiate devices
						 * that share the same link
						 * layer address
						 */
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1234
	spinlock_t		addr_list_lock;
1235 1236
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
1237 1238 1239 1240 1241 1242 1243
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						    * hw addresses
						    */
#ifdef CONFIG_SYSFS
	struct kset		*queues_kset;
#endif

1244
	bool			uc_promisc;
1245 1246
	unsigned int		promiscuity;
	unsigned int		allmulti;
L
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1247 1248 1249


	/* Protocol specific pointers */
1250

1251
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1252
	struct vlan_info __rcu	*vlan_info;	/* VLAN info */
1253
#endif
1254
#if IS_ENABLED(CONFIG_NET_DSA)
1255
	struct dsa_switch_tree	*dsa_ptr;	/* dsa specific data */
1256
#endif
L
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1257
	void 			*atalk_ptr;	/* AppleTalk link 	*/
E
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1258
	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
1259
	struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
E
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1260
	struct inet6_dev __rcu	*ip6_ptr;       /* IPv6 specific data */
L
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1261
	void			*ax25_ptr;	/* AX.25 specific data */
1262 1263
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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1264

1265
/*
E
Eric Dumazet 已提交
1266
 * Cache lines mostly used on receive path (including eth_type_trans())
1267
 */
1268 1269 1270 1271 1272 1273 1274 1275
	unsigned long		last_rx;	/* Time of last Rx
						 * This should not be set in
						 * drivers, unless really needed,
						 * because network stack (bonding)
						 * use it if/when necessary, to
						 * avoid dirtying this cache line.
						 */

1276
	/* Interface address info used in eth_type_trans() */
1277 1278 1279 1280
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

T
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1281

1282
#ifdef CONFIG_RPS
T
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1283 1284
	struct netdev_rx_queue	*_rx;

1285
	/* Number of RX queues allocated at register_netdev() time */
T
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1286
	unsigned int		num_rx_queues;
1287 1288 1289

	/* Number of RX queues currently active in device */
	unsigned int		real_num_rx_queues;
1290

E
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1291
#endif
T
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1292

1293 1294
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1295

1296
	struct netdev_queue __rcu *ingress_queue;
1297 1298
	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/

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1299 1300 1301 1302

/*
 * Cache lines mostly used on transmit path
 */
1303
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
1304 1305

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
1306
	unsigned int		num_tx_queues;
1307 1308 1309 1310

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

1311 1312 1313
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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1314
	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
1315
	spinlock_t		tx_global_lock;
E
Eric Dumazet 已提交
1316

T
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1317
#ifdef CONFIG_XPS
E
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1318
	struct xps_dev_maps __rcu *xps_maps;
T
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1319
#endif
1320 1321 1322 1323 1324 1325
#ifdef CONFIG_RFS_ACCEL
	/* CPU reverse-mapping for RX completion interrupts, indexed
	 * by RX queue number.  Assigned by driver.  This must only be
	 * set if the ndo_rx_flow_steer operation is defined. */
	struct cpu_rmap		*rx_cpu_rmap;
#endif
T
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1326

1327
	/* These may be needed for future network-power-down code. */
1328 1329 1330 1331 1332

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1333 1334 1335 1336 1337
	unsigned long		trans_start;	/* Time (in jiffies) of last Tx	*/

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

L
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1338
	/* Number of references to this device */
E
Eric Dumazet 已提交
1339
	int __percpu		*pcpu_refcnt;
1340

L
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1341 1342 1343 1344 1345
	/* delayed register/unregister */
	struct list_head	todo_list;
	/* device index hash chain */
	struct hlist_node	index_hlist;

1346
	struct list_head	link_watch_list;
1347

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1348 1349
	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1350
	       NETREG_REGISTERED,	/* completed register_netdevice */
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1351 1352 1353
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1354
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1355 1356 1357
	} reg_state:8;

	bool dismantle; /* device is going do be freed */
1358 1359 1360 1361 1362

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1363

1364 1365
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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1366 1367

#ifdef CONFIG_NETPOLL
1368
	struct netpoll_info __rcu	*npinfo;
L
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1369
#endif
1370

1371
#ifdef CONFIG_NET_NS
1372 1373
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1374
#endif
1375

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David S. Miller 已提交
1376
	/* mid-layer private */
E
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1377 1378 1379
	union {
		void				*ml_priv;
		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
1380
		struct pcpu_tstats __percpu	*tstats; /* tunnel stats */
1381
		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
E
Eric Dumazet 已提交
1382
		struct pcpu_vstats __percpu	*vstats; /* veth stats */
E
Eric Dumazet 已提交
1383
	};
1384
	/* GARP */
E
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1385
	struct garp_port __rcu	*garp_port;
1386 1387
	/* MRP */
	struct mrp_port __rcu	*mrp_port;
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1388 1389

	/* class/net/name entry */
1390
	struct device		dev;
1391 1392
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
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Patrick McHardy 已提交
1393 1394 1395

	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
1396

1397 1398 1399
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1400 1401
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1402

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Jeff Kirsher 已提交
1403
#ifdef CONFIG_DCB
1404
	/* Data Center Bridging netlink ops */
1405
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1406
#endif
1407 1408 1409
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1410

1411
#if IS_ENABLED(CONFIG_FCOE)
1412 1413
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
1414 1415 1416
#endif
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
	struct netprio_map __rcu *priomap;
1417
#endif
1418 1419
	/* phy device may attach itself for hardware timestamping */
	struct phy_device *phydev;
1420

1421 1422
	struct lock_class_key *qdisc_tx_busylock;

1423 1424
	/* group the device belongs to */
	int group;
1425 1426

	struct pm_qos_request	pm_qos_req;
L
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1427
};
1428
#define to_net_dev(d) container_of(d, struct net_device, dev)
L
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1429 1430 1431

#define	NETDEV_ALIGN		32

1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
static inline
int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
{
	return dev->prio_tc_map[prio & TC_BITMASK];
}

static inline
int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
{
	if (tc >= dev->num_tc)
		return -EINVAL;

	dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
	return 0;
}

static inline
void netdev_reset_tc(struct net_device *dev)
{
	dev->num_tc = 0;
	memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
	memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
}

static inline
int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
{
	if (tc >= dev->num_tc)
		return -EINVAL;

	dev->tc_to_txq[tc].count = count;
	dev->tc_to_txq[tc].offset = offset;
	return 0;
}

static inline
int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
{
	if (num_tc > TC_MAX_QUEUE)
		return -EINVAL;

	dev->num_tc = num_tc;
	return 0;
}

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

1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
					 unsigned int index)
{
	return &dev->_tx[index];
}

static inline void netdev_for_each_tx_queue(struct net_device *dev,
					    void (*f)(struct net_device *,
						      struct netdev_queue *,
						      void *),
					    void *arg)
{
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++)
		f(dev, &dev->_tx[i], arg);
}

1502 1503 1504
struct netdev_queue *netdev_pick_tx(struct net_device *dev,
				    struct sk_buff *skb);
u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb);
1505

1506 1507 1508 1509 1510 1511
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
Eric Dumazet 已提交
1512
	return read_pnet(&dev->nd_net);
1513 1514 1515
}

static inline
1516
void dev_net_set(struct net_device *dev, struct net *net)
1517 1518
{
#ifdef CONFIG_NET_NS
1519 1520
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1521 1522 1523
#endif
}

1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
static inline bool netdev_uses_dsa_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_DSA
	if (dev->dsa_ptr != NULL)
		return dsa_uses_dsa_tags(dev->dsa_ptr);
#endif

	return 0;
}

1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
static inline bool netdev_uses_trailer_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_TRAILER
	if (dev->dsa_ptr != NULL)
		return dsa_uses_trailer_tags(dev->dsa_ptr);
#endif

	return 0;
}

1544 1545 1546 1547 1548 1549
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1550
static inline void *netdev_priv(const struct net_device *dev)
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1551
{
1552
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
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1553 1554 1555 1556 1557
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1558
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1559

1560 1561 1562 1563 1564 1565
/* Set the sysfs device type for the network logical device to allow
 * fin grained indentification of different network device types. For
 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

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1566 1567 1568 1569 1570
/* Default NAPI poll() weight
 * Device drivers are strongly advised to not use bigger value
 */
#define NAPI_POLL_WEIGHT 64

1571 1572 1573 1574 1575 1576 1577 1578 1579 1580
/**
 *	netif_napi_add - initialize a napi context
 *	@dev:  network device
 *	@napi: napi context
 *	@poll: polling function
 *	@weight: default weight
 *
 * netif_napi_add() must be used to initialize a napi context prior to calling
 * *any* of the other napi related functions.
 */
1581 1582
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1583

1584 1585 1586 1587 1588 1589
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1590 1591 1592
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1593 1594 1595
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1596 1597 1598
	/* Length of frag0. */
	unsigned int frag0_len;

1599 1600 1601
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1602 1603 1604 1605
	/* This is non-zero if the packet cannot be merged with the new skb. */
	int flush;

	/* Number of segments aggregated. */
1606 1607 1608 1609
	u16	count;

	/* This is non-zero if the packet may be of the same flow. */
	u8	same_flow;
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Herbert Xu 已提交
1610 1611

	/* Free the skb? */
1612
	u8	free;
1613 1614
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2
1615 1616 1617

	/* jiffies when first packet was created/queued */
	unsigned long age;
1618 1619 1620

	/* Used in ipv6_gro_receive() */
	int	proto;
1621 1622 1623

	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
1624 1625 1626
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1627

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1628
struct packet_type {
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1629 1630 1631 1632 1633 1634
	__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 *);
1635 1636
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
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Linus Torvalds 已提交
1637 1638 1639 1640
	void			*af_packet_priv;
	struct list_head	list;
};

1641
struct offload_callbacks {
1642
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
1643
						netdev_features_t features);
1644
	int			(*gso_send_check)(struct sk_buff *skb);
1645 1646 1647
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
1648 1649 1650 1651 1652 1653
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
	struct offload_callbacks callbacks;
	struct list_head	 list;
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1654 1655 1656 1657
};

#include <linux/notifier.h>

1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
/* netdevice notifier chain. Please remember to update the rtnetlink
 * notification exclusion list in rtnetlink_event() when adding new
 * types.
 */
#define NETDEV_UP	0x0001	/* For now you can't veto a device up/down */
#define NETDEV_DOWN	0x0002
#define NETDEV_REBOOT	0x0003	/* Tell a protocol stack a network interface
				   detected a hardware crash and restarted
				   - we can use this eg to kick tcp sessions
				   once done */
#define NETDEV_CHANGE	0x0004	/* Notify device state change */
#define NETDEV_REGISTER 0x0005
#define NETDEV_UNREGISTER	0x0006
#define NETDEV_CHANGEMTU	0x0007
#define NETDEV_CHANGEADDR	0x0008
#define NETDEV_GOING_DOWN	0x0009
#define NETDEV_CHANGENAME	0x000A
#define NETDEV_FEAT_CHANGE	0x000B
#define NETDEV_BONDING_FAILOVER 0x000C
#define NETDEV_PRE_UP		0x000D
#define NETDEV_PRE_TYPE_CHANGE	0x000E
#define NETDEV_POST_TYPE_CHANGE	0x000F
#define NETDEV_POST_INIT	0x0010
1681
#define NETDEV_UNREGISTER_FINAL 0x0011
1682 1683 1684
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014
1685
#define NETDEV_CHANGEUPPER	0x0015
1686
#define NETDEV_RESEND_IGMP	0x0016
1687

1688 1689
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);
1690 1691 1692 1693 1694

struct netdev_notifier_info {
	struct net_device *dev;
};

1695 1696 1697 1698 1699
struct netdev_notifier_change_info {
	struct netdev_notifier_info info; /* must be first */
	unsigned int flags_changed;
};

1700 1701 1702 1703 1704 1705
static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
					     struct net_device *dev)
{
	info->dev = dev;
}

1706 1707 1708 1709 1710 1711
static inline struct net_device *
netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
{
	return info->dev;
}

1712 1713 1714
int call_netdevice_notifiers_info(unsigned long val, struct net_device *dev,
				  struct netdev_notifier_info *info);
int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1715 1716


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1717 1718
extern rwlock_t				dev_base_lock;		/* Device list lock */

1719 1720
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1721 1722
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1723 1724
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1725 1726 1727 1728
#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)
1729 1730
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1731 1732 1733
#define for_each_netdev_in_bond_rcu(bond, slave)	\
		for_each_netdev_rcu(&init_net, slave)	\
			if (netdev_master_upper_dev_get_rcu(slave) == bond)
1734
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1735

1736 1737 1738 1739 1740
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1741
	net = dev_net(dev);
1742 1743 1744 1745
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1746 1747 1748 1749 1750 1751
static inline struct net_device *next_net_device_rcu(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

	net = dev_net(dev);
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Eric Dumazet 已提交
1752
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1753 1754 1755
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1756 1757 1758 1759 1760
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);
}
1761

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1762 1763 1764 1765 1766 1767 1768
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);
}

1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
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);
void __dev_remove_offload(struct packet_offload *po);

struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
					unsigned short mask);
struct net_device *dev_get_by_name(struct net *net, const char *name);
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
struct net_device *__dev_get_by_name(struct net *net, const char *name);
int dev_alloc_name(struct net_device *dev, const char *name);
int dev_open(struct net_device *dev);
int dev_close(struct net_device *dev);
void dev_disable_lro(struct net_device *dev);
int dev_loopback_xmit(struct sk_buff *newskb);
int dev_queue_xmit(struct sk_buff *skb);
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);
1796 1797 1798 1799 1800
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

1801 1802
int netdev_refcnt_read(const struct net_device *dev);
void free_netdev(struct net_device *dev);
1803
void netdev_freemem(struct net_device *dev);
1804 1805
void synchronize_net(void);
int init_dummy_netdev(struct net_device *dev);
1806

1807 1808 1809 1810 1811
struct net_device *dev_get_by_index(struct net *net, int ifindex);
struct net_device *__dev_get_by_index(struct net *net, int ifindex);
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
int netdev_get_name(struct net *net, char *name, int ifindex);
int dev_restart(struct net_device *dev);
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#ifdef CONFIG_NETPOLL_TRAP
1813
int netpoll_trap(void);
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1814
#endif
1815
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831

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;
}

1832 1833
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1834
{
1835 1836
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1837

1838 1839 1840 1841
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1842

1843 1844 1845
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
1846 1847 1848
	if (!pskb_may_pull(skb, hlen))
		return NULL;

1849 1850
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
1851
	return skb->data + offset;
1852
}
L
Linus Torvalds 已提交
1853

1854 1855
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1856
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1857 1858
}

H
Herbert Xu 已提交
1859 1860
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1861 1862
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
1863 1864
}

1865 1866
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1867
				  const void *daddr, const void *saddr,
1868
				  unsigned int len)
1869
{
1870
	if (!dev->header_ops || !dev->header_ops->create)
1871
		return 0;
1872 1873

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1874 1875
}

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Stephen Hemminger 已提交
1876 1877 1878 1879 1880
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1881
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
1882
		return 0;
1883
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
1884 1885
}

L
Linus Torvalds 已提交
1886
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
1887
int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
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1888 1889 1890 1891 1892
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

1893
#ifdef CONFIG_NET_FLOW_LIMIT
1894
#define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
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 */

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Linus Torvalds 已提交
1906
/*
E
Eric Dumazet 已提交
1907
 * Incoming packets are placed on per-cpu queues
L
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1908
 */
E
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1909
struct softnet_data {
1910
	struct Qdisc		*output_queue;
1911
	struct Qdisc		**output_queue_tailp;
L
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1912 1913
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
1914
	struct sk_buff_head	process_queue;
L
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1915

C
Changli Gao 已提交
1916
	/* stats */
1917 1918 1919 1920
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
C
Changli Gao 已提交
1921

1922
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
1923 1924 1925
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
T
Tom Herbert 已提交
1926
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
1927 1928
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
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1929
	unsigned int		input_queue_head;
1930
	unsigned int		input_queue_tail;
1931
#endif
1932
	unsigned int		dropped;
T
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1933
	struct sk_buff_head	input_pkt_queue;
1934
	struct napi_struct	backlog;
1935 1936

#ifdef CONFIG_NET_FLOW_LIMIT
1937
	struct sd_flow_limit __rcu *flow_limit;
1938
#endif
L
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1939 1940
};

1941
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
1942 1943
{
#ifdef CONFIG_RPS
1944 1945 1946 1947 1948 1949 1950 1951 1952
	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
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1953 1954 1955
#endif
}

T
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1956
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
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1957

1958
void __netif_schedule(struct Qdisc *q);
L
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1959

1960
static inline void netif_schedule_queue(struct netdev_queue *txq)
L
Linus Torvalds 已提交
1961
{
1962
	if (!(txq->state & QUEUE_STATE_ANY_XOFF))
1963
		__netif_schedule(txq->qdisc);
1964 1965
}

1966 1967 1968 1969 1970 1971 1972 1973
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));
}

1974 1975
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
1976
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
1977 1978
}

1979 1980 1981 1982 1983 1984
/**
 *	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
1985 1986
static inline void netif_start_queue(struct net_device *dev)
{
1987
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1988 1989
}

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

2000
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
L
Linus Torvalds 已提交
2001 2002
{
#ifdef CONFIG_NETPOLL_TRAP
2003
	if (netpoll_trap()) {
2004
		netif_tx_start_queue(dev_queue);
L
Linus Torvalds 已提交
2005
		return;
2006
	}
L
Linus Torvalds 已提交
2007
#endif
2008
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
2009
		__netif_schedule(dev_queue->qdisc);
2010 2011
}

2012 2013 2014 2015 2016 2017 2018
/**
 *	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.
 */
2019 2020
static inline void netif_wake_queue(struct net_device *dev)
{
2021
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2022 2023
}

2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
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);
	}
}

2034 2035
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
2036
	if (WARN_ON(!dev_queue)) {
2037
		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
2038 2039
		return;
	}
2040
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2041 2042
}

2043 2044 2045 2046 2047 2048 2049
/**
 *	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
2050 2051
static inline void netif_stop_queue(struct net_device *dev)
{
2052
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2053 2054
}

2055 2056 2057 2058 2059 2060 2061 2062 2063 2064
static inline void netif_tx_stop_all_queues(struct net_device *dev)
{
	unsigned int i;

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

2065
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2066
{
2067
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2068 2069
}

2070 2071 2072 2073 2074 2075
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
2076
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
2077
{
2078
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2079 2080
}

2081
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2082
{
2083 2084 2085
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

2086
static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2087 2088 2089 2090
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

2091 2092 2093
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
2094 2095
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111

	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
2112
#endif
2113 2114
}

2115 2116 2117 2118 2119 2120 2121 2122 2123
/**
 * 	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
 */
2124 2125 2126 2127 2128 2129
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,
2130
					     unsigned int pkts, unsigned int bytes)
2131
{
T
Tom Herbert 已提交
2132
#ifdef CONFIG_BQL
2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
	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);
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2150
#endif
2151 2152
}

2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
/**
 * 	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()
 */
2163
static inline void netdev_completed_queue(struct net_device *dev,
2164
					  unsigned int pkts, unsigned int bytes)
2165 2166 2167 2168 2169 2170
{
	netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
}

static inline void netdev_tx_reset_queue(struct netdev_queue *q)
{
T
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2171
#ifdef CONFIG_BQL
2172
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
2173 2174
	dql_reset(&q->dql);
#endif
2175 2176
}

2177 2178 2179 2180 2181 2182 2183
/**
 * 	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
 */
2184 2185 2186
static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2187 2188
}

2189 2190 2191 2192 2193 2194
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
2195
static inline bool netif_running(const struct net_device *dev)
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2196 2197 2198 2199
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

2200 2201 2202 2203 2204 2205
/*
 * Routines to manage the subqueues on a device.  We only need start
 * stop, and a check if it's stopped.  All other device management is
 * done at the overall netdevice level.
 * Also test the device if we're multiqueue.
 */
2206 2207 2208 2209 2210 2211 2212 2213

/**
 *	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.
 */
2214 2215
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
2216
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2217 2218

	netif_tx_start_queue(txq);
2219 2220
}

2221 2222 2223 2224 2225 2226 2227
/**
 *	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.
 */
2228 2229
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
2230
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2231 2232 2233 2234
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2235
	netif_tx_stop_queue(txq);
2236 2237
}

2238 2239 2240 2241 2242 2243 2244
/**
 *	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.
 */
2245 2246
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
2247
{
2248
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2249 2250

	return netif_tx_queue_stopped(txq);
2251 2252
}

2253 2254
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
2255 2256 2257
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
2258 2259 2260 2261 2262 2263 2264 2265

/**
 *	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.
 */
2266 2267
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
2268
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2269 2270 2271 2272
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
2273
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
2274
		__netif_schedule(txq->qdisc);
2275 2276
}

2277
#ifdef CONFIG_XPS
2278
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2279
			u16 index);
2280 2281
#else
static inline int netif_set_xps_queue(struct net_device *dev,
2282
				      const struct cpumask *mask,
2283 2284 2285 2286 2287 2288
				      u16 index)
{
	return 0;
}
#endif

2289 2290 2291 2292 2293 2294 2295 2296 2297 2298
/*
 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
 * as a distribution range limit for the returned value.
 */
static inline u16 skb_tx_hash(const struct net_device *dev,
			      const struct sk_buff *skb)
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

2299 2300 2301 2302 2303 2304
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
2305
static inline bool netif_is_multiqueue(const struct net_device *dev)
2306
{
E
Eric Dumazet 已提交
2307
	return dev->num_tx_queues > 1;
2308
}
L
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2309

2310
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
2311

2312
#ifdef CONFIG_RPS
2313
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
2314 2315 2316 2317 2318 2319 2320 2321
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

2322 2323 2324
static inline int netif_copy_real_num_queues(struct net_device *to_dev,
					     const struct net_device *from_dev)
{
2325 2326 2327 2328 2329 2330
	int err;

	err = netif_set_real_num_tx_queues(to_dev,
					   from_dev->real_num_tx_queues);
	if (err)
		return err;
2331 2332 2333 2334 2335 2336 2337 2338
#ifdef CONFIG_RPS
	return netif_set_real_num_rx_queues(to_dev,
					    from_dev->real_num_rx_queues);
#else
	return 0;
#endif
}

2339
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
2340
int netif_get_num_default_rss_queues(void);
2341

L
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2342
/* Use this variant when it is known for sure that it
2343 2344
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
L
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2345
 */
2346
void dev_kfree_skb_irq(struct sk_buff *skb);
L
Linus Torvalds 已提交
2347 2348

/* Use this variant in places where it could be invoked
2349 2350
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
L
Linus Torvalds 已提交
2351
 */
2352
void dev_kfree_skb_any(struct sk_buff *skb);
L
Linus Torvalds 已提交
2353

2354 2355 2356 2357 2358 2359 2360
int netif_rx(struct sk_buff *skb);
int netif_rx_ni(struct sk_buff *skb);
int netif_receive_skb(struct sk_buff *skb);
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
void napi_gro_flush(struct napi_struct *napi, bool flush_old);
struct sk_buff *napi_get_frags(struct napi_struct *napi);
gro_result_t napi_gro_frags(struct napi_struct *napi);
2361 2362 2363 2364 2365 2366 2367

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

2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378
int netdev_rx_handler_register(struct net_device *dev,
			       rx_handler_func_t *rx_handler,
			       void *rx_handler_data);
void netdev_rx_handler_unregister(struct net_device *dev);

bool dev_valid_name(const char *name);
int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
int dev_ethtool(struct net *net, struct ifreq *);
unsigned int dev_get_flags(const struct net_device *);
int __dev_change_flags(struct net_device *, unsigned int flags);
int dev_change_flags(struct net_device *, unsigned int);
2379 2380
void __dev_notify_flags(struct net_device *, unsigned int old_flags,
			unsigned int gchanges);
2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392
int dev_change_name(struct net_device *, const char *);
int dev_set_alias(struct net_device *, const char *, size_t);
int dev_change_net_namespace(struct net_device *, struct net *, const char *);
int dev_set_mtu(struct net_device *, int);
void dev_set_group(struct net_device *, int);
int dev_set_mac_address(struct net_device *, struct sockaddr *);
int dev_change_carrier(struct net_device *, bool new_carrier);
int dev_get_phys_port_id(struct net_device *dev,
			 struct netdev_phys_port_id *ppid);
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq);
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
L
Linus Torvalds 已提交
2393

2394
extern int		netdev_budget;
L
Linus Torvalds 已提交
2395 2396

/* Called by rtnetlink.c:rtnl_unlock() */
2397
void netdev_run_todo(void);
L
Linus Torvalds 已提交
2398

2399 2400 2401 2402
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
2403
 * Release reference to device to allow it to be freed.
2404
 */
L
Linus Torvalds 已提交
2405 2406
static inline void dev_put(struct net_device *dev)
{
2407
	this_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
2408 2409
}

2410 2411 2412 2413
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
2414
 * Hold reference to device to keep it from being freed.
2415
 */
2416 2417
static inline void dev_hold(struct net_device *dev)
{
2418
	this_cpu_inc(*dev->pcpu_refcnt);
2419
}
L
Linus Torvalds 已提交
2420 2421 2422 2423

/* 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
2424 2425 2426 2427
 *
 * 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
2428 2429
 */

2430 2431 2432
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
2433

2434 2435 2436 2437 2438 2439
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2440
static inline bool netif_carrier_ok(const struct net_device *dev)
L
Linus Torvalds 已提交
2441 2442 2443 2444
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

2445
unsigned long dev_trans_start(struct net_device *dev);
2446

2447
void __netdev_watchdog_up(struct net_device *dev);
L
Linus Torvalds 已提交
2448

2449
void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
2450

2451
void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
2452

2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
/**
 *	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
2466 2467 2468 2469 2470 2471
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2472 2473 2474 2475 2476 2477
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
2478 2479 2480 2481 2482 2483
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2484 2485 2486 2487 2488 2489
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2490
static inline bool netif_dormant(const struct net_device *dev)
S
Stefan Rompf 已提交
2491 2492 2493 2494 2495
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2496 2497 2498 2499 2500 2501
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
2502
static inline bool netif_oper_up(const struct net_device *dev)
E
Eric Dumazet 已提交
2503
{
S
Stefan Rompf 已提交
2504 2505 2506 2507
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

2508 2509 2510 2511 2512 2513
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
2514
static inline bool netif_device_present(struct net_device *dev)
L
Linus Torvalds 已提交
2515 2516 2517 2518
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

2519
void netif_device_detach(struct net_device *dev);
L
Linus Torvalds 已提交
2520

2521
void netif_device_attach(struct net_device *dev);
L
Linus Torvalds 已提交
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571

/*
 * 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;
}

2572
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
2573
{
2574 2575
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
2576 2577
}

2578 2579 2580 2581 2582 2583
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

2584
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
2585
{
2586
	bool ok = spin_trylock(&txq->_xmit_lock);
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603
	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
2604 2605 2606 2607 2608 2609
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

2610 2611 2612 2613 2614 2615
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
2616 2617
static inline void netif_tx_lock(struct net_device *dev)
{
2618
	unsigned int i;
2619
	int cpu;
2620

2621 2622
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
2623 2624
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2625 2626 2627 2628 2629 2630 2631

		/* 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.
		 */
2632
		__netif_tx_lock(txq, cpu);
2633 2634
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
2635
	}
H
Herbert Xu 已提交
2636 2637 2638 2639
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
2640 2641
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
2642 2643 2644 2645
}

static inline void netif_tx_unlock(struct net_device *dev)
{
2646 2647 2648 2649
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2650

2651 2652 2653 2654 2655
		/* 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);
2656
		netif_schedule_queue(txq);
2657 2658
	}
	spin_unlock(&dev->tx_global_lock);
H
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2659 2660 2661 2662
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2663 2664
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
2665 2666
}

2667
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2668
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2669
		__netif_tx_lock(txq, cpu);		\
2670 2671 2672
	}						\
}

2673
#define HARD_TX_UNLOCK(dev, txq) {			\
2674
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2675
		__netif_tx_unlock(txq);			\
2676 2677 2678
	}						\
}

L
Linus Torvalds 已提交
2679 2680
static inline void netif_tx_disable(struct net_device *dev)
{
2681
	unsigned int i;
2682
	int cpu;
2683

2684 2685
	local_bh_disable();
	cpu = smp_processor_id();
2686 2687
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2688 2689

		__netif_tx_lock(txq, cpu);
2690
		netif_tx_stop_queue(txq);
2691
		__netif_tx_unlock(txq);
2692
	}
2693
	local_bh_enable();
L
Linus Torvalds 已提交
2694 2695
}

2696 2697 2698 2699 2700
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

2701 2702 2703 2704 2705
static inline void netif_addr_lock_nested(struct net_device *dev)
{
	spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
}

2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720
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);
}

2721
/*
2722
 * dev_addrs walker. Should be used only for read access. Call with
2723 2724 2725
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2726
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2727

L
Linus Torvalds 已提交
2728 2729
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

2730
void ether_setup(struct net_device *dev);
L
Linus Torvalds 已提交
2731 2732

/* Support for loadable net-drivers */
2733 2734 2735
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
				    void (*setup)(struct net_device *),
				    unsigned int txqs, unsigned int rxqs);
2736
#define alloc_netdev(sizeof_priv, name, setup) \
T
Tom Herbert 已提交
2737 2738 2739 2740 2741
	alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)

#define alloc_netdev_mq(sizeof_priv, name, setup, count) \
	alloc_netdev_mqs(sizeof_priv, name, setup, count, count)

2742 2743
int register_netdev(struct net_device *dev);
void unregister_netdev(struct net_device *dev);
2744

2745
/* General hardware address lists handling functions */
2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757
int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
			   struct netdev_hw_addr_list *from_list,
			   int addr_len, unsigned char addr_type);
void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
			    struct netdev_hw_addr_list *from_list,
			    int addr_len, unsigned char addr_type);
int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
		   struct netdev_hw_addr_list *from_list, int addr_len);
void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
		      struct netdev_hw_addr_list *from_list, int addr_len);
void __hw_addr_flush(struct netdev_hw_addr_list *list);
void __hw_addr_init(struct netdev_hw_addr_list *list);
2758

2759
/* Functions used for device addresses handling */
2760 2761 2762 2763 2764 2765 2766 2767 2768 2769
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);
int dev_addr_add_multiple(struct net_device *to_dev,
			  struct net_device *from_dev, unsigned char addr_type);
int dev_addr_del_multiple(struct net_device *to_dev,
			  struct net_device *from_dev, unsigned char addr_type);
void dev_addr_flush(struct net_device *dev);
int dev_addr_init(struct net_device *dev);
2770 2771

/* Functions used for unicast addresses handling */
2772 2773 2774 2775 2776 2777 2778 2779
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);
2780

2781
/* Functions used for multicast addresses handling */
2782 2783 2784 2785 2786 2787 2788 2789 2790 2791
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);
2792

2793
/* Functions used for secondary unicast and multicast support */
2794 2795 2796 2797 2798 2799 2800
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
2801
/* Load a device via the kmod */
2802 2803 2804 2805 2806
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);
2807

L
Linus Torvalds 已提交
2808
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
2809
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
2810
extern int		weight_p;
2811
extern int		bpf_jit_enable;
J
Jiri Pirko 已提交
2812

2813 2814 2815 2816
bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
bool netdev_has_any_upper_dev(struct net_device *dev);
struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
2817 2818

/* iterate through upper list, must be called under RCU read lock */
2819 2820 2821 2822 2823
#define netdev_for_each_all_upper_dev_rcu(dev, updev, iter) \
	for (iter = &(dev)->all_adj_list.upper, \
	     updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)); \
	     updev; \
	     updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)))
2824

2825 2826 2827 2828
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);
2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841

#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)))

2842 2843 2844 2845 2846
void *netdev_adjacent_get_private(struct list_head *adj_list);
struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev);
int netdev_master_upper_dev_link(struct net_device *dev,
J
Jiri Pirko 已提交
2847
				 struct net_device *upper_dev);
2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861
int netdev_master_upper_dev_link_private(struct net_device *dev,
					 struct net_device *upper_dev,
					 void *private);
void netdev_upper_dev_unlink(struct net_device *dev,
			     struct net_device *upper_dev);
void *netdev_lower_dev_get_private_rcu(struct net_device *dev,
				       struct net_device *lower_dev);
void *netdev_lower_dev_get_private(struct net_device *dev,
				   struct net_device *lower_dev);
int skb_checksum_help(struct sk_buff *skb);
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
				  netdev_features_t features, bool tx_path);
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
				    netdev_features_t features);
2862 2863 2864 2865 2866 2867

static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
	return __skb_gso_segment(skb, features, true);
}
2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880
__be16 skb_network_protocol(struct sk_buff *skb);

static inline bool can_checksum_protocol(netdev_features_t features,
					 __be16 protocol)
{
	return ((features & NETIF_F_GEN_CSUM) ||
		((features & NETIF_F_V4_CSUM) &&
		 protocol == htons(ETH_P_IP)) ||
		((features & NETIF_F_V6_CSUM) &&
		 protocol == htons(ETH_P_IPV6)) ||
		((features & NETIF_F_FCOE_CRC) &&
		 protocol == htons(ETH_P_FCOE)));
}
2881

2882
#ifdef CONFIG_BUG
2883
void netdev_rx_csum_fault(struct net_device *dev);
2884 2885 2886 2887 2888
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
L
Linus Torvalds 已提交
2889
/* rx skb timestamps */
2890 2891
void net_enable_timestamp(void);
void net_disable_timestamp(void);
L
Linus Torvalds 已提交
2892

2893
#ifdef CONFIG_PROC_FS
2894
int __init dev_proc_init(void);
2895 2896
#else
#define dev_proc_init() 0
2897 2898
#endif

2899 2900
int netdev_class_create_file(struct class_attribute *class_attr);
void netdev_class_remove_file(struct class_attribute *class_attr);
2901

2902 2903
extern struct kobj_ns_type_operations net_ns_type_operations;

2904
const char *netdev_drivername(const struct net_device *dev);
2905

2906
void linkwatch_run_queue(void);
2907

2908 2909
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
2910 2911 2912
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
2913 2914
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925

/* 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);
}

2926
int __netdev_update_features(struct net_device *dev);
2927
void netdev_update_features(struct net_device *dev);
2928
void netdev_change_features(struct net_device *dev);
2929

2930 2931 2932
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

2933
netdev_features_t netif_skb_features(struct sk_buff *skb);
2934

2935
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
2936
{
2937
	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
2938 2939 2940 2941 2942 2943 2944 2945 2946

	/* check flags correspondence */
	BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));

2947
	return (features & feature) == feature;
2948 2949
}

2950
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
2951
{
H
Herbert Xu 已提交
2952
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2953
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2954 2955
}

2956 2957
static inline bool netif_needs_gso(struct sk_buff *skb,
				   netdev_features_t features)
2958
{
2959
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
2960 2961
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
2962 2963
}

2964 2965 2966 2967 2968 2969
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

2970 2971 2972 2973 2974
static inline bool netif_is_bond_master(struct net_device *dev)
{
	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
}

2975
static inline bool netif_is_bond_slave(struct net_device *dev)
J
Jiri Pirko 已提交
2976 2977 2978 2979
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

2980 2981 2982 2983 2984
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

2985
extern struct pernet_operations __net_initdata loopback_net_ops;
2986

2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997
/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

static inline const char *netdev_name(const struct net_device *dev)
{
	if (dev->reg_state != NETREG_REGISTERED)
		return "(unregistered net_device)";
	return dev->name;
}

2998
__printf(3, 4)
2999 3000
int netdev_printk(const char *level, const struct net_device *dev,
		  const char *format, ...);
3001
__printf(2, 3)
3002
int netdev_emerg(const struct net_device *dev, const char *format, ...);
3003
__printf(2, 3)
3004
int netdev_alert(const struct net_device *dev, const char *format, ...);
3005
__printf(2, 3)
3006
int netdev_crit(const struct net_device *dev, const char *format, ...);
3007
__printf(2, 3)
3008
int netdev_err(const struct net_device *dev, const char *format, ...);
3009
__printf(2, 3)
3010
int netdev_warn(const struct net_device *dev, const char *format, ...);
3011
__printf(2, 3)
3012
int netdev_notice(const struct net_device *dev, const char *format, ...);
3013
__printf(2, 3)
3014
int netdev_info(const struct net_device *dev, const char *format, ...);
3015

3016 3017 3018
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

3019
#if defined(CONFIG_DYNAMIC_DEBUG)
3020 3021
#define netdev_dbg(__dev, format, args...)			\
do {								\
3022
	dynamic_netdev_dbg(__dev, format, ##args);		\
3023
} while (0)
3024 3025 3026
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053
#else
#define netdev_dbg(__dev, format, args...)			\
({								\
	if (0)							\
		netdev_printk(KERN_DEBUG, __dev, format, ##args); \
	0;							\
})
#endif

#if defined(VERBOSE_DEBUG)
#define netdev_vdbg	netdev_dbg
#else

#define netdev_vdbg(dev, format, args...)			\
({								\
	if (0)							\
		netdev_printk(KERN_DEBUG, dev, format, ##args);	\
	0;							\
})
#endif

/*
 * netdev_WARN() acts like dev_printk(), but with the key difference
 * of using a WARN/WARN_ON to get the message out, including the
 * file/line information and a backtrace.
 */
#define netdev_WARN(dev, format, args...)			\
3054
	WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args)
3055

3056 3057 3058 3059 3060 3061 3062 3063
/* 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)

3064 3065 3066 3067 3068 3069
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

3070
#define netif_emerg(priv, type, dev, fmt, args...)		\
3071
	netif_level(emerg, priv, type, dev, fmt, ##args)
3072
#define netif_alert(priv, type, dev, fmt, args...)		\
3073
	netif_level(alert, priv, type, dev, fmt, ##args)
3074
#define netif_crit(priv, type, dev, fmt, args...)		\
3075
	netif_level(crit, priv, type, dev, fmt, ##args)
3076
#define netif_err(priv, type, dev, fmt, args...)		\
3077
	netif_level(err, priv, type, dev, fmt, ##args)
3078
#define netif_warn(priv, type, dev, fmt, args...)		\
3079
	netif_level(warn, priv, type, dev, fmt, ##args)
3080
#define netif_notice(priv, type, dev, fmt, args...)		\
3081
	netif_level(notice, priv, type, dev, fmt, ##args)
3082
#define netif_info(priv, type, dev, fmt, args...)		\
3083
	netif_level(info, priv, type, dev, fmt, ##args)
3084

3085
#if defined(CONFIG_DYNAMIC_DEBUG)
3086 3087 3088
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
3089
		dynamic_netdev_dbg(netdev, format, ##args);	\
3090
} while (0)
3091 3092 3093
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
3094 3095 3096 3097 3098 3099 3100 3101 3102 3103
#else
#define netif_dbg(priv, type, dev, format, args...)			\
({									\
	if (0)								\
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
	0;								\
})
#endif

#if defined(VERBOSE_DEBUG)
3104
#define netif_vdbg	netif_dbg
3105 3106 3107 3108
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
3109
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
3110 3111 3112
	0;							\
})
#endif
3113

3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143
/*
 *	The list of packet types we will receive (as opposed to discard)
 *	and the routines to invoke.
 *
 *	Why 16. Because with 16 the only overlap we get on a hash of the
 *	low nibble of the protocol value is RARP/SNAP/X.25.
 *
 *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
 *             sure which should go first, but I bet it won't make much
 *             difference if we are running VLANs.  The good news is that
 *             this protocol won't be in the list unless compiled in, so
 *             the average user (w/out VLANs) will not be adversely affected.
 *             --BLG
 *
 *		0800	IP
 *		8100    802.1Q VLAN
 *		0001	802.3
 *		0002	AX.25
 *		0004	802.2
 *		8035	RARP
 *		0005	SNAP
 *		0805	X.25
 *		0806	ARP
 *		8137	IPX
 *		0009	Localtalk
 *		86DD	IPv6
 */
#define PTYPE_HASH_SIZE	(16)
#define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)

3144
#endif	/* _LINUX_NETDEVICE_H */