netdevice.h 114.6 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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void netdev_set_default_ethtool_ops(struct net_device *dev,
				    const struct ethtool_ops *ops);
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/* Backlog congestion levels */
#define NET_RX_SUCCESS		0	/* keep 'em coming, baby */
#define NET_RX_DROP		1	/* packet dropped */

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

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

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

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

	return false;
}

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

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

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


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

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

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struct neighbour;
struct neigh_parms;
struct sk_buff;

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

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

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

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

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

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


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

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

	unsigned long		state;
	int			weight;
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	unsigned int		gro_count;
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	int			(*poll)(struct napi_struct *, int);
#ifdef CONFIG_NETPOLL
	spinlock_t		poll_lock;
	int			poll_owner;
#endif
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	struct net_device	*dev;
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	struct sk_buff		*gro_list;
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	struct sk_buff		*skb;
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	struct 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));
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	smp_mb__before_atomic();
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	clear_bit(NAPI_STATE_SCHED, &n->state);
}

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

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

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

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/*
 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
 * netif_tx_* functions below are used to manipulate this flag.  The
 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
 * queue independently.  The netif_xmit_*stopped functions below are called
 * to check if the queue has been stopped by the driver or stack (either
 * of the XOFF bits are set in the state).  Drivers should not need to call
 * netif_xmit*stopped functions, they should only be using netif_tx_*.
 */
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struct netdev_queue {
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/*
 * read mostly part
 */
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	struct net_device	*dev;
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	struct Qdisc __rcu	*qdisc;
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	struct Qdisc		*qdisc_sleeping;
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#ifdef CONFIG_SYSFS
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	struct kobject		kobj;
#endif
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#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	int			numa_node;
#endif
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/*
 * write mostly part
 */
	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
	int			xmit_lock_owner;
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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
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	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;
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	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) + \
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    ((_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) + \
637
    ((_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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#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);
667
#endif
668
#endif /* CONFIG_RPS */
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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
672
#ifdef CONFIG_RPS
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	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
675
#endif
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	struct kobject			kobj;
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	struct net_device		*dev;
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} ____cacheline_aligned_in_smp;
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/*
 * RX queue sysfs structures and functions.
 */
struct rx_queue_attribute {
	struct attribute attr;
	ssize_t (*show)(struct netdev_rx_queue *queue,
	    struct rx_queue_attribute *attr, char *buf);
	ssize_t (*store)(struct netdev_rx_queue *queue,
	    struct rx_queue_attribute *attr, const char *buf, size_t len);
};
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#ifdef CONFIG_XPS
/*
 * This structure holds an XPS map which can be of variable length.  The
 * map is an array of queues.
 */
struct xps_map {
	unsigned int len;
	unsigned int alloc_len;
	struct rcu_head rcu;
	u16 queues[0];
};
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#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
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#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))	\
    / sizeof(u16))

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

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

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

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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;
};

752 753 754
typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
				       struct sk_buff *skb);

755 756
/*
 * This structure defines the management hooks for network devices.
757 758
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
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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);
780
 *	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)
783 784
 *	Required can not be NULL.
 *
785
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
786
 *                         void *accel_priv, select_queue_fallback_t fallback);
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 *	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
801
 *	needs to be changed. If this interface is not defined, the
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
 *	mac address can not be changed.
 *
 * int (*ndo_validate_addr)(struct net_device *dev);
 *	Test if Media Access Control address is valid for the device.
 *
 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 *	Called when a user request an ioctl which can't be handled by
 *	the generic interface code. If not defined ioctl's return
 *	not supported error code.
 *
 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 *	Used to set network devices bus interface parameters. This interface
 *	is retained for legacy reason, new devices should use the bus
 *	interface (PCI) for low level management.
 *
 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 *	Called when a user wants to change the Maximum Transfer Unit
 *	of a device. If not defined, any request to change MTU will
 *	will return an error.
 *
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 * void (*ndo_tx_timeout)(struct net_device *dev);
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 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
826
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
827
 *                      struct rtnl_link_stats64 *storage);
828
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
829
 *	Called when a user wants to get the network device usage
830
 *	statistics. Drivers must do one of the following:
831 832
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
833
 *	2. Define @ndo_get_stats to update a net_device_stats structure
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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.
839
 *
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 * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16t vid);
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is registered.
843
 *
844
 * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
845 846
 *	If device support VLAN filtering this function is called when a
 *	VLAN id is unregistered.
847 848
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
849 850 851 852
 *
 *	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);
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 * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
 *			  int max_tx_rate);
855
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
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 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
858
 * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
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 * 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);
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 * 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.
867
 *
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
 *	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.
 *
898 899 900 901 902 903 904
 * 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.
 *
905 906 907 908 909 910
 * 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.
 *
911 912 913 914 915 916
 *	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.
917
 *
918
 *	Slave management functions (for bridge, bonding, etc).
919 920 921 922 923
 * 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.
924 925
 *
 *      Feature/offload setting functions.
926 927
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *		netdev_features_t features);
928 929 930 931
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
932
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
933 934 935 936
 *	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.
 *
937 938
 * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
939
 *		      const unsigned char *addr, u16 flags)
940
 *	Adds an FDB entry to dev for addr.
941 942
 * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
 *		      struct net_device *dev,
943
 *		      const unsigned char *addr)
944 945
 *	Deletes the FDB entry from dev coresponding to addr.
 * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
946 947
 *		       struct net_device *dev, struct net_device *filter_dev,
 *		       int idx)
948 949
 *	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,
953
 *			     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.
962 963 964 965 966 967
 *
 * 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.
968 969
 *
 * void (*ndo_add_vxlan_port)(struct  net_device *dev,
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 *			      sa_family_t sa_family, __be16 port);
971 972 973 974 975 976
 *	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);
978 979 980
 *	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.
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999
 *
 * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
 *				 struct net_device *dev)
 *	Called by upper layer devices to accelerate switching or other
 *	station functionality into hardware. 'pdev is the lowerdev
 *	to use for the offload and 'dev' is the net device that will
 *	back the offload. Returns a pointer to the private structure
 *	the upper layer will maintain.
 * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv)
 *	Called by upper layer device to delete the station created
 *	by 'ndo_dfwd_add_station'. 'pdev' is the net device backing
 *	the station and priv is the structure returned by the add
 *	operation.
 * netdev_tx_t (*ndo_dfwd_start_xmit)(struct sk_buff *skb,
 *				      struct net_device *dev,
 *				      void *priv);
 *	Callback to use for xmit over the accelerated station. This
 *	is used in place of ndo_start_xmit on accelerated net
 *	devices.
1000 1001 1002 1003 1004 1005
 */
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);
1006
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
1007 1008
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
1009
						    struct sk_buff *skb,
1010 1011
						    void *accel_priv,
						    select_queue_fallback_t fallback);
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
	void			(*ndo_change_rx_flags)(struct net_device *dev,
						       int flags);
	void			(*ndo_set_rx_mode)(struct net_device *dev);
	int			(*ndo_set_mac_address)(struct net_device *dev,
						       void *addr);
	int			(*ndo_validate_addr)(struct net_device *dev);
	int			(*ndo_do_ioctl)(struct net_device *dev,
					        struct ifreq *ifr, int cmd);
	int			(*ndo_set_config)(struct net_device *dev,
					          struct ifmap *map);
1022 1023 1024 1025
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
1026 1027
	void			(*ndo_tx_timeout) (struct net_device *dev);

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

1032
	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
1033
						       __be16 proto, u16 vid);
1034
	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
1035
						        __be16 proto, u16 vid);
1036 1037
#ifdef CONFIG_NET_POLL_CONTROLLER
	void                    (*ndo_poll_controller)(struct net_device *dev);
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	int			(*ndo_netpoll_setup)(struct net_device *dev,
1039
						     struct netpoll_info *info);
1040
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
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#endif
1042
#ifdef CONFIG_NET_RX_BUSY_POLL
1043
	int			(*ndo_busy_poll)(struct napi_struct *dev);
1044
#endif
1045 1046 1047 1048
	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);
1049 1050 1051
	int			(*ndo_set_vf_rate)(struct net_device *dev,
						   int vf, int min_tx_rate,
						   int max_tx_rate);
1052 1053
	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
						       int vf, bool setting);
1054 1055 1056
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
1057 1058
	int			(*ndo_set_vf_link_state)(struct net_device *dev,
							 int vf, int link_state);
1059 1060 1061 1062 1063
	int			(*ndo_set_vf_port)(struct net_device *dev,
						   int vf,
						   struct nlattr *port[]);
	int			(*ndo_get_vf_port)(struct net_device *dev,
						   int vf, struct sk_buff *skb);
1064
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
1065
#if IS_ENABLED(CONFIG_FCOE)
1066 1067
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
1068 1069 1070 1071 1072 1073
	int			(*ndo_fcoe_ddp_setup)(struct net_device *dev,
						      u16 xid,
						      struct scatterlist *sgl,
						      unsigned int sgc);
	int			(*ndo_fcoe_ddp_done)(struct net_device *dev,
						     u16 xid);
1074 1075 1076 1077
	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
1078 1079
	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
							struct netdev_fcoe_hbainfo *hbainfo);
1080 1081
#endif

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

1089 1090 1091 1092 1093 1094
#ifdef CONFIG_RFS_ACCEL
	int			(*ndo_rx_flow_steer)(struct net_device *dev,
						     const struct sk_buff *skb,
						     u16 rxq_index,
						     u32 flow_id);
#endif
1095 1096 1097 1098
	int			(*ndo_add_slave)(struct net_device *dev,
						 struct net_device *slave_dev);
	int			(*ndo_del_slave)(struct net_device *dev,
						 struct net_device *slave_dev);
1099 1100
	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
						    netdev_features_t features);
1101
	int			(*ndo_set_features)(struct net_device *dev,
1102
						    netdev_features_t features);
1103
	int			(*ndo_neigh_construct)(struct neighbour *n);
1104
	void			(*ndo_neigh_destroy)(struct neighbour *n);
1105 1106

	int			(*ndo_fdb_add)(struct ndmsg *ndm,
1107
					       struct nlattr *tb[],
1108
					       struct net_device *dev,
1109
					       const unsigned char *addr,
1110 1111
					       u16 flags);
	int			(*ndo_fdb_del)(struct ndmsg *ndm,
1112
					       struct nlattr *tb[],
1113
					       struct net_device *dev,
1114
					       const unsigned char *addr);
1115 1116 1117
	int			(*ndo_fdb_dump)(struct sk_buff *skb,
						struct netlink_callback *cb,
						struct net_device *dev,
1118
						struct net_device *filter_dev,
1119
						int idx);
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John Fastabend 已提交
1120 1121 1122 1123 1124

	int			(*ndo_bridge_setlink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
						      u32 pid, u32 seq,
1125 1126
						      struct net_device *dev,
						      u32 filter_mask);
1127 1128
	int			(*ndo_bridge_dellink)(struct net_device *dev,
						      struct nlmsghdr *nlh);
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Jiri Pirko 已提交
1129 1130
	int			(*ndo_change_carrier)(struct net_device *dev,
						      bool new_carrier);
1131 1132
	int			(*ndo_get_phys_port_id)(struct net_device *dev,
							struct netdev_phys_port_id *ppid);
1133 1134
	void			(*ndo_add_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
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Joseph Gasparakis 已提交
1135
						      __be16 port);
1136 1137
	void			(*ndo_del_vxlan_port)(struct  net_device *dev,
						      sa_family_t sa_family,
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Joseph Gasparakis 已提交
1138
						      __be16 port);
1139 1140 1141 1142 1143 1144 1145 1146 1147

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

	netdev_tx_t		(*ndo_dfwd_start_xmit) (struct sk_buff *skb,
							struct net_device *dev,
							void *priv);
1148
	int			(*ndo_get_lock_subclass)(struct net_device *dev);
1149 1150
};

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

#define IFF_802_1Q_VLAN			IFF_802_1Q_VLAN
#define IFF_EBRIDGE			IFF_EBRIDGE
#define IFF_SLAVE_INACTIVE		IFF_SLAVE_INACTIVE
#define IFF_MASTER_8023AD		IFF_MASTER_8023AD
#define IFF_MASTER_ALB			IFF_MASTER_ALB
#define IFF_BONDING			IFF_BONDING
#define IFF_SLAVE_NEEDARP		IFF_SLAVE_NEEDARP
#define IFF_ISATAP			IFF_ISATAP
#define IFF_MASTER_ARPMON		IFF_MASTER_ARPMON
#define IFF_WAN_HDLC			IFF_WAN_HDLC
#define IFF_XMIT_DST_RELEASE		IFF_XMIT_DST_RELEASE
#define IFF_DONT_BRIDGE			IFF_DONT_BRIDGE
#define IFF_DISABLE_NETPOLL		IFF_DISABLE_NETPOLL
#define IFF_MACVLAN_PORT		IFF_MACVLAN_PORT
#define IFF_BRIDGE_PORT			IFF_BRIDGE_PORT
#define IFF_OVS_DATAPATH		IFF_OVS_DATAPATH
#define IFF_TX_SKB_SHARING		IFF_TX_SKB_SHARING
#define IFF_UNICAST_FLT			IFF_UNICAST_FLT
#define IFF_TEAM_PORT			IFF_TEAM_PORT
#define IFF_SUPP_NOFCS			IFF_SUPP_NOFCS
#define IFF_LIVE_ADDR_CHANGE		IFF_LIVE_ADDR_CHANGE
#define IFF_MACVLAN			IFF_MACVLAN

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

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1440
struct net_device {
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1441
	char			name[IFNAMSIZ];
1442
	struct hlist_node	name_hlist;
1443
	char 			*ifalias;
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	/*
	 *	I/O specific fields
	 *	FIXME: Merge these and struct ifmap into one
	 */
1448 1449 1450 1451
	unsigned long		mem_end;
	unsigned long		mem_start;
	unsigned long		base_addr;
	int			irq;
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	/*
1454 1455
	 *	Some hardware also needs these fields (state,dev_list,
	 *	napi_list,unreg_list,close_list) but they are not
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	 *	part of the usual set specified in Space.c.
	 */

	unsigned long		state;

1461
	struct list_head	dev_list;
1462
	struct list_head	napi_list;
1463
	struct list_head	unreg_list;
1464
	struct list_head	close_list;
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474

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

	struct {
		struct list_head upper;
		struct list_head lower;
	} all_adj_list;
1475

1476 1477 1478 1479
	netdev_features_t	features;
	netdev_features_t	hw_features;
	netdev_features_t	wanted_features;
	netdev_features_t	vlan_features;
1480
	netdev_features_t	hw_enc_features;
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1481
	netdev_features_t	mpls_features;
1482

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	int			ifindex;
	int			iflink;

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	struct net_device_stats	stats;
1487 1488 1489

	atomic_long_t		rx_dropped;
	atomic_long_t		tx_dropped;
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1491 1492
	atomic_t		carrier_changes;

1493
#ifdef CONFIG_WIRELESS_EXT
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	const struct iw_handler_def *	wireless_handlers;
	struct iw_public_data *	wireless_data;
1496
#endif
1497
	const struct net_device_ops *netdev_ops;
1498
	const struct ethtool_ops *ethtool_ops;
1499
	const struct forwarding_accel_ops *fwd_ops;
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1501 1502
	const struct header_ops *header_ops;

1503 1504 1505
	unsigned int		flags;
	unsigned int		priv_flags;

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1506
	unsigned short		gflags;
1507
	unsigned short		padded;
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1509 1510
	unsigned char		operstate;
	unsigned char		link_mode;
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1512 1513
	unsigned char		if_port;
	unsigned char		dma;
1514

1515 1516 1517
	unsigned int		mtu;
	unsigned short		type;
	unsigned short		hard_header_len;
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1519 1520 1521
	unsigned short		needed_headroom;
	unsigned short		needed_tailroom;

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	/* Interface address info. */
1523 1524 1525
	unsigned char		perm_addr[MAX_ADDR_LEN];
	unsigned char		addr_assign_type;
	unsigned char		addr_len;
1526
	unsigned short		neigh_priv_len;
1527 1528
	unsigned short          dev_id;
	unsigned short          dev_port;
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	spinlock_t		addr_list_lock;
1530 1531 1532 1533
	struct netdev_hw_addr_list	uc;
	struct netdev_hw_addr_list	mc;
	struct netdev_hw_addr_list	dev_addrs;

1534 1535 1536 1537
#ifdef CONFIG_SYSFS
	struct kset		*queues_kset;
#endif

1538 1539
	unsigned char		name_assign_type;

1540
	bool			uc_promisc;
1541 1542
	unsigned int		promiscuity;
	unsigned int		allmulti;
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	/* Protocol specific pointers */
1546

1547
#if IS_ENABLED(CONFIG_VLAN_8021Q)
1548
	struct vlan_info __rcu	*vlan_info;
1549
#endif
1550
#if IS_ENABLED(CONFIG_NET_DSA)
1551
	struct dsa_switch_tree	*dsa_ptr;
1552 1553
#endif
#if IS_ENABLED(CONFIG_TIPC)
1554
	struct tipc_bearer __rcu *tipc_ptr;
1555
#endif
1556 1557 1558 1559 1560 1561
	void 			*atalk_ptr;
	struct in_device __rcu	*ip_ptr;
	struct dn_dev __rcu     *dn_ptr;
	struct inet6_dev __rcu	*ip6_ptr;
	void			*ax25_ptr;
	struct wireless_dev	*ieee80211_ptr;
L
Linus Torvalds 已提交
1562

1563
/*
E
Eric Dumazet 已提交
1564
 * Cache lines mostly used on receive path (including eth_type_trans())
1565
 */
1566
	unsigned long		last_rx;
1567

1568
	/* Interface address info used in eth_type_trans() */
1569
	unsigned char		*dev_addr;
1570

T
Tom Herbert 已提交
1571

1572
#ifdef CONFIG_SYSFS
T
Tom Herbert 已提交
1573 1574 1575
	struct netdev_rx_queue	*_rx;

	unsigned int		num_rx_queues;
1576
	unsigned int		real_num_rx_queues;
1577

E
Eric Dumazet 已提交
1578
#endif
T
Tom Herbert 已提交
1579

1580 1581
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1582

1583
	struct netdev_queue __rcu *ingress_queue;
1584
	unsigned char		broadcast[MAX_ADDR_LEN];
1585

E
Eric Dumazet 已提交
1586 1587 1588 1589

/*
 * Cache lines mostly used on transmit path
 */
1590 1591
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
	unsigned int		num_tx_queues;
1592
	unsigned int		real_num_tx_queues;
1593
	struct Qdisc		*qdisc;
1594
	unsigned long		tx_queue_len;
1595
	spinlock_t		tx_global_lock;
E
Eric Dumazet 已提交
1596

T
Tom Herbert 已提交
1597
#ifdef CONFIG_XPS
E
Eric Dumazet 已提交
1598
	struct xps_dev_maps __rcu *xps_maps;
T
Tom Herbert 已提交
1599
#endif
1600 1601 1602
#ifdef CONFIG_RFS_ACCEL
	struct cpu_rmap		*rx_cpu_rmap;
#endif
T
Tom Herbert 已提交
1603

1604
	/* These may be needed for future network-power-down code. */
1605 1606 1607 1608 1609

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1610
	unsigned long		trans_start;
1611

1612
	int			watchdog_timeo;
1613 1614
	struct timer_list	watchdog_timer;

E
Eric Dumazet 已提交
1615
	int __percpu		*pcpu_refcnt;
L
Linus Torvalds 已提交
1616 1617
	struct list_head	todo_list;

1618
	struct hlist_node	index_hlist;
1619
	struct list_head	link_watch_list;
1620

L
Linus Torvalds 已提交
1621
	enum { NETREG_UNINITIALIZED=0,
1622
	       NETREG_REGISTERED,	/* completed register_netdevice */
L
Linus Torvalds 已提交
1623 1624 1625
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1626
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1627 1628
	} reg_state:8;

1629
	bool dismantle;
1630 1631 1632 1633 1634

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
L
Linus Torvalds 已提交
1635

1636
	void (*destructor)(struct net_device *dev);
L
Linus Torvalds 已提交
1637 1638

#ifdef CONFIG_NETPOLL
1639
	struct netpoll_info __rcu	*npinfo;
L
Linus Torvalds 已提交
1640
#endif
1641

1642
#ifdef CONFIG_NET_NS
1643
	struct net		*nd_net;
1644
#endif
1645

D
David S. Miller 已提交
1646
	/* mid-layer private */
E
Eric Dumazet 已提交
1647
	union {
1648 1649
		void					*ml_priv;
		struct pcpu_lstats __percpu		*lstats;
1650
		struct pcpu_sw_netstats __percpu	*tstats;
1651 1652
		struct pcpu_dstats __percpu		*dstats;
		struct pcpu_vstats __percpu		*vstats;
E
Eric Dumazet 已提交
1653
	};
1654

E
Eric Dumazet 已提交
1655
	struct garp_port __rcu	*garp_port;
1656
	struct mrp_port __rcu	*mrp_port;
L
Linus Torvalds 已提交
1657

1658
	struct device	dev;
1659
	const struct attribute_group *sysfs_groups[4];
1660
	const struct attribute_group *sysfs_rx_queue_group;
P
Patrick McHardy 已提交
1661 1662

	const struct rtnl_link_ops *rtnl_link_ops;
1663

1664 1665 1666
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1667 1668
#define GSO_MAX_SEGS		65535
	u16			gso_max_segs;
1669

J
Jeff Kirsher 已提交
1670
#ifdef CONFIG_DCB
1671
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1672
#endif
1673 1674 1675
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1676

1677
#if IS_ENABLED(CONFIG_FCOE)
1678
	unsigned int		fcoe_ddp_xid;
1679
#endif
1680
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
1681
	struct netprio_map __rcu *priomap;
1682
#endif
1683
	struct phy_device *phydev;
1684
	struct lock_class_key *qdisc_tx_busylock;
1685
	int group;
1686
	struct pm_qos_request	pm_qos_req;
L
Linus Torvalds 已提交
1687
};
1688
#define to_net_dev(d) container_of(d, struct net_device, dev)
L
Linus Torvalds 已提交
1689 1690 1691

#define	NETDEV_ALIGN		32

1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742
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;
}

1743 1744 1745 1746 1747 1748 1749
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
					 unsigned int index)
{
	return &dev->_tx[index];
}

1750 1751 1752 1753 1754 1755
static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
						    const struct sk_buff *skb)
{
	return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
}

1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
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);
}

1768
struct netdev_queue *netdev_pick_tx(struct net_device *dev,
1769 1770
				    struct sk_buff *skb,
				    void *accel_priv);
1771

1772 1773 1774 1775 1776 1777
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
Eric Dumazet 已提交
1778
	return read_pnet(&dev->nd_net);
1779 1780 1781
}

static inline
1782
void dev_net_set(struct net_device *dev, struct net *net)
1783 1784
{
#ifdef CONFIG_NET_NS
1785 1786
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1787 1788 1789
#endif
}

1790
static inline bool netdev_uses_dsa(struct net_device *dev)
1791
{
1792
#ifdef CONFIG_NET_DSA
1793 1794
	if (dev->dsa_ptr != NULL)
		return dsa_uses_tagged_protocol(dev->dsa_ptr);
1795
#endif
1796
	return false;
1797 1798
}

1799 1800 1801 1802 1803 1804
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1805
static inline void *netdev_priv(const struct net_device *dev)
L
Linus Torvalds 已提交
1806
{
1807
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
L
Linus Torvalds 已提交
1808 1809 1810 1811 1812
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1813
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
L
Linus Torvalds 已提交
1814

1815
/* Set the sysfs device type for the network logical device to allow
1816
 * fine-grained identification of different network device types. For
1817 1818 1819 1820
 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

E
Eric Dumazet 已提交
1821 1822 1823 1824 1825
/* Default NAPI poll() weight
 * Device drivers are strongly advised to not use bigger value
 */
#define NAPI_POLL_WEIGHT 64

1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
/**
 *	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.
 */
1836 1837
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1838

1839 1840 1841 1842 1843 1844
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1845 1846 1847
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1848 1849 1850
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1851 1852 1853
	/* Length of frag0. */
	unsigned int frag0_len;

1854 1855 1856
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1857
	/* This is non-zero if the packet cannot be merged with the new skb. */
1858 1859 1860 1861
	u16	flush;

	/* Save the IP ID here and check when we get to the transport layer */
	u16	flush_id;
1862 1863

	/* Number of segments aggregated. */
1864 1865 1866 1867
	u16	count;

	/* This is non-zero if the packet may be of the same flow. */
	u8	same_flow;
H
Herbert Xu 已提交
1868 1869

	/* Free the skb? */
1870
	u8	free;
1871 1872
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2
1873 1874 1875

	/* jiffies when first packet was created/queued */
	unsigned long age;
1876 1877

	/* Used in ipv6_gro_receive() */
1878 1879 1880
	u16	proto;

	/* Used in udp_gro_receive */
T
Tom Herbert 已提交
1881 1882 1883 1884 1885
	u8	udp_mark:1;

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

1886 1887
	/* Number of checksums via CHECKSUM_UNNECESSARY */
	u8	csum_cnt:3;
1888

1889 1890 1891
	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
	__wsum	csum;

1892 1893
	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
1894 1895 1896
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1897

L
Linus Torvalds 已提交
1898
struct packet_type {
D
David S. Miller 已提交
1899 1900 1901 1902 1903 1904
	__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 *);
1905 1906
	bool			(*id_match)(struct packet_type *ptype,
					    struct sock *sk);
L
Linus Torvalds 已提交
1907 1908 1909 1910
	void			*af_packet_priv;
	struct list_head	list;
};

1911
struct offload_callbacks {
1912
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
1913
						netdev_features_t features);
1914
	int			(*gso_send_check)(struct sk_buff *skb);
1915 1916
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
1917
	int			(*gro_complete)(struct sk_buff *skb, int nhoff);
1918 1919 1920 1921 1922 1923
};

struct packet_offload {
	__be16			 type;	/* This is really htons(ether_type). */
	struct offload_callbacks callbacks;
	struct list_head	 list;
L
Linus Torvalds 已提交
1924 1925
};

1926 1927 1928 1929 1930
struct udp_offload {
	__be16			 port;
	struct offload_callbacks callbacks;
};

1931 1932 1933 1934 1935 1936 1937
struct dsa_device_ops {
	netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);
	int (*rcv)(struct sk_buff *skb, struct net_device *dev,
		   struct packet_type *pt, struct net_device *orig_dev);
};


1938 1939 1940 1941 1942 1943 1944 1945 1946
/* often modified stats are per cpu, other are shared (netdev->stats) */
struct pcpu_sw_netstats {
	u64     rx_packets;
	u64     rx_bytes;
	u64     tx_packets;
	u64     tx_bytes;
	struct u64_stats_sync   syncp;
};

1947 1948
#define netdev_alloc_pcpu_stats(type)				\
({								\
1949
	typeof(type) __percpu *pcpu_stats = alloc_percpu(type); \
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
	if (pcpu_stats)	{					\
		int i;						\
		for_each_possible_cpu(i) {			\
			typeof(type) *stat;			\
			stat = per_cpu_ptr(pcpu_stats, i);	\
			u64_stats_init(&stat->syncp);		\
		}						\
	}							\
	pcpu_stats;						\
})

L
Linus Torvalds 已提交
1961 1962
#include <linux/notifier.h>

1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
/* 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
1976
#define NETDEV_CHANGEMTU	0x0007 /* notify after mtu change happened */
1977 1978 1979 1980 1981 1982 1983 1984 1985
#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
1986
#define NETDEV_UNREGISTER_FINAL 0x0011
1987 1988 1989
#define NETDEV_RELEASE		0x0012
#define NETDEV_NOTIFY_PEERS	0x0013
#define NETDEV_JOIN		0x0014
1990
#define NETDEV_CHANGEUPPER	0x0015
1991
#define NETDEV_RESEND_IGMP	0x0016
1992
#define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
1993
#define NETDEV_CHANGEINFODATA	0x0018
1994

1995 1996
int register_netdevice_notifier(struct notifier_block *nb);
int unregister_netdevice_notifier(struct notifier_block *nb);
1997 1998 1999 2000 2001

struct netdev_notifier_info {
	struct net_device *dev;
};

2002 2003 2004 2005 2006
struct netdev_notifier_change_info {
	struct netdev_notifier_info info; /* must be first */
	unsigned int flags_changed;
};

2007 2008 2009 2010 2011 2012
static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
					     struct net_device *dev)
{
	info->dev = dev;
}

2013 2014 2015 2016 2017 2018
static inline struct net_device *
netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
{
	return info->dev;
}

2019
int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
2020 2021


L
Linus Torvalds 已提交
2022 2023
extern rwlock_t				dev_base_lock;		/* Device list lock */

2024 2025
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
2026 2027
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
2028 2029
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
2030 2031 2032 2033
#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)
2034 2035
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
2036 2037 2038
#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)
2039
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
2040

2041 2042 2043 2044 2045
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

2046
	net = dev_net(dev);
2047 2048 2049 2050
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2051 2052 2053 2054 2055 2056
static inline struct net_device *next_net_device_rcu(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

	net = dev_net(dev);
E
Eric Dumazet 已提交
2057
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
2058 2059 2060
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

2061 2062 2063 2064 2065
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);
}
2066

E
Eric Dumazet 已提交
2067 2068 2069 2070 2071 2072 2073
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);
}

2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096
int netdev_boot_setup_check(struct net_device *dev);
unsigned long netdev_boot_base(const char *prefix, int unit);
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
				       const char *hwaddr);
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
void dev_add_pack(struct packet_type *pt);
void dev_remove_pack(struct packet_type *pt);
void __dev_remove_pack(struct packet_type *pt);
void dev_add_offload(struct packet_offload *po);
void dev_remove_offload(struct packet_offload *po);

struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
					unsigned short mask);
struct net_device *dev_get_by_name(struct net *net, const char *name);
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
struct net_device *__dev_get_by_name(struct net *net, const char *name);
int dev_alloc_name(struct net_device *dev, const char *name);
int dev_open(struct net_device *dev);
int dev_close(struct net_device *dev);
void dev_disable_lro(struct net_device *dev);
int dev_loopback_xmit(struct sk_buff *newskb);
int dev_queue_xmit(struct sk_buff *skb);
2097
int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
2098 2099 2100
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);
2101 2102 2103 2104 2105
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

2106 2107
int netdev_refcnt_read(const struct net_device *dev);
void free_netdev(struct net_device *dev);
2108
void netdev_freemem(struct net_device *dev);
2109 2110
void synchronize_net(void);
int init_dummy_netdev(struct net_device *dev);
2111

2112 2113 2114 2115 2116 2117
struct net_device *dev_get_by_index(struct net *net, int ifindex);
struct net_device *__dev_get_by_index(struct net *net, int ifindex);
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
int netdev_get_name(struct net *net, char *name, int ifindex);
int dev_restart(struct net_device *dev);
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133

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;
}

2134 2135
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
2136
{
2137 2138
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
2139

2140 2141 2142 2143
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
2144

2145 2146 2147
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
2148 2149 2150
	if (!pskb_may_pull(skb, hlen))
		return NULL;

2151 2152
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
2153
	return skb->data + offset;
2154
}
L
Linus Torvalds 已提交
2155

H
Herbert Xu 已提交
2156 2157
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
2158 2159
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
2160 2161
}

2162 2163 2164
static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
					const void *start, unsigned int len)
{
T
Tom Herbert 已提交
2165
	if (NAPI_GRO_CB(skb)->csum_valid)
2166 2167 2168 2169
		NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
						  csum_partial(start, len, 0));
}

T
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2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
/* GRO checksum functions. These are logical equivalents of the normal
 * checksum functions (in skbuff.h) except that they operate on the GRO
 * offsets and fields in sk_buff.
 */

__sum16 __skb_gro_checksum_complete(struct sk_buff *skb);

static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
						      bool zero_okay,
						      __sum16 check)
{
	return (skb->ip_summed != CHECKSUM_PARTIAL &&
2182
		NAPI_GRO_CB(skb)->csum_cnt == 0 &&
T
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2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199
		(!zero_okay || check));
}

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

	NAPI_GRO_CB(skb)->csum = psum;

	return __skb_gro_checksum_complete(skb);
}

static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb)
{
2200 2201 2202 2203 2204 2205 2206 2207 2208
	if (NAPI_GRO_CB(skb)->csum_cnt > 0) {
		/* Consume a checksum from CHECKSUM_UNNECESSARY */
		NAPI_GRO_CB(skb)->csum_cnt--;
	} else {
		/* Update skb for CHECKSUM_UNNECESSARY and csum_level when we
		 * verified a new top level checksum or an encapsulated one
		 * during GRO. This saves work if we fallback to normal path.
		 */
		__skb_incr_checksum_unnecessary(skb);
T
Tom Herbert 已提交
2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
	}
}

#define __skb_gro_checksum_validate(skb, proto, zero_okay, check,	\
				    compute_pseudo)			\
({									\
	__sum16 __ret = 0;						\
	if (__skb_gro_checksum_validate_needed(skb, zero_okay, check))	\
		__ret = __skb_gro_checksum_validate_complete(skb,	\
				compute_pseudo(skb, proto));		\
2219 2220 2221
	if (__ret)							\
		__skb_mark_checksum_bad(skb);				\
	else								\
T
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2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235
		skb_gro_incr_csum_unnecessary(skb);			\
	__ret;								\
})

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

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

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

2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255
static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb)
{
	return (NAPI_GRO_CB(skb)->csum_cnt == 0 &&
		!NAPI_GRO_CB(skb)->csum_valid);
}

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

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

2256 2257
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
2258
				  const void *daddr, const void *saddr,
2259
				  unsigned int len)
2260
{
2261
	if (!dev->header_ops || !dev->header_ops->create)
2262
		return 0;
2263 2264

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
2265 2266
}

S
Stephen Hemminger 已提交
2267 2268 2269 2270 2271
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

2272
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
2273
		return 0;
2274
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
2275 2276
}

2277 2278 2279 2280 2281 2282 2283 2284 2285
static inline int dev_rebuild_header(struct sk_buff *skb)
{
	const struct net_device *dev = skb->dev;

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

L
Linus Torvalds 已提交
2286
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
2287
int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
L
Linus Torvalds 已提交
2288 2289 2290 2291 2292
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

2293
#ifdef CONFIG_NET_FLOW_LIMIT
2294
#define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305
struct sd_flow_limit {
	u64			count;
	unsigned int		num_buckets;
	unsigned int		history_head;
	u16			history[FLOW_LIMIT_HISTORY];
	u8			buckets[];
};

extern int netdev_flow_limit_table_len;
#endif /* CONFIG_NET_FLOW_LIMIT */

L
Linus Torvalds 已提交
2306
/*
E
Eric Dumazet 已提交
2307
 * Incoming packets are placed on per-cpu queues
L
Linus Torvalds 已提交
2308
 */
E
Eric Dumazet 已提交
2309
struct softnet_data {
2310
	struct Qdisc		*output_queue;
2311
	struct Qdisc		**output_queue_tailp;
L
Linus Torvalds 已提交
2312 2313
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
2314
	struct sk_buff_head	process_queue;
L
Linus Torvalds 已提交
2315

C
Changli Gao 已提交
2316
	/* stats */
2317 2318 2319 2320
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
C
Changli Gao 已提交
2321

2322
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
2323 2324 2325
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
T
Tom Herbert 已提交
2326
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
2327 2328
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
Tom Herbert 已提交
2329
	unsigned int		input_queue_head;
2330
	unsigned int		input_queue_tail;
2331
#endif
2332
	unsigned int		dropped;
T
Tom Herbert 已提交
2333
	struct sk_buff_head	input_pkt_queue;
2334
	struct napi_struct	backlog;
2335 2336

#ifdef CONFIG_NET_FLOW_LIMIT
2337
	struct sd_flow_limit __rcu *flow_limit;
2338
#endif
L
Linus Torvalds 已提交
2339 2340
};

2341
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
2342 2343
{
#ifdef CONFIG_RPS
2344 2345 2346 2347 2348 2349 2350 2351 2352
	sd->input_queue_head++;
#endif
}

static inline void input_queue_tail_incr_save(struct softnet_data *sd,
					      unsigned int *qtail)
{
#ifdef CONFIG_RPS
	*qtail = ++sd->input_queue_tail;
T
Tom Herbert 已提交
2353 2354 2355
#endif
}

T
Tom Herbert 已提交
2356
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
2357

2358
void __netif_schedule(struct Qdisc *q);
2359
void netif_schedule_queue(struct netdev_queue *txq);
2360

2361 2362 2363 2364 2365 2366 2367 2368
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));
}

2369 2370
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
2371
	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2372 2373
}

2374 2375 2376 2377 2378 2379
/**
 *	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
2380 2381
static inline void netif_start_queue(struct net_device *dev)
{
2382
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2383 2384
}

2385 2386 2387 2388 2389 2390 2391 2392 2393 2394
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);
	}
}

2395
void netif_tx_wake_queue(struct netdev_queue *dev_queue);
2396

2397 2398 2399 2400 2401 2402 2403
/**
 *	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.
 */
2404 2405
static inline void netif_wake_queue(struct net_device *dev)
{
2406
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2407 2408
}

2409 2410 2411 2412 2413 2414 2415 2416 2417 2418
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);
	}
}

2419 2420
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
2421
	if (WARN_ON(!dev_queue)) {
2422
		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
2423 2424
		return;
	}
2425
	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2426 2427
}

2428 2429 2430 2431 2432 2433 2434
/**
 *	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
2435 2436
static inline void netif_stop_queue(struct net_device *dev)
{
2437
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2438 2439
}

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

2450
static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
2451
{
2452
	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
2453 2454
}

2455 2456 2457 2458 2459 2460
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
2461
static inline bool netif_queue_stopped(const struct net_device *dev)
L
Linus Torvalds 已提交
2462
{
2463
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
2464 2465
}

2466
static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
2467
{
2468 2469 2470
	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

2471 2472
static inline bool
netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
2473 2474 2475 2476
{
	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

2477 2478 2479 2480 2481 2482
static inline bool
netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue)
{
	return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN;
}

2483 2484 2485
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
					unsigned int bytes)
{
T
Tom Herbert 已提交
2486 2487
#ifdef CONFIG_BQL
	dql_queued(&dev_queue->dql, bytes);
2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503

	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
2504
#endif
2505 2506
}

2507 2508 2509 2510 2511 2512 2513 2514 2515
/**
 * 	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
 */
2516 2517 2518 2519 2520 2521
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,
2522
					     unsigned int pkts, unsigned int bytes)
2523
{
T
Tom Herbert 已提交
2524
#ifdef CONFIG_BQL
2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541
	if (unlikely(!bytes))
		return;

	dql_completed(&dev_queue->dql, bytes);

	/*
	 * Without the memory barrier there is a small possiblity that
	 * netdev_tx_sent_queue will miss the update and cause the queue to
	 * be stopped forever
	 */
	smp_mb();

	if (dql_avail(&dev_queue->dql) < 0)
		return;

	if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
		netif_schedule_queue(dev_queue);
T
Tom Herbert 已提交
2542
#endif
2543 2544
}

2545 2546 2547 2548 2549 2550 2551 2552 2553 2554
/**
 * 	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()
 */
2555
static inline void netdev_completed_queue(struct net_device *dev,
2556
					  unsigned int pkts, unsigned int bytes)
2557 2558 2559 2560 2561 2562
{
	netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
}

static inline void netdev_tx_reset_queue(struct netdev_queue *q)
{
T
Tom Herbert 已提交
2563
#ifdef CONFIG_BQL
2564
	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
T
Tom Herbert 已提交
2565 2566
	dql_reset(&q->dql);
#endif
2567 2568
}

2569 2570 2571 2572 2573 2574 2575
/**
 * 	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
 */
2576 2577 2578
static inline void netdev_reset_queue(struct net_device *dev_queue)
{
	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
2579 2580
}

2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600
/**
 * 	netdev_cap_txqueue - check if selected tx queue exceeds device queues
 * 	@dev: network device
 * 	@queue_index: given tx queue index
 *
 * 	Returns 0 if given tx queue index >= number of device tx queues,
 * 	otherwise returns the originally passed tx queue index.
 */
static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index)
{
	if (unlikely(queue_index >= dev->real_num_tx_queues)) {
		net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
				     dev->name, queue_index,
				     dev->real_num_tx_queues);
		return 0;
	}

	return queue_index;
}

2601 2602 2603 2604 2605 2606
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
2607
static inline bool netif_running(const struct net_device *dev)
L
Linus Torvalds 已提交
2608 2609 2610 2611
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

2612 2613 2614 2615 2616 2617
/*
 * 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.
 */
2618 2619 2620 2621 2622 2623 2624 2625

/**
 *	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.
 */
2626 2627
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
2628
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2629 2630

	netif_tx_start_queue(txq);
2631 2632
}

2633 2634 2635 2636 2637 2638 2639
/**
 *	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.
 */
2640 2641
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
2642
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2643
	netif_tx_stop_queue(txq);
2644 2645
}

2646 2647 2648 2649 2650 2651 2652
/**
 *	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.
 */
2653 2654
static inline bool __netif_subqueue_stopped(const struct net_device *dev,
					    u16 queue_index)
2655
{
2656
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2657 2658

	return netif_tx_queue_stopped(txq);
2659 2660
}

2661 2662
static inline bool netif_subqueue_stopped(const struct net_device *dev,
					  struct sk_buff *skb)
2663 2664 2665
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
2666

2667
void netif_wake_subqueue(struct net_device *dev, u16 queue_index);
2668

2669
#ifdef CONFIG_XPS
2670
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2671
			u16 index);
2672 2673
#else
static inline int netif_set_xps_queue(struct net_device *dev,
2674
				      const struct cpumask *mask,
2675 2676 2677 2678 2679 2680
				      u16 index)
{
	return 0;
}
#endif

2681 2682 2683 2684 2685
/*
 * 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,
2686
			      struct sk_buff *skb)
2687 2688 2689 2690
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

2691 2692 2693 2694 2695 2696
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
2697
static inline bool netif_is_multiqueue(const struct net_device *dev)
2698
{
E
Eric Dumazet 已提交
2699
	return dev->num_tx_queues > 1;
2700
}
L
Linus Torvalds 已提交
2701

2702
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
2703

2704
#ifdef CONFIG_SYSFS
2705
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
2706 2707 2708 2709 2710 2711 2712 2713
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

2714 2715 2716
static inline int netif_copy_real_num_queues(struct net_device *to_dev,
					     const struct net_device *from_dev)
{
2717 2718 2719 2720 2721 2722
	int err;

	err = netif_set_real_num_tx_queues(to_dev,
					   from_dev->real_num_tx_queues);
	if (err)
		return err;
2723
#ifdef CONFIG_SYSFS
2724 2725 2726 2727 2728 2729 2730
	return netif_set_real_num_rx_queues(to_dev,
					    from_dev->real_num_rx_queues);
#else
	return 0;
#endif
}

2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742
#ifdef CONFIG_SYSFS
static inline unsigned int get_netdev_rx_queue_index(
		struct netdev_rx_queue *queue)
{
	struct net_device *dev = queue->dev;
	int index = queue - dev->_rx;

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

2743
#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
2744
int netif_get_num_default_rss_queues(void);
2745

2746 2747 2748 2749 2750 2751 2752
enum skb_free_reason {
	SKB_REASON_CONSUMED,
	SKB_REASON_DROPPED,
};

void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason);
void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason);
L
Linus Torvalds 已提交
2753

2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771
/*
 * It is not allowed to call kfree_skb() or consume_skb() from hardware
 * interrupt context or with hardware interrupts being disabled.
 * (in_irq() || irqs_disabled())
 *
 * We provide four helpers that can be used in following contexts :
 *
 * dev_kfree_skb_irq(skb) when caller drops a packet from irq context,
 *  replacing kfree_skb(skb)
 *
 * dev_consume_skb_irq(skb) when caller consumes a packet from irq context.
 *  Typically used in place of consume_skb(skb) in TX completion path
 *
 * dev_kfree_skb_any(skb) when caller doesn't know its current irq context,
 *  replacing kfree_skb(skb)
 *
 * dev_consume_skb_any(skb) when caller doesn't know its current irq context,
 *  and consumed a packet. Used in place of consume_skb(skb)
L
Linus Torvalds 已提交
2772
 */
2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791
static inline void dev_kfree_skb_irq(struct sk_buff *skb)
{
	__dev_kfree_skb_irq(skb, SKB_REASON_DROPPED);
}

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

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

static inline void dev_consume_skb_any(struct sk_buff *skb)
{
	__dev_kfree_skb_any(skb, SKB_REASON_CONSUMED);
}
L
Linus Torvalds 已提交
2792

2793 2794 2795 2796 2797 2798 2799
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);
2800 2801
struct packet_offload *gro_find_receive_by_type(__be16 type);
struct packet_offload *gro_find_complete_by_type(__be16 type);
2802 2803 2804 2805 2806 2807 2808

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

2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819
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);
2820 2821
void __dev_notify_flags(struct net_device *, unsigned int old_flags,
			unsigned int gchanges);
2822 2823 2824 2825 2826 2827 2828 2829 2830
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);
2831
struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev);
2832 2833
struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
				    struct netdev_queue *txq, int *ret);
H
Herbert Xu 已提交
2834
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
2835
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
2836
bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb);
L
Linus Torvalds 已提交
2837

2838
extern int		netdev_budget;
L
Linus Torvalds 已提交
2839 2840

/* Called by rtnetlink.c:rtnl_unlock() */
2841
void netdev_run_todo(void);
L
Linus Torvalds 已提交
2842

2843 2844 2845 2846
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
2847
 * Release reference to device to allow it to be freed.
2848
 */
L
Linus Torvalds 已提交
2849 2850
static inline void dev_put(struct net_device *dev)
{
2851
	this_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
2852 2853
}

2854 2855 2856 2857
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
2858
 * Hold reference to device to keep it from being freed.
2859
 */
2860 2861
static inline void dev_hold(struct net_device *dev)
{
2862
	this_cpu_inc(*dev->pcpu_refcnt);
2863
}
L
Linus Torvalds 已提交
2864 2865 2866 2867

/* 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
2868 2869 2870 2871
 *
 * 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
2872 2873
 */

2874 2875 2876
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
2877

2878 2879 2880 2881 2882 2883
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2884
static inline bool netif_carrier_ok(const struct net_device *dev)
L
Linus Torvalds 已提交
2885 2886 2887 2888
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

2889
unsigned long dev_trans_start(struct net_device *dev);
2890

2891
void __netdev_watchdog_up(struct net_device *dev);
L
Linus Torvalds 已提交
2892

2893
void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
2894

2895
void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
2896

2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909
/**
 *	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
2910 2911 2912 2913 2914 2915
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2916 2917 2918 2919 2920 2921
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
2922 2923 2924 2925 2926 2927
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2928 2929 2930 2931 2932 2933
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
2934
static inline bool netif_dormant(const struct net_device *dev)
S
Stefan Rompf 已提交
2935 2936 2937 2938 2939
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2940 2941 2942 2943 2944 2945
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
2946
static inline bool netif_oper_up(const struct net_device *dev)
E
Eric Dumazet 已提交
2947
{
S
Stefan Rompf 已提交
2948 2949 2950 2951
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

2952 2953 2954 2955 2956 2957
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
2958
static inline bool netif_device_present(struct net_device *dev)
L
Linus Torvalds 已提交
2959 2960 2961 2962
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

2963
void netif_device_detach(struct net_device *dev);
L
Linus Torvalds 已提交
2964

2965
void netif_device_attach(struct net_device *dev);
L
Linus Torvalds 已提交
2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015

/*
 * 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;
}

3016
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
3017
{
3018 3019
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
3020 3021
}

3022 3023 3024 3025 3026 3027
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

3028
static inline bool __netif_tx_trylock(struct netdev_queue *txq)
3029
{
3030
	bool ok = spin_trylock(&txq->_xmit_lock);
3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047
	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
3048 3049 3050 3051 3052 3053
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

3054 3055 3056 3057 3058 3059
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
3060 3061
static inline void netif_tx_lock(struct net_device *dev)
{
3062
	unsigned int i;
3063
	int cpu;
3064

3065 3066
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
3067 3068
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3069 3070 3071 3072 3073 3074 3075

		/* 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.
		 */
3076
		__netif_tx_lock(txq, cpu);
3077 3078
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
3079
	}
H
Herbert Xu 已提交
3080 3081 3082 3083
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
3084 3085
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
3086 3087 3088 3089
}

static inline void netif_tx_unlock(struct net_device *dev)
{
3090 3091 3092 3093
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3094

3095 3096 3097 3098 3099
		/* 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);
3100
		netif_schedule_queue(txq);
3101 3102
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
3103 3104 3105 3106
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
3107 3108
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
3109 3110
}

3111
#define HARD_TX_LOCK(dev, txq, cpu) {			\
3112
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3113
		__netif_tx_lock(txq, cpu);		\
3114 3115 3116
	}						\
}

3117 3118 3119 3120 3121
#define HARD_TX_TRYLOCK(dev, txq)			\
	(((dev->features & NETIF_F_LLTX) == 0) ?	\
		__netif_tx_trylock(txq) :		\
		true )

3122
#define HARD_TX_UNLOCK(dev, txq) {			\
3123
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
3124
		__netif_tx_unlock(txq);			\
3125 3126 3127
	}						\
}

L
Linus Torvalds 已提交
3128 3129
static inline void netif_tx_disable(struct net_device *dev)
{
3130
	unsigned int i;
3131
	int cpu;
3132

3133 3134
	local_bh_disable();
	cpu = smp_processor_id();
3135 3136
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
3137 3138

		__netif_tx_lock(txq, cpu);
3139
		netif_tx_stop_queue(txq);
3140
		__netif_tx_unlock(txq);
3141
	}
3142
	local_bh_enable();
L
Linus Torvalds 已提交
3143 3144
}

3145 3146 3147 3148 3149
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

3150 3151
static inline void netif_addr_lock_nested(struct net_device *dev)
{
3152 3153 3154 3155 3156 3157
	int subclass = SINGLE_DEPTH_NESTING;

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

	spin_lock_nested(&dev->addr_list_lock, subclass);
3158 3159
}

3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174
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);
}

3175
/*
3176
 * dev_addrs walker. Should be used only for read access. Call with
3177 3178 3179
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
3180
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
3181

L
Linus Torvalds 已提交
3182 3183
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

3184
void ether_setup(struct net_device *dev);
L
Linus Torvalds 已提交
3185 3186

/* Support for loadable net-drivers */
3187
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
3188
				    unsigned char name_assign_type,
3189 3190
				    void (*setup)(struct net_device *),
				    unsigned int txqs, unsigned int rxqs);
3191 3192
#define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \
	alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1)
T
Tom Herbert 已提交
3193

3194 3195 3196
#define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \
	alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \
			 count)
T
Tom Herbert 已提交
3197

3198 3199
int register_netdev(struct net_device *dev);
void unregister_netdev(struct net_device *dev);
3200

3201
/* General hardware address lists handling functions */
3202 3203 3204 3205
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);
3206 3207 3208 3209 3210 3211 3212 3213 3214
int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
		       struct net_device *dev,
		       int (*sync)(struct net_device *, const unsigned char *),
		       int (*unsync)(struct net_device *,
				     const unsigned char *));
void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
			  struct net_device *dev,
			  int (*unsync)(struct net_device *,
					const unsigned char *));
3215
void __hw_addr_init(struct netdev_hw_addr_list *list);
3216

3217
/* Functions used for device addresses handling */
3218 3219 3220 3221 3222 3223
int dev_addr_add(struct net_device *dev, const unsigned char *addr,
		 unsigned char addr_type);
int dev_addr_del(struct net_device *dev, const unsigned char *addr,
		 unsigned char addr_type);
void dev_addr_flush(struct net_device *dev);
int dev_addr_init(struct net_device *dev);
3224 3225

/* Functions used for unicast addresses handling */
3226 3227 3228 3229 3230 3231 3232 3233
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);
3234

3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253
/**
 *  __dev_uc_sync - Synchonize device's unicast list
 *  @dev:  device to sync
 *  @sync: function to call if address should be added
 *  @unsync: function to call if address should be removed
 *
 *  Add newly added addresses to the interface, and release
 *  addresses that have been deleted.
 **/
static inline int __dev_uc_sync(struct net_device *dev,
				int (*sync)(struct net_device *,
					    const unsigned char *),
				int (*unsync)(struct net_device *,
					      const unsigned char *))
{
	return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
}

/**
3254
 *  __dev_uc_unsync - Remove synchronized addresses from device
3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266
 *  @dev:  device to sync
 *  @unsync: function to call if address should be removed
 *
 *  Remove all addresses that were added to the device by dev_uc_sync().
 **/
static inline void __dev_uc_unsync(struct net_device *dev,
				   int (*unsync)(struct net_device *,
						 const unsigned char *))
{
	__hw_addr_unsync_dev(&dev->uc, dev, unsync);
}

3267
/* Functions used for multicast addresses handling */
3268 3269 3270 3271 3272 3273 3274 3275 3276 3277
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);
3278

3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297
/**
 *  __dev_mc_sync - Synchonize device's multicast list
 *  @dev:  device to sync
 *  @sync: function to call if address should be added
 *  @unsync: function to call if address should be removed
 *
 *  Add newly added addresses to the interface, and release
 *  addresses that have been deleted.
 **/
static inline int __dev_mc_sync(struct net_device *dev,
				int (*sync)(struct net_device *,
					    const unsigned char *),
				int (*unsync)(struct net_device *,
					      const unsigned char *))
{
	return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
}

/**
3298
 *  __dev_mc_unsync - Remove synchronized addresses from device
3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310
 *  @dev:  device to sync
 *  @unsync: function to call if address should be removed
 *
 *  Remove all addresses that were added to the device by dev_mc_sync().
 **/
static inline void __dev_mc_unsync(struct net_device *dev,
				   int (*unsync)(struct net_device *,
						 const unsigned char *))
{
	__hw_addr_unsync_dev(&dev->mc, dev, unsync);
}

3311
/* Functions used for secondary unicast and multicast support */
3312 3313 3314 3315 3316 3317 3318
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
3319
/* Load a device via the kmod */
3320 3321 3322 3323 3324
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);
3325

L
Linus Torvalds 已提交
3326
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
3327
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
3328
extern int		weight_p;
3329
extern int		bpf_jit_enable;
J
Jiri Pirko 已提交
3330

3331
bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
3332 3333
struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3334 3335
struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
						     struct list_head **iter);
3336

3337 3338 3339 3340 3341 3342 3343
/* iterate through upper list, must be called under RCU read lock */
#define netdev_for_each_upper_dev_rcu(dev, updev, iter) \
	for (iter = &(dev)->adj_list.upper, \
	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
	     updev; \
	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))

3344
/* iterate through upper list, must be called under RCU read lock */
3345 3346 3347 3348 3349
#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)))
3350

3351 3352 3353 3354
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);
3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367

#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)))

3368 3369 3370 3371 3372 3373 3374 3375
void *netdev_lower_get_next(struct net_device *dev,
				struct list_head **iter);
#define netdev_for_each_lower_dev(dev, ldev, iter) \
	for (iter = &(dev)->adj_list.lower, \
	     ldev = netdev_lower_get_next(dev, &(iter)); \
	     ldev; \
	     ldev = netdev_lower_get_next(dev, &(iter)))

3376
void *netdev_adjacent_get_private(struct list_head *adj_list);
3377
void *netdev_lower_get_first_private_rcu(struct net_device *dev);
3378 3379 3380 3381
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
3382
				 struct net_device *upper_dev);
3383 3384 3385 3386 3387
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);
3388
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
3389 3390
void *netdev_lower_dev_get_private(struct net_device *dev,
				   struct net_device *lower_dev);
3391 3392
int dev_get_nest_level(struct net_device *dev,
		       bool (*type_check)(struct net_device *dev));
3393 3394 3395 3396 3397
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);
3398 3399 3400 3401 3402 3403

static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
	return __skb_gso_segment(skb, features, true);
}
3404
__be16 skb_network_protocol(struct sk_buff *skb, int *depth);
3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416

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)));
}
3417

3418
#ifdef CONFIG_BUG
3419
void netdev_rx_csum_fault(struct net_device *dev);
3420 3421 3422 3423 3424
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
L
Linus Torvalds 已提交
3425
/* rx skb timestamps */
3426 3427
void net_enable_timestamp(void);
void net_disable_timestamp(void);
L
Linus Torvalds 已提交
3428

3429
#ifdef CONFIG_PROC_FS
3430
int __init dev_proc_init(void);
3431 3432
#else
#define dev_proc_init() 0
3433 3434
#endif

D
David S. Miller 已提交
3435
static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
3436 3437
					      struct sk_buff *skb, struct net_device *dev,
					      bool more)
D
David S. Miller 已提交
3438
{
3439
	skb->xmit_more = more ? 1 : 0;
3440
	return ops->ndo_start_xmit(skb, dev);
D
David S. Miller 已提交
3441 3442
}

3443
static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
3444
					    struct netdev_queue *txq, bool more)
D
David S. Miller 已提交
3445 3446
{
	const struct net_device_ops *ops = dev->netdev_ops;
3447
	int rc;
D
David S. Miller 已提交
3448

3449
	rc = __netdev_start_xmit(ops, skb, dev, more);
3450 3451 3452 3453
	if (rc == NETDEV_TX_OK)
		txq_trans_update(txq);

	return rc;
D
David S. Miller 已提交
3454 3455
}

3456 3457 3458 3459
int netdev_class_create_file_ns(struct class_attribute *class_attr,
				const void *ns);
void netdev_class_remove_file_ns(struct class_attribute *class_attr,
				 const void *ns);
3460 3461 3462 3463 3464 3465 3466 3467 3468 3469

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

static inline void netdev_class_remove_file(struct class_attribute *class_attr)
{
	netdev_class_remove_file_ns(class_attr, NULL);
}
3470

3471 3472
extern struct kobj_ns_type_operations net_ns_type_operations;

3473
const char *netdev_drivername(const struct net_device *dev);
3474

3475
void linkwatch_run_queue(void);
3476

3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490
static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
							  netdev_features_t f2)
{
	if (f1 & NETIF_F_GEN_CSUM)
		f1 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
	if (f2 & NETIF_F_GEN_CSUM)
		f2 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
	f1 &= f2;
	if (f1 & NETIF_F_GEN_CSUM)
		f1 &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);

	return f1;
}

3491 3492
static inline netdev_features_t netdev_get_wanted_features(
	struct net_device *dev)
3493 3494 3495
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
3496 3497
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask);
3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508

/* 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);
}

3509
int __netdev_update_features(struct net_device *dev);
3510
void netdev_update_features(struct net_device *dev);
3511
void netdev_change_features(struct net_device *dev);
3512

3513 3514 3515
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

3516
netdev_features_t netif_skb_features(struct sk_buff *skb);
3517

3518
static inline bool net_gso_ok(netdev_features_t features, int gso_type)
3519
{
3520
	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
3521 3522 3523 3524 3525 3526 3527 3528

	/* 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));
3529 3530 3531 3532 3533 3534 3535
	BUILD_BUG_ON(SKB_GSO_GRE     != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_IPIP    != (NETIF_F_GSO_IPIP >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_SIT     != (NETIF_F_GSO_SIT >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
	BUILD_BUG_ON(SKB_GSO_MPLS    != (NETIF_F_GSO_MPLS >> NETIF_F_GSO_SHIFT));
3536

3537
	return (features & feature) == feature;
3538 3539
}

3540
static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
3541
{
H
Herbert Xu 已提交
3542
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
3543
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
3544 3545
}

3546 3547
static inline bool netif_needs_gso(struct sk_buff *skb,
				   netdev_features_t features)
3548
{
3549
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
3550 3551
		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
3552 3553
}

3554 3555 3556 3557 3558 3559
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572
static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
					int pulled_hlen, u16 mac_offset,
					int mac_len)
{
	skb->protocol = protocol;
	skb->encapsulation = 1;
	skb_push(skb, pulled_hlen);
	skb_reset_transport_header(skb);
	skb->mac_header = mac_offset;
	skb->network_header = skb->mac_header + mac_len;
	skb->mac_len = mac_len;
}

3573 3574 3575 3576 3577
static inline bool netif_is_macvlan(struct net_device *dev)
{
	return dev->priv_flags & IFF_MACVLAN;
}

3578 3579 3580 3581 3582
static inline bool netif_is_bond_master(struct net_device *dev)
{
	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
}

3583
static inline bool netif_is_bond_slave(struct net_device *dev)
J
Jiri Pirko 已提交
3584 3585 3586 3587
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

3588 3589 3590 3591 3592
static inline bool netif_supports_nofcs(struct net_device *dev)
{
	return dev->priv_flags & IFF_SUPP_NOFCS;
}

3593
extern struct pernet_operations __net_initdata loopback_net_ops;
3594

3595 3596 3597 3598 3599 3600
/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

static inline const char *netdev_name(const struct net_device *dev)
{
3601 3602
	if (!dev->name[0] || strchr(dev->name, '%'))
		return "(unnamed net_device)";
3603 3604 3605
	return dev->name;
}

3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620
static inline const char *netdev_reg_state(const struct net_device *dev)
{
	switch (dev->reg_state) {
	case NETREG_UNINITIALIZED: return " (uninitialized)";
	case NETREG_REGISTERED: return "";
	case NETREG_UNREGISTERING: return " (unregistering)";
	case NETREG_UNREGISTERED: return " (unregistered)";
	case NETREG_RELEASED: return " (released)";
	case NETREG_DUMMY: return " (dummy)";
	}

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

3621
__printf(3, 4)
3622 3623
int netdev_printk(const char *level, const struct net_device *dev,
		  const char *format, ...);
3624
__printf(2, 3)
3625
int netdev_emerg(const struct net_device *dev, const char *format, ...);
3626
__printf(2, 3)
3627
int netdev_alert(const struct net_device *dev, const char *format, ...);
3628
__printf(2, 3)
3629
int netdev_crit(const struct net_device *dev, const char *format, ...);
3630
__printf(2, 3)
3631
int netdev_err(const struct net_device *dev, const char *format, ...);
3632
__printf(2, 3)
3633
int netdev_warn(const struct net_device *dev, const char *format, ...);
3634
__printf(2, 3)
3635
int netdev_notice(const struct net_device *dev, const char *format, ...);
3636
__printf(2, 3)
3637
int netdev_info(const struct net_device *dev, const char *format, ...);
3638

3639 3640 3641
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

3642
#if defined(CONFIG_DYNAMIC_DEBUG)
3643 3644
#define netdev_dbg(__dev, format, args...)			\
do {								\
3645
	dynamic_netdev_dbg(__dev, format, ##args);		\
3646
} while (0)
3647 3648 3649
#elif defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676
#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...)			\
3677 3678
	WARN(1, "netdevice: %s%s\n" format, netdev_name(dev),	\
	     netdev_reg_state(dev), ##args)
3679

3680 3681 3682 3683 3684 3685 3686 3687
/* 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)

3688 3689 3690 3691 3692 3693
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

3694
#define netif_emerg(priv, type, dev, fmt, args...)		\
3695
	netif_level(emerg, priv, type, dev, fmt, ##args)
3696
#define netif_alert(priv, type, dev, fmt, args...)		\
3697
	netif_level(alert, priv, type, dev, fmt, ##args)
3698
#define netif_crit(priv, type, dev, fmt, args...)		\
3699
	netif_level(crit, priv, type, dev, fmt, ##args)
3700
#define netif_err(priv, type, dev, fmt, args...)		\
3701
	netif_level(err, priv, type, dev, fmt, ##args)
3702
#define netif_warn(priv, type, dev, fmt, args...)		\
3703
	netif_level(warn, priv, type, dev, fmt, ##args)
3704
#define netif_notice(priv, type, dev, fmt, args...)		\
3705
	netif_level(notice, priv, type, dev, fmt, ##args)
3706
#define netif_info(priv, type, dev, fmt, args...)		\
3707
	netif_level(info, priv, type, dev, fmt, ##args)
3708

3709
#if defined(CONFIG_DYNAMIC_DEBUG)
3710 3711 3712
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
3713
		dynamic_netdev_dbg(netdev, format, ##args);	\
3714
} while (0)
3715 3716 3717
#elif defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
3718 3719 3720 3721 3722 3723 3724 3725 3726 3727
#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)
3728
#define netif_vdbg	netif_dbg
3729 3730 3731 3732
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
3733
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
3734 3735 3736
	0;							\
})
#endif
3737

3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767
/*
 *	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)

3768
#endif	/* _LINUX_NETDEVICE_H */