netdevice.h 82.8 KB
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/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the Interfaces handler.
 *
 * Version:	@(#)dev.h	1.0.10	08/12/93
 *
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 * Authors:	Ross Biro
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 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Corey Minyard <wf-rch!minyard@relay.EU.net>
 *		Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
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 *		Alan Cox, <alan@lxorguk.ukuu.org.uk>
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 *		Bjorn Ekwall. <bj0rn@blox.se>
 *              Pekka Riikonen <priikone@poseidon.pspt.fi>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *		Moved to /usr/include/linux for NET3
 */
#ifndef _LINUX_NETDEVICE_H
#define _LINUX_NETDEVICE_H

#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
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#include <linux/if_link.h>
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#ifdef __KERNEL__
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#include <linux/pm_qos_params.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <asm/atomic.h>
#include <asm/cache.h>
#include <asm/byteorder.h>

#include <linux/device.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/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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struct vlan_group;
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struct netpoll_info;
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struct phy_device;
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/* 802.11 specific */
struct wireless_dev;
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					/* source back-compat hooks */
#define SET_ETHTOOL_OPS(netdev,ops) \
	( (netdev)->ethtool_ops = (ops) )

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/* hardware address assignment types */
#define NET_ADDR_PERM		0	/* address is permanent (default) */
#define NET_ADDR_RANDOM		1	/* address is generated randomly */
#define NET_ADDR_STOLEN		2	/* address is stolen from other device */

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/* 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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#endif

#define MAX_ADDR_LEN	32		/* Largest hardware address length */

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/* Initial net device group. All devices belong to group 0 by default. */
#define INIT_NETDEV_GROUP	0

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#ifdef  __KERNEL__
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/*
 *	Compute the worst case header length according to the protocols
 *	used.
 */
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#if defined(CONFIG_WLAN) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
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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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#elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
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# define LL_MAX_HEADER 48
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#else
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# define LL_MAX_HEADER 32
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#endif

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#if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
    !defined(CONFIG_NET_IPGRE) &&  !defined(CONFIG_NET_IPGRE_MODULE) && \
    !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
    !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
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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;
};

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#endif  /*  __KERNEL__  */

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/* Media selection options. */
enum {
        IF_PORT_UNKNOWN = 0,
        IF_PORT_10BASE2,
        IF_PORT_10BASET,
        IF_PORT_AUI,
        IF_PORT_100BASET,
        IF_PORT_100BASETX,
        IF_PORT_100BASEFX
};

#ifdef __KERNEL__

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

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
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	bool			synced;
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	bool			global_use;
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	int			refcount;
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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.
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 *
 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
 * may need.
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 */
#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)
#define LL_ALLOCATED_SPACE(dev) \
	((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(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,
			   const void *saddr, unsigned len);
	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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extern 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;
	int			(*poll)(struct napi_struct *, int);
#ifdef CONFIG_NETPOLL
	spinlock_t		poll_lock;
	int			poll_owner;
#endif
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	unsigned int		gro_count;

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	struct net_device	*dev;
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	struct list_head	dev_list;
	struct sk_buff		*gro_list;
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	struct sk_buff		*skb;
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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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};

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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
 * are registred on exact device (ptype->dev == skb->dev).
 *
 * 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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extern void __napi_schedule(struct napi_struct *n);
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static inline int napi_disable_pending(struct napi_struct *n)
{
	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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 */
static inline int napi_schedule_prep(struct napi_struct *n)
{
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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().  */
static inline int napi_reschedule(struct napi_struct *napi)
{
	if (napi_schedule_prep(napi)) {
		__napi_schedule(napi);
		return 1;
	}
	return 0;
}

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/**
 *	napi_complete - NAPI processing complete
 *	@n: napi context
 *
 * Mark NAPI processing as complete.
 */
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extern void __napi_complete(struct napi_struct *n);
extern void napi_complete(struct napi_struct *n);
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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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	set_bit(NAPI_STATE_DISABLE, &n->state);
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	while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
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		msleep(1);
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	clear_bit(NAPI_STATE_DISABLE, &n->state);
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}

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

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

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enum netdev_queue_state_t {
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	__QUEUE_STATE_XOFF,
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	__QUEUE_STATE_FROZEN,
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#define QUEUE_STATE_XOFF_OR_FROZEN ((1 << __QUEUE_STATE_XOFF)		| \
				    (1 << __QUEUE_STATE_FROZEN))
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};

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struct netdev_queue {
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/*
 * read mostly part
 */
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	struct net_device	*dev;
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	struct Qdisc		*qdisc;
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	unsigned long		state;
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	struct Qdisc		*qdisc_sleeping;
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#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
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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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} ____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];
};
#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;
585
	u16 filter;
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	unsigned int last_qtail;
};
588
#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 work_struct free_work;
	struct rps_dev_flow flows[0];
};
#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
    (_num * sizeof(struct rps_dev_flow)))

/*
 * 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) + \
    (_num * sizeof(u16)))

#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
extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
				u32 flow_id, u16 filter_id);
#endif

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

686 687
/*
 * This structure defines the management hooks for network devices.
688 689
 * 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.
 *
709 710
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
711
 *	Called when a packet needs to be transmitted.
712 713
 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
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 *	Required can not be NULL.
 *
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 *	Called to decide which queue to when device supports multiple
 *	transmit queues.
 *
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 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 *	This function is called to allow device receiver to make
 *	changes to configuration when multicast or promiscious is enabled.
 *
 * void (*ndo_set_rx_mode)(struct net_device *dev);
 *	This function is called device changes address list filtering.
 *
 * void (*ndo_set_multicast_list)(struct net_device *dev);
 *	This function is called when the multicast address list changes.
 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *	This function  is called when the Media Access Control address
732
 *	needs to be changed. If this interface is not defined, the
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
 *	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.
 *
753
 * void (*ndo_tx_timeout)(struct net_device *dev);
754 755 756
 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
757
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
758
 *                      struct rtnl_link_stats64 *storage);
759
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
760
 *	Called when a user wants to get the network device usage
761
 *	statistics. Drivers must do one of the following:
762 763
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
764
 *	2. Define @ndo_get_stats to update a net_device_stats structure
765 766 767 768 769
 *	   (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.
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 *
 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 *	If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *	this function is called when a VLAN id is registered.
 *
 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 *	If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *	this function is called when a VLAN id is unregistered.
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
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 *
 *	SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
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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.
795
 *
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 *	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.
 *
 * 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.
 *
832 833 834 835 836 837
 *	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.
838 839 840 841 842 843 844 845
 *
 *	Slave management functions (for bridge, bonding, etc). User should
 *	call netdev_set_master() to set dev->master properly.
 * 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.
846 847 848 849 850 851 852 853 854 855 856 857
 *
 *      Feature/offload setting functions.
 * u32 (*ndo_fix_features)(struct net_device *dev, u32 features);
 *	Adjusts the requested feature flags according to device-specific
 *	constraints, and returns the resulting flags. Must not modify
 *	the device state.
 *
 * int (*ndo_set_features)(struct net_device *dev, u32 features);
 *	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.
 *
858 859 860 861 862 863
 */
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);
864
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
865 866 867
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
868 869 870 871 872 873 874 875 876 877 878
	void			(*ndo_change_rx_flags)(struct net_device *dev,
						       int flags);
	void			(*ndo_set_rx_mode)(struct net_device *dev);
	void			(*ndo_set_multicast_list)(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);
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	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
883 884
	void			(*ndo_tx_timeout) (struct net_device *dev);

885 886
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
887 888 889 890 891 892 893 894
	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

	void			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
						       unsigned short vid);
	void			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
						        unsigned short vid);
#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,
						     struct netpoll_info *info);
897
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
898
#endif
899 900 901 902 903 904 905 906 907
	int			(*ndo_set_vf_mac)(struct net_device *dev,
						  int queue, u8 *mac);
	int			(*ndo_set_vf_vlan)(struct net_device *dev,
						   int queue, u16 vlan, u8 qos);
	int			(*ndo_set_vf_tx_rate)(struct net_device *dev,
						      int vf, int rate);
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
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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);
913
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
914
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
915 916
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
917 918 919 920 921 922
	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);
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	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
						       u16 xid,
						       struct scatterlist *sgl,
						       unsigned int sgc);
927 928 929 930
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
931
#endif
932 933 934 935 936 937
#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
938 939 940 941
	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);
942 943 944 945
	u32			(*ndo_fix_features)(struct net_device *dev,
						    u32 features);
	int			(*ndo_set_features)(struct net_device *dev,
						    u32 features);
946 947
};

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/*
 *	The DEVICE structure.
 *	Actually, this whole structure is a big mistake.  It mixes I/O
 *	data with strictly "high-level" data, and it has to know about
 *	almost every data structure used in the INET module.
 *
 *	FIXME: cleanup struct net_device such that network protocol info
 *	moves out.
 */

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struct net_device {
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	/*
	 * 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
963
	 * of the interface.
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	 */
	char			name[IFNAMSIZ];
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967
	struct pm_qos_request_list pm_qos_req;
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969 970
	/* device name hash chain */
	struct hlist_node	name_hlist;
971 972
	/* snmp alias */
	char 			*ifalias;
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	/*
	 *	I/O specific fields
	 *	FIXME: Merge these and struct ifmap into one
	 */
	unsigned long		mem_end;	/* shared mem end	*/
	unsigned long		mem_start;	/* shared mem start	*/
	unsigned long		base_addr;	/* device I/O address	*/
	unsigned int		irq;		/* device IRQ number	*/

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

	unsigned long		state;

990
	struct list_head	dev_list;
991
	struct list_head	napi_list;
992
	struct list_head	unreg_list;
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994
	/* currently active device features */
995
	u32			features;
996 997 998 999
	/* user-changeable features */
	u32			hw_features;
	/* user-requested features */
	u32			wanted_features;
1000
	/* mask of features inheritable by VLAN devices */
1001 1002
	u32			vlan_features;

1003 1004 1005
	/* Net device feature bits; if you change something,
	 * also update netdev_features_strings[] in ethtool.c */

1006
#define NETIF_F_SG		1	/* Scatter/gather IO. */
1007
#define NETIF_F_IP_CSUM		2	/* Can checksum TCP/UDP over IPv4. */
1008 1009
#define NETIF_F_NO_CSUM		4	/* Does not require checksum. F.e. loopack. */
#define NETIF_F_HW_CSUM		8	/* Can checksum all the packets. */
1010
#define NETIF_F_IPV6_CSUM	16	/* Can checksum TCP/UDP over IPV6 */
1011 1012 1013 1014 1015 1016
#define NETIF_F_HIGHDMA		32	/* Can DMA to high memory. */
#define NETIF_F_FRAGLIST	64	/* Scatter/gather IO. */
#define NETIF_F_HW_VLAN_TX	128	/* Transmit VLAN hw acceleration */
#define NETIF_F_HW_VLAN_RX	256	/* Receive VLAN hw acceleration */
#define NETIF_F_HW_VLAN_FILTER	512	/* Receive filtering on VLAN */
#define NETIF_F_VLAN_CHALLENGED	1024	/* Device cannot handle VLAN packets */
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#define NETIF_F_GSO		2048	/* Enable software GSO. */
1018 1019
#define NETIF_F_LLTX		4096	/* LockLess TX - deprecated. Please */
					/* do not use LLTX in new drivers */
1020
#define NETIF_F_NETNS_LOCAL	8192	/* Does not change network namespaces */
1021
#define NETIF_F_GRO		16384	/* Generic receive offload */
1022
#define NETIF_F_LRO		32768	/* large receive offload */
1023

1024
/* the GSO_MASK reserves bits 16 through 23 */
1025
#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
1026
#define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */
1027
#define NETIF_F_FCOE_MTU	(1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
1028
#define NETIF_F_NTUPLE		(1 << 27) /* N-tuple filters supported */
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#define NETIF_F_RXHASH		(1 << 28) /* Receive hashing offload */
1030
#define NETIF_F_RXCSUM		(1 << 29) /* Receive checksumming offload */
1031
#define NETIF_F_NOCACHE_COPY	(1 << 30) /* Use no-cache copyfromuser */
1032
#define NETIF_F_LOOPBACK	(1 << 31) /* Enable loopback */
1033

1034
	/* Segmentation offload features */
1035
#define NETIF_F_GSO_SHIFT	16
1036
#define NETIF_F_GSO_MASK	0x00ff0000
1037
#define NETIF_F_TSO		(SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
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#define NETIF_F_UFO		(SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
1039
#define NETIF_F_GSO_ROBUST	(SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
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#define NETIF_F_TSO_ECN		(SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
#define NETIF_F_TSO6		(SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
1042
#define NETIF_F_FSO		(SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
1043

1044 1045
	/* Features valid for ethtool to change */
	/* = all defined minus driver/device-class-related */
1046
#define NETIF_F_NEVER_CHANGE	(NETIF_F_VLAN_CHALLENGED | \
1047
				  NETIF_F_LLTX | NETIF_F_NETNS_LOCAL)
1048
#define NETIF_F_ETHTOOL_BITS	(0xff3fffff & ~NETIF_F_NEVER_CHANGE)
1049

1050
	/* List of features with software fallbacks. */
1051 1052
#define NETIF_F_GSO_SOFTWARE	(NETIF_F_TSO | NETIF_F_TSO_ECN | \
				 NETIF_F_TSO6 | NETIF_F_UFO)
1053

1054

1055
#define NETIF_F_GEN_CSUM	(NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
1056 1057 1058
#define NETIF_F_V4_CSUM		(NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
#define NETIF_F_V6_CSUM		(NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
#define NETIF_F_ALL_CSUM	(NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
1059

1060 1061
#define NETIF_F_ALL_TSO 	(NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN)

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1062 1063 1064
#define NETIF_F_ALL_FCOE	(NETIF_F_FCOE_CRC | NETIF_F_FCOE_MTU | \
				 NETIF_F_FSO)

1065 1066 1067 1068 1069
	/*
	 * If one device supports one of these features, then enable them
	 * for all in netdev_increment_features.
	 */
#define NETIF_F_ONE_FOR_ALL	(NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
1070
				 NETIF_F_SG | NETIF_F_HIGHDMA |		\
1071 1072 1073 1074 1075 1076
				 NETIF_F_FRAGLIST | NETIF_F_VLAN_CHALLENGED)
	/*
	 * If one device doesn't support one of these features, then disable it
	 * for all in netdev_increment_features.
	 */
#define NETIF_F_ALL_FOR_ALL	(NETIF_F_NOCACHE_COPY | NETIF_F_FSO)
1077

1078 1079 1080
	/* changeable features with no special hardware requirements */
#define NETIF_F_SOFT_FEATURES	(NETIF_F_GSO | NETIF_F_GRO)

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1081 1082 1083 1084
	/* Interface index. Unique device identifier	*/
	int			ifindex;
	int			iflink;

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1085
	struct net_device_stats	stats;
1086 1087 1088
	atomic_long_t		rx_dropped; /* dropped packets by core network
					     * Do not use this in drivers.
					     */
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1089

1090
#ifdef CONFIG_WIRELESS_EXT
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1091 1092 1093 1094 1095
	/* List of functions to handle Wireless Extensions (instead of ioctl).
	 * See <net/iw_handler.h> for details. Jean II */
	const struct iw_handler_def *	wireless_handlers;
	/* Instance data managed by the core of Wireless Extensions. */
	struct iw_public_data *	wireless_data;
1096
#endif
1097 1098
	/* Management operations */
	const struct net_device_ops *netdev_ops;
1099
	const struct ethtool_ops *ethtool_ops;
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1101 1102 1103
	/* Hardware header description */
	const struct header_ops *header_ops;

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1104
	unsigned int		flags;	/* interface flags (a la BSD)	*/
1105
	unsigned int		priv_flags; /* Like 'flags' but invisible to userspace. */
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1106 1107 1108
	unsigned short		gflags;
	unsigned short		padded;	/* How much padding added by alloc_netdev() */

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1109 1110 1111
	unsigned char		operstate; /* RFC2863 operstate */
	unsigned char		link_mode; /* mapping policy to operstate */

1112 1113 1114
	unsigned char		if_port;	/* Selectable AUI, TP,..*/
	unsigned char		dma;		/* DMA channel		*/

1115
	unsigned int		mtu;	/* interface MTU value		*/
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1116 1117 1118
	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

1119 1120 1121 1122 1123 1124 1125
	/* extra head- and tailroom the hardware may need, but not in all cases
	 * can this be guaranteed, especially tailroom. Some cases also use
	 * LL_MAX_HEADER instead to allocate the skb.
	 */
	unsigned short		needed_headroom;
	unsigned short		needed_tailroom;

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1126
	/* Interface address info. */
1127
	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
1128
	unsigned char		addr_assign_type; /* hw address assignment type */
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1129 1130 1131
	unsigned char		addr_len;	/* hardware address length	*/
	unsigned short          dev_id;		/* for shared network cards */

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1132
	spinlock_t		addr_list_lock;
1133 1134
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
1135
	bool			uc_promisc;
1136 1137
	unsigned int		promiscuity;
	unsigned int		allmulti;
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1138 1139 1140


	/* Protocol specific pointers */
1141 1142

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
E
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1143
	struct vlan_group __rcu	*vlgrp;		/* VLAN group */
1144
#endif
1145 1146 1147
#ifdef CONFIG_NET_DSA
	void			*dsa_ptr;	/* dsa specific data */
#endif
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1148
	void 			*atalk_ptr;	/* AppleTalk link 	*/
E
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1149
	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
1150
	struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
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1151
	struct inet6_dev __rcu	*ip6_ptr;       /* IPv6 specific data */
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1152 1153
	void			*ec_ptr;	/* Econet specific data	*/
	void			*ax25_ptr;	/* AX.25 specific data */
1154 1155
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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1156

1157
/*
E
Eric Dumazet 已提交
1158
 * Cache lines mostly used on receive path (including eth_type_trans())
1159
 */
1160 1161 1162 1163 1164 1165 1166 1167
	unsigned long		last_rx;	/* Time of last Rx
						 * This should not be set in
						 * drivers, unless really needed,
						 * because network stack (bonding)
						 * use it if/when necessary, to
						 * avoid dirtying this cache line.
						 */

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1168 1169 1170 1171
	struct net_device	*master; /* Pointer to master device of a group,
					  * which this device is member of.
					  */

1172
	/* Interface address info used in eth_type_trans() */
1173 1174 1175 1176
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

1177 1178
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						      hw addresses */
1179 1180

	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/
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1181

1182
#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
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1183 1184 1185 1186
	struct kset		*queues_kset;

	struct netdev_rx_queue	*_rx;

1187
	/* Number of RX queues allocated at register_netdev() time */
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1188
	unsigned int		num_rx_queues;
1189 1190 1191

	/* Number of RX queues currently active in device */
	unsigned int		real_num_rx_queues;
1192 1193 1194 1195 1196 1197 1198

#ifdef CONFIG_RFS_ACCEL
	/* CPU reverse-mapping for RX completion interrupts, indexed
	 * by RX queue number.  Assigned by driver.  This must only be
	 * set if the ndo_rx_flow_steer operation is defined. */
	struct cpu_rmap		*rx_cpu_rmap;
#endif
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1199
#endif
T
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1200

1201 1202
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1203

1204
	struct netdev_queue __rcu *ingress_queue;
E
Eric Dumazet 已提交
1205 1206 1207 1208

/*
 * Cache lines mostly used on transmit path
 */
1209
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
1210 1211

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
1212
	unsigned int		num_tx_queues;
1213 1214 1215 1216

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

1217 1218 1219
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

L
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1220
	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
1221
	spinlock_t		tx_global_lock;
E
Eric Dumazet 已提交
1222

T
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1223
#ifdef CONFIG_XPS
E
Eric Dumazet 已提交
1224
	struct xps_dev_maps __rcu *xps_maps;
T
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1225
#endif
T
Tom Herbert 已提交
1226

1227
	/* These may be needed for future network-power-down code. */
1228 1229 1230 1231 1232

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1233 1234 1235 1236 1237
	unsigned long		trans_start;	/* Time (in jiffies) of last Tx	*/

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

L
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1238
	/* Number of references to this device */
E
Eric Dumazet 已提交
1239
	int __percpu		*pcpu_refcnt;
1240

L
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1241 1242 1243 1244 1245
	/* delayed register/unregister */
	struct list_head	todo_list;
	/* device index hash chain */
	struct hlist_node	index_hlist;

1246
	struct list_head	link_watch_list;
1247

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1248 1249
	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1250
	       NETREG_REGISTERED,	/* completed register_netdevice */
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1251 1252 1253
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1254
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1255 1256 1257
	} reg_state:8;

	bool dismantle; /* device is going do be freed */
1258 1259 1260 1261 1262

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1263

1264 1265
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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1266 1267

#ifdef CONFIG_NETPOLL
1268
	struct netpoll_info	*npinfo;
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1269
#endif
1270

1271
#ifdef CONFIG_NET_NS
1272 1273
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1274
#endif
1275

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David S. Miller 已提交
1276
	/* mid-layer private */
E
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1277 1278 1279
	union {
		void				*ml_priv;
		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
1280
		struct pcpu_tstats __percpu	*tstats; /* tunnel stats */
1281
		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
E
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1282
	};
1283
	/* GARP */
E
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1284
	struct garp_port __rcu	*garp_port;
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1285 1286

	/* class/net/name entry */
1287
	struct device		dev;
1288 1289
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
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Patrick McHardy 已提交
1290 1291 1292

	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
1293

1294 1295 1296
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1297

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Jeff Kirsher 已提交
1298
#ifdef CONFIG_DCB
1299
	/* Data Center Bridging netlink ops */
1300
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1301
#endif
1302 1303 1304
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1305

1306 1307 1308 1309
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
#endif
1310 1311
	/* phy device may attach itself for hardware timestamping */
	struct phy_device *phydev;
1312 1313 1314

	/* group the device belongs to */
	int group;
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1315
};
1316
#define to_net_dev(d) container_of(d, struct net_device, dev)
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1317 1318 1319

#define	NETDEV_ALIGN		32

1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
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;
}

1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
					 unsigned int index)
{
	return &dev->_tx[index];
}

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

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

1390 1391 1392 1393 1394 1395
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
Eric Dumazet 已提交
1396
	return read_pnet(&dev->nd_net);
1397 1398 1399
}

static inline
1400
void dev_net_set(struct net_device *dev, struct net *net)
1401 1402
{
#ifdef CONFIG_NET_NS
1403 1404
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1405 1406 1407
#endif
}

1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
static inline bool netdev_uses_dsa_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_DSA
	if (dev->dsa_ptr != NULL)
		return dsa_uses_dsa_tags(dev->dsa_ptr);
#endif

	return 0;
}

1418 1419 1420 1421 1422 1423 1424 1425 1426
#ifndef CONFIG_NET_NS
static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
{
	skb->dev = dev;
}
#else /* CONFIG_NET_NS */
void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
#endif

1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
static inline bool netdev_uses_trailer_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_TRAILER
	if (dev->dsa_ptr != NULL)
		return dsa_uses_trailer_tags(dev->dsa_ptr);
#endif

	return 0;
}

1437 1438 1439 1440 1441 1442
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1443
static inline void *netdev_priv(const struct net_device *dev)
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1444
{
1445
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
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1446 1447 1448 1449 1450
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1451
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1453 1454 1455 1456 1457 1458
/* Set the sysfs device type for the network logical device to allow
 * fin grained indentification of different network device types. For
 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
 */
#define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))

1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
/**
 *	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.
 */
1469 1470
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1471

1472 1473 1474 1475 1476 1477
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1478 1479 1480
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1481 1482 1483
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1484 1485 1486
	/* Length of frag0. */
	unsigned int frag0_len;

1487 1488 1489
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1490 1491 1492 1493 1494 1495 1496 1497
	/* This is non-zero if the packet may be of the same flow. */
	int same_flow;

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

	/* Number of segments aggregated. */
	int count;
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Herbert Xu 已提交
1498 1499 1500

	/* Free the skb? */
	int free;
1501 1502 1503
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1504

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1505
struct packet_type {
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1506 1507 1508 1509 1510 1511
	__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 *);
1512
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
1513
						u32 features);
1514
	int			(*gso_send_check)(struct sk_buff *skb);
1515 1516 1517
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
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1518 1519 1520 1521 1522 1523 1524 1525
	void			*af_packet_priv;
	struct list_head	list;
};

#include <linux/notifier.h>

extern rwlock_t				dev_base_lock;		/* Device list lock */

1526

1527 1528
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1529 1530
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1531 1532
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1533 1534 1535 1536
#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)
1537 1538
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1539
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1540

1541 1542 1543 1544 1545
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1546
	net = dev_net(dev);
1547 1548 1549 1550
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1551 1552 1553 1554 1555 1556
static inline struct net_device *next_net_device_rcu(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

	net = dev_net(dev);
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Eric Dumazet 已提交
1557
	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
1558 1559 1560
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1561 1562 1563 1564 1565
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);
}
1566

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1567 1568 1569 1570 1571 1572 1573
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);
}

L
Linus Torvalds 已提交
1574 1575
extern int 			netdev_boot_setup_check(struct net_device *dev);
extern unsigned long		netdev_boot_base(const char *prefix, int unit);
1576 1577
extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
					      const char *hwaddr);
1578 1579
extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
L
Linus Torvalds 已提交
1580 1581 1582 1583
extern void		dev_add_pack(struct packet_type *pt);
extern void		dev_remove_pack(struct packet_type *pt);
extern void		__dev_remove_pack(struct packet_type *pt);

E
Eric Dumazet 已提交
1584 1585
extern struct net_device	*dev_get_by_flags_rcu(struct net *net, unsigned short flags,
						      unsigned short mask);
1586
extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
1587
extern struct net_device	*dev_get_by_name_rcu(struct net *net, const char *name);
1588
extern struct net_device	*__dev_get_by_name(struct net *net, const char *name);
L
Linus Torvalds 已提交
1589 1590 1591
extern int		dev_alloc_name(struct net_device *dev, const char *name);
extern int		dev_open(struct net_device *dev);
extern int		dev_close(struct net_device *dev);
1592
extern void		dev_disable_lro(struct net_device *dev);
L
Linus Torvalds 已提交
1593 1594
extern int		dev_queue_xmit(struct sk_buff *skb);
extern int		register_netdevice(struct net_device *dev);
1595 1596
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1597
extern void		unregister_netdevice_many(struct list_head *head);
1598 1599 1600 1601 1602
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

E
Eric Dumazet 已提交
1603
extern int 		netdev_refcnt_read(const struct net_device *dev);
L
Linus Torvalds 已提交
1604 1605 1606 1607
extern void		free_netdev(struct net_device *dev);
extern void		synchronize_net(void);
extern int 		register_netdevice_notifier(struct notifier_block *nb);
extern int		unregister_netdevice_notifier(struct notifier_block *nb);
1608
extern int		init_dummy_netdev(struct net_device *dev);
1609
extern void		netdev_resync_ops(struct net_device *dev);
1610

1611
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1612 1613
extern struct net_device	*dev_get_by_index(struct net *net, int ifindex);
extern struct net_device	*__dev_get_by_index(struct net *net, int ifindex);
1614
extern struct net_device	*dev_get_by_index_rcu(struct net *net, int ifindex);
L
Linus Torvalds 已提交
1615 1616 1617 1618
extern int		dev_restart(struct net_device *dev);
#ifdef CONFIG_NETPOLL_TRAP
extern int		netpoll_trap(void);
#endif
1619 1620
extern int	       skb_gro_receive(struct sk_buff **head,
				       struct sk_buff *skb);
1621
extern void	       skb_gro_reset_offset(struct sk_buff *skb);
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637

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;
}

1638 1639
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1640
{
1641 1642
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1643

1644 1645 1646 1647
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1648

1649 1650 1651 1652 1653 1654
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
	return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1655
}
L
Linus Torvalds 已提交
1656

1657 1658
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1659
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1660 1661
}

H
Herbert Xu 已提交
1662 1663
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1664 1665
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
Herbert Xu 已提交
1666 1667
}

1668 1669
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1670 1671
				  const void *daddr, const void *saddr,
				  unsigned len)
1672
{
1673
	if (!dev->header_ops || !dev->header_ops->create)
1674
		return 0;
1675 1676

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1677 1678
}

S
Stephen Hemminger 已提交
1679 1680 1681 1682 1683
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1684
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
1685
		return 0;
1686
	return dev->header_ops->parse(skb, haddr);
S
Stephen Hemminger 已提交
1687 1688
}

L
Linus Torvalds 已提交
1689 1690 1691 1692 1693 1694 1695 1696
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
extern int		register_gifconf(unsigned int family, gifconf_func_t * gifconf);
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

/*
E
Eric Dumazet 已提交
1697
 * Incoming packets are placed on per-cpu queues
L
Linus Torvalds 已提交
1698
 */
E
Eric Dumazet 已提交
1699
struct softnet_data {
1700
	struct Qdisc		*output_queue;
1701
	struct Qdisc		**output_queue_tailp;
L
Linus Torvalds 已提交
1702 1703
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
1704
	struct sk_buff_head	process_queue;
L
Linus Torvalds 已提交
1705

C
Changli Gao 已提交
1706
	/* stats */
1707 1708 1709 1710
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
C
Changli Gao 已提交
1711

1712
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
1713 1714 1715
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
T
Tom Herbert 已提交
1716
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
Eric Dumazet 已提交
1717 1718
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
Tom Herbert 已提交
1719
	unsigned int		input_queue_head;
1720
	unsigned int		input_queue_tail;
1721
#endif
C
Changli Gao 已提交
1722
	unsigned		dropped;
T
Tom Herbert 已提交
1723
	struct sk_buff_head	input_pkt_queue;
1724
	struct napi_struct	backlog;
L
Linus Torvalds 已提交
1725 1726
};

1727
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
1728 1729
{
#ifdef CONFIG_RPS
1730 1731 1732 1733 1734 1735 1736 1737 1738
	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
1739 1740 1741
#endif
}

T
Tom Herbert 已提交
1742
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
Linus Torvalds 已提交
1743

1744
extern void __netif_schedule(struct Qdisc *q);
L
Linus Torvalds 已提交
1745

1746
static inline void netif_schedule_queue(struct netdev_queue *txq)
L
Linus Torvalds 已提交
1747
{
1748
	if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1749
		__netif_schedule(txq->qdisc);
1750 1751
}

1752 1753 1754 1755 1756 1757 1758 1759
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));
}

1760 1761 1762 1763 1764
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
	clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1765 1766 1767 1768 1769 1770
/**
 *	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
1771 1772
static inline void netif_start_queue(struct net_device *dev)
{
1773
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1774 1775
}

1776 1777 1778 1779 1780 1781 1782 1783 1784 1785
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);
	}
}

1786
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
L
Linus Torvalds 已提交
1787 1788
{
#ifdef CONFIG_NETPOLL_TRAP
1789
	if (netpoll_trap()) {
1790
		netif_tx_start_queue(dev_queue);
L
Linus Torvalds 已提交
1791
		return;
1792
	}
L
Linus Torvalds 已提交
1793
#endif
1794
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1795
		__netif_schedule(dev_queue->qdisc);
1796 1797
}

1798 1799 1800 1801 1802 1803 1804
/**
 *	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.
 */
1805 1806
static inline void netif_wake_queue(struct net_device *dev)
{
1807
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1808 1809
}

1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
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);
	}
}

1820 1821
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
1822
	if (WARN_ON(!dev_queue)) {
1823
		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
1824 1825
		return;
	}
1826 1827 1828
	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1829 1830 1831 1832 1833 1834 1835
/**
 *	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
1836 1837
static inline void netif_stop_queue(struct net_device *dev)
{
1838
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1839 1840
}

1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
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);
	}
}

1851 1852 1853 1854 1855
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1856 1857 1858 1859 1860 1861
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
L
Linus Torvalds 已提交
1862 1863
static inline int netif_queue_stopped(const struct net_device *dev)
{
1864
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1865 1866
}

1867
static inline int netif_tx_queue_frozen_or_stopped(const struct netdev_queue *dev_queue)
1868
{
1869
	return dev_queue->state & QUEUE_STATE_XOFF_OR_FROZEN;
1870 1871
}

1872 1873 1874 1875 1876 1877
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
L
Linus Torvalds 已提交
1878 1879 1880 1881 1882
static inline int netif_running(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

1883 1884 1885 1886 1887 1888
/*
 * 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.
 */
1889 1890 1891 1892 1893 1894 1895 1896

/**
 *	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.
 */
1897 1898
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
1899
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1900 1901

	netif_tx_start_queue(txq);
1902 1903
}

1904 1905 1906 1907 1908 1909 1910
/**
 *	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.
 */
1911 1912
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
1913
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1914 1915 1916 1917
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1918
	netif_tx_stop_queue(txq);
1919 1920
}

1921 1922 1923 1924 1925 1926 1927
/**
 *	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.
 */
1928
static inline int __netif_subqueue_stopped(const struct net_device *dev,
1929 1930
					 u16 queue_index)
{
1931
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1932 1933

	return netif_tx_queue_stopped(txq);
1934 1935
}

1936 1937 1938 1939 1940
static inline int netif_subqueue_stopped(const struct net_device *dev,
					 struct sk_buff *skb)
{
	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
}
1941 1942 1943 1944 1945 1946 1947 1948

/**
 *	netif_wake_subqueue - allow sending packets on subqueue
 *	@dev: network device
 *	@queue_index: sub queue index
 *
 * Resume individual transmit queue of a device with multiple transmit queues.
 */
1949 1950
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
1951
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1952 1953 1954 1955
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1956
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1957
		__netif_schedule(txq->qdisc);
1958 1959
}

1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
/*
 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
 * as a distribution range limit for the returned value.
 */
static inline u16 skb_tx_hash(const struct net_device *dev,
			      const struct sk_buff *skb)
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

1970 1971 1972 1973 1974 1975
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
1976 1977
static inline int netif_is_multiqueue(const struct net_device *dev)
{
E
Eric Dumazet 已提交
1978
	return dev->num_tx_queues > 1;
1979
}
L
Linus Torvalds 已提交
1980

1981 1982
extern int netif_set_real_num_tx_queues(struct net_device *dev,
					unsigned int txq);
1983

1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994
#ifdef CONFIG_RPS
extern int netif_set_real_num_rx_queues(struct net_device *dev,
					unsigned int rxq);
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
static inline int netif_copy_real_num_queues(struct net_device *to_dev,
					     const struct net_device *from_dev)
{
	netif_set_real_num_tx_queues(to_dev, from_dev->real_num_tx_queues);
#ifdef CONFIG_RPS
	return netif_set_real_num_rx_queues(to_dev,
					    from_dev->real_num_rx_queues);
#else
	return 0;
#endif
}

L
Linus Torvalds 已提交
2007
/* Use this variant when it is known for sure that it
2008 2009
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
L
Linus Torvalds 已提交
2010
 */
2011
extern void dev_kfree_skb_irq(struct sk_buff *skb);
L
Linus Torvalds 已提交
2012 2013

/* Use this variant in places where it could be invoked
2014 2015
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
L
Linus Torvalds 已提交
2016
 */
2017
extern void dev_kfree_skb_any(struct sk_buff *skb);
L
Linus Torvalds 已提交
2018 2019 2020 2021

extern int		netif_rx(struct sk_buff *skb);
extern int		netif_rx_ni(struct sk_buff *skb);
extern int		netif_receive_skb(struct sk_buff *skb);
2022
extern gro_result_t	dev_gro_receive(struct napi_struct *napi,
2023
					struct sk_buff *skb);
2024 2025
extern gro_result_t	napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
extern gro_result_t	napi_gro_receive(struct napi_struct *napi,
2026
					 struct sk_buff *skb);
E
Eric Dumazet 已提交
2027
extern void		napi_gro_flush(struct napi_struct *napi);
2028
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
2029
extern gro_result_t	napi_frags_finish(struct napi_struct *napi,
2030 2031
					  struct sk_buff *skb,
					  gro_result_t ret);
2032
extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
2033
extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
2034 2035 2036 2037 2038 2039 2040

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

2041
extern int netdev_rx_handler_register(struct net_device *dev,
J
Jiri Pirko 已提交
2042 2043
				      rx_handler_func_t *rx_handler,
				      void *rx_handler_data);
2044 2045
extern void netdev_rx_handler_unregister(struct net_device *dev);

2046
extern int		dev_valid_name(const char *name);
2047 2048
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
L
Linus Torvalds 已提交
2049
extern unsigned		dev_get_flags(const struct net_device *);
2050
extern int		__dev_change_flags(struct net_device *, unsigned int flags);
L
Linus Torvalds 已提交
2051
extern int		dev_change_flags(struct net_device *, unsigned);
2052
extern void		__dev_notify_flags(struct net_device *, unsigned int old_flags);
2053
extern int		dev_change_name(struct net_device *, const char *);
2054
extern int		dev_set_alias(struct net_device *, const char *, size_t);
2055 2056
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
L
Linus Torvalds 已提交
2057
extern int		dev_set_mtu(struct net_device *, int);
2058
extern void		dev_set_group(struct net_device *, int);
L
Linus Torvalds 已提交
2059 2060
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
2061
extern int		dev_hard_start_xmit(struct sk_buff *skb,
2062 2063
					    struct net_device *dev,
					    struct netdev_queue *txq);
2064 2065
extern int		dev_forward_skb(struct net_device *dev,
					struct sk_buff *skb);
L
Linus Torvalds 已提交
2066

2067
extern int		netdev_budget;
L
Linus Torvalds 已提交
2068 2069 2070 2071

/* Called by rtnetlink.c:rtnl_unlock() */
extern void netdev_run_todo(void);

2072 2073 2074 2075
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
2076
 * Release reference to device to allow it to be freed.
2077
 */
L
Linus Torvalds 已提交
2078 2079
static inline void dev_put(struct net_device *dev)
{
E
Eric Dumazet 已提交
2080
	irqsafe_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
2081 2082
}

2083 2084 2085 2086
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
2087
 * Hold reference to device to keep it from being freed.
2088
 */
2089 2090
static inline void dev_hold(struct net_device *dev)
{
E
Eric Dumazet 已提交
2091
	irqsafe_cpu_inc(*dev->pcpu_refcnt);
2092
}
L
Linus Torvalds 已提交
2093 2094 2095 2096

/* 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
2097 2098 2099 2100
 *
 * 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.
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 */

extern void linkwatch_fire_event(struct net_device *dev);
2104
extern void linkwatch_forget_dev(struct net_device *dev);
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2106 2107 2108 2109 2110 2111
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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static inline int netif_carrier_ok(const struct net_device *dev)
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

2117 2118
extern unsigned long dev_trans_start(struct net_device *dev);

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extern void __netdev_watchdog_up(struct net_device *dev);

2121
extern void netif_carrier_on(struct net_device *dev);
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2122

2123
extern void netif_carrier_off(struct net_device *dev);
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2125 2126
extern void netif_notify_peers(struct net_device *dev);

2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
/**
 *	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.
 *
 */
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static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2146 2147 2148 2149 2150 2151
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
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2152 2153 2154 2155 2156 2157
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2158 2159 2160 2161 2162 2163
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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2164 2165 2166 2167 2168 2169
static inline int netif_dormant(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2170 2171 2172 2173 2174 2175
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
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static inline int netif_oper_up(const struct net_device *dev)
{
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2178 2179 2180 2181
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

2182 2183 2184 2185 2186 2187
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
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static inline int netif_device_present(struct net_device *dev)
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

2193
extern void netif_device_detach(struct net_device *dev);
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2194

2195
extern void netif_device_attach(struct net_device *dev);
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2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245

/*
 * 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;
}

2246
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
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2247
{
2248 2249
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
2250 2251
}

2252 2253 2254 2255 2256 2257
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
static inline int __netif_tx_trylock(struct netdev_queue *txq)
{
	int ok = spin_trylock(&txq->_xmit_lock);
	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);
}

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static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

2284 2285 2286 2287 2288 2289
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
2290 2291
static inline void netif_tx_lock(struct net_device *dev)
{
2292
	unsigned int i;
2293
	int cpu;
2294

2295 2296
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
2297 2298
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2299 2300 2301 2302 2303 2304 2305

		/* 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.
		 */
2306
		__netif_tx_lock(txq, cpu);
2307 2308
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
2309
	}
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}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
2314 2315
	local_bh_disable();
	netif_tx_lock(dev);
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2316 2317 2318 2319
}

static inline void netif_tx_unlock(struct net_device *dev)
{
2320 2321 2322 2323
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2324

2325 2326 2327 2328 2329
		/* 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);
2330
		netif_schedule_queue(txq);
2331 2332
	}
	spin_unlock(&dev->tx_global_lock);
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2333 2334 2335 2336
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2337 2338
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
2339 2340
}

2341
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2342
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2343
		__netif_tx_lock(txq, cpu);		\
2344 2345 2346
	}						\
}

2347
#define HARD_TX_UNLOCK(dev, txq) {			\
2348
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2349
		__netif_tx_unlock(txq);			\
2350 2351 2352
	}						\
}

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2353 2354
static inline void netif_tx_disable(struct net_device *dev)
{
2355
	unsigned int i;
2356
	int cpu;
2357

2358 2359
	local_bh_disable();
	cpu = smp_processor_id();
2360 2361
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2362 2363

		__netif_tx_lock(txq, cpu);
2364
		netif_tx_stop_queue(txq);
2365
		__netif_tx_unlock(txq);
2366
	}
2367
	local_bh_enable();
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}

2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389
static inline void netif_addr_lock(struct net_device *dev)
{
	spin_lock(&dev->addr_list_lock);
}

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);
}

2390
/*
2391
 * dev_addrs walker. Should be used only for read access. Call with
2392 2393 2394
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2395
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2396

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/* These functions live elsewhere (drivers/net/net_init.c, but related) */

extern void		ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
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Tom Herbert 已提交
2402
extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2403
				       void (*setup)(struct net_device *),
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2404
				       unsigned int txqs, unsigned int rxqs);
2405
#define alloc_netdev(sizeof_priv, name, setup) \
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2406 2407 2408 2409 2410
	alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)

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

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extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
2413

2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
/* General hardware address lists handling functions */
extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
				  struct netdev_hw_addr_list *from_list,
				  int addr_len, unsigned char addr_type);
extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
				   struct netdev_hw_addr_list *from_list,
				   int addr_len, unsigned char addr_type);
extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
			  struct netdev_hw_addr_list *from_list,
			  int addr_len);
extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
			     struct netdev_hw_addr_list *from_list,
			     int addr_len);
extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
extern void __hw_addr_init(struct netdev_hw_addr_list *list);

2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440
/* Functions used for device addresses handling */
extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
			unsigned char addr_type);
extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
			unsigned char addr_type);
extern int dev_addr_add_multiple(struct net_device *to_dev,
				 struct net_device *from_dev,
				 unsigned char addr_type);
extern int dev_addr_del_multiple(struct net_device *to_dev,
				 struct net_device *from_dev,
				 unsigned char addr_type);
2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
extern void dev_addr_flush(struct net_device *dev);
extern int dev_addr_init(struct net_device *dev);

/* Functions used for unicast addresses handling */
extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
extern int dev_uc_sync(struct net_device *to, struct net_device *from);
extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
extern void dev_uc_flush(struct net_device *dev);
extern void dev_uc_init(struct net_device *dev);
2451

2452 2453 2454 2455 2456 2457 2458 2459 2460
/* Functions used for multicast addresses handling */
extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
extern int dev_mc_sync(struct net_device *to, struct net_device *from);
extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
extern void dev_mc_flush(struct net_device *dev);
extern void dev_mc_init(struct net_device *dev);
2461

2462 2463 2464
/* Functions used for secondary unicast and multicast support */
extern void		dev_set_rx_mode(struct net_device *dev);
extern void		__dev_set_rx_mode(struct net_device *dev);
2465 2466
extern int		dev_set_promiscuity(struct net_device *dev, int inc);
extern int		dev_set_allmulti(struct net_device *dev, int inc);
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2467
extern void		netdev_state_change(struct net_device *dev);
2468
extern int		netdev_bonding_change(struct net_device *dev,
2469
					      unsigned long event);
2470
extern void		netdev_features_change(struct net_device *dev);
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2471
/* Load a device via the kmod */
2472
extern void		dev_load(struct net *net, const char *name);
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2473
extern void		dev_mcast_init(void);
2474 2475
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					       struct rtnl_link_stats64 *storage);
2476

L
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2477
extern int		netdev_max_backlog;
E
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2478
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
2479
extern int		weight_p;
2480
extern int		bpf_jit_enable;
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2481
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
J
Jiri Pirko 已提交
2482 2483
extern int netdev_set_bond_master(struct net_device *dev,
				  struct net_device *master);
2484
extern int skb_checksum_help(struct sk_buff *skb);
2485
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features);
2486 2487 2488 2489 2490 2491 2492
#ifdef CONFIG_BUG
extern void netdev_rx_csum_fault(struct net_device *dev);
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
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/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

2497 2498 2499 2500 2501 2502
#ifdef CONFIG_PROC_FS
extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
extern void dev_seq_stop(struct seq_file *seq, void *v);
#endif

2503 2504 2505
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

2506 2507
extern struct kobj_ns_type_operations net_ns_type_operations;

2508
extern const char *netdev_drivername(const struct net_device *dev);
2509

2510 2511
extern void linkwatch_run_queue(void);

2512 2513 2514 2515
static inline u32 netdev_get_wanted_features(struct net_device *dev)
{
	return (dev->features & ~dev->hw_features) | dev->wanted_features;
}
2516
u32 netdev_increment_features(u32 all, u32 one, u32 mask);
2517
int __netdev_update_features(struct net_device *dev);
2518
void netdev_update_features(struct net_device *dev);
2519
void netdev_change_features(struct net_device *dev);
2520

2521 2522 2523
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

2524
u32 netif_skb_features(struct sk_buff *skb);
2525

2526
static inline int net_gso_ok(u32 features, int gso_type)
2527
{
2528
	int feature = gso_type << NETIF_F_GSO_SHIFT;
2529
	return (features & feature) == feature;
2530 2531
}

2532
static inline int skb_gso_ok(struct sk_buff *skb, u32 features)
2533
{
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Herbert Xu 已提交
2534
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2535
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2536 2537
}

2538
static inline int netif_needs_gso(struct sk_buff *skb, int features)
2539
{
2540 2541
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2542 2543
}

2544 2545 2546 2547 2548 2549
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

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2550 2551 2552 2553 2554
static inline int netif_is_bond_slave(struct net_device *dev)
{
	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

2555
extern struct pernet_operations __net_initdata loopback_net_ops;
2556

2557 2558
int dev_ethtool_get_settings(struct net_device *dev,
			     struct ethtool_cmd *cmd);
2559 2560 2561

static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
{
2562 2563
	if (dev->features & NETIF_F_RXCSUM)
		return 1;
2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574
	if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
		return 0;
	return dev->ethtool_ops->get_rx_csum(dev);
}

static inline u32 dev_ethtool_get_flags(struct net_device *dev)
{
	if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
		return 0;
	return dev->ethtool_ops->get_flags(dev);
}
2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586

/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

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

2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603
extern int netdev_printk(const char *level, const struct net_device *dev,
			 const char *format, ...)
	__attribute__ ((format (printf, 3, 4)));
extern int netdev_emerg(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_alert(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_crit(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_err(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_warn(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_notice(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_info(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
2604

2605 2606 2607
#define MODULE_ALIAS_NETDEV(device) \
	MODULE_ALIAS("netdev-" device)

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#if defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
#elif defined(CONFIG_DYNAMIC_DEBUG)
#define netdev_dbg(__dev, format, args...)			\
do {								\
	dynamic_dev_dbg((__dev)->dev.parent, "%s: " format,	\
			netdev_name(__dev), ##args);		\
} while (0)
#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...)			\
	WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);

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/* 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)

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#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

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#define netif_emerg(priv, type, dev, fmt, args...)		\
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	netif_level(emerg, priv, type, dev, fmt, ##args)
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#define netif_alert(priv, type, dev, fmt, args...)		\
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	netif_level(alert, priv, type, dev, fmt, ##args)
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#define netif_crit(priv, type, dev, fmt, args...)		\
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	netif_level(crit, priv, type, dev, fmt, ##args)
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#define netif_err(priv, type, dev, fmt, args...)		\
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	netif_level(err, priv, type, dev, fmt, ##args)
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#define netif_warn(priv, type, dev, fmt, args...)		\
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	netif_level(warn, priv, type, dev, fmt, ##args)
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#define netif_notice(priv, type, dev, fmt, args...)		\
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	netif_level(notice, priv, type, dev, fmt, ##args)
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#define netif_info(priv, type, dev, fmt, args...)		\
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	netif_level(info, priv, type, dev, fmt, ##args)
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#if defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
#elif defined(CONFIG_DYNAMIC_DEBUG)
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
		dynamic_dev_dbg((netdev)->dev.parent,		\
				"%s: " format,			\
				netdev_name(netdev), ##args);	\
} while (0)
#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)
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#define netif_vdbg	netif_dbg
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#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
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		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
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	0;							\
})
#endif
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Linus Torvalds 已提交
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#endif /* __KERNEL__ */

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#endif	/* _LINUX_NETDEVICE_H */