drivers/net/xen-netback/common.h - linux - Git at Google

 /*
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version 2
  * as published by the Free Software Foundation; or, when distributed
  * separately from the Linux kernel or incorporated into other
  * software packages, subject to the following license:
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this source file (the "Software"), to deal in the Software without
  * restriction, including without limitation the rights to use, copy, modify,
  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  * and to permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  */

 #ifndef __XEN_NETBACK__COMMON_H__
 #define __XEN_NETBACK__COMMON_H__

 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/ip.h>
 #include <linux/in.h>
 #include <linux/io.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/wait.h>
 #include <linux/sched.h>

 #include <xen/interface/io/netif.h>
 #include <xen/interface/grant_table.h>
 #include <xen/grant_table.h>
 #include <xen/xenbus.h>
 #include <xen/page.h>
 #include <linux/debugfs.h>

 typedef unsigned int pending_ring_idx_t;

 struct pending_tx_info {
 	struct xen_netif_tx_request req; /* tx request */
 	unsigned int extra_count;
 	/* Callback data for released SKBs. The callback is always
 	 * xenvif_zerocopy_callback, desc contains the pending_idx, which is
 	 * also an index in pending_tx_info array. It is initialized in
 	 * xenvif_alloc and it never changes.
 	 * skb_shinfo(skb)->destructor_arg points to the first mapped slot's
 	 * callback_struct in this array of struct pending_tx_info's, then ctx
 	 * to the next, or NULL if there is no more slot for this skb.
 	 * ubuf_to_vif is a helper which finds the struct xenvif from a pointer
 	 * to this field.
 	 */
 	struct ubuf_info_msgzc callback_struct;
 };

 #define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE)
 #define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE)

 struct xenvif_rx_meta {
 	int id;
 	int size;
 	int gso_type;
 	int gso_size;
 };

 #define GSO_BIT(type) \
 	(1 << XEN_NETIF_GSO_TYPE_ ## type)

 /* Discriminate from any valid pending_idx value. */
 #define INVALID_PENDING_IDX 0xFFFF

 #define MAX_PENDING_REQS XEN_NETIF_TX_RING_SIZE

 /* The maximum number of frags is derived from the size of a grant (same
  * as a Xen page size for now).
  */
 #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)

 #define NETBACK_INVALID_HANDLE -1

 /* To avoid confusion, we define XEN_NETBK_LEGACY_SLOTS_MAX indicating
  * the maximum slots a valid packet can use. Now this value is defined
  * to be XEN_NETIF_NR_SLOTS_MIN, which is supposed to be supported by
  * all backend.
  */
 #define XEN_NETBK_LEGACY_SLOTS_MAX XEN_NETIF_NR_SLOTS_MIN

 /* Queue name is interface name with "-qNNN" appended */
 #define QUEUE_NAME_SIZE (IFNAMSIZ + 5)

 /* IRQ name is queue name with "-tx" or "-rx" appended */
 #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)

 struct xenvif;

 struct xenvif_stats {
 	/* Stats fields to be updated per-queue.
 	 * A subset of struct net_device_stats that contains only the
 	 * fields that are updated in netback.c for each queue.
 	 */
 	u64 rx_bytes;
 	u64 rx_packets;
 	u64 tx_bytes;
 	u64 tx_packets;

 	/* Additional stats used by xenvif */
 	unsigned long rx_gso_checksum_fixup;
 	unsigned long tx_zerocopy_sent;
 	unsigned long tx_zerocopy_success;
 	unsigned long tx_zerocopy_fail;
 	unsigned long tx_frag_overflow;
 };

 #define COPY_BATCH_SIZE 64

 struct xenvif_copy_state {
 	struct gnttab_copy op[COPY_BATCH_SIZE];
 	RING_IDX idx[COPY_BATCH_SIZE];
 	unsigned int num;
 	struct sk_buff_head *completed;
 };

 struct xenvif_queue { /* Per-queue data for xenvif */
 	unsigned int id; /* Queue ID, 0-based */
 	char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
 	struct xenvif *vif; /* Parent VIF */

 	/*
 	 * TX/RX common EOI handling.
 	 * When feature-split-event-channels = 0, interrupt handler sets
 	 * NETBK_COMMON_EOI, otherwise NETBK_RX_EOI and NETBK_TX_EOI are set
 	 * by the RX and TX interrupt handlers.
 	 * RX and TX handler threads will issue an EOI when either
 	 * NETBK_COMMON_EOI or their specific bits (NETBK_RX_EOI or
 	 * NETBK_TX_EOI) are set and they will reset those bits.
 	 */
 	atomic_t eoi_pending;
 #define NETBK_RX_EOI		0x01
 #define NETBK_TX_EOI		0x02
 #define NETBK_COMMON_EOI	0x04

 	/* Use NAPI for guest TX */
 	struct napi_struct napi;
 	/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
 	unsigned int tx_irq;
 	/* Only used when feature-split-event-channels = 1 */
 	char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
 	struct xen_netif_tx_back_ring tx;
 	struct sk_buff_head tx_queue;
 	struct page *mmap_pages[MAX_PENDING_REQS];
 	pending_ring_idx_t pending_prod;
 	pending_ring_idx_t pending_cons;
 	u16 pending_ring[MAX_PENDING_REQS];
 	struct pending_tx_info pending_tx_info[MAX_PENDING_REQS];
 	grant_handle_t grant_tx_handle[MAX_PENDING_REQS];

 	struct gnttab_copy tx_copy_ops[MAX_PENDING_REQS];
 	struct gnttab_map_grant_ref tx_map_ops[MAX_PENDING_REQS];
 	struct gnttab_unmap_grant_ref tx_unmap_ops[MAX_PENDING_REQS];
 	/* passed to gnttab_[un]map_refs with pages under (un)mapping */
 	struct page *pages_to_map[MAX_PENDING_REQS];
 	struct page *pages_to_unmap[MAX_PENDING_REQS];

 	/* This prevents zerocopy callbacks  to race over dealloc_ring */
 	spinlock_t callback_lock;
 	/* This prevents dealloc thread and NAPI instance to race over response
 	 * creation and pending_ring in xenvif_idx_release. In xenvif_tx_err
 	 * it only protect response creation
 	 */
 	spinlock_t response_lock;
 	pending_ring_idx_t dealloc_prod;
 	pending_ring_idx_t dealloc_cons;
 	u16 dealloc_ring[MAX_PENDING_REQS];
 	struct task_struct *dealloc_task;
 	wait_queue_head_t dealloc_wq;
 	atomic_t inflight_packets;

 	/* Use kthread for guest RX */
 	struct task_struct *task;
 	wait_queue_head_t wq;
 	/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
 	unsigned int rx_irq;
 	/* Only used when feature-split-event-channels = 1 */
 	char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
 	struct xen_netif_rx_back_ring rx;
 	struct sk_buff_head rx_queue;

 	unsigned int rx_queue_max;
 	unsigned int rx_queue_len;
 	unsigned long last_rx_time;
 	unsigned int rx_slots_needed;
 	bool stalled;

 	struct xenvif_copy_state rx_copy;

 	/* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
 	unsigned long   credit_bytes;
 	unsigned long   credit_usec;
 	unsigned long   remaining_credit;
 	struct timer_list credit_timeout;
 	u64 credit_window_start;
 	bool rate_limited;

 	/* Statistics */
 	struct xenvif_stats stats;
 };

 enum state_bit_shift {
 	/* This bit marks that the vif is connected */
 	VIF_STATUS_CONNECTED,
 };

 struct xenvif_mcast_addr {
 	struct list_head entry;
 	struct rcu_head rcu;
 	u8 addr[6];
 };

 #define XEN_NETBK_MCAST_MAX 64

 #define XEN_NETBK_MAX_HASH_KEY_SIZE 40
 #define XEN_NETBK_MAX_HASH_MAPPING_SIZE 128
 #define XEN_NETBK_HASH_TAG_SIZE 40

 struct xenvif_hash_cache_entry {
 	struct list_head link;
 	struct rcu_head rcu;
 	u8 tag[XEN_NETBK_HASH_TAG_SIZE];
 	unsigned int len;
 	u32 val;
 	int seq;
 };

 struct xenvif_hash_cache {
 	spinlock_t lock;
 	struct list_head list;
 	unsigned int count;
 	atomic_t seq;
 };

 struct xenvif_hash {
 	unsigned int alg;
 	u32 flags;
 	bool mapping_sel;
 	u8 key[XEN_NETBK_MAX_HASH_KEY_SIZE];
 	u32 mapping[2][XEN_NETBK_MAX_HASH_MAPPING_SIZE];
 	unsigned int size;
 	struct xenvif_hash_cache cache;
 };

 struct backend_info {
 	struct xenbus_device *dev;
 	struct xenvif *vif;

 	/* This is the state that will be reflected in xenstore when any
 	 * active hotplug script completes.
 	 */
 	enum xenbus_state state;

 	enum xenbus_state frontend_state;
 	struct xenbus_watch hotplug_status_watch;
 	u8 have_hotplug_status_watch:1;

 	const char *hotplug_script;
 };

 struct xenvif {
 	/* Unique identifier for this interface. */
 	domid_t          domid;
 	unsigned int     handle;

 	u8               fe_dev_addr[6];
 	struct list_head fe_mcast_addr;
 	unsigned int     fe_mcast_count;

 	/* Frontend feature information. */
 	int gso_mask;

 	u8 can_sg:1;
 	u8 ip_csum:1;
 	u8 ipv6_csum:1;
 	u8 multicast_control:1;

 	/* headroom requested by xen-netfront */
 	u16 xdp_headroom;

 	/* Is this interface disabled? True when backend discovers
 	 * frontend is rogue.
 	 */
 	bool disabled;
 	unsigned long status;
 	unsigned long drain_timeout;
 	unsigned long stall_timeout;

 	/* Queues */
 	struct xenvif_queue *queues;
 	unsigned int num_queues; /* active queues, resource allocated */
 	unsigned int stalled_queues;

 	struct xenvif_hash hash;

 	struct xenbus_watch credit_watch;
 	struct xenbus_watch mcast_ctrl_watch;

 	struct backend_info *be;

 	spinlock_t lock;

 #ifdef CONFIG_DEBUG_FS
 	struct dentry *xenvif_dbg_root;
 #endif

 	struct xen_netif_ctrl_back_ring ctrl;
 	unsigned int ctrl_irq;

 	/* Miscellaneous private stuff. */
 	struct net_device *dev;
 };

 struct xenvif_rx_cb {
 	unsigned long expires;
 	int meta_slots_used;
 };

 #define XENVIF_RX_CB(skb) ((struct xenvif_rx_cb *)(skb)->cb)

 static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif)
 {
 	return to_xenbus_device(vif->dev->dev.parent);
 }

 void xenvif_tx_credit_callback(struct timer_list *t);

 struct xenvif *xenvif_alloc(struct device *parent,
 			    domid_t domid,
 			    unsigned int handle);

 int xenvif_init_queue(struct xenvif_queue *queue);
 void xenvif_deinit_queue(struct xenvif_queue *queue);

 int xenvif_connect_data(struct xenvif_queue *queue,
 			unsigned long tx_ring_ref,
 			unsigned long rx_ring_ref,
 			unsigned int tx_evtchn,
 			unsigned int rx_evtchn);
 void xenvif_disconnect_data(struct xenvif *vif);
 int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
 			unsigned int evtchn);
 void xenvif_disconnect_ctrl(struct xenvif *vif);
 void xenvif_free(struct xenvif *vif);

 int xenvif_xenbus_init(void);
 void xenvif_xenbus_fini(void);

 /* (Un)Map communication rings. */
 void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue);
 int xenvif_map_frontend_data_rings(struct xenvif_queue *queue,
 				   grant_ref_t tx_ring_ref,
 				   grant_ref_t rx_ring_ref);

 /* Check for SKBs from frontend and schedule backend processing */
 void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue);

 /* Prevent the device from generating any further traffic. */
 void xenvif_carrier_off(struct xenvif *vif);

 int xenvif_tx_action(struct xenvif_queue *queue, int budget);

 int xenvif_kthread_guest_rx(void *data);
 void xenvif_kick_thread(struct xenvif_queue *queue);

 int xenvif_dealloc_kthread(void *data);

 irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data);

 bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread);
 void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb);

 void xenvif_carrier_on(struct xenvif *vif);

 /* Callback from stack when TX packet can be released */
 void xenvif_zerocopy_callback(struct sk_buff *skb, struct ubuf_info *ubuf,
 			      bool zerocopy_success);

 static inline pending_ring_idx_t nr_pending_reqs(struct xenvif_queue *queue)
 {
 	return MAX_PENDING_REQS -
 		queue->pending_prod + queue->pending_cons;
 }

 irqreturn_t xenvif_interrupt(int irq, void *dev_id);

 extern bool separate_tx_rx_irq;
 extern bool provides_xdp_headroom;

 extern unsigned int rx_drain_timeout_msecs;
 extern unsigned int rx_stall_timeout_msecs;
 extern unsigned int xenvif_max_queues;
 extern unsigned int xenvif_hash_cache_size;

 #ifdef CONFIG_DEBUG_FS
 extern struct dentry *xen_netback_dbg_root;
 #endif

 void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
 				 struct sk_buff *skb);
 void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue);

 /* Multicast control */
 bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr);
 void xenvif_mcast_addr_list_free(struct xenvif *vif);

 /* Hash */
 void xenvif_init_hash(struct xenvif *vif);
 void xenvif_deinit_hash(struct xenvif *vif);

 u32 xenvif_set_hash_alg(struct xenvif *vif, u32 alg);
 u32 xenvif_get_hash_flags(struct xenvif *vif, u32 *flags);
 u32 xenvif_set_hash_flags(struct xenvif *vif, u32 flags);
 u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 len);
 u32 xenvif_set_hash_mapping_size(struct xenvif *vif, u32 size);
 u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
 			    u32 off);

 void xenvif_set_skb_hash(struct xenvif *vif, struct sk_buff *skb);

 #ifdef CONFIG_DEBUG_FS
 void xenvif_dump_hash_info(struct xenvif *vif, struct seq_file *m);
 #endif

 #endif /* __XEN_NETBACK__COMMON_H__ */
	/*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License version 2
	* as published by the Free Software Foundation; or, when distributed
	* separately from the Linux kernel or incorporated into other
	* software packages, subject to the following license:
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this source file (the "Software"), to deal in the Software without
	* restriction, including without limitation the rights to use, copy, modify,
	* merge, publish, distribute, sublicense, and/or sell copies of the Software,
	* and to permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	* IN THE SOFTWARE.
	*/

	#ifndef __XEN_NETBACK__COMMON_H__
	#define __XEN_NETBACK__COMMON_H__

	#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/ip.h>
	#include <linux/in.h>
	#include <linux/io.h>
	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/wait.h>
	#include <linux/sched.h>

	#include <xen/interface/io/netif.h>
	#include <xen/interface/grant_table.h>
	#include <xen/grant_table.h>
	#include <xen/xenbus.h>
	#include <xen/page.h>
	#include <linux/debugfs.h>

	typedef unsigned int pending_ring_idx_t;

	struct pending_tx_info {
	struct xen_netif_tx_request req; /* tx request */
	unsigned int extra_count;
	/* Callback data for released SKBs. The callback is always
	* xenvif_zerocopy_callback, desc contains the pending_idx, which is
	* also an index in pending_tx_info array. It is initialized in
	* xenvif_alloc and it never changes.
	* skb_shinfo(skb)->destructor_arg points to the first mapped slot's
	* callback_struct in this array of struct pending_tx_info's, then ctx
	* to the next, or NULL if there is no more slot for this skb.
	* ubuf_to_vif is a helper which finds the struct xenvif from a pointer
	* to this field.
	*/
	struct ubuf_info_msgzc callback_struct;
	};

	#define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE)
	#define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE)

	struct xenvif_rx_meta {
	int id;
	int size;
	int gso_type;
	int gso_size;
	};

	#define GSO_BIT(type) \
	(1 << XEN_NETIF_GSO_TYPE_ ## type)

	/* Discriminate from any valid pending_idx value. */
	#define INVALID_PENDING_IDX 0xFFFF

	#define MAX_PENDING_REQS XEN_NETIF_TX_RING_SIZE

	/* The maximum number of frags is derived from the size of a grant (same
	* as a Xen page size for now).
	*/
	#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)

	#define NETBACK_INVALID_HANDLE -1

	/* To avoid confusion, we define XEN_NETBK_LEGACY_SLOTS_MAX indicating
	* the maximum slots a valid packet can use. Now this value is defined
	* to be XEN_NETIF_NR_SLOTS_MIN, which is supposed to be supported by
	* all backend.
	*/
	#define XEN_NETBK_LEGACY_SLOTS_MAX XEN_NETIF_NR_SLOTS_MIN

	/* Queue name is interface name with "-qNNN" appended */
	#define QUEUE_NAME_SIZE (IFNAMSIZ + 5)

	/* IRQ name is queue name with "-tx" or "-rx" appended */
	#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)

	struct xenvif;

	struct xenvif_stats {
	/* Stats fields to be updated per-queue.
	* A subset of struct net_device_stats that contains only the
	* fields that are updated in netback.c for each queue.
	*/
	u64 rx_bytes;
	u64 rx_packets;
	u64 tx_bytes;
	u64 tx_packets;

	/* Additional stats used by xenvif */
	unsigned long rx_gso_checksum_fixup;
	unsigned long tx_zerocopy_sent;
	unsigned long tx_zerocopy_success;
	unsigned long tx_zerocopy_fail;
	unsigned long tx_frag_overflow;
	};

	#define COPY_BATCH_SIZE 64

	struct xenvif_copy_state {
	struct gnttab_copy op[COPY_BATCH_SIZE];
	RING_IDX idx[COPY_BATCH_SIZE];
	unsigned int num;
	struct sk_buff_head *completed;
	};

	struct xenvif_queue { /* Per-queue data for xenvif */
	unsigned int id; /* Queue ID, 0-based */
	char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
	struct xenvif vif; / Parent VIF */

	/*
	* TX/RX common EOI handling.
	* When feature-split-event-channels = 0, interrupt handler sets
	* NETBK_COMMON_EOI, otherwise NETBK_RX_EOI and NETBK_TX_EOI are set
	* by the RX and TX interrupt handlers.
	* RX and TX handler threads will issue an EOI when either
	* NETBK_COMMON_EOI or their specific bits (NETBK_RX_EOI or
	* NETBK_TX_EOI) are set and they will reset those bits.
	*/
	atomic_t eoi_pending;
	#define NETBK_RX_EOI 0x01
	#define NETBK_TX_EOI 0x02
	#define NETBK_COMMON_EOI 0x04

	/* Use NAPI for guest TX */
	struct napi_struct napi;
	/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
	unsigned int tx_irq;
	/* Only used when feature-split-event-channels = 1 */
	char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
	struct xen_netif_tx_back_ring tx;
	struct sk_buff_head tx_queue;
	struct page *mmap_pages[MAX_PENDING_REQS];
	pending_ring_idx_t pending_prod;
	pending_ring_idx_t pending_cons;
	u16 pending_ring[MAX_PENDING_REQS];
	struct pending_tx_info pending_tx_info[MAX_PENDING_REQS];
	grant_handle_t grant_tx_handle[MAX_PENDING_REQS];

	struct gnttab_copy tx_copy_ops[MAX_PENDING_REQS];
	struct gnttab_map_grant_ref tx_map_ops[MAX_PENDING_REQS];
	struct gnttab_unmap_grant_ref tx_unmap_ops[MAX_PENDING_REQS];
	/* passed to gnttab_[un]map_refs with pages under (un)mapping */
	struct page *pages_to_map[MAX_PENDING_REQS];
	struct page *pages_to_unmap[MAX_PENDING_REQS];

	/* This prevents zerocopy callbacks to race over dealloc_ring */
	spinlock_t callback_lock;
	/* This prevents dealloc thread and NAPI instance to race over response
	* creation and pending_ring in xenvif_idx_release. In xenvif_tx_err
	* it only protect response creation
	*/
	spinlock_t response_lock;
	pending_ring_idx_t dealloc_prod;
	pending_ring_idx_t dealloc_cons;
	u16 dealloc_ring[MAX_PENDING_REQS];
	struct task_struct *dealloc_task;
	wait_queue_head_t dealloc_wq;
	atomic_t inflight_packets;

	/* Use kthread for guest RX */
	struct task_struct *task;
	wait_queue_head_t wq;
	/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
	unsigned int rx_irq;
	/* Only used when feature-split-event-channels = 1 */
	char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
	struct xen_netif_rx_back_ring rx;
	struct sk_buff_head rx_queue;

	unsigned int rx_queue_max;
	unsigned int rx_queue_len;
	unsigned long last_rx_time;
	unsigned int rx_slots_needed;
	bool stalled;

	struct xenvif_copy_state rx_copy;

	/* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
	unsigned long credit_bytes;
	unsigned long credit_usec;
	unsigned long remaining_credit;
	struct timer_list credit_timeout;
	u64 credit_window_start;
	bool rate_limited;

	/* Statistics */
	struct xenvif_stats stats;
	};

	enum state_bit_shift {
	/* This bit marks that the vif is connected */
	VIF_STATUS_CONNECTED,
	};

	struct xenvif_mcast_addr {
	struct list_head entry;
	struct rcu_head rcu;
	u8 addr[6];
	};

	#define XEN_NETBK_MCAST_MAX 64

	#define XEN_NETBK_MAX_HASH_KEY_SIZE 40
	#define XEN_NETBK_MAX_HASH_MAPPING_SIZE 128
	#define XEN_NETBK_HASH_TAG_SIZE 40

	struct xenvif_hash_cache_entry {
	struct list_head link;
	struct rcu_head rcu;
	u8 tag[XEN_NETBK_HASH_TAG_SIZE];
	unsigned int len;
	u32 val;
	int seq;
	};

	struct xenvif_hash_cache {
	spinlock_t lock;
	struct list_head list;
	unsigned int count;
	atomic_t seq;
	};

	struct xenvif_hash {
	unsigned int alg;
	u32 flags;
	bool mapping_sel;
	u8 key[XEN_NETBK_MAX_HASH_KEY_SIZE];
	u32 mapping[2][XEN_NETBK_MAX_HASH_MAPPING_SIZE];
	unsigned int size;
	struct xenvif_hash_cache cache;
	};

	struct backend_info {
	struct xenbus_device *dev;
	struct xenvif *vif;

	/* This is the state that will be reflected in xenstore when any
	* active hotplug script completes.
	*/
	enum xenbus_state state;

	enum xenbus_state frontend_state;
	struct xenbus_watch hotplug_status_watch;
	u8 have_hotplug_status_watch:1;

	const char *hotplug_script;
	};

	struct xenvif {
	/* Unique identifier for this interface. */
	domid_t domid;
	unsigned int handle;

	u8 fe_dev_addr[6];
	struct list_head fe_mcast_addr;
	unsigned int fe_mcast_count;

	/* Frontend feature information. */
	int gso_mask;

	u8 can_sg:1;
	u8 ip_csum:1;
	u8 ipv6_csum:1;
	u8 multicast_control:1;

	/* headroom requested by xen-netfront */
	u16 xdp_headroom;

	/* Is this interface disabled? True when backend discovers
	* frontend is rogue.
	*/
	bool disabled;
	unsigned long status;
	unsigned long drain_timeout;
	unsigned long stall_timeout;

	/* Queues */
	struct xenvif_queue *queues;
	unsigned int num_queues; /* active queues, resource allocated */
	unsigned int stalled_queues;

	struct xenvif_hash hash;

	struct xenbus_watch credit_watch;
	struct xenbus_watch mcast_ctrl_watch;

	struct backend_info *be;

	spinlock_t lock;

	#ifdef CONFIG_DEBUG_FS
	struct dentry *xenvif_dbg_root;
	#endif

	struct xen_netif_ctrl_back_ring ctrl;
	unsigned int ctrl_irq;

	/* Miscellaneous private stuff. */
	struct net_device *dev;
	};

	struct xenvif_rx_cb {
	unsigned long expires;
	int meta_slots_used;
	};

	#define XENVIF_RX_CB(skb) ((struct xenvif_rx_cb *)(skb)->cb)

	static inline struct xenbus_device xenvif_to_xenbus_device(struct xenvif vif)
	{
	return to_xenbus_device(vif->dev->dev.parent);
	}

	void xenvif_tx_credit_callback(struct timer_list *t);

	struct xenvif xenvif_alloc(struct device parent,
	domid_t domid,
	unsigned int handle);

	int xenvif_init_queue(struct xenvif_queue *queue);
	void xenvif_deinit_queue(struct xenvif_queue *queue);

	int xenvif_connect_data(struct xenvif_queue *queue,
	unsigned long tx_ring_ref,
	unsigned long rx_ring_ref,
	unsigned int tx_evtchn,
	unsigned int rx_evtchn);
	void xenvif_disconnect_data(struct xenvif *vif);
	int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
	unsigned int evtchn);
	void xenvif_disconnect_ctrl(struct xenvif *vif);
	void xenvif_free(struct xenvif *vif);

	int xenvif_xenbus_init(void);
	void xenvif_xenbus_fini(void);

	/* (Un)Map communication rings. */
	void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue);
	int xenvif_map_frontend_data_rings(struct xenvif_queue *queue,
	grant_ref_t tx_ring_ref,
	grant_ref_t rx_ring_ref);

	/* Check for SKBs from frontend and schedule backend processing */
	void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue);

	/* Prevent the device from generating any further traffic. */
	void xenvif_carrier_off(struct xenvif *vif);

	int xenvif_tx_action(struct xenvif_queue *queue, int budget);

	int xenvif_kthread_guest_rx(void *data);
	void xenvif_kick_thread(struct xenvif_queue *queue);

	int xenvif_dealloc_kthread(void *data);

	irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data);

	bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread);
	void xenvif_rx_queue_tail(struct xenvif_queue queue, struct sk_buff skb);

	void xenvif_carrier_on(struct xenvif *vif);

	/* Callback from stack when TX packet can be released */
	void xenvif_zerocopy_callback(struct sk_buff skb, struct ubuf_info ubuf,
	bool zerocopy_success);

	static inline pending_ring_idx_t nr_pending_reqs(struct xenvif_queue *queue)
	{
	return MAX_PENDING_REQS -
	queue->pending_prod + queue->pending_cons;
	}

	irqreturn_t xenvif_interrupt(int irq, void *dev_id);

	extern bool separate_tx_rx_irq;
	extern bool provides_xdp_headroom;

	extern unsigned int rx_drain_timeout_msecs;
	extern unsigned int rx_stall_timeout_msecs;
	extern unsigned int xenvif_max_queues;
	extern unsigned int xenvif_hash_cache_size;

	#ifdef CONFIG_DEBUG_FS
	extern struct dentry *xen_netback_dbg_root;
	#endif

	void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
	struct sk_buff *skb);
	void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue);

	/* Multicast control */
	bool xenvif_mcast_match(struct xenvif vif, const u8 addr);
	void xenvif_mcast_addr_list_free(struct xenvif *vif);

	/* Hash */
	void xenvif_init_hash(struct xenvif *vif);
	void xenvif_deinit_hash(struct xenvif *vif);

	u32 xenvif_set_hash_alg(struct xenvif *vif, u32 alg);
	u32 xenvif_get_hash_flags(struct xenvif vif, u32 flags);
	u32 xenvif_set_hash_flags(struct xenvif *vif, u32 flags);
	u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 len);
	u32 xenvif_set_hash_mapping_size(struct xenvif *vif, u32 size);
	u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
	u32 off);

	void xenvif_set_skb_hash(struct xenvif vif, struct sk_buff skb);

	#ifdef CONFIG_DEBUG_FS
	void xenvif_dump_hash_info(struct xenvif vif, struct seq_file m);
	#endif

	#endif /* __XEN_NETBACK__COMMON_H__ */