/* SPDX-License-Identifier: GPL-2.0 */
  /* AF_XDP internal functions

   * Copyright(c) 2018 Intel Corporation.

   */
  
  #ifndef _LINUX_XDP_SOCK_H
  #define _LINUX_XDP_SOCK_H

  #include <linux/workqueue.h>
  #include <linux/if_xdp.h>

  #include <linux/mutex.h>

  #include <linux/spinlock.h>

  #include <linux/mm.h>

  #include <net/sock.h>

  struct net_device;
  struct xsk_queue;

  struct xdp_buff;

  struct xdp_umem {

  	void *addrs;

  	u64 size;

  	u32 headroom;

  	u32 chunk_size;

  	u32 chunks;

  	u32 npgs;

  	struct user_struct *user;

  	refcount_t users;

  	u8 flags;

  	bool zc;

  	struct page **pgs;
  	int id;

  	struct list_head xsk_dma_list;

  	struct work_struct work;

  };

  struct xsk_map {
  	struct bpf_map map;

  	spinlock_t lock; /* Synchronize map updates */
  	struct xdp_sock *xsk_map[];
  };

  struct xdp_sock {
  	/* struct sock must be the first member of struct xdp_sock */
  	struct sock sk;

  	struct xsk_queue *rx ____cacheline_aligned_in_smp;

  	struct net_device *dev;

  	struct xdp_umem *umem;

  	struct list_head flush_node;

  	struct xsk_buff_pool *pool;

  	u16 queue_id;

  	bool zc;

  	enum {
  		XSK_READY = 0,
  		XSK_BOUND,
  		XSK_UNBOUND,
  	} state;

  	struct xsk_queue *tx ____cacheline_aligned_in_smp;

  	struct list_head tx_list;

  	/* Protects generic receive. */
  	spinlock_t rx_lock;

  
  	/* Statistics */

  	u64 rx_dropped;

  	u64 rx_queue_full;

  	struct list_head map_list;
  	/* Protects map_list */
  	spinlock_t map_list_lock;

  	/* Protects multiple processes in the control path */
  	struct mutex mutex;

  	struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */
  	struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */

  };

  #ifdef CONFIG_XDP_SOCKETS

  int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);

  int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
  void __xsk_map_flush(void);

  
  static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
  						     u32 key)
  {
  	struct xsk_map *m = container_of(map, struct xsk_map, map);
  	struct xdp_sock *xs;
  
  	if (key >= map->max_entries)
  		return NULL;
  
  	xs = READ_ONCE(m->xsk_map[key]);
  	return xs;
  }

  #else

  static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
  {
  	return -ENOTSUPP;
  }

  static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)

  {

  	return -EOPNOTSUPP;

  }

  static inline void __xsk_map_flush(void)

  {
  }

  static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
  						     u32 key)

  {
  	return NULL;
  }

  #endif /* CONFIG_XDP_SOCKETS */

  #endif /* _LINUX_XDP_SOCK_H */