1/* SPDX-License-Identifier: GPL-2.0 */
  2/* AF_XDP internal functions
  3 * Copyright(c) 2018 Intel Corporation.
  4 */
  5
  6#ifndef _LINUX_XDP_SOCK_H
  7#define _LINUX_XDP_SOCK_H
  8
  9#include <linux/workqueue.h>
 10#include <linux/if_xdp.h>
 11#include <linux/mutex.h>
 12#include <linux/spinlock.h>
 13#include <linux/mm.h>
 14#include <net/sock.h>
 15
 16struct net_device;
 17struct xsk_queue;
 18struct xdp_buff;
 19
 20struct xdp_umem {
 21	struct xsk_queue *fq;
 22	struct xsk_queue *cq;
 23	struct xsk_buff_pool *pool;
 24	u64 size;
 25	u32 headroom;
 26	u32 chunk_size;
 27	struct user_struct *user;
 28	refcount_t users;
 29	struct work_struct work;
 30	struct page **pgs;
 31	u32 npgs;
 32	u16 queue_id;
 33	u8 need_wakeup;
 34	u8 flags;
 35	int id;
 36	struct net_device *dev;
 37	bool zc;
 38	spinlock_t xsk_tx_list_lock;
 39	struct list_head xsk_tx_list;
 40};
 41
 42struct xsk_map {
 43	struct bpf_map map;
 44	spinlock_t lock; /* Synchronize map updates */
 45	struct xdp_sock *xsk_map[];
 46};
 47
 48struct xdp_sock {
 49	/* struct sock must be the first member of struct xdp_sock */
 50	struct sock sk;
 51	struct xsk_queue *rx;
 52	struct net_device *dev;
 53	struct xdp_umem *umem;
 54	struct list_head flush_node;
 55	u16 queue_id;
 56	bool zc;
 57	enum {
 58		XSK_READY = 0,
 59		XSK_BOUND,
 60		XSK_UNBOUND,
 61	} state;
 62	/* Protects multiple processes in the control path */
 63	struct mutex mutex;
 64	struct xsk_queue *tx ____cacheline_aligned_in_smp;
 65	struct list_head list;
 66	/* Mutual exclusion of NAPI TX thread and sendmsg error paths
 67	 * in the SKB destructor callback.
 68	 */
 69	spinlock_t tx_completion_lock;
 70	/* Protects generic receive. */
 71	spinlock_t rx_lock;
 72
 73	/* Statistics */
 74	u64 rx_dropped;
 75	u64 rx_queue_full;
 76
 77	struct list_head map_list;
 78	/* Protects map_list */
 79	spinlock_t map_list_lock;
 80};
 81
 82#ifdef CONFIG_XDP_SOCKETS
 83
 84int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
 85int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
 86void __xsk_map_flush(void);
 87
 88static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
 89						     u32 key)
 90{
 91	struct xsk_map *m = container_of(map, struct xsk_map, map);
 92	struct xdp_sock *xs;
 93
 94	if (key >= map->max_entries)
 95		return NULL;
 96
 97	xs = READ_ONCE(m->xsk_map[key]);
 98	return xs;
 99}
100
101#else
102
103static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
104{
105	return -ENOTSUPP;
106}
107
108static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
109{
110	return -EOPNOTSUPP;
111}
112
113static inline void __xsk_map_flush(void)
114{
115}
116
117static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
118						     u32 key)
119{
120	return NULL;
121}
122
123#endif /* CONFIG_XDP_SOCKETS */
124
125#endif /* _LINUX_XDP_SOCK_H */