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	void *addrs;
 22	u64 size;
 23	u32 headroom;
 24	u32 chunk_size;
 25	u32 chunks;
 26	u32 npgs;
 27	struct user_struct *user;
 28	refcount_t users;
 29	u8 flags;
 30	bool zc;
 31	struct page **pgs;
 32	int id;
 33	struct list_head xsk_dma_list;
 34	struct work_struct work;
 35};
 36
 37struct xsk_map {
 38	struct bpf_map map;
 39	spinlock_t lock; /* Synchronize map updates */
 40	struct xdp_sock __rcu *xsk_map[];
 41};
 42
 43struct xdp_sock {
 44	/* struct sock must be the first member of struct xdp_sock */
 45	struct sock sk;
 46	struct xsk_queue *rx ____cacheline_aligned_in_smp;
 47	struct net_device *dev;
 48	struct xdp_umem *umem;
 49	struct list_head flush_node;
 50	struct xsk_buff_pool *pool;
 51	u16 queue_id;
 52	bool zc;
 53	enum {
 54		XSK_READY = 0,
 55		XSK_BOUND,
 56		XSK_UNBOUND,
 57	} state;
 58
 59	struct xsk_queue *tx ____cacheline_aligned_in_smp;
 60	struct list_head tx_list;
 61	/* Protects generic receive. */
 62	spinlock_t rx_lock;
 63
 64	/* Statistics */
 65	u64 rx_dropped;
 66	u64 rx_queue_full;
 67
 68	struct list_head map_list;
 69	/* Protects map_list */
 70	spinlock_t map_list_lock;
 71	/* Protects multiple processes in the control path */
 72	struct mutex mutex;
 73	struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */
 74	struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */
 75};
 76
 77#ifdef CONFIG_XDP_SOCKETS
 78
 79int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
 80int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
 81void __xsk_map_flush(void);
 82
 83#else
 84
 85static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
 86{
 87	return -ENOTSUPP;
 88}
 89
 90static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
 91{
 92	return -EOPNOTSUPP;
 93}
 94
 95static inline void __xsk_map_flush(void)
 96{
 97}
 98
 99#endif /* CONFIG_XDP_SOCKETS */
100
101#endif /* _LINUX_XDP_SOCK_H */