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/bpf.h>
 10#include <linux/workqueue.h>
 11#include <linux/if_xdp.h>
 12#include <linux/mutex.h>
 13#include <linux/spinlock.h>
 14#include <linux/mm.h>
 15#include <net/sock.h>
 16
 17struct net_device;
 18struct xsk_queue;
 19struct xdp_buff;
 20
 21struct xdp_umem {
 22	void *addrs;
 23	u64 size;
 24	u32 headroom;
 25	u32 chunk_size;
 26	u32 chunks;
 27	u32 npgs;
 28	struct user_struct *user;
 29	refcount_t users;
 30	u8 flags;
 31	bool zc;
 32	struct page **pgs;
 33	int id;
 34	struct list_head xsk_dma_list;
 35	struct work_struct work;
 36};
 37
 38struct xsk_map {
 39	struct bpf_map map;
 40	spinlock_t lock; /* Synchronize map updates */
 41	struct xdp_sock __rcu *xsk_map[];
 42};
 43
 44struct xdp_sock {
 45	/* struct sock must be the first member of struct xdp_sock */
 46	struct sock sk;
 47	struct xsk_queue *rx ____cacheline_aligned_in_smp;
 48	struct net_device *dev;
 49	struct xdp_umem *umem;
 50	struct list_head flush_node;
 51	struct xsk_buff_pool *pool;
 52	u16 queue_id;
 53	bool zc;
 54	enum {
 55		XSK_READY = 0,
 56		XSK_BOUND,
 57		XSK_UNBOUND,
 58	} state;
 59
 60	struct xsk_queue *tx ____cacheline_aligned_in_smp;
 61	struct list_head tx_list;
 62	/* Protects generic receive. */
 63	spinlock_t rx_lock;
 64
 65	/* Statistics */
 66	u64 rx_dropped;
 67	u64 rx_queue_full;
 68
 69	struct list_head map_list;
 70	/* Protects map_list */
 71	spinlock_t map_list_lock;
 72	/* Protects multiple processes in the control path */
 73	struct mutex mutex;
 74	struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */
 75	struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */
 76};
 77
 78#ifdef CONFIG_XDP_SOCKETS
 79
 80int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
 81int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
 82void __xsk_map_flush(void);
 83
 84#else
 85
 86static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
 87{
 88	return -ENOTSUPP;
 89}
 90
 91static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
 92{
 93	return -EOPNOTSUPP;
 94}
 95
 96static inline void __xsk_map_flush(void)
 97{
 98}
 99
100#endif /* CONFIG_XDP_SOCKETS */
101
102#endif /* _LINUX_XDP_SOCK_H */