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Linux kernel mirror (for testing)
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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
17#define XDP_UMEM_SG_FLAG (1 << 1)
18
19struct net_device;
20struct xsk_queue;
21struct xdp_buff;
22
23struct xdp_umem {
24 void *addrs;
25 u64 size;
26 u32 headroom;
27 u32 chunk_size;
28 u32 chunks;
29 u32 npgs;
30 struct user_struct *user;
31 refcount_t users;
32 u8 flags;
33 bool zc;
34 struct page **pgs;
35 int id;
36 struct list_head xsk_dma_list;
37 struct work_struct work;
38};
39
40struct xsk_map {
41 struct bpf_map map;
42 spinlock_t lock; /* Synchronize map updates */
43 atomic_t count;
44 struct xdp_sock __rcu *xsk_map[];
45};
46
47struct xdp_sock {
48 /* struct sock must be the first member of struct xdp_sock */
49 struct sock sk;
50 struct xsk_queue *rx ____cacheline_aligned_in_smp;
51 struct net_device *dev;
52 struct xdp_umem *umem;
53 struct list_head flush_node;
54 struct xsk_buff_pool *pool;
55 u16 queue_id;
56 bool zc;
57 bool sg;
58 enum {
59 XSK_READY = 0,
60 XSK_BOUND,
61 XSK_UNBOUND,
62 } state;
63
64 struct xsk_queue *tx ____cacheline_aligned_in_smp;
65 struct list_head tx_list;
66 /* record the number of tx descriptors sent by this xsk and
67 * when it exceeds MAX_PER_SOCKET_BUDGET, an opportunity needs
68 * to be given to other xsks for sending tx descriptors, thereby
69 * preventing other XSKs from being starved.
70 */
71 u32 tx_budget_spent;
72
73 /* Protects generic receive. */
74 spinlock_t rx_lock;
75
76 /* Statistics */
77 u64 rx_dropped;
78 u64 rx_queue_full;
79
80 /* When __xsk_generic_xmit() must return before it sees the EOP descriptor for the current
81 * packet, the partially built skb is saved here so that packet building can resume in next
82 * call of __xsk_generic_xmit().
83 */
84 struct sk_buff *skb;
85
86 struct list_head map_list;
87 /* Protects map_list */
88 spinlock_t map_list_lock;
89 /* Protects multiple processes in the control path */
90 struct mutex mutex;
91 struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */
92 struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */
93};
94
95#ifdef CONFIG_XDP_SOCKETS
96
97int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
98int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
99void __xsk_map_flush(void);
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
117#endif /* CONFIG_XDP_SOCKETS */
118
119#if defined(CONFIG_XDP_SOCKETS) && defined(CONFIG_DEBUG_NET)
120bool xsk_map_check_flush(void);
121#else
122static inline bool xsk_map_check_flush(void)
123{
124 return false;
125}
126#endif
127
128#endif /* _LINUX_XDP_SOCK_H */