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
19 struct net_device;
20 struct xsk_queue;
21 struct xdp_buff;
22
23 struct 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
40 struct 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
47 struct 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 /* Protects generic receive. */
67 spinlock_t rx_lock;
68
69 /* Statistics */
70 u64 rx_dropped;
71 u64 rx_queue_full;
72
73 /* When __xsk_generic_xmit() must return before it sees the EOP descriptor for the current
74 * packet, the partially built skb is saved here so that packet building can resume in next
75 * call of __xsk_generic_xmit().
76 */
77 struct sk_buff *skb;
78
79 struct list_head map_list;
80 /* Protects map_list */
81 spinlock_t map_list_lock;
82 /* Protects multiple processes in the control path */
83 struct mutex mutex;
84 struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */
85 struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */
86 };
87
88 #ifdef CONFIG_XDP_SOCKETS
89
90 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
91 int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
92 void __xsk_map_flush(void);
93
94 #else
95
xsk_generic_rcv(struct xdp_sock * xs,struct xdp_buff * xdp)96 static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
97 {
98 return -ENOTSUPP;
99 }
100
__xsk_map_redirect(struct xdp_sock * xs,struct xdp_buff * xdp)101 static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
102 {
103 return -EOPNOTSUPP;
104 }
105
__xsk_map_flush(void)106 static inline void __xsk_map_flush(void)
107 {
108 }
109
110 #endif /* CONFIG_XDP_SOCKETS */
111
112 #endif /* _LINUX_XDP_SOCK_H */
113