tjh.dev
Linux kernel mirror (for testing)
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linux
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;
18
19struct xdp_umem_props {
20 u64 chunk_mask;
21 u64 size;
22};
23
24struct xdp_umem_page {
25 void *addr;
26 dma_addr_t dma;
27};
28
29struct xdp_umem {
30 struct xsk_queue *fq;
31 struct xsk_queue *cq;
32 struct xdp_umem_page *pages;
33 struct xdp_umem_props props;
34 u32 headroom;
35 u32 chunk_size_nohr;
36 struct user_struct *user;
37 struct pid *pid;
38 unsigned long address;
39 refcount_t users;
40 struct work_struct work;
41 struct page **pgs;
42 u32 npgs;
43 struct net_device *dev;
44 u16 queue_id;
45 bool zc;
46 spinlock_t xsk_list_lock;
47 struct list_head xsk_list;
48};
49
50struct xdp_sock {
51 /* struct sock must be the first member of struct xdp_sock */
52 struct sock sk;
53 struct xsk_queue *rx;
54 struct net_device *dev;
55 struct xdp_umem *umem;
56 struct list_head flush_node;
57 u16 queue_id;
58 struct xsk_queue *tx ____cacheline_aligned_in_smp;
59 struct list_head list;
60 bool zc;
61 /* Protects multiple processes in the control path */
62 struct mutex mutex;
63 /* Mutual exclusion of NAPI TX thread and sendmsg error paths
64 * in the SKB destructor callback.
65 */
66 spinlock_t tx_completion_lock;
67 u64 rx_dropped;
68};
69
70struct xdp_buff;
71#ifdef CONFIG_XDP_SOCKETS
72int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
73int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
74void xsk_flush(struct xdp_sock *xs);
75bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs);
76/* Used from netdev driver */
77u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr);
78void xsk_umem_discard_addr(struct xdp_umem *umem);
79void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries);
80bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len);
81void xsk_umem_consume_tx_done(struct xdp_umem *umem);
82#else
83static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
84{
85 return -ENOTSUPP;
86}
87
88static inline int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
89{
90 return -ENOTSUPP;
91}
92
93static inline void xsk_flush(struct xdp_sock *xs)
94{
95}
96
97static inline bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
98{
99 return false;
100}
101#endif /* CONFIG_XDP_SOCKETS */
102
103#endif /* _LINUX_XDP_SOCK_H */