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 16 struct net_device; 17 struct xsk_queue; 18 struct xdp_buff; 19 20 struct xdp_umem { 21 struct xsk_queue *fq; 22 struct xsk_queue *cq; 23 struct xsk_buff_pool *pool; 24 u64 size; 25 u32 headroom; 26 u32 chunk_size; 27 struct user_struct *user; 28 refcount_t users; 29 struct work_struct work; 30 struct page **pgs; 31 u32 npgs; 32 u16 queue_id; 33 u8 need_wakeup; 34 u8 flags; 35 int id; 36 struct net_device *dev; 37 bool zc; 38 spinlock_t xsk_tx_list_lock; 39 struct list_head xsk_tx_list; 40 }; 41 42 struct xsk_map { 43 struct bpf_map map; 44 spinlock_t lock; /* Synchronize map updates */ 45 struct xdp_sock *xsk_map[]; 46 }; 47 48 struct xdp_sock { 49 /* struct sock must be the first member of struct xdp_sock */ 50 struct sock sk; 51 struct xsk_queue *rx; 52 struct net_device *dev; 53 struct xdp_umem *umem; 54 struct list_head flush_node; 55 u16 queue_id; 56 bool zc; 57 enum { 58 XSK_READY = 0, 59 XSK_BOUND, 60 XSK_UNBOUND, 61 } state; 62 /* Protects multiple processes in the control path */ 63 struct mutex mutex; 64 struct xsk_queue *tx ____cacheline_aligned_in_smp; 65 struct list_head list; 66 /* Mutual exclusion of NAPI TX thread and sendmsg error paths 67 * in the SKB destructor callback. 68 */ 69 spinlock_t tx_completion_lock; 70 /* Protects generic receive. */ 71 spinlock_t rx_lock; 72 73 /* Statistics */ 74 u64 rx_dropped; 75 u64 rx_queue_full; 76 77 struct list_head map_list; 78 /* Protects map_list */ 79 spinlock_t map_list_lock; 80 }; 81 82 #ifdef CONFIG_XDP_SOCKETS 83 84 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); 85 int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp); 86 void __xsk_map_flush(void); 87 88 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 89 u32 key) 90 { 91 struct xsk_map *m = container_of(map, struct xsk_map, map); 92 struct xdp_sock *xs; 93 94 if (key >= map->max_entries) 95 return NULL; 96 97 xs = READ_ONCE(m->xsk_map[key]); 98 return xs; 99 } 100 101 #else 102 103 static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 104 { 105 return -ENOTSUPP; 106 } 107 108 static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) 109 { 110 return -EOPNOTSUPP; 111 } 112 113 static inline void __xsk_map_flush(void) 114 { 115 } 116 117 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 118 u32 key) 119 { 120 return NULL; 121 } 122 123 #endif /* CONFIG_XDP_SOCKETS */ 124 125 #endif /* _LINUX_XDP_SOCK_H */ 126