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