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 struct net_device; 18 struct xsk_queue; 19 struct xdp_buff; 20 21 struct xdp_umem { 22 void *addrs; 23 u64 size; 24 u32 headroom; 25 u32 chunk_size; 26 u32 chunks; 27 u32 npgs; 28 struct user_struct *user; 29 refcount_t users; 30 u8 flags; 31 bool zc; 32 struct page **pgs; 33 int id; 34 struct list_head xsk_dma_list; 35 struct work_struct work; 36 }; 37 38 struct xsk_map { 39 struct bpf_map map; 40 spinlock_t lock; /* Synchronize map updates */ 41 atomic_t count; 42 struct xdp_sock __rcu *xsk_map[]; 43 }; 44 45 struct xdp_sock { 46 /* struct sock must be the first member of struct xdp_sock */ 47 struct sock sk; 48 struct xsk_queue *rx ____cacheline_aligned_in_smp; 49 struct net_device *dev; 50 struct xdp_umem *umem; 51 struct list_head flush_node; 52 struct xsk_buff_pool *pool; 53 u16 queue_id; 54 bool zc; 55 enum { 56 XSK_READY = 0, 57 XSK_BOUND, 58 XSK_UNBOUND, 59 } state; 60 61 struct xsk_queue *tx ____cacheline_aligned_in_smp; 62 struct list_head tx_list; 63 /* Protects generic receive. */ 64 spinlock_t rx_lock; 65 66 /* Statistics */ 67 u64 rx_dropped; 68 u64 rx_queue_full; 69 70 struct list_head map_list; 71 /* Protects map_list */ 72 spinlock_t map_list_lock; 73 /* Protects multiple processes in the control path */ 74 struct mutex mutex; 75 struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */ 76 struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */ 77 }; 78 79 #ifdef CONFIG_XDP_SOCKETS 80 81 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); 82 int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp); 83 void __xsk_map_flush(void); 84 85 #else 86 87 static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 88 { 89 return -ENOTSUPP; 90 } 91 92 static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) 93 { 94 return -EOPNOTSUPP; 95 } 96 97 static inline void __xsk_map_flush(void) 98 { 99 } 100 101 #endif /* CONFIG_XDP_SOCKETS */ 102 103 #endif /* _LINUX_XDP_SOCK_H */ 104