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 96 static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 97 { 98 return -ENOTSUPP; 99 } 100 101 static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) 102 { 103 return -EOPNOTSUPP; 104 } 105 106 static inline void __xsk_map_flush(void) 107 { 108 } 109 110 #endif /* CONFIG_XDP_SOCKETS */ 111 112 #endif /* _LINUX_XDP_SOCK_H */ 113