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 /* record the number of tx descriptors sent by this xsk and 67 * when it exceeds MAX_PER_SOCKET_BUDGET, an opportunity needs 68 * to be given to other xsks for sending tx descriptors, thereby 69 * preventing other XSKs from being starved. 70 */ 71 u32 tx_budget_spent; 72 73 /* Protects generic receive. */ 74 spinlock_t rx_lock; 75 76 /* Statistics */ 77 u64 rx_dropped; 78 u64 rx_queue_full; 79 80 /* When __xsk_generic_xmit() must return before it sees the EOP descriptor for the current 81 * packet, the partially built skb is saved here so that packet building can resume in next 82 * call of __xsk_generic_xmit(). 83 */ 84 struct sk_buff *skb; 85 86 struct list_head map_list; 87 /* Protects map_list */ 88 spinlock_t map_list_lock; 89 /* Protects multiple processes in the control path */ 90 struct mutex mutex; 91 struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */ 92 struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */ 93 }; 94 95 #ifdef CONFIG_XDP_SOCKETS 96 97 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); 98 int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp); 99 void __xsk_map_flush(void); 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 #endif /* CONFIG_XDP_SOCKETS */ 118 119 #if defined(CONFIG_XDP_SOCKETS) && defined(CONFIG_DEBUG_NET) 120 bool xsk_map_check_flush(void); 121 #else 122 static inline bool xsk_map_check_flush(void) 123 { 124 return false; 125 } 126 #endif 127 128 #endif /* _LINUX_XDP_SOCK_H */ 129