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 19struct net_device; 20struct xsk_queue; 21struct xdp_buff; 22 23struct 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 40struct 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 47struct 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 90int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); 91int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp); 92void __xsk_map_flush(void); 93 94#else 95 96static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 97{ 98 return -ENOTSUPP; 99} 100 101static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) 102{ 103 return -EOPNOTSUPP; 104} 105 106static inline void __xsk_map_flush(void) 107{ 108} 109 110#endif /* CONFIG_XDP_SOCKETS */ 111 112#endif /* _LINUX_XDP_SOCK_H */ 113