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 19 struct xdp_umem_page { 20 void *addr; 21 dma_addr_t dma; 22 }; 23 24 struct xdp_umem { 25 struct xsk_queue *fq; 26 struct xsk_queue *cq; 27 struct xdp_umem_page *pages; 28 u64 chunk_mask; 29 u64 size; 30 u32 headroom; 31 u32 chunk_size_nohr; 32 struct user_struct *user; 33 struct pid *pid; 34 unsigned long address; 35 refcount_t users; 36 struct work_struct work; 37 struct page **pgs; 38 u32 npgs; 39 struct net_device *dev; 40 u16 queue_id; 41 bool zc; 42 spinlock_t xsk_list_lock; 43 struct list_head xsk_list; 44 }; 45 46 struct xdp_sock { 47 /* struct sock must be the first member of struct xdp_sock */ 48 struct sock sk; 49 struct xsk_queue *rx; 50 struct net_device *dev; 51 struct xdp_umem *umem; 52 struct list_head flush_node; 53 u16 queue_id; 54 struct xsk_queue *tx ____cacheline_aligned_in_smp; 55 struct list_head list; 56 bool zc; 57 /* Protects multiple processes in the control path */ 58 struct mutex mutex; 59 /* Mutual exclusion of NAPI TX thread and sendmsg error paths 60 * in the SKB destructor callback. 61 */ 62 spinlock_t tx_completion_lock; 63 u64 rx_dropped; 64 }; 65 66 struct xdp_buff; 67 #ifdef CONFIG_XDP_SOCKETS 68 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); 69 int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); 70 void xsk_flush(struct xdp_sock *xs); 71 bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs); 72 /* Used from netdev driver */ 73 u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr); 74 void xsk_umem_discard_addr(struct xdp_umem *umem); 75 void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries); 76 bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len); 77 void xsk_umem_consume_tx_done(struct xdp_umem *umem); 78 79 static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr) 80 { 81 return umem->pages[addr >> PAGE_SHIFT].addr + (addr & (PAGE_SIZE - 1)); 82 } 83 84 static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr) 85 { 86 return umem->pages[addr >> PAGE_SHIFT].dma + (addr & (PAGE_SIZE - 1)); 87 } 88 #else 89 static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 90 { 91 return -ENOTSUPP; 92 } 93 94 static inline int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) 95 { 96 return -ENOTSUPP; 97 } 98 99 static inline void xsk_flush(struct xdp_sock *xs) 100 { 101 } 102 103 static inline bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) 104 { 105 return false; 106 } 107 108 static inline u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) 109 { 110 return NULL; 111 } 112 113 static inline void xsk_umem_discard_addr(struct xdp_umem *umem) 114 { 115 } 116 117 static inline void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) 118 { 119 } 120 121 static inline bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, 122 u32 *len) 123 { 124 return false; 125 } 126 127 static inline void xsk_umem_consume_tx_done(struct xdp_umem *umem) 128 { 129 } 130 131 static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr) 132 { 133 return NULL; 134 } 135 136 static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr) 137 { 138 return 0; 139 } 140 #endif /* CONFIG_XDP_SOCKETS */ 141 142 #endif /* _LINUX_XDP_SOCK_H */ 143