Edit File: xdp_sock.h
/* SPDX-License-Identifier: GPL-2.0 */ /* AF_XDP internal functions * Copyright(c) 2018 Intel Corporation. */ #ifndef _LINUX_XDP_SOCK_H #define _LINUX_XDP_SOCK_H #include <linux/workqueue.h> #include <linux/if_xdp.h> #include <linux/mutex.h> #include <linux/spinlock.h> #include <linux/mm.h> #include <linux/refcount.h> #include <net/sock.h> struct net_device; struct xsk_queue; struct xdp_umem_page { void *addr; dma_addr_t dma; }; struct xdp_umem_fq_reuse { u32 nentries; u32 length; u64 handles[]; }; struct xdp_umem { struct xsk_queue *fq; struct xsk_queue *cq; struct xdp_umem_page *pages; u64 chunk_mask; u64 size; u32 headroom; u32 chunk_size_nohr; struct user_struct *user; struct pid *pid; unsigned long address; refcount_t users; struct work_struct work; struct page **pgs; u32 npgs; struct net_device *dev; struct xdp_umem_fq_reuse *fq_reuse; u16 queue_id; bool zc; spinlock_t xsk_list_lock; struct list_head xsk_list; }; struct xdp_sock { /* struct sock must be the first member of struct xdp_sock */ struct sock sk; struct xsk_queue *rx; struct net_device *dev; struct xdp_umem *umem; struct list_head flush_node; u16 queue_id; struct xsk_queue *tx ____cacheline_aligned_in_smp; struct list_head list; bool zc; /* Protects multiple processes in the control path */ struct mutex mutex; /* Mutual exclusion of NAPI TX thread and sendmsg error paths * in the SKB destructor callback. */ spinlock_t tx_completion_lock; u64 rx_dropped; }; struct xdp_buff; #ifdef CONFIG_XDP_SOCKETS int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp); void xsk_flush(struct xdp_sock *xs); bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs); /* Used from netdev driver */ u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr); void xsk_umem_discard_addr(struct xdp_umem *umem); void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries); bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len); void xsk_umem_consume_tx_done(struct xdp_umem *umem); struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries); struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem, struct xdp_umem_fq_reuse *newq); void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq); struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id); static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr) { return umem->pages[addr >> PAGE_SHIFT].addr + (addr & (PAGE_SIZE - 1)); } static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr) { return umem->pages[addr >> PAGE_SHIFT].dma + (addr & (PAGE_SIZE - 1)); } /* Reuse-queue aware version of FILL queue helpers */ static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr) { struct xdp_umem_fq_reuse *rq = umem->fq_reuse; if (!rq->length) return xsk_umem_peek_addr(umem, addr); *addr = rq->handles[rq->length - 1]; return addr; } static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem) { struct xdp_umem_fq_reuse *rq = umem->fq_reuse; if (!rq->length) xsk_umem_discard_addr(umem); else rq->length--; } static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr) { struct xdp_umem_fq_reuse *rq = umem->fq_reuse; rq->handles[rq->length++] = addr; } #else static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) { return -ENOTSUPP; } static inline int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) { return -ENOTSUPP; } static inline void xsk_flush(struct xdp_sock *xs) { } static inline bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) { return false; } static inline u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) { return NULL; } static inline void xsk_umem_discard_addr(struct xdp_umem *umem) { } static inline void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) { } static inline bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len) { return false; } static inline void xsk_umem_consume_tx_done(struct xdp_umem *umem) { } static inline struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries) { return NULL; } static inline struct xdp_umem_fq_reuse *xsk_reuseq_swap( struct xdp_umem *umem, struct xdp_umem_fq_reuse *newq) { return NULL; } static inline void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq) { } static inline struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id) { return NULL; } static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr) { return NULL; } static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr) { return 0; } static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr) { return NULL; } static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem) { } static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr) { } #endif /* CONFIG_XDP_SOCKETS */ #endif /* _LINUX_XDP_SOCK_H */