Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#ifndef IOU_ZC_RX_H
3#define IOU_ZC_RX_H
4
5#include <linux/io_uring_types.h>
6#include <linux/dma-buf.h>
7#include <linux/socket.h>
8#include <net/page_pool/types.h>
9#include <net/net_trackers.h>
10
11struct io_zcrx_mem {
12 unsigned long size;
13 bool is_dmabuf;
14
15 struct page **pages;
16 unsigned long nr_folios;
17 struct sg_table page_sg_table;
18 unsigned long account_pages;
19 struct sg_table *sgt;
20
21 struct dma_buf_attachment *attach;
22 struct dma_buf *dmabuf;
23};
24
25struct io_zcrx_area {
26 struct net_iov_area nia;
27 struct io_zcrx_ifq *ifq;
28 atomic_t *user_refs;
29
30 bool is_mapped;
31 u16 area_id;
32
33 /* freelist */
34 spinlock_t freelist_lock ____cacheline_aligned_in_smp;
35 u32 free_count;
36 u32 *freelist;
37
38 struct io_zcrx_mem mem;
39};
40
41struct io_zcrx_ifq {
42 struct io_zcrx_area *area;
43 unsigned niov_shift;
44 struct user_struct *user;
45 struct mm_struct *mm_account;
46
47 spinlock_t rq_lock ____cacheline_aligned_in_smp;
48 struct io_uring *rq_ring;
49 struct io_uring_zcrx_rqe *rqes;
50 u32 cached_rq_head;
51 u32 rq_entries;
52
53 u32 if_rxq;
54 struct device *dev;
55 struct net_device *netdev;
56 netdevice_tracker netdev_tracker;
57 refcount_t refs;
58 /* counts userspace facing users like io_uring */
59 refcount_t user_refs;
60
61 /*
62 * Page pool and net configuration lock, can be taken deeper in the
63 * net stack.
64 */
65 struct mutex pp_lock;
66 struct io_mapped_region region;
67};
68
69#if defined(CONFIG_IO_URING_ZCRX)
70int io_zcrx_ctrl(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_arg);
71int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
72 struct io_uring_zcrx_ifq_reg __user *arg);
73void io_unregister_zcrx_ifqs(struct io_ring_ctx *ctx);
74int io_zcrx_recv(struct io_kiocb *req, struct io_zcrx_ifq *ifq,
75 struct socket *sock, unsigned int flags,
76 unsigned issue_flags, unsigned int *len);
77struct io_mapped_region *io_zcrx_get_region(struct io_ring_ctx *ctx,
78 unsigned int id);
79#else
80static inline int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
81 struct io_uring_zcrx_ifq_reg __user *arg)
82{
83 return -EOPNOTSUPP;
84}
85static inline void io_unregister_zcrx_ifqs(struct io_ring_ctx *ctx)
86{
87}
88static inline int io_zcrx_recv(struct io_kiocb *req, struct io_zcrx_ifq *ifq,
89 struct socket *sock, unsigned int flags,
90 unsigned issue_flags, unsigned int *len)
91{
92 return -EOPNOTSUPP;
93}
94static inline struct io_mapped_region *io_zcrx_get_region(struct io_ring_ctx *ctx,
95 unsigned int id)
96{
97 return NULL;
98}
99static inline int io_zcrx_ctrl(struct io_ring_ctx *ctx,
100 void __user *arg, unsigned nr_arg)
101{
102 return -EOPNOTSUPP;
103}
104#endif
105
106int io_recvzc(struct io_kiocb *req, unsigned int issue_flags);
107int io_recvzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
108
109#endif