1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* 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 <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;
unsigned long address;
refcount_t users;
struct work_struct work;
struct page **pgs;
u32 npgs;
int id;
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;
bool zc;
/* Protects multiple processes in the control path */
struct mutex mutex;
struct xsk_queue *tx ____cacheline_aligned_in_smp;
struct list_head list;
/* Mutual exclusion of NAPI TX thread and sendmsg error paths
* in the SKB destructor callback.
*/
spinlock_t tx_completion_lock;
/* Protects generic receive. */
spinlock_t rx_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 */
bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt);
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, struct xdp_desc *desc);
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 bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
{
struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
if (rq->length >= cnt)
return true;
return xsk_umem_has_addrs(umem, cnt - rq->length);
}
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 bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt)
{
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,
struct xdp_desc *desc)
{
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 bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
{
return false;
}
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 */
|
