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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
16struct net_device;
17struct xsk_queue;
18
19struct xdp_umem_page {
20 void *addr;
21 dma_addr_t dma;
22};
23
24struct xdp_umem_fq_reuse {
25 u32 nentries;
26 u32 length;
27 u64 handles[];
28};
29
30struct xdp_umem {
31 struct xsk_queue *fq;
32 struct xsk_queue *cq;
33 struct xdp_umem_page *pages;
34 u64 chunk_mask;
35 u64 size;
36 u32 headroom;
37 u32 chunk_size_nohr;
38 struct user_struct *user;
39 unsigned long address;
40 refcount_t users;
41 struct work_struct work;
42 struct page **pgs;
43 u32 npgs;
44 int id;
45 struct net_device *dev;
46 struct xdp_umem_fq_reuse *fq_reuse;
47 u16 queue_id;
48 bool zc;
49 spinlock_t xsk_list_lock;
50 struct list_head xsk_list;
51};
52
53struct xdp_sock {
54
55 struct sock sk;
56 struct xsk_queue *rx;
57 struct net_device *dev;
58 struct xdp_umem *umem;
59 struct list_head flush_node;
60 u16 queue_id;
61 bool zc;
62 enum {
63 XSK_READY = 0,
64 XSK_BOUND,
65 XSK_UNBOUND,
66 } state;
67
68 struct mutex mutex;
69 struct xsk_queue *tx ____cacheline_aligned_in_smp;
70 struct list_head list;
71
72
73
74 spinlock_t tx_completion_lock;
75
76 spinlock_t rx_lock;
77 u64 rx_dropped;
78};
79
80struct xdp_buff;
81#ifdef CONFIG_XDP_SOCKETS
82int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
83int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
84void xsk_flush(struct xdp_sock *xs);
85bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs);
86
87bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt);
88u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr);
89void xsk_umem_discard_addr(struct xdp_umem *umem);
90void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries);
91bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc);
92void xsk_umem_consume_tx_done(struct xdp_umem *umem);
93struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries);
94struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem,
95 struct xdp_umem_fq_reuse *newq);
96void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq);
97struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id);
98
99static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
100{
101 return umem->pages[addr >> PAGE_SHIFT].addr + (addr & (PAGE_SIZE - 1));
102}
103
104static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
105{
106 return umem->pages[addr >> PAGE_SHIFT].dma + (addr & (PAGE_SIZE - 1));
107}
108
109
110static inline bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
111{
112 struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
113
114 if (rq->length >= cnt)
115 return true;
116
117 return xsk_umem_has_addrs(umem, cnt - rq->length);
118}
119
120static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
121{
122 struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
123
124 if (!rq->length)
125 return xsk_umem_peek_addr(umem, addr);
126
127 *addr = rq->handles[rq->length - 1];
128 return addr;
129}
130
131static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem)
132{
133 struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
134
135 if (!rq->length)
136 xsk_umem_discard_addr(umem);
137 else
138 rq->length--;
139}
140
141static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
142{
143 struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
144
145 rq->handles[rq->length++] = addr;
146}
147#else
148static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
149{
150 return -ENOTSUPP;
151}
152
153static inline int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
154{
155 return -ENOTSUPP;
156}
157
158static inline void xsk_flush(struct xdp_sock *xs)
159{
160}
161
162static inline bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
163{
164 return false;
165}
166
167static inline bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt)
168{
169 return false;
170}
171
172static inline u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr)
173{
174 return NULL;
175}
176
177static inline void xsk_umem_discard_addr(struct xdp_umem *umem)
178{
179}
180
181static inline void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries)
182{
183}
184
185static inline bool xsk_umem_consume_tx(struct xdp_umem *umem,
186 struct xdp_desc *desc)
187{
188 return false;
189}
190
191static inline void xsk_umem_consume_tx_done(struct xdp_umem *umem)
192{
193}
194
195static inline struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries)
196{
197 return NULL;
198}
199
200static inline struct xdp_umem_fq_reuse *xsk_reuseq_swap(
201 struct xdp_umem *umem,
202 struct xdp_umem_fq_reuse *newq)
203{
204 return NULL;
205}
206static inline void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq)
207{
208}
209
210static inline struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
211 u16 queue_id)
212{
213 return NULL;
214}
215
216static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
217{
218 return NULL;
219}
220
221static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
222{
223 return 0;
224}
225
226static inline bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
227{
228 return false;
229}
230
231static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
232{
233 return NULL;
234}
235
236static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem)
237{
238}
239
240static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
241{
242}
243
244#endif
245
246#endif
247