xref: /openbmc/linux/include/net/xdp_sock_drv.h (revision 48cc39c3) 
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Interface for implementing AF_XDP zero-copy support in drivers.
3  * Copyright(c) 2020 Intel Corporation.
4  */
5 
6 #ifndef _LINUX_XDP_SOCK_DRV_H
7 #define _LINUX_XDP_SOCK_DRV_H
8 
9 #include <net/xdp_sock.h>
10 #include <net/xsk_buff_pool.h>
11 
12 #ifdef CONFIG_XDP_SOCKETS
13 
14 void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
15 bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
16 u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, struct xdp_desc *desc, u32 max);
17 void xsk_tx_release(struct xsk_buff_pool *pool);
18 struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev,
19 					    u16 queue_id);
20 void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool);
21 void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool);
22 void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool);
23 void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool);
24 bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool);
25 
26 static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
27 {
28 	return XDP_PACKET_HEADROOM + pool->headroom;
29 }
30 
31 static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
32 {
33 	return pool->chunk_size;
34 }
35 
36 static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
37 {
38 	return xsk_pool_get_chunk_size(pool) - xsk_pool_get_headroom(pool);
39 }
40 
41 static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
42 					 struct xdp_rxq_info *rxq)
43 {
44 	xp_set_rxq_info(pool, rxq);
45 }
46 
47 static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
48 				      unsigned long attrs)
49 {
50 	xp_dma_unmap(pool, attrs);
51 }
52 
53 static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
54 				   struct device *dev, unsigned long attrs)
55 {
56 	struct xdp_umem *umem = pool->umem;
57 
58 	return xp_dma_map(pool, dev, attrs, umem->pgs, umem->npgs);
59 }
60 
61 static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
62 {
63 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
64 
65 	return xp_get_dma(xskb);
66 }
67 
68 static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
69 {
70 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
71 
72 	return xp_get_frame_dma(xskb);
73 }
74 
75 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
76 {
77 	return xp_alloc(pool);
78 }
79 
80 static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
81 {
82 	return xp_can_alloc(pool, count);
83 }
84 
85 static inline void xsk_buff_free(struct xdp_buff *xdp)
86 {
87 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
88 
89 	xp_free(xskb);
90 }
91 
92 static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
93 					      u64 addr)
94 {
95 	return xp_raw_get_dma(pool, addr);
96 }
97 
98 static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
99 {
100 	return xp_raw_get_data(pool, addr);
101 }
102 
103 static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
104 {
105 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
106 
107 	if (!pool->dma_need_sync)
108 		return;
109 
110 	xp_dma_sync_for_cpu(xskb);
111 }
112 
113 static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
114 						    dma_addr_t dma,
115 						    size_t size)
116 {
117 	xp_dma_sync_for_device(pool, dma, size);
118 }
119 
120 #else
121 
122 static inline void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries)
123 {
124 }
125 
126 static inline bool xsk_tx_peek_desc(struct xsk_buff_pool *pool,
127 				    struct xdp_desc *desc)
128 {
129 	return false;
130 }
131 
132 static inline u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, struct xdp_desc *desc,
133 						 u32 max)
134 {
135 	return 0;
136 }
137 
138 static inline void xsk_tx_release(struct xsk_buff_pool *pool)
139 {
140 }
141 
142 static inline struct xsk_buff_pool *
143 xsk_get_pool_from_qid(struct net_device *dev, u16 queue_id)
144 {
145 	return NULL;
146 }
147 
148 static inline void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool)
149 {
150 }
151 
152 static inline void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool)
153 {
154 }
155 
156 static inline void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool)
157 {
158 }
159 
160 static inline void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool)
161 {
162 }
163 
164 static inline bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool)
165 {
166 	return false;
167 }
168 
169 static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
170 {
171 	return 0;
172 }
173 
174 static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
175 {
176 	return 0;
177 }
178 
179 static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
180 {
181 	return 0;
182 }
183 
184 static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
185 					 struct xdp_rxq_info *rxq)
186 {
187 }
188 
189 static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
190 				      unsigned long attrs)
191 {
192 }
193 
194 static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
195 				   struct device *dev, unsigned long attrs)
196 {
197 	return 0;
198 }
199 
200 static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
201 {
202 	return 0;
203 }
204 
205 static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
206 {
207 	return 0;
208 }
209 
210 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
211 {
212 	return NULL;
213 }
214 
215 static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
216 {
217 	return false;
218 }
219 
220 static inline void xsk_buff_free(struct xdp_buff *xdp)
221 {
222 }
223 
224 static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
225 					      u64 addr)
226 {
227 	return 0;
228 }
229 
230 static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
231 {
232 	return NULL;
233 }
234 
235 static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
236 {
237 }
238 
239 static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
240 						    dma_addr_t dma,
241 						    size_t size)
242 {
243 }
244 
245 #endif /* CONFIG_XDP_SOCKETS */
246 
247 #endif /* _LINUX_XDP_SOCK_DRV_H */
248