xref: /openbmc/linux/include/net/xdp_sock_drv.h (revision 3bf90eca) 
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 #define XDP_UMEM_MIN_CHUNK_SHIFT 11
13 #define XDP_UMEM_MIN_CHUNK_SIZE (1 << XDP_UMEM_MIN_CHUNK_SHIFT)
14 
15 #ifdef CONFIG_XDP_SOCKETS
16 
17 void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
18 bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
19 u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max);
20 void xsk_tx_release(struct xsk_buff_pool *pool);
21 struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev,
22 					    u16 queue_id);
23 void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool);
24 void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool);
25 void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool);
26 void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool);
27 bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool);
28 
29 static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
30 {
31 	return XDP_PACKET_HEADROOM + pool->headroom;
32 }
33 
34 static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
35 {
36 	return pool->chunk_size;
37 }
38 
39 static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
40 {
41 	return xsk_pool_get_chunk_size(pool) - xsk_pool_get_headroom(pool);
42 }
43 
44 static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
45 					 struct xdp_rxq_info *rxq)
46 {
47 	xp_set_rxq_info(pool, rxq);
48 }
49 
50 static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
51 {
52 #ifdef CONFIG_NET_RX_BUSY_POLL
53 	return pool->heads[0].xdp.rxq->napi_id;
54 #else
55 	return 0;
56 #endif
57 }
58 
59 static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
60 				      unsigned long attrs)
61 {
62 	xp_dma_unmap(pool, attrs);
63 }
64 
65 static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
66 				   struct device *dev, unsigned long attrs)
67 {
68 	struct xdp_umem *umem = pool->umem;
69 
70 	return xp_dma_map(pool, dev, attrs, umem->pgs, umem->npgs);
71 }
72 
73 static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
74 {
75 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
76 
77 	return xp_get_dma(xskb);
78 }
79 
80 static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
81 {
82 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
83 
84 	return xp_get_frame_dma(xskb);
85 }
86 
87 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
88 {
89 	return xp_alloc(pool);
90 }
91 
92 /* Returns as many entries as possible up to max. 0 <= N <= max. */
93 static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
94 {
95 	return xp_alloc_batch(pool, xdp, max);
96 }
97 
98 static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
99 {
100 	return xp_can_alloc(pool, count);
101 }
102 
103 static inline void xsk_buff_free(struct xdp_buff *xdp)
104 {
105 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
106 
107 	xp_free(xskb);
108 }
109 
110 static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
111 {
112 	xdp->data = xdp->data_hard_start + XDP_PACKET_HEADROOM;
113 	xdp->data_meta = xdp->data;
114 	xdp->data_end = xdp->data + size;
115 }
116 
117 static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
118 					      u64 addr)
119 {
120 	return xp_raw_get_dma(pool, addr);
121 }
122 
123 static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
124 {
125 	return xp_raw_get_data(pool, addr);
126 }
127 
128 static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
129 {
130 	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
131 
132 	if (!pool->dma_need_sync)
133 		return;
134 
135 	xp_dma_sync_for_cpu(xskb);
136 }
137 
138 static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
139 						    dma_addr_t dma,
140 						    size_t size)
141 {
142 	xp_dma_sync_for_device(pool, dma, size);
143 }
144 
145 #else
146 
147 static inline void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries)
148 {
149 }
150 
151 static inline bool xsk_tx_peek_desc(struct xsk_buff_pool *pool,
152 				    struct xdp_desc *desc)
153 {
154 	return false;
155 }
156 
157 static inline u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max)
158 {
159 	return 0;
160 }
161 
162 static inline void xsk_tx_release(struct xsk_buff_pool *pool)
163 {
164 }
165 
166 static inline struct xsk_buff_pool *
167 xsk_get_pool_from_qid(struct net_device *dev, u16 queue_id)
168 {
169 	return NULL;
170 }
171 
172 static inline void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool)
173 {
174 }
175 
176 static inline void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool)
177 {
178 }
179 
180 static inline void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool)
181 {
182 }
183 
184 static inline void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool)
185 {
186 }
187 
188 static inline bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool)
189 {
190 	return false;
191 }
192 
193 static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
194 {
195 	return 0;
196 }
197 
198 static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
199 {
200 	return 0;
201 }
202 
203 static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
204 {
205 	return 0;
206 }
207 
208 static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
209 					 struct xdp_rxq_info *rxq)
210 {
211 }
212 
213 static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
214 {
215 	return 0;
216 }
217 
218 static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
219 				      unsigned long attrs)
220 {
221 }
222 
223 static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
224 				   struct device *dev, unsigned long attrs)
225 {
226 	return 0;
227 }
228 
229 static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
230 {
231 	return 0;
232 }
233 
234 static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
235 {
236 	return 0;
237 }
238 
239 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
240 {
241 	return NULL;
242 }
243 
244 static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
245 {
246 	return 0;
247 }
248 
249 static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
250 {
251 	return false;
252 }
253 
254 static inline void xsk_buff_free(struct xdp_buff *xdp)
255 {
256 }
257 
258 static inline void xsk_buff_discard(struct xdp_buff *xdp)
259 {
260 }
261 
262 static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
263 {
264 }
265 
266 static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
267 					      u64 addr)
268 {
269 	return 0;
270 }
271 
272 static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
273 {
274 	return NULL;
275 }
276 
277 static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
278 {
279 }
280 
281 static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
282 						    dma_addr_t dma,
283 						    size_t size)
284 {
285 }
286 
287 #endif /* CONFIG_XDP_SOCKETS */
288 
289 #endif /* _LINUX_XDP_SOCK_DRV_H */
290