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