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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/* AF_XDP internal functions
3 * Copyright(c) 2018 Intel Corporation.
4 */
5
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 struct pid *pid;
40 unsigned long address;
41 refcount_t users;
42 struct work_struct work;
43 struct page **pgs;
44 u32 npgs;
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 /* struct sock must be the first member of struct xdp_sock */
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 struct xsk_queue *tx ____cacheline_aligned_in_smp;
62 struct list_head list;
63 bool zc;
64 /* Protects multiple processes in the control path */
65 struct mutex mutex;
66 /* Mutual exclusion of NAPI TX thread and sendmsg error paths
67 * in the SKB destructor callback.
68 */
69 spinlock_t tx_completion_lock;
70 u64 rx_dropped;
71};
72
73struct xdp_buff;
74#ifdef CONFIG_XDP_SOCKETS
75int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
76int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
77void xsk_flush(struct xdp_sock *xs);
78bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs);
79/* Used from netdev driver */
80u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr);
81void xsk_umem_discard_addr(struct xdp_umem *umem);
82void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries);
83bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len);
84void xsk_umem_consume_tx_done(struct xdp_umem *umem);
85struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries);
86struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem,
87 struct xdp_umem_fq_reuse *newq);
88void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq);
89struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id);
90
91static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
92{
93 return umem->pages[addr >> PAGE_SHIFT].addr + (addr & (PAGE_SIZE - 1));
94}
95
96static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
97{
98 return umem->pages[addr >> PAGE_SHIFT].dma + (addr & (PAGE_SIZE - 1));
99}
100
101/* Reuse-queue aware version of FILL queue helpers */
102static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
103{
104 struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
105
106 if (!rq->length)
107 return xsk_umem_peek_addr(umem, addr);
108
109 *addr = rq->handles[rq->length - 1];
110 return addr;
111}
112
113static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem)
114{
115 struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
116
117 if (!rq->length)
118 xsk_umem_discard_addr(umem);
119 else
120 rq->length--;
121}
122
123static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
124{
125 struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
126
127 rq->handles[rq->length++] = addr;
128}
129#else
130static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
131{
132 return -ENOTSUPP;
133}
134
135static inline int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
136{
137 return -ENOTSUPP;
138}
139
140static inline void xsk_flush(struct xdp_sock *xs)
141{
142}
143
144static inline bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
145{
146 return false;
147}
148
149static inline u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr)
150{
151 return NULL;
152}
153
154static inline void xsk_umem_discard_addr(struct xdp_umem *umem)
155{
156}
157
158static inline void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries)
159{
160}
161
162static inline bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma,
163 u32 *len)
164{
165 return false;
166}
167
168static inline void xsk_umem_consume_tx_done(struct xdp_umem *umem)
169{
170}
171
172static inline struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries)
173{
174 return NULL;
175}
176
177static inline struct xdp_umem_fq_reuse *xsk_reuseq_swap(
178 struct xdp_umem *umem,
179 struct xdp_umem_fq_reuse *newq)
180{
181 return NULL;
182}
183static inline void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq)
184{
185}
186
187static inline struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
188 u16 queue_id)
189{
190 return NULL;
191}
192
193static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
194{
195 return NULL;
196}
197
198static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
199{
200 return 0;
201}
202
203static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
204{
205 return NULL;
206}
207
208static inline void xsk_umem_discard_addr_rq(struct xdp_umem *umem)
209{
210}
211
212static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
213{
214}
215
216#endif /* CONFIG_XDP_SOCKETS */
217
218#endif /* _LINUX_XDP_SOCK_H */