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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
---|---|
2 | /* |
3 | * Copyright (c) 2020, Oracle and/or its affiliates |
4 | */ |
5 | |
6 | #ifndef SVC_RDMA_PCL_H |
7 | #define SVC_RDMA_PCL_H |
8 | |
9 | #include <linux/list.h> |
10 | |
11 | struct svc_rdma_segment { |
12 | u32 rs_handle; |
13 | u32 rs_length; |
14 | u64 rs_offset; |
15 | }; |
16 | |
17 | struct svc_rdma_chunk { |
18 | struct list_head ch_list; |
19 | |
20 | u32 ch_position; |
21 | u32 ch_length; |
22 | u32 ch_payload_length; |
23 | |
24 | u32 ch_segcount; |
25 | struct svc_rdma_segment ch_segments[]; |
26 | }; |
27 | |
28 | struct svc_rdma_pcl { |
29 | unsigned int cl_count; |
30 | struct list_head cl_chunks; |
31 | }; |
32 | |
33 | /** |
34 | * pcl_init - Initialize a parsed chunk list |
35 | * @pcl: parsed chunk list to initialize |
36 | * |
37 | */ |
38 | static inline void pcl_init(struct svc_rdma_pcl *pcl) |
39 | { |
40 | INIT_LIST_HEAD(&pcl->cl_chunks); |
41 | } |
42 | |
43 | /** |
44 | * pcl_is_empty - Return true if parsed chunk list is empty |
45 | * @pcl: parsed chunk list |
46 | * |
47 | */ |
48 | static inline bool pcl_is_empty(const struct svc_rdma_pcl *pcl) |
49 | { |
50 | return list_empty(&pcl->cl_chunks); |
51 | } |
52 | |
53 | /** |
54 | * pcl_first_chunk - Return first chunk in a parsed chunk list |
55 | * @pcl: parsed chunk list |
56 | * |
57 | * Returns the first chunk in the list, or NULL if the list is empty. |
58 | */ |
59 | static inline struct svc_rdma_chunk * |
60 | pcl_first_chunk(const struct svc_rdma_pcl *pcl) |
61 | { |
62 | if (pcl_is_empty(pcl)) |
63 | return NULL; |
64 | return list_first_entry(&pcl->cl_chunks, struct svc_rdma_chunk, |
65 | ch_list); |
66 | } |
67 | |
68 | /** |
69 | * pcl_next_chunk - Return next chunk in a parsed chunk list |
70 | * @pcl: a parsed chunk list |
71 | * @chunk: chunk in @pcl |
72 | * |
73 | * Returns the next chunk in the list, or NULL if @chunk is already last. |
74 | */ |
75 | static inline struct svc_rdma_chunk * |
76 | pcl_next_chunk(const struct svc_rdma_pcl *pcl, struct svc_rdma_chunk *chunk) |
77 | { |
78 | if (list_is_last(&chunk->ch_list, &pcl->cl_chunks)) |
79 | return NULL; |
80 | return list_next_entry(chunk, ch_list); |
81 | } |
82 | |
83 | /** |
84 | * pcl_for_each_chunk - Iterate over chunks in a parsed chunk list |
85 | * @pos: the loop cursor |
86 | * @pcl: a parsed chunk list |
87 | */ |
88 | #define pcl_for_each_chunk(pos, pcl) \ |
89 | for (pos = list_first_entry(&(pcl)->cl_chunks, struct svc_rdma_chunk, ch_list); \ |
90 | &pos->ch_list != &(pcl)->cl_chunks; \ |
91 | pos = list_next_entry(pos, ch_list)) |
92 | |
93 | /** |
94 | * pcl_for_each_segment - Iterate over segments in a parsed chunk |
95 | * @pos: the loop cursor |
96 | * @chunk: a parsed chunk |
97 | */ |
98 | #define pcl_for_each_segment(pos, chunk) \ |
99 | for (pos = &(chunk)->ch_segments[0]; \ |
100 | pos <= &(chunk)->ch_segments[(chunk)->ch_segcount - 1]; \ |
101 | pos++) |
102 | |
103 | /** |
104 | * pcl_chunk_end_offset - Return offset of byte range following @chunk |
105 | * @chunk: chunk in @pcl |
106 | * |
107 | * Returns starting offset of the region just after @chunk |
108 | */ |
109 | static inline unsigned int |
110 | pcl_chunk_end_offset(const struct svc_rdma_chunk *chunk) |
111 | { |
112 | return xdr_align_size(chunk->ch_position + chunk->ch_payload_length); |
113 | } |
114 | |
115 | struct svc_rdma_recv_ctxt; |
116 | |
117 | extern void pcl_free(struct svc_rdma_pcl *pcl); |
118 | extern bool pcl_alloc_call(struct svc_rdma_recv_ctxt *rctxt, __be32 *p); |
119 | extern bool pcl_alloc_read(struct svc_rdma_recv_ctxt *rctxt, __be32 *p); |
120 | extern bool pcl_alloc_write(struct svc_rdma_recv_ctxt *rctxt, |
121 | struct svc_rdma_pcl *pcl, __be32 *p); |
122 | extern int pcl_process_nonpayloads(const struct svc_rdma_pcl *pcl, |
123 | const struct xdr_buf *xdr, |
124 | int (*actor)(const struct xdr_buf *, |
125 | void *), |
126 | void *data); |
127 | |
128 | #endif /* SVC_RDMA_PCL_H */ |
129 |
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