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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
de152192 JP |
2 | /* |
3 | * drivers/net/ethernet/rocker/rocker_tlv.h - Rocker switch device driver | |
4 | * Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com> | |
5 | * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com> | |
de152192 JP |
6 | */ |
7 | ||
8 | #ifndef _ROCKER_TLV_H | |
9 | #define _ROCKER_TLV_H | |
10 | ||
11 | #include <linux/types.h> | |
12 | ||
13 | #include "rocker_hw.h" | |
14 | #include "rocker.h" | |
15 | ||
16 | #define ROCKER_TLV_ALIGNTO 8U | |
17 | #define ROCKER_TLV_ALIGN(len) \ | |
18 | (((len) + ROCKER_TLV_ALIGNTO - 1) & ~(ROCKER_TLV_ALIGNTO - 1)) | |
19 | #define ROCKER_TLV_HDRLEN ROCKER_TLV_ALIGN(sizeof(struct rocker_tlv)) | |
20 | ||
21 | /* <------- ROCKER_TLV_HDRLEN -------> <--- ROCKER_TLV_ALIGN(payload) ---> | |
22 | * +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+ | |
23 | * | Header | Pad | Payload | Pad | | |
24 | * | (struct rocker_tlv) | ing | | ing | | |
25 | * +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+ | |
26 | * <--------------------------- tlv->len --------------------------> | |
27 | */ | |
28 | ||
29 | static inline struct rocker_tlv *rocker_tlv_next(const struct rocker_tlv *tlv, | |
30 | int *remaining) | |
31 | { | |
32 | int totlen = ROCKER_TLV_ALIGN(tlv->len); | |
33 | ||
34 | *remaining -= totlen; | |
35 | return (struct rocker_tlv *) ((char *) tlv + totlen); | |
36 | } | |
37 | ||
38 | static inline int rocker_tlv_ok(const struct rocker_tlv *tlv, int remaining) | |
39 | { | |
40 | return remaining >= (int) ROCKER_TLV_HDRLEN && | |
41 | tlv->len >= ROCKER_TLV_HDRLEN && | |
42 | tlv->len <= remaining; | |
43 | } | |
44 | ||
45 | #define rocker_tlv_for_each(pos, head, len, rem) \ | |
46 | for (pos = head, rem = len; \ | |
47 | rocker_tlv_ok(pos, rem); \ | |
48 | pos = rocker_tlv_next(pos, &(rem))) | |
49 | ||
50 | #define rocker_tlv_for_each_nested(pos, tlv, rem) \ | |
51 | rocker_tlv_for_each(pos, rocker_tlv_data(tlv), \ | |
52 | rocker_tlv_len(tlv), rem) | |
53 | ||
54 | static inline int rocker_tlv_attr_size(int payload) | |
55 | { | |
56 | return ROCKER_TLV_HDRLEN + payload; | |
57 | } | |
58 | ||
59 | static inline int rocker_tlv_total_size(int payload) | |
60 | { | |
61 | return ROCKER_TLV_ALIGN(rocker_tlv_attr_size(payload)); | |
62 | } | |
63 | ||
64 | static inline int rocker_tlv_padlen(int payload) | |
65 | { | |
66 | return rocker_tlv_total_size(payload) - rocker_tlv_attr_size(payload); | |
67 | } | |
68 | ||
69 | static inline int rocker_tlv_type(const struct rocker_tlv *tlv) | |
70 | { | |
71 | return tlv->type; | |
72 | } | |
73 | ||
74 | static inline void *rocker_tlv_data(const struct rocker_tlv *tlv) | |
75 | { | |
76 | return (char *) tlv + ROCKER_TLV_HDRLEN; | |
77 | } | |
78 | ||
79 | static inline int rocker_tlv_len(const struct rocker_tlv *tlv) | |
80 | { | |
81 | return tlv->len - ROCKER_TLV_HDRLEN; | |
82 | } | |
83 | ||
84 | static inline u8 rocker_tlv_get_u8(const struct rocker_tlv *tlv) | |
85 | { | |
86 | return *(u8 *) rocker_tlv_data(tlv); | |
87 | } | |
88 | ||
89 | static inline u16 rocker_tlv_get_u16(const struct rocker_tlv *tlv) | |
90 | { | |
91 | return *(u16 *) rocker_tlv_data(tlv); | |
92 | } | |
93 | ||
94 | static inline __be16 rocker_tlv_get_be16(const struct rocker_tlv *tlv) | |
95 | { | |
96 | return *(__be16 *) rocker_tlv_data(tlv); | |
97 | } | |
98 | ||
99 | static inline u32 rocker_tlv_get_u32(const struct rocker_tlv *tlv) | |
100 | { | |
101 | return *(u32 *) rocker_tlv_data(tlv); | |
102 | } | |
103 | ||
104 | static inline u64 rocker_tlv_get_u64(const struct rocker_tlv *tlv) | |
105 | { | |
106 | return *(u64 *) rocker_tlv_data(tlv); | |
107 | } | |
108 | ||
109 | void rocker_tlv_parse(const struct rocker_tlv **tb, int maxtype, | |
110 | const char *buf, int buf_len); | |
111 | ||
112 | static inline void rocker_tlv_parse_nested(const struct rocker_tlv **tb, | |
113 | int maxtype, | |
114 | const struct rocker_tlv *tlv) | |
115 | { | |
116 | rocker_tlv_parse(tb, maxtype, rocker_tlv_data(tlv), | |
117 | rocker_tlv_len(tlv)); | |
118 | } | |
119 | ||
120 | static inline void | |
121 | rocker_tlv_parse_desc(const struct rocker_tlv **tb, int maxtype, | |
122 | const struct rocker_desc_info *desc_info) | |
123 | { | |
124 | rocker_tlv_parse(tb, maxtype, desc_info->data, | |
125 | desc_info->desc->tlv_size); | |
126 | } | |
127 | ||
128 | static inline struct rocker_tlv * | |
129 | rocker_tlv_start(struct rocker_desc_info *desc_info) | |
130 | { | |
131 | return (struct rocker_tlv *) ((char *) desc_info->data + | |
132 | desc_info->tlv_size); | |
133 | } | |
134 | ||
135 | int rocker_tlv_put(struct rocker_desc_info *desc_info, | |
136 | int attrtype, int attrlen, const void *data); | |
137 | ||
6098d7dd AB |
138 | static inline int |
139 | rocker_tlv_put_u8(struct rocker_desc_info *desc_info, int attrtype, u8 value) | |
de152192 | 140 | { |
6098d7dd AB |
141 | u8 tmp = value; /* work around GCC PR81715 */ |
142 | ||
143 | return rocker_tlv_put(desc_info, attrtype, sizeof(u8), &tmp); | |
de152192 JP |
144 | } |
145 | ||
6098d7dd AB |
146 | static inline int |
147 | rocker_tlv_put_u16(struct rocker_desc_info *desc_info, int attrtype, u16 value) | |
de152192 | 148 | { |
6098d7dd AB |
149 | u16 tmp = value; |
150 | ||
151 | return rocker_tlv_put(desc_info, attrtype, sizeof(u16), &tmp); | |
de152192 JP |
152 | } |
153 | ||
6098d7dd AB |
154 | static inline int |
155 | rocker_tlv_put_be16(struct rocker_desc_info *desc_info, int attrtype, __be16 value) | |
de152192 | 156 | { |
6098d7dd AB |
157 | __be16 tmp = value; |
158 | ||
159 | return rocker_tlv_put(desc_info, attrtype, sizeof(__be16), &tmp); | |
de152192 JP |
160 | } |
161 | ||
6098d7dd AB |
162 | static inline int |
163 | rocker_tlv_put_u32(struct rocker_desc_info *desc_info, int attrtype, u32 value) | |
de152192 | 164 | { |
6098d7dd AB |
165 | u32 tmp = value; |
166 | ||
167 | return rocker_tlv_put(desc_info, attrtype, sizeof(u32), &tmp); | |
de152192 JP |
168 | } |
169 | ||
6098d7dd AB |
170 | static inline int |
171 | rocker_tlv_put_be32(struct rocker_desc_info *desc_info, int attrtype, __be32 value) | |
de152192 | 172 | { |
6098d7dd AB |
173 | __be32 tmp = value; |
174 | ||
175 | return rocker_tlv_put(desc_info, attrtype, sizeof(__be32), &tmp); | |
de152192 JP |
176 | } |
177 | ||
6098d7dd AB |
178 | static inline int |
179 | rocker_tlv_put_u64(struct rocker_desc_info *desc_info, int attrtype, u64 value) | |
de152192 | 180 | { |
6098d7dd AB |
181 | u64 tmp = value; |
182 | ||
183 | return rocker_tlv_put(desc_info, attrtype, sizeof(u64), &tmp); | |
de152192 JP |
184 | } |
185 | ||
186 | static inline struct rocker_tlv * | |
187 | rocker_tlv_nest_start(struct rocker_desc_info *desc_info, int attrtype) | |
188 | { | |
189 | struct rocker_tlv *start = rocker_tlv_start(desc_info); | |
190 | ||
191 | if (rocker_tlv_put(desc_info, attrtype, 0, NULL) < 0) | |
192 | return NULL; | |
193 | ||
194 | return start; | |
195 | } | |
196 | ||
197 | static inline void rocker_tlv_nest_end(struct rocker_desc_info *desc_info, | |
198 | struct rocker_tlv *start) | |
199 | { | |
200 | start->len = (char *) rocker_tlv_start(desc_info) - (char *) start; | |
201 | } | |
202 | ||
203 | static inline void rocker_tlv_nest_cancel(struct rocker_desc_info *desc_info, | |
204 | const struct rocker_tlv *start) | |
205 | { | |
206 | desc_info->tlv_size = (const char *) start - desc_info->data; | |
207 | } | |
208 | ||
209 | #endif |