1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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> |
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, buf: rocker_tlv_data(tlv), |
117 | buf_len: 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, buf: desc_info->data, |
125 | buf_len: 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 | |
138 | static inline int |
139 | rocker_tlv_put_u8(struct rocker_desc_info *desc_info, int attrtype, u8 value) |
140 | { |
141 | u8 tmp = value; /* work around GCC PR81715 */ |
142 | |
143 | return rocker_tlv_put(desc_info, attrtype, attrlen: sizeof(u8), data: &tmp); |
144 | } |
145 | |
146 | static inline int |
147 | rocker_tlv_put_u16(struct rocker_desc_info *desc_info, int attrtype, u16 value) |
148 | { |
149 | u16 tmp = value; |
150 | |
151 | return rocker_tlv_put(desc_info, attrtype, attrlen: sizeof(u16), data: &tmp); |
152 | } |
153 | |
154 | static inline int |
155 | rocker_tlv_put_be16(struct rocker_desc_info *desc_info, int attrtype, __be16 value) |
156 | { |
157 | __be16 tmp = value; |
158 | |
159 | return rocker_tlv_put(desc_info, attrtype, attrlen: sizeof(__be16), data: &tmp); |
160 | } |
161 | |
162 | static inline int |
163 | rocker_tlv_put_u32(struct rocker_desc_info *desc_info, int attrtype, u32 value) |
164 | { |
165 | u32 tmp = value; |
166 | |
167 | return rocker_tlv_put(desc_info, attrtype, attrlen: sizeof(u32), data: &tmp); |
168 | } |
169 | |
170 | static inline int |
171 | rocker_tlv_put_be32(struct rocker_desc_info *desc_info, int attrtype, __be32 value) |
172 | { |
173 | __be32 tmp = value; |
174 | |
175 | return rocker_tlv_put(desc_info, attrtype, attrlen: sizeof(__be32), data: &tmp); |
176 | } |
177 | |
178 | static inline int |
179 | rocker_tlv_put_u64(struct rocker_desc_info *desc_info, int attrtype, u64 value) |
180 | { |
181 | u64 tmp = value; |
182 | |
183 | return rocker_tlv_put(desc_info, attrtype, attrlen: sizeof(u64), data: &tmp); |
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, attrlen: 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 |
210 | |