drivers/net/ethernet/rocker/rocker_tlv.h

   1 /*
   2  * drivers/net/ethernet/rocker/rocker_tlv.h - Rocker switch device driver
   3  * Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com>
   4  * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #ifndef _ROCKER_TLV_H
  13 #define _ROCKER_TLV_H
  14
  15 #include <linux/types.h>
  16
  17 #include "rocker_hw.h"
  18 #include "rocker.h"
  19
  20 #define ROCKER_TLV_ALIGNTO 8U
  21 #define ROCKER_TLV_ALIGN(len) \
  22         (((len) + ROCKER_TLV_ALIGNTO - 1) & ~(ROCKER_TLV_ALIGNTO - 1))
  23 #define ROCKER_TLV_HDRLEN ROCKER_TLV_ALIGN(sizeof(struct rocker_tlv))
  24
  25 /*  <------- ROCKER_TLV_HDRLEN -------> <--- ROCKER_TLV_ALIGN(payload) --->
  26  * +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+
  27  * |             Header          | Pad |           Payload           | Pad |
  28  * |      (struct rocker_tlv)    | ing |                             | ing |
  29  * +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+
  30  *  <--------------------------- tlv->len -------------------------->
  31  */
  32
  33 static inline struct rocker_tlv *rocker_tlv_next(const struct rocker_tlv *tlv,
  34                                                  int *remaining)
  35 {
  36         int totlen = ROCKER_TLV_ALIGN(tlv->len);
  37
  38         *remaining -= totlen;
  39         return (struct rocker_tlv *) ((char *) tlv + totlen);
  40 }
  41
  42 static inline int rocker_tlv_ok(const struct rocker_tlv *tlv, int remaining)
  43 {
  44         return remaining >= (int) ROCKER_TLV_HDRLEN &&
  45                tlv->len >= ROCKER_TLV_HDRLEN &&
  46                tlv->len <= remaining;
  47 }
  48
  49 #define rocker_tlv_for_each(pos, head, len, rem)        \
  50         for (pos = head, rem = len;                     \
  51              rocker_tlv_ok(pos, rem);                   \
  52              pos = rocker_tlv_next(pos, &(rem)))
  53
  54 #define rocker_tlv_for_each_nested(pos, tlv, rem)       \
  55         rocker_tlv_for_each(pos, rocker_tlv_data(tlv),  \
  56                             rocker_tlv_len(tlv), rem)
  57
  58 static inline int rocker_tlv_attr_size(int payload)
  59 {
  60         return ROCKER_TLV_HDRLEN + payload;
  61 }
  62
  63 static inline int rocker_tlv_total_size(int payload)
  64 {
  65         return ROCKER_TLV_ALIGN(rocker_tlv_attr_size(payload));
  66 }
  67
  68 static inline int rocker_tlv_padlen(int payload)
  69 {
  70         return rocker_tlv_total_size(payload) - rocker_tlv_attr_size(payload);
  71 }
  72
  73 static inline int rocker_tlv_type(const struct rocker_tlv *tlv)
  74 {
  75         return tlv->type;
  76 }
  77
  78 static inline void *rocker_tlv_data(const struct rocker_tlv *tlv)
  79 {
  80         return (char *) tlv + ROCKER_TLV_HDRLEN;
  81 }
  82
  83 static inline int rocker_tlv_len(const struct rocker_tlv *tlv)
  84 {
  85         return tlv->len - ROCKER_TLV_HDRLEN;
  86 }
  87
  88 static inline u8 rocker_tlv_get_u8(const struct rocker_tlv *tlv)
  89 {
  90         return *(u8 *) rocker_tlv_data(tlv);
  91 }
  92
  93 static inline u16 rocker_tlv_get_u16(const struct rocker_tlv *tlv)
  94 {
  95         return *(u16 *) rocker_tlv_data(tlv);
  96 }
  97
  98 static inline __be16 rocker_tlv_get_be16(const struct rocker_tlv *tlv)
  99 {
 100         return *(__be16 *) rocker_tlv_data(tlv);
 101 }
 102
 103 static inline u32 rocker_tlv_get_u32(const struct rocker_tlv *tlv)
 104 {
 105         return *(u32 *) rocker_tlv_data(tlv);
 106 }
 107
 108 static inline u64 rocker_tlv_get_u64(const struct rocker_tlv *tlv)
 109 {
 110         return *(u64 *) rocker_tlv_data(tlv);
 111 }
 112
 113 void rocker_tlv_parse(const struct rocker_tlv **tb, int maxtype,
 114                       const char *buf, int buf_len);
 115
 116 static inline void rocker_tlv_parse_nested(const struct rocker_tlv **tb,
 117                                            int maxtype,
 118                                            const struct rocker_tlv *tlv)
 119 {
 120         rocker_tlv_parse(tb, maxtype, rocker_tlv_data(tlv),
 121                          rocker_tlv_len(tlv));
 122 }
 123
 124 static inline void
 125 rocker_tlv_parse_desc(const struct rocker_tlv **tb, int maxtype,
 126                       const struct rocker_desc_info *desc_info)
 127 {
 128         rocker_tlv_parse(tb, maxtype, desc_info->data,
 129                          desc_info->desc->tlv_size);
 130 }
 131
 132 static inline struct rocker_tlv *
 133 rocker_tlv_start(struct rocker_desc_info *desc_info)
 134 {
 135         return (struct rocker_tlv *) ((char *) desc_info->data +
 136                                                desc_info->tlv_size);
 137 }
 138
 139 int rocker_tlv_put(struct rocker_desc_info *desc_info,
 140                    int attrtype, int attrlen, const void *data);
 141
 142 static inline int
 143 rocker_tlv_put_u8(struct rocker_desc_info *desc_info, int attrtype, u8 value)
 144 {
 145         u8 tmp = value; /* work around GCC PR81715 */
 146
 147         return rocker_tlv_put(desc_info, attrtype, sizeof(u8), &tmp);
 148 }
 149
 150 static inline int
 151 rocker_tlv_put_u16(struct rocker_desc_info *desc_info, int attrtype, u16 value)
 152 {
 153         u16 tmp = value;
 154
 155         return rocker_tlv_put(desc_info, attrtype, sizeof(u16), &tmp);
 156 }
 157
 158 static inline int
 159 rocker_tlv_put_be16(struct rocker_desc_info *desc_info, int attrtype, __be16 value)
 160 {
 161         __be16 tmp = value;
 162
 163         return rocker_tlv_put(desc_info, attrtype, sizeof(__be16), &tmp);
 164 }
 165
 166 static inline int
 167 rocker_tlv_put_u32(struct rocker_desc_info *desc_info, int attrtype, u32 value)
 168 {
 169         u32 tmp = value;
 170
 171         return rocker_tlv_put(desc_info, attrtype, sizeof(u32), &tmp);
 172 }
 173
 174 static inline int
 175 rocker_tlv_put_be32(struct rocker_desc_info *desc_info, int attrtype, __be32 value)
 176 {
 177         __be32 tmp = value;
 178
 179         return rocker_tlv_put(desc_info, attrtype, sizeof(__be32), &tmp);
 180 }
 181
 182 static inline int
 183 rocker_tlv_put_u64(struct rocker_desc_info *desc_info, int attrtype, u64 value)
 184 {
 185         u64 tmp = value;
 186
 187         return rocker_tlv_put(desc_info, attrtype, sizeof(u64), &tmp);
 188 }
 189
 190 static inline struct rocker_tlv *
 191 rocker_tlv_nest_start(struct rocker_desc_info *desc_info, int attrtype)
 192 {
 193         struct rocker_tlv *start = rocker_tlv_start(desc_info);
 194
 195         if (rocker_tlv_put(desc_info, attrtype, 0, NULL) < 0)
 196                 return NULL;
 197
 198         return start;
 199 }
 200
 201 static inline void rocker_tlv_nest_end(struct rocker_desc_info *desc_info,
 202                                        struct rocker_tlv *start)
 203 {
 204         start->len = (char *) rocker_tlv_start(desc_info) - (char *) start;
 205 }
 206
 207 static inline void rocker_tlv_nest_cancel(struct rocker_desc_info *desc_info,
 208                                           const struct rocker_tlv *start)
 209 {
 210         desc_info->tlv_size = (const char *) start - desc_info->data;
 211 }
 212
 213 #endif