include/linux/drbd_tag_magic.h

   1 #ifndef DRBD_TAG_MAGIC_H
   2 #define DRBD_TAG_MAGIC_H
   3
   4 #define TT_END     0
   5 #define TT_REMOVED 0xE000
   6
   7 /* declare packet_type enums */
   8 enum packet_types {
   9 #define NL_PACKET(name, number, fields) P_ ## name = number,
  10 #define NL_RESPONSE(name, number) P_ ## name = number,
  11 #define NL_INTEGER(pn, pr, member)
  12 #define NL_INT64(pn, pr, member)
  13 #define NL_BIT(pn, pr, member)
  14 #define NL_STRING(pn, pr, member, len)
  15 #include "drbd_nl.h"
  16         P_nl_after_last_packet,
  17 };
  18
  19 /* These struct are used to deduce the size of the tag lists: */
  20 #define NL_PACKET(name, number, fields) \
  21         struct name ## _tag_len_struct { fields };
  22 #define NL_INTEGER(pn, pr, member)              \
  23         int member; int tag_and_len ## member;
  24 #define NL_INT64(pn, pr, member)                \
  25         __u64 member; int tag_and_len ## member;
  26 #define NL_BIT(pn, pr, member)          \
  27         unsigned char member:1; int tag_and_len ## member;
  28 #define NL_STRING(pn, pr, member, len)  \
  29         unsigned char member[len]; int member ## _len; \
  30         int tag_and_len ## member;
  31 #include <linux/drbd_nl.h>
  32
  33 /* declare tag-list-sizes */
  34 static const int tag_list_sizes[] = {
  35 #define NL_PACKET(name, number, fields) 2 fields ,
  36 #define NL_INTEGER(pn, pr, member)      + 4 + 4
  37 #define NL_INT64(pn, pr, member)        + 4 + 8
  38 #define NL_BIT(pn, pr, member)          + 4 + 1
  39 #define NL_STRING(pn, pr, member, len)  + 4 + (len)
  40 #include "drbd_nl.h"
  41 };
  42
  43 /* The two highest bits are used for the tag type */
  44 #define TT_MASK      0xC000
  45 #define TT_INTEGER   0x0000
  46 #define TT_INT64     0x4000
  47 #define TT_BIT       0x8000
  48 #define TT_STRING    0xC000
  49 /* The next bit indicates if processing of the tag is mandatory */
  50 #define T_MANDATORY  0x2000
  51 #define T_MAY_IGNORE 0x0000
  52 #define TN_MASK      0x1fff
  53 /* The remaining 13 bits are used to enumerate the tags */
  54
  55 #define tag_type(T)   ((T) & TT_MASK)
  56 #define tag_number(T) ((T) & TN_MASK)
  57
  58 /* declare tag enums */
  59 #define NL_PACKET(name, number, fields) fields
  60 enum drbd_tags {
  61 #define NL_INTEGER(pn, pr, member)     T_ ## member = pn | TT_INTEGER | pr ,
  62 #define NL_INT64(pn, pr, member)       T_ ## member = pn | TT_INT64   | pr ,
  63 #define NL_BIT(pn, pr, member)         T_ ## member = pn | TT_BIT     | pr ,
  64 #define NL_STRING(pn, pr, member, len) T_ ## member = pn | TT_STRING  | pr ,
  65 #include "drbd_nl.h"
  66 };
  67
  68 struct tag {
  69         const char *name;
  70         int type_n_flags;
  71         int max_len;
  72 };
  73
  74 /* declare tag names */
  75 #define NL_PACKET(name, number, fields) fields
  76 static const struct tag tag_descriptions[] = {
  77 #define NL_INTEGER(pn, pr, member)     [ pn ] = { #member, TT_INTEGER | pr, sizeof(int)   },
  78 #define NL_INT64(pn, pr, member)       [ pn ] = { #member, TT_INT64   | pr, sizeof(__u64) },
  79 #define NL_BIT(pn, pr, member)         [ pn ] = { #member, TT_BIT     | pr, sizeof(int)   },
  80 #define NL_STRING(pn, pr, member, len) [ pn ] = { #member, TT_STRING  | pr, (len)         },
  81 #include "drbd_nl.h"
  82 };
  83
  84 #endif