42ff269d10
In case we ever should add an other packet type, we must not reuse 27, as that currently used for "empty" return code only replies. Document it as such. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
#ifndef DRBD_TAG_MAGIC_H
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#define DRBD_TAG_MAGIC_H
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#define TT_END 0
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#define TT_REMOVED 0xE000
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/* declare packet_type enums */
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enum packet_types {
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#define NL_PACKET(name, number, fields) P_ ## name = number,
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#define NL_RESPONSE(name, number) P_ ## name = number,
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#define NL_INTEGER(pn, pr, member)
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#define NL_INT64(pn, pr, member)
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#define NL_BIT(pn, pr, member)
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#define NL_STRING(pn, pr, member, len)
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#include "drbd_nl.h"
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P_nl_after_last_packet,
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};
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/* These struct are used to deduce the size of the tag lists: */
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#define NL_PACKET(name, number, fields) \
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struct name ## _tag_len_struct { fields };
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#define NL_INTEGER(pn, pr, member) \
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int member; int tag_and_len ## member;
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#define NL_INT64(pn, pr, member) \
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__u64 member; int tag_and_len ## member;
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#define NL_BIT(pn, pr, member) \
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unsigned char member:1; int tag_and_len ## member;
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#define NL_STRING(pn, pr, member, len) \
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unsigned char member[len]; int member ## _len; \
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int tag_and_len ## member;
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#include "linux/drbd_nl.h"
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/* declate tag-list-sizes */
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static const int tag_list_sizes[] = {
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#define NL_PACKET(name, number, fields) 2 fields ,
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#define NL_INTEGER(pn, pr, member) + 4 + 4
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#define NL_INT64(pn, pr, member) + 4 + 8
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#define NL_BIT(pn, pr, member) + 4 + 1
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#define NL_STRING(pn, pr, member, len) + 4 + (len)
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#include "drbd_nl.h"
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};
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/* The two highest bits are used for the tag type */
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#define TT_MASK 0xC000
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#define TT_INTEGER 0x0000
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#define TT_INT64 0x4000
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#define TT_BIT 0x8000
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#define TT_STRING 0xC000
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/* The next bit indicates if processing of the tag is mandatory */
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#define T_MANDATORY 0x2000
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#define T_MAY_IGNORE 0x0000
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#define TN_MASK 0x1fff
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/* The remaining 13 bits are used to enumerate the tags */
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#define tag_type(T) ((T) & TT_MASK)
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#define tag_number(T) ((T) & TN_MASK)
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/* declare tag enums */
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#define NL_PACKET(name, number, fields) fields
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enum drbd_tags {
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#define NL_INTEGER(pn, pr, member) T_ ## member = pn | TT_INTEGER | pr ,
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#define NL_INT64(pn, pr, member) T_ ## member = pn | TT_INT64 | pr ,
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#define NL_BIT(pn, pr, member) T_ ## member = pn | TT_BIT | pr ,
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#define NL_STRING(pn, pr, member, len) T_ ## member = pn | TT_STRING | pr ,
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#include "drbd_nl.h"
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};
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struct tag {
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const char *name;
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int type_n_flags;
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int max_len;
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};
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/* declare tag names */
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#define NL_PACKET(name, number, fields) fields
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static const struct tag tag_descriptions[] = {
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#define NL_INTEGER(pn, pr, member) [ pn ] = { #member, TT_INTEGER | pr, sizeof(int) },
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#define NL_INT64(pn, pr, member) [ pn ] = { #member, TT_INT64 | pr, sizeof(__u64) },
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#define NL_BIT(pn, pr, member) [ pn ] = { #member, TT_BIT | pr, sizeof(int) },
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#define NL_STRING(pn, pr, member, len) [ pn ] = { #member, TT_STRING | pr, (len) },
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#include "drbd_nl.h"
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};
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#endif
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