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MINOR: htx: Use a macro for overhead induced by HTX

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The overhead induced by the HTX format was set to the HTX structure itself
and two HTX blocks. It was set this way to optimize zero-copy during
transfers. This value may (and will) be used at different places. Thus we
now use a macro, called HTX_BUF_OVERHEAD.
This commit is contained in:
Christopher Faulet 2023-11-17 10:52:36 +01:00
parent b68c579eda
commit 7393bf7e42
2 changed files with 8 additions and 2 deletions
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6
include/haproxy/htx-t.h
View File

@ -164,6 +164,12 @@ static forceinline char *hsl_show_flags(char *buf, size_t len, const char *delim
#undef _
}
/* Overhead induced by HTX on buffers during transfers. In addition to the size
* of the HTX structure itself, and meta data for one block, another block is
* accounted to favored zero-copy xfer.
*/
#define HTX_BUF_OVERHEAD (sizeof(struct htx) + 2 * sizeof(struct htx_blk))
/* HTX flags.
* Please also update the htx_show_flags() function below in case of changes.
*/

4
include/haproxy/htx.h
View File

@ -673,10 +673,10 @@ static inline size_t buf_room_for_htx_data(const struct buffer *buf)
size_t room;
room = b_room(buf);
if (room <= sizeof(struct htx) + 2 * sizeof(struct htx_blk))
if (room <= HTX_BUF_OVERHEAD)
room = 0;
else
room -= sizeof(struct htx) + 2 * sizeof(struct htx_blk);
room -= HTX_BUF_OVERHEAD;
return room;
}