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ha: Improve distribution of pool addresses over segments

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This is particularly important for higher number of segments, but even
with small numbers there is a significant difference.  For instance,
with 4 segments the fourth segment had no IPs assigned with the old
code, no matter how large the pool, because none of the eight bits used
for the segment check hashed/mapped to it.
This commit is contained in:
Tobias Brunner 2018-11-20 12:50:05 +01:00
parent 872b9b3e8d
commit a8f91cd466
1 changed files with 7 additions and 6 deletions
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13
src/libcharon/plugins/ha/ha_attribute.c
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@ -159,13 +159,13 @@ static pool_t* get_pool(private_ha_attribute_t *this, char *name)
}
/**
* Check if we are responsible for a bit in our bitmask
* Check if we are responsible for an offset
*/
static bool responsible_for(private_ha_attribute_t *this, int bit)
static bool responsible_for(private_ha_attribute_t *this, int offset)
{
u_int segment;
segment = this->kernel->get_segment_int(this->kernel, bit);
segment = this->kernel->get_segment_int(this->kernel, offset);
return this->segments->is_active(this->segments, segment);
}
@ -175,7 +175,7 @@ METHOD(attribute_provider_t, acquire_address, host_t*,
{
enumerator_t *enumerator;
pool_t *pool = NULL;
int offset = -1, byte, bit;
int offset = -1, tmp_offset, byte, bit;
host_t *address;
char *name;
@ -199,10 +199,11 @@ METHOD(attribute_provider_t, acquire_address, host_t*,
{
for (bit = 0; bit < 8; bit++)
{
tmp_offset = byte * 8 + bit;
if (!(pool->mask[byte] & 1 << bit) &&
responsible_for(this, bit))
responsible_for(this, tmp_offset))
{
offset = byte * 8 + bit;
offset = tmp_offset;
pool->mask[byte] |= 1 << bit;
break;
}