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net: openvswitch: shrink the mask array if necessary

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When creating and inserting flow-mask, if there is no available
flow-mask, we realloc the mask array. When removing flow-mask,
if necessary, we shrink mask array.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Acked-by: William Tu <u9012063@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tonghao Zhang 2019-11-01 22:23:47 +08:00 committed by David S. Miller
parent 4bc63b1b53
commit 1689754de6
1 changed files with 23 additions and 10 deletions
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33
net/openvswitch/flow_table.c
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@ -694,6 +694,23 @@ static struct table_instance *table_instance_expand(struct table_instance *ti,
return table_instance_rehash(ti, ti->n_buckets * 2, ufid);
}
static void tbl_mask_array_delete_mask(struct mask_array *ma,
struct sw_flow_mask *mask)
{
int i;
/* Remove the deleted mask pointers from the array */
for (i = 0; i < ma->max; i++) {
if (mask == ovsl_dereference(ma->masks[i])) {
RCU_INIT_POINTER(ma->masks[i], NULL);
ma->count--;
kfree_rcu(mask, rcu);
return;
}
}
BUG();
}
/* Remove 'mask' from the mask list, if it is not needed any more. */
static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
{
@ -707,18 +724,14 @@ static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
if (!mask->ref_count) {
struct mask_array *ma;
int i;
ma = ovsl_dereference(tbl->mask_array);
for (i = 0; i < ma->max; i++) {
if (mask == ovsl_dereference(ma->masks[i])) {
RCU_INIT_POINTER(ma->masks[i], NULL);
ma->count--;
kfree_rcu(mask, rcu);
return;
}
}
BUG();
tbl_mask_array_delete_mask(ma, mask);
/* Shrink the mask array if necessary. */
if (ma->max >= (MASK_ARRAY_SIZE_MIN * 2) &&
ma->count <= (ma->max / 3))
tbl_mask_array_realloc(tbl, ma->max / 2);
}
}
}