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sfc: Limit filter search depth further for performance hints (i.e. RFS)

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Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2011-01-04 15:22:36 +00:00
parent 69a19ee60d
commit d472605104
1 changed files with 9 additions and 4 deletions
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13
drivers/net/sfc/filter.c
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@ -27,6 +27,10 @@
*/
#define FILTER_CTL_SRCH_MAX 200
/* Don't try very hard to find space for performance hints, as this is
* counter-productive. */
#define FILTER_CTL_SRCH_HINT_MAX 5
enum efx_filter_table_id {
EFX_FILTER_TABLE_RX_IP = 0,
EFX_FILTER_TABLE_RX_MAC,
@ -325,15 +329,16 @@ static int efx_filter_search(struct efx_filter_table *table,
struct efx_filter_spec *spec, u32 key,
bool for_insert, int *depth_required)
{
unsigned hash, incr, filter_idx, depth;
unsigned hash, incr, filter_idx, depth, depth_max;
struct efx_filter_spec *cmp;
hash = efx_filter_hash(key);
incr = efx_filter_increment(key);
depth_max = (spec->priority <= EFX_FILTER_PRI_HINT ?
FILTER_CTL_SRCH_HINT_MAX : FILTER_CTL_SRCH_MAX);
for (depth = 1, filter_idx = hash & (table->size - 1);
depth <= FILTER_CTL_SRCH_MAX &&
test_bit(filter_idx, table->used_bitmap);
depth <= depth_max && test_bit(filter_idx, table->used_bitmap);
++depth) {
cmp = &table->spec[filter_idx];
if (efx_filter_equal(spec, cmp))
@ -342,7 +347,7 @@ static int efx_filter_search(struct efx_filter_table *table,
}
if (!for_insert)
return -ENOENT;
if (depth > FILTER_CTL_SRCH_MAX)
if (depth > depth_max)
return -EBUSY;
found:
*depth_required = depth;