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

 */

#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,

			     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))

	}

	if (!for_insert)

		return -ENOENT;

	if (depth > FILTER_CTL_SRCH_MAX)

	if (depth > depth_max)

		return -EBUSY;

found:

	*depth_required = depth;