diff options
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c index 15d817cbcd9d..92de4b761a83 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c @@ -533,6 +533,70 @@ static void hws_bwc_rule_cnt_dec(struct mlx5hws_bwc_rule *bwc_rule) atomic_dec(&bwc_matcher->tx_size.num_of_rules); } +static int +hws_bwc_matcher_rehash_shrink(struct mlx5hws_bwc_matcher *bwc_matcher) +{ + struct mlx5hws_bwc_matcher_size *rx_size = &bwc_matcher->rx_size; + struct mlx5hws_bwc_matcher_size *tx_size = &bwc_matcher->tx_size; + + /* It is possible that another thread has added a rule. + * Need to check again if we really need rehash/shrink. + */ + if (atomic_read(&rx_size->num_of_rules) || + atomic_read(&tx_size->num_of_rules)) + return 0; + + /* If the current matcher RX/TX size is already at its initial size. */ + if (rx_size->size_log == MLX5HWS_BWC_MATCHER_INIT_SIZE_LOG && + tx_size->size_log == MLX5HWS_BWC_MATCHER_INIT_SIZE_LOG) + return 0; + + /* Now we've done all the checking - do the shrinking: + * - reset match RTC size to the initial size + * - create new matcher + * - move the rules, which will not do anything as the matcher is empty + * - destroy the old matcher + */ + + rx_size->size_log = MLX5HWS_BWC_MATCHER_INIT_SIZE_LOG; + tx_size->size_log = MLX5HWS_BWC_MATCHER_INIT_SIZE_LOG; + + return hws_bwc_matcher_move(bwc_matcher); +} + +static int hws_bwc_rule_cnt_dec_with_shrink(struct mlx5hws_bwc_rule *bwc_rule, + u16 bwc_queue_idx) +{ + struct mlx5hws_bwc_matcher *bwc_matcher = bwc_rule->bwc_matcher; + struct mlx5hws_context *ctx = bwc_matcher->matcher->tbl->ctx; + struct mutex *queue_lock; /* Protect the queue */ + int ret; + + hws_bwc_rule_cnt_dec(bwc_rule); + + if (atomic_read(&bwc_matcher->rx_size.num_of_rules) || + atomic_read(&bwc_matcher->tx_size.num_of_rules)) + return 0; + + /* Matcher has no more rules - shrink it to save ICM. */ + + queue_lock = hws_bwc_get_queue_lock(ctx, bwc_queue_idx); + mutex_unlock(queue_lock); + + hws_bwc_lock_all_queues(ctx); + ret = hws_bwc_matcher_rehash_shrink(bwc_matcher); + hws_bwc_unlock_all_queues(ctx); + + mutex_lock(queue_lock); + + if (unlikely(ret)) + mlx5hws_err(ctx, + "BWC rule deletion: shrinking empty matcher failed (%d)\n", + ret); + + return ret; +} + int mlx5hws_bwc_rule_destroy_simple(struct mlx5hws_bwc_rule *bwc_rule) { struct mlx5hws_bwc_matcher *bwc_matcher = bwc_rule->bwc_matcher; @@ -549,8 +613,8 @@ int mlx5hws_bwc_rule_destroy_simple(struct mlx5hws_bwc_rule *bwc_rule) mutex_lock(queue_lock); ret = hws_bwc_rule_destroy_hws_sync(bwc_rule, &attr); - hws_bwc_rule_cnt_dec(bwc_rule); hws_bwc_rule_list_remove(bwc_rule); + hws_bwc_rule_cnt_dec_with_shrink(bwc_rule, idx); mutex_unlock(queue_lock); |