net/sched: TC, fix raw counter initialization

Freed counters may be reused by fs core.
As such, raw counters may not be initialized to zero.

Cache the counter values when the action stats object is initialized to
have a proper base value for calculating the difference from the previous
query.

Fixes: 2b68d65 ("net/mlx5e: TC, support per action stats")
Signed-off-by: Oz Shlomo <[email protected]>
Reviewed-by: Paul Blakey <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: ozshlomo

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act_stats.c

@@ -64,6 +64,7 @@ mlx5e_tc_act_stats_add(struct mlx5e_tc_act_stats_handle *handle,
 {
 	struct mlx5e_tc_act_stats *act_stats, *old_act_stats;
 	struct rhashtable *ht = &handle->ht;
+	u64 lastused;
 	int err = 0;
 
 	act_stats = kvzalloc(sizeof(*act_stats), GFP_KERNEL);
@@ -73,6 +74,10 @@ mlx5e_tc_act_stats_add(struct mlx5e_tc_act_stats_handle *handle,
 	act_stats->tc_act_cookie = act_cookie;
 	act_stats->counter = counter;
 
+	mlx5_fc_query_cached_raw(counter,
+				 &act_stats->lastbytes,
+				 &act_stats->lastpackets, &lastused);
+
 	rcu_read_lock();
 	old_act_stats = rhashtable_lookup_get_insert_fast(ht,
 							  &act_stats->hash,