net/mlx5e: Remove optimization which prevented update of ESN state

aso->use_cache variable introduced in commit 8c582ddf ("net/mlx5e: Handle
hardware IPsec limits events") was an optimization to skip recurrent calls
to mlx5e_ipsec_aso_query(). Such calls are possible when lifetime event is
generated:
 -> mlx5e_ipsec_handle_event()
  -> mlx5e_ipsec_aso_query() - first call
  -> xfrm_state_check_expire()
   -> mlx5e_xfrm_update_curlft()
    -> mlx5e_ipsec_aso_query() - second call

However, such optimization not really effective as mlx5e_ipsec_aso_query()
is needed to be called for update ESN anyway, which was missed due to misplaced
use_cache assignment.

Fixes: cee137a6 ("net/mlx5e: Handle ESN update events")
Reviewed-by: Jianbo Liu <jianbol@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h

@@ -122,11 +122,6 @@ struct mlx5e_ipsec_aso {
 	u8 ctx[MLX5_ST_SZ_BYTES(ipsec_aso)];
 	dma_addr_t dma_addr;
 	struct mlx5_aso *aso;
-	/* IPsec ASO caches data on every query call,
-	 * so in nested calls, we can use this boolean to save
-	 * recursive calls to mlx5e_ipsec_aso_query()
-	 */
-	u8 use_cache : 1;
 };
 
 struct mlx5e_ipsec {

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c

@@ -320,7 +320,6 @@ static void mlx5e_ipsec_handle_event(struct work_struct *_work)
 	if (ret)
 		goto unlock;
 
-	aso->use_cache = true;
 	if (attrs->esn_trigger &&
 	    !MLX5_GET(ipsec_aso, aso->ctx, esn_event_arm)) {
 		u32 mode_param = MLX5_GET(ipsec_aso, aso->ctx, mode_parameter);
@@ -333,7 +332,6 @@ static void mlx5e_ipsec_handle_event(struct work_struct *_work)
 		    !MLX5_GET(ipsec_aso, aso->ctx, hard_lft_arm) ||
 		    !MLX5_GET(ipsec_aso, aso->ctx, remove_flow_enable))
 			xfrm_state_check_expire(sa_entry->x);
-	aso->use_cache = false;
 
 unlock:
 	spin_unlock(&sa_entry->x->lock);
@@ -458,9 +456,6 @@ int mlx5e_ipsec_aso_query(struct mlx5e_ipsec_sa_entry *sa_entry,
 	u8 ds_cnt;
 
 	lockdep_assert_held(&sa_entry->x->lock);
-	if (aso->use_cache)
-		return 0;
-
 	res = &mdev->mlx5e_res.hw_objs;
 
 	memset(aso->ctx, 0, sizeof(aso->ctx));