net/mlx5e: TC, support per action stats

Extend the action stats callback implementation to update stats for actions
that are associated with hw counters.
Note that the callback may be called from tc action utility or from tc
flower. Both apis expect the driver to return the stats difference from
the last update. As such, query the raw counter value and maintain
the diff from the last api call in the tc layer, instead of the fs_core
layer.

Signed-off-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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

@@ -589,7 +589,7 @@ mlx5e_rep_indr_stats_act(struct mlx5e_rep_priv *rpriv,
 
 	act = mlx5e_tc_act_get(fl_act->id, ns_type);
 	if (!act || !act->stats_action)
-		return -EOPNOTSUPP;
+		return mlx5e_tc_fill_action_stats(priv, fl_act);
 
 	return act->stats_action(priv, fl_act);
 }

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

@@ -102,6 +102,9 @@ mlx5e_tc_act_stats_del_flow(struct mlx5e_tc_act_stats_handle *handle,
 	struct mlx5e_tc_act_stats *act_stats;
 	int i;
 
+	if (!flow_flag_test(flow, USE_ACT_STATS))
+		return;
+
 	list_for_each_entry(attr, &flow->attrs, list) {
 		for (i = 0; i < attr->tc_act_cookies_count; i++) {
 			struct rhashtable *ht = &handle->ht;
@@ -130,6 +133,9 @@ mlx5e_tc_act_stats_add_flow(struct mlx5e_tc_act_stats_handle *handle,
 	int err;
 	int i;
 
+	if (!flow_flag_test(flow, USE_ACT_STATS))
+		return 0;
+
 	list_for_each_entry(attr, &flow->attrs, list) {
 		if (attr->counter)
 			curr_counter = attr->counter;
@@ -151,3 +157,41 @@ out_err:
 	mlx5e_tc_act_stats_del_flow(handle, flow);
 	return err;
 }
+
+int
+mlx5e_tc_act_stats_fill_stats(struct mlx5e_tc_act_stats_handle *handle,
+			      struct flow_offload_action *fl_act)
+{
+	struct rhashtable *ht = &handle->ht;
+	struct mlx5e_tc_act_stats *item;
+	struct mlx5e_tc_act_stats key;
+	u64 pkts, bytes, lastused;
+	int err = 0;
+
+	key.tc_act_cookie = fl_act->cookie;
+
+	rcu_read_lock();
+	item = rhashtable_lookup(ht, &key, act_counters_ht_params);
+	if (!item) {
+		rcu_read_unlock();
+		err = -ENOENT;
+		goto err_out;
+	}
+
+	mlx5_fc_query_cached_raw(item->counter,
+				 &bytes, &pkts, &lastused);
+
+	flow_stats_update(&fl_act->stats,
+			  bytes - item->lastbytes,
+			  pkts - item->lastpackets,
+			  0, lastused, FLOW_ACTION_HW_STATS_DELAYED);
+
+	item->lastpackets = pkts;
+	item->lastbytes = bytes;
+	rcu_read_unlock();
+
+	return 0;
+
+err_out:
+	return err;
+}

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

@@ -20,4 +20,8 @@ void
 mlx5e_tc_act_stats_del_flow(struct mlx5e_tc_act_stats_handle *handle,
 			    struct mlx5e_tc_flow *flow);
 
+int
+mlx5e_tc_act_stats_fill_stats(struct mlx5e_tc_act_stats_handle *handle,
+			      struct flow_offload_action *fl_act);
+
 #endif /* __MLX5_EN_ACT_STATS_H__ */

drivers/net/ethernet/mellanox/mlx5/core/en/tc_priv.h

@@ -30,6 +30,7 @@ enum {
 	MLX5E_TC_FLOW_FLAG_TUN_RX                = MLX5E_TC_FLOW_BASE + 9,
 	MLX5E_TC_FLOW_FLAG_FAILED                = MLX5E_TC_FLOW_BASE + 10,
 	MLX5E_TC_FLOW_FLAG_SAMPLE                = MLX5E_TC_FLOW_BASE + 11,
+	MLX5E_TC_FLOW_FLAG_USE_ACT_STATS	 = MLX5E_TC_FLOW_BASE + 12,
 };
 
 struct mlx5e_tc_flow_parse_attr {

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -4117,6 +4117,7 @@ parse_branch_ctrl(struct flow_action_entry *act, struct mlx5e_tc_act *tc_act,
 
 	/* branching action requires its own counter */
 	attr->action |= MLX5_FLOW_CONTEXT_ACTION_COUNT;
+	flow_flag_set(flow, USE_ACT_STATS);
 
 	return 0;
 
@@ -4967,6 +4968,12 @@ errout:
 	return err;
 }
 
+int mlx5e_tc_fill_action_stats(struct mlx5e_priv *priv,
+			       struct flow_offload_action *fl_act)
+{
+	return mlx5e_tc_act_stats_fill_stats(get_act_stats_handle(priv), fl_act);
+}
+
 int mlx5e_stats_flower(struct net_device *dev, struct mlx5e_priv *priv,
 		       struct flow_cls_offload *f, unsigned long flags)
 {
@@ -4993,11 +5000,15 @@ int mlx5e_stats_flower(struct net_device *dev, struct mlx5e_priv *priv,
 	}
 
 	if (mlx5e_is_offloaded_flow(flow) || flow_flag_test(flow, CT)) {
-		counter = mlx5e_tc_get_counter(flow);
-		if (!counter)
-			goto errout;
+		if (flow_flag_test(flow, USE_ACT_STATS)) {
+			f->use_act_stats = true;
+		} else {
+			counter = mlx5e_tc_get_counter(flow);
+			if (!counter)
+				goto errout;
 
-		mlx5_fc_query_cached(counter, &bytes, &packets, &lastuse);
+			mlx5_fc_query_cached(counter, &bytes, &packets, &lastuse);
+		}
 	}
 
 	/* Under multipath it's possible for one rule to be currently
@@ -5013,14 +5024,18 @@ int mlx5e_stats_flower(struct net_device *dev, struct mlx5e_priv *priv,
 		u64 packets2;
 		u64 lastuse2;
 
-		counter = mlx5e_tc_get_counter(flow->peer_flow);
-		if (!counter)
-			goto no_peer_counter;
-		mlx5_fc_query_cached(counter, &bytes2, &packets2, &lastuse2);
+		if (flow_flag_test(flow, USE_ACT_STATS)) {
+			f->use_act_stats = true;
+		} else {
+			counter = mlx5e_tc_get_counter(flow->peer_flow);
+			if (!counter)
+				goto no_peer_counter;
+			mlx5_fc_query_cached(counter, &bytes2, &packets2, &lastuse2);
 
-		bytes += bytes2;
-		packets += packets2;
-		lastuse = max_t(u64, lastuse, lastuse2);
+			bytes += bytes2;
+			packets += packets2;
+			lastuse = max_t(u64, lastuse, lastuse2);
+		}
 	}
 
 no_peer_counter:

drivers/net/ethernet/mellanox/mlx5/core/en_tc.h

@@ -199,6 +199,8 @@ int mlx5e_delete_flower(struct net_device *dev, struct mlx5e_priv *priv,
 
 int mlx5e_stats_flower(struct net_device *dev, struct mlx5e_priv *priv,
 		       struct flow_cls_offload *f, unsigned long flags);
+int mlx5e_tc_fill_action_stats(struct mlx5e_priv *priv,
+			       struct flow_offload_action *fl_act);
 
 int mlx5e_tc_configure_matchall(struct mlx5e_priv *priv,
 				struct tc_cls_matchall_offload *f);

drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c

@@ -504,6 +504,16 @@ void mlx5_fc_query_cached(struct mlx5_fc *counter,
 	counter->lastpackets = c.packets;
 }
 
+void mlx5_fc_query_cached_raw(struct mlx5_fc *counter,
+			      u64 *bytes, u64 *packets, u64 *lastuse)
+{
+	struct mlx5_fc_cache c = counter->cache;
+
+	*bytes = c.bytes;
+	*packets = c.packets;
+	*lastuse = c.lastuse;
+}
+
 void mlx5_fc_queue_stats_work(struct mlx5_core_dev *dev,
 			      struct delayed_work *dwork,
 			      unsigned long delay)

include/linux/mlx5/fs.h

@@ -296,6 +296,8 @@ void mlx5_fc_destroy(struct mlx5_core_dev *dev, struct mlx5_fc *counter);
 u64 mlx5_fc_query_lastuse(struct mlx5_fc *counter);
 void mlx5_fc_query_cached(struct mlx5_fc *counter,
 			  u64 *bytes, u64 *packets, u64 *lastuse);
+void mlx5_fc_query_cached_raw(struct mlx5_fc *counter,
+			      u64 *bytes, u64 *packets, u64 *lastuse);
 int mlx5_fc_query(struct mlx5_core_dev *dev, struct mlx5_fc *counter,
 		  u64 *packets, u64 *bytes);
 u32 mlx5_fc_id(struct mlx5_fc *counter);