mlxsw: span: Remove span_entry by span_id

Instead of removing span_entry by the port number, allow removing by
SPAN id. That simplifies some code right here, and for mirroring to soft
netdevices, avoids problems with netdevice pointer invalidation and
reuse.

Rename mlxsw_sp_span_entry_find() to mlxsw_sp_span_entry_find_by_port()
and keep it--follow-up patches will make use of it.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c

 /*
  * drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c
- * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017, 2018 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -838,7 +838,6 @@ struct mlxsw_afa_mirror {
 	struct mlxsw_afa_resource resource;
 	int span_id;
 	u8 local_in_port;
-	u8 local_out_port;
 	bool ingress;
 };
 
@@ -848,7 +847,7 @@ mlxsw_afa_mirror_destroy(struct mlxsw_afa_block *block,
 {
 	block->afa->ops->mirror_del(block->afa->ops_priv,
 				    mirror->local_in_port,
-				    mirror->local_out_port,
+				    mirror->span_id,
 				    mirror->ingress);
 	kfree(mirror);
 }
@@ -882,7 +881,6 @@ mlxsw_afa_mirror_create(struct mlxsw_afa_block *block,
 		goto err_mirror_add;
 
 	mirror->ingress = ingress;
-	mirror->local_out_port = local_out_port;
 	mirror->local_in_port = local_in_port;
 	mirror->resource.destructor = mlxsw_afa_mirror_destructor;
 	mlxsw_afa_resource_add(block, &mirror->resource);

drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.h

@@ -50,7 +50,7 @@ struct mlxsw_afa_ops {
 	void (*counter_index_put)(void *priv, unsigned int counter_index);
 	int (*mirror_add)(void *priv, u8 locol_in_port, u8 local_out_port,
 			  bool ingress, int *p_span_id);
-	void (*mirror_del)(void *priv, u8 locol_in_port, u8 local_out_port,
+	void (*mirror_del)(void *priv, u8 local_in_port, int span_id,
 			   bool ingress);
 };
 

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -1273,11 +1273,10 @@ mlxsw_sp_port_add_cls_matchall_mirror(struct mlxsw_sp_port *mlxsw_sp_port,
 	}
 	to_port = netdev_priv(to_dev);
 
-	mirror->to_local_port = to_port->local_port;
 	mirror->ingress = ingress;
 	span_type = ingress ? MLXSW_SP_SPAN_INGRESS : MLXSW_SP_SPAN_EGRESS;
 	return mlxsw_sp_span_mirror_add(mlxsw_sp_port, to_port, span_type,
-					true);
+					true, &mirror->span_id);
 }
 
 static void
@@ -1288,7 +1287,7 @@ mlxsw_sp_port_del_cls_matchall_mirror(struct mlxsw_sp_port *mlxsw_sp_port,
 
 	span_type = mirror->ingress ?
 			MLXSW_SP_SPAN_INGRESS : MLXSW_SP_SPAN_EGRESS;
-	mlxsw_sp_span_mirror_del(mlxsw_sp_port, mirror->to_local_port,
+	mlxsw_sp_span_mirror_del(mlxsw_sp_port, mirror->span_id,
 				 span_type, true);
 }
 

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -124,7 +124,7 @@ enum mlxsw_sp_port_mall_action_type {
 };
 
 struct mlxsw_sp_port_mall_mirror_tc_entry {
-	u8 to_local_port;
+	int span_id;
 	bool ingress;
 };
 

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_actions.c

 /*
  * drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_actions.c
- * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017, 2018 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
  * Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
  *
@@ -130,36 +130,19 @@ mlxsw_sp_act_mirror_add(void *priv, u8 local_in_port, u8 local_out_port,
 			bool ingress, int *p_span_id)
 {
 	struct mlxsw_sp_port *in_port, *out_port;
-	struct mlxsw_sp_span_entry *span_entry;
 	struct mlxsw_sp *mlxsw_sp = priv;
 	enum mlxsw_sp_span_type type;
-	int err;
 
 	type = ingress ? MLXSW_SP_SPAN_INGRESS : MLXSW_SP_SPAN_EGRESS;
 	out_port = mlxsw_sp->ports[local_out_port];
 	in_port = mlxsw_sp->ports[local_in_port];
 
-	err = mlxsw_sp_span_mirror_add(in_port, out_port, type, false);
-	if (err)
-		return err;
-
-	span_entry = mlxsw_sp_span_entry_find(mlxsw_sp, local_out_port);
-	if (!span_entry) {
-		err = -ENOENT;
-		goto err_span_entry_find;
-	}
-
-	*p_span_id = span_entry->id;
-	return 0;
-
-err_span_entry_find:
-	mlxsw_sp_span_mirror_del(in_port, local_out_port, type, false);
-	return err;
+	return mlxsw_sp_span_mirror_add(in_port, out_port, type,
+					false, p_span_id);
 }
 
 static void
-mlxsw_sp_act_mirror_del(void *priv, u8 local_in_port, u8 local_out_port,
-			bool ingress)
+mlxsw_sp_act_mirror_del(void *priv, u8 local_in_port, int span_id, bool ingress)
 {
 	struct mlxsw_sp *mlxsw_sp = priv;
 	struct mlxsw_sp_port *in_port;
@@ -168,7 +151,7 @@ mlxsw_sp_act_mirror_del(void *priv, u8 local_in_port, u8 local_out_port,
 	type = ingress ? MLXSW_SP_SPAN_INGRESS : MLXSW_SP_SPAN_EGRESS;
 	in_port = mlxsw_sp->ports[local_in_port];
 
-	mlxsw_sp_span_mirror_del(in_port, local_out_port, type, false);
+	mlxsw_sp_span_mirror_del(in_port, span_id, type, false);
 }
 
 static const struct mlxsw_afa_ops mlxsw_sp_act_afa_ops = {

drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c

@@ -118,7 +118,7 @@ static void mlxsw_sp_span_entry_destroy(struct mlxsw_sp *mlxsw_sp,
 }
 
 struct mlxsw_sp_span_entry *
-mlxsw_sp_span_entry_find(struct mlxsw_sp *mlxsw_sp, u8 local_port)
+mlxsw_sp_span_entry_find_by_port(struct mlxsw_sp *mlxsw_sp, u8 local_port)
 {
 	int i;
 
@@ -131,12 +131,26 @@ mlxsw_sp_span_entry_find(struct mlxsw_sp *mlxsw_sp, u8 local_port)
 	return NULL;
 }
 
+static struct mlxsw_sp_span_entry *
+mlxsw_sp_span_entry_find_by_id(struct mlxsw_sp *mlxsw_sp, int span_id)
+{
+	int i;
+
+	for (i = 0; i < mlxsw_sp->span.entries_count; i++) {
+		struct mlxsw_sp_span_entry *curr = &mlxsw_sp->span.entries[i];
+
+		if (curr->ref_count && curr->id == span_id)
+			return curr;
+	}
+	return NULL;
+}
+
 static struct mlxsw_sp_span_entry *
 mlxsw_sp_span_entry_get(struct mlxsw_sp_port *port)
 {
 	struct mlxsw_sp_span_entry *span_entry;
 
-	span_entry = mlxsw_sp_span_entry_find(port->mlxsw_sp,
+	span_entry = mlxsw_sp_span_entry_find_by_port(port->mlxsw_sp,
 						      port->local_port);
 	if (span_entry) {
 		/* Already exists, just take a reference */
@@ -316,7 +330,8 @@ mlxsw_sp_span_inspected_port_del(struct mlxsw_sp_port *port,
 
 int mlxsw_sp_span_mirror_add(struct mlxsw_sp_port *from,
 			     struct mlxsw_sp_port *to,
-			     enum mlxsw_sp_span_type type, bool bind)
+			     enum mlxsw_sp_span_type type, bool bind,
+			     int *p_span_id)
 {
 	struct mlxsw_sp *mlxsw_sp = from->mlxsw_sp;
 	struct mlxsw_sp_span_entry *span_entry;
@@ -333,6 +348,7 @@ int mlxsw_sp_span_mirror_add(struct mlxsw_sp_port *from,
 	if (err)
 		goto err_port_bind;
 
+	*p_span_id = span_entry->id;
 	return 0;
 
 err_port_bind:
@@ -340,13 +356,12 @@ int mlxsw_sp_span_mirror_add(struct mlxsw_sp_port *from,
 	return err;
 }
 
-void mlxsw_sp_span_mirror_del(struct mlxsw_sp_port *from, u8 destination_port,
+void mlxsw_sp_span_mirror_del(struct mlxsw_sp_port *from, int span_id,
 			      enum mlxsw_sp_span_type type, bool bind)
 {
 	struct mlxsw_sp_span_entry *span_entry;
 
-	span_entry = mlxsw_sp_span_entry_find(from->mlxsw_sp,
-					      destination_port);
+	span_entry = mlxsw_sp_span_entry_find_by_id(from->mlxsw_sp, span_id);
 	if (!span_entry) {
 		netdev_err(from->dev, "no span entry found\n");
 		return;

drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h

@@ -62,11 +62,12 @@ void mlxsw_sp_span_fini(struct mlxsw_sp *mlxsw_sp);
 
 int mlxsw_sp_span_mirror_add(struct mlxsw_sp_port *from,
 			     struct mlxsw_sp_port *to,
-			     enum mlxsw_sp_span_type type, bool bind);
-void mlxsw_sp_span_mirror_del(struct mlxsw_sp_port *from, u8 destination_port,
+			     enum mlxsw_sp_span_type type,
+			     bool bind, int *p_span_id);
+void mlxsw_sp_span_mirror_del(struct mlxsw_sp_port *from, int span_id,
 			      enum mlxsw_sp_span_type type, bool bind);
 struct mlxsw_sp_span_entry *
-mlxsw_sp_span_entry_find(struct mlxsw_sp *mlxsw_sp, u8 local_port);
+mlxsw_sp_span_entry_find_by_port(struct mlxsw_sp *mlxsw_sp, u8 local_port);
 
 int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu);