mlxsw: Remove debugfs interface

We don't use it during development and we can't extend it either, so
remove it.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: idosch

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

@@ -40,9 +40,6 @@
 #include <linux/export.h>
 #include <linux/err.h>
 #include <linux/if_link.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <linux/u64_stats_sync.h>
 #include <linux/netdevice.h>
 #include <linux/completion.h>
 #include <linux/skbuff.h>
@@ -74,23 +71,9 @@ static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock);
 
 static const char mlxsw_core_driver_name[] = "mlxsw_core";
 
-static struct dentry *mlxsw_core_dbg_root;
-
 static struct workqueue_struct *mlxsw_wq;
 static struct workqueue_struct *mlxsw_owq;
 
-struct mlxsw_core_pcpu_stats {
-	u64			trap_rx_packets[MLXSW_TRAP_ID_MAX];
-	u64			trap_rx_bytes[MLXSW_TRAP_ID_MAX];
-	u64			port_rx_packets[MLXSW_PORT_MAX_PORTS];
-	u64			port_rx_bytes[MLXSW_PORT_MAX_PORTS];
-	struct u64_stats_sync	syncp;
-	u32			trap_rx_dropped[MLXSW_TRAP_ID_MAX];
-	u32			port_rx_dropped[MLXSW_PORT_MAX_PORTS];
-	u32			trap_rx_invalid;
-	u32			port_rx_invalid;
-};
-
 struct mlxsw_core_port {
 	struct devlink_port devlink_port;
 	void *port_driver_priv;
@@ -121,12 +104,6 @@ struct mlxsw_core {
 		spinlock_t trans_list_lock; /* protects trans_list writes */
 		bool use_emad;
 	} emad;
-	struct mlxsw_core_pcpu_stats __percpu *pcpu_stats;
-	struct dentry *dbg_dir;
-	struct {
-		struct debugfs_blob_wrapper vsd_blob;
-		struct debugfs_blob_wrapper psid_blob;
-	} dbg;
 	struct {
 		u8 *mapping; /* lag_id+port_index to local_port mapping */
 	} lag;
@@ -703,91 +680,6 @@ static int mlxsw_emad_reg_access(struct mlxsw_core *mlxsw_core,
  * Core functions
  *****************/
 
-static int mlxsw_core_rx_stats_dbg_read(struct seq_file *file, void *data)
-{
-	struct mlxsw_core *mlxsw_core = file->private;
-	struct mlxsw_core_pcpu_stats *p;
-	u64 rx_packets, rx_bytes;
-	u64 tmp_rx_packets, tmp_rx_bytes;
-	u32 rx_dropped, rx_invalid;
-	unsigned int start;
-	int i;
-	int j;
-	static const char hdr[] =
-		"     NUM   RX_PACKETS     RX_BYTES RX_DROPPED\n";
-
-	seq_printf(file, hdr);
-	for (i = 0; i < MLXSW_TRAP_ID_MAX; i++) {
-		rx_packets = 0;
-		rx_bytes = 0;
-		rx_dropped = 0;
-		for_each_possible_cpu(j) {
-			p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
-			do {
-				start = u64_stats_fetch_begin(&p->syncp);
-				tmp_rx_packets = p->trap_rx_packets[i];
-				tmp_rx_bytes = p->trap_rx_bytes[i];
-			} while (u64_stats_fetch_retry(&p->syncp, start));
-
-			rx_packets += tmp_rx_packets;
-			rx_bytes += tmp_rx_bytes;
-			rx_dropped += p->trap_rx_dropped[i];
-		}
-		seq_printf(file, "trap %3d %12llu %12llu %10u\n",
-			   i, rx_packets, rx_bytes, rx_dropped);
-	}
-	rx_invalid = 0;
-	for_each_possible_cpu(j) {
-		p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
-		rx_invalid += p->trap_rx_invalid;
-	}
-	seq_printf(file, "trap INV                           %10u\n",
-		   rx_invalid);
-
-	for (i = 0; i < MLXSW_PORT_MAX_PORTS; i++) {
-		rx_packets = 0;
-		rx_bytes = 0;
-		rx_dropped = 0;
-		for_each_possible_cpu(j) {
-			p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
-			do {
-				start = u64_stats_fetch_begin(&p->syncp);
-				tmp_rx_packets = p->port_rx_packets[i];
-				tmp_rx_bytes = p->port_rx_bytes[i];
-			} while (u64_stats_fetch_retry(&p->syncp, start));
-
-			rx_packets += tmp_rx_packets;
-			rx_bytes += tmp_rx_bytes;
-			rx_dropped += p->port_rx_dropped[i];
-		}
-		seq_printf(file, "port %3d %12llu %12llu %10u\n",
-			   i, rx_packets, rx_bytes, rx_dropped);
-	}
-	rx_invalid = 0;
-	for_each_possible_cpu(j) {
-		p = per_cpu_ptr(mlxsw_core->pcpu_stats, j);
-		rx_invalid += p->port_rx_invalid;
-	}
-	seq_printf(file, "port INV                           %10u\n",
-		   rx_invalid);
-	return 0;
-}
-
-static int mlxsw_core_rx_stats_dbg_open(struct inode *inode, struct file *f)
-{
-	struct mlxsw_core *mlxsw_core = inode->i_private;
-
-	return single_open(f, mlxsw_core_rx_stats_dbg_read, mlxsw_core);
-}
-
-static const struct file_operations mlxsw_core_rx_stats_dbg_ops = {
-	.owner = THIS_MODULE,
-	.open = mlxsw_core_rx_stats_dbg_open,
-	.release = single_release,
-	.read = seq_read,
-	.llseek = seq_lseek
-};
-
 int mlxsw_core_driver_register(struct mlxsw_driver *mlxsw_driver)
 {
 	spin_lock(&mlxsw_core_driver_list_lock);
@@ -835,32 +727,6 @@ static void mlxsw_core_driver_put(const char *kind)
 	spin_unlock(&mlxsw_core_driver_list_lock);
 }
 
-static int mlxsw_core_debugfs_init(struct mlxsw_core *mlxsw_core)
-{
-	const struct mlxsw_bus_info *bus_info = mlxsw_core->bus_info;
-
-	mlxsw_core->dbg_dir = debugfs_create_dir(bus_info->device_name,
-						 mlxsw_core_dbg_root);
-	if (!mlxsw_core->dbg_dir)
-		return -ENOMEM;
-	debugfs_create_file("rx_stats", S_IRUGO, mlxsw_core->dbg_dir,
-			    mlxsw_core, &mlxsw_core_rx_stats_dbg_ops);
-	mlxsw_core->dbg.vsd_blob.data = (void *) &bus_info->vsd;
-	mlxsw_core->dbg.vsd_blob.size = sizeof(bus_info->vsd);
-	debugfs_create_blob("vsd", S_IRUGO, mlxsw_core->dbg_dir,
-			    &mlxsw_core->dbg.vsd_blob);
-	mlxsw_core->dbg.psid_blob.data = (void *) &bus_info->psid;
-	mlxsw_core->dbg.psid_blob.size = sizeof(bus_info->psid);
-	debugfs_create_blob("psid", S_IRUGO, mlxsw_core->dbg_dir,
-			    &mlxsw_core->dbg.psid_blob);
-	return 0;
-}
-
-static void mlxsw_core_debugfs_fini(struct mlxsw_core *mlxsw_core)
-{
-	debugfs_remove_recursive(mlxsw_core->dbg_dir);
-}
-
 static int mlxsw_devlink_port_split(struct devlink *devlink,
 				    unsigned int port_index,
 				    unsigned int count)
@@ -1101,13 +967,6 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	mlxsw_core->bus_priv = bus_priv;
 	mlxsw_core->bus_info = mlxsw_bus_info;
 
-	mlxsw_core->pcpu_stats =
-		netdev_alloc_pcpu_stats(struct mlxsw_core_pcpu_stats);
-	if (!mlxsw_core->pcpu_stats) {
-		err = -ENOMEM;
-		goto err_alloc_stats;
-	}
-
 	err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile,
 			      &mlxsw_core->res);
 	if (err)
@@ -1148,15 +1007,8 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 			goto err_driver_init;
 	}
 
-	err = mlxsw_core_debugfs_init(mlxsw_core);
-	if (err)
-		goto err_debugfs_init;
-
 	return 0;
 
-err_debugfs_init:
-	if (mlxsw_core->driver->fini)
-		mlxsw_core->driver->fini(mlxsw_core);
 err_driver_init:
 	mlxsw_thermal_fini(mlxsw_core->thermal);
 err_thermal_init:
@@ -1169,8 +1021,6 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 err_alloc_lag_mapping:
 	mlxsw_bus->fini(bus_priv);
 err_bus_init:
-	free_percpu(mlxsw_core->pcpu_stats);
-err_alloc_stats:
 	devlink_free(devlink);
 err_devlink_alloc:
 	mlxsw_core_driver_put(device_kind);
@@ -1183,15 +1033,13 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core)
 	const char *device_kind = mlxsw_core->bus_info->device_kind;
 	struct devlink *devlink = priv_to_devlink(mlxsw_core);
 
-	mlxsw_core_debugfs_fini(mlxsw_core);
 	if (mlxsw_core->driver->fini)
 		mlxsw_core->driver->fini(mlxsw_core);
 	mlxsw_thermal_fini(mlxsw_core->thermal);
 	devlink_unregister(devlink);
 	mlxsw_emad_fini(mlxsw_core);
 	kfree(mlxsw_core->lag.mapping);
 	mlxsw_core->bus->fini(mlxsw_core->bus_priv);
-	free_percpu(mlxsw_core->pcpu_stats);
 	devlink_free(devlink);
 	mlxsw_core_driver_put(device_kind);
 }
@@ -1639,7 +1487,6 @@ void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
 {
 	struct mlxsw_rx_listener_item *rxl_item;
 	const struct mlxsw_rx_listener *rxl;
-	struct mlxsw_core_pcpu_stats *pcpu_stats;
 	u8 local_port;
 	bool found = false;
 
@@ -1678,26 +1525,10 @@ void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
 	if (!found)
 		goto drop;
 
-	pcpu_stats = this_cpu_ptr(mlxsw_core->pcpu_stats);
-	u64_stats_update_begin(&pcpu_stats->syncp);
-	pcpu_stats->port_rx_packets[local_port]++;
-	pcpu_stats->port_rx_bytes[local_port] += skb->len;
-	pcpu_stats->trap_rx_packets[rx_info->trap_id]++;
-	pcpu_stats->trap_rx_bytes[rx_info->trap_id] += skb->len;
-	u64_stats_update_end(&pcpu_stats->syncp);
-
 	rxl->func(skb, local_port, rxl_item->priv);
 	return;
 
 drop:
-	if (rx_info->trap_id >= MLXSW_TRAP_ID_MAX)
-		this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_invalid);
-	else
-		this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_dropped[rx_info->trap_id]);
-	if (local_port >= MLXSW_PORT_MAX_PORTS)
-		this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_invalid);
-	else
-		this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_dropped[local_port]);
 	dev_kfree_skb(skb);
 }
 EXPORT_SYMBOL(mlxsw_core_skb_receive);
@@ -1926,23 +1757,15 @@ static int __init mlxsw_core_module_init(void)
 		err = -ENOMEM;
 		goto err_alloc_ordered_workqueue;
 	}
-	mlxsw_core_dbg_root = debugfs_create_dir(mlxsw_core_driver_name, NULL);
-	if (!mlxsw_core_dbg_root) {
-		err = -ENOMEM;
-		goto err_debugfs_create_dir;
-	}
 	return 0;
 
-err_debugfs_create_dir:
-	destroy_workqueue(mlxsw_owq);
 err_alloc_ordered_workqueue:
 	destroy_workqueue(mlxsw_wq);
 	return err;
 }
 
 static void __exit mlxsw_core_module_exit(void)
 {
-	debugfs_remove_recursive(mlxsw_core_dbg_root);
 	destroy_workqueue(mlxsw_owq);
 	destroy_workqueue(mlxsw_wq);
 }