/* sysctls for configuring RxRPC operating parameters
   *
   * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public Licence
   * as published by the Free Software Foundation; either version
   * 2 of the Licence, or (at your option) any later version.
   */
  
  #include <linux/sysctl.h>
  #include <net/sock.h>
  #include <net/af_rxrpc.h>
  #include "ar-internal.h"
  
  static struct ctl_table_header *rxrpc_sysctl_reg_table;

  static const unsigned int one = 1;
  static const unsigned int four = 4;

  static const unsigned int thirtytwo = 32;

  static const unsigned int n_65535 = 65535;

  static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;

  static const unsigned long one_jiffy = 1;
  static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;

  
  /*
   * RxRPC operating parameters.
   *
   * See Documentation/networking/rxrpc.txt and the variable definitions for more
   * information on the individual parameters.
   */
  static struct ctl_table rxrpc_sysctl_table[] = {

  	/* Values measured in milliseconds but used in jiffies */

  	{
  		.procname	= "req_ack_delay",
  		.data		= &rxrpc_requested_ack_delay,

  		.maxlen		= sizeof(unsigned long),

  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
  		.extra1		= (void *)&one_jiffy,
  		.extra2		= (void *)&max_jiffies,

  	},
  	{
  		.procname	= "soft_ack_delay",
  		.data		= &rxrpc_soft_ack_delay,

  		.maxlen		= sizeof(unsigned long),

  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
  		.extra1		= (void *)&one_jiffy,
  		.extra2		= (void *)&max_jiffies,

  	},
  	{
  		.procname	= "idle_ack_delay",
  		.data		= &rxrpc_idle_ack_delay,

  		.maxlen		= sizeof(unsigned long),

  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
  		.extra1		= (void *)&one_jiffy,
  		.extra2		= (void *)&max_jiffies,

  	},

  	{
  		.procname	= "idle_conn_expiry",
  		.data		= &rxrpc_conn_idle_client_expiry,

  		.maxlen		= sizeof(unsigned long),

  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
  		.extra1		= (void *)&one_jiffy,
  		.extra2		= (void *)&max_jiffies,

  	},
  	{
  		.procname	= "idle_conn_fast_expiry",
  		.data		= &rxrpc_conn_idle_client_fast_expiry,

  		.maxlen		= sizeof(unsigned long),

  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
  		.extra1		= (void *)&one_jiffy,
  		.extra2		= (void *)&max_jiffies,

  	},

  	{

  		.procname	= "resend_timeout",
  		.data		= &rxrpc_resend_timeout,
  		.maxlen		= sizeof(unsigned long),

  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
  		.extra1		= (void *)&one_jiffy,
  		.extra2		= (void *)&max_jiffies,

  	},

  	/* Non-time values */
  	{
  		.procname	= "max_client_conns",
  		.data		= &rxrpc_max_client_connections,
  		.maxlen		= sizeof(unsigned int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= (void *)&rxrpc_reap_client_connections,
  	},

  	{

  		.procname	= "reap_client_conns",
  		.data		= &rxrpc_reap_client_connections,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= (void *)&one,

  		.extra2		= (void *)&rxrpc_max_client_connections,

  	},

  	{

  		.procname	= "max_backlog",
  		.data		= &rxrpc_max_backlog,
  		.maxlen		= sizeof(unsigned int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= (void *)&four,
  		.extra2		= (void *)&thirtytwo,
  	},
  	{

  		.procname	= "rx_window_size",
  		.data		= &rxrpc_rx_window_size,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= (void *)&one,
  		.extra2		= (void *)&n_max_acks,
  	},
  	{
  		.procname	= "rx_mtu",
  		.data		= &rxrpc_rx_mtu,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= (void *)&one,

  		.extra2		= (void *)&n_65535,

  	},
  	{
  		.procname	= "rx_jumbo_max",
  		.data		= &rxrpc_rx_jumbo_max,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= (void *)&one,
  		.extra2		= (void *)&four,
  	},

  	{ }
  };
  
  int __init rxrpc_sysctl_init(void)
  {
  	rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
  						     rxrpc_sysctl_table);
  	if (!rxrpc_sysctl_reg_table)
  		return -ENOMEM;
  	return 0;
  }
  
  void rxrpc_sysctl_exit(void)
  {
  	if (rxrpc_sysctl_reg_table)
  		unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
  }