RDS: sysctls

/*

 * Copyright (c) 2006 Oracle.  All rights reserved.

 *

 * This software is available to you under a choice of one of two

 * licenses.  You may choose to be licensed under the terms of the GNU

 * General Public License (GPL) Version 2, available from the file

 * COPYING in the main directory of this source tree, or the

 * OpenIB.org BSD license below:

 *

 *     Redistribution and use in source and binary forms, with or

 *     without modification, are permitted provided that the following

 *     conditions are met:

 *

 *      - Redistributions of source code must retain the above

 *        copyright notice, this list of conditions and the following

 *        disclaimer.

 *

 *      - Redistributions in binary form must reproduce the above

 *        copyright notice, this list of conditions and the following

 *        disclaimer in the documentation and/or other materials

 *        provided with the distribution.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

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 */

#include <linux/kernel.h>

#include <linux/sysctl.h>

#include <linux/proc_fs.h>

#include "rds.h"

static struct ctl_table_header *rds_sysctl_reg_table;

static unsigned long rds_sysctl_reconnect_min = 1;

static unsigned long rds_sysctl_reconnect_max = ~0UL;

unsigned long rds_sysctl_reconnect_min_jiffies;

unsigned long rds_sysctl_reconnect_max_jiffies = HZ;

unsigned int  rds_sysctl_max_unacked_packets = 8;

unsigned int  rds_sysctl_max_unacked_bytes = (16 << 20);

unsigned int rds_sysctl_ping_enable = 1;

static ctl_table rds_sysctl_rds_table[] = {

	{

		.ctl_name       = CTL_UNNUMBERED,

		.procname       = "reconnect_min_delay_ms",

		.data		= &rds_sysctl_reconnect_min_jiffies,

		.maxlen         = sizeof(unsigned long),

		.mode           = 0644,

		.proc_handler   = &proc_doulongvec_ms_jiffies_minmax,

		.extra1		= &rds_sysctl_reconnect_min,

		.extra2		= &rds_sysctl_reconnect_max_jiffies,

	},

	{

		.ctl_name       = CTL_UNNUMBERED,

		.procname       = "reconnect_max_delay_ms",

		.data		= &rds_sysctl_reconnect_max_jiffies,

		.maxlen         = sizeof(unsigned long),

		.mode           = 0644,

		.proc_handler   = &proc_doulongvec_ms_jiffies_minmax,

		.extra1		= &rds_sysctl_reconnect_min_jiffies,

		.extra2		= &rds_sysctl_reconnect_max,

	},

	{

		.ctl_name	= CTL_UNNUMBERED,

		.procname	= "max_unacked_packets",

		.data		= &rds_sysctl_max_unacked_packets,

		.maxlen         = sizeof(unsigned long),

		.mode           = 0644,

		.proc_handler   = &proc_dointvec,

	},

	{

		.ctl_name	= CTL_UNNUMBERED,

		.procname	= "max_unacked_bytes",

		.data		= &rds_sysctl_max_unacked_bytes,

		.maxlen         = sizeof(unsigned long),

		.mode           = 0644,

		.proc_handler   = &proc_dointvec,

	},

	{

		.ctl_name	= CTL_UNNUMBERED,

		.procname	= "ping_enable",

		.data		= &rds_sysctl_ping_enable,

		.maxlen         = sizeof(int),

		.mode           = 0644,

		.proc_handler   = &proc_dointvec,

	},

	{ .ctl_name = 0}

};

static struct ctl_path rds_sysctl_path[] = {

	{ .procname = "net", .ctl_name = CTL_NET, },

	{ .procname = "rds", .ctl_name = CTL_UNNUMBERED, },

	{ }

};

void rds_sysctl_exit(void)

{

	if (rds_sysctl_reg_table)

		unregister_sysctl_table(rds_sysctl_reg_table);

}

int __init rds_sysctl_init(void)

{

	rds_sysctl_reconnect_min = msecs_to_jiffies(1);

	rds_sysctl_reconnect_min_jiffies = rds_sysctl_reconnect_min;

	rds_sysctl_reg_table = register_sysctl_paths(rds_sysctl_path, rds_sysctl_rds_table);

	if (rds_sysctl_reg_table == NULL)

		return -ENOMEM;

	return 0;

}