sysctl.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* sysctls for configuring RxRPC operating parameters
  3 *
  4 * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
  5 * Written by David Howells (dhowells@redhat.com)
  6 */
  7
  8#include <linux/sysctl.h>
  9#include <net/sock.h>
 10#include <net/af_rxrpc.h>
 11#include "ar-internal.h"
 12
 13static struct ctl_table_header *rxrpc_sysctl_reg_table;
 14static const unsigned int rxrpc_rx_mtu_min = 500;
 15static const unsigned int rxrpc_jumbo_max = RXRPC_MAX_NR_JUMBO;
 16static const unsigned int four = 4;
 17static const unsigned int max_backlog = RXRPC_BACKLOG_MAX - 1;
 18static const unsigned int n_65535 = 65535;
 19static const unsigned int n_max_acks = 255;
 20static const unsigned long one_ms = 1;
 21static const unsigned long max_ms = 1000;
 22static const unsigned long one_jiffy = 1;
 23static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
 24#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
 25static const unsigned long max_500 = 500;
 26#endif
 27
 28/*
 29 * RxRPC operating parameters.
 30 *
 31 * See Documentation/networking/rxrpc.rst and the variable definitions for more
 32 * information on the individual parameters.
 33 */
 34static struct ctl_table rxrpc_sysctl_table[] = {
 35	/* Values measured in milliseconds */
 36	{
 37		.procname	= "soft_ack_delay",
 38		.data		= &rxrpc_soft_ack_delay,
 39		.maxlen		= sizeof(unsigned long),
 40		.mode		= 0644,
 41		.proc_handler	= proc_doulongvec_minmax,
 42		.extra1		= (void *)&one_ms,
 43		.extra2		= (void *)&max_ms,
 44	},
 45	{
 46		.procname	= "idle_ack_delay",
 47		.data		= &rxrpc_idle_ack_delay,
 48		.maxlen		= sizeof(unsigned long),
 49		.mode		= 0644,
 50		.proc_handler	= proc_doulongvec_minmax,
 51		.extra1		= (void *)&one_ms,
 52		.extra2		= (void *)&max_ms,
 53	},
 54	{
 55		.procname	= "idle_conn_expiry",
 56		.data		= &rxrpc_conn_idle_client_expiry,
 57		.maxlen		= sizeof(unsigned long),
 58		.mode		= 0644,
 59		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
 60		.extra1		= (void *)&one_jiffy,
 61		.extra2		= (void *)&max_jiffies,
 62	},
 63	{
 64		.procname	= "idle_conn_fast_expiry",
 65		.data		= &rxrpc_conn_idle_client_fast_expiry,
 66		.maxlen		= sizeof(unsigned long),
 67		.mode		= 0644,
 68		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
 69		.extra1		= (void *)&one_jiffy,
 70		.extra2		= (void *)&max_jiffies,
 71	},
 72
 73	/* Values used in milliseconds */
 74#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
 75	{
 76		.procname	= "inject_rx_delay",
 77		.data		= &rxrpc_inject_rx_delay,
 78		.maxlen		= sizeof(unsigned long),
 79		.mode		= 0644,
 80		.proc_handler	= proc_doulongvec_minmax,
 81		.extra1		= (void *)SYSCTL_LONG_ZERO,
 82		.extra2		= (void *)&max_500,
 83	},
 84#endif
 85
 86	/* Non-time values */
 87	{
 88		.procname	= "reap_client_conns",
 89		.data		= &rxrpc_reap_client_connections,
 90		.maxlen		= sizeof(unsigned int),
 91		.mode		= 0644,
 92		.proc_handler	= proc_dointvec_minmax,
 93		.extra1		= (void *)SYSCTL_ONE,
 94		.extra2		= (void *)&n_65535,
 95	},
 96	{
 97		.procname	= "max_backlog",
 98		.data		= &rxrpc_max_backlog,
 99		.maxlen		= sizeof(unsigned int),
100		.mode		= 0644,
101		.proc_handler	= proc_dointvec_minmax,
102		.extra1		= (void *)&four,
103		.extra2		= (void *)&max_backlog,
104	},
105	{
106		.procname	= "rx_window_size",
107		.data		= &rxrpc_rx_window_size,
108		.maxlen		= sizeof(unsigned int),
109		.mode		= 0644,
110		.proc_handler	= proc_dointvec_minmax,
111		.extra1		= (void *)SYSCTL_ONE,
112		.extra2		= (void *)&n_max_acks,
113	},
114	{
115		.procname	= "rx_mtu",
116		.data		= &rxrpc_rx_mtu,
117		.maxlen		= sizeof(unsigned int),
118		.mode		= 0644,
119		.proc_handler	= proc_dointvec_minmax,
120		.extra1		= (void *)&rxrpc_rx_mtu_min,
121		.extra2		= (void *)&n_65535,
122	},
123	{
124		.procname	= "rx_jumbo_max",
125		.data		= &rxrpc_rx_jumbo_max,
126		.maxlen		= sizeof(unsigned int),
127		.mode		= 0644,
128		.proc_handler	= proc_dointvec_minmax,
129		.extra1		= (void *)SYSCTL_ONE,
130		.extra2		= (void *)&rxrpc_jumbo_max,
131	},
132};
133
134int __init rxrpc_sysctl_init(void)
135{
136	rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
137						     rxrpc_sysctl_table);
138	if (!rxrpc_sysctl_reg_table)
139		return -ENOMEM;
140	return 0;
141}
142
143void rxrpc_sysctl_exit(void)
144{
145	if (rxrpc_sysctl_reg_table)
146		unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
147}