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