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
13 static struct ctl_table_header *rxrpc_sysctl_reg_table;
14 static const unsigned int four = 4;
15 static const unsigned int max_backlog = RXRPC_BACKLOG_MAX - 1;
16 static const unsigned int n_65535 = 65535;
17 static const unsigned int n_max_acks = 255;
18 static const unsigned long one_ms = 1;
19 static const unsigned long max_ms = 1000;
20 static const unsigned long one_jiffy = 1;
21 static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
22 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
23 static 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 */
32 static 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 int __init rxrpc_sysctl_init(void)
133 {
134 rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
135 rxrpc_sysctl_table);
136 if (!rxrpc_sysctl_reg_table)
137 return -ENOMEM;
138 return 0;
139 }
140
141 void rxrpc_sysctl_exit(void)
142 {
143 if (rxrpc_sysctl_reg_table)
144 unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
145 }
146
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