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