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