net/rxrpc/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
  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
 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
 140 void rxrpc_sysctl_exit(void)
 141 {
 142         if (rxrpc_sysctl_reg_table)
 143                 unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
 144 }