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_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 }