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 = 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 *)&max_backlog,
  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
 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
 134 void rxrpc_sysctl_exit(void)
 135 {
 136         if (rxrpc_sysctl_reg_table)
 137                 unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
 138 }