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![David Howells](/assets/img/avatar_default.png)
Fix the rxrpc call expiration timeouts and make them settable from userspace. By analogy with other rx implementations, there should be three timeouts: (1) "Normal timeout" This is set for all calls and is triggered if we haven't received any packets from the peer in a while. It is measured from the last time we received any packet on that call. This is not reset by any connection packets (such as CHALLENGE/RESPONSE packets). If a service operation takes a long time, the server should generate PING ACKs at a duration that's substantially less than the normal timeout so is to keep both sides alive. This is set at 1/6 of normal timeout. (2) "Idle timeout" This is set only for a service call and is triggered if we stop receiving the DATA packets that comprise the request data. It is measured from the last time we received a DATA packet. (3) "Hard timeout" This can be set for a call and specified the maximum lifetime of that call. It should not be specified by default. Some operations (such as volume transfer) take a long time. Allow userspace to set/change the timeouts on a call with sendmsg, using a control message: RXRPC_SET_CALL_TIMEOUTS The data to the message is a number of 32-bit words, not all of which need be given: u32 hard_timeout; /* sec from first packet */ u32 idle_timeout; /* msec from packet Rx */ u32 normal_timeout; /* msec from data Rx */ This can be set in combination with any other sendmsg() that affects a call. Signed-off-by: David Howells <dhowells@redhat.com>
161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/* sysctls for configuring RxRPC operating parameters
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*
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* Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/sysctl.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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static struct ctl_table_header *rxrpc_sysctl_reg_table;
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static const unsigned int zero = 0;
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static const unsigned int one = 1;
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static const unsigned int four = 4;
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static const unsigned int thirtytwo = 32;
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static const unsigned int n_65535 = 65535;
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static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
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static const unsigned long one_jiffy = 1;
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static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
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/*
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* RxRPC operating parameters.
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*
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* See Documentation/networking/rxrpc.txt and the variable definitions for more
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* information on the individual parameters.
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*/
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static struct ctl_table rxrpc_sysctl_table[] = {
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/* Values measured in milliseconds but used in jiffies */
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{
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.procname = "req_ack_delay",
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.data = &rxrpc_requested_ack_delay,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void *)&one_jiffy,
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.extra2 = (void *)&max_jiffies,
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},
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{
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.procname = "soft_ack_delay",
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.data = &rxrpc_soft_ack_delay,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void *)&one_jiffy,
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.extra2 = (void *)&max_jiffies,
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},
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{
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.procname = "idle_ack_delay",
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.data = &rxrpc_idle_ack_delay,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void *)&one_jiffy,
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.extra2 = (void *)&max_jiffies,
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},
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{
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.procname = "idle_conn_expiry",
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.data = &rxrpc_conn_idle_client_expiry,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void *)&one_jiffy,
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.extra2 = (void *)&max_jiffies,
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},
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{
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.procname = "idle_conn_fast_expiry",
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.data = &rxrpc_conn_idle_client_fast_expiry,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void *)&one_jiffy,
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.extra2 = (void *)&max_jiffies,
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},
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{
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.procname = "resend_timeout",
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.data = &rxrpc_resend_timeout,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void *)&one_jiffy,
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.extra2 = (void *)&max_jiffies,
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},
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/* Non-time values */
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{
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.procname = "max_client_conns",
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.data = &rxrpc_max_client_connections,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void *)&rxrpc_reap_client_connections,
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},
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{
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.procname = "reap_client_conns",
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.data = &rxrpc_reap_client_connections,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void *)&one,
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.extra2 = (void *)&rxrpc_max_client_connections,
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},
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{
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.procname = "max_backlog",
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.data = &rxrpc_max_backlog,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void *)&four,
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.extra2 = (void *)&thirtytwo,
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},
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{
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.procname = "rx_window_size",
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.data = &rxrpc_rx_window_size,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void *)&one,
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.extra2 = (void *)&n_max_acks,
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},
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{
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.procname = "rx_mtu",
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.data = &rxrpc_rx_mtu,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void *)&one,
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.extra2 = (void *)&n_65535,
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},
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{
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.procname = "rx_jumbo_max",
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.data = &rxrpc_rx_jumbo_max,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void *)&one,
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.extra2 = (void *)&four,
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},
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{ }
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};
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int __init rxrpc_sysctl_init(void)
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{
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rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
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rxrpc_sysctl_table);
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if (!rxrpc_sysctl_reg_table)
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return -ENOMEM;
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return 0;
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}
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void rxrpc_sysctl_exit(void)
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{
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if (rxrpc_sysctl_reg_table)
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unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
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}
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