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245500d853
Rewrite the rxrpc client connection manager so that it can support multiple
connections for a given security key to a peer. The following changes are
made:
(1) For each open socket, the code currently maintains an rbtree with the
connections placed into it, keyed by communications parameters. This
is tricky to maintain as connections can be culled from the tree or
replaced within it. Connections can require replacement for a number
of reasons, e.g. their IDs span too great a range for the IDR data
type to represent efficiently, the call ID numbers on that conn would
overflow or the conn got aborted.
This is changed so that there's now a connection bundle object placed
in the tree, keyed on the same parameters. The bundle, however, does
not need to be replaced.
(2) An rxrpc_bundle object can now manage the available channels for a set
of parallel connections. The lock that manages this is moved there
from the rxrpc_connection struct (channel_lock).
(3) There'a a dummy bundle for all incoming connections to share so that
they have a channel_lock too. It might be better to give each
incoming connection its own bundle. This bundle is not needed to
manage which channels incoming calls are made on because that's the
solely at whim of the client.
(4) The restrictions on how many client connections are around are
removed. Instead, a previous patch limits the number of client calls
that can be allocated. Ordinarily, client connections are reaped
after 2 minutes on the idle queue, but when more than a certain number
of connections are in existence, the reaper starts reaping them after
2s of idleness instead to get the numbers back down.
It could also be made such that new call allocations are forced to
wait until the number of outstanding connections subsides.
Signed-off-by: David Howells <dhowells@redhat.com>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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#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 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.rst 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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/* Non-time values */
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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 *)SYSCTL_ONE,
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.extra2 = (void *)&n_65535,
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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 *)SYSCTL_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 *)SYSCTL_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 *)SYSCTL_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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