mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-12 07:14:03 +08:00
a158bdd324
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>
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* Miscellaneous bits
|
|
*
|
|
* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <net/sock.h>
|
|
#include <net/af_rxrpc.h>
|
|
#include "ar-internal.h"
|
|
|
|
/*
|
|
* The maximum listening backlog queue size that may be set on a socket by
|
|
* listen().
|
|
*/
|
|
unsigned int rxrpc_max_backlog __read_mostly = 10;
|
|
|
|
/*
|
|
* How long to wait before scheduling ACK generation after seeing a
|
|
* packet with RXRPC_REQUEST_ACK set (in jiffies).
|
|
*/
|
|
unsigned long rxrpc_requested_ack_delay = 1;
|
|
|
|
/*
|
|
* How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
|
|
*
|
|
* We use this when we've received new data packets. If those packets aren't
|
|
* all consumed within this time we will send a DELAY ACK if an ACK was not
|
|
* requested to let the sender know it doesn't need to resend.
|
|
*/
|
|
unsigned long rxrpc_soft_ack_delay = HZ;
|
|
|
|
/*
|
|
* How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
|
|
*
|
|
* We use this when we've consumed some previously soft-ACK'd packets when
|
|
* further packets aren't immediately received to decide when to send an IDLE
|
|
* ACK let the other end know that it can free up its Tx buffer space.
|
|
*/
|
|
unsigned long rxrpc_idle_ack_delay = HZ / 2;
|
|
|
|
/*
|
|
* Receive window size in packets. This indicates the maximum number of
|
|
* unconsumed received packets we're willing to retain in memory. Once this
|
|
* limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
|
|
* packets.
|
|
*/
|
|
unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
|
|
#if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
|
|
#error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
|
|
#endif
|
|
|
|
/*
|
|
* Maximum Rx MTU size. This indicates to the sender the size of jumbo packet
|
|
* made by gluing normal packets together that we're willing to handle.
|
|
*/
|
|
unsigned int rxrpc_rx_mtu = 5692;
|
|
|
|
/*
|
|
* The maximum number of fragments in a received jumbo packet that we tell the
|
|
* sender that we're willing to handle.
|
|
*/
|
|
unsigned int rxrpc_rx_jumbo_max = 4;
|
|
|
|
/*
|
|
* Time till packet resend (in milliseconds).
|
|
*/
|
|
unsigned long rxrpc_resend_timeout = 4 * HZ;
|
|
|
|
const s8 rxrpc_ack_priority[] = {
|
|
[0] = 0,
|
|
[RXRPC_ACK_DELAY] = 1,
|
|
[RXRPC_ACK_REQUESTED] = 2,
|
|
[RXRPC_ACK_IDLE] = 3,
|
|
[RXRPC_ACK_DUPLICATE] = 4,
|
|
[RXRPC_ACK_OUT_OF_SEQUENCE] = 5,
|
|
[RXRPC_ACK_EXCEEDS_WINDOW] = 6,
|
|
[RXRPC_ACK_NOSPACE] = 7,
|
|
[RXRPC_ACK_PING_RESPONSE] = 8,
|
|
};
|