[mirror_ubuntu-bionic-kernel.git] / net / rxrpc / misc.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,
};
Commit	Line	Data
8e688d9c DH	1	/* Miscellaneous bits
	2	*
	3	* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <net/sock.h>
	14	#include <net/af_rxrpc.h>
	15	#include "ar-internal.h"
	16
0e119b41 DH	17	/*
	18	* The maximum listening backlog queue size that may be set on a socket by
	19	* listen().
	20	*/
	21	unsigned int rxrpc_max_backlog __read_mostly = 10;
	22
8e688d9c DH	23	/*
8e688d9c DH	24	* How long to wait before scheduling ACK generation after seeing a
a158bdd3	25	* packet with RXRPC_REQUEST_ACK set (in jiffies).
8e688d9c	26	*/
a158bdd3	27	unsigned long rxrpc_requested_ack_delay = 1;
8e688d9c DH	28
8e688d9c DH	29	/*
a158bdd3	30	* How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
8e688d9c DH	31	*
	32	* We use this when we've received new data packets. If those packets aren't
	33	* all consumed within this time we will send a DELAY ACK if an ACK was not
	34	* requested to let the sender know it doesn't need to resend.
	35	*/
a158bdd3	36	unsigned long rxrpc_soft_ack_delay = HZ;
8e688d9c DH	37
8e688d9c DH	38	/*
a158bdd3	39	* How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
8e688d9c DH	40	*
	41	* We use this when we've consumed some previously soft-ACK'd packets when
	42	* further packets aren't immediately received to decide when to send an IDLE
	43	* ACK let the other end know that it can free up its Tx buffer space.
	44	*/
a158bdd3	45	unsigned long rxrpc_idle_ack_delay = HZ / 2;
8e688d9c DH	46
	47	/*
	48	* Receive window size in packets. This indicates the maximum number of
	49	* unconsumed received packets we're willing to retain in memory. Once this
	50	* limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
	51	* packets.
	52	*/
75e42126 DH	53	unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
	54	#if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
	55	#error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
	56	#endif
8e688d9c DH	57
	58	/*
	59	* Maximum Rx MTU size. This indicates to the sender the size of jumbo packet
	60	* made by gluing normal packets together that we're willing to handle.
	61	*/
	62	unsigned int rxrpc_rx_mtu = 5692;
	63
	64	/*
	65	* The maximum number of fragments in a received jumbo packet that we tell the
	66	* sender that we're willing to handle.
	67	*/
	68	unsigned int rxrpc_rx_jumbo_max = 4;
	69
0b58b8a1	70	/*
50235c4b	71	* Time till packet resend (in milliseconds).
0b58b8a1	72	*/
a158bdd3	73	unsigned long rxrpc_resend_timeout = 4 * HZ;
0b58b8a1	74
8e688d9c DH	75	const s8 rxrpc_ack_priority[] = {
	76	[0] = 0,
	77	[RXRPC_ACK_DELAY] = 1,
	78	[RXRPC_ACK_REQUESTED] = 2,
	79	[RXRPC_ACK_IDLE] = 3,
8e83134d DH	80	[RXRPC_ACK_DUPLICATE] = 4,
	81	[RXRPC_ACK_OUT_OF_SEQUENCE] = 5,
	82	[RXRPC_ACK_EXCEEDS_WINDOW] = 6,
	83	[RXRPC_ACK_NOSPACE] = 7,
	84	[RXRPC_ACK_PING_RESPONSE] = 8,
8e688d9c	85	};