[linux-2.6-block.git] / net / rxrpc / misc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* Miscellaneous bits
 *
 * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#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
b4d0d230	1	// SPDX-License-Identifier: GPL-2.0-or-later
8e688d9c DH	2	/* Miscellaneous bits
	3	*
	4	* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
	5	* Written by David Howells (dhowells@redhat.com)
8e688d9c DH	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <net/sock.h>
	10	#include <net/af_rxrpc.h>
	11	#include "ar-internal.h"
	12
0e119b41 DH	13	/*
	14	* The maximum listening backlog queue size that may be set on a socket by
	15	* listen().
	16	*/
	17	unsigned int rxrpc_max_backlog __read_mostly = 10;
	18
8e688d9c DH	19	/*
8e688d9c DH	20	* How long to wait before scheduling ACK generation after seeing a
a158bdd3	21	* packet with RXRPC_REQUEST_ACK set (in jiffies).
8e688d9c	22	*/
a158bdd3	23	unsigned long rxrpc_requested_ack_delay = 1;
8e688d9c DH	24
8e688d9c DH	25	/*
a158bdd3	26	* How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
8e688d9c DH	27	*
	28	* We use this when we've received new data packets. If those packets aren't
	29	* all consumed within this time we will send a DELAY ACK if an ACK was not
	30	* requested to let the sender know it doesn't need to resend.
	31	*/
a158bdd3	32	unsigned long rxrpc_soft_ack_delay = HZ;
8e688d9c DH	33
8e688d9c DH	34	/*
a158bdd3	35	* How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
8e688d9c DH	36	*
	37	* We use this when we've consumed some previously soft-ACK'd packets when
	38	* further packets aren't immediately received to decide when to send an IDLE
	39	* ACK let the other end know that it can free up its Tx buffer space.
	40	*/
a158bdd3	41	unsigned long rxrpc_idle_ack_delay = HZ / 2;
8e688d9c DH	42
	43	/*
	44	* Receive window size in packets. This indicates the maximum number of
	45	* unconsumed received packets we're willing to retain in memory. Once this
	46	* limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
	47	* packets.
	48	*/
75e42126 DH	49	unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
	50	#if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
	51	#error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
	52	#endif
8e688d9c DH	53
	54	/*
	55	* Maximum Rx MTU size. This indicates to the sender the size of jumbo packet
	56	* made by gluing normal packets together that we're willing to handle.
	57	*/
	58	unsigned int rxrpc_rx_mtu = 5692;
	59
	60	/*
	61	* The maximum number of fragments in a received jumbo packet that we tell the
	62	* sender that we're willing to handle.
	63	*/
	64	unsigned int rxrpc_rx_jumbo_max = 4;
	65
0b58b8a1	66	/*
50235c4b	67	* Time till packet resend (in milliseconds).
0b58b8a1	68	*/
a158bdd3	69	unsigned long rxrpc_resend_timeout = 4 * HZ;
0b58b8a1	70
8e688d9c DH	71	const s8 rxrpc_ack_priority[] = {
	72	[0] = 0,
	73	[RXRPC_ACK_DELAY] = 1,
	74	[RXRPC_ACK_REQUESTED] = 2,
	75	[RXRPC_ACK_IDLE] = 3,
8e83134d DH	76	[RXRPC_ACK_DUPLICATE] = 4,
	77	[RXRPC_ACK_OUT_OF_SEQUENCE] = 5,
	78	[RXRPC_ACK_EXCEEDS_WINDOW] = 6,
	79	[RXRPC_ACK_NOSPACE] = 7,
	80	[RXRPC_ACK_PING_RESPONSE] = 8,
8e688d9c	81	};