net/rxrpc/misc.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* Miscellaneous bits
0003  *
0004  * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
0005  * Written by David Howells (dhowells@redhat.com)
0006  */
0007
0008 #include <linux/kernel.h>
0009 #include <net/sock.h>
0010 #include <net/af_rxrpc.h>
0011 #include "ar-internal.h"
0012
0013 /*
0014  * The maximum listening backlog queue size that may be set on a socket by
0015  * listen().
0016  */
0017 unsigned int rxrpc_max_backlog __read_mostly = 10;
0018
0019 /*
0020  * How long to wait before scheduling ACK generation after seeing a
0021  * packet with RXRPC_REQUEST_ACK set (in jiffies).
0022  */
0023 unsigned long rxrpc_requested_ack_delay = 1;
0024
0025 /*
0026  * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
0027  *
0028  * We use this when we've received new data packets.  If those packets aren't
0029  * all consumed within this time we will send a DELAY ACK if an ACK was not
0030  * requested to let the sender know it doesn't need to resend.
0031  */
0032 unsigned long rxrpc_soft_ack_delay = HZ;
0033
0034 /*
0035  * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
0036  *
0037  * We use this when we've consumed some previously soft-ACK'd packets when
0038  * further packets aren't immediately received to decide when to send an IDLE
0039  * ACK let the other end know that it can free up its Tx buffer space.
0040  */
0041 unsigned long rxrpc_idle_ack_delay = HZ / 2;
0042
0043 /*
0044  * Receive window size in packets.  This indicates the maximum number of
0045  * unconsumed received packets we're willing to retain in memory.  Once this
0046  * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
0047  * packets.
0048  */
0049 unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
0050 #if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
0051 #error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
0052 #endif
0053
0054 /*
0055  * Maximum Rx MTU size.  This indicates to the sender the size of jumbo packet
0056  * made by gluing normal packets together that we're willing to handle.
0057  */
0058 unsigned int rxrpc_rx_mtu = 5692;
0059
0060 /*
0061  * The maximum number of fragments in a received jumbo packet that we tell the
0062  * sender that we're willing to handle.
0063  */
0064 unsigned int rxrpc_rx_jumbo_max = 4;
0065
0066 const s8 rxrpc_ack_priority[] = {
0067     [0]             = 0,
0068     [RXRPC_ACK_DELAY]       = 1,
0069     [RXRPC_ACK_REQUESTED]       = 2,
0070     [RXRPC_ACK_IDLE]        = 3,
0071     [RXRPC_ACK_DUPLICATE]       = 4,
0072     [RXRPC_ACK_OUT_OF_SEQUENCE] = 5,
0073     [RXRPC_ACK_EXCEEDS_WINDOW]  = 6,
0074     [RXRPC_ACK_NOSPACE]     = 7,
0075     [RXRPC_ACK_PING_RESPONSE]   = 8,
0076 };