1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Miscellaneous bits
3 *
4 * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/kernel.h>
9 #include <net/sock.h>
10 #include <net/af_rxrpc.h>
11 #include "ar-internal.h"
12
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
19 /*
20 * How long to wait before scheduling ACK generation after seeing a
21 * packet with RXRPC_REQUEST_ACK set (in jiffies).
22 */
23 unsigned long rxrpc_requested_ack_delay = 1;
24
25 /*
26 * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
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 */
32 unsigned long rxrpc_soft_ack_delay = HZ;
33
34 /*
35 * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
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 */
41 unsigned long rxrpc_idle_ack_delay = HZ / 2;
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 */
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
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
66 const s8 rxrpc_ack_priority[] = {
67 [0] = 0,
68 [RXRPC_ACK_DELAY] = 1,
69 [RXRPC_ACK_REQUESTED] = 2,
70 [RXRPC_ACK_IDLE] = 3,
71 [RXRPC_ACK_DUPLICATE] = 4,
72 [RXRPC_ACK_OUT_OF_SEQUENCE] = 5,
73 [RXRPC_ACK_EXCEEDS_WINDOW] = 6,
74 [RXRPC_ACK_NOSPACE] = 7,
75 [RXRPC_ACK_PING_RESPONSE] = 8,
76 };