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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 | /* |
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 | |
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 | |
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 | }; |