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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 | ||
17 | /* | |
18 | * How long to wait before scheduling ACK generation after seeing a | |
19 | * packet with RXRPC_REQUEST_ACK set (in jiffies). | |
20 | */ | |
21 | unsigned int rxrpc_requested_ack_delay = 1; | |
22 | ||
23 | /* | |
24 | * How long to wait before scheduling an ACK with subtype DELAY (in jiffies). | |
25 | * | |
26 | * We use this when we've received new data packets. If those packets aren't | |
27 | * all consumed within this time we will send a DELAY ACK if an ACK was not | |
28 | * requested to let the sender know it doesn't need to resend. | |
29 | */ | |
30 | unsigned int rxrpc_soft_ack_delay = 1 * HZ; | |
31 | ||
32 | /* | |
33 | * How long to wait before scheduling an ACK with subtype IDLE (in jiffies). | |
34 | * | |
35 | * We use this when we've consumed some previously soft-ACK'd packets when | |
36 | * further packets aren't immediately received to decide when to send an IDLE | |
37 | * ACK let the other end know that it can free up its Tx buffer space. | |
38 | */ | |
39 | unsigned int rxrpc_idle_ack_delay = 0.5 * HZ; | |
40 | ||
41 | /* | |
42 | * Receive window size in packets. This indicates the maximum number of | |
43 | * unconsumed received packets we're willing to retain in memory. Once this | |
44 | * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further | |
45 | * packets. | |
46 | */ | |
47 | unsigned int rxrpc_rx_window_size = 32; | |
48 | ||
49 | /* | |
50 | * Maximum Rx MTU size. This indicates to the sender the size of jumbo packet | |
51 | * made by gluing normal packets together that we're willing to handle. | |
52 | */ | |
53 | unsigned int rxrpc_rx_mtu = 5692; | |
54 | ||
55 | /* | |
56 | * The maximum number of fragments in a received jumbo packet that we tell the | |
57 | * sender that we're willing to handle. | |
58 | */ | |
59 | unsigned int rxrpc_rx_jumbo_max = 4; | |
60 | ||
5b3e87f1 | 61 | const char *const rxrpc_pkts[] = { |
8e688d9c DH |
62 | "?00", |
63 | "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG", | |
64 | "?09", "?10", "?11", "?12", "VERSION", "?14", "?15" | |
65 | }; | |
66 | ||
67 | const s8 rxrpc_ack_priority[] = { | |
68 | [0] = 0, | |
69 | [RXRPC_ACK_DELAY] = 1, | |
70 | [RXRPC_ACK_REQUESTED] = 2, | |
71 | [RXRPC_ACK_IDLE] = 3, | |
72 | [RXRPC_ACK_PING_RESPONSE] = 4, | |
73 | [RXRPC_ACK_DUPLICATE] = 5, | |
74 | [RXRPC_ACK_OUT_OF_SEQUENCE] = 6, | |
75 | [RXRPC_ACK_EXCEEDS_WINDOW] = 7, | |
76 | [RXRPC_ACK_NOSPACE] = 8, | |
77 | }; | |
78 | ||
79 | const char *rxrpc_acks(u8 reason) | |
80 | { | |
81 | static const char *const str[] = { | |
82 | "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", | |
83 | "IDL", "-?-" | |
84 | }; | |
85 | ||
86 | if (reason >= ARRAY_SIZE(str)) | |
87 | reason = ARRAY_SIZE(str) - 1; | |
88 | return str[reason]; | |
89 | } |