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 * 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 23 /* 24 * How long to wait before scheduling ACK generation after seeing a 25 * packet with RXRPC_REQUEST_ACK set (in jiffies). 26 */ 27 unsigned int rxrpc_requested_ack_delay = 1; 28 29 /* 30 * How long to wait before scheduling an ACK with subtype DELAY (in jiffies). 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 */ 36 unsigned int rxrpc_soft_ack_delay = 1 * HZ; 37 38 /* 39 * How long to wait before scheduling an ACK with subtype IDLE (in jiffies). 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 */ 45 unsigned int rxrpc_idle_ack_delay = 0.5 * HZ; 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 */ 53 unsigned int rxrpc_rx_window_size = 32; 54 55 /* 56 * Maximum Rx MTU size. This indicates to the sender the size of jumbo packet 57 * made by gluing normal packets together that we're willing to handle. 58 */ 59 unsigned int rxrpc_rx_mtu = 5692; 60 61 /* 62 * The maximum number of fragments in a received jumbo packet that we tell the 63 * sender that we're willing to handle. 64 */ 65 unsigned int rxrpc_rx_jumbo_max = 4; 66 67 const char *const rxrpc_pkts[] = { 68 "?00", 69 "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG", 70 "?09", "?10", "?11", "?12", "VERSION", "?14", "?15" 71 }; 72 73 const s8 rxrpc_ack_priority[] = { 74 [0] = 0, 75 [RXRPC_ACK_DELAY] = 1, 76 [RXRPC_ACK_REQUESTED] = 2, 77 [RXRPC_ACK_IDLE] = 3, 78 [RXRPC_ACK_PING_RESPONSE] = 4, 79 [RXRPC_ACK_DUPLICATE] = 5, 80 [RXRPC_ACK_OUT_OF_SEQUENCE] = 6, 81 [RXRPC_ACK_EXCEEDS_WINDOW] = 7, 82 [RXRPC_ACK_NOSPACE] = 8, 83 }; 84 85 const char *rxrpc_acks(u8 reason) 86 { 87 static const char *const str[] = { 88 "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", 89 "IDL", "-?-" 90 }; 91 92 if (reason >= ARRAY_SIZE(str)) 93 reason = ARRAY_SIZE(str) - 1; 94 return str[reason]; 95 } 96