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 * Maximum lifetime of a call (in mx). 25 */ 26 unsigned int rxrpc_max_call_lifetime = 60 * 1000; 27 28 /* 29 * How long to wait before scheduling ACK generation after seeing a 30 * packet with RXRPC_REQUEST_ACK set (in ms). 31 */ 32 unsigned int rxrpc_requested_ack_delay = 1; 33 34 /* 35 * How long to wait before scheduling an ACK with subtype DELAY (in ms). 36 * 37 * We use this when we've received new data packets. If those packets aren't 38 * all consumed within this time we will send a DELAY ACK if an ACK was not 39 * requested to let the sender know it doesn't need to resend. 40 */ 41 unsigned int rxrpc_soft_ack_delay = 1 * 1000; 42 43 /* 44 * How long to wait before scheduling an ACK with subtype IDLE (in ms). 45 * 46 * We use this when we've consumed some previously soft-ACK'd packets when 47 * further packets aren't immediately received to decide when to send an IDLE 48 * ACK let the other end know that it can free up its Tx buffer space. 49 */ 50 unsigned int rxrpc_idle_ack_delay = 0.5 * 1000; 51 52 /* 53 * Receive window size in packets. This indicates the maximum number of 54 * unconsumed received packets we're willing to retain in memory. Once this 55 * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further 56 * packets. 57 */ 58 unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE; 59 #if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE 60 #error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE 61 #endif 62 63 /* 64 * Maximum Rx MTU size. This indicates to the sender the size of jumbo packet 65 * made by gluing normal packets together that we're willing to handle. 66 */ 67 unsigned int rxrpc_rx_mtu = 5692; 68 69 /* 70 * The maximum number of fragments in a received jumbo packet that we tell the 71 * sender that we're willing to handle. 72 */ 73 unsigned int rxrpc_rx_jumbo_max = 4; 74 75 /* 76 * Time till packet resend (in milliseconds). 77 */ 78 unsigned int rxrpc_resend_timeout = 4 * 1000; 79 80 const s8 rxrpc_ack_priority[] = { 81 [0] = 0, 82 [RXRPC_ACK_DELAY] = 1, 83 [RXRPC_ACK_REQUESTED] = 2, 84 [RXRPC_ACK_IDLE] = 3, 85 [RXRPC_ACK_DUPLICATE] = 4, 86 [RXRPC_ACK_OUT_OF_SEQUENCE] = 5, 87 [RXRPC_ACK_EXCEEDS_WINDOW] = 6, 88 [RXRPC_ACK_NOSPACE] = 7, 89 [RXRPC_ACK_PING_RESPONSE] = 8, 90 }; 91