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 61 const char *const rxrpc_pkts[] = { 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 } 90