LXR linux/net/rxrpc/misc.c

   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 */
  21unsigned 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 */
  30unsigned 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 */
  39unsigned 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 */
  47unsigned 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 */
  53unsigned 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 */
  59unsigned int rxrpc_rx_jumbo_max = 4;
  60
  61const 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
  67const 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
  79const 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