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  * 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 };