net/rxrpc/misc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Miscellaneous bits
   3  *
   4  * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <net/sock.h>
  10 #include <net/af_rxrpc.h>
  11 #include "ar-internal.h"
  12
  13 /*
  14  * The maximum listening backlog queue size that may be set on a socket by
  15  * listen().
  16  */
  17 unsigned int rxrpc_max_backlog __read_mostly = 10;
  18
  19 /*
  20  * How long to wait before scheduling ACK generation after seeing a
  21  * packet with RXRPC_REQUEST_ACK set (in jiffies).
  22  */
  23 unsigned long rxrpc_requested_ack_delay = 1;
  24
  25 /*
  26  * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
  27  *
  28  * We use this when we've received new data packets.  If those packets aren't
  29  * all consumed within this time we will send a DELAY ACK if an ACK was not
  30  * requested to let the sender know it doesn't need to resend.
  31  */
  32 unsigned long rxrpc_soft_ack_delay = HZ;
  33
  34 /*
  35  * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
  36  *
  37  * We use this when we've consumed some previously soft-ACK'd packets when
  38  * further packets aren't immediately received to decide when to send an IDLE
  39  * ACK let the other end know that it can free up its Tx buffer space.
  40  */
  41 unsigned long rxrpc_idle_ack_delay = HZ / 2;
  42
  43 /*
  44  * Receive window size in packets.  This indicates the maximum number of
  45  * unconsumed received packets we're willing to retain in memory.  Once this
  46  * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
  47  * packets.
  48  */
  49 unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
  50 #if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
  51 #error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
  52 #endif
  53
  54 /*
  55  * Maximum Rx MTU size.  This indicates to the sender the size of jumbo packet
  56  * made by gluing normal packets together that we're willing to handle.
  57  */
  58 unsigned int rxrpc_rx_mtu = 5692;
  59
  60 /*
  61  * The maximum number of fragments in a received jumbo packet that we tell the
  62  * sender that we're willing to handle.
  63  */
  64 unsigned int rxrpc_rx_jumbo_max = 4;
  65
  66 /*
  67  * Time till packet resend (in milliseconds).
  68  */
  69 unsigned long rxrpc_resend_timeout = 4 * HZ;
  70
  71 const s8 rxrpc_ack_priority[] = {
  72         [0]                             = 0,
  73         [RXRPC_ACK_DELAY]               = 1,
  74         [RXRPC_ACK_REQUESTED]           = 2,
  75         [RXRPC_ACK_IDLE]                = 3,
  76         [RXRPC_ACK_DUPLICATE]           = 4,
  77         [RXRPC_ACK_OUT_OF_SEQUENCE]     = 5,
  78         [RXRPC_ACK_EXCEEDS_WINDOW]      = 6,
  79         [RXRPC_ACK_NOSPACE]             = 7,
  80         [RXRPC_ACK_PING_RESPONSE]       = 8,
  81 };