LXR linux/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 */
  17unsigned 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 */
  23unsigned 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 */
  32unsigned 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 */
  41unsigned 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 */
  49unsigned 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 */
  58unsigned 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 */
  64unsigned int rxrpc_rx_jumbo_max = 4;
  65
  66const s8 rxrpc_ack_priority[] = {
  67        [0]                             = 0,
  68        [RXRPC_ACK_DELAY]               = 1,
  69        [RXRPC_ACK_REQUESTED]           = 2,
  70        [RXRPC_ACK_IDLE]                = 3,
  71        [RXRPC_ACK_DUPLICATE]           = 4,
  72        [RXRPC_ACK_OUT_OF_SEQUENCE]     = 5,
  73        [RXRPC_ACK_EXCEEDS_WINDOW]      = 6,
  74        [RXRPC_ACK_NOSPACE]             = 7,
  75        [RXRPC_ACK_PING_RESPONSE]       = 8,
  76};
  77