misc.c 2.3 KB

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