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  * How long to wait before scheduling ACK generation after seeing a
  25  * packet with RXRPC_REQUEST_ACK set (in jiffies).
  26  */
  27 unsigned int rxrpc_requested_ack_delay = 1;
  28
  29 /*
  30  * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
  31  *
  32  * We use this when we've received new data packets.  If those packets aren't
  33  * all consumed within this time we will send a DELAY ACK if an ACK was not
  34  * requested to let the sender know it doesn't need to resend.
  35  */
  36 unsigned int rxrpc_soft_ack_delay = 1 * HZ;
  37
  38 /*
  39  * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
  40  *
  41  * We use this when we've consumed some previously soft-ACK'd packets when
  42  * further packets aren't immediately received to decide when to send an IDLE
  43  * ACK let the other end know that it can free up its Tx buffer space.
  44  */
  45 unsigned int rxrpc_idle_ack_delay = 0.5 * HZ;
  46
  47 /*
  48  * Receive window size in packets.  This indicates the maximum number of
  49  * unconsumed received packets we're willing to retain in memory.  Once this
  50  * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
  51  * packets.
  52  */
  53 unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
  54 #if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
  55 #error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
  56 #endif
  57
  58 /*
  59  * Maximum Rx MTU size.  This indicates to the sender the size of jumbo packet
  60  * made by gluing normal packets together that we're willing to handle.
  61  */
  62 unsigned int rxrpc_rx_mtu = 5692;
  63
  64 /*
  65  * The maximum number of fragments in a received jumbo packet that we tell the
  66  * sender that we're willing to handle.
  67  */
  68 unsigned int rxrpc_rx_jumbo_max = 4;
  69
  70 /*
  71  * Time till packet resend (in milliseconds).
  72  */
  73 unsigned int rxrpc_resend_timeout = 4 * 1000;
  74
  75 const char *const rxrpc_pkts[] = {
  76         "?00",
  77         "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
  78         "?09", "?10", "?11", "?12", "VERSION", "?14", "?15"
  79 };
  80
  81 const s8 rxrpc_ack_priority[] = {
  82         [0]                             = 0,
  83         [RXRPC_ACK_DELAY]               = 1,
  84         [RXRPC_ACK_REQUESTED]           = 2,
  85         [RXRPC_ACK_IDLE]                = 3,
  86         [RXRPC_ACK_DUPLICATE]           = 4,
  87         [RXRPC_ACK_OUT_OF_SEQUENCE]     = 5,
  88         [RXRPC_ACK_EXCEEDS_WINDOW]      = 6,
  89         [RXRPC_ACK_NOSPACE]             = 7,
  90         [RXRPC_ACK_PING_RESPONSE]       = 8,
  91         [RXRPC_ACK_PING]                = 9,
  92 };
  93
  94 const char *rxrpc_acks(u8 reason)
  95 {
  96         static const char *const str[] = {
  97                 "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY",
  98                 "IDL", "-?-"
  99         };
 100
 101         if (reason >= ARRAY_SIZE(str))
 102                 reason = ARRAY_SIZE(str) - 1;
 103         return str[reason];
 104 }
 105
 106 const char rxrpc_skb_traces[rxrpc_skb__nr_trace][7] = {
 107         [rxrpc_skb_rx_cleaned]          = "Rx CLN",
 108         [rxrpc_skb_rx_freed]            = "Rx FRE",
 109         [rxrpc_skb_rx_got]              = "Rx GOT",
 110         [rxrpc_skb_rx_lost]             = "Rx *L*",
 111         [rxrpc_skb_rx_received]         = "Rx RCV",
 112         [rxrpc_skb_rx_purged]           = "Rx PUR",
 113         [rxrpc_skb_rx_rotated]          = "Rx ROT",
 114         [rxrpc_skb_rx_seen]             = "Rx SEE",
 115         [rxrpc_skb_tx_cleaned]          = "Tx CLN",
 116         [rxrpc_skb_tx_freed]            = "Tx FRE",
 117         [rxrpc_skb_tx_got]              = "Tx GOT",
 118         [rxrpc_skb_tx_lost]             = "Tx *L*",
 119         [rxrpc_skb_tx_new]              = "Tx NEW",
 120         [rxrpc_skb_tx_rotated]          = "Tx ROT",
 121         [rxrpc_skb_tx_seen]             = "Tx SEE",
 122 };
 123
 124 const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4] = {
 125         [rxrpc_conn_new_client]         = "NWc",
 126         [rxrpc_conn_new_service]        = "NWs",
 127         [rxrpc_conn_queued]             = "QUE",
 128         [rxrpc_conn_seen]               = "SEE",
 129         [rxrpc_conn_got]                = "GOT",
 130         [rxrpc_conn_put_client]         = "PTc",
 131         [rxrpc_conn_put_service]        = "PTs",
 132 };
 133
 134 const char rxrpc_client_traces[rxrpc_client__nr_trace][7] = {
 135         [rxrpc_client_activate_chans]   = "Activa",
 136         [rxrpc_client_alloc]            = "Alloc ",
 137         [rxrpc_client_chan_activate]    = "ChActv",
 138         [rxrpc_client_chan_disconnect]  = "ChDisc",
 139         [rxrpc_client_chan_pass]        = "ChPass",
 140         [rxrpc_client_chan_unstarted]   = "ChUnst",
 141         [rxrpc_client_cleanup]          = "Clean ",
 142         [rxrpc_client_count]            = "Count ",
 143         [rxrpc_client_discard]          = "Discar",
 144         [rxrpc_client_duplicate]        = "Duplic",
 145         [rxrpc_client_exposed]          = "Expose",
 146         [rxrpc_client_replace]          = "Replac",
 147         [rxrpc_client_to_active]        = "->Actv",
 148         [rxrpc_client_to_culled]        = "->Cull",
 149         [rxrpc_client_to_idle]          = "->Idle",
 150         [rxrpc_client_to_inactive]      = "->Inac",
 151         [rxrpc_client_to_waiting]       = "->Wait",
 152         [rxrpc_client_uncount]          = "Uncoun",
 153 };
 154
 155 const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4] = {
 156         [rxrpc_transmit_wait]           = "WAI",
 157         [rxrpc_transmit_queue]          = "QUE",
 158         [rxrpc_transmit_queue_reqack]   = "QRA",
 159         [rxrpc_transmit_queue_last]     = "QLS",
 160         [rxrpc_transmit_rotate]         = "ROT",
 161         [rxrpc_transmit_end]            = "END",
 162 };
 163
 164 const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4] = {
 165         [rxrpc_receive_incoming]        = "INC",
 166         [rxrpc_receive_queue]           = "QUE",
 167         [rxrpc_receive_queue_last]      = "QLS",
 168         [rxrpc_receive_front]           = "FRN",
 169         [rxrpc_receive_rotate]          = "ROT",
 170         [rxrpc_receive_end]             = "END",
 171 };
 172
 173 const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5] = {
 174         [rxrpc_recvmsg_enter]           = "ENTR",
 175         [rxrpc_recvmsg_wait]            = "WAIT",
 176         [rxrpc_recvmsg_dequeue]         = "DEQU",
 177         [rxrpc_recvmsg_hole]            = "HOLE",
 178         [rxrpc_recvmsg_next]            = "NEXT",
 179         [rxrpc_recvmsg_cont]            = "CONT",
 180         [rxrpc_recvmsg_full]            = "FULL",
 181         [rxrpc_recvmsg_data_return]     = "DATA",
 182         [rxrpc_recvmsg_terminal]        = "TERM",
 183         [rxrpc_recvmsg_to_be_accepted]  = "TBAC",
 184         [rxrpc_recvmsg_return]          = "RETN",
 185 };
 186
 187 const char rxrpc_rtt_tx_traces[rxrpc_rtt_tx__nr_trace][5] = {
 188         [rxrpc_rtt_tx_ping]             = "PING",
 189         [rxrpc_rtt_tx_data]             = "DATA",
 190 };
 191
 192 const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5] = {
 193         [rxrpc_rtt_rx_ping_response]    = "PONG",
 194         [rxrpc_rtt_rx_requested_ack]    = "RACK",
 195 };