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 char *const rxrpc_pkts[] = {
  81         "?00",
  82         "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
  83         "?09", "?10", "?11", "?12", "VERSION", "?14", "?15"
  84 };
  85
  86 const s8 rxrpc_ack_priority[] = {
  87         [0]                             = 0,
  88         [RXRPC_ACK_DELAY]               = 1,
  89         [RXRPC_ACK_REQUESTED]           = 2,
  90         [RXRPC_ACK_IDLE]                = 3,
  91         [RXRPC_ACK_DUPLICATE]           = 4,
  92         [RXRPC_ACK_OUT_OF_SEQUENCE]     = 5,
  93         [RXRPC_ACK_EXCEEDS_WINDOW]      = 6,
  94         [RXRPC_ACK_NOSPACE]             = 7,
  95         [RXRPC_ACK_PING_RESPONSE]       = 8,
  96 };
  97
  98 const char rxrpc_ack_names[RXRPC_ACK__INVALID + 1][4] = {
  99         "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY",
 100         "IDL", "-?-"
 101 };
 102
 103 const char rxrpc_skb_traces[rxrpc_skb__nr_trace][7] = {
 104         [rxrpc_skb_rx_cleaned]          = "Rx CLN",
 105         [rxrpc_skb_rx_freed]            = "Rx FRE",
 106         [rxrpc_skb_rx_got]              = "Rx GOT",
 107         [rxrpc_skb_rx_lost]             = "Rx *L*",
 108         [rxrpc_skb_rx_received]         = "Rx RCV",
 109         [rxrpc_skb_rx_purged]           = "Rx PUR",
 110         [rxrpc_skb_rx_rotated]          = "Rx ROT",
 111         [rxrpc_skb_rx_seen]             = "Rx SEE",
 112         [rxrpc_skb_tx_cleaned]          = "Tx CLN",
 113         [rxrpc_skb_tx_freed]            = "Tx FRE",
 114         [rxrpc_skb_tx_got]              = "Tx GOT",
 115         [rxrpc_skb_tx_new]              = "Tx NEW",
 116         [rxrpc_skb_tx_rotated]          = "Tx ROT",
 117         [rxrpc_skb_tx_seen]             = "Tx SEE",
 118 };
 119
 120 const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4] = {
 121         [rxrpc_conn_new_client]         = "NWc",
 122         [rxrpc_conn_new_service]        = "NWs",
 123         [rxrpc_conn_queued]             = "QUE",
 124         [rxrpc_conn_seen]               = "SEE",
 125         [rxrpc_conn_got]                = "GOT",
 126         [rxrpc_conn_put_client]         = "PTc",
 127         [rxrpc_conn_put_service]        = "PTs",
 128 };
 129
 130 const char rxrpc_client_traces[rxrpc_client__nr_trace][7] = {
 131         [rxrpc_client_activate_chans]   = "Activa",
 132         [rxrpc_client_alloc]            = "Alloc ",
 133         [rxrpc_client_chan_activate]    = "ChActv",
 134         [rxrpc_client_chan_disconnect]  = "ChDisc",
 135         [rxrpc_client_chan_pass]        = "ChPass",
 136         [rxrpc_client_chan_unstarted]   = "ChUnst",
 137         [rxrpc_client_cleanup]          = "Clean ",
 138         [rxrpc_client_count]            = "Count ",
 139         [rxrpc_client_discard]          = "Discar",
 140         [rxrpc_client_duplicate]        = "Duplic",
 141         [rxrpc_client_exposed]          = "Expose",
 142         [rxrpc_client_replace]          = "Replac",
 143         [rxrpc_client_to_active]        = "->Actv",
 144         [rxrpc_client_to_culled]        = "->Cull",
 145         [rxrpc_client_to_idle]          = "->Idle",
 146         [rxrpc_client_to_inactive]      = "->Inac",
 147         [rxrpc_client_to_waiting]       = "->Wait",
 148         [rxrpc_client_uncount]          = "Uncoun",
 149 };
 150
 151 const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4] = {
 152         [rxrpc_transmit_wait]           = "WAI",
 153         [rxrpc_transmit_queue]          = "QUE",
 154         [rxrpc_transmit_queue_last]     = "QLS",
 155         [rxrpc_transmit_rotate]         = "ROT",
 156         [rxrpc_transmit_rotate_last]    = "RLS",
 157         [rxrpc_transmit_await_reply]    = "AWR",
 158         [rxrpc_transmit_end]            = "END",
 159 };
 160
 161 const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4] = {
 162         [rxrpc_receive_incoming]        = "INC",
 163         [rxrpc_receive_queue]           = "QUE",
 164         [rxrpc_receive_queue_last]      = "QLS",
 165         [rxrpc_receive_front]           = "FRN",
 166         [rxrpc_receive_rotate]          = "ROT",
 167         [rxrpc_receive_end]             = "END",
 168 };
 169
 170 const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5] = {
 171         [rxrpc_recvmsg_enter]           = "ENTR",
 172         [rxrpc_recvmsg_wait]            = "WAIT",
 173         [rxrpc_recvmsg_dequeue]         = "DEQU",
 174         [rxrpc_recvmsg_hole]            = "HOLE",
 175         [rxrpc_recvmsg_next]            = "NEXT",
 176         [rxrpc_recvmsg_cont]            = "CONT",
 177         [rxrpc_recvmsg_full]            = "FULL",
 178         [rxrpc_recvmsg_data_return]     = "DATA",
 179         [rxrpc_recvmsg_terminal]        = "TERM",
 180         [rxrpc_recvmsg_to_be_accepted]  = "TBAC",
 181         [rxrpc_recvmsg_return]          = "RETN",
 182 };
 183
 184 const char rxrpc_rtt_tx_traces[rxrpc_rtt_tx__nr_trace][5] = {
 185         [rxrpc_rtt_tx_ping]             = "PING",
 186         [rxrpc_rtt_tx_data]             = "DATA",
 187 };
 188
 189 const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5] = {
 190         [rxrpc_rtt_rx_ping_response]    = "PONG",
 191         [rxrpc_rtt_rx_requested_ack]    = "RACK",
 192 };
 193
 194 const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8] = {
 195         [rxrpc_timer_begin]                     = "Begin ",
 196         [rxrpc_timer_expired]                   = "*EXPR*",
 197         [rxrpc_timer_init_for_reply]            = "IniRpl",
 198         [rxrpc_timer_init_for_send_reply]       = "SndRpl",
 199         [rxrpc_timer_set_for_ack]               = "SetAck",
 200         [rxrpc_timer_set_for_ping]              = "SetPng",
 201         [rxrpc_timer_set_for_send]              = "SetTx ",
 202         [rxrpc_timer_set_for_resend]            = "SetRTx",
 203 };
 204
 205 const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8] = {
 206         [rxrpc_propose_ack_client_tx_end]       = "ClTxEnd",
 207         [rxrpc_propose_ack_input_data]          = "DataIn ",
 208         [rxrpc_propose_ack_ping_for_lost_ack]   = "LostAck",
 209         [rxrpc_propose_ack_ping_for_lost_reply] = "LostRpl",
 210         [rxrpc_propose_ack_ping_for_params]     = "Params ",
 211         [rxrpc_propose_ack_processing_op]       = "ProcOp ",
 212         [rxrpc_propose_ack_respond_to_ack]      = "Rsp2Ack",
 213         [rxrpc_propose_ack_respond_to_ping]     = "Rsp2Png",
 214         [rxrpc_propose_ack_retry_tx]            = "RetryTx",
 215         [rxrpc_propose_ack_rotate_rx]           = "RxAck  ",
 216         [rxrpc_propose_ack_terminal_ack]        = "ClTerm ",
 217 };
 218
 219 const char *const rxrpc_propose_ack_outcomes[rxrpc_propose_ack__nr_outcomes] = {
 220         [rxrpc_propose_ack_use]                 = "",
 221         [rxrpc_propose_ack_update]              = " Update",
 222         [rxrpc_propose_ack_subsume]             = " Subsume",
 223 };
 224
 225 const char rxrpc_congest_modes[NR__RXRPC_CONGEST_MODES][10] = {
 226         [RXRPC_CALL_SLOW_START]         = "SlowStart",
 227         [RXRPC_CALL_CONGEST_AVOIDANCE]  = "CongAvoid",
 228         [RXRPC_CALL_PACKET_LOSS]        = "PktLoss  ",
 229         [RXRPC_CALL_FAST_RETRANSMIT]    = "FastReTx ",
 230 };
 231
 232 const char rxrpc_congest_changes[rxrpc_congest__nr_change][9] = {
 233         [rxrpc_cong_begin_retransmission]       = " Retrans",
 234         [rxrpc_cong_cleared_nacks]              = " Cleared",
 235         [rxrpc_cong_new_low_nack]               = " NewLowN",
 236         [rxrpc_cong_no_change]                  = "",
 237         [rxrpc_cong_progress]                   = " Progres",
 238         [rxrpc_cong_retransmit_again]           = " ReTxAgn",
 239         [rxrpc_cong_rtt_window_end]             = " RttWinE",
 240         [rxrpc_cong_saw_nack]                   = " SawNack",
 241 };