9749fd2bea
We need to generate a DELAY ACK from the service end of an operation if we
start doing the actual operation work and it takes longer than expected.
This will hard-ACK the request data and allow the client to release its
resources.
To make this work:
(1) We have to set the ack timer and propose an ACK when the call moves to
the RXRPC_CALL_SERVER_ACK_REQUEST and clear the pending ACK and cancel
the timer when we start transmitting the reply (the first DATA packet
of the reply implicitly ACKs the request phase).
(2) It must be possible to set the timer when the caller is holding
call->state_lock, so split the lock-getting part of the timer function
out.
(3) Add trace notes for the ACK we're requesting and the timer we clear.
Signed-off-by: David Howells <dhowells@redhat.com>
242 lines
7.7 KiB
C
242 lines
7.7 KiB
C
/* Miscellaneous bits
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*
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* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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/*
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* The maximum listening backlog queue size that may be set on a socket by
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* listen().
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*/
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unsigned int rxrpc_max_backlog __read_mostly = 10;
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/*
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* Maximum lifetime of a call (in mx).
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*/
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unsigned int rxrpc_max_call_lifetime = 60 * 1000;
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/*
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* How long to wait before scheduling ACK generation after seeing a
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* packet with RXRPC_REQUEST_ACK set (in ms).
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*/
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unsigned int rxrpc_requested_ack_delay = 1;
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/*
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* How long to wait before scheduling an ACK with subtype DELAY (in ms).
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*
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* We use this when we've received new data packets. If those packets aren't
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* all consumed within this time we will send a DELAY ACK if an ACK was not
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* requested to let the sender know it doesn't need to resend.
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*/
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unsigned int rxrpc_soft_ack_delay = 1 * 1000;
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/*
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* How long to wait before scheduling an ACK with subtype IDLE (in ms).
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*
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* We use this when we've consumed some previously soft-ACK'd packets when
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* further packets aren't immediately received to decide when to send an IDLE
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* ACK let the other end know that it can free up its Tx buffer space.
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*/
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unsigned int rxrpc_idle_ack_delay = 0.5 * 1000;
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/*
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* Receive window size in packets. This indicates the maximum number of
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* unconsumed received packets we're willing to retain in memory. Once this
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* limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
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* packets.
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*/
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unsigned int rxrpc_rx_window_size = RXRPC_INIT_RX_WINDOW_SIZE;
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#if (RXRPC_RXTX_BUFF_SIZE - 1) < RXRPC_INIT_RX_WINDOW_SIZE
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#error Need to reduce RXRPC_INIT_RX_WINDOW_SIZE
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#endif
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/*
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* Maximum Rx MTU size. This indicates to the sender the size of jumbo packet
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* made by gluing normal packets together that we're willing to handle.
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*/
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unsigned int rxrpc_rx_mtu = 5692;
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/*
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* The maximum number of fragments in a received jumbo packet that we tell the
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* sender that we're willing to handle.
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*/
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unsigned int rxrpc_rx_jumbo_max = 4;
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/*
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* Time till packet resend (in milliseconds).
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*/
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unsigned int rxrpc_resend_timeout = 4 * 1000;
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const char *const rxrpc_pkts[] = {
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"?00",
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"DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
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"?09", "?10", "?11", "?12", "VERSION", "?14", "?15"
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};
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const s8 rxrpc_ack_priority[] = {
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[0] = 0,
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[RXRPC_ACK_DELAY] = 1,
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[RXRPC_ACK_REQUESTED] = 2,
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[RXRPC_ACK_IDLE] = 3,
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[RXRPC_ACK_DUPLICATE] = 4,
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[RXRPC_ACK_OUT_OF_SEQUENCE] = 5,
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[RXRPC_ACK_EXCEEDS_WINDOW] = 6,
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[RXRPC_ACK_NOSPACE] = 7,
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[RXRPC_ACK_PING_RESPONSE] = 8,
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};
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const char rxrpc_ack_names[RXRPC_ACK__INVALID + 1][4] = {
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"---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY",
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"IDL", "-?-"
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};
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const char rxrpc_skb_traces[rxrpc_skb__nr_trace][7] = {
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[rxrpc_skb_rx_cleaned] = "Rx CLN",
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[rxrpc_skb_rx_freed] = "Rx FRE",
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[rxrpc_skb_rx_got] = "Rx GOT",
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[rxrpc_skb_rx_lost] = "Rx *L*",
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[rxrpc_skb_rx_received] = "Rx RCV",
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[rxrpc_skb_rx_purged] = "Rx PUR",
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[rxrpc_skb_rx_rotated] = "Rx ROT",
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[rxrpc_skb_rx_seen] = "Rx SEE",
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[rxrpc_skb_tx_cleaned] = "Tx CLN",
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[rxrpc_skb_tx_freed] = "Tx FRE",
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[rxrpc_skb_tx_got] = "Tx GOT",
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[rxrpc_skb_tx_new] = "Tx NEW",
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[rxrpc_skb_tx_rotated] = "Tx ROT",
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[rxrpc_skb_tx_seen] = "Tx SEE",
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};
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const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4] = {
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[rxrpc_conn_new_client] = "NWc",
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[rxrpc_conn_new_service] = "NWs",
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[rxrpc_conn_queued] = "QUE",
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[rxrpc_conn_seen] = "SEE",
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[rxrpc_conn_got] = "GOT",
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[rxrpc_conn_put_client] = "PTc",
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[rxrpc_conn_put_service] = "PTs",
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};
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const char rxrpc_client_traces[rxrpc_client__nr_trace][7] = {
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[rxrpc_client_activate_chans] = "Activa",
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[rxrpc_client_alloc] = "Alloc ",
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[rxrpc_client_chan_activate] = "ChActv",
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[rxrpc_client_chan_disconnect] = "ChDisc",
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[rxrpc_client_chan_pass] = "ChPass",
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[rxrpc_client_chan_unstarted] = "ChUnst",
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[rxrpc_client_cleanup] = "Clean ",
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[rxrpc_client_count] = "Count ",
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[rxrpc_client_discard] = "Discar",
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[rxrpc_client_duplicate] = "Duplic",
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[rxrpc_client_exposed] = "Expose",
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[rxrpc_client_replace] = "Replac",
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[rxrpc_client_to_active] = "->Actv",
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[rxrpc_client_to_culled] = "->Cull",
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[rxrpc_client_to_idle] = "->Idle",
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[rxrpc_client_to_inactive] = "->Inac",
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[rxrpc_client_to_waiting] = "->Wait",
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[rxrpc_client_uncount] = "Uncoun",
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};
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const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4] = {
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[rxrpc_transmit_wait] = "WAI",
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[rxrpc_transmit_queue] = "QUE",
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[rxrpc_transmit_queue_last] = "QLS",
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[rxrpc_transmit_rotate] = "ROT",
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[rxrpc_transmit_rotate_last] = "RLS",
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[rxrpc_transmit_await_reply] = "AWR",
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[rxrpc_transmit_end] = "END",
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};
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const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4] = {
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[rxrpc_receive_incoming] = "INC",
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[rxrpc_receive_queue] = "QUE",
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[rxrpc_receive_queue_last] = "QLS",
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[rxrpc_receive_front] = "FRN",
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[rxrpc_receive_rotate] = "ROT",
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[rxrpc_receive_end] = "END",
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};
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const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5] = {
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[rxrpc_recvmsg_enter] = "ENTR",
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[rxrpc_recvmsg_wait] = "WAIT",
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[rxrpc_recvmsg_dequeue] = "DEQU",
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[rxrpc_recvmsg_hole] = "HOLE",
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[rxrpc_recvmsg_next] = "NEXT",
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[rxrpc_recvmsg_cont] = "CONT",
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[rxrpc_recvmsg_full] = "FULL",
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[rxrpc_recvmsg_data_return] = "DATA",
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[rxrpc_recvmsg_terminal] = "TERM",
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[rxrpc_recvmsg_to_be_accepted] = "TBAC",
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[rxrpc_recvmsg_return] = "RETN",
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};
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const char rxrpc_rtt_tx_traces[rxrpc_rtt_tx__nr_trace][5] = {
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[rxrpc_rtt_tx_ping] = "PING",
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[rxrpc_rtt_tx_data] = "DATA",
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};
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const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5] = {
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[rxrpc_rtt_rx_ping_response] = "PONG",
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[rxrpc_rtt_rx_requested_ack] = "RACK",
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};
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const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8] = {
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[rxrpc_timer_begin] = "Begin ",
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[rxrpc_timer_expired] = "*EXPR*",
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[rxrpc_timer_init_for_reply] = "IniRpl",
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[rxrpc_timer_init_for_send_reply] = "SndRpl",
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[rxrpc_timer_set_for_ack] = "SetAck",
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[rxrpc_timer_set_for_ping] = "SetPng",
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[rxrpc_timer_set_for_send] = "SetTx ",
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[rxrpc_timer_set_for_resend] = "SetRTx",
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};
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const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8] = {
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[rxrpc_propose_ack_client_tx_end] = "ClTxEnd",
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[rxrpc_propose_ack_input_data] = "DataIn ",
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[rxrpc_propose_ack_ping_for_lost_ack] = "LostAck",
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[rxrpc_propose_ack_ping_for_lost_reply] = "LostRpl",
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[rxrpc_propose_ack_ping_for_params] = "Params ",
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[rxrpc_propose_ack_processing_op] = "ProcOp ",
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[rxrpc_propose_ack_respond_to_ack] = "Rsp2Ack",
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[rxrpc_propose_ack_respond_to_ping] = "Rsp2Png",
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[rxrpc_propose_ack_retry_tx] = "RetryTx",
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[rxrpc_propose_ack_rotate_rx] = "RxAck ",
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[rxrpc_propose_ack_terminal_ack] = "ClTerm ",
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};
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const char *const rxrpc_propose_ack_outcomes[rxrpc_propose_ack__nr_outcomes] = {
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[rxrpc_propose_ack_use] = "",
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[rxrpc_propose_ack_update] = " Update",
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[rxrpc_propose_ack_subsume] = " Subsume",
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};
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const char rxrpc_congest_modes[NR__RXRPC_CONGEST_MODES][10] = {
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[RXRPC_CALL_SLOW_START] = "SlowStart",
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[RXRPC_CALL_CONGEST_AVOIDANCE] = "CongAvoid",
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[RXRPC_CALL_PACKET_LOSS] = "PktLoss ",
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[RXRPC_CALL_FAST_RETRANSMIT] = "FastReTx ",
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};
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const char rxrpc_congest_changes[rxrpc_congest__nr_change][9] = {
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[rxrpc_cong_begin_retransmission] = " Retrans",
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[rxrpc_cong_cleared_nacks] = " Cleared",
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[rxrpc_cong_new_low_nack] = " NewLowN",
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[rxrpc_cong_no_change] = "",
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[rxrpc_cong_progress] = " Progres",
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[rxrpc_cong_retransmit_again] = " ReTxAgn",
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[rxrpc_cong_rtt_window_end] = " RttWinE",
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[rxrpc_cong_saw_nack] = " SawNack",
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};
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