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encode_dmabuf_v8
spice/server/red-channel-client.cpp
Rosen Penev e2848118bf clang-tidy: use C++ casting 
Found with google-readability-casting

Signed-off-by: Rosen Penev <rosenp@gmail.com>
2021-09-28 09:36:49 +01:00

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/*
Copyright (C) 2009-2016 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <cerrno>
#include <cstdint>
#include <cstdio>
#include <fcntl.h>
#include <glib.h>
#include <unistd.h>
#ifndef _WIN32
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/ioctl.h>
#endif
#ifdef HAVE_LINUX_SOCKIOS_H
#include <linux/sockios.h> /* SIOCOUTQ */
#endif
#include <common/generated_server_marshallers.h>
#include "red-channel-client.h"
#include "red-client.h"
#define CLIENT_ACK_WINDOW 20
#define MAX_HEADER_SIZE sizeof(SpiceDataHeader)
#ifndef IOV_MAX
#define IOV_MAX 1024
#endif
struct SpiceDataHeaderOpaque;
using get_msg_type_proc = uint16_t (*)(SpiceDataHeaderOpaque *header);
using get_msg_size_proc = uint32_t (*)(SpiceDataHeaderOpaque *header);
using set_msg_type_proc = void (*)(SpiceDataHeaderOpaque *header, uint16_t type);
using set_msg_size_proc = void (*)(SpiceDataHeaderOpaque *header, uint32_t size);
using set_msg_serial_proc = void (*)(SpiceDataHeaderOpaque *header, uint64_t serial);
using set_msg_sub_list_proc = void (*)(SpiceDataHeaderOpaque *header, uint32_t sub_list);
struct SpiceDataHeaderOpaque {
uint8_t *data;
uint16_t header_size;
set_msg_type_proc set_msg_type;
set_msg_size_proc set_msg_size;
set_msg_serial_proc set_msg_serial;
set_msg_sub_list_proc set_msg_sub_list;
get_msg_type_proc get_msg_type;
get_msg_size_proc get_msg_size;
};
enum QosPingState {
PING_STATE_NONE,
PING_STATE_TIMER,
PING_STATE_WARMUP,
PING_STATE_LATENCY,
};
struct RedChannelClientLatencyMonitor {
QosPingState state;
uint64_t last_pong_time;
SpiceTimer *timer;
uint32_t timeout;
uint32_t id;
bool tcp_nodelay;
bool warmup_was_sent;
int64_t roundtrip;
};
enum ConnectivityState {
CONNECTIVITY_STATE_CONNECTED,
CONNECTIVITY_STATE_BLOCKED,
CONNECTIVITY_STATE_WAIT_PONG,
CONNECTIVITY_STATE_DISCONNECTED,
};
struct RedChannelClientConnectivityMonitor {
ConnectivityState state;
bool sent_bytes;
bool received_bytes;
uint32_t timeout;
SpiceTimer *timer;
};
struct OutgoingMessageBuffer {
int pos;
int size;
};
struct IncomingMessageBuffer {
uint8_t header_buf[MAX_HEADER_SIZE];
SpiceDataHeaderOpaque header;
uint32_t header_pos;
uint8_t *msg; // data of the msg following the header. allocated by alloc_msg_buf.
uint32_t msg_pos;
};
struct RedChannelClientPrivate
{
SPICE_CXX_GLIB_ALLOCATOR
RedChannelClientPrivate(RedChannel *channel,
RedClient *client,
RedStream *stream,
RedChannelCapabilities *caps,
bool monitor_latency);
~RedChannelClientPrivate();
red::shared_ptr<RedChannel> channel;
RedClient *const client;
RedStream *const stream;
bool monitor_latency;
struct {
uint32_t generation;
uint32_t client_generation;
uint32_t messages_window;
uint32_t client_window;
} ack_data;
struct {
/* this can be either main.marshaller or urgent.marshaller */
SpiceMarshaller *marshaller;
SpiceDataHeaderOpaque header;
uint32_t size;
bool blocked;
uint64_t last_sent_serial;
struct {
SpiceMarshaller *marshaller;
uint8_t *header_data;
} main;
struct {
SpiceMarshaller *marshaller;
} urgent;
} send_data;
bool block_read;
bool during_send;
RedChannelClient::Pipe pipe;
RedChannelCapabilities remote_caps;
bool is_mini_header;
bool wait_migrate_data;
bool wait_migrate_flush_mark;
RedChannelClientLatencyMonitor latency_monitor;
RedChannelClientConnectivityMonitor connectivity_monitor;
IncomingMessageBuffer incoming;
OutgoingMessageBuffer outgoing;
RedStatCounter out_messages;
RedStatCounter out_bytes;
inline RedPipeItemPtr pipe_item_get();
inline void pipe_remove(RedPipeItem *item);
void handle_pong(SpiceMsgPing *ping);
inline void set_message_serial(uint64_t serial);
void pipe_clear();
void data_sent(int n);
void data_read(int n);
inline int get_out_msg_size();
inline int prepare_out_msg(struct iovec *vec, int vec_size, int pos);
inline void set_blocked();
void reset_send_data();
void seamless_migration_done();
void clear_sent_item();
void restart_ping_timer();
void start_ping_timer(uint32_t timeout);
void cancel_ping_timer();
inline int urgent_marshaller_is_active();
inline int waiting_for_ack();
inline void restore_main_sender();
void watch_update_mask(int event_mask);
};
static void full_header_set_msg_type(SpiceDataHeaderOpaque *header, uint16_t type);
static void full_header_set_msg_size(SpiceDataHeaderOpaque *header, uint32_t size);
static void full_header_set_msg_serial(SpiceDataHeaderOpaque *header, uint64_t serial);
static void full_header_set_msg_sub_list(SpiceDataHeaderOpaque *header, uint32_t sub_list);
static uint16_t full_header_get_msg_type(SpiceDataHeaderOpaque *header);
static uint32_t full_header_get_msg_size(SpiceDataHeaderOpaque *header);
static const SpiceDataHeaderOpaque full_header_wrapper = {nullptr, sizeof(SpiceDataHeader),
full_header_set_msg_type,
full_header_set_msg_size,
full_header_set_msg_serial,
full_header_set_msg_sub_list,
full_header_get_msg_type,
full_header_get_msg_size};
static void mini_header_set_msg_type(SpiceDataHeaderOpaque *header, uint16_t type);
static void mini_header_set_msg_size(SpiceDataHeaderOpaque *header, uint32_t size);
static void mini_header_set_msg_serial(SpiceDataHeaderOpaque *header, uint64_t serial);
static void mini_header_set_msg_sub_list(SpiceDataHeaderOpaque *header, uint32_t sub_list);
static uint16_t mini_header_get_msg_type(SpiceDataHeaderOpaque *header);
static uint32_t mini_header_get_msg_size(SpiceDataHeaderOpaque *header);
static const SpiceDataHeaderOpaque mini_header_wrapper = {nullptr, sizeof(SpiceMiniDataHeader),
mini_header_set_msg_type,
mini_header_set_msg_size,
mini_header_set_msg_serial,
mini_header_set_msg_sub_list,
mini_header_get_msg_type,
mini_header_get_msg_size};
/*
* When an error occurs over a channel, we treat it as a warning
* for spice-server and shutdown the channel.
*/
#define spice_channel_client_error(rcc, ...) \
do { \
red_channel_warning(rcc->priv->channel, __VA_ARGS__); \
rcc->shutdown(); \
} while (0)
#define PING_TEST_TIMEOUT_MS (MSEC_PER_SEC * 15)
#define PING_TEST_LONG_TIMEOUT_MS (MSEC_PER_SEC * 60 * 5)
#define PING_TEST_IDLE_NET_TIMEOUT_MS (MSEC_PER_SEC / 10)
struct RedEmptyMsgPipeItem: public RedPipeItemNum<RED_PIPE_ITEM_TYPE_EMPTY_MSG> {
int msg;
};
struct MarkerPipeItem: public RedPipeItemNum<RED_PIPE_ITEM_TYPE_MARKER> {
bool item_sent;
};
void RedChannelClientPrivate::start_ping_timer(uint32_t timeout)
{
if (!latency_monitor.timer) {
return;
}
if (latency_monitor.state != PING_STATE_NONE) {
return;
}
latency_monitor.state = PING_STATE_TIMER;
red_timer_start(latency_monitor.timer, timeout);
}
void RedChannelClientPrivate::cancel_ping_timer()
{
if (!latency_monitor.timer) {
return;
}
if (latency_monitor.state != PING_STATE_TIMER) {
return;
}
red_timer_cancel(latency_monitor.timer);
latency_monitor.state = PING_STATE_NONE;
}
void RedChannelClientPrivate::restart_ping_timer()
{
uint64_t passed, timeout;
if (!latency_monitor.timer) {
return;
}
passed = (spice_get_monotonic_time_ns() - latency_monitor.last_pong_time) / NSEC_PER_MILLISEC;
timeout = PING_TEST_IDLE_NET_TIMEOUT_MS;
if (passed < latency_monitor.timeout) {
timeout += latency_monitor.timeout - passed;
}
start_ping_timer(timeout);
}
RedChannelClientPrivate::RedChannelClientPrivate(RedChannel *init_channel,
RedClient *init_client,
RedStream *init_stream,
RedChannelCapabilities *caps,
bool init_monitor_latency):
channel(init_channel),
client(init_client), stream(init_stream),
monitor_latency(init_monitor_latency)
{
// blocks send message (maybe use send_data.blocked + block flags)
ack_data.messages_window = ~0;
ack_data.client_generation = ~0;
ack_data.client_window = CLIENT_ACK_WINDOW;
send_data.main.marshaller = spice_marshaller_new();
send_data.urgent.marshaller = spice_marshaller_new();
send_data.marshaller = send_data.main.marshaller;
red_channel_capabilities_reset(&remote_caps);
red_channel_capabilities_init(&remote_caps, caps);
outgoing.pos = 0;
outgoing.size = 0;
if (test_capability(remote_caps.common_caps, remote_caps.num_common_caps,
SPICE_COMMON_CAP_MINI_HEADER)) {
incoming.header = mini_header_wrapper;
send_data.header = mini_header_wrapper;
is_mini_header = TRUE;
} else {
incoming.header = full_header_wrapper;
send_data.header = full_header_wrapper;
is_mini_header = FALSE;
}
incoming.header.data = incoming.header_buf;
RedsState* reds = channel->get_server();
const RedStatNode *node = channel->get_stat_node();
stat_init_counter(&out_messages, reds, node, "out_messages", TRUE);
stat_init_counter(&out_bytes, reds, node, "out_bytes", TRUE);
}
RedChannelClientPrivate::~RedChannelClientPrivate()
{
red_timer_remove(latency_monitor.timer);
latency_monitor.timer = nullptr;
red_timer_remove(connectivity_monitor.timer);
connectivity_monitor.timer = nullptr;
red_stream_free(stream);
if (send_data.main.marshaller) {
spice_marshaller_destroy(send_data.main.marshaller);
}
if (send_data.urgent.marshaller) {
spice_marshaller_destroy(send_data.urgent.marshaller);
}
red_channel_capabilities_reset(&remote_caps);
}
/* This even empty is better to by declared here to make sure
* we call the right delete for priv field
*/
RedChannelClient::~RedChannelClient() = default;
RedChannelClient::RedChannelClient(RedChannel *channel,
RedClient *client,
RedStream *stream,
RedChannelCapabilities *caps,
bool monitor_latency):
priv(new RedChannelClientPrivate(channel, client, stream, caps, monitor_latency))
{
}
RedChannel* RedChannelClient::get_channel()
{
return priv->channel.get();
}
void RedChannelClientPrivate::data_sent(int n)
{
if (connectivity_monitor.timer) {
connectivity_monitor.sent_bytes = true;
}
stat_inc_counter(out_bytes, n);
}
void RedChannelClientPrivate::data_read(int n)
{
if (connectivity_monitor.timer) {
connectivity_monitor.received_bytes = true;
}
}
inline int RedChannelClientPrivate::get_out_msg_size()
{
return send_data.size;
}
inline int RedChannelClientPrivate::prepare_out_msg(struct iovec *vec, int vec_size, int pos)
{
return spice_marshaller_fill_iovec(send_data.marshaller,
vec, vec_size, pos);
}
inline void RedChannelClientPrivate::set_blocked()
{
send_data.blocked = true;
}
inline int RedChannelClientPrivate::urgent_marshaller_is_active()
{
return send_data.marshaller == send_data.urgent.marshaller;
}
void RedChannelClientPrivate::reset_send_data()
{
spice_marshaller_reset(send_data.marshaller);
send_data.header.data = spice_marshaller_reserve_space(send_data.marshaller,
send_data.header.header_size);
spice_marshaller_set_base(send_data.marshaller, send_data.header.header_size);
send_data.header.set_msg_type(&send_data.header, 0);
send_data.header.set_msg_size(&send_data.header, 0);
if (!is_mini_header) {
spice_assert(send_data.marshaller != send_data.urgent.marshaller);
send_data.header.set_msg_sub_list(&send_data.header, 0);
}
}
void RedChannelClient::send_set_ack()
{
SpiceMsgSetAck ack;
init_send_data(SPICE_MSG_SET_ACK);
ack.generation = ++priv->ack_data.generation;
ack.window = priv->ack_data.client_window;
priv->ack_data.messages_window = 0;
spice_marshall_msg_set_ack(priv->send_data.marshaller, &ack);
begin_send_message();
}
void RedChannelClient::send_migrate()
{
SpiceMsgMigrate migrate;
init_send_data(SPICE_MSG_MIGRATE);
migrate.flags = priv->channel->migration_flags();
spice_marshall_msg_migrate(priv->send_data.marshaller, &migrate);
if (migrate.flags & SPICE_MIGRATE_NEED_FLUSH) {
priv->wait_migrate_flush_mark = TRUE;
}
begin_send_message();
}
void RedChannelClient::send_ping()
{
SpiceMsgPing ping;
if (!priv->latency_monitor.warmup_was_sent) { // latency test start
int delay_val;
priv->latency_monitor.warmup_was_sent = true;
/*
* When testing latency, TCP_NODELAY must be switched on, otherwise,
* sending the ping message is delayed by Nagle algorithm, and the
* roundtrip measurement is less accurate (bigger).
*/
priv->latency_monitor.tcp_nodelay = true;
delay_val = red_stream_get_no_delay(priv->stream);
if (delay_val != -1) {
priv->latency_monitor.tcp_nodelay = delay_val;
if (!delay_val) {
red_stream_set_no_delay(priv->stream, TRUE);
}
}
}
init_send_data(SPICE_MSG_PING);
ping.id = priv->latency_monitor.id;
ping.timestamp = spice_get_monotonic_time_ns();
spice_marshall_msg_ping(priv->send_data.marshaller, &ping);
begin_send_message();
}
void RedChannelClient::send_empty_msg(RedPipeItem *base)
{
auto msg_pipe_item = static_cast<RedEmptyMsgPipeItem*>(base);
init_send_data(msg_pipe_item->msg);
begin_send_message();
}
void RedChannelClient::send_any_item(RedPipeItem *item)
{
spice_assert(no_item_being_sent());
priv->reset_send_data();
switch (item->type) {
case RED_PIPE_ITEM_TYPE_SET_ACK:
send_set_ack();
break;
case RED_PIPE_ITEM_TYPE_MIGRATE:
send_migrate();
break;
case RED_PIPE_ITEM_TYPE_EMPTY_MSG:
send_empty_msg(item);
break;
case RED_PIPE_ITEM_TYPE_PING:
send_ping();
break;
case RED_PIPE_ITEM_TYPE_MARKER:
static_cast<MarkerPipeItem*>(item)->item_sent = true;
break;
default:
send_item(item);
break;
}
}
inline void RedChannelClientPrivate::restore_main_sender()
{
send_data.marshaller = send_data.main.marshaller;
send_data.header.data = send_data.main.header_data;
}
void RedChannelClient::msg_sent()
{
#ifndef _WIN32
int fd;
if (spice_marshaller_get_fd(priv->send_data.marshaller, &fd)) {
if (red_stream_send_msgfd(priv->stream, fd) < 0) {
perror("sendfd");
disconnect();
if (fd != -1)
close(fd);
return;
}
if (fd != -1)
close(fd);
}
#endif
priv->clear_sent_item();
if (priv->urgent_marshaller_is_active()) {
priv->restore_main_sender();
spice_assert(priv->send_data.header.data != nullptr);
begin_send_message();
} else {
if (priv->pipe.empty()) {
/* It is possible that the socket will become idle, so we may be able to test latency */
priv->restart_ping_timer();
}
}
}
static RedChannelClient::Pipe::iterator
find_pipe_item(RedChannelClient::Pipe &pipe, const RedPipeItem *item)
{
return std::find_if(pipe.begin(), pipe.end(),
[=](const RedPipeItemPtr& p) -> bool {
return p.get() == item;
});
}
static RedChannelClient::Pipe::const_iterator
find_pipe_item(const RedChannelClient::Pipe &pipe, const RedPipeItem *item)
{
return std::find_if(pipe.begin(), pipe.end(),
[=](const RedPipeItemPtr& p) -> bool {
return p.get() == item;
});
}
void RedChannelClientPrivate::pipe_remove(RedPipeItem *item)
{
auto i = find_pipe_item(pipe, item);
if (i != pipe.end()) {
pipe.erase(i);
}
}
bool RedChannelClient::test_remote_common_cap(uint32_t cap) const
{
return test_capability(priv->remote_caps.common_caps,
priv->remote_caps.num_common_caps,
cap);
}
bool RedChannelClient::test_remote_cap(uint32_t cap) const
{
return test_capability(priv->remote_caps.caps,
priv->remote_caps.num_caps,
cap);
}
void RedChannelClient::push_ping()
{
spice_assert(priv->latency_monitor.state == PING_STATE_NONE);
priv->latency_monitor.state = PING_STATE_WARMUP;
priv->latency_monitor.warmup_was_sent = false;
priv->latency_monitor.id = rand();
pipe_add_type(RED_PIPE_ITEM_TYPE_PING);
pipe_add_type(RED_PIPE_ITEM_TYPE_PING);
}
void RedChannelClient::ping_timer(RedChannelClient *rcc)
{
red::shared_ptr<RedChannelClient> hold_rcc(rcc);
spice_assert(rcc->priv->latency_monitor.state == PING_STATE_TIMER);
rcc->priv->cancel_ping_timer();
#ifdef HAVE_LINUX_SOCKIOS_H /* SIOCOUTQ is a Linux only ioctl on sockets. */
int so_unsent_size = 0;
/* retrieving the occupied size of the socket's tcp send buffer (unacked + unsent) */
if (ioctl(rcc->priv->stream->socket, SIOCOUTQ, &so_unsent_size) == -1) {
red_channel_warning(rcc->get_channel(),
"ioctl(SIOCOUTQ) failed, %s", strerror(errno));
}
if (so_unsent_size > 0) {
/* tcp send buffer is still occupied. rescheduling ping */
rcc->priv->start_ping_timer(PING_TEST_IDLE_NET_TIMEOUT_MS);
return;
}
#endif /* ifdef HAVE_LINUX_SOCKIOS_H */
/* More portable alternative code path (less accurate but avoids bogus ioctls)*/
rcc->push_ping();
}
inline int RedChannelClientPrivate::waiting_for_ack()
{
gboolean handle_acks = channel->handle_acks();
return (handle_acks && (ack_data.messages_window >
ack_data.client_window * 2));
}
/*
* When a connection is not alive (and we can't detect it via a socket error), we
* reach one of these 2 states:
* (1) Sending msgs is blocked: either writes return EAGAIN
* or we are missing MSGC_ACK from the client.
* (2) MSG_PING was sent without receiving a MSGC_PONG in reply.
*
* The connectivity_timer callback tests if the channel's state matches one of the above.
* In case it does, on the next time the timer is called, it checks if the connection has
* been idle during the time that passed since the previous timer call. If the connection
* has been idle, we consider the client as disconnected.
*/
void RedChannelClient::connectivity_timer(RedChannelClient *rcc)
{
RedChannelClientConnectivityMonitor *monitor = &rcc->priv->connectivity_monitor;
int is_alive = TRUE;
red::shared_ptr<RedChannelClient> hold_rcc(rcc);
if (monitor->state == CONNECTIVITY_STATE_BLOCKED) {
if (!monitor->received_bytes && !monitor->sent_bytes) {
if (!rcc->is_blocked() && !rcc->priv->waiting_for_ack()) {
spice_error("mismatch between rcc-state and connectivity-state");
}
spice_debug("rcc is blocked; connection is idle");
is_alive = FALSE;
}
} else if (monitor->state == CONNECTIVITY_STATE_WAIT_PONG) {
if (!monitor->received_bytes) {
if (rcc->priv->latency_monitor.state != PING_STATE_WARMUP &&
rcc->priv->latency_monitor.state != PING_STATE_LATENCY) {
spice_error("mismatch between rcc-state and connectivity-state");
}
spice_debug("rcc waits for pong; connection is idle");
is_alive = FALSE;
}
}
if (is_alive) {
monitor->received_bytes = false;
monitor->sent_bytes = false;
if (rcc->is_blocked() || rcc->priv->waiting_for_ack()) {
monitor->state = CONNECTIVITY_STATE_BLOCKED;
} else if (rcc->priv->latency_monitor.state == PING_STATE_WARMUP ||
rcc->priv->latency_monitor.state == PING_STATE_LATENCY) {
monitor->state = CONNECTIVITY_STATE_WAIT_PONG;
} else {
monitor->state = CONNECTIVITY_STATE_CONNECTED;
}
red_timer_start(monitor->timer, monitor->timeout);
} else {
monitor->state = CONNECTIVITY_STATE_DISCONNECTED;
red_channel_warning(rcc->priv->channel.get(),
"rcc %p has been unresponsive for more than %u ms, disconnecting",
rcc, monitor->timeout);
rcc->disconnect();
}
}
void RedChannelClient::start_connectivity_monitoring(uint32_t timeout_ms)
{
SpiceCoreInterfaceInternal *core = priv->channel->get_core_interface();
if (!is_connected()) {
return;
}
spice_debug("trace");
spice_assert(timeout_ms > 0);
/*
* If latency_monitor is not active, we activate it in order to enable
* periodic ping messages so that we will be be able to identify a disconnected
* channel-client even if there are no ongoing channel specific messages
* on this channel.
*/
if (priv->latency_monitor.timer == nullptr) {
priv->latency_monitor.timer =
core->timer_new(ping_timer, this);
priv->latency_monitor.roundtrip = -1;
} else {
priv->cancel_ping_timer();
}
priv->latency_monitor.timeout = PING_TEST_TIMEOUT_MS;
if (!priv->client->during_migrate_at_target()) {
priv->start_ping_timer(PING_TEST_IDLE_NET_TIMEOUT_MS);
}
if (priv->connectivity_monitor.timer == nullptr) {
priv->connectivity_monitor.state = CONNECTIVITY_STATE_CONNECTED;
priv->connectivity_monitor.timer =
core->timer_new(connectivity_timer, this);
priv->connectivity_monitor.timeout = timeout_ms;
if (!priv->client->during_migrate_at_target()) {
red_timer_start(priv->connectivity_monitor.timer,
priv->connectivity_monitor.timeout);
}
}
}
static void red_channel_client_event(int fd, int event, RedChannelClient *rcc)
{
red::shared_ptr<RedChannelClient> hold_rcc(rcc);
if (event & SPICE_WATCH_EVENT_READ) {
rcc->receive();
}
if (event & SPICE_WATCH_EVENT_WRITE) {
rcc->push();
}
}
static uint32_t full_header_get_msg_size(SpiceDataHeaderOpaque *header)
{
return GUINT32_FROM_LE(((SpiceDataHeader *)header->data)->size);
}
static uint32_t mini_header_get_msg_size(SpiceDataHeaderOpaque *header)
{
return GUINT32_FROM_LE(((SpiceMiniDataHeader *)header->data)->size);
}
static uint16_t full_header_get_msg_type(SpiceDataHeaderOpaque *header)
{
return GUINT16_FROM_LE(((SpiceDataHeader *)header->data)->type);
}
static uint16_t mini_header_get_msg_type(SpiceDataHeaderOpaque *header)
{
return GUINT16_FROM_LE(((SpiceMiniDataHeader *)header->data)->type);
}
static void full_header_set_msg_type(SpiceDataHeaderOpaque *header, uint16_t type)
{
reinterpret_cast<SpiceDataHeader *>(header->data)->type = GUINT16_TO_LE(type);
}
static void mini_header_set_msg_type(SpiceDataHeaderOpaque *header, uint16_t type)
{
reinterpret_cast<SpiceMiniDataHeader *>(header->data)->type = GUINT16_TO_LE(type);
}
static void full_header_set_msg_size(SpiceDataHeaderOpaque *header, uint32_t size)
{
reinterpret_cast<SpiceDataHeader *>(header->data)->size = GUINT32_TO_LE(size);
}
static void mini_header_set_msg_size(SpiceDataHeaderOpaque *header, uint32_t size)
{
reinterpret_cast<SpiceMiniDataHeader *>(header->data)->size = GUINT32_TO_LE(size);
}
static void full_header_set_msg_serial(SpiceDataHeaderOpaque *header, uint64_t serial)
{
reinterpret_cast<SpiceDataHeader *>(header->data)->serial = GUINT64_TO_LE(serial);
}
static void mini_header_set_msg_serial(SpiceDataHeaderOpaque *header, uint64_t serial)
{
/* ignore serial, not supported by mini header */
}
static void full_header_set_msg_sub_list(SpiceDataHeaderOpaque *header, uint32_t sub_list)
{
(reinterpret_cast<SpiceDataHeader *>(header->data))->sub_list = GUINT32_TO_LE(sub_list);
}
static void mini_header_set_msg_sub_list(SpiceDataHeaderOpaque *header, uint32_t sub_list)
{
spice_error("attempt to set header sub list on mini header");
}
bool RedChannelClient::init()
{
char *local_error = nullptr;
SpiceCoreInterfaceInternal *core;
if (!priv->stream) {
local_error =
g_strdup_printf("Socket not available");
goto cleanup;
}
if (!config_socket()) {
local_error =
g_strdup_printf("Unable to configure socket");
goto cleanup;
}
core = priv->channel->get_core_interface();
red_stream_set_core_interface(priv->stream, core);
priv->stream->watch =
core->watch_new(priv->stream->socket,
SPICE_WATCH_EVENT_READ,
red_channel_client_event,
this);
if (red_stream_get_family(priv->stream) != AF_UNIX) {
priv->latency_monitor.timer =
core->timer_new(ping_timer, this);
if (!priv->client->during_migrate_at_target()) {
priv->start_ping_timer(PING_TEST_IDLE_NET_TIMEOUT_MS);
}
priv->latency_monitor.roundtrip = -1;
priv->latency_monitor.timeout =
priv->monitor_latency ? PING_TEST_TIMEOUT_MS : PING_TEST_LONG_TIMEOUT_MS;
}
priv->channel->add_client(this);
if (!priv->client->add_channel(this, &local_error)) {
priv->channel->remove_client(this);
}
cleanup:
if (local_error) {
red_channel_warning(get_channel(),
"Failed to create channel client: %s",
local_error);
g_free(local_error);
}
return local_error == nullptr;
}
void RedChannelClientPrivate::watch_update_mask(int event_mask)
{
if (!stream->watch) {
return;
}
if (block_read) {
event_mask &= ~SPICE_WATCH_EVENT_READ;
}
red_watch_update_mask(stream->watch, event_mask);
}
void RedChannelClient::block_read()
{
if (priv->block_read) {
return;
}
priv->block_read = true;
priv->watch_update_mask(SPICE_WATCH_EVENT_WRITE);
}
void RedChannelClient::unblock_read()
{
if (!priv->block_read) {
return;
}
priv->block_read = false;
priv->watch_update_mask(SPICE_WATCH_EVENT_READ|SPICE_WATCH_EVENT_WRITE);
}
void RedChannelClientPrivate::seamless_migration_done()
{
wait_migrate_data = FALSE;
if (client->seamless_migration_done_for_channel()) {
start_ping_timer(PING_TEST_IDLE_NET_TIMEOUT_MS);
if (connectivity_monitor.timer) {
red_timer_start(connectivity_monitor.timer,
connectivity_monitor.timeout);
}
}
}
void RedChannelClient::semi_seamless_migration_complete()
{
priv->start_ping_timer(PING_TEST_IDLE_NET_TIMEOUT_MS);
}
bool RedChannelClient::is_waiting_for_migrate_data() const
{
return priv->wait_migrate_data;
}
void RedChannelClient::migrate()
{
priv->cancel_ping_timer();
red_timer_remove(priv->latency_monitor.timer);
priv->latency_monitor.timer = nullptr;
red_timer_remove(priv->connectivity_monitor.timer);
priv->connectivity_monitor.timer = nullptr;
pipe_add_type(RED_PIPE_ITEM_TYPE_MIGRATE);
}
void RedChannelClient::shutdown()
{
if (priv->stream && priv->stream->watch) {
red_watch_remove(priv->stream->watch);
priv->stream->watch = nullptr;
::shutdown(priv->stream->socket, SHUT_RDWR);
}
}
void RedChannelClient::handle_outgoing()
{
RedStream *stream = priv->stream;
OutgoingMessageBuffer *buffer = &priv->outgoing;
ssize_t n;
if (!stream) {
return;
}
if (buffer->size == 0) {
buffer->size = priv->get_out_msg_size();
if (!buffer->size) { // nothing to be sent
return;
}
}
for (;;) {
struct iovec vec[IOV_MAX];
int vec_size =
priv->prepare_out_msg(vec, G_N_ELEMENTS(vec), buffer->pos);
n = red_stream_writev(stream, vec, vec_size);
if (n == -1) {
switch (errno) {
case EAGAIN:
priv->set_blocked();
break;
case EINTR:
continue;
case EPIPE:
disconnect();
break;
default:
red_channel_warning(get_channel(), "%s", strerror(errno));
disconnect();
break;
}
return;
}
buffer->pos += n;
priv->data_sent(n);
if (buffer->pos == buffer->size) { // finished writing data
/* reset buffer before calling on_msg_done, since it
* can trigger another call to RedChannelClient::handle_outgoing (when
* switching from the urgent marshaller to the main one */
buffer->pos = 0;
buffer->size = 0;
msg_sent();
return;
}
}
}
/* return the number of bytes read. -1 in case of error */
static int red_peer_receive(RedStream *stream, uint8_t *buf, uint32_t size)
{
uint8_t *pos = buf;
while (size) {
int now;
/* if we don't have a watch it means socket has been shutdown
* shutdown read doesn't work as accepted - receive may return data afterward.
* check the flag before calling receive
*/
if (!stream->watch) {
return -1;
}
now = red_stream_read(stream, pos, size);
if (now <= 0) {
if (now == 0) {
return -1;
}
spice_assert(now == -1);
if (errno == EAGAIN) {
break;
}
if (errno == EINTR) {
continue;
}
if (errno != EPIPE) {
g_warning("%s", strerror(errno));
}
return -1;
}
size -= now;
pos += now;
}
return pos - buf;
}
// TODO: this implementation, as opposed to the old implementation in red_worker,
// does many calls to red_peer_receive and through it cb_read, and thus avoids pointer
// arithmetic for the case where a single cb_read could return multiple messages. But
// this is suboptimal potentially. Profile and consider fixing.
void RedChannelClient::handle_incoming()
{
RedStream *stream = priv->stream;
IncomingMessageBuffer *buffer = &priv->incoming;
int bytes_read;
uint16_t msg_type;
uint32_t msg_size;
/* XXX: This needs further investigation as to the underlying cause, it happened
* after spicec disconnect (but not with spice-gtk) repeatedly. */
if (!stream) {
return;
}
for (;;) {
int ret_handle;
uint8_t *parsed;
size_t parsed_size;
message_destructor_t parsed_free = nullptr;
RedChannel *channel = get_channel();
if (buffer->header_pos < buffer->header.header_size) {
bytes_read = red_peer_receive(stream,
buffer->header.data + buffer->header_pos,
buffer->header.header_size - buffer->header_pos);
if (bytes_read == -1) {
disconnect();
return;
}
priv->data_read(bytes_read);
buffer->header_pos += bytes_read;
if (buffer->header_pos != buffer->header.header_size) {
return;
}
}
msg_size = buffer->header.get_msg_size(&buffer->header);
msg_type = buffer->header.get_msg_type(&buffer->header);
if (buffer->msg_pos < msg_size) {
if (!buffer->msg) {
buffer->msg = alloc_recv_buf(msg_type, msg_size);
if (buffer->msg == nullptr && priv->block_read) {
// if we are blocked by flow control just return, message will be read
// when data will be available
return;
}
if (buffer->msg == nullptr) {
red_channel_warning(channel, "ERROR: channel refused to allocate buffer.");
disconnect();
return;
}
}
bytes_read = red_peer_receive(stream,
buffer->msg + buffer->msg_pos,
msg_size - buffer->msg_pos);
if (bytes_read == -1) {
release_recv_buf(msg_type, msg_size, buffer->msg);
buffer->msg = nullptr;
disconnect();
return;
}
priv->data_read(bytes_read);
buffer->msg_pos += bytes_read;
if (buffer->msg_pos != msg_size) {
return;
}
}
parsed = get_channel()->parse(buffer->msg, msg_size,
msg_type, &parsed_size, &parsed_free);
if (parsed == nullptr) {
red_channel_warning(channel, "failed to parse message type %d", msg_type);
release_recv_buf(msg_type, msg_size, buffer->msg);
buffer->msg = nullptr;
disconnect();
return;
}
ret_handle = handle_message(msg_type, parsed_size, parsed);
if (parsed_free != nullptr) {
parsed_free(parsed);
}
buffer->msg_pos = 0;
release_recv_buf(msg_type, msg_size, buffer->msg);
buffer->msg = nullptr;
buffer->header_pos = 0;
if (!ret_handle) {
disconnect();
return;
}
}
}
void RedChannelClient::receive()
{
red::shared_ptr<RedChannelClient> hold_rcc(this);
handle_incoming();
}
void RedChannelClient::send()
{
red::shared_ptr<RedChannelClient> hold_rcc(this);
handle_outgoing();
}
inline RedPipeItemPtr RedChannelClientPrivate::pipe_item_get()
{
RedPipeItemPtr ret;
if (send_data.blocked || waiting_for_ack() || pipe.empty()) {
return ret;
}
ret = std::move(pipe.back());
pipe.pop_back();
return ret;
}
void RedChannelClient::push()
{
if (priv->during_send) {
return;
}
priv->during_send = TRUE;
red::shared_ptr<RedChannelClient> hold_rcc(this);
if (is_blocked()) {
send();
}
if (!no_item_being_sent() && !is_blocked()) {
priv->set_blocked();
red_channel_warning(get_channel(),
"ERROR: an item waiting to be sent and not blocked");
}
while (auto pipe_item = priv->pipe_item_get()) {
send_any_item(pipe_item.get());
}
/* prepare_pipe_add() will reenable WRITE events when the priv->pipe is empty
* ack_zero_messages_window() will reenable WRITE events
* if we were waiting for acks to be received
* If we don't remove WRITE if we are waiting for ack we will be keep
* notified that we can write and we then exit (see pipe_item_get) as we
* are waiting for the ack consuming CPU in a tight loop
*/
if ((no_item_being_sent() && priv->pipe.empty()) ||
priv->waiting_for_ack()) {
priv->watch_update_mask(SPICE_WATCH_EVENT_READ);
/* channel has no pending data to send so now we can flush data in
* order to avoid data stall into buffers in case of manual
* flushing
* We need to flush also in case of ack as it is possible
* that for a long train of small messages the message that would
* cause the client to send the ack is still in the queue
*/
red_stream_flush(priv->stream);
}
priv->during_send = FALSE;
}
int RedChannelClient::get_roundtrip_ms() const
{
if (priv->latency_monitor.roundtrip < 0) {
return priv->latency_monitor.roundtrip;
}
return priv->latency_monitor.roundtrip / NSEC_PER_MILLISEC;
}
void RedChannelClient::init_outgoing_messages_window()
{
priv->ack_data.messages_window = 0;
push();
}
void RedChannelClientPrivate::handle_pong(SpiceMsgPing *ping)
{
uint64_t now;
/* ignoring unexpected pongs, or post-migration pongs for pings that
* started just before migration */
if (ping->id != latency_monitor.id) {
spice_warning("ping-id (%u)!= pong-id %u",
latency_monitor.id, ping->id);
return;
}
now = spice_get_monotonic_time_ns();
if (latency_monitor.state == PING_STATE_WARMUP) {
latency_monitor.state = PING_STATE_LATENCY;
return;
}
if (latency_monitor.state != PING_STATE_LATENCY) {
spice_warning("unexpected");
return;
}
/* set TCP_NODELAY=0, in case we reverted it for the test*/
if (!latency_monitor.tcp_nodelay) {
red_stream_set_no_delay(stream, FALSE);
}
/*
* The real network latency shouldn't change during the connection. However,
* the measurements can be bigger than the real roundtrip due to other
* threads or processes that are utilizing the network. We update the roundtrip
* measurement with the minimal value we encountered till now.
*/
if (latency_monitor.roundtrip < 0 ||
now - ping->timestamp < latency_monitor.roundtrip) {
latency_monitor.roundtrip = now - ping->timestamp;
spice_debug("update roundtrip %.2f(ms)", ((double)latency_monitor.roundtrip)/NSEC_PER_MILLISEC);
}
latency_monitor.last_pong_time = now;
latency_monitor.state = PING_STATE_NONE;
start_ping_timer(latency_monitor.timeout);
}
void RedChannelClient::handle_migrate_flush_mark()
{
}
// TODO: the whole migration is broken with multiple clients. What do we want to do?
// basically just
// 1) source send mark to all
// 2) source gets at various times the data (waits for all)
// 3) source migrates to target
// 4) target sends data to all
// So need to make all the handlers work with per channel/client data (what data exactly?)
void RedChannelClient::handle_migrate_data_early(uint32_t size, void *message)
{
red_channel_debug(priv->channel, "rcc %p size %u", this, size);
uint32_t flags = priv->channel->migration_flags();
if (!(flags & SPICE_MIGRATE_NEED_DATA_TRANSFER)) {
return;
}
if (!is_waiting_for_migrate_data()) {
spice_channel_client_error(this, "unexpected");
return;
}
uint64_t serial;
if (handle_migrate_data_get_serial(size, message, serial)) {
priv->set_message_serial(serial);
}
if (!handle_migrate_data(size, message)) {
spice_channel_client_error(this, "handle_migrate_data failed");
return;
}
priv->seamless_migration_done();
}
bool RedChannelClient::handle_message(uint16_t type, uint32_t size, void *message)
{
switch (type) {
case SPICE_MSGC_ACK_SYNC:
priv->ack_data.client_generation = static_cast<SpiceMsgcAckSync *>(message)->generation;
break;
case SPICE_MSGC_ACK:
if (priv->ack_data.client_generation == priv->ack_data.generation) {
priv->ack_data.messages_window -= priv->ack_data.client_window;
priv->watch_update_mask(SPICE_WATCH_EVENT_READ|SPICE_WATCH_EVENT_WRITE);
push();
}
break;
case SPICE_MSGC_DISCONNECTING:
break;
case SPICE_MSGC_MIGRATE_FLUSH_MARK:
if (!priv->wait_migrate_flush_mark) {
spice_error("unexpected flush mark");
return FALSE;
}
handle_migrate_flush_mark();
priv->wait_migrate_flush_mark = FALSE;
break;
case SPICE_MSGC_MIGRATE_DATA:
handle_migrate_data_early(size, message);
break;
case SPICE_MSGC_PONG:
priv->handle_pong(static_cast<SpiceMsgPing *>(message));
break;
default:
red_channel_warning(get_channel(), "invalid message type %u",
type);
return FALSE;
}
return TRUE;
}
void RedChannelClient::init_send_data(uint16_t msg_type)
{
spice_assert(no_item_being_sent());
spice_assert(msg_type != 0);
priv->send_data.header.set_msg_type(&priv->send_data.header, msg_type);
}
void RedChannelClient::begin_send_message()
{
SpiceMarshaller *m = priv->send_data.marshaller;
// TODO - better check: type in channel_allowed_types. Better: type in channel_allowed_types(channel_state)
if (priv->send_data.header.get_msg_type(&priv->send_data.header) == 0) {
red_channel_warning(get_channel(), "BUG: header->type == 0");
return;
}
stat_inc_counter(priv->out_messages, 1);
/* canceling the latency test timer till the nework is idle */
priv->cancel_ping_timer();
spice_marshaller_flush(m);
priv->send_data.size = spice_marshaller_get_total_size(m);
priv->send_data.header.set_msg_size(&priv->send_data.header,
priv->send_data.size -
priv->send_data.header.header_size);
priv->send_data.header.set_msg_serial(&priv->send_data.header,
++priv->send_data.last_sent_serial);
priv->ack_data.messages_window++;
priv->send_data.header.data = nullptr; /* avoid writing to this until we have a new message */
send();
}
SpiceMarshaller *RedChannelClient::switch_to_urgent_sender()
{
spice_assert(no_item_being_sent());
spice_assert(priv->send_data.header.data != nullptr);
priv->send_data.main.header_data = priv->send_data.header.data;
priv->send_data.marshaller = priv->send_data.urgent.marshaller;
priv->reset_send_data();
return priv->send_data.marshaller;
}
uint64_t RedChannelClient::get_message_serial() const
{
return priv->send_data.last_sent_serial + 1;
}
inline void RedChannelClientPrivate::set_message_serial(uint64_t serial)
{
send_data.last_sent_serial = serial - 1;
}
inline bool RedChannelClient::prepare_pipe_add(RedPipeItem *item)
{
spice_assert(item);
if (SPICE_UNLIKELY(!is_connected())) {
spice_debug("rcc is disconnected %p", this);
return false;
}
if (priv->pipe.empty()) {
priv->watch_update_mask(SPICE_WATCH_EVENT_READ | SPICE_WATCH_EVENT_WRITE);
}
return true;
}
void RedChannelClient::pipe_add(RedPipeItemPtr&& item)
{
if (!prepare_pipe_add(item.get())) {
return;
}
priv->pipe.push_front(std::move(item));
}
void RedChannelClient::pipe_add_push(RedPipeItemPtr&& item)
{
pipe_add(std::move(item));
push();
}
void RedChannelClient::pipe_add_after_pos(RedPipeItemPtr&& item,
Pipe::iterator pipe_item_pos)
{
spice_assert(pipe_item_pos != priv->pipe.end());
if (!prepare_pipe_add(item.get())) {
return;
}
++pipe_item_pos;
priv->pipe.insert(pipe_item_pos, std::move(item));
}
void
RedChannelClient::pipe_add_before_pos(RedPipeItemPtr&& item, Pipe::iterator pipe_item_pos)
{
spice_assert(pipe_item_pos != priv->pipe.end());
if (!prepare_pipe_add(item.get())) {
return;
}
priv->pipe.insert(pipe_item_pos, std::move(item));
}
void RedChannelClient::pipe_add_after(RedPipeItemPtr&& item, RedPipeItem *pos)
{
spice_assert(pos);
auto prev = find_pipe_item(priv->pipe, pos);
g_return_if_fail(prev != priv->pipe.end());
pipe_add_after_pos(std::move(item), prev);
}
bool RedChannelClient::pipe_item_is_linked(RedPipeItem *item) const
{
return find_pipe_item(priv->pipe, item) != priv->pipe.end();
}
void RedChannelClient::pipe_add_tail(RedPipeItemPtr&& item)
{
if (!prepare_pipe_add(item.get())) {
return;
}
priv->pipe.push_back(std::move(item));
}
void RedChannelClient::pipe_add_type(int pipe_item_type)
{
auto item = red::make_shared<RedPipeItem>(pipe_item_type);
pipe_add(std::move(item));
}
RedPipeItemPtr RedChannelClient::new_empty_msg(int msg_type)
{
auto item = red::make_shared<RedEmptyMsgPipeItem>();
item->msg = msg_type;
return item;
}
void RedChannelClient::pipe_add_empty_msg(int msg_type)
{
pipe_add(new_empty_msg(msg_type));
}
bool RedChannelClient::pipe_is_empty() const
{
return priv->pipe.empty();
}
uint32_t RedChannelClient::get_pipe_size() const
{
return priv->pipe.size();
}
RedChannelClient::Pipe& RedChannelClient::get_pipe()
{
return priv->pipe;
}
bool RedChannelClient::is_mini_header() const
{
return priv->is_mini_header;
}
bool RedChannelClient::is_connected() const
{
return g_list_find(priv->channel->get_clients(), this) != nullptr;
}
void RedChannelClientPrivate::clear_sent_item()
{
send_data.blocked = FALSE;
send_data.size = 0;
spice_marshaller_reset(send_data.marshaller);
}
// TODO: again - what is the context exactly? this happens in channel disconnect. but our
// current red_channel_shutdown also closes the socket - is there a socket to close?
// are we reading from an fd here? arghh
void RedChannelClientPrivate::pipe_clear()
{
clear_sent_item();
pipe.clear();
}
void RedChannelClient::ack_zero_messages_window()
{
priv->watch_update_mask(SPICE_WATCH_EVENT_READ|SPICE_WATCH_EVENT_WRITE);
priv->ack_data.messages_window = 0;
}
void RedChannelClient::ack_set_client_window(int client_window)
{
priv->ack_data.client_window = client_window;
}
void RedChannelClient::push_set_ack()
{
pipe_add_type(RED_PIPE_ITEM_TYPE_SET_ACK);
}
void RedChannelClient::disconnect()
{
auto channel = priv->channel;
if (!is_connected()) {
return;
}
priv->pipe_clear();
shutdown();
red_timer_remove(priv->latency_monitor.timer);
priv->latency_monitor.timer = nullptr;
red_timer_remove(priv->connectivity_monitor.timer);
priv->connectivity_monitor.timer = nullptr;
channel->remove_client(this);
on_disconnect();
// remove client from RedClient
// NOTE this may trigger the free of the object, if we are in a watch/timer
// we should make sure we keep a reference
get_client()->remove_channel(this);
}
bool RedChannelClient::is_blocked() const
{
return priv->send_data.blocked;
}
int RedChannelClient::send_message_pending()
{
return priv->send_data.header.get_msg_type(&priv->send_data.header) != 0;
}
SpiceMarshaller *RedChannelClient::get_marshaller()
{
return priv->send_data.marshaller;
}
RedStream *RedChannelClient::get_stream()
{
return priv->stream;
}
RedClient *RedChannelClient::get_client()
{
return priv->client;
}
void RedChannelClient::set_header_sub_list(uint32_t sub_list)
{
priv->send_data.header.set_msg_sub_list(&priv->send_data.header, sub_list);
}
/* TODO: more evil sync stuff. anything with the word wait in it's name. */
bool RedChannelClient::wait_pipe_item_sent(Pipe::iterator item_pos, int64_t timeout)
{
uint64_t end_time;
spice_debug("trace");
if (timeout != -1) {
end_time = spice_get_monotonic_time_ns() + timeout;
} else {
end_time = UINT64_MAX;
}
auto mark_item = red::make_shared<MarkerPipeItem>();
mark_item->item_sent = false;
pipe_add_before_pos(RedPipeItemPtr(mark_item), item_pos);
for (;;) {
receive();
push();
if (mark_item->item_sent ||
(timeout != -1 && spice_get_monotonic_time_ns() >= end_time)) {
break;
}
usleep(CHANNEL_BLOCKED_SLEEP_DURATION);
}
if (!mark_item->item_sent) {
// still on the queue
spice_warning("timeout");
}
return mark_item->item_sent;
}
bool RedChannelClient::wait_outgoing_item(int64_t timeout)
{
uint64_t end_time;
int blocked;
if (!is_blocked()) {
return TRUE;
}
if (timeout != -1) {
end_time = spice_get_monotonic_time_ns() + timeout;
} else {
end_time = UINT64_MAX;
}
spice_debug("blocked");
do {
usleep(CHANNEL_BLOCKED_SLEEP_DURATION);
receive();
send();
} while ((blocked = is_blocked()) &&
(timeout == -1 || spice_get_monotonic_time_ns() < end_time));
if (blocked) {
spice_warning("timeout");
return FALSE;
}
spice_assert(no_item_being_sent());
return TRUE;
}
bool RedChannelClient::no_item_being_sent() const
{
return priv->send_data.size == 0;
}
void RedChannelClient::pipe_remove_and_release(RedPipeItem *item)
{
priv->pipe_remove(item);
}
/* client mutex should be locked before this call */
bool RedChannelClient::set_migration_seamless()
{
bool ret = false;
uint32_t flags;
flags = priv->channel->migration_flags();
if (flags & SPICE_MIGRATE_NEED_DATA_TRANSFER) {
priv->wait_migrate_data = TRUE;
ret = true;
}
red_channel_debug(priv->channel, "rcc %p wait data %d", this,
priv->wait_migrate_data);
return ret;
}
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