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net: stream: add a new option to automatically reconnect

Browse source 
In stream mode, if the server shuts down there is currently
no way to reconnect the client to a new server without removing
the NIC device and the netdev backend (or to reboot).

This patch introduces a reconnect option that specifies a delay
to try to reconnect with the same parameters.

Add a new test in qtest to test the reconnect option and the
connect/disconnect events.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Laurent Vivier 2023-01-19 11:16:45 +01:00 committed by Jason Wang
parent 993f71ee33
commit 148fbf0d58
4 changed files with 162 additions and 5 deletions
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53
net/stream.c
View file

@ -39,6 +39,8 @@
#include "io/channel-socket.h"
#include "io/net-listener.h"
#include "qapi/qapi-events-net.h"
#include "qapi/qapi-visit-sockets.h"
#include "qapi/clone-visitor.h"
typedef struct NetStreamState {
NetClientState nc;
@ -49,11 +51,15 @@ typedef struct NetStreamState {
guint ioc_write_tag;
SocketReadState rs;
unsigned int send_index; /* number of bytes sent*/
uint32_t reconnect;
guint timer_tag;
SocketAddress *addr;
} NetStreamState;
static void net_stream_listen(QIONetListener *listener,
QIOChannelSocket *cioc,
void *opaque);
static void net_stream_arm_reconnect(NetStreamState *s);
static gboolean net_stream_writable(QIOChannel *ioc,
GIOCondition condition,
@ -170,6 +176,7 @@ static gboolean net_stream_send(QIOChannel *ioc,
qemu_set_info_str(&s->nc, "%s", "");
qapi_event_send_netdev_stream_disconnected(s->nc.name);
net_stream_arm_reconnect(s);
return G_SOURCE_REMOVE;
}
@ -187,6 +194,14 @@ static gboolean net_stream_send(QIOChannel *ioc,
static void net_stream_cleanup(NetClientState *nc)
{
NetStreamState *s = DO_UPCAST(NetStreamState, nc, nc);
if (s->timer_tag) {
g_source_remove(s->timer_tag);
s->timer_tag = 0;
}
if (s->addr) {
qapi_free_SocketAddress(s->addr);
s->addr = NULL;
}
if (s->ioc) {
if (QIO_CHANNEL_SOCKET(s->ioc)->fd != -1) {
if (s->ioc_read_tag) {
@ -346,12 +361,37 @@ static void net_stream_client_connected(QIOTask *task, gpointer opaque)
error:
object_unref(OBJECT(s->ioc));
s->ioc = NULL;
net_stream_arm_reconnect(s);
}
static gboolean net_stream_reconnect(gpointer data)
{
NetStreamState *s = data;
QIOChannelSocket *sioc;
s->timer_tag = 0;
sioc = qio_channel_socket_new();
s->ioc = QIO_CHANNEL(sioc);
qio_channel_socket_connect_async(sioc, s->addr,
net_stream_client_connected, s,
NULL, NULL);
return G_SOURCE_REMOVE;
}
static void net_stream_arm_reconnect(NetStreamState *s)
{
if (s->reconnect && s->timer_tag == 0) {
s->timer_tag = g_timeout_add_seconds(s->reconnect,
net_stream_reconnect, s);
}
}
static int net_stream_client_init(NetClientState *peer,
const char *model,
const char *name,
SocketAddress *addr,
uint32_t reconnect,
Error **errp)
{
NetStreamState *s;
@ -364,6 +404,10 @@ static int net_stream_client_init(NetClientState *peer,
s->ioc = QIO_CHANNEL(sioc);
s->nc.link_down = true;
s->reconnect = reconnect;
if (reconnect) {
s->addr = QAPI_CLONE(SocketAddress, addr);
}
qio_channel_socket_connect_async(sioc, addr,
net_stream_client_connected, s,
NULL, NULL);
@ -380,7 +424,14 @@ int net_init_stream(const Netdev *netdev, const char *name,
sock = &netdev->u.stream;
if (!sock->has_server || !sock->server) {
return net_stream_client_init(peer, "stream", name, sock->addr, errp);
return net_stream_client_init(peer, "stream", name, sock->addr,
sock->has_reconnect ? sock->reconnect : 0,
errp);
}
if (sock->has_reconnect) {
error_setg(errp, "'reconnect' option is incompatible with "
"socket in server mode");
return -1;
}
return net_stream_server_init(peer, "stream", name, sock->addr, errp);
}

7
qapi/net.json
View file

@ -585,6 +585,10 @@
# @addr: socket address to listen on (server=true)
# or connect to (server=false)
# @server: create server socket (default: false)
# @reconnect: For a client socket, if a socket is disconnected,
# then attempt a reconnect after the given number of seconds.
# Setting this to zero disables this function. (default: 0)
# (since 8.0)
#
# Only SocketAddress types 'unix', 'inet' and 'fd' are supported.
#
@ -593,7 +597,8 @@
{ 'struct': 'NetdevStreamOptions',
'data': {
'addr': 'SocketAddress',
'*server': 'bool' } }
'*server': 'bool',
'*reconnect': 'uint32' } }
##
# @NetdevDgramOptions:

6
qemu-options.hx
View file

@ -2762,9 +2762,9 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
"-netdev socket,id=str[,fd=h][,udp=host:port][,localaddr=host:port]\n"
" configure a network backend to connect to another network\n"
" using an UDP tunnel\n"
"-netdev stream,id=str[,server=on|off],addr.type=inet,addr.host=host,addr.port=port[,to=maxport][,numeric=on|off][,keep-alive=on|off][,mptcp=on|off][,addr.ipv4=on|off][,addr.ipv6=on|off]\n"
"-netdev stream,id=str[,server=on|off],addr.type=unix,addr.path=path[,abstract=on|off][,tight=on|off]\n"
"-netdev stream,id=str[,server=on|off],addr.type=fd,addr.str=file-descriptor\n"
"-netdev stream,id=str[,server=on|off],addr.type=inet,addr.host=host,addr.port=port[,to=maxport][,numeric=on|off][,keep-alive=on|off][,mptcp=on|off][,addr.ipv4=on|off][,addr.ipv6=on|off][,reconnect=seconds]\n"
"-netdev stream,id=str[,server=on|off],addr.type=unix,addr.path=path[,abstract=on|off][,tight=on|off][,reconnect=seconds]\n"
"-netdev stream,id=str[,server=on|off],addr.type=fd,addr.str=file-descriptor[,reconnect=seconds]\n"
" configure a network backend to connect to another network\n"
" using a socket connection in stream mode.\n"
"-netdev dgram,id=str,remote.type=inet,remote.host=maddr,remote.port=port[,local.type=inet,local.host=addr]\n"

101
tests/qtest/netdev-socket.c
View file

@ -11,6 +11,10 @@
#include <glib/gstdio.h>
#include "../unit/socket-helpers.h"
#include "libqtest.h"
#include "qapi/qmp/qstring.h"
#include "qemu/sockets.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/qapi-visit-sockets.h"
#define CONNECTION_TIMEOUT 60
@ -142,6 +146,101 @@ static void test_stream_inet_ipv4(void)
qtest_quit(qts0);
}
static void wait_stream_connected(QTestState *qts, const char *id,
SocketAddress **addr)
{
QDict *resp, *data;
QString *qstr;
QObject *obj;
Visitor *v = NULL;
resp = qtest_qmp_eventwait_ref(qts, "NETDEV_STREAM_CONNECTED");
g_assert_nonnull(resp);
data = qdict_get_qdict(resp, "data");
g_assert_nonnull(data);
qstr = qobject_to(QString, qdict_get(data, "netdev-id"));
g_assert_nonnull(data);
g_assert(!strcmp(qstring_get_str(qstr), id));
obj = qdict_get(data, "addr");
v = qobject_input_visitor_new(obj);
visit_type_SocketAddress(v, NULL, addr, NULL);
visit_free(v);
qobject_unref(resp);
}
static void wait_stream_disconnected(QTestState *qts, const char *id)
{
QDict *resp, *data;
QString *qstr;
resp = qtest_qmp_eventwait_ref(qts, "NETDEV_STREAM_DISCONNECTED");
g_assert_nonnull(resp);
data = qdict_get_qdict(resp, "data");
g_assert_nonnull(data);
qstr = qobject_to(QString, qdict_get(data, "netdev-id"));
g_assert_nonnull(data);
g_assert(!strcmp(qstring_get_str(qstr), id));
qobject_unref(resp);
}
static void test_stream_inet_reconnect(void)
{
QTestState *qts0, *qts1;
int port;
SocketAddress *addr;
port = inet_get_free_port(false);
qts0 = qtest_initf("-nodefaults -M none "
"-netdev stream,id=st0,server=true,addr.type=inet,"
"addr.ipv4=on,addr.ipv6=off,"
"addr.host=127.0.0.1,addr.port=%d", port);
EXPECT_STATE(qts0, "st0: index=0,type=stream,\r\n", 0);
qts1 = qtest_initf("-nodefaults -M none "
"-netdev stream,server=false,id=st0,addr.type=inet,"
"addr.ipv4=on,addr.ipv6=off,reconnect=1,"
"addr.host=127.0.0.1,addr.port=%d", port);
wait_stream_connected(qts0, "st0", &addr);
g_assert_cmpint(addr->type, ==, SOCKET_ADDRESS_TYPE_INET);
g_assert_cmpstr(addr->u.inet.host, ==, "127.0.0.1");
qapi_free_SocketAddress(addr);
/* kill server */
qtest_quit(qts0);
/* check client has been disconnected */
wait_stream_disconnected(qts1, "st0");
/* restart server */
qts0 = qtest_initf("-nodefaults -M none "
"-netdev stream,id=st0,server=true,addr.type=inet,"
"addr.ipv4=on,addr.ipv6=off,"
"addr.host=127.0.0.1,addr.port=%d", port);
/* wait connection events*/
wait_stream_connected(qts0, "st0", &addr);
g_assert_cmpint(addr->type, ==, SOCKET_ADDRESS_TYPE_INET);
g_assert_cmpstr(addr->u.inet.host, ==, "127.0.0.1");
qapi_free_SocketAddress(addr);
wait_stream_connected(qts1, "st0", &addr);
g_assert_cmpint(addr->type, ==, SOCKET_ADDRESS_TYPE_INET);
g_assert_cmpstr(addr->u.inet.host, ==, "127.0.0.1");
g_assert_cmpint(atoi(addr->u.inet.port), ==, port);
qapi_free_SocketAddress(addr);
qtest_quit(qts1);
qtest_quit(qts0);
}
static void test_stream_inet_ipv6(void)
{
QTestState *qts0, *qts1;
@ -418,6 +517,8 @@ int main(int argc, char **argv)
#ifndef _WIN32
qtest_add_func("/netdev/dgram/mcast", test_dgram_mcast);
#endif
qtest_add_func("/netdev/stream/inet/reconnect",
test_stream_inet_reconnect);
}
if (has_ipv6) {
qtest_add_func("/netdev/stream/inet/ipv6", test_stream_inet_ipv6);