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From e5834364958a3914d7b8b46b985a1b054728b466 Mon Sep 17 00:00:00 2001
From: Laurent Vivier <lvivier@redhat.com>
Date: Thu, 19 Jan 2023 11:16:45 +0100
Subject: [PATCH 2/8] net: stream: add a new option to automatically reconnect
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Laurent Vivier <lvivier@redhat.com>
RH-MergeRequest: 148: net: stream: add a new option to automatically reconnect
RH-Bugzilla: 2169232
RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Acked-by: MST <mst@redhat.com>
RH-Acked-by: David Gibson (Red Hat) <dgibson@redhat.com>
RH-Commit: [2/2] 9b87647a9ed2e7c1b91bdfa9d0a736e091c892a5 (lvivier/qemu-kvm-centos)
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>
(cherry picked from commit b95c0d4440950fba6dbef0f781962911fa42abdb)
---
net/stream.c | 53 ++++++++++++++++++-
qapi/net.json | 7 ++-
qemu-options.hx | 6 +--
tests/qtest/netdev-socket.c | 101 ++++++++++++++++++++++++++++++++++++
4 files changed, 162 insertions(+), 5 deletions(-)
diff --git a/net/stream.c b/net/stream.c
index 37ff727e0c..9204b4c96e 100644
--- a/net/stream.c
+++ b/net/stream.c
@@ -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);
}
diff --git a/qapi/net.json b/qapi/net.json
index 522ac582ed..d6eb30008b 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -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:
diff --git a/qemu-options.hx b/qemu-options.hx
index ea02ca3a45..48eef4aa2c 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2766,9 +2766,9 @@ 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"
diff --git a/tests/qtest/netdev-socket.c b/tests/qtest/netdev-socket.c
index 6ba256e173..acc32c378b 100644
--- a/tests/qtest/netdev-socket.c
+++ b/tests/qtest/netdev-socket.c
@@ -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 5
@@ -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);
--
2.31.1
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