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[Qemu-devel] [PATCH v5 7/7] Add vhost-user reconnection
From: |
Antonios Motakis |
Subject: |
[Qemu-devel] [PATCH v5 7/7] Add vhost-user reconnection |
Date: |
Thu, 9 Jan 2014 16:00:01 +0100 |
At runtime vhost-user netdev will detect if the vhost backend is up or down.
Upon disconnection it will set link_down accordingly and notify virtio-net.
Signed-off-by: Antonios Motakis <address@hidden>
Signed-off-by: Nikolay Nikolaev <address@hidden>
---
hw/net/vhost_net.c | 16 +++++++++++
hw/virtio/vhost-backend.c | 16 +++++++++++
include/hw/virtio/vhost-backend.h | 2 ++
include/net/vhost_net.h | 1 +
net/vhost-user.c | 56 +++++++++++++++++++++++++++++++++++++++
5 files changed, 91 insertions(+)
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index e42f4d6..56c218e 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -304,6 +304,17 @@ void vhost_net_virtqueue_mask(VHostNetState *net,
VirtIODevice *dev,
vhost_virtqueue_mask(&net->dev, dev, idx, mask);
}
+int vhost_net_link_status(VHostNetState *net)
+{
+ int r = 0;
+
+ if (net->dev.vhost_ops->vhost_status) {
+ r = net->dev.vhost_ops->vhost_status(&net->dev);
+ }
+
+ return r;
+}
+
VHostNetState *get_vhost_net(NetClientState *nc)
{
VHostNetState *vhost_net = 0;
@@ -372,6 +383,11 @@ void vhost_net_virtqueue_mask(VHostNetState *net,
VirtIODevice *dev,
{
}
+int vhost_net_link_status(VHostNetState *net)
+{
+ return 0;
+}
+
VHostNetState *get_vhost_net(NetClientState *nc)
{
return 0;
diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
index 50ea307..fcd274f 100644
--- a/hw/virtio/vhost-backend.c
+++ b/hw/virtio/vhost-backend.c
@@ -350,9 +350,23 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned
long int request,
}
}
+ /* mark the backend non operational */
+ if (result < 0) {
+ error_report("%s: Connection break detected\n", __func__);
+ vhost_user_cleanup(dev);
+ return 0;
+ }
+
return result;
}
+static int vhost_user_status(struct vhost_dev *dev)
+{
+ vhost_user_echo(dev);
+
+ return (dev->control >= 0);
+}
+
static int vhost_user_init(struct vhost_dev *dev, const char *devpath)
{
int fd = -1;
@@ -432,6 +446,7 @@ static int vhost_user_cleanup(struct vhost_dev *dev)
static const VhostOps user_ops = {
.backend_type = VHOST_BACKEND_TYPE_USER,
.vhost_call = vhost_user_call,
+ .vhost_status = vhost_user_status,
.vhost_backend_init = vhost_user_init,
.vhost_backend_cleanup = vhost_user_cleanup
};
@@ -464,6 +479,7 @@ static int vhost_kernel_cleanup(struct vhost_dev *dev)
static const VhostOps kernel_ops = {
.backend_type = VHOST_BACKEND_TYPE_KERNEL,
.vhost_call = vhost_kernel_call,
+ .vhost_status = 0,
.vhost_backend_init = vhost_kernel_init,
.vhost_backend_cleanup = vhost_kernel_cleanup
};
diff --git a/include/hw/virtio/vhost-backend.h
b/include/hw/virtio/vhost-backend.h
index ef87ffa..f2b4a6c 100644
--- a/include/hw/virtio/vhost-backend.h
+++ b/include/hw/virtio/vhost-backend.h
@@ -22,12 +22,14 @@ struct vhost_dev;
typedef int (*vhost_call)(struct vhost_dev *dev, unsigned long int request,
void *arg);
+typedef int (*vhost_status)(struct vhost_dev *dev);
typedef int (*vhost_backend_init)(struct vhost_dev *dev, const char *devpath);
typedef int (*vhost_backend_cleanup)(struct vhost_dev *dev);
typedef struct VhostOps {
VhostBackendType backend_type;
vhost_call vhost_call;
+ vhost_status vhost_status;
vhost_backend_init vhost_backend_init;
vhost_backend_cleanup vhost_backend_cleanup;
} VhostOps;
diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
index abd3d0b..6390907 100644
--- a/include/net/vhost_net.h
+++ b/include/net/vhost_net.h
@@ -31,5 +31,6 @@ void vhost_net_ack_features(VHostNetState *net, unsigned
features);
bool vhost_net_virtqueue_pending(VHostNetState *net, int n);
void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
int idx, bool mask);
+int vhost_net_link_status(VHostNetState *net);
VHostNetState *get_vhost_net(NetClientState *nc);
#endif
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 6fd5afc..56f7dd4 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -12,6 +12,7 @@
#include "net/vhost_net.h"
#include "net/vhost-user.h"
#include "qemu/error-report.h"
+#include "qemu/timer.h"
typedef struct VhostUserState {
NetClientState nc;
@@ -19,6 +20,9 @@ typedef struct VhostUserState {
char *devpath;
} VhostUserState;
+static QEMUTimer *vhost_user_timer;
+#define VHOST_USER_TIMEOUT (1*1000)
+
VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
{
VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
@@ -31,6 +35,11 @@ static int vhost_user_running(VhostUserState *s)
return (s->vhost_net) ? 1 : 0;
}
+static int vhost_user_link_status(VhostUserState *s)
+{
+ return (!s->nc.link_down) && vhost_net_link_status(s->vhost_net);
+}
+
static int vhost_user_start(VhostUserState *s)
{
VhostNetOptions options;
@@ -59,6 +68,48 @@ static void vhost_user_stop(VhostUserState *s)
s->vhost_net = 0;
}
+static void vhost_user_timer_handler(void *opaque)
+{
+ VhostUserState *s = opaque;
+ int link_down = 0;
+
+ if (vhost_user_running(s)) {
+ if (!vhost_user_link_status(s)) {
+ link_down = 1;
+ }
+ } else {
+ vhost_user_start(s);
+ if (!vhost_user_running(s)) {
+ link_down = 1;
+ }
+ }
+
+ if (link_down != s->nc.link_down) {
+
+ s->nc.link_down = link_down;
+
+ if (s->nc.peer) {
+ s->nc.peer->link_down = link_down;
+ }
+
+ if (s->nc.info->link_status_changed) {
+ s->nc.info->link_status_changed(&s->nc);
+ }
+
+ if (s->nc.peer && s->nc.peer->info->link_status_changed) {
+ s->nc.peer->info->link_status_changed(s->nc.peer);
+ }
+
+ if (link_down) {
+ vhost_user_stop(s);
+ }
+ }
+
+ /* reschedule */
+ timer_mod(vhost_user_timer,
+ qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + VHOST_USER_TIMEOUT);
+}
+
static void vhost_user_cleanup(NetClientState *nc)
{
VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
@@ -93,6 +144,11 @@ static int net_vhost_user_init(NetClientState *peer, const
char *device,
r = vhost_user_start(s);
+ vhost_user_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
+ vhost_user_timer_handler, s);
+ timer_mod(vhost_user_timer,
+ qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + VHOST_USER_TIMEOUT);
+
return r;
}
--
1.8.3.2