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[Qemu-devel] [PULL 09/32] vhost-net: save & restore vring enable state
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 09/32] vhost-net: save & restore vring enable state |
Date: |
Mon, 13 Jun 2016 23:39:23 +0300 |
From: Marc-André Lureau <address@hidden>
A driver may change the vring enable state at run time but vhost-user
backend may not be present (a contrived example is when the backend is
disconnected and the device is reconfigured after driver rebinding)
Restore the vring state when the vhost-user backend is started, so it
can process the ring.
Signed-off-by: Marc-André Lureau <address@hidden>
Tested-by: Yuanhan Liu <address@hidden>
Reviewed-by: Yuanhan Liu <address@hidden>
Reviewed-by: Victor Kaplansky <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
include/net/net.h | 1 +
hw/net/vhost_net.c | 11 +++++++++++
2 files changed, 12 insertions(+)
diff --git a/include/net/net.h b/include/net/net.h
index a69e382..a5c5095 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -99,6 +99,7 @@ struct NetClientState {
NetClientDestructor *destructor;
unsigned int queue_index;
unsigned rxfilter_notify_enabled:1;
+ int vring_enable;
QTAILQ_HEAD(NetFilterHead, NetFilterState) filters;
};
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index b28881f..50f4dcd 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -329,6 +329,15 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
if (r < 0) {
goto err_start;
}
+
+ if (ncs[i].peer->vring_enable) {
+ /* restore vring enable state */
+ r = vhost_set_vring_enable(ncs[i].peer, ncs[i].peer->vring_enable);
+
+ if (r < 0) {
+ goto err_start;
+ }
+ }
}
return 0;
@@ -422,6 +431,8 @@ int vhost_set_vring_enable(NetClientState *nc, int enable)
VHostNetState *net = get_vhost_net(nc);
const VhostOps *vhost_ops;
+ nc->vring_enable = enable;
+
if (!net) {
return 0;
}
--
MST
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