Based on patch by Nikolay Nikolaev:
Vhost-user will implement the multi queue support in a similar way
to what vhost already has - a separate thread for each queue.
To enable the multi queue functionality - a new command line parameter
"queues" is introduced for the vhost-user netdev.
The RESET_OWNER change is based on commit:
294ce717e0f212ed0763307f3eab72b4a1bdf4d0
If it is reverted, the patch need update for it accordingly.
Signed-off-by: Nikolay Nikolaev <n.nikol...@virtualopensystems.com>
Signed-off-by: Changchun Ouyang <changchun.ouy...@intel.com>
---
Changes since v5:
- fix the message descption for VHOST_RESET_OWNER in vhost-user txt
Changes since v4:
- remove the unnecessary trailing '\n'
Changes since v3:
- fix one typo and wrap one long line
Changes since v2:
- fix vq index issue for set_vring_call
When it is the case of VHOST_SET_VRING_CALL, The vq_index is not initialized
before it is used,
thus it could be a random value. The random value leads to crash in vhost
after passing down
to vhost, as vhost use this random value to index an array index.
- fix the typo in the doc and description
- address vq index for reset_owner
Changes since v1:
- use s->nc.info_str when bringing up/down the backend
docs/specs/vhost-user.txt | 7 ++++++-
hw/net/vhost_net.c | 3 ++-
hw/virtio/vhost-user.c | 11 ++++++++++-
net/vhost-user.c | 37 ++++++++++++++++++++++++-------------
qapi-schema.json | 6 +++++-
qemu-options.hx | 5 +++--
6 files changed, 50 insertions(+), 19 deletions(-)
diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt
index 70da3b1..9390f89 100644
--- a/docs/specs/vhost-user.txt
+++ b/docs/specs/vhost-user.txt
@@ -135,6 +135,11 @@ As older slaves don't support negotiating protocol
features,
a feature bit was dedicated for this purpose:
#define VHOST_USER_F_PROTOCOL_FEATURES 30
+Multi queue support
+-------------------
+The protocol supports multiple queues by setting all index fields in the sent
+messages to a properly calculated value.
+
Message types
-------------
@@ -198,7 +203,7 @@ Message types
Id: 4
Equivalent ioctl: VHOST_RESET_OWNER
- Master payload: N/A
+ Master payload: vring state description
Issued when a new connection is about to be closed. The Master will no
longer own this connection (and will usually close it).
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 1f25cb3..9cd6c05 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -159,6 +159,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
+ net->dev.vq_index = net->nc->queue_index;
r = vhost_dev_init(&net->dev, options->opaque,
options->backend_type, options->force);
@@ -269,7 +270,7 @@ static void vhost_net_stop_one(struct vhost_net *net,
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
const VhostOps *vhost_ops = net->dev.vhost_ops;
int r = vhost_ops->vhost_call(&net->dev, VHOST_RESET_OWNER,
- NULL);
+ &file);
assert(r >= 0);
}
}
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 27ba035..fb11d4c 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -219,7 +219,12 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned
long int request,
break;
case VHOST_USER_SET_OWNER:
+ break;
+
case VHOST_USER_RESET_OWNER:
+ memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
+ msg.state.index += dev->vq_index;
+ msg.size = sizeof(m.state);
break;
case VHOST_USER_SET_MEM_TABLE:
@@ -262,17 +267,20 @@ static int vhost_user_call(struct vhost_dev *dev,
unsigned long int request,
case VHOST_USER_SET_VRING_NUM:
case VHOST_USER_SET_VRING_BASE:
memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
+ msg.state.index += dev->vq_index;
msg.size = sizeof(m.state);
break;
case VHOST_USER_GET_VRING_BASE:
memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
+ msg.state.index += dev->vq_index;
msg.size = sizeof(m.state);
need_reply = 1;
break;
case VHOST_USER_SET_VRING_ADDR:
memcpy(&msg.addr, arg, sizeof(struct vhost_vring_addr));
+ msg.addr.index += dev->vq_index;
msg.size = sizeof(m.addr);
break;
@@ -280,7 +288,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned
long int request,
case VHOST_USER_SET_VRING_CALL:
case VHOST_USER_SET_VRING_ERR:
file = arg;
- msg.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
+ msg.u64 = (file->index + dev->vq_index) & VHOST_USER_VRING_IDX_MASK;
msg.size = sizeof(m.u64);
if (ioeventfd_enabled() && file->fd > 0) {
fds[fd_num++] = file->fd;
@@ -322,6 +330,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned
long int request,
error_report("Received bad msg size.");
return -1;
}
+ msg.state.index -= dev->vq_index;
memcpy(arg, &msg.state, sizeof(struct vhost_vring_state));
break;
default:
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 1d86a2b..904d8af 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -121,35 +121,39 @@ static void net_vhost_user_event(void *opaque, int event)
case CHR_EVENT_OPENED:
vhost_user_start(s);
net_vhost_link_down(s, false);
- error_report("chardev \"%s\" went up", s->chr->label);
+ error_report("chardev \"%s\" went up", s->nc.info_str);
break;
case CHR_EVENT_CLOSED:
net_vhost_link_down(s, true);
vhost_user_stop(s);
- error_report("chardev \"%s\" went down", s->chr->label);
+ error_report("chardev \"%s\" went down", s->nc.info_str);
break;
}
}
static int net_vhost_user_init(NetClientState *peer, const char *device,
- const char *name, CharDriverState *chr)
+ const char *name, CharDriverState *chr,
+ uint32_t queues)
{
NetClientState *nc;
VhostUserState *s;
+ int i;
- nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
+ for (i = 0; i < queues; i++) {
+ nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
- snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user to %s",
- chr->label);
+ snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
+ i, chr->label);
- s = DO_UPCAST(VhostUserState, nc, nc);
+ s = DO_UPCAST(VhostUserState, nc, nc);
- /* We don't provide a receive callback */
- s->nc.receive_disabled = 1;
- s->chr = chr;
-
- qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
+ /* We don't provide a receive callback */
+ s->nc.receive_disabled = 1;
+ s->chr = chr;
+ s->nc.queue_index = i;
+ qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
+ }
return 0;
}
@@ -225,6 +229,7 @@ static int net_vhost_check_net(QemuOpts *opts, void *opaque)
int net_init_vhost_user(const NetClientOptions *opts, const char *name,
NetClientState *peer)
{
+ uint32_t queues;
const NetdevVhostUserOptions *vhost_user_opts;
CharDriverState *chr;
@@ -243,6 +248,12 @@ int net_init_vhost_user(const NetClientOptions *opts,
const char *name,
return -1;
}
+ /* number of queues for multiqueue */
+ if (vhost_user_opts->has_queues) {
+ queues = vhost_user_opts->queues;
+ } else {
+ queues = 1;
+ }
- return net_vhost_user_init(peer, "vhost_user", name, chr);
+ return net_vhost_user_init(peer, "vhost_user", name, chr, queues);
}
diff --git a/qapi-schema.json b/qapi-schema.json
index f97ffa1..51e40ce 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2444,12 +2444,16 @@
#
# @vhostforce: #optional vhost on for non-MSIX virtio guests (default: false).
#
+# @queues: #optional number of queues to be created for multiqueue vhost-user
+# (default: 1) (Since 2.5)
+#
# Since 2.1
##
{ 'struct': 'NetdevVhostUserOptions',
'data': {
'chardev': 'str',
- '*vhostforce': 'bool' } }
+ '*vhostforce': 'bool',
+ '*queues': 'uint32' } }
##
# @NetClientOptions
diff --git a/qemu-options.hx b/qemu-options.hx
index ec356f6..dad035e 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1942,13 +1942,14 @@ The hubport netdev lets you connect a NIC to a QEMU
"vlan" instead of a single
netdev. @code{-net} and @code{-device} with parameter @option{vlan} create the
required hub automatically.
-@item -netdev vhost-user,chardev=@var{id}[,vhostforce=on|off]
+@item -netdev vhost-user,chardev=@var{id}[,vhostforce=on|off][,queues=n]
Establish a vhost-user netdev, backed by a chardev @var{id}. The chardev should
be a unix domain socket backed one. The vhost-user uses a specifically defined
protocol to pass vhost ioctl replacement messages to an application on the
other
end of the socket. On non-MSIX guests, the feature can be forced with
-@var{vhostforce}.
+@var{vhostforce}. Use 'queues=@var{n}' to specify the number of queues to
+be created for multiqueue vhost-user.
Example:
@example
--
1.8.4.2
