[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH] vhost-user: multiqueue support
From: |
Nikolay Nikolaev |
Subject: |
[Qemu-devel] [PATCH] vhost-user: multiqueue support |
Date: |
Sat, 06 Dec 2014 18:52:56 +0200 |
User-agent: |
StGit/0.17.1-dirty |
Vhost-user will implement the multiqueueu support in a similar way to what
vhost already has - a separate thread for each queue.
To enable multiquue funcionality - a new command line parameter
"queues" is introduced for the vhost-user netdev.
Signed-off-by: Nikolay Nikolaev <address@hidden>
---
docs/specs/vhost-user.txt | 7 +++++++
hw/virtio/vhost-user.c | 6 +++++-
net/vhost-user.c | 35 +++++++++++++++++++++++------------
qapi-schema.json | 5 ++++-
qemu-options.hx | 5 +++--
5 files changed, 42 insertions(+), 16 deletions(-)
diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt
index 650bb18..d3857f5 100644
--- a/docs/specs/vhost-user.txt
+++ b/docs/specs/vhost-user.txt
@@ -127,6 +127,13 @@ in the ancillary data:
If Master is unable to send the full message or receives a wrong reply it will
close the connection. An optional reconnection mechanism can be implemented.
+Multi queue suport
+---------------------
+The protocol supports multiple queues by setting all index fields in the sent
+messages to a value calculated by the following formula:
+<queue idx> + <vring idx>
+The <queue idx> is increased by 2.
+
Message types
-------------
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index aefe0bb..83ebcaa 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -253,17 +253,20 @@ static int vhost_user_call(struct vhost_dev *dev,
unsigned long int request,
case VHOST_SET_VRING_NUM:
case VHOST_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_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_SET_VRING_ADDR:
memcpy(&msg.addr, arg, sizeof(struct vhost_vring_addr));
+ msg.addr.index += dev->vq_index;
msg.size = sizeof(m.addr);
break;
@@ -271,7 +274,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned
long int request,
case VHOST_SET_VRING_CALL:
case VHOST_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;
@@ -313,6 +316,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned
long int request,
error_report("Received bad msg size.\n");
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 24e050c..1ea2f98 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -134,25 +134,27 @@ static void net_vhost_user_event(void *opaque, int event)
static int net_vhost_user_init(NetClientState *peer, const char *device,
const char *name, CharDriverState *chr,
- bool vhostforce)
+ bool vhostforce, 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;
- s->vhostforce = vhostforce;
-
- 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->vhostforce = vhostforce;
+ qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
+ }
return 0;
}
@@ -228,6 +230,7 @@ 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;
bool vhostforce;
@@ -254,5 +257,13 @@ int net_init_vhost_user(const NetClientOptions *opts,
const char *name,
vhostforce = false;
}
- return net_vhost_user_init(peer, "vhost_user", name, chr, vhostforce);
+ /* 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, vhostforce,
+ queues);
}
diff --git a/qapi-schema.json b/qapi-schema.json
index 9ffdcf8..aa3bb6f 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2208,12 +2208,15 @@
#
# @vhostforce: #optional vhost on for non-MSIX virtio guests (default: false).
#
+# @queues: #optional number of queues to be created for multiqueue vhost-user
+#
# Since 2.1
##
{ 'type': 'NetdevVhostUserOptions',
'data': {
'chardev': 'str',
- '*vhostforce': 'bool' } }
+ '*vhostforce': 'bool',
+ '*queues': 'uint32' } }
##
# @NetClientOptions
diff --git a/qemu-options.hx b/qemu-options.hx
index 64af16d..23f010f 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1893,13 +1893,14 @@ 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.
address@hidden -netdev vhost-user,address@hidden,vhostforce=on|off]
address@hidden -netdev vhost-user,address@hidden,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
address@hidden
address@hidden Use 'address@hidden' to specify the number of queues to
+be created for multiqueue vhost-user.
Example:
@example
- [Qemu-devel] [PATCH] vhost-user: multiqueue support,
Nikolay Nikolaev <=