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-rw-r--r--docs/specs/vhost-user.txt15
-rw-r--r--hw/net/vhost_net.c10
-rw-r--r--hw/virtio/vhost-user.c22
-rw-r--r--hw/virtio/vhost.c5
-rw-r--r--net/vhost-user.c141
-rw-r--r--qapi-schema.json6
-rw-r--r--qemu-options.hx5
7 files changed, 147 insertions, 57 deletions
diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt
index 43db9b4..cfc9d41 100644
--- a/docs/specs/vhost-user.txt
+++ b/docs/specs/vhost-user.txt
@@ -135,6 +135,21 @@ As older slaves don't support negotiating protocol features,
a feature bit was dedicated for this purpose:
#define VHOST_USER_F_PROTOCOL_FEATURES 30
+Multiple queue support
+----------------------
+
+Multiple queue is treated as a protocol extension, hence the slave has to
+implement protocol features first. The multiple queues feature is supported
+only when the protocol feature VHOST_USER_PROTOCOL_F_MQ (bit 0) is set:
+#define VHOST_USER_PROTOCOL_F_MQ 0
+
+The max number of queues the slave supports can be queried with message
+VHOST_USER_GET_PROTOCOL_FEATURES. Master should stop when the number of
+requested queues is bigger than that.
+
+As all queues share one connection, the master uses a unique index for each
+queue in the sent message to identify a specified queue.
+
Message types
-------------
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index f663e5a..ad82b5c 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -148,8 +148,11 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
fprintf(stderr, "vhost-net requires net backend to be setup\n");
goto fail;
}
+ net->nc = options->net_backend;
net->dev.max_queues = 1;
+ net->dev.nvqs = 2;
+ net->dev.vqs = net->vqs;
if (backend_kernel) {
r = vhost_net_get_fd(options->net_backend);
@@ -164,11 +167,10 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
net->dev.backend_features = 0;
net->dev.protocol_features = 0;
net->backend = -1;
- }
- net->nc = options->net_backend;
- net->dev.nvqs = 2;
- net->dev.vqs = net->vqs;
+ /* vhost-user needs vq_index to initiate a specific queue pair */
+ net->dev.vq_index = net->nc->queue_index * net->dev.nvqs;
+ }
r = vhost_dev_init(&net->dev, options->opaque,
options->backend_type);
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 5018fd6..e42fde6 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -187,6 +187,19 @@ static int vhost_user_write(struct vhost_dev *dev, VhostUserMsg *msg,
0 : -1;
}
+static bool vhost_user_one_time_request(VhostUserRequest request)
+{
+ switch (request) {
+ case VHOST_USER_SET_OWNER:
+ case VHOST_USER_RESET_DEVICE:
+ case VHOST_USER_SET_MEM_TABLE:
+ case VHOST_USER_GET_QUEUE_NUM:
+ return true;
+ default:
+ return false;
+ }
+}
+
static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
void *arg)
{
@@ -207,6 +220,15 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
msg_request = request;
}
+ /*
+ * For non-vring specific requests, like VHOST_USER_SET_MEM_TABLE,
+ * we just need send it once in the first time. For later such
+ * request, we just ignore it.
+ */
+ if (vhost_user_one_time_request(msg_request) && dev->vq_index != 0) {
+ return 0;
+ }
+
msg.request = msg_request;
msg.flags = VHOST_USER_VERSION;
msg.size = 0;
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 7a7812d..c0ed5b2 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -874,8 +874,9 @@ static void vhost_eventfd_del(MemoryListener *listener,
static int vhost_virtqueue_init(struct vhost_dev *dev,
struct vhost_virtqueue *vq, int n)
{
+ int vhost_vq_index = dev->vhost_ops->vhost_backend_get_vq_index(dev, n);
struct vhost_vring_file file = {
- .index = n,
+ .index = vhost_vq_index,
};
int r = event_notifier_init(&vq->masked_notifier, 0);
if (r < 0) {
@@ -926,7 +927,7 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
}
for (i = 0; i < hdev->nvqs; ++i) {
- r = vhost_virtqueue_init(hdev, hdev->vqs + i, i);
+ r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i);
if (r < 0) {
goto fail_vq;
}
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 93dcecd..8f354eb 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -14,6 +14,7 @@
#include "sysemu/char.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
+#include "qmp-commands.h"
typedef struct VhostUserState {
NetClientState nc;
@@ -39,37 +40,77 @@ static int vhost_user_running(VhostUserState *s)
return (s->vhost_net) ? 1 : 0;
}
-static int vhost_user_start(VhostUserState *s)
+static void vhost_user_stop(int queues, NetClientState *ncs[])
{
- VhostNetOptions options;
-
- if (vhost_user_running(s)) {
- return 0;
- }
+ VhostUserState *s;
+ int i;
- options.backend_type = VHOST_BACKEND_TYPE_USER;
- options.net_backend = &s->nc;
- options.opaque = s->chr;
+ for (i = 0; i < queues; i++) {
+ assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
- s->vhost_net = vhost_net_init(&options);
+ s = DO_UPCAST(VhostUserState, nc, ncs[i]);
+ if (!vhost_user_running(s)) {
+ continue;
+ }
- return vhost_user_running(s) ? 0 : -1;
+ if (s->vhost_net) {
+ vhost_net_cleanup(s->vhost_net);
+ s->vhost_net = NULL;
+ }
+ }
}
-static void vhost_user_stop(VhostUserState *s)
+static int vhost_user_start(int queues, NetClientState *ncs[])
{
- if (vhost_user_running(s)) {
- vhost_net_cleanup(s->vhost_net);
+ VhostNetOptions options;
+ VhostUserState *s;
+ int max_queues;
+ int i;
+
+ options.backend_type = VHOST_BACKEND_TYPE_USER;
+
+ for (i = 0; i < queues; i++) {
+ assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
+
+ s = DO_UPCAST(VhostUserState, nc, ncs[i]);
+ if (vhost_user_running(s)) {
+ continue;
+ }
+
+ options.net_backend = ncs[i];
+ options.opaque = s->chr;
+ s->vhost_net = vhost_net_init(&options);
+ if (!s->vhost_net) {
+ error_report("failed to init vhost_net for queue %d\n", i);
+ goto err;
+ }
+
+ if (i == 0) {
+ max_queues = vhost_net_get_max_queues(s->vhost_net);
+ if (queues > max_queues) {
+ error_report("you are asking more queues than "
+ "supported: %d\n", max_queues);
+ goto err;
+ }
+ }
}
- s->vhost_net = 0;
+ return 0;
+
+err:
+ vhost_user_stop(i + 1, ncs);
+ return -1;
}
static void vhost_user_cleanup(NetClientState *nc)
{
VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
- vhost_user_stop(s);
+ if (s->vhost_net) {
+ vhost_net_cleanup(s->vhost_net);
+ s->vhost_net = NULL;
+ }
+
qemu_purge_queued_packets(nc);
}
@@ -95,59 +136,61 @@ static NetClientInfo net_vhost_user_info = {
.has_ufo = vhost_user_has_ufo,
};
-static void net_vhost_link_down(VhostUserState *s, bool 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);
- }
-}
-
static void net_vhost_user_event(void *opaque, int event)
{
- VhostUserState *s = opaque;
+ const char *name = opaque;
+ NetClientState *ncs[MAX_QUEUE_NUM];
+ VhostUserState *s;
+ Error *err = NULL;
+ int queues;
+ queues = qemu_find_net_clients_except(name, ncs,
+ NET_CLIENT_OPTIONS_KIND_NIC,
+ MAX_QUEUE_NUM);
+ s = DO_UPCAST(VhostUserState, nc, ncs[0]);
switch (event) {
case CHR_EVENT_OPENED:
- vhost_user_start(s);
- net_vhost_link_down(s, false);
+ if (vhost_user_start(queues, ncs) < 0) {
+ exit(1);
+ }
+ qmp_set_link(name, true, &err);
error_report("chardev \"%s\" went up", s->chr->label);
break;
case CHR_EVENT_CLOSED:
- net_vhost_link_down(s, true);
- vhost_user_stop(s);
+ qmp_set_link(name, true, &err);
+ vhost_user_stop(queues, ncs);
error_report("chardev \"%s\" went down", s->chr->label);
break;
}
+
+ if (err) {
+ error_report_err(err);
+ }
}
static int net_vhost_user_init(NetClientState *peer, const char *device,
- const char *name, CharDriverState *chr)
+ const char *name, CharDriverState *chr,
+ int 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);
+ /* We don't provide a receive callback */
+ nc->receive_disabled = 1;
+ nc->queue_index = i;
- /* We don't provide a receive callback */
- s->nc.receive_disabled = 1;
- s->chr = chr;
+ s = DO_UPCAST(VhostUserState, nc, nc);
+ s->chr = chr;
+ }
- qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
+ qemu_chr_add_handlers(chr, NULL, NULL, net_vhost_user_event, (void*)name);
return 0;
}
@@ -226,6 +269,7 @@ static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
int net_init_vhost_user(const NetClientOptions *opts, const char *name,
NetClientState *peer, Error **errp)
{
+ int queues;
const NetdevVhostUserOptions *vhost_user_opts;
CharDriverState *chr;
@@ -243,6 +287,7 @@ int net_init_vhost_user(const NetClientOptions *opts, const char *name,
return -1;
}
+ queues = vhost_user_opts->has_queues ? vhost_user_opts->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 527690d..582a817 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2481,12 +2481,16 @@
#
# @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': 'int' } }
##
# @NetClientOptions
diff --git a/qemu-options.hx b/qemu-options.hx
index 7e147b8..328404c 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1990,13 +1990,14 @@ 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
generated by cgit v1.1 at 2024-12-28 15:09:49 +0000