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authorChangchun Ouyang <changchun.ouyang@intel.com>2015-09-23 12:20:00 +0800
committerMichael S. Tsirkin <mst@redhat.com>2015-09-24 16:27:53 +0300
commitb931bfbf042983f311b3b09894d8030b2755a638 (patch)
tree106859e7073d63d131fb50d2932533728a829a0c /qapi-schema.json
parentfc57fd9900dc6344b8833e7641f63cddc6840301 (diff)
downloadqemu-arm-b931bfbf042983f311b3b09894d8030b2755a638.tar.gz
vhost-user: add multiple queue support
This patch is initially based a patch from Nikolay Nikolaev. This patch adds vhost-user multiple queue support, by creating a nc and vhost_net pair for each queue. Qemu exits if find that the backend can't support the number of requested queues (by providing queues=# option). The max number is queried by a new message, VHOST_USER_GET_QUEUE_NUM, and is sent only when protocol feature VHOST_USER_PROTOCOL_F_MQ is present first. The max queue check is done at vhost-user initiation stage. We initiate one queue first, which, in the meantime, also gets the max_queues the backend supports. In older version, it was reported that some messages are sent more times than necessary. Here we came an agreement with Michael that we could categorize vhost user messages to 2 types: non-vring specific messages, which should be sent only once, and vring specific messages, which should be sent per queue. Here I introduced a helper function vhost_user_one_time_request(), which lists following messages as non-vring specific messages: VHOST_USER_SET_OWNER VHOST_USER_RESET_DEVICE VHOST_USER_SET_MEM_TABLE VHOST_USER_GET_QUEUE_NUM For above messages, we simply ignore them when they are not sent the first time. Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
Diffstat (limited to 'qapi-schema.json')
-rw-r--r--qapi-schema.json6
1 files changed, 5 insertions, 1 deletions
diff --git a/qapi-schema.json b/qapi-schema.json
index 527690dfe0..582a817215 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