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vhost: skip access lock when vDPA is configured

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No need to take access lock in the vhost-user message handler when
vDPA driver controls all the data-path of the vhost device.

It allows the vDPA set_vring_state operation callback to configure
guest notifications.

Signed-off-by: Matan Azrad <matan@mellanox.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
This commit is contained in:
Matan Azrad 2020-06-29 14:08:17 +00:00 committed by Ferruh Yigit
parent 0329868d6a
commit 9f2016b2ce
1 changed files with 4 additions and 2 deletions
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6
lib/librte_vhost/vhost_user.c
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@ -2683,8 +2683,10 @@ vhost_user_msg_handler(int vid, int fd)
case VHOST_USER_SEND_RARP:
case VHOST_USER_NET_SET_MTU:
case VHOST_USER_SET_SLAVE_REQ_FD:
vhost_user_lock_all_queue_pairs(dev);
unlock_required = 1;
if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
vhost_user_lock_all_queue_pairs(dev);
unlock_required = 1;
}
break;
default:
break;