From 7f863302bdb8c2d231e3d0927e0355e3c10d0cfb Mon Sep 17 00:00:00 2001 From: Kangjie Xu Date: Mon, 17 Oct 2022 17:25:56 +0800 Subject: [PATCH] virtio-net: support queue_enable Support queue_enable in vhost-kernel scenario. It can be called when a vq reset operation has been performed and the vq is restared. It should be noted that we can restart the vq when the vhost has already started. When launching a new vhost device, the vhost is not started and all vqs are not initalized until VIRTIO_PCI_COMMON_STATUS is written. Thus, we should use vhost_started to differentiate the two cases: vq reset and device start. Currently it only supports vhost-kernel. Signed-off-by: Kangjie Xu Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20221017092558.111082-14-xuanzhuo@linux.alibaba.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/net/virtio-net.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 34fb4b1423..e68daf51bb 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -563,6 +563,26 @@ static void virtio_net_queue_reset(VirtIODevice *vdev, uint32_t queue_index) flush_or_purge_queued_packets(nc); } +static void virtio_net_queue_enable(VirtIODevice *vdev, uint32_t queue_index) +{ + VirtIONet *n = VIRTIO_NET(vdev); + NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(queue_index)); + int r; + + if (!nc->peer || !vdev->vhost_started) { + return; + } + + if (get_vhost_net(nc->peer) && + nc->peer->info->type == NET_CLIENT_DRIVER_TAP) { + r = vhost_net_virtqueue_restart(vdev, nc, queue_index); + if (r < 0) { + error_report("unable to restart vhost net virtqueue: %d, " + "when resetting the queue", queue_index); + } + } +} + static void virtio_net_reset(VirtIODevice *vdev) { VirtIONet *n = VIRTIO_NET(vdev); @@ -3845,6 +3865,7 @@ static void virtio_net_class_init(ObjectClass *klass, void *data) vdc->bad_features = virtio_net_bad_features; vdc->reset = virtio_net_reset; vdc->queue_reset = virtio_net_queue_reset; + vdc->queue_enable = virtio_net_queue_enable; vdc->set_status = virtio_net_set_status; vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; -- 2.11.4.GIT