[PATCH v1 2/2] virtio-net: virtio_net_flush_tx() check for per-queue reset

[Xuan Zhuo <xuanzhuo@linux.alibaba.com>]

Check whether it is per-queue reset state in virtio_net_flush_tx().

Before per-queue reset, we need to recover async tx resources. At this
time, virtio_net_flush_tx() is called, but we should not try to send
new packets, so virtio_net_flush_tx() should check the current
per-queue reset state.

Fixes: 7dc6be52 ("virtio-net: support queue reset")
Fixes: https://gitlab.com/qemu-project/qemu/-/issues/1451
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 hw/net/virtio-net.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 3ae909041a..fba6451a50 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2627,7 +2627,8 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
     VirtQueueElement *elem;
     int32_t num_packets = 0;
     int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
-    if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+    if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) ||
+        virtio_queue_reset_state(q->tx_vq)) {
         return num_packets;
     }
 
-- 
2.32.0.3.g01195cf9f