net: hv_netvsc: fix loss of early receive events from host during channel open.

The hv_netvsc driver currently enables NAPI after opening the primary and
subchannels. This ordering creates a race: if the Hyper-V host places data
in the host -> guest ring buffer and signals the channel before
napi_enable() has been called, the channel callback will run but
napi_schedule_prep() will return false. As a result, the NAPI poller never
gets scheduled, the data in the ring buffer is not consumed, and the
receive queue may remain permanently stuck until another interrupt happens
to arrive.

Fix this by enabling NAPI and registering it with the RX/TX queues before
vmbus channel is opened. This guarantees that any early host signal after
open will correctly trigger NAPI scheduling and the ring buffer will be
drained.

Fixes: 76bb5db5c749d ("netvsc: fix use after free on module removal")
Signed-off-by: Dipayaan Roy <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/hyperv/netvsc.c

···
 
 	/* Enable NAPI handler before init callbacks */
 	netif_napi_add(ndev, &net_device->chan_table[0].napi, netvsc_poll);
+	napi_enable(&net_device->chan_table[0].napi);
+	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_RX,
+			     &net_device->chan_table[0].napi);
+	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_TX,
+			     &net_device->chan_table[0].napi);
 
 	/* Open the channel */
 	device->channel->next_request_id_callback = vmbus_next_request_id;
···
 	/* Channel is opened */
 	netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
 
-	napi_enable(&net_device->chan_table[0].napi);
-	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_RX,
-			     &net_device->chan_table[0].napi);
-	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_TX,
-			     &net_device->chan_table[0].napi);
-
 	/* Connect with the NetVsp */
 	ret = netvsc_connect_vsp(device, net_device, device_info);
 	if (ret != 0) {
···
 
 close:
 	RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
-	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_TX, NULL);
-	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_RX, NULL);
-	napi_disable(&net_device->chan_table[0].napi);
 
 	/* Now, we can close the channel safely */
 	vmbus_close(device->channel);
 
 cleanup:
+	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_TX, NULL);
+	netif_queue_set_napi(ndev, 0, NETDEV_QUEUE_TYPE_RX, NULL);
+	napi_disable(&net_device->chan_table[0].napi);
 	netif_napi_del(&net_device->chan_table[0].napi);
 
 cleanup2:

drivers/net/hyperv/rndis_filter.c

···
 	new_sc->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
 	new_sc->max_pkt_size = NETVSC_MAX_PKT_SIZE;
 
+	/* Enable napi before opening the vmbus channel to avoid races
+	 * as the host placing data on the host->guest ring may be left
+	 * out if napi was not enabled.
+	 */
+	napi_enable(&nvchan->napi);
+	netif_queue_set_napi(ndev, chn_index, NETDEV_QUEUE_TYPE_RX,
+			     &nvchan->napi);
+	netif_queue_set_napi(ndev, chn_index, NETDEV_QUEUE_TYPE_TX,
+			     &nvchan->napi);
+
 	ret = vmbus_open(new_sc, netvsc_ring_bytes,
 			 netvsc_ring_bytes, NULL, 0,
 			 netvsc_channel_cb, nvchan);
-	if (ret == 0) {
-		napi_enable(&nvchan->napi);
-		netif_queue_set_napi(ndev, chn_index, NETDEV_QUEUE_TYPE_RX,
-				     &nvchan->napi);
-		netif_queue_set_napi(ndev, chn_index, NETDEV_QUEUE_TYPE_TX,
-				     &nvchan->napi);
-	} else {
+	if (ret != 0) {
 		netdev_notice(ndev, "sub channel open failed: %d\n", ret);
+		netif_queue_set_napi(ndev, chn_index, NETDEV_QUEUE_TYPE_TX,
+				     NULL);
+		netif_queue_set_napi(ndev, chn_index, NETDEV_QUEUE_TYPE_RX,
+				     NULL);
+		napi_disable(&nvchan->napi);
 	}
 
 	if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)