virtio-net: fix per queue coalescing parameter setting

When the user sets a non-zero coalescing parameter to 0 for a specific
virtqueue, it does not work as expected, so let's fix this.

Fixes: 394bd877 ("virtio_net: support per queue interrupt coalesce command")
Reported-by: Xiaoming Zhao <zxm377917@alibaba-inc.com>
Cc: Gavin Li <gavinl@nvidia.com>
Signed-off-by: Heng Qi <hengqi@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/virtio_net.c

@@ -3296,27 +3296,23 @@ static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
 {
 	int err;
 
-	if (ec->rx_coalesce_usecs || ec->rx_max_coalesced_frames) {
-		err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
-						    ec->rx_coalesce_usecs,
-						    ec->rx_max_coalesced_frames);
-		if (err)
-			return err;
-		/* Save parameters */
-		vi->rq[queue].intr_coal.max_usecs = ec->rx_coalesce_usecs;
-		vi->rq[queue].intr_coal.max_packets = ec->rx_max_coalesced_frames;
-	}
+	err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
+					    ec->rx_coalesce_usecs,
+					    ec->rx_max_coalesced_frames);
+	if (err)
+		return err;
 
-	if (ec->tx_coalesce_usecs || ec->tx_max_coalesced_frames) {
-		err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
-						    ec->tx_coalesce_usecs,
-						    ec->tx_max_coalesced_frames);
-		if (err)
-			return err;
-		/* Save parameters */
-		vi->sq[queue].intr_coal.max_usecs = ec->tx_coalesce_usecs;
-		vi->sq[queue].intr_coal.max_packets = ec->tx_max_coalesced_frames;
-	}
+	vi->rq[queue].intr_coal.max_usecs = ec->rx_coalesce_usecs;
+	vi->rq[queue].intr_coal.max_packets = ec->rx_max_coalesced_frames;
+
+	err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
+					    ec->tx_coalesce_usecs,
+					    ec->tx_max_coalesced_frames);
+	if (err)
+		return err;
+
+	vi->sq[queue].intr_coal.max_usecs = ec->tx_coalesce_usecs;
+	vi->sq[queue].intr_coal.max_packets = ec->tx_max_coalesced_frames;
 
 	return 0;
 }