+static void enic_change_mtu_work(struct work_struct *work)
+{
+ struct enic *enic = container_of(work, struct enic, change_mtu_work);
+ struct net_device *netdev = enic->netdev;
+ int new_mtu = vnic_dev_mtu(enic->vdev);
+ int err;
+ unsigned int i;
+
+ new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
+
+ rtnl_lock();
+
+ /* Stop RQ */
+ del_timer_sync(&enic->notify_timer);
+
+ for (i = 0; i < enic->rq_count; i++)
+ napi_disable(&enic->napi[i]);
+
+ vnic_intr_mask(&enic->intr[0]);
+ enic_synchronize_irqs(enic);
+ err = vnic_rq_disable(&enic->rq[0]);
+ if (err) {
+ netdev_err(netdev, "Unable to disable RQ.\n");
+ return;
+ }
+ vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
+ vnic_cq_clean(&enic->cq[0]);
+ vnic_intr_clean(&enic->intr[0]);
+
+ /* Fill RQ with new_mtu-sized buffers */
+ netdev->mtu = new_mtu;
+ vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
+ /* Need at least one buffer on ring to get going */
+ if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
+ netdev_err(netdev, "Unable to alloc receive buffers.\n");
+ return;
+ }
+
+ /* Start RQ */
+ vnic_rq_enable(&enic->rq[0]);
+ napi_enable(&enic->napi[0]);
+ vnic_intr_unmask(&enic->intr[0]);
+ enic_notify_timer_start(enic);
+
+ rtnl_unlock();
+
+ netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
+}
+