1 files changed, 41 insertions, 60 deletions

diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index b36643ef0593..0433fdebda25 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -1726,6 +1726,8 @@ static int enic_open(struct net_device *netdev)
 	}
 
 	for (i = 0; i < enic->rq_count; i++) {
+		/* enable rq before updating rq desc */
+		vnic_rq_enable(&enic->rq[i]);
 		vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
 		/* Need at least one buffer on ring to get going */
 		if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
@@ -1737,8 +1739,6 @@ static int enic_open(struct net_device *netdev)
 
 	for (i = 0; i < enic->wq_count; i++)
 		vnic_wq_enable(&enic->wq[i]);
-	for (i = 0; i < enic->rq_count; i++)
-		vnic_rq_enable(&enic->rq[i]);
 
 	if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
 		enic_dev_add_station_addr(enic);
@@ -1760,13 +1760,17 @@ static int enic_open(struct net_device *netdev)
 		vnic_intr_unmask(&enic->intr[i]);
 
 	enic_notify_timer_start(enic);
-	enic_rfs_flw_tbl_init(enic);
+	enic_rfs_timer_start(enic);
 
 	return 0;
 
 err_out_free_rq:
-	for (i = 0; i < enic->rq_count; i++)
+	for (i = 0; i < enic->rq_count; i++) {
+		err = vnic_rq_disable(&enic->rq[i]);
+		if (err)
+			return err;
 		vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
+	}
 	enic_dev_notify_unset(enic);
 err_out_free_intr:
 	enic_unset_affinity_hint(enic);
@@ -1838,10 +1842,32 @@ static int enic_stop(struct net_device *netdev)
 	return 0;
 }
 
+static int _enic_change_mtu(struct net_device *netdev, int new_mtu)
+{
+	bool running = netif_running(netdev);
+	int err = 0;
+
+	ASSERT_RTNL();
+	if (running) {
+		err = enic_stop(netdev);
+		if (err)
+			return err;
+	}
+
+	netdev->mtu = new_mtu;
+
+	if (running) {
+		err = enic_open(netdev);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
 {
 	struct enic *enic = netdev_priv(netdev);
-	int running = netif_running(netdev);
 
 	if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
 		return -EINVAL;
@@ -1849,20 +1875,12 @@ static int enic_change_mtu(struct net_device *netdev, int new_mtu)
 	if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
 		return -EOPNOTSUPP;
 
-	if (running)
-		enic_stop(netdev);
-
-	netdev->mtu = new_mtu;
-
 	if (netdev->mtu > enic->port_mtu)
 		netdev_warn(netdev,
-			"interface MTU (%d) set higher than port MTU (%d)\n",
-			netdev->mtu, enic->port_mtu);
-
-	if (running)
-		enic_open(netdev);
+			    "interface MTU (%d) set higher than port MTU (%d)\n",
+			    netdev->mtu, enic->port_mtu);
 
-	return 0;
+	return _enic_change_mtu(netdev, new_mtu);
 }
 
 static void enic_change_mtu_work(struct work_struct *work)
@@ -1870,47 +1888,9 @@ 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) {
-		rtnl_unlock();
-		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) {
-		rtnl_unlock();
-		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);
-
+	(void)_enic_change_mtu(netdev, new_mtu);
 	rtnl_unlock();
 
 	netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
@@ -2539,11 +2519,11 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	pci_set_master(pdev);
 
 	/* Query PCI controller on system for DMA addressing
-	 * limitation for the device.  Try 64-bit first, and
+	 * limitation for the device.  Try 47-bit first, and
 	 * fail to 32-bit.
 	 */
 
-	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(47));
 	if (err) {
 		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 		if (err) {
@@ -2557,10 +2537,10 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			goto err_out_release_regions;
 		}
 	} else {
-		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(47));
 		if (err) {
 			dev_err(dev, "Unable to obtain %u-bit DMA "
-				"for consistent allocations, aborting\n", 64);
+				"for consistent allocations, aborting\n", 47);
 			goto err_out_release_regions;
 		}
 		using_dac = 1;
@@ -2690,6 +2670,7 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	enic->notify_timer.function = enic_notify_timer;
 	enic->notify_timer.data = (unsigned long)enic;
 
+	enic_rfs_flw_tbl_init(enic);
 	enic_set_rx_coal_setting(enic);
 	INIT_WORK(&enic->reset, enic_reset);
 	INIT_WORK(&enic->tx_hang_reset, enic_tx_hang_reset);
@@ -2702,7 +2683,6 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 */
 
 	enic->port_mtu = enic->config.mtu;
-	(void)enic_change_mtu(netdev, enic->port_mtu);
 
 	err = enic_set_mac_addr(netdev, enic->mac_addr);
 	if (err) {
@@ -2751,6 +2731,7 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		netdev->features |= NETIF_F_HIGHDMA;
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
+	netdev->mtu = enic->port_mtu;
 
 	err = register_netdev(netdev);
 	if (err) {