RDMA/nes: Fix incorrect SFP+ link status detection on driver init

During iw_nes initialization the link status for SFP+ PHY is always
detected as "up" regardless of real state (cable either connected or
disconnected).  Add SFP+ PHY specific link status detection to the
iw_nes initialization procedure.  Use link status recheck for
netdev_open to detect delayed state updates.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 39 insertions, 4 deletions

diff --git a/drivers/infiniband/hw/nes/nes_nic.c b/drivers/infiniband/hw/nes/nes_nic.c
index 81052fbcd9ba..2c9c1933bbe3 100644
--- a/drivers/infiniband/hw/nes/nes_nic.c
+++ b/drivers/infiniband/hw/nes/nes_nic.c
@@ -241,6 +241,15 @@ static int nes_netdev_open(struct net_device *netdev)
                 netif_carrier_on(netdev);
         }
 
+        spin_lock_irqsave(&nesdev->nesadapter->phy_lock, flags);
+        if (nesdev->nesadapter->phy_type[nesdev->mac_index] == NES_PHY_TYPE_SFP_D) {
+                if (nesdev->link_recheck)
+                        cancel_delayed_work(&nesdev->work);
+                nesdev->link_recheck = 1;
+                schedule_delayed_work(&nesdev->work, NES_LINK_RECHECK_DELAY);
+        }
+        spin_unlock_irqrestore(&nesdev->nesadapter->phy_lock, flags);
+
         spin_lock_irqsave(&nesvnic->port_ibevent_lock, flags);
         if (nesvnic->of_device_registered) {
                 nesdev->nesadapter->send_term_ok = 1;
@@ -1782,8 +1791,11 @@ struct net_device *nes_netdev_init(struct nes_device *nesdev,
               (((PCI_FUNC(nesdev->pcidev->devfn) == 1) && (nesdev->mac_index == 2)) ||
                ((PCI_FUNC(nesdev->pcidev->devfn) == 2) && (nesdev->mac_index == 1)))))) {
                 u32 u32temp;
-                u32 link_mask;
-                u32 link_val;
+                u32 link_mask = 0;
+                u32 link_val = 0;
+                u16 temp_phy_data;
+                u16 phy_data = 0;
+                unsigned long flags;
 
                 u32temp = nes_read_indexed(nesdev, NES_IDX_PHY_PCS_CONTROL_STATUS0 +
                                 (0x200 * (nesdev->mac_index & 1)));
@@ -1805,6 +1817,23 @@ struct net_device *nes_netdev_init(struct nes_device *nesdev,
                                 link_val = 0x02020000;
                         }
                         break;
+                case NES_PHY_TYPE_SFP_D:
+                        spin_lock_irqsave(&nesdev->nesadapter->phy_lock, flags);
+                        nes_read_10G_phy_reg(nesdev,
+                                             nesdev->nesadapter->phy_index[nesdev->mac_index],
+                                             1, 0x9003);
+                        temp_phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
+                        nes_read_10G_phy_reg(nesdev,
+                                             nesdev->nesadapter->phy_index[nesdev->mac_index],
+                                             3, 0x0021);
+                        nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
+                        nes_read_10G_phy_reg(nesdev,
+                                             nesdev->nesadapter->phy_index[nesdev->mac_index],
+                                             3, 0x0021);
+                        phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
+                        spin_unlock_irqrestore(&nesdev->nesadapter->phy_lock, flags);
+                        phy_data = (!temp_phy_data && (phy_data == 0x8000)) ? 0x4 : 0x0;
+                        break;
                 default:
                         link_mask = 0x0f1f0000;
                         link_val = 0x0f0f0000;
@@ -1814,8 +1843,14 @@ struct net_device *nes_netdev_init(struct nes_device *nesdev,
                 u32temp = nes_read_indexed(nesdev,
                                            NES_IDX_PHY_PCS_CONTROL_STATUS0 +
                                            (0x200 * (nesdev->mac_index & 1)));
-                if ((u32temp & link_mask) == link_val)
-                        nesvnic->linkup = 1;
+
+                if (phy_type == NES_PHY_TYPE_SFP_D) {
+                        if (phy_data & 0x0004)
+                                nesvnic->linkup = 1;
+                } else {
+                        if ((u32temp & link_mask) == link_val)
+                                nesvnic->linkup = 1;
+                }
 
                 /* clear the MAC interrupt status, assumes direct logical to physical mapping */
                 u32temp = nes_read_indexed(nesdev, NES_IDX_MAC_INT_STATUS + (0x200 * nesdev->mac_index));