i40e: Populate and check pci bus speed and width

[cascardo/linux.git] / drivers / net / ethernet / intel / i40e / i40e_main.c

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index f14b31c..22a2c0e 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -7369,6 +7369,7 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        struct i40e_pf *pf;
        struct i40e_hw *hw;
        static u16 pfs_found;
+       u16 link_status;
        int err = 0;
        u32 len;
 
@@ -7603,6 +7604,28 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        mod_timer(&pf->service_timer,
                  round_jiffies(jiffies + pf->service_timer_period));
 
+       /* Get the negotiated link width and speed from PCI config space */
+       pcie_capability_read_word(pf->pdev, PCI_EXP_LNKSTA, &link_status);
+
+       i40e_set_pci_config_data(hw, link_status);
+
+       dev_info(&pdev->dev, "PCI Express: %s %s\n",
+               (hw->bus.speed == i40e_bus_speed_8000 ? "Speed 8.0GT/s" :
+                hw->bus.speed == i40e_bus_speed_5000 ? "Speed 5.0GT/s" :
+                hw->bus.speed == i40e_bus_speed_2500 ? "Speed 2.5GT/s" :
+                "Unknown"),
+               (hw->bus.width == i40e_bus_width_pcie_x8 ? "Width x8" :
+                hw->bus.width == i40e_bus_width_pcie_x4 ? "Width x4" :
+                hw->bus.width == i40e_bus_width_pcie_x2 ? "Width x2" :
+                hw->bus.width == i40e_bus_width_pcie_x1 ? "Width x1" :
+                "Unknown"));
+
+       if (hw->bus.width < i40e_bus_width_pcie_x8 ||
+           hw->bus.speed < i40e_bus_speed_8000) {
+               dev_warn(&pdev->dev, "PCI-Express bandwidth available for this device may be insufficient for optimal performance.\n");
+               dev_warn(&pdev->dev, "Please move the device to a different PCI-e link with more lanes and/or higher transfer rate.\n");
+       }
+
        return 0;
 
        /* Unwind what we've done if something failed in the setup */