qlcnic: Limit vNIC support in legacy interrupt mode

o When the driver loads in legacy interrupt mode, only vNICs
  with PCI function number 0-7 are supported.

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 12 insertions, 1 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
index 4ea15bafe53f..7c125d7fb547 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
@@ -33,6 +33,7 @@ static void qlcnic_83xx_get_beacon_state(struct qlcnic_adapter *);
 #define RSS_HASHTYPE_IP_TCP             0x3
 #define QLC_83XX_FW_MBX_CMD             0
 #define QLC_SKIP_INACTIVE_PCI_REGS      7
+#define QLC_MAX_LEGACY_FUNC_SUPP        8
 
 static const struct qlcnic_mailbox_metadata qlcnic_83xx_mbx_tbl[] = {
         {QLCNIC_CMD_CONFIGURE_IP_ADDR, 6, 1},
@@ -357,8 +358,15 @@ int qlcnic_83xx_setup_intr(struct qlcnic_adapter *adapter)
         if (!ahw->intr_tbl)
                 return -ENOMEM;
 
-        if (!(adapter->flags & QLCNIC_MSIX_ENABLED))
+        if (!(adapter->flags & QLCNIC_MSIX_ENABLED)) {
+                if (adapter->ahw->pci_func >= QLC_MAX_LEGACY_FUNC_SUPP) {
+                        dev_err(&adapter->pdev->dev, "PCI function number 8 and higher are not supported with legacy interrupt, func 0x%x\n",
+                                ahw->pci_func);
+                        return -EOPNOTSUPP;
+                }
+
                 qlcnic_83xx_enable_legacy(adapter);
+        }
 
         for (i = 0; i < num_msix; i++) {
                 if (adapter->flags & QLCNIC_MSIX_ENABLED)
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index f2c9a199295d..7023d358baa9 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -2532,6 +2532,9 @@ qlcnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
                         case -ENOMEM:
                                 dev_err(&pdev->dev, "Adapter initialization failed. Please reboot\n");
                                 goto err_out_free_hw;
+                        case -EOPNOTSUPP:
+                                dev_err(&pdev->dev, "Adapter initialization failed\n");
+                                goto err_out_free_hw;
                         default:
                                 dev_err(&pdev->dev, "Adapter initialization failed. Driver will load in maintenance mode to recover the adapter using the application\n");
                                 goto err_out_maintenance_mode;