ixgbevf: add netpoll support

This patch adds ixgbevf_netpoll() a callback for .ndo_poll_controller to
allow for the VF interface to be used with netconsole.

CC: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 23 insertions, 6 deletions

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 70a2b8fe40ba..755f71f07ae1 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -344,10 +344,8 @@ static void ixgbevf_rx_skb(struct ixgbevf_q_vector *q_vector,
                 return;
         }
 #endif /* CONFIG_NET_RX_BUSY_POLL */
-        if (!(q_vector->adapter->flags & IXGBE_FLAG_IN_NETPOLL))
-                napi_gro_receive(&q_vector->napi, skb);
-        else
-                netif_rx(skb);
+
+        napi_gro_receive(&q_vector->napi, skb);
 }
 
 /* ixgbevf_rx_checksum - indicate in skb if hw indicated a good cksum
@@ -919,12 +917,10 @@ static int ixgbevf_poll(struct napi_struct *napi, int budget)
         else
                 per_ring_budget = budget;
 
-        adapter->flags |= IXGBE_FLAG_IN_NETPOLL;
         ixgbevf_for_each_ring(ring, q_vector->rx)
                 clean_complete &= (ixgbevf_clean_rx_irq(q_vector, ring,
                                                         per_ring_budget)
                                    < per_ring_budget);
-        adapter->flags &= ~IXGBE_FLAG_IN_NETPOLL;
 
 #ifdef CONFIG_NET_RX_BUSY_POLL
         ixgbevf_qv_unlock_napi(q_vector);
@@ -3553,6 +3549,24 @@ static int ixgbevf_change_mtu(struct net_device *netdev, int new_mtu)
         return 0;
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+static void ixgbevf_netpoll(struct net_device *netdev)
+{
+        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
+        int i;
+
+        /* if interface is down do nothing */
+        if (test_bit(__IXGBEVF_DOWN, &adapter->state))
+                return;
+        for (i = 0; i < adapter->num_rx_queues; i++)
+                ixgbevf_msix_clean_rings(0, adapter->q_vector[i]);
+}
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+
 static int ixgbevf_suspend(struct pci_dev *pdev, pm_message_t state)
 {
         struct net_device *netdev = pci_get_drvdata(pdev);
@@ -3689,6 +3703,9 @@ static const struct net_device_ops ixgbevf_netdev_ops = {
 #ifdef CONFIG_NET_RX_BUSY_POLL
         .ndo_busy_poll          = ixgbevf_busy_poll_recv,
 #endif
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        .ndo_poll_controller    = ixgbevf_netpoll,
+#endif
 };
 
 static void ixgbevf_assign_netdev_ops(struct net_device *dev)