igbvf: avoid reset storms due to mailbox issues

From: Alexander Duyck <alexander.h.duyck@intel.com>

This change makes it so that reset/interrupt storms can be avoided when
there are mailbox issues.  The new behavior is to only allow the device to
trigger mailbox related resets only once every 10 seconds.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/igbvf/igbvf.h b/drivers/net/igbvf/igbvf.h
index 3d1ee7a..a1774b2 100644 (file)
--- a/drivers/net/igbvf/igbvf.h
+++ b/drivers/net/igbvf/igbvf.h
@@ -276,6 +276,7 @@ struct igbvf_adapter {
        unsigned long led_status;
 
        unsigned int flags;
+       unsigned long last_reset;
 };
 
 struct igbvf_info {

diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index a127620..e9dd95f 100644 (file)
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -1469,6 +1469,8 @@ static void igbvf_reset(struct igbvf_adapter *adapter)
                memcpy(netdev->perm_addr, adapter->hw.mac.addr,
                       netdev->addr_len);
        }
+
+       adapter->last_reset = jiffies;
 }
 
 int igbvf_up(struct igbvf_adapter *adapter)
@@ -1812,11 +1814,15 @@ static bool igbvf_has_link(struct igbvf_adapter *adapter)
        s32 ret_val = E1000_SUCCESS;
        bool link_active;
 
+       /* If interface is down, stay link down */
+       if (test_bit(__IGBVF_DOWN, &adapter->state))
+               return false;
+
        ret_val = hw->mac.ops.check_for_link(hw);
        link_active = !hw->mac.get_link_status;
 
        /* if check for link returns error we will need to reset */
-       if (ret_val)
+       if (ret_val && time_after(jiffies, adapter->last_reset + (10 * HZ)))
                schedule_work(&adapter->reset_task);
 
        return link_active;