igb: add counter for dma out of sync errors

Add a counter for dma out of sync errors reported via interrupt.

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>

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 8c27e0a23df..c05ca3461f6 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -689,7 +689,7 @@ static void igb_irq_enable(struct igb_adapter *adapter)
                 wr32(E1000_EIAC, adapter->eims_enable_mask);
                 wr32(E1000_EIAM, adapter->eims_enable_mask);
                 wr32(E1000_EIMS, adapter->eims_enable_mask);
-                wr32(E1000_IMS, E1000_IMS_LSC);
+                wr32(E1000_IMS, E1000_IMS_LSC | E1000_IMS_DOUTSYNC);
         } else {
                 wr32(E1000_IMS, IMS_ENABLE_MASK);
                 wr32(E1000_IAM, IMS_ENABLE_MASK);
@@ -3287,6 +3287,11 @@ static irqreturn_t igb_msix_other(int irq, void *data)
         u32 icr = rd32(E1000_ICR);
 
         /* reading ICR causes bit 31 of EICR to be cleared */
+
+        if(icr & E1000_ICR_DOUTSYNC) {
+                /* HW is reporting DMA is out of sync */
+                adapter->stats.doosync++;
+        }
         if (!(icr & E1000_ICR_LSC))
                 goto no_link_interrupt;
         hw->mac.get_link_status = 1;
@@ -3295,7 +3300,7 @@ static irqreturn_t igb_msix_other(int irq, void *data)
                 mod_timer(&adapter->watchdog_timer, jiffies + 1);
         
 no_link_interrupt:
-        wr32(E1000_IMS, E1000_IMS_LSC);
+        wr32(E1000_IMS, E1000_IMS_LSC | E1000_IMS_DOUTSYNC);
         wr32(E1000_EIMS, adapter->eims_other);
 
         return IRQ_HANDLED;
@@ -3499,6 +3504,11 @@ static irqreturn_t igb_intr_msi(int irq, void *data)
 
         igb_write_itr(adapter->rx_ring);
 
+        if(icr & E1000_ICR_DOUTSYNC) {
+                /* HW is reporting DMA is out of sync */
+                adapter->stats.doosync++;
+        }
+
         if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
                 hw->mac.get_link_status = 1;
                 if (!test_bit(__IGB_DOWN, &adapter->state))
@@ -3534,6 +3544,11 @@ static irqreturn_t igb_intr(int irq, void *data)
         if (!(icr & E1000_ICR_INT_ASSERTED))
                 return IRQ_NONE;
 
+        if(icr & E1000_ICR_DOUTSYNC) {
+                /* HW is reporting DMA is out of sync */
+                adapter->stats.doosync++;
+        }
+
         eicr = rd32(E1000_EICR);
 
         if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {