cxgb4vf: Implement "Unhandled Interrupts" statistic

Implement "Unhandled Interrupts" statistic so we can detect when the
hardware tells us that it things we have work to do but we don't find
anything ...

Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/cxgb4vf/sge.c b/drivers/net/cxgb4vf/sge.c
index 4bc1858dc303..37c6354547c7 100644
--- a/drivers/net/cxgb4vf/sge.c
+++ b/drivers/net/cxgb4vf/sge.c
@@ -1772,6 +1772,9 @@ static int napi_rx_handler(struct napi_struct *napi, int budget)
         } else
                 intr_params = QINTR_TIMER_IDX(SGE_TIMER_UPD_CIDX);
 
+        if (unlikely(work_done == 0))
+                rspq->unhandled_irqs++;
+
         t4_write_reg(rspq->adapter,
                      T4VF_SGE_BASE_ADDR + SGE_VF_GTS,
                      CIDXINC(work_done) |