i40e/i40evf: Add a stat to track how many times we have to do a force WB
When in NAPI with interrupts disabled, the HW needs to be forced to do a
write back on TX if the number of descriptors pending are less than a
cache line.
This stat helps keep track of how many times we get into this situation.
Change-ID: I76c1bcc7ebccd6bffcc5aa33bfe05f2fa1c9a984
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
index a4eea08..8629a9f 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -1363,8 +1363,10 @@
/* If work not completed, return budget and polling will return */
if (!clean_complete) {
tx_only:
- if (arm_wb)
+ if (arm_wb) {
+ q_vector->tx.ring[0].tx_stats.tx_force_wb++;
i40evf_force_wb(vsi, q_vector);
+ }
return budget;
}
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
index ebc1bf7..997b374 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
@@ -201,6 +201,7 @@
u64 tx_busy;
u64 tx_done_old;
u64 tx_linearize;
+ u64 tx_force_wb;
};
struct i40e_rx_queue_stats {