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i40e/i40evf: Add a stat to track how many times we have to do a force WB

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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>
This commit is contained in:
Anjali Singhai Jain
2015-10-21 19:47:08 -04:00
committed by Jeff Kirsher
parent 4f2f017c61
commit 164c9f5463
7 changed files with 14 additions and 3 deletions
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4
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
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@@ -1363,8 +1363,10 @@ int i40evf_napi_poll(struct napi_struct *napi, int budget)
/* 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;
}

1
drivers/net/ethernet/intel/i40evf/i40e_txrx.h
View File

@@ -201,6 +201,7 @@ struct i40e_tx_queue_stats {
u64 tx_busy;
u64 tx_done_old;
u64 tx_linearize;
u64 tx_force_wb;
};
struct i40e_rx_queue_stats {