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i40e: add statistic indicating number of skipped Tx timestamps

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The i40e driver can only handle one Tx timestamp request at a time.
This means it is possible for an application timestamp request to be
ignored.

There is no easy way for an administrator to determine if this occurred.
Add a new statistic which tracks this, tx_hwtstamp_skipped.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jacob Keller
2017-05-03 10:28:58 -07:00
committed by Jeff Kirsher
parent 69077577af
commit 2955faca04
3 changed files with 3 additions and 0 deletions
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drivers/net/ethernet/intel/i40e/i40e.h
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@@ -506,6 +506,7 @@ struct i40e_pf {
struct mutex tmreg_lock; /* Used to protect the SYSTIME registers. */
u64 ptp_base_adj;
u32 tx_hwtstamp_timeouts;
u32 tx_hwtstamp_skipped;
u32 rx_hwtstamp_cleared;
u32 latch_event_flags;
spinlock_t ptp_rx_lock; /* Used to protect Rx timestamp registers. */