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igb: add statistic indicating number of skipped Tx timestamps

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The igb 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>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jacob Keller 2017-05-03 10:28:59 -07:00 committed by Jeff Kirsher
parent cff5714145
commit c3b8f85ec2
3 changed files with 4 additions and 0 deletions
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1
drivers/net/ethernet/intel/igb/igb.h
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@ -563,6 +563,7 @@ struct igb_adapter {
struct cyclecounter cc;
struct timecounter tc;
u32 tx_hwtstamp_timeouts;
u32 tx_hwtstamp_skipped;
u32 rx_hwtstamp_cleared;
bool pps_sys_wrap_on;

1
drivers/net/ethernet/intel/igb/igb_ethtool.c
View file

@ -90,6 +90,7 @@ static const struct igb_stats igb_gstrings_stats[] = {
IGB_STAT("os2bmc_tx_by_host", stats.o2bspc),
IGB_STAT("os2bmc_rx_by_host", stats.b2ogprc),
IGB_STAT("tx_hwtstamp_timeouts", tx_hwtstamp_timeouts),
IGB_STAT("tx_hwtstamp_skipped", tx_hwtstamp_skipped),
IGB_STAT("rx_hwtstamp_cleared", rx_hwtstamp_cleared),
};

2
drivers/net/ethernet/intel/igb/igb_main.c
View file

@ -5388,6 +5388,8 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb,
adapter->ptp_tx_start = jiffies;
if (adapter->hw.mac.type == e1000_82576)
schedule_work(&adapter->ptp_tx_work);
} else {
adapter->tx_hwtstamp_skipped++;
}
}