igb: add statistic indicating number of skipped Tx timestamps

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>

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index bf9bf90..be35edc 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -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;
 

diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
index 0efb62d..8730f7c 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -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),
 };
 

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index fefa461..06b81a6 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -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++;
                }
        }