[net-next 07/11] igb: add statistic indicating number of skipped Tx timestamps

[Jeff Kirsher]

From: Jacob Keller <jacob.e.kel...@intel.com>

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.kel...@intel.com>
Tested-by: Aaron Brown <aaron.f.br...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/igb/igb.h         | 1 +
 drivers/net/ethernet/intel/igb/igb_ethtool.c | 1 +
 drivers/net/ethernet/intel/igb/igb_main.c    | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb.h 
b/drivers/net/ethernet/intel/igb/igb.h
index bf9bf9056d0c..be35edcf6b08 100644
--- 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 0efb62db6efd..8730f7cbce68 100644
--- 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 fefa46120cbc..06b81a609fa0 100644
--- 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++;
                }
        }
 
-- 
2.12.2