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ixgbe: add statistic indicating number of skipped Tx timestamps 

The ixgbe 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: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jacob Keller 2017-05-03 10:29:00 -07:00 committed by Jeff Kirsher
parent 5fef124d9c
commit 4cc74c01ef
3 changed files with 16 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/intel/ixgbe/ixgbe.h
View File

@ -733,6 +733,7 @@ struct ixgbe_adapter {
struct timecounter hw_tc; struct timecounter hw_tc;
u32 base_incval; u32 base_incval;
u32 tx_hwtstamp_timeouts; u32 tx_hwtstamp_timeouts;
u32 tx_hwtstamp_skipped;
u32 rx_hwtstamp_cleared; u32 rx_hwtstamp_cleared;
void (*ptp_setup_sdp)(struct ixgbe_adapter *); void (*ptp_setup_sdp)(struct ixgbe_adapter *);

3
drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
View File

@ -111,6 +111,9 @@ static const struct ixgbe_stats ixgbe_gstrings_stats[] = {
{"os2bmc_tx_by_bmc", IXGBE_STAT(stats.b2ospc)}, {"os2bmc_tx_by_bmc", IXGBE_STAT(stats.b2ospc)},
{"os2bmc_tx_by_host", IXGBE_STAT(stats.o2bspc)}, {"os2bmc_tx_by_host", IXGBE_STAT(stats.o2bspc)},
{"os2bmc_rx_by_host", IXGBE_STAT(stats.b2ogprc)}, {"os2bmc_rx_by_host", IXGBE_STAT(stats.b2ogprc)},
{"tx_hwtstamp_timeouts", IXGBE_STAT(tx_hwtstamp_timeouts)},
{"tx_hwtstamp_skipped", IXGBE_STAT(tx_hwtstamp_skipped)},
{"rx_hwtstamp_cleared", IXGBE_STAT(rx_hwtstamp_cleared)},
#ifdef IXGBE_FCOE #ifdef IXGBE_FCOE
{"fcoe_bad_fccrc", IXGBE_STAT(stats.fccrc)}, {"fcoe_bad_fccrc", IXGBE_STAT(stats.fccrc)},
{"rx_fcoe_dropped", IXGBE_STAT(stats.fcoerpdc)}, {"rx_fcoe_dropped", IXGBE_STAT(stats.fcoerpdc)},

21
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -8337,16 +8337,19 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
protocol = vlan_get_protocol(skb); protocol = vlan_get_protocol(skb);
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) && if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
adapter->ptp_clock && adapter->ptp_clock) {
!test_and_set_bit_lock(__IXGBE_PTP_TX_IN_PROGRESS, if (!test_and_set_bit_lock(__IXGBE_PTP_TX_IN_PROGRESS,
&adapter->state)) { &adapter->state)) {
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
tx_flags |= IXGBE_TX_FLAGS_TSTAMP; tx_flags |= IXGBE_TX_FLAGS_TSTAMP;
/* schedule check for Tx timestamp */ /* schedule check for Tx timestamp */
adapter->ptp_tx_skb = skb_get(skb); adapter->ptp_tx_skb = skb_get(skb);
adapter->ptp_tx_start = jiffies; adapter->ptp_tx_start = jiffies;
schedule_work(&adapter->ptp_tx_work); schedule_work(&adapter->ptp_tx_work);
} else {
adapter->tx_hwtstamp_skipped++;
}
} }
skb_tx_timestamp(skb); skb_tx_timestamp(skb);