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e1000e: add statistic indicating number of skipped Tx timestamps 

The e1000e 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 10:28:57 -07:00 committed by Jeff Kirsher
parent 74344e32fc
commit cff5714145
3 changed files with 12 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/intel/e1000e/e1000.h
View File

@ -268,6 +268,7 @@ struct e1000_adapter {
u32 tx_fifo_size;
u32 tx_dma_failed;
u32 tx_hwtstamp_timeouts;
u32 tx_hwtstamp_skipped;
/* Rx */
bool (*clean_rx)(struct e1000_ring *ring, int *work_done,

1
drivers/net/ethernet/intel/e1000e/ethtool.c
View File

@ -105,6 +105,7 @@ static const struct e1000_stats e1000_gstrings_stats[] = {
E1000_STAT("uncorr_ecc_errors", uncorr_errors),
E1000_STAT("corr_ecc_errors", corr_errors),
E1000_STAT("tx_hwtstamp_timeouts", tx_hwtstamp_timeouts),
E1000_STAT("tx_hwtstamp_skipped", tx_hwtstamp_skipped),
};
#define E1000_GLOBAL_STATS_LEN ARRAY_SIZE(e1000_gstrings_stats)

17
drivers/net/ethernet/intel/e1000e/netdev.c
View File

@ -5867,13 +5867,16 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
nr_frags);
if (count) {
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
(adapter->flags & FLAG_HAS_HW_TIMESTAMP) &&
!adapter->tx_hwtstamp_skb) {
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
tx_flags |= E1000_TX_FLAGS_HWTSTAMP;
adapter->tx_hwtstamp_skb = skb_get(skb);
adapter->tx_hwtstamp_start = jiffies;
schedule_work(&adapter->tx_hwtstamp_work);
(adapter->flags & FLAG_HAS_HW_TIMESTAMP)) {
if (!adapter->tx_hwtstamp_skb) {
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
tx_flags |= E1000_TX_FLAGS_HWTSTAMP;
adapter->tx_hwtstamp_skb = skb_get(skb);
adapter->tx_hwtstamp_start = jiffies;
schedule_work(&adapter->tx_hwtstamp_work);
} else {
adapter->tx_hwtstamp_skipped++;
}
}
skb_tx_timestamp(skb);