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i40e: add statistic indicating number of skipped Tx timestamps 

The i40e 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>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jacob Keller 2017-05-03 10:28:58 -07:00 committed by Jeff Kirsher
parent 69077577af
commit 2955faca04
3 changed files with 3 additions and 0 deletions
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1
drivers/net/ethernet/intel/i40e/i40e.h
View File

@ -506,6 +506,7 @@ struct i40e_pf {
struct mutex tmreg_lock; /* Used to protect the SYSTIME registers. */
u64 ptp_base_adj;
u32 tx_hwtstamp_timeouts;
u32 tx_hwtstamp_skipped;
u32 rx_hwtstamp_cleared;
u32 latch_event_flags;
spinlock_t ptp_rx_lock; /* Used to protect Rx timestamp registers. */

1
drivers/net/ethernet/intel/i40e/i40e_ethtool.c
View File

@ -147,6 +147,7 @@ static const struct i40e_stats i40e_gstrings_stats[] = {
I40E_PF_STAT("VF_admin_queue_requests", vf_aq_requests),
I40E_PF_STAT("arq_overflows", arq_overflows),
I40E_PF_STAT("rx_hwtstamp_cleared", rx_hwtstamp_cleared),
I40E_PF_STAT("tx_hwtstamp_skipped", tx_hwtstamp_skipped),
I40E_PF_STAT("fdir_flush_cnt", fd_flush_cnt),
I40E_PF_STAT("fdir_atr_match", stats.fd_atr_match),
I40E_PF_STAT("fdir_atr_tunnel_match", stats.fd_atr_tunnel_match),

1
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -2630,6 +2630,7 @@ static int i40e_tsyn(struct i40e_ring *tx_ring, struct sk_buff *skb,
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
pf->ptp_tx_skb = skb_get(skb);
} else {
pf->tx_hwtstamp_skipped++;
return 0;
}