ice: Don't put stale timestamps in the skb

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The driver has to check if it does not accidentally put the timestamp in
the SKB before previous timestamp gets overwritten.
Timestamp values in the PHY are read only and do not get cleared except
at hardware reset or when a new timestamp value is captured.
The cached_tstamp field is used to detect the case where a new timestamp
has not yet been captured, ensuring that we avoid sending stale
timestamp data to the stack.

Fixes: ea9b847cda ("ice: enable transmit timestamps for E810 devices")
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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Karol Kolacinski 2021-11-16 13:07:14 +01:00 • committed by Tony Nguyen

parent 0013881c11

commit 37e738b6fd

2 changed files with 10 additions and 7 deletions

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11

drivers/net/ethernet/intel/ice/ice_ptp.c

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6

drivers/net/ethernet/intel/ice/ice_ptp.h

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